GB586957A - Improvements in or relating to three colour cameras - Google Patents

Improvements in or relating to three colour cameras

Info

Publication number
GB586957A
GB586957A GB2093743A GB2093743A GB586957A GB 586957 A GB586957 A GB 586957A GB 2093743 A GB2093743 A GB 2093743A GB 2093743 A GB2093743 A GB 2093743A GB 586957 A GB586957 A GB 586957A
Authority
GB
United Kingdom
Prior art keywords
reflectors
reflector
metallised
lens
per cent
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
Application number
GB2093743A
Original Assignee
Jack Howard Coote
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 Jack Howard Coote filed Critical Jack Howard Coote
Priority to GB2093743A priority Critical patent/GB586957A/en
Publication of GB586957A publication Critical patent/GB586957A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00Colour photography, other than mere exposure or projection of a colour film

Abstract

586,957. Optical systems; colour photography. COOTE, J. H. Dec. 14, 1943, No. 20937. [Classes 97 (i) and 98 (ii)] In an optical dividing system for tricolour separation, of the kind comprising two inclined metallised transmitting-reflectors, the metals deposited on the reflectors are different, and at least one exhibits spectral selection in the transmitted and reflected beams. As shown, the beam from the lens 1 of a tricolour camera falls upon a metallised reflector 2 which reflects a portion of the beam containing at least 50 per cent blue light to a blue-sensitive layer 3, and transmits a high proportion of red and green light to a second metallised reflector 4 which reflects a portion containing at least 50 per cent red light to a red-sensitive layer 5, the remaining mainly green light passing through the reflector 4 to a green-sensitive layer 6. Colour filters 13, 15, 16 are associated with the various sensitive layers. The reflectors may be enclosed in an all-glass or transparent plastic material prism block system extending from lens 1 to the planes of the filters. The metal of reflector 2 may be Al, Be or Ag, and that of reflector 4 Au, Cu or Zn, and may be deposited, by thermal, evaporation or cathodic sputtering in a high vacuum, upon the optically-flat surface of a transparent pellicle as of gelatin or cellulose nitrate, or upon optically - flat glass or transparent plastic material such as polymethyl methacrylate in plate or prism form. When only one of the reflectors exhibits spectral selection, the other, exhibiting high and uniform spectral reflection, may be a metal of Group VIII of the Periodic System; thus, the metal of 2 may be rhodium, and that of 4 gold. Interchange of the positions of the reflectors is possible if the composition of the incident light renders this desirable. The reflectors are preferably inclined at angles greater than 45 degrees to the lens axis, e.g. at 50 and 60 degrees respectively. For daylight work with fast panchromatic films and filters all having factors of from 5 to 6, surface 2 should reflect about 30 per cent of the light incident upon it, and surface 4 about 48 per cent. Further forms of the system are described in which (a) the reflectors consist of opticallyflat glasses meeting along a line intersecting the optical axis of the lens 1, with appropriate compensation (e.g. varying thickness of colour filters) for the differences in the lengths of the paths of the divided beams, and (b) the reflectors are formed on the internal surfaces of a compound prism block made up, e.g. of four similar glass or plastic material prisms of right-angled isosceles form cemented together with their refracting edges in contact, and in this form the colour filters may be in the prism block behind the metallised surfaces. Specifications 440,006 and 475,415 are referred to.
GB2093743A 1943-12-14 1943-12-14 Improvements in or relating to three colour cameras Expired GB586957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2093743A GB586957A (en) 1943-12-14 1943-12-14 Improvements in or relating to three colour cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2093743A GB586957A (en) 1943-12-14 1943-12-14 Improvements in or relating to three colour cameras

Publications (1)

Publication Number Publication Date
GB586957A true GB586957A (en) 1947-04-09

Family

ID=10154330

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2093743A Expired GB586957A (en) 1943-12-14 1943-12-14 Improvements in or relating to three colour cameras

Country Status (1)

Country Link
GB (1) GB586957A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2737076A (en) * 1952-06-12 1956-03-06 Technicolor Motion Picture Method of making optical prism
US2749792A (en) * 1951-11-05 1956-06-12 Technicolor Motion Picture Light dividing system
US2792740A (en) * 1952-06-28 1957-05-21 Rca Corp Multi-path optical systems
US2809570A (en) * 1953-04-07 1957-10-15 Technicolor Corp Optical system for relating color component images
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749792A (en) * 1951-11-05 1956-06-12 Technicolor Motion Picture Light dividing system
US2737076A (en) * 1952-06-12 1956-03-06 Technicolor Motion Picture Method of making optical prism
US2792740A (en) * 1952-06-28 1957-05-21 Rca Corp Multi-path optical systems
US2809570A (en) * 1953-04-07 1957-10-15 Technicolor Corp Optical system for relating color component images
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

Similar Documents

Publication Publication Date Title
Hass et al. Optical constants and reflectance and transmittance of evaporated aluminum in the visible and ultraviolet
US3700305A (en) Retroreflective microspheres having a dielectric mirror on a portion of their surface and retroreflective constructions containing such microspheres
US3202039A (en) Optical system for a color television camera
US3320671A (en) Luminous reticle for a sighting telescope
US2590906A (en) Reflection interference filter
US2748659A (en) Light source, searchlight or the like for polarized light
US4367921A (en) Low polarization beam splitter
US4072405A (en) Prism system for use in tricolor separation
US2403685A (en) Light filter
US6072628A (en) Optical polarisation device
DE3100632A1 (en) Multi-layer anti-reflection coating
US3559090A (en) Polarization free beam divider
EP0083090B1 (en) High efficiency optical system for three-color liquid crystal light valve image projection with color selective prepolarization
JPH02239219A (en) Lighting system for liquid crystal display (lcd) system
JPS58202408A (en) Heat-ray reflecting film
US3743380A (en) Polarized light source for underwater use
GB1330836A (en) Optical field-flattening devices
JPS6374005A (en) Rear reflection mirror consisting of multi-layered films
US2589930A (en) Color television light divider
US2520635A (en) Optical system
JPH02120801A (en) Surface reflecting mirror made of multilayered film
GB764054A (en) Improvements in or relating to reflex sights and finders
GB1318042A (en) Optical systems
GB1092579A (en) Improvements in and relating to lasers
GB1377627A (en) Beam splitting prisms