Patent ID: 6816449
Filing Date: 2004-11-09
Classification: G02B,G11B

Abstract:
An optical pickup apparatus compatible with different types of optical recoding media, using first and second light beams having respectively different wavelength to record and/or reproduce information to and/or from the different types of optical recording media, the optical pickup apparatus comprising:first and second light sources to emit the first and second light beams having the respectively different wavelengths based upon a received one of the different types of the optical recoding media; an objective lens to focus the corresponding one of the first and second light beams on the received one of the different types of the optical recoding media comprising an inner region to transmit the first and second light beams, a holographic region to diffract the second light beam, the holographic region comprising a plurality of concentric ring-shaped steps on a lens surface of said objective lens, and an outer region to transmit the first light beam; a photodetector to detect the light reflected from the received one of the different types of the optical recoding media; and a beam splitter to transmit the first and second light received from said first and second light sources to said objective lens, and the light reflected from the received one of the different types of the optical recoding media to said photodetector.