Optical system for optical head
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United States of America Patent
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May 25, 2004
Grant Date -
May 31, 2001
app pub date -
Nov 29, 2000
filing date -
Nov 30, 1999
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Abstract
An optical system for an optical head employed in an optical disc drive, which uses a plurality of kinds of optical discs having different thickness cover layers, is provided with a light source, an objective lens and a light receiving unit. A plurality of diverging light beams having different wavelengths are emitted from a plurality of light emitting points, respectively. One of the light emitting points is used depending on a thickness of a cover layer of a currently loaded optical disc. The objective lens is capable of converging each diverging beam on a data recording surface of the optical disc. The light receiving unit receives a beam reflected by the optical disc and generates electronic signals representing the recorded data. In this optical system, an image magnification M of the objective lens satisfies a condition: -0.144
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Maruyama, Koichi
Tokyo, JP
135
1473
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