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US 5,363,011 AGranted
Strip-type shadow mask effective to alleviate degrouping
AssigneeZenith Electronics Corporation
InventorJames R. Fendley
Life of this patent
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Abstract
A striped-screen tension mask color CRT has a flat glass face with stripes of trios of colored-light-emitting phosphors deposited on its inner surface. An associated strip-type shadow mask has a predetermined downward curvature from center to sides effective to alleviate degrouping of electron beams when the tube is activated.
Claims4
A Striped-screen tension mask color CRT having a funnel and further comprising:
- a) a flat glass faceplate having a flat inner, screen-receiving surface affixed to the funnel;
- b) a substantially rectangular screen having an x-axis and a y-axis, the x-axis and the y-axis crossing each other at the center of the screen, and stripes of trios of colored-light-emitting phosphors on the inner screen-receiving surface oriented in a first direction, parallel to the y-axis, and activated by electron beams;
- c) a tensed, strip-type foil shadow mask held in fixed relation to the inner screen-receiving surface, with stripes oriented in the first direction, and having a predetermined curvature such that the distance between the shadow mask and the inner screen-receiving surface decreases as the distance increases from the y-axis, the curvature being effective to alleviate degrouping of the electron beams.
A faceplate assembly for use in a striped-screen color CRT having a strip-type mask, comprising:
- a) a flat glass faceplate having a flat inner, screen-receiving surface;
- b) a substantially rectangular screen having an x-axis and a y-axis, the x-axis and the y-axis crossing each other at the center of the screen, and stripes of trios of colored-light-emitting phosphors on the inner screen-receiving surface oriented in a first direction, parallel to the y-axis, and activated by electron beams;
- c) a stripe-type foil shadow mask with strips oriented in the first direction;
- d) two shadow mask supports affixed to the inner surface on the opposed sides of the screen in a second direction normal to the first direction for receiving the mask tensed in the first direction, the supports each having a mask-receiving surface having a predetermined curvature such that the distance between the mask-receiving surface and the inner screen-receiving surface decreases as the distance from the y-axis increases, the curvature being effective to bow the shadow mask and alleviate degrouping of the electron beams.
1 more element
Dependencies are inferred from the claim text.