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 DEFENSEInfo
- 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
Links
- 230000007123 defense Effects 0.000 title 1
- 230000000266 injurious effect Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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.
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)
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. |
DE68911940T2 (en) * | 1988-02-01 | 1994-06-30 | Philips Nv | Image display device with a compensating coil-equipped, magnetizable core means. |
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 |
US5189348A (en) * | 1989-06-09 | 1993-02-23 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus intended to reduce magnetic fluxes leaked outside the apparatus |
JPH0752631B2 (en) * | 1989-06-09 | 1995-06-05 | 株式会社東芝 | Cathode ray tube device |
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)
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 |
-
1986
- 1986-03-04 SE SE8600991A patent/SE452077C/en not_active IP Right Cessation
-
1987
- 1987-03-03 WO PCT/SE1987/000100 patent/WO1987005437A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO1987005437A1 (en) | 1987-09-11 |
SE8600991L (en) | 1987-09-05 |
SE452077C (en) | 1992-12-07 |
SE452077B (en) | 1987-11-09 |
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