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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm and a method of manufacturing the same, and more particularly to a
diaphragm having a sand-inch structure in which a skin material is bonded to the front and back
of a lightweight lightweight rigid core material. It is. The structure of the conventional example
and its problems In general, it is appropriate that the speaker diaphragm is light in light of the
material and has a large longitudinal elastic coefficient and a large internal loss, and the sound
pressure is flat in the light of the shape- It is appropriate to make the emitting surface flat to
obtain frequency characteristics. In recent years, in order to achieve the above object, a material
(aluminum alloy) having a large modulus of longitudinal elasticity on both the front and back
sides of a light and large-hard core material (mainly a honeycomb structure). What bonded the
skin material of carbon graphite, mica etc.) is adopted as a speaker diaphragm. The core material
of the honeycomb structure (hereinafter referred to as a honeycomb core) is manufactured by
the following method. First, as shown in FIG. 1, adhesive 2 is applied alternately at regular
intervals between thin sheets 1 as core material, and these are stacked and adhered. Next, the
bonded sheet is cut to a fixed width and stretched in the direction of lamination to form a core as
shown in FIG. By bonding a skin material to the front and back and processing it into a
predetermined shape, a speaker diaphragm is completed. The No-Nycomb core diaphragm made
in this manner is light and rigid or has large features, but has the following drawbacks. (1) It
takes many manufacturing steps, and the yield is low, so the cost is high. (2) From the structural
point of the core material 7 ・ The Nikam core has a directional rigidity so that the bending
rigidity is large in the X direction in Fig. 2 but small in the Y direction in Fig. 2 When it is used as
a diaphragm, the nodes become elliptical and hard to drive. (3) When the honeycomb core is
made of metal, a high peak is generated in the sound pressure-frequency characteristic in the
divided vibration region. (4) By making the cross-sectional shape of the diaphragm thin so that
the periphery is thin and the drive part is thick, the rigidity of the diaphragm is increased and the
resonance sharpness Q = has an effect to lower it. It is very difficult to process into a tapered
shape from the manufacturing method. On the other hand, recently, in place of the abovedescribed core, it has been proposed to use a plastic film as shown in FIG. In FIG. 3, 4 is a core
material, 4a and 4b are ridges of the core material, 3.3 'is a skin material, and 3a is a skin
material surrounded by one cell. The core material 4 has triangular peaks 4a and 4b radially
from the center, and the rigidity in the radial direction is large.
However, since the peaks 4a and 4b do not continue at the top of the mountain in the
circumferential direction, the rigidity is small, and as shown in FIG. 7-,-,. j Also, the skin material
is supported by the mountains 4a and 4b, but the area of the skin material 3a in the hatched
portion that is quadruple to them is thick, so this skin material 38 is a kind of vibrating film of
one kind of ball, If the resonance frequency is within the reproduction band of the speaker, it
resonates with the diaphragm, which has the disadvantage of causing unpleasant abnormal
sound. SUMMARY OF THE INVENTION The present invention provides a speaker diaphragm
having a sand-in structure and a method of manufacturing the same, which solves the problems
of the speaker diaphragm using the above-described nick core and the speaker diaphragm using
a plastic core material. . The present invention has a large number of frame-shaped projections
continuously arranged in the radial direction on one surface, and a linear projection arranged in
the radial direction on the bottom of each of the above-mentioned frame-shaped projections on
the other surface. A core material having a portion is formed of plastic, skin materials are
disposed on both front and back sides of the core material, and the skin material is adhered to
the frame-like protrusion and the straight protrusion. According to the configuration, the abovementioned conventional intermittent can be solved at once. Description of the embodiment Fig. 6
is a perspective view showing a part of a diaphragm in an embodiment of the present invention.
In FIG. 5, 6 is a core material, and 3, 3 'is a skin material adhered to both the front and back
sides. On the front side of the core member 5, a large number of concave portions usually called
cells 5a are provided. Each cell 5a is surrounded by a rectangular frame-like protrusion 5b, and
each frame-like protrusion 5b is continuously formed radially from the center of the diaphragm.
On the other hand, on the back side of the core member 5, a linear protrusion 6C is formed in a
straight line in the radial direction as a portion to be adhered to the bottom of each cell 5a. The
core material 5 of the present embodiment is manufactured as follows. First, a concave 6 having
a quadrangular protrusion 6a shown in FIG. 6 is prepared. Further, as shown in FIG. 7, in order to
form a portion to be bonded to the back surface skin material 3 ', a convex 7 having a linear and
linear plug 7aff from the center corresponding to the concave 6 is prepared. . FIG. 8a is a crosssectional view in the radial direction showing a state in which the concavo-convex molds 6 and 7
are centered on the upper and lower sides of the film 8. FIG. Then, when the film 8 is heated and
pressed, it is shaped as shown in FIG. 8 to obtain the core material 5 as shown in FIG. As
described above, according to the present embodiment, since the plastic film may be formed by a
press die, the number of steps can be reduced compared to the conventional diaphragm using a
honeycomb core.
In addition, since the cell pattern of the core material can be made radial, the node of the
vibration mode of the diaphragm becomes a circle and the node driving becomes easy. In
addition, since the ridges 6b are also provided in the circumferential direction by the frame-like
protrusion 6b, the rigidity is increased and the asymmetric vibration as shown in FIG. 4 is
strengthened. Also, the skin material of the diaphragm using the conventional plastic core is
supported by OA and OB shown in FIG. 9, but in this embodiment it can be made smaller than
that of the conventional hatched portion ABCD, so its resonance frequency becomes higher It has
the advantage of being able to drive the so-called cell noise that the skin material resonates out
of the regeneration zone. FIG. 10 is a perspective view showing a part of another embodiment of
the present invention. The core material 9 is obtained by gradually changing the radial thickness
of the core material 6 shown in FIG. This core material 9 can be obtained by performing the same
press molding as in FIGS. 8a and 8b by using a mold 10 in which the plug 10a is tapered as
shown in FIG. As described above, in addition to the features of the previous embodiment, the
present embodiment has a great feature that can easily obtain a tapered core material which is
difficult with a non-Nickam core. Furthermore, in the conventional magnetic core, there is a
problem that the drive part becomes elliptical due to the directionality of rigidity, but in the
present invention, if the cells are made to have a radial pattern, the nodes of the vibrating moat
become circular, as shown in FIG. Since the conical cone-shaped cone 11 can be used, processing
of the coupling cone becomes easy, and an inexpensive speaker unit can be manufactured. In the
sub-figure 12, 12 is an edge, 13 is a diaphragm, 14 is a frame, 15 is a damper, 16 is a bobbin, 17
is a voice coinope 18 is a plate, 19 is a magnet, and 20 is a yoke. Further, in the above two
embodiments, the shape of the cell is a quadrangle but may be another polygon or an oval, and
any shape may be applied as long as it is a frame shape. Effects of the Invention As described
above, according to the present invention, the radial rigidity can be increased by configuring the
cells surrounded by the frame-like protrusion radially and continuously from the center of the
drive plate, and asymmetric vibration can be obtained. There is no dip in the characteristics
because there is no In addition, since the cells of the core material become smaller, the resonance
of the skin material can be driven to a frequency higher than the reproduction band of the
speaker, and fatal defects such as chattering of the skin material can be eliminated during
reproduction. Also, in the manufacturing method, although more than a dozen steps are required
in the conventional method of manufacturing the new core, in the case of the present invention,
the cost can be significantly reduced if the plastic film is press-formed in three steps. It has the
In addition, since a material having a large internal loss can be used as the core material in
comparison with a metal, it is possible to suppress the peak in the divided vibration region small,
and it is possible to extend the usable band, and at the same time It can be reduced. Furthermore,
by changing the cross-sectional shape of one of the molds, it is possible to make the diaphragm
optimal as a diaphragm.
Brief description of the drawings
Fig. 1 is used for the conventional vibration rupture · · · Cross section to explain the
manufacturing method of the nick core-Fig. 2, Fig. 2 is a plan view of the honeycomb core, Fig. 3
shows the conventional chevron core material 4 is a diagram showing an asymmetric mode of
the diaphragm of FIG. 3, and FIG. 5 is a main part showing a first embodiment of the loudspeaker
diaphragm of the present invention. 6 is a perspective view showing a part of a concave mold for
molding the core material of the first embodiment, and FIG. 7 is a part of a convex mold for
molding the core material of the first embodiment. FIG. 8a and 8b are views showing the forming
process of the core material of the first embodiment, and FIG. 9 is a view comparing the size of
the cell of the present invention and the cell of the conventional example, 10 FIG. 11 is a
fragmentary cutaway perspective view showing a second embodiment of the present invention,
and FIG. 11 is a portion of a convex mold for molding the core material of the second
embodiment. Perspective view showing, Fig. 12 is a sectional view of a speaker Uni cement with
Subika diaphragm of the present invention.
1 ·································································· Skin material, 4, 5.9 ······ Core material, 4a, 4b · · · · · · · · · · · · · · ·
· · · · · · · · · · · .......... 10a · · · · · · · Plug · · · · · · · · · · · · · · · · · · · · · · · · · plastic film, 11 · · · · · Kanoffing
cone, 12 · · · · · · · · · · diaphragm · 14 · · · frame, 15 ... Damper, 16 ......... Bobbin, 17 ... Voice coil, 18
... Great, 19 ... Magnet ... 20 ...-Yoke. Name of agent Attorney Nakao Toshio And one other
person? Fig. 211 Fig. 4 Fig. 5 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12
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