JPS57621A - Exposure controller - Google Patents

Exposure controller

Info

Publication number
JPS57621A
JPS57621A JP7451380A JP7451380A JPS57621A JP S57621 A JPS57621 A JP S57621A JP 7451380 A JP7451380 A JP 7451380A JP 7451380 A JP7451380 A JP 7451380A JP S57621 A JPS57621 A JP S57621A
Authority
JP
Japan
Prior art keywords
photocurrent
differential amplifier
voltage
terminal
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.)
Pending
Application number
JP7451380A
Other languages
Japanese (ja)
Inventor
Masabumi Yamazaki
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP7451380A priority Critical patent/JPS57621A/en
Publication of JPS57621A publication Critical patent/JPS57621A/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
    • G03B7/08—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

Landscapes

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

Abstract

PURPOSE:To prevent the occurrence of errors owing to static electricity or leak current of photocurrent under low voltage by changing the amplification factor of a photocurrent amplifying means or the magnitude of the decision signal of a comparing and deciding means according to film sensitivities. CONSTITUTION:When a shutter front curtain is run, photocurrent I corresponding to the brightness of the object is outputted from a photodiode 10. The photocurrent I is amplified by a differential amplifier 18, and transistors Trs 22, 24 according to the constant current I1 from constant current 20 and the output current I2 of a differential amplifier 32, and is supplied to the inversion input terminal of a differential amplifier 34. When a switch 40 is opened cooperatively with the traveling of the shutter front curtain, the output current of the amplifier 34 is charged to a capacitor 38. When the terminal voltage of the capacitor 38 rises and coincides with the voltage of a terminal J2, Tr 48 changes from on to off, and a magnet 50 for detaining the rear curtain is deenergized, by which the shutter rear curtain is run. With this constitution, introduction of film sensitivity simple necessitates controlling either one of variable resistances 26, 42.
JP7451380A 1980-06-03 1980-06-03 Exposure controller Pending JPS57621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7451380A JPS57621A (en) 1980-06-03 1980-06-03 Exposure controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7451380A JPS57621A (en) 1980-06-03 1980-06-03 Exposure controller

Publications (1)

Publication Number Publication Date
JPS57621A true JPS57621A (en) 1982-01-05

Family

ID=13549480

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7451380A Pending JPS57621A (en) 1980-06-03 1980-06-03 Exposure controller

Country Status (1)

Country Link
JP (1) JPS57621A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246727A (en) * 1985-04-24 1986-11-04 Olympus Optical Co Ltd Automatic exposing circuit for camera
KR20150111838A (en) 2014-03-26 2015-10-06 가부시키가이샤 세이부 기켄 Rotary type gas adsorption concentration device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246727A (en) * 1985-04-24 1986-11-04 Olympus Optical Co Ltd Automatic exposing circuit for camera
KR20150111838A (en) 2014-03-26 2015-10-06 가부시키가이샤 세이부 기켄 Rotary type gas adsorption concentration device

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