Tracking control apparatus and optical pickup having the same

Details Tracking control apparatus and optical pickup having the same Tracking control apparatus and optical pickup having the same

1995-04-27

1996-09-24

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, G11B 709

Patent

active

055597718

ABSTRACT:
A tracking control apparatus comprises a laser source having a plurality of laser emitting devices each of which can be operated selectively. A beam emitted from the laser source is reflected from disk, and then the beam is received by a photodetector. A tracking error is detected on the basis of an image of the beam received by the photodetector, and a tracking error signal is generated by a tracking error signal generating device. In response to this tracking error signal, an actuating device selectively actuates only light emitting devices located at a position compensatory for the tracking error among the laser emitting devices. Thus, in controlling tracking with the laser source having a plurality of laser emitting devices, the sensitivity to the frequency is maintained excellently even to a multiple GHz frequency, thereby providing correct tracking control.

REFERENCES:
patent: 4761773 (1988-08-01), Okada et al.

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