JPS5511292A - Exposure value control circuit - Google Patents

Exposure value control circuit

Info

Publication number
JPS5511292A
JPS5511292A JP8516779A JP8516779A JPS5511292A JP S5511292 A JPS5511292 A JP S5511292A JP 8516779 A JP8516779 A JP 8516779A JP 8516779 A JP8516779 A JP 8516779A JP S5511292 A JPS5511292 A JP S5511292A
Authority
JP
Japan
Prior art keywords
aperture
output
flash
completion
control 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
Application number
JP8516779A
Other languages
Japanese (ja)
Inventor
Yukio Iura
Masayoshi Yamamichi
Takashi Uchiyama
Tetsuya Taguchi
Yukio Mashita
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 JP8516779A priority Critical patent/JPS5511292A/en
Publication of JPS5511292A publication Critical patent/JPS5511292A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain an exposure value control circuit capable of controlling the aperture on the basis of signal output upon completion of preparation for flash, by providing an aperture adjusting circuit using the output of an aperture information signal forming circuit and the output of a flash ready state detection circuit.
CONSTITUTION: A switching transistor Tr1 is connected in series between specified aperture information signal transmitting terminals e1 and f1 of a dimmer type flash device. when a switch S3 is set to one of terminals A1 to A3, an aperture plate provided in front of a photo detector to detect the light reflected from the object built in the flash device displaces in cooperation. Upon completion of charging of a condenser C2 charged by a high voltage power source V, the transistor Tr1 is energized, and the specified aperture information is displayed by an aperutre value display meter M provided on the camera side through the switch S3, therminals A1 to A3 and resistors r1 to r3. Upon shutter release, the aperture is automatically set according to the indication by the meter M, so that an appropriate exposure may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP8516779A 1979-07-05 1979-07-05 Exposure value control circuit Pending JPS5511292A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8516779A JPS5511292A (en) 1979-07-05 1979-07-05 Exposure value control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8516779A JPS5511292A (en) 1979-07-05 1979-07-05 Exposure value control circuit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49036794A Division JPS50129224A (en) 1974-04-01 1974-04-01

Publications (1)

Publication Number Publication Date
JPS5511292A true JPS5511292A (en) 1980-01-26

Family

ID=13851096

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8516779A Pending JPS5511292A (en) 1979-07-05 1979-07-05 Exposure value control circuit

Country Status (1)

Country Link
JP (1) JPS5511292A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1907059A1 (en) * 1968-02-13 1969-10-02 Lumina Sprl Device for controlling capacitor discharge pulses
US3710701A (en) * 1970-12-21 1973-01-16 Canon Kk Flash device for a camera and a photographing system with an artificial illuminator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1907059A1 (en) * 1968-02-13 1969-10-02 Lumina Sprl Device for controlling capacitor discharge pulses
US3710701A (en) * 1970-12-21 1973-01-16 Canon Kk Flash device for a camera and a photographing system with an artificial illuminator

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