Abstract-The voice coil motor VCM will be removed in the structure, and we have designed a new high-precision displacement measurement of the circuit, which mainly includes focus error signal of the DVD (S curve) processing circuit, LD control circuit, open signal logic circuit, S curve linearity zone selection and location to determine the circuit, the normalized circuit and other components, to achieve the accurate measurement of the micro-component (geometric dimensions for a few millimeters to a few microns, more precision parameters for the micro nanometer scale). It has simple structure, good linearity, high resolution, anti-interference capability, measuring in any environment., and other outstanding features.
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