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:
Jul. 21, 2015
Filed:
Dec. 27, 2011
Satoshi Kuzuhara, Osaka, JP;
Katsu Yamada, Osaka, JP;
Shinji Yamaguchi, Osaka, JP;
Tsutomu Iwashita, Osaka, JP;
Satoshi Kuzuhara, Osaka, JP;
Katsu Yamada, Osaka, JP;
Shinji Yamaguchi, Osaka, JP;
Tsutomu Iwashita, Osaka, JP;
Abstract
A zoom lens system comprising: a first lens unit having negative optical power; a second lens unit having positive optical power; and a third lens unit having positive optical power, wherein the first to third lens units are individually moved along an optical axis to vary magnification in zooming, each lens unit includes at least one lens element that satisfies the conditions: nd≦1.67, vd<59 and 0.000<PgF+0.002×vd−0.664 (nd, vd and PgF: a refractive index to the d-line, an Abbe number to the d-line and a partial dispersion ratio, of the lens element), and the condition: 0.31<Ir/√(|f×f|) (Ir=f×tan(ω), fand ω: a focal length of the entire system and a half value of maximum view angle, at a telephoto limit, fand f: a focal length of each of the first lens unit and the second lens unit) is satisfied; an imaging device; and a camera are provided.