JPS5579423A - Exposure control circuit of camera - Google Patents

Exposure control circuit of camera

Info

Publication number
JPS5579423A
JPS5579423A JP15484178A JP15484178A JPS5579423A JP S5579423 A JPS5579423 A JP S5579423A JP 15484178 A JP15484178 A JP 15484178A JP 15484178 A JP15484178 A JP 15484178A JP S5579423 A JPS5579423 A JP S5579423A
Authority
JP
Japan
Prior art keywords
control circuit
timer
exposure
microprocessor
specified
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
JP15484178A
Other languages
Japanese (ja)
Inventor
Masaaki Nakai
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP15484178A priority Critical patent/JPS5579423A/en
Priority to US06/101,252 priority patent/US4297012A/en
Publication of JPS5579423A publication Critical patent/JPS5579423A/en
Priority to US06/285,879 priority patent/US4401373A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To reduce the number of elements by sharing circuits, by using a microprocessor in the control of timer circuit, and operating the control circuit of other exposure action and related operations also with the same microprocessor.
CONSTITUTION: First, the data is set in a register for A/D conversion control from a microprocessor μ-PC5, and each value from a photometric circuit 12 is A/D- converted by the signal from a line 18 to be set into specified registers. When the A/D conversion end signal is received by μ-PC, the apex value at the time of specified exposure is set in the specified register. Then, the aperture value is calculated by μ-PC5. Next, when the shutter opening action starts, the determined exposure time TV is counted by a timer 3, and when the counting ends, the closing action is started by a shutter closing action control circuit 63. Also in the case of strobe photographing, the aperture value and exposure time are calculted similarly, and the exposure time is controlled by the counting by the timer 3.
COPYRIGHT: (C)1980,JPO&Japio
JP15484178A 1978-12-13 1978-12-13 Exposure control circuit of camera Pending JPS5579423A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP15484178A JPS5579423A (en) 1978-12-13 1978-12-13 Exposure control circuit of camera
US06/101,252 US4297012A (en) 1978-12-13 1979-12-07 Exposure control arrangement for photographic cameras
US06/285,879 US4401373A (en) 1978-12-13 1981-07-23 Exposure control arrangement for photographic cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15484178A JPS5579423A (en) 1978-12-13 1978-12-13 Exposure control circuit of camera

Publications (1)

Publication Number Publication Date
JPS5579423A true JPS5579423A (en) 1980-06-14

Family

ID=15593051

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15484178A Pending JPS5579423A (en) 1978-12-13 1978-12-13 Exposure control circuit of camera

Country Status (1)

Country Link
JP (1) JPS5579423A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS516546A (en) * 1974-07-05 1976-01-20 Canon Kk Roshutsuseigyohoho
JPS5152773A (en) * 1974-11-01 1976-05-10 Canon Kk Tanyuryokuyo aad henkansochi
JPS5258529A (en) * 1975-11-08 1977-05-14 Canon Inc Camera system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS516546A (en) * 1974-07-05 1976-01-20 Canon Kk Roshutsuseigyohoho
JPS5152773A (en) * 1974-11-01 1976-05-10 Canon Kk Tanyuryokuyo aad henkansochi
JPS5258529A (en) * 1975-11-08 1977-05-14 Canon Inc Camera system

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