JPS5772471A - Driving device for cathode-ray tube - Google Patents

Driving device for cathode-ray tube

Info

Publication number
JPS5772471A
JPS5772471A JP14695080A JP14695080A JPS5772471A JP S5772471 A JPS5772471 A JP S5772471A JP 14695080 A JP14695080 A JP 14695080A JP 14695080 A JP14695080 A JP 14695080A JP S5772471 A JPS5772471 A JP S5772471A
Authority
JP
Japan
Prior art keywords
voltage
supplied
transformer
change
grid electrode
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
JP14695080A
Other languages
Japanese (ja)
Other versions
JPS639714B2 (en
Inventor
Norio Suzuki
Hideo Eya
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 JP14695080A priority Critical patent/JPS5772471A/en
Publication of JPS5772471A publication Critical patent/JPS5772471A/en
Publication of JPS639714B2 publication Critical patent/JPS639714B2/ja
Granted 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
    • H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To protect circuits connected to respective electrodes, by detecting the lowering of voltages of several electrodes except the first grid electrode out of grid electrodes of a CRT to cut off the supply of the power source voltage. CONSTITUTION:When the position side voltage of the second grid electrode 5 is changed in accordance with making of a power supply switch, this change is supplied to a pulse transformer 8 through a capacitor 9. Meanwhile, since the output of the capacitor 9 due to the change of the positive side voltage is flowed to the earth by a diode 10 connected in parallel to the primary side of the transformer 8, the transformer 8 is not influenced at all. The change of the negative side voltage of the second grid electrode is supplied to a primary winding 8a of the transformer 8 to raise the voltage waveform at a point B which is obtained by rectifying the output of a secondary winding 8b by a diode 11. The voltage at the point B is generated at both ends of a resistance 12 and is supplied to a voltage control circuit 13, and a low-potential voltage is supplied from the circuit 13 to a power supply device. Thus, the supply of the power source is cut off.
JP14695080A 1980-10-22 1980-10-22 Driving device for cathode-ray tube Granted JPS5772471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14695080A JPS5772471A (en) 1980-10-22 1980-10-22 Driving device for cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14695080A JPS5772471A (en) 1980-10-22 1980-10-22 Driving device for cathode-ray tube

Publications (2)

Publication Number Publication Date
JPS5772471A true JPS5772471A (en) 1982-05-06
JPS639714B2 JPS639714B2 (en) 1988-03-01

Family

ID=15419233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14695080A Granted JPS5772471A (en) 1980-10-22 1980-10-22 Driving device for cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS5772471A (en)

Also Published As

Publication number Publication date
JPS639714B2 (en) 1988-03-01

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