JPS5657028A - Reflective photometric device for focal plane shutter - Google Patents

Reflective photometric device for focal plane shutter

Info

Publication number
JPS5657028A
JPS5657028A JP13399279A JP13399279A JPS5657028A JP S5657028 A JPS5657028 A JP S5657028A JP 13399279 A JP13399279 A JP 13399279A JP 13399279 A JP13399279 A JP 13399279A JP S5657028 A JPS5657028 A JP S5657028A
Authority
JP
Japan
Prior art keywords
face
reflection
circuit
output voltage
corrected
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
JP13399279A
Other languages
Japanese (ja)
Other versions
JPS6123535B2 (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 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 JP13399279A priority Critical patent/JPS5657028A/en
Priority to US06/170,514 priority patent/US4343541A/en
Priority to DE3034035A priority patent/DE3034035C2/en
Publication of JPS5657028A publication Critical patent/JPS5657028A/en
Publication of JPS6123535B2 publication Critical patent/JPS6123535B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To make the exposure time proper, by correcting the integral value, which is obtained by measuring the reflection light from the black leading screen face and the film face by a photoelectric conversion element, by an adding circuit and a sample hold circuit.
CONSTITUTION: The reflection light from shutter leading screen face B and film face E different is reflection factor is measured to generate an integral voltage. This integral voltage is supplied to the sample hole circuit consisting of hold capacitor C2 and operational amplifier OP3 to be able to hold it, and the output voltage of this circuit is corrected by the reflection correction coefficient. This corrected output voltage and the integral voltage are added by the summing amplifying circuit consisting of resistances R0, R0/n, and operational amplifier OP2, thus obtaining output voltage V3 corrected properly. Here, (n) indicates the coefficient based on the difference between reflection factors of the standard film face and the black leading screen face. Thus, even if the leading screen face and the film face are different in reflection factor, an accurate exposure time can be determined.
COPYRIGHT: (C)1981,JPO&Japio
JP13399279A 1979-09-17 1979-10-17 Reflective photometric device for focal plane shutter Granted JPS5657028A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP13399279A JPS5657028A (en) 1979-10-17 1979-10-17 Reflective photometric device for focal plane shutter
US06/170,514 US4343541A (en) 1979-09-17 1980-07-21 Reflection photometric apparatus for camera including focal plane shutter
DE3034035A DE3034035C2 (en) 1979-09-17 1980-09-10 Exposure measuring device for a camera with focal plane shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13399279A JPS5657028A (en) 1979-10-17 1979-10-17 Reflective photometric device for focal plane shutter

Publications (2)

Publication Number Publication Date
JPS5657028A true JPS5657028A (en) 1981-05-19
JPS6123535B2 JPS6123535B2 (en) 1986-06-06

Family

ID=15117847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13399279A Granted JPS5657028A (en) 1979-09-17 1979-10-17 Reflective photometric device for focal plane shutter

Country Status (1)

Country Link
JP (1) JPS5657028A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS574027A (en) * 1980-06-09 1982-01-09 Minolta Camera Co Ltd Exposure control device for camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS574027A (en) * 1980-06-09 1982-01-09 Minolta Camera Co Ltd Exposure control device for camera
JPH0137725B2 (en) * 1980-06-09 1989-08-09 Minolta Camera Kk

Also Published As

Publication number Publication date
JPS6123535B2 (en) 1986-06-06

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