Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2005-01-18

2005-01-18

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

06845078

ABSTRACT:
An optical pickup apparatus comprises a first light source for emitting a first laser beam having a first wavelength; a second light source for emitting a second laser beam having a second wavelength; and an objective lens for condensing the first laser beam and the second laser beam. The first light source and the second light source are disposed in positions in such a way that a total amount of coma aberration, which is generated on the first laser beam in accordance with a distance between the first light source and an optical axis of a whole optical system and coma aberration, which is generated on the first laser beam in accordance with a tilting amount of the objective lens becomes null, and a total amount of coma aberration, which is generated on the second laser beam in accordance with a distance between the second light source and said optical axis and coma aberration, which is generated on the second laser beam in accordance with the tilting amount of the objective lens becomes null.

REFERENCES:
patent: 6304526 (2001-10-01), Nagashima et al.
patent: 6496453 (2002-12-01), Asada et al.
patent: 6590717 (2003-07-01), Sasano et al.

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