Velocity control for a disk drive actuator

G - Physics – 11 – B

Patent

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Details

G11B 21/02 (2006.01) G11B 21/08 (2006.01)

Patent

CA 2230153

A data storage device (20) for reading and writing information to and from a storage medium (62, 60) and having an actuator (32) for moving a read/write head (36) over a surface of the storage medium comprises an optical sensor (54) mounted on either a surface of the data storage device (20) or a surface of the actuator (32), and a gray-scale pattern (52) provided on the other of these surfaces, opposite the optical sensor (54). The gray-scale pattern (52) provides an amount of reflected light at the optical sensor (54) that varies with the position of the actuator (32). The optical sensor (54) receives the reflected light and generates therefrom an output signal indicative of the position of the actuator (32). A control system (82) processes the position signal output from the optical sensor (54) for controlling the velocity of the actuator (32).

Un dispositif (20) de stockage de données, qui permet de lire des informations provenant d'un support de stockage (62, 60) et de les y écrire, comprend un actuateur (32), qui déplace une tête de lecture/écriture (36) sur une surface de ce support, ainsi qu'un capteur optique (54) monté sur une surface du dispositif (20) de stockage de données ou de l'actuateur (32), et une échelle des gris (52) disposée sur l'autre surface, en face du capteur optique (54). Cette échelle des gris (52) fournit audit capteur (54) une quantité de lumière réfléchie variant selon la position de l'actuateur (32). Le capteur optique (54) reçoit cette lumière réfléchie et délivre, selon celle-ci, un signal de sortie indiquant la position de l'actuateur (32). Un système de commande (82) traite ce signal de sortie de position provenant du capteur optique (54) pour commander la vitesse de l'actuateur (32).

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