Pressure Detecting Apparatus Utilizing Electromagnetic Coupling
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Abstract
The object of the present invention is to provide a pressure detecting apparatus that is less affected from noises and can be constructed in a large size. The pressure detecting apparatus according to the present invention utilizes electromagnetic coupling. The sensor section comprises first coils 1, second coils 2 provided on the first coils such that they are superimposed to each other, and a first cushion member 3 provided between the first coils and the second coils. A drive circuit for driving either of the first coils and the second coils and a detection circuit for detecting pressure applied against the sensor section on the basis of signals resulting from electromagnetic coupling from the other of the first coils and the second coils are connected to the sensor section. The sensor sections are disposed in a matrix state so that measurements of pressure distribution can be effected.
19 Citations
27 Claims
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1-14. -14. (canceled)
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15. A pressure detecting apparatus utilizing electromagnetic coupling comprising:
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a sensor section including first coils, second coils provided such that they are superimposed with the first coils, a first cushion member provided between the first and second coils, third coils provided at a position where the second coils oppose to the first coils such that the third coils are superimposed with the second coils, and a second cushion member provided between the second coils and the third coils and having a modulus of elasticity which is different from that of the first cushion member, a drive circuit for driving either of the first coils and the second coils, and a detection circuit for detecting pressure to be applied against the sensor section based on signals resulting from electromagnetic coupling from the other of the first coils and the second coils. - View Dependent Claims (16, 17, 18, 19, 21, 22, 24, 25, 26, 27)
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20. A pressure detecting apparatus utilizing electromagnetic coupling comprising:
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a sensor section including first coils, second coils provided such that they are superimposed with the first coils, and a first cushion member provided between the first and second coils, a drive circuit for driving either of the first coils and the second coils, and a detection circuit for detecting pressure to be applied against the sensor section based on signals resulting from electromagnetic coupling from the other of the first coils and the second coils, wherein the apparatus is constructed so that it can measure the pressure distribution by disposing a plurality of the sensor sections in a matrix state, forming the first coils into a plurality of coil rows connected in series in the direction of the X-axis, respectively, and forming the second coils into a plurality of coil rows connected in series in the direction of the Y-axis, respectively.
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23. The pressure detecting apparatus as defined in 19 or 20, characterized in that one end of the respective coil rows is grounded and the other end thereof is connected with the drive circuit or the detection circuit, the drive circuit includes a plurality of current drivers for driving each of the plurality of coil rows to be driven with different wave forms, and the detection circuit includes a plurality of current amplifiers for receiving signals from each of the plurality of coil rows and a plurality of synchronous detection sections for separating the respective wave forms.
Specification