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JPS6154797

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DESCRIPTION JPS6154797
[0001]
[Objective] (Industrial field of application) The present invention relates to a speaker diaphragm
that is most suitable for tweeters and squawkers in which the surface hardness of the diaphragm
is increased and the high frequency characteristics are improved. (Prior Art) Generally, various
methods are known as methods for increasing the rigidity of a diaphragm in order to improve
high frequency characteristics and sound quality of a speaker diaphragm, for example, aluminum
oxide on the surface of the diaphragm, By forming an aim of silicon carbide, silicon oxide, boron
carbide or the like, the rigidity of the diaphragm is totally improved. However, since the
conventional one described above is reinforced by a single inorganic material, there is a limit to
its strength and, of course, resonance can not be suppressed at the resonance point unique to the
above-mentioned inorganic material. , I could not expect significant improvement in sound
quality. (Problems to be Solved by the Invention) The present invention has been made in view of
the above-mentioned point, and its object is to obtain a high strength and be able to islandize the
transmission speed and to achieve resonance. It is an object of the present invention to provide a
speaker diaphragm which can be suppressed and in particular, excellent sound quality can be
obtained in a high region. (Means for Solving the Problem) First of all, in the loudspeaker
imaging plate according to the present invention, two hard layers of inorganic materials different
by an ion plating method are provided on at least one surface side of a titanium metal diaphragm
substrate. The first layer is a nitrided inorganic material layer or a mixed material layer of a
nitrided inorganic material and a carbonized inorganic material, and the second layer is an
oxidized inorganic material layer. Second, a hardened layer of two different inorganic e materials
was formed by an ion plating method on at least one surface side of the titanium metal
diaphragm surface. And one of the first and second layers is a desired inorganic a layer or a
mixed material layer of a nitrided inorganic material and a carbonized inorganic material, and the
other layer is a nitrided inorganic material and a carbonized inorganic material And a mixed
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phase layer of In the second one, there is included one in which the inorganic material nitrided
with t- is titanium nitride and the carbonized inorganic material is titanium carbide. Embodiment
An embodiment of a speaker diaphragm according to the present invention will be described
based on the drawings. In the figure, 1 represents the whole of the speaker swing plate, 2 is a
titanium metal diaphragm substrate as the substrate, 3t'1 a hard layer formed on the surface of
the titanium metal vibrational deposition substrate 20 by the ion plating method It is formed of
the foreign inorganic material layers 4 and 5 of 9.2 layers. The above inorganic '31 May 4, 50
combination is roughly classified into 2a [class. First, in the first configuration example, the first
layer (4) is a nitrided inorganic material layer or a mixed material layer of a nitrided inorganic
material and a carbonized inorganic material, and the second layer (5) is an oxidized inorganic
material layer. It is
In the second configuration example, one of the first layer (4) and the second layer (5) (for
example, the first layer (4) is a nitride inorganic material layer or a mixture of a nitride inorganic
material and a carbonized inorganic material) The other layer (for example, the second layer (5))
is a mixture layer of a nitrided inorganic material and a carbonized inorganic material. Various
materials such as silicon carbide and boron carbide can be used as the inorganic material, but in
the second configuration example, in particular, titanium nitride is used as the inorganic nitride
material and titanium carbide is used as the inorganic nitride material. Can be significantly
improved. The characteristics of the diaphragm l configured as described above will be described
in detail below. First, in the first configuration example, a titanium nitride layer is formed on both
sides of a 20 μm titanium metal diaphragm, and then an aluminum oxide layer is formed on only
one side. The vibration propagation speed reaches 6000 to 8000 (m / 5 ec) in the formed field
attachment, but only about 5000 to 6000 (m / sac) in the case where the second aluminum oxide
layer is not formed. Moreover, in this embodiment, since the first M (4) is formed of a conductive
layer such as titanium nitride (or titanium carbide), an insulating inorganic layer (aluminum oxide
(AttOs) is ion-prevented to the second N (5). It becomes easy to form by the coating method, and
mass productivity can be improved. On the other hand, in the second configuration example, the
hard layer 3 in which the first layer 4 is a titanium nitride layer and the second N 5 is a mixed
layer of titanium nitride and titanium carbide is formed on both sides of a 20 μm titanium
diaphragm substrate. The imaging motion propagation velocity is 116500 to 8500 (m / see), but
it is only 5000 to 6000 (m / 5ec) in the case where the second J 藷 5't- is not formed. Further, in
this embodiment, since both the first layer 4 and the second layer 5 are conductive layers, the
productivity can be improved similarly to the first structural example. In addition, since the
titanium nitride layer has a gold-like color, it can be elegantly designed. In the above-mentioned
@ 1 and second cultivation examples, hard layers can be provided on both sides of the titanium
metal diaphragm as shown in FIG. 1 or only on one side as shown in FIG. Of course, it is also
optional to make the material different between the front side and the back side. Furthermore, as
a shape of a diaphragm, it can form arbitrarily, such as a dome shape and a cone shape, and
utilization as a chamber is also possible. (Effects of the Invention) According to the speaker
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diaphragm of the present invention, the hard layer of two different inorganic materials is formed
on at least one surface side of the titanium metal diaphragm base by the ion shifting method. The
hardness of the surface of the diaphragm can be significantly improved, and the speed of
vibration propagation can be increased.
Therefore, it is possible to appropriately suppress the occurrence of the response reduction and
the divided vibration in the high region, and the sound J: JL can be greatly improved.
Furthermore, since the hard layer is formed of two layers, the resonance inherent in each layer is
canceled to suppress the resonance. Distortion due to resonance is reduced.
[0002]
Brief description of the drawings
[0003]
The drawing shows an embodiment of the speaker diaphragm according to the present invention,
and FIG. 1 shows that both sides of the diaphragm are hard 'f!
FIG. 2 is a cross-sectional view showing an example in which a hardened layer is formed only on
one side of a diaphragm.
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