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:
Sep. 22, 2009
Filed:
Nov. 16, 2007
Eiji Shirota, Shibuya-ku, JP;
Eiji Shirota, Shibuya-ku, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The present invention relates to a low-cost zoom lens which has high optical performance specifications such as a wide angle of view and a high zoom ratio of as high as 5, is extremely small in depth and ensures that the optical path of the optical system can easily be bent by a reflecting optical element. A zoom lens includes a first lens group Gwith a positive power, a second lens group Gwith a negative power, a third lens group Gwith a positive power, a fourth lens group Gwith a positive power, a fifth lens group Gwith a negative power, and a sixth lens group Gwith a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group Gremains fixed relative to an image surface I and at least second and fourth lens groups Gand Gmove, the first lens group Gincludes, in order from the object side, a negative lens, a reflecting optical element P for bending an optical path, and a positive lens, and conditional expression (1) is satisfied.