| 摘要 |
<p>An integral optical head (1) comprises an actuator (50) whose moving part (5) is fitted with a laser optical system (20) including a semiconductor laser (22) and a light reception device. The moving part (5) is constituted by combining a metallic heat radiator (10) with a heat insulating member (9) made of plastics. The heat radiator is connected thermally to the semiconductor laser, and a coil of the actuator is fixed to this heat radiator through the heat insulating member. Accordingly, heat generated by the semiconductor laser is transferred to the heat radiator and is efficiently dissipated into the external space from the surface of the heat radiator. Because the coil and the laser optical system are thermally isolated, the laser optical system is not heated by the coil during the operation of the actuator. Further, because rigidity of a holder can be improved while avoiding the increase of the weight which will otherwise impede the operation, detrimental resonance at the time of driving of the actuator can be prevented. Accordingly, heat radiation/cooling characteristics of the semiconductor laser can be remarkably improved, and a stable operation and reliability of the apparatus can also be improved.</p> |
