JPH0110053Y2 - - Google Patents
Info
- Publication number
- JPH0110053Y2 JPH0110053Y2 JP11449081U JP11449081U JPH0110053Y2 JP H0110053 Y2 JPH0110053 Y2 JP H0110053Y2 JP 11449081 U JP11449081 U JP 11449081U JP 11449081 U JP11449081 U JP 11449081U JP H0110053 Y2 JPH0110053 Y2 JP H0110053Y2
- Authority
- JP
- Japan
- Prior art keywords
- image pickup
- circuit
- pickup tube
- target voltage
- deflection
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 1
Description
【考案の詳細な説明】
本考案は、テレビジヨンカメラの撮像管ターゲ
ツト焼付防止に関するものである。[Detailed Description of the Invention] The present invention relates to prevention of image pickup tube target burn-in of a television camera.
最近の家庭用テレビジヨンカメラは、電子ビユ
ーフアインダーが内蔵され、かつ小形化が要求さ
れている。この小形化の一方法として、撮像管と
電子ビユーフアインダー（以下「EVF」と略称
する）の偏向を一体化する方法が考案され実用化
されている。 Recent home television cameras have built-in electronic viewfinders and are required to be smaller. As one method of miniaturization, a method has been devised and put into practical use that integrates the deflection of an image pickup tube and an electronic view finder (hereinafter abbreviated as "EVF").
このシステムを第１図に示す。第１図におい
て、１は撮像管、２は撮像管偏向コイル、３は
EVF、４はEVF偏向コイル、５は同期分離回路、
６はカメラ基準信号発生器（以下「SSG」と略称
する）、７は検出回路、８は偏向回路、９はター
ゲツト電圧発生回路、１０は同期信号切換回路で
ある。 This system is shown in FIG. In Fig. 1, 1 is an image pickup tube, 2 is an image pickup tube deflection coil, and 3 is an image pickup tube.
EVF, 4 is EVF deflection coil, 5 is synchronous separation circuit,
6 is a camera standard signal generator (hereinafter abbreviated as "SSG"), 7 is a detection circuit, 8 is a deflection circuit, 9 is a target voltage generation circuit, and 10 is a synchronization signal switching circuit.
第１図に示すシステムの動作を説明すると、通
常運用時には、切換回路１０がSSG６側に接続さ
れ撮像管１とEVF３が動作している。このとき、
撮像管１にはターゲツト電圧発生回路９を介して
約30ボルトのターゲツト電圧が供給される。 To explain the operation of the system shown in FIG. 1, during normal operation, the switching circuit 10 is connected to the SSG 6 side and the image pickup tube 1 and EVF 3 are operated. At this time,
A target voltage of approximately 30 volts is supplied to the image pickup tube 1 via a target voltage generating circuit 9.
次に、VTR側からプレイバツク信号PBSが供
給されたときを考える。このときは検出回路７に
より切換回路１０が制御され、偏向回路８は同期
分離回路５の出力信号によつて動作する。このと
き撮像管１は偏向のみ動作し、その他の信号は、
SSG６の出力信号によつて制御されている。した
がつて、撮像管１の偏向タイミングとビームブラ
ンキングのタイミング（B.BL）が一致せず、焼
きつきを発生する恐れがある。 Next, consider the case where the playback signal PBS is supplied from the VTR side. At this time, the switching circuit 10 is controlled by the detection circuit 7, and the deflection circuit 8 is operated by the output signal of the synchronous separation circuit 5. At this time, the image pickup tube 1 operates only for deflection, and the other signals are
It is controlled by the output signal of SSG6. Therefore, the deflection timing of the image pickup tube 1 and the beam blanking timing (B.BL) do not match, which may cause burn-in.
本考案は、前記欠点を除去するためになされた
ものであり、その特徴は、VTR再生時あるいは
再生から撮像に移る過程で発生する撮像管のター
ゲツト焼付防止のためにターゲツト電圧を制御す
る手段を備えたことにある。 The present invention was developed to eliminate the above-mentioned drawbacks, and its feature is that it includes a means for controlling the target voltage to prevent target burn-in on the image pickup tube that occurs during VTR playback or during the transition from playback to imaging. It's about being prepared.
以下、実施例により本考案を詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
第２図は、本考案の一実施例の回路構成を示す
図であり、第１図と同一のものは同一記号を付け
てある。 FIG. 2 is a diagram showing the circuit configuration of an embodiment of the present invention, and the same parts as in FIG. 1 are given the same symbols.
第２図に示す本実施例は、第１図の検出回路７
の出力によつて制御されるコントロール回路１１
を設け、ターゲツト電圧発生回路９のターゲツト
電圧を制御するようにしたものである。すなわ
ち、VTRプレイバツク信号PBSが入力したとき、
検出回路７により切換回路１０が制御されると同
時に、コントロール回路１１が制御され、ターゲ
ツト電圧発生回路９のターゲツト電圧を低レベル
（実際には約０ボルト）にし、ビームがターゲツ
ト膜に到達しないようにしてターゲツトの焼付を
防止する。 The present embodiment shown in FIG. 2 is based on the detection circuit 7 shown in FIG.
A control circuit 11 controlled by the output of
is provided to control the target voltage of the target voltage generating circuit 9. In other words, when the VTR playback signal PBS is input,
At the same time as the switching circuit 10 is controlled by the detection circuit 7, the control circuit 11 is controlled to set the target voltage of the target voltage generation circuit 9 to a low level (actually about 0 volts) to prevent the beam from reaching the target film. to prevent target burn-in.
以上説明したごとく、本考案によれば、電子ビ
ユーフアインダー内蔵型テレビジヨンカメラにお
いても、VTR再生時あるいは再生から撮像に移
る過程で発生する撮像管のターゲツト焼付を防止
することができる。 As explained above, according to the present invention, even in a television camera with a built-in electronic viewfinder, it is possible to prevent target burn-in on the image pickup tube that occurs during VTR playback or during the transition from playback to imaging.
第１図は、従来の電子ビユーフアインダーが内
蔵され、この電子ビユーフアインダーと撮像管の
偏向回路が共用化されたカラーテレビジヨンカメ
ラシステムのブロツク構成図、第２図は、本考案
の一実施例のブロツク構成図である。
１……撮像管、２……撮像管偏向コイル、３…
…EVF、４……EVF偏向コイル、５……同期分
離回路、６……SSG、７……検出回路、８……偏
向回路、９……ターゲツト電圧発生回路、１０…
…同期信号切換回路、１１……コントロール回
路。
Fig. 1 is a block diagram of a color television camera system in which a conventional electronic viewfinder is built in and the deflection circuit of the image pickup tube is shared with the electronic viewfinder, and Fig. 2 is an embodiment of the present invention. FIG. 1... Image pickup tube, 2... Image pickup tube deflection coil, 3...
...EVF, 4...EVF deflection coil, 5...Synchronization separation circuit, 6...SSG, 7...Detection circuit, 8...Deflection circuit, 9...Target voltage generation circuit, 10...
...Synchronization signal switching circuit, 11...Control circuit.
Claims (1)
共用化した電子ビユーフアインダー内蔵型テレビ
ジヨンカメラにおいて、VTR再生信号検出時、
これに連動して、撮像管に供給されるターゲツト
電圧をほぼOVに制御する手段を備えたことを特
徴とするテレビジヨンカメラ。 In a television camera with a built-in electronic viewfinder that shares the electronic viewfinder and image pickup tube deflection circuit, when a VTR playback signal is detected,
A television camera characterized in that it is equipped with means for controlling the target voltage supplied to the image pickup tube to approximately OV in conjunction with this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11449081U JPS5823461U (en) | 1981-08-03 | 1981-08-03 | tv jiyoung camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11449081U JPS5823461U (en) | 1981-08-03 | 1981-08-03 | tv jiyoung camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5823461U JPS5823461U (en) | 1983-02-14 |
| JPH0110053Y2 true JPH0110053Y2 (en) | 1989-03-22 |
Family
ID=29908766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11449081U Granted JPS5823461U (en) | 1981-08-03 | 1981-08-03 | tv jiyoung camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5823461U (en) |
-
1981
- 1981-08-03 JP JP11449081U patent/JPS5823461U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5823461U (en) | 1983-02-14 |
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