| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an optical unit for optical head for easily performing mutual accurate positioning of each optical unit which is requested for a interchangeable type optical unit for optical head constituted of three optical elements, with accuracy higher than parts accuracy. <P>SOLUTION: This optical units has three optical elements of a first optical element, a second optical element, and a third optical element in this order from a light source side, and out of three optical elements, a frame part is formed at a part other than an optical effective plane of an optical element formed of at least one resin material, wherein the frame part has a gap formed so that the other optical element can be slid in the orthogonal direction to an optical axis. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
