JPS5433637

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DESCRIPTION JPS5433637
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing
an embodiment of an acoustic diaphragm of a flat type speaker to which the present invention is
applied. 2A and 2B are a perspective view and a cross-sectional view showing an embodiment of
a corrugated plate applied to the present invention. 3A and 3B are a perspective view and a cross
sectional view showing another embodiment of the corrugated plate. 4A2 and 4B are a
perspective view P and a sectional view showing still another embodiment of the corrugated
plate. FIG. 5 is a partially cutaway perspective view showing an embodiment of a sounding
diaphragm of a sit-con type speaker to which the present invention is applied. 1.4 ...... open
section, 2,5 ...... corrugated plate, 3,6 ...... flat plate, 7,8 ...... tubular portion, 10 ..... Diaphragm for
sound.
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.
Conventionally, in the case of a single-plate acoustic diaphragm, the above-mentioned
characteristics can not be satisfied sufficiently, so that an acoustic diaphragm having a
honeycomb structure or a metal foam structure has been proposed. In any case, it takes time and
effort to manufacture, and it is manufactured at low cost. It is not something that can be beaten.
Therefore, the present invention is characterized in that it has a structure in which the abovementioned main parts are laminated so that the direction of the lines crosses, with the corrugated
plate in which the concavo-convex streaks are repeated as the main part, and has at least a twolayer structure. By using the diaphragm for sound material, it is intended to provide a diaphragm
that can fully satisfy the above-mentioned characteristics as shown in FIG. 9 in order to reduce
the weight and increase the strength of the diaphragm at low cost. Hereinafter, the present
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invention will be described in detail with reference to the drawings showing one embodiment.
FIG. 1 shows an external perspective view of an embodiment in which the present invention is
applied to an acoustic diaphragm used for a flat speaker. In FIG. 1, 1 is a first main portion
formed by fully bonding the first flat plate 3 to one side surface of the first corrugated plate 2 in
which the uneven streaks are repeated, and 4 is formed by repeating the uneven streaks This is a
second main part in which the second flat plate 6 is attached to one side surface of the second
corrugated board 5, and each of the above-mentioned main parts 1 ° 4 Each tubular portion 7,
8 (2) is formed in series by joining the flat plates 3.6 to the side surface. And each said main part
1 and 4 valve ¦ bulbs the 3rd plane board 9 of lamination t1 so that each part direction (namely,
line direction of the uneven part) of each cylindrical part 7 and 8 intersects mutually. The other
side of the valley corrugated plate 5 ° 6 is joined. That is, in this embodiment, the first main
portion 1 having a series of cylindrical portions 7 formed by joining the first flat plate 3 to the
upper surface of the corrugated plate 2 of U and il, and the second corrugated plate 5 By
laminating the second main part 4 having a series of cylindrical parts 8 formed by joining the
second flat 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. Each waveform h. It is good to have two or five or five or more than six or six. Here, in
this embodiment, as shown in the perspective view of FIG. 2A and the cross-sectional view of FIG.
2B, the valley corrugated plates 2 and 5 have triangular waves in cross section or FIG. 3A. As
shown in the perspective view and the cross-sectional view of FIG. 3B (3), the cross-section has a
sine wave shape, and the cross-section has a rectangular wave as shown in the perspective view
of FIG. 4A and the cross-sectional view of FIG. A shape or the like may be used.
In general, corrugated plates having these various cross-sectional shapes have curvatures with
directionality in the characteristics of rigidity, high bending rigidity in the cylinder direction in
the present invention, and bending rigidity in the direction orthogonal to the cylinder direction.
small. In the above-described embodiment, the layers 1 and 4 are joined via the third plane plate
9 to form a two-layer structure, but the present invention may have a two or more-layer
structure, and In the case where each local portion 1 ° 4 is formed by using the abovementioned rectangular corrugated plate, the third flat plate 9 may not be used when sufficient
bonding strength can be obtained. And in the embodiment as described above, each of 4 fltu 1
and 2 having a series of cylindrical portions 7 and 8 formed by joining the flat plates 3 and 6 to
one side surface of the valley corrugated plates 2 and 5 respectively The corrugated plates 2 and
5 are mutually laminated so as to completely cross each other in the partial direction, and the
curved plates 2 and 5 mutually reinforce the rigidity and can not be stretched when the acoustic
diaphragm 10 is bent. (4) A force is applied to the flat plate to extend either of the flat plates 3
and 6.9, so that the corrugated plates 2 and 5 can be prevented from being deformed so as to be
twisted, and the bending rigidity as a whole is sufficient. It is a large diaphragm. If the line
directions of the corrugated plates 2 and 5 are orthogonal to each other, sufficient curvature can
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be obtained without using the valley flat plates 3 and 6. Furthermore, since the acoustic
diaphragm 10 has a structure in which the corrugated plates 2 and 5 are laminated, the weight is
extremely small with respect to the thickness t. Such an acoustic diaphragm 10 is optimal as a
high performance diaphragm because the longitudinal wave propagation velocity and bending
rigidity are sufficiently large. The acoustic characteristics of the acoustic diaphragm 10 can also
be changed by changing the shape or material of the corrugated plates 2 and 5. In addition,
although the above-described embodiment is applied to the acoustic diaphragm of a flat speaker
according to the present invention, as shown in FIG. 5, the present invention provides a cone by
forming each local portion 1.4 in a cone shape. The same effect as described above can be
obtained (5) even when applied to the acoustic diaphragm of the speaker. In the embodiment
shown in FIG. 5, the same components as those of the embodiment shown in FIG. In addition,
when applying this invention to the diaphragm for sound of a cone type speaker, the cylindrical
part 8 of the 2nd main part 4 is radially formed centering ¦ focusing on the cone top part 11 to
which the voice coil which is not illustrated adheres. This makes it possible to increase the
bending rigidity particularly in the vicinity of the cone top 11, so that it is possible to improve
the frequency characteristics of the mid-high range.
As described above, according to the present invention, since the 0 layer portion is laminated
with the corrugated plate formed by repeating the uneven streaks as the main portion, the
diaphragm is sufficiently heavy in comparison with the thickness. It will be small. In addition,
since the diaphragms are stacked so that the respective strips cross each other, the diaphragm
has a sufficiently high bending rigidity. Since the corrugated plate is stacked on the field to form
the vibration &, it is possible to provide a low cost diaphragm which is extremely easy to
manufacture as compared with the conventional honeycomb structure. Therefore, the intended
purpose can be sufficiently achieved (6).
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