Patent ID: 7358470
Filing Date: 2008-04-15
Classification: G11B

Abstract:
1. An optical pickup, comprising: a laser diode for emitting a plurality of first linear polarized laser lights; a photo detector integrated circuit for receiving and detecting the signal strength of a reflected light reflected from a recording media; and an optical element set comprising a grating, a reflective coating device, and an objective lens; wherein said optical element set is placed between said laser diode and said photo detector integrated circuit so that said reflective coating device reflects said first linear polarized laser lights into first circular or oval polarized lights to focus on said recording media, said recording media reflects said first circular or oval polarized lights into second circular or oval polarized lights back to said reflective coating device, and said reflective coating device passes a part of said second circular or oval polarized lights to said photo detector integrated circuit and reflects a part of said second circular or oval polarized lights into second linear polarized lights to said laser diode, said first and second linear polarized lights having a 90° angle of polarization orientation change caused by said reflective coating device.