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JPS58161497

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DESCRIPTION JPS58161497
[0001]
The present invention relates to a speaker diaphragm and a method of manufacturing the same,
and a first object of the present invention is to realize a core material made of a material having a
low density and a high specific elastic modulus such as boron or nickel +7. An object of the
present invention is to provide a lightweight and high-performance speaker diaphragm. The
second object is to provide a method of manufacturing a speaker diaphragm in which low
density, high specific modulus material, boron or beryllium can be formed as a core material
without affecting its machinability. . In general, the speaker diaphragm can follow the driving
force given by the electromagnetic conversion system within its working frequency band with
sufficient linearity and vibrate on the entire surface in the same phase (piston vibration). It is
considered an ideal. Moreover, the radiation surface was made flat from the surface of the sound
radiation characteristic. A so-called flat diaphragm is considered ideal. In this flat diaphragm, in
order to prevent split resonance and widen the piston vibration area, the rigidity due to the shape
effect in the cone type or dome type is determined for the thickness of the diaphragm. As a
result, the diaphragm weight increases and the efficiency of the speaker The problem was that
the As a method of improving this defect, a diaphragm made of a sandwich structure in which a
skin material is adhered to the surface of a core material which is sharper than a hollow core has
been put to practical use. No effect was obtained. Therefore, attempts have been made to reduce
the weight by thinning the material constituting the sand-inch structure in order to further
increase the effect, but if the material is made thinner, the mechanical strength decreases, and
buckling, deformation or the like during assembly There has been a problem that partial
resonance (surface noise phenomenon) occurs during operation and the acoustic characteristics
deteriorate. O A material with low density and high elastic modulus is desired to improve the
weight defect of such a plane diaphragm. Boron and beryllium are known as materials that meet
these requirements. However, boron and beryllium are difficult to machine into complicated
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shapes because of poor machinability such as rolling and forming. On the other hand, even if
processing techniques such as vapor deposition and hot pressing in an inert atmosphere are
used, their application range is limited, and aluminum and titanium are mainly used as general
structural materials for acoustic transducers. The Also, in the diaphragm of the sandwich
structure as described above, the balance of the material properties of the skin material and the
core material is also important. For example, when the core material of aluminum is combined
with a skin material such as beryllium or boron, aluminum or Compared with the case where
titanium was used, the characteristic contribution rate of material physical properties became
low, and it was difficult to fully utilize the physical properties of the skin material.
Honeycombs and ribbon braided materials have been put to practical use as core materials
consisting of the hollow core of the speaker diaphragm made of sandwich structure, but in the
case of honeycomb materials, cells are partially doubled. Therefore, the degree of weight
reduction is low, while in the case of a ribbon braided material, in order to bend long ribbons
with a small diameter, machinability is required for the material, the braiding process becomes
complicated, and the productivity deteriorates. Had disadvantages such as. The present invention
solves such conventional drawbacks, and a plurality of core units in the form of hairpin-shaped
and formed single films of beryllium or boron are radially arranged to form a hollow core
material, which is formed on the surface of this core material. A skin material made of beryllium
or boron is to be bonded. Then, the core material is previously cut into a desired thickness of a
laminated material block in which a film of beryllium or boron is formed by vapor deposition on
the surface of a substrate whose cross-sectional shape is shaped like a hairpin. Are separated to
form a core unit made of a single film of beryllium or boron, and thereafter, a plurality of the
above-mentioned core units are arranged radially. According to this configuration, since the core
material is a plurality of hairpin-shaped simple-shaped core units arranged radially, the core unit
itself is formed of a single film of boron or beryllium formed by the vapor phase growth method.
It is possible to apply a low density and high specific modulus material, such as boron and iron IJ
I, to the core material without any influence of poor machinability. Therefore, it is possible to
realize a core material made of a material having a low density and a high specific elastic
modulus such as boron or beryllium, and to provide a lightweight and high-performance
loudspeaker diaphragm. Here, the core material to be the gist of the present invention is based
on the basic principle of the shape having an isotropic distribution density in which the ribs are
arranged radially from the center of the diaphragm, and its machinability is poor. Of the core unit
formed by the vapor phase growth method, and the three-dimensional hairpin shape such as Ushaped two trapezoidal shape to further enhance the productivity at the time of assembly and
adhesion, against torsional stress I am improving the strength. Hereinafter, the speaker
diaphragm of the present invention will be described with reference to the drawings of the
embodiments. 1 and 2 show an embodiment of the present invention, in which 21 is a core
material having a plurality of core units 22 arranged substantially in the shape of the letter U and
formed of a single film of boron formed radially. Reference numeral 23 denotes a skin material
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formed of a generated single film of boron bonded by thermo-compression bonding to both
surfaces of the core material 21 with an adhesive.
Specifically, as shown in FIG. 3, the skin material 23 was prepared by electron beam evaporation
by placing the titanium substrate 11 covered with the mask material 12 in the DC ion plating
apparatus 13. As shown in FIG. 4, the DC ion plating apparatus 13 arranges the substrate 2 and
the crucible 4 opposite to each other in the per jar 1 having an exhaust system, and in the
vicinity of the crucible 4, the thermionic electron accelerating electrode 3 and the electron beam
gun 6 The thermal electron accelerating power source 6 of the thermal electron accelerating
electrode 3 and the ion accelerating power source 7 as a power source of the substrate 2 are
provided. Then, Ruth and pot 4 were charged with boron 8 as an evaporation source. At this time,
boron is evaporated in an atmosphere of 1 to 3 О 10? ? ? Torr, n 70 V is applied to the
thermion accelerating electrode 3, and the thermions generated from the crucible 4 are
accelerated to collide with the evaporated particles of boron. , Ionized boron. Also, during boron
formation, a voltage of ? osxv is applied to the substrate 2 for 2 minutes from the initial stage of
generation, and then lowered to 01 Kv for 20 minutes to form a boron layer 14 with a thickness
of 157 tm on the substrate 2 The A 30 to 60 [mu] m thick titanium foil was used as the substrate
2 and the surface was covered with a mask material 12 having a hole of 28 square diameter to
form a boron layer 14 of a desired size. Then, after the formation of the boron layer 14, the
titanium substrate 11 was chemically dissolved and removed with a hydrofluoric acid solution
having a concentration of 06 to 10% to form a skin material stronger than a single film of boron.
On the other hand, as shown in FIG. 3, in the core unit 22 constituting the core material 21, the
core jig 16 having a trapezoidal cross section is inserted into a titanium substrate 16 having a
thickness of 30 .mu. A mask material 18 was provided at the end of the titanium substrate 16
and placed in the DC ion plating apparatus 13 and generated by the electron beam evaporation
method while being rotated about the rotation axis 17 provided in the core jig 16. Then, a
laminated material block 2o in which a boron layer 19 having a thickness of 20 ?m was formed
on the titanium substrate 16 was cut with a width of 9 WaK'tJj 'by a laser cutter. After that, the
titanium substrate 15'i is chemically dissolved and removed in a hydrofluoric acid solution with a
concentration of 06 to 10%, and a length of 135 mm, a width of 115 mm, and a height Q99. A
boron core unit 22 having a thickness of 20 ?m was obtained. The plurality of core units 22
described above are arranged radially in an array 9 ии ? ? to form the core 21. At this time, in
order to form a boron layer for the core unit 22, the substrate is not rotated in an atmosphere of
1 to 3 О 10 ?5 Torr by an electron beam evaporation method using a DC ion plating apparatus
as in the skin material. Then, the boron was evaporated, and 70 V was applied to the thermion
accelerating electrode 3 to accelerate the thermoelectrons generated from the crucible 4 to
collide with the evaporated particles of boron to ionize the boron.
During the boron formation, a voltage of C5) O 5 KV is applied to the substrate 2 for 2 minutes
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from the initial stage of generation, and thereafter lowered to QlKv for 20 minutes to form a 20
?m-thick boron layer on the substrate 2 The After that, a flat boron skin material 23 with a
thickness of 15 ?m coated with an adhesive on both sides of the core material 21 is
thermocompression bonded at a temperature of 200 to 230 ░ C. and a pressure of 1 to 2 kg /
17. rIrIR. A flat diaphragm with a thickness of 1 was obtained. The total weight of this diaphragm
was 886 and the primary resonance frequency was 264 KHz. Comparative Example 1 A pure
boron skin material having a thickness of 15 .mu.m was heated at a temperature of 2oo to
230.degree. C. on both sides of a core consisting of a hollow core formed by hollowing an
aluminum ribbon having a thickness of 20 .mu.m in a chrysanthemum shape.
Thermocompression bonding under conditions of a pressure of 1 to 2 kg / cfIi, and a diameter of
28 m. A flat diaphragm about 1 cabinet thick was produced. The total weight of this diaphragm
was 119 and the primary resonance frequency was 132 KHz. Comparative Example 2 A 20 ?m
thick aluminum skin on both sides of a core consisting of a hollow core in which an aluminum
ribbon of 2071 m in thickness and 09 mm in height is knitted in a chrysanthemum shape;
temperature of 200 to 230 ░ C., pressure of 1 to 2 KIi / CF7f Then, the flat diaphragm having a
diameter of 28 cylinders and a thickness of about 1 m was produced. The total weight of this
diaphragm was 142 and the primary resonance frequency was 123 KHz. In the above
description, although a single film of boron was used as a skin material, it may be a single film of
silver IJ IJium, and the laminate may be left without separating the titanium substrate. It can not
be said that it can be used as As described above, according to the present invention, the physical
properties of the skin material can be fully utilized to achieve a significant improvement in the
resonance frequency, and weight reduction can be achieved by making use of the features of the
structure and the materials used. It is possible to provide a high-quality speaker having the
characteristics of high reproduction, wide reproduction band and high efficiency. In addition, the
core material is formed by separating the substrate from the formed film formed on the surface
of the molded substrate by vapor phase growth to form a core unit, and this core unit is
constituted by collecting the core unit. It has the advantage that materials such as boron and
beryllium can be applied without machining (bending).
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway plan view showing an embodiment of a sliding plate for a speaker
according to the present invention, FIG. 1 is a sectional view of the same diaphragm, and FIG. 3 is
an explanatory view of a manufacturing process of the same diaphragm, FIG. 4 is a schematic
view of a DC ion plating apparatus used to make the skin and core of the diaphragm.
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DESCRIPTION OF SYMBOLS 1 ......... Fist Pell jar, 2 иииииииииииииииии Thermionic accelerating electrode, 4
ииииииииииииииииииииииииииииииииииииииииииииииии Electron gun ----- heat electron accelerating power supply, 7 ...... ion
acceleration power supply, 11.15 ...... titanium substrate, 12, '18 @ammas mask material, 14, 19 @ - @ - и Boron film, 2 o и и и и и и и и и laminated material block, 21 и 1 и и и core material, 22 и и и и и core
unit, 23 и eO ░ skin material.
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