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:
Nov. 07, 2017
Filed:
Jun. 22, 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 3/00 (2006.01); G02B 9/00 (2006.01); G02B 17/00 (2006.01); G03B 21/14 (2006.01); G02B 27/00 (2006.01); G03B 21/28 (2006.01); G02B 15/16 (2006.01); G02B 15/20 (2006.01); G02B 7/04 (2006.01); G03B 21/00 (2006.01); H04N 9/31 (2006.01); G02B 3/02 (2006.01); G02B 13/00 (2006.01); G02B 17/08 (2006.01); G02B 13/16 (2006.01); G02B 15/14 (2006.01); G02B 13/22 (2006.01); G03B 5/00 (2006.01); G02B 5/00 (2006.01); G02B 13/18 (2006.01); G03B 17/54 (2006.01);
U.S. Cl.
CPC ...
G03B 21/147 (2013.01); G02B 7/04 (2013.01); G02B 15/161 (2013.01); G02B 15/20 (2013.01); G02B 17/0852 (2013.01); G02B 17/0896 (2013.01); G02B 27/0025 (2013.01); G03B 21/006 (2013.01); G03B 21/28 (2013.01); H04N 9/315 (2013.01); G02B 3/02 (2013.01); G02B 5/005 (2013.01); G02B 13/009 (2013.01); G02B 13/0045 (2013.01); G02B 13/0065 (2013.01); G02B 13/16 (2013.01); G02B 13/18 (2013.01); G02B 13/22 (2013.01); G02B 15/14 (2013.01); G02B 17/08 (2013.01); G02B 17/0816 (2013.01); G03B 5/00 (2013.01); G03B 17/54 (2013.01);
Abstract
The 1-2nd lens group is divided into three lens groups which move when focusing is performed during the magnification change. Even in a case in which the second optical group is formed of one mirror, it is possible for a primary image to contain appropriate aberration and to hereby reduce aberration of an image which is finally projected onto a screen through the second optical group.