Patent ID: 6373809
Filing Date: 2002-04-16
Classification: G11B

Abstract:
An optical head for recording and reading data on an optical recording medium comprising:a first light source for generating a plurality of data modulated write beams, said write beams being at a higher power level to record said data on said optical recording medium, a second light source for generating a plurality of read beams, said read beams being at a lower power level to read said data on said optical recording medium, a first broadband non-polarizing beam splitter for directing said write beams or said read beams to a first detector for power detection or to said optical recording medium, a second broadband non-polarizing beam splitter for directing said write beams or said read beams to said optical recording medium and to direct said read beams retroreflected from said recording medium, and a beam splitter for splitting said retroreflected read beams from said second broadband non-polarizing beam splitter and directing said split beams to a second detector for focusing said read beams on said optical recording medium and a third detector for reading said data from said optical recording medium and for tracking said data from said optical recording medium.