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:
Feb. 03, 2009
Filed:
Jun. 15, 2005
Chen-cheng Liao, Taichung, TW;
Chen-cheng Liao, Taichung, TW;
Asia Optical Co., Inc, Taichung, TW;
Abstract
A compact zoom lens includes, from the object side to the image side, a negative first lens group (), a positive second lens group () and a positive third lens group (). The first lens group is stationary, and both the second and third lens groups are movable along the optical axis. The compact zoom lens is zoomed by varying the distance between the first and second lens groups, and the focal length is adjusted by varying the distance between the second and third lens groups. The zoom lens is composed of only four single lenses in three groups, of which three () are plastic aspheric lenses and one () is a glass spherical lens.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile