USRE30513E - Color splitting prism assembly - Google Patents

Color splitting prism assembly Download PDF

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Publication number
USRE30513E
USRE30513E US06/078,617 US7861779A USRE30513E US RE30513 E USRE30513 E US RE30513E US 7861779 A US7861779 A US 7861779A US RE30513 E USRE30513 E US RE30513E
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US
United States
Prior art keywords
prism
iaddend
iadd
prism assembly
air
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 - Lifetime
Application number
US06/078,617
Inventor
Adrianus A. J. Bleukens, deceased
administrator by Friedrich J. De Haan
Jacobus Stoffels
Petrus J. M. Peters
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US Philips Corp
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US Philips Corp
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Publication date
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Publication of USRE30513E publication Critical patent/USRE30513E/en
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    • 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

Definitions

  • 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.
  • Such a camera comprises three pick-up tubes for the colour components of the different spectral compositions, and a prism arrangement which ensures splitting which 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, of, for example, 15 microns.
  • 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 which are overlapped.
  • the assemblies whose strength and resistivity against shocks are not very large are in the long run still further affected by atmospheric influences.
  • the minimum spacing of the prisms having such an indium spacer is not less than 30 microns which is rather large in practice.
  • the invention now provides a beam splitting assembly consisting of glass prisms, in which some of the .Iadd.surfaces of the .Iaddend.prisms are separated by an air gap, .[.the.]. .Iadd.which may be smaller than that produced by an indium spacer.
  • the .Iaddend.edges of the prism surfaces .[.of this assembly.]. are provided with a small strip.Iadd., .Iaddend.at the .[.glass.]. .Iadd.prism .Iaddend.surfaces bounding the air-gap, .[.optionally through a beam splitting layer or layers.]. of an adhering film of a thermoplastic material .[.located thereon.].. .Iadd.
  • These prism surfaces which bound the air-gap may be either glass surfaces or the surfaces of a beam-splitting layer or layers present on the glass surfaces. .Iaddend.
  • polyethylene terephthalate, poly-carbonate or poly-acrylates, which are excellently suitable
  • polyethylene is preferred.
  • polyethylene 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.
  • thermoplastic material and the glass surfaces may .Iaddend. also .Iadd.be .Iaddend.obtained .[.by means of the.]. .Iadd.between the thermoplastic material and the surface of a .Iaddend.beam splitting layer or layers which are obtained in the usual manner, which layers consist as a rule of chalcogenides such as ZnS, TiO 2 etc.
  • 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, 150° C. and the assembly is compressed at a pressure of approximately 15 g/mm 2 .
  • the spacing between the 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.
  • 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.
  • FIG. 1 shows a prism assembly according to the invention
  • FIG. 2 shows a prism whose surface bounding an air-gap is provided with strips according to the invention.
  • the prism assembly comprises prisms A, B and C separated by .[.at least one air-gap,.]. .Iadd.air-gaps .Iaddend.1 and .[.an interface.]. 2.
  • Prism C as shown in more detail in FIG. 2 has a surface 3 bounding the air-gap 1 which is provided with .[.a.]. polyethylene strips S.
  • FIG. 1 The ray paths through the prism assembly are shown in FIG. 1.
  • An incident ray i passes through prisms A and B and emerges from prism C as ray r 3 . Part of the incident ray is reflected at the air-gaps .Iadd.1 and .Iaddend.2 and emerges from prism B as r 2 while a portion of the incident ray is reflected at the air-gap .[.1.]. .Iadd.2 .Iaddend.and emerges from A as r 1 .

Abstract

A beam splitting prism assembly in which at least some of the prisms are separated by an air gap, optionally connected at the edges through the beam splitting layers by means of strips of a thermo-plastic material.

Description

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.
Essentially such a camera comprises three pick-up tubes for the colour components of the different spectral compositions, and a prism arrangement which ensures splitting which 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, of, for example, 15 microns.
According to United Kingdom patent specification No. 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 which are overlapped.
In practice this assembly was not very satisfactory. The glass-to-indium transitions entail annoying reflections.
The assemblies whose strength and resistivity against shocks are not very large are in the long run still further affected by atmospheric influences. The minimum spacing of the prisms having such an indium spacer is not less than 30 microns which is rather large in practice.
Finally the method of producing such a composite prism is not simple.
The invention now provides a beam splitting assembly consisting of glass prisms, in which some of the .Iadd.surfaces of the .Iaddend.prisms are separated by an air gap, .[.the.]. .Iadd.which may be smaller than that produced by an indium spacer. The .Iaddend.edges of the prism surfaces .[.of this assembly.]. are provided with a small strip.Iadd., .Iaddend.at the .[.glass.]. .Iadd.prism .Iaddend.surfaces bounding the air-gap, .[.optionally through a beam splitting layer or layers.]. of an adhering film of a thermoplastic material .[.located thereon.].. .Iadd.These prism surfaces which bound the air-gap may be either glass surfaces or the surfaces of a beam-splitting layer or layers present on the glass surfaces. .Iaddend.
Besides polyethylene terephthalate, poly-carbonate or poly-acrylates, which are excellently suitable, the use of polyethylene is preferred. 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 .Iadd.which is .Iaddend.obtained .[.is.]. .Iadd.between the thermoplastic material and the glass surfaces may .Iaddend. also .Iadd.be .Iaddend.obtained .[.by means of the.]. .Iadd.between the thermoplastic material and the surface of a .Iaddend.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, 150° C. and the assembly is compressed at a pressure of approximately 15 g/mm2. Starting from a 20 microns thick film the spacing between the 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 application Ser. No. 729,818, filed Oct. 4, 1976.
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.
The invention will be described with reference to the accompanying drawing in which:
FIG. 1 shows a prism assembly according to the invention; and
FIG. 2 shows a prism whose surface bounding an air-gap is provided with strips according to the invention.
As shown in FIG. 1, the prism assembly comprises prisms A, B and C separated by .[.at least one air-gap,.]. .Iadd.air-gaps .Iaddend.1 and .[.an interface.]. 2. Prism C, as shown in more detail in FIG. 2 has a surface 3 bounding the air-gap 1 which is provided with .[.a.]. polyethylene strips S.
The ray paths through the prism assembly are shown in FIG. 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-gaps .Iadd.1 and .Iaddend.2 and emerges from prism B as r2 while a portion of the incident ray is reflected at the air-gap .[.1.]. .Iadd.2 .Iaddend.and emerges from A as r1.

Claims (3)

What is claimed is:
1. A beam splitting prism assembly comprising a plurality of prisms .Iadd.having surfaces .Iaddend.separated by an air gap, the edges of the prism surfaces bounding the air-gap being provided with a small strip at the .[.glass.]. .Iadd.prism .Iaddend.surfaces, said strip comprising an adhering film of a thermoplastic material .[.located thereon forming a beam splitting layer.]..
2. A prism assembly as claimed in claim 1, wherein the thermoplastic material is polyethylene film.
3. A prism assembly as claimed in claim 2, wherein the film is coloured black.
US06/078,617 1975-10-09 1979-09-24 Color splitting prism assembly Expired - Lifetime USRE30513E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7511838 1975-10-09
NL7511838A NL7511838A (en) 1975-10-09 1975-10-09 COLOR-SEPARATING PRISMA COMBINATION.

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US05/730,164 Reissue US4084180A (en) 1975-10-09 1976-10-07 Color splitting prism assembly

Publications (1)

Publication Number Publication Date
USRE30513E true USRE30513E (en) 1981-02-10

Family

ID=19824621

Family Applications (2)

Application Number Title Priority Date Filing Date
US05/730,164 Expired - Lifetime US4084180A (en) 1975-10-09 1976-10-07 Color splitting prism assembly
US06/078,617 Expired - Lifetime USRE30513E (en) 1975-10-09 1979-09-24 Color splitting prism assembly

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US05/730,164 Expired - Lifetime US4084180A (en) 1975-10-09 1976-10-07 Color 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6377409B2 (en) * 1996-12-04 2002-04-23 Asahi Kogaku Kogyo Kabushiki Kaisha Prism and viewing optical system using the prism
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

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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.
US5646778A (en) * 1991-05-28 1997-07-08 Discovision Associates Optical beamsplitter
US5331622A (en) * 1991-05-28 1994-07-19 Applied Magnetics Corporation Compact optical head
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
DE69626202T2 (en) * 1995-05-11 2003-09-25 Digital Projection Ltd PROJECTION DEVICE
JPH09105806A (en) * 1995-10-13 1997-04-22 Minolta Co Ltd Air gap prism and its production
EP1019686B1 (en) * 1997-07-12 2009-08-26 Roper Industries, Inc. Multi-spectral two-dimensional imaging 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
US7961398B2 (en) * 2008-03-05 2011-06-14 Contrast Optical Design & Engineering, Inc. Multiple image camera and lens system
WO2009121068A2 (en) 2008-03-28 2009-10-01 Contrast Optical Design & Engineering, Inc. Whole beam image splitting system
US8184375B2 (en) * 2008-06-27 2012-05-22 Panavision Federal Systems, Llc Wavelength separating beamsplitter
WO2011032028A2 (en) * 2009-09-10 2011-03-17 Contrast Optical Design & Engineering, 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
US10257393B2 (en) 2016-02-12 2019-04-09 Contrast, Inc. Devices and methods for high dynamic range video
US10264196B2 (en) 2016-02-12 2019-04-16 Contrast, Inc. Systems and methods for HDR video capture with a mobile device
EP3497925B1 (en) 2016-08-09 2022-11-23 Contrast, Inc. Real-time hdr video for vehicle control
WO2019014057A1 (en) 2017-07-10 2019-01-17 Contrast, Inc. Stereoscopic camera
DE102018124129A1 (en) 2017-12-04 2019-06-06 Leica Microsystems Cms Gmbh Microscope system and method for microscopic imaging with such a microscope system
DE102018129832B4 (en) 2017-12-04 2020-08-27 Leica Microsystems Cms Gmbh Microscope system and method for microscopic imaging
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

Citations (1)

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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

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Patent Citations (1)

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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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6377409B2 (en) * 1996-12-04 2002-04-23 Asahi Kogaku Kogyo Kabushiki Kaisha Prism and viewing optical system using the prism
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

Also Published As

Publication number Publication date
GB1559286A (en) 1980-01-16
SE7611080L (en) 1977-04-10
US4084180A (en) 1978-04-11
DE2644595A1 (en) 1977-04-14
AU509314B2 (en) 1980-05-08
DE2644595B2 (en) 1978-04-20
CH611040A5 (en) 1979-05-15
FR2339874A1 (en) 1977-08-26
JPS5247320A (en) 1977-04-15
FR2339874B1 (en) 1982-09-10
AU1851776A (en) 1978-04-13
NL7511838A (en) 1977-04-13
IT1068585B (en) 1985-03-21
DE2644595C3 (en) 1979-01-11
CA1069360A (en) 1980-01-08

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