Ferrite core, deflection yoke, and color picture tube apparatus

Details Ferrite core, deflection yoke, and color picture tube apparatus Ferrite core, deflection yoke, and color picture tube apparatus

2007-01-02

2007-01-02

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

C313S440000

Reexamination Certificate

active

11098319

ABSTRACT:
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.

REFERENCES:
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patent: 6949875 (2005-09-01), Hwang et al.
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patent: 2004-14349 (2004-01-01), None
patent: WO 99/26270 (1999-05-01), None

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