| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an object lens which has a high numerical aperture and also has a small flexure on a lens surface or aberration. <P>SOLUTION: There is provided the object lens for an optical disk. The object lens for an optical disk includes an aspherical lens surface facing a light source, wherein an aspherical equation which is applied to form the aspherical lens surface includes two quadratic functional terms. Accordingly, there is provided the lens which has a high numerical aperture and also has the small flexure on the lens surface or aberration. <P>COPYRIGHT: (C)2011,JPO&INPIT |
