Method for making a color selection mask for a color cathode ray

Details Method for making a color selection mask for a color cathode ray Method for making a color selection mask for a color cathode ray

1974-11-04

1976-05-11

Powell, William A.

Gas separation: apparatus

Electric field separation apparatus

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

156 3, 156 6, 156 11, 156 18, G03C 500

Patent

active

039559807

ABSTRACT:
This disclosure depicts a method of forming a pattern of electron-transmissive apertures in a color selection mask for use in a color television cathode ray tube. The method comprises: providing an electrically conductive blank with a substrate layer and an aperture-defining layer; applying a coating of photoresist material on the aperture-defining layer; exposing the photoresist coating in a first preselected illumination pattern with a preselected degree of exposure and in a second preselected illumination pattern with a preselected degree of exposure substantially different from the preselected degree of exposure of the first preselected illumination pattern; developing the exposed photoresist coating corresponding to the first preselected illumination pattern; etching through the blank; developing the exposed areas of the photoresist coating corresponding to the second preselected illumination pattern thereby baring a portion of the aperture-defining layer; and etching the newly bared portion of the aperture-defining layer. Apparatus for use with the above-described method is disclosed.

REFERENCES:
patent: 3423261 (1969-01-01), Frantzen
patent: 3661581 (1972-05-01), Feldstein
patent: 3725065 (1973-04-01), Fadner
patent: 3730719 (1973-05-01), Law
patent: 3788846 (1974-01-01), Mayuad et al.

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