Shadow mask with slots having a front side opening with an...

Details Shadow mask with slots having a front side opening with an... Shadow mask with slots having a front side opening with an...

2007-01-30

2007-01-30

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000

Reexamination Certificate

active

11246532

ABSTRACT:
In a shadow mask21, a large number of slots23are made in a mask body22in the horizontal direction X and in the vertical direction Y. Each slot23has a roughly rectangular backside opening33, a roughly rectangular front-side opening32, and a through-hole31that connects these two openings33, 32. Of the multiple slots23made in the mask body22, the slots23situated at least in those areas of the mask body22that are surrounded by a horizontal axis24and two diagonal axes26, 27that pass through the center point28of the mask body22have such front-side openings32that a pair of the upper and lower short sides32c,32dof the rectangular outline of the front-side opening32of each slot23are inclined, relative to the horizontal axis24, along the radiate line61radiating from the center point28of the mask body22toward the slot23. The angle of inclination β of the short sides32c,32dis preferably in the range of a α±10°, where α is the angle between the radiate line61radiating from the center point28of the mask body toward the slot23and the horizontal axis24.

REFERENCES:
patent: 4168450 (1979-09-01), Yamauchi et al.
patent: 4429028 (1984-01-01), Kuzminski
patent: U 61-177353 (1986-11-01), None
patent: A 01-320738 (1989-12-01), None
patent: A 05-006741 (1993-01-01), None
patent: A 2001-068019 (2001-03-01), None
U.S. Appl. No. 11/246,529, filed Oct. 11, 2005, Hideshima et al.
U.S. Appl. No. 11/248,193, filed Oct. 13, 2005, Hideshima et al.

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