Patent ID: 6335909
Filing Date: 2002-01-01
Classification: G11B

Abstract:
A multi-layer recording medium reproducing device having an automatic adjustment mode of automatically performing servo adjustment to reproduce a multi-layer recording medium, said device comprising:a storing section which, during the automatic adjustment mode, performs the servo adjustment of recording layers of the multi-layer recording medium respectively for predetermined periods of time, and stores the resultant servo adjustment values respectively for the recording layers, the servo adjustment values including offset, gain and balance; a stage of differential amplifiers; a servo adjustment control section which, during a reproduction of the multi-layer recording medium, reads from said storing section the offset, gain and balance servo adjustment values corresponding to one of the recording layers to be reproduced, and performs the servo adjustment to a first motor of a focus servo circuit and to a second motor of a tracking servo circuit to reach the offset and gain servo adjustment values thus read and outputs the balance servo adjustment value to the stage of differential amplifiers, wherein the servo adjustment control section also receives signals directly from the focus and tracking servo circuits during the servo adjustment; and an optical pickup that includes a plurality of photo-receiving elements, wherein the stage of differential amplifiers amplifies, based upon the balance servo adjustment value, output received from a first set of the plurality of photo-receiving elements to provide input to the tracking servo circuit and output received from a second set of the plurality of photo-receiving elements to provide input to the focusing servo circuit.