Reading device and reading method for an optical data...

G - Physics – 11 – B

Patent

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G11B 7/005 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2652519

A reading devices suppresses deterioration of the recording marks caused by increasing the output laser power to compensate for a drop in the S/N ratio when reading at a high speed information recorded to a high density recording medium. To read information recorded to an optical data recording medium that is written and read using a laser beam output from a semiconductor laser, the reading method modulates a high frequency current on the drive current of the semiconductor laser to output the laser beam, and changes the light modulation rate according to the selected linear velocity used for reading. The light modulation rate is the ratio Pp/Pave between the peak power Pp and the average read power Pave of the light intensity of the high frequency modulated laser beam.

Dispositif de lecture qui supprime la détérioration des marques d'enregistrement venant de l'augmentation de la puissance de sortie du laser pour compenser une chute du rapport signal sur bruit (S/N) lors de la lecture à haute vitesse d'informations enregistrées sur un support d'enregistrement haute densité. Pour lire les informations enregistrées sur un support d'enregistrement optique de données qui sont écrites et lues en utilisant la sortie d'un faisceau laser d'un laser à semi-conducteur, le procédé de lecture module un courant haute fréquence sur le courant de régulation du laser à semi-conducteur pour produire le faisceau laser, et modifie le taux de modulation de la lumière en fonction de la vitesse linéaire choisie pour la lecture. Le taux de modulation de la lumière est le rapport Pp/Pave entre la puissance maximum, Pp, et la puissance moyenne lue, Pave, de l'intensité de la lumière du faisceau laser modulé à haute fréquence.

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