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JPH09322288

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DESCRIPTION JPH09322288
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker and a speaker using the diaphragm, and more particularly, a core
diaphragm having a core material sandwiched by skin materials, and the core diaphragm using
repulsion The present invention relates to a speaker using a magnetic circuit.
[0002]
2. Description of the Related Art A core formed by sandwiching a core material provided with a
large number of continuous cavity portions with a skin material, such as a honeycomb, since the
rigidity and lightness required for the diaphragm can be conventionally maintained. Core
diaphragms formed of sandwich plates may be used. Although this core diaphragm may be
formed in a cone shape, in most cases, it is used as a flat diaphragm in a flat panel speaker.
[0003]
On the other hand, there is a repulsion type magnetic circuit in which magnets are disposed so
that the same poles face each other and a center plate made of a magnetic material is interposed
between both magnets as suitable for reducing the thickness and weight of the magnetic circuit
portion. There is a speaker that uses this repulsion type magnetic circuit and arranges a voice
coil in a repulsion magnetic field generated on the outer periphery of the center plate.
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[0004]
When the flat type speaker is constituted by the core diaphragm using the repulsion type
magnetic circuit, a flat core diaphragm is joined to the outer peripheral portion of the voice coil,
and the flat type as described above There are also cases where a plurality of the repulsion type
magnetic circuit and the voice coil are arranged on the diaphragm of to make a multipoint drive
type speaker.
[0005]
11 to 16 show an example of a speaker using a conventional flat core diaphragm and a repulsion
type magnetic circuit, and the core diaphragm 1 generally has a honeycomb core 1C as a skin 1S.
A honeycomb flat plate of a predetermined thickness (about 4 mm to 6 mm) sandwiched by two
or more plates is used, and this honeycomb flat plate is punched into a diaphragm shape of a
predetermined size by a press, and a suspension is obtained on the outer peripheral portion of
the diaphragm obtained. Wear the edge 2 as.
[0006]
As shown in FIG. 11, in the outer peripheral portion of the core diaphragm 1 cut out from the
honeycomb plate as described above, a part (peripheral cutting portion) of the core material 1C
is exposed.
The honeycomb plate is made of an extremely thin material such as aluminum foil, resin film,
thin paper, etc., from the viewpoint of functional and characteristic requirements, and when the
core diaphragm 1 vibrates, the core material 1C is The exposed portion of the ring resonates to
generate an abnormal sound, which is generally called "squeal".
Alternatively, the bonding portion between the core material 1C and the skin material 1S peels
slightly in the trimming operation at the time of cutting out, and the peeling portion and the core
material 1C come in contact to generate an abnormal sound called as so-called "bill" There is a
phenomenon of
[0007]
In order to cope with the generation of abnormal noises such as "squeal" and "biri", at present the
adhesive B3 is applied to the exposed part of the core material 1C as shown in FIG. An abnormal
sound is suppressed by suppressing the resonance of the exposed part of the core material 1C by
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the treatment, and further reattaching the peeled part between the skin material 1S and the core
material 1C to eliminate contact between the core material 1C and the skin material 1S. 12 or
using the urethane edge 2 as shown in FIG. 12, the pasting margin 23 of the edge 2 is molded as
shown in FIG. 12, and the pasting margin 23 is made to cover the exposed portion. Of the core
material 1C and the contact noise between the peeled part of the core material 1C and the skin
material 1S by the effect that the bonding margin part presses down the exposed part of the core
material 1C using the elasticity of urethane. To prevent the occurrence of
[0008]
However, the above countermeasure has the following drawbacks.
First, in the method of applying the adhesive to the exposed portion of the core material 1C at
the outer peripheral portion of the diaphragm, the application amount of the adhesive B3 for
suppressing the resonance of the core material 1C is an average standard in the production of
ordinary speakers, for example, edge If the application amount is two to three times as large as
the application amount of the adhesive B1 for attaching the second grade, the effect is small.
[0009]
In addition, since the core material 1C has directionality, the adhesive does not uniformly adhere
to the application surface depending on the direction at the time of adhesive application, and
flows from the predetermined application surface and drips on the skin material 1S side It will be
in the state.
Therefore, after it is necessary to apply a small amount of adhesive B3 and to dry and cure it, it is
necessary to repeat the application and drying several times, so that the number of steps of
applying adhesive B3 is increased. It has the disadvantage of increasing the weight of the
diaphragm by the amount of adhesive B3 applied.
[0010]
Further, as shown in FIG. 12, in the method of covering the exposed portion of the core material
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1C in the outer peripheral portion of the diaphragm with the bonding margin 23 of the edge 2
made of urethane, the material of the edge 2 is the portion covering the exposed portion of the
core material 1C. Not only has the disadvantage that the diaphragm weight is heavy, but it also
has the disadvantage that abnormal noises such as "squeal" and "billing" are regenerated due to
aging. That is, since the urethane edge 2 is deteriorated by the irradiation of ultraviolet rays and
the like, the elasticity of the urethane is deteriorated due to the secular change, and the elasticity
is finally lost, and the effect of suppressing the exposed portion of the core material 1C is
weakened. is there.
[0011]
Furthermore, as is well known, the honeycomb core is configured in a shape in which hexagons
of a predetermined size are adjacent and connected. Therefore, when a diaphragm, in particular,
a flat diaphragm is used as a premise, since the inside of the diaphragm is a structure having a
fixed pattern, when it is used as a diaphragm, it is likely to cause resonance at a specific
frequency, and frequency characteristics The peak has a drawback that is prone to dip.
[0012]
As the most common measure to prevent the occurrence of this resonance, a method of
suppressing the resonance by sticking a dumping agent etc. in the vicinity of the resonance
occurrence point of the diaphragm and consequently preventing the occurrence of peak and dip
in the frequency characteristic Although this method is adopted, there is a drawback that the
diaphragm weight is increased and the efficiency is lowered by the addition of weights such as a
dumping agent and an adhesive to be attached.
[0013]
On the other hand, we first use a repulsion type magnetic circuit in which two magnets are
disposed so that the same poles face each other and a center plate made of a magnetic material is
sandwiched between the two magnets. A voice coil is disposed in a repulsive magnetic field
generated in the thin-film speaker in which a substantially flat diaphragm is joined to an outer
peripheral portion of the voice coil, and a plurality of the repellent magnetic circuit and the voice
coil We propose a typed speaker and put it into practice.
The diaphragms of the thin speaker and the thin multi-point drive speaker are made of pulp, and
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balsa wood, pulp chips and the like are used as core materials.
[0014]
FIG. 13 shows an example thereof, and as shown in the cutaway portion of FIG. 13A, the
honeycomb flat plate diaphragm 1 in which the core material 1C is a honeycomb is used, and the
repulsion type magnetic circuit and the voice coil 3 are It is the structure arrange | positioned
three places on a straight line. The honeycomb diaphragm 1 has a length of 196 mm, a width of
64 mm, and a thickness of 4 mm, as shown in the figure, and long sides are connected by a
circular arc having a radius of 32 mm. As shown in the figure, a total of 3 28.7 mm diameter
holes are provided at a position of 62.4 mm by centering and a voice with an inner diameter of
25.9 mm, an outer diameter of about 28.6 mm, and a winding width of 6.8 mm. The coil 3 is
adhesively arranged.
[0015]
Furthermore, as shown in FIGS. 13A and 13C, on the front and back sides of the outer peripheral
portion of the diaphragm 1, a roll edge having a radius of section of about 4 mm as shown in the
cross sectional view of FIG. As shown in FIG. 13 (B), two flat-lined braided yarn lines L knitted in
a flat-knit shape are mounted in parallel on the surface of the edge 2 placed on the back side.
The line L is disposed in a state of crossing the back surface side of the honeycomb flat plate
diaphragm 1 and sandwiching the outside of the voice coil 3 in parallel, and the voice coil 3 is
connected and connected with the flat braided tinsel wire L. Further, the flat knitting tinsel wire L
extends to the outer peripheral portion of the edge 2 and a frame ring FL made of resin is
attached to the outer bonding margin portion of the edge 2.
[0016]
Accordingly, since the flat knitting tinsel wire L also extends to the frame ring FL, the input
terminal lugs T1 and T2 are attached at a predetermined position near the end of the flat knitting
tinsel wire L as shown in the back view of FIG. As a result, the terminal lugs T1 and T2 and the
end of the flat braided tinsel wire L are in contact with each other and connected. Further, the
support P is attached to the frame ring FL and the front frame FF and the rear frame FR are
attached via the support, and the front frame FF and the rear frame FR are attached as shown in
the sectional view of FIG. The repulsion type magnetic circuit is attached to a predetermined
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position corresponding to the voice coil 3. In the figure, P is a support.
[0017]
The diaphragm 1 of the speaker has a predetermined (4 mm) thickness, and the flat neck portion
is different from the neck portion DN of the general cone-shaped diaphragm DF shown in FIG. 16
and is shown in FIG. Thus, the adhesive BN does not accumulate in the outer peripheral portion
of the voice coil 3. Therefore, when the adhesive BN is applied to the outer peripheral portion of
the voice coil 3, the adhesive BN is applied to the gap between the voice coil 3 generally used
generally and the neck portion 1N provided in the honeycomb flat plate diaphragm 1. It is
difficult to flow into the gap between the outer periphery of the voice coil 3 and the inner
periphery of the neck 1N, and the skin 1S and the outer periphery of the voice coil 3 are bonded,
but the core 1C and the outer periphery of the voice coil 3 exposed to the inner periphery of the
neck In the adhesion with the part, variation occurs, and as shown in FIG. 14, there is a
possibility that the non-adhered part X is generated, and the part X may cause the generation of
abnormal noise such as “squeal” or “bill”. There was found.
[0018]
The voice coil 3 and the diaphragm 1 can be bonded by widening the gap size of the neck portion
1N as the easiest measure against the above-mentioned drawbacks. That is, it is easy to flow in
the adhesive BN by widening the gap size, or it is easy to pour the adhesive BN directly into the
spread and fill it. However, this method has the disadvantage that the weight increases due to the
large amount of adhesive application, and the characteristics of the adhesive BN that can
withstand the large amount of application, for example, it flows out to the back side of the
diaphragm 1 against the application weight. There is a disadvantage that it is necessary to select
an adhesive BN having a certain degree of viscosity, and such selection items have the
disadvantage that the degree of freedom in design is limited and the range of use of the speaker
is also narrowed.
[0019]
Furthermore, in the thin speaker having the above structure, when the edge 2 is attached to the
core diaphragm 1 having a predetermined thickness, the edge 2 is only one side of the
diaphragm, for example, the front surface side or the back surface side of the core diaphragm 1
The voice coil 3 has only one support point in the axial direction because it does not have a
suspension, which is called a damper or a spider, etc., provided in conventional general speakers.
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Rolling is apt to occur, and as the thickness dimension of the core diaphragm 1 increases, the
occurrence of rolling increases.
[0020]
Therefore, in order to cope with such a defect, as shown in FIGS. 13 and 14, the edge 2 is
adhered to the front surface side and the back surface side of the core diaphragm 1.
However, when the edge 2 is mounted on both sides of the core diaphragm 1, the part held
between the two edges becomes a closed space, so the front side or the back side is either
reinforced or adhesively attached to the edge 2 mounted later It becomes extremely difficult to
apply the adhesive B2 referred to as
[0021]
In order to bond the edge 2 and the diaphragm DF to a general cone-shaped diaphragm DF as
shown in FIG. 16, the reinforcement bonding will be described with a predetermined amount of a
predetermined width not on the edge side but on the outer periphery of the diaphragm DF. The
adhesive B1 (mainly rubber-based) is applied and the solvent of the adhesive is evaporated, and
then the bonding margin 21 of the edge 2 is superposed on the adhesive-coated portion, and the
superposed portion is hot-pressed. Thus, the adhesive B1 is thermally reactivated, and the
bonding margin portion of the edge 2 is attached and attached to the outer peripheral portion of
the diaphragm DF.
[0022]
Further, at the time of bonding of the edge 2, the adhesive B1 coated on the side of the
diaphragm DF is coated wider than the width of the bonding margin 21 on the inner peripheral
side of the edge bonding margin 21 as shown in FIG. As shown in the partial enlarged view, the
adhesive B1 bites into the innermost periphery of the bonding margin 21 and no unbonded part
is generated, but it is impossible to apply extra adhesive on the outermost periphery of the
diaphragm DF As shown in FIG. 16, a fine non-adhered portion X is generated between the edge
affixing portion 21 (corrugation inner peripheral side), and the unadhered portion X generates
an abnormal sound such as “bill”. generate.
[0023]
As a countermeasure, as shown in the local enlarged view of FIG. 16 (B), after the edge 2 is
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attached, the adhesive B2 such as rubber-based diluted with a solvent is applied to the outermost
periphery of the diaphragm DF The adhesive margin of the edge 2 and the non-adhered part X
are adhered by filling the part with the adhesive B2, and this is called so-called reinforcement
adhesion.
[0024]
However, as described above, when the edge 2 is provided on the front surface side and the back
surface side of the core diaphragm 1, reinforcement bonding of one edge 2 is possible but
reinforcement bonding of the other is impossible.
[0025]
In addition, after the diaphragm 1 and the front side edge 2 are adhered and reinforced, when
the rear side edge 2 is adhered without adhering the frame ring FL, a gap is generated because
the frame ring FL is attached.
Therefore, the adhesive application nozzle can be inserted from this gap, and the adhesive B2 can
be applied to perform reinforcement bonding, but the workability of the adhesive application is
poor and attachment to the frame ring of the outer edge is extremely difficult It has the
disadvantage that it inevitably requires a large number of man-hours.
[0026]
Therefore, the present invention solves the above-mentioned drawbacks of the speaker
diaphragm by the conventional core diaphragm and, at the same time, such a flat diaphragm and
a repulsion type magnetic circuit It is an object of the present invention to eliminate the
disadvantages of thin speakers or thin multi-point drive speakers using
[0027]
[Means for Solving the Problems] In order to achieve the above object, the speaker diaphragm of
the present invention is provided with a large number of continuous cavities as in the case of a
honeycomb or the like. In a speaker diaphragm with a core diaphragm formed of a core sandwich
plate in which the core material is sandwiched between skin materials, at least the core material
is integrally molded so that a large number of cavity portions are connected by a resin film or
metal foil. These are covered with a skin material to make a sandwich plate.
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[0028]
According to the second aspect of the present invention, a plurality of core members molded so
that a large number of cavities are connected by laminating are laminated and bonded to
constitute one core member.
[0029]
In this case, the material of the plurality of core members to be adhered is made different in the
third aspect, and the resin film is formed between the adhesion portions of the core members in
the fourth aspect. Alternatively, it is characterized in that the metal foil is sandwiched and
adhered.
[0030]
A fifth aspect of the present invention is characterized in that a part of the core material or a part
of the bonded portion of the bonded core member is cut away so that the cavities communicate
with each other.
[0031]
A sixth aspect of the present invention is characterized in that the core member or the core
member is integrally molded with an attaching margin portion of an edge for supporting the core
diaphragm or a neck portion for coupling with a voice coil.
[0032]
A seventh aspect of the present invention is characterized in that the skin material is integrally
molded with a sticking margin portion of an edge for supporting the core diaphragm or a neck
portion for coupling with a voice coil.
[0033]
According to the eighth aspect of the present invention, at least one of the core material and the
skin material is molded with a substantially para-oriented aromatic polyamide film having a
tensile modulus of 600 Kg / mm 2 or more. .
[0034]
According to a ninth aspect of the present invention, the aromatic polyamide film is a
polyparaphenylene terephthalamide (hereinafter referred to as "PPTA") film and contains at least
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50% or more, preferably 80% or more of water as a swelling agent. It is characterized in that it is
a PPTA gel-like film.
[0035]
The loudspeaker according to the present invention is characterized in that the magnetic circuit
is a repulsion magnetic circuit and the diaphragm for a loudspeaker according to any one of
claims 1 to 8 is used as a diaphragm.
[0036]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of a speaker diaphragm
and a speaker according to the present invention and a method of manufacturing the same will
be described based on FIGS. 1 to 10, but the same reference numerals are used for the same
components as the conventional one. And the detailed description is omitted.
[0037]
In the figure, reference numeral 1 denotes a core diaphragm, and 1C denotes a core member,
which is a resin film or a metal foil of titanium or the like, and is molded into a shape in which a
large number of cavities are connected.
In the embodiment shown in FIGS. 1 to 3, the resin film or metal foil of titanium or the like
having a thickness of about 25 μm to 50 μm is molded by heat pressure molding or the like by
using a means such as heat pressure molding. A plurality of core members 1Ca are bonded to
each other.
FIG. 3 shows an example in which the tops of the convex portions on the surface side of the
molded product face each other and are bonded.
[0038]
FIG. 4 shows an example in which not a bonding of core members but an uneven portion in
which the height of the convex portion and the depth of the concave portion are deepened is
formed on one core material 1C and the skin material 1S is bonded thereto. ing.
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In addition, in bonding the core members, although not shown, the tops of the convex portions of
the core members 1Ca may be crossed to make the tops of the convex portions face the bottoms
of the concaves, or the back side of the core members 1Ca That is, the bottoms of the concave
portions may be bonded face to face.
In short, the configuration may be such that a large number of cavities are connected in series.
[0039]
In addition, when the thickness is required, it is possible to obtain a desired thickness by
laminating and bonding the required number of core members 1Ca.
The skin material 1S is attached to the core material 1C formed in this manner to form the core
diaphragm 1.
[0040]
Next, a specific example of the core material 1C will be described. The molding material is a resin
film having excellent characteristics as an acoustic material, particularly a substantially paraoriented aromatic polyamide film having a tensile modulus of 600 kg / mm 2 or more. It is used
and the representative poly para phenylene terephthalamide (henceforth "PPTA").
) Film is used.
Moreover, in the embodiment, a PPTA gel-like film having a thickness of about 140 μm is used
in a state of containing at least 50% or more, preferably 80% or more of water as a swelling
agent, and this film is heat-pressed and formed. The core member 1Ca and the core material 1C
having the following shape were obtained.
[0041]
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11
A method of molding an acoustic material using this film has already been proposed as Japanese
Patent Application Nos. 1-171989, 5-107368 and 5-255295, and this molding method is also
suitable for mass production. It is a proven method.
[0042]
The molded shape of the core material 1C will be described with reference to the plan view of
FIG. 1. The external dimensions are the same as those of the conventional example, and the
length is 196 mm, width 64 mm, thickness 4 mm and radius 32 mm at the end of the long side.
An arc is provided to connect two long sides, and the planar shape is an elongated hole shape
(generally called a track shape).
Further, as in the conventional example, as shown in the figure, a concave flat portion with a
diameter of 29.5 mm for arranging the voice coil at the center of the plane of core material 1C
and 62.4 mm in center distribution in the longitudinal direction from the center Further, as
shown in the drawing, a predetermined number of substantially conical concave portions, which
are a cavity portion from the center of the concave flat portion, are molded into a predetermined
radial position.
[0043]
The shape of the core member 1C will be described with reference to the enlarged cross sectional
view of FIG. 3. The concave portion formed in the core member 1Ca is appropriately disposed
each having a diameter of 3 mm and 2 mm at the bottom of the recess. A tapered portion Ct of
15 degrees from the outer peripheral portion is provided.
The same 15 ° tapered portion Nt (see FIG. 8) is also provided on the concave flat portion with a
diameter of 29.5 mm for arranging the voice coil 3 and the outer circumferential portion of the
core material 1C is 60 And a flat portion of about 4 mm in width extending outward from the
outer peripheral portion of the tapered portion 1Ct, and the back surface side of the core
member 1Ca (the lower side shown in FIG. 3) An adhesive was applied to the resultant, and the
coated surfaces were adhered to each other with a heat press in a state where the coated
surfaces were opposed to obtain a core material 1C.
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[0044]
The skin material 1S is a PPTA film with a thickness of 25 μm, using a product name called
Alamica # 1200 (manufactured by Asahi Kasei Co., Ltd.), and the film has a flat track shape as
shown in FIGS. 2 and 3. As shown, it is obtained by heat-pressure molding in such a shape that
the tapered portion 1ST of the outer peripheral portion is combined with the tapered portion 1Ct
of the core material 1C, that is, a shape that covers the core material 1C. Is applied, and the hole
1SN (diameter 30.6 mm) (see FIG. 8) of the coil attachment portion is removed and cut with a
press and bonded to the surface and back side of the core material 1C by a heat press. The core
diaphragm 1 was obtained.
[0045]
Furthermore, when a concave portion for voice coil attachment provided in the core member 1C
is cut out with a press with a predetermined diameter (27.5 mm), a neck portion 1CN is formed,
and an extra portion of the outermost periphery is cut out with a press By removing, the bonding
margin portion 1E of the edge 2 in the diaphragm is configured.
An adhesive is applied to the edge affixing portion 1E, and the edge 2 made of a cloth having a
cross-sectional shape as shown in FIGS. 1 and 2 is attached by a heat press to obtain a flat
diaphragm for multi-point driving. When a thin multi-point drive speaker was completed using
the flat diaphragm and the repulsion magnetic circuit, performance equal to or better than that
of the conventional speaker was obtained.
[0046]
With the above configuration, as shown in FIG. 8, the core diaphragm 1 can be provided with the
tapered portion Nt at the neck portion 1CN of the core diaphragm 1, and as shown in FIGS. In the
case where the voice coil 3 is disposed on the outer periphery of the center plate SP of the circuit
with a fixed clearance, and the flat core diaphragm 1 of the above configuration is joined to the
outer periphery of the voice coil 3 to produce a thin speaker Even when the adhesive BN for
bonding the voice coil 3 and the neck portion 1CN is applied as shown in FIG. 9, the tapered
portion Nt constitutes an adhesive reservoir portion.
[0047]
Accordingly, the structure is substantially the same as the neck portion DN of the conventional
cone diaphragm DF shown in FIG. 16, the adhesive naturally contacts the outer peripheral
portion of the voice coil 3 and the taper portion Nt, and the thickness dimension of the neck
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portion 1CN Is extremely thin (about 0.6 mm or less), the adhesive easily flows into the outer
periphery of the voice coil 3 and the neck portion 1CN, so the adhesion between the neck portion
1CN and the voice coil 3 becomes ideal, as shown in FIG. There is no variation in adhesion
between the outer peripheral portion of the voice coil 3 and the diaphragm as in the prior art
shown in FIG.
[0048]
Furthermore, since the core diaphragm 1 can form the outer peripheral portion of the core
member 1Ca, the core material 1C, or the skin material 1S into an arbitrary shape, the core
attachment plate 1E is subjected to the core vibration as shown in the illustration. It is possible to
arrange on the center line of the section of board 1.
That is, as shown in FIG. 10, when the edge 2 is disposed on the center line of the cross section
of the core diaphragm 1, the center line of the voice coil 3 in the winding width direction is also
aligned with the center line of the diaphragm 1. Therefore, the edge affixing portion 21 is
disposed near the center line of the edge 2 through the neck portion 1CN of the core diaphragm
1 and the affixing portion 1E provided on the outer periphery of the outer periphery of the voice
coil 3. , 22 can be supported.
[0049]
In the local enlarged view of FIG. 10 (B), the thickness of the core material 1C and the skin
material 1S is emphasized in order to be easily understood, so the positions of the edge affixing
parts 21 and 22 are the diaphragm center line The actual thickness of the skin material 1S and
core member 1Ca is 25 μm to 50 μm, and the thickness is 0.6 mm or less including the
thickness of the adhesive layer, although it is drawn substantially more off in practice. It has
settled in the range without a problem.
[0050]
Therefore, even with one edge, the center of the drive unit (voice coil 3) is supported at the
center of the support mechanism (edge 2), so that a vibration system structure in which the
occurrence of rolling is extremely small can be realized. It is possible to produce a vibration
system that can withstand practical use without using (two) edges, and since only one edge is
required, the number of edge attachment steps is that of the conventional cone diaphragm edge
bonding It has the advantage that it can be carried out with the same number of steps and that
reinforcement bonding can be achieved easily and reliably.
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[0051]
In the above example, the core (the cavity) has a conical shape, but any other shape may be used
as long as the core is formed, and the arrangement and combination of the cores may be used.
Can be selected appropriately according to the purpose.
Furthermore, in the above example, in molding of the core member 1Ca and the core material 1C,
dry molding and heat treatment molding are performed using a gel-like PPTA film in a state
containing water as a swelling agent having a very high elongation of 80% or more. According to
the purpose of the diaphragm, it can be carried out using metal (eg, titanium foil, aluminum foil,
etc.) or other resin (eg, polyimide resin film, etc.) as the material of the core material 1C. .
[0052]
Further, although not performed in the embodiment, when weight reduction of the core material
is emphasized, as shown in FIG. 5, it is possible to provide weight reduction by providing a
deletion portion Cc in a part of the core material 1C. If strength is more important than weight,
as shown in FIG. 6, metal foil 4 (eg, titanium foil, aluminum foil etc.) or resin film 4 (eg polyimide
resin film etc.) is interposed between core members 1Ca. It is possible to secure the strength of
the core material 1C by sandwiching and bonding.
Although not shown, the core member 1Ca may be laminated and attached if the thickness of the
core material is not the desired thickness.
[0053]
In the above example, since the core is provided to the outer peripheral tapered portion 1CT of
the core material 1C, the concavo-convex shape of the core extends to the outer peripheral
tapered portion 1CT.
Therefore, when the skin material 1S is planar, the unevenness of the core in the tapered portion
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1CT is exposed, and the outer peripheral portion of the skin material 1S is also covered for the
purpose of covering the tapered portion and improving the strength of the outer peripheral
portion. The tapered portion 1ST was formed in accordance with the core material 1C, but
depending on the purpose, for example, the unevenness of the core extending to the tapered
portion 1CT may be exposed, or the strength of the outer peripheral portion is sufficient. In the
case, as shown in FIG. 7, in the case of a structure in which the outer peripheral tapered portion
1CT is not provided with a core, it is also possible to use an unformed flat skin material 1S.
[0054]
In the embodiment, although the embodiment is applied to a flat core diaphragm, it is of course
possible to apply to a general cone-shaped diaphragm.
[0055]
According to the speaker diaphragm of the present invention, when manufacturing the core
diaphragm, an adhesive referred to as core coating on the peripheral portion of the diaphragm,
like a diaphragm using a conventional honeycomb core flat plate. Since the core material is a
molded product, the shape of the cavity (core) can be arbitrarily set, and the arrangement and
combination of cavities can be appropriately selected according to the purpose.
[0056]
Therefore, as in the prior art, the core has a certain pattern as a honeycomb, that is, a defect that
easily causes resonance at a specific frequency when used as a diaphragm, or a defect that
causes peaks and dips in frequency characteristics. It can be avoided and the occurrence of peaks
and dips can be reduced.
[0057]
In the second aspect of the present invention, the selectivity of the material in the core material
is increased, and, for example, when the desired material is a material which is difficult to mold
the core, the molding depth such as the concavo-convex portion forming the cavity portion. This
can be solved by obtaining a shallow core member and bonding the core members together.
[0058]
According to the third aspect of the invention, since the resonance points of the plurality of core
members bonded to each other are different, the resonance of the diaphragm can be reduced,
resonance at a specific frequency is avoided, and the peak in the frequency characteristic It is
possible to reduce the occurrence of dips.
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[0059]
According to the fourth aspect of the present invention, the strength of the core diaphragm can
be increased, and the resonance point with the core material can be changed by examining the
material such as the resin film or metal foil to be inserted.
[0060]
According to the fifth aspect of the present invention, the core diaphragm can be reduced in
weight, and the resonance point of the core material can be changed by devising the selection of
the cut portion of the bonded portion or the non-bonded portion and the cut shape. It becomes
possible.
[0061]
According to the sixth and seventh aspects of the invention, since the rib effect is applied to the
outer peripheral portion or the neck portion of the core diaphragm, the vicinity of the driving
portion (neck portion) or the diaphragm outer peripheral portion (edge bonding) of the core
diaphragm is provided. The strength of the vicinity can be easily improved.
[0062]
The balance of the heat resistance, propagation speed, internal loss, etc. is extremely good, and
the core diaphragm has higher performance, and the material is a yellowish brown transparent
film. The adhesion state of the core material and the skin material can be easily visually checked.
[0063]
According to the ninth aspect of the present invention, since the gel PPTA film has a very high
elongation rate and is rich in moldability, it is possible to obtain a finer and deeper core shape
than other resin films, and design The degree of freedom is greatly improved.
[0064]
According to the speaker of the present invention, it is possible to further reduce the thickness of
the thin speaker or the thin multi-point drive type speaker, and it is possible to provide a speaker
with less peaks and dips in frequency characteristics as well as easy bonding operation at the
time of assembly. can do.
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[0065]
Brief description of the drawings
[0066]
1 shows an embodiment of the speaker diaphragm of the present invention, (A) is a plan view of
the core diaphragm, (B) is a cross-sectional view.
[0067]
2 is a cross-sectional view showing components of the core diaphragm.
[0068]
Fig. 3 A partial enlarged view of the core material and the skin material of the core diaphragm.
[0069]
4 is a local enlarged view showing another form of the core material.
[0070]
5 is a partially enlarged view of a form in which a part of the core material of the core diaphragm
is cut away.
[0071]
6 is an enlarged cross-sectional view showing an example in which a metal foil or a resin film is
sandwiched between core members.
[0072]
7 is an enlarged sectional view showing another configuration example of the core material and
the skin material.
[0073]
8 is a local enlarged view of the vicinity of the neck portion of the core diaphragm, (A) is a plan
view, (B) is a cross-sectional view.
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18
[0074]
9 shows an embodiment of the speaker of the present invention, (A) is a cross-sectional view of
the speaker, (B) is a partial enlarged cross-sectional view showing the bonding state of the voice
coil and the neck portion.
[0075]
10 shows the bonding state in the vicinity of the edge in the speaker of the present invention, (A)
is a cross-sectional view of the speaker, (B) is a local enlarged cross-sectional view in the vicinity
of the edge.
[0076]
11 is a local enlarged sectional view showing an example of edge processing of the outer
peripheral portion of the core diaphragm using the conventional honeycomb core flat plate.
[0077]
12 is a partial enlarged cross-sectional view showing an example of the edge processing of the
outer peripheral portion of the core diaphragm in a part of the edge member in the conventional
core diaphragm.
[0078]
13 shows a multi-point drive type loudspeaker using a honeycomb core diaphragm and a
repulsion type magnetic circuit which has already been proposed, (A) is a front view, (B) is a
sectional view, and (C) is a rear view.
[0079]
14 is a cross-sectional view of the voice coil and the neck portion of the multi-point drive type
speaker in FIG. 13, (A) is a cross-sectional view of the speaker, (B) is a local enlarged crosssectional view showing the bonded state of the voice coil and the neck portion.
[0080]
15 is a cross-sectional view of the vicinity of the edge of the multi-point drive type speaker in
FIG. 13, (A) is a cross-sectional view of the speaker, (B) is a local enlarged cross-sectional view
showing the bonding state near the edge.
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[0081]
16 is a sectional view showing the vicinity of the cone diaphragm and the neck portion in the
conventional cone-shaped speaker, (A) is a cross-sectional view, (B) is a partially enlarged crosssectional view showing a bonding state in the vicinity of the edge.
[0082]
Explanation of sign
[0083]
Reference Signs List 1 core diaphragm 1C core material 1Ca core member 1CN core material
neck portion 1CT core material outer peripheral tapered portion 1E core material (skin material)
edge bonding margin portion 1N diaphragm neck portion 1S skin material 1SN skin material
neck portion 1ST skin material outer periphery taper Part 2 Edge 21 Edge sticking margin
(diaphragm side) 22 Edge sticking margin (frame side) 23 Edge sticking margin (core pressing
part) 3 Voice coil 4 Metal foil etc. B1 Adhesive (edge) B2 Adhesive (edge) Reinforcing adhesion)
B3 Adhesive (core coating) BN Adhesive (neck) Cc Core Cut-out part Ct Core taper part DF coneshaped diaphragm DN cone-shaped diaphragm neck part F frame ring FF front frame FR rear
frame L P Support M1 Magnet M2 Magnet SP Center plate T1 Input terminal lug T2 Input
terminal lug X Not bonded Department
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