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DESCRIPTION JPS61216600

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DESCRIPTION JPS61216600
[0001]
FIELD OF THE INVENTION The present invention relates to a high power ultrasonic speaker that
generates high power ultrasonic waves. 2. Related Art Conventionally, as a speaker for
generating high-power ultrasonic waves, as shown in FIG. 6, there is a speaker provided with a
large number of ultrasonic sound generators 1 on one speaker substrate 2. Fig. 6 (,) is a front
view of the entire speaker, and Fig. 6 (b) is an enlarged cross-sectional view taken along the line
B-B of Fig. 6 (,). A piezoelectric element 11 is used for the ultrasonic speaker 1, and an electrode
12 is formed on one side of the body by vapor deposition or the like, and the other side is
bonded to a conductive base 13 such as aluminum. When positive and negative oscillating
voltages are applied to the electrode 12 and the base 13 from the input terminal 15.16, the
piezoelectric element 11 causes stretching vibration in the radial direction, but the side of the
base 13 to which the piezoelectric element 11 is not bonded is stretched As a result, bending
vibration will occur as a whole. This vibration emits an acoustic wave into space directly or
through the cone 14. However, since the ultrasonic sounding body 1 has small output sound
pressure, it is necessary to use many in combination to obtain high output. Reference numeral 17
denotes a vibrator supporting member, 18 an ultrasonic speaker substrate, 19 an adhesive for
bonding the cone and the electrode, and 2o a wiring. Problems to be solved by the speaker BA In
such a conventional configuration, it is not only complicated to assemble using a large number of
ultrasonic sounding bodies 1 in order to realize a high-power ultrasonic speaker, but also after
assembly Wiring to the input terminals 15 and 16 of the sound wave generator 1 can not be
easily performed. The present invention has been made in view of the foregoing points, and
provides a high-power ultrasonic speaker which can be assembled and distributed easily and
easily. Means for Solving the Problems In order to solve the above problems, the present
invention bonds piezoelectric elements having a plurality of electrodes formed on one side on
one large conductive substrate at regular positions and By sandwiching and fixing the conductive
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element and the nonconductive spacer having a hole in a certain portion of the piezoelectric
element, a high-power ultrasonic speaker having a large number of ultrasonic sound generators
independent of each other can be obtained. Further, the output sound pressure can be increased
without the difficulty of the process by bonding a large number of cones, which are integrally
formed according to the position of the piezoelectric element, to the center of the electrode.
Furthermore, by making the cone conductive and bonding it to the electrode and the conductive
spacer with a conductive adhesive, the process of wiring to the electrode is omitted. According to
the present invention, according to the above-described structure, a substrate in which a large
number of piezoelectric elements are regularly joined, a spacer, a cone member formed in a large
number at the same position as an ultrasonic sounding body formed by many piezoelectric
elements and spacers. Basically, it is divided into three parts, which makes the assembly very
easy.
Embodiment 1 FIGS. 1 (a) and 1 (b) are a front view and a sectional view taken along the line A-A
showing a first embodiment of a high-power ultrasonic speaker according to the present
invention. In FIG. 1, 1 is an ultrasonic generator, 3 is a positive and negative signal input line to a
speaker, 4 and 4 are conductive spacers, 6 is a nonconductive spacer, 11 is a piezoelectric
element, 12 is an electrode, and 13 is a large number. A conductive base material for bonding the
piezoelectric element 11, and 2 o is a wire for connecting the conductive spacer 4 to the
electrode 12. The operation of the high-power ultrasonic speaker configured as described above
will be described below. First, the voltage applied from the signal input line 3 is applied to the
electrodes 12 and the base material 13 of the ultrasonic sounding body 1 which work
independently via the conductive spacer 4, and the piezoelectric element is applied due to the
applied electric field A radial expansion and contraction change occurs in 11. Since the
piezoelectric element 11 is bonded to the base material 13, the expansion and contraction of the
bonded base material 13 is larger than that of the non-bonded side, and the expansion change is
a bending change and the applied electric field vibrates. As a result, bending vibration occurs and
sound waves are emitted. In order that the ultrasonic sounding body 1 which works
independently each vibrates in the same phase, the sound pressure which arose from each is
added, and the speaker which generates the ultrasonic wave of high output is realized. FIG. 2
shows a second embodiment of the present invention in which the conductive base material 13
has a thickness distribution, and the same parts as those in FIG. The same applies to the
following drawings. According to this embodiment, the flexural vibration becomes larger, and a
much larger output can be obtained. 2b is a cross-sectional view, and FIG. 2b is an enlarged
cross-sectional view of a main part of the circle C in FIG. Fig. 3 (,) is a cross-sectional view of the
third embodiment, and Fig. 3 (b) is an enlarged cross-sectional view of the main part of the circle
in Fig. 3 (-). In the third embodiment, the cone 14 is bonded to the electrodes 12 of the
piezoelectric elements 11 and the conductive spacers 4b and aa with an adhesive 19 in order to
increase the acoustic efficiency. Although many cones 14 are shown in FIG. 3 in the form
integrally-molded, the same effect can be obtained even if they are independent of each other.
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Further, by bonding to the conductive spacers 4b, 4a, the waterproof effect is enhanced, and
there is an effect of protecting the piezoelectric element 11 which is weak to humidity. Although
this embodiment is an ultrasonic speaker having the piezoelectric elements 11 provided on both
sides of the substrate 130, the same effect can be obtained even if only one side or a cone is
connected to only one side. Reference numeral 6a denotes a nonconductive spacer. FIG. 4 shows
that the cone 14 is made of a conductive material and this wire is joined with the electrode 12
and the spacer 14 with a conductive adhesive to omit the wiring required between the spacer 14
and the electrode 12 This is the fourth embodiment.
FIG. 6 shows a fifth embodiment in which various combinations of the piezoelectric elements 11
are not made uniform. By changing the size of the piezoelectric element 11 in this manner, the
resonance frequency and the sound pressure of the ultrasonic waves generated by each of the
ultrasonic sound generators 1 change, and the versatility in which the characteristics can be
controlled as a speaker is expanded. Reference numerals 4o and 4f denote conductive spacers,
and 5b denotes a nonconductive spacer. As described above, according to the present invention,
it is possible to realize a high-power ultrasonic speaker which can be assembled and wired very
easily. Furthermore, while only the emission of ultrasonic waves in the front direction of the
speaker can be obtained conventionally, the emission in the back direction is also realized
simultaneously, and the use of the speaker can be greatly expanded.
[0002]
Brief description of the drawings
[0003]
Fig. 1 (,) is a front view of the high-power ultrasonic speaker according to the first embodiment
of the present invention, Fig. 1 is a sectional view taken along the line A-A of Fig. 1 (,), Fig. 2 (, Is
a cross-sectional view of the second embodiment, FIG. 2 (b) is an enlarged cross-sectional view of
the same part, FIG. 3 (,) is a cross-sectional view of the third embodiment, and FIG. FIG. 4 is a
cross-sectional view of the fourth embodiment, FIG. 6 is a cross-sectional view of the sixth
embodiment, and FIG. 6 (-) is a conventional high-power ultrasonic speaker FIG. 6 (b) is a crosssectional view taken along the line B-B of FIG.
1------Ultrasonic sounding body, 4, 4a, 4b, 4c. , Ad, 4f, + иии и и и и и и и и и conductive spacer, 5.5a и и и и
non-conductive spacer, 11 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
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и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и nonconductive spacer 13 иииииии Conductive substrate, 14 ииииииииииии Cone. Name of agent Attorney Nakao
Toshio Other 1 person 4.4LL-IFjt company A-5-. ) Re--# :, diseased f3---f4i ? 20-? 4at Figure 3
Figure 41 XI
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