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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for an electroacoustic transducer such as a speaker or a microphone, which is a kind
of acoustic equipment using a new material nylon film called a so-called nanocomposite recently
developed. It is.
2. Description of the Related Art The physical properties required for this type of electroacoustic
transducer diaphragm include a large specific elastic modulus, a suitable internal loss, a small
mechanical fatigue, and an excellent weather resistance. There is a point. In order to meet such
demands, materials such as various metals, ceramics, synthetic fibers, vegetable cellulose (wood,
non-wood pulp), carbon fibers, aramid fibers, synthetic resins have been proposed, and for highand medium-tone applications Materials have been appropriately selected according to the
purpose of use, purpose, price, manufacturability, etc., and processed and used using various
processing methods.
Among them, those using a synthetic resin have a relatively high specific elastic modulus and an
appropriate internal loss, and have small variations during mass production and relatively
excellent properties. It is widely used as a dexterous diaphragm.
In this case, in order to improve the mechanical properties (high elasticity, high internal loss) of
the organic polymer material, addition of inorganic substances such as calcium carbonate, talc,
carbon graphite, carbon fiber, glass fiber, mica etc. is generally performed. ing.
However, while these materials have very weak bonds with polymers and sufficient effects can
not be obtained unless they are blended in large amounts, on the other hand, the materials
become brittle by blending in large amounts. There are many problems such as an increase in
specific gravity and degradation of the mold at the time of molding, so it is difficult to increase
the addition amount beyond a certain level.
Further, there is also a method of performing a coupling treatment or the like to improve the
bonding strength between the inorganic substance and the resin, but the bonding is very weak
due to physical adsorption, and the effect can not be said to be sufficient.
In the case of resin film diaphragms widely used in tweeters and headphones, etc., it is often
difficult to add such a filler because of the relationship between the material thickness, specific
gravity and strength at the time of thinning. In the present situation, it is the current practice that
either general-purpose materials which are insufficient for the purpose or expensive and poor
engineering plastic films are used.
The present invention has been proposed in view of the above, and the object of the present
invention is for an electro-acoustic transducer having a high Young's modulus and a sufficient
internal loss while keeping the cost high, and having a well-balanced diaphragm. It is in providing
a diaphragm.
SUMMARY OF THE INVENTION The present invention relates to a film comprising a
nanocomposite nylon resin in which 0.5 to 10% of layered clay-like mineral is microdispersed at
the nanometer level in a nylon polymer. The above-described object is achieved by the structure
of thermoforming.
The clay mineral is any one of montmorillonite which is a layered silicate, synthetic mica,
savonite, hectorite and sepiolite.
BEST MODE FOR CARRYING OUT THE INVENTION Nanocomposites are ultrafine dispersion
systems in which the size of the dispersed phase is in the nanometer range, but those used in the
present invention are polymer nanocomposites, and nylon It is a composite material in which a
clay-like mineral is dispersed in the size of molecules (nano level) in a polymer, and nylon and
clay form an ionic bond.
The clay-like mineral is mainly composed of a layered silicate mineral, but in the present
invention, montmorillonite (smectoid group mineral), synthetic mica and the like are mainly used.
EXAMPLE The present invention provides a diaphragm made of a nanocomposite nylon film
material, wherein lamellar clay (montmorillonite) is microdispersed at the nanometer level in
nylon polymer as the diaphragm material, and the molecular level is obtained. By adopting a
nanocomposite nylon film with increased affinity to the matrix resin and appropriately molding
it, it is about 2 to 3 times as large as conventional products at general-level cost while having
almost the same specific gravity as general-purpose materials. A diaphragm for an
electroacoustic transducer having a rate and a sufficient internal loss was fabricated.
Montmorillonite is microdispersed 0.5 to 10% at the nanometer level with respect to nylon
Depending on the amount of montmorillonite added to the nylon polymer, the elastic modulus
and the strength are greatly improved.
In addition, the heat distortion temperature also rises.
The lower limit is set to 0.5% because the desired physical properties can not be obtained below
this. The reason why the upper limit is set to 10% is that if it is added more than this, the
formability of the material is significantly impaired.
In the present invention, a film of UBENYLONN NCH series 1022 CM 1/1022 C2 manufactured
by Ube Industries, Ltd. was used. Table 1 shows a comparison of the physical properties of these
nanocomposite nylon films and nylon films conventionally used.
The nanocomposite nylon (1022 CM1) film (thickness 100 μm) was heat-formed to form a dome
diaphragm of 20 mm Dia, and this diaphragm was incorporated to form a dome speaker. The
same diaphragm and speaker were produced using the conventional nylon film (100
micrometers in thickness) as a comparative example.
FIG. 1 is a graph showing the internal loss and Young's modulus of the above-mentioned
nanocomposite nylon (1022 CM1, 102 C2) film and the conventional nylon film etc., and it is
clear from these that the nanocomposite nylon film used in the present invention is It was
confirmed that a Young's modulus of about 2 to 3 times that of a conventional nylon film can be
obtained, and the internal loss is also sufficient, so that a diaphragm for a balanced electroacoustic transducer can be obtained.
FIG. 2 shows the frequency characteristics of the present invention and the conventional product,
and the thick line is that of the present invention, and the high frequency can be improved by the
speaker using the diaphragm of the present invention.
The diaphragm is not limited to a dome, and may be a cone. Moreover, it is also possible to apply
not only to a diaphragm but to a member such as a dustproof cap.
As described above, according to the present invention, the filler blending ratio to the nylon
polymer may be as small as 0.5 to 10%, so it is lightweight and has a Young's modulus of about 2
to 3 times that of the conventional product. Thus, it is possible to obtain a diaphragm having a
sufficient internal loss and improved high frequency characteristics. Moreover, since this
material is basically in the category of general purpose nylon materials, it is easy to obtain and
low in cost.
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