Matsushita Toshiba Picture Display Co., Ltd.

Akitsugu Ishii

Etsuji Tagami

A deflection yoke includes ferrite core, horizontal deflection coil, vertical deflection coil, and insulating frame for insulating the horizontal and vertical deflection coils. The deflection yoke has a cross section that satisfies the following A to C. A: A plurality of magnetic substance convex portions projecting toward the tube axis are provided in the vicinity of a position of an inner surface of the ferrite core where a vertical axis crosses. B: Assuming that a minimum value among distances between the respective magnetic substance convex portions and a funnel is D, the distance between the ferrite core excluding the plurality of magnetic substance convex portions and the funnel is larger than the distance Dat any point of the ferrite core. C: A part of the vertical deflection coil is wound in a groove between the plurality of magnetic substance convex portions.

Color picture tube apparatus with particular deflection yoke structure

A ferrite core constituting a deflection yoke has a plurality of ridge-shaped convex portions on an inner circumferential surface. In a cross-section orthogonal to a center axis, the cross-sectional shape of an outer circumferential surface of the ferrite core is substantially circular, and the cross-sectional shape of an inner circumferential surface of the ferrite core excluding the convex portions is substantially circular in the vicinity of an end on a large diameter side of the ferrite core and is substantially rectangular in a portion between the vicinity of an end on a small diameter side and the vicinity of the end on the large diameter side. This can provide a low-cost color picture tube apparatus with a reduced deflection power and satisfactory productivity.

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Muko, Japan

Akitsugu Ishii