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Title of invention
Speaker diaphragm
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm having a high vibration propagation speed, and more particularly to a cone
diaphragm. In the cone type speaker, it is required that the density が be as small as possible,
that the Young's modulus E be as large as possible, and the internal loss R be appropriately large
as the vibration plate material for the speaker. In the dome type speaker, it is required that the
density ρ be as small as possible and that the Young's modulus E be as large as possible, and as
a result, it is desirable that the vibration transmission accuracy is large. However, it is extremely
difficult to obtain these requirements with a single fiber in the diaphragm of a cone-type speaker,
and conventionally mixing the godlike brain stakes with 1. Efforts have been made to produce a
diaphragm that is as close to ideal as possible. And depending on the type of fiber, even if there is
a slight difference in its physical properties, there is nothing that has extremely high 1 Young's
modulus E and a small property t of density EndPage: 1β. A diaphragm in which alumina fibers
and the like are mixed and formed with conventional fibers has come to be manufactured. On the
other hand, a diaphragm made by mixing these metal fibers such as carbon fiber and alumina
fiber has poor entanglement with the other conventional fiber to be mixed, and when these metal
fibers are mixed in large amounts, the diaphragm is rather vibrating. The problem is that the
strength of the product decreases, which causes problems in production control, such as the
proportion of the mixing amount and the need for skill in mixing. On the other hand, in horn-type
speakers or dome-type speakers, in order to obtain the above-mentioned ideal physical
properties, metallic materials consisting of a single element such as beryllium Be or titanium Ti
or an alloy thereof have come to be used for diaphragms. However, these are inner side in
manufacture due to the properties of the material (especially hardness and viscosity) K, and there
is a drawback that the cost is very high. The present invention has been made in view of these
conventional drawbacks, and its main object is to provide a speaker having high rigidity, low
specific gravity, and appropriate internal loss, and another object of the present invention is easy
to manufacture. In addition, the cost is low and the quality is uniform. Hereinafter, the main base
material constituting the main part of the present invention will be described with reference to
FIGS. 1 and 2 according to a drawing based on an embodiment to which the present invention is
applied. In these figures, 1 is a so-called non-metallic substance such as natural fibers consisting
of plant fibers and animal fibers, artificial fibers consisting of synthetic fibers and inorganic
fibers, plastics fibers, etc. It is a seed hair fiber which is a kind of a plant fiber generally having a
hollow shape that is generally very wide and has an egg-shaped cut with a length of 8 to 32 rrmz
and a width of 30 to 35 μ, as shown in FIG.
2) A metal substance adhered to the surface of the main substrate l, and a single substance or an
alloy thereof having a large ratio of Young's modulus E to density rho (hereinafter referred to as
"stiffness 1 V rho") in its physical properties The substance is a metal substance such as
beryllium Bes alumina, and their alloys. Here, the method of attaching the large metallic
substance 2 having a relatively high stiffness (FV)) to the main substrate 1 is also to uniformly
form the metallic substance 2 to be attached uniformly in order not to change the physical
property of the attached metallic substance 2. It is also preferable to carry out by a vacuum
plating technique (for example, a vacuum evaporation method, an ion plating method, etc.). That
is, a specific example of the manufacturing method is shown in the following. The substrate is
placed in a vacuum in the form of a main substrate "tm", and the metal substance 2 is deposited
on the main substrate 1 by ion plating. Measure the main substrate 1 in a vacuum and attach the
metal substance 2 to the surface of the main substrate l while supplying the main substrate l to
the lapped part (face) little by little by the observation method It is produced by forming. In this
case, the former ion plating method is efficient, and a physically stable and excellent coating
spread can be obtained. In addition, in ion plating method, the mean free path of vapor
deposition particles is short. Because it is very flexible, not only the surface of the main substrate
l in a linear (straight) relationship from the evaporation source of the metal substance 2, but also
the main substrate 1 is in an overlapping state. Even if it is possible to attach it, it is possible to
cover the entire outer surface of the main substrate as shown in FIG. 2 with the metal substance
2 and physically adhere the deposited film. It has a number of advantages such as high strength
and high strength of the deposited film itself. Here, the shape of the main substrate l need not
necessarily be hollow like the kapok shown in the examples, and the surface of the main
substrate l to which the metal substance 2 is attached is As shown in FIG. 2, it may be the entire
outer surface of the main substrate 1, or may be a part of the outer surface of the main substrate
1 as deposited by a vacuum deposition method, etc. In the main substrate 1 having a shape, the
hollow surface (inner surface) may be used. Furthermore, a metal substance 2 deposited and
formed on the surface of the main base material by vacuum plating technology is preferably a
substance having a relatively large physical property Vp), and the V substance of the metal
substance 2 and the adhesion thereof The EndPage: 2 thickness of the film may be arbitrarily
selected according to the speaker diaphragm having various purposes, that is, desired physical
Here, according to the inventor's experimental report, the metallic substance 2 has an extremely
large effect when the relative stiffness Vρ of the metallic substance 2 is 1.0 × 10 9 (in) or more
(for example, beryllium Bex alumina, titanium Ti 1 and its alloy, etc.) , And also its relative
stiffness V05 is 05-1. OX10 '(in) metal material (eg, nickel Nis beryllium kappa BeCu, copper Cu-,
and alloys thereof) has a relatively large color effect, and its relative stiffness Vρ is not more
than 05 × 10 9 (in) Metal materials (eg tantalum Ta). It has been confirmed that even carbon C1
tin Sns lead Pb1 and its alloy etc. have a great effect. In this manner, the metal substance 2 is
deposited and a main substrate is obtained. Here, as a matter of course, in the speaker diaphragm
according to the present invention, in the manufacturing process, the main base material 1 on
which the metal substance 2 is attached and formed, the metal substance 2 attached to the above
theory 1 and It may be mixed with another substrate on which different metal substances are
deposited and formed. The speaker diaphragm according to the present invention can be applied
not only to a cone type speaker diaphragm and plate but also to a horn type speaker #i moving
plate and a dome type speaker diaphragm and plate.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main substrate in
the longitudinal direction, and FIG. 2 is the diameter of the main substrate. The sectional view of
the direction is shown, respectively. 1 · · · Main base material, 2 · · · · Metal @ 實,-廚 出 廚 生 パ イ
オ ニ ア 式 会 株式会社 73-1−1EndPage: 3
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