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. 20, 2024
Filed:
Feb. 09, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Yuki Shinzato, Tochigi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical system includes, in order from an object side to an image side, a first lens unit consisting of one or more negative lenses, a second lens unit with positive refractive power disposed so as to have a first air space from the first lens unit, and a third lens unit disposed so as to have a second air space from the second lens unit. The first air space is a widest air space of air spaces formed closer to the object side than a positive lens disposed closest to the object side in the optical system. A surface of the first lens unit closest to the image side is concave. The third lens unit consists of a lens element with negative refractive power and having a concave surface on the object side. The optical system satisfies predetermined inequalities.