Patent ID: 7466643

Claim:
An optical pickup system for accessing three different 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 composite prism comprising a first prism facing the first and second light sources, a second prism facing the third light source, and a third prism for receiving the first, second and third light beams from the first and second prisms, wherein the first prism has a surface facing the first and second light sources, the surface defines first and second regions, and the second region has an aspherical surface to compensate aberration of the second light beams; a collimating lens disposed in a common optical path for collimating and transmitting the first, second and third light beams from the composite prism; and an objective lens disposed in a common optical path for focusing the first, second and third light beams from the wavelength selector on the three different types of optical recording media.