JPS57104120A - Automatic exposure control device for focal plane shutter - Google Patents

Automatic exposure control device for focal plane shutter

Info

Publication number
JPS57104120A
JPS57104120A JP55180968A JP18096880A JPS57104120A JP S57104120 A JPS57104120 A JP S57104120A JP 55180968 A JP55180968 A JP 55180968A JP 18096880 A JP18096880 A JP 18096880A JP S57104120 A JPS57104120 A JP S57104120A
Authority
JP
Japan
Prior art keywords
voltage
measuring
decision
characteristic curve
light
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.)
Granted
Application number
JP55180968A
Other languages
Japanese (ja)
Other versions
JPH0132965B2 (en
Inventor
Kazunori Mizogami
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 Corp
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 Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP55180968A priority Critical patent/JPS57104120A/en
Publication of JPS57104120A publication Critical patent/JPS57104120A/en
Publication of JPH0132965B2 publication Critical patent/JPH0132965B2/ja
Granted 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 obtain proper exposure in a simple constitution by switching over a reference voltage for comparision and decision to the charging voltae correspoinding to a characteristic curve of correction quantity based on the difference between reflectances of the shutter screen surface and the film surface at the time of transit of the rear edge of a light screen at the center of a picture frame. CONSTITUTION:When the leading edge of a shutter screen runs, the output from measuring light is integrated by an operational amplifier 2, an integration condenser 3, etc. This integral voltage is compared with a reference voltage for decision based on the information voltage of film sensitivity. Then, when the rear edge of a light screen passes the center of a picture frame, a measuring quantity is changed correspondingly to the characteristic curve of correction quantity DELTAEV based on the difference between reflectances of the shutter screen surface and the film surface. At this point, analog switches 16 and 18 are closed and the voltage from a charging circuit 15 consisting of a condenser 13 and a resistor 14 that are of the time constant corresponding to the characteristic curve of correction quantity DELTAEV is applied to the reference voltage for decision from an amplifier 8 through an amplifier 21. Therefore, a correct measuring output is decided and a proper exposure control is performed in a simple constitution that has no use of two set light measuring circuits.
JP55180968A 1980-12-19 1980-12-19 Automatic exposure control device for focal plane shutter Granted JPS57104120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55180968A JPS57104120A (en) 1980-12-19 1980-12-19 Automatic exposure control device for focal plane shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55180968A JPS57104120A (en) 1980-12-19 1980-12-19 Automatic exposure control device for focal plane shutter

Publications (2)

Publication Number Publication Date
JPS57104120A true JPS57104120A (en) 1982-06-29
JPH0132965B2 JPH0132965B2 (en) 1989-07-11

Family

ID=16092421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55180968A Granted JPS57104120A (en) 1980-12-19 1980-12-19 Automatic exposure control device for focal plane shutter

Country Status (1)

Country Link
JP (1) JPS57104120A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55120015A (en) * 1979-03-09 1980-09-16 Olympus Optical Co Ltd Reflection photometric device for focal plane shutter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55120015A (en) * 1979-03-09 1980-09-16 Olympus Optical Co Ltd Reflection photometric device for focal plane shutter

Also Published As

Publication number Publication date
JPH0132965B2 (en) 1989-07-11

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