| 摘要 |
An apparatus is provided including at-least a fixed member for guiding a pushed-out disk body and a movable member which moves in a direction opposing the fixed member and becomes free in the contact with the pushed-out disk body. An elasticity member is provided for drawing this movable member to the direction of the fixed member, and detection device is for detecting the movement of the movable member. A signal handling device is provided for processing a signal from the detection device and for measuring the diameter of the disk body. A rotating body is provided for pushing out a disk body. An angle of rotation detection device may also be provided for detecting the rotation angle of the rotating body.
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