Color CRT with shadow mask having peripherally grooved skirt

Details Color CRT with shadow mask having peripherally grooved skirt Color CRT with shadow mask having peripherally grooved skirt

1978-10-23

1980-03-04

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907

Patent

active

041919092

ABSTRACT:
This disclosure depicts a CRT (color cathode ray tube) of the shadow mask type, and an improved shadow mask therefor. The CRT has a screen and an electron gun assembly for generating a plurality of electron beams. The improved shadow mask has a dished perforate central portion for selectively transmitting electrons to the screen. The mask has a predetermined surface on a peripheral portion of the mask which is so oriented that when the mask is in place in an operating tube there results an undesirable specular electron reflection of overscanned electrons off the exposed surface and a visible electron flooding of the screen near its perimeter. The shadow mask is characterized by having on the said surface an array of close-spaced grooves oriented to scatter a major fraction of reflected overscanned electrons away from the screen and to thereby markedly suppress the said visible electron flooding of said screen.

REFERENCES:
patent: 3345530 (1967-10-01), Haas
patent: 3809945 (1974-05-01), Roeder
patent: 3862448 (1975-01-01), Ishizuka et al.
patent: 3912963 (1975-10-01), Sedivy

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