US Patent 7876649 Optical disc recording and reproducing apparatus

A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value α when information is reproduced from an optical disc so as to record the determined focus balance value α0 in a balance value storing portion and to set the same in a first amplifier of a focus error signal generating circuit, and a correction executing portion for reading the focus balance value α0 stored in the balance value storing portion when information is recorded in the optical disc 2 so as to correct the read value to be a focus balance value α1, which is set in the first amplifier of the focus error signal generating circuit.