Patent ID: 7483359
Filing Date: 2009-01-27
Classification: G11B

Abstract:
1. An optical pickup head for a high density recording and/or reproducing device compatible with at least first and second optical recording media, comprising: a first light source emitting first light beams with a first wavelength; a second light source emitting second light beams with a second wavelength greater than the first wavelength; a prism unit including a first prism facing the first light source adapted to receive the first light beams emitted by the first light source, a second prism facing the second light source adapted to receive the second light beams emitted by the second light source, and an aspherical surface for the second light beams to pass therethrough; a collimating lens located beside the prism unit for collimating incident first and second light beams; and an objective lens for receiving the first and second light beams and transmitting the first and second light beams to the at least first and second optical recording media respectively.