GB491410A - Exposure controlling device for kinematograph or photographic cameras - Google Patents

Exposure controlling device for kinematograph or photographic cameras

Info

Publication number
GB491410A
GB491410A GB3146937A GB3146937A GB491410A GB 491410 A GB491410 A GB 491410A GB 3146937 A GB3146937 A GB 3146937A GB 3146937 A GB3146937 A GB 3146937A GB 491410 A GB491410 A GB 491410A
Authority
GB
United Kingdom
Prior art keywords
cell
diaphragm
diaphragms
relays
relay
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
GB3146937A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRUECOLOUR FILM Ltd
Original Assignee
TRUECOLOUR FILM Ltd
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 TRUECOLOUR FILM Ltd filed Critical TRUECOLOUR FILM Ltd
Priority to GB3146937A priority Critical patent/GB491410A/en
Publication of GB491410A publication Critical patent/GB491410A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/085—Analogue circuits for control of aperture

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

491,410. Automatic control systems. TRUECOLOUR FILM, Ltd., and WHALEN, F. C. Nov. 16, 1937, No. 31469. [Class 38 (iv)] [Also in Group XL] For automatically controlling a camera diaphragm 1 by means of a photo-cell 6 provided with a diaphragm 4 moving in unison with the diaphragm 1, a mirror galvanometer 7 is connected to the cell 6 to control the action of a, beam of light from a source 8 on another cell 10, which in turn controls the diaphragms 1, 4. The cell 10 is connected to a thermionic valve 11 controlling a relay 12, 13 to operate a motor 12 one way or the other to adjust the diaphragms to maintain the illumination of the cell 6 at a predetermined value. In a modification, two control cells 10 are used with two thermionic valves and relays, two mirrors 9 being used to throw the light on one cell or the other according to the deflection of the galvanometer. In another modification, the reversible motor 12 is replaced by a differential gear wheel mechanism driven by a continuously rotating shaft and transmitting rotation to the worms 5, 3 in one direction or the other according to the operation of brakes by the relay or relays. These devices may be pre-set to desired values. When an illuminant is used as in photoprinting, means may be provided to adjust the intensity of the illumination. Specification 429,676, [Group XX], is referred to.
GB3146937A 1937-11-16 1937-11-16 Exposure controlling device for kinematograph or photographic cameras Expired GB491410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3146937A GB491410A (en) 1937-11-16 1937-11-16 Exposure controlling device for kinematograph or photographic cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3146937A GB491410A (en) 1937-11-16 1937-11-16 Exposure controlling device for kinematograph or photographic cameras

Publications (1)

Publication Number Publication Date
GB491410A true GB491410A (en) 1938-09-01

Family

ID=10323551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3146937A Expired GB491410A (en) 1937-11-16 1937-11-16 Exposure controlling device for kinematograph or photographic cameras

Country Status (1)

Country Link
GB (1) GB491410A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421476A (en) * 1943-06-18 1947-06-03 Rca Corp Photoelectric control apparatus for diaphragms
US2421499A (en) * 1943-11-22 1947-06-03 Rca Corp Shutter for controlling light along two independent optical paths
US2423322A (en) * 1944-08-10 1947-07-01 Jr Samuel C Hurley Vehicular light control device having polarizing elements
US2453693A (en) * 1946-09-03 1948-11-16 Charles W Armstrong Automatic diaphragm control
US2655086A (en) * 1951-04-13 1953-10-13 Neville E Walker Autoamtic camera light aperture control
US2655848A (en) * 1950-02-09 1953-10-20 Jr Howard A Gray Automatically controlled photoelectric iris
US2906187A (en) * 1954-01-07 1959-09-29 Dotson Kimes Entpr Automatic camera control
US3048090A (en) * 1958-02-20 1962-08-07 Gauthier Gmbh A Photogrpahic camera
US3122978A (en) * 1964-03-03 Blieske

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122978A (en) * 1964-03-03 Blieske
US2421476A (en) * 1943-06-18 1947-06-03 Rca Corp Photoelectric control apparatus for diaphragms
US2421499A (en) * 1943-11-22 1947-06-03 Rca Corp Shutter for controlling light along two independent optical paths
US2423322A (en) * 1944-08-10 1947-07-01 Jr Samuel C Hurley Vehicular light control device having polarizing elements
US2453693A (en) * 1946-09-03 1948-11-16 Charles W Armstrong Automatic diaphragm control
US2655848A (en) * 1950-02-09 1953-10-20 Jr Howard A Gray Automatically controlled photoelectric iris
US2655086A (en) * 1951-04-13 1953-10-13 Neville E Walker Autoamtic camera light aperture control
US2906187A (en) * 1954-01-07 1959-09-29 Dotson Kimes Entpr Automatic camera control
US3048090A (en) * 1958-02-20 1962-08-07 Gauthier Gmbh A Photogrpahic camera

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