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:
Jul. 18, 2023
Filed:
Jun. 11, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Kenji Shinohara, Utsunomiya, JP;
Takeo Mori, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An optical system includes, in order from an object side to an image side, a positive first lens unit (L1), a negative second lens unit (L2), a positive third lens unit (L3), and a negative fourth lens unit (L4), wherein distances between adjacent lens units change during focusing, at least the L2 and the L4 move during focusing, the L4 consists of negative and positive partial units, an air distance between the negative and positive partial units is the largest among those between adjacent lenses in the L4, and 0.45<D4np/D4<0.95 is satisfied, D4 being a distance on an optical axis from a most object-side lens surface to a most image-side lens surface in the L4 and D4np being the air distance between the negative partial unit and the positive partial unit in L4.