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JP2008187311

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DESCRIPTION JP2008187311
The present invention provides a ribbon microphone unit and a ribbon microphone that reduce
the occurrence of failure due to deformation of an edge portion of a ribbon diaphragm and
reduce the generation of incidental sound due to abnormal resonance of the edge portion. A
ribbon microphone unit 1 at least includes a support 2, a pair of magnets 4 and 4 attached to the
support to form a magnetic field, and a ribbon diaphragm 3 disposed in the magnetic field of the
magnet. The ribbon diaphragm is composed of a main vibrating portion 3a that receives an
acoustic wave and vibrates in a magnetic field, and edge portions 3b and 3b positioned on both
ends in the longitudinal direction of the main vibrating portion. Each edge portion has a second
forming portion bent in a bellows shape along the lateral direction. The diaphragm operation
suppression unit 10 is formed on at least a part of the second forming unit. [Selected figure]
Figure 1
Ribbon microphone unit and ribbon microphone
[0001]
The present invention relates to a ribbon microphone unit using a movable diaphragm formed in
a ribbon shape (hereinafter referred to as "ribbon diaphragm"), and a ribbon microphone
including the ribbon microphone unit, and more specifically, to a ribbon diaphragm Technology
for suppressing the characteristic deterioration of the
[0002]
There is a ribbon microphone using a ribbon type diaphragm as a kind of magnetoelectric type
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microphone which collects sound using electromotive force by vibration of a diaphragm.
This ribbon microphone has long been disrespected because of its low sensitivity, but its sound
quality is soft and there is no sense of discomfort, and it has been used to collect voice, Japanese
musical instruments, string musical instruments, etc. Has attracted attention in the field.
[0003]
Such a ribbon microphone comprises a ribbon microphone unit as shown in FIG. 4 and FIG. FIG. 4
is a front view showing an example of a conventional ribbon microphone unit. 5 is a longitudinal
cross-sectional view taken along the line II-II indicated by a dashed-dotted line in FIG. 4 and 5,
the ribbon microphone unit 101 comprises a support 102, a pair of magnets 104 and 104
attached to the support 102 for forming a magnetic field, and a ribbon disposed in the magnetic
field of the magnets 104. The main component is to provide a shaped diaphragm 103.
[0004]
Further, in the ribbon microphone unit, the ribbon diaphragm is loosely tensioned while the one
end side and the other end side in the length direction are respectively pressed and an
appropriate tension is given. Therefore, while a ribbon microphone equipped with such a ribbon
microphone unit is light and easy to move, and is vulnerable to noise such as human breath and
mechanical vibration from the outside, it can be used for a wide range of sounds from low to high
It has the advantage of being able to pick up, that is, having a wide frequency band. Then, in the
ribbon microphone, when the ribbon diaphragm receives a sound wave and vibrates in the
magnetic field, electricity flows in the ribbon diaphragm and the sound wave is converted into an
electric signal.
[0005]
For such a ribbon diaphragm, a thin conductor with a thickness of several microns, which has
been long and thin, is conventionally used. Specifically, aluminum foil is often used as a material
of the ribbon diaphragm. This aluminum is suitable as a ribbon diaphragm of a ribbon
microphone because it has good conductivity and light specific gravity compared to other metal
materials.
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[0006]
In addition, since the bi-directional ribbon microphone is mass control, the lower reproduction
limit can be set to a lower frequency as the resonance frequency of the diaphragm is lower.
However, if this resonance frequency is too low, problems such as contact with the magnetic pole
will occur due to wind and vibration. Then, when a strong impact or wind pressure is applied to
the ribbon diaphragm, the ribbon diaphragm is plastically deformed (stretched) to cause a failure.
[0007]
In the case of using a conductive thin plate such as aluminum foil as the material of the ribbon
diaphragm, it is necessary to lower the resonant frequency. Therefore, in general, a bending
process as shown in FIG. 5 is performed. In FIG. 5, the ribbon diaphragm 103 forms a forming
portion 114 which is bent in a bellows-like manner along the short direction (width direction) to
increase the substantial length. Such a forming portion 114 can be relatively easily formed, for
example, by pressing and bending a ribbon-like conductive thin plate against a gear-like forming
member or the like. However, it is not preferable that the ribbon diaphragm subjected to such a
bending process is easily stretched as a whole. In particular, the central portion of the ribbon
diaphragm is easily stretched.
[0008]
Then, as shown in FIG. 6, what gave bending processing so that the main part of a ribbon-type
diaphragm might not be extended is proposed. In FIG. 6, the ribbon diaphragm 123 has a first
forming portion 133 which is bent in a bellows shape along the length direction in a main
vibrating portion 123a which receives an acoustic wave and vibrates in a magnetic field. Further,
the edge portions 123b and 123b respectively located at both ends in the length direction of the
main vibrating portion 123a have second forming portions 134 which are bent in a bellows
shape along the short direction (width direction). By having such a first forming portion 133, the
main central portion of the ribbon diaphragm does not extend in the longitudinal direction, so
that the occurrence of a failure can be prevented to some extent. As an example thereof, one in
which a ribbon-shaped diaphragm is subjected to press molding processing has been proposed
(see Patent Document 1).
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[0009]
However, although the edge portion 123b is formed so that the main vibrating portion 123a can
move easily, it is easily deformed plastically. When the edge portion 123 b plastically deforms,
the ribbon microphone breaks down. Further, the edge portion 123 b is more likely to cause
abnormal resonance when the sound wave is applied, as compared with the main vibrating
portion 123 a. This abnormal resonance is the same as the abnormal resonance of the sub-dome
of the dynamic microphone. As a result, an accompanying sound is generated due to the material
of the ribbon diaphragm. Since the material of the ribbon diaphragm is aluminum, this incidental
sound is the same as the sound when the aluminum foil is bent or when the end is lightly hit.
Therefore, at present, for the ribbon microphone, improvement of plastic deformation and
abnormal resonance at the edge portion of the ribbon diaphragm is desired. Japanese Patent
Application Laid-Open No. 59-15395
[0010]
The present invention has been made in view of the above circumstances, and it is a ribbon
microphone that reduces the occurrence of failure due to deformation of the edge portion of the
ribbon diaphragm and reduces the occurrence of incidental sound due to abnormal resonance of
the edge portion. It is an object to provide a unit and a ribbon microphone.
[0011]
The ribbon microphone unit according to the present invention comprises at least a pair of
magnets for forming a magnetic field, and a ribbon diaphragm disposed in the magnetic field of
the magnet, and the ribbon diaphragm receives an acoustic wave to enter the magnetic field.
Forming of a main vibration portion vibrating at the edge and edge portions respectively located
on both end sides in the length direction of the main vibration portion, and the respective edge
portions are subjected to a bending process in a bellows shape along the short direction It is a
ribbon microphone unit which has a part, and it is mainly characterized in forming a diaphragm
operation control part in at least one copy of the above-mentioned forming part.
[0012]
In the ribbon microphone unit of the present invention, at least a part of the forming portion
provided on the edge portions respectively positioned on both ends in the longitudinal direction
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of the ribbon diaphragm disposed in the magnetic field formed by the pair of magnets The
motion suppression unit is formed.
Therefore, even if a strong impact from the outside or an air flow such as wind pressure is
applied to the ribbon diaphragm, the diaphragm operation suppressing portion reduces the
stress applied to the edge portion and suppresses deformation of the edge portion.
Further, when a sound wave is applied to the ribbon diaphragm, the diaphragm operation
suppressing portion can alleviate the vibration applied to the edge portion, and can suppress the
resonance of the edge portion. Therefore, it is possible to provide a ribbon microphone unit and a
ribbon microphone that reduce the occurrence of a failure due to the deformation of the edge
portion of the ribbon diaphragm and reduce the generation of the accompanying sound due to
the abnormal resonance of the edge portion.
[0013]
Hereinafter, an embodiment of a ribbon microphone unit according to the present invention will
be described in detail based on the drawings. FIG. 1 is a front view showing an example of a
ribbon microphone unit of the present invention. Moreover, FIG. 2 is a longitudinal crosssectional view along the I-I line shown with a dashed-dotted line in FIG. As shown in FIGS. 1 and
2, the ribbon microphone unit 1 according to this embodiment includes a plate-like support 2, a
pair of magnets 4 and 4 attached to the support 2, and the magnets 4 and 4. And at least a
ribbon diaphragm 3 disposed in the magnetic field. The support 2 has a slit-like window in the
longitudinal direction, and the magnets 4 and 4 are disposed along the side edge of the window,
and a uniform magnetic field is formed between the magnets 4 and 4. The ribbon diaphragm 3 is
disposed so that the vibration direction thereof cuts the magnetic field formed between the
magnets 4 and 4.
[0014]
Further, as shown in FIG. 3, the ribbon-shaped diaphragm 3 receives a sound wave and vibrates
in a magnetic field, and a main vibrating portion 3a and edge portions 3b located on both ends in
the lengthwise direction of the main vibrating portion 3a. , 3b. In FIG. 3, the main vibrating
portion 3a of the vibrating plate 3 has a first forming portion 13 which is bent in a bellows shape
along the length direction. On the other hand, each of the edge portions 3b, 3b has a second
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forming portion 14 which is bent in a bellows-like manner along the lateral direction (width
direction). In both the first forming portion 13 and the second forming portion 14, peaks and
valleys formed by bending are formed at a constant interval. By forming the first forming portion
13 and the second forming portion 14 as described above, the ribbon diaphragm 3 can be made
easy to vibrate in a magnetic field by receiving a sound wave, and the main vibration portion 3a
It is possible to suppress the possibility of extending in the longitudinal direction.
[0015]
Then, the ribbon microphone unit 1 of the present invention is characterized in that the
diaphragm operation suppression unit 10 is formed in at least a part of the second forming unit
14 in the edge 3 b. The diaphragm operation suppression unit 10 may be formed on only one
side of the edge portion 3 b or may be formed on both sides.
[0016]
The support 2 is a plate-like fixing member to which the magnet 4 is attached. The support 2
may be a so-called yoke (a yoke). Examples of the material of the support 2 in this case include
soft magnetic materials such as iron, dull iron, silicon iron and amorphous. In this manner, by
making the support 2 a yoke, the magnetic resistance of the magnetic circuit of the magnets 4
and 4 can be reduced, and the magnetic flux density of the magnetic field formed between the
magnets 4 and 4 can be increased. By oscillating the ribbon diaphragm 3, the power appearing at
both ends of the ribbon diaphragm 3 can be increased.
[0017]
The ribbon diaphragm 3 is a movable diaphragm formed in a ribbon shape. The ribbon
diaphragm 3 is not particularly limited as long as it is a material having conductivity and a light
specific gravity. Materials meeting such conditions include aluminum foil as can be found in most
conventional ribbon microphones. Therefore, the aluminum foil is used also in this embodiment.
[0018]
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The ribbon diaphragm 3 has one end side sandwiched by a pair of first sandwiching members
11a and 11b formed of a conductive member, and the other end side formed of a pair of
conductive members. It is pinched by the two pinching members 12a and 12b. The first holding
members 11a and 11b and the second holding members 12a and 12b sandwich and support the
ribbon diaphragm 3 in a sandwich form to facilitate attachment and fixation to the support 2,
and the ribbon It also doubles as a spacer for reliably arranging the diaphragm 3 in the magnetic
field of the magnet 4.
[0019]
Further, a first output terminal 5 made of a conductive member is interposed between the
support 2 and one of the first holding members 11a, and the support 2 and one of the second
holding members 12a are provided. A second output terminal 6 made of a conductive member is
interposed between the two. The first output terminal 5 and the second output terminal 6 each
output an audio signal generated by the ribbon diaphragm 3.
[0020]
Furthermore, an electrically insulating first pressing member 7 is disposed to overlap the other
first clamping member 11b so as to cover it from above, and the other second clamping member
12b is also covered from above A second pressing member 8 made of an insulating member is
disposed to overlap so as to cover it. The first pressing member 7 fixes and fixes one end side of
the ribbon diaphragm 3 to the support 2 by tightening with a screw 17, and the second holding
member 8 fixes by using a screw 18. Thus, the other end of the ribbon diaphragm 3 is attached
and fixed to the support 2.
[0021]
Therefore, the first output terminal 5, one first holding member 11a, one end of the ribbon
diaphragm 3, the other first holding member 11b, and the first pressing member 7 are
sequentially arranged at one end of the support 2. It is arranged repeatedly. On the other hand,
on the other end side of the support 2, the second output terminal 6, one second holding
member 12a, the other end of the ribbon diaphragm 3, the other second holding member 12b,
the second pressing member 8, Are arranged in order. Since both the first holding members 11a
and 11b and the first output terminal 5 are made of conductive members, either one of the first
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holding members 11a or the other first holding member 11b You may comprise integrally so
that it may serve as one output terminal. Further, since both the second holding members 12a
and 12b and the second output terminal 6 are also members having conductivity, either one of
the second holding member 12a or the other second holding member 12b You may comprise
integrally so that it may serve as two output terminals. As a result, the number of parts can be
reduced, the structure can be simplified, and the assembly can be facilitated.
[0022]
The magnets 4 and 4 are permanent magnets joined to the support 2 respectively. The magnets
4 and 4 are magnetized such that an N pole and an S pole are formed in the width direction. The
magnets 4 and 4 are disposed in parallel along the length direction of the ribbon diaphragm 3
and are opposed to both sides of the ribbon diaphragm 3, respectively. Further, between the
magnets 4 and 4 and the side surface of the ribbon diaphragm 3, an appropriate slit-like window
hole exists. Accordingly, a magnetic field is formed in the space in which the magnets 4 and 4
face each other, and at least the main vibrating portion 3a of the ribbon diaphragm 3 is disposed
in the magnetic field in parallel with the magnetic field direction. Then, when receiving the sound
wave, the ribbon diaphragm 3 vibrates in the direction crossing the magnetic field, and generates
an electric signal according to the sound wave.
[0023]
The diaphragm operation suppression unit 10 may cover the surface of the second forming unit
14. As a result, the diaphragm operation suppression unit 10 can be easily formed in the second
forming unit 14 without directly processing the second forming unit 14 itself such as
deformation or a notch.
[0024]
Moreover, as for the said diaphragm operation suppression part 10, it is desirable in it being a
coating film. That is, as a method of covering the surface of the second forming portion 14, there
is also a means of attaching a film, a sheet material or the like to the edge portion 3 b. However,
the coating film formed by means of applying the resin agent can cover the second forming
portion 14 easily, thinly and with good adhesion. In addition, it is possible to suppress the
operation of the diaphragm and adjust the diaphragm operation suppression unit 10 by adjusting
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the thickness of the coating film, the site to be applied, and the like.
[0025]
Furthermore, it is more preferable that the diaphragm operation suppression unit 10 has an
elastic restoring force. Thereby, the diaphragm motion suppression unit 10 can effectively
suppress the plastic deformation of the edge portion 3 b without interfering with the operation of
the main vibrating portion 3 a of the ribbon diaphragm 3.
[0026]
The diaphragm operation suppression unit 10 as described above can be formed by applying a
polymer material. As a material meeting the conditions of the diaphragm operation suppression
unit 10, for example, silicone rubber, in particular, room temperature vulcanizable silicone
rubber (silicon RTV rubber) may be mentioned. As silicon RTV (Room Temperature Vulcanizing)
rubber, for example, KE3475 manufactured by Shin-Etsu Chemical Co., Ltd. can be mentioned.
[0027]
In the ribbon microphone unit 1 configured as described above, the main vibration portion 3a of
the ribbon diaphragm 3 vibrates according to the sound wave when receiving the sound wave.
When the ribbon diaphragm 3 as a conductor vibrates in the magnetic field, the ribbon
diaphragm 3 crosses the magnetic field and a signal current is generated, and the signal current
is more than that of the both ends of the ribbon diaphragm 3. It is outputted through the output
terminal 5 and the second output terminal 6. In the ribbon microphone unit 1, even if a strong
impact or air flow such as wind pressure is applied to the ribbon diaphragm 3 from the outside,
the diaphragm operation suppression unit 10 relieves the stress applied to the edge 3b and the
edge 3b Suppress plastic deformation. Further, when a sound wave is applied to the ribbon
diaphragm 3, the diaphragm operation suppression unit 10 mitigates the vibration applied to the
edge portion 3b and suppresses the abnormal resonance of the edge portion 3b.
[0028]
Therefore, the ribbon microphone unit 1 configured as described above is incorporated into a
microphone case provided with a head case made of punched metal and a metal mesh that takes
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in sound waves and protects internal components, thereby causing deformation of the edge
portion. It is possible to provide a ribbon microphone that reduces the occurrence of failure and
reduces the generation of incidental sound due to abnormal resonance of the edge portion.
[0029]
It is a front view showing the example of the ribbon microphone unit concerning the present
invention.
It is a longitudinal cross-sectional view along the I-I line shown in FIG. It is a perspective view
showing an example of a ribbon type diaphragm applicable to a ribbon microphone unit
concerning the present invention. It is a front view which shows an example of the conventional
ribbon microphone unit. It is a longitudinal cross-sectional view along the II-II line shown in FIG.
It is a perspective view explaining the structure of the conventional ribbon diaphragm.
Explanation of sign
[0030]
DESCRIPTION OF SYMBOLS 1 ribbon microphone unit 2 support 3 ribbon diaphragm 3a main
vibration part 3b edge part 4 magnet 5 1st output terminal 6 2nd output terminal 7 1st pressing
member 8 2nd pressing member 10 diaphragm operation suppression part 11a, 11b First
holding member 12a, 12b Second holding member 13 first forming portion 14 second forming
portion
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