JPS5511292A - Exposure value control circuit - Google Patents
Exposure value control circuitInfo
- 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
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
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)
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 |
-
1979
- 1979-07-05 JP JP8516779A patent/JPS5511292A/en active Pending
Patent Citations (2)
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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