Optics: image projectors – Reflector – Plural
Reexamination Certificate
2011-04-12
2011-04-12
Epps, Georgia Y (Department: 2878)
Optics: image projectors
Reflector
Plural
C353S085000, C353S097000, C359S859000, C359S863000
Reexamination Certificate
active
07922340
ABSTRACT:
A projection optical system that receives light from a display element to project an image displayed by the display element onto a screen with enlargement at a varying magnification achieved by varying the projection distance to the screen has: a refractive optical system composed of one or more refractive lenses and having a positive optical power; and a concave-surfaced mirror disposed to the screen side of the refractive optical system and having a plane-symmetric reflective surface. The projection optical system includes at least one optical element designed to be movable for focusing. The projection optical system forms an intermediate image between the refractive optical system and the concave-surfaced mirror. Moreover, a prescribed conditional formula is fulfilled.
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Japanese “Notification of Grounds for Rejection” dated Jan. 20, 2009 for counterpart Japanese Application No. 2008-025615; Together with an English-language translation thereof.
Cruz Magda
Epps Georgia Y
Konica Minolta Opto Inc.
Sidley Austin LLP
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