Apparatus and method to write/reproduce data to/from optical...

Details Apparatus and method to write/reproduce data to/from optical... Apparatus and method to write/reproduce data to/from optical...

2011-05-24

2011-05-24

Giesy, Adam R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053340, C369S053280

Reexamination Certificate

active

07948847

ABSTRACT:
An apparatus and method to write/reproduce data to/from an optical disc, which are capable of preventing an error from occurring at the time of examination of a writing strategy and searching for an optimum writing condition for a short period of time, by examining the writing strategy after adjusting a focus in a test region, in order to set a writing condition at the time of writing data. The apparatus to write/reproduce data to/from an optical disc includes a matrix jitter measuring unit which measures length errors and jitters of edges of a mark and a space of a written data pattern from an RF signal generated at the time of reproduction of the optical disc; and a CPU which extracts at least one of the RF signal, a jitter and an error rate, controls a focus bias, and performs an optimum power calibration (OPC) for searching for optimum power of laser.

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