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JP2006319595

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DESCRIPTION JP2006319595
A ribbon microphone manufacturing method capable of adjusting the tension of a ribbon
diaphragm with uniform quality and easily monitoring the vibration state of the ribbon
diaphragm without requiring skill. A ribbon microphone having magnets (11, 12) forming a
magnetic field, and a ribbon diaphragm (5) holding both end portions in the length direction and
receiving a sound wave and vibrating the ribbon diaphragm (5) to convert it into an electric
signal Manufacturing method. The ribbon diaphragm 5 is vibrated by the vibration means, and
the tension of the ribbon diaphragm is adjusted while observing the amplitude. The vibration
means is a speaker emitting a sound wave toward the ribbon diaphragm 5 or a signal source for
flowing a signal current to the ribbon diaphragm 5 and vibrating the ribbon diaphragm 5 in
cooperation with the magnetic field. It is preferable to observe the vibration of the ribbon
diaphragm by making the stroboscopic light emitting device with variable light emission period
emit light. [Selected figure] Figure 2
Ribbon microphone manufacturing method
[0001]
The present invention relates to a method of manufacturing a ribbon microphone, and more
particularly to a method of adjusting tension of a ribbon diaphragm.
[0002]
The ribbon microphone mainly comprises a magnet for forming a magnetic field, and a ribbonshaped diaphragm in which both ends in the longitudinal direction are pressed under
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appropriate tension and arranged in the magnetic field.
The ribbon diaphragm receives a sound wave and vibrates in the magnetic field, whereby a
current 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 aluminum has a
good conductivity and a low specific gravity compared to other metal materials. Further, in order
to use the thin plate as a ribbon diaphragm, it is necessary to lower the resonance frequency, so
that the gear-like formed member is pressed and bent into a bellows shape to substantially
increase the length. Accordingly, a material having good ductility and easy bending is desirable,
and aluminum is also suitable as a ribbon diaphragm from this point of view.
[0003]
As described above, most of the ribbon diaphragms used in the ribbon microphones are made of
aluminum foil, so the electrical resistance as the conductor is extremely small, for example, 0.1 to
0.2 Ω. Since the resistance is small, the level of the output signal is also small, and therefore,
usually, a step-up transformer is used to raise the signal level, which is used as the output of the
microphone.
[0004]
The bi-directional ribbon microphone is mass control, and the lower reproduction limit can be
reproduced 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, when the wind
strikes or vibration is applied to the ribbon diaphragm, the ribbon diaphragm moves easily and
contacts the magnetic pole forming the magnetic field. It causes a problem. For this reason, it is
necessary to mutually pull both ends in the longitudinal direction of the ribbon diaphragm with
an appropriate force, apply a suitable tension to the ribbon diaphragm, and raise the resonance
frequency to an appropriate frequency.
[0005]
Therefore, in the manufacturing process or adjustment process of the conventional ribbon
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microphone, the operator gently blows on the ribbon diaphragm, and visually observes and
confirms the bending condition of the ribbon diaphragm at that time, and an appropriate tension
is obtained. It was adjusted to. However, in the conventional adjustment method, the quality of
the product largely depends on the skill of the worker, and the production of a good ribbon
microphone requires skill to stably manufacture. In the case of checking whether the ribbon
diaphragm is in contact with the magnetic pole and the unevenness of the vibration as well, it is
confirmed while blowing breath on the ribbon diaphragm as described above. It is also a
primitive and skillful task.
[0006]
No patent document has been found that describes a method of adjusting the tension of the
ribbon diaphragm in the manufacturing process of the ribbon microphone as in the present
invention. However, as a prior art indirectly related to the present invention, there is a tension
adjustment method of a diaphragm for a condenser microphone (see, for example, Patent
Document 1). The invention described in Patent Document 1 relates to the application of the
present applicant, and is tensioned on the support ring so that the tension of the diaphragm can
be adjusted even after the diaphragm is tensioned on the support ring. For example, a laser
irradiator irradiates a laser beam to a part of the diaphragm to heat the diaphragm. The
diaphragm of the ribbon microphone needs to have conductivity as described above, and most of
them are made of aluminum foil, and the material is completely different from the diaphragm of
the condenser microphone, and the diaphragm is irradiated with laser light Even then, tension
adjustment can not be performed.
[0007]
JP 2004-343377
[0008]
The present invention has been made in view of the prior art as described above, and provides a
method of manufacturing a ribbon microphone capable of adjusting tension of a ribbon
diaphragm with uniform quality easily and without requiring skill. The purpose is
The present invention also makes it possible to easily monitor the vibration state of the ribbon
diaphragm, and to manufacture a ribbon microphone capable of adjusting the tension of the
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ribbon diaphragm with uniform quality without requiring skill. Intended to provide a method.
[0009]
The present invention has a magnet that forms a magnetic field, and a ribbon diaphragm that is
given appropriate tension to hold both end portions in the length direction, and receives an
acoustic wave to vibrate the ribbon diaphragm, thereby generating an electric signal. In the
method of manufacturing a ribbon microphone, the main feature is to adjust the tension of the
ribbon diaphragm while vibrating the ribbon diaphragm by the vibration means and observing
the amplitude thereof. The vibration means may be a speaker that emits an acoustic wave toward
the ribbon diaphragm, or a signal source that causes a signal current to flow to the ribbon
diaphragm and vibrate the ribbon diaphragm in cooperation with a magnetic field. It is also good.
The stroboscopic light emitting device with variable light emission cycle may be made to emit
light to observe the vibration of the ribbon diaphragm.
[0010]
The ribbon diaphragm is vibrated by the vibrating means, and the operator can adjust the tension
of the ribbon diaphragm while observing the vibration state of the ribbon diaphragm, which
facilitates the adjustment operation. By using the vibration means as a speaker or as a signal
source for vibrating the ribbon diaphragm in cooperation with a magnetic field, the ribbon
diaphragm can be vibrated continuously with stable force, The tension adjustment of the ribbon
diaphragm is further facilitated. In addition, if the tension adjustment of the ribbon diaphragm is
performed by adjusting the light emission cycle of the strobe light emitter and the vibration cycle
of the ribbon diaphragm to coincide with each other, the tension adjustment position of the
ribbon diaphragm is determined. It can be clearly recognized and tension adjustment becomes
easier.
[0011]
Hereinafter, an embodiment of a method of manufacturing a ribbon microphone according to the
present invention will be described with reference to the drawings. 1 and 2 show the main part
of a ribbon microphone to which the manufacturing method according to the present invention
can be applied, that is, a ribbon diaphragm 5, and magnets 11 and 12 forming a magnetic field
for positioning the diaphragm 5 in a magnetic field. An example of the microphone unit part
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provided with is shown. In FIG. 1 and FIG. 2, a ribbon-shaped diaphragm 5 is disposed along the
longitudinal direction of the yoke 1 at the center in the width direction of the yoke 1 formed in a
rectangular frame shape. The yoke 1 integrally has receiving plates 8 and 9 near both
longitudinal end portions, and pressing plates 2 and 3 are disposed on the lower surface side of
the receiving plates 8 and 9. The receiving plates 8 and 9 and the pressing plates 2 and 3 are
rectangular long in the width direction of the yoke 1, and the pressing plate 2 is tightened by the
screw 14 and the other pressing plate 3 is tightened by the screw 15 It is supposed to be fixed.
[0012]
The circuit board 6 and the one end portion 51 of the ribbon diaphragm 5 are interposed
between the receiving plate 8 and the pressing plate 2, and the circuit board 7 and the ribbon
vibrating plate 5 are disposed between the receiving plate 9 and the pressing plate 3. The end 52
intervenes. Both end portions 51 and 52 of the ribbon diaphragm 5 are sandwiched by the lower
surfaces of the circuit boards 6 and 7 and the upper surfaces of the pressing plates 2 and 3. If
the screw 14 or 15 is loosened and the pressing force by the pressure plate 2 or 3 is released,
the tension of the ribbon diaphragm 5 is loosened, and at least one of the end portions 51 and 52
of the ribbon diaphragm 5 is outward If it is pulled, tension can be applied to the ribbon
diaphragm 5. If the screw 14 or 15 is tightened while the ribbon diaphragm 5 is given a suitable
tension, the pressure plate 2 or the pressure plate 3 may be at least one of the end portions 51
and 52 of the ribbon diaphragm 5 receiving plate 8 Alternatively, the ribbon diaphragm 5 can be
fixed by pressing it against the receiving plate 9.
[0013]
A predetermined circuit pattern is formed on the circuit boards 6 and 7, both ends 51 and 52 of
the ribbon diaphragm 5 are pressed against the circuit pattern, and the circuit pattern of the
circuit board 6 and one end of the ribbon diaphragm 5 The portion 51 is electrically conducted,
and the circuit pattern of the circuit board 7 and the other end 52 of the ribbon diaphragm 5 are
electrically conducted. Parts of the circuit boards 6 and 7 protrude outward from both ends in
the longitudinal direction of the yoke 1, and electrodes 61 and 71 are formed on these
protruding parts. The electrodes 61 and 71 function as output terminals for audio signals. Also,
as will be described later, it may be used as a signal input terminal at the time of tension
adjustment of the ribbon diaphragm 5.
[0014]
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5
The ribbon diaphragm 5 is not particularly limited as long as it is a material having conductivity
and light specific gravity, but as a material meeting such conditions, there is aluminum foil as
seen in most conventional ribbon microphones. Aluminum foil is also used in the embodiment.
The portion of the ribbon diaphragm 5 that vibrates in response to the sound wave, that is, the
portion existing between the pair of receiving plates 8 and 9 is formed in a wave shape. The
direction of the crests and troughs of the wave is the width direction of the ribbon diaphragm 5,
and the crests and troughs are formed at constant intervals. Permanent magnets 11 and 12 are
fixed to the yoke 1 in parallel along the longitudinal direction of the ribbon diaphragm 5 and on
both sides of the ribbon diaphragm 5. An appropriate slit-like gap exists between the permanent
magnets 11 and 12 and the side surface of the ribbon diaphragm 5. The permanent magnets 11
and 12 are magnetized so that the N pole and the S pole are formed in the width direction, and
the main part of the ribbon diaphragm 5 formed in a wave shape in the magnetic field formed
between the magnets 11 and 12 Exists.
[0015]
The main part of the ribbon diaphragm 5 vibrates according to the sound wave when it receives
the sound wave. The ribbon-shaped diaphragm 5, which is a conductor, vibrates in the magnetic
field, so that the ribbon-shaped diaphragm 5 crosses the magnetic field to generate a signal
current, and this signal current is generated at both ends 51, 52 of the ribbon-shaped diaphragm
5 The signal is output through the electrodes 61 and 71 of the substrates 6 and 7.
[0016]
A method of manufacturing the ribbon microphone configured as described above, more
specifically, a method of adjusting the tension of the ribbon diaphragm 5 will be described below.
The adjustment method according to the present invention is characterized in that the ribbon
diaphragm 5 is vibrated by the vibration means, and the tension of the ribbon diaphragm 5 is
adjusted while observing the amplitude. One example of the vibration means is a speaker
disposed to face the ribbon diaphragm 5. When a sound wave is emitted from the speaker toward
the ribbon diaphragm 5, the ribbon diaphragm 5 vibrates according to the sound wave. The
ribbon diaphragm 5 vibrates at the same frequency as the frequency of the sound wave emitted
from the speaker. The amplitude of the ribbon diaphragm 5 changes as the frequency of the
sound wave is continuously changed. The frequency of the sound wave at which the amplitude is
maximum is the resonance frequency of the ribbon diaphragm 5. The resonance frequency
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changes in accordance with the tension applied to the ribbon diaphragm 5. The higher the
tension, the higher the resonant frequency. Therefore, the target resonance frequency of the
ribbon diaphragm 5 is set, and the speaker is driven by a signal having the same frequency as the
resonance frequency. The tension of the ribbon diaphragm 5 is adjusted so that the amplitude of
the ribbon diaphragm 5 vibrating upon receiving the sound wave from the speaker is maximized.
The tension adjustment of the ribbon diaphragm 5 is performed with the screw 14 or 15
loosened as described above, and after adjustment, the screw 14 or screw 15 is tightened and the
ribbon diaphragm 5 is held by both pressing plates 2 and 3. The both end portions 51, 52 of the
second embodiment are pressed against the receiving plates 8, 9 and substantially fixed.
[0017]
As another example of the above-mentioned vibration means, a signal source is made to flow a
signal current to the ribbon diaphragm 5 and vibrate the ribbon diaphragm 5 in cooperation with
the magnetic field formed by the magnets 11, 12. There is a bowl. The signal source can change
the frequency of the signal generated. A signal generated by the signal source flows from the
electrodes 61 and 71 of the circuit boards 6 and 7 to the ribbon diaphragm 5 through both ends
51 and 52 of the ribbon diaphragm 5. As a current flows through the ribbon diaphragm 5
present in the magnetic field, the ribbon diaphragm 5 vibrates according to the frequency of the
current. Also in this case, a target resonance frequency of the ribbon diaphragm 5 is set, and a
signal having the same frequency as the resonance frequency is supplied from the signal source
to the ribbon diaphragm 5. In this state, the tension is adjusted so that the amplitude of the
ribbon diaphragm 5 is maximized, and at this adjustment position, both ends in the longitudinal
direction of the ribbon diaphragm 5 are fixed means, that is, the screws 14 and 15, the pressure
plate 2 Press down on the support plates 8 and 9 in 3 to fix.
[0018]
By the way, even if the tension is adjusted so that the amplitude of the ribbon diaphragm 5 is
maximized, it is difficult to determine where the maximum amplitude is by merely observing the
ribbon diaphragm 5 directly. Therefore, a strobe light emitter may be used so that the maximum
amplitude can be easily determined. Some strobe light emitters can emit light in a very short time
and can emit light continuously in a very short time interval. As described above, while the
ribbon diaphragm 5 is vibrated by the vibration means, the strobe light emitter is periodically
emitted to illuminate the ribbon diaphragm 5 with the light of the strobe. The light emission
cycle of the strobe light emitter is variable, and the light emission cycle is set to a cycle
corresponding to the resonance frequency of the ribbon diaphragm 5 as a target. On the other
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hand, the frequency of the signal for vibrating the ribbon diaphragm 5 by the vibration means is
also set to the target resonance frequency. When the ribbon diaphragm 5 is observed while
changing the tension of the ribbon diaphragm 5 under this setting, it appears as if the ribbon
diaphragm 5 is stopped when synchronized with the light emission cycle of the strobe light
emitter. Since the state is a state where the resonance frequency of the ribbon diaphragm 5 is
adjusted to the target resonance frequency, the ribbon diaphragm 5 is fixed at the position of the
tension as described above.
[0019]
The vibration of the ribbon diaphragm 5 is observed using a strobe light emitter, and the light
emission period of the strobe light emitter 5 is set to a period corresponding to the resonance
frequency of the ribbon diaphragm 5 as a target. If the ribbon diaphragm 5 looks as if it were
stopped, the ribbon diaphragm 5 is adjusted to the target tension. Since it is possible to
determine whether or not the ribbon diaphragm 5 looks as if it does not require skill without
requiring skill, there is an advantage that anyone can make uniform adjustment without variation
in adjustment. . Further, by setting the ribbon diaphragm 5 to tension when it looks as if it is
stopped, the vibration frequency at that time is the resonance frequency, and the amplitude at
that time becomes the maximum amplitude. Since the state of vibration at this maximum
amplitude can be observed by strobe light, at this time it is observed whether the ribbon
diaphragm 5 is not in contact with a magnetic pole or the like and whether it is unevenly
vibrated. Is also possible, and has the advantage of being easy to find defects.
[0020]
According to the present invention, it is effective as a method of adjusting the tension of a ribbon
diaphragm in a ribbon microphone, and is also effective in finding a defect in the ribbon
diaphragm. The method of manufacturing a ribbon microphone according to the present
invention is not limited to the ribbon microphone, and may be widely used as a method of
adjusting a diaphragm.
[0021]
It is a side view which omits one part component and shows an important section of an example
of a ribbon microphone which can apply a manufacturing method concerning the present
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invention. It is a bottom view which shows the principal part of the example of the said ribbon
microphone.
Explanation of sign
[0022]
Reference Signs List 2 holding plate as fixing means 3 holding plate as fixing means 5 ribbon
diaphragm 8 receiving plate as fixing means 9 receiving plate as fixing means 11 magnet 12
magnet 14 screw as fixing means screw 15 as fixing means
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