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JPH04207899

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DESCRIPTION JPH04207899
[0001]
INDUSTRIAL APPLICABILITY The present invention relates to the provision of a speaker device
having high efficiency and high fidelity in sound reproduction. In a speaker device widely used as
one of the means for reproducing voice or the like recorded or transmitted by various audio
devices etc., it is important how faithfully the voice or the like recorded or transmitted is to be
reproduced. It is considered an element. From the point of scratching, it is necessary to have, for
example, high conversion efficiency, as little distortion as possible, nearly horizontal and
extended frequency response characteristics in measurements using a sinusoidal waveform, and
also dynamic close to actual use conditions With the addition of the test waveform, it has been
attempted to make it a highly efficient and faithful speaker device as long as its response
characteristics are measured. From the point of view, the so-called direct radiation type speaker
that radiates the sound wave directly from the diaphragm according to the usage form of the
speaker, etc., the cone speaker that emits direct sound, the horn speaker that emits the sound
wave through the dome speaker or the horn So-called electrokinetic type speaker or an electric
charge accumulated on the vibrating membrane is applied an alternating voltage to generate an
alternating electric field, and the electric field on the vibrating membrane causes a Coulomb force
to cause the vibration of the vibrating membrane. Attempts have been made to develop so-called
electrostatic type speakers such as condenser speakers. [Problems to be Solved by the Invention
and Problems] However, in spite of various improvements, in the conventional speaker device,
the vibrating parts or the resonant parts constituting the speaker device are uniformly and
planar on the vibrating surface. Since the vibration of air is induced to the air, the generated
sound is greatly influenced by the material characteristics of the vibrating parts or resonant parts
constituting the speaker device or the shape characteristics of the surface, etc. Showed a
tendency to be a hard voice with little Also, in the conventional speaker, the sound wave
generated from the vibrating part or the resonance part constituting the speaker device is
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reflected on the surface of each part constituting the speaker device, and the reflected sound
wave is the vibration part mentioned above Alternatively, the sound wave may be transmitted as
a sound wave delayed from the sound wave generated from the resonance parts etc., and there is
a disadvantage that the faithful repeatability is significantly impaired.-The speaker device to be
used in the present invention is a conventional speaker according to the present invention In
view of the inconvenience in the device, by making each component constituting the speaker, in
particular the vibration surface of the vibration component or the resonance component, into a
special porous structure, the direction of the generated vibration is made unlimited and the
reflection of the generated vibration wave It is an object of the present invention to provide a
speaker in which it does not occur between the components of the speaker device.
[Means for Solving the Problems] In order to achieve the above object, in the speaker of the
present invention, a resin film is provided on all or part of the component surface of at least a
part of the parts constituting the speaker device At the same time, this resin film is provided with
removal holes for seratin powder which belong to a range in which the number average
molecular weight is smaller than 8.500. [Operation] Since a resin film is formed on the surface of
the component constituting the speaker device, the removal film of seratin powder having a
number average molecular weight in a range smaller than 8.500 is provided. If the part is a
vibrating part or a resonant part of a speaker device, the generated vibration will produce a nondirectional sound wave. In addition, since the removal mark hole of seratin powder having a
number average molecular weight smaller than 8.500 is provided on the surface of the
component constituting the speaker device, the sound generated in the speaker device is The
amount of reflection is eliminated by eliminating the surface of the parts constituting the speaker
device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A typical embodiment of a
speaker device according to the present invention will be described in detail. The target speaker
device is a horn speaker that emits a sound wave through a horn, even if it is a so-called direct
radiation speaker such as a cone speaker that radiates a sound wave directly from a diaphragm,
or a dome speaker as a speaker. It may be a so-called condenser speaker of an electrostatic type.
The components that make up the speaker device include a speaker, a baffle for mounting the
speaker, a cabinet, and the like, and various cushioning members that are stretched inside the
cabinet. Further, the cabinet having the speaker includes a back open type cabinet, a closed type
cabinet or a bass reflex type cabinet and the like. The outlines of the target parts constituting the
speaker device will be further described separately. First, in a so-called cone speaker that vibrates
a cone-shaped diaphragm currently most practically used to emit sound waves, a surface of the
cone or a frame for mounting the cone, a dustproof cover for covering the cone surface,
Furthermore, components of the speaker such as an edge and a damper, a baffle for assembling
the speaker, various cabinets, and the like are the target components of the speaker device
according to the present embodiment. Further, in the dome speaker, the dome and the parts
constituting the cone speaker are included together with the parts attached to the dome.
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The dome may be made of paper, metal such as germalmin, plastic such as polyester resin, or
cloth impregnated with plastic. In addition, in the horn speaker, the horn and the components
attached to the horn are included together with the components constituting the abovementioned cone speaker. Furthermore, a capacitor speaker, also referred to as an electrostatic
type speaker, similarly includes a vibrating membrane and components of a speaker device using
the vibrating membrane. The resin film 2 is provided so as to cover the entire surface or a part of
the surface of all or part of the component 1 constituting the various speaker devices having
such a configuration. The resin film 2 is well compatible with the component 1 on which the
resin film 2 is formed, and it is preferable to use one that does not impair the vibration
characteristics of each component 1. The resin film 2 of this type is preferably formed as a
coating film of a synthetic resin-based paint, as a coating film of a synthetic resin-based coating
liquid, and as a laminate layer of a synthetic resin-based laminate film. In addition, the coating
film of the synthetic resin-based paint may be formed by any method such as a method of brush
coating, a method of spraying, and a method of pickling. Moreover, when the target component 1
is a cloth or the like, the coating film may be formed by impregnating in the cloth cloth. Also, the
coating film may be formed by a method of toktor-knife coating, a method of pickling by dipping,
or any other method. Alternatively, a laminate film may be separately formed on a release paper,
and the laminate film on this release paper may be formed by a transfer method, or directly
laminated on the surface of the part 10 without using a release paper. Also good. Alternatively, it
may be formed by the method of heat fusion with a laminate film or part 1. Thus, the resin film 2
formed to cover the surface of the part 1 has the holes 4 which are removal traces of the gelatin
powder 3 which belongs to the range where the number average molecular weight is smaller
than 8,500. This resin skin! Holes 4 which are removal traces formed in 2 are comprised of
removed trace holes of gelatin powder, particularly gelatin powder 3 having a number average
molecular weight of less than 8,500. Thus, by making the removal mark hole 4 formed in the
resin shell M2 into the removed mark hole of the gelatin powder 3 belonging to the range in
which the number average molecular weight is smaller than 8.500, in particular, the sound of the
speaker device The properties are particularly good. That is, it is preferable that the holes 4 of
the trace removed of the gelatin powder 3 formed in the resin film 2 have a uniform hole
diameter and be uniformly distributed, and the hole 4 should be The smaller the hole diameter,
the better the acoustic characteristics of the speaker device.
In order to form the characteristic pores 4, it is necessary that the gelatin powder 3 removed
from the resin shell M2 has a number average molecular weight of less than 8.500. The reason
for forming the removal trace hole 4 of the gelatin powder 3 in the resin film 2 using the gelatin
powder in which the number average molecular weight is smaller than 8.500 in S is as follows.
That is, commercially available gelatin powder has a particle size or unevenness, and has the
disadvantage that the particle size is too large. When this commercially available gelatin powder
is used as it is in the form of S, it is formed. It was not possible to obtain a coated film or the like
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having a sufficient water pressure resistance as compared to the required moisture permeability
due to the formation of an excessively large hole in the coated film or the like. In addition, when
a gelatin powder having a particle diameter too large is used, it is necessary to thicken a coated
film or the like to be formed, and it is not possible to obtain a required coated film or the like
having moisture permeability and air permeability. It was found that it is desirable that the
gelatin powder contained in the coated film or the like formed from many experiments be finer
and that the gelatin powder be in a certain range. Therefore, the present inventor has carried out
mass production of gelatin powder which is mixed with resin and used by using a commercially
available gelatin powder, using a jet mill. Grinding using this jet mill, the ground gelatin powder
could be classified in the course of grinding, and was suitable for obtaining ground particles
having a uniform particle size range. However, in the case of pulverization of gelatin powder by
dry pulverizing means using this jet mill, the pulverized gelatin grains become cohesive with one
another, and the pulverization itself is impossible, or the pulverized gelatin grains are bound to
the inner wall surface of the pulverizer And other problems. Therefore, the inventors of the
present invention made the inside of the grinder an atmosphere of extremely low humidity, and
crushed the gelatin powder in a state where the water content of the gelatin powder to be
introduced into the grinder was removed as much as possible. The improvement of the method of
grinding made it possible to grind and classify the gelatin powder, and it was possible to obtain a
ground gelatin powder having a range of fine particle sizes. However, the amount of ground
particles obtained by this improved jet mill grinding method was very small and was practically
meaningless, although experimentally possible. Also, with this improved jet mill grinding method,
water is further removed from the ground seratin in the course of grinding, so that the grinding
time is prolonged, the ground gelatin particles are denatured, and elution with water or water is
possible. It was gone, and it was hard to put to practical use from this point.
Therefore, the inventors of the present invention put gelatin powder together with an organic
solvent such as dimethylformamide into a wet crusher such as a wet hole mill, and tried to crush
the gelatin powder as an atmosphere in which the inside of the wet crusher was dried. In the
grinding of gelatin powder using this wet ball mill, the fact that the water content of the ground
gelatin powder does not increase at the same time causes the ground gelatin particles to
agglomerate with each other and also bonds to the inner wall surface of the grinder. I could grind
it efficiently without any problems. However, in the grinding of gelatin powder using this wet
hole mill, the particle size of the ground gelatin particles is extremely irregular, and the ground
gelatin particles having a particle diameter close to that of the input material powder and the fine
particle diameter of less than 1.5 μm It had the disadvantage that it was mixed with the ground
gelatin powder at a constant ratio. In the grinding of gelatin powder using only wet wet ball
milling, by changing the grinding conditions, the average particle size of the obtained ground
gelatin particles can be optionally reduced, along with the reduction of the average particle size
of the ground gelatin particles. The variation in particle diameter is more pronounced, which
makes it difficult to put it into practical use. In the method of grinding gelatin powder using a wet
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ball mill, if the large diameter gelatin particles contained in the ground gelatin particles are
eliminated, it is necessary to set the grinding time longer. Milled gelatin grains that do not
contain gelatin grains will contain many "over-milled" gelatin grains. The over-milled gelatin
particles, particularly gelatin particles of less than 1 μm, may not bring about the characteristic
properties of gelatin to the formed coating film etc. when used in combination with a resin, and
the formed coating film There are drawbacks such as inability to elute from etc., and crushed
gelatin particles ground by a wet ball mill having a large amount of over-ground gelatin particles
are difficult to put to practical use. Therefore, in the present embodiment, gelatin used for
pulverization belongs to a range in which the number average molecular weight is smaller than
8.500, and the particle size of gelatin powder obtained by pulverization is made uniform and it is
easy to take out from resin film 2 . The average molecular weight used in the present
specification is used in the meaning of number average molecular weight, which is the value
obtained by dividing the total mass of molecules by the total number of molecules. Further, the
molecular weight is the mass of a molecule which is a unit having a mass of CI 2 atoms as 12.
One of the practical and preferred gelatin powder particle sizes used in this example is an
average particle size of 3 μm to 55 μm ('/,. o mm is expressed as μm in the present
specification. Preferably, it is a gelatin powder having an average particle size consisting of one
numerical value specified within the range of, for example, an average particle size of 432 μm,
389 μm, 4.44 μm, 477 μm.
The particle diameter used in the saw is measured by centrifugally settling the gelatin powder in
a dispersion of gelatin powder dispersed in ethanol, and is shown as being determined from the
measurement volume. The average particle size refers to the particle size of the cumulative
distribution corresponding to 50% by weight as an average particle size. Then, the particle size
distribution of practical and preferred gelatin powder is that gelatin powder with a diameter
larger than 9 μm is effectively removed and gelatin particles with a diameter larger than 9 μm
are less than 10 wt% with respect to the total amount of gelatin powder. Is a preferred
embodiment. Furthermore, the particle size distribution of a practical and preferred gelatin
powder is such that the gelatin powder having a particle size within the range smaller than 15
μm is effectively removed, and the diameter smaller than 1.5 μm with respect to the total
amount of gelatin powder. It is a preferred embodiment that the gelatin powder is less than
Owt%. Next, typical gelatin powders of the present invention will be described in more detail. The
gelatin powder is obtained by pulverizing and classifying seratin having an average molecular
weight in the range of less than 8.500 by a method of dry pulverization. In particular, gelatin
powder used in this method is obtained by hydrolyzing a commercially available gelatin derived
from collagen-derived protein such as gelatin to a collagen-derived protein) using an enzyme acid
and an alkali as a raw material, and this polypebutite is used as a raw material It is preferable to
grind using a method of dry grinding such as a jet mill, and gelatin having an average molecular
weight smaller than 8.500 is used as a grinding raw material. In particular, in this example, after
commercially available gelatin is hydrolyzed with an enzyme, an acid, and an alkali, the average
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molecular weight of 1.500 to 8.500 is obtained by spraying and drying from a nozzle in a hot air
of about 120 ° C. Is used. In addition, when the gelatinous coarse powder to be crushed has
already been adjusted to an average molecular weight of 1.000 to 8.500 by hydrolysis, it is to be
crushed as it is without further hydrolysis treatment. Used as gelatin coarse powder. The gelatin
powder as the raw material to be ground is crushed using a dry grinding method such as a jet
mill to obtain gelatin particles ground into fine particles. In grinding of this gelatin coarse
powder, gelatin coarse powder having an average molecular weight smaller than 8.500 has
extremely excellent grindability with respect to gelatin coarse powder having an average
molecular weight larger than 8.500. On the other hand, a gelatin coarse powder having an
average molecular weight of more than 8.500 has an extremely small amount of grinding per
unit time and can not be used for inexpensive mass production of fine gelatin powder.
The grinding characteristics per unit time of this gelatin coarse powder are better as the average
molecular weight of the gelatin coarse powder to be ground is smaller, and from the aspect of the
milling efficiency per unit time, the average molecular weight is greater than 8.500 It is
preferable that it is gelatin which belongs to a small range. One grinding characteristic of this
gelatin coarse powder which makes the average molecular weight different is that when the
amount of grinding with gelatin coarse powder having an average molecular weight of 1.000 is
100% by weight, the gelatin coarse particle with an average molecular weight of 3.000 is It is
84% by weight in powder, 80% by weight of gelatin coarse powder with an average molecular
weight of 5.000, 76% by weight of gelatin coarse powder with an average molecular weight of
7,000, 62% by weight with an average molecular weight of 8.500 there were. From this, even a
gelatin coarse powder with an average molecular weight of 8.500 can be crushed sufficiently
efficiently. On the other hand, in the case of grinding of a gelatin coarse powder having an
average molecular weight of 1O1000, it is only 28% by weight when the grinding amount of the
above-mentioned gelatin coarse powder having an average molecular weight of 1.000 is
squeezed at 100% by weight, and further 13.000 The grinding amount per unit time in grinding
of the gelatin coarse powder is only 16% by weight of the grinding amount of the previous
gelatin coarse powder having an average molecular weight of 1.000, none of which is not
suitable for practical grinding. Next, the point is that the seratin coarse powder belonging to the
small range of the average molecular weight is more efficiently crushed to a gelatin coarse
powder belonging to the large range of the average molecular weight, the seratin coarse powder
having different average molecular weights The average particle size of gelatin powder obtained
by grinding is also clarified, and the average molecular weight of the seratin coarse powder to be
ground is 8. from the viewpoint of setting this average particle size low under the same grinding
conditions. It is preferable that it is 500 or less. In a typical example of the average molecular
weight and the average particle size, when the average particle size of a gelatin powder obtained
by grinding a gelatin coarse powder having an average molecular weight of 1.000 is 100, seratin
coarse powder having an average molecular weight of 8.500 is used. The gelatin powder
obtained by grinding has an average particle size of 110 and a gelatin powder obtained by
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grinding a seratin coarse powder having an average molecular weight of 10.000 has an average
particle size of 135, and a crude saratin of average molecule jl 13.000 The average particle size
of the gelatin powder obtained by pulverizing the powder is 173, and the average particle size of
the gelatin powder obtained by pulverizing the gelatin coarse powder having an average
molecular weight of 8.500 or more is extremely high. Also, seratins having an average molecular
weight in the range of more than 8.500 can not be a subject of the present invention. By the way,
the particle diameter of the gelatin powder obtained by this grinding can make the thing of the
range of a large particle diameter, or the thing of the range of a small particle diameter by
changing grinding conditions and classification conditions.
Therefore, according to the purpose of use of the gelatin powder to be crushed, the average
particle size, the maximum particle size and the minimum particle size of the gelatin powder to
be crushed are determined in advance, and the condition to be the target size and the particle
diameter within the rangeセ ラ セ ラ 粗 も と も と. The above-mentioned average particle size is
the most typical and practical particle size, and is suitable for blending into paints, coating
liquids, etc., but it is a gelatin powder having an average particle size larger than these average
particle sizes. But there is no problem in practice. However, in the case of grinding of a gelatin
coarse powder having an average molecular weight in the range larger than 8.500, the grinding
amount per unit time is reduced when the grinding conditions are changed to reduce the average
particle size of the ground gelatin particles obtained. Further, it is not possible to use practically
for the purpose of obtaining gelatin powder of fine particle size. For example, when gelatin crude
powder having an average molecular weight of 10.000 is ground to approximately the same
extent as gelatin powder having an average particle diameter obtained by grinding a gelatin
coarse powder having an average molecular weight of 7.000, the average molecular weight 7,7
The yield of ground gelatin particles per unit time using the seratin coarse powder having an
average molecular weight of 10.000 is as low as 20, and the average molecular weight is 13.000,
as compared with the throughput per unit time of 1000 seratin coarse powder. The yield of
ground gelatin particles per unit time using a gelatin coarse powder is extremely low at 12 and
none of them are suitable for practical use. Next, the relationship between the average molecular
weight of the gelatin coarse powder to be ground and the amount of gelatin powder over 9 μm
contained in the ground gelatin powder is clarified. In one case where the gelatin crude powder
to be pulverized is pulverized and classified under the same conditions, the amount of 9 μm over
gelatin powder contained in the pulverized gelatin powder obtained by pulverization of this
gelatin crude powder has an average molecular weight of 1 0. 0% by weight of seratin coarse
powder of .000 and 1.9 wt% by crushing of seratin coarse powder with an average molecular
weight of 3.000 and 3.9 wt% by grinding of seratin coarse powder with an average molecular
weight of 7.000. While grinding of 500 seratin coarse powders shows a low value of 4.5 wt%, it
is 24.9 wt% of gelatinous coarse powders having an average molecular weight of 10.000, and
crude gelatin coarses having an average molecular weight of 13.000. It shows a high value of
33.0 wt% in the pulverization of powder. As a result, the gelatin powder obtained by grinding a
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gelatin coarse powder having an average molecular weight larger than 8.500 has a high
proportion of large diameter gelatin powder in the gelatin powder and is not suitable for
practical use. The characteristic gelatin powder 3 is eluted from the resin film 2 with water, hot
water or the like, and it is convenient to form the removal holes 4 of the gelatin powder 3 in the
resin skin @ 2.
Also, for elution of gelatin powder, an organic solvent having an average molecular weight
smaller than 80, more preferably methyl alcohol, ethyl alcohol, etc. having an average molecular
weight smaller than 60 is allowed to infiltrate the resin product, and then the resin product is
dissolved in water It is preferable to make elution of seratin powder more effective. [Effect] In the
speaker device according to the present invention, the whole or a part of the surface of at least a
part of the component parts is covered with the film 2 having the uniform and fine holes 4 and
the holes 2 in the film 2 The sound effects are particularly good, since they are uniformly
distributed.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an enlarged cross-sectional view of seratin powder 3 before removal, and FIG. 2 is an
enlarged cross-sectional view of seratin powder 3 after removal.
1 ... parts, 2 ... films, 3 ... seratin powder, 4 ... holes.
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