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:
Oct. 19, 2010
Filed:
Aug. 25, 2008
Masahito Watanebe, Shibuya-ku, JP;
Tomoyuki Satori, Shibuya-ku, JP;
Masahito Watanebe, Shibuya-ku, JP;
Tomoyuki Satori, Shibuya-ku, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The invention relates to a zoom lens and an imaging apparatus incorporating the same, and more particularly to a zoom lens of small format that lends itself to imaging apparatus inclusive of video cameras and digital cameras. The zoom lens comprises, in order from its object side, a first lens group Gof positive refracting power, a second lens group Gof negative refracting power and a third lens group Gof positive refracting power. Zooming is implemented by changing the space between the respective lens groups. The first lens group Gcomprises one negative lens and one positive lens in order from the object side. The zoom lens satisfies conditions (1) and (2):5<50.0  (1)1.4<N<1.7  (2)where fis the focal length of the whole zoom lens system at a wide-angle end, fis the focal length of the whole zoom lens system at a telephoto end, and Nis the d-line refractive index of the positive lens in the first lens group.