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GB1006145A - An apparatus for automatically adjusting the exposure aperture in cameras - Google Patents

An apparatus for automatically adjusting the exposure aperture in cameras

Info

Publication number
GB1006145A
GB1006145A GB1667264A GB1667264A GB1006145A GB 1006145 A GB1006145 A GB 1006145A GB 1667264 A GB1667264 A GB 1667264A GB 1667264 A GB1667264 A GB 1667264A GB 1006145 A GB1006145 A GB 1006145A
Authority
GB
United Kingdom
Prior art keywords
galvanometer
current
battery
oscillator
cameras
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
GB1667264A
Inventor
Takeo Yamada
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.)
Nikon Corp
Original Assignee
Nippon Kogaku KK
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 Nippon Kogaku KK filed Critical Nippon Kogaku KK
Priority to GB1667264A priority Critical patent/GB1006145A/en
Publication of GB1006145A publication Critical patent/GB1006145A/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)
  • Exposure Control For Cameras (AREA)

Abstract

1,006,145. Photometric arrangements. NIPPON KOGAKU K.K. April 22,1964, No. 16672/64. Heading G1A. [Also in Division G2]. In a photometric device of the type in which a photosensitive cell energises a moving coil galvanometer, static friction effects are overcome by connecting an oscillator circuit to the galvanometer to superimpose an alternating current upon the direct current through the coil. The current from battery B flowing through galvanometer G is controlled in accordance with ambient brightness by the CdS photoresistor R t . Superimposed on this current is a small amplitude A.C. from an oscillator O energized from battery B. Photoresistor R t may be replaced by a photovoltaic cell, fig. 2, (not shown) in which case the battery powers only oscillator O. The galvanometer may be coupled to diaphragm blade to control the exposure in a photographic camera.
GB1667264A 1964-04-22 1964-04-22 An apparatus for automatically adjusting the exposure aperture in cameras Expired GB1006145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1667264A GB1006145A (en) 1964-04-22 1964-04-22 An apparatus for automatically adjusting the exposure aperture in cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1667264A GB1006145A (en) 1964-04-22 1964-04-22 An apparatus for automatically adjusting the exposure aperture in cameras

Publications (1)

Publication Number Publication Date
GB1006145A true GB1006145A (en) 1965-09-29

Family

ID=10081544

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1667264A Expired GB1006145A (en) 1964-04-22 1964-04-22 An apparatus for automatically adjusting the exposure aperture in cameras

Country Status (1)

Country Link
GB (1) GB1006145A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427941A (en) * 1966-07-28 1969-02-18 Eastman Kodak Co Automatic exposure control
US3483807A (en) * 1965-11-23 1969-12-16 Agfa Gevaert Ag Photographic camera with an electromagnetically operable lens diaphragm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483807A (en) * 1965-11-23 1969-12-16 Agfa Gevaert Ag Photographic camera with an electromagnetically operable lens diaphragm
US3427941A (en) * 1966-07-28 1969-02-18 Eastman Kodak Co Automatic exposure control

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