GB1389883A - Eyposure time control circuit for a camera - Google Patents

Eyposure time control circuit for a camera

Info

Publication number
GB1389883A
GB1389883A GB4163272A GB4163272A GB1389883A GB 1389883 A GB1389883 A GB 1389883A GB 4163272 A GB4163272 A GB 4163272A GB 4163272 A GB4163272 A GB 4163272A GB 1389883 A GB1389883 A GB 1389883A
Authority
GB
United Kingdom
Prior art keywords
camera
shutter
sept
comparators
exceeded
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
GB4163272A
Other languages
English (en)
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 GB1389883A publication Critical patent/GB1389883A/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
    • 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
    • G03B7/091—Digital circuits
    • G03B7/093—Digital circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Exposure Control For Cameras (AREA)
  • Shutter-Related Mechanisms (AREA)
  • Shutters For Cameras (AREA)
GB4163272A 1971-09-07 1972-09-07 Eyposure time control circuit for a camera Expired GB1389883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971081201U JPS5321112Y2 (enrdf_load_stackoverflow) 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
GB1389883A true GB1389883A (en) 1975-04-09

Family

ID=27987615

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4163272A Expired GB1389883A (en) 1971-09-07 1972-09-07 Eyposure time control circuit for a camera

Country Status (4)

Country Link
US (1) US3798662A (enrdf_load_stackoverflow)
JP (1) JPS5321112Y2 (enrdf_load_stackoverflow)
DE (1) DE2243391C3 (enrdf_load_stackoverflow)
GB (1) GB1389883A (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5833537B2 (ja) * 1973-01-29 1983-07-20 株式会社リコー 一眼レフレツクスカメラの測光情報表示装置
US4074292A (en) * 1973-02-06 1978-02-14 Canon Kabushiki Kaisha System for indicating photographic information
US4054887A (en) * 1973-04-16 1977-10-18 Ernest Leitz Gmbh Exposure control device for photographic cameras
JPS5539372Y2 (enrdf_load_stackoverflow) * 1973-07-27 1980-09-13
JPS5067650A (enrdf_load_stackoverflow) * 1973-10-17 1975-06-06
US4072962A (en) * 1975-07-03 1978-02-07 Nippon Kogaku K.K. Metering device
JPS5421329A (en) * 1977-07-18 1979-02-17 Hitachi Ltd Control system for cameras
US4433914A (en) 1979-09-14 1984-02-28 Vivitar Corporation Exposure meter
ITUD20050119A1 (it) * 2005-07-18 2007-01-19 Neuricam Spa Elemento fotosensibile per sensori elettro-ottici

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870406A (en) * 1957-06-03 1959-01-20 Caldwell P Smith Device for voltage measurement
JPS5211223B1 (enrdf_load_stackoverflow) * 1970-04-06 1977-03-29
JPS519530A (enrdf_load_stackoverflow) * 1974-07-15 1976-01-26 Hitachi Ltd

Also Published As

Publication number Publication date
DE2243391A1 (de) 1973-03-15
JPS5321112Y2 (enrdf_load_stackoverflow) 1978-06-02
US3798662A (en) 1974-03-19
DE2243391C3 (de) 1981-07-02
DE2243391B2 (de) 1980-11-06
JPS4837644U (enrdf_load_stackoverflow) 1973-05-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee