CA1128107A - Color image intensifier - Google Patents
Color image intensifierInfo
- Publication number
- CA1128107A CA1128107A CA333,820A CA333820A CA1128107A CA 1128107 A CA1128107 A CA 1128107A CA 333820 A CA333820 A CA 333820A CA 1128107 A CA1128107 A CA 1128107A
- Authority
- CA
- Canada
- Prior art keywords
- image
- color
- components
- multifiber
- light
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
- H01J31/56—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output for converting or amplifying images in two or more colours
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
- H01J29/892—Optical or photographic arrangements structurally combined or co-operating with the vessel using fibre optics
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
COLOR IMAGE INTENSIFIER
ABSTRACT OF THE DISCLOSURE
Providing full color images in an image intensifier with a fiber optic color filter array which separates "white" light into three primary color components at the input to the intensifier. A correspondingly geo-metrically patterned output filter or colored phosphor pattern affords the full color display. The differently colored components of the input are each subdivided into a multiplicity of smaller elemental components for increased resolution of image detail.
ABSTRACT OF THE DISCLOSURE
Providing full color images in an image intensifier with a fiber optic color filter array which separates "white" light into three primary color components at the input to the intensifier. A correspondingly geo-metrically patterned output filter or colored phosphor pattern affords the full color display. The differently colored components of the input are each subdivided into a multiplicity of smaller elemental components for increased resolution of image detail.
Description
CO~OR IMAGE INTENSJFI~R
~2~07 B~CK R_UND OF THE INVENTION
Field of the Invention:
This invention relates to image intensifiers with particular reference to fiber optic means and method for providing a full color image intensification system.
Discussion of the Prior Art Image intensifiers capable of a high degree of image intensification have been developed for night vision and similar low light level applications but provide only monochromatic images (e.g. green-black as from a P 20 phosphor).
The system disclosed in U. S~ Patents Nos. 3,141,].05;
3,321~658 and 3,436,142 are exemplary.
~~ In photographic view-finding systems, surveillance devices, medical instruments and other apparatuses where color rendition i5 essent:ial, the advantages of image intensification have heretofor been denied.
~ Accordingly, it is an object of the present invention to provide for full color image output in image intensifier devices: and ~nother object is to provide a composite full color image output of high resolution with still higher resolution of image detail in each monochromatic component of the image.
Other objects and advantages of the lnvention will become readily apparent from the fo]lowing description.
~2~07 B~CK R_UND OF THE INVENTION
Field of the Invention:
This invention relates to image intensifiers with particular reference to fiber optic means and method for providing a full color image intensification system.
Discussion of the Prior Art Image intensifiers capable of a high degree of image intensification have been developed for night vision and similar low light level applications but provide only monochromatic images (e.g. green-black as from a P 20 phosphor).
The system disclosed in U. S~ Patents Nos. 3,141,].05;
3,321~658 and 3,436,142 are exemplary.
~~ In photographic view-finding systems, surveillance devices, medical instruments and other apparatuses where color rendition i5 essent:ial, the advantages of image intensification have heretofor been denied.
~ Accordingly, it is an object of the present invention to provide for full color image output in image intensifier devices: and ~nother object is to provide a composite full color image output of high resolution with still higher resolution of image detail in each monochromatic component of the image.
Other objects and advantages of the lnvention will become readily apparent from the fo]lowing description.
- 2 ~ ~9 ,~'--S~ ~RY OE` THE INVENTION
The aforesaid and corollary objectives of the invention are accomplished by providing intensified full color images with a fiber optic color ~ilter array ~hich separates "white" light into three primary color components at the input of an intensifier. A similar color filter at the output of the intensifier affords the full color displa-y. The input and output filters I are identically geometrically patterned for minimizing ¦ distortion. Multi-colored phosphor within the intensifier may be substituted for the output filter.
The filter is formed of juxtapositioned colored fibers (the primary colors) each subdivided into a multiplicity of smaller elemental fibers (e.g. as a multifiber) to provide increased resolution of image detail within each color area.
Details of the invention will become more readily apparent from the ollowing descriptiQn when taken in co~:junction with the accompanyinq drawings.
IN THE DRAWINGS
Fig. 1 is an illustration in cross-section of a preferred embodiment of the invention;
Fig. 2 is a greatly enlarged face view of a cluster of colored multifiber light filtering components, the con-figuration of which is useful in fabricating the color filter plates of the imaqe intensifier illustrated in Fig. l;
Eig. -- is a lragmentary elevati(~ l view of a filter plate formed of lnterfitted clusters of colored multifibers of the type illustrated in Fig. 2;
Fig~ 4 is a cross-sectional view of a modification of the invention;
Fig. 5 is another modification of the invention shown in cross-section; and Fig. 6 is a diagrammatic illustration, in perspective, of a fiberscope system in which an emhodiment of the invention is incorporated for output image intensification ~¦
and color display.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring more particularly to Fig. 1 of the drawings, image intensifier 10, being of the proximity focused type, comprises a pair of spaced image-receiving and image-emitting faceplates 12 and 14 respectively ~ithin envelope 16 which provides an evacuated space 18 for image energy conversion from light-to-electron~
eiergy and back to intensified light for final display.
Face 20 of plate 12 is provided wlth photocathode ~2 and face 24 of plate 14 is provided with light-emitting phosphor coating 26r High electricai voltage is provided across space 18 by DC source 28.
To the extent thus far described, intensifier 10 having faceplates 12 and 14 each constructed of a great multiplicity of fused optical fi~ers 12a and 14a is of conventlonal design requiring no further description.
:~12~
; - - 4 -, Those int~sted in details of image intensifiers o~
this tvpe may, however, refer to U. S. Patents Nos.
The aforesaid and corollary objectives of the invention are accomplished by providing intensified full color images with a fiber optic color ~ilter array ~hich separates "white" light into three primary color components at the input of an intensifier. A similar color filter at the output of the intensifier affords the full color displa-y. The input and output filters I are identically geometrically patterned for minimizing ¦ distortion. Multi-colored phosphor within the intensifier may be substituted for the output filter.
The filter is formed of juxtapositioned colored fibers (the primary colors) each subdivided into a multiplicity of smaller elemental fibers (e.g. as a multifiber) to provide increased resolution of image detail within each color area.
Details of the invention will become more readily apparent from the ollowing descriptiQn when taken in co~:junction with the accompanyinq drawings.
IN THE DRAWINGS
Fig. 1 is an illustration in cross-section of a preferred embodiment of the invention;
Fig. 2 is a greatly enlarged face view of a cluster of colored multifiber light filtering components, the con-figuration of which is useful in fabricating the color filter plates of the imaqe intensifier illustrated in Fig. l;
Eig. -- is a lragmentary elevati(~ l view of a filter plate formed of lnterfitted clusters of colored multifibers of the type illustrated in Fig. 2;
Fig~ 4 is a cross-sectional view of a modification of the invention;
Fig. 5 is another modification of the invention shown in cross-section; and Fig. 6 is a diagrammatic illustration, in perspective, of a fiberscope system in which an emhodiment of the invention is incorporated for output image intensification ~¦
and color display.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring more particularly to Fig. 1 of the drawings, image intensifier 10, being of the proximity focused type, comprises a pair of spaced image-receiving and image-emitting faceplates 12 and 14 respectively ~ithin envelope 16 which provides an evacuated space 18 for image energy conversion from light-to-electron~
eiergy and back to intensified light for final display.
Face 20 of plate 12 is provided wlth photocathode ~2 and face 24 of plate 14 is provided with light-emitting phosphor coating 26r High electricai voltage is provided across space 18 by DC source 28.
To the extent thus far described, intensifier 10 having faceplates 12 and 14 each constructed of a great multiplicity of fused optical fi~ers 12a and 14a is of conventlonal design requiring no further description.
:~12~
; - - 4 -, Those int~sted in details of image intensifiers o~
this tvpe may, however, refer to U. S. Patents Nos.
3,141,105; 3,321,658; and 3,436,142.
In making intensifier 10 adaptable to producing intensified full color renditions of colored images directed thereinto, additional fiber optic faceplates 30 and 32 are provided, preferably but not necessarily, within envelope 16.
Plates 30 and 32, being of identical geometrical patterning and carefully identically aligned along axis 34 of intensifier 10, are each formed of a great number of tightly interfitted and preferably fused, cemented or otherwise connected together multifibers 36 (Figs.
1, 2 and 3)~ iDe. each multifiber 36 consists of a multiplicity of individual tightly juxtapositioned light-conducting fibers 38 (Fiy. 2~.
Multifibers 36 are preferably assenbled in cluste~s of three as illustrated by the triangular T-formation of Fig. 2.
In each triangular cluster of multifibers 36, there is provided one multifiber 3~ formed of colored fibers 38 adapted to transmit substantially only one of the primary colors, i.e. blue, green (or yellow) and red, another multifiber 36 being constructed of fibers 38 adapted to transmit substantially only one other primary color and a third multiliber adapted to transmit substantially only the remaining third primary color.
The letters R, G and B, representing the colors red, gre~n, and hlue, inclicate a colored multlfiber arran~ement which, when asse~blecl into a face~)lat-e structure such as is illustrated in Fig. 2, provides an integration suitable for producing color m~xing (producinq full color images) ~cco~ding to the invention.
~ ibexs 38 ~ay be formed o~ recl, qreen (or yellow) and blue qlasses or 7~1astic materials and inteqrated as ~ultifibers 36 by any well-known technique.
U.S. Patents ~70s. 2,992,516, 3,188,188; 3,119,678 and 3,837,824 illustrate the making of qlass multifibers, for example.
Since the colored fiber groups (multifibers 36) must, for optimum performance, be in a strict 1-1 geometrical corresponden oe at input and output ends of in-tensifier 10, a relatively lar~e multitiber qroup size (e.~. 25-150 micron) is 7~referred. ~lemental fibers 38 for providing ~onochrcmatic images of high resolution within each color dot (multifiber 36) are, however, pre-ferably held to within 5-10 microns in diameter.
A desirab:le proximity focused intensifier (e.g. intensifier 10) maY
ccmprise vacuum tight faceplates 12 and 14 formed of 5-10 micron clear glass fibers, the usual photocathode or photoreceptor, electroluminescent coating 26 (e.g. of "white" light phosphor or zinc su:Lfide activated with copper or manganese) and input and output color plates :30~and 32 as describe~ above.
Ihose interested in details of suitable photocathodes or photore oeptors (i.e.
the preparation, properties and uses of photcemissive materials) may refer to the publication entitled "Photoemissive ~aterials" (pages 113-127) by A.H. So~mer, ished ~Y ~ohn ~iley ~ SQ~S. Inc. of ~7e~7 "ork, l~n~on, ~vdrey, q~ronto.
Other literature on the sibject includes the text of "Electronics for Industry"
(pa~e 17) by W.I. Bendz also published by John Wiley & Sons.
~2~ 7 In Fi~. 6, intensifier 10 is illustrated in use as a color i~aye display device where, for example, an lmage of an object 40 focused on one end 42 of a fiber bundle (fiberscope) 44 and transmitted to emitting and 45 of bundle 44 may be imaged by lens 48 (Figs. 1 and 6) upon receiving face 30 of intensifie- 10 for intensi-fication and full color display at emitting face 32 of the intensifier.
Another application for which intensifiers of the present type may be used is in conjunction with a reflex view finder for motion picture or still cameras.
This would permit blnocular viewing o the view finder image without the usual constraints on head or eye position. Moreover, the image would be bright even with lS the taking lens stopped down ox in low light level photographic conditlons. It has the further advantage of not letting light back thxough the reflex view finder system where such unwanted light might fog the film.
Other applications include low light level surveillance or search systems for which monochromatic image intensifiers have been used, i.e. militar~, police, marine, border patrol, etc. This invention would add a minimum OL
space and cost to the device in such applications.
A modification of the invention is illustrated in Fig. 4 wherein a multi-component (3-color) phosphor layer 50 is substituted for coating 26 of E'ig. 1. By such means, the output multi-color faceplate 32 of Fig.
1 may be elimina-ted. .~11 other parts of intensifier lOa of Fig. 4 heing substantially identical to corre-sponding parts of intensifier 10 of Fig. 10 have been given like reference numerals.
It is required that the geometrical patterning of the multi-color phosphor layer 50 be coordinated to the geometrical structure of input faceplat2 30 similarly to the above-discussed coordination of the faceplate 32 geometry with that of plate 30. To this end, input faceplate 30 may be used to transfer its lntrinsic geometry by copying means (e.g~ photographic methods~
to the phosphor "dot" pattern using photoresist methods to deposit the "dot" pattern. The expression "dot" is meant to be descriptive of a shape corresponding to the cross sectional shape of a multifiber 36 of input plate 30.
~hose interested in photographic-photoresist methods for forming various configurations of phosphor coatings may refer to UO S. Patents Nos~ 3,139,340;
3;255,00~3; and 3,360,450.
The still further modification of the in~ention which is illustrated in E`ig. 5 includes the addition of an electron multiplier channel plate 52 intermediately of photocathode 22 and phosphor coating 26. This is also adaptable to the structure of Figs. 1 and 4 and is energized by potential V2 (Fig. 5~ for increased in-tensification of images produced at the emitting end 54 of intensifier lOb.
Thost~ Interested in the details ~'-f- channel plate electron multipliers may reLer .o U. S. Patents ~os.
3,867,183; 3,979,621; 3,979,637; and 4,031,423.
. ~t should be appreciated that there are various other modifications and/or adaptations Of ~he precise forms of the invention here shown and that the foregoing illustrations are not to be interpreted as restrictive of the invention beyond that necessitated by the following claims.
~Z8~7
In making intensifier 10 adaptable to producing intensified full color renditions of colored images directed thereinto, additional fiber optic faceplates 30 and 32 are provided, preferably but not necessarily, within envelope 16.
Plates 30 and 32, being of identical geometrical patterning and carefully identically aligned along axis 34 of intensifier 10, are each formed of a great number of tightly interfitted and preferably fused, cemented or otherwise connected together multifibers 36 (Figs.
1, 2 and 3)~ iDe. each multifiber 36 consists of a multiplicity of individual tightly juxtapositioned light-conducting fibers 38 (Fiy. 2~.
Multifibers 36 are preferably assenbled in cluste~s of three as illustrated by the triangular T-formation of Fig. 2.
In each triangular cluster of multifibers 36, there is provided one multifiber 3~ formed of colored fibers 38 adapted to transmit substantially only one of the primary colors, i.e. blue, green (or yellow) and red, another multifiber 36 being constructed of fibers 38 adapted to transmit substantially only one other primary color and a third multiliber adapted to transmit substantially only the remaining third primary color.
The letters R, G and B, representing the colors red, gre~n, and hlue, inclicate a colored multlfiber arran~ement which, when asse~blecl into a face~)lat-e structure such as is illustrated in Fig. 2, provides an integration suitable for producing color m~xing (producinq full color images) ~cco~ding to the invention.
~ ibexs 38 ~ay be formed o~ recl, qreen (or yellow) and blue qlasses or 7~1astic materials and inteqrated as ~ultifibers 36 by any well-known technique.
U.S. Patents ~70s. 2,992,516, 3,188,188; 3,119,678 and 3,837,824 illustrate the making of qlass multifibers, for example.
Since the colored fiber groups (multifibers 36) must, for optimum performance, be in a strict 1-1 geometrical corresponden oe at input and output ends of in-tensifier 10, a relatively lar~e multitiber qroup size (e.~. 25-150 micron) is 7~referred. ~lemental fibers 38 for providing ~onochrcmatic images of high resolution within each color dot (multifiber 36) are, however, pre-ferably held to within 5-10 microns in diameter.
A desirab:le proximity focused intensifier (e.g. intensifier 10) maY
ccmprise vacuum tight faceplates 12 and 14 formed of 5-10 micron clear glass fibers, the usual photocathode or photoreceptor, electroluminescent coating 26 (e.g. of "white" light phosphor or zinc su:Lfide activated with copper or manganese) and input and output color plates :30~and 32 as describe~ above.
Ihose interested in details of suitable photocathodes or photore oeptors (i.e.
the preparation, properties and uses of photcemissive materials) may refer to the publication entitled "Photoemissive ~aterials" (pages 113-127) by A.H. So~mer, ished ~Y ~ohn ~iley ~ SQ~S. Inc. of ~7e~7 "ork, l~n~on, ~vdrey, q~ronto.
Other literature on the sibject includes the text of "Electronics for Industry"
(pa~e 17) by W.I. Bendz also published by John Wiley & Sons.
~2~ 7 In Fi~. 6, intensifier 10 is illustrated in use as a color i~aye display device where, for example, an lmage of an object 40 focused on one end 42 of a fiber bundle (fiberscope) 44 and transmitted to emitting and 45 of bundle 44 may be imaged by lens 48 (Figs. 1 and 6) upon receiving face 30 of intensifie- 10 for intensi-fication and full color display at emitting face 32 of the intensifier.
Another application for which intensifiers of the present type may be used is in conjunction with a reflex view finder for motion picture or still cameras.
This would permit blnocular viewing o the view finder image without the usual constraints on head or eye position. Moreover, the image would be bright even with lS the taking lens stopped down ox in low light level photographic conditlons. It has the further advantage of not letting light back thxough the reflex view finder system where such unwanted light might fog the film.
Other applications include low light level surveillance or search systems for which monochromatic image intensifiers have been used, i.e. militar~, police, marine, border patrol, etc. This invention would add a minimum OL
space and cost to the device in such applications.
A modification of the invention is illustrated in Fig. 4 wherein a multi-component (3-color) phosphor layer 50 is substituted for coating 26 of E'ig. 1. By such means, the output multi-color faceplate 32 of Fig.
1 may be elimina-ted. .~11 other parts of intensifier lOa of Fig. 4 heing substantially identical to corre-sponding parts of intensifier 10 of Fig. 10 have been given like reference numerals.
It is required that the geometrical patterning of the multi-color phosphor layer 50 be coordinated to the geometrical structure of input faceplat2 30 similarly to the above-discussed coordination of the faceplate 32 geometry with that of plate 30. To this end, input faceplate 30 may be used to transfer its lntrinsic geometry by copying means (e.g~ photographic methods~
to the phosphor "dot" pattern using photoresist methods to deposit the "dot" pattern. The expression "dot" is meant to be descriptive of a shape corresponding to the cross sectional shape of a multifiber 36 of input plate 30.
~hose interested in photographic-photoresist methods for forming various configurations of phosphor coatings may refer to UO S. Patents Nos~ 3,139,340;
3;255,00~3; and 3,360,450.
The still further modification of the in~ention which is illustrated in E`ig. 5 includes the addition of an electron multiplier channel plate 52 intermediately of photocathode 22 and phosphor coating 26. This is also adaptable to the structure of Figs. 1 and 4 and is energized by potential V2 (Fig. 5~ for increased in-tensification of images produced at the emitting end 54 of intensifier lOb.
Thost~ Interested in the details ~'-f- channel plate electron multipliers may reLer .o U. S. Patents ~os.
3,867,183; 3,979,621; 3,979,637; and 4,031,423.
. ~t should be appreciated that there are various other modifications and/or adaptations Of ~he precise forms of the invention here shown and that the foregoing illustrations are not to be interpreted as restrictive of the invention beyond that necessitated by the following claims.
~Z8~7
Claims (8)
1. An image intensifier including image-receiving and image-emitting optical fiber face plates in spaced aligned relationship with each other, said plates each having oppositely disposed light-receiving and light-emitting faces, the light-emitting face of said image-receiving plate and light-receiving face of said image-emitting plate having adjacency, means for supporting said plates in said adjacency and fox hermetically sealing said space therebetween, a photoreceptor on said light-emitting face of said image-receiving plate, electro-luminescent means on said image-emitting plate, and means for applying an electrical potential across said photoreceptor and electro-luminescent means;
wherein the improvement comprises:
a color filter at said light-receiving face of said image-receiving plate, said filter comprising a multiplicity of juxtapositioned multifiber components each embodying a multiplicity of juxtapositioned elemental optical fibers characterized to be selectively transmissive principally to only one of three of the primary colors of a full color image directed thereupon, said multifiber components of said color filter being arranged in juxtapositioned tightly fitted clusters of three each of said primary colors for uniform color mixing with high resolution of image detail being afforded by said elemental fibers;
and means against said image-emitting plate for reconstructing clusters of colors corresponding to those of said color filter for full color display by said intensifier.
wherein the improvement comprises:
a color filter at said light-receiving face of said image-receiving plate, said filter comprising a multiplicity of juxtapositioned multifiber components each embodying a multiplicity of juxtapositioned elemental optical fibers characterized to be selectively transmissive principally to only one of three of the primary colors of a full color image directed thereupon, said multifiber components of said color filter being arranged in juxtapositioned tightly fitted clusters of three each of said primary colors for uniform color mixing with high resolution of image detail being afforded by said elemental fibers;
and means against said image-emitting plate for reconstructing clusters of colors corresponding to those of said color filter for full color display by said intensifier.
2. An image intensifier according to claim 1 wherein said multifiber components are of a generally square cross-sectional shape and each of said clusters comprises the T-formation of three of said components, each having differently colored elemental fibers.
3. An image intensifier according to claim 1 wherein a cross-sectional dimension of each of said multifiber components is within a range of from ap-proximately 25 to 150 microns and said elemental fibers thereof are of from approximately S to 10 microns in diameter.
4. An image intensifier according to claim 1 wherein said means for reconstructing said clusters of color for full color display comprises a second color filter of substantially identical construction to that of said first mentioned filter, said filters being in accurately aligned relationship for coordination of multifiber geometries.
5. An image intensifier according to claim 4 wherein a cross-sectional dimension of each of said multifiber components is within a range of from approximately 25 to 150 microns and said elemental fibers thereof are of from approximately 5 to 10 microns in diameter.
6. An image intensifier according to claim 1 wherein said means for reconstructing said clusters of color for full color display comprises said electro-luminescent layer being formed of multi-component phosphors, said phosphors being preselected and arranged to exhibit, when activated, a luminescence corresponding in color, geometrical position, shape and size to that of said color filter.
7. An image intensifier according to claim 4 including a multichannel electron multiplier plate intermediately of said photoreceptor and electro-luminescent means.
8. An image intensifier according to claim 5 including a multichannel electron multiplier plate intermediately of said photoreceptor and electro-luminescent means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95822778A | 1978-11-06 | 1978-11-06 | |
| US958,227 | 1978-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128107A true CA1128107A (en) | 1982-07-20 |
Family
ID=25500750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA333,820A Expired CA1128107A (en) | 1978-11-06 | 1979-08-15 | Color image intensifier |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5564354A (en) |
| CA (1) | CA1128107A (en) |
| DE (1) | DE2944284A1 (en) |
| FR (1) | FR2440612A1 (en) |
| GB (1) | GB2034513B (en) |
| HK (1) | HK18385A (en) |
| NL (1) | NL7906803A (en) |
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| US5121030A (en) * | 1989-05-03 | 1992-06-09 | Honeywell Inc. | Absorption filters for chlor display devices |
| US5136153A (en) * | 1989-07-28 | 1992-08-04 | Brother Kogyo Kabushiki Kaisha | Color image forming apparatus having image intensifier unit |
| JPH03112041A (en) * | 1989-09-27 | 1991-05-13 | Hamamatsu Photonics Kk | Color image tube |
| GB2273812B (en) * | 1992-12-24 | 1997-01-08 | Motorola Inc | Image enhancement device |
| IL114181A (en) * | 1995-06-15 | 1999-07-14 | Orlil Ltd | Color image intensifier device and a method for producing the same |
| DE19700262A1 (en) * | 1997-01-07 | 1998-07-16 | Penker Willibald | Image converter for colour image display |
| GB0417259D0 (en) * | 2004-08-03 | 2004-09-01 | Gillon Richard B | The colour night-vision train-window |
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-
1979
- 1979-08-15 CA CA333,820A patent/CA1128107A/en not_active Expired
- 1979-08-28 GB GB7929712A patent/GB2034513B/en not_active Expired
- 1979-09-12 NL NL7906803A patent/NL7906803A/en not_active Application Discontinuation
- 1979-09-13 JP JP11684979A patent/JPS5564354A/en active Pending
- 1979-10-29 FR FR7926721A patent/FR2440612A1/en active Granted
- 1979-11-02 DE DE19792944284 patent/DE2944284A1/en not_active Ceased
-
1985
- 1985-03-14 HK HK18385A patent/HK18385A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB2034513A (en) | 1980-06-04 |
| NL7906803A (en) | 1980-05-08 |
| JPS5564354A (en) | 1980-05-15 |
| DE2944284A1 (en) | 1980-05-14 |
| FR2440612B3 (en) | 1981-08-14 |
| FR2440612A1 (en) | 1980-05-30 |
| GB2034513B (en) | 1983-02-09 |
| HK18385A (en) | 1985-03-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |