SE8600991D0 - DEVICE FOR REDUCING MAGNETIC FIELD STRENGTH NEAR APPLIANCES WITH CATHODIC RADIATORS WITH MAGNETIC DEFENSE - Google Patents

DEVICE FOR REDUCING MAGNETIC FIELD STRENGTH NEAR APPLIANCES WITH CATHODIC RADIATORS WITH MAGNETIC DEFENSE

Info

Publication number
SE8600991D0
SE8600991D0 SE8600991A SE8600991A SE8600991D0 SE 8600991 D0 SE8600991 D0 SE 8600991D0 SE 8600991 A SE8600991 A SE 8600991A SE 8600991 A SE8600991 A SE 8600991A SE 8600991 D0 SE8600991 D0 SE 8600991D0
Authority
SE
Sweden
Prior art keywords
field
radiators
cathodic
field strength
magnetic field
Prior art date
Application number
SE8600991A
Other languages
Swedish (sv)
Other versions
SE452077C (en
SE8600991L (en
SE452077B (en
Inventor
S Blixt
Original Assignee
Versal Ab
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 Versal Ab filed Critical Versal Ab
Priority to SE8600991A priority Critical patent/SE452077C/en
Publication of SE8600991D0 publication Critical patent/SE8600991D0/en
Priority to PCT/SE1987/000100 priority patent/WO1987005437A1/en
Publication of SE8600991L publication Critical patent/SE8600991L/en
Priority to NO874535A priority patent/NO174079C/en
Priority to DK576287A priority patent/DK576287A/en
Publication of SE452077B publication Critical patent/SE452077B/en
Publication of SE452077C publication Critical patent/SE452077C/en

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
    • H01J29/003—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
    • 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
    • H01J2229/003—Preventing or cancelling fields entering the enclosure

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

Apparatus of the type picture screen terminals and the like comprising a cathode ray tube (CRT) operating with electromagnetic deflection of the electron ray. In an area in front of the screen (2) there appears a leakage field (BL/D) from the deflection assembly (4) the presence of which is considered injurious to the health of persons within the area. The invention indicates a solution of the problem of how to suppress this field by means of a compensating field (BC) in such a way that the compensation field does not generate a disturbing field intensity on other sides of the apparatus. This is achieved by means of windings (7, 8) generating the compensating field (BC) and located in or near the plane of screen (2). The two fields shall be mutually antiparallel, synchronous and have substantially the same field intensity.
SE8600991A 1986-03-04 1986-03-04 DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN SE452077C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE8600991A SE452077C (en) 1986-03-04 1986-03-04 DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN
PCT/SE1987/000100 WO1987005437A1 (en) 1986-03-04 1987-03-03 A device for the suppression of leakage fields in front of viewing screens and the like
NO874535A NO174079C (en) 1986-03-04 1987-10-30 Device for suppressing leakage fields in front of displays and the like
DK576287A DK576287A (en) 1986-03-04 1987-11-03 DEVICE PREVENTION DISPLAY FRONT SCREENS AND LIKE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8600991A SE452077C (en) 1986-03-04 1986-03-04 DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN

Publications (4)

Publication Number Publication Date
SE8600991D0 true SE8600991D0 (en) 1986-03-04
SE8600991L SE8600991L (en) 1987-09-05
SE452077B SE452077B (en) 1987-11-09
SE452077C SE452077C (en) 1992-12-07

Family

ID=20363690

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8600991A SE452077C (en) 1986-03-04 1986-03-04 DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN

Country Status (2)

Country Link
SE (1) SE452077C (en)
WO (1) WO1987005437A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8700449A (en) * 1987-02-24 1988-09-16 Philips Nv IMAGE DISPLAY DEVICE WITH MEANS FOR COMPENSATING LINE SPRAY FIELDS.
EP0327161B1 (en) * 1988-02-01 1994-01-05 Koninklijke Philips Electronics N.V. Picture display device with magnetizable core means comprising compensation coils
GB8806230D0 (en) * 1988-03-16 1988-04-13 Vistek Electronics Ltd Display arrangement
JPH027334A (en) * 1988-06-24 1990-01-11 Victor Co Of Japan Ltd Leakage flux reduction device
EP0348571A1 (en) * 1988-06-30 1990-01-03 International Business Machines Corporation Cathode ray tube display monitor with stray magnetic field compensation
NO165698C (en) * 1988-07-05 1991-03-20 System Sikkerhet As DIGITAL EQUIPMENT PROTECTION SYSTEM.
GB2223649A (en) * 1988-07-27 1990-04-11 Peter Thompson Wright A screen for an electromagnetic field
US5200673A (en) * 1988-10-31 1993-04-06 Victor Company Of Japan, Ltd. Method and device for suppression of leakage of magnetic flux in display apparatus
JPH0752631B2 (en) * 1989-06-09 1995-06-05 株式会社東芝 Cathode ray tube device
US5189348A (en) * 1989-06-09 1993-02-23 Kabushiki Kaisha Toshiba Cathode ray tube apparatus intended to reduce magnetic fluxes leaked outside the apparatus
FI87127C (en) * 1991-04-15 1992-11-25 Imatran Voima Oy Method for reducing distance dependent voltage rise in parallel high frequency electrodes
JP3121089B2 (en) * 1992-01-17 2000-12-25 株式会社日立製作所 Deflection yoke
DE4203828C2 (en) * 1992-02-10 1996-03-14 Siemens Nixdorf Inf Syst Monitor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2227029A (en) * 1937-02-05 1940-12-31 Loewe Radio Inc Elimination of the magnetic dispersion of transformers
NL266290A (en) * 1960-06-24
JPS5137393Y2 (en) * 1971-10-28 1976-09-13
DE2705515C2 (en) * 1977-02-10 1985-11-21 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Image display device with a picture tube and a mains transformer
DE3017331A1 (en) * 1980-05-06 1981-11-12 Siemens AG, 1000 Berlin und 8000 München ARRANGEMENT FOR COMPENSATING FOR MAGNETIC FOREIGN INTERFERENCE ON COLOR TV TELEVISIONS

Also Published As

Publication number Publication date
WO1987005437A1 (en) 1987-09-11
SE452077C (en) 1992-12-07
SE8600991L (en) 1987-09-05
SE452077B (en) 1987-11-09

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