| 摘要 |
PURPOSE:To perform assured focusing without any shift of an optical axis, by using two sheets of plate springs of a housing to which the whole part of an optical reproducer excluding a tracking actuator is fixed and performing tracking by means of the tracking actuator. CONSTITUTION:The whole part of an optical reproducer excluding a tracking actuator is fixed to a housing 31, and this housing 31 is hanged by two sheets of parallel plate springs 40 and 40'. A coil 42 wound round a part of the housing 31 serves as a mobile coil of a moving coil actuator consisting of a permanent magnet 44 as well as yokes 43 and 45 of a magnetic circuit. A current corresponding to the tracking signal obtained by an optical detector is flowed to the coil 42. Thus the housing 31 is driven to perform tracking. The whole part of the optical reproducer excluding the tracking actuator is driven by the tracking actuator. This eliminate the generation of an optical axis shift and ensures an exact focusing. |
