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:
Jan. 01, 2019
Filed:
May. 13, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Kaoru Eguchi, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A partial lens unit St includes one or more positive lenses that are appropriately set based on a focal length fof a first lens unit, a focal length fof a second lens unit, an overall lens length L, a focal length f of an imaging optical system of when focused on an infinite-distance object, a focal length fof an i-th positive lens in an i-th position, among the positive lenses, counted in order from an object side to an image side, an Abbe number and an anomalous partial dispersion ratio difference νand Δθof a material for the i-th positive lens, and the total number n of the positive lenses included in the one or more partial lens units St.