Patent ID: 7336587

Claim:
An optical pickup head compatible with multiple optical recording media, comprising: a first light source for emitting a first light beam with a first wavelength; a second light source for emitting a second light beam with a second wavelength; a third light source for emitting a third light beam with a third wavelength; a prism unit disposed beside the first, second and third light sources, the prism unit including a first portion facing the first light source for passing the first light beam therethrough, a second portion facing the second light source for passing the second light beam therethrough, and a third portion facing the third light source for passing the third light beam therethrough; a reflective multi-surface prism disposed beside the prism unit for redirecting light beams by way of internal reflection; a collimating lens disposed beside the reflective multi-surface prism for collimating light beams; and an objective lens adapted to face any of the optical recording media, for receiving light beams and transmitting the light beams to any of the recording media; wherein the prism unit further includes a first aspherical surface for correcting aberrations of the first light beam caused by non-matching between the first light beam and the collimating and objective lenses, and a second aspherical surface for correcting aberrations of the third light beam caused by non-matching between the third light beam and the collimating and objective lenses.