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:
Oct. 28, 2003
Filed:
Jan. 23, 2003
Applicant:
Inventors:
Tomiyoshi Ushiyama, Minowa-machi, JP;
Akitaka Yajima, Tatsuno-machi, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 2/100 ;
U.S. Cl.
CPC ...
G03B 2/100 ;
Abstract
The invention accurately sets a polarization direction of a polarization element, and prevents deterioration of the usage efficiency of the light and a reduction in image contrast. Field lenses are provided on a projection display device. A polarizer is placed on a flat surface of a field lens. The flat surface of the field lens is provided with a reference shape to place the polarizer at the end thereof. The reference shape may be one or more planes provided on the end of the field lens. In addition, the reference shape may be a straight line drawn on the flat surface of the field lens.