Optical recording device and aberration correction method

Details Optical recording device and aberration correction method Optical recording device and aberration correction method

2004-10-27

2008-10-14

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S044330

Reexamination Certificate

active

07436742

ABSTRACT:
An optical recording device includes an optical pickup, an asymmetry detection circuit, and a microcomputer. The optical pickup corrects an aberration of an object lens based on an aberration correction value using a liquid crystal panel in the optical pickup, irradiates a laser beam of multiple stages of recording powers on an optical disk to form marks, and then reproduces the formed marks with a reproduction power. The asymmetry detection circuit detects amplitudes of RF signals of the marks reproduced by the optical pickup, calculates amplitude central values such that asymmetry takes a predetermined value, and determines an optimum recording power. The microcomputer performs spherical aberration correction to change a spherical aberration correction value from an initial value such that the optimum recording power takes a minimum value.

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Shinichi Nagahara et al., “Development of the optical pickup of DVD-R/RW (5) drives”, Pioneer R&D, Mar. 31, 2003, pp. 40-55, vol. 13. (Partial translation attached).

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