JPS5514790A - Television camera - Google Patents
Television cameraInfo
- Publication number
- JPS5514790A JPS5514790A JP8856878A JP8856878A JPS5514790A JP S5514790 A JPS5514790 A JP S5514790A JP 8856878 A JP8856878 A JP 8856878A JP 8856878 A JP8856878 A JP 8856878A JP S5514790 A JPS5514790 A JP S5514790A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- signal
- fed back
- signal part
- pickup tube
- 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 increase the dynamic range without lowering the picture quality by clipping the minor signal part via the clipping circuit featuring the nonlinear input/output characteristics and then amplifying the major signal part up to such polarity that the positive polarity signal may be fed back to the cathode of the pickup tube.
CONSTITUTION: The output current of target 18 of photoconductive pickup tube 17 is converted to the voltage drop by load resistance 17 the other end of which is connected to target bias voltage source 21 and then amplified through preamplifier 22 to draw out the video signals through terminal 23. At the same time, the minor signal part is clipped and deleted via clipping circuit 24 featuring the non linear input/output characteristics, and the major signal part is amplified up to such polarity that the positive polarity signal may be fed back to cathode 19 of the pickup tube. Then the black level is fixed by clamping circuit 25 when the output signal is zero to be fed back to cathode 19 which is biased to the earth potential via resistance 26. In this way, the dynamic range can be increased without lowering the picture quality.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8856878A JPS5514790A (en) | 1978-07-19 | 1978-07-19 | Television camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8856878A JPS5514790A (en) | 1978-07-19 | 1978-07-19 | Television camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5514790A true JPS5514790A (en) | 1980-02-01 |
Family
ID=13946458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8856878A Pending JPS5514790A (en) | 1978-07-19 | 1978-07-19 | Television camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5514790A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6482861A (en) * | 1987-09-25 | 1989-03-28 | Asahi Optical Co Ltd | Electronic still camera |
-
1978
- 1978-07-19 JP JP8856878A patent/JPS5514790A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6482861A (en) * | 1987-09-25 | 1989-03-28 | Asahi Optical Co Ltd | Electronic still camera |
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