Magnetic shunt for deflection yokes

H - Electricity – 01 – J

Patent

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313/35.11

H01J 29/76 (2006.01) H01J 29/00 (2006.01)

Patent

CA 2011508

MAGNETIC SHUNT FOR DEFLECTION YOKES ABSTRACT OF THE DISCLOSURE Apparatus for reducing net distributed magnetic radia- tion in front of and all about the outside of a cathode ray tube display device. In such cathode ray apparatus a de- flection coil is provided having axially aligned and circum- ferentially aligned wire segments, relative to the central axis thereof, producing a distributed magnetic field in front of the screen as well as all about the outside of the device which is undesirable. The invention provides a magnetic shunt disposed between the deflection coil and the screen, the shunt comprising a substantially ring-shaped arrangement of magnetically permeable material and a pair of coupling wire loops about said ring electrically coupled in series with the deflection coil to induce a magnetic field in the ring to maximize cancellation of the net distributed magnetic field at a selected point in space in front of said screen as well as all about the display device, so as to provide optimized overall magnetic field reduction through the action of the shunt.

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