Objective lens and optical head for optical disc drive
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United States of America Patent
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Nov 26, 2002
Grant Date -
Nov 29, 2001
app pub date -
Feb 28, 2001
filing date -
Apr 21, 2000
priority date (Note) -
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Abstract
An optical head for an optical disc drive is provided with a first laser diode that emits a shorter wavelength laser beam, a second laser diode that emits a longer wavelength laser beam, and an objective lens for converging the beams emitted by the laser diodes on the data recording surface of the optical disc. Each of first and second surfaces of the objective lens is rotationally symmetrical, and a rotational axis of the first surface and a rotational axis of the second surface are arranged to be deviated from each other.
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