Patent ID: 8220010

Claim:
A disc drive having a casing including a top cover and a bottom cover, a base arranged in said casing, a unit mechanism installed on said base, a chassis installed in said unit mechanism, an optical head and a spindle motor installed in said chassis, and a disc tray on which a disc is carried into and out from said disc drive, comprising: a rotation load reducing member including a plate-like member arranged between said top cover and said disc on said disc tray; a clearance adjustment member which movably supports said rotation load reducing member; and an actuator device for driving said clearance adjustment member; wherein said actuator device drives said clearance adjustment member in such a way that, at the time of disc rotation, a clearance between said rotation load reducing member and said disc on said disc tray becomes a predetermined value; and wherein said actuator device drives said clearance adjustment member based on the rotational speed of said disc.