JPS57188181A - Automatic stop device for television camera - Google Patents
Automatic stop device for television cameraInfo
- Publication number
- JPS57188181A JPS57188181A JP56072885A JP7288581A JPS57188181A JP S57188181 A JPS57188181 A JP S57188181A JP 56072885 A JP56072885 A JP 56072885A JP 7288581 A JP7288581 A JP 7288581A JP S57188181 A JPS57188181 A JP S57188181A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- aperture
- circuit
- capacitor
- supply voltage
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To close an aperture without exception after the disconnection of a power supply, by additionally providing a capacitor charged from a power supply voltage when current is flowed and a circuit to close the aperture through the amount of charge of the capacitor at the interruption of power supply. CONSTITUTION:In a monitor TV camera, a capacitor 6 is charged with a power supply voltage from a terminal A during the usage. If the power supply is interrupted, it is detected with a circuit 7 which generates an aperture stop signal by using a photocoupler or the like, and a signal closing the aperture the same as high luminance through the charge in a cpacitor 6 is applied to a level adjusting circuit 2. Simultaneously, a backup voltage corresponding to the power supply voltage from a terminal B is applied to a level adjusting circuit 2 to keep each circuit at an operation state and the aperture wings of an aperture switching circuit 4 are rapidly driven toward the closing direction the same as at high luminance. Thus, the aperture can automatically be stopped through the interruption of the power supply in any state, allowing to minimize the deterioration of a pickup tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072885A JPS57188181A (en) | 1981-05-16 | 1981-05-16 | Automatic stop device for television camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072885A JPS57188181A (en) | 1981-05-16 | 1981-05-16 | Automatic stop device for television camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57188181A true JPS57188181A (en) | 1982-11-19 |
Family
ID=13502231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56072885A Pending JPS57188181A (en) | 1981-05-16 | 1981-05-16 | Automatic stop device for television camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57188181A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01139684U (en) * | 1988-03-17 | 1989-09-25 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5528626A (en) * | 1978-08-23 | 1980-02-29 | Hitachi Denshi Ltd | Lens iris control system |
-
1981
- 1981-05-16 JP JP56072885A patent/JPS57188181A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5528626A (en) * | 1978-08-23 | 1980-02-29 | Hitachi Denshi Ltd | Lens iris control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01139684U (en) * | 1988-03-17 | 1989-09-25 |
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