Disk driving apparatus

A disk driving apparatus including:

• a plurality of vertically arranged trays, each of which permits a disk to be set thereon and removed therefrom and is capable of moving up and down;
• a single-tray disk insertion/removal opening dedicated to one of said trays which is located at either one of the two vertical ends of the combination of the trays;
• a common disk insertion/removal opening to be shared by all the other trays than said tray that is located at either one of the two vertical ends of the combination of the trays;
• a carrier mechanism for moving a desired tray to a loading position corresponding to said common disk insertion/removal opening;
• a single-tray loading mechanism for carrying a disk back and forth between said single-tray disk insertion/removal opening and the tray corresponding to the single-tray loading mechanism;
• and
• a common loading mechanism for carrying a disk back and forth between the common disk insertion/removal opening and the tray located at said loading position.

A disk driving apparatus including:

• a turn table having a seating portion for receiving a disk thereon, and a boss around which the center hole of the disk on the seating portion is fitted;
• a chucking device incorporated in the turn table and having chucking members and a biasing means, said chucking members adapted to advance out of the boss so as to chuck the disk and retreat from the boss to release the disk from the chucked state, and the biasing means adapted to apply a constant force to the chucking members in such a direction as to advance the chucking members;
• and
• a releasing means for applying a chuck-releasing force from the outside of the turn table to the chucking device so that the chucking action of the chucking device is stopped against the force applied by the biasing means.