Patent ID: 8059148

Claim:
A light source device, comprising: a semiconductor laser; a coupling lens that converts laser light from the semiconductor laser to a light flux, the coupling lens having a first side and a second side opposite to the first side, the coupling lens having an outer peripheral surface connecting the first side and the second side; a holder that holds the semiconductor laser and the coupling lens in a manner that the first side of the coupling lens confronts the semiconductor laser; and a photopolymerizable resin, a part of the photopolymerizable resin being provided between the outer peripheral surface of the coupling lens and the holder and the entire remaining part of the photopolymerizable resin protruding from between the outer peripheral surface of the coupling lens and the holder in a direction defined from the first side to the second side, such that no part of the photopolymerizable resin is protruding from between the outer peripheral surface of the coupling lens and the holder in a direction defined from the second side to the first side, the photopolymerizable resin being cured to fix the coupling lens on the holder.