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:
Nov. 18, 1997
Filed:
Aug. 09, 1994
Hiroshi Akada, Kanagawa-ken, JP;
Tatsuo Chigira, Kanagawa-ken, JP;
Hironori Takano, Kanagawa-ken, JP;
Masahiko Tsuzuki, Saitama-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
To reduce the size of an optical apparatus having an amount-of-light adjusting device, there is provided an arrangement which comprises a light-blocking member arranged to move to vary a light-blocking area and a drive part for driving the light block member. The drive part includes a stator formed by a first stator piece having a first stator pole and a second stator piece having a second stator pole and a rotor made eccentric with respect to a central position of the first stator piece and the second stator piece. The drive part is disposed rearward of the light-blocking member in the direction of the optical axis.