US 6,686,709 B2 · Deflection yoke for a CRT

Abstract

A deflection yoke is provided for a CRT, which includes horizontal and vertical deflection coils that deflect electron beams emitted from an electron gun in a horizontal or vertical direction, a ferrite core that reduces a loss of magnetic force caused by the horizontal and vertical deflection coils thereby enhancing magnetic efficiency, and a holder that holds the horizontal deflection coils, the vertical deflection coils, and the ferrite core at required positions, and provides insulation between the horizontal deflection coils and the vertical deflection coils. The horizontal and/or vertical deflection coils have a substantially rectangular shape on a screen side, and the ferrite core is circular or elliptical. This reduces material costs and reduces convergence and distortion errors, because a dimensional distribution of an inside surface area of the ferrite core is reduced with respect to related art deflection yokes, and polishing of an inside surface becomes easier. This significantly improves production yield and the dimensional distribution of the ferrite core.

Claims24

Dependent claims

A cathode ray tube (CRT), comprising:

a panel having a fluorescent surface comprising red R, green G, and blue B fluorescent materials;
a funnel fitted to a rear of the panel for maintaining an inner space in vacuum;
an electron gun fitted inside of a tubular neck part at a rear of the funnel for emitting electron beams;
and
a deflection yoke for deflecting the electron beams in a horizontal and/or vertical direction, the deflection yoke including:
horizontal and vertical deflection coils for deflecting the electron beams emitted from the electron gun in a horizontal and/or vertical direction;
a ferrite core for reducing a loss of magnetic force caused by the horizontal and vertical deflection coils to enhance a magnetic efficiency;
and
a holder for holding the horizontal deflection coil, the vertical deflection coil, and the ferrite core at required positions, and providing insulation between the horizontal and vertical deflection coils, wherein a screen side of the horizontal and/or vertical deflection coil has a substantially rectangular shape, and the ferrite core is circular or elliptical.

6 more elements

Dependencies are inferred from the claim text.

Deflection yoke for a CRT

Life of this patent

Deflection yoke for a CRT

Life of this patent

Abstract

Claims24