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:
Mar. 04, 2015
Kazuyasu Ohashi, Chiba, JP;
Kazuyasu Ohashi, Chiba, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A zoom lens unit includes, in order from an object side to an image side, a first lens group having positive refractive power and a focus function, a second lens group having negative refractive power, which moves when changing a magnification, a third lens group which moves when changing a magnification, and a fourth lens group having positive refractive power, which is fixed when changing a magnification, wherein the following condition (1) is fulfilled:||<0.14  (1)where Mrepresents an imaging magnification of the second lens group at a wide-angle end, Mrepresents an imaging magnification of the third lens group at the wide-angle end, and Mrepresents an imaging magnification of the fourth lens group at the wide-angle end.