Structure of shadow mask for flat cathode ray tube

Details Structure of shadow mask for flat cathode ray tube Structure of shadow mask for flat cathode ray tube

1998-07-21

2000-10-31

Day, Michael H.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, 313403, H01J 2907, H01J 2981

Patent

active

061407542

ABSTRACT:
A shadow mask for a flat CRT includes: an effective face in a central region having apertures through which electron beams emitted from an electron gun pass; a rail fixed to the mask, extending around the effective face; and ineffective faces outside the rail where mask holes are formed; wherein at least some of the mask holes formed in the ineffective faces of the mask are shaped as substantially circular dots, and decrease in diameter from the central region toward the outside of edges of the mask.

REFERENCES:
patent: 3894321 (1975-07-01), Moore
patent: 4652791 (1987-03-01), Palac et al.
patent: 4767962 (1988-08-01), Adler et al.

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