Patent ID: 7308009

Claim:
A semiconductor laser apparatus, comprising: a semiconductor laser device; a mount board on which the semiconductor laser device is mounted; and a cap portion attached to the mount board for covering the semiconductor laser device mounted on the mount board, wherein the mount board comprises: a radiation base portion made of a radiating material and comprising a mount face comprising a loading face and an extending face connected to the loading face, the semiconductor laser device being mounted on the loading face; and an interconnection of a predefined pattern which is formed on the mount face of the radiation base portion and is electrically connected to the semiconductor laser device, wherein the mount board comprises step portions which protrude perpendicularly with respect to the mount face at opposite sides of the mount face, respectively, and each of which comprises a recess portion into which a portion of the cap portion is fit, and the radiation base portion, and the step portions and the cap portion form an envelope surrounding the semiconductor laser device, and the radiation base portion and the interconnection which is formed on the extending face of the radiation base portion form an external connection terminal.