Method of manufacturing correction filter for exposing screens of color-picture tubes
AssigneeInternational Standard Electric Corporation
InventorsNadezda Blahna, Bruno Fischer
Life of this patent
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Abstract
To obtain the desired light-intensity distribution in lighthouses for exposing color-picture-tube screens, use is made of light filters. The filter disclosed is obtained by spraying droplets of an opaque paint onto a suitable transparent support.
Claims13
A method of manufacturing a correction filter of the type that has a light-absorbing transmission pattern for generating, during the photochemical manufacture of the screen of a color-picture tube, a predetermined exposure intensity distribution over an area, said transmission pattern being formed by the step of:
- applying to a transparent support a distribution of predominantly opaque spots formed by solidified droplets having a concentration profile chosen in accordance with the predetermined intensity distribution and achieved by using stencils.
A method of manufacturing a correction filter of the type that has a light-absorbing transmission pattern for generating, during the photochemical manufacture of the screen of a color-picture tube, a predetermined exposure intensity distribution over an area, said transmission pattern being formed by the step of:
- applying to a transparent support a distribution of predominantly opaque spots formed by solidified droplets having a concentration profile chosen in accordance with the predetermined intensity distribution and achieved by performing several spraying operations.
Dependencies are inferred from the claim text.