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US 10,049,695 B2Granted
Optical pickup device and optical drive device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMasatoshi Yajima, Kazuyoshi Kajita, Masahiko Nakamura
Life of this patent
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Abstract
An optical pickup device includes a semiconductor laser that emits a laser beam, and an object lens that concentrates the laser beam emitted from the semiconductor laser on an optical disc. In this optical pickup device, an optical axis of the object lens is inclined with respect to an optical axis of the laser beam that is incident on the object lens so as to generate flares caused by coma aberration on an entrance side in a forward direction of pits of the optical disc.
Claims6
An optical pickup device comprising:
- a semiconductor laser that emits a laser beam;
- and
- an object lens that concentrates the laser beam on an optical disc,
- wherein an optical axis of the object lens is inclined with respect to an optical axis of the laser beam that is incident on the object lens so as to generate a flare caused by coma aberration on an entrance side in a forward direction of pits of the optical disc.
1 more element
Dependencies are inferred from the claim text.