JPS5611443A - Exposure control circuit which digitally controlls diaphragm and exposure time - Google Patents

Exposure control circuit which digitally controlls diaphragm and exposure time

Info

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
Application number
JP8576079A
Other languages
Japanese (ja)
Inventor
Sadao Muramatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Yashica Co Ltd
Original Assignee
Kyocera Corp
Yashica Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyocera Corp, Yashica Co Ltd filed Critical Kyocera Corp
Priority to JP8576079A priority Critical patent/JPS5611443A/en
Publication of JPS5611443A publication Critical patent/JPS5611443A/en
Pending legal-status Critical Current

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
JP8576079A 1979-07-06 1979-07-06 Exposure control circuit which digitally controlls diaphragm and exposure time Pending JPS5611443A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258529A (en) * 1975-11-08 1977-05-14 Canon Inc Camera system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258529A (en) * 1975-11-08 1977-05-14 Canon Inc Camera system

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