Method and apparatus for calibrating an optical disk system

Details Method and apparatus for calibrating an optical disk system Method and apparatus for calibrating an optical disk system

1988-06-09

1990-03-06

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 53, 369 54, 369 55, 369 58, G11B 700

Patent

active

049072129

ABSTRACT:
Calibration of read timing, write timing and focus is accomplished automatically by comparing reflectance signals. The timing or focus settings are preferably modified, and signals are again compared under the modified adjustment settings. The read timing adjustment includes comparing signals from mark positions immediately preceding and immediately following an isolated mark and adjusting read delay to achieve small or minimum differences between the signals at the mark positions immediately preceding and immediately following the isolated mark bit position. Focus calibration is accomplished by comparing the value of the signal from a mark with the value from a mark position immediately adjacent the mark and adjusting the focus offset until a larger maximum difference between the two signals is achieved. The write timing calibration is preferably achieved by causing the write circuitry to emit a low-power light beam in the vicinity of an unwritten mark position and adjusting the write timing delay circuitry until a low or minimum signal, i.e. high reflectance, is achieved at a desired mark position.

REFERENCES:
patent: 4571712 (1986-02-01), Romano et al.
patent: 4571714 (1986-02-01), Mathews et al.
patent: 4577301 (1986-03-01), Mathews et al.
patent: 4621351 (1986-11-01), Baer et al.
patent: 4832487 (1989-05-01), Mikuriya et al.

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