EP0314671A1 - Device for limiting the magnetic emission in cathode ray tube monitors - Google Patents
Device for limiting the magnetic emission in cathode ray tube monitorsInfo
- Publication number
- EP0314671A1 EP0314671A1 EP19870901618 EP87901618A EP0314671A1 EP 0314671 A1 EP0314671 A1 EP 0314671A1 EP 19870901618 EP19870901618 EP 19870901618 EP 87901618 A EP87901618 A EP 87901618A EP 0314671 A1 EP0314671 A1 EP 0314671A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic field
- magnetic
- bobbins
- limiting
- catho
- 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.)
- Withdrawn
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
Definitions
- the invention refers to a proceeding which can be employed with de vices using cathodic ray tubes, which enables to theorically annul the emission of low frequency magnetic rays, without thus injuring the health of the persons.
- the invention device carries out an ad ⁇ aptation of an already existing one; consequently, the above form of elaboration is in connection with the shape of the device to which it must be suited and acts on it as a limiting device for the issue of low frequency magnetic radiations.
- the investigations carried out in this connection have ascertained that such radiations are noxious to the human body, and particular ⁇ ly to pregnant women. It is well known, moreover, that the farmful- ness of the magnetic fields is mostly due to the deflection yoke, which beside giving rise to inside magnetic field essential for the deflection itself, dispels an unwished magnetic radiation outside the monitor.
- the invention device allows the solution of this problem through a proper means suited to the present devices in order to create a ir gnetic field exactly opposite to the disturbing one, thus annull- ing the noxious radiation.
- the device is foreseen with 3O or more windings of copper conducting wire itted near the deflexion yoke through which the current causing the deflection is passing and its shape is such to create a magnetic field configu ration as like as possible and opposite to the unwished one.
- a dra- stic reduction thus results of the magnetic field issued outwards from the device.
- An elementarized scheme of the invention applied to a conventional deflection yoke is schematically illustrated in fig. 1 of table 1.
- the deflexion yoke is schematically consisting of the coils 1 , 2, 3 and 4 through which the relevant currents are passing after hav ⁇ ing been generated by the circuits of the monitor or T.V. receiver.
- the four compensating coils 7, 8, 9 and 10 are foreseen in se_ ries connection with the relevant coils 1, 2, 3 and 4, and coiled in such sense and shape to annul the magnetic field outside the cathodic ray pipe 11.
- the compensation coils 8 and 10 in the same instant will produce a magne tic field with the polarity shown in the same figure, which will com pensate the magnetic fields produced by the coils 4 and 2, thus annul], ing, or at least reducing, the magnetic field outside the system it ⁇ self.
- the invention foresees the change of the compensation reel number; moreover the connexion type of the compensation coils may change in respect to the main coils, thus determining, for instance, sche mes in series, in parallel or others.
- the position in the space of the compensation bobbins may change.
- the said spools can also be coiled on a support in either iron-magnetic material or not.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Le dispositif décrit est conçu avec au moins deux enroulements de fil conducteur en cuivre (7, 8, 9 et 10), qui est placé près du collier de déviation (1, 2, 3 et 4) à travers lequel passe le courant responsable de cette même déviation et dont la forme est conçue de façon à former une configuration de champ magnétique aussi similaire que possible et contraire à la configuration non désirée. Une réduction très prononcée du champ magnétique émis par l'extérieur du dispositif est ainsi obtenue.The device described is designed with at least two windings of copper conductive wire (7, 8, 9 and 10), which is placed near the deflection collar (1, 2, 3 and 4) through which the current responsible for this same deviation and whose shape is designed so as to form a magnetic field configuration as similar as possible and contrary to the unwanted configuration. A very pronounced reduction in the magnetic field emitted by the exterior of the device is thus obtained.
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT1987/000017 WO1988006346A1 (en) | 1987-02-19 | 1987-02-19 | Device for limiting the magnetic emission in cathode ray tube monitors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0314671A1 true EP0314671A1 (en) | 1989-05-10 |
Family
ID=11330715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870901618 Withdrawn EP0314671A1 (en) | 1987-02-19 | 1987-02-19 | Device for limiting the magnetic emission in cathode ray tube monitors |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0314671A1 (en) |
WO (1) | WO1988006346A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2223649A (en) * | 1988-07-27 | 1990-04-11 | Peter Thompson Wright | A screen for an electromagnetic field |
MY107095A (en) * | 1989-03-13 | 1995-09-30 | Ibm | Magnetic shunt for defletion yokes. |
EP0568783B1 (en) * | 1992-05-08 | 1998-09-23 | Hitachi, Ltd. | Cathode-ray tube apparatus and yoke |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
IN167955B (en) * | 1986-03-27 | 1991-01-12 | Nokia Data Systems |
-
1987
- 1987-02-19 WO PCT/IT1987/000017 patent/WO1988006346A1/en not_active Application Discontinuation
- 1987-02-19 EP EP19870901618 patent/EP0314671A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8806346A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1988006346A1 (en) | 1988-08-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19890217 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI NL SE |
|
17Q | First examination report despatched |
Effective date: 19910228 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19910911 |