Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
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United States of America Patent
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Mar 22, 1994
Grant Date -
N/A
app pub date -
Nov 29, 1991
filing date -
Nov 30, 1990
priority date (Note) -
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Abstract
In the magneto-optic recording/reproduction apparatus, a light beam from a semiconductor laser that can be used with two wavelengths, for recording and reproduction is converged by an objective lens on a magneto-optic disk, a predetermined offset is added to this focusing error signal by an offset adjusting circuit, and the objective lens is driven in the direction of the optical axis based on the focusing error signal to which an offset was added.
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