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JP2010251816

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010251816
PROBLEM TO BE SOLVED: To provide a thin-type acousto-electro-mechanical transducer capable
of obtaining better acoustic characteristics than the conventional one by preventing fluttering of
a diaphragm. SOLUTION: A flat speaker 10 as a thin-type acousto-electro-mechanical transducer
according to the present invention is provided with a vibrating membrane 12 having a structure
in which a coil is formed in close contact with a flexible thin film, A pair of permanent magnet
plates 18 and 20, and a front cover 22 and a back plate 24 as a housing for holding them. When
current flows in the coil, a mechanical force along the thickness direction of the vibrating
membrane 12 acts on the coil according to Fleming's left-hand rule. Then, the vibration film 12
vibrates accompanying the coil to generate a sound wave. The vibrating film 12 is fixed to the
housing via terminal plates 62 and 64 provided at upper and lower two places. Therefore,
fluttering when the vibrating film 12 vibrates can be prevented, and good acoustic characteristics
can be obtained. [Selected figure] Figure 1
Thin-type electro-mechanical transducer
[0001]
The present invention relates to a thin-type acousto-electro-mechanical transducer, and in
particular, a vibrating membrane having a structure in which a coil is formed in intimate contact
with a thin film having flexibility, and a vibrating membrane provided opposite to the vibrating
membrane A magnet plate for generating a magnetic field, and a casing for holding the vibrating
membrane and the magnet plate, the current flowing through the coil and the mechanical force
acting on the coil along the thickness direction of the vibrating membrane from one to the other
The invention relates to a thin acousto-electromechanical transducer that converts
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1
[0002]
As a thin-type acousto-electro-mechanical transducer of this type, there is conventionally a flat
speaker (flat plate speaker) disclosed in, for example, Patent Document 1.
The flat speaker comprises a permanent magnet plate, a vibrating membrane disposed to face the
permanent magnet plate, a buffer member interposed between the permanent magnet plate and
the vibrating membrane, and a relative position of the vibrating membrane to the permanent
magnet plate And a supporting member for regulating Then, on the surface of the permanent
magnet plate on the side facing the vibrating film, a parallel stripe multipole magnetization
pattern in which strip-like N and S poles alternately appear is formed over the entire surface. Of
the multipolar magnetization pattern surface, there is basically no magnetic field in the direction
perpendicular to the multipolar magnetization pattern surface in the vicinity of the boundary
between the N pole and the S pole. Near the boundary with the pole is called the neutral zone. On
the other hand, the vibrating membrane has a structure in which a coil composed of a
meandering conductive wire pattern is printed on a thin and flexible resin film, and the linear
portion of the conductive wire pattern corresponds to a position corresponding to the neutral
zone of the permanent magnet plate. Is provided. Furthermore, only the displacement in the inplane direction of the diaphragm is restricted, and the diaphragm is supported by the support
member so as to be freely displaced in the thickness direction. The buffer member is flexible and
air-permeable, and has a structure in which sheets of approximately the same size as the
vibrating membrane are stacked, or between the sheet and the permanent magnet plate, or the
sheet and the vibrating membrane And so as to form a gap therebetween.
[0003]
According to the flat speaker configured in this way, the magnetic force lines pass in the
direction orthogonal to the straight portion of the coil (conductor pattern). Therefore, when a
drive current is supplied to the coil, a mechanical force (electromagnetic force) along the
thickness direction of the vibrating membrane acts on the coil according to Fleming's left-hand
rule. Then, the vibrating film (resin film) vibrates in the thickness direction accompanying the
coil, and as a result, a sound wave is generated. That is, for the generation of the sound waves,
conversion from electrical energy as a drive current to mechanical energy as a mechanical force
is performed. On the contrary, the prior art is applicable to both the conversion from mechanical
energy to electrical energy and, in short, to the microphone.
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[0004]
JP-A-9-331596
[0005]
By the way, although not clearly shown in the above-mentioned prior art, usually, the both ends
of the coil are connected to the terminal fixed to the case of the flat speaker.
Moreover, this terminal is concentratedly provided in one place in the prior art from the
viewpoint of the easiness of connection with external wiring and the appearance design.
However, when the terminals are concentrated at one place, the diaphragm including the coil is
fixed to the housing at the one place. Then, when the vibrating membrane vibrates, this one point
serves as a fulcrum, and the vibrating membrane runs wildly, which is to say, fluttering. It is
needless to say that this flapping adversely affects the acoustic characteristics.
[0006]
Then, an object of the present invention is to provide a thin acousto-electro-mechanical
transducer that can obtain better acoustic characteristics than conventional ones by eliminating
the flap of the vibrating membrane.
[0007]
In order to achieve this object, according to the present invention, there is provided a vibrating
membrane having a structure in which a coil is formed in intimate contact with a thin film having
flexibility, and a magnetic field provided opposite to the vibrating membrane and crossing the
extension direction of the coil. A magnet plate to be generated and a casing for holding the
vibrating membrane and the magnet plate are provided, and one of the current flowing in the coil
and the mechanical force acting on the coil along the thickness direction of the vibrating
membrane is converted to the other A thin acousto-electro-mechanical transducer is assumed.
Under this premise, a pair of ends of the coil at two side edges of the vibrating membrane, which
are substantially symmetrical with each other with respect to a straight line, and substantially
symmetrical with each other with respect to a certain point on the straight line. A processing unit
is provided. And a pair of terminal processing parts of this coil are characterized by being
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connected to a terminal fixed to a case corresponding to each.
[0008]
According to the invention thus constructed, a magnetic field is generated from the magnet plate
which traverses the extension direction of the coil. Here, for example, it is assumed that current
flows in the coil. Then, according to Fleming's left-hand rule, mechanical force along the
thickness direction of the vibrating membrane acts on the coil. Then, the vibrating film (thin film)
vibrates in the thickness direction accompanying the coil, and as a result, a sound wave is
generated. That is, for the generation of the sound waves, conversion from electrical energy of
current to mechanical energy of mechanical force is performed, that is, a speaker is realized. On
the contrary, when a sound wave strikes the vibrating membrane, mechanical force acts on the
vibrating membrane. Then, the vibrating membrane vibrates along the thickness direction, and
along with this, the coil also vibrates. As a result, current flows in the coil according to Fleming's
right-hand rule. That is, the conversion of mechanical energy, which is applied by sound waves,
into electrical energy is performed, that is, a microphone is realized.
[0009]
By the way, in the present invention, a pair of coils is formed at two side portions of the vibrating
membrane, which are substantially symmetrical with each other with respect to a straight line
and substantially symmetrical with respect to a certain point on the straight line. A terminal
processing unit of, for example, both ends of the coil is provided. And both ends of this coil are
connected to the terminal fixed to the case corresponding to each. That is, the vibrating
membrane including the coil is fixed to the housing at the two places. And, this fixed state is
balanced. Therefore, when the vibrating membrane vibrates, the above-mentioned flapping is
prevented.
[0010]
In the present invention, an even number of coils may be formed. In this case, each coil has one
end as a first terminal portion and the other end as a second terminal portion. The relationship
between the current flowing between the first end portion and the second end portion of each
coil and the mechanical force acting on each of the coils is common to each coil. For example,
when a current flows from a first end to a second end of a certain coil, a mechanical force in a
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certain direction acts on the certain coil. Then, also when current flows from the first end of the
other coil to the second end, the mechanical force in the same direction acts on the other coil. In
addition, for example, when a mechanical force acts on the vibrating membrane by the sound
wave striking the vibrating membrane, current in the same direction flows in all the coils.
Because of this relationship, for each coil, the first terminal unit is provided at one of the two
locations described above, and the second terminal unit is provided at the other of the two
locations. Further, it is assumed that the number of each of the first terminal unit and the second
terminal unit is the same between these two places. Furthermore, a terminal is provided
corresponding to each of all the first terminals and all the second terminals.
[0011]
According to this configuration, the usage modes (variations) of the thin-type acousto-electromechanical transducer of the present invention become rich and flexible. For example, in the case
where only one thin-type acousto-electromechanical transducer is used, all the coils may be
connected in series. Specifically, the terminal connected to the first end of one of the coils and
the terminal connected to the second end of the other coil are connected to the external wiring
on one side of the two places described above With regard to the other terminals, those
connected to any first terminal unit and those connected to any second terminal unit are
connected to each other. And in the other side of two places, what was connected to the arbitrary
1st terminal part and the thing connected to the arbitrary 2nd terminal part are mutually
connected about all the terminals. As a result, one long coil is formed, so high conversion
efficiency can be obtained. Moreover, since the connections between the terminals are made
close to each other, the work is easy and simple.
[0012]
In addition, for example, when a plurality of thin acousto-electro-mechanical transducers are
used, all the coils may be connected in series between the plurality of thin acoustoelectromechanical transducers. Specifically, for each thin-type acousto-electro-mechanical
transducer, on one side of the two places described above, the terminal connected to the first end
of one of the coils and the second end of the other coil With respect to all the terminals except
for the connected terminals, one connected to an arbitrary first terminal unit and one connected
to an arbitrary second terminal unit are connected to each other. Further, also on the other side
of the two places, all the terminals except for the terminal connected to the first end of one of the
coils and the terminal connected to the second end of the other coil. , One connected to an
optional first terminal unit and one connected to an optional second terminal unit are mutually
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connected. Then, among the terminals which are not connected between one side of the abovementioned two places in one thin-type acousto-electro-mechanical converter and the other side
of the two places concerned in another thin-type acousto-electromechanical converter The
terminal connected to the first terminal portion and the terminal connected to the second
terminal portion are connected to each other. A similar connection is made between all thin
acousto-electromechanical transducers. However, for one thin-type acousto-electro-mechanical
converter, two terminals not connected are connected to each other on one side of the two
places. At the same time, as for the other thin-type acousto-electrical mechanical converter, the
external wiring is connected to the two terminals not connected on the other side of the two
parts. As a result, all the coils are connected in series between the plurality of thin acoustoelectrical electromechanical transducers, in other words, the respective thin acoustoelectromechanical transducers are connected in series to constitute a so-called array. Moreover,
since the connections between the thin-type acousto-electro-mechanical transducers are made
between the terminals close to each other, the operation is easy and simple.
[0013]
The present invention is suitable for a speaker. In particular, the larger the diaphragm, the better.
That is, in the case where the vibrating film is fixed at one place as in the above-described prior
art, as the vibrating film is larger, the above-described flapping is more likely to occur. The
present invention is extremely effective for a speaker having such a large diaphragm which is
prone to flutter.
[0014]
In addition, when the present invention is applied to a speaker, the coil may have a protrusion
projecting in a direction transverse to the extension direction of the coil. By providing such a
projection on the coil, the adhesion between the coil and the thin film at the portion where the
projection is provided is increased. This means that the responsiveness of the thin film vibrating
accompanying to the coil is improved in the portion where the protrusion is provided. On the
other hand, in the portion provided with the protrusion, the weight also increases by the amount
of the protrusion, which also affects the responsiveness. That is, the provision of the projection
changes the response of the entire vibrating membrane, and thus changes the acoustic
characteristics of the entire speaker. In other words, the protrusion functions as a control unit
that controls the acoustic characteristics of the entire speaker. In addition, since a current does
not flow in the protrusion, the provision of the protrusion does not particularly affect the current
flowing in the coil.
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[0015]
Furthermore, in the case where a communication passage connecting the space in which the
vibrating membrane is present with the external space is provided, it is desirable that the
projecting portion be provided in accordance with the communication passage. That is, the
communication path referred to herein functions as a sound wave emission path for emitting the
sound wave generated by the vibration of the vibrating membrane toward the external space.
Therefore, the effectiveness of the protrusion becomes more remarkable by providing the
protrusion in accordance with the communication passage functioning as such a sound wave
emission passage.
[0016]
As described above, according to the present invention, the vibrating membrane including the
coil is fixed in two balanced places. Therefore, unlike the prior art in which the vibrating
membrane is fixed at one place and causes the flap, the flap is prevented. Therefore, it is possible
to obtain better acoustic characteristics than in the past.
[0017]
It is a figure which shows schematic structure of the flat speaker which concerns on one
Embodiment of this invention. It is an assembly drawing of the same plane speaker. It is an
illustration figure which shows schematic structure of the diaphragm in the same plane speaker.
It is an illustration figure which shows the fixed state of the vibrating membrane. It is an
illustration figure which shows the usage condition of the same plane speaker. It is an illustration
figure which shows the use aspect different from FIG. It is an illustration figure which shows the
fixed state of the vibrating membrane in the prior art for comparison and control of this
embodiment. It is an illustration figure which shows another example of the prior art. It is an
illustration figure which shows the vibrating membrane of the aspect different from FIG. FIG. 10
is an illustrative view showing a vibrating membrane in a further different mode from FIG. 9; FIG.
11 is an illustrative view showing a vibrating membrane in a further different mode from FIG. 10;
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[0018]
One embodiment of the flat speaker 10 to which the present invention is applied will be
described below.
[0019]
As shown in FIG. 1, the flat speaker 10 according to the present embodiment is a flat,
substantially rectangular parallelepiped in appearance.
Further, structurally, as can be understood from the assembly drawing shown in FIG. 2, one
vibrating membrane 12 and two buffer members 14 and 16 provided so as to sandwich both
sides of the vibrating membrane 12; It consists of two permanent magnet plates 18 and 20
provided so as to sandwich these buffer members 14 and 16 from the outside, and a front cover
22 and a back plate 24 as a housing.
[0020]
As shown in FIG. 3, the vibrating membrane 12 is composed of a substantially rectangular thin
film 26 and meandering coils 28 and 30 formed on the front and back of the thin film 26,
respectively. Among them, the thin film 26 is, for example, a resin film having a thickness of
about 30 [μm] and flexibility. Examples of such resinous films include polyethylene
terephthalate films and aromatic polyimide films. Also, concave notches 32 and 34 are provided
in the center of the upper end edge and the lower end edge of the thin film 26, respectively.
[0021]
On the other hand, the coils 28 and 30 are, for example, copper foil patterns with a thickness of
20 μm to 50 μm formed by the printed wiring technology, and are in a mutually conjugate
relationship. Specifically, one end of the front side coil 28, for example, the upper end 36 in FIG.
3A, is a plus terminal as a first terminal, and the plus terminal 36 is a notch 32 on the upper side.
Near the side edge of the The other end 38 of the front side coil 28 is a minus terminal as a
second terminal portion, and the minus terminal 38 is provided in the vicinity of the side edge of
the notch 34 on the lower side. On the other hand, one end of the coil 30 on the back side, for
example, the end 40 on the upper side in FIG. 3B is a minus terminal as a second terminal, and
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this minus terminal 40 is an upper side. It is provided near the side edge of the notch 32. The
other end 42 of the coil 30 on the back side is a plus terminal as a first terminal portion, and the
plus terminal 42 is provided near the side edge of the notch 34 on the lower side. Furthermore,
in the coil 28 on the front side, a large number of straight portions provided so as to extend
along the horizontal direction and a large number of straight portions similarly provided in the
coil 30 on the back side Sandwiching, they overlap each other. The plus terminal 36 of the front
side coil 28 and the minus terminal 40 of the back side coil 30 face each other with the upper
side notch 32 therebetween, and the minus terminal 38 of the front side coil 28 The plus
terminal 42 of the coil 30 on the back side faces each other across the notch 34 on the lower
side.
[0022]
According to this conjugate relation, for example, when a current flows from the positive
terminal 36 of the front side coil 28 to the negative terminal 38 and a current flows from the
positive terminal 42 of the rear side coil 30 to the negative terminal 40 These currents will flow
in the same direction with one another in their respective straight sections. Also when current
flows from the negative terminal 38 of the front side coil 28 to the positive terminal 36 and
current flows from the negative terminal 40 of the rear side coil 30 to the positive terminal 42,
these currents are , Flows in the same direction in each straight line portion. In addition, while
the plus terminal 36 of the front side coil 28 and the minus terminal 40 of the back side coil 30
are viewed as one terminal group, the minus terminal 38 of the front side coil 28 and the back
side coil 30 When the plus terminal 42 is viewed as one terminal group, these terminal groups
are point-symmetrical to each other with respect to the center of the thin film 26. At the same
time, the respective terminal groups form line symmetry with respect to a straight line passing
through the center of the thin film 26 and parallel to the straight portions of the respective coils
28 and 30. In short, these terminal groups are arranged in a well-balanced manner in each of the
vertical and horizontal directions in FIG.
[0023]
Referring back to FIGS. 1 and 2, each of the buffer members 14 and 16 is a substantially
rectangular sheet having substantially the same size as the vibrating membrane 12 (thin film 26),
and is formed of a material having flexibility and air permeability. There is. Such materials
include, for example, non-woven fabrics. Further, the buffer member 16 positioned on the back
side of the vibrating membrane 12 is provided with a notch 44 (not shown for the lower notch)
similar to the vibrating membrane 12 (thin film 26).
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[0024]
The permanent magnet plates 18 and 20 each have an appropriate thickness, and the surface
thereof is a substantially flat plate slightly larger than the vibrating film 12, and for example, a
resin magnet or rubber magnet containing ferrite or rare earth magnetic powder. It is formed by
Then, although not shown in the figure, the surface of the permanent magnet plate 18 located on
the front side of the vibrating film 12 (with the buffer member 14 interposed therebetween)
faces the vibrating film 12 and the front side coil 28 described above A parallel-striped
multipolar magnetization pattern is formed in which the N pole and the S pole appear alternately
along the alignment direction of each straight line portion. More specifically, each boundary
between each N pole and each S pole of the multipolar magnetization pattern surface is taken as
a neutral zone, and these neutral zones face the respective straight portions of the front side coil
28. The multipole magnetization pattern is formed. Furthermore, a plurality of through holes 46,
46,... Are provided at appropriate positions on each neutral zone, for example, in a zigzag form so
as to penetrate the permanent magnet plate 18 from the front side to the back side. . The
configuration of the permanent magnet plate 18 including the multipolar magnetization pattern,
the positional relationship between the multipolar magnetization pattern and the front side coil
28, and the positions of the through holes 46, 46,... As it is similar to the prior art (Patent
Document 1), the detailed description thereof will be omitted.
[0025]
Similarly, with regard to the permanent magnet plate 20 positioned on the back side of the
vibrating membrane 12, a multipolar magnetized pattern is formed on the side facing the
vibrating membrane 12 (with the buffer member 16 interposed therebetween). Specifically, the
multipole magnetization pattern is formed such that the N pole and the S pole appear alternately
along the alignment direction of the linear portions of the back side coil 30. The neutral zones of
the back surface side multipolar magnetization pattern are opposed to the straight portions of
the back side coil 30. Furthermore, the multipolar magnetization pattern on the back side and the
multipolar magnetization pattern on the front side described above sandwich the vibrating
membrane 12 (and the buffer members 14 and 16) to each other's N poles and S poles. Are
formed to face each other. That is, the multipolar magnetization patterns are also in a mutually
conjugate relationship between the front side and the back side. A plurality of through holes 48,
48, ... are also provided on each neutral zone of the back surface side multipolar magnetization
pattern so as to penetrate the permanent magnet plate 20 from the front side to the back side. .
Furthermore, concave notches 50 and 52 (see, in particular, FIG. 1 (d)) are provided at the
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centers of the upper end edge and the lower end edge of the permanent magnet plate 20,
similarly to the buffer member 16.
[0026]
The front cover 22 is made of metal of high magnetic permeability such as an iron plate, and all
the components except the back plate 24 are accommodated in the inner space thereof. In
particular, the front permanent magnet plate 18 is fixed to the inner surface of the front cover
22 by its magnetic attraction force. The front cover 22 is also provided with through holes 54,
54,... At positions facing the through holes 46, 46,. Furthermore, on the rear side portion of the
side face of the front cover 22, a plurality of locking claws 58, 58,... Which are locked to the
respective notches 56, 56,. There is.
[0027]
The back plate 24 is also made of high magnetic permeability metal, and the locking claws 58,
58,... Of the above-mentioned front cover 22 are engaged with the cut portions 56, 56,. Thus, the
housing together with the front cover 22 is completed. At the same time, the permanent magnet
plate 20 on the back side is fixed to the inner surface of the back plate 24 by the magnetic
attraction force. At this time, a gap of a certain size, for example, a gap 59 of several [mm] is
provided between the permanent magnet plate 20 on the rear side and the permanent magnet
plate 18 on the front side described above. Then, in the gap 59, the vibrating membrane 12 and
the buffer members 14 and 16 intervene with an appropriate margin (play). Furthermore,
through holes 60, 60,... Are provided in the back plate 24 at positions facing the respective
through holes 48, 48,. Terminal blocks 62 and 64 are provided near the centers of the upper end
edge and the lower end edge of the back plate 24, respectively.
[0028]
Among them, the terminal block 62 on the upper side is connected to the upper side positive
terminal 66 connected to the positive terminal 36 of the front side coil 28 and the negative
terminal 40 on the rear side coil 30, as particularly shown in FIG. And an upper negative terminal
68. Note that these upper terminals 66 and 68 are both drawn out to the outside in a state of
being insulated from the back plate 24 (strictly speaking, they are connected to the
corresponding external terminals). The connection between each of the terminals 66 and 68 on
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the terminal block 62 side and each of the terminals 36 and 40 on the vibrating membrane 12
side is realized by an appropriate conductive wire such as a wire. The respective copper foil
patterns of the respective terminals 36 and 40 may be realized by being extended to the
respective terminals 66 and 68 on the terminal block 62 side. Then, in order to connect the
terminals 66 and 68 on the terminal block 62 side and the terminals 36 and 40 on the vibrating
film 12 side, the notch portion 50 is provided on the upper end edge of the permanent magnet
plate 20 on the back side as described above. In addition, a notch 44 is provided at the upper end
edge of the back side cushioning member 16, and a notch 32 is provided at the upper end edge
of the vibrating membrane 12 (thin film 26).
[0029]
On the other hand, the lower terminal block 64 has a lower negative terminal 70 connected to
the negative terminal 38 of the front side coil 28 and a lower positive terminal 72 connected to
the positive terminal 42 of the back side coil 30. doing. And these lower side terminals 70 and 72
are pulled out outside in the state insulated with back plate 24 all. The connection between each
of the terminals 70 and 72 of the lower terminal block 64 and each of the terminals 38 and 42
on the vibrating film 12 side is also realized by an appropriate conductive wire such as a wire.
The copper foil patterns of the respective terminals 38 and 42 may be realized by being
extended to the respective terminals 70 and 72 on the terminal block 64 side. Further, notches
52 are provided in the lower end edge of the permanent magnet plate 20 on the back side for
connecting the terminals 70 and 72 on the terminal block 64 side and the terminals 38 and 42
on the vibrating film 12 side, A notch (not shown) is provided at the lower end edge of the
cushioning member 16 on the back side, and a notch 34 is provided at the lower edge of the
vibrating membrane 12 (thin film 26).
[0030]
When the flat speaker 10 configured in this way is used with only one, it is in the form as shown
in FIG. That is, the upper terminals 66 and 68 are connected to each other by a suitable
conductive wire 74 such as a coated cable. By so doing, the front side coil 28 and the back side
coil 30 are connected in series with each other, as can be seen from FIG. 4 described above.
Then, the lower side terminals 70 and 72 are connected to external wiring (not shown). That is,
an audio signal is input between these terminals 70 and 72.
[0031]
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12
Thus, when an audio signal is input, a current according to the audio signal flows to each of the
front side coil 28 and the rear side coil 30. And, particularly in the straight sections of the
respective coils 28 and 30, the current flows in a direction transverse to the magnetic field at
right angles. Then, according to Fleming's left-hand rule, mechanical force along the thickness
direction of the vibrating membrane 12 (thin film 26) acts on the coils 28 and 30 at the same
time. Moreover, the direction in which the mechanical force acts is the same between the coils 28
and 30. That is, each coil 28 and 30 vibrates simultaneously and in the same direction. Then, the
vibrating film 12 vibrates accompanying the coils 28 and 30. As a result, sound waves are
generated. Specifically, on the front side, the respective through holes 46, 46,... Provided on the
front side permanent magnet plate 18 and the respective through holes 54, 54,. Sound waves are
emitted to the outside. And, on the back side, through the through holes 48, 48, ... provided in the
permanent magnet plate 20 on the back side and the through holes 60, 60, ... provided in the
back plate 24. , Sound waves are emitted to the outside.
[0032]
When a plurality of, for example, two flat speakers 10 and 10 are used, the mode is as shown in
FIG. That is, for one flat speaker 10, the upper terminals 66 and 68 are connected by appropriate
conductive lines 74, as shown in FIG. The lower negative terminal 70 of the flat speaker 10 and
the upper positive terminal 66 of another flat speaker 10 are connected by appropriate
conductive wires 76. Furthermore, the lower side plus terminal 72 of the flat loudspeaker 10 and
the upper minus terminal 68 of another flat loudspeaker 10 are connected by suitable
conductive lines 78. In this way, all the coils 28, 28, 30 and 30 are connected in series between
the planar speakers 10 and 10, respectively. In other words, an array speaker consisting of two
flat speakers 10 and 10 is realized. Then, external wirings (not shown) are connected to the
lower terminals 70 and 72 which are not connected to the other flat speaker 10.
[0033]
In the embodiment shown in FIG. 6, the connection between the flat speakers 10 and 10 is made
by connecting the lower terminals 70 and 72 (terminal block 64) on one side and the upper
terminals 66 and 68 (terminal block 66) on the other side. The work is extremely easy and
concise. It is also excellent in design. The same applies to the case where three or more flat
speakers 10, 10,... Are connected.
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[0034]
By the way, in the present embodiment, as shown in FIG. 4, the vibrating membrane 12 is
provided at the back plate 24 which is a housing via the terminal blocks 62 and 64 at two places
of the upper end side and the lower end side. It is fixed. The two fixed points form point
symmetry with each other about the center of the vibrating film 12 (thin film 26). In addition, the
two points form line symmetry with respect to a straight line passing through the center of the
vibrating membrane 12 and extending along the horizontal direction. As a result, the vibrating
membrane 12 is fixed to the housing 24 in a balanced state at the two places.
[0035]
On the other hand, in the above-mentioned prior art, for example, as shown in FIG. 7, the
vibrating membrane 100 is fixed to the housing via one terminal block 102, that is, at one place.
For this reason, in the said prior art, when the vibrating film 100 vibrates, flapping occurs. Note
that FIG. 7 illustrates the fixed state of the vibrating membrane 100 in an easy-to-understand
manner, following FIG. 4, and in FIG. 7, one coil is disposed only on one side of the thin film 103
as the main body of the vibrating membrane 100. The reference numeral 104 is formed in close
contact. And both ends 106 and 108 of this coil 104 are connected to two terminals 110 and
112 provided on the terminal block 102. Such a configuration is not clearly shown in the prior
art (Patent Document 1), but the same configuration is practically used in the prior art.
[0036]
Also in the prior art, as shown in FIG. 8, for example, the coils 120 and 122 may be formed on
both sides of the vibrating membrane 100 (thin film 103). However, in this case, in the prior art,
one end (upper end in FIG. 8) 124 and 126 of each coil 120 and 122 is connected to each
terminal 110 and 112 of the terminal block 102. Then, the other ends (lower ends in FIG. 8) of
the coils 120 and 122 are connected to each other through the through holes 130. That is, in the
prior art, even when the coils 120 and 122 are formed on both surfaces of the vibrating
membrane 100, the vibrating membrane 100 is fixed to the housing at only one place. Therefore,
flutter still occurs.
[0037]
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Furthermore, in the conventional diaphragm 100 shown in FIG. 8, the through hole 130 is
employed as a means for connecting the coils 120 and 122 in series, but the formation of the
through hole 130 has a corresponding cost. Hang. Therefore, when such a through hole 130 is
formed, the manufacturing cost of the vibrating membrane 100 naturally increases, which in
turn increases the price of the entire speaker. Also, instead of the through holes 130, the coils
120 and 122 may be connected in series, for example, by appropriate conductive wires such as
wires, in which case the wires also vibrate with the diaphragm 100 together. Become. In such a
case, the wire may be an unreasonable load on the vibrating membrane 100, which may
adversely affect the acoustic characteristics.
[0038]
On the other hand, in the present embodiment, the through hole 130 as shown in FIG. Also in
this respect, the present embodiment is advantageous as compared with the prior art.
[0039]
As described above, according to the present embodiment, the vibrating membrane 12 is fixed to
the housing 24 in a balanced state at two places. Therefore, unlike the prior art, the vibrating
film 12 does not flutter. Therefore, it is possible to obtain better acoustic characteristics than in
the past.
[0040]
In the present embodiment, the vibrating film 12 is displaced only in its thickness direction, and
not in its inner surface direction. This is because the peripheral edge of the vibrating film 12 is
restricted by the inner peripheral surface of the front cover 22. That is, the inner peripheral
surface of the front cover 22 functions as a restricting means that restricts (limits) the
displacement of the vibrating film 12 in the inner surface direction. On the other hand, in the
above-described prior art, the support rods are inserted into the holes provided at the four
corners of the vibrating membrane, thereby restricting the displacement of the vibrating
membrane in the inner direction (in particular, the prior art). Paragraph 0021)). Also in the
present embodiment, the displacement of the vibrating film 12 in the inner surface direction may
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be restricted in the same manner as in the prior art.
[0041]
Further, in the present embodiment, as the vibrating film 12, a roughly square shape is adopted,
but the present invention is not limited to this. For example, circular, elliptical, or polygonal
shapes such as hexagons and octagons may be employed. However, the vibrating film 12 has a
shape that can be fixed to the casing at two points in a balanced manner, that is, it has a point
symmetrical with respect to its own center and axisymmetrical with respect to a straight line
passing through the center Are preferred. Needless to say, when the shape of the vibrating film
12 is changed, the shapes of the other components such as the permanent magnet plates 18 and
20 are appropriately changed accordingly.
[0042]
Furthermore, in the present embodiment, each of the terminals 36, 38, 40 and 42 on the
vibrating membrane 12 side is connected to the terminals 66, 68, 70 and 72 on the respective
terminal blocks 62 and 64 side. Although 12 is fixed to the housing 24 via the terminal blocks
62 and 64, the invention is not limited thereto. For example, the vibrating membrane 12 may be
fixed to the housing 24 by another means such as a tape.
[0043]
As for the vibrating film 12, the front side coil 28 is provided with, for example, x-shaped
attached patterns 80, 80, ... as protrusions as shown in FIG. 9, and the back side coil 30 is
similarly attached. Patterns 80, 80, ... may be provided. Among them, the attached patterns 80,
80, ... on the front side are formed of a copper foil pattern together with the front side coil 28,
and the respective positions thereof are the respective through holes 46 provided in the
permanent magnet plate 18 on the front side. , 46, ... are aligned. On the other hand, the back
side attachment patterns 82, 82,... Are also formed by the copper foil pattern together with the
back side coil 30, and the respective positions are the respective through holes 48 provided in
the back side permanent magnet plate 20. , 48, ... are aligned. By providing such attached
patterns 80, 80, ... and 82, 82, ..., adhesion between the coil 28 and the thin film 26 in the
portion provided with the attached patterns 80, 80, ... and 82, 82, ... Force increases. This means
that the responsiveness of the vibrating thin film 26 attached to each of the coils 28 and 30 is
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improved in the portion where the attached patterns 80, 80, ... and 82, 82, ... are provided. On
the other hand, where the attached patterns 80, 80, ... and 82, 82, ... are provided, the weight
increases by the amount of the attached patterns 80, 80, ... and 82, 82, ... Also affect
responsiveness. That is, by providing the attachment patterns 80, 80, ... and 82, 82, ..., the
response of the entire vibrating membrane 12 changes, and thus the acoustic characteristics of
the entire flat loudspeaker 10 change. In other words, the attached patterns 80, 80, ... and 82,
82, ... function as control means for controlling the acoustic characteristics of the flat
loudspeaker 10 as a whole. Therefore, by appropriately forming these attached patterns 80, 80,
... and 82, 82, ..., better acoustic characteristics can be obtained. It should be noted that the
provision of such additional patterns 80, 80, ... and 82, 82, ... may affect the current flowing in
the respective coils 28 and 30. However, such a concern is useless because no current flows in
the attached patterns 80, 80, ... and 82, 82, ....
[0044]
Further, the attached patterns 80, 80, ... and 82, 82, ... may be ○ -shaped as shown in Fig. 10. Of
course, other shapes, for example, a square or a triangle may be used. Furthermore, the shapes of
the attached patterns 80, 80, ... and 82, 82, ... may be changed depending on the location of the
vibrating membrane 12, and the size and the number of the attached patterns 80, 80, ... and 82,
82, ... You may change the pitch). In any case, the attached patterns 80, 80, ... and 82, 82, ... may
be formed so as to obtain desired acoustic characteristics.
[0045]
In particular, as shown in FIG. 11, the attached patterns 80, 80,... On the front side and the
attached patterns 82, 82,. An effect like that is obtained. That is, as shown in FIG. 9 (or FIG. 10),
when the attached patterns 80, 80, ... and 82, 82, ... are provided at the same position on the
front side and the back side of the vibrating membrane 12, this attached pattern A large
difference occurs in the mechanical strength of the vibrating membrane 12 between the portion
where the 80, 80, ... and 82, 82, ... are provided and the portion that is not, and a weight
difference also occurs. In this case, when the vibrating membrane 12 vibrates, there is a
possibility that unintended distortion or bending may occur in the vibrating membrane 12 to
adversely affect the acoustic characteristics. On the other hand, in the configuration shown in
FIG. 11, the attached patterns 80, 80, ... on the front side and the attached patterns 82, 82, ... on
the back side are uniformly formed over the entire surface of the diaphragm 12. Therefore, the
mechanical strength is uniform over the entire surface of the diaphragm 12, and the weight is
also uniform. Therefore, the unintended distortion or deflection when the vibrating membrane 12
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vibrates is suppressed, and the unintended distortion or deflection particularly in the longitudinal
direction is suppressed. This greatly contributes to obtaining good acoustic characteristics.
[0046]
Furthermore, although the coils 28 and 30 are formed on both sides of the vibrating membrane
12 (thin film 26) in the present embodiment, the present invention is not limited to this. For
example, a coil may be formed only on one side of the diaphragm 12, or a plurality of coils,
strictly speaking, an even number of coils may be formed on the one side. When coils are formed
on both sides of the vibrating film 12, a plurality of coils may be formed on each of the both
sides. In this case, it is desirable that the number of coils be the same on both sides.
[0047]
DESCRIPTION OF REFERENCE NUMERALS 10 flat speaker 12 vibrating membrane 18, 20
permanent magnet plate 22 front cover 24 back plate 26 thin film 28, 30 coil 36, 38, 40, 42
terminal 62, 64 terminal block 66, 68, 70, 72 terminal
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