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, 2017
Filed:
Feb. 03, 2016
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Nobutaka Minefuji, Azumino, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 3/00 (2006.01); G02B 9/00 (2006.01); G02B 17/00 (2006.01); G02B 17/08 (2006.01); G02B 1/04 (2006.01); G02B 15/16 (2006.01); G02B 15/20 (2006.01); G02B 27/00 (2006.01); G02B 27/09 (2006.01); G02B 13/00 (2006.01); G02B 15/00 (2006.01); G02B 3/04 (2006.01); G02B 5/00 (2006.01); G02B 7/04 (2006.01); G02B 15/167 (2006.01); G03B 21/28 (2006.01);
U.S. Cl.
CPC ...
G02B 17/0896 (2013.01); G02B 1/041 (2013.01); G02B 15/161 (2013.01); G02B 15/20 (2013.01); G02B 27/0025 (2013.01); G02B 3/04 (2013.01); G02B 5/005 (2013.01); G02B 7/04 (2013.01); G02B 13/002 (2013.01); G02B 13/007 (2013.01); G02B 13/0045 (2013.01); G02B 13/0065 (2013.01); G02B 15/00 (2013.01); G02B 15/167 (2013.01); G02B 17/08 (2013.01); G02B 27/0977 (2013.01); G03B 21/28 (2013.01);
Abstract
In a 1-2nd lens group, an aspherical resin lens is disposed on the outermost enlargement side, an enlargement-side fixed lens group (second fixed lens group) as a fixed group is disposed, a moving lens group, which move when focusing is performed in response to the magnification change, is disposed further on the reduction side from the second fixed lens group. Even in a case where the second optical group is configured of one mirror, it is possible for a primary image to have appropriate aberration and to hereby reduce aberration of an image which is finally projected onto a screen through the second optical group.