GB1421631A - Electric exposure time control arrangements for cameras - Google Patents

Electric exposure time control arrangements for cameras

Info

Publication number
GB1421631A
GB1421631A GB609573A GB609573A GB1421631A GB 1421631 A GB1421631 A GB 1421631A GB 609573 A GB609573 A GB 609573A GB 609573 A GB609573 A GB 609573A GB 1421631 A GB1421631 A GB 1421631A
Authority
GB
United Kingdom
Prior art keywords
capacitor
log
shutter
signal
pulses
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
GB609573A
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 GB1421631A publication Critical patent/GB1421631A/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
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Shutters For Cameras (AREA)
  • Exposure Control For Cameras (AREA)
  • Shutter-Related Mechanisms (AREA)
GB609573A 1972-02-10 1973-02-07 Electric exposure time control arrangements for cameras Expired GB1421631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47013963A JPS4884629A (enExample) 1972-02-10 1972-02-10

Publications (1)

Publication Number Publication Date
GB1421631A true GB1421631A (en) 1976-01-21

Family

ID=11847850

Family Applications (1)

Application Number Title Priority Date Filing Date
GB609573A Expired GB1421631A (en) 1972-02-10 1973-02-07 Electric exposure time control arrangements for cameras

Country Status (4)

Country Link
US (1) US3827060A (enExample)
JP (1) JPS4884629A (enExample)
DE (1) DE2306501C3 (enExample)
GB (1) GB1421631A (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048643A (en) * 1975-12-16 1977-09-13 Tokyo Shibaura Electric Co., Ltd. Exposure computation system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651744A (en) * 1969-01-13 1972-03-28 Copal Co Ltd Photographic camera
US3633473A (en) * 1969-11-10 1972-01-11 Copal Co Ltd Exposure control apparatus for photographic camera

Also Published As

Publication number Publication date
US3827060A (en) 1974-07-30
DE2306501C3 (de) 1975-04-30
DE2306501B2 (de) 1974-09-12
DE2306501A1 (de) 1973-08-16
JPS4884629A (enExample) 1973-11-10

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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