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DESCRIPTION JPS59139799

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DESCRIPTION JPS59139799
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
so-called flat-plate speaker having a flat-plate-like diaphragm, and in particular, a piezoelectric
element is used as a drive source to simplify the structure and suppress the generation of
vibration modes to obtain frequency characteristics It relates to a flat loudspeaker that can be
improved. [Background Art and Problems Thereof] Conventionally, in a flat panel speaker having
a flat diaphragm using a hollow core member having a honeycomb structure or the like, one of
voice coil bobbins in which a voice coil is wound around the above diaphragm. The end face
portion of the voice coil is abutted and connected, the driving force of the voice coil is
transmitted to the diaphragm via the voice coil bobbin, and the diaphragm is driven to drive the
voice coil, thereby reproducing the reproduced sound based on the driving force. The diaphragm
is designed to emit sound from the previous time. And, in this type of speaker, the vibration mode
is generated in the diaphragm at the co-expansion frequency, and a large peak or valley is
generated in the frequency characteristic ', particularly in the low-order vibration mode. A
driving point is provided at a node portion of the vibration phase in the vibration mode, so that
the vibration mode of the diaphragm is in a substantially parallel piston motion state. For
example, when the diaphragm is a square, the vibration mode 102 according to the fourth
vibration mode of the diaphragm 101 is as shown in FIG. 1A and FIG. 1B. By setting the points a
to d serving as nodes as driving points, it is possible to substantially improve the frequency
characteristics by making the vibration mode of the diaphragm 101 a substantially parallel
piston movement. By the way, in the flat type speaker in which a plurality of drive points are
provided to improve frequency characteristics as described above, when the voice coil described
above is used as a drive source of the diaphragm, each of the drive points described above Each
of the voice coils must be provided correspondingly, and the structure becomes very complicated
and the manufacturing cost is greatly increased. SUMMARY OF THE INVENTION Therefore, the
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present invention is proposed to solve the above-mentioned drawbacks of the prior art, and
simplifies the structure of the drive source of the diaphragm and significantly reduces the
manufacturing cost and is inexpensive. To provide the market with flat-plate speakers.
Furthermore, the object of the present invention is to provide a flat-panel speaker drive source
that can easily cope with the case where a plurality of drive points are required to make the drive
form of the diaphragm appropriate. I assume. [Summary of the Invention] In order to achieve the
above-mentioned object, the present invention relates to a flat panel speaker in which a
diaphragm is formed in a flat plate shape, using a piezoelectric element as a drive source, and
transmitting the piezoelectric element It is connected to the diaphragm.
EXAMPLES Specific examples of the present invention will be described below with reference to
the drawings. FIGS. 2 and 3 show an example in which the present invention is applied to a
square flat type speaker, wherein a core material formed as a honeycomb structure formed of a
foam polystyrene plate is provided with a coating such as aluminum, and is thus formed. A
diaphragm 1 in the form of a circle is attached to the front side of the frame 3 via an edge 2
attached to its periphery. On the other hand, on the back surface of the diaphragm 1, the -S
portion is fixed to a part of the corner of the frame 3 and the tips of four approximately R-shaped
metal plates 4 extended on the back surface side of the diaphragm 1 , And is connected to the
diaphragm 1 by bending the tip of the tongue 5 formed at this tip at a right angle as shown in
FIG. At this time, since the metal plate 4 may damage the diaphragm 1 such that the shoulder
4aK supports the back surface of the diaphragm 1, for example, as shown in FIG. It may be
provided to secure the diaphragm 1. Further, as shown in FIG. 5, this metal plate 4 is formed into
an approximately R shape by bending an elastic copper plate or brass plate at a right angle, and
when attached to the frame 3, the diaphragm A strip-like piezoelectric element 6 having a
conductive metal serving as an electrode vapor-deposited on both sides thereof is attached to a
surface which is horizontal to 1. The pressure sensor 6 used here may be either a monomorph or
a bimorph. Then, a voltage is applied to the piezoelectric element 6 to cause the deformation of
the piezoelectric element 6, and the driving force due to the deformation is transmitted to the
diaphragm 1 through the metal plate 4 as the transmission means, and this diaphragm 1 is
configured to be driven. By the way, the front end portions of the four metal plates 4 are
respectively connected to positions a-d of the vibration phase nodes of the first vibration mode in
the diaphragm 1 as shown in FIG. It is possible to effectively transmit the drive by the
piezoelectric element 6 to the diaphragm 1 and drive it so as to be a stone motion such as
approximately parallel. At this time, there are valleys of characteristics due to higher order
vibration modes, but there is no problem in practical use. In particular, in the high-order
vibration mode, there are a large number of very fine divided vibrations, and the adverse effects
are almost eliminated. Therefore, by regulating the first vibration mode, it is possible to prevent
most of the deterioration of the frequency characteristics. As described above, in the above
embodiment, since the pressure element 6 is used as the drive source of the flat panel speaker,
the structure of the drive source is extremely simplified, and the number of members used is
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significantly reduced. It is possible to reduce it significantly.
Furthermore, in the above embodiment, the drive sources consisting of the piezoelectric element
6 and the metal plate 4 are simply arranged at the four optimum drive points, respectively, to
prevent the generation of the vibration mode of the diaphragm 1, thereby achieving good
frequency characteristics. To obtain flat-plate speakers. Two possible. By the way, in the above
embodiment, for example, as shown in FIG. 6, it is possible to provide the slits 7 in the metal
plate 4 so as to reduce the weight of the metal plate 4 without any decrease in strength. Further,
as shown in FIGS. 7 and 8, the four metal plates 4 are connected by the thin rod-like connecting
member 8, the vibration phases of the respective metal plates 4 are aligned, and the driving force
is the diaphragm 1 It is also possible to more effectively prevent the occurrence of the vibration
mode by more effectively transmitting. Next, FIGS. 9 and 10 show another embodiment to which
the present invention is applied. In this embodiment, a disk-shaped piezoelectric element 9 is
used as a drive source of the diaphragm 1. That is, while the disk-shaped piezoelectric element 9
is attached to the surface of the disk-shaped metal plate 100 whose center is fixed to the bottom
surface of the frame 3, the protruding portions 11 are formed on the metal plate 10 at four
locations. The projecting portions 11 are connected to the positions of nodes in the first vibration
mode of the diaphragm 1 to drive the diaphragm 1. In this embodiment, even in the case where a
plurality of drive points are provided on the diaphragm 1, the single piezoelectric element 9 may
be used alone, and the structure can be further simplified, and the vibration phase at each drive
point can be It is possible to ensure alignment and improve the characteristics. When the
diaphragm 1 has a square shape, the piezoelectric element 9 and the metal plate 10 can also be
formed into a square shape in the same manner. The shapes should be changed according to the
shape of the diaphragm. Of course it is possible. In the above embodiments, the same members
are denoted by the same reference numerals. By the way, the present invention is not limited to
the above-mentioned respective embodiments, and can be applied to flat type speakers of any
kind of shape. For example, if the diaphragm is circular, the nodes of the vibration phase in the
first vibration mode of the circular diaphragm become circular, so the entire back surface of the
circular node is on the back surface of the diaphragm. A drive ring having high rigidity is
provided, and the drive ring is driven using a plurality of strip-like piezoelectric elements or
driven using a disk-like piezoelectric element to obtain the same effect as that of the previous
embodiment. It is possible. As is apparent from the above description of the embodiment,
according to the present invention, the structure of the drive source of the diaphragm can be
extremely simplified and the manufacturing cost can be significantly reduced, which is
inexpensive. It has become possible to provide flat speakers to the market.
Furthermore, according to the present invention, the present invention makes it easy to cope
with the need for a plurality of drive points, make the vibration mode of the diaphragm
appropriate, and obtain a flat panel speaker with good characteristics. It has become.
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[0002]
Brief description of the drawings
[0003]
1A and 1B are schematic diagrams showing the diaphragm operation for explaining the
arrangement position of the drive source of the square diaphragm, FIG. 1A is a side view, and
FIG. 1B is a plan view It is.
2 and 3 show a flat panel speaker to which the present invention is applied, FIG. 2 is a
longitudinal sectional view, FIG. 3 is a betting view along the line A-A in FIG. 2, and FIG. Similarly,
FIG. 5 is a longitudinal sectional view of an essential part showing a mounting state of a metal
plate on a diaphragm, and FIG. 5 similarly comprises a metal plate and a piezoelectric element.
FIG. 6 is an enlarged external perspective view showing a state in which a slit is formed in a
metal plate, and FIGS. 7 and 8 are states showing a state in which a connecting member is
provided between metal plates. 7 is a longitudinal sectional view, and FIG. 8 is a sectional view
taken along the line B--B in FIG. 9 and 10 show another embodiment of the present invention,
FIG. 9 is a longitudinal sectional view, and FIG. 10 is a sectional view taken along the line C--C in
FIG. 1 · · · Diaphragm 4. 10 · · · Metal plate (transmission means) 6.9 · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · pressure · turtle element patent applicant Person Sony Corporation
attorney patent attorney small pond lookout 1) village 榮-first 1 figure (A) figure 1 (B) figure 2
figure 3 figure 4 figure 5 figure 6 figure 7 figure 8 figure 9 figure 0
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