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JP2012151707

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DESCRIPTION JP2012151707
PROBLEM TO BE SOLVED: To provide a method for manufacturing a dynamic microphone unit
capable of suppressing the occurrence of defective products and improving the yield. SOLUTION:
A step of fixing a voice coil 9 to a diaphragm 8, a step of arranging a ring yoke 5 in a jig 12
provided with a cylindrical spacer 11 made of a thin plate, and a periphery of the arranged ring
yoke 5. Applying an adhesive to the part, inserting the voice coil 9 on the inner peripheral side of
the spacer 11 and placing the vibrating part 10 on the ring yoke 5 in a state where the adhesive
is not cured, and an adhesive A method of manufacturing a dynamic microphone unit,
comprising the steps of: curing the vibrator 10 and fixing the vibrating portion 10 to the ring
yoke 5; and taking out the ring yoke 5 to which the vibrating portion 10 is fixed from a jig and
incorporating it into the magnetic circuit 20. [Selected figure] Figure 1
Method of manufacturing dynamic microphone unit
[0001]
The present invention relates to a method of manufacturing a dynamic microphone unit which
can suppress the occurrence of defective products and improve the yield.
[0002]
As a basic configuration, as described in Patent Document 1, the dynamic microphone includes a
dynamic microphone unit having a vibration unit that receives and vibrates a sound wave, and a
magnetic circuit.
[0003]
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The vibration unit has a diaphragm and a voice coil (power generation coil).
The diaphragm is a diaphragm-like member having a center dome and a sub dome continuously
provided around the center dome, and the voice coil is attached to the boundary between the
center dome and the sub dome by an adhesive or the like.
[0004]
The magnetic circuit includes a permanent magnet, a pole piece provided on one pole side of the
permanent magnet, and a ring yoke magnetically coupled to the other pole side of the permanent
magnet via a yoke, A voice coil is vibratably supported via a diaphragm in a magnetic gap formed
between the ring yoke and the ring yoke.
[0005]
A conventional example of a method of manufacturing such a dynamic microphone unit will be
described with reference to FIG. 4 and FIG.
[0006]
First, as shown in FIG. 4, the permanent magnet 2, the pole piece 3 and the yoke 4 are
assembled.
Then, as shown in FIG. 5, the ring yoke 5 is attached to the yoke 4 by an adhesive.
Here, in order to prevent eccentricity of the ring yoke 5 and the pole piece 3 and obtain an
appropriate dimension of the gap 7, as shown in FIG. It is inserted between the pole pieces 3 and
curing of the adhesive takes place.
[0007]
The ring yoke 5 has a peripheral wall at the upper end in FIGS. 4 and 5, and the outer peripheral
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edge portion of the diaphragm 8 constituting the vibrating portion is adhered to a step portion
provided on the inner surface side of the peripheral wall. Be done.
In addition, the voice coil 9 which constitutes the above-mentioned vibrating portion together
with the diaphragm 8 is disposed in the magnetic gap 7 so as to be separated from the ring yoke
5 and the pole piece 3.
[0008]
Japanese Patent Application Laid-Open No. 05-064282
[0009]
According to the above-described conventional method of manufacturing a dynamic microphone
unit, even if the gap 7 between the ring yoke 5 and the pole piece 3 is properly secured, the
voice coil becomes a ring yoke or pole due to the eccentricity of the diaphragm or voice coil. May
come in contact with
In addition, since the magnetic circuit is assembled first, dust may adhere to the gap portion.
[0010]
In such a state, the vibrating portion can not vibrate normally, and as shown in FIG. 6, the
frequency characteristic is degraded. In particular, in the case of using a thin diaphragm 8 having
a thickness of 9 μm, for example, in order to obtain good frequency characteristics in the low
frequency range, the outer diameter tends to be eccentric because the diaphragm 8 is thin and
soft. When such a diaphragm 8 is used for a magnetic circuit having a gap 7 of, for example, 0.4
mm, the possibility of the voice coil 9 coming into contact with the ring yoke 5 or the pole 3
becomes high.
[0011]
Further, as shown in FIG. 4, the resin spacer 6 used when assembling the magnetic circuit 20
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may be worn due to repeated use, and there may be a residue of scraped resin. Then, the residue
remains in the gap 7 as a foreign substance, causing a problem of generation of a defective
product.
[0012]
As described above, since various problems occur in the conventional manufacturing method, the
yield is low, and many defective products may be generated.
[0013]
The present invention has been made in view of the above problems, and a voice coil is attached
to a ring yoke by bonding a diaphragm to the ring yoke using a jig having a spacer that
appropriately separates the voice coil from the ring yoke. An object of the present invention is to
provide a method of manufacturing a dynamic microphone unit that can prevent contact with a
ring yoke or a pole piece and foreign matter remaining on a spacer, and can suppress the
occurrence of defective products.
[0014]
In the present invention, a vibrating portion having a diaphragm and a voice coil, a permanent
magnet, a pole piece provided on one pole side of the permanent magnet, and the other pole side
of the permanent magnet are magnetically connected via a yoke. And a magnetic circuit having a
ring-shaped ring yoke, wherein the voice coil is vibratably supported via a diaphragm in a
magnetic gap formed between the pole piece and the ring yoke. In the method, a ring is formed
so that the inner peripheral surface of the ring yoke is along the outer peripheral surface of the
spacer in the vibrator assembly step of fixing the voice coil to the diaphragm and the jig provided
with the cylindrical spacer made of thin plate. In the step of disposing the yoke, the step of
applying the adhesive on the periphery of the disposed ring yoke, and in the uncured state of the
applied adhesive, A mounting step of inserting the coil on the inner peripheral side of the spacer
and mounting the vibrating portion on the ring yoke; a fixing step of curing the adhesive and
fixing the vibrating portion to the ring yoke after the mounting step; And a step of incorporating
the ring yoke, to which the vibrating portion is fixed, from the jig and incorporating it into the
magnetic circuit, and providing the method of manufacturing the dynamic microphone unit.
[0015]
According to the present invention, the diaphragm is bonded to the ring yoke by using a jig
having a spacer which appropriately separates the voice coil from the ring yoke, whereby the
voice coil contacts the ring yoke or pole piece, the spacer Residues of foreign matter can be
prevented, generation of defective products can be suppressed, and yield can be improved.
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[0016]
It is sectional drawing which shows 1 process in the Example of the manufacturing method of the
dynamic microphone unit which concerns on this invention.
It is sectional drawing which shows the other process in the Example of the manufacturing
method of the dynamic microphone unit which concerns on this invention.
It is a graph which shows the frequency characteristic of the dynamic microphone unit
concerning the present invention.
It is sectional drawing which shows 1 process of the manufacturing method of the conventional
dynamic microphone unit.
It is sectional drawing which shows the other process of the manufacturing method of the
conventional dynamic microphone unit. It is a graph which shows the frequency characteristic of
the conventional dynamic microphone unit.
[0017]
Hereinafter, an embodiment of a method of manufacturing a dynamic microphone unit according
to the present invention will be described with reference to the drawings. The same reference
numerals are given to the same components as those in the above-described conventional
example.
[0018]
As shown in FIGS. 1 and 2, the dynamic microphone unit 1 has the same configuration as that of
the above-described conventional dynamic microphone unit, that is, a dynamic microphone unit
having a vibration unit 10 that receives and vibrates sound waves and a magnetic circuit 20. Is
equipped.
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[0019]
The vibration unit 10 has a diaphragm 8 and a voice coil (power generation coil) 9.
The diaphragm 8 is a member made of a thin film made of resin or the like, and has a center
dome 81 and a sub dome 82 provided continuously around the center dome 81. The voice coil 9
is attached to the boundary between the center dome 81 and the sub dome 82 by an adhesive or
the like.
[0020]
The magnetic circuit 20 includes a permanent magnet 2, a pole piece 3 provided on one pole side
of the permanent magnet 2, and a ring yoke 5 magnetically coupled to the other pole side of the
permanent magnet via the yoke 4. including. In the magnetic gap 7 formed between the pole
piece 3 and the ring yoke 5, the voice coil 9 is vibratably supported via the diaphragm 8.
[0021]
The pole piece 3 is a cylindrical member provided on one pole side of the permanent magnet 2,
and the outer diameter thereof is smaller than the inner diameter of the voice coil 9, and the
dynamic microphone unit 1 is assembled. In the state, the pole piece 3 is positioned between the
outer peripheral surface thereof and the inner peripheral surface of the voice coil 9 at a
predetermined interval.
[0022]
The ring yoke 5 is a flat cylindrical member having a hole at its center, and is configured of a
small diameter portion 51 with a small outer diameter and a peripheral wall 52 with a large
outer diameter.
The diameter of the central hole of the ring yoke 5 is such that the spacer 11 of the jig 12
described later can be inserted, and the voice coil 9 can be inserted at a predetermined distance
from the outer peripheral surface thereof. There is. Further, the outer peripheral surface 511 of
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the small diameter portion 51 has an outer diameter that can be inserted into the recess 121 of
the jig 12. The inner diameter of the peripheral wall 52 is such a size that the vibrating portion
10 can be inserted, and the outer diameter of the peripheral wall 52 is the same as the outer
diameter of the yoke 4. On the inner side of the peripheral wall 52 of the ring yoke 5, a stepped
portion 53 formed of a surface in a direction orthogonal to the peripheral wall 52 is provided.
[0023]
The magnetic gap 7 is a circular groove-shaped space formed between the outer peripheral
surface of the pole piece 3 and the inner peripheral surface of the ring yoke 5, and the voice coil
9 is an outer peripheral surface of the pole piece 3 and the ring yoke 5. It has a width and a
depth that can be inserted at predetermined intervals with respect to the inner circumferential
surface.
[0024]
The manufacturing method of such a dynamic microphone unit is demonstrated below.
First, the voice coil 9 is fixed to the boundary between the center dome 81 and the sub dome 82
of the diaphragm 8 using an adhesive.
[0025]
Next, the ring yoke 5 is disposed in the jig 12. The jig 12 has a substantially cylindrical shape,
and a recess 121 having a circular planar shape is formed at the upper end portion. A fitting
recess 122 is further formed in the central portion of the recess 121, and in this fitting recess
122, a cylindrical shaft 123 provides a predetermined distance between the outer peripheral
surface thereof and the inner peripheral surface of the fitting recess 122. Fit. Therefore, a
circular groove 124 is formed between the fitting recess 122 and the cylindrical shaft 123.
[0026]
A cylindrical spacer 11 made of a thin plate is inserted and fixed in the circular groove 124 and
protrudes from a plane formed by the fitting recess 122 and the cylindrical shaft 123. The
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material of the spacer 11 is preferably a PET film. Further, by setting the thickness of the spacer
11 to 75 μm to 100 μm, contact between the voice coil 9 and the ring yoke 5 can be prevented
while maintaining good sensitivity of the dynamic microphone unit 1.
[0027]
The ring yoke 5 is positioned in the planar direction when the outer peripheral surface 511 of
the small diameter portion 51 contacts the inner peripheral surface 1211 of the recess 121 of
the jig 12. Further, the inner circumferential surface 512 of the ring yoke 5 has a diameter
slightly larger than the outer circumferential surface 111 of the spacer 11 so that the spacer 11
can enter the central hole of the ring yoke 5.
[0028]
Next, an adhesive is applied to the step portion 53 of the ring yoke 5 disposed in the jig 12. As
the adhesive, it is preferable to use an ultraviolet curable adhesive, a thermosetting adhesive or
the like in order to enable fine adjustment of the mounting position of the vibrating portion 10
after the vibrating portion 10 is mounted on the ring yoke 5 . However, another adhesive may be
used as long as fine adjustment of the mounting position of the vibration unit 10 is possible
before the adhesive is cured.
[0029]
Next, the vibrating portion 10 is placed on the ring yoke 5 before the adhesive applied to the ring
yoke 5 is cured. At this time, the voice coil 9 is inserted on the inner peripheral side of the spacer
11. By doing this, the ring yoke 5 and the voice coil 9 are positioned by the spacer 11 in an
appropriately separated state.
[0030]
Next, the adhesive is cured, and the vibrating portion 10 is fixed to the ring yoke 10. Thus, the
vibrating portion 10 is fixed to the ring yoke 5 in a state where the ring yoke 5 and the voice coil
9 are properly separated by the spacer 11.
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[0031]
Next, the ring yoke 5 to which the vibration unit 10 is fixed is taken out from the jig 12. By
observing the taken-out ring yoke 5 from the side opposite to the side on which the vibrating
portion 10 is fixed, it can be confirmed whether the ring yoke 5 and the voice coil 9 are properly
separated.
[0032]
Next, in the magnetic circuit 20, the ring yoke 5 to which the vibrating portion 10 is fixed is
incorporated into a member excluding the ring yoke 5, that is, the assembly of the permanent
magnet 2, the pole piece 3 and the yoke 4. Specifically, the ring yoke 5 to which the vibrating
portion 10 is fixed is incorporated into the yoke 4 by fitting the outer peripheral surface 511 of
the small diameter portion 51 to the inner peripheral surface 411 of the distal end portion 41 of
the yoke 4. The outer peripheral surface 511 of the small diameter portion 51 of the ring yoke 5
is fitted to the inner peripheral surface 411 of the distal end portion 41 of the yoke 4, whereby
the ring yoke 5 is accurately positioned with respect to the yoke 4 and the magnetic circuit 20.
The inner circumferential surface 1211 of the jig 12 and the inner circumferential surface 411 of
the yoke 4 have the same diameter, and the concentricity between the pole piece 3 and the yoke
4 is accurately determined. The relative positional relationship between the yoke 5 and the
vibrating portion 10 is reproduced as the relative positional relationship between the ring yoke 5
and the diaphragm 10 with respect to the yoke 4.
[0033]
Thus, the dynamic microphone unit 1 is completed. In the completed dynamic microphone unit 1,
the voice coil 9 can be effectively prevented from contacting the ring yoke 5 and the pole piece
3. Further, unlike the conventional method of manufacturing the dynamic microphone unit, since
the resin spacer is not used at the assembly stage of the magnetic circuit, it is possible to prevent
the foreign matter from remaining due to the wear of the spacer. Therefore, by using the method
of manufacturing a dynamic microphone unit according to the present invention, the generation
of defective products can be effectively suppressed.
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[0034]
In the dynamic microphone unit obtained by using the conventional method of manufacturing
the dynamic microphone unit, as shown by arrows A, B and C in FIG. I will. This is because, as
described above, in the dynamic microphone unit manufactured by the conventional method of
manufacturing the dynamic microphone unit, the contact of the voice coil 9 to the ring yoke 5
and the pole piece 3 and the remaining of foreign matter on the spacer occur. , Indicates that
defective products will occur.
[0035]
On the other hand, in the dynamic microphone unit manufactured by the method of
manufacturing the dynamic microphone unit according to the present invention, the contact of
the voice coil 9 to the ring yoke 5 or the pole piece 3 and the foreign matter remaining on the
spacer occur. Absent. Therefore, as shown in FIG. 3, no change in the frequency characteristic is
seen in the region corresponding to the frequency region shown by arrows A, B and C in FIG.
[0036]
Thus, by using the method of manufacturing a dynamic microphone unit according to the
present invention, it is possible to suppress the generation of defective products and improve the
yield.
[0037]
Reference Signs List 1 dynamic microphone unit 2 permanent magnet 3 pole piece 4 yoke 5 ring
yoke 51 peripheral portion 6 resin spacer 7 gap 8 diaphragm 81 center dome 82 sub dome 9
voice coil 10 vibrating portion 11 spacer 12 jig 121 recessed portion 20 magnetic circuit
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