| 摘要 |
PURPOSE:To broad a peak wavelength range of natural oscillation, by forming an tightly enclosed space between a macromolecular piezoelectric element and a base body, in case when the macromolecular piezoelectric element and the base body are firmly stuck to each other. CONSTITUTION:A macromolecular piezoelectric element 1 consisting of a polyfluorovinylidene film in the form of a sheet, which is provided with electrodes 2, 2' of Ni, Al, etc. on both the sides is made to firmly adhere to the base body 3 of metal, plastic, etc. by use of an adhesive agent 4. Also, an air gap 5 is formed on the back of the macromolecular piezoelectric element 1. This air gap 5 forms an tightly enclosed space so that water does not enter in when the has been dipped in a liquid. |
