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JPS56140771A - Control circuit of high-pressure for cathode-ray tube - Google Patents

Control circuit of high-pressure for cathode-ray tube

Info

Publication number
JPS56140771A
JPS56140771A JP4248080A JP4248080A JPS56140771A JP S56140771 A JPS56140771 A JP S56140771A JP 4248080 A JP4248080 A JP 4248080A JP 4248080 A JP4248080 A JP 4248080A JP S56140771 A JPS56140771 A JP S56140771A
Authority
JP
Japan
Prior art keywords
output
voltage
cathode
ray tube
control circuit
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
Application number
JP4248080A
Other languages
Japanese (ja)
Inventor
Hirotaka Takada
Kuniyoshi Koyama
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP4248080A priority Critical patent/JPS56140771A/en
Publication of JPS56140771A publication Critical patent/JPS56140771A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To obtain a control circuit for high-voltage which is capable of proper control with a small size, high reliability and high accuracy, by detecting the volume of emitted light of a cathode-ray tube and then controlling the operation of a high- voltage generating circuit based on the result obtained by giving a prescribed operation to the output of the above-mentioned detection. CONSTITUTION:The output of an optical detector 1 attached to the cathode-ray tube CRT is applied to the arithmetic control part 3 via an amplifier 2 and then compared with the value obtained by giving a calculation to the current value given from the automatic beam limiter ABL. The output is then converted into e.g. the characteristic curve that is stored previously and through the arithmetic control part 3. Thus a high voltage is stabilized via the errordetecting transistor TR2. On the other hand, the correlation is examined previously between the luminous flux quantity and the X-ray quantity, and the control part 4 stores the limit of allowance for the correlation. Then the X-ray protector PC is actuated by the output of the part 4. In such way, a small-size and accurate high-voltage control circuit can be obtained with high reliability.
JP4248080A 1980-04-01 1980-04-01 Control circuit of high-pressure for cathode-ray tube Pending JPS56140771A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4248080A JPS56140771A (en) 1980-04-01 1980-04-01 Control circuit of high-pressure for cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4248080A JPS56140771A (en) 1980-04-01 1980-04-01 Control circuit of high-pressure for cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS56140771A true JPS56140771A (en) 1981-11-04

Family

ID=12637220

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4248080A Pending JPS56140771A (en) 1980-04-01 1980-04-01 Control circuit of high-pressure for cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS56140771A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882066U (en) * 1981-11-24 1983-06-03 日本ビクター株式会社 Picture tube X-ray radiation suppression circuit
US4829414A (en) * 1986-11-29 1989-05-09 Goldstar Co., Ltd. Circuit for generating a constant high voltage for CRT deflection in response to multi-frequency horizontal sync input signal
EP0535739A2 (en) * 1991-10-01 1993-04-07 Koninklijke Philips Electronics N.V. Method and circuit for limiting CRT X-ray production

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882066U (en) * 1981-11-24 1983-06-03 日本ビクター株式会社 Picture tube X-ray radiation suppression circuit
JPH046305Y2 (en) * 1981-11-24 1992-02-20
US4829414A (en) * 1986-11-29 1989-05-09 Goldstar Co., Ltd. Circuit for generating a constant high voltage for CRT deflection in response to multi-frequency horizontal sync input signal
EP0535739A2 (en) * 1991-10-01 1993-04-07 Koninklijke Philips Electronics N.V. Method and circuit for limiting CRT X-ray production

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