JPS6454882A - X-ray protection circuit for projection tv - Google Patents

X-ray protection circuit for projection tv

Info

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
Application number
JP62210048A
Other languages
Japanese (ja)
Other versions
JPH0687585B2 (en
Inventor
Katsunobu Takeda
Toshiaki Ogasawara
Nobuaki Naoi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62210048A priority Critical patent/JPH0687585B2/en
Publication of JPS6454882A publication Critical patent/JPS6454882A/en
Publication of JPH0687585B2 publication Critical patent/JPH0687585B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62210048A 1987-08-26 1987-08-26 X-ray protection circuit for projection TV Expired - Lifetime JPH0687585B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
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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