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JP2000188800

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DESCRIPTION JP2000188800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transmission / reception integrated drip-proof ultrasonic microphone.
[0002]
2. Description of the Related Art A conventional drip-proof ultrasonic microphone is one that
generates a voltage by inputting a tone burst wave to a piezoelectric ceramic 2 at a fixed or
arbitrary period to generate a voltage, and both transmission and reception are performed. It is
possible. 16 to 17 show the configuration of a conventional drip-proof ultrasonic microphone. A
disc-shaped piezoelectric ceramic 2 is fixed to the inner surface of the bottom of the bottomed
cylindrical vibration case 1 with an adhesive. The vibration case 1 is formed of an aluminum
material, and serves as one of the conductors when the piezoelectric ceramic 2 is excited to
generate a voltage. The piezoelectric ceramic 2 is a PZT-based ceramic, and the plus lead 13 is
connected to the outer peripheral end of the upper surface thereof by solder. The ring-shaped
ring silicon 4 is formed of an elastic body and is fixed to the inner circumferential surface 1 b of
the straight pipe portion 1 a of the vibration case 1 to prevent excitation of the straight pipe
portion 1 a of the vibration case 1. A sound absorbing felt 5 is disposed on the upper portion of
the ring silicon 4 so as to cover the upper surface of the piezoelectric ceramic 2 and functions to
absorb and attenuate the sound wave generated inside the vibration case 1. A lining silicone 6
made of an elastic material having low initial fluidity is disposed on the upper portion of the
sound absorbing felt 5 to prevent the flow of a low fluidity sealing silicon 11 described later into
the void portion of the sound absorbing felt 5. . The printed circuit board 7 is closely held on the
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upper surface of the lining silicon 6, and the pattern is disposed on the upper surface, and the
negative lead 9 is horizontally provided on the upper surface of the printed circuit board 7 on the
opposite side of the plus lead 13 It is done. Then, the upper end of the silicone 6 is broken at the
end opposite to the side where the plus lead 13 protrudes, and the defect portion 6 a is filled
with the conductive adhesive 8 to receive the vibration case 1 and the minus lead 9. In addition
to holding, the vibration case 1 and the negative lead 9 are conducted. The positive lead 13 and
the negative lead 9 and the connector cable 10 are soldered to the lands of the pattern to ensure
continuity between the positive side of the positive lead 13 and the connector cable 10 and the
negative side of the negative lead 9 and the connector cable 10. ing. The sealing silicon 11 is
filled from the upper surface of the printed circuit board 7 to the open rear end portion 1c of the
vibration case 1 to prevent the entry of foreign matter into the inside of the microphone.
[0003]
SUMMARY OF THE INVENTION The above-described drip-proof ultrasonic microphone causes
the following problems when it is used for a vehicle peripheral warning sensor or the like. The
principle of the ultrasonic microphone will be described with reference to FIG.
[0004]
FIG. 18 (a) shows the waveform of the transmission applied voltage, and FIG. 18 (b) shows the
voltage waveform of the reception signal. T1 is a transmission time, which is a time during which
the ultrasonic microphone is excited by the transmission applied voltage. Also, T2 is the time
from the transmission to the absence of the reverberation, and the ultrasonic microphone is
vibrated by the transmission applied voltage to start the oscillation of the ultrasonic wave, and
then the applied voltage is shut off and the vibration of the ultrasonic microphone disappears It
is time to T3 is the reflection time, which is the time it takes for the ultrasound to be reflected
back from the object. The distance L to the symmetrical object is determined by the reflection
time T3, and when the ambient temperature is t (° C.), L can be obtained from L = (331 + 0.6 t)
T3 / 2 (m). From the above, when the time T2 from the transmission until the reverberation
disappears becomes long, the reflection time T3 can not be detected, and in particular, the short
distance of the reflection time T3 can not be measured.
[0005]
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In the conventional ultrasonic microphone, when the expansion and contraction in the radial
direction of the piezoelectric ceramic 2 is converted to longitudinal vibration by the vibration
case 1, the plus lead 13 is also excited at the same time, and as a result, the echo shown in FIG.
The time T2 until it disappears increases, and it becomes in the state where an object detection of
a short distance is impossible. For this reason, there is a problem that it uses an open type
ultrasonic microphone with little reverberation and no drip-proof structure, though it is likely to
be installed outdoors as an automatic door and parking sensor sensor element. .
[0006]
The present invention has been made in view of these circumstances, and the object of the
present invention is to provide a drip-proof type ultra-short detector capable of detecting a short
distance by preventing excitation of the plus lead which is the cause of increased reverberation
time. An acoustic microphone is provided.
[0007]
According to a first aspect of the present invention, there is provided a drip-proof type ultrasonic
microphone in which a disk-like piezoelectric ceramic 2 is disposed on the inner surface of a
bottom portion of a bottomed cylindrical vibration case 1. The lower surface of the piezoelectric
ceramic 2 is in contact with the vibration case 1, the lead 3 is erected on the upper surface of the
piezoelectric ceramic 2, and the outer peripheral portion of the piezoelectric ceramic 2 is fixed to
the inner peripheral surface 1 b of the vibration case 1. In the drip-proof ultrasonic microphone
which is surrounded by the ring silicon ring 4, the projecting portion 4 b in close contact with
the exposed portion 3 a of the lead 3 drawn from the piezoelectric ceramic 2 is continuous with
the inner circumferential surface 4 a of the ring silicon 4. It is characterized in that it is provided.
[0008]
Further, in the drip-proof ultrasonic microphone according to a second aspect of the present
invention, in addition to the configuration of the first aspect, a projecting portion closely
contacting the exposed portion 3a of the lead 3 and the solder 20 for fixing the lead 3 to the
piezoelectric ceramic 2 It is characterized in that 4b is continuously provided on the inner
circumferential surface 4a of the ring silicon 4.
[0009]
Further, in the invention according to claim 3 of the present invention, in addition to the
configuration of claim 1, the protruding portion 4b covering the entire periphery of the solder 20
for fixing the exposed portion 3a of the lead 3 and the lead 3 to the piezoelectric ceramic 2 It is
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characterized in that it is provided continuously on the inner circumferential surface 4 a of the
ring silicon 4.
[0010]
In the drip-proof ultrasonic microphone according to claim 4 of the present invention, the diskshaped piezoelectric ceramic 2 is disposed on the inner surface of the bottom of the bottomed
cylindrical vibration case 1, and the lower surface of the piezoelectric ceramic 2 is used as the
vibration case 1. In contact, the lead 3 is erected on the upper surface of the piezoelectric
ceramic 2, and the outer peripheral portion of the piezoelectric ceramic 2 is surrounded by the
ring silicon 4 formed of an elastic body fixed to the inner peripheral surface 1 b of the vibration
case 1 In the drip-proof ultrasonic microphone, the exposed portion 3a of the lead 3 protruding
upward from the piezoelectric ceramic 2 and the protruding portion 4b covering the outer
periphery of the solder 20 for fixing the lead 3 to the piezoelectric ceramic 2 are inside the ring
silicon. It has a diameter slightly larger than the diameter of the solder 20 for fixing the lead 3 to
the piezoelectric ceramic 2 with the lead 3 as the central axis and provided continuously to the
circumferential surface 4 a. A tubular opening 4c is provided, the exposed portion 3a of the lead
3 is inserted into the straight tubular opening 4c, and the solder 20 for fixing the lead 3 to the
piezoelectric ceramic 2 is inserted, and initial fluidity is provided in the straight tubular opening
4c. It is characterized in that the elastic body 14 is filled.
[0011]
In the drip-proof ultrasonic microphone according to claim 5 of the present invention, the diskshaped piezoelectric ceramic 2 is disposed on the inner surface of the bottom of the bottomed
cylindrical vibration case 1, and the lower surface of the piezoelectric ceramic 2 is used as the
vibration case 1. In contact, the lead 3 is erected on the upper surface of the piezoelectric
ceramic 2, and the outer peripheral portion of the piezoelectric ceramic 2 is surrounded by the
ring silicon 4 formed of an elastic body fixed to the inner peripheral surface 1 b of the vibration
case 1 In the drip-proof ultrasonic microphone, the exposed portion 3a of the lead 3 protruding
upward from the piezoelectric ceramic 2 and the protruding portion 4b covering the outer
periphery of the solder 20 for fixing the lead 3 to the piezoelectric ceramic 2 A straight tubular
opening 4d surrounding the solder 20 for fixing the lead 3 to the piezoelectric ceramic 2 is
provided continuously to the inner peripheral surface 4a and the projecting portion 4b is
provided on the upper portion thereof. A tapered opening 4e whose center axis is the lead 3 and
whose upper opening circle is larger than the lower opening is provided, and the straight tubular
opening 4d is fitted with the solder 20 for fixing the lead 3 to the piezoelectric ceramic 2 The
exposed portion 3a of the lead 3 is inserted through the tapered opening 4e, and the tapered
opening 4e is filled with an elastic body 14 having initial fluidity.
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[0012]
In the drip-proof ultrasonic microphone according to claim 6 of the present invention, the diskshaped piezoelectric ceramic 2 is disposed on the inner surface of the bottom of the bottomed
cylindrical vibration case 1, and the lower surface of the piezoelectric ceramic 2 is used as the
vibration case 1. A drip-proof ultrasonic microphone comprising a lead 3 erected on the upper
surface of the piezoelectric ceramic 2 and being in contact with the outer periphery of the
piezoelectric ceramic 2 surrounded by a ring-shaped ring silicon 4 fixed to the inner peripheral
surface 1b of the vibration case 1 In the above, the exposed portion 3a of the lead 3 protruding
upward from the piezoelectric ceramic 2 and the protruding portion 4b covering the outer
periphery of the solder 20 for fixing the lead 3 to the piezoelectric ceramic 2 are continuously
connected to the inner peripheral surface 4a of the ring silicon 4. The diameter of the lower
opening circle is slightly larger than the diameter of the outer circumference circle of the solder
20 for fixing the lead 3 to the piezoelectric ceramic 2 in the protruding portion 4b, and the
diameter of the lower opening circle is Part opening circle provided a large tapered opening 4f
than the lower opening yen, it is characterized in that to fill the elastic body 14 with initial
fluidity to the tapered opening 4f.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described based on FIGS. 1 to 15. FIG.
The main part of the drip-proof microphone according to the present invention is in the ring
silicon 4, and the configuration other than the main part is the same as that of the conventional
example described above. Is omitted.
[0014]
A drip-proof ultrasonic microphone according to claim 1 will be described based on FIGS. 1 and
2. FIG.
In this example, as shown in FIG. 1, a ring-shaped ring silicon 4 formed of an elastic material is
fixed to the inner peripheral surface 1b of the straight pipe portion 1a of the vibration case 1,
and as shown in FIGS. As shown, a protruding portion 4 b is provided continuously to the inner
circumferential surface 4 a of the ring silicon 4, and its tip end is in close contact with the
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exposed portion 13 a of the plus lead 13.
Thus, the ring silicon 4 prevents the excitation of the straight pipe portion 1a of the vibration
case 1 and the projection 4b of the ring silicon 4 prevents the excitation of the plus lead 13 to
shorten the reverberation time It is possible to detect the reflected wave of
[0015]
Next, a drip-proof ultrasonic microphone according to claim 2 will be described based on FIGS. 3
to 4. FIG.
In this example, as shown in FIG. 3, a ring-shaped ring silicon 4 formed of an elastic material is
fixed to the inner peripheral surface 1b of the straight pipe portion 1a of the vibration case 1,
and as shown in FIG. As shown, a protruding portion 4b is provided continuously on the inner
circumferential surface 4a of the ring silicon 4, and the tip end portion thereof is brought into
close contact with the exposed portion 13a of the plus lead 13 and the solder 20 fixing the plus
lead 13 to the piezoelectric ceramic 2. The
Thereby, the ring silicon 4 prevents the excitation of the straight pipe portion 1 a of the vibration
case 1, and the projection 4 b of the ring silicon 4 prevents the excitation of the plus lead 13, and
further prevents the vibration of the solder 20. Therefore, the reverberation time can be further
shortened, and detection of reflected waves at shorter distances becomes possible.
[0016]
Next, a drip-proof ultrasonic microphone according to claim 3 will be described based on FIG. 5
to FIG.
In this example, as shown in FIG. 5, a ring-shaped ring silicon 4 formed of an elastic material is
fixed to the inner peripheral surface 1b of the straight pipe portion 1a of the vibration case 1,
and as shown in FIGS. As shown, a projecting portion 4b is provided continuously to the inner
circumferential surface 4a of the ring silicon 4, and a solder 20 for fixing the exposed portion
13a of the plus lead 13 and the plus lead 13 to the piezoelectric ceramic 2 is covered at the tip
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thereof. The
Thus, the ring silicon 4 prevents the excitation of the straight pipe portion 1a of the vibration
case 1 and the projection 4b of the ring silicon 4 more reliably prevents the excitation of the plus
lead 13 and the vibration of the solder 20. Therefore, the reverberation time can be stably
shortened, and the detection of the reflection wave at a short distance can be stably obtained.
[0017]
Next, a drip-proof ultrasonic microphone according to claim 4 will be described based on FIG. 7
to FIG. In this example, as shown in FIG. 7, a ring-shaped ring silicon 4 formed of an elastic
material is fixed to the inner peripheral surface 1b of the straight pipe portion 1a of the vibration
case 1, and as shown in FIGS. As shown, the protruding portion 4 b covering the outer periphery
of the exposed portion 13 a of the plus lead 13 protruding upward from the piezoelectric
ceramic 2 and the outer periphery of the solder 20 fixing the plus lead 13 to the piezoelectric
ceramic 2 is the inner peripheral surface 4 a of the ring silicon 4 A straight tubular opening 4c
having the plus lead 13 as a central axis and having a diameter slightly larger than the diameter
of the solder 20 is provided in the protrusion 4b, and the plus lead is provided in the straight
tubular opening 4c. The solder 13 is inserted through the exposed portion 3a and the elastic
portion 14 having initial fluidity is filled in the straight tubular opening 4c. Thus, the ring silicon
4 formed of an elastic body and fixed to the inner circumferential surface 1b of the straight pipe
portion 1a of the vibration case 1 prevents the excitation of the straight pipe portion 1a of the
vibration case 1 and also prevents initial flow. Ring silicon 4 having a straight tubular opening 4c
for filling the elastic body 14 having elasticity is aligned with the position of the plus lead 13 and
fixed to the inner circumferential surface 1b of the straight pipe portion 1a of the vibration case
1; This is a method of filling the elastic body 14 having initial fluidity in the straight tubular
opening 4 c to bring the plus lead 13 and the solder 20 into close contact with the ring silicon 4,
so that manufacture is easy and the exposed part of the plus lead 13 The adhesion between the
elastic member 14 having initial fluidity that surrounds the exposed portion 13a of the positive
lead 13 and the solder 20 and the solder 20, and the ring silicon 4 that surrounds the periphery
can be enhanced, and as a result, Excitation effect of preventing over de 13, and can increase the
vibration preventing effect of the solder 20, and shorter reverberation time, thereby enabling
more near field of the reflected wave detection. 9 (a) and 9 (b) are a top view and a crosssectional view of the ring silicon 4 used in this example.
[0018]
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Next, a drip-proof ultrasonic microphone according to claim 5 will be described based on FIG. 10
to FIG. In this example, as shown in FIG. 10, a ring-shaped ring silicon 4 formed of an elastic
material is fixed to the inner circumferential surface 1b of the straight pipe portion 1a of the
vibration case 1, and as shown in FIG. As shown, the protruding portion 4 b covering the outer
periphery of the exposed portion 13 a of the plus lead 13 protruding upward from the
piezoelectric ceramic 2 and the outer periphery of the solder 20 fixing the plus lead 13 to the
piezoelectric ceramic 2 And a straight tubular opening 4d for surrounding the solder 20 is
provided in the projection 4b, and the plus lead 13 is used as a central axis at the top, and the
upper opening circle is a taper larger than the lower opening , The solder 20 is fitted into the
straight tubular opening 4d, and the exposed portion 3a of the plus lead 13 is inserted into the
tapered opening 4e, and the initial flow is made in the tapered opening 4e. Those formed by
filling the elastic body 14 with. Thus, the ring silicon 4 formed of an elastic body and fixed to the
inner circumferential surface 1b of the straight pipe portion 1a of the vibration case 1 prevents
the excitation of the straight pipe portion 1a of the vibration case 1 and also prevents initial flow.
Ring silicon 4 having a tapered opening 4e for filling the elastic body 14 having elasticity is
aligned with the position of the plus lead 13 and fixed to the inner peripheral surface 1b of the
straight pipe portion 1a of the vibration case 1; Since the method of filling the elastic material 14
having initial fluidity in the tapered opening 4 e to bring the plus lead 13 and the ring silicon 4
into close contact with each other, the filling of the elastic material 14 is simple and easy to
manufacture. In addition, the adhesion between the exposed portion 13a of the plus lead 13 and
the elastic member 14 having initial fluidity which surrounds the exposed portion 13a of the plus
lead 13 and the ring silicon 4 surrounding the periphery can be enhanced. As a result, Plusli It is
possible to enhance the excitation effect of preventing de 13, to shorten the reverberation time,
allowing more short distance of the reflected wave detection. 12 (a) and 12 (b) are a top view and
a cross-sectional view of the ring silicon 4 used in this example.
[0019]
A drip-proof ultrasonic microphone according to claim 6 will be described with reference to FIGS.
13 to 15. In this example, as shown in FIG. 13, a ring-shaped ring silicon 4 formed of an elastic
material is fixed to the inner peripheral surface 1b of the straight pipe portion 1a of the vibration
case 1, and as shown in FIGS. As shown, the protruding portion 4 b covering the outer periphery
of the exposed portion 13 a of the plus lead 13 protruding upward from the piezoelectric
ceramic 2 and the outer periphery of the solder 20 fixing the plus lead 13 to the piezoelectric
ceramic 2 is the inner peripheral surface 4 a of the ring silicon 4 And the diameter of the lower
opening circle is slightly larger than the diameter of the outer circumference circle of the solder
20 for fixing the plus lead 13 to the piezoelectric ceramic 2, In addition, a tapered opening 4f
whose upper opening circle is larger than the lower opening circle is provided, and the tapered
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opening 4f is filled with an elastic body 14 having initial fluidity. Thus, the ring silicon 4 formed
of an elastic body and fixed to the inner circumferential surface 1b of the straight pipe portion 1a
of the vibration case 1 prevents the excitation of the straight pipe portion 1a of the vibration
case 1 and also prevents initial flow. Ring silicon 4 having a tapered opening 4f for filling elastic
body 14 having elasticity is fixed to the position of plus lead 13 and fixed to the inner
circumferential surface 1b of straight pipe portion 1a of vibration case 1 to obtain Since the
tapered opening 4f is filled with the elastic body 14 having initial fluidity to closely contact the
plus lead 13 and the solder 20 with the ring silicon 4, filling of the elastic body 14 is easy and
manufacture is also easy. The adhesion between the exposed portion 13a of the plus lead 13 and
the solder 20, the elastic body 14 having initial fluidity that surrounds the exposed portion 13a
of the plus lead 13 and the solder 20, and the ring silicon 4 surrounding the periphery is easy.
High It can be, as a result, the excitation effect of preventing the positive lead 13, and the solder
20 vibration preventing effect can be further enhanced, and to shorten the reverberation time,
allowing more short distance of the reflected wave detection. FIGS. 15 (a) and 15 (b) are a top
view and a cross-sectional view of the ring silicon 4 used in this example.
[0020]
According to the first aspect of the present invention, the ring silicon made of an elastic body and
fixed to the inner peripheral surface of the straight pipe portion of the vibration case is a straight
pipe of the vibration case. While preventing the excitation of the part, the excitation of the lead is
prevented to shorten the reverberation time, and it becomes possible to detect the reflected wave
in a short distance.
[0021]
Further, in the invention according to claim 2 of the present invention, in addition to the effects
of the invention according to claim 1, the excitation of the lead is prevented, and furthermore,
even the vibration of the solder is also prevented. The shorter the distance, the shorter the
distance of the reflected wave can be detected.
[0022]
According to the third aspect of the present invention, in addition to the effects of the second
aspect, the excitation prevention of the lead and the vibration prevention of the solder can be
made more reliable. The reverberation time can be stably shortened, and the detection of
reflected waves in a short distance can be stably obtained.
[0023]
In the invention according to claim 4 of the present invention, excitation of the straight pipe
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portion of the vibration case is performed by ring silicon formed of an elastic body and fixed to
the inner peripheral surface of the straight pipe portion of the vibration case. The straight tube is
fixed to the inner circumferential surface of the vibration case in accordance with the position of
the reed and the ring silicon provided in the projecting portion with the straight tubular opening
for filling the elastic body having initial fluidity and preventing it. Since the opening is filled with
an elastic body having initial fluidity to closely contact the lead and the ring silicon,
manufacturing is easy, and an exposed portion of the lead and an elastic body having initial
fluidity surrounding the exposed portion of the lead The adhesion between the ring silicon
surrounding the periphery can be increased, the excitation preventing effect of the lead and the
vibration preventing effect of the solder can be enhanced, and the reverberation time can be
made shorter, and the reflection wave of a near distance can be further shortened. Detection
becomes possible.
[0024]
In the invention according to claim 5 of the present invention, the ring silicon formed of an
elastic body and fixed to the inner peripheral surface of the straight pipe portion of the vibration
case prevents the excitation of the straight pipe portion of the vibration case The ring silicon
having a tapered opening for filling the elastic body having initial fluidity is aligned with the
position of the lead and fixed to the inner peripheral surface of the vibration case, and the initial
flow is made in the tapered opening. Since the elastic body is filled and the lead and the ring
silicon are in close contact with each other, the elastic body is easy to fill, easy to manufacture,
and the initial flowability surrounding the exposed portion of the lead and the exposed portion of
the lead The adhesion between the elastic body possessed and the ring silicon surrounding the
periphery can be enhanced, the excitation preventing effect of the lead can be enhanced, the
reverberation time can be shortened, and short distance detection becomes possible.
[0025]
In the invention according to claim 6 of the present invention, excitation of the straight pipe
portion of the vibration case is performed by ring silicon formed of an elastic body and fixed to
the inner circumferential surface of the straight pipe portion of the vibration case. The ring
silicon having a tapered opening for filling the elastic body having initial fluidity is fixed to the
inner peripheral surface of the vibration case in accordance with the position of the lead and is
fixed to the inner surface of the vibration case, A fluid elastic body is filled to bond the solder
that adheres the lead to the lead and the piezoelectric ceramic and the ring silicon, so that the
elastic body is easy to fill, easy to manufacture, and the exposed portion of the lead and The
adhesion between the solder, the exposed portion of the lead, the elastic body having initial
fluidity surrounding the solder, and the ring silicon surrounding the periphery can be enhanced,
and the lead's excitation preventing effect and the solder's vibration preventing effect Higher
than Rukoto can, and shorter reverberation time, allowing more short distance of the reflected
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wave detection.
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