Light source apparatus

Optical: systems and elements – Prism

Reexamination Certificate

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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.

REFERENCES:
patent: 4315671 (1982-02-01), Bunch
patent: 6344926 (2002-02-01), Arimoto et al.
patent: 2005/0041287 (2005-02-01), Goto
patent: 2007/0177263 (2007-08-01), Ono
patent: 2008/0151540 (2008-06-01), Noba
patent: 2008/0259244 (2008-10-01), Noba
patent: 63-132215 (1988-06-01), None
patent: 2002-244211 (2002-08-01), None
patent: 2006-228710 (2006-08-01), None
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.

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