Patent ID: 8148881

Claim:
A vibration sensor film comprising: a piezoelectric polymer film of a plate form; and at least one pair of first sensor electrodes formed on the piezoelectric polymer film into a pattern based on a first particular mode of vibration, one of the first sensor electrodes in the pair being disposed on one surface of the piezoelectric polymer film, the other one of the first sensor electrodes in the pair being disposed on the other surface of the piezoelectric polymer film, the pair of the first sensor electrodes for outputting a signal when the first particular mode of vibration is applied to the piezoelectric polymer film, and wherein a pair of second sensor electrodes are formed on the piezoelectric polymer film into a pattern based on a second particular mode of vibration, one of the second sensor electrodes in the pair is disposed on one surface of the piezoelectric polymer film, and the other one of the second sensor electrodes in the pair is disposed on the other surface of the piezoelectric polymer film.