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:
May. 21, 2019
Filed:
Feb. 15, 2017
Fujifilm Corporation, Tokyo, JP;
Ukyo Tomioka, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
The zoom lens includes, in order from an object side, a positive first lens group G, a negative second lens group G, a positive third lens group G, a diaphragm, and a fourth lens group G. During zooming, only the second lens group Gand the third lens group Gmove. The first lens group Gincludes, in order from the object side, a cemented lens that is formed by cementing a positive lens and a negative meniscus lens convex toward the object side, a positive lens, and a negative lens. A conditional expression (1): −0.8<f1a/f1b<0 is satisfied, where f1a is a composite focal length of the first to third lenses from the object side of the first lens group G, and f1b is a focal length of the fourth lens.