- 专利标题: Capacitive distance sensor
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申请号: US40261申请日: 1998-03-09
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公开(公告)号: US6114862A公开(公告)日: 2000-09-05
- 发明人: Marco Tartagni , Bhusan Gupta , Alan Kramer
- 申请人: Marco Tartagni , Bhusan Gupta , Alan Kramer
- 申请人地址: TX Carrollton
- 专利权人: STMicroelectronics, Inc.
- 当前专利权人: STMicroelectronics, Inc.
- 当前专利权人地址: TX Carrollton
- 优先权: EPX96830068 19960214
- 主分类号: G01B7/00
- IPC分类号: G01B7/00 ; A61B5/117 ; G01B7/004 ; G01B7/02 ; G01B7/287 ; G01B7/34 ; G06K9/00 ; G01R27/26
摘要:
A distance sensor has a capacitive element in turn having a first capacitor plate which is positioned facing a second capacitor plate whose distance is to be measured. In the case of fingerprinting, the second capacitor plate is defined directly by the skin surface of the finger being printed. The sensor comprises an inverting amplifier, between the input and output of which the capacitive element is connected to form a negative feedback branch. By supplying an electric charge step to the input of the inverting amplifier, a voltage step directly proportional to the distance being measured is obtained at the output.
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