Patent ID: 8295147

Claim:
An optical pickup apparatus comprising: a circuit board; a laser diode mounted on one face of the circuit board; and a high-frequency superimposition integrated circuit mounted on the other face of the circuit board, the high-frequency superimposition integrated circuit including a high-frequency signal generation circuit, the circuit board having an area greater than or equal to an area occupied by a lead pin of the laser diode and a region smaller than or equal to twice a region where the laser diode is mounted, a high-frequency signal generated from the high-frequency signal generation circuit being superimposed on a driving signal to be supplied to the laser diode, in order to take a measure against noise caused by return light of the laser diode, wherein the high-frequency superimposition integrated circuit includes a lead and is packaged, and at least a part of the lead or at least a part of an outline of the package is arranged in a region between a region where the lead pin is arranged and an outline of the laser diode.