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JP2005252775

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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
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DESCRIPTION JP2005252775
The present invention relates to a dust cap for a speaker, a speaker, an electronic device, and a
device used for an audio device, and it is an object to improve sound quality and adhesion.
According to the present invention, by forming a dust cap for a speaker by injection molding of a
material in which at least a resin material and a pulp material are mixed, the improvement of
sound quality and the freedom of setting physical property values are large, and the adhesion is
improved. A configuration that can realize a dust cap that can take advantage of both the
advantages of good paper and the advantages of a resin that can ensure moisture resistance
reliability and strength, has an excellent appearance, and can improve productivity and
dimensional stability. The [Selected figure] Figure 1
Loudspeaker dust cap, speaker using the same, and electronic apparatus and apparatus using the
speaker
[0001]
The present invention relates to a speaker dust cap for use in various audio devices and video
devices, and to electronic devices and devices such as speakers, stereo sets, and television sets
using the same.
[0002]
The prior art will be described with reference to FIG.
11-05-2019
1
FIG. 5 is a cross-sectional view of a conventional injection molded resin speaker dust cap. As
shown in FIG. 5, the speaker dust cap 9 is obtained by thermally dissolving resin pellets in a mold
previously set to a dust cap shape using a resin such as polypropylene, and injection molding.
[0003]
As a kind of resin material by these injection molding, single materials, such as a polypropylene,
are generally used well. In addition, for the purpose of adjusting the physical property value as a
dust cap, that is, adjusting the characteristics and sound quality as a speaker, a blend type dust
cap using different types of resins has been also present. Furthermore, with regard to adjustment
of physical property values that are difficult to adjust with these resins, reinforcing materials
such as mica were mixed to perform adjustment of physical property values, and adjustment of
characteristics as a speaker and sound quality.
[0004]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. JP-A-3-289298
[0005]
With respect to recent audio devices, video devices, and devices such as automobiles equipped
with these devices, performance has been dramatically improved in comparison with
conventional devices due to remarkable advances in digital technology.
[0006]
With regard to the sound quality, low distortion, wide band, high dynamic range and further
realism have been achieved, and remarkable performance improvement has been achieved with
high reliability.
Therefore, with the above-mentioned performance improvement of the electronic device, the
performance improvement of the speakers used for these electronic devices is strongly
demanded from the market.
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2
[0007]
On the other hand, with regard to the loudspeakers whose performance improvement is strongly
demanded by the market, it is indispensable to cope with the high performance of the dust cap
which occupies a large weight which determines the sound quality among the component parts
of the loudspeakers.
[0008]
However, this dust cap has been produced using a traditional pulp papermaking method, a resin
injection molding method, a press manufacturing method, or a cloth or metal press
manufacturing method.
For this reason, these dust caps have been used properly according to their applications while
making full use of their respective features, but each has its own drawbacks and it is possible to
meet the market requirements for the purpose of the above-mentioned performance
improvement. It was not.
[0009]
That is, in paper, although the physical property value can be set finely, the characteristics as a
speaker, the freedom of adjustment of sound quality is large, the internal loss is large, and there
is an advantage that flattening of frequency characteristics can be achieved. It has the
disadvantage of poor reliability and strength. In addition, it has a disadvantage that it can not be
obtained unless it requires a very large number of steps of papermaking.
[0010]
On the other hand, resin makes it possible to secure moisture resistance, water resistance and
strength, and to make the appearance excellent and to improve productivity, but only uniform
physical property values peculiar to resin, which is the desirability of resin, can be ensured. , The
characteristics as a speaker, and the adjustment range of the sound quality are very narrow.
[0011]
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3
The present invention solves the above-mentioned problems, has a large degree of freedom in
adjusting the characteristics and sound quality as a speaker, can ensure moisture resistance
reliability and strength, can be excellent in appearance and can improve productivity as well. It is
intended to be provided.
[0012]
That is, an object of the present invention is to provide an excellent speaker dust cap which
combines the good characteristics of paper and resin.
[0013]
In order to achieve the above object, the present invention constitutes a dust cap for a speaker by
injection molding a material in which at least a resin material and a pulp material are mixed.
With this configuration, it is possible to obtain a dust cap that can make use of the characteristics
of both the resin material and the pulp material.
[0014]
That is, it is possible to flatten the frequency characteristics with a large internal loss, to have a
high degree of freedom in setting physical property values of the diaphragm, to ensure moisture
resistance reliability and strength, to be excellent in appearance, and to improve productivity and
adhesion. The speaker dust cap can be obtained.
[0015]
As described above, according to the present invention, a dust cap for a speaker is configured by
injection molding of a material in which at least a resin material and a pulp material are mixed.
This configuration makes it possible to flatten the frequency characteristics with a large internal
loss, achieve the advantages of a paper diaphragm with a large degree of freedom in setting the
physical property values of the dust cap, and secure moisture resistance, water resistance
reliability and strength, and have excellent appearance. It is possible to obtain a dust cap that can
take advantage of the features of both of the advantages of the resin that can improve the
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4
properties and dimensional stability.
Therefore, it is possible to create sound by making use of the physical properties of both pulp, ie,
paper and resin, which could not be realized conventionally.
[0016]
Also, by selecting the pulp material, the resin material, and the reinforcing material that is the
mixing material from among a wide variety of materials, and setting the blending ratio
appropriately, the precision that has hitherto been impossible is high. Physical property values
can be adjusted.
[0017]
Furthermore, also in design such as color, a wide variety of designs are possible by the
combination.
Also, a large number of settings can be made for variations according to the combination, and
desired requirements can be satisfied in characteristic creation, sound creation, and design.
[0018]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0019]
First Embodiment The invention according to the first to eleventh aspects of the present
invention will be described below with reference to the first embodiment.
[0020]
FIG. 1 is a cross-sectional view of a dust cap according to an embodiment of the present
invention.
[0021]
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5
As shown in FIG. 1, the dust cap 29 is formed by injection molding of a material in which a resin
material 29A and a pulp material 29B are mixed.
As the material of the dust cap 29, a crystalline or non-crystalline olefin resin is used for the
resin material 29A.
[0022]
By using an olefin resin, moldability can be improved, and by using crystalline and noncrystalline resin materials properly according to their applications, it is possible to satisfy
optimum physical property values and properties as resin materials. It becomes possible.
[0023]
In this case, the case where polypropylene is used as the resin material 29A will be described.
Although polypropylene is generally easily available and injection molding is also easy, the
present invention is not limited to the resin material of the present invention and can be used
properly depending on its desired characteristic value.
For example, when high heat resistance and high solvent resistance are required, engineering
plastics suitable for the application can also be used.
[0024]
It is configured by mainly combining kraft pulp which is wood fiber as the pulp material 29B
with the polypropylene resin material as the base.
Here, wood fibers can reproduce natural and bright tones, and can suppress dark and uniform
tones unique to resins.
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Further, in addition to kraft pulp, sulfite pulp or a mixed fiber of kraft pulp and sulfite pulp is
mainly combined and configured by making use of the respective features, it is possible to
further approximate desired characteristics and sound quality.
[0025]
Furthermore, it is preferable to use any one or a combination of leaf fibers, bast fibers, seed
fibers, fruit fibers, and stem fibers as the pulp material 29B. Furthermore, the pulp material 29B
may be mixed with materials such as animal fibers. By mixing these materials, it is possible to
more closely approach the desired characteristics and sound quality or to adjust the
characteristics arbitrarily.
[0026]
Here, leaf fibers tend to improve the strength of the dust cap 29, and Manila hemp is often used.
In addition, bast fibers tend to improve the toughness and strength of the dust cap 29, and ax,
mochi, gimpa, hemp or the like are often used. Also, seed fiber tends to improve the internal loss
of the dust cap 29, and cotton and linters are often used. In addition, with regard to fruit fiber,
kapok is often used because it tends to improve the internal loss of the dust cap 29. In addition,
stem fibers tend to improve the elastic modulus of the dust cap 29, and materials such as
bamboo, rattan, kenaf, rattan are often used.
[0027]
In addition, for the purpose of fine adjustment of sound quality which can not be obtained with
the above-mentioned vegetable fiber, materials such as silk and wool which are animal fibers can
be mixed to finely adjust the strength and internal loss.
[0028]
Furthermore, if it is desired to strengthen the dust cap 29, add some accent to the sound, or
adjust the sound pressure frequency characteristics to adjust the sound quality, metal fibers such
as aluminum, carbon fibers such as carbon, etc. are used as reinforcements. Glass, ceramic fibers
such as boron, organic highly elastic fibers such as aramid, mica, graphite and the like may be
mixed.
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[0029]
In addition, when it is desired to secure sound quality provided with an internal loss that can not
be satisfied with the above-mentioned materials, materials such as zinc oxide whiskers can be
mixed and configured.
[0030]
And, by combining at least two or more of the above-mentioned materials, that is, wood fiber, leaf
fiber, bast fiber, seed fiber, fruit fiber, stem fiber, the physical property value of the dust cap 29
can be freely and precisely. It can be adjusted, and it becomes possible to realize desired
characteristics and sound quality.
[0031]
In addition to measuring and evaluating the physical property values of the dust cap obtained in
this manner, a speaker is manufactured on a trial basis using this dust cap, and the
characteristics as an actual speaker, and measurement and viewing of sound make the final
Conduct an evaluation.
[0032]
According to the above evaluation, if the desired characteristics and sound quality can not be
satisfied, this trial production process is repeated many times.
In addition to the selection of materials, we will improve their blending ratio and gradually
approach the target sound quality.
[0033]
By repeating the process as described above, desired characteristics and sound quality can be
satisfied, or can be made very close.
[0034]
Moreover, the fiber length of the pulp material of this invention is comprised as 0.2 mm-20 mm.
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8
By this configuration, it is possible to efficiently draw out the effect of kneading with the resin
material, and to improve the productivity and the quality.
Here, when the fiber length of the pulp material is shorter than 0.2 mm, the effect of the pulp
material can not be efficiently obtained.
On the other hand, if it is longer than 20 mm, poor dispersibility is likely to occur due to
secondary aggregation resulting from intertwining of fibers, so that a long kneading process with
the resin material is required, or pulp fibers fly to the surface of the diaphragm. It causes
problems in productivity and quality such as losing the appearance.
[0035]
Furthermore, the mixing ratio of the pulp material to the resin material of the present invention
is set to 5% to 70%.
By this configuration, it is possible to efficiently draw out the effect of kneading with the resin
material, and to improve the productivity and the quality.
Here, when the mixing ratio of the pulp material is less than 5%, the effect of the pulp material
hardly appears. On the other hand, when it is more than 70%, the defects of the pulp start to
appear, and the strength of the diaphragm, the productivity and the moisture resistance
reliability, and the dimensional stability are reduced.
[0036]
As described above, as a general effect, the dust cap 29 that receives the amplitude from the
normal vibration plate 27 and is vibrating generates unnecessary peaks and dips generated by
the divided resonance by the effect of the pulp having a large internal loss. It can be reduced.
[0037]
And about resin with bad adhesiveness, adhesiveness can be improved by the effect of a pulp.
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9
[0038]
Moreover, it is also possible to set it as the design which can appeal that both materials are
mixed in the dust cap 29 of 1 sheet by making resin material 29A and pulp material 29B into a
different color as one method of appearance design.
In this case, it is particularly desirable to make the resin material transparent or translucent.
[0039]
As described above, according to the present invention, by mixing the resin material 29A and the
pulp material 29B by injection molding to form the dust cap 29 for the speaker, unnecessary
peaks and dips caused by split resonance can be caused by internal loss. It can be reduced by the
effect of large pulp.
[0040]
In addition, a resin with which the freedom of setting the physical property values of the dust cap
29 is large and the advantage of paper with excellent adhesion, moisture resistance, water
resistance reliability and strength can be ensured, the appearance is excellent, and productivity
and dimensional stability can be improved. It is possible to obtain a dust cap that can take
advantage of both features of.
[0041]
Therefore, it is possible to create characteristics by utilizing the physical properties of both paper
and resin, which could not be realized conventionally, and to make sound.
[0042]
Furthermore, due to the color combination of the pulp material and the resin material, various
designs can be made.
[0043]
Second Embodiment The invention according to the twelfth aspect of the present invention will
be described below with reference to a second embodiment.
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10
[0044]
FIG. 2 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
As shown in FIG. 2, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
[0045]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
The outer periphery of the diaphragm 27 is bonded to the peripheral portion of the frame 26.
Then, one end of the voice coil 28 is coupled to the central portion of the diaphragm 27, and the
other end is coupled to be fitted into the magnetic gap 25 of the magnetic circuit 24.
[0046]
The dust cap 29 according to any one of claims 1 to 11 is adhered to the side opposite to the
voice coil 28 at the center of the diaphragm 27.
[0047]
Although the above has described the speaker having the internal magnet type magnetic circuit
24, the present invention is not limited to this, and may be applied to a speaker having the
external magnet type magnetic circuit.
[0048]
With this configuration, as described in the first embodiment, the unnecessary peaks and dips
generated by the split resonance can be reduced by the dust cap 29 by the effect of the pulp
having a large internal loss.
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11
[0049]
In addition, the degree of freedom in adjusting the characteristics and sound quality is large, the
moisture resistance and reliability can be ensured, and a speaker with an excellent appearance
and high productivity can be realized.
[0050]
Therefore, by using the dust cap 29 utilizing the physical properties of both paper and resin,
which can not be realized conventionally, it is possible to improve the sound quality, to make the
characteristics with high accuracy, and to make the sound.
Furthermore, also in design such as color, a wide variety of designs are possible by the
combination.
[0051]
Then, it is possible to set a large number of variations according to the combination, and it is
possible to realize a speaker capable of satisfying desired requirements in characteristic creation,
sound creation, and design.
[0052]
Here, the above-described dust cap 29 has a greater effect on the weight, which determines the
characteristics and sound quality in the speaker component, as the area, volume, and weight
thereof increase.
[0053]
Further, with respect to a dust cap having a size in which the external dimension of the dust cap
29 is close to the external dimension of the diaphragm 27 due to the structure disposed and
adhered to the front surface portion of the diaphragm 27, The weight that determines the
characteristics and sound quality may be large.
[0054]
This is a structure which is often found in a super woofer or the like which physically cuts highfrequency components and middle-high frequency components generated from a diaphragm,
11-05-2019
12
particularly by a dust cap.
[0055]
The cause of this is that although the dust cap vibrates and generates sound due to the amplitude
generated from the diaphragm, the sound that reaches the human ear directly is more generated
from the dust cap rather than the diaphragm. It is because of.
[0056]
Therefore, the characteristics and sound quality of the dust cap are greatly influenced by the
material and physical property value of the dust cap.
[0057]
In this case, the weight for determining the characteristics and sound quality of the speaker
components is the highest for the dust cap.
[0058]
Third Embodiment The third embodiment of the present invention will be described below in
detail.
[0059]
FIG. 3 is an external view of an audio mini-component system which is an electronic device
according to an embodiment of the present invention.
[0060]
As shown in FIG. 3, the speaker 30 of the present invention is incorporated in the enclosure 41
to constitute a speaker system, and an amplifier 42 which is a means for amplifying an electric
signal input to the speaker and a source input to the amplifier 42 And an audio mini-component
system 44, which is an electronic device.
[0061]
With this configuration, the dust cap that utilizes the characteristics of both paper and resin,
which could not be realized conventionally, realizes the improvement of sound quality and the
creation of high-precision characteristics, and the creation of electronic equipment that enables
sound creation and design. be able to.
11-05-2019
13
[0062]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0063]
FIG. 4 shows a cross-sectional view of an automobile 50 which is a device of an embodiment of
the present invention.
[0064]
As shown in FIG. 4, the speaker 30 of the present invention is incorporated in a rear tray or a
front panel, and is used as a part of a car navigation system or a car audio system to constitute
an automobile 50.
[0065]
With this configuration, the dust cap that utilizes the characteristics of both the paper and the
resin of the speaker 30 improves the sound quality and makes the characteristics with high
accuracy, makes the sound, designs the car, and the automobile equipped with the speaker 30
Etc. acoustic design freedom of the device can be improved.
[0066]
The dust cap for a speaker, the speaker, the electronic device and the device according to the
present invention are an electronic device such as an audiovisual device, an information
communication device, etc. requiring improvement of sound quality and characteristics with high
accuracy, and devices such as automobiles. Applicable to
[0067]
Cross-sectional view of a speaker dust cap according to an embodiment of the present invention
Cross-sectional view of a speaker according to an embodiment of the present invention External
view of an electronic device according to an embodiment of the present invention A device
according to an embodiment of the present invention Cross section view Cross section view of
conventional dust cap
Explanation of sign
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14
[0068]
21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm
28 voice coil 29 dust cap 29A resin material 29B pulp material 30 speaker 41 enclosure 42
amplifier 43 player 44 mini component system 50 automobile
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