Shadow mask frame for prevention of halation

Details Shadow mask frame for prevention of halation Shadow mask frame for prevention of halation

1989-10-25

1994-03-29

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, H01J 2981

Patent

active

052988325

ABSTRACT:
A shadow mask frame for prevention of halation in a color picture tube is characterized in that a bent end portion bent toward the frontal face of the panel is provided around the periphery of an open portion of the frame in a predetermined inclination angle relative to the plane of the frame, the bending being formed toward the panel of the picture tube. The ineffectively overscanned electron beams are positively reflected away toward the opposite side of the luminescent screen, with the result that not only the halation prevention effect becomes superior, but also that there is no difficulty in manufacturing and assembling.

REFERENCES:
patent: 3519869 (1970-07-01), Kuniyoshi
patent: 3588568 (1971-06-01), Sohn
patent: 4659959 (1987-04-01), Fonda
patent: 4931690 (1990-06-01), Kokubu et al.

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