Patent ID: 6594225
Filing Date: 2003-07-15
Classification: G11B

Abstract:
A mechanism for monitoring rotation of an information disk, comprising:a turntable having a surface on which the information recording disk is disposed; a damper coaxially rotated with the turntable while fastening the information recording disk onto the turntable; a sensor unit including a photo emitter and a photo detector opposed to each other such that respective optical axes are aligned on a straight line and disposed substantially parallel to the turntable surface; and an interception member formed with the clamper for periodically intercepting the light emitted from the photo emitter so that the sensor unit detects the light emitted from the photo emitter, wherein the clamper rotates together with the information recording disk, wherein the photo emitter is disposed at an inner circumferential side of the damper relative to the interception member, and the photo detector is disposed at an outer circumferential side of the damper relative to the interception member.