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. 24, 2015
Filed:
Nov. 20, 2012
Canon Kabushiki Kaisha, Tokyo, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens, in order from an object side to an image side, includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, the first lens unit is fixed and at least the second and fourth lens unit are moved during zooming, the third lens unit is configured by a cemented lens formed by cementing a negative lens having a meniscus shape convex towards the object side and a positive lens, the fourth lens unit is configured by a cemented lens formed by cementing a negative lens having a meniscus shape convex towards the object side and a positive lens, and focal lengths fand fof the third lens unit and the fourth lens unit are appropriately set.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile