专利名称：Capacitance measuring apparatus and
method
发明人：Kinoshita, Masahiro,Urata, Hideyuki,Tsugui,
Hideshi,Tanabe, Yoshihiro
申请号：EP05019336.6申请日：20050906公开号：EP1635147A2公开日：20060315
专利附图：
摘要：Whether a human body is touching or not is detected highly accurately at highspeed. Switch SW1 is turned on to charge condenser Ca by power supply Vcc. The switch
SW1 is turned off to transfer the electric charge charged in the condenser Ca to
condensers Cs and Cx. The switches SW2 and SW3 are repeatedly turned on and off for apredetermined short time, and thus the electric charge charged in the condenser Ca isslowly discharged through resistor R. The unknown charging voltage Vx of the condenserCx is compared with the reference voltage Vref by comparator Comp, and the unknowncapacitance of the condenser Cx is computed based on the number of times to countturning on and off until it is smaller than the reference voltage Vref. When the computedunknown capacitance of the condenser Cx is the value near the capacitance of a humanbody, it is determined that a human body is touching. The invention can be applied to atouch sensor.
申请人：OMRON CORPORATION
地址：801, Minamifudodo-cho, Horikawahigashiiru, Shiokoji-dori, Shimogyo-ku Kyoto-shi, Kyoto 600-8530 JP
国籍：JP
代理机构：Kilian, Helmut
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