LIGHT SOURCE DEVICE AND PROJECTION-TYPE DISPLAY DEVICE
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United States of America Patent
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Oct 27, 2016
app pub date -
Jan 8, 2014
filing date -
Jan 8, 2014
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Abstract
A light source device is equipped with a light source main unit, an optical element, a phosphor unit, and a condensing element. The optical axis of the light source main unit is shifted from the optical axis of the condensing element. The reflection direction of light of a first wavelength in a reflecting region intersects direction of the light of the first wavelength incident to the reflecting region. In response to the irradiation of the light of a first wavelength, fluorescent regions emit light of a second wavelength in a direction opposite to the direction of light of the first wavelength incident to the reflecting region and in the direction of reflection of light of the first wavelength in the reflecting region. In addition, fluorescent regions are capable of reflecting light of the second wavelength that is incident to the fluorescent regions. The direction of reflection of light of the second wavelength in the optical element is the same as the direction of light of the first wavelength that has passed through the optical element.
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