JPS5657028A - Reflective photometric device for focal plane shutter - Google Patents
Reflective photometric device for focal plane shutterInfo
- 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
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
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)
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 |
-
1979
- 1979-10-17 JP JP13399279A patent/JPS5657028A/en active Granted
Cited By (2)
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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