WO2004079680A1 - Optical fiber fixing device and invader sensing system having the optical fiber fixing device - Google Patents

Optical fiber fixing device and invader sensing system having the optical fiber fixing device Download PDF

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Publication number
WO2004079680A1
WO2004079680A1 PCT/KR2004/000444 KR2004000444W WO2004079680A1 WO 2004079680 A1 WO2004079680 A1 WO 2004079680A1 KR 2004000444 W KR2004000444 W KR 2004000444W WO 2004079680 A1 WO2004079680 A1 WO 2004079680A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
fixing
hole
optical
pressure
Prior art date
Application number
PCT/KR2004/000444
Other languages
French (fr)
Inventor
Kwan-Suk Yang
Original Assignee
Kwan-Suk Yang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kwan-Suk Yang filed Critical Kwan-Suk Yang
Publication of WO2004079680A1 publication Critical patent/WO2004079680A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/018—Control or drive mechanisms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/186—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using light guides, e.g. optical fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G9/00—Bed-pans, urinals or other sanitary devices for bed-ridden persons; Cleaning devices therefor, e.g. combined with toilet-urinals
    • A61G9/02—Cleaning devices

Definitions

  • the present invention relates to an optical fiber fixing device and an invader sensing system having the optical fiber fixing device. More particularly, the present invention relates to an optical fiber fixing device with which an optical fiber net can be easily installed regardless of the size and shape of a security frame of a security system, the installed optical fiber net can be fixed to be cut when someone try to modify or remove the installed optical fiber net, and the tension of the optical fiber net installed can be kept constant and an invader sensing system having the optical fiber fixing device.
  • An invader sensing system using an optical fiber is generally to use the optical fiber as a sensor so as to determine the presence and attempt of invasion. It is installed in guard areas of the military camps, airports, power plants, detention facilities and the like for the purpose of protecting the facilities against invaders.
  • the sensing system is configured by installing frames with a certain shape at the guard areas and then installing an optical fiber net onto the frames.
  • the optical fiber net is used in the form of a net obtained by merely intersecting one or more strands of optical fibers with one another or by twisting one or more stands of the optical fibers.
  • the size and shape of frames may be different depending on the installation environments, there is a problem in that it is difficult to install the optical fiber net.
  • the applicant of the present application has proposed a bolt for use in fixing optical fibers that can be fixedly installed regardless of the size and shape of the installation environments, in Korean Patent Application No. 2001-0002092 (entitled “device for optically sensing invaders for use in windows and doors using nets made of plastic optical fibers”).
  • the fixing bolt comprises a head 18 with a through-hole 14, through which an optical fiber can pass, formed therein and a threaded portion 16 with a predetermined length of thread that can be fixedly installed at a frame with a certain shape.
  • an object of the present invention is to provide an optical fiber fixing device wherein an optical fiber passing through a hole of a fixing bolt can be directly fixed to the fixing bolt such that an optical fiber net under constant tension can be easily manufactured in the field.
  • Another object of the present invention is to provide an optical fiber fixing device which allows an optical fiber net under constant tension to be manufactured in the field, thereby improving security and reliability.
  • a further object of the present invention is to provide an invader sensing system having the optical fiber fixing device.
  • an optical fiber fixing device for an invader sensing system, comprising a fixing bolt including a head which is formed with a through-hole for allowing the optical fiber with a constant diameter to pass therethrough, and a threaded portion which extends from the head and has a constant length of threads formed at an end thereof such that it can be fixed to a frame.
  • the head of the fixing bolt is formed with a fixing hole for allowing the through- hole to communicate with the outside in a direction perpendicular to an axis of the through-hole
  • the device further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole.
  • the fixing hole may be formed on a top surface of the head to communicate with the outside.
  • the diameter of the through-hole may be enlarged at both ends thereof.
  • a female thread is formed on an inner circumferential surface of the fixing hole, and the pressure-fixing means is a pressure-fixing bolt screwed with the female thread of the fixing hole.
  • a female thread is formed on an inner circumferential surface of the fixing hole; and the pressure-fixing means includes a pressure-fixing bolt screwed with the female thread of the fixing hole, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure-fixing bolt and formed with a concave cylindrical surface for accommodating the optical fiber therein.
  • an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole.
  • the pressure-fixing means may be a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof.
  • an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole.
  • the pressure-fixing means may include a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure member and formed with a concave cylindrical surface for accommodating the optical fiber therein.
  • the fixing clip may be formed with a cavity at a central portion thereof for coming into contact with the optical fiber at only both ends thereof.
  • a diameter of the concave cylindrical surface is less than that of the optical fiber.
  • the optical fiber can be sequentially installed under certain tension by inserting the optical fiber into the through-hole of the fixing bolt and then fixing the optical fiber with the pressure-fixing bolt.
  • the optical fiber is winding together with the screws. Therefore, since the optical fiber is cut, the sensing system can detect the invasion.
  • an optical fiber fixing device for an invader sensing system using an optical fiber, which comprises a support which corresponds to a slender member with a predetermined length fixed to a frame and includes a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole, and a pressure member including a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through-hole is pushed down and fixed in the through-hole from the top of the receiving groove.
  • the pressure member takes the shape of a hollow square column with a side removed therefrom, the fixing protrusions are formed to cut out a portion of opposite lateral sides of the pressure member and to protrude outwardly, and a cavity is formed in the middle of the concave cylindrical surface.
  • an invader sensing system using an optical fiber comprising an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a plurality of fixing bolts each of which includes a threaded portion fixedly installed to the frame and a head with a through-hole for the optical fiber to pass through, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion.
  • the head of the fixing bolt is formed with a fixing hole for allowing the through-hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the invader sensing system further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole.
  • an invader sensing system using an optical fiber comprising an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a fixing means for fixing the optical fiber to the frame, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion.
  • the fixing means comprises a support which corresponds to a slender member with a predetermined length fixed to a frame and includes a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole, and a pressure member which includes a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through-hole is pushed down and fixed in the through-hole from the top of the receiving groove.
  • the invader sensing system can detect the invasion because the optical fiber is broken when the invader intends to secure a space for invasion by removing or pulling the optical fiber.
  • Fig. 1 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to an aspect of the present invention.
  • Fig. 2 is a longitudinal sectional view of the optical fiber fixing device shown in Fig. 1.
  • Fig. 3 is a sectional view taken along line A-A of Fig. 2.
  • Fig. 4 is a sectional view of a second embodiment of an optical fiber fixing device according to an aspect of the present invention.
  • Fig. 5 is a sectional view taken along line B-B of Fig. 4.
  • Fig. 6 is an exploded perspective view of a third embodiment of an optical fiber fixing device according to an aspect of the present invention.
  • Fig. 7 is a sectional view taken along line C-C of Fig. 6.
  • FIG. 8 is an exploded perspective view of a fourth embodiment of an optical fiber fixing device according to an aspect of the present invention.
  • Fig. 9 is a sectional view taken along line D-D of Fig. 8.
  • Fig. 10 is a sectional view taken along line E-E of Fig. 8.
  • Fig. 11 is an exploded perspective view of a fifth embodiment of an optical fiber fixing device according to an aspect of the present invention.
  • Fig. 12 is a longitudinal sectional view of the optical fiber fixing device shown in
  • Fig. 13 is a view schematically illustrating the configuration of an invader sensing system having the optical fiber fixing device according to an aspect of the present invention.
  • Fig. 14 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to another aspect of the present invention.
  • Fig. 15 is a view illustrating a use state of the first embodiment of the optical fiber fixing device according to another aspect of the present invention.
  • Fig. 16 is a sectional view taken along line F-F of Fig. 15.
  • Figs. 17 and 18 show a conventional optical fiber fixing device for use in an invader sensing system.
  • Optical fiber net 110 Frame
  • Optical fiber 200 control device
  • Fig. 1 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to an aspect of the present invention
  • Fig. 2 is a longitudinal sectional view of the optical fiber fixing device shown in Fig. 1
  • Fig. 3 is a sectional view taken along line A-A of Fig. 2.
  • Fig. 1 shows a first embodiment of the optical fiber fixing device according to an aspect of the present invention.
  • the optical fiber fixing device of this embodiment comprises a fixing bolt 10 and a pressure-fixing bolt 20.
  • the fixing bolt 10 includes a head 18 having a through-hole 14 through which a constant diameter of optical fibers can pass, and a threaded portion 16 extending from the head 18 and having a constant length of threads formed at an end thereof such that it can be fixed to a frame.
  • a fixing hole 12 for fixing the optical fiber is formed on a top surface of the head 18 of the fixing bolt 10 such that the through-hole 14 communicates with the outside through the hole 12, and the pressure-fixing bolt 20 is fitted into the fixing hole 12 to fix the optical fiber passing through the through-hole under pressure.
  • female and male threads are formed on inner and outer circumferential surfaces of the fixing hole 12 and the pressure-fixing bolt 20, respectively, such that the bolt is screwed into the hole.
  • they may be fixed with each other by using protrusions and grooves, as shown in Fig. 8.
  • a plurality of through-holes 14 can be formed in the head 18.
  • the pressure-fixing bolt 20 with a wrench groove 21 has been employed in this embodiment, a slotted screw or crosshead screw may be used.
  • a recess 30 may be formed on the head 18 of the fixing bolt 10 such that the head of the pressure-fixing bolt 20 does not protrude from the top surface of the head 18 of the fixing bolt 10.
  • the pressure- fixing bolt 20 is inserted into the fixing hole 12 longer than a depth of the hole such that it protrudes slightly into the through-hole 14. Therefore, the pressure-fixing bolt 20 pushes down an upper portion of the optical fiber inserted into the through-hole with a certain pressure so that the optical fiber can be fixed in the hole.
  • Fig. 3 shows a shape of the through-hole formed in the head 18 of the fixing bolt 10.
  • an inner diameter of the through-hole 14 should be larger than an outer diameter of the optical fiber.
  • the optical fiber may be damaged if an outlet of the through-hole is formed to have a sharp 90-degree edge as shown in Fig. 3 (A).
  • Fig. 3 (B) it is preferred that the inner diameter of the through-hole 14 be increased as it goes from the center of the through-hole to opposite ends thereof. That is, it is preferred that the through-hole be expanded from the center thereof to the opposite ends thereof, i.e.
  • Fig. 4 is a sectional view of a second embodiment of an optical fiber fixing device according to an aspect of the present invention
  • Fig. 5 is a sectional view taken along line B-B of Fig. 4.
  • the second embodiment shown in Figs. 4 and 5 is different from the first embodiment in that the fixing hole 12 is formed to communicate with the through- hole 14 at a lateral surface of the head 18 of the fixing bolt 10 rather than at the top surface of the head of the fixing bolt.
  • Fig. 6 is an exploded perspective view of a third embodiment of an optical fiber fixing device according to an aspect of the present invention
  • Fig. 7 is a sectional view of the assembled optical fiber fixing device taken along line C-C of Fig. 6.
  • the third embodiment shown in Figs. 6 and 7 is different from the previous embodiments in that a pressure transfer member is further interposed between the pressure-fixing bolt 20 and the inserted optical fiber such that the optical fiber can be prevented from being damaged due to a bottom end of the threaded portion of the pressure-fixing bolt 20 when rotating the pressure-fixing bolt 20 to fix the optical fiber in the through-hole.
  • a pad with a constant thickness made of rubber, synthetic resin or metal is used as the pressure transfer member 40 such that an outer periphery of the optical fiber can be prevented from being damaged when the optical fiber is fixed with the pressure-fixing bolt 20.
  • the pressure transfer member 40 is a member that is sized to be fitted into the fixing hole 12.
  • a top surface of the pressure transfer member 40 that comes into contact with the pressure-fixing bolt 20 is flat, whereas a bottom surface that receives an applied pressure from the pressure-fixing bolt 20 and comes into pressure contact with the optical fiber is manufactured in the form of a fixing clip 40 in which a concave cylindrical surface with the same diameter as that of the optical fiber is formed such that the optical fiber can be accommodated in the concave cylindrical surface.
  • the fixing clip 40 is configured in such a manner that its top surface can be pushed down by tightening the pressure-fixing bolt 20 and its bottom surface includes the concave cylindrical surface with the same diameter as that of the optical fiber to accommodate the optical fiber. Therefore, the optical fiber can be safely pressed and fixed without damaging the outer periphery of the optical fiber.
  • Fig. 8 is an exploded perspective view of a fourth embodiment of an optical fiber fixing device according to an aspect of the present invention
  • Fig. 9 is a sectional view of the assembled optical fiber fixing device taken along line D-D of Fig. 8
  • Fig. 10 is a sectional view of the assembled optical fiber fixing device taken along line E-E of Fig. 8.
  • This embodiment is different from the third embodiment in that a portion of the bottom surface of the fixing clip 40 that comes into contact with the optical fiber is removed, two legs 42 are formed on opposite sides of the fixing clip 40, respectively, a certain space is defined between the two opposite legs for accommodating the optical fiber, and a circular curved portion 41 with the same diameter as that of the optical fiber is formed at the connection of the two opposite legs between which the optical fiber is accommodated.
  • the fixing clip 40 is configured in such a manner that its legs are in contact with and supported on a bottom floor of the through-hole and the circular curved portion 41 extending between the opposite legs of the fixing clip fixes the optical fiber in the through-hole. More preferably, an interval between the opposite legs is slightly less than the diameter of the optical fiber and the diameter of the circular curved portion is greater than that of the optical fiber such that the legs and circular curved portion of the fixing clip can slightly cut into outer sheathing of the optical fiber so as to securely fix the optical fiber. In this embodiment, it is particularly preferred that a bottom floor of a portion where the fixing hole and the through-hole intersect each other be end-milled to be flat.
  • Fig. 11 is an exploded perspective view of a fifth embodiment of the optical fiber fixing device according to an aspect of the present invention
  • Fig. 12 is a longitudinal section view of the optical fiber fixing device shown in Fig. 11.
  • This embodiment is different from the other embodiments in that an annular groove 52 with a constant depth is formed on an inner circumferential surface of the fixing hole 12 and a cylindrical pressure member 50 with an annular protrusion 51, which will be fitted into the annular groove 52, formed on outer circumferential surface thereof is replaced with the pressure-fixing bolt 20 to fix the optical fiber in the through-hole of the optical fiber fixing device.
  • this embodiment includes the fixing clip 40 similar to the fixing clip illustrated in fourth embodiment, but the fixing clip need not be necessarily provided.
  • the annular protrusion 51 of the pressure member 50 be elastic. If the pressure member 50 is pushed down, the annular protrusion is elastically deformed and then caught into the annular groove. Thereafter, a bottom surface the pressure member pushes down the fixing clip so that the optical fiber can be fixed. As shown in Fig. 12, it is also preferred that the annular groove and protrusion be formed to take the shape of a downwardly inclined saw tooth such that the annular protrusion does not come off from the annular groove. Further, the pressure member can be prevented from being removed by molding a material such as silicone 55 on a top surface of the pressure member after its installation. Fig.
  • the invader sensing system using the optical fiber comprises an optical source 220 for providing a certain optical signal, an optical fiber 120 which is connected with the optical source 220 to receive the optical signal emitted from the optical source and to transmit the received optical signal, the frame 110 of a certain size to which the optical fiber is fixedly installed, a plurality of fixing bolts 10 each of which includes a threaded portion fixedly installed to the frame and a head with a through-hole for the optical fiber formed therein, an optical detector 230 for detecting the optical signal transmitted through the optical fiber, a control unit 210 for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion, and a warning device 300 for issuing an alarm in accordance with an output signal from the control unit.
  • the optical fiber fixing device of the present invention is screwed to the frame 110 in a state where the optical fiber to be fixed is inserted into the through-hole.
  • the optical fiber is first inserted into the through-hole and then pulled to be kept under certain tension.
  • the optical fiber is fixed by pushing down the optical fiber using the pressure-fixing bolt or pressure member.
  • the fixing operation can be made in such a manner that the optical fiber is inserted and fixed into the next fixing bolt while maintaining the proper tension.
  • the optical fiber net 100 can be obtained through the aforementioned fixing operation and various sizes and shapes of the nets may be formed according to the environments where they are installed. That is, the configuration of the optical fiber net can be changed in various manners depending on the shape of the frame 110, the position where the fixing bolt is screwed onto the frame, the sequence that the optical fiber passes through the fixing bolt, or the like.
  • Fig. 14 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to another aspect of the present invention
  • Fig. 15 is a view illustrating a use state of the optical fiber fixing device according the first embodiment shown in Fig. 15,
  • Fig. 16 is a sectional view taken along line F-F of Fig. 15.
  • the optical fiber fixing device of this embodiment comprises a support 70 having a plurality of through-holes 73 through which the optical fiber 120 passes, and a pressure member 40 that is accommodated in the support to fixing the optical fiber 120 to the optical fiber fixing device.
  • the support 70 is a slender member with a certain length and is fixed to the frame 110.
  • the support 70 includes a longitudinal receiving groove 71 with a certain depth and the plurality of through-holes 73 formed in pair at predetermined positions of opposite side walls of the receiving groove such that the optical fiber can pass through the through-hole in a transverse direction of the receiving groove 71. Further, longitudinal fixing grooves 72 with a predetermined depth are formed along opposite inner surfaces of the receiving groove 71 above the through-hole.
  • the pressure member 40 includes a pair of fixing protrusions 43 for allowing the member to be received in the fixing grooves and a concave cylindrical surface having the same diameter as that of the optical fiber for allowing the optical fiber to be accommodated therein.
  • the fixing protrusions are provided on opposite lateral sides of the pressure member and the concave cylindrical surface is formed on a bottom surface of the pressure member which comes into pressure contact with the optical fiber.
  • the fixing protrusions 43 of the pressure member 40 are formed to cut out a portion of the opposite lateral sides of the pressure member and then to protrude outwardly, a pair of legs 42 are formed at each of the opposite lateral sides by removing a portion of the lateral side, and a curved portion 41 for accommodating the optical fiber therein is formed between the pair of legs 42.
  • the diameter of the curved portion 41 is slightly less than the outer diameter of the optical fiber 120 such that the pressure member can slightly cut into the outer sheathing of the optical fiber so as to securely fix the optical fiber.
  • the support 70 is preferably formed to include a pair of wings 74 and a plurality of screw holes 75 formed thereon such that the pressure member can be easily fixed to the frame.
  • the pair of wings 74 are formed at the opposite lateral sides of the pressure member to face the frame. Further, as shown in Fig. 16, a material 55 such as silicone may be applied onto the top of the pressure member in order to prevent the pressure member from being removed or detached from the support. Furthermore, since the fixing protrusions 43 are of an elastic structure, they are elastically deformed and snapped into the fixing grooves 72 when they are pushed into the receiving groove. Thus, the fixing protrusions cannot be easily detached from the fixing grooves.
  • the optical fiber fixing device of this embodiment can be used in a state where it is directly installed to the frame, instead of the optical fiber fixing device using the plurality of fixing bolts 10 shown in Fig. 13. Accordingly, since the optical fiber can be more easily fixed using this optical fiber fixing device, the workability can be improved.
  • an invader sensing system that comprises the optical fiber fixing device using the fixing bolts or the optical fiber fixing device using the support. That is, as shown in Fig. 13, the invader sensing system comprises an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a fixing means for fixing the optical fiber to the frame, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion.
  • the invader sensing system can include either the optical fiber fixing device using the fixing bolts according to an aspect of the present invention or the optical fiber fixing device according to another aspect of the present invention.
  • an optical fiber fixing device for allowing the optical fiber passing through the through-hole of the fixing bolt to directly fixed to the fixing bolt, the optical fiber net can be easily manufactured under predetermined tension in the field.
  • optical fiber net can be fabricated under suitable tension in the field, security and workability can be improved.
  • the invader sensing system having the optical fiber fixing device since the invader sensing system having the optical fiber fixing device is provided, it can be easily fabricated and has improved reliability. It is intended that the embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of the present invention is defined only by the appended claims. Those skilled in the art can make various changes and modifications thereto without departing from its true spirit. Therefore, various changes and modifications obvious to those skilled in the art will fall within the scope of the present invention.

Abstract

The present invention relates to an optical fiber fixing device and an invader sensing system having the optical fiber fixing device. More particularly, the present invention relates to an optical fiber fixing device with which an optical fiber net can be easily installed regardless of the size and shape of a security frame of a security system, the installed optical fiber net can be fixed to be cut when someone try to modify or remove the installed optical fiber net, and the tension of the optical fiber net installed can be kept constant and an invader sensing system having the optical fiber fixing device. The optical fiber fixing device for an invader sensing system using an optical fiber according to the present invention comprises a fixing bolt having a head which is formed with a through-hole for allowing the optical fiber with a constant diameter to pass therethrough, and a threaded portion which extends from the head and includes a constant length of threads formed at an end thereof such that it can be fixed to a frame. More specifically, the head of the fixing bolt is formed with a fixing hole for allowing the through-hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the optical fiber fixing device further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber in the through-hole.

Description

OPTICAL FIBER FIXING DEVICE AND INVADER SENSING SYSTEM HAVING
THE OPTICAL FIBER FIXING DEVICE
Technical field
The present invention relates to an optical fiber fixing device and an invader sensing system having the optical fiber fixing device. More particularly, the present invention relates to an optical fiber fixing device with which an optical fiber net can be easily installed regardless of the size and shape of a security frame of a security system, the installed optical fiber net can be fixed to be cut when someone try to modify or remove the installed optical fiber net, and the tension of the optical fiber net installed can be kept constant and an invader sensing system having the optical fiber fixing device.
Background Art An invader sensing system using an optical fiber is generally to use the optical fiber as a sensor so as to determine the presence and attempt of invasion. It is installed in guard areas of the military camps, airports, power plants, detention facilities and the like for the purpose of protecting the facilities against invaders. The sensing system is configured by installing frames with a certain shape at the guard areas and then installing an optical fiber net onto the frames. The optical fiber net is used in the form of a net obtained by merely intersecting one or more strands of optical fibers with one another or by twisting one or more stands of the optical fibers. However, since the size and shape of frames may be different depending on the installation environments, there is a problem in that it is difficult to install the optical fiber net. In order to solve the aforementioned problem, the applicant of the present application has proposed a bolt for use in fixing optical fibers that can be fixedly installed regardless of the size and shape of the installation environments, in Korean Patent Application No. 2001-0002092 (entitled "device for optically sensing invaders for use in windows and doors using nets made of plastic optical fibers"). As shown in Figs. 17 and 18, the fixing bolt comprises a head 18 with a through-hole 14, through which an optical fiber can pass, formed therein and a threaded portion 16 with a predetermined length of thread that can be fixedly installed at a frame with a certain shape.
However, in a case where the optical fiber net is formed using the optical fiber fixing device proposed in Korean Patent Application No. 2001-0002092, the optical fiber passing through the hole of the fixing bolt cannot be directly fixed to the bolt, and thus, it is difficult to manufacture the optical fiber net under constant tension. Therefore, there are problems in that the workability is not good when the optical fiber is installed in the field arid in that reliability in security is lowered when the optical fiber is loosely installed.
Disclosure of Invention
The present invention is conceived to solve the aforementioned problems. Accordingly, an object of the present invention is to provide an optical fiber fixing device wherein an optical fiber passing through a hole of a fixing bolt can be directly fixed to the fixing bolt such that an optical fiber net under constant tension can be easily manufactured in the field.
Another object of the present invention is to provide an optical fiber fixing device which allows an optical fiber net under constant tension to be manufactured in the field, thereby improving security and reliability.
A further object of the present invention is to provide an invader sensing system having the optical fiber fixing device.
According to an aspect of the present invention, there is provided an optical fiber fixing device for an invader sensing system, comprising a fixing bolt including a head which is formed with a through-hole for allowing the optical fiber with a constant diameter to pass therethrough, and a threaded portion which extends from the head and has a constant length of threads formed at an end thereof such that it can be fixed to a frame. Further, the head of the fixing bolt is formed with a fixing hole for allowing the through- hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the device further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole. Further, the fixing hole may be formed on a top surface of the head to communicate with the outside.
In addition, the diameter of the through-hole may be enlarged at both ends thereof. Preferably, a female thread is formed on an inner circumferential surface of the fixing hole, and the pressure-fixing means is a pressure-fixing bolt screwed with the female thread of the fixing hole.
Preferably, a female thread is formed on an inner circumferential surface of the fixing hole; and the pressure-fixing means includes a pressure-fixing bolt screwed with the female thread of the fixing hole, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure-fixing bolt and formed with a concave cylindrical surface for accommodating the optical fiber therein.
Preferably, an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole. Further, the pressure-fixing means may be a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof. Preferably, an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole. Further, the pressure-fixing means may include a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure member and formed with a concave cylindrical surface for accommodating the optical fiber therein.
Furthermore, the fixing clip may be formed with a cavity at a central portion thereof for coming into contact with the optical fiber at only both ends thereof. Preferably, a diameter of the concave cylindrical surface is less than that of the optical fiber.
According to the present invention, the optical fiber can be sequentially installed under certain tension by inserting the optical fiber into the through-hole of the fixing bolt and then fixing the optical fiber with the pressure-fixing bolt. When loosening the screws of the fixing bolt to remove the optical fiber, the optical fiber is winding together with the screws. Therefore, since the optical fiber is cut, the sensing system can detect the invasion. According to another aspect of the present invention, there is provided an optical fiber fixing device for an invader sensing system using an optical fiber, which comprises a support which corresponds to a slender member with a predetermined length fixed to a frame and includes a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole, and a pressure member including a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through-hole is pushed down and fixed in the through-hole from the top of the receiving groove.
Preferably, the pressure member takes the shape of a hollow square column with a side removed therefrom, the fixing protrusions are formed to cut out a portion of opposite lateral sides of the pressure member and to protrude outwardly, and a cavity is formed in the middle of the concave cylindrical surface.
According to the present invention, the optical fiber can be sequentially installed under proper tension by fixing the support to the frame and then pushing down the optical fiber with the pressure member. According to a further aspect of the present invention, there is provided an invader sensing system using an optical fiber, comprising an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a plurality of fixing bolts each of which includes a threaded portion fixedly installed to the frame and a head with a through-hole for the optical fiber to pass through, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion. Further, the head of the fixing bolt is formed with a fixing hole for allowing the through-hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the invader sensing system further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole.
According to a still further aspect of the present invention, there is provided an invader sensing system using an optical fiber, comprising an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a fixing means for fixing the optical fiber to the frame, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion. In such a case, the fixing means comprises a support which corresponds to a slender member with a predetermined length fixed to a frame and includes a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole, and a pressure member which includes a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through-hole is pushed down and fixed in the through-hole from the top of the receiving groove.
According to the present invention, the invader sensing system can detect the invasion because the optical fiber is broken when the invader intends to secure a space for invasion by removing or pulling the optical fiber.
Brief Description of Drawings
Fig. 1 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to an aspect of the present invention. Fig. 2 is a longitudinal sectional view of the optical fiber fixing device shown in Fig. 1.
Fig. 3 is a sectional view taken along line A-A of Fig. 2.
Fig. 4 is a sectional view of a second embodiment of an optical fiber fixing device according to an aspect of the present invention. Fig. 5 is a sectional view taken along line B-B of Fig. 4.
Fig. 6 is an exploded perspective view of a third embodiment of an optical fiber fixing device according to an aspect of the present invention.
Fig. 7 is a sectional view taken along line C-C of Fig. 6.
FIG. 8 is an exploded perspective view of a fourth embodiment of an optical fiber fixing device according to an aspect of the present invention.
Fig. 9 is a sectional view taken along line D-D of Fig. 8.
Fig. 10 is a sectional view taken along line E-E of Fig. 8.
Fig. 11 is an exploded perspective view of a fifth embodiment of an optical fiber fixing device according to an aspect of the present invention. Fig. 12 is a longitudinal sectional view of the optical fiber fixing device shown in
Fig. 11.
Fig. 13 is a view schematically illustrating the configuration of an invader sensing system having the optical fiber fixing device according to an aspect of the present invention. Fig. 14 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to another aspect of the present invention.
Fig. 15 is a view illustrating a use state of the first embodiment of the optical fiber fixing device according to another aspect of the present invention.
Fig. 16 is a sectional view taken along line F-F of Fig. 15. Figs. 17 and 18 show a conventional optical fiber fixing device for use in an invader sensing system.
<Explanation of reference numerals for designating main components in the drawings>
10 : Fixing bold 12: Fixing hole 14, 73 : Through-hole 16 : Threaded portion 18: Head 20: Pressure-fixing bolt
21: Wrench groove 30: Receiving portion for pressure-fixing bolt
40: Fixing clip 41: Curved portion
42: Leg 45, 71: Receiving portion
50: Pressure member 52: Fixing groove
55: Silicone 70: Support
100: Optical fiber net 110: Frame
120: Optical fiber 200: control device
300: Warning device
Best Mode for Carrying out the Invention
Hereinafter, preferred embodiments of the present invention will be described with reference to accompanying drawings.
Fig. 1 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to an aspect of the present invention, Fig. 2 is a longitudinal sectional view of the optical fiber fixing device shown in Fig. 1, and Fig. 3 is a sectional view taken along line A-A of Fig. 2.
Fig. 1 shows a first embodiment of the optical fiber fixing device according to an aspect of the present invention. As shown in Fig. 1, the optical fiber fixing device of this embodiment comprises a fixing bolt 10 and a pressure-fixing bolt 20. The fixing bolt 10 includes a head 18 having a through-hole 14 through which a constant diameter of optical fibers can pass, and a threaded portion 16 extending from the head 18 and having a constant length of threads formed at an end thereof such that it can be fixed to a frame. A fixing hole 12 for fixing the optical fiber is formed on a top surface of the head 18 of the fixing bolt 10 such that the through-hole 14 communicates with the outside through the hole 12, and the pressure-fixing bolt 20 is fitted into the fixing hole 12 to fix the optical fiber passing through the through-hole under pressure. In this embodiment, female and male threads are formed on inner and outer circumferential surfaces of the fixing hole 12 and the pressure-fixing bolt 20, respectively, such that the bolt is screwed into the hole. However, they may be fixed with each other by using protrusions and grooves, as shown in Fig. 8. A plurality of through-holes 14 can be formed in the head 18. Although the pressure-fixing bolt 20 with a wrench groove 21 has been employed in this embodiment, a slotted screw or crosshead screw may be used.
As shown in Fig. 2 (B), a recess 30 may be formed on the head 18 of the fixing bolt 10 such that the head of the pressure-fixing bolt 20 does not protrude from the top surface of the head 18 of the fixing bolt 10. Further, as shown in Fig. 2, the pressure- fixing bolt 20 is inserted into the fixing hole 12 longer than a depth of the hole such that it protrudes slightly into the through-hole 14. Therefore, the pressure-fixing bolt 20 pushes down an upper portion of the optical fiber inserted into the through-hole with a certain pressure so that the optical fiber can be fixed in the hole. Fig. 3 shows a shape of the through-hole formed in the head 18 of the fixing bolt 10. Since an optical fiber passes through the through-hole 14, an inner diameter of the through-hole 14 should be larger than an outer diameter of the optical fiber. In particular, in a case where the optical fiber should be bent after passing through the through-hole, the optical fiber may be damaged if an outlet of the through-hole is formed to have a sharp 90-degree edge as shown in Fig. 3 (A). As shown in Fig. 3 (B), therefore, it is preferred that the inner diameter of the through-hole 14 be increased as it goes from the center of the through-hole to opposite ends thereof. That is, it is preferred that the through-hole be expanded from the center thereof to the opposite ends thereof, i.e. a < b assuming that the diameter of the through- hole 15 at a position where it communicates with the fixing hole 12 is 'a' and the diameter of the through-hole at the opposite ends thereof is 'b', such that the optical fiber passing through the hole can be flexibly bent.
Fig. 4 is a sectional view of a second embodiment of an optical fiber fixing device according to an aspect of the present invention, and Fig. 5 is a sectional view taken along line B-B of Fig. 4. The second embodiment shown in Figs. 4 and 5 is different from the first embodiment in that the fixing hole 12 is formed to communicate with the through- hole 14 at a lateral surface of the head 18 of the fixing bolt 10 rather than at the top surface of the head of the fixing bolt.
Fig. 6 is an exploded perspective view of a third embodiment of an optical fiber fixing device according to an aspect of the present invention, and Fig. 7 is a sectional view of the assembled optical fiber fixing device taken along line C-C of Fig. 6. The third embodiment shown in Figs. 6 and 7 is different from the previous embodiments in that a pressure transfer member is further interposed between the pressure-fixing bolt 20 and the inserted optical fiber such that the optical fiber can be prevented from being damaged due to a bottom end of the threaded portion of the pressure-fixing bolt 20 when rotating the pressure-fixing bolt 20 to fix the optical fiber in the through-hole. In such a case, a pad with a constant thickness made of rubber, synthetic resin or metal is used as the pressure transfer member 40 such that an outer periphery of the optical fiber can be prevented from being damaged when the optical fiber is fixed with the pressure-fixing bolt 20. The pressure transfer member 40 is a member that is sized to be fitted into the fixing hole 12. Preferably, a top surface of the pressure transfer member 40 that comes into contact with the pressure-fixing bolt 20 is flat, whereas a bottom surface that receives an applied pressure from the pressure-fixing bolt 20 and comes into pressure contact with the optical fiber is manufactured in the form of a fixing clip 40 in which a concave cylindrical surface with the same diameter as that of the optical fiber is formed such that the optical fiber can be accommodated in the concave cylindrical surface. As shown in Fig. 7, the fixing clip 40 is configured in such a manner that its top surface can be pushed down by tightening the pressure-fixing bolt 20 and its bottom surface includes the concave cylindrical surface with the same diameter as that of the optical fiber to accommodate the optical fiber. Therefore, the optical fiber can be safely pressed and fixed without damaging the outer periphery of the optical fiber.
Fig. 8 is an exploded perspective view of a fourth embodiment of an optical fiber fixing device according to an aspect of the present invention, Fig. 9 is a sectional view of the assembled optical fiber fixing device taken along line D-D of Fig. 8, and Fig. 10 is a sectional view of the assembled optical fiber fixing device taken along line E-E of Fig. 8. This embodiment is different from the third embodiment in that a portion of the bottom surface of the fixing clip 40 that comes into contact with the optical fiber is removed, two legs 42 are formed on opposite sides of the fixing clip 40, respectively, a certain space is defined between the two opposite legs for accommodating the optical fiber, and a circular curved portion 41 with the same diameter as that of the optical fiber is formed at the connection of the two opposite legs between which the optical fiber is accommodated. As shown in Figs. 9 and 10, therefore, the fixing clip 40 is configured in such a manner that its legs are in contact with and supported on a bottom floor of the through-hole and the circular curved portion 41 extending between the opposite legs of the fixing clip fixes the optical fiber in the through-hole. More preferably, an interval between the opposite legs is slightly less than the diameter of the optical fiber and the diameter of the circular curved portion is greater than that of the optical fiber such that the legs and circular curved portion of the fixing clip can slightly cut into outer sheathing of the optical fiber so as to securely fix the optical fiber. In this embodiment, it is particularly preferred that a bottom floor of a portion where the fixing hole and the through-hole intersect each other be end-milled to be flat.
Fig. 11 is an exploded perspective view of a fifth embodiment of the optical fiber fixing device according to an aspect of the present invention, and Fig. 12 is a longitudinal section view of the optical fiber fixing device shown in Fig. 11. This embodiment is different from the other embodiments in that an annular groove 52 with a constant depth is formed on an inner circumferential surface of the fixing hole 12 and a cylindrical pressure member 50 with an annular protrusion 51, which will be fitted into the annular groove 52, formed on outer circumferential surface thereof is replaced with the pressure-fixing bolt 20 to fix the optical fiber in the through-hole of the optical fiber fixing device. In particular, this embodiment includes the fixing clip 40 similar to the fixing clip illustrated in fourth embodiment, but the fixing clip need not be necessarily provided. It is preferred that the annular protrusion 51 of the pressure member 50 be elastic. If the pressure member 50 is pushed down, the annular protrusion is elastically deformed and then caught into the annular groove. Thereafter, a bottom surface the pressure member pushes down the fixing clip so that the optical fiber can be fixed. As shown in Fig. 12, it is also preferred that the annular groove and protrusion be formed to take the shape of a downwardly inclined saw tooth such that the annular protrusion does not come off from the annular groove. Further, the pressure member can be prevented from being removed by molding a material such as silicone 55 on a top surface of the pressure member after its installation. Fig. 13 is a view schematically illustrating the configuration of an invader sensing system having the optical fiber fixing device according to an aspect of the present invention. In general, the invader sensing system using the optical fiber comprises an optical source 220 for providing a certain optical signal, an optical fiber 120 which is connected with the optical source 220 to receive the optical signal emitted from the optical source and to transmit the received optical signal, the frame 110 of a certain size to which the optical fiber is fixedly installed, a plurality of fixing bolts 10 each of which includes a threaded portion fixedly installed to the frame and a head with a through-hole for the optical fiber formed therein, an optical detector 230 for detecting the optical signal transmitted through the optical fiber, a control unit 210 for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion, and a warning device 300 for issuing an alarm in accordance with an output signal from the control unit.
As shown in Fig. 13, the optical fiber fixing device of the present invention is screwed to the frame 110 in a state where the optical fiber to be fixed is inserted into the through-hole. When installing the optical fiber to the plurality of through-holes in sequence, the optical fiber is first inserted into the through-hole and then pulled to be kept under certain tension. Finally, the optical fiber is fixed by pushing down the optical fiber using the pressure-fixing bolt or pressure member. Subsequently, the fixing operation can be made in such a manner that the optical fiber is inserted and fixed into the next fixing bolt while maintaining the proper tension. The optical fiber net 100 can be obtained through the aforementioned fixing operation and various sizes and shapes of the nets may be formed according to the environments where they are installed. That is, the configuration of the optical fiber net can be changed in various manners depending on the shape of the frame 110, the position where the fixing bolt is screwed onto the frame, the sequence that the optical fiber passes through the fixing bolt, or the like.
Fig. 14 is an exploded perspective view of a first embodiment of an optical fiber fixing device according to another aspect of the present invention, Fig. 15 is a view illustrating a use state of the optical fiber fixing device according the first embodiment shown in Fig. 15, and Fig. 16 is a sectional view taken along line F-F of Fig. 15. As shown in Fig. 14, the optical fiber fixing device of this embodiment comprises a support 70 having a plurality of through-holes 73 through which the optical fiber 120 passes, and a pressure member 40 that is accommodated in the support to fixing the optical fiber 120 to the optical fiber fixing device. The support 70 is a slender member with a certain length and is fixed to the frame 110. The support 70 includes a longitudinal receiving groove 71 with a certain depth and the plurality of through-holes 73 formed in pair at predetermined positions of opposite side walls of the receiving groove such that the optical fiber can pass through the through-hole in a transverse direction of the receiving groove 71. Further, longitudinal fixing grooves 72 with a predetermined depth are formed along opposite inner surfaces of the receiving groove 71 above the through-hole. To cause the optical fiber inserted in the through-hole 73 to be pushed down and fixed in the through-hole from the top of the receiving groove 71, the pressure member 40 includes a pair of fixing protrusions 43 for allowing the member to be received in the fixing grooves and a concave cylindrical surface having the same diameter as that of the optical fiber for allowing the optical fiber to be accommodated therein. In such a case, the fixing protrusions are provided on opposite lateral sides of the pressure member and the concave cylindrical surface is formed on a bottom surface of the pressure member which comes into pressure contact with the optical fiber. More specifically, the fixing protrusions 43 of the pressure member 40 are formed to cut out a portion of the opposite lateral sides of the pressure member and then to protrude outwardly, a pair of legs 42 are formed at each of the opposite lateral sides by removing a portion of the lateral side, and a curved portion 41 for accommodating the optical fiber therein is formed between the pair of legs 42. The diameter of the curved portion 41 is slightly less than the outer diameter of the optical fiber 120 such that the pressure member can slightly cut into the outer sheathing of the optical fiber so as to securely fix the optical fiber. As shown in Fig. 15, the support 70 is preferably formed to include a pair of wings 74 and a plurality of screw holes 75 formed thereon such that the pressure member can be easily fixed to the frame. The pair of wings 74 are formed at the opposite lateral sides of the pressure member to face the frame. Further, as shown in Fig. 16, a material 55 such as silicone may be applied onto the top of the pressure member in order to prevent the pressure member from being removed or detached from the support. Furthermore, since the fixing protrusions 43 are of an elastic structure, they are elastically deformed and snapped into the fixing grooves 72 when they are pushed into the receiving groove. Thus, the fixing protrusions cannot be easily detached from the fixing grooves. The optical fiber fixing device of this embodiment can be used in a state where it is directly installed to the frame, instead of the optical fiber fixing device using the plurality of fixing bolts 10 shown in Fig. 13. Accordingly, since the optical fiber can be more easily fixed using this optical fiber fixing device, the workability can be improved.
According to a further aspect of the present invention, there is provided an invader sensing system that comprises the optical fiber fixing device using the fixing bolts or the optical fiber fixing device using the support. That is, as shown in Fig. 13, the invader sensing system comprises an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a fixing means for fixing the optical fiber to the frame, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion. The invader sensing system can include either the optical fiber fixing device using the fixing bolts according to an aspect of the present invention or the optical fiber fixing device according to another aspect of the present invention.
Industrial Applicability
According the present invention, since there is provided an optical fiber fixing device for allowing the optical fiber passing through the through-hole of the fixing bolt to directly fixed to the fixing bolt, the optical fiber net can be easily manufactured under predetermined tension in the field.
Further, since the optical fiber net can be fabricated under suitable tension in the field, security and workability can be improved.
Furthermore, since the invader sensing system having the optical fiber fixing device is provided, it can be easily fabricated and has improved reliability. It is intended that the embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of the present invention is defined only by the appended claims. Those skilled in the art can make various changes and modifications thereto without departing from its true spirit. Therefore, various changes and modifications obvious to those skilled in the art will fall within the scope of the present invention.

Claims

1. An optical fiber fixing device for an invader sensing system using an optical fiber, including a fixing bolt having a head and a threaded portion, the head being formed with a through-hole for allowing the optical fiber with a predetermined diameter to pass therethrough, the threaded portion extending from the head and having a predetermined length of threads formed at an end thereof such that it can be fixed to a frame, wherein: the head of the fixing bolt is formed with a fixing hole for allowing the through- hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the device further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole.
2. The device as claimed in claim 1, wherein the fixing hole is formed on a top surface of the head to communicate with the outside.
3. The device as claimed in claim 2, wherein the diameter of the through-hole is enlarged at both ends.
4. The device as claimed in any one of claims 1 to 3, wherein a female thread is formed on an inner circumferential surface of the fixing hole, and the pressure-fixing means is a pressure-fixing bolt screwed with the female thread of the fixing hole.
5. The device as claimed in any one of claims 1 to 3, wherein a female thread is formed on an inner circumferential surface of the fixing hole; and the pressure-fixing means includes a pressure-fixing bolt screwed with the female thread of the fixing hole, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure-fixing bolt and formed with a concave cylindrical surface for accommodating the optical fiber therein.
6. The device as claimed in claim 5, wherein the fixing clip is formed with a cavity at a central portion thereof for coming into contact with the optical fiber at only both ends thereof, and a diameter of the concave cylindrical surface is less than that of the optical fiber.
7. The device as claimed in any one of claims 1 to 3, wherein an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole; and the pressure-fixing means is a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof.
8. The device as claimed in any one of claims 1 to 3, wherein an annular groove with a predetermined depth is formed on an inner circumferential surface of the fixing hole; and the pressure-fixing means includes a cylindrical pressure member with an annular protrusion, which is accommodated in the annular groove, formed at an outer circumferential surface thereof, and a fixing clip inserted into the fixing hole for receiving a pushing force from the pressure member and formed with a concave cylindrical surface for accommodating the optical fiber therein.
9. The device as claimed in claim 8, wherein the fixing clip is formed with a cavity at a central portion thereof for coming into contact with the optical fiber at only both ends thereof, and a diameter of the concave cylindrical surface is less than that of the optical fiber.
10. An optical fiber fixing device for an invader sensing system using an optical fiber, comprising: a support taking the shape of a slender member with a predetermined length fixed to a frame and including a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole; and a pressure member including a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through- hole is pushed down and fixed in the through-hole from the top of the receiving groove.
11. The device as claimed in claim 10, wherein the pressure member takes the shape of a hollow square column with a side removed therefrom, the fixing protrusions are formed to cut out a portion of opposite lateral sides of the pressure member and to protrude outwardly, and a cavity is formed in the middle of the concave cylindrical surface.
12. An invader sensing system using an optical fiber, including an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a plurality of fixing bolts each of which includes a threaded portion fixedly installed to the frame and a head with a through-hole for the optical fiber to pass through, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion, wherein: the head of the fixing bolt is formed with a fixing hole for allowing the through- hole to communicate with the outside in a direction perpendicular to an axis of the through-hole, and the system further comprises a pressure-fixing means inserted into the fixing hole for pushing down and fix the optical fiber passing through the through-hole.
13. An invader sensing system using an optical fiber, including an optical source for providing a certain optical signal, an optical fiber connected with the optical source to receive the optical signal emitted from the optical source and to transmit the received optical signal, a frame with a certain size to which the optical fiber is fixedly installed, a fixing means for fixing the optical fiber to the frame, an optical detector for detecting the optical signal transmitted through the optical fiber, and a control unit for controlling the optical signal from the optical source by computing an output of the optical detector and determining the presence of invasion, wherein the fixing means comprises: a support corresponding to a slender member with a predetermined length fixed to a frame and including a longitudinal receiving groove with a predetermined depth, a plurality of through-holes formed in pair at predetermined positions of opposite side walls of the receiving groove for allowing the optical -fiber to pass through the through-hole in a transverse direction of the receiving groove, and longitudinal fixing grooves with a predetermined depth formed along opposite inner surfaces of the receiving groove above the through-hole; and a pressure member including a pair of fixing protrusions for allowing the member to be received in the fixing grooves and a concave cylindrical surface for allowing the optical fiber to be accommodated therein such that the optical fiber inserted in the through- hole is pushed down and fixed in the through-hole from the top of the receiving groove.
PCT/KR2004/000444 2003-03-03 2004-03-03 Optical fiber fixing device and invader sensing system having the optical fiber fixing device WO2004079680A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017131940A1 (en) * 2016-01-29 2017-08-03 Corning Optical Communications LLC Sensor network and grid-fixing structure for the sensor network

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101059186B1 (en) 2009-05-08 2011-08-25 주식회사 포스컴 Optical cable connection fixing device, optical cable fixing device and security system having same
KR101698834B1 (en) * 2016-08-24 2017-01-23 화이버트론 주식회사 Bending mechanism for intrusion sensing apparatus and intrusion sensing apparatus including the same
KR101698837B1 (en) * 2016-09-05 2017-01-23 화이버트론 주식회사 Intrusion sensing fence system
CN110346889B (en) * 2019-08-12 2024-04-05 中国工程物理研究院激光聚变研究中心 Optical fiber clamp and optical fiber debugging equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367460A (en) * 1979-10-17 1983-01-04 Henri Hodara Intrusion sensor using optic fiber
JPH07298465A (en) * 1994-04-27 1995-11-10 Kyoritsu Denki Seisakusho:Kk Method for securing electric wire
US5774618A (en) * 1996-12-19 1998-06-30 Lucent Technologies Inc. Compact closure for optical fiber cable
JP2000155221A (en) * 1998-11-24 2000-06-06 Fujitsu Ltd Optical fiber cable fixing device
JP2001266968A (en) * 2000-03-24 2001-09-28 Kenwood Corp Screw to tightly fasten wire to terminal board, and terminal board which uses it

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367460A (en) * 1979-10-17 1983-01-04 Henri Hodara Intrusion sensor using optic fiber
JPH07298465A (en) * 1994-04-27 1995-11-10 Kyoritsu Denki Seisakusho:Kk Method for securing electric wire
US5774618A (en) * 1996-12-19 1998-06-30 Lucent Technologies Inc. Compact closure for optical fiber cable
JP2000155221A (en) * 1998-11-24 2000-06-06 Fujitsu Ltd Optical fiber cable fixing device
JP2001266968A (en) * 2000-03-24 2001-09-28 Kenwood Corp Screw to tightly fasten wire to terminal board, and terminal board which uses it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017131940A1 (en) * 2016-01-29 2017-08-03 Corning Optical Communications LLC Sensor network and grid-fixing structure for the sensor network

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