Flutter-reducing disk device

摘要

A recess ( 16 a 3 ) is provided to be continuous with the circumferential edge of a tray recess ( 16 a 2 ) of a disk tray ( 16 ) housing an optical disc ( 28 ) to allow a pickup ( 45 ) to move without contacting anything. A cover section ( 17 c) having a substantially tongue-like shape adapted to the recess ( 16 a 3 ) is projected integrally from a rotor support member ( 17 ) covering the tray recess ( 16 a 2 ) from above and defining a substantially cylindrical housing space ( 18 ) for coaxially housing the optical disc ( 28 ), the cover section continuously covering the recess ( 16 a 3 ) of the disk tray ( 16 ) and the housing space ( 18 ). Even when the optical disc ( 28 ) is rotated at a high speed, flutter attributable to airflow or a difference between pressures on both sides of the optical disc ( 28 ) can be reduced to allow the optical disc ( 28 ) to rotate with stability.