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:
Aug. 18, 2009
Filed:
Dec. 07, 2007
Fumikazu Kanetaka, Shibuya-ku, JP;
Toshio Takahashi, Shibuya-ku, JP;
Tomoyuki Satori, Shibuya-ku, JP;
Fumikazu Kanetaka, Shibuya-ku, JP;
Toshio Takahashi, Shibuya-ku, JP;
Tomoyuki Satori, Shibuya-ku, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The invention relates to a less costly zoom lens that can offer a sensible tradeoff between size reductions and high zoom ratios with a well-kept image quality, and that lends itself to an electronic imaging device such as a CCD or CMOS. The zoom lens comprises a positive first lens group G, a negative second lens group G, a positive third lens group Gand a positive fourth lens group G, wherein zooming is implemented by changing the space between adjacent lens groups. The first lens group Gcomprises one positive lens, the second lens group Gcomprises two lenses, and the fourth lens group Gcomprises one positive lens. The zoom lens satisfies condition (1) needed for making sure an ideal situation for the zoom ratio and low costs and condition (2) needed for the first lens group to comprise a minimum one lens and to hold back chromatic aberration of magnification as much as possible.