Illumination – Light source and modifier – Including reflector
Reexamination Certificate
2006-11-13
2008-11-11
Sawhney, Hargobind S. (Department: 2885)
Illumination
Light source and modifier
Including reflector
C362S268000, C362S328000, C359S728000
Reexamination Certificate
active
07448774
ABSTRACT:
An illumination optical system, an illumination unit, and an image projection apparatus employing the same are provided. The illumination optical system includes a light source irradiating a diverging light, a reflection optical system condensing the diverging light from the light source, and a lens optical system projecting the light condensed by the reflection optical system. The reflection optical system is comprised of an aspherical concave mirror. The lens optical system comprises a condensing lens having a positive refractive power in a central part and a refractive power of the condensing lens being decreased toward a circumferential part. Optical efficiency may be improved even when a light-emitting surface of the light source is relatively large and the light source cannot be regarded as a point light source.
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Crowe David R
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
Sawhney Hargobind S.
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