| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device that can prevent the lowering of the rim intensity of a laser spot generated in a signal recording layer of an optical disk by the light collection operation of an objective lens. <P>SOLUTION: A reflection preventing film 11 for adjusting the intensity of a laser beam passing through an objective lens is provided on the surface of the objective lens 10. When a transmittance between a first numerical aperture (B) (provided that (B) is a positive number smaller than (A)) and the maximum numerical aperture (A) of the objective lens 10 is assumed to be 100% by the reflection preventing film 11, a transmittance in a numerical aperture of a second numerical aperture (C) (provided that (C) is a positive number smaller than (B)) is set to be R% (provided that (R) is a positive number smaller than 100) or less. This prevents the lowering of the rim intensity of the laser spot generated when the signal recording layer is irradiated with the laser beam. <P>COPYRIGHT: (C)2012,JPO&INPIT |
