JP4113891B2 - 静電容量型検出装置 - Google Patents
静電容量型検出装置 Download PDFInfo
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- JP4113891B2 JP4113891B2 JP2005366114A JP2005366114A JP4113891B2 JP 4113891 B2 JP4113891 B2 JP 4113891B2 JP 2005366114 A JP2005366114 A JP 2005366114A JP 2005366114 A JP2005366114 A JP 2005366114A JP 4113891 B2 JP4113891 B2 JP 4113891B2
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Description
図1及び図2において、1は静電容量型検出装置の検出器であって、回路基板2、検出電極3、第二電極4、第三電極5、及びこれらを内蔵するプラスチックケース6から構成されている。
図1に示すように、検出電極3は、矩形波電圧発生回路16の互いに逆位相の矩形波電圧を出力する2つの出力端子16a,16bの内の一方の出力端子16aに抵抗器17を介して接続されるとともに、位相反転/波形整形回路18の入力端子18aに接続されている。
矩形波電圧発生回路16の一方の出力端子16aからは、図4−行Aに示す矩形波電圧が抵抗器17を介して検出電極3に印加される。また、矩形波電圧発生回路16の他方の出力端子16bからは、図4−行Bに示すように前記検出電極3に印加される矩形波電圧(図4−行A)に対し180度位相が異なった同周波数の矩形波電圧が出力され、これが可変抵抗器20を経由することにより、図4−行Dに示すように立ち上がり立ち下がりに若干の時間を要した状態で、位相反転/波形整形回路19の入力端子19aに供給される。従って、当該位相反転/波形整形回路19の出力端子19b(比較回路21の入力端子21a)での矩形波電圧の波形は、図4−行Fに示すように、位相が180度反転されて、図4−行Aに示す矩形波電圧発生回路16の出力端子16aの出力波形(検出電極3に印加される矩形波電圧の波形)と略同位相になるが、当該図4−行Aに示す矩形波電圧よりも立ち上がり立ち下がりが時間tだけ遅れた矩形波となる。
容器27の内面に汚れとなる誘電体層2が存在する場合には、検出電極3に矩形波電圧が印加されると、検出電極3と接地された第二電極4とが誘電体層28を介して高周波的に結合することにより、抵抗17と誘電体層28を経由して高周波電流が流れる。このため、図4−列(2)行Cに示すように、位相反転/波形整形回路18の入力端子18aにおける矩形波電圧(検出電極3における矩形波電圧)は、その立ち上がり立ち下がり時に、先に説明した可変抵抗器20による遅れ時間tよりも大きな時間Tの遅れが発生する。
上記の実施の形態1では、容器27の囲壁27aの内面などに形成される汚れや濡れなどの誘電体層28の有無を検出できるようにしているが、この実施の形態2では、誘電体層28の有無だけでなく、その厚さの程度(汚れの程度)を判別することができるようにしたものである。
2 回路基板
3 検出電極
4 第二電極
5 第三電極
6 プラスチックケース
7 第二基板
8 スペーサー兼用のピンコネクター
9 第三基板
16 矩形波電圧発生回路(ガード電圧発生手段)
17 抵抗器
18 位相反転/波形整形回路
19 位相反転/波形整形回路
20 可変抵抗器(ガード電圧発生手段)
21 比較回路
22 オンオフ信号発生回路
23 出力回路
24 位相反転/波形整形回路
27 容器
27a 非導電性材料から成る囲壁
28 汚れなどの誘電体層
30 ガード電圧発生手段
31 接地端子
33 切り換え手段
Claims (2)
- 非導電性の隔壁に汚れとして付着した誘電体層に対して当該隔壁を隔てて配設された検出電極に抵抗を介して矩形波電圧を印加し、前記抵抗と誘電体層とを経由して対地間で高周波電流が流れる際の対地間で生じる静電容量とによって形成されるRC回路による前記検出電極での立ち上がり立ち下がりの時間遅れに基づいて検出信号を出力するようにした静電容量型検出装置であって、前記検出電極に印加される矩形波電圧と同周波数の矩形波電圧を発生するガード電圧発生手段と、前記検出電極の周囲に配設された第二電極と、前記検出電極の背面側をカバーするように配設された第三電極とを備え、前記第二電極及び第三電極の両方が共に接地されていることを特徴とする静電容量型検出装置。
- 請求項1記載の静電容量型検出装置において、前記第二電極及び第三電極の両方が接地された第一状態から第二電極及び第三電極の両方が前記ガード電圧発生手段に接続された第二状態に切り換える切り換え手段を備えることを特徴とする静電容量型検出装置。
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JP2005366114A JP4113891B2 (ja) | 2005-12-20 | 2005-12-20 | 静電容量型検出装置 |
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JP13073099A Division JP3772044B2 (ja) | 1999-05-12 | 1999-05-12 | 静電容量型検出装置 |
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JP2006106008A JP2006106008A (ja) | 2006-04-20 |
JP4113891B2 true JP4113891B2 (ja) | 2008-07-09 |
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JP2005366114A Expired - Lifetime JP4113891B2 (ja) | 2005-12-20 | 2005-12-20 | 静電容量型検出装置 |
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