| 摘要 |
<P>PROBLEM TO BE SOLVED: To position a grating lens simply and exactly when mounting or replacing it onto a base in a light source unit of an optical system. <P>SOLUTION: A circumferential edge of one end face of the grating lens 20 is formed to have a tapered face 20b, an insertion-engagement part 10a for holding the grating lens 20 in the direction of thickness is provided on the base, and the grating lens 20 is fitted into the insertion engagement part 10a, so that thereby the optical axes of the grating lens 20, a light-emitting diode 1, and a through-path of the light are aligned with each other. At the same time, a cover member 30 for pressurizing the grating lens 20 fitted into the insertion-engagement part 10a in the direction of insertion-engagement is arranged on a base 10 so as to be freely detachable, and the cover member 30 is provided with an adjustment hole 30a for rotation adjustment of the grating lens 20. <P>COPYRIGHT: (C)2007,JPO&INPIT |
