Optical: systems and elements – Prism
Reexamination Certificate
2008-03-05
2010-10-05
Cherry, Euncha P (Department: 2872)
Optical: systems and elements
Prism
Reexamination Certificate
active
07808732
ABSTRACT:
A conventional light source apparatus that combines incident light from a plurality of light sources by using prism sheets has the problem that the beam aspect ratio of incident light is undesirably changed so that exiting light has an extremely elliptical beam profile. The present invention provides a light source apparatus emitting light of circular beam profile having the same beam aspect ratio as that of incident light. The apparatus includes a plurality of light sources K and a plurality of prism sheets PS1and PS2each having a plurality of fine prisms on one surface thereof. The other surface of each prism sheet is a plane surface. The prism sheets are arranged in first and second stages as first and second beam profile transforming units such that their respective prism rows extend perpendicular to each other. The light sources are disposed at the entrance surface side of the first beam profile transforming unit at a predetermined angle thereto.
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Noba, U.S. Patent Application entitled “Light Source Apparatus”, U.S. Appl. No. 11/963,529, filed Dec. 21, 2007.
USPTO Office Action for U.S. Appl. No. 11/963,529, filed Date Dec. 21, 2007, Office Action Date Sep. 30, 2009.
Brinks Hofer Gilson & Lione
Cherry Euncha P
Citizen Electronics Co. Ltd.
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