Patent ID: 6934239

Claim:
A light source unit of an optical head for an optical disc drive, said light source unit selectively emitting one of a plurality of laser beams toward an objective lens of said optical head, said light source unit comprising: a laser diode having a plurality of light emitting points, said plurality of light emitting points spaced from each other by a predetermined minute amount, one of a plurality of laser beams having different wavelengths being selectively emitted from said plurality of light emitting points, respectively; a collimating lens that collimates each of the plurality of laser beams respectively emitted from said plurality of light emitting points, said plurality of laser beams passed through said collimating lens proceeding in different directions; and a transparent optical path compensation element having a predetermined dispersion characteristic, said optical path compensation element receiving each of said plurality of laser beams emerging from said collimating lens, each of the plurality of laser beams received by said optical path compensation element passing through and emerging from said optical path compensation element in a direction substantially parallel with the optical axis of said objective lens, said optical path compensation element reducing an angle formed between the optical paths of said plurality of laser beams.