| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a light source device and a projector realizing the improvement of the light utilization efficiency of a light beam radiated from a light emitting portion. <P>SOLUTION: In the light source device 10, relations ofθ1≤Tan<SP>-1</SP>(Hd/(2f1)) and T1<H≤Hd are established, where a diameter of an almost circle defining an edge on the neck 121 side of a usable-light reflection area in a reflecting portion 122 of a main reflecting mirror 12 is Hd, a distance between the edge on the neck 121 side of the usable-light reflection area of the reflecting portion 122 of the main reflecting mirror 12 and an emitting center O of the emitting portion 1111 in a central axis direction of the light beam irradiated from the light source device 10 is f1, an opening diameter on a base end side in an extending direction of the neck 121 is H, a diameter of sealing portion 1112, 1113 is T1, and an angle formed by lines connecting inflection points IP1 between the emitting portion 1111 and the sealing portion 1112 with the emitting center of the emitting portion 1111 and the central axis of the light beam radiated from the light source device 10 isθ1. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
