JPS57145253A - Electron beam focusing device of crt - Google Patents

Electron beam focusing device of crt

Info

Publication number
JPS57145253A
JPS57145253A JP3080581A JP3080581A JPS57145253A JP S57145253 A JPS57145253 A JP S57145253A JP 3080581 A JP3080581 A JP 3080581A JP 3080581 A JP3080581 A JP 3080581A JP S57145253 A JPS57145253 A JP S57145253A
Authority
JP
Japan
Prior art keywords
fluctuation
focusing device
crt
acceleration voltage
electron beam
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
JP3080581A
Other languages
Japanese (ja)
Inventor
Shunichi Kishimoto
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP3080581A priority Critical patent/JPS57145253A/en
Publication of JPS57145253A publication Critical patent/JPS57145253A/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
    • H04N3/24—Blanking circuits

Abstract

PURPOSE:To correct blooming causing by the fluctuation of an acceleration voltage by detecting the fluctuation of the acceleration voltage and controlling current flowing to an electromagnetic focusing coil. CONSTITUTION:A static main focusing device 11 comprising a permanent magnet and a dynamic auxiliary focusing device 12 comprising a ring coil are installed in a neck 4 of a CRT 1 in which an electron gun 5 and a deflection york 6 are mounted. Fluctuation of an output current of a high voltage generation circuit 20 which supplies an acceleration voltage to an anode electrode 3 of the CRT 1 is detected with a high voltage fluctuation detecting circuit 21, and amplified with a current control amplification circuit 30 to supply to the auxiliary focusing device 12. Therefore, increase of an electron beam diameter causing by fluctuation of the acceleration voltage is suppressed and kept almost constant.
JP3080581A 1981-03-03 1981-03-03 Electron beam focusing device of crt Pending JPS57145253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3080581A JPS57145253A (en) 1981-03-03 1981-03-03 Electron beam focusing device of crt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3080581A JPS57145253A (en) 1981-03-03 1981-03-03 Electron beam focusing device of crt

Publications (1)

Publication Number Publication Date
JPS57145253A true JPS57145253A (en) 1982-09-08

Family

ID=12313891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3080581A Pending JPS57145253A (en) 1981-03-03 1981-03-03 Electron beam focusing device of crt

Country Status (1)

Country Link
JP (1) JPS57145253A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61112478A (en) * 1984-11-07 1986-05-30 Victor Co Of Japan Ltd Driving device of electromagnetic focusing type image pickup tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4820317B1 (en) * 1970-08-17 1973-06-20
JPS494573A (en) * 1972-04-24 1974-01-16
JPS5131399A (en) * 1974-09-11 1976-03-17 Doryokuro Kakunenryo Hoshaseihaijukyobai no gerujokokaho
JPS545373A (en) * 1977-06-15 1979-01-16 Hitachi Ltd Projection-type cathode-ray tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4820317B1 (en) * 1970-08-17 1973-06-20
JPS494573A (en) * 1972-04-24 1974-01-16
JPS5131399A (en) * 1974-09-11 1976-03-17 Doryokuro Kakunenryo Hoshaseihaijukyobai no gerujokokaho
JPS545373A (en) * 1977-06-15 1979-01-16 Hitachi Ltd Projection-type cathode-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61112478A (en) * 1984-11-07 1986-05-30 Victor Co Of Japan Ltd Driving device of electromagnetic focusing type image pickup tube

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