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JP2008028812

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DESCRIPTION JP2008028812
PROBLEM TO BE SOLVED: To provide a flat thin speaker which is high in efficiency, hardly
causes divided vibration, obtains flat frequency characteristics, and hardly causes an operation
failure. SOLUTION: A bobbin of a speaker vibrating member defines an outer peripheral plane
fixed to a flat diaphragm, a plurality of rectangular grooves which are extended downward from
the outer peripheral plane and are fitted and housed with rectangular coils, and a rectangular
groove A plurality of rectangular flat surfaces connecting internal spaces and fixed to a flat
diaphragm, and the outer peripheral flat surface portion of the bobbin, the rectangular groove,
and the rectangular flat surface are integrally molded by forming a transparent resin film mainly
composed of polycarbonate. An adhesive which is formed into the rectangular groove of the
bobbin, which fills the rectangular groove of the bobbin, and which fixes the rectangular coil, the
bobbin, and the flat vibration plate, is an ultraviolet curable adhesive. [Selected figure] Figure 1
Speaker vibrating member, method of manufacturing the same, and speaker using the same
[0001]
The present invention relates to a speaker vibrating member using a plurality of coils, a method
of manufacturing the same, and a speaker including the same and a magnetic circuit using the
same and a plurality of magnets, and more particularly to a flat thin speaker having a thin overall
height.
[0002]
In an electrodynamic speaker that converts an audio signal to an audio, there is a speaker that
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adopts a flat diaphragm in order to keep its entire height including a magnetic circuit low.
Although the flat type diaphragm has a lower overall height compared to a cone type diaphragm,
its rigidity tends to be insufficient for integral vibration without division vibration. Therefore,
there is a speaker that attempts to suppress divided vibration by providing a plurality of voice
coils on a planar diaphragm and driving the planar diaphragm with a plurality of voice coils.
Conventionally, as a flat thin speaker having a thin overall height, a speaker provided with a flat
diaphragm provided with a plurality of coils and a magnetic circuit using a plurality of magnets
corresponding to each coil may be used.
[0003]
Among them, there is a flat thin speaker in which a plurality of coils are directly formed on an
insulating film which doubles as a flat diaphragm (Patent Document 1). By arranging a plurality
of magnets so that their magnetic polarities are different from each other, that is, adjacent
magnets appear mutually with, for example, N pole, S pole, N pole, S pole on the upper side By
arranging in this way, magnetic lines of force flying between different poles cross over the coils
on the flat diaphragm placed above the magnet. Therefore, when an audio signal current is
supplied to the coil, the flat diaphragm of the speaker vibrates under the driving force, and the
speaker reproduces the sound. However, when the flat diaphragm of the insulating film vibrates,
it makes a noise when it contacts the magnet. Therefore, if the insulating film and the magnet are
separated, the magnetic flux density at the position of the coil is significantly reduced. There is a
problem that it becomes low. In addition, since the rigidity of the insulating film is low, there is
also a problem that divided vibration occurs and flat frequency characteristics can not be
obtained.
[0004]
On the other hand, as a flat thin speaker with a thin overall height, there is a speaker in which a
plurality of coils are disposed in deep grooves provided in a flat diaphragm having asperities, and
the coils are disposed in magnetic gaps formed between a plurality of magnets (Patent Document
1 2). Here, each coil is formed by separating the coil wound around the track type in the
separation step, and this is loaded and adhered to the flat diaphragm. There is also a flat speaker
provided with a bobbin formed by vacuum forming a thin plastic plate and inserting a coil into
the slit of the bobbin (Patent Document 3). Since these arrange | position a coil in the place with
the highest magnetic flux density of the magnetic space | gap of a magnetic circuit, they can raise
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the efficiency of a planar speaker. However, in order to form a bobbin for arranging a plurality of
coils in a magnetic gap in a flat thin speaker having a thin overall height, it is necessary to make
the bobbin light in weight and have a rigidity for good sound reproduction. .
[0005]
When the coil disposed in the deep groove of the bobbin is fixed to the bobbin, for example,
when an adhesive containing a solvent such as an acrylic or rubber adhesive is used, the solvent
blocked in the deep groove and the diaphragm is used. As the coil remains without being
vaporized, the deep groove of the bobbin expands due to the pressure of the vaporized solvent
and comes into contact with the magnetic gap when the coil generates heat, causing a problem of
operation failure. Conventionally, there is a speaker in which a bobbin of a coil and a transparent
diaphragm are bonded with a visible light curing adhesive (Patent Document 4).
[0006]
JP-A-2001-333493 JP-A-60-18098 JP-A-63-299500 JP-A-2002-218597
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to achieve high efficiency, less occurrence of divided vibration, flat frequency
characteristics, and malfunction. It is an object of the present invention to provide a speaker
vibrating member that can provide a flat thin speaker that is hard to occur, and to realize a flat
thin speaker provided with this speaker vibrating member.
[0008]
The speaker vibrating member according to the present invention is a speaker vibrating member
including a flat diaphragm, a bobbin fixed to the back of the flat diaphragm, and a plurality of
rectangular coils fixed to the bobbin, the bobbin being fixed to the flat diaphragm An outer
peripheral surface; a plurality of rectangular grooves extending downward from the outer
peripheral surface for receiving and accommodating rectangular coils; and a plurality of
rectangular flat surfaces for connecting internal spaces defined by the rectangular grooves and
securing the flat diaphragm. And the outer peripheral flat surface portion of the bobbin, the
rectangular groove, and the rectangular flat surface are integrally formed by forming a
transparent resin film mainly composed of polycarbonate, filling the rectangular groove of the
bobbin, and forming a rectangular coil An adhesive that fixes the bobbin and the flat diaphragm
is a UV curable adhesive.
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[0009]
Preferably, in the speaker vibrating member according to the present invention, two adjacent
rectangular grooves of the bobbin form a common groove sharing one side thereof, and one side
of each of two adjacent rectangular coils is arranged together in the common groove Ru.
[0010]
More preferably, in the speaker vibrating member according to the present invention, a plurality
of common grooves formed in the bobbin are connected to form a connection groove crossing
the inside of the outer peripheral plane, and the ultraviolet curable adhesive is solidified by filling
the connection grooves. The agent forms a reinforcing rib that reinforces the flat diaphragm from
the back.
[0011]
In addition, preferably, the speaker vibrating member of the present invention is connected to an
edge joined to the outer peripheral portion of the flat diaphragm and to an input end and an
output end of a plurality of mutually connected rectangular coils, and on an outer peripheral
plane of a bobbin And further comprising a tinsel wire to be fixed.
[0012]
In the speaker according to the present invention, the speaker vibrating member described
above, a plurality of magnets each having a rectangular plate crowned thereon, and a frame
including a plate portion in which a plurality of magnets are arranged such that their polarities
differ from each other A speaker comprising: a bobbin of a speaker vibrating member mounted
on a frame, wherein a plurality of rectangular coils are disposed in a magnetic air gap defined
between adjacent rectangular plates or between adjacent rectangular plates and the frame .
[0013]
Preferably, in the method of manufacturing a speaker vibrating member according to the present
invention, the method of manufacturing a speaker vibrating member according to the abovementioned, wherein a plurality of rectangular coils are fitted and stored in rectangular grooves of
a bobbin; Filling the rectangular groove with an adhesive and applying an ultraviolet curable
adhesive to the outer peripheral flat surface of the bobbin and the rectangular flat surface, and
placing the flat diaphragm on the outer peripheral flat surface of the bobbin and rectangular flat
surface And a step of bringing the flat diaphragm and the bobbin into close contact, and a step of
irradiating the bobbin with ultraviolet light from the back side of the flat vibration plate and
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curing the ultraviolet curable adhesive.
[0014]
Preferably, in the method of manufacturing a speaker vibrating member according to the present
invention, the step of fitting and storing a plurality of rectangular coils in the rectangular groove
of the bobbin, the plurality of rectangular coils are mutually connected, and the input end and
the output thereof. The steps of connecting the tinsel wire to the end, filling the rectangular
groove with the ultraviolet curable adhesive, and applying the ultraviolet curable adhesive to the
outer peripheral flat portion of the bobbin and the rectangular plane, one end of the tinsel wire
Fixing the flat diaphragm to the outer peripheral flat surface of the bobbin, placing the flat
diaphragm on the outer peripheral flat portion of the bobbin and the rectangular flat surface, and
bringing the flat diaphragm and the bobbin into close contact; The method includes the steps of:
irradiating the bobbin with ultraviolet light to cure the ultraviolet curable adhesive; and bonding
the edge to the outer peripheral portion of the planar diaphragm.
[0015]
Hereinafter, the operation of the present invention will be described.
[0016]
A speaker vibrating member according to the present invention includes a flat diaphragm, a
bobbin fixed to the back surface of the flat diaphragm, and a plurality of rectangular coils fixed to
the bobbin.
The bobbin connects the outer circumferential surface fixed to the flat diaphragm, the plurality of
rectangular grooves extending downward from the outer circumferential surface and receiving
the rectangular coil by fitting, and the inner space defined by the rectangular grooves to form a
flat surface. And a plurality of rectangular planes fixed to the diaphragm.
The outer peripheral flat surface portion of the bobbin, the rectangular groove, and the
rectangular flat surface are integrally formed by molding a transparent resin film mainly
composed of polycarbonate, filling the rectangular groove of the bobbin, and a rectangular coil, a
bobbin, The adhesive that adheres to the flat diaphragm is a UV curable adhesive.
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[0017]
The speaker vibrating member further includes an edge joined to the outer peripheral portion of
the flat diaphragm, and a tinsel wire connected to the input end and the output end of the
plurality of mutually connected rectangular coils and fixed to the outer peripheral plane of the
bobbin. A flat thin speaker is configured using the speaker vibrating member.
That is, a bobbin of a speaker vibration member mounted on a frame, comprising: a plurality of
magnets each having a rectangular plate crowned thereon; and a frame including a plate portion
in which a plurality of magnets are arranged with different polarities adjacent to each other A
plurality of rectangular coils are disposed in the magnetic air gaps defined between adjacent
rectangular plates or between adjacent rectangular plates and the frame.
Therefore, this bobbin arranges the coil in the magnetic gap of the magnetic circuit with the
highest magnetic flux density, and as a result, a flat thin speaker with high efficiency is realized.
[0018]
The method of manufacturing the speaker vibrating member includes the following steps.
That is, the step of fitting and storing a plurality of rectangular coils in the rectangular groove of
the bobbin, the rectangular groove is filled with the ultraviolet curable adhesive, and the
ultraviolet curable adhesive is applied to the outer peripheral flat portion and the rectangular
plane. The step of applying, the step of placing the flat diaphragm on the outer peripheral flat
portion of the bobbin and the rectangular flat surface to bring the flat diaphragm and the bobbin
into close contact, and irradiating the bobbin with ultraviolet light from the back side of the flat
diaphragm. Curing the UV curable adhesive.
In addition, in order to irradiate an ultraviolet-ray to a plane diaphragm and a bobbin, UV
irradiation apparatus etc. are used.
[0019]
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Since a bobbin made of a transparent resin film containing polycarbonate as a main component
transmits ultraviolet light, the UV curable adhesive in the rectangular groove of the bobbin, the
back surface of the flat diaphragm and the outer peripheral flat portion of the bobbin, and the
rectangular flat surface The UV curable adhesive between them hardens to strongly fix the flat
diaphragm and the bobbin.
Since the UV curable adhesive contains no solvent, even if it solidifies in the space closed
between the flat diaphragm and the bobbin, the adhesive containing the solvent is also affected
by the heat generated by the coil. There is no occurrence of malfunction or the like that appears
when using.
Therefore, the speaker using the speaker vibrating member becomes a flat thin speaker with high
input resistance and stability.
[0020]
In the speaker vibrating member, two adjacent rectangular grooves of the bobbin form a
common groove sharing one side thereof, and one side of each of two adjacent rectangular coils
is disposed together in the common groove.
Therefore, in two rectangular coils corresponding to magnets having different polarities next to
each other, one side of each coil can be uniquely arranged in the magnetic gap defined between
adjacent rectangular plates by the common groove of the bobbin.
Further, a plurality of common grooves formed in the bobbin are connected to form a connection
groove crossing the inside of the outer peripheral plane, and an ultraviolet curable adhesive filled
and solidified in the connection groove reinforces the flat diaphragm from the back surface Since
the reinforcing ribs are formed, it is difficult for split vibration of the plane diaphragm to occur,
and flat frequency characteristics can be obtained.
[0021]
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The flat thin speaker provided with the speaker vibrating member according to the present
invention is high in efficiency, hardly generates divided vibration, and can obtain flat frequency
characteristics. In addition, this flat and thin speaker is less likely to malfunction and can provide
stable sound reproduction with high input resistance.
[0022]
In the speaker vibrating member according to the present invention, the bobbin has a flat
vibration, with the object of providing a flat thin speaker which is high in efficiency, hardly
generates divided vibration, obtains flat frequency characteristics, and hardly causes malfunction.
A plurality of outer surfaces fixed to the plate, a plurality of rectangular grooves extending
downward from the outer surface to fit and receive rectangular coils, and a plurality of inner
spaces defined by the rectangular grooves are connected and fixed to the flat diaphragm The
outer peripheral flat surface portion of the bobbin, the rectangular groove, and the rectangular
flat surface are integrally formed by forming a transparent resin film containing polycarbonate as
a main component, filling the rectangular groove of the bobbin, and This is realized by making
the adhesive for fixing the rectangular coil, the bobbin, and the plane vibration plate to be an
ultraviolet curable adhesive.
[0023]
Hereinafter, although the speaker vibration member by the preferable embodiment of this
invention, its manufacturing method, and the speaker using the same are demonstrated, this
invention is not limited to these embodiment.
[0024]
FIG. 1 is a view for explaining a flat thin speaker 1 according to a preferred embodiment of the
present invention.
FIG. 1A is a top view with the flat diaphragm 2 directed upward, and a portion of the flat
diaphragm 2 is transmitted to draw the bobbin 4 and the plate 13 located on the back of the flat
diaphragm 2. .
1 (b) is a side view of the flat thin speaker 1, FIG. 1 (c) is a cross-sectional view taken along the
line AA 'explaining its internal structure, and FIG. 1 (d) is a cross section taken along the line BB'.
FIG. In addition, the one part internal structure etc. which are unnecessary for description are
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abbreviate | omitted.
[0025]
The flat thin speaker 1 of the present embodiment includes a substantially rectangular flat
diaphragm 2 and is a speaker compared to the width W (about 24.4 mm) and the length L (about
62.8 mm) forming the diaphragm area. It is a speaker whose overall height h (about 12.9 mm) is
kept low. Specifically, the flat diaphragm 2 is a molded plate of foamed resin (material: PC
(polycarbonate)), and the outer peripheral portion thereof is supported by the roll edge 3
containing rubber (material: foamed rubber). A bobbin 4 to be described later is fixed to the rear
surface side of the flat diaphragm 2 by an ultraviolet curable adhesive 6, and audio signals are
transmitted to a plurality of coils 5 (12 in the case of this embodiment) attached to the bobbin 4.
When a current is supplied, the bobbin 4 receives a driving force by the magnetic circuit 10
described later, and as a result, when the flat diaphragm 2 vibrates, the flat thin speaker 1
reproduces sound.
[0026]
The magnetic circuit 10 is composed of a frame 11 made of metal of magnetic material, twelve
magnets 12 and a rectangular plate 13 crowned on the top of the magnets 12. The frame 11
includes a flat plate portion 11 a, a rising portion 11 b defining a magnetic gap between the
rectangular plate 13, a frame outer peripheral portion 11 c fixing the edge 3 of the flat
diaphragm 2, and the flat thin speaker 1. And a frame fixing portion 11d fixed to a cabinet or the
like (not shown). Specifically, the frame 11 is formed by pressing an iron plate. The frame 11 is
provided with a plurality of through holes (not shown) through which air on the back side of the
flat diaphragm 2 can enter and exit.
[0027]
As shown in FIG. 1A, on the plate portion 11a of the frame 11, twelve magnets 12 are arranged
such that their magnetic poles are different from each other. Each of the twelve magnets 12 has
the rectangular plate 13 fixed in advance, and is separated into two sets and magnetized so that
the rectangular plate 13 side becomes the N pole or the S pole. Then, the 12 magnets 12
magnetized are aligned and fixed so that the magnetic poles are different from each other by
using a jig on the plate portion 11 a of the frame 11. In the magnetic gaps formed in places
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where the magnetic poles are different from each other, the magnetic flux flies from the N pole to
the S pole, so in each magnetic gap provided in the magnetic circuit 10, the magnetic flux is
directed in the direction according to the arrangement of the magnets 12 Flies.
[0028]
For example, in the case where the rectangular plate 13a in FIG. 1 (a) has N poles, next to it, that
is, in the direction (perpendicular direction) adjacently arranged so that the sides of the
respective rectangular plates face each other. On the side, one in which the magnet 12 is
magnetized is selected and arranged so that the rectangular plates 13b, 13c and 13d show the S
pole. Note that the rectangular plates 13e and 13f located in the 45 ° oblique direction when
viewed from the rectangular plate 13a and whose sides are not opposed are adjacent to the
rectangular plates 13b and 13c or the rectangular plates 13b and 13d, respectively. Therefore,
the magnet 12 and the rectangular plate 13 which are magnetized so as to indicate the N pole
are disposed. Similarly, with respect to other magnets 12 which are not described, the respective
magnetic poles are arranged to be different from each other.
[0029]
Therefore, as shown representatively in FIG. 1D, the magnetic gap between the rectangular plate
13a of the N pole and the rectangular plate 13b of the S pole, that is, between the rectangular
plates 13 of different adjacent magnetic poles is provided. In the magnetic gap 10b, a high
magnetic flux density distribution can be obtained. Further, since the frame 11 also forms a
magnetic path, the magnetic flux density is high also in the respective magnetic gaps 10a formed
between the rising portion 11b and the rectangular plate 13a and between the rising portion 11b
and the rectangular plate 13b. Distribution is obtained.
[0030]
In each magnetic air gap of the magnetic circuit 10, twelve coils 5 are arranged by the bobbin 4.
The bobbin 4 arranges 12 coils 5 so as to wind the magnetic air gaps formed around the 12
rectangular plates 13 in a manner of speaking. At this time, the adjacent coils are connected such
that the audio signal current flowing in each of the coils is in the reverse rotation direction. For
example, when a positive current flows in a clockwise direction as viewed from above the coil 5a
(not shown) disposed in the magnetic gap around the rectangular plate 13a, the magnetic field
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around the adjacent rectangular plates 13b and 13c Coils 5a, 5b, 5c and 5d are connected to
each other so that positive current flows in a counterclockwise direction as viewed from the top,
to coils 5b, 5c and 5d (not shown) respectively disposed in the air gaps. . On the other hand, coils
5a, 5e and 5f are mutually connected to coils 5e and 5f so that a positive current flows clockwise
as seen from the top as in the case of coil 5a. In this case, since the electromagnetic force acts on
all the coils 5a to 5f in the upper surface direction, the driving force acts on the bobbin 4 in
which these coils 5 are disposed in the magnetic gap, and the planar diaphragm 2 is displaced
upward. As described above, the twelve coils 5 are connected to one another such that the
directions of the driving force acting on the bobbin 4 coincide with each other.
[0031]
In addition, when mutually connecting several coil 5, it does not matter whether it is series
connection or parallel connection. The series connection and the parallel connection may be
connected in combination in consideration of the impedances of the respective coils and the
overall combined impedance. Also, in order to make the rotational direction of the voice signal
current flow in such a way that adjacent coils are in the reverse rotational direction, two types of
coils in which the winding directions of the plurality of coils 5 are changed may be prepared.
Even if the winding directions of all the coils 5 are the same, the winding start side and the
winding end side may be interchanged and connected to each other.
[0032]
Further, an audio signal current is supplied to the twelve coils 5 through the terminal 14 and the
tinsel wire 7 connected thereto. Specifically, the frame 11 includes the terminal 14a on the
positive electrode side and the terminal 14b on the negative electrode side, the input end side of
the coil 5 connected to each other is connected to the terminal 14a by the tinsel wire 7a, and the
output of the coil 5 The end side is connected to the terminal 14b by the tinsel wire 7b. The flat
thin speaker 1 of the present embodiment is a case where the plurality of magnets and coils are
twelve and all the magnets and coils are common and square, but the number of magnets and
coils may be two or more. Also, if it is rectangular, it may be rectangular.
[0033]
FIG. 2 is a view for explaining the bobbin 4 constituting the flat thin speaker 1. As shown in FIG.
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2 (a) is a top view, FIG. 2 (b) is a side view and a partial sectional view (C-C 'cross section), and
FIG. 2 (c) is a side view and a portion as viewed from another direction. It is sectional drawing
(DD 'cross section). Specifically, the bobbin 4 of the present embodiment is formed by pressure
forming a transparent resin film having a thickness of 0.125 mm and containing polycarbonate
as a main component. The bobbin 4 includes an outer peripheral flat surface 41, a plurality of
rectangular grooves 42, and a rectangular flat surface 43, and a substantially rectangular groove
is formed in the transparent resin film, that is, the outer peripheral flat surface 41 of the bobbin
4 and the rectangular flat surface 43. From this, the transparent resin film is molded so that the
parallel cross-shaped groove portion connecting the rectangular grooves 42 is made to project.
[0034]
As will be described later, the bobbin 4 forms the speaker vibrating member 9 together with the
flat diaphragm 2. The outer peripheral flat surface 41 and the rectangular flat surface 43 of the
bobbin 4 are flat surfaces fixed to the back surface of the flat diaphragm 2, and form surfaces
defined as the same parallel surface. On the other hand, the rectangular groove 42 is extended
downward from the outer peripheral flat surface 41 and the rectangular flat surface 43 to form a
well-shaped groove. The depth of the rectangular groove 42 of the bobbin 4 is a distance from
the back surface of the flat diaphragm 2 mounted on the frame 11 to the magnetic gap of the
magnetic circuit 10, and the coil 5 accommodated in the rectangular groove 42 is a magnetic gap
It is a length that can be reached and placed. The depth of the rectangular groove 42 is set by the
movable distance in which the flat diaphragm 2 vibrates without contacting the magnetic circuit
and the winding width of the coil 5. The depth of the rectangular groove 42 in the present
embodiment is about 6.1 mm.
[0035]
The rectangular groove 42 fits and accommodates the coil 5, and the width of the groove is
defined by the shape, the inner diameter, and the outer diameter of the coil 5 to be
accommodated. In the case of the present embodiment, the width of the rectangular groove 42a
corresponding to the magnetic gap 10a formed between the rising portion 11b of the frame 11
and the rectangular plate 13 is about 0.4 mm. The width of the rectangular groove 42b
corresponding to the magnetic gap 10b provided between different rectangular plates 13 of
adjacent magnetic poles is about 0.5 mm. The latter rectangular groove 42b is a groove in which
two adjacent rectangular grooves form a common groove sharing one side, so to say, one side of
each of two adjacent rectangular coils is a groove arranged together is there. In addition, the
rectangular flat surface 43 connects the internal space defined by the rectangular groove 42,
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that is, the space that encloses the rectangular plate 13 when the coil 5 is disposed in the
magnetic gap, in the same plane as the outer peripheral flat surface 41. It is a face.
[0036]
FIG. 3 is a view for explaining the speaker vibrating member 9 and is an enlarged view of a
portion corresponding to the E portion of the bobbin 4 described in FIG. 2C explaining a partial
DD ′ cross section of the bobbin 4 FIG. The speaker vibrating member 9 is composed of a flat
diaphragm 2, a bobbin 4, a coil 5 and an ultraviolet curable adhesive 6. Since the rectangular
groove 42a of the bobbin 4 corresponds to the magnetic gap 10a formed between the rising
portion 11b of the frame 11 and the rectangular plate 13a, one side of the rectangle of the coil
5a (for example, the cross section 5aa of one side of the coil 5) It should just have a width that
can accommodate the On the other hand, since the rectangular groove 42b corresponds to the
magnetic gap 10b provided between the rectangular plate 13a and the rectangular plate 13b of
different adjacent magnetic poles, two adjacent rectangular coils (for example, the cross section
5ac of one side of the coil 5a) And, also when one side of the cross section 5ba of one side of the
coil 5b is arranged together, it has a width that can accommodate them. Further, the ultraviolet
curable adhesive 6 fixes the flat diaphragm 2 and the bobbin 4 and fixes the coil 5 and its lead
wire to the rectangular groove 42 of the bobbin 4, and the rectangular grooves 42 a and 42 b of
the bobbin 4. Is filled.
[0037]
Here, a method of manufacturing the speaker vibrating member 9 having the bobbin 4 will be
described. In manufacturing the speaker vibrating member 9, first, the twelve coils 5 are
respectively fitted and accommodated in the rectangular grooves 42 of the bobbin 4. At this time,
the twelve coils 5 may be connected to each other in advance in the preliminary processing step,
and each of the independent coils 5 or a plurality of coils 5 connected in series may be
predetermined. After arranging, fitting and storing in the rectangular groove 42 at the position of
(1), processes such as connecting them in parallel may be provided to connect them. Then, the
lead wire of the coil connecting the coils 5 is pushed into the space in the rectangular groove 42
after the coil 5 is fitted and accommodated. Further, the input end side and the output end side of
the mutually connected coils 5 are drawn to the terminals 14a and 14b respectively, and the
tinsel wires 7a and 7b are soldered and connected to each other.
[0038]
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Next, the rectangular groove 42 of the bobbin 4 is filled with the ultraviolet curable adhesive 6.
At the same time, the ultraviolet curable adhesive 6 is applied also to the outer peripheral flat
portion 41 of the bobbin 4 and the rectangular flat surface 43. Therefore, a predetermined
amount of the ultraviolet curable adhesive 6 may be applied to the upper surface side of the
bobbin 4 by a coating machine, and the ultraviolet curable adhesive 6 may be poured into the
rectangular groove 42 using a spatula or the like. The ultraviolet curable adhesive 6 is in a liquid
state until it is irradiated with ultraviolet light, and is filled so that air does not remain inside the
rectangular groove 42 of the bobbin 4. Also for that purpose, when the UV curable adhesive 6 is
applied to the bobbin 4, immediately after that, the flat diaphragm 2 is mounted on the outer
peripheral flat portion 41 of the bobbin 4 and the rectangular flat surface 43, and the flat
diaphragm 2 and the bobbin Close contact with 4 At this time, it is preferable that the fixing
position of the flat diaphragm 2 and the bobbin 4 be matched and brought into close contact by
using a jig or the like.
[0039]
Further, in order to fix the tinsel wires 7 a and 7 b to the outer peripheral flat surface 41 of the
bobbin 4, the ultraviolet curable adhesive 6 is applied to the input end side and the output end
side of the soldered coil 5. Of course, the tinsel cords 7 a and 7 b may be fixed to the back side of
the flat diaphragm 2 instead of the outer peripheral flat surface 41 of the bobbin 4. Optionally,
other adhesives may be used to secure the tinsel cords 7a and 7b.
[0040]
Next, the bobbin 4 is irradiated with ultraviolet light from the back surface side of the flat
diaphragm 2 to cure the ultraviolet curable adhesive 6. The ultraviolet curable adhesive 6
contains an acrylic resin and a photopolymerization initiator, and when it is irradiated with
ultraviolet light, photopolymerization proceeds to be rapidly cured. The bobbin 4 is made of a
transparent resin film containing polycarbonate as a main component and transmits ultraviolet
light, so the ultraviolet curable adhesive 6 fixes the flat diaphragm 2 and the bobbin 4 in a very
short time, and the bobbin 4 And the coil 5 are fixed. In order to irradiate the flat diaphragm 2
and the bobbin 4 with ultraviolet light, the ultraviolet curable adhesive 6 is efficiently solidified
by irradiating ultraviolet light having a wavelength of about 10 to 400 nm using a UV irradiation
device or the like. Let
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[0041]
Next, the edge 3 is bonded to the outer peripheral portion of the flat diaphragm 2 with an
adhesive. The edge 3 may be a corrugated edge having an undulation in addition to the roll edge
as shown. Gasket 8 is adhered and attached to the outer peripheral side of edge 3 and flat
diaphragm 2 and edge 3 and gasket 8 are attached after being positioned using a jig etc., and
speaker vibration member 9 is completed. Do. The gasket 8 of the speaker vibrating member 9 is
mounted on the frame outer peripheral portion 11c of the frame 11 by setting the dimensional
relationship between the bobbin 4 fixed to the flat diaphragm 2 and the gasket 8 at a
predetermined position, that is, The flat thin speaker 1 can be formed by bonding and fixing the
edge 3 of the flat diaphragm 2 to the frame outer peripheral portion 11c.
[0042]
The UV-curable adhesive 6 does not generate outgassing as found in solvent-based adhesives in
the process of solidification. Therefore, the ultraviolet curable adhesive 6 filled in the rectangular
groove 42 of the bobbin 4, that is, the space closed between the flat diaphragm 2 and the bobbin
4 is irradiated with ultraviolet rays and solidified. Also, the inside of the rectangular groove 42 is
literally filled. Even when the coil 5 fixed is energized and the bobbin 4 generates heat, there is
no factor that causes outgassing inside the rectangular groove 42 of the bobbin 4, so the speaker
vibrating member 9 is stable with high input resistance The flat thin speaker 1 can be realized.
[0043]
In the speaker vibrating member 9, when the UV curable adhesive 6 filling the inside of the
rectangular groove 42 of the bobbin 4 is solidified, the fixed bobbin 4 acts so as to reinforce the
flat diaphragm 2 from the back side. So to speak, a very strong planar diaphragm 2 is formed.
The bobbin 4 has a plurality of rectangular grooves 42, and when they are connected, a common
groove is formed in which one side of two rectangular coils are arranged together, and a plurality
of common grooves are connected to form a connection groove. Do. For example, as shown in
FIG. 2A, the connecting groove X0 extending from one end X1 to X2 in the rectangular groove
42b crosses the inside of the outer peripheral flat surface 41 of the bobbin 4 and is filled in the
connecting groove X0. The solidified UV curable adhesive 6 will form a reinforcing rib X (not
shown) which reinforces the flat diaphragm 2 from the back. Similarly, the connecting groove Y0
from one end Y1 to Y2 in the rectangular groove 42b is also reinforced rib Y crossing the inside
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of the outer peripheral flat surface 41 of the bobbin 4 by the ultraviolet curable adhesive 6 filled
in the connecting groove Y0 and solidified. Form (not shown).
[0044]
The same applies to the other connecting grooves formed by connecting other rectangular
grooves 42 not having a symbol, and the reinforcing rib formed by the UV curable adhesive 6
corresponds to the rectangular groove 42 of the parallel-bar-like bobbin 4 The flat diaphragm 2
is strongly reinforced from the back. Therefore, in the speaker vibrating member 9, it is difficult
for the divided vibration of the flat diaphragm 2 to occur, and flat frequency characteristics can
be obtained.
[0045]
FIG. 4 is a graph showing sound pressure frequency characteristics in the front direction of the
flat diaphragm 2 of the flat thin speaker 1 of this embodiment. The flat thin speaker 1 using the
speaker vibrating member 9 can obtain wide flat sound pressure characteristics over a wide
frequency range of about 100 Hz to 20 kHz by being attached to a small closed box. That is, the
speaker vibrating member 9 is provided with the bobbin 4 provided with the grooved groove in
which the ultraviolet curable adhesive is solidified in the inside thereof, so that the efficiency is
obtained even at the low frequency where the flat diaphragm 2 largely vibrates. Is a high-profile
flat speaker 1. In addition, divided vibration of the flat diaphragm 2 is less likely to occur, and
stable operation with high input resistance becomes possible.
[0046]
In the flat thin speaker 1 of this embodiment, the magnetic circuit 10 using 12 magnets 12 is
exemplified, but of course, the number of magnets may be more, and the arrangement is also 2
rows × 6 It is not limited to the column.
[0047]
In addition, the speaker vibrating member 9 of the present embodiment and the method of
manufacturing the same may further include other steps to improve the characteristics, as long
as each step of the above manufacturing method is included. It is not limited to the above
description.
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[0048]
The speaker vibrating member of the present invention and the method of manufacturing the
same are applicable not only to the speaker provided with the flat diaphragm but also to the
diaphragm of the headphone.
[0049]
It is a figure explaining the flat thin speaker by preferable embodiment of this invention.
It is a figure explaining the bobbin of the speaker vibration member by preferable embodiment of
this invention.
It is an enlarged view explaining the speaker vibration member by a preferred embodiment of the
present invention.
It is a graph showing the sound pressure frequency characteristic of the flat thin speaker of a
present Example.
Explanation of sign
[0050]
Reference Signs List 1 flat thin speaker 2 flat diaphragm 3 edge 4 bobbin 5 coil 6 UV curable
adhesive 7 tinsel wire 8 gasket 10 magnetic circuit 11 frame 12 magnet 13 rectangular plate 14
terminal
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