EP1037226A2 - Push switch - Google Patents
Push switch Download PDFInfo
- Publication number
- EP1037226A2 EP1037226A2 EP00105077A EP00105077A EP1037226A2 EP 1037226 A2 EP1037226 A2 EP 1037226A2 EP 00105077 A EP00105077 A EP 00105077A EP 00105077 A EP00105077 A EP 00105077A EP 1037226 A2 EP1037226 A2 EP 1037226A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- movable contact
- stem
- contact
- connecting portion
- housing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
- H01H13/52—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state immediately upon removal of operating force, e.g. bell-push switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2207/00—Connections
- H01H2207/032—Surface mounted component
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/006—Only mechanical function
Abstract
Description
- The present invention relates to a structure of a push switch to be used as an operating switch for various electronic devices. Particularly, the invention is concerned with a structure of a movable contact disposed above fixed terminals which are fixed within a housing.
- As a structure of a movable contact in a conventional push switch there is known such a structure as shown in Figs. 11 and 12. Fig. 11 is a plan view of the movable contact and Fig. 12 is a front view thereof.
- According to the conventional structure shown in those figures, a
movable contact 13 is formed using, for example, a resilient phosphor bronze plate or a stainless steel plate and has a generally circular external shape. A ring-like frame portion 13a is formed outside. Centrally of theframe portion 13a is formed anarcuate hole 13b and centrally of thehole 13b is formed acontact piece 13d one end of which is connected to theframe portion 13a through a connectingportion 13c and an opposite end of which is cut and raised integrally so that a front end side thereof is bent upward at an angle. Thecontact piece 13d is connected rockably to theframe portion 13a through the connectingportion 13c. Thecontact piece 13d is formed planarly in a circular shape and thearcuate hole 13b is formed along thecircular contact piece 13d. Further, outside and along thearcuate hole 13b is formed the ring-like frame portion 13a. - In case of using the
movable contact 13 in a push switch, themovable contact 13 is disposed above fixed terminals fixed to a bottom portion within a housing which is already known, then a rubber spring and a stem (neither shown), which are also known, are mounted to complete a push switch of an existing type. - However, in the above structure of the movable contact in the conventional push switch, the shape of the
contact piece 13d formed in themovable contact 13 is a circular shape having the same size of length and width, so it is required that the size of the circle be determined in proportion to the length of a pair of contact portions formed in the arranged direction of fixed terminals which are arranged opposedly to each other while being spaced a predetermined from each other, with consequent increase in external form of thecontact piece 13d and hence increase in size of themovable contact 13. - Since the
contact piece 13d formed in themovable contact 13 is formed in a planar shape, an abutment portion of the rubber spring which is brought into abutment with themovable contact 13 to bring thecontact piece 13d into contact with the contact portions of the fixed terminals is also formed in a planar shape. Consequently, the rubber spring and the contact piece are affixed to each other, and in operation there occurs a metallic noise caused by engagement and disengagement of the two, thus giving rise to the problem that the operability is poor. - Accordingly, it is an object of the present invention to solve the abovementioned problems and provide a structure of a movable contact permitting its contact piece and connecting portion to be formed long, capable of affording a stable click feeling, capable of reducing the size of the entire movable contact, and capable of preventing the occurrence of a metallic noise at the time of operation together with a rubber spring.
- In order to solve the abovementioned problems, according to the first aspect of the present invention there is provided a push switch comprising a box-shaped housing, a pair of fixed terminals fixed within the housing, a stem held slidably by inner side faces of the housing, a movable contact disposed above the fixed terminals so as to be operable in interlock with movement of the stem, and a rubber spring disposed between the movable contact and the stem, the rubber spring causing the movable contact to move into contact with and away from the fixed terminals in interlock with movement of the stem and causing the stem to return, the movable contact comprising a frame portion formed outside, a connecting portion extending from the frame portion, and a contact piece connected rockably to the frame portion through the connecting portion, the contact piece of the movable contact being formed so that its length in the extending direction of the connecting portion is shorter than its length in a direction perpendicular to the extending direction of the connecting portion.
- According to the second aspect of the present invention there is provided, in combination with the first aspect, a push switch wherein the movable contact is formed using a resilient metallic plate, the frame portion has an arcuate hole formed centrally, and the contact piece is formed centrally of the arcuate hole by being cut and raised integrally on the metallic plate through the connecting portion.
- According to third aspect of the present invention there is provided, in combination with the first or the second aspect, a push switch wherein the contact piece of the movable contact is formed in an elliptic shape.
- According to the fourth aspect of the present invention there is provided, in combination with any of the first to the third aspect, a push switch wherein the contact piece of the movable contact is formed with an abutting protuberance on a side thereof opposed to the rubber spring.
-
- Fig. 1 is a plan view of a push switch according to the first embodiment of the present invention;
- Fig. 2 is a front view thereof;
- Fig. 3 is a sectional view taken on line 3-3 in Fig. 1;
- Fig. 4 is a sectional view taken on line 4-4 in Fig. 1;
- Fig. 5 is an explanatory diagram showing a state in which a stem has been moved from an initial state thereof shown in Fig. 4 to bend a rubber spring;
- Fig. 6 is a plan view of a housing used in the first embodiment;
- Fig. 7 is a plan view of a movable contact used in the first embodiment;
- Fig. 8 is a front view thereof;
- Fig. 9 is a bottom view of the stem used in the first embodiment;
- Fig. 10 is a sectional view taken on line 10-10 in Fig. 9;
- Fig. 11 is a plan view of a movable contact used in a conventional push switch; and
- Fig. 12 is a front view thereof.
-
- A push switch according to an embodiment of the present invention will be described hereunder with reference to Figs. 1 to 10, of which Fig. 1 is a plan view of the push switch, Fig. 2 is a front view thereof, Fig. 3 is a sectional view taken on line 3-3 in Fig. 1, Fig. 4 is a sectional view taken on line 4-4 in Fig. 1, Fig. 5 is an explanatory diagram showing a state in which a stem has been moved from an initial state thereof shown in Fig. 4 to bend a rubber spring, Fig. 6 is a plan view of a housing, Fig. 7 is a plan view of a movable contact, Fig. 8 is a front view thereof, Fig. 9 is a bottom view of the stem, and Fig. 10 is a sectional view taken on line 10-10 in Fig. 9.
- A
housing 1 is formed in the shape of a box having a bottom and an upper opening, using a molding material such as a synthetic resin. In the bottom of thehousing 1 are formedfixed terminals 2 by molding, say, insert molding, integrally with thehousing 1 using an electrically conductive metallic material such as brass. Thefixed terminals 2 are embedded in the bottom of thehousing 1 and are each provided intermediate the embedded portion with abase portion 2b having a plurality ofbent portions 2a, aterminal portion 2c extending outwards of thehousing 1, and acontact portion 2d. Thecontact portions 2d of bothfixed terminals 2 are formed in a pair while being spaced a predetermined distance from each other. The pairedcontact portions 2d are bent and opposed to each other on a line perpendicular to the arranged direction of thebase portion 2b of both fixed terminals. Thecontact portion 2d of each fixed terminal is formed so that the width thereof in a direction perpendicular to the arranged direction of thebase portion 2b is smaller than the width of the base portion. Further, on a line perpendicular to a center line L in the arranged direction of thebase portions 2b of both fixed terminals thecontact portions 2d are opposed to each other while being displaced in opposite directions with the center line L therebetween. By so arranging thecontact portions 2d it becomes possible to shorten the length in the arranged direction of each fixed terminal in thehousing 1. - The
base portions 2b of the fixed terminals are each formed withplural bent portions 2a within thehousing 1, whereby theterminal portions 2c extending outwards of thehousing 1 are formed so as to be flush with a bottom surface of thehousing 1. A front end of eachterminal portion 2c is formed in a J bent shape raised along an outer side face of thehousing 1. Since the front end of eachterminal portion 2c is formed in such a J bent shape, the push switch using thehousing 1 can be surface-mounted onto a circuit board. In this case, the pairedcontact portions 2d are disposed opposedly to each other in a direction in which thebase portions 2b are not distorted by machining of theplural bent portions 2a, that is, on a line perpendicular to the arranged direction of thebase portions 2b. Thus, even withplural bent portions 2a present within thehousing 1, the spacing between the contacts can be set highly accurately without being influenced by variations in machining of thebent portions 2a. Further, it becomes possible to reduce the size of thehousing 1. - In a pair of opposed inner side faces of the
housing 1 are formed retaininggrooves 1a respectively for engagement with retaining projections formed in hook portions of a stem which will be described later. With theretaining grooves 1a, the stem can be guided into thehousing 1 and can be restricted its position during movement and return of the stem as will be described later. Inside the four corners of thehousing 1 which is in a square shape there are formed planar slidingsurface portions 1b so that sliding surface portions of the stem to be described later slide along them. The provision of the slidingsurface portions 1b permits a stable sliding motion of the stem even when a corner portion of the stem is pushed obliquely, whereby the feeling in operation is improved. The shape of each slidingsurface portion 1b formed in thehousing 1 is not limited to a planar shape, but may be an arcuate shape. - A
movable contact 3 is formed using a resilient phosphor bronze plate or stainless steel plate. An external shape thereof is generally circular, with a ring-like frame portion 3a being formed outside and anarcuate hole 3b formed centrally of theframe portion 3a. Further, centrally of thehole 3b is formed acontact piece 3d connected at one end thereof to theframe portion 3a through a connecting portion 3c, an opposite end of thecontact piece 3d being cut and raised integrally. Thecontact piece 3d is connected rockably to theframe portion 3a through the connecting portion 3c and a front end side thereof is bent at a certain angle so as to tilt somewhat upward. Thecontact piece 3d is formed in an elliptic shape so that a major axis of the ellipse is aligned with the arranged direction of thecontact portions 2d of the pairedfixed terminals 2. By forming thecontact piece 3d in an elliptic shape it is possible to make the length (movable span) of the connecting portion 3c large, with the result that the degree of freedom in designing a contact spring load increases, thus affording a stable contact and a stable click feeling. In addition, since thecontact piece 3d can be formed short, it becomes possible to reduce the size of the entiremovable contact 3. - A
protuberance 3e for abutment with a rubber spring to be described later is formed on thecontact piece 3d on the side opposed to the rubber spring, that is, on the raised, inclined, bent, upper side of the contact piece. The number of theprotuberance 3e is not limited to one, but a plurality of such protuberances may be formed. Also as to the shape thereof, it is not limited to one shape. Various shapes of such protuberances may be formed, including arcuate and annular shapes. Since theprotuberance 3e is formed, sticking of the rubber spring to be described later and thecontact piece 3d is prevented and it is possible to prevent the occurrence of a metallic noise caused by engagement and disengagement of the two in operation, whereby the operability is improved. In addition, there is attained a stable state of contact because thecontact piece 3d is pushed at a nearly central part thereof. - A
rubber spring 4 is formed in a dome shape having a lower opening as an external shape using a flexible elastomer or silicone rubber. Therubber spring 4 comprises askirt portion 4a which is bent and is given an elastic force at the time of movement and return of the stem as will be described later and an operatingportion 4b formed above theskirt portion 4a. On a lower surface side of the operatingportion 4b is formed anoperating projection 4c, whose lower end comes into abutment with theprotuberance 3e formed on thecontact piece 3d of themovable contact 3. Although in this embodiment themovable contact 3 is formed using a resilient metallic plate and is disposed between the fixedterminals 2 and therubber spring 4, a known carbon ink contact for example may be formed integrally on the underside of the operatingprojection 4c of therubber spring 4. In this case, themovable contact 3 becomes unnecessary and therefore the number of components is reduced. - A
stem 5 is formed in a generally square shape using a molding material such as a synthetic resin and an upper surface thereof is provided with a planarpressing portion 5a which is operated with a human finger or the like. On a lower surface side opposed to thepressing portion 5a is formed apressing projection 5b projecting downward, whichprojection 5b comes into abutment with an upper surface of the operatingportion 4b of therubber spring 4 to bend therubber spring 4 toward themovable contact 3. A pair of opposed side faces of thestem 5 are formed with a pair ofhook portions 5d having retainingprojections 5c engaged with the retaininggrooves 1a formed in inner side faces of thehousing 1 to restrict the position of thestem 5 within thehousing 1 during movement and return of thestem 5. Inside thehook portions 5d, that is, on the side opposed to theskirt portion 4a of therubber spring 4, are formedrelief portions 5e which are arcuately concaved along the external form of theskirt portion 4a to receivebending portions 4d, the bendingportions 4d being adapted to bend when theskirt portion 4a is pressed. The provision of the relief portions 4e permits the reduction in size of thestem 5. - In the presence of the
relief portions 5e thehook portions 5d are each reduced in the thickness of a central part thereof in its extending direction, that is, in the thickness of eachrelief portion 5e, so that the strength of thehook portions 5d decreases. However, since both side portions are formed thick relative to therelief portions 5e, a sufficient bending strength of the whole of thehook portions 5d is ensured even if therelief portions 5e of thehook portions 5d are formed thin, and it is not necessary to make the whole of eachhook portion 5d large (thick), so it becomes possible to reduce the size of thestem 5. Although in this embodiment therelief portions 5e are each formed in an arcuate shape along the external form of theskirt portion 4a of therubber spring 4, the shape of eachrelief portion 5e is not limited thereto. For example, therelief portions 5e may be each formed in the shape of a square recess capable of receiving the associated bendingportion 4d of theskirt portion 4a. - At the four corners of the square shape of the
stem 5 are providedleg portions 5f extending toward the inside bottom of thehousing 1. Outer corners of theleg portions 5f are chamfered to form planar slidingsurface portions 5g, which are adapted to slide along the slidingsurface portions 1b formed at the four corners of the inner side faces of thehousing 1. The provision of theleg portions 5f at the four corners of thesquare stem 5 is advantageous in that the sliding motion of the outer side faces of thestem 5 relative to the inner side faces of thehousing 1 becomes stable and the sliding motion of thestem 5 within thehousing 1 is ensured. - Moreover, since the sliding
surface portions 5g are formed at outer corners of theleg portions 5f of thestem 5, even when thestem 5 is pushed obliquely at a corner thereof, a sliding motion of the stem is ensured relative to the slidingsurface portions 1b formed at the four corners of the inner side faces of thehousing 1, whereby it becomes possible for thestem 5 to slide in a more stable manner and hence possible to improve the operation feeling of thestem 5. The shape of the slidingsurface portions 5g of thestem 5 is not limited to a planar shape, but it may be an arcuate shape. - In the push switch of the present invention, as set forth above, the movable contact is provided with a frame portion formed outside and a contact piece connected rockably to the frame portion through a connecting portion, the contact piece being formed so that its length in the extending direction of the connecting portion is shorter than its length in a direction perpendicular to the extending direction of the connecting portion. Therefore, the length (movable span) of the connecting portion can be made long, whereby the degree of freedom in designing a contact spring load of the contact piece increases and there is obtained a stable contact and a stable click feeling. Moreover, since the length of the contact piece can be made short, the whole of the movable contact can be formed small in size.
- Moreover, since the movable contact is formed using a resilient metallic plate, an arcuate hole is formed in the frame portion, and the contact piece is formed centrally of the hole by being cut and raised integrally through the connecting portion, it is not required to enlarge the external form of the movable contact, but the movable contact can be formed in a simple shape so as to permit a stable contact.
- Moreover, since the contact piece of the movable contact is formed in an elliptic shape, it is easy to fabricate the mold concerned and there is attained a high machining performance for components. In addition, since the contact piece can be surely brought into contact with the contact portions of a pair of fixed terminals, the contact reliability of the contact portions is improved.
- Further, since the contact piece of the movable contact is formed with an abutting protuberance on its side opposed to the rubber spring, sticking of the rubber spring and the contact piece is prevented and hence it is possible to prevent the occurrence of a metallic noise caused by engagement and disengagement of the two in operation, whereby the operability is improved. Further, since the contact piece is pushed at a nearly central part thereof, there is attained a stable contact.
Claims (4)
- A push switch comprising:a box-shaped housing;a pair of fixed terminals fixed within said housing;a stem held slidably by inner side faces of said housing;a movable contact disposed above said fixed terminals so as to be operable in interlock with movement of said stem; anda rubber spring disposed between said movable contact and said stem, said rubber spring causing the movable contact to move into contact with and away from the fixed terminals in interlock with movement of the stem and causing said stem to return,said movable contact comprising a frame portion formed outside, a connecting portion extending from said frame portion, and a contact piece connected rockably to said frame portion through said connecting portion, said contact piece of said movable contact being formed so that its length in the extending direction of said connecting portion is shorter than its length in a direction perpendicular to the extending direction of the connecting portion.
- The push switch according to claim 1, wherein said movable contact is formed using a resilient metallic plate, said frame portion has an arcuate hole formed centrally, and said contact piece is formed centrally of said arcuate hole by being cut and raised integrally on the metallic plate through said connecting portion.
- The push switch according to claim 1 or 2, wherein said contact piece of said movable contact is formed in an elliptic shape.
- The push switch according to any of claims 1 to 3, wherein said contact piece of said movable contact is formed with an abutting protuberance on a side thereof opposed to said rubber spring.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP06559799A JP3526775B2 (en) | 1999-03-11 | 1999-03-11 | Push switch |
JP6559799 | 1999-03-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1037226A2 true EP1037226A2 (en) | 2000-09-20 |
EP1037226A3 EP1037226A3 (en) | 2001-08-29 |
EP1037226B1 EP1037226B1 (en) | 2005-05-25 |
Family
ID=13291600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00105077A Expired - Lifetime EP1037226B1 (en) | 1999-03-11 | 2000-03-10 | Push switch |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1037226B1 (en) |
JP (1) | JP3526775B2 (en) |
KR (1) | KR100363467B1 (en) |
CN (1) | CN1129157C (en) |
DE (1) | DE60020285T2 (en) |
TW (1) | TW454215B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1294000A3 (en) * | 2001-09-14 | 2005-02-09 | BITRON S.p.A. | An electrical double snap-action lamina switch |
FR2872335A1 (en) * | 2004-06-29 | 2005-12-30 | Dav Sa | ELECTRICAL MICROCONTACTOR FOR CIRCUIT BOARD AND ELECTRIC SWITCH EQUIPPED WITH SUCH A MICROCONTACTOR |
WO2008040132A1 (en) * | 2006-10-03 | 2008-04-10 | Abatek International Ag | Button for smt applications |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101097811B (en) * | 2006-06-26 | 2013-05-08 | 华晶科技股份有限公司 | Metal round cover switch |
KR101291194B1 (en) * | 2007-01-04 | 2013-07-31 | 삼성전자주식회사 | Assembly for key button, and photographing apparatus comprising the same |
JP5199937B2 (en) * | 2009-04-07 | 2013-05-15 | アルプス電気株式会社 | Push button switch |
WO2015140791A1 (en) * | 2014-03-18 | 2015-09-24 | O.M.B. Guitars Ltd. | Floor effect unit |
DE102014019248B4 (en) | 2014-12-19 | 2017-05-11 | Audi Ag | Operating device for a vehicle, in particular a passenger car |
CN109671581B (en) * | 2018-01-03 | 2020-04-10 | 烟台玛格玛电子有限公司 | Metal spring switch for keyboard |
TWI682412B (en) | 2018-11-05 | 2020-01-11 | 緯創資通股份有限公司 | Button module |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1092260A (en) * | 1996-09-17 | 1998-04-10 | Matsushita Electric Ind Co Ltd | Push-on switch |
-
1999
- 1999-03-11 JP JP06559799A patent/JP3526775B2/en not_active Expired - Lifetime
-
2000
- 2000-01-26 TW TW089101329A patent/TW454215B/en not_active IP Right Cessation
- 2000-02-24 KR KR1020000009128A patent/KR100363467B1/en active IP Right Grant
- 2000-03-10 DE DE60020285T patent/DE60020285T2/en not_active Expired - Fee Related
- 2000-03-10 CN CN00102817A patent/CN1129157C/en not_active Expired - Lifetime
- 2000-03-10 EP EP00105077A patent/EP1037226B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1092260A (en) * | 1996-09-17 | 1998-04-10 | Matsushita Electric Ind Co Ltd | Push-on switch |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 09, 31 July 1998 (1998-07-31) & JP 10 092260 A (MATSUSHITA ELECTRIC IND CO LTD), 10 April 1998 (1998-04-10) & US 5 895 901 A 20 April 1999 (1999-04-20) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1294000A3 (en) * | 2001-09-14 | 2005-02-09 | BITRON S.p.A. | An electrical double snap-action lamina switch |
FR2872335A1 (en) * | 2004-06-29 | 2005-12-30 | Dav Sa | ELECTRICAL MICROCONTACTOR FOR CIRCUIT BOARD AND ELECTRIC SWITCH EQUIPPED WITH SUCH A MICROCONTACTOR |
WO2006003051A1 (en) * | 2004-06-29 | 2006-01-12 | Dav | Electric micro-contactor for a circuit card and electric switch comprising one such micro-contactor |
WO2008040132A1 (en) * | 2006-10-03 | 2008-04-10 | Abatek International Ag | Button for smt applications |
US8148657B2 (en) | 2006-10-03 | 2012-04-03 | Abatek International Ag | Key for SMT applications |
CN101523533B (en) * | 2006-10-03 | 2012-10-03 | Aba科技 | Button for smt applications |
KR101392462B1 (en) | 2006-10-03 | 2014-05-07 | 아바텍 인터내셔날 아게 | Button for smt applications |
Also Published As
Publication number | Publication date |
---|---|
EP1037226B1 (en) | 2005-05-25 |
DE60020285D1 (en) | 2005-06-30 |
JP2000260256A (en) | 2000-09-22 |
CN1267071A (en) | 2000-09-20 |
JP3526775B2 (en) | 2004-05-17 |
DE60020285T2 (en) | 2005-11-24 |
KR100363467B1 (en) | 2002-11-30 |
KR20000062624A (en) | 2000-10-25 |
CN1129157C (en) | 2003-11-26 |
EP1037226A3 (en) | 2001-08-29 |
TW454215B (en) | 2001-09-11 |
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