| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective lens, an optical pickup apparatus, and a coupling lens which are used for reproducing and/or recording information for at least three kinds of optical disks including a high density optical disk and in which a problem is not caused in a tracking property. <P>SOLUTION: The objective lens is the objective lens for optical pickup apparatus performing reproducing and/or recording of information for first to third optical disks using respective luminous flux of wavelength λ1 to λ3, respective luminous flux of wavelength λ1, λ2 and λ3 are made incident on the objective lens, optical magnification m1 of the objective lens for the luminous flux of wavelength λ1 satisfies 0<m1≤1/10. <P>COPYRIGHT: (C)2008,JPO&INPIT |
