Patent ID: 8169457

Claim:
A light source apparatus comprising: a circuit board on which a light source unit and a photodetector are mounted, the light source unit including a vertical-cavity surface-emitting light source and a package, the vertical-cavity surface-emitting light source being formed with a two-dimensional array of a plurality of light-emitting sources arranged on a plane vertical to an optical axis along which an optical beam is emitted, the package housing the vertical-cavity surface-emitting light source, the photodetector detecting intensity of the optical beam emitted from the light source unit, a surface of the photodetector being parallel to a surface of the circuit board; an optical element holder that includes a beam splitting device that splits the optical beam emitted from the vertical-cavity surface-emitting light source into a plurality of optical beams, and a condense lens that condenses one of the optical beams split by the beam splitting device to the photodetector; and an intermediate holder that is arranged between the circuit board and the optical element holder, the intermediate holder including a first positioning unit and a second positioning unit, the first positioning unit being in contact with the package and determining a first positional relationship between the intermediate holder and the circuit board along the direction vertical to the optical beam, the second positioning unit determining a second positional relationship between the intermediate holder and the optical element holder along the direction vertical to the optical beam, the intermediate holder being joined to the circuit board to cover an area of the circuit board on which the light source unit is mounted to thereby make contact with the package via the first positioning unit such that the vertical-cavity surface-emitting light source is positioned and fixed and being joined to the optical element holder to thereby position the beam splitting device and condense lens to the vertical-cavity surface-emitting light source and the photodetector along the direction vertical to the optical beam.