Focus capture method for magneto-optic disk drives

Details Focus capture method for magneto-optic disk drives Focus capture method for magneto-optic disk drives

1989-09-25

1992-05-12

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 54, G11B 795

Patent

active

051133849

ABSTRACT:
A method for obtaining focus capture in an optical disk drive having a focus servo system with a servo loop and operable in open and closed loop modes, including: opening the servo loop and operating the servo system in the open-loop mode; scanning an objective lens about a focus axis with respect to an optical disk at a calibration velocity; peak detecting focus error signals produced while the lens is scanned at the calibration velocity to determine a peak focus error signal value; storing a calibration threshold value as a function of the peak focus error signal value; scanning the objective lens about the focus axis at a focus capture velocity; comparing the focus error signal values produced while the lens is scanned at the focus capture velocity to the calibration threshold value; and closing the servo loop and operating the focus servo system in the closed-loop mode when the focus error signal values reach the calibration threshold value.

REFERENCES:
patent: 4700056 (1987-10-01), Silvy et al.
patent: 4998233 (1991-03-01), DiMatteo et al.

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