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. 14, 1976
Filed:
Sep. 13, 1974
Applicant:
Inventors:
Yujiro Tatsuno, Hitachi, JA;
Takatoshi Ikeda, Hitachi, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ; G03B / ; H01J / ;
U.S. Cl.
CPC ...
355 20 ; 178-785 ; 355 52 ;
Abstract
To prevent a picture of cathode-ray tube, which picture is projected through an optical lens system from being imaged with a deformed shape on a flat plane because of the curved phosphor screen of cathode-ray tube, an optical lens system is provided having imaging characteristics such that the central portion of an image formed thereby is convex toward the optical lens system.