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. 09, 2005
Filed:
May. 22, 2001
Naoya Kaneda, Kanagawa, JP;
Naoya Kaneda, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A light amount adjusting apparatus is constructed by a driving source, a plurality of light shielding members each having a notched portion adapted to form a light passing port, in which the light shielding member is moved by being driven by the driving source to thereby vary an area of the light passing port which is formed in the notched portion, and at least one filter provided for the notched portions of the plurality of light shielding members, in which the filter is provided so as to cover a part of the notched portion and has a first area having first light transmittance and a second area having second light transmittance lower than the first light transmittance. When the area of the light passing port which is formed by the light shielding members is in a maximum state, a relation (A<A<A) is satisfied assuming that, in the light passing port, Aindicates an area of a portion which is not covered with the filter, Aindicates an area of a portion covered with the first area of the filter, and Aindicates an area of a portion covered with the second area of the filter.