| 摘要 |
PURPOSE:To prevent not only erroneous wiring but also the change in the resonance frequency of a sensor due to a lead wire, by arranging a multilayered printed circuit board, which has the conductive patterns connected to piezoelectric bodies, to a vibrator having a large number of piezoelectric bodies. CONSTITUTION:An acoustic matching layer 12 having the function of a common electrode is formed to the single surface of a piezoelectric aggregate 1 and a multilayered printed circuit board 2 having conductive patterns 3 is adhered to the opposite surface thereof in a conductive state. After the printed circuit board 2 is adhered to the aggregate 1, a packing material 4 is adhered to hold the printed circuit board 2 and a signal processing circuit substrate 5 is connected to the flexible printed circuit board 2a continued to the printed circuit board 2 in matching relation to the patterns 3 by a method wherein soldering is preliminarily applied to the patterns 3 of the printed circuit board 2 and the substrate 5 is aligned with electrode patterns 6 and subsequently heated from the side of the printed circuit board 2a using a hot plate to be adhered to the printed circuit board 2 by soldering. By this method, erroneous wiring can be prevented certainly and the change in the resonance frequency of a sensor due to a lead wire can be prevented.
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