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. 07, 1992
Filed:
Jan. 18, 1990
Takahiko Yoshida, Ebina, JP;
Hiroki Yoshikawa, Hiratsuka, JP;
Shigeru Mori, Chigasaki, JP;
Koji Hirata, Kamakura, JP;
Tooru Numata, Yokohama, JP;
Isao Yoshizaki, Yokohama, JP;
Mitsuo Okimoto, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A projection type image display device provided with three projecting lenses projecting light emitted by cathode-ray tubes of different colors, red, green and blue, on a screen while enlarging an image is disclosed, in which clapper plates are disposed preferably in front of the red and the blue image source and the clapper plates have different shapes so as to obtain an image without the fluctuation in the color on the whole surface of the screen, even in the case where the distance from the cathode-ray tubes to the screen is shortened in order to reduce the size of the display device.