Tilt detection method and optical disk drive

Details Tilt detection method and optical disk drive Tilt detection method and optical disk drive

1998-07-28

2000-10-03

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 54, 369116, G11B 709

Patent

active

061282588

ABSTRACT:
In an optical disk drive using as a light source a semiconductor laser having a main electrode and a plurality of subsidiary electrodes, a wave front of a generated laser beam is modulated by controlling injection currents to the plurality of subsidiary electrodes, in accordance with a change in signal outputs when the wave front is modulated, a tilt is detected between a direction normal to the surface of an optical disk and an objective lens optical axis, and in accordance with the detected tilt, the injection currents to the semiconductor laser are determined to correct the tilt. Since the tilt is detected and corrected through electrical modulation, the system can be made compact without using new components for tilt detection, and high speed control up to a high frequency becomes possible because there is no limit of the control bandwidth to be caused by sub-resonances in a high frequency band, like a mechanical actuator.

REFERENCES:
patent: 5859818 (1999-01-01), Tateishi et al.
patent: 5886496 (1999-03-01), Furukawa et al.
patent: 5914923 (1999-06-01), Araki et al.

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