Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-10-05
2010-12-07
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112050
Reexamination Certificate
active
07848208
ABSTRACT:
An optical head device is provided with a semiconductor laser, an aberration correcting element for transmitting a beam from the semiconductor laser, a light guiding portion for introducing the beam from the semiconductor laser to the aberration correcting element, and an objective lens for focusing the beam having passed through the aberration correcting element on an optical disc. The aberration correcting element corrects a longitudinal chromatic aberration occurring in the objective lens and a longitudinal chromatic aberration occurring in the light guiding portion excluding the objective lens and the aberration correcting element based on a longitudinal chromatic aberration occurring in the aberration correcting element when the semiconductor laser emits a beam having a wavelength different by a specified wavelength difference.Therefore, an optical head device, an aberration correction method and an optical information processing apparatus can be provided which can suppress a longitudinal chromatic aberration occurring in the entire optical system from a light source to an objective lens.
REFERENCES:
patent: 2005/0105436 (2005-05-01), Tsai
patent: 2005/0157623 (2005-07-01), Itonaga
patent: 2001-108894 (2001-04-01), None
patent: 2001-256672 (2001-09-01), None
patent: 2002-82280 (2002-03-01), None
Aikoh Hideki
Anzai Joji
Mori Eishin
Sano Kousei
Feild Joseph H
Goma Tawfik
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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