Patent ID: 8366278

Claim:
A light source device comprising: a light emitting plate that has a plurality of segment regions on a substrate, at least one of the segment regions being formed as a reflective portion on which a fluorescent substance layer is formed to receive excitation light and emit light of a predetermined wavelength band in response to the received excitation light, and at least one of the segment regions being formed as a transmissive portion that transmits light; a light source that irradiates the fluorescent substance layer of the light emitting plate with the excitation light; a dichroic mirror that is disposed between the light source and the light emitting plate to transmit the excitation light and reflect fluorescent light from the fluorescent substance layer; and an optical device that condenses the excitation light transmitted by the transmissive portion of the light emitting plate and the fluorescent light reflected by the dichroic mirror on a single optical path to form a condensed light and radiate the condensed light toward the same direction.