JPS5681820A - Signal processing system of photometric operating circuit in automatic camera - Google Patents
Signal processing system of photometric operating circuit in automatic cameraInfo
- Publication number
- JPS5681820A JPS5681820A JP15808979A JP15808979A JPS5681820A JP S5681820 A JPS5681820 A JP S5681820A JP 15808979 A JP15808979 A JP 15808979A JP 15808979 A JP15808979 A JP 15808979A JP S5681820 A JPS5681820 A JP S5681820A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- values
- setter
- information
- circuit
- 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 make the coincidence of input information set value and the display value of the input value to a photometric circuit easy without making accuracy enhancement of each information setting resistor by discarding the fractions bwlow the decimal point of EV values and making arithmetic operation with respect to operated input information.
CONSTITUTION: The light information from a photodiode 1, the EV signal from a manual shtter speed setter 2, the information from an aperture setter 3, and the information from an ASA sensitivity setter 4 are supplied to a selecting circuit 6 via an A/D converter 5. When the output of the setter 2 is selected, the values of ≤1EV are stored in a counter 7, and the values of ≥1EV in a counter 8. The counter 7 is reset by the reset signal RST and the content of the counter 8 is supplied to a photometric operating circuit 9, by the operated output whereof the values of ≥1EV are sent to a display device 10. when the output of the setter 4 is selected, the values of ≤1EV are stored in the ounter 7 and the values of ≥1EV in the counter 8. Next, the 1st digit of the counter 7 is reset, after which the contents of the counters 7 and 8 are sent to the circuit 9.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15808979A JPS5681820A (en) | 1979-12-07 | 1979-12-07 | Signal processing system of photometric operating circuit in automatic camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15808979A JPS5681820A (en) | 1979-12-07 | 1979-12-07 | Signal processing system of photometric operating circuit in automatic camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5681820A true JPS5681820A (en) | 1981-07-04 |
Family
ID=15664050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15808979A Pending JPS5681820A (en) | 1979-12-07 | 1979-12-07 | Signal processing system of photometric operating circuit in automatic camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5681820A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5140727A (en) * | 1974-10-03 | 1976-04-05 | Omron Tateisi Electronics Co | |
JPS5427427A (en) * | 1977-08-02 | 1979-03-01 | Copal Co Ltd | Manual exposure circuit for digital control shutter |
-
1979
- 1979-12-07 JP JP15808979A patent/JPS5681820A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5140727A (en) * | 1974-10-03 | 1976-04-05 | Omron Tateisi Electronics Co | |
JPS5427427A (en) * | 1977-08-02 | 1979-03-01 | Copal Co Ltd | Manual exposure circuit for digital control shutter |
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