Piezo-electric transducer unit
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Jul 3, 1997
filing date -
Nov 8, 1995
priority date (Note) -
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Abstract
An insulating substrate (1) is a laminate of a first insulating substrate (1a) and a second insulating substrate (1b) on which wires and electrodes are formed previously. In this case a concavity is formed on the insulating substrate (1) by a hollow part (4) of the first insulating substrate (1a) and an upper surface of the second insulating substrate. Metallic wires are also arranged on an area corresponding to a bottom surface of the concavity of the second insulating substrate. As a result, space for arranging metallic wires expands and a space between metallic wires can be widened. Further, metallic wires which bypass areas corresponding to external electrodes formed on a lower surface of the second insulating substrate can be formed. This results in smaller stray capacitance between an electrode and a wire and between wires.
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