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JPH06303698

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DESCRIPTION JPH06303698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone and a method of manufacturing the same.
[0002]
2. Description of the Related Art FIG. 15 shows the construction and manufacturing method of a
microphone unit in a conventional microphone. Reference numeral 50 denotes a microphone
unit, 51 denotes a screen unit which is a front part of the microphone unit 50, and 52 denotes an
equalizer to which the screen unit 51 is attached.
[0003]
Further, 53 indicates a diaphragm ring, 54 indicates a diaphragm, 55 indicates a voice coil, 56
indicates a magnet, and 57 indicates a yoke. The yoke 57 is attached to the cavity 58, and a
vibration proof rubber 59 is attached to the circumferential surface of the cavity 58. Then, the
magnet 56 is attached to the internal space of the yoke 57.
[0004]
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1
The voice coil 55 is attached to the diaphragm 54, and the diaphragm 54 is attached to the
diaphragm ring 53 at its outer peripheral end portion. When the diaphragm ring 53 is fixed to
the upper surface of the yoke 57, the voice coil 55 is disposed in the gap between the yoke 53
and the magnet 56 as shown in FIG. ) Is formed. The electric signal wire (lead wire) 55a from the
voice coil 55 is soldered and fixed to the terminal 60 provided on the side surface of the yoke 57
with the solder H, and the lead wire 61 is also soldered to the terminal 60. An audio signal input
to the microphone is taken out by 61.
[0005]
Then, with the diaphragm 54 and the voice coil 55 attached to the yoke 57 and the magnet 56 in
this manner, the equalizer 52 is attached from above to be covered.
[0006]
Thus, when the microphone unit 50 is manufactured and disposed in the housing as a
microphone, the sound picked up by the microphone has its sound pressure transmitted through
the screen unit 51 and the diaphragm 52 through the opening 52 a of the equalizer 52. The
voice coil 55 is vibrated up and down at the position of the gap between the yoke 57 and the
magnet 56, and the electromagnetic action at this time causes an audio signal as an electric
signal to be taken out.
[0007]
By the way, the above-mentioned manufacturing method has the following drawbacks.
First, in order to form a magnetic circuit by the yoke 57, the magnet 56, and the voice coil 55 in
advance, its placement accuracy and the like are strictly required, and there is a problem that it
takes time and effort for manufacturing. In the case where disconnection or the like of the lead
wire 55a from the voice coil 55 occurs after assembly of the microphone or after completion of
the microphone, it is necessary to replace all of the magnetic circuit portion, which is very
uneconomical and leads to cost increase. There is a problem that it takes time and effort for
manufacturing.
[0008]
Further, as a problem of the conventional microphone, when the volume between the yoke 57
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and the magnet 56 is increased, the stiffness of the volume and the resonance of the diaphragm
54 occur, which adversely affects the characteristics.
[0009]
For example, FIG. 16 shows frequency characteristics.
Each curve in FIG. 16 shows frequency characteristics at various directivity angles of 0 ° (front
direction), 90 ° (side direction), and 180 ° (rear direction) with respect to the microphone unit
50.
As can be seen from FIG. 16, the influence of the stiffness of the volume and the resonance of the
diaphragm 54 appears in the band of about 1 KHz to 2 KHz, and the frequency characteristic is
deteriorated. And damping | braking of this resonance is made very difficult. In addition, the 180
° directivity characteristic is also a problem in practical use because it is deteriorated in the
middle range or more.
[0010]
As measures against the influence of resonance, it is conceivable to raise the stiffness in the yoke
17 to bring the resonance frequency to a high frequency, but this is not only difficult to
manufacture in practice but also the impedance of the acoustic circuit is increased. It is not
preferable because the sensitivity is lowered.
[0011]
SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention
to eliminate the deterioration of frequency characteristics due to resonance, improve the
sensitivity, and simplify the manufacture.
[0012]
For this purpose, in a microphone provided with a microphone unit in which a voice coil attached
to a diaphragm is disposed in a gap between a yoke and a magnet to constitute an acousticelectric conversion unit, the microphone unit includes a yoke and a magnet. An opening
communicating the space of the gap to the outer side of the microphone unit is formed, and the
opening is closed from the outside of the microphone unit by a substantially sheet-like resistor
01-05-2019
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attached to the outer surface side of the microphone unit.
[0013]
Further, an opening facing the outside of the microphone unit from the inside of the microphone
unit is provided, and a compressed foam material is attached as a resistor from the opening to a
position on the outside of the microphone unit.
[0014]
Furthermore, the diaphragm and the voice coil are attached to the equalizer member, and the
equalizer member is attached to the portion having the yoke portion and the magnet, thereby
forming an acousto-electric conversion portion, and from the voice coil The lead wire is
configured to be joined to a terminal portion provided to the equalizer member.
[0015]
Further, as a method of manufacturing the microphones of these configurations, first, the
diaphragm and the voice coil are attached to the equalizer member, and the lead wire from the
voice coil is joined to the terminal portion provided on the equalizer member.
Then, in this state, the equalizer member is attached to the portion having the yoke portion and
the magnet so that the acousto-electrical conversion portion is formed.
[0016]
For example, an opening is provided in the yoke and the cavity, and the space between the yoke
and the magnet is communicated with the outward side of the microphone unit, and an
appropriate sheet-like resistor (for example, Papiron paper) is provided for the opening. By
applying the resistance, the influence of the stiffness in the yoke and the resonance of the
diaphragm can be eliminated.
Moreover, by using a compression foam material (for example, compression urethane) as the
resistor, the resonance damping and the high-range resistance value are improved, and the
sensitivity is improved.
01-05-2019
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[0017]
Furthermore, if the diaphragm and voice coil are mounted on the equalizer side, disconnection of
the voice coil can be dealt with simply by replacing the equalizer side, and after the diaphragm
and voice coil are mounted on the equalizer side If the acousto-electrical conversion unit is
formed by mounting this on the portion having the yoke portion and the magnet, the
manufacture of the microphone unit becomes very easy.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A microphone and a method of
manufacturing the same according to a first embodiment of the present invention will be
described below with reference to FIGS.
[0019]
FIG. 2 is a partially cutaway view of the microphone, and 1 indicates the entire microphone.
The microphone 1 has a sound collecting unit 2 and a main unit 3 at the top, and a connector
unit 4 is connected to the lower part of the main unit 3 and an audio signal collected by sound is
not shown in equipment such as a microphone amplifier and a mixer. It is made to be
transmitted.
Reference numeral 5 is a cushion belt attached around the sound collecting unit 2.
[0020]
For example, a substrate 6 is disposed inside the main body portion 3, and a switch 7 for turning
on / off the microphone 1 is connected to, for example, a circuit or a printed line on the
substrate.
Reference numeral 8 denotes a lead wire, 9 denotes a connector, and an audio signal from the
microphone unit 10 mounted inside the sound collection unit 2 is supplied to the circuit on the
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substrate 6 through the lead wire 8 and the connector 9, and the switch 7 It is made to be output
via the connector part 4 by being in the ON state.
[0021]
For example, the microphone unit 10 mounted in the inside of the sound collecting unit 2 as
described above is configured as shown in FIGS. 1 and 3.
FIG. 1 is a perspective view of the microphone unit 10, and FIG. 3 is a cross-sectional view of the
microphone unit 10.
[0022]
In these figures, 11 is a screen unit, 12 is an equalizer to which the screen unit 11 is attached, 13
is a diaphragm ring, 14 is a diaphragm, 15 is a voice coil, 16 is a magnet, 17 is a yoke, 18 is a
plate, 19 is a cavity 20 denotes compressed urethane foam provided as a resistor, 21 denotes
Papiron paper affixed to the circumferential surface of the cavity 19 as a directional resistance,
and 22 denotes a vibration-proof rubber.
The cavity 19 is made of, for example, pill rubber or resin. Further, as the vibration-proof rubber
22, for example, petit rubber is suitable.
[0023]
First, the equalizer 12 will be described with reference to FIG. FIG. 4 is a perspective view of the
equalizer 12. As can be seen from the sectional views of FIGS. 4 and 3, the equalizer 12 is formed
in a substantially cylindrical shape in which the upper and lower portions in the cylinder are
partitioned by the middle plate portion 12e. The screen unit 11 is attached to the in-cylinder
portion on the upper surface side of the middle plate portion 12e, and a required number of
openings 12a are formed in the middle plate portion 12e. The opening 12 a is an opening for
transmitting the sound pressure taken in via the screen unit 11 to the lower diaphragm 14.
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[0024]
Further, a pair of terminal portions 12 b is provided on the circumferential surface of the
equalizer 12, and a slit 12 c in a state where the circumferential surface of the equalizer 12 is cut
away from below is provided between the pair of terminal portions 12 b. It is formed.
[0025]
In the microphone 1 of this embodiment, not only the screen unit 11 but also the diaphragm ring
13, the diaphragm 14, and the voice coil 15 are fixed to the equalizer 12 in advance by bonding
or the like.
A state in which the diaphragm ring 13, the diaphragm 14, and the voice coil 15 are fixed to the
equalizer 12 is shown in FIG. 5 as a perspective view from below.
[0026]
As can be seen from FIGS. 5 and 3, the diaphragm ring 13 is adhered and fixed to the inner
peripheral surface 12 f of the equalizer 12 at the inner side of the cylinder below the middle
plate portion 12 e, and the diaphragm 14 has the diaphragm 14. Is adhesively fixed. Also, the
voice coil 15 is fixed to the diaphragm 14 and vibrates up and down with the up and down
vibration of the diaphragm 14.
[0027]
Then, as can be seen from FIG. 5, the lead wires 15a of the voice coil 15 are led out of the slits
12c to the outside of the equalizer 12, and the respective lead wires 15a are soldered and fixed
with solder H at the terminal portions 12b. Further, lead wires 8 are respectively soldered and
fixed to the respective terminal portions 12b.
[0028]
After the soldering is performed, if the continuity test is performed and it is determined that the
electrical connection state is appropriate, the soldered terminal portion 12b and the slit portion
are formed as shown in FIG. Adhesive S is applied to the upper surface of 12c, and the slit
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portion 12c is almost closed, and the fixed terminal portions of the lead wire 15a and the lead
wire 8 are also closed with the adhesive S to make the fixed connection state strong.
[0029]
On the other hand, the component having the magnet 16 and the yoke 17 is shown in FIG.
As can be seen from FIGS. 6 and 3, a ring-shaped plate 18 is mounted on the inner peripheral
surface on the upper surface side of the substantially cylindrical yoke 17. The magnet 16 is
disposed and fixed to the inner cylindrical portion of the yoke 17 and the plate 18.
[0030]
Further, the upper peripheral surface of the cylindrical shape of the yoke 17 is formed as a
flange portion 17d having an L-shaped cross section, and the flange portion 17d is formed with a
required number of openings 17a. Furthermore, as shown in FIG. 3, a compressed urethane foam
20 as a resistive material is disposed on the inner pocket portion obtained by the flange portion
17d having an L-shaped cross section, ie, the portion below the opening 17a. ing.
[0031]
Further, as shown in FIG. 6, a required number of openings 17b are also formed on the
cylindrical peripheral surface portion of the yoke 17, and the openings 17b correspond to the
inner peripheral portion of the yoke 17 and the outer peripheral portion of the magnet 16 as
shown in FIG. It communicates with the outside of the yoke 17 from the space portion of the gap
between them.
[0032]
And, such a yoke 17 is inserted into and fixed to the cylindrical inner portion of the cavity 19 as
shown by the arrow in FIG. 6, but the cavity 19 is also provided with an opening 19a on the
outer peripheral surface thereof The opening 19 a is provided at a position substantially
corresponding to the opening 17 b of the yoke 17.
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Accordingly, when the yoke 17 is attached to the cavity 19, as shown in FIG. 3, the space portion
of the gap between the inner peripheral portion of the yoke 17 and the outer peripheral portion
of the magnet 16 is formed by the openings 17b and 19a. It will communicate outside. However,
Papiron paper 21 as a directional resistance is attached to the cylindrical peripheral surface
portion where the opening 19a is provided in the cavity 19, and accordingly, the gap between
the inner peripheral portion of the yoke 17 and the outer peripheral portion of the magnet 16 is
The space portion is shielded from the outside of the microphone unit 10 by papyron paper 21.
[0033]
As can be seen from FIG. 3, a damper resistor 23 is disposed between the bottom of the yoke 17
and the cavity 19. A required number of openings 17 c are provided in the bottom of the yoke
17, and the openings 17 c and the space inside the cylinder of the cavity 19 are separated by a
damper resistance 23. Further, an opening 19 b is also provided in the bottom of cavity 19, and
the space inside cavity 19 and the space between the outer peripheral surface of cavity 19 and
vibration-proof rubber 22 mounted around cavity 19 are communicated. ing.
[0034]
The state in which the yoke 17 is inserted into and fixed to the cavity 19 is shown in FIG. Thus,
the microphone unit 10 of this embodiment has the diaphragm 12, the voice coil 15 and the like
fixed as described above with respect to the cavity 19 side where the magnet 16 and the yoke 17
are fixed as shown in FIG. Attached from above as shown. The state corresponding to FIG. 7 is
shown in FIG. 8 as a sectional view.
[0035]
During this mounting, the equalizer 12 is coated with an adhesive on the inner peripheral surface
12 f of the lower cylindrical portion thereof, or is coated on the outer peripheral surface 17 d 1
of the flange portion 17 d of the yoke 17. The outer peripheral surface 17d1 of the flange
portion 17d of the yoke 17 is engaged with the inner peripheral surface 12f of the yoke 17 so as
to be adhesively fixed by the applied adhesive. At this time, the voice coil 15 is inserted into the
gap between the plate 18 fixed to the yoke 17 and the magnet 16, that is, assembled in the state
shown in FIG.
01-05-2019
9
[0036]
By thus assembling, in the microphone unit 10, the difficult operation of pre-installing the
magnetic circuit of the voice coil 15, the magnet 16, the yoke 17 and the plate 18 is eliminated,
and the magnetic circuit is called joining of the equalizer 12 to the yoke 17. It will be formed
according to the time of final assembly, and the labor at the time of manufacture is remarkably
eased. Furthermore, although an electrical disconnection often occurs in the voice coil 15, in
such a case, it is sufficient to replace only the equalizer 12 portion, causing an accident such as a
disconnection of the voice coil 15, a contact failure or the like. The corresponding effort will be
greatly simplified, and the economy will be improved, leading to cost reduction.
[0037]
In the present embodiment, the openings 17a, 17b, 17c of the yoke 17 and the openings 19a,
19b of the cavity 19 are provided, and an appropriate resistance is given by the Papiron paper
21 on the outer surface side of the openings 17b, 19a. The resistance by the compressed
urethane foam 20 is applied to the opening 17a, whereby the stiffness inside the yoke 17 is
adjusted, and the occurrence of the resonance of the diaphragm 14 can be prevented.
[0038]
The data obtained by measuring the frequency characteristics in the microphone unit 10 of this
embodiment is shown in FIG. 9. As can be seen from the comparison with the conventional
example shown in FIG. 16, resonance in a band of about 1 KHz to 2 KHz The influence of the is
eliminated, and good characteristics are obtained over a wide band.
[0039]
By the way, as a resistive material provided corresponding to the opening 17a of the yoke 17, it
is also conceivable to use Papiron paper 24 as shown in FIG. 10 instead of the compressed
urethane foam 20, and such a microphone as the microphone of the present invention Even in
the case of employing the unit 10, it is possible to eliminate the influence of resonance and
obtain good frequency characteristics.
The measurement data in this case is shown in FIG.
01-05-2019
10
[0040]
However, as can be seen by comparing FIG. 9 and FIG. 11, the damping effect of the resonance is
more effectively exhibited by using the compressed urethane foam 20 as the resistance material,
and the resistance value in the high region is appropriate. The advantage that the sensitivity is
further improved (the impedance can be lowered) is exhibited.
In particular, the sensitivity improvement effect is remarkable in the middle or higher band in the
180 ° pointing direction.
[0041]
As for the Papiron paper 21 used as the directional resistance in the cavity 19 in the above
embodiment or the Papiron paper 24 in the modified example of FIG. 10, it may be considered to
use a cloth or a wire mesh as a resistance material instead.
[0042]
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 12 is a perspective view of the microphone unit 10 of this embodiment, FIG. 13 is a cross
sectional view, and FIG. 14 is a cross sectional view for showing a manufacturing method. The
same functional parts as in the first embodiment are denoted by the same reference numerals to
avoid redundant description.
[0043]
Also in the microphone unit 10 of this embodiment, as shown in FIG. 13, the yoke 17 is provided
with an opening 17 a in its flange portion 17 d, and the peripheral surface of the yoke 17 is
provided with an opening 17 b. An opening 17c is provided. Further, an opening 19a is also
provided in the cavity 19 at a position corresponding to the opening 17b of the yoke 17 in the
peripheral surface portion, and further mounted around the inner space of the cavity 19, the
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outer peripheral surface of the cavity 19 and the periphery of the cavity 19. The space portion of
the gap between the rubber bands 22 is communicated by the opening 19b.
[0044]
In this case, the cylindrical outer peripheral surface of the yoke 17 is not in contact with the
cavity 19, and the yoke 17 is adhesively fixed to the cavity 19 at the tip of the flange portion
17d. The opening 17a provided in the flange portion 17d and the opening 17b on the cylindrical
peripheral surface are in communication with the space between the outer periphery of the yoke
17 and the inner periphery of the cavity 19. Further, this space is the opening 19a of the cavity
19. Are facing outward by Then, a directional resistance made of, for example, Papiron paper is
attached to the outer peripheral surface of the cavity 19, and an appropriate resistance is given
to the internal space communicated by the openings 17a, 17b and 19a.
[0045]
Also in this embodiment, the openings 17a, 17b, 17c and the openings 19a, 19b of the cavity 19
are provided in this way, and the Papiron paper 21 provides appropriate resistance on the outer
surface side of the openings 17b, 19a, The stiffness inside the yoke 17 is adjusted, and it is
possible to prevent the resonance of the diaphragm 14 from being generated.
[0046]
Further, when manufacturing this microphone unit 10, as shown in FIG. 14, the screen unit 11,
the diaphragm ring 13, the diaphragm 14, and the voice coil 15 are shown in advance to the
equalizer 12 as in the first embodiment. It is fixed by fitting this equalizer 12 side to the yoke 17
side.
[0047]
That is, during the mounting, the adhesive is applied to the inner peripheral surface 12 f of the
lower cylindrical portion of the equalizer 12, or the outer peripheral surface 17 d 1 of the flange
portion 17 d of the yoke 17 is applied. The outer peripheral surface 17d1 of the flange portion
17d of the yoke 17 is fitted into the inner peripheral surface 12f of the cylinder, and is adhered
and fixed by the applied adhesive.
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At this time, the voice coil 15 is inserted into the gap between the plate 18 fixed to the yoke 17
and the magnet 16, ie, assembled in the state shown in FIG.
The Papiron paper 21 is pasted from the cavity 19 to the circumferential surface of the equalizer
12 after the equalizer portion is assembled.
[0048]
By such a manufacturing method, the operation is simplified as in the first embodiment, and it is
only necessary to replace only the equalizer 12 with respect to the occurrence of electrical
disconnection of the voice coil 15. The trouble of dealing with the accident such as the
disconnection of the voice coil 15 or the contact failure can be greatly simplified.
[0049]
Although the embodiment has been described above, the microphone of the present invention is
not limited to the configuration of the above embodiment, and various changes may be made
within the scope of the present invention.
For example, various changes may be made in accordance with the use method, the type of
microphone according to the use object, etc., and the setting of the directivity.
[0050]
As described above, in the microphone of the present invention, for example, an opening is
provided in the yoke and the cavity, and the space between the yoke and the magnet is
communicated with the outside of the microphone unit, By giving an appropriate resistance by a
sheet-like resistor (for example, Papiron paper), the influence of the stiffness in the yoke and the
resonance of the diaphragm can be eliminated, and an advantageous effect can be realized that
good frequency characteristics can be realized. Further, in particular, by using a compression
foam material such as compression urethane as the resistor, in addition to the improvement of
damping of the resonance, there is an effect that the resistance value of the high region becomes
good and the sensitivity can be improved. These can greatly contribute to the improvement of
directivity, the prevention of howling, and the improvement of sound quality.
01-05-2019
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[0051]
Furthermore, by attaching the diaphragm and the voice coil on the equalizer side and further
providing an electrical connection terminal for the voice coil on the equalizer, disconnection of
the voice coil can be dealt with only by replacing the equalizer side. It has the effect of
[0052]
In addition, the diaphragm and the voice coil are attached in advance to the equalizer side in this
way, and the lead wire from the voice coil is connected to the terminal on the equalizer on the
equalizer, and this equalizer side is a part having a yoke and a magnet. If the acousto-electrical
conversion unit is formed by mounting on the microphone, the microphone unit can be
manufactured very easily.
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