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. 26, 2011
Filed:
Jun. 28, 2007
Masaki Tamura, Kanagawa, JP;
Masaki Tamura, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
This is addressed to provide a zoom lens which has a good optical performance for imaging device having a large number of pixels even with its simple construction, and which can also be small and thin in structure, and an imaging apparatus using the zoom lens. A zoom lensis composed by arranging, in the following order from an object side, a first lens group GRhaving a weak refractive power, a second lens group GRhaving a negative refractive power, a third lens group GRhaving a positive refractive power, and a fourth lens group GRhaving a positive refractive power, and is configured to perform zooming by moving the second lens group and the third lens group. The first lens group is composed by arranging, in the order from an object side, a single lens Ghaving a a negative refractive power, a prism Gfor folding an optical path, and a single lens Ghaving a a positive refractive power. The second lens group is composed of one single lens Ghaving a negative refractive power, and satisfies the following conditional formula (1):2/<0.4  (1)where trepresents the center thickness of the single lens having a negative refractive power constituting the second lens group, and fw represents the focal length of a whole lens system at a wide-angle position.