Color picture tube and method for manufacturing the same

Details Color picture tube and method for manufacturing the same Color picture tube and method for manufacturing the same

2007-06-05

2007-06-05

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C445S047000

Reexamination Certificate

active

11295265

ABSTRACT:
A phosphor screen is formed on an inner surface of a face portion whose outer surface is substantially flat. A shadow mask faces the phosphor screen. The shadow mask includes a perforated portion having a plurality of apertures, a non-perforated portion formed on a periphery of the perforated portion and a skirt portion formed on a periphery of the non-perforated portion. The non-perforated portion includes a pair of longer side portions each having an outer bead and an inner bead that are adjacent to each other and a pair of shorter side portions each having the outer bead and an inner bead that are adjacent to each other. In each of the pair of longer side portions, the spacing between the outer bead and the inner bead is at least 2 mm. This makes it possible to suppress wavy wrinkles generated in the perforated portion, so that the image quality of a color picture tube can be improved.

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