Patent ID: 6785090
Filing Date: 2004-08-31
Classification: G11B

Abstract:
A disk clamp for securing recording disks with circumferential recording tracks on glass substrates to a spindle shaft in an disk recording apparatus, the disk clamp for disk recording apparatus comprising:a cylindrical hub adapted to be secured to the spindle shaft and having an axis of rotation; a top clamp for holding a top of the recording disks concentrically disposed on the hub; screws for securing the top clamp to the hub; a ring-shaped thermal strain buffer at a portion of contact between an adjacent recording disk and one of the hub and the top clamp, such that the thermal strain buffer is completely axially outboard of the recording disks; wherein the thermal strain buffer is formed from a homogeneous material that is stable in terms of chemical properties over an operating temperature range of the disk recording apparatus, and has a thermal expansion coefficient similar to that of the glass substrates.