Color cathode-ray tube including a shadow mask having holes arra

Details Color cathode-ray tube including a shadow mask having holes arra Color cathode-ray tube including a shadow mask having holes arra

1997-03-07

1999-06-29

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, 313408, H01J 2907

Patent

active

059172738

ABSTRACT:
In a color cathode-ray tube having a glass envelope including a panel portion, neck portion and a funnel portion coupling the panel and neck portions to each other, an electron gun mounted within the neck portion for producing electron beams, a phosphor screen formed on an inner surface of a face plate of the panel portion and a shadow mask having a plurality of holes therein and disposed opposing the phosphor screen so that the electron beams pass through holes in the shadow mask to impinge on the phosphor screen, the holes in the shadow mask are arranged with a varying arrangement pitch which is monotonically non-decreasing from a central portion to two opposite peripheral portions of the shadow mask as viewed, in a horizontal direction in the color cathode-ray tube, at an arbitrary position on the shadow mask in a vertical direction in the color cathode-ray tube. The rate of increase of the varying arrangement pitch in the horizontal direction is substantially zero in first regions from the central portion to intervening portions between the central portion and the two opposite peripheral portions of the shadow mask, and has a gradient not smaller than zero in second regions from the intervening portions to the two opposite peripheral portions of the shadow mask.

REFERENCES:
patent: 4475056 (1984-10-01), Hirai
patent: 4583022 (1986-04-01), Masterton
patent: 4727282 (1988-02-01), Tokita et al.
patent: 4743795 (1988-05-01), Thoms
patent: 5155410 (1992-10-01), Wakasono et al.
patent: 5633558 (1997-05-01), Watanabe et al.
(for Japanese Kokai 1-77841 published on Mar. 23, 1989).

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