Patent ID: 7169360

Claim:
A rotary drive for spinning a disc about a symmetry axis thereof, the rotary drive comprising: a motor and a spindle, the spindle having an axis of rotation; a stationary member; a rotary member supported for rotation with the spindle, the rotary member being formed with a top plane having a centering guide for receiving the disc so as to force the symmetry axis of the disc into alignment with said axis of rotation, wherein the motor is operative for driving the rotary member for contact-free rotation relative to the stationary member; and a vacuum source connected with the stationary member and communicating with the rotary member or a part rotating with the rotary member for applying sub-pressure to the disc in order to hold the disc on the rotary member when spinning the disc about its symmetry axis, wherein there is a sub-pressure connection for providing sub-pressure to the rotary member defined by mutually mating surfaces of the rotary and the stationary member, respectively, that are in contact-free rotation relative to each other.