JPS5611443A - Exposure control circuit which digitally controlls diaphragm and exposure time - Google Patents
Exposure control circuit which digitally controlls diaphragm and exposure timeInfo
- Publication number
- JPS5611443A JPS5611443A JP8576079A JP8576079A JPS5611443A JP S5611443 A JPS5611443 A JP S5611443A JP 8576079 A JP8576079 A JP 8576079A JP 8576079 A JP8576079 A JP 8576079A JP S5611443 A JPS5611443 A JP S5611443A
- Authority
- JP
- Japan
- Prior art keywords
- exposure
- digital
- time
- aperture
- reset
- 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
Abstract
PURPOSE: To make possible digital exposure controlling by comparing the calculated shutter time and stopping-down amount with the clock count values of binary counters and the count value of the pulses generated during travelling of an aperture control member, respectively.
CONSTITUTION: At the aperture controlling, the operated value of the digital stopping-down amount calculated by an arithmetic part OPE and the digital count values by plural binary counters 2 of the effective pulses PA shaped based on the pulses Pn generated by the gear turning cooperatively with an aperture control member via an AND gate G1 and an OR gate G2 are compared, and when they coincide, flip-flop F2 is reset. Exposure is controlled by this reset output. On the other hand, the digital shutter time calculated by the arithmetic part OPE is similarly compared with the digital values by counting of clock ϕ0 of the counters 2 via an OR circuit G2, by which the flip-flop F2 is reset and the shutter second time is controlled, thus the exposure may be digitally controlled according to the aperture and exposure time.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8576079A JPS5611443A (en) | 1979-07-06 | 1979-07-06 | Exposure control circuit which digitally controlls diaphragm and exposure time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8576079A JPS5611443A (en) | 1979-07-06 | 1979-07-06 | Exposure control circuit which digitally controlls diaphragm and exposure time |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5611443A true JPS5611443A (en) | 1981-02-04 |
Family
ID=13867812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8576079A Pending JPS5611443A (en) | 1979-07-06 | 1979-07-06 | Exposure control circuit which digitally controlls diaphragm and exposure time |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5611443A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5258529A (en) * | 1975-11-08 | 1977-05-14 | Canon Inc | Camera system |
-
1979
- 1979-07-06 JP JP8576079A patent/JPS5611443A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5258529A (en) * | 1975-11-08 | 1977-05-14 | Canon Inc | Camera system |
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