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:
Mar. 17, 2009
Filed:
Nov. 26, 2007
Hiroshi Omichi, Tokyo, JP;
Hiroshi Omichi, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A zoom lens having a plurality of lens groups which performs zooming by changing distances between groups includes a reflective member to bend an optical axis which passes through the plurality of the lens groups. The plurality of lens groups includes, in order from an object side to an image plane side: a first lens group having a positive refractive power and fixed in position; a second lens group having a negative refractive power and to be moved along the optical axis direction when zooming; a third lens group having a positive refractive power and fixed in position; a fourth lens group having a positive refractive power and to be moved in the optical axis direction to compensate a position change of the image plane when zooming and focusing; and a fifth lens group having a negative refractive power and fixed in position when zooming. A ratio of the focal distance of the third lens group and the focal distance of the whole lens system is in a range of 3.4 to 4.0.