JPS6423236A - Automatic aperture control device - Google Patents
Automatic aperture control deviceInfo
- Publication number
- JPS6423236A JPS6423236A JP62179466A JP17946687A JPS6423236A JP S6423236 A JPS6423236 A JP S6423236A JP 62179466 A JP62179466 A JP 62179466A JP 17946687 A JP17946687 A JP 17946687A JP S6423236 A JPS6423236 A JP S6423236A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- circuit
- aperture
- set value
- counter electromotive
- 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 normally actuate a device when external oscillation occurs by providing a limiter circuit which detects the rotating velocity of an aperture and makes a counter electromotive voltage generated in a damping coil not exceed a set value in the feedback circuit of the damping coil system. CONSTITUTION:When an exposure value detected in a video signal process circuit 4 is larger than the set value by comparing the exposure with the set value, a driving circuit 1 drives a driving coil 2 to close the aperture 3. When the external oscillation occurs, the driving circuit 1 and the driving coil 2 are operated so that the rotating velocity of the aperture 3 becomes zero by the damping coil 5. And when the counter electromotive voltage generated in the coil 5 exceeds + or -50mV, the limiter circuit 6 is operated so as to limit the counter electromotive voltage. Then, the device can be normally actuated without oscillated even if the external oscillation is given.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179466A JPS6423236A (en) | 1987-07-17 | 1987-07-17 | Automatic aperture control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179466A JPS6423236A (en) | 1987-07-17 | 1987-07-17 | Automatic aperture control device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6423236A true JPS6423236A (en) | 1989-01-25 |
Family
ID=16066343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62179466A Pending JPS6423236A (en) | 1987-07-17 | 1987-07-17 | Automatic aperture control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6423236A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04343110A (en) * | 1991-05-20 | 1992-11-30 | Sharp Corp | Iris control circuit |
-
1987
- 1987-07-17 JP JP62179466A patent/JPS6423236A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04343110A (en) * | 1991-05-20 | 1992-11-30 | Sharp Corp | Iris control circuit |
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