发明公开
EP0398728A2 Ceramic resonance type electrostatic sensor apparatus
失效
Keramisches共鸣器Elektrostatikfühlergerät。
- 专利标题： Ceramic resonance type electrostatic sensor apparatus
- 专利标题（中）： Keramisches共鸣器Elektrostatikfühlergerät。
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申请号： EP90305360.1申请日： 1990-05-17
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公开(公告)号： EP0398728A2公开(公告)日： 1990-11-22
- 发明人: Masuda, Noboru , Ohsawa, Tetsuo , Sugimura, Takashi
- 申请人： MURATA MANUFACTURING CO., LTD.
- 申请人地址： 2-26-10, Tenjin Nagaokakyo-shi,Kyoto JP
- 专利权人： MURATA MANUFACTURING CO., LTD.
- 当前专利权人： MURATA MANUFACTURING CO., LTD.
- 当前专利权人地址： 2-26-10, Tenjin Nagaokakyo-shi,Kyoto JP
- 代理机构： McNeight, David Leslie
- 优先权： JP126234/89 19890519; JP207216/89 19890810; JP261756/89 19891006; JP269829/89 19891017
- 主分类号： G01V3/08
- IPC分类号： G01V3/08
摘要：
There is disclosed a ceramic resonance type electrostatic sensor apparatus comprising an oscillator (1) including a ceramic resonator (1A); a detecting unit (A) for detecting capacitance between said detecting unit (A) and an object to be detected; and a resonating circuit (2) including a ceramic resonator (21) having a tuning point which varies with a small change in capacitance detected by said detecting unit (A) characterised in that high-impedance circuits (6,A1,A2) are respectively connected to input and output stages of said ceramic resonator (21) of said resonating circuit (2).
公开/授权文献
- EP0398728B1 Ceramic resonance type electrostatic sensor apparatus 公开/授权日：1994-07-13
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