Optical scanning apparatus and method for manufacturing cathode

Details Optical scanning apparatus and method for manufacturing cathode Optical scanning apparatus and method for manufacturing cathode

1976-06-23

1977-05-31

Gonzales, John

96 361, G03B 4100

Patent

active

040273121

ABSTRACT:
An optical scanning apparatus for manufacturing cathode ray tubes having a faceplate with an inner surface layer of photosensitive material and an adjacent apertured mask wherein a light beam from a light source is applied to a deflection device controlled by a control circuit to effect deflection of the light beam at an angle related to the angle of incidence of an electron beam in a cathode ray tube. The deflected light beam is imaged onto the inner surface of the faceplate of the cathode ray tube through the apertured mask, and a device is provided for scanning the deflected light beam over the surface of the faceplate in a predetermined pattern to effect exposure of the photosensitive material in the proper locations for registration with the landing location of an electron beam in the cathode ray tube. The size and shape of the effective area occupied by the light beam at the scanning device is controlled to effect proper selection of the size and shape of the exposed photosensitive material in relation to the associated aperture in the mask. Depending upon the desired shape and size of the exposed photosensitive material on the faceplate, the light beam area at the scanning device may be made to simulate a point, line or area source.

REFERENCES:
patent: 3876425 (1975-04-01), Geenen et al.

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