Light source apparatus and image projection apparatus
A light source device and technology for converting light, which can be used in projection devices, optics, photography, etc., and can solve the problems of reduced light collection ratio and light utilization efficiency (lower lighting efficiency) of the lighting optical system.
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no. 1 example
[0028] figure 1 The configuration of the light source device (light source unit) 100 according to the first embodiment of the present invention is illustrated. The light source 101 includes, as a plurality of light emitting elements, blue laser diodes that emit laser beams as linearly polarized light. Excitation light (first light) from light source 101 is converted into parallel light by collimator optical system 102 , reflected by dichroic PBS 103 as an optical element, and irradiated onto wavelength conversion element 105 through condensing optical system 104 . This embodiment uses a blue laser diode as the light emitting element of the light source 101, but any light emitting element other than a laser diode may be used as long as it emits blue linearly polarized light.
[0029] Figure 2A The optical characteristics of the dichroic PBS 103 are illustrated for P-polarized light and S-polarized light. The axis of abscissa represents wavelength (nm), and the axis of ordin...
no. 2 example
[0039] Figure 4 The configuration of a light source unit 100A according to the second embodiment of the present invention is illustrated. This embodiment transmits the excitation light from the light source (light emitting element) 101 through the dichroic PBS (polarizing beam splitter) 201 as an optical element, while the fluorescent light and non-converted light from the wavelength conversion element 105 are transmitted by the dichroic PBS 201 Reflected and emitted to the outside of the light source unit.
[0040] Dichroic PBS 201 has Figure 5A Optical properties shown in . The axis of abscissa represents wavelength (nm), and the axis of ordinate represents reflectance. The dichroic PBS 201 transmits the excitation light as P-polarized light from the light source 101 through the dichroic PBS 201 , and makes the excitation light enter the wavelength conversion element 105 . Unlike the first embodiment, the wavelength conversion element 105 generates fluorescent light of...
no. 3 example
[0044] Figure 6 The configuration of a wavelength conversion element 105A for a light source unit according to a third embodiment of the present invention is illustrated. The configuration of the light source unit other than the wavelength conversion element 105A is the same as that of the first embodiment ( figure 1 ) with the same configuration.
[0045] The wavelength conversion element 105A includes a wavelength conversion layer 301 , a dichroic mirror 1052 , a quarter-wavelength plate 1053 , and a reflective diffusion plate 1054 in this order from the incident side of the excitation light. The wavelength conversion layer 301 is made of a wavelength conversion material including quantum rods, absorbs a P-polarized light component in incident excitation light, converts the wavelength of the light, and emits fluorescent light as P-polarized light.
[0046] The S-polarized light component in the excitation light has a wavelength not converted by the wavelength conversion l...
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