Patent ID: 8327393

Claim:
A disc-clamping mechanism comprising: a clamping plate sandwiching a disc by cooperating with a rotatable turntable; and a clamp base which rotatably holds the clamping plate, allowing movement between a clamp-position where the clamping plate contacts with the disc on the turntable, and a clamp-released position where the clamping plate is isolated from the disc, wherein the clamping plate comprises a surface plate portion pressing the disc toward the turntable when the clamp base is in the clamp-position, a small-radius body portion placed concentrically with the surface plate portion and having an outer diameter smaller than that of the surface plate portion, and a flange portion being parallel to the surface plate portion and protruding more than an end portion in an axial direction of the small-radius body portion, wherein the clamp base is integrally formed while including a thin-plate shaped holding portion interposed between the surface plate portion and the flange portion on the clamping plate, a stopper piece facing an end surface of the flange portion in the clamp-position, and a bent portion extending from the holding portion and having an elongated hole through which the flange portion is passed from the stopper piece side to the holding portion side in a diameter direction of the flange portion, wherein the holding portion has a cut hole which receives the small-radius body portion, the cut hole being adjacent to the elongated hole of the bent portion.