| 摘要 |
<p>To enable position or distance of sensing target making approach, etc. to the range of sensing area to be detected securely with simple configuration at low cost and improve latitude of designing, position detector 100 includes capacitance sensor unit 10 and detecting circuit unit 20. Capacitance sensor unit 10 includes first and second sensing electrodes 11 and 12 and dielectric material 19 therebetween. Dielectric material 19 has range L of sensing area defined on its sensing surface 19a. Detecting circuit unit 20 includes selector switches SWA and SWB, capacitance sensing circuits 21 and 22, A/D converters 23 and 24, and arithmetic processing circuit 25. Arithmetic processing circuit 25 judges and detects the position of sensing target in range L of sensing area based on detected values of capacitances C1 and C2 sensed by first and second sensing electrodes 11 and 12 under switching control on selector switches SWA and SWB.</p> |
