The mechanism to read the insert of the CD reader is the most important part because it must keep control and move the horizontal radial off-read sheets khoe. While the laser head moves away from the center of the coil band will move faster, according to the equation that vertical speed, touch the pad spacing in the horizontal radius of the read head moves away, it means that the edges of the CD will have a maximum speed. Therefore, the reading system must be inserted to reduce the speed of the motor so that the velocity of the CDs and the information to pass through a fixed-rate reader will not read wrong.
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