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JPS61154300

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DESCRIPTION JPS61154300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker. [Prior Art] A typical flat diaphragm generally used for a speaker has a
honeycomb core material f1 provided in a flat plate shape as shown in FIG. Skin materials (3) and
(4) are adhered to both sides of l through adhesive layers (2), respectively. When a diaphragm
having such a configuration is used for a speaker, the sound pressure frequency characteristics
thereof are as shown by the curve (H in FIG. 4). At this time, a peak of about 20 dfl occurs at 2
kHz due to the height of Q of the diaphragm constituent material. This frequency (i.e., the high
frequency limit frequency fh) changes depending on the size of the diaphragm, but the peak
height does not change so much with the typical configuration of FIG. Also, this peak is very
audible to the ear, which is one of the major factors limiting the use band in the high region of
the unit when constructing a so-called multi-speaker system. Therefore, various efforts have been
made to reduce the height of the peak. For example, as shown in FIG. 6, a thickness of 0.3 to 0,
with an adhesive layer (2) between core material f11 and skin materials (3) and (4)! A diaphragm
provided with a damping layer (5) of 'imm urethane has also been proposed. (Problems to be
Solved by the Invention) However, despite such efforts to arrange the urethane layer, undesirable
results such as increase in mass and decrease in peak frequency fh occur. For example, when the
damping layer (5) of urethane is inserted, the sound pressure frequency characteristic becomes
as shown in the curve (n) of FIG. 4, and it is recognized that the sensitivity is lowered by the
increase of mass although the peak is suppressed. Be The present invention provides a
diaphragm for a speaker which can reduce the additional mass and suppress the peak at the
frequency fh generated on the sound pressure frequency characteristics to a low level. [Means
for Solving the Problems] In the diaphragm of the sand-inch structure in which the skin material
is disposed on both sides of the core material, the present invention is constructed by providing
the skin material with a damping layer of an acrylic viscoelastic sheet. . In this case, the acrylic
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1
viscoelastic sheet is disposed between the core and both skins, or between the core and either
skin. In addition, cover the damping layer of the acrylic visco-elastic sheet and paste the skin
material on both sides, regard it as a new skin material, and place this skin material on both sides
of the core material or any one of them. . [Operation] By providing the damping layer of the
acrylic viscoelastic sheet on the skin material of the sand-in-place diaphragm, the peak at the
frequency fh generated on the sound pressure frequency characteristic can be suppressed low.
Further, the amount of addition of the damping layer by the acrylic viscoelastic sheet is small, so
the sensitivity does not decrease. Embodiments of the diaphragm according to the present
invention will be described below. FIG. 1 is an embodiment of the present invention. In this
example, an acrylic visco-elastic sheet (Vjsco I 'made by Sumitomo 3M) has an adhesive property
of about 50 μm on the inner surface on both surfaces of a flat plate-shaped core material (1) of
a honeycomb structure. 1astic Material (FRPt νI '! M)) The skin materials (3) and (4) to which
the damping N (6) is bonded are adhered via an adhesive layer (2). FIG. 2 is another embodiment
of the present invention. In this example, a skin material (3) obtained by bonding the damping N
(6) with the above acrylic viscoelastic sheet is bonded to one surface of a core material (1) of a
honeycomb structure, and the other surface of the core material (1) is Only the core material (4)
is adhered. The weights of the diaphragm of the present invention and the diaphragms of FIGS. 5
and 6 of the prior art are shown in the following table. On each side, a diaphragm with a
diameter of 200 m and a thickness of 8 dragons was used. The core material has a honeycomb
structure of aluminum, a pitch of 1/4 inch, a core height of 8 N, and a skin material of 40 μm
thick. On the surface, the sound pressure frequency characteristic of the speaker using the
diaphragm of the present invention shown in FIG. 1 is as shown by the curve (Iff) in FIG. 4 and
the peak at the high frequency limit frequency fh is about 6 dB. I'm back. In addition, also in the
case of FIG. 6 using a urethane damping | braking layer, about suppression of a peak, as shown
by a curve (Tr), it is substantially the same as this invention. However, when viewed in terms of
mass, as apparent from the table, the diaphragm of the present invention of FIG. 1 is 5.5 g lighter
than that of FIG. 6, and the sensitivity is not damped. It is about the same as the moving plate of.
The diaphragm in FIG. 6 with the urethane damping layer has a reduced sensitivity. Furthermore,
in the case of FIG. 2 in which the damping layer (6) of the acrylic viscoelastic sheet is disposed
only on one skin material of the diaphragm, the peak at the frequency fh occurs only up to about
8 dB, although it is not shown In terms of surface, it is 7.9 g lighter than that of FIG. 6 with the
urethane damping layer, and it is only 2.4 g more than that of FIG. 5 without braking. On the
upper side, the damping layer of the acrylic viscoelastic sheet is bonded to the inner surfaces of
the skin materials (3) and (4), but, for example, the damping N (6) of the acrylic viscoelastic sheet
is used as shown in FIG. Skin materials (7) and (8) may be attached to both sides so as to be
wrinkled, and this may be regarded as a sheet of skin material, and this skin material may be
disposed on at least one of the core materials Tll.
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[Effects of the Invention] According to the present invention described above, in the diaphragm
of the sand-inch structure in which the skin material is disposed on both sides of the core
material, the skin material is provided with the damping layer of the acrylic viscoelastic sheet.
The peak at the upper limit frequency fh in the sound pressure frequency characteristic can be
suppressed without losing the In addition, the weight can be reduced as compared with the
conventional one using a damping material such as a urethane layer. In addition, since the Aclifftype viscoelastic sheet itself has adhesiveness, if aluminum or the like is used as the skin
material, it is possible to reduce the number of adhesive layers, and weight reduction proceeds
further. In addition, the cell noise phenomenon peculiar to a flat-plate diaphragm having a sandin structure can be reduced by the allocation of the skin material.
[0002]
Brief description of the drawings
[0003]
1 and 2 are sectional views showing an embodiment of the diaphragm according to the present
invention, FIG. 3 is a sectional view showing another embodiment of the present invention, and
FIG. 4 uses the diaphragm of the present invention A sound pressure frequency characteristic
diagram comparing a speaker and a speaker using a conventional diaphragm, and FIGS. 5 and 6
are cross-sectional views of the conventional diaphragm, respectively.
(]) Is a core material, (2) is an adhesive layer, +31 +41 +71 +81 is a skin material, (5) is a
urethane damping layer, and (6) is a damping layer of an acrylic viscoelastic sheet.
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