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JP2007324803

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007324803
A high-performance diaphragm can be manufactured at low cost, and by mounting the
diaphragm, a high-performance speaker device can be provided at low cost. A dome portion 41a
of an egg shell 41 of birds or the like is cut out, and the dome portion 41a of the cut out egg
shell 41 is mounted on the speaker device 10 as a dome-shaped diaphragm 11 or a reverse
dome-shaped diaphragm 11. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device on which a dome-shaped diaphragm or an
inverted dome-shaped diaphragm is mounted.
[0002]
The diaphragm mounted on the speaker device can be roughly classified into a cone type, a flat
(flat) type, a dome type and the like from the shape thereof.
And since the dome type has a wider radiation angle of sound and can form a stable sound field
at a wide angle compared with the cone type and the flat type, and is suitable for miniaturization,
it is suitable for on-vehicle audio equipment or It is widely used for portable devices.
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1
[0003]
Heretofore, various materials such as paper, resin, fiber, cloth material, and metal have been
developed as materials of such a diaphragm. However, regardless of which material is used, in
the manufacture of a conventional diaphragm, after forming into a predetermined shape (for
example, a cone shape or a dome shape) by molding processing using a mold, trimming is
performed to cut (cut out) unnecessary portions By carrying out the treatment, it is finished to a
predetermined shape and size (see, for example, Patent Document 1 and Patent Document 2).
[0004]
Patent Document 1: Japanese Patent Application Publication No. 2001-169387 Patent Document
2: Japanese Patent Application Publication No. 11-2285094
[0005]
By the way, for the diaphragm, select homogeneous and high-quality material at the material
stage before molding with a mold so that distortion or resonance does not occur locally during
operation so that distortion does not occur in the reproduced sound. In addition, advanced mold
forming technology that forms high quality materials with high precision so as not to cause local
variations in plate thickness is essential.
[0006]
However, recent diaphragm materials often use composite materials in which a plurality of
materials are mixed, such as dispersing reinforcing fibers in a resin to obtain better performance,
and generally, new diaphragms are generally used. In order to develop a homogeneous, highquality material to be used for the diaphragm, long-term development with many trials is
required, and the economic burden is also increased.
Moreover, in order to form the material with high precision, not only the high precision of the
mold for forming, but also the introduction of advanced forming technology that appropriately
manages the temperature and pressure at the time of forming is essential, and high precision A
great deal of cost is incurred in the manufacture of molds and in the molding facilities that
operate the molds with advanced molding techniques.
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[0007]
That is, in the conventional speaker device, the material development of the diaphragm and the
molding equipment require much cost, and there is a problem that the manufacturing cost of the
diaphragm increases the cost of the speaker device.
[0008]
As a problem to be solved by the present invention, an increase in the manufacturing cost of the
diaphragm, which occurs in the above-mentioned prior art, is mentioned as an example of a
problem that the cost of the speaker device is increased.
That is, the object of the present invention relates to solving the above problems, and a highperformance diaphragm can be manufactured inexpensively, and by mounting the diaphragm, a
high-performance speaker device can be provided inexpensively. is there.
[0009]
In order to solve the above problems, the speaker device according to claim 1 is characterized in
that the dome portion of the eggshell is cut out and the dome portion of the cut out eggshell is
mounted as a dome-shaped diaphragm or a reverse dome-shaped diaphragm. Do.
[0010]
Hereinafter, preferred embodiments of the speaker device according to the present invention will
be described.
The speaker device according to the embodiment of the present invention is characterized in that
the dome portion of the eggshell is cut out and the dome portion of the cut out eggshell is
mounted as a dome-shaped diaphragm or a reverse dome-shaped diaphragm.
[0011]
According to the above configuration, the diaphragm mounted on the speaker device as the
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3
dome-shaped diaphragm or the inverted dome-shaped diaphragm is obtained by cutting out the
dome portion of an eggshell such as a bird, and it is easy to cut a part of the eggshell. It can be
manufactured only with tools.
Furthermore, when using eggshells of chickens, for example, the remaining shells using the
contents of the eggs as food may be used, and in general, materials that are discarded can be
effectively used, and the material cost does not increase. And since the dome part cut out from
eggshell is a well-balanced dome shape from the beginning, it is not necessary to shape | mold
with a metal mold | die. Therefore, no molding equipment using expensive molds is required.
Therefore, it is possible to obtain a dome-shaped diaphragm or a reverse dome-shaped
diaphragm at low cost while omitting the development cost of the material and the
manufacturing cost due to the advanced molding technology. Also, for example, the components
of chicken eggshell are composed of 98% calcium carbonate, 1% magnesium carbonate, calcium
phosphate, other trace organic matter, and trace water, and naturally produced calcium
diaphragm It has various physical characteristics required for the diaphragm in a well-balanced
manner, and when used as a diaphragm, it exhibits even more excellent frequency characteristics
as compared to the existing titanium diaphragm. That is, by using the dome portion of the
eggshell as a dome-shaped diaphragm or a reverse dome-shaped diaphragm, a high-performance
diaphragm can be manufactured inexpensively, and by mounting the diaphragm, a highperformance speaker device Can be provided inexpensively.
[0012]
Preferably, in the above embodiment, the dome portion of the eggshell used as the dome-shaped
diaphragm or the inverted dome-shaped diaphragm has a surface or an inner surface with a
surface treatment for reinforcement or decoration. good. In this way, for example, if a thin film
made of resin is coated on the surface of the dome portion of the eggshell for reinforcement, the
disadvantage of the eggshell that is weak to impact can be improved. Furthermore, the thin film
made of resin used for surface treatment is combined with a suitable color or a pattern with a
plurality of colors, and at the same time, it also has a decorative property, and it is not limited to
the fabric color of eggshell, and it is decorative Product value can be enhanced by
[0013]
Furthermore, more preferably, in the above embodiment, the eggshells of the birds and the like
may be configured to be subjected to the surface treatment for reinforcement or decoration
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before cutting out the dome portion. With such a configuration, since the eggshell is less likely to
be broken by the surface treatment, it is possible to prevent the occurrence of careless breakage
when cutting out the necessary part, and to facilitate the production of the diaphragm. The
productivity of the diaphragm can be improved.
[0014]
Furthermore, specific examples of the speaker device according to the embodiment of the
present invention will be described in detail below with reference to the drawings.
[0015]
FIG. 1 is a longitudinal sectional view of a speaker device according to a first embodiment of the
present invention.
The speaker device 10 according to the first embodiment is a dome-shaped speaker device for
medium-high frequency reproduction, and includes a dome-shaped diaphragm 11 and a
magnetic circuit 13 for driving the dome-shaped diaphragm 11.
[0016]
The cylindrical voice coil bobbin 21 is joined to the outer peripheral portion of the dome-shaped
diaphragm 11, and the voice coil 22 is wound around the outer periphery of the voice coil
bobbin 21.
[0017]
The magnetic circuit 13 includes a magnetic core yoke 31 integrally formed in a bowl-shaped
structure including a disk-shaped bottom plate portion 31a and a cylindrical portion 31b
extending the outer periphery of the bottom plate portion 31a in the diaphragm axial direction.
The magnet 32 is formed in the shape of a disc in which both surfaces are magnetized and one of
the magnetized surfaces is in close contact with the bottom plate portion 31a so as to be
mounted in the pot yoke 31 and a magnetic material. The magnetic gap s is formed on the other
magnetized surface of the magnet 32 in the pot yoke 31 so as to be in intimate contact, and the
voice coil 22 is inserted between the outer peripheral portion and the cylindrical portion 31b.
And a plate 33.
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A ring-shaped frame 15 supporting the dome-shaped diaphragm 11 is fixed to the tip end surface
of the cylindrical portion 31 b of the pot yoke 31.
[0018]
The dome-shaped diaphragm 11 is supported by the frame 15 so as to be displaceable in the
axial direction of the diaphragm via a roll edge 17 bonded to the outer periphery thereof.
[0019]
In the case of the present embodiment, as shown in FIGS. 2 (a) and 2 (b), the dome-shaped
diaphragm 11 cuts out the dome portion 41a of the egg shell 41 such as birds with the broken
line L, and cuts out the dome portion 41a. It is used as a diaphragm.
That is, the voice coil bobbin 21 and the roll edge 17 are adhered to the outer periphery of the
cut-out dome portion 41 a, and the dome portion 41 a is assembled to the magnetic circuit 13.
[0020]
In the case of this embodiment, as shown in FIG. 2A, the eggshell 41 is subjected to a surface
treatment for applying (coating) a thin film 43 of resin or metal to the surface before cutting out
the dome portion 41a. Ru. This thin film 43 serves both for reinforcement and for decoration. For
reinforcement, a resin or metal having physical properties to improve the impact resistance of
the eggshell is selected, and in order to exhibit the function for decoration, the resin is colored
and patterned appropriately.
[0021]
As eggshells 41 such as birds that are easy to obtain, it is from chickens, but in the case of a
speaker device with a smaller diameter than that, quail eggshells can be used, and for large
diameter subwoofers, ostrich Eggshells can also be used. In any eggshell, since the portion to be
used as a diaphragm is a part of the eggshell, it is sufficient to procure only the shell of the egg
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after it has been used for food and the like.
[0022]
According to the first embodiment described above, the dome-shaped diaphragm 11 mounted on
the speaker device 10 is obtained by cutting out the dome portion 41 a of the egg shell 41 such
as birds, and a simple method of cutting a part of the egg shell 41 It can be manufactured only
with tools. Moreover, when using eggshell 41, for example, the eggshell 41 may be the remaining
shell that uses the contents of the egg for food, and usually the material being discarded can be
effectively used, and the material cost is not increased. . And since the dome part 41a cut out
from the eggshell 41 is a well-balanced dome shape from the beginning, it is not necessary to
shape | mold with a metal mold | die. Therefore, no molding equipment using expensive molds is
required. Therefore, it is possible to obtain the dome-shaped diaphragm 11 at low cost while
omitting the development cost of the material and the manufacturing cost due to the advanced
molding technology.
[0023]
Also, for example, the components of chicken egg shell 41 are composed of 98% calcium
carbonate, 1% magnesium carbonate, calcium phosphate, other trace organic matter, and trace
water, and naturally produced calcium vibration. It is a plate and has various physical
characteristics required for the diaphragm in a well-balanced manner. When used as a
diaphragm, it exhibits even more excellent frequency characteristics as compared to the existing
titanium diaphragm.
[0024]
FIG. 3A shows the frequency characteristics of the speaker device 10 in which the dome portion
41 a of the eggshell 41 of chicken is mounted as the dome-shaped diaphragm 11.
FIG. 3B shows the frequency characteristics when the existing titanium diaphragm of the same
diameter is mounted as the dome-shaped diaphragm 11 for comparison. (A) A comparison of the
falling part B1 on the low band side of the frequency characteristic line f1 of the eggshell
diaphragm with the low part falling part B2 on the frequency characteristic line f2 of the
titanium diaphragm shown in (b) The eggshell diaphragm using chicken eggshell 41 has smooth
characteristics in the middle region compared to the existing titanium diaphragm, as is apparent
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from comparison of the degree of depression in the high region of each characteristic line. A
wider band can be secured, and a stable output level can be maintained even at high frequencies,
and it has been confirmed that the diaphragm for the middle and high frequencies is highperformance.
[0025]
That is, by using the dome portion 41a of the egg shell 41 as the dome-shaped diaphragm 11, a
high-performance diaphragm can be manufactured inexpensively, and by mounting the
diaphragm, the high-performance speaker device 10 can be manufactured inexpensively. Can be
provided.
[0026]
Further, in the present embodiment, since the thin film 43 made of resin is coated on the surface
of the dome portion 41 a of the egg shell 41 for reinforcement, the disadvantage of the egg shell
41 that is weak against impact can be improved.
Furthermore, the thin film 43 of the present embodiment is not limited to the fabric color of the
eggshell 41, as it has decorativeness at the same time by appropriately coloring or adding a
pattern of a plurality of colorings. Can increase the commercial value.
[0027]
Further, in the present embodiment, the surface treatment for applying the reinforcement and
decoration thin film 43 is performed before the cutting out of the dome portion 41a, and the
eggshell 41 is less likely to be damaged by the surface treatment. When cutting out a portion, it
is possible to prevent the occurrence of careless breakage, to facilitate the manufacture of the
diaphragm, and to improve the productivity of the diaphragm.
[0028]
FIG. 4 is a longitudinal cross-sectional view of Example 2 of the speaker device according to the
embodiment of the present invention.
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The speaker device 20 according to the second embodiment includes an inverted dome-shaped
diaphragm 51, a magnetic circuit 52 for driving the inverted dome-shaped diaphragm 51, and a
frame 53 for supporting the inverted dome-shaped diaphragm 51 and the magnetic circuit 52.
And consists of
[0029]
As shown in FIG. 5, the inverted dome-shaped diaphragm 51 cuts out the dome portion 41b on
the side where the curved radius of the egg shell 41 is large at a breaking line L, and utilizes the
cut-out dome portion 41b as a diaphragm. Although not shown, the eggshell 41 has a thin film
43 made of resin for reinforcement and decoration on the surface before cutting out the dome
portion 41b as in the case of the first embodiment. Surface treatment which applies (coating)
(refer to (a)) is applied.
[0030]
The magnetic circuit 52 includes a yoke 54 having a structure in which a cylindrical center pole
54b protrudes from the center of a disk-shaped plate 54a, a ring magnet 55 loosely fitted on the
outer periphery of the center pole 54b, and a plate 54a. And a ring-shaped top plate 56 loosely
fitted on the tip end side of the center pole 54b so as to sandwich the magnet 55 between them.
A gap between the inner periphery of the top plate 56 and the center pole 54 b is a magnetic gap
s in which the voice coil 58 wound around the voice coil bobbin 61 is disposed.
[0031]
In the inverted dome type diaphragm 51 which is an eggshell diaphragm, an opening 51a
through which the voice coil bobbin 61 is inserted is formed at the center. The inner peripheral
edge of the inverted dome-shaped diaphragm 51 forming the opening 51a is airtightly fixed to
the outer periphery of the voice coil bobbin 61 inserted in the opening 51a by adhesion or the
like. Although not shown, the end opening of the voice coil bobbin 61 is sealed by a dust cap
adhered to the inner peripheral edge of the inverted dome-shaped diaphragm 51.
[0032]
In the roll edge 62 joined to the outer peripheral edge of the inverted dome-shaped diaphragm
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51, the mounting flange portion provided on the outer periphery of the roll edge 62 is adhered
and fixed to the edge support portion 53 a of the frame 53.
[0033]
The cylindrical voice coil bobbin 61 is loosely fitted on the outer periphery of the center pole
54b movably in the axial direction, and is elastically supported by the frame 53 via the damper
63 so as to restrict axial movement. .
[0034]
The damper 63 is formed in a bellows structure (corrugation structure) in which projections and
depressions are alternately arranged in the radial direction, and is called a corrugation damper.
The outer peripheral edge of the damper 63 is fixed to the damper support portion 53b of the
frame 53, and the inner peripheral edge is fixed to the outer periphery of the voice coil bobbin
61 to restrict the radial displacement of the voice coil bobbin 61. At the time of driving the mold
diaphragm 51, vibration energy is absorbed by deformation of the bellows, and vibration control
of the inverted dome-shaped diaphragm 51 is performed.
[0035]
A signal is input to the voice coil 58 through a tinsel wire connected to an input terminal on the
frame 53.
Then, the reciprocal dome-shaped diaphragm 51 is vibrated by the reciprocating vibration of the
voice coil bobbin 61 accompanying the input signal to the voice coil 58 to reproduce sound.
[0036]
Also in the case of the speaker device 20 according to the second embodiment described above,
the dome portion 41b of the egg shell 41 is used as the inverted dome type diaphragm 51, so
that a high-performance diaphragm can be manufactured inexpensively as in the first
embodiment. By mounting the diaphragm, a high-performance speaker device can be provided at
low cost.
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[0037]
FIG. 6 is a longitudinal cross-sectional view of a third example of the speaker device 65 according
to the embodiment of the present invention.
The speaker apparatus 65 of the third embodiment is an improvement of a part of the speaker
apparatus 10 shown in the first embodiment, in which the dome portion 41c of the eggshell 41
shown in FIG. 5 is mounted as a dome-shaped diaphragm 67, The other configuration is the same
as that of the first embodiment, and a common part number is assigned to the common
configuration and the description is omitted.
[0038]
Also in the case of the speaker device 65 according to the third embodiment described above, the
dome portion 41c of the egg shell 41 is used as the dome-shaped diaphragm 67 to manufacture
a high-performance diaphragm at low cost as in the first embodiment. By mounting the
diaphragm, a high-performance speaker device can be provided at low cost. Further, the dome
portion 41c cut out of the egg shell 41 has a deep depth, so that it can provide a dome shape of a
hem stop which is difficult or impossible to form by press molding or injection molding, and a
novel appearance not found in existing dome shaped diaphragms Can be provided.
[0039]
As described above, as described in detail in each of the above-described embodiments, the
speaker device 10 according to the embodiment of the present invention cuts out the dome
portion 41a of the eggshell 41 such as birds, and the dome portion 41a of the cutout eggshell 41
is dome-shaped. It is characterized in that it is mounted as the diaphragm 11 or the inverted
dome type diaphragm 11.
[0040]
Thus, the diaphragm mounted on the speaker device 10 as the dome-shaped diaphragm 11 or
the inverted dome-shaped diaphragm 11 is a cutout of the dome portion 41 a of the eggshell 41
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such as a bird, and a part of the eggshell 41 is cut. It can be manufactured with only simple tools.
Moreover, when using eggshell 41, for example, the eggshell 41 may be the remaining shell that
uses the contents of the egg for food, and usually the material being discarded can be effectively
used, and the material cost is not increased. . And since the dome part 41a cut out from the
eggshell 41 is a well-balanced dome shape from the beginning, it is not necessary to shape |
mold with a metal mold | die. Therefore, no molding equipment using expensive molds is
required. Therefore, it is possible to obtain the dome-shaped diaphragm or the inverted domeshaped diaphragm 11 at low cost while omitting the development cost of the material and the
manufacturing cost due to the advanced molding technology.
[0041]
Also, for example, the components of chicken egg shell 41 are composed of 98% calcium
carbonate, 1% magnesium carbonate, calcium phosphate, other trace organic matter, and trace
water, and naturally produced calcium vibration. It is a plate and has various physical
characteristics required for the diaphragm in a well-balanced manner. When used as a
diaphragm, it exhibits even more excellent frequency characteristics as compared to the existing
titanium diaphragm.
[0042]
That is, by using the dome portion 41a of the egg shell 41 as the dome-shaped diaphragm 11 or
the inverted dome-shaped diaphragm 11, it is possible to manufacture a high-performance
diaphragm at low cost, and by mounting the diaphragm The performance speaker device 10 can
be provided at low cost.
[0043]
It is a longitudinal cross-sectional view of Example 1 of the speaker apparatus based on
embodiment of this invention.
It is explanatory drawing of the manufacturing method of the dome-type diaphragm mounted in
the speaker apparatus shown in FIG.
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(A) is a frequency characteristic diagram of the speaker device of FIG. 1, (b) is a frequency
characteristic diagram when the diaphragm in the speaker device of FIG. 1 is changed to an
existing diaphragm made of titanium. It is a longitudinal cross-sectional view of Example 2 of the
speaker apparatus based on embodiment of this invention. It is explanatory drawing of the
manufacturing method of the dome-type diaphragm mounted in the speaker apparatus shown in
FIG. It is a longitudinal cross-sectional view of Example 3 of the speaker apparatus based on
embodiment of this invention.
Explanation of sign
[0044]
DESCRIPTION OF REFERENCE NUMERALS 10 speaker device 11 dome-shaped diaphragm 13
magnetic circuit 15 frame 17 roll edge 20 speaker device 21 voice coil bobbin 22 voice coil 31
point yoke 32 magnet 33 plate 41 eggshell 41 a dome portion 41 b dome portion 41 c dome
portion 43 thin film 51 reverse dome shape diaphragm 52 Magnetic circuit 53 Frame 54 Yoke
55 Magnet 56 Top plate 58 Voice coil 61 Voice coil bobbin 63 Damper 65 Speaker device 67
Domed diaphragm
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