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JPS5756099

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DESCRIPTION JPS5756099
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
ultrasonic ceramic microphone, FIG. 2 is a plan view showing an embodiment of the ultrasonic
ceramic microphone according to the present invention, and FIG. It is the figure which compared
the frequency characteristic of the conventional product. 5 · · · Piezoelectric ceramic vibrator, 6 · ·
· frusto-conical case, 6 a · · · bottom surface, 7 · · · terminal plate, 9 · · · elastic adhesive.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
ceramic microphone which is used outdoors and enables application to a rear sensing device of a
motor vehicle. A conventional microphone of this type will be described with reference to FIG. As
shown in the figure, the piezoelectric ceramic vibrator 1 is bonded to the inner side of the bottom
of the cylindrical case 2 to form a vibration -7 part, and the case 2 has a thickness of the
vibrating part to reduce influence by side support. Is thinner than the thickness of the side. A
terminal plate 3 has a structure in which an opening of the case 2 is attached via an elastic
adhesive 4 to the side opening 2. In this case, since the case has a cylindrical shape and the side
thickness is thicker than the thickness of the vibrating portion, the substantial mass of the
vibrating portion is increased and the Q of the vibration is increased. Therefore, there is a
drawback that the Q of acoustic resonance is also high and the band is narrow. Furthermore,
since the case shape is not configured to have a constant thickness, there is a drawback that the
processing cost is high. The present invention ameliorates the disadvantages of the prior art, and
aims to provide an ultrasonic ceramic microphone with a high sensitivity and wide band closed
structure. One embodiment of the present invention will be described with reference to FIG. The
piezoelectric ceramic vibrator 6 is bonded to the bottom surface 6 'of the truncated conical case
6 to form a vibrating portion. A terminal plate 7 is attached to the other end of the truncated
cone-shaped case 6 via an elastic ring 8 and an elastic adhesive 9. 1o and 1σ are connected by
lead wires to the electrode surface of the piezoelectric ceramic vibrator 6 and the inner side
surface of the truncated cone shape case 6, and the other end is connected to the terminal 11.11
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'. The lead wires 10 and 10 'input and output electric signals through the terminals 11.11', but
the lead wires 10 and 1σ may be used directly for external input and output. In this case, the
shape of the terminal plate 7 needs to be easy to attach to the set. As described above, according
to the present invention, by setting the frusto-conical case 6, the side portion is perpendicular to
the vibration surface as in the cylindrical case, so that the vibration transmission to the side
portion is transmitted in the vertical direction. The vibration transmission to the side part of the
truncated cone shape case 6 approximates the vibration direction of the vibrating part and at the
same time has a certain inclination to the vibrating part, while the vibration damping is caused
and the resonance Q becomes high. The reaction force of the vibration does not decrease.
Because of this there is no vibration damping. Conversely, the vibration amplitude can be
increased by resonating with the side vibration. Also, by making the enjoyment of the side
portion of the case 6 and the vibrating portion p constant, the vibration to the side portion is
easily transmitted and the high sensitivity is easily obtained. There is attenuation.
For this reason, the front 42 frusto-conical case 6 is incorporated in connection with the terminal
plate 7 through the elastic adhesive network 9, and it can be supported by the terminal plate 7
and the terminals 11 and 11 '. Therefore, there is no characteristic change due to the support
means because the terminal plate 7 is supported without supporting the truncated cone-shaped
case 6 including the vibration part, and the vibration distortion caused by the shape variation of
the case 6 and the lead wires 10 and 10 ' Since it absorbs in the contact layer part, stable
acoustic characteristics are exhibited. As described above, the present invention can provide an
ultrasonic ceramic microphone exhibiting high sensitivity and wide band by setting a shape
having excellent upper air-machine-acoustic conversion efficiency as a truncated cone shape
case. FIG. 3 shows a comparison between the frequency characteristic a of the product of the
present invention and the frequency characteristic of the conventional product. Since the present
invention has a sealed structure, it can be applied to a set used outdoors, and at the same time,
the utility as a detection sensor for automobiles is expected to be large.
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