Color picture tube having improved slit type shadow mask and met

Details Color picture tube having improved slit type shadow mask and met Color picture tube having improved slit type shadow mask and met

1982-06-22

1984-01-31

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Radiation mask

430 23, 430321, 430323, 430396, 313403, 313408, 354 1, 445 47, G03C 500

Patent

active

044290284

ABSTRACT:
The photographic method utilized for fabricating slit-type shadow masks is improved by utilizing specially-shaped elements in a pattern on one of the photographic masters. In particular, the photographic master includes trapezoidal-shaped elements at locations away from the vicinity of the pattern minor axis, with the larger bases of the trapezoids facing away from the pattern minor axis.

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patent: 4370591 (1983-01-01), Satoh

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