JPS55155332A - Reflection photometric device for focal plane shutter - Google Patents
Reflection photometric device for focal plane shutterInfo
- 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
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
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) |
-
1979
- 1979-05-21 JP JP6294479A patent/JPS55155332A/en active Pending
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