Patent ID: 8081550

Claim:
An optical pickup device providing a function of reproducing an information signal from a multilayer optical disc having a plurality of information-signal recording layers spaced by a predetermined spacing from each other, comprising: a first light detection section including a plurality of beam receiving surfaces to detect a focus error signal; a second light detection section including at least two beam receiving surfaces located at positions on a same plane on which said first light detection section is located and adjacent to said first light detection section; and means which subjects detection signals obtained from said beam receiving surfaces of said second light detection section to predetermined calculating operation to obtain a signal, amplifies or attenuates the calculated signal by multiplying the calculated signal by a predetermined coefficient value, and then subtracts the amplified or attenuated signal from said focus error signal detected from said first light detection section; wherein said coefficient value, by which said detection signal obtained from said second light detection section is amplified or attenuated, is set at different values according as said spacing between said information-signal recording layers laminated within said multilayer optical disc.