Optics: image projectors – Shutter
Reexamination Certificate
2005-02-18
2008-03-18
Fuller, Rodney (Department: 2862)
Optics: image projectors
Shutter
C353S097000
Reexamination Certificate
active
07344255
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.
REFERENCES:
patent: 3771867 (1973-11-01), Moser
patent: 5057864 (1991-10-01), Kijima et al.
patent: 6854851 (2005-02-01), Yamasaki et al.
patent: 7055966 (2006-06-01), Momose et al.
patent: 7182470 (2007-02-01), Hashimoto et al.
patent: 7185990 (2007-03-01), Koga et al.
patent: 2000-28988 (2000-01-01), None
patent: 2003-121938 (2003-04-01), None
Hara Toyoyuki
Hayakawa Yukihiko
Kusunoki Tokuro
Nakajima Katura
Fuller Rodney
Kanesaka Manabu
Nisca Corporation
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