Optical disk data recording and reproduction with opposed polarity in adjacent tracks

摘要

An information recording apparatus includes a laser source emitting a laser beam for reproducing or recording data pits on a recording medium; an objective lens; a photodetector; an analog signal processing means performing amplification and waveform shaping for an electric signal output from the photodetector; a land/groove detecting means and outputting a polarity switch instruction signal; a reproduction signal polarity switch means for changing the signal polarity at reproduction in response to the polarity switch instruction signal from the land/groove detecting means; a controller for controlling the information recording apparatus at the request of a host computer performing control and process as a whole; a recording pulse modulating means for modulating a recording pulse on the instruction from the controller; a polarity switch means for changing the polarity of an output from the recording pulse modulating means; a recording signal polarity switch means for changing the signal polarity at recording in response to the polarity switch instruction signal from the land/groove detecting means by selecting one of an output from the polarity switch means and an output from the recording pulse modulating means, and outputting a recording data signal; and a laser driving means for controlling the laser source in response to the recording data signal from the recording signal polarity switch means, whereby the recording polarity of the data pits is switch between adjacent tracks on the recording medium, resulting in recording and reproduction of signals which are hardly affected by crosstalk between the adjacent tracks.