Aberration correcting apparatus

Details Aberration correcting apparatus Aberration correcting apparatus

2007-01-30

2007-01-30

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053330

Reexamination Certificate

active

10050604

ABSTRACT:
An aberration correcting element includes a first aberration correction element movable along the optical axis of the light beam for correcting the aberration of the light beam; a driver for positioning the first aberration correction element along the optical axis in response to a drive control signal; a second aberration correction element having a plurality of phase adjustment portions each generating an amount of phase change in the light beam, the amount corresponding to an adjustment signal; a phase adjuster for supplying the adjustment signal to the respective adjustment portions in response to a phase control signal; a light receiver for receiving the light beam reflected from the recording medium to generate a light-receiving signal; and a controller for generating the drive control signal and the phase control signal based on the light-receiving signal.

REFERENCES:
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patent: 6552984 (2003-04-01), Yamazaki et al.
patent: 6885616 (2005-04-01), Kikuchi et al.
patent: 2001/0021162 (2001-09-01), Kikuchi et al.

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