| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that radiation efficiency is worse in a heat radiation member for radiating heat that is generated by optical pickup since the area of the member is small. SOLUTION: On the back 101 of an opposite surface in the laser radiation direction of a laser unit 10, a radiation member 12 is provided. The radiation member 12 has a top board section 121 that is larger than the projection area of the laser unit 10, and a curvature section 122 that is extended from the top board section 121 and curves in the radiation direction of the laser unit 10, thus increasing the area of the radiating member 12, and hence improving radiation efficiency.
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