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:
Dec. 04, 2018
Filed:
Jun. 09, 2016
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Naoto Takehana, Matsumoto, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/14 (2006.01); G02B 13/16 (2006.01); G02B 13/04 (2006.01); G02B 7/04 (2006.01); G03B 21/28 (2006.01); G02B 17/08 (2006.01); G03B 21/00 (2006.01);
U.S. Cl.
CPC ...
G03B 21/142 (2013.01); G02B 7/04 (2013.01); G02B 13/04 (2013.01); G02B 13/16 (2013.01); G02B 17/08 (2013.01); G03B 21/28 (2013.01); G03B 21/005 (2013.01);
Abstract
A feeding mechanism is used to adjust the distance between a reduction side lens group and an object plane for back focus adjustment. A rotation angle adjustment mechanism capable of rotating action independent of rotating action performed in the back focus adjustment is used to adjust the rotation angle by which at least part of the reduction side lens group is rotated.