Detection circuit of piezoelectric cable

圧電ケーブルの検知回路

Abstract

【課題】圧電ケーブルはケーブル長が長くなるほど発生電圧が小さくなり、回路の増幅率を上げて検知していたが、圧電ケーブルの長さが長くなっても、静電気などの電気的なノイズに強い回路を目的とした圧電ケーブルの検知回路を提供すること。 【解決手段】電荷を発生する圧電ケーブル6の外側電極4を金属箔の被覆にし、金属箔の外側電極4を回路のグランドに接続し、かつ圧電ケーブル4の端末を回路に接続する間を導電性材料9で覆い、この導電性材料9を回路グランドに接続してなる圧電ケーブル1の検知回路とし、静電気などの電気ノイズが、外側電極の金属箔及び端末を覆った導電性材料に吸収され、回路グランドに逃れ、中心電極の信号への静電気等の電気ノイズの影響が少なくなる。 【選択図】図1
PROBLEM TO BE SOLVED: To provide a detection circuit of a piezoelectric cable which is a circuit strong against electric noises such as static electricity even if the length of the piezoelectric cable becomes long, as detection is performed by increasing amplification rate of the circuit since voltage generated becomes smaller, the longer the length of the piezoelectric cable becomes. SOLUTION: The detection circuit of a piezoelectric cable 1 is constructed by covering an external electrode 4 of the piezoelectric cable 6 generating electric charges with a metal foil, connecting the external electrode 4 of the metal foil to a ground of a circuit, covering the spacing connecting the terminal of the piezoelectric cable 4 to the circuit with a conductive material 9, and connecting the conductive material 9 to the circuit ground. Electric noises such as static electricity are absorbed to the conductive material covering the metal foil and the terminal of the external electrode, and guided to the circuit ground, and effect of the electric noises such as static electricity or the like to the signal of a center electrode becomes less. COPYRIGHT: (C)2008,JPO&INPIT

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