Optical information carrier with servo control circuit recording or replaying method
A servo controller and optical information technology, applied in the field of compensating mechanical vibrations and processing error signals in servo control circuits, can solve problems such as not being able to function sufficiently reliably and not enough to compensate for strong mechanical effects, achieving good tracking control and easy management , to cancel the effect of interference
Inactive Publication Date: 2005-11-23
DEUTSCHE THOMSON-BRANDT GMBH
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Problems solved by technology
Although the need for a shock detector is avoided with this known device, strong mechanical effects on the device are not sufficiently compensated due to the limitation of the gain, with the result that the method does not function sufficiently reliably in the case of portable devices
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[0018] The invention relates to a method for processing error signals in a servo control circuit of an optical information carrier recording or playback device, the method having the following steps: deriving an error signal, in particular a tracking error signal and / or A focus error signal, a nonlinear amplification error signal, and a control signal derived from the nonlinear amplification error signal to control a corresponding transmission mechanism of the optical scanning unit. Since the sign includes direction information, it is preferable to add the sign of the error signal to the non-linearly amplified error signal. Non-linear processing of the error signal can be achieved by squaring the error signal. Other non-linear amplification functions are possible and selected as a function of the desired non-linearly amplified error signal.
[0019] figure 1 Shows a block diagram of a servo control circuit according to the invention, in which the optical scanning unit 1 opt...
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Recording or playback devices for optical recording carriers have a servo control circuit which controls the tracking and the focus of an optical scanning unit 1 with reference to an error signal. According to the invention, the error signal is non-linearly amplified upstream of the servo controller, in order to process strong external mechanical effects, normally referred to as shocks, in such a way that the tracking and the focus are retained or adjusted. If there is a defect, such as a scratch on the disc etc., a defect detector and a linear amplifier connected in parallel with the non-linear amplifier are additionally used, the linearly amplified or non-linearly amplified error signal being fed to the servo controller as a function of the output signal of the defect detector. The sign of the error signal, which includes direction information, is retained in the case of the non-linearly amplified error signal.
Description
[0001] This application is a divisional application of the invention patent application with application number 97119514.5 and application date of September 19, 1997. technical field [0002] The invention relates to a recording or playback device for an optical information carrier with a servo control circuit and a method for processing error signals in the servo control circuit. In particular, the present invention relates to a servo control circuit of a recording or playback device of an optical information carrier capable of compensating for mechanical shocks and a method for compensating for mechanical shocks. Background technique [0003] Recording and playback devices for optical information carriers have servo control circuits in order to compensate for offsets or errors such as tracking errors and / or focus errors, the error signals being derived from the measurements of the optical scanning unit and processed in the servo unit to form control signals , these control...
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IPC IPC(8): G11B7/09
CPCG11B7/0948G11B7/0943G11B20/1833G11B7/0938G11B20/10027
Inventor 弗里德里克·菲尔德纳沃尔克·波利茨高木广人
Owner DEUTSCHE THOMSON-BRANDT GMBH