Shadow mask of color CRT

Details Shadow mask of color CRT Shadow mask of color CRT

2006-03-28

2006-03-28

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S408000

Reexamination Certificate

active

07019451

ABSTRACT:
The color cathode-ray tube includes a panel having a fluorescent screen formed on the inner surface thereof, a funnel coupled to the panel, an electron gun mounted into the neck portion of the funnel for emitting electron beams toward the fluorescent screen, and a shadow mask mounted on the fluorescent screen formed on the inner surface of the panel and having a predetermined distance from the fluorescent screen for carrying out color selection. The shadow mask is in a rectangular shape having a longer axis and a shorter axis and including a plurality of beam through apertures. The vertical pitch of the beam through apertures is between 0.15 mm and 0.35 mm. The vertical pitch of the beam through apertures increases as it goes from the central portion to the end portion of the shorter axis of the shadow mask.

REFERENCES:
patent: 5689149 (1997-11-01), Welles et al.
patent: 6157119 (2000-12-01), Hung et al.
patent: 6285122 (2001-09-01), Hosotani
patent: 6342759 (2002-01-01), Hosotani
patent: 6486596 (2002-11-01), Inoue et al.
patent: 6570310 (2003-05-01), Aibara
patent: 6642642 (2003-11-01), Watanabe et al.

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