JPH1127792

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DESCRIPTION JPH1127792
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm for a speaker, and more particularly to a method of
manufacturing a diaphragm having a substantially gull-like shape.
[0002]
2. Description of the Related Art There are various types of diaphragms for loudspeakers
depending on the purpose, application and the like. Therefore, it is easy to balance the vibration
even for a large electric input, to increase the electroacoustic conversion efficiency without
generating a lateral vibration of the vibration system, and to obtain broad directivity and flat
frequency characteristics. Recently, a diaphragm having a so-called gull-like shape as shown in
FIG. 8 has been provided.
[0003]
Heretofore, in the case of manufacturing a diaphragm of this type, a method has been adopted in
which a flat diaphragm base is pressed and formed into a semicircular shape using upper and
lower molds.
[0004]
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However, in the above method, first, there are many forming steps such as manufacturing the
base material, placing it in a mold, pressing it and cutting off the excess part, etc. is there.
Mold shape is complicated and expensive. Variations in shape occur with variations in press
conditions such as temperature and time, so that the shape is not stable and variations in quality
and characteristics occur. And other issues.
[0005]
The present invention has been proposed in view of the above, and an object of the present
invention is to provide a method of manufacturing a diaphragm which is easy to manufacture,
can reduce cost, and has little variation in shape and quality. .
[0006]
[Means for Solving the Problems] That is, according to the present invention, a diaphragm base 1
comprising a cylinder formed by an extrusion molding method using an extruder A is formed,
and a part of this is cut in the axial direction, Further, a diaphragm having two substantially
wedge-shaped curved surfaces 1b and 1b and having a substantially gull-shaped cross section,
which is bent with reference to the central portion 2, is manufactured to achieve the above
object.
Here, the shape formed by extrusion molding can be not only a true circle, but also an
appropriate shape that is found in the final shape of an elliptical shape etc. diaphragm.
[0007]
In the above, a part of the diaphragm base 1 is formed thick.
[0008]
Further, a flat plate material in the form of a film is rolled into a cylindrical shape through a roll
6 to form a cylindrical diaphragm base 1 and bent on the basis of the central portion 2 thereof to
form two substantially wedge-shaped curved surfaces 1b. , And 1b, and the above-mentioned
object is achieved.
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[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows a first
embodiment of the present invention.
In this embodiment, the diaphragm base 1 made of a cylindrical body is first manufactured using
an extrusion molding machine A, and a diaphragm having a predetermined shape is obtained
from the diaphragm base 1.
[0010]
That is, FIG. 2 shows the long diaphragm base 1 manufactured by the above-mentioned extrusion
molding method.
If the diaphragm substrate 1 is long, as shown in FIG. 3, it is cut into the required predetermined
length L.
[0011]
Therefore, since the diaphragm base material 1 from the extruder A is long, it is possible to easily
obtain one having a plurality of predetermined lengths by cutting it.
[0012]
As a material, a resin material such as polyamide, polyimide, or polyester which can be easily
molded and can obtain predetermined characteristics (Young's modulus, internal loss, etc.) as a
diaphragm is used.
Further, by mixing a coloring agent, a diaphragm of a desired color can be obtained. Moreover,
the cylindrical diaphragm base material 1 of desired thickness and a diameter can be easily
obtained by designing the cross section of extrusion suitably.
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[0013]
In order to make a diaphragm having a substantially gull-like shape from a cylindrical one, first,
as shown in FIG. 4, a part is cut along the axial direction. 3 shows the cutting part in the figure.
Next, as shown in FIG. 5, it is bent on the basis of the substantially central portion 2.
[0014]
That is, as shown in FIG. 6, in order to bend in a gull-like shape in this manner, a part is formed
on the first jig 4 having an almost circular outer shape and a recess 4a formed in part. As shown
in FIG. 7, when the second jig 5 for bending placed on the concave portion 4a is wound around
the cut diaphragm base 1 and the diaphragm base is curved in an arc shape. The material 1 can
be easily deformed like a gull.
[0015]
When the diaphragm base 1 is wound around the first jig 4, the central portion 2 is positioned on
the recess 4 a.
Further, the shape of the second jig 5 is a shape substantially corresponding to the recess 4 a,
and is a shape sufficient to bend the central portion 2.
[0016]
FIG. 8 shows a perspective view of a diaphragm 1A manufactured by the above-mentioned
manufacturing method. The diaphragm 1A has two wedge-shaped curved surfaces 1b. Further, a
part of both side portions is bent outward to facilitate attachment of the speaker to the frame,
and an attachment portion 1c is formed.
[0017]
FIGS. 9 and 10 show respective examples in which the outer side of the central portion is
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thickened with a width of, for example, 2 to 3 mm and reinforced. In the figure, 1 d is the
reinforcing portion.
[0018]
FIG. 11 is a view in which the opposing portions of the pair of reinforcing portions 1d are bonded
to increase the rigidity when bending into a gull shape.
[0019]
FIG. 12 shows an example in which the thickness near the central portion is increased.
1e is the thick part. Further, FIG. 13 shows an example in which the opposite side outside is the
thick portion 1e.
[0020]
Such a thick portion can be easily obtained by making the cavity into which the resin of the
extruder A is injected into a corresponding shape, and by partially thickening the portion in this
way, The reinforcing effect can be enhanced or a desired vibration mode can be obtained.
[0021]
[Second Embodiment] FIGS. 14 and 15 show a second embodiment of the present invention.
In this embodiment, as shown in FIG. 15, the roll 6 is slightly rounded to form a cylindrical plate
as shown in FIG. 14, and the plate 6 is processed into a gull-shaped diaphragm. It has a feature.
[0022]
That is, FIG. 16 shows the obtained diaphragm base 1 and, in the same manner as in the abovedescribed embodiment, a diaphragm having a gull shape is obtained by passing through the steps
shown in FIG. 6 to FIG. Can.
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[0023]
In this embodiment, since an extruder is not used, the material of the diaphragm substrate 1 may
be, for example, paper other than resin, or a metal such as aluminum or titanium.
Of course, it may be a resin film of polyester, polyimide, PPTA or the like, and basically it may be
anything as long as it is a diaphragm material, and it may be set according to the purpose and
use of the speaker.
[0024]
FIG. 17 shows a cross-sectional view of an example of a speaker to which the above-described
approximately gull-shaped diaphragm 1A is applied. In the figure, reference numeral 10 denotes
a magnetic circuit comprising a yoke 11, a magnet 12, a plate 13 and the like. また、14はフレ
ームである。 Reference numeral 15 is a cylindrical voice coil provided in the magnetic gap
between the center pole 11a and the inner circumferential surface of the plate 13. One end of a
damper 16 is coupled to the outer periphery of this voice coil. The ends are joined on the outer
circumference of the frame 14. A central bending portion of a gull-shaped diaphragm 1A is
supported and coupled to a central portion on the voice coil 15, and an outer attaching portion
1c is coupled to the frame 14.
[0025]
In this diaphragm, the central portion of the diaphragm 1A having the two wedge-shaped curved
portions 1b and 1b is coupled to the center of the voice coil 15, and the attachment portions 1c
at both outer ends are coupled to the frame 14. It has various merits such as easy balance of
vibration with respect to a large electric input and no occurrence of lateral vibration of the
vibration system.
[0026]
As described above, according to the present invention, the cylindrical body obtained by the
extrusion molding method is cut and bent, or the flat plate material is rolled and bent to form a
gull shape. Thus, the manufacturing is easy, the cost increase can be suppressed, and the
variation in the shape is small, and the quality is stabilized.
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[0027]
Brief description of the drawings
[0028]
1 is a first embodiment of the present invention, is an explanatory view showing how to
manufacture a cylindrical diaphragm base using an extrusion molding machine.
[0029]
2 is a perspective view of a cylindrical diaphragm substrate having a long length.
[0030]
3 is a perspective view of a diaphragm substrate cut into a predetermined length.
[0031]
4 is a perspective view of a diaphragm substrate, a part of which is cut in the axial direction.
[0032]
5 is a perspective view showing a state in which the diaphragm base material partially cut is bent
into a gull shape.
[0033]
6 is a process diagram for forming a gull-shaped diaphragm base material partially bent using a
jig.
[0034]
7 is a manufacturing process diagram showing a state of becoming a gull shape.
[0035]
8 is a perspective view of a diaphragm having a gull shape.
[0036]
Fig. 9 An example in which a reinforcing portion is formed by partially thickening.
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[0037]
10 Another example in which a reinforcing portion is formed by partially thickening.
[0038]
Explanatory drawing at the time of making what has the reinforcement part of FIG. 11 thickness
into a gull shape.
[0039]
Fig. 12 An example in which a part is thickened.
[0040]
Fig. 13 Another example in which a part is thickened.
[0041]
14 is a perspective view of a flat plate material in the second embodiment of the present
invention.
[0042]
15 is a manufacturing process diagram of the second embodiment of the present invention.
[0043]
16 is a perspective view of a diaphragm substrate in the second embodiment of the present
invention.
[0044]
17 shows a configuration example of a speaker to which the diaphragm of the present invention
is applied.
[0045]
Explanation of sign
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[0046]
A Extruder 1 Diaphragm base 1A Diaphragm 1b Curved curved surface 1c Mounting part 1d
Reinforcement part 1e Thick part 2 Central part 3 Cutting part 4 Jig 4a Recess 5 Jig 6 Roll 10
Magnetic circuit 11 Yoke 11a Center Pole 12 Magnet 13 Top plate 14 Frame 15 Voice coil 16
Damper
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