Optical pickup device
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United States of America Patent
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-
Sep 1, 2015
Grant Date -
Dec 18, 2014
app pub date -
Jun 13, 2014
filing date -
Jun 18, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An optical pickup device includes a light source configured to output laser light, an objective lens configured to converge the laser light emitted from the light source onto an optical disc, a sensor lens including a lens surface on which return light reflected by the optical disc is incident and that is also configured to generate an astigmatism in the return light, and a light-receiving element configured to receive the return light which has passed through the sensor lens 40 and to generate a focus error signal based on the received return light. The lens surface includes a first curvature radius in a first direction and a second curvature radius different from the first curvature radius in a second direction that is perpendicular or substantially perpendicular to the first direction.
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