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. 18, 2008
Filed:
Feb. 18, 2005
Toyoyuki Hara, Kai, JP;
Katura Nakajima, Nirasaki, JP;
Tokuro Kusunoki, Enzan, JP;
Yukihiko Hayakawa, Koufu, JP;
Toyoyuki Hara, Kai, JP;
Katura Nakajima, Nirasaki, JP;
Tokuro Kusunoki, Enzan, JP;
Yukihiko Hayakawa, Koufu, JP;
Nisca Corporation, Minamikoma-Gun, Yamanashi-ken, JP;
Abstract
At least a pair of light amount adjusting plates is allocated at peripheral side rim portions of a light path through which light from a light source is projected. These light amount adjusting plates are drivable between a narrow-down position in which they enter into the light path and a retreat position in which they retreat to outside of the light path. A restriction member such as a stopper member restricts a rotation of the light amount adjusting plate at the retreat position, and a holding unit holds the light amount adjusting plate to this restriction member. The restriction member blocks a predetermined angle or further rotation of the light amount adjusting plate, and the holding unit, such as a spring or a magnet, biases the light amount adjusting plate to the restriction member.