Information recording apparatus, information recording medium and information recording medium
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United States of America Patent
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Jun 2, 2009
Grant Date -
Oct 12, 2006
app pub date -
Aug 24, 2005
filing date -
Mar 22, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To achieve stable, high capacity, high speed recording. Of two light beams emitted from a light irradiation means, one or two beams are made pass through an optical path changeable member whereof at least one of the thickness and refractive index changes continuously or in two or more steps immediately after emission from the light irradiation means, so that a difference is introduced into the optical path length of the two beams, and the focusing point of one beam is made to vary to coincide with a position in the recording layer used for playback or recording. Another light beam is used for servo. Converging of light during recording or read of a multilayer recording medium is performed with higher precision than in the prior art, so higher density, higher capacity recording/playback can be performed.
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