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. 21, 2021
Filed:
May. 02, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Takayoshi Yokoyama, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An optical system includes a first lens unit having positive refractive power, a second lens unit having positive refractive power that is moved during focusing, and a third lens unit having negative refractive power that are arranged in order from an object side to an image side. A distance between adjacent lens units on an optical axis of the optical system is varied during focusing. The first lens unit consists of a diffractive optical element and a negative lens that are arranged in order from the object side to the image side. The negative lens has a meniscus shape in which a concave surface faces the object side.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile