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上传时间: 2010-06-08
详细说明： The Veridicom FPS200 Solid-State Fingerprint Sensor is a direct contact, fingerprint acquisition device. It is a high performance, low power, low cost, capacitive sensor composed of a two-dimensional array of metal electrodes in the sensing array. Each metal electrode acts as one plate of a capacitor and the contacting finger acts as the second plate. A passivation layer on the device surface forms the dielectric between these two plates. Ridges and valleys on the finger yield varying capacitor values across the array, and the r esulting varying discharge voltages are read to form an image of the fingerprint. The FPS200 is manufactured in standard CMOS technology. The 256 ´ 300 sensor array has a 50 mm pitch and yields a 500-dpi image. The sensor surface is protected by a patented, ultra-hard, abrasion and chemical resistant coating. ...展开收缩
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