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:
Dec. 15, 2020
Filed:
Feb. 15, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Kentaro Mori, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An optical system includes a first lens unit having positive refractive power, and a second lens unit. The first lens unit includes, in order from an object side to an image side, a positive lens, a positive lens, a positive lens, a negative meniscus lens having a concave surface on the image side, a diaphragm SP, and at least one lens. The second lens unit includes a positive lens and a negative lens. At the time of focusing from infinity to close range, the first lens unit moves to the object side to change a distance on the optical axis between the first lens unit and the second lens unit. The optical system satisfies predetermined conditional expressions.