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:
Sep. 21, 1976
Filed:
Aug. 22, 1974
Applicant:
Inventors:
Eiichi Yamazaki, Ichihara, JA;
Koichi Maruyama, Mobara, JA;
Toshio Ueda, Mobara, JA;
Hiroshi Yokomizo, Mobara, JA;
Iwao Ogura, Tokyo, JA;
Assignee:
Hitachi, Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354-1 ;
Abstract
In light exposure apparatus wherein the face plate of a color picture tube is exposed to the light from a light source through a swinging illumination intensity correcting filter, a correction lens and a color selection electrode, the effective surface of the illumination intensity correcting filter comprises a plurality of regions having different light transmitting ability, and the effect of the optical characteristics at the interfaces between the regions is arranged and substantially eliminated by the swinging motion of the illumination intensity correcting filter.