Optics: image projectors – Unitary plural refracting surfaces
Reexamination Certificate
2006-09-08
2010-10-05
Epps, Georgia Y (Department: 2878)
Optics: image projectors
Unitary plural refracting surfaces
Reexamination Certificate
active
07806530
ABSTRACT:
A liquid crystal projector device of the present invention includes, on an optical axis of a lamp unit, first and second integrator lenses having a plurality of cells arranged in the form of a matrix, a polarization beam splitter, and a slit plate having a plurality of slit apertures that allow light incidence on the polarization beam splitter. A concave lens for collimating light emitted from the lamp unit is arranged on a front of the lamp unit. The concave lens has a light incidence surface thereof formed with a concavity. The concavity is formed such that the slit apertures of the slit plate allow passage of a larger amount of light than that in the case of using a concave lens without any concavity formed thereon.
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Epps Georgia Y
Le Bao-Luan
Sanyo Electric Co,. Ltd.
Westerman Hattori Daniels & Adrian LLP
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