Patent ID: 6606284
Filing Date: 2003-08-12
Classification: G11B

Abstract:
A gain controlling apparatus comprising:a roughly adjusting device for roughly adjusting a gain of a generation signal, which is generated on the basis of a light detection signal obtained by receiving a reflection light of a light beam from an information recording medium; a finely adjusting device for finely adjusting the gain on the basis of a result of roughly adjusting the gain by said roughly adjusting device; a memory device for storing a plurality of values for adjusting the gain generated during a previous occasion of gain adjustment in time series; and a controlling device for controlling said roughly adjusting device to roughly adjust the gain at a current occasion of gain adjustment on the basis of the respective stored values for adjusting the gain and also controlling said finely adjusting device to finely adjust the gain on the basis of a result of roughly adjusting the gain at the current occasion by said roughly adjusting device, wherein said controlling device comprises a predicting device for predicting a current adjustment value, which is an adjusted value for the gain roughly adjusted at the current occasion by said roughly adjusting device, and said controlling device controls said roughly adjusting device to roughly adjust the gain at the current occasion on the basis of the predicted current adjustment value.