Patent ID: 8363083

Claim:
A light source device comprising: a light-emitting element; a coupling lens configured to condense a beam of light emitted from the light-emitting element; and a holding member configured to hold the light-emitting element and the coupling lens, wherein the holding member has an adherend that is opposite to a surface of the coupling lens facing toward the light-emitting element in a direction of an optical axis of the coupling lens, and part of the surface of the coupling lens facing toward the light-emitting element is bonded to the adherend of the holding member, wherein the holding member includes a plurality of protecting portions each of which is separate from the coupling lens in a direction perpendicular to the optical axis of the coupling lens, and protrudes downstream beyond a position of a surface of the coupling lens from which the beam of light goes out, in a direction of travel of the beam of light, adjacent protecting portions being separate to form an opening that renders a peripheral end of the coupling lens accessible, and wherein two or more openings formed between the adjacent protecting portions are configured to extend beyond the coupling lens to a side on which the light-emitting element is disposed, and at least one pair of the two or more openings has openings disposed opposite to each other with the coupling lens positioned therebetween.