发明授权
US5291152A Proximity switch having oscillator inductively coupled through pulsed
Faraday shield to resonant target
失效
接近开关具有通过脉冲法拉第屏蔽电感耦合到谐振靶的振荡器
- 专利标题: Proximity switch having oscillator inductively coupled through pulsed Faraday shield to resonant target
- 专利标题(中): 接近开关具有通过脉冲法拉第屏蔽电感耦合到谐振靶的振荡器
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申请号: US969312申请日: 1993-02-16
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公开(公告)号: US5291152A公开(公告)日: 1994-03-01
- 发明人: Allen Seale
- 申请人: Allen Seale
- 申请人地址: GBX Christchurch
- 专利权人: Vaseal Electronics Limited
- 当前专利权人: Vaseal Electronics Limited
- 当前专利权人地址: GBX Christchurch
- 优先权: GBX9017910 19900815
- 主分类号: G06K7/08
- IPC分类号: G06K7/08 ; H03K17/95
摘要:
An inductive type proximity switch (S) includes an open-ended loop (L3) adjacent to the inductor (L1, L2) of the parallel resonant circuit of its main (LC) oscillator. A high speed bistate switch (S1) is connected between the ends of the loop (L3). A pulsed input to the switch (S1) causes sequential making and breaking of a connection between the ends of the loop (L3) whereby the loop (L3) functions as a Faraday shield to inhibit mutual inductive linking of the inductor (L1, L2) with an inductor (L4) of a passive (LC) resonant circuit (L4, C4) of a target (T) when the target (T) is in proximity with the proximity switch (S) and the connection between the ends of the loop (L3) is made by the bistate switch (S1).
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