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JPS574885

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS574885
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view showing a part of the conventional
speaker diaphragm with a notch, and FIG. 2 is a cross-sectional view of a part of the speaker
diaphragm in one embodiment of the present invention, FIG. 3 is a sound pressure frequency
characteristic diagram of a speaker using the conventional diaphragm and the diaphragm of the
present invention. 1 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Surface Material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm. It is ideal for the speaker diaphragm to perform complete piston movement in the
usage wave number band, and if the diaphragm is deformed or split vibration occurs, basic
performance as a speaker, such as the same wave number characteristics for sound and
distortion factor, is degraded. , High fidelity reproduction is hindered. In recent years, a
diaphragm using a honeycomb sandwich structure or the like has come to be adopted to solve
these problems ff1k. 8. Using the above-described honeycomb sandwich structure diaphragm, '-)
according to the speaker, the piston vibration band is expanded, the sound-ball volume wave
number characteristic becomes flat, and the distortion factor becomes low ? ++ 5? In the second
year, the phase frequency characteristics become good because the plane of vibration is flat. In
order to fully expand the piston motion zone, it is necessary to form the diaphragm from a
material having a large specific modulus and to have a high flexural rigidity. Also, in order to
achieve this purpose, the thickness of the diaphragm is increased in the cavity, and the efficiency
as the whole of the speaker is lowered even if it is made of a material with high density. The
structure is adopted. Conventionally, an aluminum foil having a large specific elastic modulus
and relatively easy to thin is used as a material forming these structures. However, since
aluminum foil has a small plastic deformation load against bending stress (load at the time of
causing plastic deformation against bending stress), when aluminum foil is used as a surface
material of honeycomb core, the diaphragm is subjected to external impact. Plastic deformation
is likely to occur on the surface). This means a diaphragm that is easily damaged, and it is not
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excessive that makes handling in the manufacturing process difficult-plastic deformation of the
diaphragm surface reduces the rigidity of the diaphragm and the speaker characteristics (Th,
distortion) 3 degrades. For these reasons, the diaphragm surface must be sufficiently resistant to
external stress such as scratching and impact. In the past, in order to achieve these objects, it has
been necessary to increase the thickness of the aluminum surface material or use a thick material
of internal loss such as paper, plastic and the like. In the case of the former, however, the
efficiency of the speaker is completely lowered due to the increase in weight, and the latter has a
disadvantage such that a sufficient fh (high frequency band) can not be obtained because the
elastic modulus of the material is low. The present invention is intended to eliminate the abovementioned conventional drawbacks, and is intended to minimize deterioration of the speaker
characteristics and to increase the surface strength of the diaphragm. FIG. 1 shows a
conventional flat diaphragm.
In FIG. 1, 1 is a honeycomb core, and this honeycomb core 1 is formed by laminating a number
of aluminum foils with a thickness of 20 ?m and bonding the necessary caves between adjacent
aluminum foils. The outer diameter is 19 o? ?. 2 ? ииии No 7? ? is a surface material made of
aluminum foil (thickness 4 o?m) of circle ? 4 attached to the surface of the honeycomb core
1Q, and 30 ?m thick also on the back surface of the honeycomb core 1 The surface material
which consists of aluminum foil of is pasted. A coil bobbin is attached to the surface material of
this back surface. However, in the above-mentioned conventional diaphragm, since aluminum foil
having a small plastic deformation load is used as the surface material 2, the surface material is
scratched when external impact is applied, and the rigidity is lowered due to the plastic
deformation and the speaker characteristics There was a drawback that The present invention
eliminates all the disadvantages of the prior art, and an embodiment of the present invention will
be described below. Example 1 As shown in FIG. 2, an epoxy resin is coated on the surface of
aluminum foil 30 having a thickness of 20 ?m, and kraft pulp having a thickness of 60 ?m (TIS
coil insulation paper PI-2) 4 Using the surface material 6 dry-laminated with the adhesive 5C of
the system, the aluminum foil 3 side of the surface Ru F surface 146 is bonded to the surface of
the honeycomb core material 1.7. On the back surface of the honeycomb core 1, a surface finish
made of 5-aluminum foil (30 ?m in thickness) is attached. The koifure bobbin is attached to this
surface finish. The thickness of the adhesive 5 is 6 to 10 ?m. [Example 2] A glass fiber nonwoven fabric using a glass fiber non-woven fabric (fiber reinforced plastic) impregnated with a
phenolic resin in place of the kraft pulp 4 of Example 1 has a surface density of 16 t /?
Impregnate it with phenol resin with +1 '. It is made to be 60 f / l rI 'after curing. Next,
measurement methods and measurement results of the surface strengths of the diaphragms of
the conventional example and the example 1.2 will be described. Method of measuring the
surface strength of the diaphragm> The steel ball is moved horizontally at a constant speed (0,
51 / ec) in a state where the steel ball (diameter 211 al) is pressed against the diaphragm and
weight is vertically added. The surface strength is defined as the load at which plastic
deformation occurs that can be determined visually. The surface density of the above 40 ?m
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aluminum foil is 108 tlea. The surface material of this example is 10 (P / c + 4 and the surface
strength is large despite being slightly lighter than the conventional example). Improved.
The measurement result of the sound pressure same wave number characteristic of the speaker
unit (equivalent to 26 false woofers) using each of the above-mentioned diaphragms is shown in
FIG. In FIG. 3, + a + shows characteristics of the speaker using the diaphragm of the practical
example 1.2 and (bl and + c + respectively show 2 of the conventional example). As apparent
from FIG. 3, the fh of the conventional example 11 is 3, 3 KHz, while the fb of the example 1.2 is
3, 1 KHz, compared with the conventional example and the example 1, the example 1 , 2, fh is
reduced by only 200, L'H2. As described above, according to the present invention, it is possible
to almost deteriorate the speaker characteristics 7 and to improve the surface strength
significantly. In the above embodiment, a surface material in which an aluminum foil is attached
to one side of kraft pulp or fiber reinforced plastic is used. However, kraft pulp is used. A metal
such as aluminum may be vapor-deposited on one side of the fiber reinforced plastic to form a
gold crucible.
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