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JP2008131436

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Notice
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 JP2008131436
The present invention provides an edge for a speaker device which has a remarkable effect
particularly on peak dip reduction in middle and high frequency range. An edge for a speaker
device is characterized in that a substrate of the edge for a speaker device contains a fiber
composed of a polyketone represented by the following formula (1) in 95 mol% or more of the
repeating unit. [Chem. 1] [C.] None
Speaker device edge
[0001]
The present invention relates to an edge for a speaker device, and more particularly to an edge
for a speaker device having a peak dip reducing effect in the middle to high frequency range.
[0002]
The edge for the speaker device is a member in the speaker device of the sound output device,
and is fixed to the diaphragm (speaker cone) emitting the sound radially and the frame of the
speaker device body, and the outer peripheral portion of the diaphragm is elastically It is a
member to support.
Specifically, the inner peripheral edge of the edge is fixed to the outer peripheral portion of the
diaphragm, and the outer peripheral edge of the edge is fixed to the frame of the speaker device
body. The edge is required to have a function such as flexibility capable of following the
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movement of the diaphragm and a vibration absorbing property capable of absorbing
unnecessary vibration. Is formed. Patent Document 1 proposes an edge using an aramid fiber or
the like as the substrate of the edge for a speaker device, and although the durability is greatly
improved, no consideration is given to the reduction of peak dip.
[0003]
Unexamined-Japanese-Patent No. 2006-254159
[0004]
The present invention provides an edge for a speaker device which has a remarkable effect
particularly on peak dip reduction in middle and high tone ranges.
Furthermore, in the case of a speaker that is required to be water resistant, the polyketone fiber
can provide an extremely excellent water resistant edge because it has little water absorption.
[0005]
The present inventors arrived at the present invention as a result of earnestly examining in order
to solve the above-mentioned subject. That is, the present invention is as follows. (1) A speaker
characterized in that a substrate of an edge for a speaker device contains a fiber (hereinafter
referred to as a polyketone fiber) in which 95 mol% or more of the repeating unit is composed of
a polyketone represented by the following formula (1) Equipment edge. <img class = "EMIRef" id
= "202469926-00002" /> (2) A speaker device provided with the edge for a speaker device
according to the above (1).
[0006]
The present invention provides an edge for a speaker device having a peak dip reduction effect
particularly in the middle to high range.
[0007]
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The present invention is specifically described below.
In the polyketone fiber of the polyketone fiber of the present invention, 95 mol% or more,
preferably 98 mol% or more, particularly 99.6 mol% or more of the repeating unit is represented
by the above formula (1), and less than 5 mol% In the range, repeating units other than the said
Formula (1), for example, you may contain the thing etc. which are shown by following formula
(2). <img class = "EMIRef" id = "202469926-00003" /> where R is an organic group having 1 to
30 carbon atoms other than ethylene, and is, for example, a group such as propylene, butylene,
1-phenylethylene, etc. And some or all of the hydrogen atoms of R may be substituted with a
halogen group, an ester group, an amido group, a hydroxyl group or an ether group. Of course, R
may be of two or more types, and for example, a propylene group and a 1-phenylethylene group
may be mixed.
[0008]
The intrinsic viscosity [η] of the polyketone is preferably 1 dl / g or more, more preferably 2 dl /
g or more, particularly preferably 4 dl / g or more, and 20 dl / g or less, 15 dl / g or less, 10 dl /
g or less Is preferred. The intrinsic viscosity [η] is a value determined based on the following
definitional formula. In the formula, t and T are respectively the flow-through time of a viscosity
tube at 25 ° C. of hexafluoroisopropanol (manufactured by Central Glass Co., Ltd.) and a diluted
solution of polyketone dissolved in the hexafluoroisopropanol. C is the concentration of the
above diluted solution and is the mass (g) of polyketone in 100 ml of hexafluoroisopropanol. The
polyketone may optionally contain additives such as antioxidants, radical inhibitors, other
polymers, matting agents, UV absorbers, flame retardants, metal soaps and the like.
[0009]
Next, as preferable properties of the polyketone fiber, the tensile strength is 5 cN / dtex or more,
more preferably 10 cN / dtex or more, particularly preferably 15 cN / dtex or more, 30 cN / dtex
or less, and the tensile elongation is 3% Or more, more preferably 3.5% or more, particularly
preferably 4% or more, 8% or less, more preferably 7% or less, particularly preferably 6% or less,
and the tensile modulus is 100 cN / dtex or more, more Preferably, it is 200 cN / dtex or more,
particularly preferably 300 cN / dtex or more, and 1000 cN / dtex or less. The shape of the
polyketone fiber may be either short fiber or long fiber, and may be uniform or thick in the
length direction, and the cross-sectional shape of the fiber is round, triangular, L-shaped, Tshaped, Y-shaped Type, W type, octahedron type, flat (approximately flat with degree of 1.3 to 4,
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W type, I type, boomerang type, wave type, cocoon type, cocoon type, cuboid type, etc.), It may
be a dog bone type polygon, a multi-leaf type, a hollow type or an irregular type. The single yarn
fineness is preferably 0.01 to 10 dtex, more preferably 0.1 to 10 dtex, particularly preferably 0.5
to 5 dtex in the case of spun yarn or multifilament yarn, and 10 to 100,000 dtex in the case of
monofilament yarn. . Moreover, a preferable total fineness is 10-100000 dtex, More preferably, it
is 30-50000 dtex.
[0010]
The yarn form of the polyketone fiber is a spun yarn, a multifilament yarn, or a monofilament
yarn, and a spun yarn, a multifilament yarn, and particularly a spun yarn is preferable in order to
achieve the object of the present invention. The fiber length of the short fibers constituting the
spun yarn is preferably 20 to 1,500 mm, and even if the fiber length is a fixed length of about 20
to 76 mm, one having a fiber length distribution like a check cut spun yarn, for example, an
average The fiber length may be 70 mm or more, more preferably 100 mm or more, particularly
200 mm or more, further 250 mm or more, and 1500 mm or less, 1200 mm or less, or 1000
mm or less. Types of spun yarns include ring spun yarns, open end spun yarns, and bound spun
yarns.
[0011]
The present invention is characterized in that the substrate containing such polyketone fiber is
used as an edge substrate. The substrate containing polyketone fiber may be composed of 100%
polyketone fiber, but preferably fibers other than polyketone fiber may be used within the range
of 50% by mass or less, and polyester fiber, polyamide fiber, acrylic fiber , Known aromatic fibers
such as wholly aromatic polyester fiber, polyphenylene sulfide fiber, polyimide fiber, aramid fiber
(para system, meta system), polyvinyl alcohol fiber, poly (p-phenylene benzo bis oxazole) fiber,
ultra high molecular weight polyolefin fiber, etc. You may As the form of mixing, mixed
papermaking, mixed spinning, composite spinning (silo span, silofil), mixed fiber, twisting,
composite bulking (temporary twisting, fluid jet processing, etc.), cross knitting (for example,
warp and / or weft in the case of woven fabrics) A well-known means, such as 1-5 mixed ones
alternately, can be used. Furthermore, the fibers constituting the fabric (polyketone fibers and
mixed fibers) may be softened or melted by pressure and / or heating means to be adhered or
fused, as desired.
[0012]
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The substrate is a fiber sheet such as paper, non-woven fabric or knitted fabric, and as the
knitted fabric, woven fabric such as flat, line flat, rattan, ladder, imitation, entanglement, warp
knitting, weft knitting (horizontal, round) And knitted fabrics. The edge for a speaker device
according to the present invention uses such a fiber sheet as a base, and as an excipient, a
thermosetting resin such as phenol resin, melamine resin, unsaturated polyester resin,
thermosetting polyether urea elastomer, The plastic resin is impregnated and dried, and one side
or both sides thereof is coated with (or laminated with) an elastic material such as rubber such as
styrene butadiene or urethane. Then, after drying, it is pressure-formed into a predetermined
shape in a mold under heating. Subsequently, it is punched into an annular shape to produce an
edge. As the excipient, such a thermosetting resin is generally used, but if desired, a polyester
resin which is cured by a crosslinking agent such as melamine may be used. The proportion of
the excipient is preferably about 15 to 40% by mass in dry mass with respect to the fabric.
[0013]
Examples of fibers constituting the substrate of the diaphragm to which the edge is fixed include
polyketone fibers and aramid fibers exemplified as fibers mixed with the above-mentioned
polyketone fibers, and fibers constituting the substrate of such a diaphragm are also polyketones.
The fiber may be integrally formed with the edge, and the excipient used for both substrates may
be the same resin or a different resin. For example, an unsaturated polyester resin is used for the
diaphragm and the edge is used for the edge A photocurable resin may be used. For example,
when it is feared that the tensile strength of the polyketone fiber may be lowered by receiving
strong ultraviolet light outdoors, for example, an ultraviolet absorber (for example,
benzophenone type, benzotriazole type, hindered amine type) in the form of fiber or fiber sheet.
Or there is a combination of two or more. And / or ultraviolet light shielding agents (for example,
fine particles of titanium oxide, iron oxide, cerium oxide, etc.), and the average particle diameter
is preferably 0.01 to 0.6 μm. ) May be contained. As a method of containing it, for example,
there is a method of applying or covering a resin or a film containing an ultraviolet absorbing
material and / or an ultraviolet shielding agent to a fiber or fiber sheet, and the content of the
ultraviolet absorbing material and / or the ultraviolet shielding agent And 0.001 to 10% by mass
based on the mass of the resin or film.
[0014]
The present invention will be more specifically described based on examples and the like, but the
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present invention is not limited to these examples and the like. The measuring method and
evaluation method in the present invention are as follows. (1) Tensile strength, tensile elongation,
tensile modulus of elasticity Measured according to JIS-L-1013. The sample length is 20 cm, the
tensile speed is measured at 20 cm / min, and the average value of 20 measurements is obtained.
(2) Evaluation of frequency-sound pressure characteristics The sound pressure (dB) at a
frequency of 100 to 20,000 Hz is measured according to a conventional method in a 16 cm
aperture speaker using the manufactured edge, and particularly the sound in the range of 2000
to 10,000 Hz The change in pressure was evaluated. ○: Change in sound pressure is less than 10
dB. ;; change in sound pressure is 10 to 20 dB. Change in sound pressure is 20 dB or more.
[0015]
[Example 1] Polyketone fiber of 1670 dtex / 1250 f (manufactured by Asahi Kasei Corp .; trade
name: Saibaron; tensile strength 18 cN / dtex, tensile elongation 5%, tensile elastic modulus 350
cN / dtex) According to the conventional ring spinning method, a ring spun yarn of 275 dtex was
obtained. The obtained spun yarn was used for warp and weft to obtain a plain weave fabric
having a warp density and a weft density of 38 / 2.54 cm. Next, the obtained woven fabric is
impregnated with a phenol resin, dried, and then coated with a urethane rubber, and after drying,
an Ω-shaped elastic portion is formed by a heat pressing process. Then, a punching edge was
produced in an annular shape by a punching process. The evaluation of the frequency-sound
pressure characteristics of the obtained edge was ○, which was excellent. The moldability and
the dimensional accuracy of the molded product were also excellent. Comparative Example 1 In
Example 1, 1670 dtex / 964 f para-aramid fiber multifilament yarn (tensile strength 20 cN /
dtex, tensile elongation 4.5%, tensile modulus 500 cN / dtex) was substituted for polyketone
fiber. An edge was produced in the same manner as in Example 1 except that it was used. The
evaluation of the frequency-sound pressure characteristics of the obtained edge was Δ, which
was inferior to Example 1.
[0016]
The present invention provides an edge for a speaker device that has a remarkable effect
particularly on peak dip reduction in middle and high tone ranges. Furthermore, for example, in
the case of a speaker attached to the door of an automobile where water resistance is required,
the edge is susceptible to water by rainwater from the window and water leakage at the time of
car washing, but polyketone fiber has water absorbency Since there is almost no, it is possible to
provide an edge with extremely excellent water resistance.
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