JPS56121021A - Automatic exposure adjusting system of tv camera - Google Patents
Automatic exposure adjusting system of tv cameraInfo
- Publication number
- JPS56121021A JPS56121021A JP2444980A JP2444980A JPS56121021A JP S56121021 A JPS56121021 A JP S56121021A JP 2444980 A JP2444980 A JP 2444980A JP 2444980 A JP2444980 A JP 2444980A JP S56121021 A JPS56121021 A JP S56121021A
- Authority
- JP
- Japan
- Prior art keywords
- reference level
- circuit
- output
- aperture
- peak
- 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
- 230000007423 decrease Effects 0.000 abstract 1
Landscapes
- Exposure Control For Cameras (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
PURPOSE: To prevent a photographic surface from damaging by detecting and comparing the peak value of a picture signal with a prescribed reference level and by reducing the aperture of a lens when the peak value exceeds the reference level.
CONSTITUTION: The 1st reference level VA1 is outptted from reference level generating circuit 12 as reference level (i) for lens aperture adjustement and diaphragm 2 is settled properly. If an extremely sharp and bright light spot, such as a bright spot, appears in the photographic screen and the peack of output (c) of preamplifying circuit 6 exceeds upper-limit reference level Vr1, output (d) of peak detecting circuit 13 and output (e) of sample holding circuit 15 exceed reference level Vr1 and output (f) of the 1st comparing circuit 16 is inverted from HWL. Consequently, FF18 is set to change-over reference level (i) into the 2nd reference level VA2 lower than level VA1, and diaphragm controlling circuit 10 decreases the aperture diameter of aperture 2. Thus, the damage of photographic screen depending upon the peak of the picture signal can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2444980A JPS56121021A (en) | 1980-02-28 | 1980-02-28 | Automatic exposure adjusting system of tv camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2444980A JPS56121021A (en) | 1980-02-28 | 1980-02-28 | Automatic exposure adjusting system of tv camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56121021A true JPS56121021A (en) | 1981-09-22 |
Family
ID=12138457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2444980A Pending JPS56121021A (en) | 1980-02-28 | 1980-02-28 | Automatic exposure adjusting system of tv camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56121021A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172885A (en) * | 1983-03-22 | 1984-09-29 | Canon Inc | Image pickup device |
| JPS6076723A (en) * | 1983-10-03 | 1985-05-01 | Olympus Optical Co Ltd | Automatic dimming device for image sensing |
| JPH05228458A (en) * | 1992-02-19 | 1993-09-07 | Toyo Eng Works Ltd | Fermentative digestion method and digestion tank for organic matter using the method |
-
1980
- 1980-02-28 JP JP2444980A patent/JPS56121021A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59172885A (en) * | 1983-03-22 | 1984-09-29 | Canon Inc | Image pickup device |
| JPH0566792B2 (en) * | 1983-03-22 | 1993-09-22 | Canon Kk | |
| JPS6076723A (en) * | 1983-10-03 | 1985-05-01 | Olympus Optical Co Ltd | Automatic dimming device for image sensing |
| JPH05228458A (en) * | 1992-02-19 | 1993-09-07 | Toyo Eng Works Ltd | Fermentative digestion method and digestion tank for organic matter using the method |
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