Optical pickup device
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United States of America Patent
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Mar 19, 2013
Grant Date -
Jan 3, 2013
app pub date -
Jun 29, 2012
filing date -
Jun 29, 2011
priority date (Note) -
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Abstract
An astigmatism element converges laser light in a first direction for generating a first focal line, and converges the laser light in a second direction perpendicular to the first direction for generating a second focal line. A light separating element guides the laser light entered into two first areas and into two second areas to four positions different from each other. The light separating element imparts a light separating function to the laser light entered into the first two areas in directions identical to each other and with magnitudes different from each other, and imparts a light separating function to the laser light entered into the two second areas in directions identical to each other and with magnitudes different from each other.
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