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:
Jul. 10, 2007
Filed:
Mar. 26, 2004
Koji Hirata, Yokohama, JP;
Tsutomu Nakashima, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Nobuo Masuoka, Chigasaki, JP;
Koji Hirata, Yokohama, JP;
Tsutomu Nakashima, Yokohama, JP;
Masahiko Yatsu, Fujisawa, JP;
Nobuo Masuoka, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical unit includes a light source, a color separator, reflection-type image display elements, a color synthesizer, a reflection-type polarization plate, and an optical chassis. The optical chassis holds the reflection-type polarization plate and the reflection-type image display elements thereon, and has a translucent window on an incident light side of the reflection-type polarization plate while an exiting light side of the reflection-type polarization plate is sealed with an incident surface of the color synthesizer. A hermetically sealed space is defined by the optical chassis, the reflection-type image display elements and the incident surface of the color synthesizer, and within the hermetically sealed space is disposed a translucent liquid having a refraction index from 1.2 to 1.9.