| 摘要 |
An information recording/reproducing apparatus has an LD for emitting a light beam and an optical member for irradiating an optical disc with the emitted light beam. The LD includes a stem having a first face and a second face, a heat sink joined to the first face, a lead penetrating the first and second faces, and a chip conductively attached to one end of the lead. The heat sink has an inner radius part in which an opening for housing one end of the lead and the chip is formed, and an outer radius part provided on the side opposite to the opening.
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