Patent ID: 7924486
Filing Date: 2011-04-12
Classification: G02B

Abstract:
1. A Micro-Electronic-Mechanical-System (MEMS) scan controller with inherent frequency applied to a laser scanner unit formed by a laser source emitting laser light, a MEMS mirror that drives a reflection mirror by a resonant way to scan the laser light forward/reverse through the object, a photoelectric detector (PD) that receives scanning light and turns the scanning light into PD signals, a scan lens that turns the scanning light into a linear relationship between angle and time and a laser controller that controls emitting of the laser source with preset frequency and time interval; wherein the MEMS scan controller comprising: a control logic, a control signal output unit and a bridge circuit; wherein the MEMS scan controller adjusts amplitude of the MEMS mirror by using the inherent resonant frequency of the MEMS mirror; the control logic receives PD signals from the PD, calculates time interval of the PD signals to generate modulation signal of the MEMS mirror sent to the bridge circuit and amplitude variation signal of the MEMS mirror sent to the control signal output unit; the control signal output unit receives the amplitude variation signal from the control logic and turns the amplitude variation signal into stable signal that control the laser controller; the bridge circuit receives the modulation signal from the control logic and turns the modulation signal into driving signal that drive the MEMS mirror to oscillate; thereby the laser scanner sends scan data string with preset frequency and time interval within effective scan window.