| 摘要 |
PURPOSE:To raise the safety, and also to reduce an unnecessary acoustic reflection by laminating successively a flexible printed circuit board and a packing member, on one surface of a vibrator group formed by arranging plural vibrator elements. CONSTITUTION:A vibrator group 109 on which may vibrator elements have been arranged two-dimensionally is stuck temporarily to a base 206, an electrode which as been arranged in a shape of a two-dimensional array in the center part of a flexible printed circuit board 201 for inserting and holding a lead wire 204 is positioned and superposed between said group and a soft insulating film 208, and by melting a solder layer 220, each vibrator 109 and the electrode 202 are soldered. A packing material 209 is stuck to the surface of the circuit board 201, the peripheral part of the circuit board 201 is stuck to the side face of the packing member, and the base 206 is peeled off. In the periphery of the vibrator group 109, an auxiliary member 210 consisting of an epoxy resin is formed, an earth electrode 211 is formed by a vapor deposition, etc., a lead wire 212 is connected, and an acoustic matching layer 213 is formed on the surface.
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