JPS55103530A - Exposure time control circuit of camera - Google Patents
Exposure time control circuit of cameraInfo
- Publication number
- JPS55103530A JPS55103530A JP1056679A JP1056679A JPS55103530A JP S55103530 A JPS55103530 A JP S55103530A JP 1056679 A JP1056679 A JP 1056679A JP 1056679 A JP1056679 A JP 1056679A JP S55103530 A JPS55103530 A JP S55103530A
- Authority
- JP
- Japan
- Prior art keywords
- exposure time
- output
- circuit
- converter
- supplied
- 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 set manual exposure time to digital quantity and achieve miniaturization with a simple constitution by changing over the automatic exposure time information having undergone photometric operation or the manual exposure time information having been manually set and supplying the same to an expansion time constant circuit.
CONSTITUTION: Automatic exposure time is operated 5 based on the logarithmic compression values such as of subject luminance, film sensitivity, aperture value and exposure magnification and the operated output and D/A converted 13 output are changed over 9 and supplied to an expansion time constant circuit 15. The output of a counter 7 and the output of a manual exposure time setting circuit 8 are changed over 10 and supplied to the D/A converter 13. In this case, the operated output is supplied to the circuit 15 and the counter output to the converter 13 at the automatic exposure time control and the output of the converter 13 is supplied to the circuit 15 and the output of the circuit 8 to the converter 13 at the manual exposure time control.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1056679A JPS55103530A (en) | 1979-02-01 | 1979-02-01 | Exposure time control circuit of camera |
US06/113,003 US4306785A (en) | 1979-02-01 | 1980-01-17 | Camera exposure time control circuit |
GB8002465A GB2045957B (en) | 1979-02-01 | 1980-01-24 | Camera shutter speed control and display |
GB8032779A GB2059612B (en) | 1979-02-01 | 1980-01-24 | Shutter speed control for a camera |
FR8002208A FR2448164A1 (en) | 1979-02-01 | 1980-02-01 | LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA |
DE3003745A DE3003745C2 (en) | 1979-02-01 | 1980-02-01 | Exposure time control circuit for a camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1056679A JPS55103530A (en) | 1979-02-01 | 1979-02-01 | Exposure time control circuit of camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55103530A true JPS55103530A (en) | 1980-08-07 |
Family
ID=11753789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1056679A Pending JPS55103530A (en) | 1979-02-01 | 1979-02-01 | Exposure time control circuit of camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55103530A (en) |
-
1979
- 1979-02-01 JP JP1056679A patent/JPS55103530A/en active Pending
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