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Specification 1. Name of invention
Acoustic diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention is to provide a sound diaphragm
such as a speaker or a microphone and its' MfL method. Conventionally, as materials of
diaphragms such as speakers and microphones, 8 (, plastic, aluminum, titanium or the like has
been mainly used. However, these materials have low specific power and built-in fabrication of an
excellent diaphragm. In particular, in order to improve the characteristics of the high range, it is
necessary to form the diaphragm with a material having a large specific elastic modulus.
EndPage: 1 By the way, since the ribbon type speaker 7) 7 directly operates the voice unit 71j to
the diaphragm, it is necessary to reduce the DC resistance of the diaphragm and to reduce the
loss due to the resistance. In this case, to reduce the DC resistance, the cross-sectional area of the
diaphragm should be increased. However, if the cross-sectional area is increased, the quality of
the diaphragm 9: increases, the efficiency decreases, and the speaker characteristics deteriorate.
It will Therefore, in order to manufacture a diaphragm having a small negative part and a small
DC resistance, it is necessary to use a material having a small density and a specific electrical
resistance. Although aluminum has conventionally been generally used as a material of
diaphragms of ribbon type speakers, the density of aluminum is 2.7 f / (*, specific electric
resistance is 2.5 ??. On the other hand, since the density of 1 beryllium is i, ay / cd and specific
electric resistance is 2.8 ??m, when a diaphragm of ribbon type speaker having the same
negative value is manufactured, the beryllium is 1/1 of DC resistance. It can be sixteen. However,
beryllium is difficult to process, and a special rolling method or pressing method is required to
form it into a diaphragm. To thin beryllium, a plate rolled to a certain thickness is sanded with a
stainless steel plate, welded and sealed around, then heated to 800 ░ C or more and rolled
together with a stainless steel plate with a roll. Methods are taken. As a result, the cost of rolling
is high, and the size and thickness of the obtained plate are also limited. Further, in order to form
the thus-rolled auxiliary plate into a diaphragm by a press, a graphite press die is used, and the
die is heated to 800 ░ C. or higher while pressing it at 10 Torr or less. Therefore, the cost of the
press is increased, and the shape that can be pressed is also limited. In addition, in order to
perform press processing, it is required that the beryllium has high purity, and if the purity is
poor, the ductility becomes worse and it becomes impossible to form. In addition, although the
deposition method has been used to form beryllium in the near future, processing cost can be
reduced at first glance compared to mechanical processing methods such as pressing, but it is a
complicated process and an inexpensive device. After all, production frustration will be high after
In addition, the @ moving plate manufactured by vapor deposition is fragile and has low
mechanical strength, and it is difficult to manufacture a complex shape because of problems such
as the film thickness distribution of vapor deposition. The second invention of the present
application is made in view of the above-mentioned point, and the object of the second invention
is to heat-melt the setter beryllium or beryllium alloy by quenching, rolling small crystal grains
obtained by rolling and having high mechanical strength. It is an object of the present invention
to provide a highly sensitive old word diaphragm with high sound output and formed by using a
thin plate. Further, the object of the second invention of the present application is to form a thin
plate obtained by quenching and rolling by heating and heating a molten beryllium or beryllium
alloy by high-speed transfer body e such as a roll. It is an object of the present invention to
provide a method of manufacturing an acoustic diaphragm made of beryllium or beryllium alloy
which is obtained in a simple process at low cost and has small crystal grains and high
mechanical strength.
Acoustic diaphragm and method of manufacturing the same
Hereinafter, the present invention will be described in detail. FIG. 1 is a cross-sectional view
showing an example of an apparatus used to manufacture a thin plate formed on a diaphragm.
Among these, 1 is the entire device K. A heating container 2 is formed of a heat-resistant material
to heat and melt the material 3 of beryllium or Ba-IJIJ alloy which forms a diaphragm EndPage:
2. This heating container 2 is located on the upper side in the drawing. A gas inlet 2a is provided,
and a nozzle 2b is provided at the tip. A high frequency coil 4 is wound around the outer
periphery of the heating container 2 to heat the heating container 2. However, the means for
heating the heating container 2 is performed by passing a high frequency current through the
high frequency coil 4f, and heating is performed by an appropriate means such as using an
electric heater. A roll 5 is provided at the tip of the nozzle portion 2b of the heating container 4
so as to be rotatable at high speed. In order to manufacture a thin plate 3a made of beryllium or
beryllium alloy for forming a diaphragm using the above-described apparatus 1, first, the heating
container 2 is made to flow by passing 't' and 'vIt' through 'high frequency coil 4'. The material 3
of beryllium or beryllium alloy is melted. Then, after Hamura 3 is sufficiently melted, inert gas
such as high-pressure argon gas is introduced into heating vessel 2 from gas inlet 2a of heating
vessel 2, and material 3 such as beryllium melted by gas pressure is introduced. It is jetted onto
the surface of the rotating roll 50. The jetted material 3 is rapidly cooled on the surface of the
roll 50, and is pushed away by the centrifugal force of the roll 5 in the tangential direction e to
form a strip-like thin plate 3a. In this case, since the thin plate 3a is rapidly cooled by the roll 5
and the crystal grains are reassembled, it is flexible and has excellent ductility. Therefore, the
diaphragm P can be molded by pressing at normal temperature. Even when pressed at normal
temperature, its formability is better than that of thin sheet made by rolling method of rice. Also,
the vibrating plate is not fragile due to the flexibility of its leaf material, and is light and has a
high elastic modulus. Hereinafter, one embodiment of the above manufacturing method will be
described. Beryllium having a purity of 99% is used as the material 3 for producing a thin plate,
and the heating vessel 2 is heated to 1350 ░ C. by melting it through the high frequency coil 4
and melted. A high pressure gas at a pressure of 2 kg / i, for example argon as inert gas, is
introduced into the As described above, by introducing an inert gas into the heating container 2,
the molten material 3 is ejected onto the surface of an iron roll 50 with a diameter of 1? 500
rotating at 500 r, p, m. A thin plate 3a of 50 throats and 50 ?m in thickness is manufactured.
The Young's modulus of the thin plate 3 a thus obtained is 2.9 О 1 o N / ?, and has flexibility.
Next, this thin plate 3a was press-formed at a room temperature on a dome-shaped diaphragm
having a diameter of 25 ?m and a radius of 15 ?m of the spherical surface of the dome portion
as shown in FIG. What is shown in FIG. 2 is another device b) 1 used for the diaphragm shape of
the present invention. This apparatus ff 1 ? has substantially the same configuration as the
apparatus shown in FIG. 1 except that the quenching rolls 5 ? and 5 ? are rotatably provided
on the opposite side 0 tll below the nozzle portion 2 b of the heating container 2. The same parts
in the drawings are denoted by the same reference numerals. Then, the thin plate 3a is
manufactured using the above apparatus 1 'in the same operation as in the case of using the
apparatus neck shown in FIG. 1, except that the heating container 2 is heated to melt the material
3 2 by rolling the material 3 from the nozzle portion 2b between the rolls 5 'and 5' in the
direction of the arrow in FIG. 2 EndPage: 3-J-Le sj, 5 // Jl iron both sides 1 from the leg, from the
cold ? pressure ? i ni)) 4 ? ? thus obtained sheet is uniformly quenched from both sides by
both rolls 5 ', 5 ? 1 as shown in FIG. 1; there is no room for distortion to occur as compared with
the one manufactured in a. One example of the manufacturing method when the apparatus of
FIG. 2 is used) a1. Material 3 (This is a beryllium with a division degree of 99?, and the heating
vessel 2 is heated to 1350 ░ C. with a high jid wave coil 4 to melt the material 3 and then after
the pressure of N 2 Ky / cnf 2. Introductory material e This material 2000 is cast at 2000 r, pom,
and the raw material 3 is cast on 5 rolls (i 4), quenched, and rolled (crude lil 10 ?, 30 ?m II)
One belt of beryllium strip 3a. Next? The thin plate 3a here was press-formed at room
temperature to form an ion-type oscillating plate I as shown in FIG. This diaphragm had good
surface butterfly, was flexible and lightweight, and had high elasticity and modulus. ?
Furthermore, Fig. 1, ? 2 factor! ? The materials shown here are quenched and rolled by
blowing the material 3 melted together with the roll 5 or the roll 5 ', 5') f 411 'and the thin plate
is made by tM, but it is relatively fast.?? 44 ?, and squirting jJIJ um or pe 1JjJ um now gold on
the surface of an object with a cooling effect? Even if the sheet is rapidly cooled and rolled, the
thin plate 3a is finished!
???? Sound of the above-mentioned ? t ? ? first light! -'I Diaphragm (formed by using a
thin plate obtained by quenching and rolling by blowing heated or melted beryllium or beryllium
alloy to a relatively fast moving body such as a roll) Therefore, the grain size is small and the
mechanical strength is large, and the characteristics of high acoustic output and high sensitivity
IW are obtained. Father, book-1 1 second invention is to form a thin plate obtained by injecting
heated, melted beryllium or beryllium alloy to a high-speed moving body such as a roll,
quenching, and rolling No special rolling or pressing method is required, and it is possible to
easily make a Pii ? ? M-shaped beryllium diaphragm. 0
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing an example of an
apparatus for carrying out the present invention, FIG. 2 is a cross-sectional view showing another
example of the apparatus as well, and FIG. D-th type diaphragm? 4 is a perspective view showing
a ribbon greeting plate. 1.1 ? ииииииииииииииииииииииииииииииии 2 иии Gas introduction port, 2b иии Thin plate, 3 иии
Material, 3a иии Thin plate, 4 и ... High-frequency coil, 5; 5 ', 5 "... и и и Patent applicant Pioneer
Corporation EndPage: ?
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