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JPS5796592

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DESCRIPTION JPS5796592
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing
an example of an acoustic diaphragm of a flat type speaker. 2A and 2B are a perspective view
and a cross-sectional view showing an example of a corrugated plate. 3A and 3B are a
perspective view and a cross-sectional view showing another example of the corrugated plate. 4A
and 4B are a perspective view and a cross-sectional view showing an embodiment of a
corrugated plate applied to the present invention. FIG. 5 is a partially cutaway perspective view
showing an embodiment of the acoustic diaphragm of the flat type speaker to which the present
invention is applied. FIG. 6 is a partially cutaway perspective view showing an example of an
acoustic diaphragm of a course type speaker to which the present invention can be applied. FIG.
7 is a partially cutaway perspective view showing an embodiment of the acoustic diaphragm of a
cone type speaker to which the present invention is applied. 20a、20b、22a、22b、
25a、25b。 122a, 122b, 125a, 125b = flat surface, 21,24,121,124 ...... layer portion, 22 °
25.122,125 ...... corrugated plate, 23 and 26 ° 123.126 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Surface plate, 27.28, 128 · · · · · · · · · cylindrical portion 30, 130 · · · · · · · · · · acoustic diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic
diaphragm having an improved structure to increase longitudinal wave propagation velocity and
flexural rigidity. In general, the acoustic diaphragm is required to have characteristics of high
longitudinal wave propagation speed and flexural rigidity, and it is necessary to have a structure
sufficiently satisfying the above characteristics particularly when high performance is required.
Heretofore, since a single plate acoustic diaphragm can not fully satisfy the above-mentioned
characteristics, a honeycomb acoustic diaphragm or a metal foam structure i-angle .sigma.
However, in the prior art, all of them are laborious to manufacture and can not be manufactured
at low cost. Therefore, according to the present invention, the corrugated plate is laminated so
that the corrugated plate is formed by repeating the uneven streaks having flat surfaces
respectively formed along the valley portion and the peak portion so that the streak directions
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are orthogonal to each other. The acoustic diaphragm is characterized by direct bonding to each
other in a face-to-face fashion, and a small number of old two-layer structures, and by making the
acoustic diaphragm characterized in that surface plates are joined on both sides, weight
reduction and strength increase of the diaphragm It is an object of the present invention to
provide at a low cost a diaphragm which fully satisfies the above characteristics. Hereinafter, the
present invention will be described in detail according to the drawings. An external perspective
view of an example of an acoustic diaphragm used for a flat speaker to which the present
invention can be applied is shown in FIG. In FIG. 1, 1 is a first main portion formed by bonding
the first surface plate 3 to one side of the first corrugated plate 2 in which the uneven streaks are
repeated, and 4 is the uneven streaks. The second main portion is formed by sticking the second
surface plate 6 to one side surface of the second corrugated plate 5 which is repeated, and each
of the above main portions 1 ° 4 corresponds to the respective corrugated plate 2, Each tubular
portion 7 and 8 is formed in a series by joining the surface plates 3.6 to one side surface of the
cylinder 5. Then, the main parts 1.4 described above are laminated such that the directions of the
respective parts of the respective cylindrical parts 7 and 8 (that is, the line directions of the
concave and convex line parts) cross each other, through the flat plate 9 The other side of each
corrugated plate 5, 6 is joined. That is, in this example, the first main portion 1 having a series of
cylindrical portions 7 formed by joining the first surface plate 3 to the upper surface of the first
corrugated plate 2, and the second corrugated plate 5 By laminating the second main part 4
having a series of cylindrical parts 8 formed by bonding the second surface plate 6 to the lower
surface of the lower part so that the part directions of the respective cylindrical parts 7 and 8
intersect The acoustic diaphragm 10 of a two-layer structure is formed. And such a diaphragm
10 for acoustics is formed with materials, such as paper and aluminum. The corrugated plates
2.5 and the front plates 3 and 6 may be formed of different materials 3--7 /.
Here, as shown in the perspective view of FIG. 2A and the sectional view of FIG. 2B, each of the
corrugated plates 2 and 5 has a triangular wave shape in cross section, or the perspective view of
FIG. As shown in the cross-sectional view of Fig. 3B, it is conceivable that the cross section has a
sine wave shape, but since both of them have no flat surface at the top of the uneven streaks, the
first binding portion 1 and the second binding portion 4 When laminating the layers directly, the
adhesive strength is extremely weak because the points of intersection of each strip are point
contacts. Further, even if they are joined via the flat plate 9, only line contact is old and it is
impossible to obtain sufficient strength as a diaphragm. Generally, corrugated plates having these
various cross-sectional shapes have directionality in the characteristics of flexural rigidity, are
formed of corrugated plates, have a large flexural rigidity in the direction of the part of the
cylindrical portion, and are orthogonal to the direction of the part. The bending stiffness is small
in the direction. Therefore, in the present invention, as shown in the perspective view of FIG. 4A
and the cross-sectional view of FIG. 4B, for example, the cross section has a square wave shape,
etc. A corrugated 4-plate 20 with 20a, 20b is used. That is, as shown in FIG. 5, by forming the
main parts 21. 24 using the rectangular corrugated plate 22. 25 and directly joining the flat
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surfaces 22b and 25a facing each other of the uneven streaks, surface contact is achieved. Since
a sufficient bonding strength can be obtained without using the flat plate 9, the weight becomes
lighter than that shown in FIG. Here, in the embodiment shown in FIG. 5, the main parts each
having a series of cylindrical portions 27. 28 formed by bonding the front plates 23. 26 to one
side of the corrugated plates 22. 25. In this structure, the corrugated plates 22.25 reinforce the
bending stiffness of each other, and the acoustic diaphragm 30 can be bent. Since the force to
stretch any of the face plates 23.26 that can not be stretched is applied to the face plates, it is
possible to prevent the corrugated plates 22.25 from being deformed to twist, and the overall
bending rigidity is sufficient. Has become a large diaphragm. Furthermore, since this acoustic
diaphragm 20 has a structure in which the corrugated plates 22. 25 are laminated, the weight is
extremely small with respect to the thickness 1 thereof. Such an acoustic imaging plate 20 is
suitable as a high-performance diaphragm because the longitudinal wave propagation velocity
and bending stiffness are sufficiently large. The acoustic characteristics of the acoustic imaging
plate 20 may be changed by changing the shape or material of each of the corrugated plates
22.25. In the above-described embodiment, each binding portion 21 ° 24 is joined to form a
two-layer structure, but the present invention may have a two or more-layer structure.
In the above embodiment, the present invention is applied to the acoustic diaphragm of the flat
speaker, but the vibration of the cone type speaker as shown in FIG. 6 in which each of the
binding portions 1.degree. Even when the present invention is applied to a plate, the same effect
as described above can be obtained. That is, FIG. 7 shows an embodiment in which the present
invention is applied to an acoustic imaging plate for a cone-shaped speaker, and a concavoconvex line concentrically centered on a cone top 131 to which a voice coil (not shown) is fixed.
The first main portion 121 with the cone = 6-no surface plate 123 adhered to the convex flat
portion flat surface 122a of the first corrugated plate 122 forming the first portion, and the
radial unevenness centering on the cone top 131 The second main portion 124 to which the
cone-shaped surface plate 126 is adhered is stacked on the flat surface of the concave portion of
the second corrugated plate 125 forming the linear portion, and the concave portion of the first
corrugated plate 122 is flat. A conical diaphragm 130 having a two-layer structure in which the
cross claws of the surface 122 b and the convex flat portion 125 a of the second corrugated
plate 125 are bonded and integrated is integrated. Each of the corrugated plates 122 and 125 in
this embodiment has a trapezoidal cross section and forms flat surfaces 122a, 122b, 125a and
125b. In the cone-shaped diaphragm 130 having the above-mentioned structure, the cylindrical
portion 128 radially arranged centering on the cone top 131 by the second corrugated plate 125
is formed as the second main portion 124 (especially the cone Since the bending stiffness in the
vicinity of the top can be increased, it is possible to improve the frequency characteristics of the
middle to high range. As described above, according to the present invention, since the main
portion is laminated with the corrugated plate formed by repeating the concavo-convex streak
portion as the main portion and the structure is 7--7 parts, the diaphragm has a thickness
compared to the thickness The weight will be small enough. In addition, since the diaphragm is
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laminated so that each strip direction of each binding portion intersects, the diaphragm has a
sufficiently high bending rigidity. Furthermore, since corrugated plates are stacked to form a
diaphragm, manufacture is extremely easy as compared with the conventional one with a nick
structure, and a low cost diaphragm can be provided. The purpose of the period can be
sufficiently achieved.
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