Cathode-ray tube apparatus
AssigneeMatsushita Toshiba Picture Display Co., Ltd.
InventorKatsuyo Iwasaki
Life of this patent
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Abstract
BVM coils for modulating a scanning velocity in a horizontal direction of electron beams emitted from an electron gun are provided at a position where the BVM coils are overlapped with an electron gun in a tube axis direction, and a pair of magnetic substance pieces are provided at a position where the pair of magnetic substance pieces are overlapped with the BVM coils in the tube axis direction. The pair of magnetic substance pieces surround a funnel continuously in a circumferential direction of an outer circumferential surface of the funnel, except for a portion of the surface that intersects a plane defined by the tube axis and a vertical direction axis, and the vicinity of that portion. Because of this, a cathode-ray tube apparatus with the sensitivity of the BVM coils enhanced can be provided.
Claims2
A cathode-ray tube apparatus, comprising:
- a panel having a phosphor screen formed on an inner surface thereof,
- a funnel connected to the panel;
- an electron gun housed in a neck portion of the funnel;
- a deflection yoke for deflecting electron beams emitted from the electron gun in a horizontal direction and a vertical direction, provided on an outer circumferential surface of the funnel;
- BVM coils for modulating a scanning velocity in the horizontal direction of the electron beams emitted from the electron gun, provided at a position where the BVM coils are overlapped with the electron gun in a tube axis direction;
- and
- a pair of magnetic substance pieces provided at a position where the pair of magnetic substance pieces are overlapped with the BVM coils in the tube axis direction,
- wherein the pair of magnetic substance pieces surround the funnel continuously in a circumferential direction of the outer circumferential surface of the funnel, except for a portion of the surface that intersects a plane defined by the tube axis and a vertical direction axis, and the vicinity of that portion.
Dependencies are inferred from the claim text.