Patent ID: 7106681

Claim:
An optical head comprising: an optical detector; a plurality of laser light sources different in wavelength from each other, where said plurality of laser light sources include a plurality of semiconductor lasers disposed on a single substrate in close proximity with said optical detector, and where emerging light flux from said plurality of laser light sources are each in a same direction and substantially parallel with each other, and have anisotropic light flux distributions oriented such that a major axis of the anisotropic light flux distributions of said plurality of laser light sources are pre-positioned at a substantially common angle; a collimating lens to receive a plurality of laser beams as emitted from the plurality of laser light sources a beam reshaping prism to reflect the plurality of laser beams as emitted from the laser light sources and passed through said collimating lens, said beam reshaping prism including more than one reflection surface and refraction surface; and optical convergence means for focusing the plurality of laser beams reflected from the beam reshaping prism into optical spots on an optical information storage medium; wherein said beam reshaping prism beam reshape at least two laser beams of different wavelengths by enlarging fluxes of the at least two laser beams in a same direction as one another, wherein said beam reshaping prism includes a plurality of reflection planes for reflection of laser beams of different wavelengths.