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. 30, 2009
Filed:
Feb. 28, 2008
Yuichi Muramatsu, Saitama, JP;
Yuichi Muramatsu, Saitama, JP;
Tamron Co., Ltd., Saitama-shi, Saitama, JP;
Abstract
Zoom lens, using lens eccentricity to compensate for image blur, has four groups of lens pieces; 1, 3and 4, each with positive refractive power, and 2with negative refractive power, arranged in series on 'closer to a subject first' basis. Moving from wide to telephoto causes 1and 2groups to separate from each other, 2and 3groups to come closer to each other, and 3and 4groups to come closer to each other. The leading subset of the 4group is closest to the subject, includes lens elements of positive and negative refractive power cemented together, and serves as an anti-tremor shift lens. The zoom lens satisfies the follows:1.45<41/<1.8where f41 is a focal length of the leading subset in the 4th lens group, and fw is a focal length of the lens optics as a whole in the wide-angle mode.