GB1281897A - Exposure control system for a camera - Google Patents

Exposure control system for a camera

Info

Publication number
GB1281897A
GB1281897A GB3338969A GB3338969A GB1281897A GB 1281897 A GB1281897 A GB 1281897A GB 3338969 A GB3338969 A GB 3338969A GB 3338969 A GB3338969 A GB 3338969A GB 1281897 A GB1281897 A GB 1281897A
Authority
GB
United Kingdom
Prior art keywords
film speed
photo
conductor
capacitor
exposure control
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
GB3338969A
Inventor
Tsukumo Mobusawa
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1281897A publication Critical patent/GB1281897A/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
    • G03B7/083—Analogue circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Shutter-Related Mechanisms (AREA)
  • Shutters For Cameras (AREA)

Abstract

1281897 Photographic exposure control ASAHI KOGAKU KOGYO K K 2 July 1969 [3 July 1968 20 May 1969] 33389/69 Heading G2A A photographic exposure control system comprises a photo-conductor 101 connected to provide a voltage dependent upon illumination intensity; a timing capacitor 103 which is charged at a rate depending upon one or more conditions other than illumination intensity (e.g. by adjusting a resistor 114 according to film speed); and means (e.g. a switching circuit 104) for providing a shutter closing signal when the voltages across the photoconductor 101 and capacitor 103 bear a predetermined relation. An electromagnet 105 preferably actuates the shutter. For SLR cameras, the voltage across photo-conductor 101 may be stored in a memory capacitor 113 on shutter release. Figs.5, 6 (not shown) depict transistor switching circuits and include a diaphragm (216), positional in front of the photo-conductor (201) and adjusted according to film speed or camera diaphragm setting, and a resistor (214) adjusted according to film speed or diaphragm setting to control charging of the timing capacitor (203). An ammeter (not shown) may be included to indicate exposure, its scale being displaced an amount depending on film speed setting. Reference has been directed by the Comptroller to Specification 1123579.
GB3338969A 1968-07-03 1969-07-02 Exposure control system for a camera Expired GB1281897A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4587768 1968-07-03
JP4580269 1969-05-20

Publications (1)

Publication Number Publication Date
GB1281897A true GB1281897A (en) 1972-07-19

Family

ID=26385877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3338969A Expired GB1281897A (en) 1968-07-03 1969-07-02 Exposure control system for a camera

Country Status (2)

Country Link
DE (1) DE1933889C3 (en)
GB (1) GB1281897A (en)

Also Published As

Publication number Publication date
DE1933889C3 (en) 1975-07-17
DE1933889A1 (en) 1970-01-08

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee