Diffractive Element for Optical Pickup and Optical Module Including the Same
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United States of America Patent
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Issued Date -
Sep 15, 2011
app pub date -
Apr 7, 2010
filing date -
Mar 11, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided are a diffractive element for optical pickup and an optical module including the diffractive element. The diffractive element includes a plurality of diffraction patterns, and the diffraction patterns include a main diffraction pattern for creating diffraction characteristics, and an alignment mark pattern for recognizing an alignment position, the alignment mark pattern having a different pitch from the main diffraction pattern. Also, the pitch of the alignment mark pattern is formed smaller than that of the main diffraction pattern. Further, a ratio of the pitch of the alignment mark pattern to that of the main diffraction pattern is ⅛ or greater to ½ or less.
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