Optical disk recording and reproducing apparatus

Details Optical disk recording and reproducing apparatus Optical disk recording and reproducing apparatus

2008-07-15

2008-07-15

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07400557

ABSTRACT:
The present invention provides an optical disk recording and reproducing apparatus having a circuit configuration whereby it is possible to prevent tracking drive signals from being offset even when the temperature of a tracking actuator drive circuit is increased. The output resistance of a low-pass filter15is composed of two serially connected resistors R2aand R2b, the resistance of the former one R2aof the serially connected resistors R2aand R2bbeing arranged to be lower than that of the latter one R2band a connecting point S between the former and latter resistors R2aand R2bbeing connected to the input side of an A/D port6, whereby the potential difference between a tracking output port12and the A/D port6is reduced as much as possible, and thereby the reference voltage value stored in a reference voltage value storing means9approaches an exact value as close as possible, which increases the accuracy of comparison results of a comparing means7substantially, and therefore a D/A conversion and offset cancel circuit10can output a tracking drive signal without offset.

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