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. 19, 2025
Filed:
Jul. 06, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Takeharu Nakada, Tochigi, JP;
Takahiro Hatada, 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 having a positive refractive power, a diaphragm, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. A distance between adjacent lens units is changed during focusing. The second lens unit is moved to the image side during focusing from an object at infinity to a short-distance object. The first lens unit includes a positive lens closest to an object and two or more negative lenses. The second lens unit consists of a single negative lens. A predetermined condition is satisfied.