Disk holding mechanism and disk holding mechanism clamper

A clamper of a disk retaining mechanism comprising:

• a turntable unit for loading a disk thereon;
• a motor unit for transferring rotation to said turntable unit;
• and
• a clamper unit for holding and retaining said disk with said turntable unit, said clamper unit comprising:
• a disk depressing member for depressing said disk;
• a sheet member of non-magnetic material or weak magnetic material disposed within said disk depressing member and on said magnet at one side closer to said turntable unit, wherein said magnet is disposed on said sheet member;
• and
• a centering member disposed at the about center of said disk depressing member,
• wherein said disk depressing member is attracted to said turntable unit by an attractive force of said magnet, and thereby said centering member is thrust toward said turntable unit side.

A clamper of a disk retaining mechanism having:

• a turntable unit for loading a disk thereon;
• a motor unit for transferring rotation to said turntable unit;
• and
• a clamper unit for holding and retaining said disk with said turntable unit, said clamper unit comprising:
• a disk depressing member for depressing said disk;
• and
• a centering member disposed within said disk depressing member, wherein
• said centering member is engaged within said disk depressing member in concentric with said disk depressing member in a vertically slidable manner,
• said disk depressing member is provided with at least one pair of a first projection and a second projection in a hole thereof for engagement with said centering member, and the second projection is located below the first projection at regular intervals,
• said centering member has at least one notch similar in shape to said first projection, and thereby
• said centering member is retained by said second projection of said disk depressing member when said centering member is turned while being depressed.