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JP2004328728

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DESCRIPTION JP2004328728
PROBLEM TO BE SOLVED: To change acoustic characteristics in each of frequency regions of
desired width in a speaker system using a piezoelectric element. SOLUTION: In a speaker system
using piezoelectric elements, a plurality of piezoelectric vibrating bodies 30, 40, 50 are attached
to a plurality of acoustic diaphragms 12a, 14a, 15a of different dimensions. [Selected figure]
Figure 3
スピーカシステム
[0001]
The present invention relates to a speaker system using a piezoelectric element.
[0002]
A speaker provided with a piezoelectric diaphragm as a sound source of a speaker system is
known.
For example, Japanese Patent Application Laid-Open No. 11-215584 by the present applicant
discloses a speaker structure using a piezoelectric element such as a bimorph as a sound source
of a speaker system. In this speaker, a piezoelectric diaphragm is attached to an acoustic
diaphragm made of a fiber reinforced plastic such as carbon fiber to make a sound source of the
speaker.
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1
[0003]
JP-A-11-215584
[0004]
Piezoelectric diaphragms are particularly excellent in treble characteristics, but have the problem
that the sound quality is monotonous.
In addition, the amplitude of the piezoelectric diaphragm is small, so it is difficult to sufficiently
increase the sound pressure of the bass by using the piezoelectric diaphragm.
[0005]
Therefore, an object of the present invention is to provide a speaker system using a piezoelectric
element, in which the acoustic characteristic can be changed in each of the frequency ranges of
desired width.
[0006]
According to a first aspect of the present invention, there is provided a speaker system in which
each of a plurality of piezoelectric vibrators is attached to each of a plurality of acoustic
diaphragms of different sizes.
[0007]
Hereinafter, a preferred embodiment of the present invention will be described with reference to
FIGS. 1 to 3.
The speaker system 10 according to the present embodiment comprises a hollow triangular
prism-like enclosure, which is the outermost first enclosure 12 and a second enclosure 14
disposed in the first enclosure 12. And the smallest third enclosure 16 disposed in the second
enclosure 14.
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Each of the first to third enclosures 12, 14, 16 has an equilateral triangular cross section, and a
piezoelectric element or piezoelectric vibrator 30, 40, 50 is attached to one of the side walls of
each.
[0008]
The first enclosure 12 comprises a bottom wall 12a forming a first acoustic diaphragm, and two
sloped walls 12b, 12c connected to the bottom wall 12a, one end of which is open And the other
end portion is formed of a bottomed hollow member closed by an end wall (not shown). The
second enclosure 14 has a bottom wall 14a forming a second acoustic diaphragm and an end
wall common to the two beveled walls 14b, 14c and the first enclosure 12 connected to the
bottom wall 14a (shown And is formed of a bottomed hollow member closed at one end. The
bottom wall 14a of the second enclosure 14 has a smaller width dimension (left-right direction
along the paper surface of FIG. 1) than the bottom wall 12a of the first enclosure 12, and has a
small surface area.
[0009]
Furthermore, the third enclosure 16 comprises a bottom wall 16a forming a third acoustic
diaphragm, two beveled walls 16b, 16c connected to the bottom wall 16a and a first enclosure
12 and a second enclosure 14 And a common end wall (not shown), and is formed of a bottomed
hollow member closed at one end. The bottom wall 16a of the third enclosure 16 has a smaller
width dimension (left-right direction along the paper surface of FIG. 1) than the bottom wall 14a
of the second enclosure 14, and has a small surface area.
[0010]
The second enclosure 14 is fixed to the first enclosure 12 at a predetermined distance by
connecting members 18a, 18b and 18c. The connecting members 18a, 18b, 18c are preferably
each shown in FIG. 1 from the inner surface of each of the three longitudinal sides of the first
enclosure 12 and each of the three longitudinal sides of the second enclosure 14 Extended to the
outer surface of the Also, each of the connecting members 18a, 18b, 18c may be formed from a
single member extending along the entire longitudinal length of the first enclosure 12 and the
second enclosure 14, or alternatively, the first enclosure 12 and the first enclosure 12 and 18c. It
may be formed of a plurality of members discretely arranged along each side of the second
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enclosure 14.
[0011]
The third enclosure 16 is fixed to the second enclosure 14 at a predetermined distance by
connecting members 20a, 20b and 20c. The connecting members 20 a, 20 b, 20 c are preferably
each shown in FIG. 1 from the inner surface of each of the three longitudinal sides of the second
enclosure 14 and each of the three longitudinal sides of the third enclosure 16. Extended to the
outer surface of the Also, each of the connecting members 20a, 20b, 20c may be formed from
one member extending along the entire longitudinal length of the second enclosure 14 and the
third enclosure 16, or alternatively, the second enclosure 14 and the second enclosure 14 and
20c. It may be formed of a plurality of members discretely arranged along each side of the third
enclosure 16.
[0012]
Thus, the first to third enclosures 12, 14, 16 are hollow members similar in cross section, and the
third enclosure 16 is arranged in the largest first enclosure 12. The first to third enclosures 12,
14, 16 are arranged to be stacked one on top of the other into a smaller enclosure in order to
form a nested nest. Furthermore, it is preferable that the first to third enclosures 12, 14, 16 be
arranged such that their central axes coincide with each other.
[0013]
The piezoelectric vibrators 30, 40, 50 are attached to the bottom walls 12a, 14a, 16a as the
acoustic diaphragms of the first enclosure 12, the second enclosure 14, and the third enclosure
16 through seats 24. It is done. With particular reference to FIG. 2, the piezoelectric vibrators 30,
40, 50 are suitable for use on circular metal plates 32, 42, 52 made of metal thin plates such as
brass, for example, and on both sides of the metal plates 32, 42, 52. Piezoelectric vibrator or
bimorph consisting of circular ceramic layers 34, 44, 54; 36, 46, 56 attached by an adhesive. The
ceramic layers 34, 44, 54; 36, 46, 56 can be formed in a circular thin plate shape using a
ferroelectric ceramic material such as barium titanate or lead zirconate titanate. Further, rubber
annular members 38, 48, 50 as vibration control pieces are attached to one side surface of each
of the piezoelectric vibrators 30, 40, 50.
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[0014]
Electric wires (not shown) are connected to the metal plates 32, 42, 52 and the ceramic layers
34, 44, 54; 36, 46, 56, respectively, and the piezoelectric vibrators 30, 40, 50 It is connected to
an amplifier and other sound source devices (not shown) via Here, in order to electrically connect
the ceramic layers 34, 44, 54; 36, 46, 56 to the metal plates 32, 42, 52 and the electric wires,
both sides of the ceramic layers 34, 44, 54; 36, 46, 56 A conductive layer (not shown) is formed
on the surface by a method such as silver plating.
[0015]
The piezoelectric diaphragm thus formed has bottom walls 12a, 14a, a bottom wall 12a, 14a,
16a, a seat 24 and a through bolt 22 having a head 22a penetrating the piezoelectric diaphragm,
a washer 26 and a nut 28. It is fixed to 16a. At that time, by adjusting the position of each of the
nuts 28 along the through bolts 22, it is possible to apply tension to the bottom walls 12a, 14a,
16a.
[0016]
Hereinafter, the operation of the first embodiment will be described. By connecting the
piezoelectric vibrators 30, 40, 50 to an amplifier (not shown) and applying an audio signal, the
piezoelectric diaphragm is bent according to the audio signal, and the vibration thereof is
transmitted through the seat 24 to the respective enclosures. It is transmitted to the bottom walls
12a, 14a, 16a. As a result, the bottom walls 12a, 14a, 16a vibrate, and the vibrations are
transmitted to the air in contact with the bottom walls 12a, 14a, 16a, from the open end of the
enclosures 12, 14, 16 toward the exterior space of the enclosures. Released.
[0017]
At that time, since the piezoelectric vibrators 30, 40, 50 are attached to the acoustic diaphragms
(bottom walls 12a, 14a, 16a) of different width dimensions, the vibrations in the respective
acoustic diaphragms according to the dimensions In the first acoustic diaphragm 12a, the sound
pressure in the low tone region is high, and in the second acoustic diaphragm 14a, the sound
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pressure in the middle sound region is high, and in the third acoustic diaphragm 16a, the high
sound region is different. The sound pressure in the Further, by adjusting the dimensions of the
first to third acoustic diaphragms 12a, 14a, 16a, it becomes possible to freely adjust the
characteristics in each of the bass, mid-tone and treble regions.
[0018]
Further, bottom walls 12a, 14a, 16a forming a plurality of acoustic diaphragms are arranged in
parallel to one another, and the bottom walls 12a, 14a, 16a are through bolts 22 penetrating the
piezoelectric vibrators 30, 40, 50 and The piezoelectric vibrators 30, 40, 50 are fixed to the
bottom walls 12a, 14a, 16a as corresponding acoustic diaphragms, while being connected to
each other by nuts 28 screwed to the bolts. By adjusting the nut 28, it is possible to adjust the
tension applied to the bottom walls 12a, 14a, 16a as acoustic diaphragms, and to change the
acoustic characteristics of each of the bottom walls 12a, 14a, 16a. It becomes possible.
[0019]
Although the preferred embodiment of the present invention has been described, it is to be
understood by those skilled in the art that the present invention is not limited to this
embodiment and that various changes and modifications are possible. For example, although in
FIG. 3 the enclosures 12, 14, 16 are illustrated as having the same length in the longitudinal
direction, the length of each of the enclosures 12, 14, 16 (on the paper of FIG. The vertical
direction length may be formed to be progressively shorter from the first enclosure 12 to the
third enclosure 16. The same applies to the embodiments of FIGS. 4 and 5 described later. That
is, the different dimensions may be longitudinal as well as width. If the acoustic diaphragm has a
non-rectangular shape, for example, a circular shape, the radii can be made different.
[0020]
Moreover, in the embodiment described above, the speaker system 10 includes the hollow
columnar enclosure having a regular triangle in cross section, but may have another shape. For
example, the two sloped walls may be isosceles triangles or other triangles of the same length.
For example, in the embodiment shown in FIG. 4, the loudspeaker system 100 comprises a
square prismatic, cuboid or cubic enclosure. That is, the speaker system 100 is disposed in an
outer quadrangular prism first enclosure 110, a quadrangular prism second enclosure 120
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disposed in the first enclosure 110, and a second enclosure 120. The piezoelectric vibrators 30,
40, and 50 are attached to one side of each of the first to third enclosures 110, 120, and 130,
respectively.
[0021]
Also, in the embodiments shown in FIGS. 1 to 3, the enclosures 12, 14, 16 are open at one end in
the longitudinal direction so that sound is emitted in that direction. However, as shown in FIG. 4,
all sides of the hollow enclosures 110, 120, 130 may be closed by the side walls, and the opening
110 may be formed in one of the side walls. .
[0022]
Moreover, although what is called a bimorph which stuck the ceramic layer on the both sides of a
metal plate as a piezoelectric element or a piezoelectric vibrating body is shown by FIG. 2, the
piezoelectric vibrating body sticks a ceramic layer only to one side of a metal plate. It may be a
so-called monomorph.
[0023]
In the embodiments described above, the piezoelectric vibrators were attached to all the
enclosures, but in the present invention, the piezoelectric vibration is applied to the side walls of
the plurality of enclosures other than at least the outermost one of the plurality of nested
combinations. It is enough if you attach the body.
That is, the outermost enclosure may not necessarily have the piezoelectric vibrator attached, in
which case the outermost enclosure acts as a housing for the entire loudspeaker system.
[0024]
Referring now to FIG. 5, the speaker system 200 comprises first to third hexagonal prismatic
enclosures 210, 220, 230 of different sizes nested within the rectangular prismatic outer
enclosure 202. In this embodiment, the outer enclosure 202 acts as a housing for surrounding
and supporting the first to third hexagonal column shaped enclosures 210, 220, 230.
[0025]
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In the present embodiment, each of the first to third hexagonal column shaped enclosures 210,
220, 230 is formed of side walls 210a to 210f, 220a to 220f, 230a to 230f.
Piezoelectric vibrators 30, 40, 50 are attached to the opposing side walls 210a, 210d; 220a,
220d; 230a, 230d of the first to third enclosures 210, 220, 230, respectively.
[0026]
The first to third enclosures 210, 220, 230 are supported by four support members 240
extending inward from the inner surface of the outer enclosure 202.
Each of the support members 240 comprises a bolt 242 penetrating the first to third enclosures
210, 220, 230, the first to third enclosures 210, 220, 230 being elastic members, preferably
urethane foam. And the like are secured to the bolt 242 via resilient members 244, 246, which
are secured to the inner surface of the opposing side wall 204 of the outer enclosure 202 via a
suitable metallic support member 248. There is. As described above, by supporting at least the
side walls 210a, 210d; 220a, 220d; 230a, 230d forming the acoustic diaphragm by the elastic
material, it is possible to change the acoustic characteristics of the respective side walls.
[0027]
1 is a front view of a loudspeaker system according to a preferred embodiment of the present
invention. It is the elements on larger scale of the speaker system of FIG. FIG. 2 is a schematic
perspective view of the speaker system of FIG. 1; FIG. 6 is a front view of a speaker system
according to another embodiment of the present invention. FIG. 10 is a front view of a speaker
system according to still another embodiment of the present invention.
Explanation of sign
[0028]
DESCRIPTION OF SYMBOLS 10 ... Speaker system 12 ... 1st enclosure 12a ... Bottom wall (1st
acoustic diaphragm) 14 ... 2nd enclosure 14a ... Bottom wall (2nd acoustic diaphragm) 16 ... 3rd
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enclosure 16a ... bottom wall (Third acoustic diaphragm) 30 ... piezoelectric vibrator 40 ...
piezoelectric vibrator 50 ... piezoelectric vibrator
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