GB475415A - Improvements in or relating to optical systems - Google Patents
Improvements in or relating to optical systemsInfo
- Publication number
- GB475415A GB475415A GB1384436A GB1384436A GB475415A GB 475415 A GB475415 A GB 475415A GB 1384436 A GB1384436 A GB 1384436A GB 1384436 A GB1384436 A GB 1384436A GB 475415 A GB475415 A GB 475415A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- blue
- green
- minus
- reflected
- 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
- G02B27/1013—Beam splitting or combining systems for splitting or combining different wavelengths for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors
-
- 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
- G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
-
- 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
- G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
475,415. Colour photography. KLEIN, A.B. May 15, 1936, No. 13844. [Class 97 (i)] Relates to beam splitting blocks of the kind including two partially reflecting surfaces oppositely angularly disposed to an incident beam of light so that part of the beam passes through undeviated and parts are reflected laterally in opposite directions. A colour filter is provided within the block behind each of the semi-reflecting surfaces so that any stray light reflected from a portion of the prism lying beyond the reflecting plane responsible for the formation of a lateral image, will, when finally emerging from the face of the prism .adjacent to the plane in which the said image is to be recorded, be minus light which the recording filter is capable of transmitting or, if a photographic emulsion is used which does not require such a filter, which the emulsion is capable of recording. As shown, the block is built up from right-angle isosceles prisms 1, 2, 3, 4. The surfaces 17 and 20 are coated with a partially reflecting surface of, for example, aluminium. Magenta (minus green) filters 21, 22 are interposed and the prismscemented in pairs with hard Canada Balsam and dried off. The hypotenuse faces 18, 19 and 10, 13 are polished and the surface 17, 18 aluminized and cemented to the surface 10, 13 with soft Canada Balsam with the interposition of a yellow (minus blue) filter, and dried off. The filters are dyed films of, for example, cellulose acetate. This may be applied in the form of a liquid containing the dye. Of the light entering the prism, only red rays are passed through undeviated. Blue and red will be reflected through blue filter 30 to form the blue component image. Alternatively, a blue-sensitive emulsion may be used without a filter. Green and red rays are reflected through the green filter 31 to give the green component image. Alternatively, a yellow (minus blue) filter may be used with a green-sensitive emulsion. The red filter 34 is optional. A single objective 25 or separate objectives 26, 27, 28 may be used. By choosing different filters for inclusion in the block, the planes in which the three colour component images are recorded may be interchanged.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1384436A GB475415A (en) | 1936-05-15 | 1936-05-15 | Improvements in or relating to optical systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1384436A GB475415A (en) | 1936-05-15 | 1936-05-15 | Improvements in or relating to optical systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB475415A true GB475415A (en) | 1937-11-15 |
Family
ID=10030357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1384436A Expired GB475415A (en) | 1936-05-15 | 1936-05-15 | Improvements in or relating to optical systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB475415A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2638030A (en) * | 1948-12-27 | 1953-05-12 | Fish Schurman Corp | Beam splitting means |
US2737076A (en) * | 1952-06-12 | 1956-03-06 | Technicolor Motion Picture | Method of making optical prism |
US2754718A (en) * | 1953-07-14 | 1956-07-17 | Technicolor Motion Picture | Prism assembly and method of manufacture |
US4850685A (en) * | 1984-10-22 | 1989-07-25 | Seiko Epson Corporation | Projection-type color display device |
US4904061A (en) * | 1984-10-22 | 1990-02-27 | Seiko Epson Corporation | Projection-type liquid crystal display device with even color |
US4909601A (en) * | 1987-04-14 | 1990-03-20 | Seiko Epson Corporation | Projection-type color display device with light valves positioned at unequal distances from the light source |
US5191450A (en) * | 1987-04-14 | 1993-03-02 | Seiko Epson Corporation | Projection-type color display device having a driving circuit for producing a mirror-like image |
EP1006391A1 (en) * | 1998-12-04 | 2000-06-07 | Canon Kabushiki Kaisha | Cross dichroic prism |
DE102011117570A1 (en) | 2011-06-28 | 2013-01-03 | blnsight3D GmbH | Beam splitter cross for use in color beam splitter and beam splitter combination for bifurcating color distribution, has color splitting layer, which is applied with cut-off length that divides incident light beam |
-
1936
- 1936-05-15 GB GB1384436A patent/GB475415A/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2638030A (en) * | 1948-12-27 | 1953-05-12 | Fish Schurman Corp | Beam splitting means |
US2737076A (en) * | 1952-06-12 | 1956-03-06 | Technicolor Motion Picture | Method of making optical prism |
US2754718A (en) * | 1953-07-14 | 1956-07-17 | Technicolor Motion Picture | Prism assembly and method of manufacture |
US4850685A (en) * | 1984-10-22 | 1989-07-25 | Seiko Epson Corporation | Projection-type color display device |
US4904061A (en) * | 1984-10-22 | 1990-02-27 | Seiko Epson Corporation | Projection-type liquid crystal display device with even color |
US4909601A (en) * | 1987-04-14 | 1990-03-20 | Seiko Epson Corporation | Projection-type color display device with light valves positioned at unequal distances from the light source |
US5191450A (en) * | 1987-04-14 | 1993-03-02 | Seiko Epson Corporation | Projection-type color display device having a driving circuit for producing a mirror-like image |
EP1006391A1 (en) * | 1998-12-04 | 2000-06-07 | Canon Kabushiki Kaisha | Cross dichroic prism |
US6327092B1 (en) | 1998-12-04 | 2001-12-04 | Canon Kabushiki Kaisha | Cross dichroic prism |
DE102011117570A1 (en) | 2011-06-28 | 2013-01-03 | blnsight3D GmbH | Beam splitter cross for use in color beam splitter and beam splitter combination for bifurcating color distribution, has color splitting layer, which is applied with cut-off length that divides incident light beam |
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