| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plastic lens and an optical pickup device, to which marking for easily discriminating two or more pieces of information is applied. <P>SOLUTION: The plastic lens 1 has a flange part 2 on the outer circumference of an optical function part for making a light pass through, and has a circular marking 3b whose shape as viewed from the flange surface 21 of the flange part 2 is circular and an oval marking 3a whose shape seen therefrom is oval on the flange surface 21, at least on one surface side of the flange part 2. <P>COPYRIGHT: (C)2007,JPO&INPIT |
