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:
Apr. 06, 1976
Filed:
Dec. 12, 1973
Applicant:
Inventors:
Kuniyoshi Koyama, Chofu, JA;
Yoji Ishikawa, Tokyo, JA;
Assignee:
Sony Corporation, Tokyo, JA;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
178 / ; 315370 ;
Abstract
An image projection system having an image projector and a concave viewing screen, in which the image projector comprises a cathode raytube, a horizontal and a vertical deflecting coil for beam scanning in the cathode ray tube, and a projection lens, and the amplitude of scanning currents supplied to the horizontal and the vertical deflecting coil is controlled in vertical and horizontal scanning periods respectively, so that trapezoid-shaped and fan-shaped distortions in the projected image on the viewing screen are compensated for.