Abstract
A flying type optical head on an air bearing slider is proposed for phase-change recording media. Data signals are detected as light output switched by the light reflected back from the medium. The head consists of a beam-converging laser diode and a photodetector. The full widths at the half-maximum of the near field pattern of the laser diode are 0.8 μm and 1 μm. This paper clarifies the head signal detection mechanism. Signal amplitude variation due to the flying height change is reduced to less than 30% and signal-to-noise ratio is sufficiently increased by decreasing the reflectivity of the laser facet facing the medium to less than 5%. Furthermore, OSL head track error signal using the sampled servo method is successfully detected.
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