Method of forming identifying indicium on cathode ray tubes
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKeishi Yokoyama, Mitsuru Matsushita, Tetsuya Ohtsuka, Yuji Okazaki
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Abstract
A method for forming an identifying indicia on a cathode ray tube being manufactured, which method is practiced by applying a paint containing a powdered metal to a particular exterior surface portion of a glass envelope, forming a part of the cathode ray tube, to form a solid paint layer, followed by the radiation of a laser beam onto at least a portion of the solid paint layer to form the identifying indicia represented by at least one trace of plasticized deformation on a surface region of the solid paint layer.
Claims8
A method for forming an identifying indicia on a cathode ray tube comprising an envelope, which method comprises the steps of:
- applying a paint containing a powdered metal, mixed in a matrix and a solvent, to a selected exterior surface portion of the envelope, said paint being of a nature capable of withstanding both heat treatment and chemical treatment generally practiced in the manufacture of the cathode ray tube;
- drying the applied paint to form a solid paint layer;
- and
- radiating a laser beam, with the use of a laser beam radiator, onto a portion of the solid paint layer to form the identifying indicia represented by at least one trace of plasticized deformation on a surface region of the solid paint layer.
Dependencies are inferred from the claim text.