JPS6445046A - Cathode ray tube display - Google Patents

Cathode ray tube display

Info

Publication number
JPS6445046A
JPS6445046A JP63172007A JP17200788A JPS6445046A JP S6445046 A JPS6445046 A JP S6445046A JP 63172007 A JP63172007 A JP 63172007A JP 17200788 A JP17200788 A JP 17200788A JP S6445046 A JPS6445046 A JP S6445046A
Authority
JP
Japan
Prior art keywords
screen
magnetic field
ray tube
deflecting
radiated
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
JP63172007A
Other languages
Japanese (ja)
Other versions
JP2645572B2 (en
Inventor
Furanshisu Hebueshi Jiyosefu
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of JPS6445046A publication Critical patent/JPS6445046A/en
Application granted granted Critical
Publication of JP2645572B2 publication Critical patent/JP2645572B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0015—Preventing or cancelling fields leaving the enclosure

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Soft Magnetic Materials (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Details Of Television Scanning (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

PURPOSE: To lower the undesirable magnetic field, which is radiated to a front surface of a screen, caused by a deflecting coil at a low cost by providing a magnetism shunt means, which is formed of a magnetic permeable ring, between a deflecting coil and a screen of a cathode-ray tube. CONSTITUTION: Deflecting coils 16, 18 generate a variable magnetic field for horizontal scanning, which cross a screen 14, in a cathode-ray tube 12. In the case of concerning two coils in these deflecting coils 16, 18, namely, loops 20, 22, unterminated coil parts 32, 34, 36, 38 of the two loops 20, 22 only form loops, and not work for generating a magnetic field for deflection, and furthermore, they are cause of the generation of undesirable external magnetic field to be radiated to a front surface of the screen 14. The magnetic field radiated to the front surface of the screen can be effectively lowered by providing a magnetism shunt means made of a magnetic permeable ring 50 between the deflecting coils 16, 18 and the screen 14.
JP63172007A 1987-08-13 1988-07-12 Cathode ray tube display Expired - Fee Related JP2645572B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8494987A 1987-08-13 1987-08-13
US84949 1987-08-13

Publications (2)

Publication Number Publication Date
JPS6445046A true JPS6445046A (en) 1989-02-17
JP2645572B2 JP2645572B2 (en) 1997-08-25

Family

ID=22188219

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63172007A Expired - Fee Related JP2645572B2 (en) 1987-08-13 1988-07-12 Cathode ray tube display

Country Status (14)

Country Link
EP (1) EP0302995B1 (en)
JP (1) JP2645572B2 (en)
KR (1) KR930000388B1 (en)
CN (1) CN1021172C (en)
AU (1) AU600158B2 (en)
BR (1) BR8802943A (en)
CA (1) CA1306281C (en)
DE (1) DE3889997T2 (en)
GB (1) GB2208034A (en)
HK (1) HK119794A (en)
IE (1) IE63796B1 (en)
IN (1) IN175123B (en)
MX (1) MX169727B (en)
NZ (1) NZ225468A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02299134A (en) * 1989-03-13 1990-12-11 Internatl Business Mach Corp <Ibm> Cathode ray tube display
US5347366A (en) * 1992-11-10 1994-09-13 Samsung Electron Devices Co., Ltd. Fixation structure of deflection yoke and focus magnet for projection cathode ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1040934C (en) * 1991-07-18 1998-11-25 东芝株式会社 Cathode ray tube device and cathode ray tube image display apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50114230U (en) * 1974-02-28 1975-09-18
JPS60189947U (en) * 1984-05-28 1985-12-16 三菱電機株式会社 electromagnetic deflection yoke

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB743426A (en) * 1953-04-29 1956-01-18 Gen Electric Co Ltd Improvements in or relating to arrangements including cathode ray tubes
NL262281A (en) * 1960-03-17
US3576395A (en) * 1969-05-21 1971-04-27 Sylvania Electric Prod Integral support and magentic shielding means for cathode-ray
NL7609374A (en) * 1976-08-24 1978-02-28 Philips Nv DEVICE FOR DISPLAYING TELEVISION IMAGES, DEVICE COIL SYSTEM FOR SUCH DEVICE AND PICTURE TUBE FITTED WITH SUCH DEFLECTION COIL SYSTEM.
DE3162156D1 (en) * 1980-04-17 1984-03-15 Tokyo Shibaura Electric Co Color picture tube provided with an inner magnetic shield
US4547697A (en) * 1983-07-22 1985-10-15 North American Philips Consumer Electronics Corp. CRT Shunt retaining means
JPS60253135A (en) * 1984-05-28 1985-12-13 Mitsubishi Electric Corp Display device
DK29385A (en) * 1984-10-09 1986-04-10 Viggo Berthelsen PROCEDURE AND APPARATUS FOR ELIMINATING THE POWER FROM A MAGNET FIELD AND PROTECTION AGAINST THE SAME
DE3439808A1 (en) * 1984-10-31 1986-04-30 Standard Elektrik Lorenz Ag, 7000 Stuttgart DEFLECTION SYSTEM FOR COLORED TUBES
US4943755A (en) * 1985-05-20 1990-07-24 Mitsubishi Denki Kabushiki Kaisha Magnetic shielding with constant-current coils for CRT
NL8602397A (en) * 1985-10-25 1987-05-18 Philips Nv IMAGE DISPLAY DEVICE WITH ANTI-DISORDERS.
DE3704648C3 (en) * 1986-02-17 1997-09-18 Murata Manufacturing Co Deflection yoke unit with auxiliary coils to reduce unwanted radiation
JP2611196B2 (en) * 1986-02-20 1997-05-21 日本ビクター株式会社 CRT image display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50114230U (en) * 1974-02-28 1975-09-18
JPS60189947U (en) * 1984-05-28 1985-12-16 三菱電機株式会社 electromagnetic deflection yoke

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02299134A (en) * 1989-03-13 1990-12-11 Internatl Business Mach Corp <Ibm> Cathode ray tube display
US5347366A (en) * 1992-11-10 1994-09-13 Samsung Electron Devices Co., Ltd. Fixation structure of deflection yoke and focus magnet for projection cathode ray tube

Also Published As

Publication number Publication date
KR890004381A (en) 1989-04-21
EP0302995A1 (en) 1989-02-15
MX169727B (en) 1993-07-21
GB2208034A (en) 1989-02-15
CN1031297A (en) 1989-02-22
CA1306281C (en) 1992-08-11
HK119794A (en) 1994-11-11
IE63796B1 (en) 1995-06-14
AU600158B2 (en) 1990-08-02
AU2055588A (en) 1989-02-16
CN1021172C (en) 1993-06-09
IN175123B (en) 1995-04-22
DE3889997T2 (en) 1994-12-01
KR930000388B1 (en) 1993-01-16
IE882459L (en) 1989-02-13
GB8807138D0 (en) 1988-04-27
JP2645572B2 (en) 1997-08-25
BR8802943A (en) 1989-02-21
DE3889997D1 (en) 1994-07-14
NZ225468A (en) 1990-11-27
EP0302995B1 (en) 1994-06-08

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees