Patent ID: 6931653

Claim:
An optical disk reading device, comprising: a substrate below which a CD is loaded, the substrate having an opening; a base ring fixed to the opening of the substrate; a movable ring that is coupled to the base ring in a manner such that the movable ring moves rotationally and vertically with respect to the base ring; a clamp that is movably coupled to the movable ring, and which extends through the opening of the substrate when the movable ring moves with respect to the base ring; an elastic component fixedly secured to the clamp and the substrate; means for movably connecting the movable element to the substrate; and wherein the movable ring has a plurality of first spiral grooves that extend in a first direction, and a plurality of second spiral grooves that extend in a second direction opposite to the first direction, wherein the base ring has a first plurality of pins that are received in corresponding first spiral grooves, and wherein the clamp has a second plurality of pins that are received in corresponding second spiral grooves.