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JPS61107899

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DESCRIPTION JPS61107899
[0001]
TECHNICAL FIELD OF THE INVENTION The present invention relates to a method of
manufacturing a diaphragm of a speaker driven by supplying a signal current to a voice coil
inserted in a magnetic gap of a magnetic circuit. [Technical background of the invention and its
problems] As a diaphragm of a conventional speaker of this type, aluminum A 1. There is one in
which a metal such as copper Cus chrome Cr, a compound such as alumina Al2O, silicon oxide
SiO2, titanium carbide TiQ, titanium nitride TiN or the like is adhered by ion plating. However, in
the ion plating process, it is necessary to heat the base vibration plate substrate up to about 500
° C., and when the ion plating treatment is completed and returned to normal temperature, the
vibration plate substrate The diaphragm may be deformed due to the difference in thermal
expansion coefficient with the rating material. This deformation is manifested as a particularly
pronounced radial undulation 3 because the flanges 2 formed around the outer periphery of the
diaphragm 1 are flat, as shown in FIG. An edge is adhered to the flange portion 2 of the coneshaped diaphragm 1, but if such a wave 3 is present, adhesion to the edge can not be performed
well. Also, even if this bonding is possible, the wave 3 spreads to the edge, and the characteristic
of the edge is changed, so that the lowest resonance frequency fo of the spy force can not be set
as the target value. Furthermore, the dome-shaped diaphragm adheres the voice coil bobbin to
the neck portion, but in the same manner as described above, undulation occurs in this portion to
cause deformation or warping of the diaphragm, and it has a defect that it tends to be defective.
SUMMARY OF THE INVENTION The present invention is for removing the above-mentioned
drawbacks of the diaphragm by ion plating treatment, in which an annular liquid portion is
formed on the flange portion by concavities and convexities that are concentric with the outer
periphery. It is an object of the present invention to cut and remove the annular liquid portion to
form a flat flange portion after preventing occurrence of waviness of the flange portion.
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
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be described below with reference to FIGS. FIG. 1 shows a cone-shaped diaphragm base made of
titanium metal, and a flat flange 5 is provided around the outer periphery of the cone 4 and a
falling portion 6 is provided at the center of the cone 4. A flat inner flange 7 is integrally formed
at the lower end of the falling portion 6 in the center direction. The flange portion 5 is formed
with a 7-shaped annular liquid portion 8 concentric with the cone portion 4. However, the
annular liquid portion 8 is not limited to the above-described 7-shaped arc shape, step shape, etc.
Any shape may be used as long as it provides a large resistance to the formation of the wave 3 in
the figure.
Also, although the cone portion 4 is shown as a straight cone, this shape may be another shape
as long as it is used as a cone-shaped diaphragm such as a rose-curved cone. A central
positioning hole 9 is bored in the center of the inner flange portion 7. The diaphragm substrate
thus formed is raised to a temperature around 500 ° C., and a metal such as A /, Cu, Cr or the
like, or Alz03. Ion plating treatment of compounds such as SiO 2, TiC, TiN, etc. is performed to
form these metal or compound layers on the surface, and then returned to room temperature. At
this time, since the annular liquid portion 8 is provided in the flange portion 5, this serves as a
resistance to the generation of the waviness 3, so that the waviness 3 is not generated in the
flange portion 5 and a flat state is secured. . After the ion plate processing is completed and the
diaphragm is returned to normal temperature, the annular liquid portion 8 of the flange portion
5 is cut and removed by the press cutter 10 as shown in FIG. The press cutter 10 is composed of
an upper die 11 and a lower die 12 and the lower die 12 is a truncated cone shaped mold
conforming to the shape of the cone portion 4 and has a diameter d of the center positioning
hole 9 at its top The positioning table 13 with which the same size is fitted is provided, and the
outer periphery is a tooth portion except for the cutting dimension 12a of the flange portion 5.
The diaphragm is fitted downward to the lower mold 12 and the upper mold 11 is lowered to cut
and remove the annular liquid portion 8, and the length of the cut dimension 12 a remains as the
flange 5. Next, the inner flange portion 7 of this diaphragm is cut and removed by a second press
cutter 14 as shown in FIG. The press cutter 14 is composed of an upper die 15 and a lower die
16, and the lower die 16 is fitted with a truncated cone-shaped diaphragm receiver 17
conforming to the shape of the cone portion 4. The diaphragm receiver 17 is It is supported by a
coil spring 19 planted on a base 18. A centering table 20 having the same dimension as the
diameter d of the center positioning hole 9 whose tip is tapered at the top of the lower mold 16
is provided, and the center positioning hole 9 is fitted to this, and the diaphragm is Fit downward.
On the other hand, the inner diameter of the upper mold 15 and the outer diameter of the lower
mold 16 are formed to have the same dimensions as the falling portion 6 of the diaphragm, and
the stopper 21 is provided inside the upper mold 15. If this upper mold 15 is pressed down, the
inner flange portion 7 of the diaphragm is cut off and removed, and it becomes a straight falling
portion 6 for sticking the voice coil bobbin, and the molding process of the diaphragm is
completed. . In this embodiment, a method of manufacturing a cone-shaped diaphragm has been
described, but the diaphragm base material 22 is used as shown in FIGS. 4 and 5 also for a dome-
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shaped diaphragm and a cone-shaped diaphragm integrated with a center cap. In addition, if the
annular liquid portion 8 is formed in the flange portion 5, it can be manufactured in the same
manner as the above embodiment.
As described above, according to the present invention, since the annular wave portion is formed
on the planar flange portion formed on the outer periphery of the diaphragm, the diaphragm
base material is up to about 500'C in the ion plating process. Even if the temperature is raised
and returned to normal temperature after completion of the ion plating treatment, the annular
wave portion acts as a resistance to the occurrence of waviness, and the inner circumference of
the annular wave portion is kept flat. Then, since this annular wave portion is cut and removed in
the next step, the edge is attached, the flange portion to which the voice coil bobbin is attached is
kept flat, and the edge is not required to be corrected. Wearing and bonding of the voice coil
bobbin can be performed. Furthermore, according to the present invention, according to the
present invention, according to the present invention, the expected fO was not obtained due to
the change in stiffness due to the change of the effective width of the edge when the edge was
pasted in the presence of the undulation. Can be prevented in advance. Therefore, the present
invention can improve the quality and uniform the performance of this type of diaphragm. In
addition, since the deformation due to the ion break is suppressed, the outer dimensions of the
diaphragm become the dimensional accuracy of the pressing force and the tooth to be cut, and
the accuracy of the press cutter is usually 5/100 vsi, so the outer periphery It is possible to
improve the dimensional accuracy.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a cone-shaped diaphragm substrate according to an
embodiment of the present invention, FIG. 2 and FIG. 3 are cross-sectional views at the time of
cutting by a press cutter, and FIGS. FIG. 6 is a cross-sectional view of a diaphragm base when the
present invention is applied to a cone-shaped diaphragm integrated with a center cap, and FIG. 6
is a perspective view of a cone-shaped diaphragm subjected to the conventional ion plating
treatment.
4 ... cone part, 5 ... flange part, 8 ... annular wave part, lO ... press cutter, 11 ... upper mold, 12 ...
lower mold. Patent application applicant Pioneer Corporation-ll
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