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. 25, 2015
Filed:
Mar. 18, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Hirofumi Abe, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An image pickup lens includes, in order from an object side; a negative front lens unit; a stop; and a positive rear lens unit, wherein the front lens unit includes a negative front first lens, a negative front second lens, and a positive front third lens, in order from the object side, wherein the rear lens unit includes a positive rear first lens having at least one aspherical surface and a cemented lens made up of a positive rear second lens and a negative rear third lens, in order from the object side, and wherein an Abbe constant of a positive lens disposed on the most object side, an Abbe constant of a negative lens disposed on the most image side, a focal length of the front lens unit, and a focal length of the rear lens unit are appropriately set.