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:
Jun. 17, 2014
Filed:
Apr. 13, 2012
Shoichi Takemoto, Utsunomiya, JP;
Tomoyuki Nakamura, Utsunomiya, JP;
Shoichi Takemoto, Utsunomiya, JP;
Tomoyuki Nakamura, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens includes a first lens unit, a second lens unit, a third lens unit, a fourth lens unit and a fifth lens unit. In the zoom lens, air intervals LLbetween the second lens unit and the third lens unit and between the third lens unit and the fourth lens unit at a wide-angle end, a focal length fof the first lens unit, a combined focal length fof the second lens unit and the third lens unit at the wide-angle end, a focal length fw of the whole system at the wide-angle end, a zoom ratio Z, and a smallest value Lof the air interval between the second lens unit and the third lens unit in a wide angle zoom range in which a magnification-varying ratio relative to that at the wide-angle end ranges from Zto Zare appropriately set.