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:
Sep. 06, 2011
Filed:
Dec. 24, 2009
Kazunori Ohno, Saitama, JP;
Kazunori Ohno, Saitama, JP;
Fujinon Corporation, Saitama, JP;
Abstract
On condition that a first lens group adopts at least one plastic lens; a second lens group adopts at least any two adjacent plastic lenses; the first lens group monotonously moves from an object side to an image plane side in a zooming; the second lens group monotonously moves from the image plane side to the object side; wherein fw/fpi represents a ratio of refractive power of the entire system achieved at a wide angle end to refractive power of the respective lenses; Prepresents a total of fw/fpi of the plastic lenses of the first lens group; and Prepresents a total of fw/fpi of the plastic lenses of the second lens group, the following conditional expressions −0.22<P<−0.01 and −0.15<P<−0.03, are both fulfilled.