Patent ID: 7218598

Claim:
An optical pickup comprising: a light source module in which first and second light sources which emit first and second light beams of different wavelengths are formed in a single package; an objective lens which focuses the first and second light beams and forms a light spot on a recording surface of a recording medium; a collimating lens which directs the first and/or second light beams into convergent light or divergent light so that the convergent light or the divergent light is incident on the objective lens, the optical pickup being a finite optical system; an optical path changer which converts traveling paths of the first and second light beams; a photodetector which receives the first and second light beams reflected from the recording medium and then passed through the objective lens and the optical path changer, and detects an information signal and/or an error signal; a first optical element which is disposed on the traveling paths of the first and second light beams, operates as a lens only for one of the first and second light beams, and corrects a position difference between the first and second light sources along a traveling direction of light; and a second optical element which is disposed on the traveling paths of the first and second light beams and matches traveling optical axes of the first and second light beams with each other.