Shadow mask with skirt

Details Shadow mask with skirt Shadow mask with skirt

1998-03-30

2000-04-18

Day, Michael H.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907

Patent

active

060519185

ABSTRACT:
A body of a shadow mask having a skirt portion around the body, wherein cut parts are formed in the skirt portion in the vicinity of corner portions and center portions of the short sides and the length of the skirt portion in the corner portions is longer than the length of the skirt portion in the center portions of the short sides. This enables residual distortion generated during welding with a mask frame and a thermal expansion generated later to be absorbed at the skirt portion, thus restraining the deformation generated by heating a curved surface of the shadow mask. As a result, it is possible to realize cost reduction and to improve productivity in manufacturing a color picture tube without deteriorating the color purity in the color picture tube by preventing the thermal deformation of the curved surface of a shadow mask during manufacturing processes of the color picture tube without a dummy baking process.

REFERENCES:
patent: 4678963 (1987-07-01), Fonda
patent: 5359259 (1994-10-01), Reidinger et al.

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