Patent ID: 6839956

Claim:
A method of assembling a disc in a disc apparatus, comprising: mounting a disc onto a hub of a spindle motor in a disc apparatus in a state capable of being moved with respect to the hub of the spindle motor in a direction of a disc radius; providing first and second flat members arranged in parallel at opposite sides of the disc mounted on the hub, in a symmetrical manner with respect to a center axis of the hub, the first and second flat members each having a flat surface facing an outer circumferential edge of the disc; pressing the first flat member having a flat surface toward an outer circumferential edge of the disc in a first direction of a center axis of the hub, so as to bring an inner circumferential edge of the disc into contact with an outer circumferential surface of the hub; pressing the second flat member having a flat surface toward the outer circumferential edge of the disc in contact with the first flat member and the outer circumferential edge of the disc in second direction opposite to said first direction, to a half of an amount of tolerance between the inner circumferential edge of the disc and the outer circumferential surface of the hub, so as to center the disc with respect to the center axis of the hub in both vertical and horizontal directions; and fixing the disc to the hub of the spindle motor by a clamp member.