Light source device and projection-type display apparatus

[0048]FIG. 1 is a view showing a configuration of a projection-type display apparatus including a light source device according to Embodiment 1 of the present invention. As shown in FIG. 1, the projection-type display apparatus 7a according to Embodiment 1 include a light source device 1, a condenser lens 4, a light intensity equalizing element 5, a relay lens group (i.e., a relay optical system) 6, an image display element (i.e., a light valve) 3, and a projection optical system 8. The light source device 1 emits a light flux. The condenser lens 4 condenses the light flux emitted by the light source device 1. The light intensity equalizing element 5 equalizes an intensity distribution of the light flux condensed by the condenser lens 4. The relay lens group (i.e., the relay optical system) 6 guides the light flux whose intensity is equalized by the light intensity equalizing element 5 to the image display element 3. The image display element (i.e., the light valve) 3 modulates the lig

[0085]Embodiment 2 is different from Embodiment 1 in arrangement of the light sources of a first light source group 20a and a second light source group 20b and arrangement of transmitting portions and reflecting portions of a transmitting-reflecting element 27. In this Embodiment 2, the components on the emission side of the light source device are the same as the components described in Embodiment 1. The components on the emission side of the light source device are components from the condenser lens 4 to the screen 9 shown in FIG. 1. That is, the components on the emission side of the light source device are the condenser lens 4, the light intensity equalizing element 5, the relay lens group 6, the image display element 3, the projection optical system 8 and the screen 9.

[0086]FIG. 4 is a view showing positions of respective light sources 21r, 21b, 21g, 22r, 22b and 22g so as to be superimposed on regions of the transmitting-reflecting element 27 irradiated with the respective parall

[0111]FIG. 7 is a configuration view showing a configuration of a projection-type display apparatus 7b including a light source device according to Embodiment 3 of the present invention. The light source device according to this Embodiment 3 includes two light source units 101a and 101b, and is configured to combine light fluxes emitted by the two light source units 101a and 101b using a polarization separation element 68. Here, the “light source unit” itself may constitute the light source device 1 as in Embodiment. When a plurality of light source devices are provided for increasing an amount of light, each of the light source devices may be referred to as the light source unit. That is, in Embodiment 3, the light source device 1 described in Embodiment 1 or 2 is described as the light source units 101a and 101b. In the projection-type display apparatus 7b, components on the emission side of the light source device are the same as those of Embodiment 1. The components on the emission