Patent ID: 8879133

Claim:
A multi-beam light source device comprising: a vertical cavity surface emitting laser device having monolithically fabricated multiple light sources; an optical sensor to monitor an output of beams of light emitted from the vertical cavity surface emitting laser device; a printed circuit board on which a driving circuit is formed to drive the vertical cavity surface emitting laser device based on monitoring signals from the optical sensor; a coupling lens to change the beams of light emitted from the vertical cavity surface emitting laser device to a predetermined state; a transparent board on which a wiring pattern is formed to wire an electrode of the vertical cavity surface emitting laser device and a terminal of the driving circuit; and a holding unit to integrally hold the vertical cavity surface emitting laser device, the optical sensor, the printed circuit board, the coupling lens, and the transparent board, wherein the vertical cavity surface emitting laser device is mounted to the transparent board with an emitting surface of the vertical cavity surface emitting laser device in contact with a surface of the transparent board on which the wiring pattern is formed, the transparent board is mounted on the printed circuit board with the surface on which the wiring pattern of the transparent board is formed in contact with the printed circuit board, and the printed circuit board is supported by the holding unit with a surface of the printed circuit board on which the transparent board is mounted pressed against and supported by a mounting surface formed on the holding unit which is orthogonal to an optical axis of the coupling lens, wherein the optical sensor is mounted on the transparent board with a light-receiving surface of the optical sensor in direct contact with the surface of the transparent board on which the wiring pattern is formed.