JPS56149866A - Cathode-ray tube focus adjusting device - Google Patents

Cathode-ray tube focus adjusting device

Info

Publication number
JPS56149866A
JPS56149866A JP5335380A JP5335380A JPS56149866A JP S56149866 A JPS56149866 A JP S56149866A JP 5335380 A JP5335380 A JP 5335380A JP 5335380 A JP5335380 A JP 5335380A JP S56149866 A JPS56149866 A JP S56149866A
Authority
JP
Japan
Prior art keywords
pattern
focus
circuit
signal
adjusting
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
JP5335380A
Other languages
Japanese (ja)
Inventor
Shinichi Uno
Riyuuhachirou Douji
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5335380A priority Critical patent/JPS56149866A/en
Publication of JPS56149866A publication Critical patent/JPS56149866A/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 obtain the best focus point by displaying a focus adjusting pattern on the display surface of a CRT, detecting the width of its pattern by a photoelectric converter, and adjusting the focus voltage so as to minimize the pattern width by said detection signal. CONSTITUTION:A focus adjusting pattern signal is generated from the TV electronic circuit 2 and a cross hatch pattern for adjusting the focus is made to reflect on the display surface 1a of the CRT1 by said adjusting pattern signal. The width of this reflected pattern is detected by the photoelectric converter 3X, 3Y, and the detection signals are sent out to the signal processing circuit 4. The detection signals from the converters 3X, 3Y are made binary, respectively, by this circuit 4, the mean value of both signals is derived by a binary signal corresponding to the cross pattern width, and this mean value is made a focus signal, which is input to the control circuit 5. And, a control signal for making the pattern minimum is provided to the focus circuit 6, the circuit 5 is controlled by the output of the circuit 6, to derive the best focus point.
JP5335380A 1980-04-22 1980-04-22 Cathode-ray tube focus adjusting device Pending JPS56149866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5335380A JPS56149866A (en) 1980-04-22 1980-04-22 Cathode-ray tube focus adjusting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5335380A JPS56149866A (en) 1980-04-22 1980-04-22 Cathode-ray tube focus adjusting device

Publications (1)

Publication Number Publication Date
JPS56149866A true JPS56149866A (en) 1981-11-19

Family

ID=12940418

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5335380A Pending JPS56149866A (en) 1980-04-22 1980-04-22 Cathode-ray tube focus adjusting device

Country Status (1)

Country Link
JP (1) JPS56149866A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334681A (en) * 1989-06-30 1991-02-14 Sony Corp Focus detection system and focus adjustor for cathode-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0334681A (en) * 1989-06-30 1991-02-14 Sony Corp Focus detection system and focus adjustor for cathode-ray tube

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