The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1987
Filed:
Aug. 08, 1985
Applicant:
Inventors:
Masahiro Nishizawa, Mobara, JP;
Kiyoshi Miura, Mobara, JP;
Osamu Sasaya, Mobara, JP;
Yoshiyuki Odaka, Isumi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D / ; B05D / ;
U.S. Cl.
CPC ...
427 531 ; 2191 / ; 2191 / ; 427 68 ; 427226 ; 427228 ; 427244 ; 427270 ; 427271 ; 427282 ; 430 24 ; 430 25 ; 430945 ;
Abstract
Disclosed herein is a method of producing a phosphor screen of color picture tube wherein a light absorbing material is applied onto the inner surface of a panel, a shadow mask is provided, the surface of film of the light absorbing material is scanned and irradiated with a laser beam via the shadow mask so that portions of the light absorbing material irradiated with the laser beam are heated and burned, thereby to form a black matrix. According to this method, the number of steps for forming the black matrix is decreased, and the quality and yield of the phosphor screen are increased.