Patent ID: 6868549

Claim:
A disk clamp apparatus, comprising: a disk mount surface part on which a record medium having a disk shape is mounted, the disk mount surface part comprising: a part which faces an innermost circumference surface of the record medium, and a part which faces an outer circumference surface situated further out than the innermost circumference surface, wherein the part which faces the innermost circumference surface of the record medium has a same height as a height of the part which faces the outer circumference surface situated further out than the innermost circumference surface, further comprising a clamp part provided at a center of the disk mount surface for clamping an inner circumference of the record medium, and wherein the clamp part has a projection part projecting from the clamp part to the part which faces the innermost circumference surface of the record medium, and the projection part has a same height as a height of the part which faces the outer circumference surface situated further out than the innermost circumference surface of the record medium.