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. 27, 2019
Filed:
Mar. 22, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Yuki Nagao, Utsunomiya, JP;
Makoto Hayakawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A light amount adjustment apparatus includes an aperture unit including a plurality of blade members and a movable member, the movable member for changing a size of an aperture formed by the plurality of blade members, a driving unit including a driving shaft and configured to drive the movable member, and a detection unit including a detection target member and a detection sensor, and configured to detect a driving amount of the driving unit by detecting a driving amount of the detection target member with use of the detection sensor, wherein the aperture unit, the driving unit, and the detection unit overlap one another, as viewed in a direction along a central axis of the aperture, wherein the detection target member is engaged with the driving shaft, and wherein an outer diameter of the detection unit is smaller than an outer diameter of the driving unit.