| 摘要 |
<p>PURPOSE: To improve a S/N ratio by a method, wherein one of two conductive armatures is connected to the inside of a sensitive element of a coaxial structure, and the other is coupled to the outside thereof, and also they are united integrally by a cover material. CONSTITUTION: Two coaxial sensitive elements 1, 2 comprise an electrode or an internal armature 3 constituted by a metal wire buried in a cylindrical flexible body having piezoelectric characteristic, for example, and an external armature 5 is fitted on the external face of the cylinder. Further, one of the external armatures 5 is electrically coupled to the other internal armature 3, and vice versa. Each pair of armatures 3, 5 coupled is connected to the same terminal of an adapter preamplifier 6, and both the sensitive elements 1, 2 are juxtaposed and integrally united by an insulating armoring 7 of elastomer which transmits sound waves. Thereby, a S/N ratio can be improved.</p> |
