| 摘要 |
PURPOSE:To avoid to worsen characteristics by the column-shaped piezoelectric body ranging to a clearance between electrodes by making smaller the width of a piezoelectric body while comparing said width with the clearance of a divided signal electrode, in the ultrasonic probe plurally divided. CONSTITUTION:Multiple ring electrode 303, 304 and 305 are composed of a compound piezoelectric body for which the element width 302 of a column- shaped piezoelectric body 301 is sufficiently made small. By using the compound piezoelectric body for which the length 307 of a diagonal line for the element is the same as distance 308 and 309 or below between electrodes, two electrodes are not simultaneously formed for one column-shaped piezoelectric body and an electrode pattern close to a prescribed electrode shape can be formed. The finer the element width 302 becomes, the closer the prescribed electrode shape becomes and it becomes hard to make the compound piezoelectric body. Consequently, what compound piezoelectric body should be used is determined by the balance between them. |
