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:
Feb. 23, 2010
Filed:
Jun. 19, 2006
Hidehiro Ikeda, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Koji Hirata, Yokohama, JP;
Kei Adachi, Yokohama, JP;
Hidehiro Ikeda, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Koji Hirata, Yokohama, JP;
Kei Adachi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A projection type video display apparatus having improved color separating ability is provided. The projection type video display apparatus includes a color separating unit including an entrance plate provided with an aperture through which light beams emitted by a light source travel, an optical integrator, and a plurality of dichroic mirrors disposed with their color separating surfaces extended substantially parallel to the exit surface of the optical integrator and capable of transmitting color light beams of wavelengths in a predetermined wavelength range and of reflecting color light beams of wavelengths outside the predetermined wavelength range.