JPS5794730A - Exposure control device - Google Patents

Exposure control device

Info

Publication number
JPS5794730A
JPS5794730A JP10871581A JP10871581A JPS5794730A JP S5794730 A JPS5794730 A JP S5794730A JP 10871581 A JP10871581 A JP 10871581A JP 10871581 A JP10871581 A JP 10871581A JP S5794730 A JPS5794730 A JP S5794730A
Authority
JP
Japan
Prior art keywords
pulse
lock
start pulse
gate
turned
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
JP10871581A
Other languages
Japanese (ja)
Inventor
Yukio Mashita
Nobuaki Sakurada
Tadashi Ito
Fumio Ito
Nobuhiko Shinoda
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP10871581A priority Critical patent/JPS5794730A/en
Publication of JPS5794730A publication Critical patent/JPS5794730A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/091—Digital circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To easily perform the EE lock of a digital control single-lens reflex camera, by providing a lock signal generating circuit by which updating of a digital storage value is stopped. CONSTITUTION:A switch S1 is connected to the side (a) by depressing the first stage of a shutter button, and an AND gate AN1 is turned on by a start pulse generated from a pulse oscillator P1. As a result, a counter CC and an operating circuit LC are cleared, and a pulse of frequency being parallel to the luminance obtained from a resonance solid oscillating element F is counted by a period counter of pulse width of a reference pulse generator P2, and a photographic operation is executed by the operating circuit. It is repeated whenever a start pulse is generated, and the storage is updataed, but when an EE lock switch S0 is switched to the side (a) from the side (b), a gate AN1 is turned off, the start pulse is cut off, and the EE lock is executed.
JP10871581A 1981-07-10 1981-07-10 Exposure control device Pending JPS5794730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10871581A JPS5794730A (en) 1981-07-10 1981-07-10 Exposure control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10871581A JPS5794730A (en) 1981-07-10 1981-07-10 Exposure control device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP8084074A Division JPS519444A (en) 1974-07-15 1974-07-15 ROSHUTSUSEIGYO SOCHI

Publications (1)

Publication Number Publication Date
JPS5794730A true JPS5794730A (en) 1982-06-12

Family

ID=14491746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10871581A Pending JPS5794730A (en) 1981-07-10 1981-07-10 Exposure control device

Country Status (1)

Country Link
JP (1) JPS5794730A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5953821A (en) * 1982-09-21 1984-03-28 Kyocera Corp Photometric value storage device of camera

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2127480A1 (en) * 1970-06-04 1971-12-16 Minolta Camera K K , Osaka (Japan) Exposure control device for a photographic camera
US3742826A (en) * 1970-01-07 1973-07-03 Canon Kk Exposure control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742826A (en) * 1970-01-07 1973-07-03 Canon Kk Exposure control device
DE2127480A1 (en) * 1970-06-04 1971-12-16 Minolta Camera K K , Osaka (Japan) Exposure control device for a photographic camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5953821A (en) * 1982-09-21 1984-03-28 Kyocera Corp Photometric value storage device of camera

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