GB1471970A - Exposure time control circuit for a camera - Google Patents

Exposure time control circuit for a camera

Info

Publication number
GB1471970A
GB1471970A GB5250374A GB5250374A GB1471970A GB 1471970 A GB1471970 A GB 1471970A GB 5250374 A GB5250374 A GB 5250374A GB 5250374 A GB5250374 A GB 5250374A GB 1471970 A GB1471970 A GB 1471970A
Authority
GB
United Kingdom
Prior art keywords
counter
control circuit
see
exposure time
dec
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
GB5250374A
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 GB1471970A publication Critical patent/GB1471970A/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
    • G03B7/091—Digital circuits
    • G03B7/093—Digital circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
GB5250374A 1973-12-05 1974-12-04 Exposure time control circuit for a camera Expired GB1471970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13791773A JPS5087645A (enrdf_load_stackoverflow) 1973-12-05 1973-12-05

Publications (1)

Publication Number Publication Date
GB1471970A true GB1471970A (en) 1977-04-27

Family

ID=15209692

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5250374A Expired GB1471970A (en) 1973-12-05 1974-12-04 Exposure time control circuit for a camera

Country Status (4)

Country Link
JP (1) JPS5087645A (enrdf_load_stackoverflow)
FR (1) FR2254039B1 (enrdf_load_stackoverflow)
GB (1) GB1471970A (enrdf_load_stackoverflow)
NL (1) NL157115B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289545A (en) * 1994-05-16 1995-11-22 Samsung Aerospace Ind Brightness measuring

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5345233A (en) 1976-10-05 1978-04-22 Asahi Optical Co Ltd Device for manually setting digital electric control camera
GB2090668B (en) * 1980-11-04 1984-10-31 Asahi Optical Co Ltd Aperture value control device utilizing a frequency signal from a flash unit on a camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289545A (en) * 1994-05-16 1995-11-22 Samsung Aerospace Ind Brightness measuring
GB2289545B (en) * 1994-05-16 1997-12-10 Samsung Aerospace Ind A brightness detecting device for an automatic exposure camera and a method of detecting brightness in an automatic exposure camera

Also Published As

Publication number Publication date
FR2254039A1 (enrdf_load_stackoverflow) 1975-07-04
NL157115B (nl) 1978-06-15
NL7415735A (nl) 1975-06-09
JPS5087645A (enrdf_load_stackoverflow) 1975-07-14
DE2457306A1 (de) 1975-06-12
FR2254039B1 (enrdf_load_stackoverflow) 1977-10-28
DE2457306B2 (de) 1977-01-13

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee