JP2009118118

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DESCRIPTION JP2009118118
The present invention relates to a magnetic circuit assembly provided with a magnet, wherein a
tension of the diaphragm can be adjusted by configuring a detachable ribbon diaphragm
assembly, and replacing the ribbon diaphragm assembly. To obtain a ribbon-type microphone
unit which enables maintenance on the user side. A ribbon type microphone unit (10) comprising
a magnetic circuit assembly (90) provided with a magnet (30) and a ribbon type diaphragm (60),
wherein the ribbon type diaphragm (60) is a substrate on which circuit patterns (22) are formed
at both ends. 20, a bracket 50 for pressing the end of the ribbon diaphragm 60 to the circuit
pattern 22 and a screw 55 for pressing the bracket 50 toward the substrate 20 to form a
diaphragm assembly 80, and a magnetic circuit assembly The diaphragm assembly 80 is fixed to
the solid 90. [Selected figure] Figure 3
Ribbon type microphone and ribbon type microphone unit
[0001]
The present invention relates to a ribbon microphone and a ribbon microphone unit.
[0002]
The ribbon microphone mainly comprises a magnet for forming a magnetic field and a ribbon
diaphragm.
The magnets are disposed on both sides of the ribbon diaphragm, and a magnetic field is formed
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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]
The ribbon microphone is mass control, and the lower reproduction limit can be
electroacoustically converted to a lower frequency as the resonance frequency of the ribbon
diaphragm is lower. However, when the resonance frequency of the ribbon diaphragm is too low,
the ribbon diaphragm is easily moved to contact the magnetic pole forming the magnetic field
when wind is applied to the ribbon diaphragm or vibration is applied. It causes problems such as
For this reason, when attaching the ribbon diaphragm, it is necessary to mutually pull both ends
in the longitudinal direction with an appropriate force, fix the ends in a state in which tension is
appropriately applied, and raise the resonance frequency to an appropriate frequency.
[0004]
Therefore, in the manufacturing process or adjustment process of the conventional ribbon
microphone, the operator gently blows the ribbon diaphragm, and visually observes and confirms
the degree of deflection of the ribbon diaphragm at that time. It was adjusted to the tension of As
described above, aluminum foil is suitable for the ribbon diaphragm of the ribbon microphone.
However, the aluminum foil is extremely thin and lightweight, and may be torn when stretched
while adjusting the tension. Therefore, the failure of the product largely depends on the skill of
the worker, and the skill is required to stably manufacture a good ribbon microphone.
[0005]
Although the present invention relates to a ribbon microphone, the structure is similar to that of
a ribbon speaker. The ribbon type speaker vibrates the ribbon type diaphragm to generate sound
in cooperation with a magnetic field generated by passing a signal current to the ribbon type
diaphragm and a magnet. The invention described in the patent document related to the present
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invention will be described below, including a ribbon speaker.
[0006]
The invention described in Patent Document 1 relates to a tension adjustment method of a
ribbon diaphragm of a ribbon microphone. This conventional ribbon microphone unit includes a
yoke formed in a rectangular frame shape, and a ribbon diaphragm disposed along the
longitudinal direction of the yoke at the center in the width direction of the yoke. The yoke
integrally has a receiving plate near both ends in the length direction, and a pressing plate is
disposed on the lower surface side of these receiving plates. The pressing plates are respectively
fixed to the receiving plates by tightening the screws. The screw is adjusted to the extent that the
ribbon diaphragm is lightly held, the ribbon diaphragm is vibrated by the vibration means, the
tension of the ribbon diaphragm is adjusted while observing the amplitude, and the screw is
tightened. , And a ribbon diaphragm is fixed. Since the above-mentioned screw is used as the
fixing means of the ribbon diaphragm, tension adjustment of the ribbon diaphragm can be
repeated.
[0007]
The invention described in Patent Document 2 relates to a method of assembling a diaphragm
assembly including a ribbon diaphragm for a ribbon speaker. This conventional example
comprises a ribbon diaphragm wound in a roll shape, a magazine component having a slit formed
in the longitudinal direction and an adhesive layer formed on the surface, and a pressure contact
roller wider than the slit. There is. The magazine component is made of a nonmagnetic aluminum
material, and a ribbon diaphragm is disposed in parallel with the longitudinal direction of the slit.
In the method of assembling the diaphragm assembly, while moving the magazine component in
the longitudinal direction, the ribbon diaphragm is continuously pressed to the magazine
component via the adhesive layer by the pressure contact of the pressure roller, and the ribbon is
vibrated. Both longitudinal ends of the plate are adhered to the magazine component. According
to the diaphragm assembly assembling method of this prior art, the failure rate of the ribbon
diaphragm generated by manual assembly is reduced, and the diaphragm assembly is
automatically and continuously formed. It can be manufactured.
[0008]
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The invention described in Patent Document 3 relates to a ribbon speaker. This conventional
example is composed of a yoke obtained by dividing a magnetic gap forming portion of a yoke
which constitutes a magnetic circuit together with a magnet, and a vibration system assembly
including a ribbon diaphragm. The vibration system assembly functions as a spacer which does
not bring the divided yokes into contact with each other by interposing the non-magnetic
material, for example, an aluminum material, between the divided yokes. Further, by interposing
the vibration system assembly in the parallel magnetic field generated between the divided
yokes, good frequency characteristics can be obtained. A signal current is caused to flow through
the diaphragm provided in the above-mentioned vibration system assembly to vibrate the
diaphragm to output sound. The vibration system assembly can be detached by disassembling
each of the divided yokes. Therefore, when the diaphragm is damaged, repair of the damage and
component replacement can be easily performed by attaching and detaching the vibration
system assembly.
[0009]
The invention described in Patent Document 4 relates to a ribbon speaker. While supporting both
ends in the axial direction of the ribbon diaphragm by fixed terminals, UV curable resin is applied
to the wall of the plate disposed in the magnetic gap in which the edge in the axial direction and
the ribbon diaphragm are disposed The diaphragm is attached to the inside of the magnetic gap
of the magnetic circuit by applying and reacting the ultraviolet curing resin with ultraviolet
radiation. In the case of a naturally curing adhesive, the curing time is long, and since the curing
state is unstable due to variations in curing conditions, there is a defect that affects the
performance of the ribbon diaphragm. On the other hand, the ultraviolet curable resin can be
irradiated with ultraviolet light to the portion coated with the ultraviolet curable resin, so that
there is no unevenness or variation in the cured state or curing time, and a stable cured state can
be obtained.
[0010]
JP-A-2006-319595 JP-A-57-171900 JP-A-57-163892 JP-A-57-119989
[0011]
The ribbon diaphragm of the ribbon microphone is easily slackened by strong wind or impact,
and if the slack amount exceeds a certain level, it is necessary to readjust the tension and further
replace it.
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According to the invention described in Patent Document 1, it is possible to readjust the tension
of the ribbon diaphragm by using a screw for fixing the ribbon diaphragm. However, according
to the conventional ribbon-type microphone including the invention described in Patent
Document 1, the ribbon-type diaphragm is directly fixed to the magnetic circuit assembly to
constitute the microphone unit. Otherwise, there is a disadvantage that maintenance can not be
performed. Therefore, when it is necessary to adjust or replace the ribbon diaphragm, each
microphone must be sent to the manufacturer.
[0012]
In the inventions described in Patent Documents 2 to 4, as a method of bonding the ribbon
diaphragm to the magazine component or the plate, bonding using an adhesive,
thermocompression bonding, or ultraviolet curable resin is used. These inventions relate to a
diaphragm of a ribbon type speaker, and even when applied to a diaphragm made of an
extremely thin material such as aluminum foil as in the present invention, it functions as a
diaphragm that receives sound waves and vibrates. It is impossible. Even if this is applied to the
diaphragm of the ribbon microphone referring to the configuration of the conventional ribbon
speaker, it is difficult to remove the ribbon diaphragm once it is bonded to a plate or the like. For
example, in the case of bonding a diaphragm using a naturally-curing adhesive or the like, the
bonded portion needs to be subjected to heat treatment again to be removed, and in some cases,
the diaphragm itself may be broken. Furthermore, in the ribbon type speaker, once the
diaphragm is incorporated, there is no need to readjust the tension, and there is no idea that the
ribbon type diaphragm is replaced.
[0013]
The present invention takes into consideration the concept of constructing a ribbon diaphragm
assembly detachable from a magnetic circuit assembly in view of the prior art as described
above, and forms a ribbon diaphragm assembly from a magnetic circuit assembly. Ribbon
microphones and ribbons that allow the user to adjust the tension of the diaphragm and to
perform maintenance on the ribbon diaphragm by replacing the ribbon diaphragm assembly. It is
an object of the present invention to provide a microphone unit.
[0014]
The present invention is a ribbon type microphone unit comprising: a magnetic circuit assembly
including a magnet and having a magnetic gap; and a ribbon diaphragm disposed in the magnetic
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gap and vibrated by an acoustic wave, the magnetic circuit assembly including the magnetic
circuit assembly Has a yoke having a window hole and a magnet fixed to the wall surface of the
window hole, and the ribbon diaphragm has a window hole and a circuit pattern is formed on
both ends of the window hole The magnetic circuit assembly comprises a ribbon diaphragm
assembly together with a substrate, a bracket for crimping the end of the ribbon diaphragm to
the circuit pattern, and a screw for crimping the bracket toward the substrate. The most
important feature is that the ribbon diaphragm assembly is fixed to the above.
[0015]
The ribbon-type microphone unit according to the present invention is composed of the abovementioned magnetic circuit assembly and the above-mentioned ribbon-type diaphragm assembly
(hereinafter also referred to as "diaphragm assembly"), each of which is detachable.
With this structure, the user can remove the diaphragm assembly from the magnetic circuit
assembly and perform maintenance such as adjustment and replacement of the tension of the
ribbon diaphragm.
In particular, replacement of the diaphragm assembly can be easily performed by removing the
diaphragm assembly from the magnetic circuit component and attaching a new diaphragm
assembly, and the magnetic circuit assembly is replaced There is no need. Further, the
replacement of the magnetic circuit assembly can be easily performed by removing the
diaphragm assembly from the magnetic circuit assembly. Furthermore, maintenance of only the
ribbon type diaphragm is also possible, and adjustment of tension of the ribbon type diaphragm
and / or detachment are possible by loosening the screw fixed via the above-mentioned bracket
fixing the ribbon type diaphragm. It is.
[0016]
In the ribbon microphone unit according to the present invention, a dustproof cloth or a magnet
can be attached to the window hole of the diaphragm assembly. With this structure, the
dustproof cloth prevents entry of fine iron powder or foreign matter that is going to enter the
inside of the microphone unit from the outside of the ribbon microphone, or adhesion to the
magnet prevents problems from occurring. can do.
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[0017]
Hereinafter, embodiments of a ribbon microphone and a ribbon microphone unit according to
the present invention will be described with reference to the drawings. In FIG. 1, reference
numeral 1 indicates a microphone case. The microphone case 1 has a cylindrical shape, and two
rectangular window holes long in the longitudinal direction from the central portion to the front
end portion on the wall surface from the center portion to the tip end portion at the positions
facing each other. It is formed side by side in the direction. A mesh 2 is attached to these window
holes. Audio from the outside of the microphone case 1 passes through the mesh 2 and reaches a
microphone unit disposed inside the microphone case 1. In FIG. 2, reference numeral 10 denotes
the microphone unit. The microphone unit 10 is installed at a central position in the inside of the
microphone case 1 and corresponding to the attachment position of the mesh 2.
[0018]
As shown in FIGS. 3A, 3B and 3C, the microphone unit 10 is composed of a diaphragm assembly
indicated by reference numeral 80 and a magnetic circuit assembly indicated by reference
numeral 90. The diaphragm assembly 80 is composed of a substrate 20, a spacer 40, a ribbon
diaphragm 60, a metal fitting 50, and a screw 55, as shown in FIG. The substrate 20 has a
rectangular shape, and a rectangular window hole 24 long in the longitudinal direction is formed
at the center. A ribbon diaphragm 60 is disposed longitudinally of the window hole 24. The width
of the ribbon diaphragm 60 is smaller than the width of the window hole 24. In the vicinity of
both end portions in the longitudinal direction of the substrate 20, a rectangular circuit pattern
22 which is long in the width direction of the substrate 20 is formed. Both ends in the
longitudinal direction of the ribbon diaphragm 60 straddle the circuit pattern 22 and are fixed by
fixing means comprising a spacer 40, a metal fitting 50 and a screw 55. The fixing means will be
described later.
[0019]
In FIG. 8, in the four corners on the plane of the substrate 20, holes 28 for passing screws are
formed in order to fix the diaphragm assembly 80 to the magnetic circuit assembly 90 using the
screws. The diaphragm assembly 80 is installed with the surface on which the ribbon diaphragm
60 is stretched facing the yoke 70 side. As shown in FIG. 5B, in the diaphragm assembly 80
viewed from the side, the metal fitting 50, the ribbon diaphragm 60, and the spacer 40 protrude
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from the surface of the substrate 20, and these members are the window holes 72 of the yoke
70. It fits in. The ribbon diaphragm 60 stretched on the diaphragm assembly 80 is positioned
within the magnetic gap of parallel flux formed by the two magnets 30 fixed to the magnetic
circuit assembly 80. As shown in FIGS. 8A and 8B, the circuit pattern 23 is also formed on the
back surface side of the surface on which the circuit pattern 22 is formed on the substrate 20.
The circuit pattern 23 has a cross shape, and the hole 26 penetrating the circuit pattern 22
penetrates the circuit pattern 23, and the connection portion of the electrode is located in the
circuit pattern 23. The connection portion of the electrode is connected to an external circuit.
[0020]
FIG. 10 shows the spacer. The spacer 40 is made of a conductive material, is rectangular, and has
holes 42 through which screws pass at both ends. The metal fitting 50 shown in FIG. 11 is made
of a conductive material, is rectangular, and has holes 52 at both ends for passing screws. The
thickness of the bracket 50 is slightly thicker than the thickness of the spacer 40.
[0021]
The fixing means of the ribbon diaphragm 60 will be described with reference to FIGS. 6 and 7.
Holes 26 are formed in the substrate 20 at both ends in the longitudinal direction of the circuit
pattern 22 so as to penetrate the circuit pattern 22. Screws 55 are inserted into these holes 26
from the lower side in FIG. A spacer 40 is disposed on the top surface of the circuit pattern 22, a
ribbon diaphragm 60 is disposed on the top surface of the spacer 40, and a metal fitting 50 is
disposed on the top surface thereof. The screw 55 is inserted into the hole 42 of the spacer 40
from the lower side to the upper side. By fixing the screw 55 in the screw hole 52 of the fitting
50, the ribbon diaphragm 60 and the spacer 40 are crimped and fixed between the screw 55 and
the fitting 50.
[0022]
Next, a specific configuration of the magnetic circuit assembly 90 will be described. As shown in
FIG. 4, the magnetic circuit assembly 90 comprises a yoke 70 and a magnet 30. The yoke 70 is
rectangular and has an appropriate thickness, and a rectangular window hole 72 which is long in
the lengthwise direction is formed at the center, and parallel to the lengthwise direction of the
window hole 72, opposing inner wall surfaces are provided. Each of the magnets 30 is fixed. As
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shown in FIG. 9, the magnet 30 has an elongated prismatic shape and is magnetized in the width
direction. An air gap is formed between the magnets 30 facing each other. The opposing surfaces
of the magnets 30 are arranged to have different magnetic poles. The yoke 70 and the pair of
magnets 30 form a magnetic circuit, and the air gap between the magnets 30 forms a magnetic
gap of parallel magnetic flux. The magnet 30 is made of a neodymium material and generates a
relatively strong magnetic force.
[0023]
In FIG. 4B, screw holes 74 are respectively formed at the four corners of the plane of the yoke
70, and the screw is also formed at both ends in the longitudinal direction of the window hole 72
and at both ends in the width direction of the yoke 70. Holes 76 are formed at four locations,
respectively. As shown in FIG. 13A, screw holes 78 are formed in the front of the yoke 70 in the
vicinity of both end portions in the longitudinal direction. The screw holes 74 and 78 are for
fixing to the microphone case, and the screw holes 76 are for fixing the diaphragm assembly 80
described later.
[0024]
In the embodiment of the microphone unit 10 shown in FIG. 3, two diaphragm assemblies 80 are
used for one magnetic circuit assembly 90. The two diaphragm assemblies 80 are configured to
sandwich the magnetic circuit assembly 90 from both sides with the back surfaces thereof facing
each other. The yoke 70 constituting the magnetic circuit assembly 90 has a rectangular shape
and a suitable thickness as described above. The magnetic circuit assembly 90 and the
diaphragm assembly 80 have substantially the same dimension in the width direction, and the
longitudinal dimension is longer in the magnetic circuit assembly 90 than in the diaphragm
assembly 80. The magnetic circuit assembly 90 is fixed to the microphone case 1 using a fixing
method described later.
[0025]
A method of maintaining the ribbon diaphragm 60 will be described. The diaphragm assembly
80 is removed from the microphone unit 10, the screw 55 is loosened, and the ribbon diaphragm
60 is removed. The ribbon diaphragm for replacement is prepared longer than the length usually
used. In the substrate 20, the spacer 40 is disposed on the circuit pattern 22, and the screw 55 is
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inserted into the hole 26 of the circuit pattern and the hole 42 of the spacer 40 from the lower
side of the substrate 20. The ribbon diaphragm 60 vertically crosses the window hole 24 along
the central axis of the substrate 20 in the longitudinal direction, and is disposed on the upper
surfaces of the spacers 40 at the longitudinal ends of the substrate 20. Loosen and tighten the
metal fittings 50 from the top of the ribbon diaphragm 60, adjust the tension while pulling the
remaining part of the ribbon diaphragm 60 extending in the left and right direction from each
spacer in the left and right direction, and tighten the metal fittings 50. The remainder of the
diaphragm 60 is cut away. Again, the diaphragm assembly 80 is attached to the magnetic circuit
assembly 90. If the diaphragm assembly 80 itself needs to be replaced, it is possible to remove
the diaphragm assembly 80 from the microphone unit 10 and replace the diaphragm assembly
80 together.
[0026]
FIG. 14 shows a modification of the substrate constituting the diaphragm assembly. In FIG. 14, a
substrate 120 is obtained by forming a plurality of circular holes 122 along the longitudinal
center line, instead of the window holes 24 of the substrate 20 in the embodiment described
above. With such a configuration, the area of the hole at the opposing position of the ribbon
diaphragm 60 can be limited to generate acoustic resonance, and the frequency characteristic
can be extended to a high region. Thereby, high frequency sound waves can also be converted
into electrical signals. In the illustrated example, a plurality of circular holes are assumed, but
this form may not be employed. It is sufficient that the window holes of the substrate have holes,
the number, the size, and the position of the shape that causes the acoustic resonance.
[0027]
When a magnet 30 having a strong magnetic force such as a neodymium material is used, fine
iron powder, foreign matter, etc. may be attached, and the desired acoustic characteristics of the
ribbon microphone are lost to cause a failure. . FIGS. 15 and 16 show an example in which a
countermeasure is taken to avoid the cause of the failure. In FIG. 15, reference numeral 130
denotes a dustproof cloth. As illustrated, it is also possible to attach the mesh-like dustproof cloth
130 at a position where the window hole 24 of the substrate 20 is closed.
[0028]
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The example shown in FIG. 16 shows an example using a magnet for iron powder adsorption as a
dustproof measure. As shown in the figure, an elongated square-prism shaped iron powder
adsorbing magnet 140 is fixed at a position closing the window hole 24 from the back side of the
surface of the substrate 20 on which the ribbon diaphragm 60 is stretched. The iron powder
adsorption magnet 140 assumes a weak magnetic force with respect to the magnet 30 of the
magnetic circuit assembly 90, and has magnetic poles facing each other in the width direction so
as not to displace the parallel magnetic field in the magnetic gap as much as possible. There is.
By installing the dustproof cloth 130 and the iron powder adsorption magnet 140, it is possible
to prevent fine iron powder and foreign matter from entering the inside of the microphone unit
10 from the outside of the ribbon microphone.
[0029]
As described above, according to the ribbon-type microphone unit of the present invention, the
diaphragm assembly and the magnetic circuit assembly, each having a detachable structure,
allow the user side of the ribbon-type diaphragm to be maintained. It is possible to easily carry
out the readjustment of the tension and the replacement of the diaphragm assembly or the
magnetic circuit assembly. In addition, when two diaphragm assemblies having a ribbon
diaphragm are used, the sensitivity of the microphone can be improved by connecting each of
them in series. Furthermore, according to the embodiment of the present invention, by attaching
a dustproof cloth, an iron powder adsorption magnet, or the like to the window hole of the
substrate, it is possible to prevent fine iron powder and foreign matter from entering the inside
of the microphone unit. Can.
[0030]
If the ribbon microphone unit described above is incorporated in a microphone case to constitute
a ribbon microphone, it is possible to obtain a ribbon microphone having the above-described
effects.
[0031]
BRIEF DESCRIPTION OF THE DRAWINGS (a) is a schematic plan view which shows the Example
of the ribbon type microphone concerning this invention, (b) is a schematic front view.
(A) which shows the ribbon type microphone concerning the said Example is a plane sectional
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view, (b) is a front sectional view, (c) is a side sectional view. (A) which shows the microphone
unit in the said Example is sectional drawing seen from the front, (b) is a top view, (c) is sectional
drawing seen from the side. (A) is a front view which shows the magnetic circuit assembly in the
said Example, (b) is a top view, (c) is sectional drawing seen from the side. (A) which shows the
diaphragm assembly in the said Example is a top view, (b) Sectional drawing seen from the side,
(c) is a bottom view. (A) which shows the diaphragm assembly in the said Example is an exploded
sectional view seen from the side, (b) is an exploded sectional view seen from the side. (A) which
shows the diaphragm assembly in the said Example is an exploded plan view, (b) is a top view. (A)
which shows the board ¦ substrate in the said Example is a top view, (b) is a bottom view. (A)
which shows the magnet in the said Example is a top view, (b) is a front view. (A) which shows
the spacer in the said Example is a top view, (b) is a side view. (A) which shows the metal fitting
in the said Example is a top view, (b) is a side view. (A) is a front view which shows the ribbontype diaphragm in the said Example, (b) is a top view, (c) is a side view. (A) showing the yoke in
the said Example is a front view, (b) is a top view, (c) is sectional drawing seen from the side. It is
a top view which shows the modification of the diaphragm assembly applicable to this invention.
FIG. 14 is a plan view showing another modification of the diaphragm assembly applicable to the
present invention. (A) is a top view which shows another modification of the diaphragm assembly
applicable to this invention, (b) is a side view.
Explanation of sign
[0032]
Reference Signs List 1 microphone case 2 mesh 10 microphone unit 20 substrate 22 circuit
pattern 24 window hole 30 magnet 40 spacer 50 bracket 55 screw 60 ribbon diaphragm 70
yoke 80 diaphragm assembly 90 magnetic circuit assembly 130 dustproof cloth 140 magnet for
magnet powder adsorption
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