Patent ID: 6041027
Filing Date: 2000-03-21
Classification: G11B

Abstract:
An optical pickup for use with disks each having a different thickness, comprising:first and second optical modules, said first and second optical modules comprising:first and second light sources, respectively, for generating light each having a different wavelength;first and second detecting means, respectively, for each receiving reflected light from said disks which each have a different thickness, said first and second detecting means for detecting electrical signals;an objective lens for collecting light radiated from said first and second light sources and focusing said light on said disks each having a different thickness;optical path control means for controlling an optical path so that the light radiated from said first and second light sources can be incident on said objective lens; andmeans for adjusting a radiation angle of said first and second light sources using said first and second optical modules to restrict the effective numerical aperture of said objective lens.