JPS572167A - Focus compensating circuit - Google Patents

Focus compensating circuit

Info

Publication number
JPS572167A
JPS572167A JP7425680A JP7425680A JPS572167A JP S572167 A JPS572167 A JP S572167A JP 7425680 A JP7425680 A JP 7425680A JP 7425680 A JP7425680 A JP 7425680A JP S572167 A JPS572167 A JP S572167A
Authority
JP
Japan
Prior art keywords
picture
circuit
focus
focus voltage
always
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
JP7425680A
Other languages
Japanese (ja)
Inventor
Takaharu Kubota
Junji Nomura
Atsushi Awanaka
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 JP7425680A priority Critical patent/JPS572167A/en
Publication of JPS572167A publication Critical patent/JPS572167A/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
    • H04N3/26—Modifications of scanning arrangements to improve focusing

Landscapes

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

Abstract

PURPOSE:To ensure an optimum focus state at all time and thus always obtain a high-contrast picture, by installing a circuit that supplies a control signal varying according to the contents of picture to a focus voltage setting means of a CRT. CONSTITUTION:The focus voltage is supplied to the CRT of a TV picture receiver from a focus terminal 3 of a focus voltage control circuit. A circuit consisting of a transistor (TR)5 which amplifies the signal sent from a video signal amplifying circuit 7 plus a transformer 4 is provided to the said control circuit. Then the output amplified by this circuit is applied to the terminal 3 via a capacitor 10. The focus voltage is applied toward the reducing direction with a bright screen according to the contents of picture. Thus the focus voltage is always controlled automatically at an optimum level always to obtain a high-contrast picture.
JP7425680A 1980-06-04 1980-06-04 Focus compensating circuit Pending JPS572167A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7425680A JPS572167A (en) 1980-06-04 1980-06-04 Focus compensating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7425680A JPS572167A (en) 1980-06-04 1980-06-04 Focus compensating circuit

Publications (1)

Publication Number Publication Date
JPS572167A true JPS572167A (en) 1982-01-07

Family

ID=13541881

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7425680A Pending JPS572167A (en) 1980-06-04 1980-06-04 Focus compensating circuit

Country Status (1)

Country Link
JP (1) JPS572167A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6242373U (en) * 1985-08-30 1987-03-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6242373U (en) * 1985-08-30 1987-03-13

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