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JPH06153292

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DESCRIPTION JPH06153292
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge material, a speaker diaphragm and a speaker free edge cone comprising an edge
bonded to at least the outer periphery of the diaphragm.
[0002]
2. Description of the Related Art When a speaker edge cone currently used is roughly classified, a
fixed edge cone in which the edge and the speaker diaphragm are integrally made of the same
material, and the edge and the speaker diaphragm are separately made. There is a free edge cone
in which these are laminated and integrated. Free-edge cones are mainly used in recent high-fi
speaker units.
[0003]
The edge provided on the outer peripheral part of the speaker diaphragm supports the function
of holding vibration system parts such as voice coil and diaphragm at the correct position, the
function of preventing acoustic short circuit of the sound generated before and after the
diaphragm, voice It has a function as an acoustic termination that does not reflect the vibration
generated in the coil at the edge. As the performance required for the edge to perform such a
function, (a) have a sufficiently high compliance in the vibration axis direction of the diaphragm
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(b) have a sufficient rigidity for the lateral movement of the diaphragm (C) The linearity of the
drive system-displacement characteristic is good up to the large amplitude region (d) no edge
resonance or inversion vibration causing abnormal radiation (e) lightness as a vibration system
component etc. It can be mentioned.
[0004]
Conventionally, the material of the edge material of the free edge cone for a speaker is paper
impregnated with phenol resin or melamine resin and further blocked with an acrylic resin, NBR
or the like, woven fabric or nonwoven fabric, plastic film, urethane foam And plastic sheets, etc.,
hide leathers such as deer leather and goat leather, and rubber sheets. Among these, foamed
urethane sheets and woven fabrics are often used.
[0005]
[Problems to be solved by the invention] Edges using a urethane foam sheet as the edge material
are less likely to cause edge resonance and reverse vibration, and the linearity of driving forcedisplacement characteristics in a large amplitude region is also good. Without the directionality
caused by the warp and weft, the following disadvantages of the woven edge can be solved and
the sound quality of the loudspeaker is improved. However, the edge made of the urethane foam
sheet has problems in rigidity and weather resistance.
[0006]
The edge using a woven fabric as the edge material satisfies the above-mentioned required
performance that the vibration system parts have appropriate rigidity and light weight, but the
thickness of the woven fabric is thin and the internal loss of acoustic vibration is low. There is a
problem that edge resonance and reverse vibration easily occur and the driving forcedisplacement characteristic becomes non-linear in a large amplitude region, and distortion from
the speaker using the woven edge is increased. In order to solve this problem, conventionally, a
visco-elastic edge paint is applied to the edge surface. However, such a solution increases the
number of manufacturing steps and increases the manufacturing cost.
[0007]
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In addition, when using a woven fabric, the woven fabric is made of warp yarns and weft yarns,
so it has directionality, which causes turbidity of the sound from the speaker. Furthermore, the
texture of the cloth is clearly recognized on the edge of the completed speaker free edge cone,
which is not preferable in appearance.
[0008]
The edge using a non-woven fabric as the edge material has appropriate rigidity and has a
suitable thickness so that there is no directivity of the warp and weft, so the problem of the
woven edge described above can be solved.
[0009]
However, non-woven fabrics using chemical fibers such as polyester and nylon have a problem in
heat resistance that the chemical fibers themselves become hard at the time of thermoforming of
the edge, and furthermore, the binder used in the non-woven fabric also hardens.
In addition, non-woven fabrics using cellulose-based chemical fibers (such as rayon) have high
water absorbability, a high rate of shrinkage when wet, and a marked reduction in strength.
[0010]
In addition, since a binder is used for a non-woven fabric made of cotton, there is also a problem
that the binder is cured at the time of heat molding of the edge, and as a result, the edge becomes
hard. In addition, there is also a problem that the distribution of the binder in the nonwoven
fabric is generally nonuniform.
[0011]
Furthermore, the conventional non-woven fabric has a problem that the appearance of the nonwoven fabric is not so good, because dot-like pressing marks and streak-like pressing marks are
left during the production of the non-woven fabric.
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[0012]
Therefore, an object of the present invention is to provide a speaker edge material in which the
edge does not become hard at the time of thermoforming of the edge while taking advantage of
the non-woven fabric, and a speaker free edge cone using such edge material .
Another object of the present invention is to provide a speaker free edge cone which can be
easily manufactured at low cost.
[0013]
SUMMARY OF THE INVENTION In order to achieve the above object, the edge material of the
speaker of the present invention is characterized by impregnating or applying a molding resin to
a cotton non-woven fabric not using a binder. I assume. The edge material of the speaker may or
may not be impregnated with a resin for hardness control.
[0014]
The free edge cone for a speaker according to the present invention comprises a speaker
diaphragm and an edge bonded to at least the outer peripheral portion of the diaphragm. And in
order to achieve the above-mentioned purpose, the edge is characterized by consisting of an edge
material which made resin for molding resin impregnate or coat a cotton non-woven fabric which
does not use a binder.
[0015]
As a molding resin, synthetic rubber materials such as acrylic resin, urethane resin, acrylic /
nitrile / butadiene rubber (NBR), styrene / butadiene rubber (SBR), MBR, IIR, CR, etc. are used for
cotton fabric The resulting resin can be used. Moreover, as resin for hardness adjustment,
thermosetting resins, such as phenol resin, an epoxy resin, and melamine resin, can be used, for
example.
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[0016]
The thickness of the cotton non-woven fabric and the amount of impregnation of the molding
resin depend on the size and characteristics of the required speaker free edge cone.
[0017]
The material of the speaker diaphragm may be a conventionally used material such as paper and
mixed paper subjected to various treatments, cloth, various plastics, rubber, metals, various
composite materials, and the like.
[0018]
The shape of the diaphragm for the speaker is conical cone (straight cone), curved cone,
parabolic cone, high cut cone, double cone, cone without top processing cone, folded cone,
conical cone cone, eccentric cone etc. It can be shaped.
In addition, the speaker diaphragm can be corrugated on one side or both sides.
[0019]
The edge is bonded to at least the outer periphery of the speaker diaphragm.
That is, with the inner peripheral portion of the edge extending from the outer end of the speaker
diaphragm by a predetermined distance toward the center direction of the speaker diaphragm
over the entire outer peripheral portion of the speaker diaphragm. The inner periphery of the
edge and the outer periphery of the speaker diaphragm may be bonded. Alternatively, the inner
periphery of the edge may cover the entire area of the speaker diaphragm. The edge made of an
edge material and shaped into a predetermined shape can be bonded to the speaker diaphragm
by an adhesive. Alternatively, by performing a thermoforming process in a state in which a flat
ring-shaped edge in which an edge material is impregnated with a thermosetting resin having
adhesiveness in advance and a speaker diaphragm that is shaped in advance are held in a
molding die. The shaping of the edge and the bonding of the edge and the speaker diaphragm
can be performed simultaneously.
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[0020]
The shape of the edge may be a conventional edge shape, such as flat edge, corrugated edge, up
roll edge, down roll edge, V edge, scored edge, etc.
[0021]
The edge material of the present invention is formed by impregnating or coating a molding nonwoven fabric with a non-binder cotton resin.
Therefore, it is possible to solve the problem of the woven fabric edge and the problem of the
foamed urethane sheet edge, and to exhibit the same performance as the foamed urethane sheet
edge. Furthermore, since the non-woven fabric is made of cotton and does not use a binder, the
edge material can be prevented from becoming hard when the edge is heat-formed.
[0022]
The present invention will be described in more detail with reference to the drawings.
[0023]
FIG. 1 is a perspective view of a speaker free edge cone 1 according to the present invention.
The speaker free edge cone 1 comprises an edge 10 and a speaker diaphragm 20. The edge 10 is
made of an edge material in which a molding resin is impregnated or coated on a non-bindable
cotton non-woven fabric.
[0024]
FIG. 2 is a cross-sectional view of the speaker free edge cone 1. The shape of the edge 10 shown
by way of example in FIG. 2 is a down roll edge, and the shape of the speaker diaphragm 20 is a
curved cone. The outer periphery 12 of the edge 10 is fixed to the frame (not shown) of the
speaker.
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[0025]
FIGS. 3A to 3D show partial cross-sectional views of the speaker free edge cone of the present
invention different from FIG. 2 having various edge shapes. 3A is flat edge, FIG. 3B is corrugated
edge, FIG. 3C is up roll edge, and FIG. 3D is V edge. It shows each. FIG. 3E is a perspective view
showing a part of the speaker free edge cone of the present invention having a cut edge with a
cut 14.
[0026]
(A) to (E) of FIG. 4 and (A) to (E) of FIG. 5 schematically show an outline and a partial crosssectional view of a speaker diaphragm having various shapes. 4 (A): conical cone (straight cone),
FIG. 4 (B): parabolic cone, FIG. 4 (C): high cut cone, FIG. 4 (D): double cone, Fig. 4 (E) shows the
top unprocessed cone, Fig. 5 (A) shows the folded cone, Fig. 5 (B) shows the conical dome cone,
Fig. 5 (C) shows the eccentric cone, (D) of FIG. 5 shows a curved cone with single side
corrugation, and (E) of FIG. 5 shows a curved cone with double side corrugation, respectively.
[0027]
The edge material of the speaker of the present invention and the free edge cone for the speaker
were manufactured according to the method described below.
[0028]
A curved diaphragm-shaped speaker diaphragm 20 having a cross section shown in FIG. 2 and
made of cone paper with an average thickness of 0.3 mm was prepared.
The outer diameter and the inner diameter of the speaker diaphragm 20 were 70 mm and 21
mm, respectively.
[0029]
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A bleached, plain cotton non-woven fabric (for example, Nisshinbo Co., Ltd .: trade name Oikos)
having an average thickness of 0.35 mm and a basis weight of 60 g / m 2 was prepared. No
binder is used in this cotton non-woven fabric. An edge material was prepared by impregnating
or coating this cotton non-woven fabric with a molding resin comprising an acrylic resin, a
urethane resin, or a synthetic rubber material such as NBR, SBR, MBR, IIR or CR. Specifically,
using a bed coating apparatus or a kiss coating apparatus, a molding coating solution consisting
of SBR, silicone resin-based release agent, silicone resin-based water repellent agent, thickener,
and pigment, both sides of a cotton non-woven fabric Coated (impregnated) and dried. The cotton
non-woven fabric after drying was 160 g / m 2. Since the molding resin also serves as a filler for
the cotton non-woven fabric, there is no need to separately apply a filler to the cotton non-woven
fabric, and the manufacturing process can be simplified. Thus, a speaker edge material was
produced by impregnating or applying a molding resin to a cotton non-woven fabric not using a
binder.
[0030]
The cotton non-woven fabric may be impregnated with a resin for adjusting hardness before
being impregnated or coated with a molding resin. The resin for adjusting hardness comprises,
for example, a phenol-based resin solution and a melamine-based resin solution. The cotton nonwoven fabric can be impregnated with the resin for adjusting the hardness by dipping the cotton
non-woven fabric in a solution of the resin for adjusting the hardness and then drying off the
solvent. By impregnating a cotton non-woven fabric with a resin for adjusting the hardness, the
hardness of the finally obtained edge can be adjusted, and as a result, the frequency
characteristics of the speaker can be controlled.
[0031]
The edge material was then stamped out to obtain a flat ring-shaped pre-formed edge having an
outer diameter of 100 mm and an inner diameter of 59 mm.
[0032]
Next, the edges before molding were placed on the speaker diaphragm 20, and these were set in,
for example, a down roll edge molding die, and thermoforming was performed at 160 to 240 °
C. for 4 to 10 seconds.
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The radial length of the edge overlapping with the speaker diaphragm was 4.5 mm.
[0033]
The molding resin impregnated or coated in the edge material is cured by the thermoforming
process, and the edge is given a suitable rigidity to shape the edge into a predetermined shape.
At the same time, part of the molding resin flows out to the surface of the edge and firmly bonds
the edge to the speaker diaphragm.
[0034]
Although the edge material and the speaker free edge cone of the speaker according to the
present invention have been described above based on a preferred embodiment, the present
invention is not limited to the above materials, materials and various numerical values.
Depending on the characteristics required for the speaker free edge cone, the thickness and basis
weight of the cotton non-woven fabric, and the type and amount of impregnation of the molding
resin can be appropriately selected. In addition, the molding resin may be coated on one side of
the cotton non-woven fabric.
[0035]
The overlapping portion of the edge and the speaker diaphragm can be extended to a
considerable area or the entire area of the speaker diaphragm. In order to firmly fix the speaker
free edge cone to the frame of the speaker, a paper gasket can be bonded to the lower surface of
the outer periphery 12 of the edge of the speaker free edge cone. Bonding of the gasket to the
edge can be performed simultaneously with bonding of the edge and the speaker diaphragm in
the molding die.
[0036]
As the edge material of the present invention, a cotton non-woven fabric is used. Therefore, the
speaker free edge cone of the present invention can exhibit performance equivalent to that of the
urethane foam sheet edge. That is, the edge material gives a sufficiently high compliance in the
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direction of the vibration axis of the speaker diaphragm, and gives sufficient rigidity to the lateral
movement of the speaker diaphragm. And it is excellent in the linearity of a driving forcedisplacement characteristic to a large amplitude area | region, an edge resonance and a reversal
vibration are not produced, and weight reduction can be achieved. Moreover, the rigidity and the
weatherability, which are the disadvantages of the urethane foam sheet edge, can be improved.
[0037]
When a woven fabric is used as the base material, sound turbidity occurs due to the directionality
of the woven fabric due to the warp and weft, but according to the present invention, a cotton
non-woven fabric is used as the edge material. The cotton non-woven fabric has no directionality,
so it can prevent the sound from being clouded from the speakers. Moreover, the surface of the
edge is smooth and excellent in appearance. In addition, since the non-woven fabric is made of
cotton and no binder is used, hardening of the fiber material or the binder during heat molding
of the edge can prevent the edge from becoming hard. Furthermore, as compared with the
conventional speaker free edge cone, it is easy to manufacture, and the manufacturing cost can
be reduced.
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