Abstract: A light source device 20 includes light source units 200a to 200d, lenses 203a, 203b, and 205, and mirrors 204a and 204b. Light source units 200a, 200b and/or light source units 200c, 200d are placed such that the light from units 200a to 200d either enters lens 203a at a position deviated from the optical axis of lens 203a or enters lens 203b at a position deviated from the optical axis of lens 203b.

Abstract: A light source device 20 includes light source units 200a to 200d, lenses 203a, 203b, and 205, and mirrors 204a and 204b. Light source units 200a, 200b and/or light source units 200c, 200d are placed such that the light from units 200a to 200d either enters lens 203a at a position deviated from the optical axis of lens 203a or enters lens 203b at a position deviated from the optical axis of lens 203b.

Abstract: The projection image display apparatus of the disclosure includes a light source, a projection optical system that projects light entering an incident port, an optical modulator element, and wavelength selection filter. The optical modulator element includes multiple mirrors on its base. These mirrors are driven to switch, based on an image signal, between the ON state for reflecting a light entering from a light source toward the incident port of the projection optical system and the OFF state for reflecting a light entering from the light source in a direction other than the incident port of the projection optical system. In light entering from the light source to irradiate the optical modulator element, the wavelength selection filter reflects a light wavelength component that will be planar reflection light after being reflected on the base and entering the incident port of the projection lens.

Abstract: A phosphor wheel device includes a phosphor and a substrate which has a disc shape and on which the phosphor is provided, and the phosphor is provided in at least a portion of a circumference of a circle on the substrate. The circle is centered on the center of a rotational shaft of the substrate. The substrate includes a first opening and a plurality of second openings, and the plurality of second openings extend radially with respect to the center of the rotational shaft.

Abstract: A phosphor wheel device includes a phosphor and a substrate which has a disc shape and on which the phosphor is provided, and the phosphor is provided in at least a portion of a circumference of a circle on the substrate. The circle is centered on the center of a rotational shaft of the substrate. The substrate includes a first opening and a plurality of second openings, and the plurality of second openings extend radially with respect to the center of the rotational shaft.

Abstract: The projection image display apparatus of the disclosure includes a light source, a projection optical system that projects light entering an incident port, an optical modulator element, and wavelength selection filter. The optical modulator element includes multiple mirrors on its base. These mirrors are driven to switch, based on an image signal, between the ON state for reflecting a light entering from a light source toward the incident port of the projection optical system and the OFF state for reflecting a light entering from the light source in a direction other than the incident port of the projection optical system. In light entering from the light source to irradiate the optical modulator element, the wavelength selection filter reflects a light wavelength component that will be planar reflection light after being reflected on the base and entering the incident port of the projection lens.

Abstract: A light source device and a projection type display apparatus include: an excitation light source; and a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to the excitation light source and a reflection section containing titanium oxide located on the opposite side of the excitation light source as viewed from the side of the fluorescence light-emitting section and arranged such as to be joined to the fluorescence light-emitting section. Then, excitation light from the excitation light source is projected onto the fluorescence light-emitting section so that fluorescence emission light is emitted from the fluorescence light-emitting section and reflected fluorescence light is emitted from the reflection section.

Abstract: A light source device and a projection type display apparatus include: an excitation light source; and a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to the excitation light source and a reflection section containing titanium oxide located on the opposite side of the excitation light source as viewed from the side of the fluorescence light-emitting section and arranged such as to be joined to the fluorescence light-emitting section. Then, excitation light from the excitation light source is projected onto the fluorescence light-emitting section so that fluorescence emission light is emitted from the fluorescence light-emitting section and reflected fluorescence light is emitted from the reflection section.