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:
Oct. 18, 2016
Filed:
Oct. 17, 2014
Applicant:
Kazuyasu Ohashi, Funabashi, JP;
Inventor:
Kazuyasu Ohashi, Funabashi, JP;
Assignee:
RICOH COMPANY, LTD., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/00 (2006.01); G02B 15/17 (2006.01); G02B 15/16 (2006.01); G02B 15/20 (2006.01); G02B 15/173 (2006.01); G02B 13/00 (2006.01);
U.S. Cl.
CPC ...
G02B 15/17 (2013.01); G02B 13/009 (2013.01); G02B 15/00 (2013.01); G02B 15/16 (2013.01); G02B 15/173 (2013.01); G02B 15/20 (2013.01);
Abstract
A zoom lens includes, in order from an object side to an image surface side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power, the second lens group and the third lens group are moved such that the second lens group is located on a most object side at a wide-angle end and the third lens group is located on a most image surface side at a telephoto end during zooming.