发明授权
- 专利标题： Capacitance detection device and drive method thereof, fingerprint sensor, and biometrics authentication device
- 专利标题（中）： 电容检测装置及其驱动方法，指纹传感器和生物识别装置
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申请号： US10808523申请日： 2004-03-25
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公开(公告)号： US07053633B2公开(公告)日： 2006-05-30
- 发明人: Hiroyuki Hara
- 申请人： Hiroyuki Hara
- 申请人地址： JP Tokyo
- 专利权人： Seiko Epson Corporation
- 当前专利权人： Seiko Epson Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oliff & Berridge, PLC
- 优先权： JP2003-112842 20030417
- 主分类号： G01R27/26
- IPC分类号： G01R27/26 ; G06K9/00
摘要：
The object of the present invention is to provide a high-precision fingerprint sensor. In order to achieve this object, the fingerprint sensor of the present invention comprises a matrix portion in which capacitance detection circuits, which each output a detection signal corresponding to the capacitance formed between the capacitance detection circuit and a fingerprint, are arranged in the form of a matrix; and an amplification circuit for amplifying this detection signal. The amplification circuit functions as a signal source for outputting a detection signal to the capacitance detection circuit and is constituted such that the detection signal is transmitted from the amplification circuit to the low potential source line via the capacitance detection circuit.
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