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(11) | EP 0 348 205 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Device for suppression of leakage of magnetic flux in display apparatus |
(57) There is disclosed a device for suppression of leakage flux from a deflecting yoke,
which is assembled in a display apparatus having a cathode ray tube (a CRT) for displaying
an image by radiation of an electron beam from an electron gun to a fluorescent display
surface, and the deflecting yoke having some coils arranged at a rear portion of the
CRT and for deflecting the electron beam. The device comprises two cancelling wires
(5a, 5b) which are disposed at the inner sides of upper and lower ends in front of
the CRT and connected in parallel for generating cancellation flux to negate the leakage
flux from the coils, and a control circuit (10) for controlling the cancellation flux
generated by the wires in the manner that the leakage flux from a face-plate of the
CRT is reduced by regulation of current value supplied to the wires. |