Color cathode-ray tube

Details Color cathode-ray tube Color cathode-ray tube

1994-09-29

1996-04-09

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313404, 313407, H01J 2907

Patent

active

055064663

ABSTRACT:
A shadow mask of a color cathode ray tube includes a mask body having a rectangular effective area with a large number of electron beam apertures, a non-effective area surrounding the effective area, and a skirt portion extending from a peripheral portion of the non-effective area. The mask body has a belt-shaped reinforcing bead extending between two end edges of the mask body, which are in parallel to the vertical axis, through a central portion of the mask body and projecting from the effective area toward a phosphor screen. The reinforcing bead is formed such that a projecting height thereof is gradually decreased from the central portion of the mask body toward the two end edges of the mask body and such that the projecting height thereof at boundaries between the effective and non-effective areas becomes about not more than 2/3 the height of the reinforcing bead at the central portion of the mask body.

REFERENCES:
patent: 3944867 (1976-03-01), Kaplan
patent: 4122368 (1978-10-01), Masterton
patent: 4504764 (1985-03-01), Sakamoto et al.
patent: 4780641 (1988-10-01), Hashiba et al.
patent: 5391957 (1995-02-01), Fendley
patent: 5394051 (1995-02-01), Lerner

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