PIEZOELECTRIC TRANSFORMER

• Main Authors: KISHI DAIKI, IZUMI KOTA, KINOSHITA SARINA, YANAGIYA TAKAHIKO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2021
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

To provide a piezoelectric transformer suitable for mass production.SOLUTION: A piezoelectric transformer 10 includes: an input-side piezoelectric film 11 formed of a first piezoelectric material, having a first thickness d1, and having a polarization oriented to a predetermined first direction; an output-side laminate 12 in which an output-side piezoelectric film 121 provided adjacent to the input-side piezoelectric film 11, formed of a second piezoelectric material, having a second thickness d2, and having a polarization oriented to a predetermined second direction and a non-piezoelectric film 122 having a non-piezoelectric property and having a third thickness d3 are alternately stacked a plurality of times, in which sonic velocity v1 in the input-side piezoelectric film 11, sonic velocity v2 in the output-side piezoelectric film 121, and sonic velocity v3 in the non-piezoelectric film 122 satisfy the relations of 0.5×(v2/v1)d1≤d2≤2.0×(v2/v1)d1 and 0.5×(v3/v1)d1≤d3≤2.0×(v3/v1)d1; a pair of input electrodes provided on both surfaces of the input-side piezoelectric film 11 (first input electrode 131 and second input electrode 132); and a pair of output electrodes provided on both surfaces of the output-side laminate 12 (first output electrode 141 and second output electrode 142).SELECTED DRAWING: Figure 1 【課題】量産に適した圧電トランスを提供する。【解決手段】圧電トランス１０は、第１の圧電材料製であって第１の厚さd1を有し分極が所定の第１方向を向いている入力側圧電膜１１と、入力側圧電膜１１に隣接して設けられた、第２の圧電材料製であって第２の厚さd2を有し分極が所定の第２方向を向いている出力側圧電膜１２１と、非圧電性であって第３の厚さd3を有する非圧電膜１２２とを交互に複数回積層した積層体であって、入力側圧電膜１１内の音速v1、出力側圧電膜１２１内の音速v2、及び非圧電膜１２２内の音速v3を用いて表される0.5×(v2/v1)d1≦d2≦2.0×(v2/v1)d1及び0.5×(v3/v1)d1≦d3≦2.0×(v3/v1)d1の関係を有する出力側積層体１２と、入力側圧電膜１１の両面に設けられた1対の入力電極（第１入力電極１３１及び第２入力電極１３２）と、出力側積層体１２の両面に設けられた1対の出力電極（第１出力電極１４１及び第２出力電極１４２）とを備える。【選択図】図１