Patent ID: 7075879

Claim:
An optical pickup device for a relatively thick disc and/or a relatively thin disk, comprising: a mount; first and second light services emitting light beams having different wavelengths; an optical module in which the first and second laser light sources are horizontally mounted on the mount and one of the first and second light sources is rotated by a predetermined angle with respect to the other light source; a first grating splitting the light beams emitted from the second light source; a beam splitter changing optical paths of the light beams emitted from the first and second laser light sources; an objective lens focusing the light beams passing through the beam splitter onto the relatively thick disc or the relatively thin disc; a photodetector receiving an incident light beam, which is reflected by the relatively thick disc or the relatively thin disc and passes through the objective lens and the beam splitter; and a second grating arranged on an optical axis between the beam splitter and the photodetector and correcting a position of a light spot formed on the photodetector.