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. 11, 2007
Filed:
Apr. 21, 2006
Yasuzi Ogata, Akiruno, JP;
Yasuzi Ogata, Akiruno, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The invention is concerned with a zoom lens that is well fit for a digital type single-lens reflex camera, has improved optical performance, and is bright all over the zooming zone. The zoom lens comprises a first group Gof positive power, a second group Gof negative power and a third group Gof positive power. Upon zooming, the first group Gremains fixed, and the second Gand the third group Gare movable. The first group Gcomprises a subgroupA of negative power and a subgroupB of positive power, and the second group Gcomprises a first negative lens, a cemented positive lens, a second negative lens and a third negative lens. The zoom lens satisfies conditions (1) and (2) with respect to the focal length of the subgroupA and the focal length of the second group G
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile