Signal output circuit, optical pickup and optical device

An optical pickup comprising:

• a laser beam source;
• a photoreceiving element adapted to convert a laser beam from the laser beam source or a beam returning from a recording medium into electric signal;
• and
• a signal output circuit adapted to output the electric signal converted by the photoreceiving element onto a transmission line having a given transmission characteristic, wherein
• the signal output circuit includes
• a drive circuit adapted to drive an input signal by a current, and
• an output resistor which is connected to an output stage of the drive circuit and capable of adjusting the output signal waveform according to its resistance,
• the drive current of the drive circuit and the resistance of the output resistor are variable.

An optical device comprising:

• an optical recording medium;
• and
• an optical pickup, wherein
• the optical pickup includes
• a laser beam source,
• a photoreceiving element adapted to convert a laser beam from the laser beam source or a beam returning from a recording medium into electric signal, and
• a signal output circuit adapted to output the electric signal converted by the photoreceiving element onto a transmission line having a given transmission characteristic,
• the signal output circuit includes
• a drive circuit adapted to drive an input signal by a current, and
• an output resistor which connected to an output stage of the drive circuit and capable of adjusting the output signal waveform according to its resistance,
• the drive current of the drive circuit and the resistance of the output resistor are variable.