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JPS5168219

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DESCRIPTION JPS5168219
",, f (Ii Patent Office Secretary (3 others) 3), Patent applicant +1-Upper layer [phase] Japan Patent
Office ■ JP-A-51-682190 published Japan. (1976) 6, 12 持 49-14-1180 [Phase] filing day town;
(I 97 濠) / j, / / Office internal reference number 64-65! 5: A letter 1 of the present invention, a
dome-shaped diaphragm characterized in that a dome-shaped peripheral portion of the
diaphragm is formed so as to have rigidity relative to a portion of a pond.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a dome-shaped
diaphragm, and more particularly to a dome-shaped castor plate (excellent in removing distortion
and having excellent vibration characteristics in a high frequency region). 2. Description of the
Related Art Conventionally, a dome-shaped diaphragm has been used as a diaphragm that
performs approximate vibration to piston vibration. A loudspeaker using such a dome-shaped
diaphragm is constructed as shown in FIG. That is, a coil bobbin I provided with a voice coil 1131
is attached to the negative portion +13 of the dome-shaped diaphragm dυ so that the peripheral
flat portion (l にIt is configured to support. Then, when the moving plate llD drives the excitation
plate peripheral portion αa by the voice coil 13 via the coil bobbin a4, a large stress is
concentrated on the peripheral portion 12 of the moving plate m. In addition, since the vibration
mgt is molded into a simple shape, in order to make the peripheral portion α displacement
(piston movement @) by this stress, that is, in order to reproduce the body without distortion, the
dome shape vibration 411 The absolute stiffness of the perimeter of the plate is required. The
frequency band of the diaphragm used in the acoustic III unit is determined by the modulus E of
the diaphragm material mainly used and the value of Z / ρ which is the specific gravity to ratio.
And, a bullet due to E / ρ is remarkable in # high frequency region, and a material having a high
H / に お い て value is required to obtain uniform vibration characteristics in the high frequency
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region. Moreover, due to the disadvantage of 5IIh tolerance, it is required that the moving plate
itself has a small weight. Because of this, recently, a light alloy such as an alminium alloy or a
titanium alloy is used as a diaphragm and the value of K is calculated as EndPage: 1. Also, for
example, when it is desired to reproduce a band from middle to stuttering with a single speaker,
that is, in the case of a two-way speaker, the material used so far may be multiplexed in the
working frequency band There is a defect that causes vibration and degrades the sound quality.
Alternatively, even in the case of an am board for high acoustics, the reproduction of the steady
sound may be performed in the band of 20 KHz or less, but it is high for the reproduction of the
transient waveform (which corresponds to most of the musical tones). Since the frequency
component is included, a wide band characteristic is required. For this reason, a diaphragm made
of, for example, beryllium or the like has recently been adopted as an alloy with a larger l / β.
However, materials such as beryllium have the disadvantage that the materials themselves are
expensive and they are "friable" in that they are very difficult to process and disadvantageous in
cost.
Therefore, from the standpoint of acoustic diaphragm design, a material having a larger K / ρ
and a relatively easy mounting is desired. The present invention is considered to be the point as
described above, and by forming the diaphragm peripheral portion harder than the top of the
diaphragm, the distortion of the diaphragm peripheral portion is removed and the frequency
band is further extended. To provide a dome-shaped moving plate capable of Hereinafter, a
dome-shaped imaging plate according to the present invention will be described in detail with
reference to the drawings. That is, FIG. 2 is a schematic diagram of the dome-shaped diaphragm
according to the present invention, and the peripheral portion of the dome-shaped diaphragm is
formed to have a desired thickness in comparison with its top (2) K Do. As described above, since
the rigidity of this portion can be increased by thickening the internal pressure of the diaphragm
peripheral portion where the stress is concentrated by the voice coil glIh, it is possible to remove
the strain generated in any portion. And such a dome-shaped imaging board is manufactured as
follows. FIG. 3 is a schematic view of the apparatus for producing a dome-shaped diaphragm
according to the present invention. FIG. 3 has a predetermined thickness and size. On the inner
surface side of the metal base 0 ヒ ー タ having a dome shape, for example, the temperature
distribution when heating the heating means such as the heater @ is gradually higher toward the
dome peripheral portion from the top of the base In particular in the peripheral direction of the
substrate. Then, such an apparatus is disposed in the reaction vessel (d), for example, Bog 3 gas
is made to flow together with H 2 gas from the inlet (b) of the reaction tank (d), and the reaction
vessel (d) is charged. . After that, a chemical reaction B (boron) represented by the following
equation is deposited on the surface of the “substrate G” from K by heating the abovedescribed heater (d). 2BOlj, + 3H2 → 2B + 6H04 ° The deposition rate of boron by such a
chemical reaction is higher as the temperature is higher, so make sure to adjust the @ degree
distribution so that the peripheral part of the dome-like substrate 0 becomes particularly high K
Further, as shown by the broken line in FIG. 3, B becomes thicker in the peripheral portion of the
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dome-shaped substrate C31) than in the top portion. And by removing this substrate! 7 A domeshaped imaging plate as shown in FIG. 2 can be obtained. Next, a concrete example of a method
of manufacturing a diaphragm according to the present invention will be described in detail with
reference to FIG. · [Production example 1] A heater (d) of a substrate G having a dome shape of a
soft steel back having a predetermined size and shape is heated to a heater (d) at a temperature
distribution depending on the top of the base and the rim of the dome. And place it in the reactor
(d).
Bolj3 gas H from the suction port (b) in this reaction tank !! It flows with the gas to heat the
heater. And the temperature at the top of the dome is 90000, and the rim of the dome is 1050
'C! After reaction for 20 minutes by setting Ic, as shown by the broken line iJ3, the substrate on
which boron is precipitated is taken out from the reaction tank (mostly), and the substrate is
removed from the precipitated boron by dissolving the base with sulfuric acid. Do. In this way, a
dome-shaped moving plate as shown in 2A could be obtained. The top of the diaphragm was 50
m1, and the circumference was 80 m. By actually installing the dome-shaped imaging plate
manufactured by such a method as shown in FIG. 1, it was possible to obtain frequency
characteristics as shown in the characteristic diagram of FIG. Here, in FIG. 4, the time B is
manufactured by the same method and the same thickness by the same method as the
characteristic system, and the frequency characteristic of the 9th traveling plate is different. As
apparent from the EndPage: 2 characteristic, it can be seen that the diaphragm according to the
present invention can extend particularly a high frequency band compared to a diaphragm
manufactured to the same thickness. [Manufacturing Example 2] A heater f33 (d) is applied to
the inner surface side of the N1Jl dome-shaped basic 6 having a predetermined size and shape,
and the Al degree distribution is AlIn so that the dome circumference # becomes hot. Is placed in
the reaction vessel (1). Then, in this reaction [from 及 and in population IA, triclo-methylpyran
gas is caused to flow together with H 2 gas to cause the heater (4) to generate heat. Thus, after
making the tal hair at the top of the dome react for 15 minutes by setting the rim portion of the
dome at 900 ° C. to 1050 ° C., the precipitated Min group of <5 IC (boron carbide) shown by
the broken line in FIG. , * 3 sputum sprinkling, dissolve the substrate with nitric acid)-Remove the
substrate from the SiO deposited. Thus, a thick silicon carbide dome-shaped diaphragm with a
thick peripheral portion as shown in FIG. 2 can be obtained. The thickness of the top portion of
this thin plate was 30 μm 1 and the thickness of the peripheral portion was 75 μm. By actually
installing the dome-shaped diaphragm removed by this method as shown in FIG. 1, it is possible
to obtain the frequency a characteristic as shown by the characteristic curve 'of FIG. Further, the
characteristic B in FIG. 5 is the frequency a characteristic of a mobile plate made by the same
method and having the same thickness KJ II by the same method, and the thickness of the
peripheral portion of the diaphragm is made thicker by these characteristics It can be understood
that the 4IK high frequency a band can be extended by doing this.
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In the above embodiments, although the diaphragm has been described for boron and silicon
carbide, it can be manufactured by pyrolyzing a hydrocarbon gas such as methane gas and
depositing graphite. Further, the dome-shaped long moving plate according to the present
invention may be made of a conventional threat alloy such as aluminum alloy or titanium alloy,
or a high modulus, high strength, low specific gravity bowl-shaped composite material used as a
structural material, etc. It can also be manufactured as shown in FIG. That is, as shown in FIG. 6
(a) K ′ ′, for example, in the case of forming it with an abutment material, a dome-shaped
moving plate formed so as to uniformly align the fiber direction, and an IEs diagram (b The outer
diameter corresponding to the peripheral edge portion of the diaphragm of (a) as shown in b)) is
one-sided outer diameter (b). 6 (Q and 6) by attaching the vibration temporary placement of a
circle 4 shape corresponding to the inner diameter of the diaphragm peripheral portion of the
diaphragm to the peripheral surface of the diaphragm 6D shown in FIG. A dome-shaped
diaphragm can be obtained in which the thickness of the peripheral portion is increased as
shown in 2.). By increasing the elastic modulus in the circumferential direction of the dome
peripheral portion of the diaphragm by crossing the fiber direction of the thick portion further,
the strength can be increased to-. Further, among the composite materials used as a structural
material as in the above-described embodiment, the material can be deposited by a chemical
vapor deposition method such as boron, boron carbide, graphite or the like whose fibers have
high elastic modulus, high strength and low specific gravity. In particular, by manufacturing a
diaphragm formed so as to increase the thickness of the peripheral portion K, it is possible to
easily obtain a moving plate having a desired thickness. That is, in the chemical vapor deposition
method using these composite materials, since the chemical vapor deposition is a temperaturedependent chemical reaction, a diaphragm with a thickness of 4 is obtained by arbitrarily setting
the reaction source i or the temperature distribution. Can. Furthermore, by such a chemical vapor
deposition method, it is possible to form the boundary between the thick portion and the thick
portion of the diaphragm as a gentle change in thickness. Therefore, the thickness of the
retaining plate can be formed to be gradually changed from the diaphragm peripheral portion
where stress is particularly concentrated to the top portion where stress becomes smaller
gradually. By gently forming the boundary between the thick portion and the thick portion of the
diaphragm in this manner, a continuous distribution constant state is obtained with respect to
the vibration, and thus no extra distortion is generated. No more! r: As described above,
according to the present invention, it is possible to obtain a dome-shaped diaphragm in which the
dome peripheral portion of the diaphragm is formed to have rigidity compared to other portions.
As a result, it is possible to obtain a dome-shaped single moving plate capable of removing
distortion generated in the dome peripheral portion of the diaphragm and further extending the
frequency band.
4. Brief description of the drawings. FIG. 1 shows a conventional dome rest, an outline shown by
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@ surface for explaining a vibration state of peristalsis temporarily, a schematic-grooved drawing,
and FIG. 2 shows EndPage: 3 according to the present invention. Fig. 3 is a schematic view
showing a cross section of a dome-shaped moving plate according to the present invention; Fig. 3
is a schematic view showing an embodiment of a device for mounting a dome-like diaphragm
according to the present invention; Fig. 6 and Fig. M5 are frequency diagrams of the domeshaped imaging plate according to the present invention, and Fig. 6 is a diagram for explaining
another manufacturing method of the imaging plate according to the present invention. It is a
schematic block diagram of the imaging plate shown by the surface. 21, 61 · · · · · · · · · · domeshaped shooting plate 22 · · · · · · · · · shooting plate peripheral edge portion 23 · · · · · · · · · · · · · · · · ·
· · · · · dome-shaped shooting plate 22 · · · · · · · · shooting plate peripheral edge portion 23 · · · · · · ·
... 肴 1 figure 22 figure 'T 3 times (dBI + [渡 software (KHSI5, list of attached documents (1)
power of attorney one (2) specification one (3) drawing one (4) application copy 1 copy 6, the
above Other than inventor, patent applicant or agent (1) inventor co-location (12 agents
EndPage: 4
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