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:
Mar. 15, 2005
Filed:
Feb. 19, 2003
Eriko Namazue, Tokyo, JP;
Ichiro Onuki, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Masataka Yashima, Tokyo, JP;
Akio Kashiwazaki, Kanagawa, JP;
Eriko Namazue, Tokyo, JP;
Ichiro Onuki, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Masataka Yashima, Tokyo, JP;
Akio Kashiwazaki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed a light amount adjustment apparatus for adjusting a state of a flux passed through an aperture having a predetermined aperture diameter, the apparatus comprising: a light amount adjustment member in which a first region having a predetermined transmittance to the flux and a second region for blocking the flux are disposed on the same base material. In the light amount adjustment apparatus, although an optical filter is integrally constituted with a diaphragm blade, there is little positional shift of an ND filter, a shape of the ND filter has a degree of freedom, deterioration of resolution of an image is improved for use in optical apparatuses such as a photographing apparatus, optical properties are superior, the whole apparatus can be miniaturized, and cost reduction of a product can be achieved.