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JP2009177724

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DESCRIPTION JP2009177724
A ribbon microphone capable of provisionally positioning an end of a ribbon at a predetermined
position when the contact resistance between the ribbon diaphragm and the electrode is further
reduced and the end of the ribbon is fixed to the electrode. A unit, its manufacturing method and
a ribbon microphone are obtained. SOLUTION: A magnet for forming a magnetic gap, a ribbon
diaphragm 5 arranged in the magnetic gap and vibrated by a sound wave, and an output of an
electric signal generated by the diaphragm 5 vibrating in the magnetic gap An electrode 12, a
frame 7 for holding the magnet and the electrode 12, and a pinching member 81 for
sandwiching and fixing both end portions in the lengthwise direction of the diaphragm 5 with the
electrode 12 are provided. The pinching member 81 is fixed to the frame 7 and crimps both ends
in the longitudinal direction of the diaphragm 5 to the electrode 12, and a fat and oil 85
containing conductive powder is interposed between the electrode 12 and the ribbon diaphragm
5. There is. [Selected figure] Figure 1
Ribbon-type microphone unit, method of manufacturing the same, and ribbon-type microphone
[0001]
The present invention relates to a ribbon microphone unit, a method of manufacturing the ribbon
microphone unit, and a ribbon microphone, and in particular, provides a configuration that
facilitates assembly and ensures electrical connection to reduce connection resistance. It is.
[0002]
The ribbon microphone unit is mainly composed of a magnet that forms a magnetic field and a
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ribbon diaphragm.
The magnets are disposed on both sides of the ribbon diaphragm, and a magnetic field is formed
between the magnets on both sides. The ribbon diaphragm is provided with an appropriate
tension to hold both end portions in the length direction and disposed in the magnetic field. The
ribbon diaphragm receives a sound wave and vibrates in a magnetic field, whereby a current
corresponding to the sound wave flows through the ribbon diaphragm and the sound wave is
converted into an electric signal. Conventionally, an aluminum foil is widely used as a material of
the ribbon diaphragm. Aluminum is suitable as a ribbon diaphragm of a ribbon microphone
because it has better conductivity and lighter specific gravity than other metal materials.
[0003]
FIG. 8 shows an example of a general ribbon microphone unit. In FIG. 8, the ribbon microphone
unit 3 includes a frame 7 formed in a rectangular frame shape long in the vertical direction. The
frame 7 is made of a magnetic material, and on both sides of the inner surface, a pair of
permanent magnets 4 and 4 are fixed along the long side direction at predetermined intervals
between both permanent magnets 4 and 4. The permanent magnets 4 and 4 are magnetized in
the width direction (left and right direction in FIG. 8A), and the magnetization directions of the
permanent magnets 4 and 4 are the same. Therefore, a parallel magnetic field is formed between
the permanent magnets 4 and 4.
[0004]
In the above-mentioned parallel magnetic field, a ribbon diaphragm (which may be simply
referred to as a "ribbon" hereinafter) 5 which also serves as a diaphragm and a conductor is
disposed. The ribbon 5 has an elongated strip shape, and both ends in the lengthwise direction
are fixed to electrode lead portions 18 and 18 provided at both ends in the lengthwise direction
of the frame 7. The electrode lead portions 18 and 18 are insulated from the frame 7, and the
ribbon 5 is conducted in a conductive state by sandwiching both ends of the ribbon 5 with the
holding member 8 and the ribbon 5 in a state where the ribbon 5 is given a suitable tension.
Hold Portions inside the portions corresponding to the electrode lead-out portions 18, 18 at both
end portions of the ribbon 5 are formed in a triangular wave shape by being alternately bent at
constant intervals. The direction of the line formed by the bending, that is, the direction of the
line drawn by the crests and valleys of the triangular wave is the width direction of the ribbon 5,
and the lines are formed at regular intervals. Hereinafter, portions formed in a waveform on the
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inner side of the portions corresponding to the electrode drawing portions 18 of the ribbon 5
will be referred to as a waveform end portion 51, respectively.
[0005]
The terminal boards 9 are respectively superimposed on the electrode lead portions 18 and 18,
and the pinching members 8 are superimposed on the respective terminal boards 9 with the end
of the ribbon 5 interposed therebetween. The terminal plates 9 are electrically connected to the
ends of the ribbon 5 through the holding members 8 so that signals from the ribbon microphone
unit 3 are output from the terminal plates 9. . The longitudinal middle portion of the ribbon 5 is
the top of the triangular wave along the line in the direction orthogonal to the direction of the
line drawn by the top and the bottom of the triangular wave of the waveform end 51, ie, the
longitudinal line of the ribbon 5. It is the waveform middle portion 52 in which the valley bottom
is formed. Corrugated unevenness is not formed on both ends in the lengthwise direction of the
ribbon 5 and is flat.
[0006]
The ribbon 5 receives the sound wave and vibrates in accordance with the sound wave. The
vibration direction is a direction crossing the magnetic flux between the permanent magnets 4
and 4, and the ribbon 5 made of a conductor generates electric power by crossing the magnetic
flux, and both ends of the ribbon 5 in the lengthwise direction, hence the electrode lead portions
18, 18. An electrical signal is generated between them. Since this electrical signal becomes a
signal of frequency and amplitude corresponding to the frequency and amplitude of the ribbon 5,
the sound wave striking the ribbon 5 will be converted into an electrical signal corresponding to
this sound wave. Since the ribbon microphone is an inertial control system, the resonance
frequency of the ribbon 5 needs to be lower than the lower frequency of the sound wave to be
collected, in other words, lower than the lowest frequency of the frequency range in which the
sound can be collected. is there. For this reason, the tension of the ribbon 5 is set extremely low.
As described above, the ribbon 5 achieves low tension by forming the corrugated end 51 by
bending at both ends.
[0007]
9 and 10 are enlarged views of the ribbon diaphragm 5 and the holding member 8 in the ribbon
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microphone unit shown in FIG. 9 and 10, both ends of the ribbon diaphragm 5 in the longitudinal
direction are sandwiched by a pair of holding members 8 and 81, and fixed by tightening the
both ends of the holding members 8 and 81 with a screw 10. ing. One of the pinching members
8 and 81 is a stationary side pinching member, and the other is a movable side pinching member.
The stationary side pinching member is integrally fixed to the frame 7. When the pinching
members 8 and 81 are strongly tightened with the screw 10, both end portions of the pinching
members 8 and 81 are curved in a direction closer to the vibrating plate 5 than the widthwise
central portion thereof. Since the pressure at the central portion in the width direction of the
ribbon diaphragm 5 is weak due to the bending of the clamping members 8 and 81 in this
manner, only the both ends are in contact with the clamping members 8 and 81. The conductive
resistance of the connection part with this increases. Therefore, if the clamping force of both
ends of the opposing holding members 8 and 81 is adjusted so that the ribbon diaphragm 5
uniformly contacts the holding members 8 and 81, the tightening force is too weak. The
conductive resistance of the connection portion with the ribbon diaphragm 5 is increased.
[0008]
The electrical signal generated by the ribbon diaphragm in cooperation with the magnetic field is
weak. For this reason, a ribbon microphone generally known is provided with a step-up
transformer to boost the voltage of a weak electric signal. However, since the electric signal flows
on the electric circuit as a weak electric signal between the ribbon diaphragm and the
transformer, it is necessary to minimize the conductive resistance. The electrical resistance of the
ribbon diaphragm is about 0.1 to 0.2 Ω. The electrical resistance of the primary winding of the
step-up transformer is about 0.2Ω, and the electrical resistance of the secondary winding is
about 600Ω. As described above, since the electrical resistance of the ribbon diaphragm is small,
it is possible to set 0. 0 between the ribbon and the transformer. Even with resistances as small
as several ohms, problems such as a decrease in sensitivity and an increase in output impedance
occur. For example, if it is assumed that the connection resistance of the terminal portion
including the holding members 8 and 81 is 0.1Ω with respect to a ribbon of 0.1Ω, a weak
electric signal becomes a further weak signal ( As the sensitivity decreases), the output
impedance increases according to the transformer's transformation ratio. However, according to
the conventional ribbon type microphone unit, the connection resistance between the ribbon
diaphragm 5 and the terminal portion tends to be large due to the above-mentioned
circumstances, and there are problems such as a decrease in sensitivity and an increase in output
impedance.
[0009]
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Further, both end portions 54 in the lengthwise direction of the ribbon diaphragm 5 in the
conventional ribbon microphone unit are flat. When replacing the ribbon diaphragm 5 in the
production process of the ribbon microphone unit or in maintenance, both ends of the ribbon
diaphragm 5 in the electrode lead-out portions 18 and 18 formed on the frame 7 of the ribbon
microphone unit 3 Must be placed. However, since both ends 54 of the ribbon diaphragm 5 are
flat surfaces, their rigidity is weak and they become unstable, the posture when attaching to the
electrode lead-out portion 18 becomes unstable, and the attachment work of the diaphragm
becomes difficult. There are Further, when both end portions of the ribbon diaphragm 5 are
disposed in the electrode lead portions 18 and 18 and sandwiched by the pinching members 8
and 81 and tightened with the screw 10, stress due to tightening of the screw 10 is applied to
the pinching members 8 and 81. As a result, the holding members 8 and 81 rotate around the
screw 10 to twist the ribbon diaphragm 5, stress is applied to the diaphragm 5, and the faithful
vibration according to the sound wave can not be made. If the ribbon diaphragm 5 is slightly
twisted due to the tightening force of this screw, it is necessary to perform the diaphragm
assembling operation again. The rate at which the assembly must be re-done is called the failure
rate, and the shape of the above-described conventional ribbon diaphragm has a problem of
increasing the failure rate at the time of assembly.
[0010]
The invention described in Patent Literature 1 is an invention described in Patent Literature
related to the present invention. The invention described in Patent Document 1 relates to a
method of manufacturing a ribbon microphone, and more particularly to a method of
manufacturing a ribbon microphone capable of adjusting the tension of a ribbon diaphragm
while observing. Like the ribbon-type diaphragm in general, the ribbon-type diaphragm described
in Patent Document 1 has flat surfaces at both ends in the length direction, and the corrugated
unevenness continues in the middle in the length direction. It is formed. The flat end portions are
crimped between the pressure plate and the receiving plate by tightening a screw.
[0011]
However, the invention described in Patent Document 1 also has problems such as the increase
in contact resistance and the twisting of the ribbon diaphragm due to the screw tightening force
as described above, and the problems to be solved remain. In view of the above, the present
inventor has determined that the ribbon-type microphone and the ribbon-type are characterized
in that the portion sandwiched by at least the pinching members at both ends in the length
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direction of the ribbon-type diaphragm is formed unevenly in the thickness direction. Invented a
microphone unit and filed a patent application earlier. The invention according to Japanese
Patent Application No. 2007-308289 is that.
[0012]
According to the invention of the above application, by forming unevenness in the thickness
direction in portions in contact with the holding member at both ends of the ribbon diaphragm,
the microscopic contact with the holding member is strengthened. Do. As a result, the conductive
resistance can be reduced, and good acoustic characteristics can be obtained. Further, by forming
the above-mentioned unevenness, rigidity can be given to both ends of the ribbon diaphragm,
and maintenance such as assembly, replacement of the ribbon diaphragm and adjustment of
tension can be facilitated.
[0013]
According to the invention of the above application, although the contact resistance between the
ribbon diaphragm and the holding member can be reduced as described above, the contact area
is small due to the presence of the unevenness on the contact surface. There is a limit to the
reduction of the contact resistance, and the contact resistance can not be reduced to a
satisfactory level.
[0014]
Furthermore, as described above, since the ribbon diaphragm is an extremely lightweight part,
when the end of the ribbon is fixed to the electrode lead-out part, it moves with a slight air
movement or the like, and the position is not fixed. Workability was extremely bad.
[0015]
The present invention can further reduce the contact resistance between the ribbon diaphragm
and the electrode, and temporarily position the end of the ribbon in a predetermined position
when fixing the end of the ribbon to the electrode. It is an object of the present invention to
provide a ribbon type microphone unit, a method of manufacturing the same and a ribbon type
microphone capable of enhancing assembling workability without moving the ribbon with slight
air movement or the like.
[0016]
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A ribbon microphone unit according to the present invention comprises a magnet forming a
magnetic gap, a ribbon diaphragm disposed in the magnetic gap and vibrating by sound waves,
and the ribbon diaphragm vibrating in the magnetic gap. An electrode for outputting an electrical
signal to be generated, a frame for holding the magnet and the electrode, and a pinching member
for clamping and fixing both ends in the lengthwise direction of the ribbon diaphragm to the
electrode A ribbon type microphone unit, wherein the holding member is fixed to the frame, and
both ends in the lengthwise direction of the ribbon type diaphragm are crimped to the electrode,
and the electrode and the ribbon type diaphragm The most important feature is that oil and fat
containing conductive powder intervenes between the two.
[0017]
A method of manufacturing a ribbon microphone unit according to the present invention is the
method of manufacturing a ribbon microphone unit as described above, comprising the steps of:
applying a fat and oil containing conductive powder to the electrode; and a length of the ribbon
diaphragm Providing a step of placing both end portions of the direction on the fat and oil of the
electrode, and a step of sandwiching and fixing the both end portions of the ribbon diaphragm in
the length direction with the electrode and the holding member It is characterized by
[0018]
The oil and fat present between the electrode and the ribbon diaphragm attracts the ribbon
diaphragm by surface tension, and temporarily holds the end of the ribbon diaphragm on the
electrode.
Therefore, even if the air moves, the ribbon diaphragm does not move during the assembly
process, and the workability of assembling the ribbon microphone unit can be enhanced.
Since fats and oils contain conductive powder, even if there is a gap between the electrode and
the ribbon diaphragm, this gap is filled with the conductive powder, and the electrical contact
area between the electrode and the ribbon diaphragm is determined. The resistance can be
increased to reduce the connection resistance between the electrode and the ribbon diaphragm.
Therefore, the sensitivity of the ribbon microphone unit and the ribbon microphone using the
same can be improved and good acoustic characteristics can be obtained.
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[0019]
Hereinafter, embodiments of a ribbon microphone unit, a method of manufacturing the same,
and a ribbon microphone according to the present invention will be described with reference to
the drawings.
The same reference numerals as in the prior art shown in FIGS. 10 to 12 denote the same parts.
[0020]
1 to 7 show an embodiment of a method of manufacturing a ribbon microphone unit according
to the present invention, and FIGS. 1 to 3 show the first step, FIG. 4 shows the next step, FIG. FIG.
7 further shows the next step.
The illustrated ribbon microphone unit includes a frame 7, a magnet, an electrode 12, a terminal
plate 9, a holding member 81, a screw 10, and a ribbon diaphragm 5. The frame 7 is formed in a
rectangular frame shape long in the longitudinal direction, and screw holes for fixing to the
microphone case 1 described later are formed at four corners. Similar to the conventional
example shown in FIG. 8, a pair of permanent magnets are fixed to the inner surface of the frame
7 on both sides along the long side direction with a predetermined distance between both
permanent magnets. The depiction of the permanent magnet is omitted in FIG. The frame 7 is
made of a magnetic material and functions as a yoke, and constitutes a magnetic circuit which
comes out of the permanent magnet and returns to the permanent magnet. The magnetization
directions of the pair of permanent magnets are the same. Therefore, a parallel magnetic field is
formed between the permanent magnets, and the ribbon diaphragm 5 is disposed in the parallel
magnetic field.
[0021]
The ribbon diaphragm 5 has an elongated band shape as shown in FIG. 2 and FIG. 3 and the like,
and continues in both sides of the corrugated central portion 52 formed in the central portion in
the longitudinal direction. It comprises the waveform connecting portion 51 formed and the both
end portions 54 formed at both ends in the longitudinal direction of the ribbon diaphragm 5
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following the waveform connecting portion 51. The waveform center portion 52 and the
waveform linking portion 51 are formed in different waveforms as follows. The waveform central
portion 52 is formed in a waveform in the longitudinal direction of the diaphragm 5, as in the
waveform intermediate portion 52 in the conventional example shown in FIG. The waveform
connecting portion 51 of the ribbon diaphragm 5 is also formed in the width direction of the
diaphragm 5, similarly to the waveform end 51 in the conventional example shown in FIG.
[0022]
Both end portions 54 of the ribbon diaphragm 5 may be formed in a flat plate shape, or may be
formed in an uneven shape in the thickness direction. The unevenness of the both end portions
54 may be a triangular wave unevenness formed by alternately bending at constant intervals.
The direction of the line drawn by the crests and valleys of the triangular wave may be in the
longitudinal direction in order to give rigidity to both ends of the ribbon diaphragm 5. However,
the unevenness of the both end portions 54 is not limited to the regular and linear unevenness,
but may be irregular unevenness, curvilinear unevenness, or a plurality of discontinuous
unevenness. By forming asperities at the both end portions 54, the rigidity or stiffness of the
both end portions 54 can be strongly maintained at the time of assembly of the ribbon
diaphragm 5 or at the time of maintenance such as replacement or adjustment of tension. , Can
improve the workability of assembly and maintenance.
[0023]
Both end portions 54 of the ribbon diaphragm 5 are crimped to the electrodes 12 of the frame 7
and are electrically connected to the electrodes 12. The electrodes 12 are electrically insulated
from the frame 7 and fixed on one side near the longitudinal ends of the frame 7. The electrode 8
is fixed in a rectangular shape with its longitudinal direction oriented in the width direction of
the frame 7, and in a direction perpendicular to the longitudinal direction of the electrode 12,
thus across the electrode 12 in the width direction, both ends of the ribbon diaphragm 5 The
portion 54 is mounted on the electrode 12. A holding member 81 is placed on the end portion
54 of the ribbon diaphragm 5 on each of the electrodes 12. The pinching member 81 has
substantially the same planar shape as the electrode 8, and the pinching member 81 is crimped
to the electrode 12 by tightening both ends in the longitudinal direction of the pinching member
81 with the screws 10. The end 54 of the ribbon diaphragm 5 is held between the holding
members 81. Each of the screws 10 passes through the hole of the frame 7 and the hole formed
at the end of the electrode 12 in the longitudinal direction, and is screwed into the screw hole
formed at the end of the sandwiching member 81, thereby the electrode 12 The holding member
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81 is crimped to the Two screws for fastening one holding member 81 to one electrode 12 are
disposed at positions separated from the ribbon diaphragm 5 and sandwiching the ribbon
diaphragm 5 in the width direction.
[0024]
The most characteristic feature of the embodiment of the ribbon microphone unit according to
the present invention is that the surface of the electrode 12 fixed to both ends in the longitudinal
direction of the frame 7 is specified as shown by hatching in FIG. The oil or fat 85 containing a
conductive powder is applied to the region, and the oil or fat 85 containing a conductive powder
is interposed between the electrode 12 and the ribbon diaphragm 81. The application area of the
fat and oil 85 may be at least within the area where the end 54 of the ribbon diaphragm 81
crosses the electrode 12.
[0025]
Next, an embodiment of a method of manufacturing the ribbon microphone unit will be
described. As shown in FIGS. 1 to 3, first, a fat and oil 85 containing a conductive powder is
applied to a predetermined region of the surface of the electrode 12 at both ends in the
longitudinal direction of the frame 7. For example, nanocarbon particles can be used as the
conductive powder. In this example, a liquid material in which nano-sized carbon ultrafine
particles are mixed with squalane oil is known as a contact conduction agent, and the contact
conduction agent is applied by a brush.
[0026]
Next, as shown in FIGS. 4 and 5, the ribbon diaphragm 5 is positioned so that both ends 54 cross
the electrode 12 integral with the frame 7 and placed on the electrodes 12 at both ends. As a
result, the fat and oil 85 intervenes between the electrode 12 and the ribbon diaphragm 5, and
the surface tension of the fat and oil 85 causes the both ends 54 of the ribbon diaphragm 5 to be
adsorbed to the fat and oil 85, respectively. Therefore, it is difficult to displace even if stress is
applied to the ribbon diaphragm 5, and the viscosity of the oil makes it difficult to slip the ribbon
diaphragm 5, and the ribbon diaphragm 5 does not move due to the movement of air, that is, air.
. In addition, since the ribbon diaphragm 5 is temporarily held by the frame 7, the positioning of
the ribbon diaphragm 5 with respect to the frame 7 is easy, and the fixing process described
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below becomes extremely easy. Can improve the workability of assembly and maintenance.
[0027]
Next, the position of the ribbon diaphragm 5 with respect to the frame 7 is finely adjusted, and
both ends 54 of the ribbon diaphragm 5 are fixed to the electrodes 12 by screws 10 as shown in
FIG. The screw 10 passes through the hole formed in the frame 7 and the hole formed in the
electrode 12, and is screwed and tightened into the screw hole formed in the holding member
81. As a result, the pinching member 81 is crimped toward the electrode 12, and the respective
end portions 54 of the ribbon diaphragm 5 are pinched between the electrode 12 and the
pinching member 81. The longitudinal ends of the electrodes 12 and the holding members 81
are tightened by screws 10, respectively.
[0028]
Before the electrodes 12 and the holding members 81 are finally crimped, the tension of the
ribbon diaphragm 5 is appropriately adjusted. If the screw 10 is loosened and the pressing force
by the holding member 81 is loosened, the tension of the ribbon diaphragm 5 is loosened. If the
pressing force by one of the holding members 81 is released and one of the ribbon diaphragms 5
is pulled outward, tension can be applied to the ribbon diaphragm 5. If the screw 10 is tightened
with the ribbon diaphragm 5 given a suitable tension, the pinching members 81 press the
respective ends 54 of the ribbon diaphragm 5 against the electrodes 12 and fix the ribbon
diaphragm 5. be able to. After the electrodes 12 and the holding members 81 are finally crimped
to fix the ribbon diaphragm 5, as shown in FIG. 7, unnecessary portions of both ends 54 of the
ribbon diaphragm 5 are removed. The manufacture of one ribbon microphone unit is completed.
[0029]
The ribbon microphone unit as described above becomes a ribbon microphone by incorporating
it into a microphone case. In the ribbon microphone, a tubular microphone case constitutes a
casing of the microphone, and in the casing, the ribbon microphone unit is assembled via a
suitable support member. The microphone unit is covered by a microphone case, and a portion of
the microphone case corresponding to the microphone unit is opened to guide sound waves to
the microphone unit, and the open portion is covered with a metal mesh or the like. The proximal
end portion of the microphone case is a connector portion for connecting a microphone cable for
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leading an output signal of the microphone to an external circuit.
[0030]
According to the ribbon-type microphone unit according to the present invention described
above, the method of manufacturing the same, and the ribbon-type microphone, the fat and oil
85 containing the conductive powder intervenes between the electrode 12 and the ribbon
diaphragm 5. By the surface tension of 85, both ends 54 of the ribbon diaphragm 5 are adsorbed
to the oil 85, and the diaphragm 5 is temporarily positioned on the frame 7. Therefore, as
described above, the workability at the time of assembly and maintenance of the ribbon
microphone unit and the ribbon microphone is improved.
[0031]
Further, since the fats and oils 85 contain conductive powder of fine particles, even if a gap is
generated between the electrode 12 and the ribbon diaphragm 5, the gap is filled with the
conductive powder, and the electrode 12 and the ribbon vibration are The contact area with the
plate 5 is increased, and the connection resistance can be reduced. As a result, the sensitivity and
acoustic characteristics as a microphone are improved. By forming irregularities in the thickness
direction at both ends of the ribbon diaphragm 5, the rigidity of both ends of the ribbon
diaphragm 5 can be enhanced, and the workability at the time of assembly and maintenance can
be enhanced. A gap is generated between the diaphragm 5 and the diaphragm 5. However, even
in such a case, since the conductive powder of the fat and oil 85 fills the gap between the
electrode 12 and the ribbon diaphragm 5, the connection resistance can be reduced.
Furthermore, even when the unevenness in the thickness direction is not formed at both ends of
the ribbon diaphragm 5, a gap may be generated between the electrode 12 and the diaphragm 5
due to the bending of the holding member 81 with respect to the electrode 12. However, also in
this case, since the conductive powder of the fat and oil 85 fills the gap, the connection
resistance can be reduced.
[0032]
It is an Example of the manufacturing method of the ribbon type microphone unit concerning
this invention, and is a front view which shows the flame | frame in a 1st process. It is a front
view showing an example of a ribbon type diaphragm applied to the present invention. It is a side
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view which shows the aspect in the said 1st process of the structural member used for the
Example of the said invention. It is an embodiment of the manufacturing method of the abovementioned ribbon type microphone unit, and is a top view showing the mode of the frame and
diaphragm in the 2nd process. It is a side view which shows the aspect of the component in the
said 2nd process. It is an embodiment of the manufacturing method of the above-mentioned
ribbon type microphone unit, and is a side view showing the mode of the component in the 3rd
process. It is a side view which is an Example of the manufacturing method of the said ribbon
type microphone unit, and shows the aspect of the structural member in a 4th process. The
example of the conventional ribbon type microphone unit is shown, (a) is a top view, (b) is a
partial cross section side view. It is a cross-sectional view which shows the structure of the
terminal part of the said prior art example. It is a longitudinal cross-sectional view of the terminal
part of the said prior art example.
Explanation of sign
[0033]
Reference Signs List 5 ribbon type diaphragm 7 frame 10 screw 12 terminal 52 ribbon middle
portion 54 ribbon longitudinal end portion 81 pinching member 85 grease
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