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. 08, 1994
Filed:
Dec. 20, 1991
Applicant:
Inventors:
Hideki Yamamoto, Tokyo, JP;
Takayuki Yoshioka, Tokyo, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
348780 ; 348745 ;
Abstract
A three tube type projection television display device comprising red, green and blue projection tubes, wherein optical axes of projection lenses for the inclined projection tubes are off centered, instead of preparing a number of optical couplers of different sizes, from that of the inclined projection tubes by an eccentricity of .delta. when a projection picture size is varied for correcting a trapezoidal distortion in the same way as in the Scheimpflug rule, providing good registration on the screen and also bringing the projected pictures into focus on the entire screen.