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. 22, 2016
Filed:
Dec. 29, 2014
Applicant:
Yoshifumi Sudoh, Saitama, JP;
Inventor:
Yoshifumi Sudoh, Saitama, JP;
Assignee:
RICOH COMPANY, LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 27/42 (2006.01); G02B 15/173 (2006.01); G02B 13/00 (2006.01); G02B 13/18 (2006.01); G02B 27/00 (2006.01); G02B 9/36 (2006.01); G02B 5/00 (2006.01); G02B 9/34 (2006.01); G02B 15/20 (2006.01); G02B 27/09 (2006.01); G02B 5/18 (2006.01); G02B 15/24 (2006.01); G02B 7/00 (2006.01);
U.S. Cl.
CPC ...
G02B 27/4211 (2013.01); G02B 15/173 (2013.01); G02B 5/005 (2013.01); G02B 5/1814 (2013.01); G02B 7/008 (2013.01); G02B 9/34 (2013.01); G02B 9/36 (2013.01); G02B 13/002 (2013.01); G02B 13/006 (2013.01); G02B 13/009 (2013.01); G02B 13/0015 (2013.01); G02B 13/0045 (2013.01); G02B 13/0055 (2013.01); G02B 13/18 (2013.01); G02B 15/14 (2013.01); G02B 15/20 (2013.01); G02B 15/24 (2013.01); G02B 27/0025 (2013.01); G02B 27/0037 (2013.01); G02B 27/0056 (2013.01); G02B 27/0062 (2013.01); G02B 27/0944 (2013.01); G02B 27/42 (2013.01); G02B 27/4205 (2013.01);
Abstract
A zoom lens unit comprises a first and fourth lens groups with positive refractive power, a second and third lens groups with negative refractive power. The first and the fourth lens groups are fixed, the second lens group moves toward an image side and the fourth lens group moves when changing a magnification ratio from a wide-angle end to a telephoto end. The fourth lens group includes a negative resin lens and at least one positive lens. At least one of said positive lenses fulfills following conditions:1.40<<1.6565.0<ν<100.00.015<−(−0.001802×ν+0.6483)<0.060