Optical recording apparatus and optical recording/reproducing apparatus
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United States of America Patent
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Jun 20, 2006
Grant Date -
Sep 30, 2004
app pub date -
Sep 12, 2003
filing date -
Mar 24, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical recording/reproducing apparatus having excellent resistance against vibration and noise is provided. In recording, coherent light is polarization-modulated with a spatial light modulator to generate signal light and reference light whose polarization directions are crossed at right angles with each other. The signal light permeates a polarizing beam splitter, and is incident to a quarter wavelength plate. The reference light passes through a passing hole, is diffused by a light diffuser and is incident to the quarter wavelength plate. The reference and signal light are converted into circularly polarized light which revolve in directions opposite to each other and condensed by a condenser lens, and then a predetermined area of an optical recording medium is irradiated with the reference and signal light. Thus, the reference and signal light are generated by modulating the incident light from the same light source and are coaxially incident to the polarizing beam splitter.
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