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JP2009177843

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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 JP2009177843
The present invention relates to a speaker diaphragm, a speaker, an electronic device, and a
device used in an audio device, and it is an object of the invention to make characteristics with
high accuracy and to make sound. According to the present invention, by forming a diaphragm
27 for a speaker by injection molding a material in which at least a resin material 27A and a pulp
material 27B are mixed, paper vibration with a large degree of freedom in setting physical
property values of the diaphragm is realized. It is possible to realize a diaphragm that can take
advantage of the advantages of the plate and the advantages of the resin diaphragm that can
ensure moisture resistance reliability and strength, have excellent appearance, and can also
improve productivity and dimensional stability. [Selected figure] Figure 1
Speaker diaphragm, speaker using the same, electronic apparatus and apparatus using the
speaker
[0001]
The present invention relates to a speaker diaphragm used for various audio devices and video
devices, and 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.
10-05-2019
1
FIG. 6 is a cross-sectional view of a conventional resin-made speaker diaphragm by injection
molding. As shown in FIG. 6, the speaker diaphragm 7 is obtained by thermally dissolving resin
pellets in a mold whose shape is set in advance 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 to the above, there has been a blend type using resins of
different types for the purpose of adjusting physical property values as a diaphragm, that is,
adjusting characteristics of a speaker and sound quality. 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.
[0005]
Japanese Patent Application Laid-Open No. 59-176995
[0006]
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.
[0007]
With regard to the sound quality, low distortion, wide band, high dynamic range and further
realism have been achieved, and with regard to images also, remarkable performance
improvement has been achieved by the high definition and the appearance and spread of large
modules such as plasma displays. .
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2
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.
[0008]
On the other hand, in the case of a speaker whose performance improvement is strongly
demanded by the market, it is indispensable to cope with the enhancement of the diaphragm
which occupies a large weight which determines the sound quality among the component parts
of the speaker.
[0009]
However, this diaphragm uses the manufacturing method by old-fashioned papermaking and the
manufacturing method by injection molding of resin and a press, and therefore, it was mainly a
paper diaphragm or a resin diaphragm.
For this reason, these diaphragms have been used properly according to their applications while
making use of their respective features, but each has problems and has not met the abovementioned market requirements.
[0010]
That is, in the case of the paper diaphragm, the physical property values of the diaphragm can be
set finely, and there is an advantage that the characteristics as a speaker and the freedom of
adjusting the sound quality increase, but it is inferior in moisture resistance and strength. It has a
drawback.
In addition, it has a disadvantage that it can not be obtained unless it requires a very large
number of steps of papermaking.
[0011]
On the other hand, with resin diaphragms, it is possible to ensure the moisture resistance
10-05-2019
3
reliability and strength, to be excellent in appearance, and to improve productivity, but because
only uniform physical property values peculiar to resin, which is the desirability of resin, can be
ensured. It has the disadvantage that the characteristics as a speaker and the adjustment range of
the sound quality become very narrow.
[0012]
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.
[0013]
That is, an object of the present invention is to provide an excellent speaker diaphragm in which
the good characteristics of paper and resin are compatible.
[0014]
In order to achieve the above object, the present invention constitutes a speaker diaphragm 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 diaphragm capable of making use of the features
of both the resin material and the pulp material.
[0015]
That is, a speaker diaphragm can be obtained which has a large degree of freedom in setting
physical property values of the diaphragm, can ensure moisture resistance reliability and
strength, can be excellent in appearance, and can also improve productivity.
[0016]
As described above, according to the present invention, since the speaker diaphragm is formed
by injection molding of a material in which at least a resin material and a pulp material are
mixed, the paper diaphragm having a large degree of freedom in setting physical property values
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4
of the diaphragm. It is possible to obtain a diaphragm which can take advantage of both the
advantages and advantages of the resin diaphragm which can ensure moisture resistance
reliability and strength, is excellent in appearance, and can improve productivity and dimensional
stability.
Therefore, it is possible to create a characteristic by making use of the physical properties of
both the paper diaphragm and the resin diaphragm, which can not be realized conventionally.
[0017]
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. Adjustment is possible.
[0018]
Furthermore, also in design such as color, a wide variety of designs are possible by the
combination.
And there is a possibility that the variation by the combination can be set infinitely, and it is
possible to satisfy the desired requirements in characteristics creation, sound creation and
design.
[0019]
Cross-sectional view of speaker diaphragm in one embodiment of the present invention Top view
of diaphragm for speaker in one embodiment of the present invention Cross-sectional view of
speaker in one embodiment of the present invention in one embodiment of the present invention
External view of electronic device Cross-sectional view of device according to one embodiment of
the present invention Cross-sectional view of a conventional speaker diaphragm
[0020]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0021]
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5
First Embodiment The first to thirteenth aspects of the present invention will be particularly
described with reference to the first embodiment.
[0022]
FIG. 1 shows a cross-sectional view of a diaphragm according to an embodiment of the present
invention, and FIG. 2 shows a plan view of a diaphragm according to an embodiment of the
present invention.
[0023]
As shown in FIGS. 1 and 2, the diaphragm 27 is formed by injection molding of a material in
which a resin material 27A and a pulp material 27B are mixed.
As a material of the diaphragm 27, a crystalline or amorphous olefin resin is used for the resin
material 27A.
[0024]
By using an olefin resin, the moldability can be improved, and by using crystalline and noncrystalline resin materials properly depending on the application, it is possible to satisfy the
optimum physical property value as a resin material. It becomes possible.
[0025]
In this case, among the above, the case of using polypropylene as the resin material 27A 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.
10-05-2019
6
[0026]
It is configured by mainly combining kraft pulp which is wood fiber as the pulp material 27B
with the polypropylene resin material as the base.
Here, natural and bright tones can be reproduced on wood fibers, and dark and uniform tones
unique to resins can be suppressed.
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.
[0027]
Furthermore, the pulp material 27B may be mixed with materials such as leaf fibers, bast fibers,
seed fibers, fruit fibers, stem fibers, and 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.
Here, leaf fibers tend to improve the strength of the diaphragm, and Manila hemp is often used.
In addition, bast fibers tend to improve the toughness and strength of the diaphragm, and
chopsticks, three-armed rabbits, gummy fish, hemp and the like are often used. Also, seed fibers
tend to improve the internal loss of the diaphragm, and cotton and linters are often used. Also for
fruit fiber, kapok is often used because it tends to improve the internal loss of the diaphragm. In
addition, stem fibers tend to improve the elastic modulus of the diaphragm, and materials such as
bamboo, rattan, kenaf, rattan are often used. 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 the
internal loss.
10-05-2019
7
[0028]
Furthermore, when it is desired to strengthen the diaphragm, 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, glass as reinforcement And ceramic fibers such as
boron, organic highly elastic fibers such as aramid, and mica or graphite may also be mixed.
[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]
Then, by combining the above-described materials, it is possible to freely adjust the physical
property value of the diaphragm with high precision, and it is possible to realize desired
characteristics and sound quality.
[0031]
The desired characteristics and sound quality require deep know-how regarding the creation of
physical properties and the creation of sound, but in general they are often implemented by the
means described below.
[0032]
The characteristics of the speaker and the sound generation can be changed to some extent by
varying the parameters of the component parts, and the desired characteristics and sound quality
can be approached.
For example, when parameters of other parts except the diaphragm are fixedly fixed among
components of the speaker, the variable parameters of the diaphragm include area, shape,
weight, surface thickness, etc. There is.
Therefore, assuming that the area, shape, weight, and surface thickness of the diaphragm are
10-05-2019
8
fixed at a fixed level on the assumption that this is a general stage of the speaker design, the
sound pressure frequency of the speaker is other than the physical property value of the
diaphragm. Characteristics and sound quality are roughly determined.
In this case, unnecessary peaks and dips occur on the sound pressure frequency characteristics,
and distortion often occurs in a specific frequency band.
[0033]
Further, with regard to the sound quality, the timbre is largely influenced by the sound pressure
frequency characteristic.
These causes are due to the area, shape, weight, and surface thickness of the diaphragm, and in
particular, most of them are due to the vibration mode of the diaphragm.
[0034]
When the present invention is applied as a means of selecting a diaphragm material for
improving the above-mentioned unnecessary peak dip and distortion and obtaining a good sound
quality, the following results are obtained. First, a material which is considered to be able to
satisfy the sound pressure frequency characteristics, the sound quality, and the reliability grade
required for the speaker is selected as a resin material, a pulp material and other mixed
materials. In this case, the resin material as the base is selected with particular emphasis on
reliability, such as its heat resistance grade, and a material whose inherent tone of each resin
material is close to a desired tone is selected. Then, materials are selected for unnecessary peaks
and dips on the sound pressure frequency characteristics to be deleted. In the case of the dip
countermeasure, a material having resonance at that frequency is selected, and in the case of the
peak countermeasure, a material having an internal loss at that frequency is selected. The
material selection is made for resin materials, pulp materials, and other mixed materials, taking
into consideration the material's specific density, elastic modulus, internal loss, timbre, and
resonance frequency when molded into a diaphragm shape.
[0035]
10-05-2019
9
The selected materials are then kneaded to produce masterbatch pellets of high pulp loading for
injection molding. Next, using this high-pulp masterbatch pellet, the diaphragm of the present
invention is obtained by injection molding.
[0036]
While measuring and evaluating the physical property values and the like of the diaphragm
obtained in this manner, a speaker is manufactured on a trial basis using this diaphragm, and the
characteristics and sound quality of the actual speaker are measured and auditioned, and the
final result is obtained. Conduct an evaluation.
[0037]
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 on their blending ratio and gradually
approach the target characteristics and sound quality.
[0038]
By repeating the process as described above, desired characteristics and sound quality can be
satisfied, or can be made very close.
[0039]
Moreover, the fiber length of the pulp material of this invention is comprised as 0.2 mm-20 mm.
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
10-05-2019
10
problems in productivity and quality such as losing the appearance.
[0040]
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.
[0041]
If you want to make the color of the diaphragm black based on the appearance design, use a
black pulp with the natural pulp material colored with black dye etc., knead the base resin from
natural color and so on, and black Obtain and produce resin-colored resin pellets. As another
method, there is also a method of mixing natural color pulp material and natural color resin
material, and mixing black pigment for coloring when producing master batch pellets with a high
filling amount of pulp. As described above, by setting the color of the diaphragm to a blackish
color, it is possible to enable a design that is not different from the conventional diaphragm.
[0042]
Although the above is a description of the most commonly used black-based color, it is not
limited to the black-based color, and the above method can be applied to all colors. Furthermore,
without using coloring agents such as these dyes and pigments, they can be used as natural
colors, and can be designed based on colors that are closer to nature and excellent in
environmental response.
[0043]
Further, as another design method, it is possible to design the pulp material and the resin
10-05-2019
11
material as different colors so as to show that both materials are mixed in one diaphragm. In this
case, it is particularly desirable to make the resin material transparent or translucent.
[0044]
As described above, according to the present invention, by forming a diaphragm for a speaker by
injection molding a material in which a resin material and a pulp material are mixed, the
advantage of a paper diaphragm having a large degree of freedom in setting physical property
values of the diaphragm is obtained. A diaphragm can be obtained which can secure the moisture
resistance reliability and strength, has an excellent appearance, and can take advantage of
features of both advantages of the resin diaphragm which can improve productivity and
dimensional stability.
[0045]
Therefore, it is possible to create a characteristic by making use of the physical properties of
both the paper diaphragm and the resin diaphragm, which can not be realized conventionally.
Furthermore, due to the color combination of the pulp material and the resin material, various
designs can be made.
[0046]
Second Embodiment The invention according to the fourteenth aspect of the present invention
will be described below with reference to a second embodiment.
[0047]
FIG. 3 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
As shown in FIG. 3, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
10-05-2019
12
[0048]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of any
one of the diaphragms 27 according to claims 1 to 13 is bonded to the peripheral edge portion of
the frame 26 via an edge 29. 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.
[0049]
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. Furthermore, the present invention can also be applied to
a small speaker for a mobile phone or the like in which the diaphragm 27 and the edge 29 are
integrated.
[0050]
With this configuration, as described in Embodiment 1, the degree of freedom in adjusting the
characteristics and sound quality is large, the moisture resistance reliability and strength can be
ensured, and a speaker with excellent appearance and high productivity can be realized. .
[0051]
Therefore, it is possible to make a sound with high accuracy by utilizing the physical properties
of both the paper diaphragm and the resin diaphragm which can not be realized conventionally.
Furthermore, also in design such as color, a wide variety of designs are possible by the
combination.
[0052]
And there is a possibility that the variation by the combination can be set infinitely, and it
becomes possible to realize a speaker which can satisfy desired requirements in characteristic
creation, sound creation and design.
10-05-2019
13
[0053]
Third Embodiment The third embodiment of the present invention will be used to explain the
invention set forth in claim 15 of the present invention.
[0054]
FIG. 4 is an external view of an audio mini-component system which is an electronic device
according to an embodiment of the present invention.
As shown in FIG. 4, the speaker 30 of the present invention is incorporated in the enclosure 41
to constitute a speaker system, and an amplifier 42 as amplification means for 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.
[0055]
With this configuration, it is possible to realize an electronic device capable of producing highaccuracy characteristics, making sound, and design that makes use of the features of both the
paper diaphragm and the resin diaphragm that can not be realized conventionally.
[0056]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0057]
FIG. 5 shows a cross-sectional view of an automobile 50 which is a device of an embodiment of
the present invention.
As shown in FIG. 5, the speaker 30 of the present invention is incorporated in a rear tray or a
front panel and used as a part of a car navigation system or a car audio system to construct an
automobile 50.
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14
[0058]
With this configuration, the characteristics of both the paper diaphragm and the resin diaphragm
of the speaker 30 can be used to create high-accuracy characteristics, make sound, and design,
such as a device such as an automobile equipped with the speaker 30. Acoustic design freedom
can be improved.
[0059]
The speaker diaphragm, the speaker, the electronic device, and the device according to the
present invention can be applied to an electronic device such as an audiovisual device and an
information communication device which needs high-quality characteristics and needs sound
creation, and further to a device such as an automobile.
[0060]
21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm
27A resin material 27B pulp material 28 voice coil 29 edge 30 speaker 41 enclosure 42
amplifier 43 player 44 mini component system 50 automobile
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15
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