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FR985935A - Devices for automatically maintaining constant the quantity of light received on a surface - Google Patents

Devices for automatically maintaining constant the quantity of light received on a surface

Info

Publication number
FR985935A
FR985935A FR985935DA FR985935A FR 985935 A FR985935 A FR 985935A FR 985935D A FR985935D A FR 985935DA FR 985935 A FR985935 A FR 985935A
Authority
FR
France
Prior art keywords
devices
light received
maintaining constant
automatically maintaining
automatically
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
Other languages
French (fr)
Inventor
Jean-Rene-Marie Girard
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 filed Critical
Application granted granted Critical
Publication of FR985935A publication Critical patent/FR985935A/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)
FR985935D 1943-11-13 1943-11-13 Devices for automatically maintaining constant the quantity of light received on a surface Expired FR985935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR985935T 1943-11-13

Publications (1)

Publication Number Publication Date
FR985935A true FR985935A (en) 1951-07-25

Family

ID=9537716

Family Applications (1)

Application Number Title Priority Date Filing Date
FR985935D Expired FR985935A (en) 1943-11-13 1943-11-13 Devices for automatically maintaining constant the quantity of light received on a surface

Country Status (1)

Country Link
FR (1) FR985935A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841064A (en) * 1957-08-13 1958-07-01 Bell & Howell Co Exposure control for photographic cameras
US2858754A (en) * 1957-08-13 1958-11-04 Bell & Howell Co Exposure control for photographic cameras
US3057279A (en) * 1958-05-07 1962-10-09 Eastman Kodak Co Automatic control device for lens diaphragm
DE1166613B (en) * 1958-07-14 1964-03-26 Minnesota Mining & Mfg Automatic aperture regulator for photographic devices
DE1188931B (en) * 1957-06-22 1965-03-11 Agfa Ag Photoelectric device for the automatic control of a diaphragm arranged in the objective beam path of a photographic device
DE1190328B (en) * 1958-03-27 1965-04-01 Polaroid Corp Photographic shutter with a partially coverable opening
DE1266532B (en) * 1963-11-13 1968-04-18 Agfa Gevaert Ag Cover for a lighting optics
DE1279458B (en) * 1958-06-30 1968-10-03 Eastman Kodak Co Device for the automatic regulation of the aperture of a lens

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1188931B (en) * 1957-06-22 1965-03-11 Agfa Ag Photoelectric device for the automatic control of a diaphragm arranged in the objective beam path of a photographic device
US2841064A (en) * 1957-08-13 1958-07-01 Bell & Howell Co Exposure control for photographic cameras
US2858754A (en) * 1957-08-13 1958-11-04 Bell & Howell Co Exposure control for photographic cameras
DE1190328B (en) * 1958-03-27 1965-04-01 Polaroid Corp Photographic shutter with a partially coverable opening
US3057279A (en) * 1958-05-07 1962-10-09 Eastman Kodak Co Automatic control device for lens diaphragm
DE1279458B (en) * 1958-06-30 1968-10-03 Eastman Kodak Co Device for the automatic regulation of the aperture of a lens
DE1166613B (en) * 1958-07-14 1964-03-26 Minnesota Mining & Mfg Automatic aperture regulator for photographic devices
DE1266532B (en) * 1963-11-13 1968-04-18 Agfa Gevaert Ag Cover for a lighting optics

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