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JPS5883499

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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 JPS5883499
[0001]
In the present invention, a shell in which a component having a rim provided on the periphery
thereof and a conical or cylindrical drive transmission body are integrated is used as an
aggregate, and a plate material having a surface material and a core material joined thereto is
joined. The present invention relates to a disc-type diaphragm with a drive transmission body. In
the case of a disk-shaped diaphragm, as a treatment for thickening its resonance frequency, (a)
increasing its plate thickness to increase its bending rigidity (for this purpose, a lightweight body
is used to suppress weight increase) As a core material, a sandwich structure in which a surface
material is attached to both sides is used) (b) Nodal driving of an appropriate order in a disc is
performed, (c) above (a), f opening Depending on the purpose, the method such as combining 1 is
used properly. An example of use of the above (iii) is shown below. FIG. 1 is a schematic crosssectional view showing a sandwich structure in which a surface material 2-1.2-2 is bonded to the
surface of a lightweight core material 1 with an adhesive, and FIG. The b + shows the same figure
(the detail of A part of al respectively. In the diaphragm, the core material is a honeycomb
material. A foam, a three-dimensional mesh metal, etc., and an aluminum alloy foil, a fiber
reinforced plastic sheet, etc. are used as the surface material. FIG. 2 shows the situation where
the drive cone 4 is joined with the adhesive 5 to the above-mentioned plate of the sand inch
structure. The same figure (112) is a general view, and the same figure fb) is a detail view of the
B part. The outer edge 'of the drive cone 4 selects a nodal circle diameter of an appropriate order
from among the nodal circles produced when the disc is shaken. Generally, in consideration of
the configuration and manufacturing problems, the No. 1-diameter circle diameter (number of
joint circles = 19 joint circle diameter = outside diameter X O, 6 B) is selected. According to the
above-described structure, the transmission of the force from the drive cone 4 to the surface
material 2-1 serving as the sound wave emitting surface in FIG. 2 is as follows. That is, first, from
the drive cone 4, the adhesive 5 for bonding the drive cone 4 to the back surface 2-2, the back
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surface 2-2, the back surface 2 Through the adhesive 3-2 for joining the core 2 and the core 1,
the core 1, and the adhesive 3-1 for joining the core 1 and the surface material 2-1 on the sound
wave emitting surface side, It reaches the surface material 2-1 on the sound wave emitting
surface side. However, the inclusions of the force transmission path show viscoelastic behavior
except for the surface material, and the transmission loss is large. In addition, since an adhesive
is used everywhere, it is necessary to use an appropriate jig for fixing the individual pieces to one
another, or it takes a long time for the adhesive to solidify or cure, which is an obstacle in
manufacturing Furthermore, the use of an adhesive has disadvantages such as producing a factor
that promotes weight increase at the same time as bonding.
It is an object of the present invention to provide a high rigidity structure and a low rigidity
transmission loss which do not have the disadvantages of the prior art described above. In order
to achieve the above object, in the present invention, a diaphragm is configured as follows. That
is, in order to simplify the force transmission path, a conical or cylindrical drive transmission
body and a part of the back plate opposite to the surface of the strip sound wave which forms a
part of the sandwich structure are integrated. On top of that, upright rims are provided on the
circumferential portion of the back plate to strengthen the back plate, and at the same time,
mounting and joining of the face plate to which the core material is joined is facilitated. . Further,
comparing the configuration shown in FIG. 3 with the configuration shown in FIG. 4, in the
configuration of FIG. 4, the opening portion of the drive cone is provided with an auxiliary back
plate for reinforcing the surface plate. . For practical use, the structure shown in FIG. 3 may be
used, and FIG. 4 is a modification of the grooved body shown in FIG. Next, an embodiment of the
present invention in which the drive transmission body is a conical body will be described. FIG. 3
shows the basic configuration of the diaphragm according to the present invention, and FIG. 3 (a)
shows the whole, FIG. 3 (b) shows the details of the portion C of FIG. C) also shows the details of
D part respectively. First, a kind of metal foil such as aluminum or aluminum alloy, titanium, etc.
is selected, and a portion of the back plate and the drive cone are integrally made, and a rim
erected further on the circumferential portion of the back plate The outer shell 7 is provided, and
a face plate made by the method described later separately is attached and joined to the inner
side of the outer shell 7 to form a disc of a partially sandwich structure with a drive cone in the
subject. Get a shaped diaphragm. Here, the surface plate 8 is formed of a metal foil such as
aluminum or asoreminium alloy, titanium or the like, which is shaped according to the inner
peripheral rim diameter of the outer shell 7 by providing a rim around the periphery. . The
surface plate to be mounted / joined as described above is formed by bonding the core material 6
provided with the adhesive layer 9-1 on the inner side except for the substantial part of the drive
cone opening. Also, the bonding of the face plate to the inside of the shell 7 is achieved by
providing an adhesive layer 9-2 on the outside of the rim around the face plate, and bonding the
peripheral rim to the inside of the upright rim of the shell 7, Harden the adhesive (here, hard
resin or better) and bond. In this way, it is possible to obtain a force transmission system for
reaching the surface plate 8 partially from the outer resin layer 7 including the drive cone and
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the adhesive layer 9-2 made of hard resin. Further, as a modification of the basic form shown in
FIG. 3, there is a form shown in FIG. In this case, a circular metal foil auxiliary back plate 10 is
provided at the opening of the drive cone to close the cone opening, and all the face plates have a
sandwich structure.
Hereinafter, specific examples of the present invention will be described in detail. [Example 1] A
predetermined thickness of 15 μm is used as the material to be molded of the surface plate 8 on
the sound wave emitting surface side, and a thickness of 30 μm is used as the material to be
molded of the outer shell 7 Retain in the mold, hold at a temperature of 240 to 270 ° C, blow
the gas heated and pressed to a temperature of 250 to 300 ° C, 9 pressure 2 to 201, press the
material to be molded against the mold, and shape it , Surface material 8 and shell 7 were
obtained. The temperature and the pressure can be selected appropriately from the above range
of values depending on the thickness and shape of the material to be molded. The outer diameter
of the shell 7 thus obtained, the height of the circumferential rim, the diameter of the drive cone
opening, and the height of the cone are each 50 throats. The outer diameter of the surface plate
8 on the sound wave emitting side and the rim height of that portion are 49.5 嘔 and 2ymn,
respectively. Subsequently, a plastic foam having a bulk density of 0.04 to 0.0439 / ci, which is
to be the core material 6, is pushed into the inner plate portion of the surface plate 8 obtained
above. Here, the mutually adjacent surfaces are joined by the adhesive layer 9-1. Next, a hard
adhesive layer 9-2 is provided on the relevant portion of the shell 7 coming into contact with the
face plate 8, the face plate 8 is attached thereto, and the adhesive is cured by heating to form an
outer shell. 7 and the surface plate 8 were joined to obtain a diaphragm of the subject. The
weight of the diaphragm was 0, 59, and the high resonance frequency was 7 Hz. Example 2 The
material to be molded of the outer shell 7 in Example 1 was changed to a titanium foil of 25
.mu.m, and a diaphragm was prepared in the same manner as in Example 1 except for the
material and structure of the other parts. The vibration and weight of the plate were 0.559, and
the high resonance frequency was 7.5 kHz. EXAMPLE 3 In addition to the diaphragm in Example
1, a diaphragm provided with an auxiliary back plate 1o of corrosion-resistant aluminum foil
having a thickness of 15 .mu.m as shown in FIG. 4 in the drive cone opening is obtained. The The
weight of the diaphragm was 0.519, and the high resonance frequency was 8 kHz. In each of the
embodiments described above, although the mid-range reproduction speaker diaphragm has
been described, it is apparent that other low-range speakers and high-range speakers can be
produced by the same method according to the present invention. In addition, the above
description is all in the case where a drive cone is used as a drive transmission body, or in the
case where a cylinder is used instead of a cone and a voice coil is wound around this, the same
effect is obtained. Is obtained. As described above, according to the present invention, an outer
shell integrally formed of a disc component having a rim at its periphery and a drive
transmission body is formed by simple drawing, and this is used as an aggregate and a disc with
a drive transmission body. By forming the diaphragm, it is possible to obtain a high-rigidity
diaphragm with less force transmission loss.
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In addition, since the method used for producing the diaphragm of the present invention
eliminates bonding with an adhesive as much as possible, an effect that the method 1 is
simplified can be obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 (a) is a schematic cross-sectional view of a sandwich structure of a disk-shaped diaphragm
according to the prior art, FIG. 1 (b) is a partial cross-sectional schematic view showing details of
the part A in <al>, and FIG. 1 is a sectional view of a disk type diaphragm with a drive cone
according to the disk of FIG. 1, FIG. 3 (b) is a partial sectional view showing details of the B
portion in FIG. 3 (a), FIG. 3 (a) is a drive cone according to the present invention Sectional view
showing the basic configuration of the disc type diaphragm with body, FIGS. (B) and (C1 are
partial sectional views showing the details of the C part and D part in (a) respectively, FIG. 4 (al:
according to the present invention FIG. 11 is a cross-sectional view showing a modified example
of the diaphragm, and FIG. 11 (h) is a partial cross-sectional view showing details of a portion E
in ta.
Explanation of symbols 1 ... core material 2-1.2-2 ... surface material 4 ... drive cone 6 ... core
material. 7 · · · Outer shell 訃 · · surface plate 9-1.9-2 · · · adhesive layer 10 · · · auxiliary back plate
attorney patent attorney Junnosuke Nakamura 1 '1 (b) IPZ Figure 3 1'4 Figure (Q)
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