Patent ID: 6404709
Filing Date: 2002-06-11
Classification: G11B

Abstract:
An optical pickup device comprising:a main portion having a first light source to emit a first laser beam, a second light source to emit a second laser beam having a wavelength different from a wavelength of said first laser beam, and a photodetecting portion to receive first and second return light of said first and said second laser beams which are reflected and returned from an optical disc; and an optical axis coupling prism which is fixed to said main portion and has a first plane of incidence where said first laser beam enters, a second plane of incidence where said second laser beam enters, a plane of synthesis to make optical axes of said first and said second laser beams coincident, and a plane of emission to emit said first and said second laser beams which have passed through said plane of synthesis and whose optical axes are made coincident; wherein said optical axis coupling prism has a first light separating device, arranged between said second plane of incidence and said plane of synthesis, for generating two sub laser beams which are deviated from the optical axis of said second laser beam.