Driving circuit of electrostrictive converter

Abstract

Abstract PURPOSE:To prevent the deterioration of the deflecting characteristics for the element by combining a pair of electrostrictive elements with the polarizing directions set opposite to each other, earthing the side electrode of one side with the AC voltage applied to the other side and connecting the diode between the center electrode and the side electrode. CONSTITUTION:Ceramic element 3 and 5 are adhered on the surface of electrode 2b and 4b with their polarizing directions set opposite to each other, and one end is fixed to suport part 8 of the rotary head drum with electrode 4a earthed. And video head 6 is attached to the other end of electrode 4a. Then the AC driving voltage sent from signal source 9 is supplied to electrode 2a via slip ring 10, and thus bimorph plate 1 is deflected. Diode 15a and 15b are provided between electrode 2b/4b and source 6 plus the earth. With installation of these diodes, only the driving voltage in the polarizing direction is supplied alternately to a pair of electrostrictive elements substantially, thus reducing the electrostrictive elements. As a result, the deterioration can be avoided for the deflection characteristics.

Inventors

• 👤 Hitoshi Sakamoto

Bibliographic Details