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JP2014514828

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2014514828
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a method for forming a suspension element for
an acoustic driver. The method comprises the steps of placing in a mold an unimpregnated fabric
formed of monofilament polymer fibers characterized by a softening point and a melting point,
said mold and said unimpregnated fabric being above said softening point and above said
melting point. Heating to a low temperature and cooling the mold.
Acoustic suspension elements of monofilament textiles
[0001]
The present specification relates to a suspension for the moving part of an electroacoustic
transducer.
[0002]
U.S. Pat. No. 5,878,150
[0003]
In one aspect herein, a method for forming a suspension element for an acoustic driver includes
placing an unimpregnated fabric formed of monofilament polymer fibers in a mold.
Monofilament fibers are characterized by their softening point and melting point.
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The method further includes heating the mold and the non-impregnated fabric to a temperature
above the softening point and below the melting point, and cooling the mold. The method may
further comprise the step of coating the suspension element with an elastomer in such a way as
to join but not fuse the fiber intersections. The step of coating may include the step of coating the
suspension element so that the plurality of openings in the fabric can be sealed. The step of
coating may include the step of coating the suspension element such that air flows through the
plurality of openings in the fabric. The coating step may be performed prior to the step of placing
the non-impregnated fabric in the mold. The method may further comprise the step of removing
the fabric from the mold. The coating step may be performed after the step of removing the
fabric from the mold. The method may further include the step of forming a convolution on the
suspension element. The method comprises: a semi-cylindrical portion in the surround having a
series of grooves extending from the inner periphery to the outer periphery at an angle relative
to the normal to the inner edge of the surround at the location of the groove closest to the inner
periphery The method may further include the step of forming The fabric may be formed of
monofilament polymer fiber bundles.
[0004]
In another aspect herein, the suspension element for an acoustic driver comprises a fabric
formed of monofilament polymer fibers, wherein the plurality of fibers are woven such that they
are not fused at the intersection of the plurality of fibers. The fabric may be non-impregnated.
The suspension can be provided with radial turns. The suspension element may comprise a semicylindrical geometry having a plurality of grooves at an angle to the normal of the inner edge of
the suspension element at the position of the groove closest to the inner circumferential edge. ポ
リマーは、ポリエステルにすることができる。 ポリマーは、PEEKにすることができる。 ポリ
マーは、PPSにすることができる。 The suspension element may further comprise a coating
consisting of a soft polymer. The suspension may be sealed so that air does not flow through the
fabric. The suspension elements may not be sealed so that air can flow through the fabric. The
soft polymer can be a synthetic rubber. The soft polymer can have a modulus of elasticity of 100
megapascals or less. The soft polymer can have a modulus of elasticity of 1 megapascal or less.
The fabric may be formed of monofilament fiber bundles. The suspension elements can be
surround. The suspension element can be a spider.
[0005]
Other features, objects, and advantages will be apparent from the following detailed description
when read in conjunction with the following drawings.
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2
[0006]
FIG. 1 shows various types of fibers.
FIG. 2A is a simplified longitudinal cross-sectional view of the transducer. FIG. 2B is an isometric
view of the surround. FIG. 3 is a simplified longitudinal cross-sectional view of the transducer.
FIG. 4 is a simplified longitudinal cross-sectional view of a round speaker having a passive
radiator. FIG. 5 is a plan view of various types of texture. FIG. 6 is a block diagram illustrating a
process for forming a suspension element. FIG. 7 is a prior art diagram showing the fibers before
and after heating.
[0007]
As used herein, "filament" refers to an object characterized by flexibility, fineness, and a fairly
high ratio of length to thickness (generally at least 100: 1 or more). Multiple filaments are
components for higher level elements, such as higher level elements, such as fibers, threads,
yarns, ropes, cords, cords, and the like. As used herein "fiber" comprises at least one filament, but
may comprise many filaments. Fibers are often used as the basic element to make textiles. Fibers
having only one filament so that the filaments and fibers are the same are monofilament fibers.
An example of a monofilament fiber is a monofilament fishing line.
[0008]
The multifilament fibers may be monofilament fiber bundles or staple fiber bundles. Fibers
having two or more monofilaments are referred to as "monofilament fiber bundles", and the two
or more monofilaments are used or processed (for example, woven) as a single fiber (for example,
wound on a spool) Are gathered to be able to Each fiber assembly is continuous from one end to
the other. If monofilament fiber bundles are broken into individual monofilament fibers, each of
the broken monofilament fiber bundles will be substantially the same length as or longer than
the bundle of fiber aggregates. The individual monofilament fibers of the monofilament fiber
bundle may be twisted or braided. An example of a structure resembling a monofilament fiber
bundle is a braided wire cable, in which the individual wires are similar to the individual
monofilament fibers. The ends of the monofilament fiber bundles are generally fused or
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constricted.
[0009]
As used herein, "staple fiber" refers to a fiber comprising filaments that may be shorter (or
substantially shorter) than the length of the fiber. Multiple filaments may be twisted or spun to
form multifilament staple fibers. Examples of multifilament staple fibers include cotton yarn and
yarn. Examples of monofilament fibers, monofilament fiber bundles, and staple fibers are shown
in FIG.
[0010]
FIG. 2A is a simplified longitudinal sectional view showing the configuration of the first
electroacoustic transducer. The round speaker 10A includes a cylindrical bobbin, and the first
end of the bobbin is mechanically connected to the acoustic diaphragm 14 by, for example, an
adhesive. The outer periphery of the acoustic diaphragm is mechanically connected by means of
a suspension element 16 to a frame represented here as mechanical ground. The voice coil
winding 18 is wound around the bobbin 15 to form the voice coil assembly 20. The voice coil
assembly 20 is disposed in the air gap 22 of the magnetic structure 24.
[0011]
The suspension element 16 which mechanically connects the outer periphery of the acoustic
diaphragm 14 to the frame is called "surround". Ideally, the surround allows movement in the
direction indicated by arrow 26, but blocks lateral movement indicated by arrow 28. The
arrangement of FIG. 2A is suitable for electro-acoustic transducers designed to move over short
distances and move relatively small amounts of air, such as miniature transducers (eg headphone
transducers).
[0012]
A typical geometric shape of the surround is a "semi-cylindrical" surround as shown in FIG. 2A.
Other common geometric shapes include many semi-cylinders, alternating uneven half-cylinders,
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and other complex geometric shapes. For example, in the surround 100 of FIG. 2B, the series of
grooves 125 make an angle with the radial direction, and more generally, relative to the normal
of the inner edge of the surround at the position of the groove closest to the inner peripheral
edge It extends from the inner circumferential edge 105 to the outer circumferential edge 110 at
an angle. The surround 100 comprises an inner mounting flange 115 and an outer mounting
flange 125.
[0013]
FIG. 3 shows a simplified longitudinal sectional view showing the configuration of the second
electroacoustic transducer. In the configuration of FIG. 3, the acoustic diaphragm has a truncated
cone shape. Similar to the arrangement of FIG. 2A, the outer periphery of the acoustic diaphragm
is mechanically connected by a suspension element 16 to a frame represented here as
mechanical ground. In the configuration of FIG. 3, the inner edge 32 of the acoustic diaphragm
14 is mechanically coupled to the first end 11 of the voice coil assembly 20, for example by an
adhesive. The end 11 of the voice coil assembly connected to the inner edge 32 of the acoustic
diaphragm is generally covered by a "dust cover" 35 which forms part of the acoustic emission
surface. The voice coil assembly 20 is mechanically coupled to a frame represented herein as
mechanical ground by a second suspension element 34, commonly referred to as a "spider". The
configuration of FIG. 3 is suitable for an electro-acoustic transducer designed to move over long
distances to move more air than the transducer of the configuration of FIG. 2A.
[0014]
A typical geometric shape of a spider is a wave pattern as shown in FIG. Similar to the suspension
element 16, the suspension element 34 allows movement in the direction indicated by the arrow
26 while blocking lateral movement to hold the voice coil assembly 20 within the magnetic air
gap 22.
[0015]
The configurations of FIGS. 2A and 3 operate in the same manner. The voice coil assembly 20
and the magnetic structure 24 function as a linear motor. The alternating current corresponding
to the audio signal in the voice coil winding interacts with the magnetic field in the air gap of the
magnetic structure, whereby the voice coil structure is moved along the axis indicated by the
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arrow 26. The motion of the voice coil causes the motion of the acoustic diaphragm 14. The
motion of the acoustic diaphragm 14 compresses and thins the air, causing a pressure wave to be
generated. The pressure wave is recognized as a sound.
[0016]
Passive radiators generally have surround and may have spiders in some complex geometry. FIG.
4 is a simplified longitudinal cross-sectional view of a round speaker with a passive radiator with
surround. The electro-acoustic transducer 110 is mounted within an opening in the housing 112,
similar to the electro-acoustic transducer of FIG. 3, for example. In addition, a passive radiator
structure including an acoustic diaphragm 14 whose outer peripheral portion is mechanically
connected to the housing 112 by the suspension element 16 is attached to the opening of the
housing 112. The electroacoustic transducer 110 operates in the manner described in the
description of FIG. The actuation of the electroacoustic transducer causes pressure fluctuations in
the housing 112. The pressure fluctuation causes the acoustic diaphragm to vibrate in the
direction of arrow 26. The vibration of the acoustic diaphragm compresses and dilutes the air,
causing pressure waves to be generated. The pressure wave is recognized as a sound. A passive
radiator with spider and surround is generally similar to the configuration of FIG. 4 without the
magnetic structure 24 and the voice coil 18, and possibly without the bobbin 15.
[0017]
Several properties are desirable for both the surround suspension element 16 and the spider
suspension element 34. Both the surround and the spider should correspond well to the direction
indicated by the arrow 26 (the intended direction of movement of the acoustic diaphragm) to
allow the desired amount of movement. Also, the surround and spider should be given a restoring
force to urge the acoustic diaphragm towards the neutral position. For maximum acoustic
performance, the restoring force should be linear in displacement. Both surround and spider
should have stiffness in the direction 28 orthogonal to the intended direction of motion. In the
case of the transducer, the magnetic air gap 22 should be as small as possible while being rigid
enough to hold the voice coil within the air gap. In the case of a passive radiator, it should be stiff
enough to resist lateral movement and to resist unwanted modes such as, for example, rocking
modes. That is, resilience should not be subject to excessive "break-in", ie, it should not change
with millions of hours or cycles of operation. Also, lightweight is a desirable property for both
surround and spider.
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[0018]
Some properties that may be important for surround may be less important or desirable for
spiders, and vice versa. For example, since the surround suspension elements may be part of the
emitting surface of the acoustic diaphragm, the surround generally needs to be pneumatically
sealed. On the other hand, it may be desirable for the spider to be "breathable". For spiders or
surround, or both, it may be desirable to be water resistant or detergent resistant, or both, and
for spiders it may be desirable to operate at relatively high temperatures.
[0019]
One class of materials that are desirable properties that are common to spiders and surround and
that can be easily modified to provide surround-specific or spider-specific properties are woven
of monofilament fibers It is a textile.
[0020]
Monofilament fibers are woven into fabrics having various weaves.
For example, FIG. 5 shows five different weave patterns: plain weave (also referred to as
"square"), twill weave, reverse plain twill weave, triaxial weave, tetraaxial weave.
[0021]
FIG. 6 shows a process for forming a suspension element by a woven fabric from monofilament
fibers. Block 40A will be described later. At block 42, the fabric is placed in the mold. The fabric
may be pre-coated but is non-impregnated as described below. At block 44, heat is applied to the
mold, thereby forming suspension element features, such as the surround features of FIGS. 2A
and 2B, or the waveform of FIG. The heat applied is sufficient not to melt but soften the
monofilament fibers so that the fibers can be joined but not fused where the fibers come in
contact. At block 46 the mold is cooled and at block 48 the suspension elements are removed
from the mold. At block 50, the suspension elements are trimmed to the desired shape and size.
[0022]
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The fabric may be coated with an elastomer or soft elastomer that does not fuse the
monofilament fibers at its intersections. The coating need not allow the fabric to maintain the
shape of the mold, so the coating may be applied at any convenient time, for example before
insertion into the mold such as block 40A. Alternatively, it may be applied after removal from the
mold such as block 40B or after trimming such as block 40C. Also, a coating may be applied to
the fibers prior to forming the fibers into a fabric.
[0023]
The coating material can change the properties of the fabric in various ways. For example, the
coating may seal the fabric with air pressure or hydraulic pressure, or both, change the damping
of the fabric, reinforce the fabric, change the shear modulus of the fabric, etc.
[0024]
The coating material should not be fragile. The particular material for the coating depends on the
properties of the monofilament fiber and the desired properties of the suspension element. As
mentioned above, the coating material need not provide the fabric with rigidity or formability, so
the material is quite flexible, for example with an elastic modulus of less than 100 megapascals,
or an elastic modulus of less than 1 megapascals. May be One class of materials useful for a wide
variety of transducer suspension elements that can be used for a wide variety of applications is
synthetic rubber.
[0025]
The coating can be applied in various ways. For example, the coating may be dissolved in a
solvent to immerse the fabric in the solution. The coating may be applied by a roller. The coating
may be sprayed on the fabric. The fabric can be masked prior to immersion, roller application
and spraying so that the thickness of the coating can be varied at the points on the suspension
element. For example, the thickness of the coating may vary depending on the radial distance
from the center. The fabric may be exposed to the airbrush after immersion, roller application or
spraying to allow the fabric to be breathable.
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[0026]
The pressure applied to the mold at block 42 stresses the fabric. The heat applied at block 42 is
sufficient to cause the fabric to relax and deform inelastically, which allows the shape of the mold
to be maintained when the fabric is removed from the mold. The heat is not sufficient to melt the
fabric so that the fibers fuse.
[0027]
The process of FIG. 6 has advantages over the process for forming a suspension element with a
conventional non-plastic staple fiber woven fabric. Conventional multifilament staple fibers do
not retain their shape when they are formed, so that conventional multifilament fibers are
impregnated with resin prior to formation in the suspension element as described above.
Alternatively, some conventional multifilament staple fibers may be made of one resin core and
the other, as described, for example, in US Pat. No. 5,878,150 and shown in FIG. It may be
impregnated in the form of a core / sheath structure with a resinous sheath. Suspension elements
formed of resin-impregnated fibers are hard and fragile, with the modulus of elasticity of the
resin being greater than or equal to about 1 Gigapascal, and often suffer from break-in problems
and are subject to fatigue (ie, suspension elements are Lose resilience with time and many
cycles).
[0028]
Also, the process of FIG. 6 may be performed using the melting temperature of the material for
weaving the fabric (or alternatively, the core may be as described in, for example, US Pat. No.
5,878,150 or FIG. 7). In the case of the / sheath structure, there are advantages compared to the
process for forming the suspension element, which comprises the step of heating the suspension
element to a temperature higher than the melting temperature of the sheath material). The fiber
intersections are fused by heating the suspension element to a temperature above the melting
temperature of the material. Fusion results in stress concentration points during use of the
suspension. In contrast, heating the suspension element made of monofilament fabric to a
temperature above the softening temperature but below the melting temperature allows the
fabric to be formed into the desired geometric shape, but Don't let the intersections cross.
Suspensions of monofilament textiles maintain the shape of the mold without the need for fiber
fusion, resin impregnation, or some additional coating.
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[0029]
There are numerous textiles suitable for the suspension element and monofilament fibers
suitable for being woven in the textile for the suspension element. Desirable properties include
high tensile strength, thermal stability, creep resistance, fatigue resistance, ductility, low
hygroscopicity, environmental stability, and the like. Examples of suitable materials include
polyetheretherketone (PEEK), polyethylene terephthalate (PET), sold as "Aptive (R) 1000-300"
from Victrex (URL: victrex. Com) And polyester sold as "MYLAR (registered trademark) A"
manufactured by DuPont, and polyphenylene sulfide (PPS) sold as "RYTON (registered
trademark)" manufactured by Chevron Phillips LLC.
[0030]
Table 1 shows some sample materials with melting and softening points.
[0031]
[0032]
It is desirable that the softening point be well above the transducer usage range, which is
typically in the range of 40-150 ° C.
[0033]
In one embodiment, the surround is formed of PET having a melting point of 254 ° C and a
softening point of 220 ° C.
The surround is placed in a mold, heated at 220 ° C. for 10 seconds, and cooled for 2 minutes.
The surround is coated with rubber including synthetic rubber.
In one example, the spider is formed of PET having a melting point of 254 ° C and a softening
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point of 220 ° C. The spider is placed in a mold, heated to 220 ° C. for 30 seconds, and cooled
for 2 minutes. Then the spider is coated with synthetic rubber.
[0034]
Uses and developments of the specific devices and techniques disclosed herein may be made
without departing from the inventive concepts. Accordingly, the present invention is to be
construed as encompassing each and every novel feature and novel combination of features
disclosed herein, and only by the spirit and scope of the appended claims. It is limited.
[0035]
Reference Signs List 10A round speaker 14 acoustic diaphragm 15 bobbin 16 suspension
element 18 voice coil 20 voice coil assembly 22 magnetic air gap 24 magnetic structure portion
34 suspension element 100 surround 105 inner peripheral edge 110 outer peripheral edge 125
groove portion
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