DE3721751A1 - Optoelectronic filter preferably for video cameras - Google Patents

Optoelectronic filter preferably for video cameras

Info

Publication number
DE3721751A1
DE3721751A1 DE19873721751 DE3721751A DE3721751A1 DE 3721751 A1 DE3721751 A1 DE 3721751A1 DE 19873721751 DE19873721751 DE 19873721751 DE 3721751 A DE3721751 A DE 3721751A DE 3721751 A1 DE3721751 A1 DE 3721751A1
Authority
DE
Germany
Prior art keywords
light
filter
video cameras
optoelectronic filter
optoelectronic
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.)
Withdrawn
Application number
DE19873721751
Other languages
German (de)
Inventor
Uwe Reisacher
Franz Kessler
Siegfried Kraus
Bernd Weinlein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EPS ELEKTRONIK
Original Assignee
EPS ELEKTRONIK
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 EPS ELEKTRONIK filed Critical EPS ELEKTRONIK
Priority to DE19873721751 priority Critical patent/DE3721751A1/en
Publication of DE3721751A1 publication Critical patent/DE3721751A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements

Abstract

In order to enable light attenuation to be switched on and off in the case of optical filters, the optoelectronic filter is assembled from a plurality of optical filters in conjunction with LCD panels, and thus permits light attenuation to be electrically switched. The field of application is the observation of operations (processes) where light conditions are extreme (e.g. welding) and where light conditions are normal (daylight), using such an optoelectronic filter and a video camera.

Description

Die Erfindung betrifft ein optoelektronisches Filter vorzugs­ weise für Videokameras nach dem Oberbegriff des Anspruchs 1.The invention relates to an optoelectronic filter preferred as for video cameras according to the preamble of claim 1.

Die elektrisch schaltbare Lichtschwächung soll einer Video­ kamera ermöglichen, einerseits das extrem starke Licht eines Schweißlichtbogens und andererseits normales Tageslicht bzw. Kunstlicht zu verarbeiten. Das Filter muß dabei Informationen vom Schmelzbad und den Randbereichen sowie auch von der fertigen Schweißnaht (abgeschalteter Licht­ bogen) zulassen.The electrically switchable light attenuation is said to be a video enable camera, on the one hand, the extremely strong light a welding arc and on the other hand normal daylight or to process artificial light. The filter must be there Information from the weld pool and the peripheral areas as well also from the finished weld seam (switched off light bow).

Es ist bekannt zur Erfüllung dieser Erfordernisse Glasfilter an der Optik der Videokamera anzuordnen (Athermal-Gläser bei DESAG Grünenplan, Postfach 80, 3223 Delligsen 2 oder optische Gläser bei Spindler & Hoyer, Königsallee 23, 3400 Göttingen).It is known to meet these glass filter requirements to be arranged on the optics of the video camera (athermal glasses at DESAG Grünenplan, PO Box 80, 3223 Delligsen 2 or optical glasses at Spindler & Hoyer, Königsallee 23, 3400 Göttingen).

Durch eine motorische Schwenkbewegung können diese Filter nun ein- bzw. ausgeschwenkt werden.With a motorized swivel movement, these filters can now be swung in or out.

Dabei ist es allerdings notwendig Platz für die mechanischen Schwenkteile zu schaffen, welche einem ständigen Verschleiß unterliegen und somit die Zuverlässigkeit und Langlebigkeit einer solchen Filtereinrichtung absinken lassen.However, this requires space for the mechanical ones To create swivel parts which are subject to constant wear subject to reliability and longevity let such a filter device sink.

Der Erfindung liegt die Aufgabe zugrunde den Platzbedarf wesentlich zu verringern und die Zuverlässigkeit sowie die Lebensdauer zu erhöhen.The invention has for its object the space requirement significantly reduce and reliability as well to increase the lifespan.

Diese Aufgabe wird durch das optoelektronische Filter vor­ zugsweise für Videokameras durch die kennzeichnenden Merk­ male des Anspruchs 1, 2 und 3 gelöst. This task is accomplished through the optoelectronic filter preferably for video cameras through the characteristic note male of claim 1, 2 and 3 solved.  

Die Kombination von optischen Filtern mit einem oder mehreren LCD-Feldern ermöglicht dabei eine Lichtschwächung. Die Höhe der Lichtschwächung ist von der Anzahl und der Güte der verwendeten optischen Filter in Verbindung mit LCD-Feldern abhängig und wird individuell für den Anwendungs­ fall zusammengestellt. Das Anlegen eines elektrischen Signals ermöglicht das Ein- und Ausschalten der Lichtschwächung.The combination of optical filters with one or more LCD fields enable a weakening of light. The level of light attenuation depends on the number and the Quality of the optical filters used in connection with LCD fields dependent and becomes individual for the application case compiled. The creation of an electric Signals allows you to switch the on and off Attenuation of light.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben:An embodiment is shown in the drawing and is described in more detail below:

Das auftretende Licht gelangt zunächst durch das Filter A, welches den langwelligen Lichtanteil (Infrarotbereich) abhält. Das verbleibende Licht wird nun von Polfilter 1 vertikal linear polarisiert. Das LCD-Feld 1 bewirkt nun eine Drehung des polarisierten Lichtes um 90 Grad oder 270 Grad (je nach LCD-Ausführung). Dieses jetzt horizontal polarisierte Licht gelangt durch das Polfilter 2, welches ebenfalls linear horizontal polarisiert. Das LCD-Feld 2 dreht dieses horizontal polarisierte Licht jetzt wiederum um 90 Grad oder 270 Grad. Dieses jetzt vertikal polarisierte Licht kann nun nach dem vertikal linear polarisierenden Polfilter 3 aus dem gesamten optoelektronischen Filter austreten.The light that occurs first passes through filter A , which blocks the long-wave light component (infrared range). The remaining light is now linearly polarized vertically by polarizing filter 1 . The LCD field 1 now causes the polarized light to rotate by 90 degrees or 270 degrees (depending on the LCD version). This now horizontally polarized light passes through the polarizing filter 2 , which also linearly polarizes horizontally. The LCD panel 2 now rotates this horizontally polarized light again by 90 degrees or 270 degrees. This now vertically polarized light can now emerge from the entire optoelectronic filter after the vertically linearly polarizing polarizing filter 3 .

Durch Anlegen eines elektrischen Signals (Wechselspannung 12 VSS, 50 Hz bis 300 Hz) an die LCD-Felder wird nun die Poldrehung um 90 Grad bzw. 270 Grad aufgehoben.By applying an electrical signal (AC voltage 12 VSS, 50 Hz to 300 Hz) to the LCD fields Pole rotation canceled by 90 degrees or 270 degrees.

Dadurch sind die Polfilter 1 und 2 und die Polfilter 2 und 3 in Dunkelstellung wirksam. Das auftreffende Licht wird durch diesen Effekt stark geschwächt. Durch ein weiteres LCD-Feld B und einen weiteren Polfilter C kann diese Lichtschwächung noch erhöht, oder durch Weglassen von LCD-Feld 2 und Polfilter 3 erniedrigt werden. As a result, the polarizing filters 1 and 2 and the polarizing filters 2 and 3 are effective in the dark position. The incident light is greatly weakened by this effect. This light attenuation can be increased further by a further LCD panel B and a further polarizing filter C , or reduced by omitting the LCD panel 2 and polarizing filter 3 .

Die einzelnen Filterscheiben können miteinander verklebt oder in einen Rahmen eingebaut werden und bilden so eine Einheit.The individual filter disks can be glued together or be built into a frame and thus form one unity.

Die Formgebung und Größe der einzelnen Filter kann individuell nach Anwendungsfall festgelegt werden. Die elektrische Kontaktierung erfolgt über Federkontakte, Löten oder Leitklebstoff.The shape and size of each filter can can be determined individually according to the application. The electrical contact is made via spring contacts, Soldering or conductive adhesive.

Claims (3)

1. Optoelektronisches Filter vorzugsweise für Videokameras mit elektrisch schaltbarer Lichtschwächung, insbesondere zur Beobachtung von Vorgängen unter extremen Lichtverhält­ nissen wie bei Schweiß-, Schneid-, Schleif- und Schmelz­ vorgängen, dadurch gekennzeichnet, daß das gesamte Filter aus einer bestimmten Kombination von mehreren optischen Filtern mit einem oder mehreren LCD-Feldern aufgebaut ist.1. Optoelectronic filter preferably for video cameras with electrically switchable light attenuation, especially for observing processes under extreme light conditions such as welding, cutting, grinding and melting processes, characterized in that the entire filter from a certain combination of several optical filters is constructed with one or more LCD fields. 2. Optoelektronisches Filter vorzugsweise für Videokameras nach Anspruchs 1, dadurch gekennzeichnet, daß die Anzahl und die Güte von optischen Filtern in Verbindung mit LCD-Feldern einen Einfluß auf die Höhe der Lichtschwächung hat.2. Optoelectronic filter, preferably for video cameras according to claim 1, characterized in that the number and quality of optical filters in connection with LCD fields Has an impact on the level of light attenuation. 3. Optoelektronisches Filter vorzugsweise für Videokameras nach Anspruch 1, dadurch gekennzeichnet, daß die Lichtschwächung des gesamten Filters durch Anlegen eines elektrischen Signals an die LCD-Felder ein- bzw. ausgeschaltet wird, wobei zusätzlich durch einzelnes Zuschalten der LCD-Felder eine Stufung der Lichtschwächung erreicht werden kann.3. Optoelectronic filter, preferably for video cameras according to claim 1, characterized in that the light attenuation of the entire Filters by applying an electrical signal to the LCD fields is switched on or off, whereby additionally one step by switching on the LCD fields the weakening of light can be achieved.
DE19873721751 1987-07-01 1987-07-01 Optoelectronic filter preferably for video cameras Withdrawn DE3721751A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873721751 DE3721751A1 (en) 1987-07-01 1987-07-01 Optoelectronic filter preferably for video cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873721751 DE3721751A1 (en) 1987-07-01 1987-07-01 Optoelectronic filter preferably for video cameras

Publications (1)

Publication Number Publication Date
DE3721751A1 true DE3721751A1 (en) 1989-01-12

Family

ID=6330690

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873721751 Withdrawn DE3721751A1 (en) 1987-07-01 1987-07-01 Optoelectronic filter preferably for video cameras

Country Status (1)

Country Link
DE (1) DE3721751A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4305807A1 (en) * 1993-02-25 1994-10-13 Thomson Brandt Gmbh Camera with a controllable diaphragm
DE4420637A1 (en) * 1994-06-14 1995-12-21 Bertram Dr Rapp Optical imaging apparatus for photographic or video camera
DE19616323A1 (en) * 1996-04-24 1997-10-30 Deutsche Telekom Ag Device for local attenuation of light intensity
USRE36654E (en) 1989-03-28 2000-04-11 In Focus Systems, Inc. Stacked LCD color display
US6636278B1 (en) 1998-04-06 2003-10-21 Deutsche Telekom Ag Device for the local attenuation of the light intensity in the field of vision of a light-sensitive monitoring device
DE102006060604A1 (en) * 2006-12-21 2008-06-26 Leopold Kostal Gmbh & Co. Kg Photoelectric sensor device
US8026998B2 (en) 2005-05-20 2011-09-27 Institut Josef Stefan Variable contrast, wide viewing angle liquid crystal light attenuation filter
US8542334B2 (en) 2005-05-20 2013-09-24 Institut Jozef Stefan Variable contrast, wide viewing angle LCD light-switching filter

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182125A (en) * 1960-09-20 1965-05-04 Bendix Corp Illumination control system for television pickup tubes and the like
DE2143120A1 (en) * 1971-08-28 1973-03-08 Bosch Fernsehanlagen TELEVISION CAMERA
DE2415321A1 (en) * 1973-06-27 1975-01-23 Xerox Corp COLOR DISPLAY DEVICE BASED ON LIQUID CRYSTALS AND A PROCESS FOR CREATING COLOR DISPLAY
US3890628A (en) * 1973-10-23 1975-06-17 Motorola Inc Liquid crystal light control device and circuit
DE2553976A1 (en) * 1974-12-02 1976-06-16 Hermann Budmiger LIGHT PROTECTION FILTER
DE2710689A1 (en) * 1976-03-15 1977-09-22 Bassani Spa Light blocking system for TV camera - has liq. crystal layer between two polarisers
US4202014A (en) * 1978-07-13 1980-05-06 Sperry Corporation Pulse modulated automatic light control
US4218120A (en) * 1978-01-17 1980-08-19 Minolta Camera Kabushiki Kaisha Electrochromic light regulator
DE3048024A1 (en) * 1979-12-20 1981-10-08 Sharp K.K., Osaka "LIQUID CRYSTAL DISPLAY DEVICE WITH TWISTED NEMATIC LIQUID CRYSTAL FILLING"
US4408838A (en) * 1979-03-14 1983-10-11 Neal Factor System for the regulation of light for a sequential picture apparatus
US4416514A (en) * 1980-11-10 1983-11-22 Polaroid Corporation Color filter
DE3306162C2 (en) * 1982-02-22 1985-10-10 Nippon Kogaku K.K., Tokio/Tokyo Image capture device
EP0182639A2 (en) * 1984-11-19 1986-05-28 Tektronix, Inc. Optical filter having variable transmission characteristics

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182125A (en) * 1960-09-20 1965-05-04 Bendix Corp Illumination control system for television pickup tubes and the like
DE2143120A1 (en) * 1971-08-28 1973-03-08 Bosch Fernsehanlagen TELEVISION CAMERA
DE2143120B2 (en) * 1971-08-28 1973-06-28 Robert Bosch Fernsehanlagen Gmbh, 6100 Darmstadt TELEVISION CAMERA
DE2415321A1 (en) * 1973-06-27 1975-01-23 Xerox Corp COLOR DISPLAY DEVICE BASED ON LIQUID CRYSTALS AND A PROCESS FOR CREATING COLOR DISPLAY
US3890628A (en) * 1973-10-23 1975-06-17 Motorola Inc Liquid crystal light control device and circuit
DE2553976A1 (en) * 1974-12-02 1976-06-16 Hermann Budmiger LIGHT PROTECTION FILTER
DE2710689A1 (en) * 1976-03-15 1977-09-22 Bassani Spa Light blocking system for TV camera - has liq. crystal layer between two polarisers
US4218120A (en) * 1978-01-17 1980-08-19 Minolta Camera Kabushiki Kaisha Electrochromic light regulator
US4202014A (en) * 1978-07-13 1980-05-06 Sperry Corporation Pulse modulated automatic light control
US4408838A (en) * 1979-03-14 1983-10-11 Neal Factor System for the regulation of light for a sequential picture apparatus
DE3048024A1 (en) * 1979-12-20 1981-10-08 Sharp K.K., Osaka "LIQUID CRYSTAL DISPLAY DEVICE WITH TWISTED NEMATIC LIQUID CRYSTAL FILLING"
US4416514A (en) * 1980-11-10 1983-11-22 Polaroid Corporation Color filter
DE3306162C2 (en) * 1982-02-22 1985-10-10 Nippon Kogaku K.K., Tokio/Tokyo Image capture device
EP0182639A2 (en) * 1984-11-19 1986-05-28 Tektronix, Inc. Optical filter having variable transmission characteristics

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE36654E (en) 1989-03-28 2000-04-11 In Focus Systems, Inc. Stacked LCD color display
DE4305807A1 (en) * 1993-02-25 1994-10-13 Thomson Brandt Gmbh Camera with a controllable diaphragm
DE4420637A1 (en) * 1994-06-14 1995-12-21 Bertram Dr Rapp Optical imaging apparatus for photographic or video camera
DE19616323A1 (en) * 1996-04-24 1997-10-30 Deutsche Telekom Ag Device for local attenuation of light intensity
US6031588A (en) * 1996-04-24 2000-02-29 Deutsche Telekom Ag Ferroelectric liquid crystal device for local reduction of light intensity in the visual field
US6636278B1 (en) 1998-04-06 2003-10-21 Deutsche Telekom Ag Device for the local attenuation of the light intensity in the field of vision of a light-sensitive monitoring device
US8026998B2 (en) 2005-05-20 2011-09-27 Institut Josef Stefan Variable contrast, wide viewing angle liquid crystal light attenuation filter
US8542334B2 (en) 2005-05-20 2013-09-24 Institut Jozef Stefan Variable contrast, wide viewing angle LCD light-switching filter
DE102006060604A1 (en) * 2006-12-21 2008-06-26 Leopold Kostal Gmbh & Co. Kg Photoelectric sensor device

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