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Detail group 1, title of the invention Speaker diaphragm 1, a speaker characterized by forming a
speaker diaphragm by a structure in which a high rigidity material is deposited by plating on
carbon having a porous structure Vibration plate.
乙 Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm useful for producing a speaker having excellent sound reproduction characteristics. In
general, in a loudspeaker, in order to reproduce sound faithfully, it is desirable that the
diaphragm of the loudspeaker reciprocate over a wide frequency range. For this purpose, the
diaphragm is light (it is advantageous to use a hard material). That is, assuming that Young's
modulus is E and density is P, the larger the specific elastic modulus E / ρ represented by the
ratio, the better. Conventionally, for this purpose, a relatively light metal such as aluminum,
titanium, beryllium or the like has been used as a diaphragm material of a high sound range
speaker having a small diameter. However, it is necessary to have bending strength over a large
area for use in a large aperture low / mid range speaker. The thickness of the C1 diaphragm
must be increased, and the diaphragm is therefore required. The weight of itself increases.
Therefore, even the light metals mentioned above are not suitable as materials for large diameter
speakers. Therefore, in view of the strength against bending, that is, the relationship in which the
bending rigidity is in proportion to the term of the third power of the thickness, it is light (the
porous material of foamed synthetic resin of increasing thickness is used alone or as a core
material Is being developed. However, the diaphragm material according to this structure did not
reach a sufficient value in terms of strength. On the other hand, metal porous bodies, which are
high strength materials, are considered promising. However, since the specific gravity of the
metal itself is quite large, in order to use it as a diaphragm in practice, it is necessary to have a
porous structure having a high apparent porosity EndPage: 1 and a small apparent specific
gravity. It is currently obtained for nickel, iron, copper and their alloys as highly porous metal
porous materials. In addition, carbon is particularly excellent in terms of specific elastic modulus'
E / 比 as shown in the following table, and there is a method of mixing fibrous carbon into
ordinary pulp cone to increase specific elastic modulus B / ρ. It is generally done. アツベニウム
2. '7, 70 X i O' j 26 X 10 '□ titanium 4.6106 X 1023 X 10, carbon 1, 8216 x 10. 120 x 10' '.
However, carbon fibers are slippery, and in mixed papermaking, the ratio of carbon fibers is large
(even if the bonds between the fibers are poor, the carbon itself has a large specific elastic
modulus B / p). In general, 10 porous structure is advantageous to pulp, but carbon alone is
fragile, and it is practical to use as a diaphragm in terms of aging etc. There's a problem. In the
present invention, a carbon porous structure having high porosity, for example, a high rigidity
material such as nickel is deposited by plating on the surface of a ternary network structure to
form a carbon ternary network structure. The object of the present invention is to provide a
speaker diaphragm having an excellent sound reproduction characteristic by reinforcing the
body, but as disclosed in the publication, a desired metal material is electrodeposited on a
synthetic resin having continuous pores, The porosity of the ternary network can be controlled
by considering the porosity of the synthetic resin and the electrodeposition conditions.
FIG. 1 shows an enlarged sectional view of the structure. In the figure, (1) is a ternary networklike structure manufactured according to the above-mentioned manufacturing method, and the
structure (1) has a three-dimensional network-like structure and holes (2) are continuous. In the
present invention, as shown in FIG. 2, the j-type material (3) such as nickel is plated on the entire
surface of the carbon covering the pores (2) of the ternary network structure (1) as shown in FIG.
Apply a thin film (4) made of metal such as aluminum or synthetic resin, etc. through adhesive
substance (5) such as adhesive sheet or adhesive. It is stuck on Table 1 m of the ternary network
structure (1). In the same manner, the plating process can be performed by electrolytic plating
capable of depositing a plating layer of a high rigidity material (3) of a desired thickness by
controlling the applied current density, processing time, etc. Because it is not a metal, it can not
be applied directly to the carbon ternary network structure (1), so electroless plating and plating
that uniformly deposit a plated layer over the entire surface of the structure (1) are Consists of
two-step processing of An example of the present invention will be described below. After
degreasing and pre-plating treatment, a carbon ternary network (1) having a thickness of 'lrnvn
porosity 90% and molded in advance into a desired cone shape is soaked in a nickel electroless
plating solution bath for about 3 minutes to carry out nickel layer Is applied to the concave
structure (1), and then electrolytic plating is performed at a current density of 5 A / dm 'for
about 3 minutes to form a 50 μ thick nickel layer (3) on the carbon ternary network structure
(1). Let's grow. An aluminum foil (4) with a thickness of 2 DIL is attached to the ternary network
structure (1) thus formed as a sealing treatment with an epoxy adhesive (5) to obtain a speaker
diaphragm. . As is apparent from the above description, the diaphragm for a speaker of the
present invention has a highly rigid material deposited by plating on a porous carbon structure
having pores, which directly affects the characteristics of the speaker. The specific modulus of
elasticity as well as the bending stiffness are greatly increased. In addition, carbon has a problem
in aging despite the fact that EndPage: 2 specific elastic modulus is particularly excellent among
various diaphragm materials for speakers, and the characteristic has been sufficiently utilized in
the past, but this is not the case. The invention solves the problem by plating all over the surface.
Therefore, the speaker composed of this structure reproduces the sound faithfully over a wide
frequency band to obtain a reproduced sound with high sound quality. In addition, nickel plating
is easier to plate than other metal platings and has stable characteristics, and changes over time
(a great contribution to the present invention).
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a ternary network
structure, FIG. 2 is a cross-sectional view of a diaphragm for a speaker according to the present
invention, (1) is a ternary network structure, and (2) is Holes, (3) is a screen rigid material, (4) is
a thin film, and (5) is an adhesive material. Patent Assignee Sanyo Electric Co., Ltd.
Representative Ige Kei familiar, 1 evening · Figure 2 EndPage: 3
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