GB2015758A - Camera exposure control - Google Patents

Camera exposure control

Info

Publication number
GB2015758A
GB2015758A GB7904588A GB7904588A GB2015758A GB 2015758 A GB2015758 A GB 2015758A GB 7904588 A GB7904588 A GB 7904588A GB 7904588 A GB7904588 A GB 7904588A GB 2015758 A GB2015758 A GB 2015758A
Authority
GB
United Kingdom
Prior art keywords
exposure control
exposure
control circuit
flash
capacitor
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.)
Withdrawn
Application number
GB7904588A
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.)
Seiko Koki KK
Original Assignee
Seiko Koki 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 Seiko Koki KK filed Critical Seiko Koki KK
Publication of GB2015758A publication Critical patent/GB2015758A/en
Withdrawn legal-status Critical Current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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • 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
    • G03B7/087—Analogue circuits for control of both exposure time and aperture
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Stroboscope Apparatuses (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

An exposure control circuit is connected to receive the output signal from a focus detecting circuit so that, during the taking of a flash photograph, exposure time and/or shutter aperture is a function of the distance of the object to be photographed. As shown, the camera is automatically focussed by a system 13-24. When a flash exposure is made, a capacitor 4 charges via a photo-sensitive element 3 and a parallel resistor 7. When the capacitor voltage equals a reference voltage derived from the system 13-24, an electromagnet closes a shutter-diaphragm (not shown). Figures 3, 4 and 5 (not shown) show alternative ways of introducing the focus value into the exposure control circuit. <IMAGE>
GB7904588A 1978-02-13 1979-02-09 Camera exposure control Withdrawn GB2015758A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1522078A JPS54107734A (en) 1978-02-13 1978-02-13 Flashmatic apparatus of shatter

Publications (1)

Publication Number Publication Date
GB2015758A true GB2015758A (en) 1979-09-12

Family

ID=11882774

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7904588A Withdrawn GB2015758A (en) 1978-02-13 1979-02-09 Camera exposure control

Country Status (3)

Country Link
JP (1) JPS54107734A (en)
DE (1) DE2904606A1 (en)
GB (1) GB2015758A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132369A (en) * 1982-12-01 1984-07-04 Pentacon Dresden Veb Apparatus for flash photography

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299461A (en) * 1980-03-31 1981-11-10 Polaroid Corporation Exposure and flash fire control system
JPS6368826A (en) * 1986-09-10 1988-03-28 Olympus Optical Co Ltd Exposure controller for single-lens reflex camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132369A (en) * 1982-12-01 1984-07-04 Pentacon Dresden Veb Apparatus for flash photography

Also Published As

Publication number Publication date
JPS54107734A (en) 1979-08-23
DE2904606A1 (en) 1979-08-16

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)