Method for reducing pattern stripes in slotted mask screens for

Details Method for reducing pattern stripes in slotted mask screens for Method for reducing pattern stripes in slotted mask screens for

1978-07-31

1981-01-13

Hoffman, James R.

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

Using specific control or specific modification of exposure,...

427 431, 427 68, H01J 2932

Patent

active

042450195

ABSTRACT:
A method for forming patterned screens for cathode ray tubes wherein a multiplicity of viewing areas are spaced in accordance with and dimensionally smaller than openings of a mask member comprising the steps of coating the inner surface of a viewing panel with polyvinyl alcohol photosensitized with dichromate; exposing the viewing panel at a first positional location to radiant energy beamed through the mask openings; moving the viewing panel to a second positional location and exposing the viewing panel to radiant energy beamed through the mask openings; developing to remove the unexposed coating from the viewing panel; treating the exposed viewing panel with a dilute organic etching composition to erode the coating exposed to the radiant energy at one of the first and second positional locations; and washing the viewing panel to remove the etching composition and eroded coating leaving polymerized coating of a dimension smaller than the openings of the mask member.

REFERENCES:
patent: 3779760 (1973-12-01), Miyaoka
patent: 3856525 (1974-12-01), Inoue
patent: 3993487 (1976-11-01), Hosokoshi
patent: 4053906 (1977-10-01), Schultz
patent: 4059834 (1977-11-01), Hosokoshi
patent: 4086090 (1978-04-01), Kohashi

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