http://www.usa.canon.com/cusa/semiconductor/products/encoder_optolectronic_components/laser_scanner/gm_series?pageKeyCode=writeReviewPage
GM Series
Features
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Canon Proprietary LED Optical Encoder (Digital Position Sensor)
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Digital Servo Controller
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High Position Repeatability and Linearity
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Ultra Low Thermal Drift
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Sophisticated Self Tuning & X Galvo Matching SW