Method for forming a phosphor screen of a cathode ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsSeiji Sagou, Takeo Itou
Life of this patent
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Abstract
In a method for a phosphor screen of a cathode ray tube including the steps of forming a photo-tacky layer on a panel of a cathode ray tube, exposing the photo-tacky layer to form an adhesive pattern on the layer, and adhering phosphor powder on the adhesive pattern, in which these exposing and adhering steps are repeated. Before next exposing step, the photo-tacky layer is heated and then exposed after cooled. The heating step prevents the sensitivity of the layer from deterioration occurred by the preceding adhering step.
Claims11
In a method for forming a phosphor screen of a cathode ray tube comprising the steps of:
- coating a photo-tacky layer on a panel of the cathode ray tube;
- exposing a surface of the photo-tacky layer to light to form a pattern of adhesive surfaces on the layer;
- and
- adhering phosphor powder to the pattern and in which the exposing and adhering steps are repeated, two times or more, wherein
- at least a heating before exposure step for heating the photo-tacky layer to a temperature in the range of 40.degree.-110.degree. C. is contained in the steps after the adhering steps for a first phosphor.
A method for forming a phosphor screen of a cathode ray tube comprising the steps of:
- coating a photo-tacky layer on a panel of the cathode ray tube;
- heating before exposure for heating the phototacky layer to a temperature in the range of 40.degree.-110.degree. C.;
- exposing the photo-tacky layer to light to form a pattern of adhesive surfaces on the layer;
- contacting and adhering phosphor powder onto the layer;
- and
- removing excess phosphor powder from the panel, wherein the steps except for the coating step are repeated for each phosphor, and in the heating before exposure step the photo-tacky layer is heated higher than a temperature at which the phototacky layer is exposed.
A method for forming a phosphor screen of a cathode ray tube comprising the steps of:
- coating a photo-tacky layer on a panel of a cathode ray tube;
- exposing selectively the photo-tacky layer to light to cause a predetermined pattern of adhesive surfaces on the layer;
- and
- adhering phosphor powder on the adhesive surfaces, the improvement comprising:
- (a) a coating step for coating the photo-tacky layer on the panel;
- (b) a first exposing step for exposing selectively the photo-tacky layer to light to form the pattern of adhesive surfaces on the layer;
- (c) a first adhering step for contacting a first phosphor powder on the adhesive surfaces to adhere thereon;
- (d) a heating step for heating the photo-tacky layer to a temperature in the range of 40.degree.-110.degree. C.;
- (e) a second exposing step for exposing selectively the photo-tacky layer to light to form a predetermined pattern of adhesive surfaces;
- and
- (f) a second adhering step for contacting a second phosphor powder to adhere on the adhesive surfaces.
Dependencies are inferred from the claim text.