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:
Feb. 05, 2019
Filed:
Oct. 18, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Koichi Sakuma, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A zoom lens includes a positive first unit, a negative second unit, and a rear lens system. The rear lens system includes a positive unit A, a negative unit B, and a positive C. The first unit is not moved for zooming, the unit A is moved for zooming, and intervals between adjacent lens units are changed during zooming. The first unit includes positive and negative lenses, the unit C includes positive and negative lenses, the second unit includes negative lenses, and the unit B includes positive lenses. An Abbe number average value of the positive lenses in the first unit, an Abbe number average value of the negative lenses in the second unit, an Abbe number average value of the positive lenses in the unit B, and an Abbe number average value of the positive lenses in the unit C are appropriately set.