Color picture tube with reduced primary and secondary moire

Details Color picture tube with reduced primary and secondary moire Color picture tube with reduced primary and secondary moire

1994-11-21

1996-06-11

Snow, Walter E.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, H01J 2907

Patent

active

055258581

ABSTRACT:
An improved color picture tube, operable in a multistandard television receiver, includes a viewing screen, a shadow mask and an electron gun for generating and projecting three electron beams through the shadow mask and onto the screen. The screen includes phosphor lines that extend in a first direction. The electron beams are subject to deflection in the first direction and in a second direction, that is substantially perpendicular to both the first direction and the phosphor lines. The shadow mask includes elongated slit-shaped apertures that are aligned in columns that substantially parallel the phosphor lines. The adjacent apertures in each column are separated from each other by tie-bars in the mask, and the tie-bars in one column are offset from the tie-bars in adjacent columns in the first direction. The improvement includes the tie-bars in alternate columns lying on substantially straight lines that form an angle of approximately 2 degrees with respect to the second direction.

REFERENCES:
patent: 3633058 (1972-01-01), Kouno
patent: 3663854 (1972-05-01), Tsuneta et al.
patent: 3973159 (1976-08-01), Barten
patent: 4210842 (1980-07-01), Nakayama et al.
patent: 4583022 (1986-04-01), Masterton
patent: 4751425 (1988-06-01), Barten
patent: 4983879 (1991-01-01), Kawaguchi
patent: 5030881 (1991-07-01), Marks et al.
patent: 5378959 (1995-01-01), Mancini

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