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JP2010268045

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DESCRIPTION JP2010268045
PROBLEM TO BE SOLVED: To provide a thin acousto-electro-mechanical transducer which can be
easily assembled as compared with the prior art and is excellent in design. SOLUTION: A flat
speaker 10 as a thin acoustic electromechanical transducer according to the present invention
has a pair of covers 22 and 24 as a housing, and four pins 26 and 26 are provided in the
housing. , ... are provided. The respective pins 26 are held by fitting their respective ends into the
fitting holes 34 and 36 provided in the permanent magnet plates 18 and 20, respectively. It
functions as a positioning jig for achieving positioning with the members 14 and 16, and after
assembly, functions as displacement control means for controlling the displacement direction of
the vibrating membrane 12. Further, since the pin 26 is in the state of being incorporated in the
housing, the design including the planarity of the housing is maintained. [Selected figure] Figure
2
Thin-type electro-mechanical transducer
[0001]
The present invention relates to a thin acousto-electromechanical transducer such as a flat
speaker.
[0002]
Conventionally, as a flat speaker, for example, one disclosed in Patent Literature 1 is known.
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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 Among them, a parallel stripe multipole
magnetization pattern in which strip-like N poles and S poles appear alternately is formed over
the entire surface of the permanent magnet plate on the side facing the vibrating membrane. In
the multipolar magnetization pattern surface, the vicinity of each boundary between each N pole
and each S pole is called a neutral zone, and a magnetic field from adjacent N poles to S poles so
as to cross this neutral zone Is formed. That is, the magnetic field is formed along the surface of
the vibrating film. On the other hand, the vibrating membrane is a thin and flexible resin film on
which a coil consisting of a meander-shaped conductor pattern is printed and printed, and the
linear portion of this coil corresponds to the position corresponding to the neutral zone of the
permanent magnet plate. In other words, the linear portion of the coil is supported by the
support member so as to extend in the direction crossing the magnetic field. The vibrating
membrane (resin film) is supported by the support member so as to be freely displaced in the
thickness direction (out-plane direction) although the displacement in the in-plane direction is
restricted. The buffer member has flexibility and air permeability and is a stack of sheets
approximately the same size as the vibrating membrane, and between the sheet and the
permanent magnet plate or between the sheet and the vibrating membrane. In order to form an
appropriate gap. The outer peripheral edge of each of the vibrating membrane and the buffer
member is in a so-called free state where it is not fixed at all.
[0003]
According to this configuration, when a drive current flows through 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, accompanying to this coil, the vibrating membrane
vibrates, and as a result, a sound wave is generated. The prior art is also applicable to a
microphone that performs the conversion operation opposite to that of the speaker.
[0004]
JP-A-9-331596
[0005]
By the way, in the above-mentioned prior art, the support member is specifically made of a
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combination of a support rod and a nut screwed to both ends thereof.
For example, referring to FIG. 1 of the related art (Patent Document 1), two permanent magnet
plates are provided to face each other at a predetermined distance from each other, and this
positional relationship is defined by the respective permanent magnet plates. The four corners
are held by being firmly fixed near the ends of the four support bars. Then, holes are bored at the
four corners of the vibrating membrane, and the support rods are inserted into the respective
holes. By this, the displacement in the in-plane direction of the vibrating membrane is regulated
with an accuracy of the order of microns, and the displacement in the thickness direction of the
vibrating membrane is made free. Similarly, in the buffer member, holes are formed at the four
corners, and the support rods are inserted through the respective holes.
[0006]
Furthermore, in the prior art (the configuration of FIG. 1), a high permeability magnetic plate for
preventing magnetic flux leakage is in close contact with the surface of each permanent magnet
plate opposite to the multipolar magnetization pattern surface. And, on the outer surface (surface
opposite to the surface to which the permanent magnet plate is in close contact) side of each of
the high magnetic permeability magnetic plates, a nut is screwed to both ends of each support
bar. That is, each high permeability magnetic plate also functions as a casing of a flat speaker.
The support rod and the nut function as so-called displacement control means for controlling the
displacement direction of the vibrating film as described above, and also function as coupling
means for mutually coupling the high permeability magnetic plates.
[0007]
However, in the prior art, both ends of the support bar and the nut are in a state of being
exposed (exposed) on the outer surface side of each high permeability magnetic plate as a
housing. This is because the support rod and nut function as displacement control means as
described above and also function as coupling means. As such, when there is a portion that
protrudes on the outer surface side of the housing, the planarity unique to the flat speaker is lost,
and the so-called designability is reduced. In addition, although the structure of one permanent
magnet board and the structure of three sheets are disclosed by FIG. 6 of a prior art, also in these
cases, it is the same.
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[0008]
Moreover, in the prior art, although not particularly clearly shown, since a dedicated jig is used at
the time of assembling the flat speaker, there are the following problems. That is, taking the
configuration of FIG. 1 of the related art as an example, at the time of assembling the flat
speaker, first, a jig provided with four positioning pins simulating the above-mentioned support
rod is placed on the workbench. Subsequently, the lower high magnetic permeability magnetic
plate is attached to the jig such that the positioning pins are inserted into the holes provided at
the four corners. Similarly to this, the lower permanent magnet plate, the lower buffer member,
the diaphragm, the upper buffer member, the upper permanent magnet plate, and the upper high
magnetic permeability magnetic plate are respectively arranged in this order. The positioning
pins are attached to the jigs so that the positioning pins are inserted into the holes provided at
the four corners of the. After the components are positioned as described above, the jig including
the positioning pins is removed so that the positional relationship between the components is not
broken. That is, each positioning pin is pulled out from each hole of each component. Then, in
place of the positioning pins, the support rods are inserted into the holes, and nuts are screwed
into both ends of the support rods. Thus, in the prior art, each component is positioned using a
jig including each positioning pin, and then the jig is removed, and instead, each support rod and
nut are attached. Because this assembly work is very troublesome. Moreover, considerable
attention is required to prevent the positional relationship between the components from being
broken.
[0009]
Then, an object of the present invention is to provide a thin acousto-electromechanical
transducer which can be easily assembled as compared with the prior art and is excellent in
design.
[0010]
In order to achieve this object, the present invention comprises a housing having two flat plate
portions facing each other at a distance from each other, and one or more rod-like members
provided so as to bridge between the two flat plate portions. The rod-like body has an insertion
hole through which the rod-like body is inserted, and is displaceable along the extending
direction of the rod-like body in a state of facing the inner surface of each flat plate portion. And
a vibrating membrane whose displacement is regulated.
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A magnetic field in the direction along the surface of the vibrating membrane is formed in the
space sandwiched by each flat plate portion, and a coil having a portion extending in the
direction crossing the magnetic field is attached to the surface of the vibrating membrane A thin
acousto-electromechanical transducer that converts one of the current flowing in the coil and the
mechanical force acting on the coil into the other is assumed. Under this premise, a holding
means is provided on the inner surface side of each flat plate portion and holds the end of the
rod-like body. And it further comprises a connecting means which is provided separately from
the holding means, and which constitutes a housing by mutually connecting a pair of structures
including the flat portions individually.
[0011]
According to this configuration, for example, when current flows in the coil, mechanical force
along the thickness direction of the vibrating membrane, in other words, the extending direction
of the rod-like body, acts on the coil according to Fleming's left-hand rule. Then, accompanying to
this coil, the vibrating membrane vibrates, and as a result, a sound wave is generated. In other
words, a converter for converting electric energy, which is current, into mechanical energy,
which is mechanical force, and thus, sound waves, that is, a so-called speaker is realized.
Conversely, when the vibration film vibrates along the thickness direction due to the sound wave
striking the vibration film, the coil also vibrates accordingly. As a result, current flows in the coil
according to Fleming's right-hand rule. In other words, a transducer for converting mechanical
energy resulting from sound waves into electrical energy, a so-called microphone, is realized.
[0012]
By the way, in the present invention, by inserting the rod-like body into the insertion hole of the
vibrating membrane, the displacement of the vibrating membrane in the direction crossing the
extension direction of the rod-like body, that is, the in-plane direction of the vibrating membrane
is restricted. Be done. On the other hand, the vibrating membrane is displaceable in the extending
direction of the rod-like body, that is, in the thickness direction of the vibrating membrane. In
short, the rod-like body functions as a displacement control means for controlling the
displacement direction of the vibrating membrane together with the insertion hole of the
vibrating membrane. As described above, the diaphragm can be displaced only in its thickness
direction, and the displacement in the in-plane direction is restricted, whereby good acoustic
characteristics can be obtained.
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[0013]
Here, the end portions of the rod-like members are in a state of being held by the holding means
provided on the inner surface side of each flat plate portion. In other words, the end of the rodlike body is configured so as not to be exposed to the outer surface side of the housing including
the flat portions. At the same time, the housing is formed by joining together a pair of structures
including the flat portions individually, and the coupling means for coupling the pair of
structures is provided separately from the holding means. In other words, the coupling means is
separate from the rod-like body that functions as displacement control means. Therefore, in the
prior art described above, since the support rod and nut functioning as displacement control
means also function as coupling means, both ends of the support rod and the nut are projected to
the outer surface side of the housing. According to the invention, there is no such protrusion
(strictly speaking, by adopting appropriate coupling means, a configuration in which the
protrusion is not present can be realized).
[0014]
Furthermore, the rod-like body in the present invention also functions as a jig for positioning
each component including the vibrating film at the time of assembly of the thin-type acoustoelectro-mechanical transducer. Specifically, at the time of the assembly, first, one end of the rodlike body is held by the holding means provided on one of the structures (flat plate portion). In
this state, the rod-like body is inserted into the insertion hole of the vibrating membrane from the
other end side, whereby the positioning of the vibrating membrane is achieved. After this
positioning, the other structure is coupled with one of the structures by the coupling means such
that the other end of the rod is held by the holding means provided in the other structure. After
this, the rod-like body functions as displacement control means as described above. That is, in the
above-described prior art, a dedicated jig is used at the time of assembly, and then the jig is
removed, and instead, a support rod and a nut as displacement control means are mounted,
According to the present invention, the rod-shaped body which functions as a jig at the time of
assembly functions as a displacement control means as it is, in a state in which the rod-shaped
body is built in the housing.
[0015]
In the present invention, the holding means is provided with a fitting hole provided directly or
indirectly on the inner surface of each flat plate portion, and the end portion of the rod-like body
is fitted to this fitting hole. The end of the rod-like body may be held.
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[0016]
Further, when the above-mentioned magnetic field is formed by a substantially flat magnet plate
and this magnet plate is in close contact with the inner surface of at least one flat plate portion,
the magnet plate is provided with a fitting hole. It may be done.
[0017]
Furthermore, it is desirable that the insertion hole of the vibrating membrane be located near the
periphery of the vibrating membrane.
In particular, when the shape of the vibrating membrane is a quadrangle, it is desirable that the
insertion holes be located at the four corners.
That is, the vicinity of the peripheral edge of the vibrating membrane does not greatly contribute
to the mutual conversion action between the sound wave and the vibration as compared to the
portion near the center of the vibrating membrane. Therefore, by providing the insertion hole in
the vicinity of the peripheral edge of such a vibrating membrane, the displacement in the
thickness direction can be controlled while restricting the displacement of the vibrating
membrane in the in-plane direction without significantly affecting the acoustic characteristics.
The action by the combination of the insertion hole and the rod-like body, which makes it
possible, is exhibited well.
[0018]
Also, the vibrating membrane may be connected to a terminal fixed to the housing. For example,
the end of the coil of the diaphragm corresponds to this. In this case, an insertion hole may be
provided in a portion other than the connection portion between the vibrating membrane and the
terminal. That is, the vibrating membrane is fixed to the housing at the connection portion. Then,
in this connection portion, at least the displacement of the vibrating membrane in the in-plane
direction is restricted. Therefore, it is not necessary to provide an insertion hole in such a
connection portion, and therefore, it is sufficient to provide an insertion hole in a portion other
than the connection portion. And according to this penetration hole, a rod-shaped body is also
suitably provided.
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[0019]
As described above, in the prior art, a dedicated jig is used at the time of assembly, and then the
jig is removed, and instead, a support rod and a nut as displacement control means are attached.
According to the present invention, the rod-like body functioning as the same jig at the time of
assembly functions as the displacement control means as it is. Also, in the prior art, both ends of
the support bar and the nut protrude on the outer surface side of the housing, but according to
the present invention, such a protrusion does not exist. As is clear from the above, according to
the present invention, it is possible to provide a thin acousto-electro-mechanical transducer
which is easy to assemble and is excellent in design as compared with the prior art.
[0020]
It is a figure which shows schematic structure of the flat speaker which concerns on one
Embodiment of this invention. It is an assembly procedure figure of the same plane speaker. It is
an illustration figure which shows another example of the same plane speaker. It is an illustration
figure which shows the improvement example of the same plane speaker.
[0021]
One embodiment of the flat speaker 10 to which the present invention is applied will be
described below.
[0022]
As shown in FIG. 1, the flat speaker 10 according to the present embodiment is a flat,
substantially rectangular parallelepiped in appearance.
Then, structurally, as shown in the assembly procedure diagram of FIG. 2 (in particular, FIG. 2
(h)), one vibrating membrane 12 and the front side provided so as to sandwich both sides of this
vibrating membrane 12 Buffer member 14 and back surface buffer member 16, front permanent
magnet plate 18 and rear permanent magnet plate 20 provided so as to further sandwich these
buffer members 14 and 16 from the outside, and front cover as a housing 22 and a back side
cover 24.
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[0023]
Among them, the vibrating film 12 is the same as that in the above-mentioned prior art, so
detailed illustration is omitted, but a flexible thin film having a substantially rectangular shape
and a meandering coil closely formed on the surface of the thin film. And consists of Here, as the
thin film, for example, a film made of a resin such as polyethylene terephthalate or aromatic
polyimide having a thickness dimension of about 30 [μm] is adopted. On the other hand, the coil
is a conductor pattern such as copper foil formed by, for example, printed wiring technology, and
its thickness dimension is determined by the target nominal impedance, for example, in the range
of 20 μm to 50 μm. It is decided appropriately. Furthermore, at four corners of the vibrating
film 12, four insertion holes 28, 28,... Through which four cylindrical pins 26, 26,. Each pin 26 is
formed of a nonmagnetic material such as austenitic stainless steel, and the surface thereof is
polished smoothly. Further, each insertion hole 28 is a circular hole, and the inner diameter
thereof is slightly larger (for example, several tens μm to several hundreds μm) than the outer
diameter of the pin 26.
[0024]
The front side cushioning member 14 is a sheet-like member whose surface has substantially the
same shape and size as the surface of the vibrating film 12 (thin film), and is formed of a flexible
and air-permeable material such as a non-woven fabric. . Further, similarly to the vibrating film
12, four circular insertion holes 30, 30,..., In which the pins 26, 26,.
[0025]
The rear cushioning member 16 is basically of the same standard as the front cushioning
member 14, and four insertion holes 32, 32,... Are formed at the four corners of the rear
cushioning member 16. These buffer members 14 and 16 are not limited to the non-woven
fabric, and may be a stack of a plurality of sheets similar to those in the above-mentioned prior
art.
[0026]
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The front side permanent magnet plate 18 is also similar to that in the prior art, so detailed
illustration is omitted, but its surface is substantially the same shape and size as the surface of
the vibrating membrane 12 and a substantially flat plate having an appropriate thickness. It is
The front side permanent magnet plate 18 is formed of, for example, a resin magnet or a rubber
magnet containing ferrite or rare earth magnetic powder, and the surface on the side facing the
diaphragm 12 (on the front side shock absorbing member 14) A parallel stripe multipolar
magnetization pattern in which strip-like N and S poles appear alternately is formed over the
entire surface. In this multipolar magnetization pattern surface, each boundary between each N
pole and each S pole is a neutral zone, and a magnetic field is formed from adjacent N poles to S
poles so as to cross this neutral zone. It is done. That is, the magnetic field is formed along the
surface of the vibrating film. Here, a meandering coil is formed on the surface of the vibrating
film 12 as described above, but the straight portion of this coil faces the neutral zone, in other
words, the straight portion crosses the magnetic field. The positional relationship between these
coils and the neutral zone is set to extend. Furthermore, a plurality of circular through holes
serving as sound wave emission holes are formed at appropriate positions on each neutral zone,
for example, in a zigzag form so as to penetrate the front side permanent magnet plate 18 from
the front side to the back side. It is set up. Further, at the four corners of the front side
permanent magnet plate 18, the respective ends of the above-mentioned pins 26, 26,... Are fitted
so as to penetrate the front side permanent magnet plate 18 from the front side to the back side.
Four circular fitting holes 34, 34, ... are drilled.
[0027]
The back side permanent magnet plate 20 is basically the same standard as the front side
permanent magnet plate 18, and four fitting holes 36, 36, ... are also formed at the four corners
of the back side permanent magnet plate 20. It is done. Although not shown, a plurality of
through holes as sound wave emitting holes are also formed in the back side permanent magnet
plate 20. The multipolar magnetization pattern is formed on the surface of the back side
permanent magnet plate 20 facing the vibrating film 12 (with the back side buffer member 16
interposed therebetween).
[0028]
The front cover 22 is made of metal of high magnetic permeability such as an iron plate, and has
a substantially rectangular hollow portion 38 whose one surface is open (see particularly FIG. 2
(g)). Such a front cover 22 is formed, for example, by punching, bending or drawing. Then, in the
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hollow portion 38 of the front side cover 22, the front side permanent magnet plate 18 has its
back surface (surface opposite to the multipolar magnetization pattern surface) the inner surface
(hollow portion 38 of the front side cover 22). Is housed in close contact with the The inner
surface of the front cover 22 and the back surface of the front permanent magnet plate 18 are
firmly in close contact with each other by the magnetic attraction force of the front permanent
magnet 18 itself. Further, the front cover 22 is also provided with a plurality of circular through
holes 40, 40,... As the same sound wave emission holes so as to face the sound wave emission
holes of the front side permanent magnet plate 18. Furthermore, a plate-like flange 42 is
provided on the periphery of the opening side of the hollow portion 38 of the front cover 22 so
as to protrude outward. Although not shown in detail, at the four corners of the flange 42, four
circular through holes are formed as screw insertion holes through which four screws (male
screws) 44, 44, ... as coupling means are inserted. It is done.
[0029]
The back side cover 24 is basically of the same standard as the front side cover 22, and the back
side permanent magnet plate 18 is provided in the hollow portion 46 (see particularly FIG. 2A) of
the back side cover 24. It accommodates in the state which closely_contact | adhered the back
surface to the inner surface (the back surface of the hollow part 46) of the said back surface side
cover 24. FIG. Although not shown, a plurality of through holes as sound wave emitting holes are
also formed in the back side cover 24. Further, at four corners of the flange 48 of the back side
cover 24, four screw holes (female screws) into which the above-mentioned screws 44, 44,... Are
screwed are provided.
[0030]
According to the flat speaker 10 configured as described above, when a drive current flows
through the coil of the diaphragm 12, the thickness direction of the diaphragm 12, that is, the
respective pins 26, 26,. A mechanical force along the drawing direction acts on the coil. Then, the
vibrating film 12 (thin film) vibrates accompanying the coil. As a result, sound waves are
generated, and in detail, the sound waves are emitted to the outside through the sound emission
sounds including the through holes 40, 40, ... of the front cover 22 described above.
[0031]
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When the vibrating film 12 vibrates, the vibrating film 12 may collide with the permanent
magnet plates 18 and 20 to generate noise (abnormal sound). However, since flexible buffer
members 14 and 16 intervene between the vibrating film 12 and the permanent magnet plates
18 and 20, the generation of the noise is prevented. Further, there is a concern that the buffer
members 14 and 16 intervene to inhibit the emission of sound waves to the outside, but as
described above, the buffer members 14 and 16 also have air permeability. There is no such
concern. On the other hand, since the buffer members 14 and 16 also function as dustproof
filters, the entry of dust into the flat speaker 10 from the outside is also prevented.
[0032]
By the way, in order to obtain good acoustic characteristics, it is ideal that the vibrating film 12 is
restricted in displacement in the in-plane direction, and vibrates only in the thickness direction.
For this purpose, insertion holes 28, 28, ... are provided at four corners of the vibrating film 12,
and pins 26, 26, ... are inserted in the insertion holes 28, 28, .... The displacement of the vibrating
membrane 12 in the in-plane direction may be several dozen [μm] to several hundred [above]
depending on the dimensional difference between the inner diameter of the insertion holes 28,
28, ... and the outer diameter of the pins 26, 26, .... It is regulated with an accuracy of micron
order of [μm]. Further, for example, as shown in FIG. 1C, since the outer peripheral edge of the
vibrating membrane 12 is in a so-called free state without any contact, the outer peripheral edge
of the vibrating membrane 12 is the inner surface of each cover 22 and 24. Also, the generation
of contact noise (noise) due to contact with the object is suppressed.
[0033]
Here, with reference to FIG. 2 again, the assembly procedure of the flat loudspeaker 10 of the
present embodiment will be described.
[0034]
First, as shown in FIG. 2A, the rear cover 24 is placed (placed) on a work bench (not shown) with
the open side of the hollow portion 46 facing upward.
Then, as shown in FIG. 2 (b), the back side permanent magnet plate 18 is housed in the hollow
portion 46 of the back side cover 24 with its multipolar pole magnetization pattern surface
directed upward. . At this time, as described above, the back side permanent magnet plate 18 is
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firmly fixed in the hollow portion 46 of the planar cover 24 by its own magnetic attraction force.
Further, as shown in FIG. 2C, one pin 26 is attached to each of the fitting holes 36, 36, ... of the
back side permanent magnet plate 20, and one end of the pin 26 is fitted in detail. .
[0035]
Subsequently, as shown in FIG. 2 (d), the back side buffer member 16 is placed on the back side
so that the pins 26, 26,... Are inserted into the insertion holes 32, 32,. It is mounted on the side
permanent magnet plate 18 (multipolar magnetization pattern surface). Similarly, as shown in
FIG. 2 (e), the back surface of the vibrating film 12 is inserted so that the pins 26, 26,... Are
inserted into the insertion holes 28, 28,. It is mounted on the side buffer member 16.
Furthermore, as shown in FIG. 2 (f), the vibrating film is such that the pins 26, 26,... Are inserted
into the insertion holes 30, 30,. Mounted on 12
[0036]
On the other hand, as shown in FIG. 2 (g), in the hollow portion 38 of the front side cover 22, the
front side permanent magnet plate 18 has its multipolar magnetization pattern surface directed
to the opening side of the hollow portion 38. It is accommodated in the state. The front cover 22
is coupled to the rear cover 24 so that the opening side of the hollow portion 38 matches the
opening side of the hollow portion 46 of the rear cover 24. At this time, as shown in FIG. 2 (h),
the other ends of the pins 26, 26,... Are fitted in the fitting holes 34, 34,. Then, the front cover 22
and the back cover 24 are firmly coupled by the four screws 44, 44,... As the coupling means
described above, and the flat speaker 10 is completed.
[0037]
As can be understood from this series of assembly procedures, at the time of assembly, the pins
26, 26, ... function as a kind of jig for realizing the positioning of the vibrating membrane 12 and
the buffer members 14 and 16. . After assembly, as described above, the pins 26, 26,... Function
as displacement control means for controlling the displacement direction of the vibrating
membrane 12. That is, at the time of assembly, a jig including each positioning pin is used, and
then the jig is removed, and instead, a support rod and a nut as displacement control means are
attached, and the above-mentioned prior art However, each pin 26, 26, ... in this embodiment is
in a state of being built in the housing. Therefore, according to this embodiment, the assembling
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operation is easier than in the prior art.
[0038]
Further, in the above-mentioned prior art, in order that the support rod and the nut as
displacement control means also function as a coupling means for coupling the housing, both
ends of the support rod and the nut are protruded on the outer surface side of the housing In this
state, according to the present embodiment, since the pins 26, 26, ... as the displacement control
means and the screws 44, 44, ... as the coupling means are provided separately from each other,
such protrusion There is no department. Therefore, unlike the prior art which has the said
projection part, according to this embodiment, the planarity of the flat speaker 10 is maintained,
ie, the designability improves. Although an array speaker system may be configured by a
combination of a plurality of flat speakers 10, the design of the array speaker system is
maintained as a whole. Moreover, in the prior art, the protrusion becomes an obstacle during the
array system formation (assembly), but in the present embodiment, there is no such obstacle, so
the array system formation Workability improves.
[0039]
As described above, according to the present embodiment, it is possible to realize the flat speaker
10 which is easy to assemble and is excellent in design as compared with the above-described
prior art. In addition, when the flat speaker 10 is driven after assembly is completed, the
displacement in the thickness direction of the diaphragm 12 is properly secured, and the
displacement in the in-plane direction of the diaphragm 12 is accurately regulated. Good acoustic
characteristics are obtained.
[0040]
In the present embodiment, the pins 26, 26, ... have a cylindrical shape, but the present invention
is not limited to this. These pins 26, 26,... May be rod-shaped, and may be, for example, prismatic.
However, the fitting holes 34, 34, ... and 36, 36, ... of the permanent magnet plates 18 and 20,
and the insertion holes 28, 28 of the vibrating membrane 12 according to the shape of the pins
26, 26, ... The shapes of the insertion holes 30, 30, ..., 32, 32, ... of the buffer members 14 and 16
are also determined. In addition, if pins made of hard resin (so-called engineering plastic) such as
Delrin (registered trademark: polyacetal resin) are adopted as the pins 26, 26,.
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[0041]
Furthermore, the vibrating film 12 is not limited to a rectangular shape, and may have a circular
shape, an elliptical shape, or a polygonal shape other than a rectangular shape. However, in any
case, it is desirable that the insertion holes 28, 28,... Be provided in the vicinity of the peripheral
edge of the vibrating membrane 12. And, needless to say, according to the position and the
number of the insertion holes 28, 28, ..., the above-mentioned pins 26, 26, ... and the respective
fitting holes 34, 34, ... of the permanent magnet plates 18 and 20 and 36 , 36,..., And the
insertion holes 30, 30,..., 32, 32,.
[0042]
For example, as shown in FIG. 3, the vibrating membrane 12 is a terminal 52 fixed to the housing
(the flange 48 of the back side cover 24 in FIG. 3) via a suitable conductive wire such as the
wires 50 and 50. And 52 may be connected. That is, the ends 54 and 54 of the coil hit this. In
this case, the vibrating membrane 12 is fixed to the housing 24 at the connection portion
between the ends 54 and 54 of the coils and the terminals 52 and 52. Then, at this connection
portion, at least the displacement of the vibrating membrane 12 in the in-plane direction is
restricted. Therefore, it is not necessary to provide the insertion hole 28 in such a connection
portion. Therefore, the two insertion holes 28 and 28 may be provided only in two parts other
than the connection part, for example, along the side opposite to the connection part. In this way,
the number of pins 26 can be reduced and cost can be reduced. Also in this case, the fitting holes
34, 34, ... and 36, 36, ... of the permanent magnet plates 18 and 20, the insertion holes 30, 30, ...,
32, 32, ... of the buffer members 14 and 16, respectively The position and the number of
[0043]
Although screws 44, 44,... Are employed as coupling means for coupling the covers 22 and 24 as
a pair of structural bodies to each other, the present invention is not limited thereto. For example,
caulking, appropriate welding such as spot welding, or a suitable adhesive may be employed as
the bonding means. It should be noted that the flanges 42 and 48 of the covers 22 and 24 may
not be necessary, depending on what coupling means are employed.
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[0044]
In addition, at the extreme, one or both of the covers 22 and 26 may be absent. In this case, one
or both of the permanent magnet plates 18 and 20 doubles as a housing. For example, in the
case where the front side permanent magnet plate 18 also serves as a housing, the fitting holes
36 are provided from the multipolar magnetization pattern surface side to such an extent that
the front side permanent magnet plate 18 is not penetrated. The same applies to the case where
the back side permanent magnet plate 20 doubles as a housing.
[0045]
Further, although the configuration of one permanent magnet plate and the configuration of
three permanent magnet plates are disclosed in FIG. 6 of the prior art described above, the
present invention can be applied to such a configuration as well. That is, in any of the
configurations, the ends of the pins 26, 26,... Are fitted to the inner surface side so that the ends
of the pins 26, 26,. A fitting hole of the above may be provided.
[0046]
Furthermore, in order to improve the slidability between the outer surface of each pin 26 and the
inner surface of the insertion hole 28 of the vibrating membrane 12 inserted therethrough, for
example, as shown in FIG. The inner surface may have a thickness, and more specifically, a sleeve
60 may be provided. Such a sleeve 60 is realized by, for example, a through hole by the printed
wiring technology described above. In particular, coils may be formed on both sides of the
vibrating membrane 12 and the coils on both sides may be connected to each other by through
holes. In such a case, through holes as the sleeve 60 are formed together. And very useful.
[0047]
In the present embodiment, the planar speaker 10 has been described as an example, but the
present invention can be applied to a microphone that exerts a conversion action reverse to this.
[0048]
Reference Signs List 10 flat speaker 12 vibrating membrane 22 front side cover 24 back side
cover 26 pin 28 insertion hole 34, 36 fitting hole
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