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:
Jun. 28, 2005
Filed:
Jan. 15, 2003
Applicants:
Taro Imahase, Fujisawa, JP;
Satoshi Ouchi, Kamakura, JP;
Tetsu Ohishi, Hiratsuka, JP;
Tomohiro Miyoshi, Fujisawa, JP;
Inventors:
Taro Imahase, Fujisawa, JP;
Satoshi Ouchi, Kamakura, JP;
Tetsu Ohishi, Hiratsuka, JP;
Tomohiro Miyoshi, Fujisawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B021/14 ;
U.S. Cl.
CPC ...
Abstract
A projection-type display apparatus is improved in contrast by an overlap between a band of light to be cut off by a notch filter and a band of light wavelengths to which the polarization converting efficiencies of first and second specific-wavelength converter elements are 50%, respectively.