Color cathode ray tube having smooth screen edges

Details Color cathode ray tube having smooth screen edges Color cathode ray tube having smooth screen edges

1985-04-29

1986-12-23

Levy, Stewart J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907, H01J 3120

Patent

active

046314407

ABSTRACT:
In a color cathode ray tube having a vertically striped screen and a vertically slotted aperture mask, the top and bottom screen edges are made smooth by varying the vertical pitch between mask apertures while keeping the number of apertures per vertical column constant, so that every other column terminates in a full length slot.

REFERENCES:
patent: 3766419 (1973-10-01), Barbin
patent: 3856525 (1974-12-01), Inoue
patent: 3973159 (1976-08-01), Barten
patent: 4300070 (1981-11-01), Godfrey et al.

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