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JPH01143497

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DESCRIPTION JPH01143497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker used in various kinds of audio equipment, and more particularly to a
cone-shaped diaphragm. The present invention relates to a diaphragm having a shell structure in
which a large number of shells of arbitrary shape are provided on the vibration surface. 2.
Description of the Related Art A diaphragm used in a speaker can be roughly divided into a cone
diaphragm, a dome diaphragm and a flat diaphragm. Among the diaphragms used in the past,
there has recently been used a plurality of planar diaphragms (in which a core material called a
honeycomb core formed in a honeycomb shape between two thin skins is bonded and fixed. On
the other hand, the cone-type diaphragms used for the largest number of loudspeakers have 9
various materials researched and developed for practical use as materials constituting the
diaphragms, but the shape is simply one The sheet material is merely molded into a so-called
conical shape using a mold or the like, and the cross section is solid. Therefore, in order to give
rigidity to the diaphragm itself, the cone-shaped diaphragm forms a corrugation or a spherical
bulging portion on the vibrating surface. [Problems to be Solved by the Invention] However,
according to the above-mentioned known means 1, for example, a diaphragm in which the
vibration surface is corrugated. Although it has strength against twisting, it is weak against radial
load (longitudinal direction), and when a spherical bulging part is formed on the vibrating
surface, the strength of the peripheral part where the bulging part is formed is assured. Although
it increases, it is hardly effective in increasing the rigidity of the whole diaphragm, and it has the
disadvantage that it is not clean in design. [Means for Solving the Problems] In view of the
current situation, the present invention provides a cone-shaped diaphragm in which the rigidity
of the entire diaphragm is increased instead of the rigidity of the diaphragm in part. The present
invention has been completed by conducting earnest research for the purpose. That is, according
to the present invention, a sheet-like material is formed into a cone shape, and a plurality of
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concavo-convex shells are provided on the conical surface to form a diaphragm material, and the
plurality of diaphragm materials are superposed and fixed. A diaphragm having a shell structure
characterized in that it is a diaphragm. The material used for the diaphragm of the present
invention is not particularly limited, but a thin sheet member such as scissors or a synthetic resin
film is preferable. To mold these sheet members into a cone shape. It is carried out by a
conventionally known means, and when forming a sheet material into a cone shape, a shell
consisting of asperities is simultaneously formed. The shape of the concavo-convex shell formed
in the pyramidal surface is two conical, pyramidal two spherical, etc., so the shape of the shell is
selected according to the application of the speaker.
The shell is integrally formed on a part or the whole surface of the conical surface, and the
arrangement thereof is randomly disposed toward the outer peripheral surface with reference to
the center of the cone, or involute or spiral. There is a method of arranging functions such as
crosslink, arc or hyperbola, but the arrangement is not particularly limited. Select as appropriate
according to the application of the speaker. [Operation] In the present invention, a single coneshaped vibration is obtained by overlapping two or more diaphragm materials obtained by
integrally molding a plurality of shells in a concavo-convex shape on a conical surface and fixing
them by means such as adhesion. Since the plate is configured, even a thin diaphragm material
can be made into a diaphragm having sufficient rigidity by superimposing it. [Embodiment] An
embodiment of a diaphragm having a shell structure of the present invention will be described in
detail with reference to the attached drawings. 1 is a partially cutaway sectional view showing an
example of a diaphragm having a shell structure according to the present invention, FIG. 2 is an
enlarged sectional view of FIG. 1A, and FIG. 3 is a main part showing another embodiment. It is
an expanded sectional view. In FIG. 1 and FIG. 2, the diaphragm 1 of this invention is comprised
from the diaphragm material 2.3 of 2 sheets. One diaphragm material 2 is formed by forming a
thin sheet member made of synthetic resin 2 into a cone shape, and at the same time, arranging a
truncated pyramidal shell 2a concentrically on the cone face centering on the center O of the
cone. It is integrally formed. The other diaphragm material 3 is formed into a cone shape using a
thin sheet member made of a synthetic resin made of the same material as the diaphragm
material 2 and, at the same time, a frustum pyramidal shell 3a is formed on its pyramid surface.
The diaphragm material 3 is integrally arranged concentrically around the center portion O of
the cone, but since this diaphragm material 3 is positioned inside as shown in the figure, the
diaphragm material 3 of the outer diaphragm material 2 is When the diameter is smaller than the
diameter and both vibration materials 2.3 are superposed and joined, the top of each of the
concavo-convex shells 2a formed on the diaphragm 2 and the top of the shell 3a formed on the
diaphragm material 3 So that they can be joined in consideration of the arrangement, size, etc. of
the shell 3a. Therefore, if diaphragm materials 2 and 3 are made. The diaphragm material 2 is
disposed concentrically with the diaphragm material 2 outside and the diaphragm material 3
inside, and the tops of the shells 2a and 3a formed on the diaphragm material 2.3 are adhered
with an adhesive. Construct one. FIG. 3 shows another embodiment of the present invention, in
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which an outer diaphragm material 4 and a middle diaphragm material 5 and an inner
diaphragm material 6 are used as a diaphragm of an inner and outer triple structure. The bottom
of the shell 4a of the plate material 4 and the bottom of the shell 5a of the middle diaphragm
material are joined and fixed, and then the top of the shell 5a of the diaphragm material 5 and
the top of the shell 6a of the inner diaphragm material 6 are One diaphragm 1 is formed by
overlapping and fixing.
The number of diaphragm materials used to form the diaphragm 1 may be four or more, and the
number is not particularly limited, and the material may also be paper, a single synthetic resin
material, or a plurality of materials. A synthetic resin material may be used. As described above,
according to the present invention, the sheet member is formed into a cone shape, and a plurality
of shells having a plurality of concavo-convex shapes are integrally formed on the conical surface
in an appropriate aspect to constitute the diaphragm material. Since these diaphragm materials
are stacked and fixed to form a single cone-shaped diaphragm, the overall rigidity of the coneshaped diaphragm can be greatly improved, and in particular, the rigidity against bending is
enhanced. Be done. In addition, mechanical compliance can be given by arbitrarily selecting the
shape and arrangement of shells integrally formed in the conical surface, and as well as having as
flat frequency characteristics as possible, a diaphragm with good directivity can be obtained. It
has a great effect on practical use.
[0002]
Brief description of the drawings
[0003]
1 is a partially cutaway sectional view showing an example of a diaphragm having a shell
structure according to the present invention, FIG. 2 is an enlarged sectional view of FIG. 1A, and
FIG. 3 is a main part showing another embodiment. It is an expanded sectional view.
1 ... diaphragm 2.3.4.5.6 ... diaphragm material 2a, 3a, 4a, 4a, 6a ... shell 0 ... diaphragm center
patent applicant Minebea Co., Ltd. Agent Patent Attorney Yuki 1) All 1 Figure 2 Figure 2
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