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US 7,098,582 B2Granted
Cathode ray tube having an improved shadow mask
AssigneeLG. Philips Displays Korea Co., Ltd.
InventorYong Kun Kim
Life of this patent
Estimating the term…
Abstract
A cathode ray tube comprises a panel having a fluorescent formed on an inner surface thereof; a funnel connected to the panel; an electron gun housed in the funnel emitting electron beams; a deflection yoke for deflecting the electron beams in horizontal and vertical directions; a shadow mask for selecting colors of the electron beams; and a mask frame for supporting the shadow mask, in which an outer surface of the panel is substantially flat and an inner surface has a designated curvature, and a radius of curvature from a center of the shadow mask in a major-axis, minor-axis and diagonal-axis direction is substantially same.
Claims23
A cathode ray tube, comprising:
- a panel having a fluorescent formed on an inner surface thereof;
- a funnel connected to the panel;
- an electron gun housed in the funnel, emitting electron beams;
- a deflection yoke for deflecting the electron beams in horizontal and vertical directions;
- a shadow mask for selecting colors of the electron beams;
- and
- a mask frame for supporting the shadow mask,
- wherein an outer surface of the panel is substantially flat and an inner surface has a designated curvature,
- wherein a radius of curvature from a center of the shadow mask in a major-axis, minor-axis and diagonal-axis direction is substantially the same, and
- wherein the shadow mask satisfies a curvature radius expansion expressed by Z(x, y)=ax2+bx4+cy2+dy4+ex2y2+fx4y2+gx2y4+hx4y4, b/a satisfies a condition of 2.2×10−6<b/a<4.4×10−6, x and y being a distance (mm) from the center of the shadow mask to a point respectively, and Z being a height difference (mm) between the center of the shadow mask and the point on the shadow mask.
7 more elements
A cathode ray tube comprising:
- a panel having a fluorescent formed on an inner surface thereof;
- a funnel connected to the panel;
- an electron gun housed in the funnel, emitting electron beams;
- a deflection yoke for deflecting the electron beams in horizontal and vertical directions;
- a shadow mask for selecting colors of the electron beams;
- and
- a mask frame for supporting the shadow mask,
- wherein an outer surface of the panel is substantially flat and an inner surface has a designated curvature,
- wherein a radius of curvature from a center of the shadow mask in a major-axis direction is Rxo, a radius of curvature in a minor-axis direction Ryo, and a radius of curvature in a diagonal-axis direction Rdo, the Rxo, Ryo and Rdo are not less than 85% of a maximum value among the Rxo, Ryo and Rdo, and
- wherein the radius of curvature in the major-axis direction from the shadow mask center is Rxo, the radius of curvature in the minor-axis direction Ryo, the radius of curvature in the diagonal-axis direction Rdo, a radius of curvature at an end of an effective surface in the major-axis direction of the shadow mask Rxf, a radius of curvature at an end of the effective surface in the minor-axis direction Ryf, and a radius of curvature at an end of the effective surface in the diagonal-axis direction Rdf, at least one of Rxf/Rxo, Ryf/Ryo and Rdf/Rdo satisfies conditions of 44.7%<Rxf/Rxo<77.6%, 59.0%<Ryf/Ryo<86.1% and 34.6%<Rdf/Rdo<69.2%.
7 more elements
A cathode ray tube comprising:
- a panel having a fluorescent formed on an inner surface thereof;
- a funnel connected to the panel;
- an electron gun housed in the funnel, emitting electron beams;
- a deflection yoke for deflecting the electron beams in horizontal and vertical directions;
- a shadow mask for selecting colors of the electron beams;
- and
- a mask frame for supporting the shadow mask
- wherein an outer surface of the panel is substantially flat and an inner surface has a designated curvature, and a minor-axis direction length of the shadow mask is H, a radius of curvature from a center of the shadow mask in a major-axis direction is Rxo, a radius of curvature in a minor-axis direction Ryo, and a radius of curvature in a diagonal-axis direction Rdo, the Rxo, Ryo and Rdo within the length H/12 from the center of the shadow mask satisfy a condition of
- Max
-
- (
- Rxo
- ,
- Ryo
- ,
- Rdo
- )
- -
- Min
-
- (
- Rxo
- ,
- Ryo
- ,
- Rdo
- )
- Max
-
- (
- Rxo
- ,
- Ryo
- ,
- Rdo
- )
- ≤
- 0.15
- .
36 more elements
Dependencies are inferred from the claim text.