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:
Apr. 29, 2003
Filed:
Sep. 13, 2001
Hiroaki Naganuma, Kofu, JP;
Nisca Corporation, Minamikoma-gun, JP;
Abstract
A light quantity control apparatus includes a first base plate, at least one drive device mounted on the first base plate, a shutter blade mounted on the first base plate and engaging the drive device, an intermediate plate disposed above the shutter blade, a diaphragm blade disposed above the intermediate plate, a second base plate disposed above the diaphragm blade, and a protruding guide formed on the first base plate to support the shutter blade thereon. The protruding guide includes a closing region where the shutter blade completely closes the opening, an opening region where the shutter blade opens the opening, and an inclined surface formed at the closing region and/or the opening region. The inclined surface gradually narrowing a gap with respect to the intermediate plate so that a movement of the shutter blade is reduced by the inclined surface to prevent rebounding thereof.