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:
May. 31, 2022
Filed:
Feb. 19, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A zoom lens includes, from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, and a positive third lens unit moving for zooming. The second lens unit includes a negative lens closest to the object side, the third lens unit consists of a-sub-lens unit and a-sub-lens unit from the object side. Conditional expressions−18.0<1/2<−3.0,0.2<21/2<3.6,−0.95<21/2<−0.25,7.0<β2/β2<125.0, and0.3<31/32<2.5,are satisfied where f1, f2, and f21 are the focal lengths of the first lens unit, the second lens unit, and the negative lens, r2 is an image-side radius of curvature of the negative lens, β2w and β2t are the lateral magnifications of the second lens unit at the wide angle end and the telephoto end, and f31 and f32 are the focal lengths of the-sub-lens unit and the-sub-lens unit.