Light source device using monochromatic light to excite stationary phosphor layers

摘要

A light source device has a first monochromatic light source group, a second monochromatic light source group, a polarization selection and wavelength selection element, a first phosphor layer, and a second phosphor layer. The first monochromatic light source group outputs first polarized light having a fixed polarization direction. The second monochromatic light source group outputs second polarized light having a fixed polarization direction. The first phosphor layer emits light in a first wavelength band. The second phosphor layer emits light in a second wavelength band. The polarization and wavelength selection element directs the first polarized light onto the first phosphor layer by transmitting the first polarized light and directs the second polarized light onto the second phosphor layer by reflecting the second polarized light, reflects the light in the first wavelength band and transmits the light in the second wavelength band.

主权项

1. A light source device comprising:
a first monochromatic light source group for outputting first monochromatic light; a second monochromatic light source group for outputting second monochromatic light having a shorter center wavelength than a center wavelength of the first monochromatic light; a first selection element; a first phosphor layer for emitting light in a first wavelength band when excited; and a second phosphor layer for emitting light in a second wavelength band having a shorter center wavelength than a center wavelength of the light in the first wavelength band when excited; wherein the first selection element
directs the first monochromatic light onto the first phosphor layer by transmitting the first monochromatic light and reflects the light in the first wavelength band emitted from the first phosphor layer, and directs the second monochromatic light onto the second phosphor layer by reflecting the second monochromatic light and transmits the light in the second wavelength band emitted from the second phosphor layer, ordirects the first monochromatic light onto the first phosphor layer by reflecting the first monochromatic light and transmits the light in the first wavelength band emitted from the first phosphor layer, and directs the second monochromatic light onto the second phosphor layer by transmitting the second monochromatic light and reflects the light in the second wavelength band emitted from the second phosphor layer.