JPS5587129A - Automatic aperture circuit of lens - Google Patents
Automatic aperture circuit of lensInfo
- Publication number
- JPS5587129A JPS5587129A JP16566278A JP16566278A JPS5587129A JP S5587129 A JPS5587129 A JP S5587129A JP 16566278 A JP16566278 A JP 16566278A JP 16566278 A JP16566278 A JP 16566278A JP S5587129 A JPS5587129 A JP S5587129A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- image pickup
- rear light
- amplifier
- lens
- 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
Landscapes
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE: To enable the automatic controlling to correct aperture even at the image pickup of rear light by providing a circuit having non-linear characteristics according to input levels.
CONSTITUTION: A non-linear circuit 15 is provided between a pre-amplifier 8 and rectifier 4. Then, the signal of an image pickup tube 5 having been amplified by the pre-amplifier 8 is supplied to a non-linear circuit 15. The circuit 15 is turn so controls the signal as to compress only the level of the video signal corresponding to rear light, etc. Next, the output thereof is rectified by the rectifier 4 and so controls an iris 2 that the output of a differential amplifier 3 becomes of a reference potential. In this way, the over-stopping of the iris at the image pickup of rear light, etc. may be prevented and automatic control to optimum aperture accomplished.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16566278A JPS5587129A (en) | 1978-12-25 | 1978-12-25 | Automatic aperture circuit of lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16566278A JPS5587129A (en) | 1978-12-25 | 1978-12-25 | Automatic aperture circuit of lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5587129A true JPS5587129A (en) | 1980-07-01 |
Family
ID=15816622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16566278A Pending JPS5587129A (en) | 1978-12-25 | 1978-12-25 | Automatic aperture circuit of lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5587129A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999880A (en) * | 1982-11-29 | 1984-06-08 | Canon Inc | Image pickup device |
-
1978
- 1978-12-25 JP JP16566278A patent/JPS5587129A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999880A (en) * | 1982-11-29 | 1984-06-08 | Canon Inc | Image pickup device |
JPH029511B2 (en) * | 1982-11-29 | 1990-03-02 | Canon Kk |
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