Mask frame assembly for applying optimal tension in a CRT

Details Mask frame assembly for applying optimal tension in a CRT Mask frame assembly for applying optimal tension in a CRT

2005-02-08

2005-02-08

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000

Reexamination Certificate

active

06853121

ABSTRACT:
A mask frame assembly in a cathode ray tube is capable of minimizing a howling phenomenon and preventing local wrinkles of a shadow mask by optimizing positioning of compression of the mask frame assembly. A mask frame assembly for applying optimal tension in a cathode ray tube includes a shadow mask for selecting color and a frame assembly having a main frame for applying tension to the shadow mask and a sub-frame for supporting the main frame, wherein each of compression points of the main frame is set to satisfy the following expressions, (L/2)×0.38≦X1≦(L/2)×0.52, and (L/2)×0.80≦X2×(L/2)×0.98, where L is a length of a long side of the main frame, X1 and X2 are distances from the center of the main frame to each of compression points P1and P2in both sides.

REFERENCES:
patent: 5801479 (1998-09-01), Shinoda
patent: 6084342 (2000-07-01), Ragland, Jr.
patent: 6106353 (2000-08-01), Kimura et al.
patent: 6280276 (2001-08-01), Bucher et al.

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