发明授权
- 专利标题: Capacitive sensing device
- 专利标题(中): 电容式感测装置
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申请号: US903096申请日: 1992-06-19
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公开(公告)号: US5291534A公开(公告)日: 1994-03-01
- 发明人: Shizuki Sakurai , Tomio Nagata , Shiro Kuwahara , Osamu Tabata , Susumu Sugiyama
- 申请人: Shizuki Sakurai , Tomio Nagata , Shiro Kuwahara , Osamu Tabata , Susumu Sugiyama
- 申请人地址: JPX Kariya JPX Aichi
- 专利权人: Toyoda Koki Kabushiki Kaisha,Kabushiki Kaisha Toyota Chuo Kenkyusho
- 当前专利权人: Toyoda Koki Kabushiki Kaisha,Kabushiki Kaisha Toyota Chuo Kenkyusho
- 当前专利权人地址: JPX Kariya JPX Aichi
- 优先权: JPX3-177328 19910622; JPX4-163744 19920529
- 主分类号: G01D3/036
- IPC分类号: G01D3/036 ; G01D5/241 ; G01L9/00 ; G01L9/12 ; G01P15/125 ; G01R27/26 ; G01L19/04
摘要:
A digital capacitive sensing device comprises: a reference capacitor having a reference capacitance unaffected by a force to be measured; a reference pulse signal generating circuit which generates a reference pulse signal of a frequency corresponding to the reference capacitance; a sensing capacitor having capacitance variable according to the magnitude of the force; a measuring pulse signal generating circuit having a construction similar to that of the reference pulse signal generating circuit and capable of generating a measuring pulse signal of a frequency corresponding to the capacitance of the sensing capacitor; and a differential arithmetic circuit which adds the number of pulses of the reference pulse signal in a predetermined time interval to a set value and subtracts the number of pulses of the measuring pulse signal in a predetermined time interval from the set value. The reference pulse signal generating circuit is capable of compensating a zero point temperature characteristic of a detection value, and the measuring pulse signal generating circuit is capable of compensating a detection sensitivity temperature characteristic.
公开/授权文献
- US5903814A Flux cored wires for gas shielded arc welding 公开/授权日:1999-05-11
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