Optical head and optical disk device

Details Optical head and optical disk device Optical head and optical disk device

2005-12-27

2010-11-23

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112070, C369S044230, C369S112050, C369S044240

Reexamination Certificate

active

07839754

ABSTRACT:
An optical head includes a first laser diode configured to generate a laser beam with a wave length of λ1, a second laser diode configured to generate a laser beam with a shorter wave length of λ2than the wave length λ1, a collimator lens arranged so that the laser beams are incident on it, an aperture filter arranged on an optical axis of the collimator lens, and an object lens0arranged on the optical axis so that the laser beams passing through the aperture filter are incident on it, wherein the second laser diode is arranged at a position on the optical axis further away from collimator lens than the first laser diode is away from the collimator lens.

REFERENCES:
patent: 2004/0233821 (2004-11-01), Saitoh et al.
patent: 2005/0122883 (2005-06-01), Kimura
patent: 2005/0226124 (2005-10-01), Kimura et al.
patent: 10-208267 (1998-07-01), None
patent: 11-306581 (1999-05-01), None
patent: 2001-291259 (2001-10-01), None
patent: 2002-197717 (2002-12-01), None

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