CA1069360A - Colour splitting prism assembly - Google Patents
Colour splitting prism assemblyInfo
- Publication number
- CA1069360A CA1069360A CA262,805A CA262805A CA1069360A CA 1069360 A CA1069360 A CA 1069360A CA 262805 A CA262805 A CA 262805A CA 1069360 A CA1069360 A CA 1069360A
- Authority
- CA
- Canada
- Prior art keywords
- prism
- air gap
- prisms
- thermoplastic material
- prism assembly
- 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
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/142—Coating structures, e.g. thin films multilayers
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a colour splitting prism assembly for colour television cameras which splits the incident light in such a camera into a plurality of beams of different spectral compositions intended for the pick-up tubes of the camera. The prism arrangement which ensures splitting is a combination of a plurality of prisms, for example three in number. The positioning of the prisms relative to one another must be done very accurately and furthermore some prisms must be separated from one another by means of a very narrow air gap. To maintain the air gap there is provided along the edges of a prism surface, at said air gap, a small strip of thermoplastic material for maintaining a gap. Optionally, the prism surface can first be coated with a beam splitting layer upon which the thermoplastic material is then fixed. This invention allows for a much more accurate spacing, with less distortion, than known prism assemblies which use wire to maintain the air gap.
This invention relates to a colour splitting prism assembly for colour television cameras which splits the incident light in such a camera into a plurality of beams of different spectral compositions intended for the pick-up tubes of the camera. The prism arrangement which ensures splitting is a combination of a plurality of prisms, for example three in number. The positioning of the prisms relative to one another must be done very accurately and furthermore some prisms must be separated from one another by means of a very narrow air gap. To maintain the air gap there is provided along the edges of a prism surface, at said air gap, a small strip of thermoplastic material for maintaining a gap. Optionally, the prism surface can first be coated with a beam splitting layer upon which the thermoplastic material is then fixed. This invention allows for a much more accurate spacing, with less distortion, than known prism assemblies which use wire to maintain the air gap.
Description
PI I N . ~
LS'rr~J~/Jli~l,M/GVN
12.~.1976 ~0~9360 "Colour splittin~ prism assembly"
The invention relates to a colour splitting - prism assembly for colour television cameras which splits the incident light in such a camera into a plurality of beams of different spectral compositions intended for the pick-up tubes of the camera.
Mostly such a camera comprises three pick-up tubes for the colour components of the different spectral compositions.
The prism arrangement which ensures splitting is a combination of a plurality of prisms, for example three in number.
The positionlng of the prisms relative to one another must be done very accurately and furthermore some prisms - must be separated from one another by means of a very narrow air gap, of, for example, 15 microns.
According to United Kingdom Patent Specification 1,206,461 a.beam splitting prism assembly is proposed for a colour television camera including adjacent prism surfaces, in which the air gaps are adjusted by means of metallic wire which is compressed between said surfaces at the edges, said wire being capable when compressed of distorting and adhering to the surfaces. A suitable metal is indium which is applied in the form of an open ring, the ends of whic~ are overlapped.
In practice this assembly was not very sati~-factory. The glass-to-indium transitions entail annoying reflections.
The assemblies whose strength and resistivity against shoc~s are not very ]arge are on the long run
LS'rr~J~/Jli~l,M/GVN
12.~.1976 ~0~9360 "Colour splittin~ prism assembly"
The invention relates to a colour splitting - prism assembly for colour television cameras which splits the incident light in such a camera into a plurality of beams of different spectral compositions intended for the pick-up tubes of the camera.
Mostly such a camera comprises three pick-up tubes for the colour components of the different spectral compositions.
The prism arrangement which ensures splitting is a combination of a plurality of prisms, for example three in number.
The positionlng of the prisms relative to one another must be done very accurately and furthermore some prisms - must be separated from one another by means of a very narrow air gap, of, for example, 15 microns.
According to United Kingdom Patent Specification 1,206,461 a.beam splitting prism assembly is proposed for a colour television camera including adjacent prism surfaces, in which the air gaps are adjusted by means of metallic wire which is compressed between said surfaces at the edges, said wire being capable when compressed of distorting and adhering to the surfaces. A suitable metal is indium which is applied in the form of an open ring, the ends of whic~ are overlapped.
In practice this assembly was not very sati~-factory. The glass-to-indium transitions entail annoying reflections.
The assemblies whose strength and resistivity against shoc~s are not very ]arge are on the long run
- 2 - ~
~Ot;g3~0 still further affected by atmospheric influences. The minimum spacing of theprisms having such an indium spacer is not less than 30 microns which is rather much in practice.
Finally the method of producing such a composite prism is not simple.
This invention relates to a beam splitting composite prism assembly consisting of a plurality of prisms wherein at least two adjacent prism surfaces are separated by a mutual air gap, characterized in that along the edges of a prism surfaee at said air gap there is provided a small strip of thermoplastic material for maintaining said gap.
In the accompanying drawing which illustrates embodiments of the invention: ~
Figure 1 shows a prism assembly according to the invention; ~i and Figure 2 shows a prism whose surface bounding an air gap is provided with strips according to the invention.
As shown in Figure 1, the prism assembly comprises prism A, B and C separated by at least one air gap, 1 and an interface 2.
ZO Prism C, as shown in more detail in Figure 2 has a surface 3 bounding the air gap 1 which is provided with polyethylene strips S.
The ray paths through the prism assembly are shown in Figure 1. An incident ray i passes through prisms A and B and emerges from prism C as ray r3. Part of the incident ray is reflected at the air C gaps 2 and emerges from prism B as r~ while a portion of the ~ncident ray is reflected at the air gap 1 and emerges from A as r~.--Besides polyethylene terephtalate, polycarbonate or poly-acrylates, which are excellently suitable, the use of polyethylene is pLeferred. There are a number of varieties of polyethylene in which the degree of polymerisation and the branching of the chain differs.
Known are "low density" and "high density" polyethylene which are both suitable.
The excellent bond obtained is also obtained by means of the beam splitting layer or layers which are obtained in the usual manner, which layers consist as a rule of chalcogenides such as ZnS, TiO2 etc.
For adhering the film a continuous strip which is cut in one piece and which has a width of 2 to 3 mm is placed between the glass parts at a temperature of, for example, 150C and the assembly is compressed at a pressure of approximately 15 g/mm . Starting from a 20 microns thick film the spacing between ~he glass parts is approximately 15 microns. The plane parallelism of the relevant surfaces in the assembly is already within a few microns so that a separate spacer can be dispensed with.
A method according to which the beam splitting prism assembly according to the invention may be produced and which will not be further explained herein, is described in applicant's copending Canadian application serial No. 261,870.
The film between the prism elements is transparent. It is advantageous if this film is coloured black in order to further reduce the possibility of undesired reflections.
, ~
"
~Ot;g3~0 still further affected by atmospheric influences. The minimum spacing of theprisms having such an indium spacer is not less than 30 microns which is rather much in practice.
Finally the method of producing such a composite prism is not simple.
This invention relates to a beam splitting composite prism assembly consisting of a plurality of prisms wherein at least two adjacent prism surfaces are separated by a mutual air gap, characterized in that along the edges of a prism surfaee at said air gap there is provided a small strip of thermoplastic material for maintaining said gap.
In the accompanying drawing which illustrates embodiments of the invention: ~
Figure 1 shows a prism assembly according to the invention; ~i and Figure 2 shows a prism whose surface bounding an air gap is provided with strips according to the invention.
As shown in Figure 1, the prism assembly comprises prism A, B and C separated by at least one air gap, 1 and an interface 2.
ZO Prism C, as shown in more detail in Figure 2 has a surface 3 bounding the air gap 1 which is provided with polyethylene strips S.
The ray paths through the prism assembly are shown in Figure 1. An incident ray i passes through prisms A and B and emerges from prism C as ray r3. Part of the incident ray is reflected at the air C gaps 2 and emerges from prism B as r~ while a portion of the ~ncident ray is reflected at the air gap 1 and emerges from A as r~.--Besides polyethylene terephtalate, polycarbonate or poly-acrylates, which are excellently suitable, the use of polyethylene is pLeferred. There are a number of varieties of polyethylene in which the degree of polymerisation and the branching of the chain differs.
Known are "low density" and "high density" polyethylene which are both suitable.
The excellent bond obtained is also obtained by means of the beam splitting layer or layers which are obtained in the usual manner, which layers consist as a rule of chalcogenides such as ZnS, TiO2 etc.
For adhering the film a continuous strip which is cut in one piece and which has a width of 2 to 3 mm is placed between the glass parts at a temperature of, for example, 150C and the assembly is compressed at a pressure of approximately 15 g/mm . Starting from a 20 microns thick film the spacing between ~he glass parts is approximately 15 microns. The plane parallelism of the relevant surfaces in the assembly is already within a few microns so that a separate spacer can be dispensed with.
A method according to which the beam splitting prism assembly according to the invention may be produced and which will not be further explained herein, is described in applicant's copending Canadian application serial No. 261,870.
The film between the prism elements is transparent. It is advantageous if this film is coloured black in order to further reduce the possibility of undesired reflections.
, ~
"
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A beam splitting composite prism assembly consisting of a plurality of prisms wherein at least two adjacent prism surfaces are separated by a mutual air gap, characterized in that along the edges of a prism surface at said air gap there is provided a small strip of thermoplastic material for maintaining said gap.
2. A prism assembly as claimed in claim 1 wherein at least one of said adjacent prism surfaces is coated with a beam splitting layer and said strip of thermoplastic material is fixed on said beam splitting surface.
3. A prism assembly as claimed in claims 1 or 2, characterized in that said thermoplastic material is polyethylene.
4. A prism assembly as claimed in claims 1 or 2, characterized in that the film is coloured black.
5. A prism assembly as claimed in claims 1 or 2, wherein said strip of thermoplastic material has a width of from about 2mm to 3mm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7511838A NL7511838A (en) | 1975-10-09 | 1975-10-09 | COLOR-SEPARATING PRISMA COMBINATION. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069360A true CA1069360A (en) | 1980-01-08 |
Family
ID=19824621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA262,805A Expired CA1069360A (en) | 1975-10-09 | 1976-10-06 | Colour splitting prism assembly |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US4084180A (en) |
| JP (1) | JPS5247320A (en) |
| AU (1) | AU509314B2 (en) |
| CA (1) | CA1069360A (en) |
| CH (1) | CH611040A5 (en) |
| DE (1) | DE2644595C3 (en) |
| FR (1) | FR2339874A1 (en) |
| GB (1) | GB1559286A (en) |
| IT (1) | IT1068585B (en) |
| NL (1) | NL7511838A (en) |
| SE (1) | SE7611080L (en) |
Families Citing this family (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5496323A (en) * | 1978-01-17 | 1979-07-30 | Canon Inc | Television camera |
| JPS58132922A (en) * | 1982-02-01 | 1983-08-08 | Toshiba Corp | Manufacture of semiconductor device |
| JPH0660963B2 (en) * | 1986-09-17 | 1994-08-10 | 松下電器産業株式会社 | Color separation prism |
| US4916529A (en) * | 1986-11-14 | 1990-04-10 | Canon Kabushiki Kaisha | Imaging device utilizing solid-state image sensors combined with a beam-splitting prism |
| NL8802517A (en) * | 1988-10-13 | 1990-05-01 | Philips Nv | IMAGE PROJECTION DEVICE. |
| US5331622A (en) * | 1991-05-28 | 1994-07-19 | Applied Magnetics Corporation | Compact optical head |
| US5646778A (en) * | 1991-05-28 | 1997-07-08 | Discovision Associates | Optical beamsplitter |
| US5155633A (en) * | 1991-07-30 | 1992-10-13 | Applied Magnetics Corporation | Anamorphic achromatic prism for optical disk heads |
| US5325175A (en) * | 1992-05-08 | 1994-06-28 | Honeywell Inc. | Solid-block homodyne interferometer |
| EP0824829B1 (en) * | 1995-05-11 | 2003-02-12 | Digital Projection Limited | Projection device |
| JPH09105806A (en) * | 1995-10-13 | 1997-04-22 | Minolta Co Ltd | Air gap prism and its production |
| US6377409B2 (en) * | 1996-12-04 | 2002-04-23 | Asahi Kogaku Kogyo Kabushiki Kaisha | Prism and viewing optical system using the prism |
| DE69841107D1 (en) * | 1997-07-12 | 2009-10-08 | Roper Ind Inc | MULTISPEKTRAL TWO-DIMENSIONAL IMAGE PROBES SPECTROMETER |
| US6144498A (en) * | 1998-06-11 | 2000-11-07 | Optical Coating Laboratory, Inc. | Color separation prism assembly and method for making same |
| US5982497A (en) * | 1998-07-09 | 1999-11-09 | Optical Insights, Llc | Multi-spectral two-dimensional imaging spectrometer |
| US6512858B2 (en) | 1998-07-21 | 2003-01-28 | Foveon, Inc. | Image scanning circuitry with row and column addressing for use in electronic cameras |
| US6185047B1 (en) | 1999-05-17 | 2001-02-06 | Infocus Corporation | Image projection system packaged to operate lying flat with a very low profile |
| US6215597B1 (en) | 1999-11-17 | 2001-04-10 | Duncan Technologies, Inc. | Apparatus for forming a plurality of subimages having different characteristics |
| US6856466B2 (en) | 2001-07-05 | 2005-02-15 | Science & Engineering Associates, Inc. | Multiple imaging system |
| US6704145B1 (en) | 2002-09-04 | 2004-03-09 | Raytheon Company | Air-gap optical structure having the air gap defined by a layered spacer structure |
| US7505208B1 (en) | 2006-02-06 | 2009-03-17 | Raytheon Company | Air-gap optical structure with a nonreflective air-gap spacer |
| WO2009111642A1 (en) * | 2008-03-05 | 2009-09-11 | Contrast Optical Design & Engineering, Inc. | Multiple image camera and lens system |
| JP5631299B2 (en) | 2008-03-28 | 2014-11-26 | コントラスト オプティカル デザイン アンド エンジニアリング，インク． | Full beam image splitter system |
| JP2011526377A (en) * | 2008-06-27 | 2011-10-06 | パナビジョン・フェデラル・システムズ・リミテッド・ライアビリティ・カンパニー | Wavelength separation beam splitter |
| EP2476021B1 (en) * | 2009-09-10 | 2019-11-20 | Contrast, Inc. | Whole beam image splitting system |
| DE102010060747B4 (en) | 2010-11-23 | 2014-04-03 | Leica Microsystems Cms Gmbh | Confocal laser scanning microscope for examining a sample |
| WO2015050473A1 (en) | 2013-10-03 | 2015-04-09 | Huawei Technologies Co., Ltd | Optical system for combining beams |
| US10257394B2 (en) | 2016-02-12 | 2019-04-09 | Contrast, Inc. | Combined HDR/LDR video streaming |
| US10264196B2 (en) | 2016-02-12 | 2019-04-16 | Contrast, Inc. | Systems and methods for HDR video capture with a mobile device |
| WO2018031441A1 (en) | 2016-08-09 | 2018-02-15 | Contrast, Inc. | Real-time hdr video for vehicle control |
| WO2019014057A1 (en) | 2017-07-10 | 2019-01-17 | Contrast, Inc. | Stereoscopic camera |
| DE102018129832B4 (en) | 2017-12-04 | 2020-08-27 | Leica Microsystems Cms Gmbh | Microscope system and method for microscopic imaging |
| DE102018124129A1 (en) | 2017-12-04 | 2019-06-06 | Leica Microsystems Cms Gmbh | Microscope system and method for microscopic imaging with such a microscope system |
| DE102018129833B4 (en) | 2017-12-04 | 2020-01-02 | Leica Microsystems Cms Gmbh | Microscope system, detection unit for microscope system and method for microscopic imaging of a sample |
| US10951888B2 (en) | 2018-06-04 | 2021-03-16 | Contrast, Inc. | Compressed high dynamic range video |
| US11454875B2 (en) | 2019-11-27 | 2022-09-27 | Texas Instruments Incorporated | Prism architecture |
| DE102020120198B4 (en) | 2020-07-30 | 2022-07-14 | Leica Microsystems Cms Gmbh | Method for assembling a detection arrangement for a microscope system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1206461A (en) * | 1967-01-10 | 1970-09-23 | Electrical & Musical Ind Ltd | Improvements relating to beam splitting arrangements for colour television cameras |
| US3704934A (en) * | 1971-08-16 | 1972-12-05 | Union Carbide Corp | Laser polarizing beam splitter |
-
1975
- 1975-10-09 NL NL7511838A patent/NL7511838A/en not_active Application Discontinuation
-
1976
- 1976-10-02 DE DE2644595A patent/DE2644595C3/en not_active Expired
- 1976-10-06 CA CA262,805A patent/CA1069360A/en not_active Expired
- 1976-10-06 CH CH1264476A patent/CH611040A5/xx not_active IP Right Cessation
- 1976-10-06 IT IT28063/76A patent/IT1068585B/en active
- 1976-10-06 GB GB41505/76A patent/GB1559286A/en not_active Expired
- 1976-10-06 SE SE7611080A patent/SE7611080L/en unknown
- 1976-10-06 JP JP51119472A patent/JPS5247320A/en active Pending
- 1976-10-07 US US05/730,164 patent/US4084180A/en not_active Expired - Lifetime
- 1976-10-08 AU AU18517/76A patent/AU509314B2/en not_active Expired
- 1976-10-08 FR FR7630274A patent/FR2339874A1/en active Granted
-
1979
- 1979-09-24 US US06/078,617 patent/USRE30513E/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2339874B1 (en) | 1982-09-10 |
| JPS5247320A (en) | 1977-04-15 |
| GB1559286A (en) | 1980-01-16 |
| SE7611080L (en) | 1977-04-10 |
| DE2644595A1 (en) | 1977-04-14 |
| US4084180A (en) | 1978-04-11 |
| CH611040A5 (en) | 1979-05-15 |
| AU1851776A (en) | 1978-04-13 |
| FR2339874A1 (en) | 1977-08-26 |
| AU509314B2 (en) | 1980-05-08 |
| IT1068585B (en) | 1985-03-21 |
| DE2644595B2 (en) | 1978-04-20 |
| USRE30513E (en) | 1981-02-10 |
| NL7511838A (en) | 1977-04-13 |
| DE2644595C3 (en) | 1979-01-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |