| 摘要 |
A spindle motor is lifted up to an attachment position, and a yoke inside a disc clamp is then attracted by a circular ring magnet in a turntable on the spindle motor. When the spindle motor is lowered down, the magnetic conductive material is attracted by a circular ring magnetic on a chucking plate. Thus, the disc clamp is moved up-and-down automatically by means of magnetic attraction, and interference with a cartridge is prevented. By comparison with prior art disc clamping apparatus which utilizes a spring or lever mechanism, the present invention can reduce both an operating space and a number of components. Also, the complexities of design and assembly are reduced, and collisions between devices are avoided.
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