ELECTROACOUSTIC CONVERTER

摘要

An electroacoustic converter includes a piezoelectric film whose principal surface expands and contracts according to an electric field, a viscoelastic support which is in close contact with the principal surface of the piezoelectric film, a pressing member which presses the piezoelectric film to the viscoelastic support, and an expandable pressing sheet which is tensioned and in close contact with the surface of the piezoelectric film opposite to the viscoelastic support to press the piezoelectric film and the viscoelastic support. In a section in a predetermined direction perpendicular to the principal surface of the piezoelectric film, the piezoelectric film has a flat portion which is held by the pressing sheet and the viscoelastic support in a portion thereof excluding a pressed portion by the pressing member, and an inclined portion which is connected to the pressed portion and the flat portion and extends in a direction of intersecting the pressed portion. With this, an electroacoustic converter having excellent acoustic characteristics and stab resistance is provided.

主权项

1. An electroacoustic converter comprising:
a piezoelectric film which has two principal surfaces facing each other, the principal surfaces expanding and contracting according to the state of an electric field; a viscoelastic support which is disposed in close contact with one principal surface of the piezoelectric film; a pressing member which presses the piezoelectric film to the viscoelastic support to maintain the thickness of at least a part of the viscoelastic support in a thinned state; and an expandable pressing sheet which is in close contact with the principal surface of the piezoelectric film opposite to the side in close contact with the viscoelastic support to press the piezoelectric film and the viscoelastic support and is supported in a tensioned state, wherein, in a section in a predetermined direction perpendicular to the principal surfaces of the piezoelectric film, the piezoelectric film has a flat portion which is substantially held linearly by the surfaces of the pressing sheet and the viscoelastic support in at least a portion thereof excluding the pressed portion pressed by the pressing member and an inclined portion which is connected to the pressed portion and the flat portion and extends in a direction of intersecting the pressed portion.