Patent ID: 7194745
Filing Date: 2007-03-20
Classification: G11B

Abstract:
1. An optical disk clamper holding mechanism that holds with a clearance, an optical disk clamper having a hub unit, an upper flange unit, and a lower flange unit, the mechanism comprising: a surrounding unit that holds said upper flange unit of the optical disk clamper; a flange unit that supports said upper flange unit of the optical disk clamper and holds said hub unit of the optical disk clamper, said flange unit protruding inwardly from said surrounding unit extending over a semicircular portion of the surrounding unit, the surrounding unit having a flange opening unit between edges in the circumferential direction; a rib formed protruding inwardly at a position opposing the flange opening unit, when said optical disk clamper moves in the direction of towards said flange opening unit, the rib stops a rim portion of said upper flange unit of said optical disk clamper, to reduce the clearance of said optical disk clamper in the direction of towards the opening unit, and when the optical disk clamper moves in a direction other than the direction towards the flange opening unit, an inner radial edge of the flange unit stops an outer surface of the hub unit of the optical disk clamper.