Method and apparatus for reading or measuring magneto-optical storage media using pinhole aperture
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United States of America Patent
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-
Jul 11, 1989
Grant Date -
N/A
app pub date -
Jun 19, 1987
filing date -
Jun 19, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A scanning confocal optical imaging system is utilized to read or measure data magnetically recorded on a magneto-optic disk. The system includes a laser for producing a linearly polarized beam and a beam splitter for directing the transmitted beam to the disk and for deflecting a portion of the reflected return beam from the disk to a photodetector. A pinhole plate is placed between the beam splitter and the disk for restricting the size of the transmitted and reflected beams, and a polarizer is positioned between the beam splitter and the photodetector to receive the deflected return beam and provide an output that discriminates between the differing directions of rotation of the polarization plane of the transmitted beam by the magnetized area on the disk so that the direction of magnetization of the magnetized area can be read by the photodetector.
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