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. 11, 2008
Filed:
Feb. 12, 2007
Koji Hirata, Yokohama, JP;
Shuji Kato, Yokohama, JP;
Hidehiro Ikeda, Yokohama, JP;
Masahiro Yamamoto, Yokohama, JP;
Koji Hirata, Yokohama, JP;
Shuji Kato, Yokohama, JP;
Hidehiro Ikeda, Yokohama, JP;
Masahiro Yamamoto, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention relates to a rear projection type image display device comprising projection lenses () for projecting an image displayed on an image display element onto a transmission type screen () on a larger scale, an optical path turn-back mirror () for turning back halfway a light beam projected from the projection lenses, and a drive circuit for displaying an image on the image display element, that are fixedly housed within a housing (). When a diagonal size of the transmission type screen (), the depth of the housing (), and the length from a lower end of the screen () to a lower end of the housing (), are assumed to be SS (inch), D (inch), and L (inch), respectively, the following conditions are satisfied:>40,/3.0,/10.9.