JPS55155332A - Reflection photometric device for focal plane shutter - Google Patents

Reflection photometric device for focal plane shutter

Info

Publication number
JPS55155332A
JPS55155332A JP6294479A JP6294479A JPS55155332A JP S55155332 A JPS55155332 A JP S55155332A JP 6294479 A JP6294479 A JP 6294479A JP 6294479 A JP6294479 A JP 6294479A JP S55155332 A JPS55155332 A JP S55155332A
Authority
JP
Japan
Prior art keywords
voltage
front curtain
shutter
exposure
travel
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
JP6294479A
Other languages
Japanese (ja)
Inventor
Toshimasa Akagi
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 JP6294479A priority Critical patent/JPS55155332A/en
Publication of JPS55155332A publication Critical patent/JPS55155332A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To obtain the correct exposure second time free from any exposure error by continuously correcting the change in the photometric quantity based on the difference in the reflectance of a shutter front curtain plane and film plane by the reactance element cooperating with the travel of the front curtain.
CONSTITUTION: When the shutter is released, the reflected light incident from the subject through the taking lens falls onto the front curtain where the shutter begins to open and the film plane which has begun to exposure. By reflected by this, it is received in a photoelectric transducer D and is converted to photo current. This photo current flows to a variable capacitor Cv and is charged as integrating voltage Vcc. The output of an operation amplifier OP1 is compared with decision voltage VRF in an operational amplifier OP2. When the voltage Vc increases, the magnet 18 goes OFF to close the rear curtain. If in this case the capacity of Cv is changed in cooperation with the travel of the front curtain, the voltage Vc changes like the straight line F, thereby enabling the prevention of the occurrence of exposure error.
COPYRIGHT: (C)1980,JPO&Japio
JP6294479A 1979-05-21 1979-05-21 Reflection photometric device for focal plane shutter Pending JPS55155332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6294479A JPS55155332A (en) 1979-05-21 1979-05-21 Reflection photometric device for focal plane shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6294479A JPS55155332A (en) 1979-05-21 1979-05-21 Reflection photometric device for focal plane shutter

Publications (1)

Publication Number Publication Date
JPS55155332A true JPS55155332A (en) 1980-12-03

Family

ID=13214914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6294479A Pending JPS55155332A (en) 1979-05-21 1979-05-21 Reflection photometric device for focal plane shutter

Country Status (1)

Country Link
JP (1) JPS55155332A (en)

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