Optical pickup and disk drive apparatus

Details Optical pickup and disk drive apparatus Optical pickup and disk drive apparatus

2006-11-07

2006-11-07

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07133350

ABSTRACT:
An optical pickup has a light-emitting device having a first light emitter and a second light emitter which emit a first laser beam and a second laser beam, respectively, a beam splitter plate, a collimator lens which converts the first laser beam and the second laser beam into a parallel beam, and a light-detecting device. The first laser beam has an optical axis aligned with an optical axis of an objective lens, and the second laser beam has an optical axis displaced off the optical axis of the objective lens. The second light emitter is placed in a position where the angle α of incidence of the second laser beam on the beam splitter plate is greater than the angle θ of incidence of the first laser beam on the beam splitter plate, thereby reducing the amount of generated aberrations for increased performance.

REFERENCES:
patent: 6084843 (2000-07-01), Abe et al.
patent: 6671247 (2003-12-01), Arai et al.
patent: 6934239 (2005-08-01), Takeuchi
patent: 2004/0120243 (2004-06-01), Aiki et al.
U.S. Appl. No. 11/230,473, filed Sep. 21, 2005, Aiki.

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