PROBLEM TO BE SOLVED: To obtain a sufficient electrostatic discharge durability by suppressing the circuit destruction by an electrostatic discharge from a subject.SOLUTION: Between a detecting element 1 and a response signal forming section 3, a protection section 6 which on/off-controls the electric connection between them is installed. When the contact or the contiguity of the subject 10 to the detecting element 1 is not sensed, the detecting element 1 and the response signal forming section 3 are electrically separated by the protection section 6, and at the same time, the static electricity of the subject 10 which is applied from the detecting element 1 is discharged to a grounding electric potential GND. When the contact or the contiguity of the subject 10 is sensed, the detecting element 1 and the response signal forming section 3 are electrically connected after the static electricity discharge period from the sensing has passed.COPYRIGHT: (C)2010,JPO&INPIT【課題】被検体からの静電気放電による回路破壊を抑制し、十分な静電気放電耐性を得る。【解決手段】検出素子1と応答信号生成部3との間に両者の電気的接続をオンオフ制御する保護部6を設け、検出素子1に対する被検体10の接触または近接検知していない場合には、保護部6により検出素子1と応答信号生成部3とを電気的に切り離すとともに、検出素子1から印加された被検体10の静電気を接地電位GNDに放電し、被検体10の接触または近接を検知した場合には、当該検知から静電気放電期間経過後に、検出素子1と応答信号生成部3とを電気的に接続する。【選択図】 図1
