Aberration correction apparatus, and control apparatus,...

Details Aberration correction apparatus, and control apparatus,... Aberration correction apparatus, and control apparatus,...

2005-03-09

2009-06-02

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

C369S053200, C369S112010, C369S044230

Reexamination Certificate

active

07542397

ABSTRACT:
An aberration correction apparatus includes an optical pickup having a liquid crystal panel for correcting an aberration of a light beam emitted from a light source and irradiated on a recording medium and a control unit which applies, to the liquid crystal panel, a bias voltage in order to correct the aberration. The bias voltage is a voltage at which a diffraction generated in the light beam passing through an electrode gap portion between electrode portions of the liquid crystal panel is minimum. For instance, the bias voltage is the voltage at which a phase difference between the light beam passing through the electrode portions of the liquid crystal panel and the light beam passing through the electrode gap portion is an integral multiple of a wavelength of the light beam. It is thereby possible to prevent unnecessary diffracted light from being generated by the liquid crystal panel for correcting the aberrations.

REFERENCES:
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patent: 6625102 (2003-09-01), Hashimoto
patent: 6628589 (2003-09-01), Iwasaki et al.
patent: 7054253 (2006-05-01), Nomura et al.
patent: 7110343 (2006-09-01), Ogasawara
patent: 7123565 (2006-10-01), Ariyoshi et al.
patent: 2004/0202075 (2004-10-01), Ohguri
patent: 10-289465 (1998-10-01), None
patent: 2001-273663 (2001-10-01), None

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