| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source capable of preventing a light guide rod from shifting in an optical axis direction.SOLUTION: In the light source device 10 in which a light source 5B is arranged at a first focal point F1 of an elliptical reflection mirror 5A, a columnar light guide rod 6 for uniformalizing the luminous flux incident from one end side 6in and emitting it from the other end side 6out is arranged on an optical axis K of the elliptical reflection mirror 5A, and the one end side 6in of the light guide rod 6 is arranged at a second focal point F2 of the elliptical reflection mirror 5A, a regulation member which is locked at a locking part 40 arranged on an outer circumferential face 6A of the light guide rod 6 and regulates shifting in the optical axis K direction is further provided, and the locking part 40 of the light guide rod 6 is provided, out of the outer circumferential face 6A between the one end side 6in and the other end side 6out, at a site A1 where the luminous flux incident from the one end side 6in reaches the inner face, and/or, at a site retaining an area where the luminous flux repeats inner reflections at least more than twice before reaching the other end side 6out. |
