Patent ID: 7581235

Claim:
A chucking apparatus disposed on a rotor-side receiving surface of a spindle motor, said chucking a apparatus comprising: a hub body having a dish-like shape; a plurality of pawl bodies provided in a radial direction of said hub body of said rotor-side receiving surface of said spindle motor such that said pawl bodies can move, and a center hole of a disk is pressed by said pawl bodies to hold said disk; and a resilient member for biasing said pawl bodies outward of said hub body, wherein: each of said pawl bodies includes a pawl portion which comes into contact with said disk, and a pawl-side stopper for limiting outward movement of said pawl bodies caused by said resilient member, for each of said pawl bodies, said hub body includes a pawl opening through which said pawl portion can project outward, and a hub-side stopper which abuts against said pawl-side stopper, and for each of said pawl bodies, a contact surface of a lower end of said pawl body with said rotor-side receiving surface is of an arc shape.