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. 06, 2006
Filed:
Jun. 29, 2004
Applicant:
Hiroki Koba, Osaka, JP;
Inventor:
Hiroki Koba, Osaka, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/14 (2006.01); G03B 21/20 (2006.01); F21V 17/02 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
Abstract
A shutter device comprises a plurality of shutters. Each of the shutters is provided at a position in the vicinity of a fly's eye lens positioned on the side of a polarization conversion system (one of fly's eye lenses in an integrator lens) and not preventing the passage of effective illuminating light. Each of the shutters is constructed as a first shutter or a second shutter. The first shutter is constructed so as to block an upper one-third region and a lower one-third region of the fly's eye lens, and the second shutter is constructed so as to block an intermediate one-third region of the fly's eye lens