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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional wick core
and FIG. 2 is a schematic view of the diaphragm for an acoustic device according to an
embodiment of the present invention before rotational expansion of the cam core. Fig. 3 is a
schematic diagram after rotational expansion of the cam core material, Fig. 4 is a side view of the
diaphragm, A is a disk shape, the mouth is a conical shape, and Fig. 5A is a waveform on the
outer peripheral surface of the core material. FIG. 6 is a front view, a side view, and a side view of
a state in which the tape is attached; FIG. 6 is a view showing the acoustic characteristics of the
diaphragm according to the present invention in comparison with the conventional product; In
comparison. 3 ...... honeycomb core, 4 ...... adhesive, 5 ...... surface agent, 6 ...... corrugated tape.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for
audio equipment, which is made of a metal foil such as aluminum or titanium, a plastic film such
as polyester or polyvinyl chloride, or a paper stub such as kraft paper. 42, B, 102 Koni · · · · · カ
ム with a cell shape in which the light, degree 2 and +-/ increase in steps towards the center
direction A whole panel material of A-face material is bonded It is what has a good flat
diaphragm of frequency custom-made by what it has. In addition, in the above structure, the back
surface of the moving plate is conically shaped to obtain even better characteristics. By attaching
a corrugated tape to the outer peripheral surface of the diaphragm core, an abnormal sound is
generated. To prevent. In the past, as a flat diaphragm, it has a sand-in-in diaphragm made of
polystyrene and urethane as core material, aluminum and plastic as a facing material, and a
honeycomb with a hexagonal cell shape with aluminum and plastic as a core. There is a sandwich
whaling diaphragm made of wood. Because the former moving plate has a small specific elastic
modulus (4 pieces ratio / strength) of the moving plate and a small bend of 1 to 1 unit per unit
weight, the former moving plate has a high frequency and strictness. Zhou had the disadvantage
that his number was low and the sound reproduction band was narrow. The latter has a relatively
large specific elastic modulus, and also has a large unit weight per unit area of 1 to 3 and
bending 1-11. It is being used as a heartwood -1 \ '"ν while scolding! ・ Nikam material is
sufficiently satisfactory in anisotropy due to its 〆3i- リ in strain and sound reproduction zone,
and it is 0 in this case. The diaphragm of the conventional honeycomb core material is used in
FIG. 1 The schematic diagram is shown. 1 is a honeycomb material and 2 is an adhesive. The
present invention eliminates the above-mentioned conventional drawbacks. The present
invention is entirely characterized in that a face plate is attached to a honeycomb-like core
material of a density distribution type in which the cell shape becomes smaller toward the center
when rotating and stretching to obtain a diaphragm. FIG. 2 schematically shows the state before
cutting and stretching the honeycomb according to the present invention. Here, 3 is a
honeycomb material, and 4 is an adhesive for bonding the respective honeycomb materials 3 to
be creased A. In this case, in the present invention, the welding positions are not equal. In FIG. 2,
assuming that the right end is a center portion and the left end is an edge portion, the distance
between the bonding positions is increased by ρ) from the center portion to the edge portion.
That is, a, b, c, d, e are the intervals of each adhesive 4. 1、qとしたと
@a<b<c<d<e<f<qと〕 へしている。 This is a point different from the
conventional bar cam = i4-.
FIG. 3 schematically shows a state in which the honeycomb 3 of FIG. 2 is rotationally expanded.
As apparent from the figure, the average density in the central portion is large, and the density
decreases toward the edge. The shape of the diaphragm as viewed from the side is shown in FIG.
Fig. 4 (a) shows a disk-shaped one, and Fig. 4 shows that the rear side is formed conically at 3-.
FIG. 6 shows a diaphragm formed by sticking the two surface materials 6 of the coating / back
direction vc2 of the honeycomb 3 and sticking the corrugated tape 6 to the outer peripheral
portion of the honeycomb core 3. As described above, in the case of a disk shape, by pasting the
corrugated tape 6, the strong # can be made cylindrical and the end face of the surface material
etc. which does not have the cell shape of the outermost periphery (shaded in FIG. It is possible
to prevent the generation of the abnormal sound from the part]. The details will be described
below according to the present invention. I Reno 6 <Practical column> Aluminum M is used as a
constituent material of the core material 3. This aluminum has a purity of 99, manufactured by
Toyo Aluminum Co., Ltd. As the adhesive 4, a thermosetting epoxy-based adhesive was used,
using 6% 1N 30 and a thickness of 20 μm. The number of laminated aluminum sheets was 72
sheets, and the diameter of the rotationally expanded core material was 191 knitting φ, and the
weight was 8 qb, thickness 16 knitting disc type and the center was 20111. The outer periphery
was formed into a conical shape having a thickness of 61 m, and a corrugated aluminum foil of
the same material was attached to each outer peripheral surface of b. Thereafter, aluminum 4
gold of the same material having a thickness of 60 μm was attached to the front and back
screens of the core material, and a diaphragm having a weight of 189 was obtained. An epoxybased adhesive was used to bond all of the corrugated aluminum foil and the aluminum foil
which is the surface material. The disk-shaped diaphragm obtained as described above was
assembled as a speaker with a nominal 26 diameter and used for acoustic measurement. 1 with
the same material and the same weight and the same thickness shown in Fig. 1 as the core
material for comparison, and attaching the surface material by the same method using the
diaphragm as the center plate, the case 5, ff 6 and Fig. 1 Figure 6 shows the sound customdesigned ones of the same moving plate with the distribution density given by rotating and
stretching the regular-spaced honeycombs of the above in Fig. 6 □, where A is a custom · · ·
custom-made custom-made material However, C shows the special order of the diaphragm by C
ingenuity although the special property of what rotated and expanded the conventional
honeycomb material. As is clear from the results shown in FIG. 6, it can be seen that the
frequency characteristic band of the moving plate according to the present invention is wider
than that of the pond. Also, FIG. 7 shows the results of measurement of the disk-shaped and
conical diaphragms produced under the same conditions in the same manner.
As can be seen in the figure, where A indicates a disk-shaped characteristic and B indicates a
conical-shaped characteristic, the band of the frequency e characteristic is wider than that of a
disk-shaped by making the diaphragm of the diaphragm conical. Further, as shown in FIG. 6, by
forming the outer peripheral portion of the wick core 3 with the corrugated aluminum film 6,
generation of abnormal noise from the portion 2 where the cell shape of the outer peripheral
portion is not formed and the outer periphery of the core 4. Can be prevented · · · · · The
diaphragm according to the present invention has a structure of 7/7-Tuchi, and the average
density is larger as the structure of the core material is closer to the center, and further, the
diaphragm according to the present invention When viewed as an imaging plate, the frequency
characteristic is extremely good because of the isotropy, and in particular, the high-resonance
frequency can be extended. At this time, by forming the back surface of the diaphragm in a
conical shape, the frequency characteristics can be further improved as compared with the disk
shape, while the surface of the diaphragm is crimped to the outer peripheral portion of the wick
core. It is possible to prevent the occurrence of an abnormal person from the portion of the
material outer peripheral portion not forming the cell shape and the outer periphery of the core
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