Patent ID: 7436751
Filing Date: 2008-10-14
Classification: G11B

Abstract:
1. An optical pickup head for a high density recording and/or reproducing device compatible with three types of 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 third light source emitting third light beams with a third wavelength greater than the second wavelength; a prism unit including a first portion facing the first light source adapted to receive the first light beams emitted by the first light source, a second portion facing the second light source adapted to receive the second light beams emitted by the second light source, and a third portion facing the third light source adapted to receive the third light beams emitted by the third light source; a collimating lens located beside the prism unit for collimating incident first, second and third light beams; and an objective lens for receiving the first, second and third light beams, and transmitting the first, second and third light beams to the first, second and third optical recording media respectively; wherein, the prism unit further includes a first aberration-correcting portion for the second light beams to pass therethrough, and a second aberration-correcting portion for the third light beams to pass therethrough.