Patent ID: 7671312

Claim:
An optical pickup system comprising: a first light source emitting a light flux with a first wavelength; a second light source emitting a light flux with a second wavelength which is different from the first wavelength; and a light-converging optical system converging the light flux with the first wavelength from the first light source with a first magnification onto a first reference surface set at a first depth from a surface of an optical information recording medium, and converging the light flux with the second wavelength from the second light source with a second magnification onto a second reference surface set at a second depth, which is different from the first depth, in the optical information recording medium where the first reference surface is formed, wherein the first and second wavelengths, the first and second depths, and the first and second magnifications satisfy: a first condition that an aberration generated when the light flux from the first light source is converged onto the first reference surface is substantially a same to an aberration generated when the light flux from the second light source converged onto the second reference surface; and a second condition that a working distance of the light-converging optical system converging the light flux from the first light source onto the first reference surface is substantially a same to a working distance of the light-converging optical system converging the light flux from the second light source onto the second reference surface.