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. 16, 2010
Filed:
Aug. 16, 2006
Kesatoshi Takeuchi, Shiojiri, JP;
Hiroshi Kuriyama, Shimosuwa-machi, JP;
Kesatoshi Takeuchi, Shiojiri, JP;
Hiroshi Kuriyama, Shimosuwa-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An optical diaphragm for adjusting a light quantity of an incident light beam includes: a plurality of light-shielding vanes attached to a circumferential portion of an aperture of a base plate in a manner rotatable along a plane orthogonal to an optical axis of the light beam. The light-shielding vanes may be rotated to change an aperture area of the aperture of the base plate for transmitting the light beam. The plurality of light-shielding vanes each include a vane plate for intercepting the incident light beam; and a bearing integrally provided to the vane plate, the bearing each allowing a rotary shaft to be inserted therein so as to be supported by the rotary shaft. The vane plate is perpendicularly attached to the bearing. The plurality of light-shielding vanes move parallel to each other in an opening and closing direction thereof without crossing with each other.