Method for manufacture of color television picture tubes using r

Details Method for manufacture of color television picture tubes using r Method for manufacture of color television picture tubes using r

1975-02-18

1976-11-23

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

354 1, 427 68, G03C 500

Patent

active

039934870

ABSTRACT:
The invention discloses a method and apparatus for manufacture of color television picture tubes of the type having a shadow mask with a multiplicity of slots, and more particularly for selectively exposing a light sensitive film uniformly coated over the inner surface of a face-panel in order to form the temporary dots or strips. The exposure light source is rotated in the form of a ring while it is displaced relative to the light sensitive film in the longitudinal direction of the slots in a shadow mask, whereby the spacing in the longitudinal direction between the adjacent exposed areas or light images projected may be advantageously reduced without reducing the spacing in the longitudinal direction between the adjacent slots in the shadow mask; that is, the width of the bridge therebetween, so that the color television picture tubes with excellent brightness and contrast characteristics may be provided without adversely affecting the mechanical strength of the shadow mask.

REFERENCES:
patent: 3559546 (1971-02-01), McKee
patent: 3667947 (1972-06-01), McKee
patent: 3725106 (1973-04-01), Hosokosni
patent: 3736848 (1973-06-01), Tsuneta et al.
patent: 3764366 (1973-10-01), Ninagawa et al.
patent: 3779760 (1973-12-01), Miyaoka
patent: 3856525 (1974-12-01), Inoue
patent: 3876425 (1975-04-01), Geenen
patent: 3890151 (1975-06-01), Suzuki et al.
patent: 3936302 (1976-02-01), Takami et al.

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