Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

2006-02-14

2006-02-14

Bruce, David V. (Department: 2882)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S403000, C313S407000, C313S408000

Reexamination Certificate

active

06998765

ABSTRACT:
Disclosed is a color cathode ray tube which can effectively improve impact resistance by setting a ratio of a curvature coefficient (a/b) of the shadow mask for a long axis to be in a range of about 100,000–135,000, and by setting a ratio of a curvature coefficient (c/d) of the shadow mask for a short axis to be in a range of about 60,000–360,000. Also, in defining ratios between a curvature radius of a center portion of the shadow mask and curvature radiuses along a horizontal direction, a vertical direction, and a diagonal direction, the curvature radius decreases towards the peripheral portions of the shadow mask, thereby improving impact resistance and drop characteristics and thus effectively preventing color purity from being degraded.

REFERENCES:
patent: 4623818 (1986-11-01), Yamazaki
patent: 5155410 (1992-10-01), Wakasono et al.
patent: 6448706 (2002-09-01), Kawamura et al.
patent: 6593685 (2003-07-01), Kim
patent: 6628060 (2003-09-01), Shimizu et al.
patent: 6674225 (2004-01-01), Jung
patent: 6879094 (2005-04-01), Choi
patent: 2001/0018309 (2001-08-01), Nishiki et al.
patent: 2002/0195920 (2002-12-01), Furusawa et al.

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