Offset compensation apparatus for tracking error signal of optic

Details Offset compensation apparatus for tracking error signal of optic Offset compensation apparatus for tracking error signal of optic

1994-06-13

1996-09-03

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 54, G11B 709

Patent

active

055530400

ABSTRACT:
An offset compensation apparatus for a tracking error signal in an optical recording reproduction apparatus adds or subtracts a signal, which is proportional to the intensity of a read head laser beam, to or from a tracking error signal (which indicates the difference between a track of an optical disk and a a read head laser beam spot on the optical disk) so as to cancel offsets occur in the tracking error signal that are in proportion to the intensity of the read head laser beam and, thus, compensates for the offset in the tracking error signal. Since the offset compensation signal is also indicative of the amount of laser light irradiated to the optical disk, the offset can be compensated easily and accurately with a small scale simple circuit arrangement rather than using the larger-scale and more conventional divider attenuator combination of the prior art.

REFERENCES:
patent: 5048002 (1991-09-01), Horie et al.
patent: 5159589 (1992-10-01), Ohsato
patent: 5170384 (1992-12-01), Edahiro et al.

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