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The present invention relates to a speaker diaphragm particularly suitable for high fidelity
reproduction. Generally, the characteristics required for the speaker diaphragm (aJ specific
elastic modulus (hereinafter referred to as vp, where E is an elastic force and I a degree of
stomach) are high, (bJ internal loss is large, (eJ Physical properties are isotropic and the like. It is
necessary that E / p is high in order to widen the frequency range where the diaphragm
performs piston movement as much as possible and expand the reproduction range, and that the
internal loss is large is the high frequency range where the diaphragm performs divided
vibration. It is necessary to smooth the sound pressure-frequency characteristics in Furthermore,
the fact that the physical properties are isotropic is necessary to suppress the occurrence of
resonance that is the main cause of the bending deformation of the diaphragm and to reduce the
distortion of sound. In order to satisfy such requirements, a diaphragm having a sandwich
structure in which a honeycomb structure is used as a core and skins are attached on both sides
of the core has been put into practical use in recent years. A diaphragm in which an outer surface
made of raised nine paper foils is laminated via an adhesive is an excellent one having
synthetically well-balanced acoustic characteristics. However, while this diaphragm has the
above-mentioned excellent advantages t, there is a problem that the piston movement area is
narrow and the expansion of the high range is small because the E / ρ of the skin which is the
skin is low. There is a method of increasing the E / p of corn paper and the pressing pressure
after milling to increase the entanglement between fibers, but with a cone-shaped press, there is
a limit to the pressing pressure, so E2 now Can not be expected. Moreover, in the method using
the bonding cone of the sheet-like papermaking paper in which the press pressure can be
relatively increased, the distortion of the sound of the speaker increases because the sheet has
anisotropy in the physical characteristics in the longitudinal direction and the lateral direction.
The present invention has been made to eliminate the above-mentioned conventional defects, and
in the honeycomb structure of a honeycomb structure, a sheet of continuous paper making sheet
that has been fanned out as a skin is used as a skin and pasted together in a cone shape. E / ρ is
made high by making the direction in which the sheet is cut out from the sheet and the joint
direction of the skin when laminating the two skins in contact with both sides of the core at the
same time. It is an object of the present invention to provide a speaker diaphragm IIB board
having a pseudo-isotropy, which expands a reproduction region and cancels the anisotropy.
Hereinafter, embodiments of the speaker diaphragm of the present invention will be described
with reference to the drawings. aF! FIG. 1 is a partially cutaway plan view of one embodiment,
and FIG. 2 is a cross-sectional view.
In both FIGS. 1 and 2, “l” is a paper honeycomb core having a thickness of 3 mm and a cell
size of 9 mm, and “2” is a sheet of continuous paper (resolution 66, paper made of% paper)
And a surface layer b in contact with both the front and back surfaces of the core 1, and 3 is an
adhesive for bonding the honeycomb core 1 and the surface layer 2. This continuous papermaking sheet company, for example, a carton made of printing paper, is a paper made at a large
press pressure and having a high E / p as compared to a paper made into a cone shape. Using the
skin 2 consisting of such a continuous papermaking sheet and the sheet 5 consisting of the
honeycomb core 1 and the adhesive 3, first, as shown in FIG. After cutting out the fan shape 7
and 8 so as to be parallel and perpendicular to the paper making direction 6 of the sheet 5, as
shown in FIG. Obtain a corn-like epidermis 2. Next, the two skins are pasted on both sides of the
core 1 using the adhesive 3 so that the direction of the joint 9 is 180 @, and then compression
molding is performed for about 15 minutes at room temperature. By curing the adhesive, a quasiisotropic diaphragm can be obtained. The performance of this diaphragm is shown in Table 1 for
the values of E / ρ and internal loss according to the vibration lead method, and the sound
pressure-frequency characteristics as a speaker are shown by a solid line in FIG. In Table 1, the
skin, core and adhesive of the same material as in the above embodiment are used, and the
diaphragm and the core of the same material as in the above embodiment are bonded together
with the diaphragm (comparative example 2) having an angle of 90 ° The performance with the
diaphragm (comparative example 2) which made the paper foil which was made into a cone
shape into a skin using an additive is shown as a comparative example. Further, the sound
pressure-frequency characteristics of the diaphragm according to Comparative Example 1 and
Comparative Example H are indicated by the broken line B and the alternate long and short dash
line C in FIG. <a! 1) As shown in Table 1, the diaphragm according to the present invention
has the same performance in terms of internal loss as compared to the paper foil made into a
cone, but E / 大 き く becomes large. Also, when the joint direction is 90 @, the performance is
about the same as E, * internal loss. On the other hand, when comparing the sound pressurefrequency characteristics of FIG. 5, the diaphragm according to the present invention shown by
the “characteristic A” is E compared to the diaphragm with the grinding cone shown by the
characteristic C as the skin. Since / p is high, the beginning of the fluctuation of the frequency
characteristic in the high range extends to the high frequency side. As a result, the reproduction
area of the speaker is wide. Also, in the case of a 1Ii1a plate having a joint direction of 90 @,
which is indicated by the characteristic B), the degree of variation of the frequency characteristic
in the low frequency range is small, and hence the distortion of the sound is reduced.
The honeycomb core IK used in the present invention may be of various cell sizes and
thicknesses other than those of the above-described embodiments, and may be a mixture of
metal or polymer or paper and polymer as materials. Further, as the adhesive, a liquid adhesive
such as epoxy type or modified acrylic type, a heat melting type adhesive such as polyamide type
or 4 polyester type, or a powder type thermosetting m adhesive such as an epoxy type or 4 type
riamide type Although there is an agent, in any case, the same effect as that of the above
embodiment can be obtained. As described above, according to the speaker diaphragm of the
present invention, the honeycomb structure is used as a core, and a sheet made of continuous
paper-making paper cut out into two 1iiK sectors is adhesively bonded to a cone. Cut the sheet so
that the bisecting line of the fan-shaped cutting angle is parallel and perpendicular to the sheet
making direction, and the two skins have their joint direction Because they are laminated so as to
form 180 °, and have a honeycomb structure of the diaphragm, they have well-balanced
acoustic characteristics in a comprehensive manner, and in particular, they have high E / p so
that the reproduction area is wide and there is no anisotropy. It can be made more anisotropic
and less distortion of the sound. In addition, the economic value is great because it is not only
high-performance but also excellent in productivity and formability.
Brief description of the drawings
FIG. 1 is a partially cutaway plan view of one embodiment of the speaker diaphragm according to
the present invention, FIG. 2 is a cross-sectional view of the same speaker diaphragm, and FIG. 3
is a fan-shaped cut # of the above speaker diaphragm) The figure which shows rice, FIG. 4 is a
figure which shows a bonding cone, FIG. 5 is each characteristic figure which compared the
sound pressure-frequency characteristic of the diaphragm for speakers by this invention, and the
diaphragm for speakers of the prior art. is there.
l · · · · · · · · · · · · · · · · · · honeycomb core, 2 · · · skin, 3 · · · adhesive, 4 · · · bisecting angle of cutting
angle 5 --Form a, 8-Sector b, 9-Joint. In the drawings, the same reference numerals indicate the
same or corresponding parts. Agent Shino Nono Fig. 1 Fig. 2 Procedure correction (from-) April
12, 1979, President of the Patent Office Palace 1, display of the case Relationship with the
Japanese Patent Application No. 66-19425'51 Case Patent Applicant representative Hirano
Katayama Part 4, agent fl Office Marunouchi 2-chome, Marunouchi, Chiyoda-ku, Tokyo 5 -6 of
the detailed description of the invention of the object of correction -6, contents of correction (1)
The "sheet" on page 7, line 7 is corrected to "sheet 5". (2) On page 4, line 10, "It is an adhesive."
Is an "adhesive, and in this embodiment a urethane-based adhesive (UX-2000R: manufactured by
Denki Kagaku Kogyo) is used. To correct. (3) The "sheet" on page 4 line 11 is corrected to "sheet
5". (4) Delete “Consists of a sheet... Consist of” on page 4, lines 15 to 16. (5) On page 5, lines
18 to 19, correct "break @ B and one-point chain 11 CJ as" one-point chain @ B and break II C ".
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