JPS6454882A - X-ray protection circuit for projection tv - Google Patents
X-ray protection circuit for projection tvInfo
- Publication number
- JPS6454882A JPS6454882A JP62210048A JP21004887A JPS6454882A JP S6454882 A JPS6454882 A JP S6454882A JP 62210048 A JP62210048 A JP 62210048A JP 21004887 A JP21004887 A JP 21004887A JP S6454882 A JPS6454882 A JP S6454882A
- Authority
- JP
- Japan
- Prior art keywords
- braun tube
- braun
- stopping
- horizontal
- vertical 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.)
- Granted
Links
Landscapes
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
PURPOSE:To prevent beams from concentrating upon one point of a Braun tube so as to burn the fluorescent surface of the Braun tube by stopping the operation of horizontal and vertical deflection, after holding the Braun tube at a black level at first, when X-ray protecting operation is performed. CONSTITUTION:In a projection TV of a system that three Braun tubes to emit three primary colors of red, green and blue are used and a picture is projected on a large picture frame, when abnormality occurs in a TV set and the operation of the horizontal and the vertical deflection and the operation of a high voltage generation circuit are stopped, stopping operation is preformed after stopping the beam current of the Braun tube. In such a way, after keeping the Braun tube at the black level at first, the horizontal and the vertical deflection operation is stopped. Thus, a trouble that luminescent spots concentrate upon one point of the Braun tube and the Braun tube is burnt can be surely prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62210048A JPH0687585B2 (en) | 1987-08-26 | 1987-08-26 | X-ray protection circuit for projection TV |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62210048A JPH0687585B2 (en) | 1987-08-26 | 1987-08-26 | X-ray protection circuit for projection TV |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6454882A true JPS6454882A (en) | 1989-03-02 |
JPH0687585B2 JPH0687585B2 (en) | 1994-11-02 |
Family
ID=16582940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62210048A Expired - Lifetime JPH0687585B2 (en) | 1987-08-26 | 1987-08-26 | X-ray protection circuit for projection TV |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0687585B2 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5578677A (en) * | 1978-12-08 | 1980-06-13 | Matsushita Electric Ind Co Ltd | Cathode-ray tube protective device |
JPS55100370U (en) * | 1978-12-29 | 1980-07-12 | ||
JPS5622860U (en) * | 1979-07-27 | 1981-02-28 | ||
JPS60204179A (en) * | 1984-02-29 | 1985-10-15 | ブラウプンクト‐ヴエルケ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Circuit device for video receiving tube |
JPS61264868A (en) * | 1985-05-17 | 1986-11-22 | Mitsubishi Electric Corp | Protecting device for cathode ray tube |
JPS6276971A (en) * | 1985-09-30 | 1987-04-09 | Nec Home Electronics Ltd | Blanking circuit for television receiver capable of horizontal deflection frequency changing-over |
JPS637857U (en) * | 1986-07-02 | 1988-01-19 |
-
1987
- 1987-08-26 JP JP62210048A patent/JPH0687585B2/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5578677A (en) * | 1978-12-08 | 1980-06-13 | Matsushita Electric Ind Co Ltd | Cathode-ray tube protective device |
JPS55100370U (en) * | 1978-12-29 | 1980-07-12 | ||
JPS5622860U (en) * | 1979-07-27 | 1981-02-28 | ||
JPS60204179A (en) * | 1984-02-29 | 1985-10-15 | ブラウプンクト‐ヴエルケ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Circuit device for video receiving tube |
JPS61264868A (en) * | 1985-05-17 | 1986-11-22 | Mitsubishi Electric Corp | Protecting device for cathode ray tube |
JPS6276971A (en) * | 1985-09-30 | 1987-04-09 | Nec Home Electronics Ltd | Blanking circuit for television receiver capable of horizontal deflection frequency changing-over |
JPS637857U (en) * | 1986-07-02 | 1988-01-19 |
Also Published As
Publication number | Publication date |
---|---|
JPH0687585B2 (en) | 1994-11-02 |
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