Patent ID: 7703341

Claim:
A pressure detecting apparatus utilizing electromagnetic coupling comprising: a sensor section including first coils, second coils provided such that each center axis of the second coils are superimposed with each center axis of 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 each center axis of the third coils are superimposed with each center axis of 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, at least one of the first, second and third coils being bent by receiving pressure, 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.