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JPS61185000

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DESCRIPTION JPS61185000
[0001]
INDUSTRIAL APPLICABILITY The present invention is applied to a bar young meter, an
automobile rear detector, a distance meter, etc., and is an ultrasonic ceramic microphone for
transmitting and receiving ultrasonic waves. 1′! jるものである。 Prior Art A conventional
ultrasonic ceramic microphone of this type will be described with reference to FIG. First, 1 is a
piezoelectric device. The piezoelectric ceramic plate 1 is bonded to the inner side surface of the
bottom portion 2a of the cylindrical case 2 having a truncated cone shape in cross section to
constitute a bimorph oscillator. A resonant ring 3 is fixed to the inner side surface of the
cylindrical case 2. A terminal plate 4 is inserted into the cylindrical case 2 by pressure bonding
the spacer 5 made of an elastic member to the same as the resonance ring 3. An elastic adhesive
6 for fixing the terminal plate 4 is injected so as to seal the terminal plate 4 and the cylindrical
case 2IIl. Reference numeral 7a denotes a lead wire (one end is soldered to the external entering
and leaving car 8a embedded in the terminal plate 4 and the other end is a conductive adhesive 9
on the contact surface of the cylindrical case 2 and the resonance ring 3 It is glued through. Lead
wire 7b is pressed! It is connected by soldering to the electrode surface of the ceramic plate 1
and the external input / output terminal 8 b implanted in the terminal plate 4. In each soldering,
the elastic adhesive 6 is also filled in the part. According to the prior art, one end of the lead wire
7a is bonded to the contact surface of the cylindrical case 2 and the resonance ring 3 via the
conductive adhesive 9, and the other of the lead 1a 7a The end is soldered to the terminal 8a, but
there is variation in the conduction resistance of the conductive adhesive 9 itself, and since the
cylindrical case 2 and the resonance ring 3 are made of aluminum, An oxide film is formed, this
g! There is a problem that the conduction resistance between the cylindrical case 2 and the ring
wire 7a increases and the variation also increases. Furthermore, since the lead wire 7a is a soft
wire, when holding the lead 17a on the contact surface of the cylindrical case 2 and the
resonance ring 3, the variation in the distance between the lead wire 7a and the inner side
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surface of the cylindrical case 2 becomes large. This also causes the conduction resistance
between the lead wire 7a and the cylindrical case 211g to increase. For this reason, when the
voltage applied to the terminals 8a and 8b, the current is small, the voltage generated from the
pressure f'1ill plate 1, the current is small, the lead l17a and the cylindrical case 2rM When the
resistance is large, a voltage is generated in the lead wire 7a and the cylindrical case 2gA, and the
terminal Qa. There is a problem that the voltage of 8blll and the pressure ffi porcelain plate 1 is
lowered to cause a significant decrease in sensitivity.
Therefore, the object of the present invention is to reduce the conduction resistance between the
external input / output terminal and the pressure Ti ceramic plate and to reduce the variation
thereof so that good sensitivity characteristics can be obtained. Means for Solving the Problems
In order to solve the above problems, the present invention uses a metal foil in which a fine lead
end is integrally formed on the inner surface of the bottom of a cylindrical case having a
truncated cone shape in cross section. Bonding and bonding a piezoelectric ceramic plate to the
metal foil to form a bimorph oscillator, and bonding the metal foil end directly to an external
input / output terminal. Since the metal foil is adhered to the lower electrode of the piezoelectric
ceramic plate, the lower electric machine of the piezoelectric ceramic plate and the metal foil are
electrically connected, and the lead end of the metal foil is formed long. Since it is directly
connected to the external input / output terminal, the conduction resistance between the external
input / output terminal and the piezoelectric ceramic plate can be extremely small, and the
variation of the conduction resistance is also eliminated. Therefore, stable sensitivity
characteristics can be obtained. Embodiment Hereinafter, an embodiment of the present
invention will be described with reference to FIGS. 1 and 2. FIG. A metal foil 10 integrally formed
with an elongated lead end 10a is bonded to the inner surface of a bottom portion 2a of a
cylindrical case 2 having a truncated cone shape in cross section, and a pressure plate 1 is
bonded to the metal foil 10 Constitute a bimorph oscillator. The resonance ring 3 is fixed to the
inner side surface of the cylindrical case 2. A terminal plate 4 is inserted into the cylindrical case
2 by pressure bonding a spacer 5 made of an elastic member with the resonance ring 3. An
elastic adhesive 6 for fixing the terminal plate 4 is injected so as to seal the terminal plate 4 and
the cylindrical case 2B. A lead wire 7 is connected by soldering to the upper electrode surface of
the pressure W 1 ceramic plate 1 and the external input / output terminal 8 b embedded in the
terminal plate 4. The lead end 10a of the metal foil 1o formed through a gap between the
cylindrical case 2 and the resonance ring 3 is directly connected by soldering to the external
input / output terminal 8a embedded in the terminal plate 4 ing. According to the above
configuration, since the lower surface electrode of the piezoelectric ceramic plate 1 and the
terminal 8a are connected via the metal foil 10, the conduction resistance between the terminal
8a and the piezoelectric ceramic plate 1 @ can be extremely small, and There is no variation.
Thus, stable sensitivity characteristics can be obtained. As described above, according to the
present invention, since the lower surface electrode of the pressure Ti ceramic plate and the
external input / output terminal are connected through the metal foil, the conduction resistance
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between the terminal and the pressure ffi magnetic plate is It can be made extremely small and
there is no variation in conduction resistance, and stable electrical coupling can be obtained.
Therefore, stable sensitivity characteristics can be obtained, and a highly reliable ultrasonic
ceramic microphone can be provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view of an ultrasonic ceramic microphone according to an embodiment of the
present invention, FIG. 2 is a perspective view of a metal foil in FIG. 1, and FIG. 3 is a sectional
view of an ultrasonic ceramic microphone of the prior art.
DESCRIPTION OF SYMBOLS 1 ... Piezoelectric ceramic board, 2 ... Tubular case, 2a ... Bottom part,
8a ... External input-output terminal, 10 ... Metal foil, 10a ... Lead end agent Masaru Morimoto
Hiro 1 figure
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