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:
Apr. 07, 2015
Filed:
Mar. 29, 2013
Pentax Ricoh Imaging Company, Ltd., Tokyo, JP;
Masakazu Saori, Saitama, JP;
Pentax Ricoh Imaging Company, Ltd., Tokyo, JP;
Abstract
A macro lens system includes a positive first lens group, and a positive or negative second lens group, in that order from the object side, wherein at least the first lens group moves toward the object side when focusing on an object at infinity to an object at a close distance, wherein the second lens group includes a negative first sub-lens group and a positive second sub-lens group, in that order from the object side, wherein the following condition (1) is satisfied:−5.0<<−0.8  (1),wherein fA designates the focal length of the first sub-lens group, and fi designates the focal length of the entire the macro lens system when focusing on an object at infinity.