LIGHT SOURCE DEVICE AND PROJECTOR

摘要

A light source device includes a light source, a phosphor unit that includes a phosphor region and a reflection region and that is movable so that blue light from the light source is sequentially radiated to the phosphor region and the reflection region, and a dichroic mirror that guides the first linearly polarized light of the blue light from the light source to the phosphor unit and on which fluorescent light from the phosphor region and the blue light from the reflection region are made incident. A ¼ wavelength plate is provided on an optical path between the dichroic mirror and the phosphor unit, and a polarized light separating element is provided on an optical path between the dichroic mirror and the light source. The dichroic mirror is disposed so that the incident angle of the central beam of the blue light from the reflection region is larger than 45°.

主权项

1. A light source device comprising:
a light source that emits blue light having a peak wavelength in a blue wavelength region; a polarized light separating element that is provided to reflect or transmit first linearly polarized light, the polarized light separating element reflecting or transmitting first linearly polarized light of the blue light; a dichroic mirror that is provided to reflect or transmit the first linearly polarized light, the dichroic mirror reflecting or transmitting reflected light or transmitted light from the polarized light separating element; a phosphor unit that includes a phosphor region in which a phosphor is provided and a reflection region in which incident light is reflected, the phosphor unit being movable so that reflected light or transmitted light from the dichroic mirror is sequentially radiated to the phosphor region and the reflection region; and a ¼ wavelength plate that is provided on an optical path between the dichroic mirror and the phosphor unit, wherein the dichroic mirror is disposed so that an incident angle of a central beam of the blue light that is reflected in the reflection region is larger than 45°.