Piezoelectric film
An object of the present invention is to provide a cut sheet-like piezoelectric film which includes electrode layers on both surfaces of a piezoelectric layer and is capable of preventing a short circuit of the electrode layers. The object is achieved by providing a cut sheet-like piezoelectric film including a piezoelectric layer which contains piezoelectric particles in a matrix containing a polymer material, and electrode layers which are provided on both surfaces of the piezoelectric layer, in which a distance between the electrode layers at an end portion in a thickness direction is 40% or greater with respect to a thickness of the piezoelectric layer.
1. A cut sheet-like piezoelectric film comprising:
a piezoelectric layer which contains piezoelectric particles in a matrix containing a polymer material; and
electrode layers which are provided on both surfaces of the piezoelectric layer,
wherein at an end portion, which comprises a cut surface of the cut sheet-like piezoelectric film and is plastically deformed due to cutting, a distance between the electrode layers in a thickness direction is 40% or greater with respect to a thickness of the piezoelectric layer.
2. The piezoelectric film according to claim 1 , further comprising:
a protective layer which covers at least one electrode layer.
3. The piezoelectric film according to claim 1 ,
wherein the distance between the electrode layers at the end portion in the thickness direction is 95% or less with respect to the thickness of the piezoelectric layer.
4. The piezoelectric film according to claim 1 ,
wherein the polymer material contains a cyanoethyl group.
5. The piezoelectric film according to claim 4 ,
wherein the polymer material is cyanoethylated polyvinyl alcohol.
6. The piezoelectric film according to claim 2 ,
wherein the distance between the electrode layers at the end portion in the thickness direction is 95% or less with respect to the thickness of the piezoelectric layer.
7. The piezoelectric film according to claim 2 ,
wherein the polymer material contains a cyanoethyl group.
8. The piezoelectric film according to claim 3 ,
wherein the polymer material contains a cyanoethyl group.