JPS57129423A - Strobo dimming method - Google Patents

Strobo dimming method

Info

Publication number
JPS57129423A
JPS57129423A JP56014935A JP1493581A JPS57129423A JP S57129423 A JPS57129423 A JP S57129423A JP 56014935 A JP56014935 A JP 56014935A JP 1493581 A JP1493581 A JP 1493581A JP S57129423 A JPS57129423 A JP S57129423A
Authority
JP
Japan
Prior art keywords
strobo
reaches
value
flashing
shutter
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.)
Pending
Application number
JP56014935A
Other languages
Japanese (ja)
Inventor
Minoru Arai
Hiroyuki Kobayashi
Yoshihiro Ide
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.)
MAMIYA KOUKI KK
Mamiya Camera Co Ltd
Original Assignee
MAMIYA KOUKI KK
Mamiya Camera 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 MAMIYA KOUKI KK, Mamiya Camera Co Ltd filed Critical MAMIYA KOUKI KK
Priority to JP56014935A priority Critical patent/JPS57129423A/en
Publication of JPS57129423A publication Critical patent/JPS57129423A/en
Pending 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
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To compensate the contrast at backlight, by flashing a strobo when film exposure reaches the 1st specified value and stopping the flashing when it reaches the 2nd value. CONSTITUTION:A trigger switch 4 turns off with a shutter opened and an integration capacitor 5 is charged with optical current corresponding to the reflection light from the film surface detected with a photodetector 1. When this charging value reaches the 1st specified value, a flash trigger circuit 16 is operated with an output of a comparator 11 and a strobo 17 is flashed. Further, when the value reaches the 2nd specified value, the flashing of the strobo 17 is stopped via a flash stop pulse generating circuit with the output of a comparator 10 and a shutter magnet 14 is degaussed to close the shutter by turning off a transistor 13.
JP56014935A 1981-02-05 1981-02-05 Strobo dimming method Pending JPS57129423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56014935A JPS57129423A (en) 1981-02-05 1981-02-05 Strobo dimming method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56014935A JPS57129423A (en) 1981-02-05 1981-02-05 Strobo dimming method

Publications (1)

Publication Number Publication Date
JPS57129423A true JPS57129423A (en) 1982-08-11

Family

ID=11874819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56014935A Pending JPS57129423A (en) 1981-02-05 1981-02-05 Strobo dimming method

Country Status (1)

Country Link
JP (1) JPS57129423A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773469A1 (en) * 1995-11-13 1997-05-14 Eastman Kodak Company Digitally controlled quench flash circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990527A (en) * 1972-12-27 1974-08-29

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990527A (en) * 1972-12-27 1974-08-29

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773469A1 (en) * 1995-11-13 1997-05-14 Eastman Kodak Company Digitally controlled quench flash circuit
US5682562A (en) * 1995-11-13 1997-10-28 Eastman Kodak Company Digitally controlled quench flash circuit

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