Patent ID: 7342851

Claim:
An optical pickup apparatus for recording and/or reproducing information for an optical disk, comprising: a first light source configured to emit a first light flux having a first wavelength for recording and/or reproducing a first optical disk provided with a transparent substrate; a second light source configured to emit a second light flux having a second wavelength shorter than the first wavelength, for recording and/or reproducing a second optical disk provided with a transparent substrate; a third light source configured to emit a third light flux having a third wavelength longer than the first wavelength, for recording and/or reproducing a third optical disk provided with a transparent substrate having a thickness thicker than that of each of the first and second optical disks; and a finite conjugation type optical system configured to converge the first, second, and third light fluxes, each of which is incident to the finite conjugation type optical system as a finite light flux, onto the first, second, and third optical disks respectively, the finite conjugation type optical system comprising an objective lens.