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. 27, 2017
Filed:
Jan. 09, 2015
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventors:
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/1335 (2006.01); H04N 9/31 (2006.01); F21V 9/06 (2006.01); G02B 27/10 (2006.01); G03B 21/00 (2006.01); G03B 21/14 (2006.01); G02B 5/28 (2006.01); H04N 5/74 (2006.01); G02B 5/20 (2006.01);
U.S. Cl.
CPC ...
H04N 9/3158 (2013.01); F21V 9/06 (2013.01); G02B 27/102 (2013.01); G03B 21/006 (2013.01); G03B 21/14 (2013.01); H04N 9/3144 (2013.01); G02B 5/208 (2013.01); G02B 5/283 (2013.01); H04N 5/7441 (2013.01);
Abstract
In a projection type display apparatus, a lighting device includes two reflection type cutoff filters (first cutoff filter and reflective second cutoff filter) which block out ultraviolet range light on an output optical path from a light source. A cut on wavelength of the second cutoff filter on the front side is longer than that of the first cutoff filter on the rear side. The two cutoff filters are formed on planar-shaped first faces of a first integrator lens and a second integrator lens. For this reason, both input faces of the two cutoff filters are orthogonal to an apparatus optical axis.