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Description 1, title of the invention
Speaker composite diaphragm
3. Detailed Description of the Invention The present invention relates to a composite diaphragm
for a speaker in which a boron layer is provided on the surface of a titanium foil, and the dense
layer strength of the titanium foil and the boron layer can be greatly increased. . The present
invention provides a composite diaphragm for beaker. It is said that it has good properties, good
processability, and a good internal loss and damping factor, but since these properties have
mutually contradictory elements, all of them can be made using conventional materials.
Satisfying is nearly impossible. Therefore, after processing titanium titanium foil which is
appropriately light weight, high elastic modulus and good in processability into the shape of
diaphragm, P, v% of boron layer B which has light weight and super high elastic modulus on its
surface Development of a diaphragm formed by the P method (physical vapor deposition
method) or the CVD method (chemical vapor deposition method) and combining the mechanical
properties of titanium Ti with the high elastic modulus of boron B There is. However, the solid
solution award between titanium Ti and boro 7B is small, and it is difficult to form a diffusion
layer at the interface, and a product that can practically be used as a diaphragm in terms of
adhesion between titanium foil and boron layer is hard to obtain t'L. . For this reason,
conventionally, treatments such as <1> to <3> shown below have been applied to measure the
adhesion strength, but it is difficult to obtain satisfactory dense layer properties in any method. I
boiled it. 1> treatment to clean the surface of titanium foil. EndPage: 1 <2>, force D% of titanium
foil during formation of boron layer. <3>, heat treatment for forming a diffusion layer of titanium
foil and a boron layer. The present invention is to provide a composite diaphragm for a speaker
with good adhesion without performing the processing as described in <1> to <3> above. The
basic configuration of the present invention will be described below with reference to the
drawings. In the figure, 1 is a titanium foil molded into the shape of a diaphragm, 2 is a low
melting point metal layer, and 3 is a boron layer. Next, the case where aluminum Al is used as the
low melting point metal 2 will be described. When the aluminum layer 2 is interposed between
the titanium foil 1 and the boron layer 3, the interface of titanium foil-boron layer becomes
titanium Ti-aluminum Al and aluminum AI-boron B. Therefore, at the interface of titanium Tiboron B, solid solution of boron B in titanium Ti PJ% U 750 ? ? C, 0, 05 wt% at ?1300 ░ C., 0,
1 w ? t% at 1670 ░ C. In the aluminum AIJ-boron B layer, the solid solution amount of boron B
in the aluminum Al is wt%. By providing the aluminum A1 layer in this manner, a large amount of
boron B forms a solid solution at a temperature lower than the interface of titanium Ti-boron B,
so that the adhesion strength is enhanced. The dense N strength of the steel has sufficient
adhesion strength as compared with the interface of aluminum Al-BoPon B as a result of
Incidentally, high adhesion strength can be stably obtained by heating the titanium Ti foil to 400
░ C. to 600 ░ C. when forming the aluminum AA layer and the boron B layer. Next, an
embodiment of the present invention will be described. In each of the examples, the adhesion
strength was compared between the case where the low melting point metal layer such as the
aluminum layer I was used and the case where it was not used. By using a low melting point
metal layer, it has an adhesion strength that can withstand practical use as a diaphragm material.
EXAMPLE 1 After forming and processing a 20 ?m thick titanium T1 foil, an aluminum Al layer
of about 1 ?m thickness is formed by vacuum evaporation on a sample etched for several
minutes with dilute hydrofluoric acid solution. Thereafter, a boron B layer having a thickness of
10 ?m is formed by an electric field evaporation method. EXAMPLE 2 In Example 1, the
titanium foil is heated to eoo'c during the formation of the boron B layer. [Example 3] After
forming an aluminum A "layer and boro 7B birds on a titanium foil in the same manner as
Example 1, heat treatment is carried out at a parent temperature of -1 ?r in an Ar atmosphere.
However, the sample which is not provided with the aluminum A1 layer is subjected to a heat
treatment of a5 ░ C.-3 ?r. In each of the above embodiments, although an example using
aluminum as the low melting point metal layer has been described, magnesium Mq or the like
may be used. 0 or the vibration of the above-mentioned [Example-1]-[Example-3] The adhesion
strength between the titanium foil and the boron layer of the plate is 4 to 5 times or more as
compared with the case where the aluminum layer is not provided. Etc. 1) According to the
present invention, the titanium foil and the boron layer have the advantage of greatly increasing
the strength of the metal foil.
4 is a cross-sectional view of a speaker forming diaphragm in one embodiment of the present
invention, a simple explanatory view of the drawings. 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и boron layer. Name of Agent Attorney Nakao / 1da 1-\
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