| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens for an optical disk that does not deteriorate transferability of a shape and can be prevented from coming into direct contact with an optical disk owing to disturbance such as vibration. <P>SOLUTION: The lens for optical disk has a first surface which is an optical function surface formed on a light source side, a second surface which is an optical function surface formed on an optical disk side, and flange portions formed at peripheries of the optical function surfaces, the flange portion on both the first surface side having at least two surfaces perpendicular to an optical axis. <P>COPYRIGHT: (C)2008,JPO&INPIT |
