Patent ID: 6043912
Filing Date: 2000-03-28
Classification: G02B,G11B

Abstract:
An optical pickup apparatus compatible with first and second types of optical recording media, using first and second light beams having respective different wavelengths for recording and reading information, the optical pickup apparatus comprising:first and second laser light sources to emit the first and second light beams having the different wavelengths, respectively;a holographic lens, including a holographic region, an inner region and an outer region, the inner region transmitting the first and second light beams emitted from the respective first and second light sources, the holographic region diffracting the second light beam emitted from the second light source, and the outer region transmitting the first light beam emitted from the first light source;an objective lens to focus the first and second light beams passed through the holographic lens on respective information recording surfaces of the first and second types of the optical recording media; andoptical elements to alter optical paths of the first and second light beams emitted from the first and second laser light sources, so as to be used in recording and/or reading information on the respective first and second types of optical recording media.