Patent ID: 6584061
Filing Date: 2003-06-24
Classification: G11B

Abstract:
An optical pick-up device comprising:a first semiconductor laser for emitting a first laser beam; a second semiconductor laser for emitting a second laser beam having a different wavelength from that of the first laser beam; an objective lens for causing the first and second laser beams to converge as light spots on an optical recording medium; a common light receiving element for receiving a return light sent from the optical recording medium, and first and second beam splitters, the first laser beam being guided to the objective lens through the first and second beam splitters, the second laser beam being guided to the objective lens through the second beam splitter and the return light being guided to the common light receiving element through the first and second beam splitters, wherein the first beam splitter has a reflectance set within approximately 70% to 90% for the first laser beam and is set to a full transmittance for the second laser beam, and wherein the second beam splitter is set to a full transmittance for the first laser beam and has a reflectanceset within approximately 20% to 60% for the second laser beam.