JP5033408B2 - Dynamic microphone - Google Patents

Description

  The present invention relates to a dynamic microphone, and more particularly, to a technique for effectively preventing disconnection of a voice coil lead wire when the diaphragm is at the maximum displacement.

  As shown in the sectional view of FIG. 5, the dynamic microphone includes a diaphragm 10 and a magnetic generation circuit 20 as a basic configuration.

  The diaphragm 10 includes a center dome 10a and a sub dome 10b integrally connected around the center dome 10a, and is entirely made of a synthetic resin film that is extremely thin (for example, about 9 μm). A voice coil 11 is attached to the boundary between the center dome 10a and the sub dome 10b.

  The magnetism generating circuit 20 is magnetically connected to a permanent magnet 21, a center pole piece 22 provided on one pole side of the permanent magnet 21, and a cup-shaped yoke 23 on the other pole side of the permanent magnet 21. The ring yoke 24 is connected. The center pole piece 22 and the ring yoke 24 are arranged coaxially, and a magnetic gap G having a uniform magnetic flux density is formed between them.

  The voice coil 11 is made of, for example, a copper wire of about 30 μm having an insulating film, and is fixed to the boundary portion between the center dome 10a and the sub dome 10b with an adhesive as a power generating coil while being wound at a predetermined number of turns. .

  The magnetism generating circuit 20 is housed in a unit holder (not shown), and the diaphragm 10 is fixed at the peripheral edge of the sub dome to the unit holder so that the voice coil 11 vibrates in the magnetic gap G.

  The lead wire 11a of the voice coil 11 is wired along the upper surface of the ring yoke 24 on the inner surface side of the sub dome 10b from the boundary portion between the center dome 10a and the sub dome 10b. It is pulled out to the board and soldered to a predetermined terminal of the relay terminal board.

  The voice coil 11 vibrates in the gap G together with the diaphragm 10 due to the incoming sound wave, whereby the voice coil 11 generates power, and an electric signal thereby is output as a voice signal via a voice output circuit (not shown).

  In many cases, the dynamic microphone is used as a vocal microphone that picks up normal sound, but it is also used for picking up an instrument from the viewpoint of sound quality. In the case of musical instruments, some design changes are made.

  As an example, in the case of bass drum applications, in consideration of the frequency characteristics of the bass drum, it is common that the stiffness of the diaphragm 10 is small (the diaphragm is soft), and the voice coil 11 is designed to be heavy. .

  Since the bass microphone dynamic microphone is designed to have a low resonance frequency in this way, the amplitude near the resonance frequency during actual sound collection is extremely large, for example, about ± 0.5 mm. There is.

  Therefore, as shown in FIG. 6, when the amplitude is large, the lead wire 11 a of the voice coil 11 is strongly pressed against the ring yoke 24, and particularly, the lead wire 11 a is frequently disconnected due to the edge of the ring yoke 24.

  In order to prevent this, in the invention described in Patent Document 1 (first prior art), the center pole piece side facing the center dome of the diaphragm has an arc convex toward the center dome side, and the maximum of the diaphragm A displacement regulating member that regulates the amount of displacement is provided.

  As another method, in the invention described in Patent Document 2 (second prior art), an elastic adhesive is used as an impact reducing agent at the root portion (root portion) of the lead wire that contacts the edge of the ring yoke when the amplitude is large. Is applied.

JP 2005-260306 A JP 2006-19791 A

  The first and second prior arts are effective when the microphone is used at a certain distance (for example, about 10 cm) from the sound source. However, in the case of the usage of voice percussion in recent years, a situation occurs in which the disconnection of the lead wire of the voice coil cannot be prevented with the above-described conventional technology.

  Voice percussion is a performance technique that expresses the timbre of a percussion instrument by voice. Blowing the microphone strongly, or covering the back of the head case with your hand, it will shock the microphone with strong sound pressure. A sound output such as a percussion instrument is obtained by adding a sound wave to the sound.

  In such a usage, since the sound source is very close and a strong shocking pressure is applied to the diaphragm, the diaphragm is not linearly displaced. Therefore, even if the diaphragm displacement restricting member is provided on the center pole piece side as in the first prior art, the lead wire of the voice coil may be strongly pressed against the ring yoke and broken due to the collapse of the sub dome. .

  The same can be said for the second prior art. In this case, disconnection can be prevented by using a hard-curing resin instead of the elastic adhesive. However, when a hard-curing resin is used, another problem occurs that the movement of the diaphragm is hindered and the frequency response is deteriorated.

  The disconnection of the lead wire of the voice coil occurs when the lead wire is sandwiched between the diaphragm and the ring yoke with a strong force, and may be caused not only by the voice percussion method but also by a drop impact or the like.

  Accordingly, an object of the present invention is to provide a simple and reliable disconnection prevention means that can reliably prevent disconnection of the lead wire of the voice coil even if the diaphragm is greatly displaced due to, for example, voice percussion usage or drop impact. It is in providing the dynamic microphone provided with.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a diaphragm in which a voice coil is attached to the boundary between the center dome and the sub dome, a ring yoke connected to one pole side of the permanent magnet, and the other A magnetic generation circuit having a magnetic gap formed by a center pole piece connected to the pole side of the magnetic coil, and the voice coil is supported through the diaphragm so as to vibrate within the magnetic gap, and the voice coil in a dynamic microphone lead wire is drawn out are wired along the upper surface of the ring yoke from the boundary portion, on the upper surface of the ring yoke a groove in which the lead wire is wired is provided, the the groove is formed between the tape adhered at predetermined intervals on the upper surface of the ring yoke It is a symptom.

The invention described in claim 2 is connected to the diaphragm having the voice coil attached to the boundary between the center dome and the sub dome, the ring yoke connected to one pole side of the permanent magnet, and the other pole side. And a magnetic generation circuit having a magnetic gap formed by a center pole piece, wherein the voice coil is supported through the diaphragm so as to vibrate within the magnetic gap, and the lead wire of the voice coil is connected to the boundary portion. In the dynamic microphone wired along the upper surface of the ring yoke and drawn out to the outside, a groove for wiring the lead wire is provided on the upper surface side of the ring yoke, The groove is formed between printed layers applied to the upper surface of the ring yoke at a predetermined interval.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the groove has a depth at least greater than the diameter of the lead wire and a width that the sub dome cannot enter. It is characterized by being.

  According to the present invention, on the upper surface side of the ring yoke, a groove (preferably a groove having a depth larger than the diameter of the lead line and having a width that the sub dome cannot enter) is provided. As a result, even if the diaphragm is greatly displaced and the sub dome is shocked against the ring yoke, the lead wire is released into the groove and is not disconnected.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 is a plan view partially including a cross section showing a dynamic microphone according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a right side view of the ring yoke in FIG. It is a right view of the ring yoke similar to FIG. 3 which shows another embodiment of this. In the description of this embodiment, the same reference numerals are used for components that may be regarded as the same as or the same as those of the conventional example described with reference to FIG.

  As shown in FIGS. 1 and 2, the dynamic microphone of the present invention also includes a diaphragm 10 and a magnetism generating circuit 20 as a basic configuration. These configurations are the same as those shown in FIG. It may be the same as the conventional example.

  That is, the diaphragm 10 includes a center dome 10a and a sub dome 10b integrally connected around the center dome 10a, and a voice coil (power generation coil) 11 is attached to the boundary portion via an adhesive. For the voice coil 11, for example, a copper wire with an insulation coating having a diameter (wire diameter) of 30 μm may be used.

  The magnetism generating circuit 20 includes a permanent magnet 21, a center pole piece 22 provided on one pole side of the permanent magnet 21, and a cup-shaped yoke 23 on the other pole side of the permanent magnet 21. A magnetically connected ring yoke 24 is provided, and a magnetic gap G having a uniform magnetic flux density is formed between the center pole piece 22 and the ring yoke 24. The cup-shaped yoke 23 and the ring yoke 24 may be integrally formed.

  The magnetism generating circuit 20 is housed and held in a unit holder (not shown), and the diaphragm 10 is supported by the unit holder at the periphery of the sub-dome 10b so that the voice coil 11 vibrates in the magnetic gap G.

  The lead wire 11a of the voice coil 11 is wired along the upper surface of the ring yoke 24 on the inner surface side of the sub dome 10b from the boundary portion between the center dome 10a and the sub dome 10b. It is pulled out to the board and soldered to a predetermined terminal of the relay terminal board.

  In the present invention, even if the diaphragm 10 is greatly displaced due to voice percussion usage, drop impact, or the like, the ring yoke 24 as shown in FIGS. A groove 30 is provided in a portion where the lead wire 11a is wired on the upper surface of the substrate.

  This groove 30 is a shock-relieving groove for escaping the lead wire 11a when the diaphragm 10 is largely displaced, and at least a depth in which a part of the lead wire 11a in the diameter direction enters is preferable. It is preferable that the depth is equivalent to the diameter of the lead wire 11a, more preferably about 0.05 mm or more deeper than the diameter of the lead wire 11a.

  Further, the width of the groove 30 (the width along the circumferential direction of the ring yoke 24) needs to be a width through which the two lead wires 11a can be passed. Since a part may be deformed and enter the groove 30, it is necessary to have a width that can prevent this. The width may be appropriately determined according to the material and thickness of the diaphragm.

  In this embodiment, the groove 30 is formed by adhering the tape 31 to the upper surface of the ring yoke 24. In this example, a C-shaped tape 31 in which a portion to become the groove 30 is cut is pasted on the upper surface of the ring yoke 24, but the two tapes 31 are embanked only on both sides of the groove 30. You may stick to.

  It is preferable that the tape 31 to be used has a certain degree of compressive strength that can resist the pressing force of the subdome 10b. Instead of the tape 31, a printing layer by silk printing or pad printing may be formed.

  According to the tape or the printed layer, it can be applied to an existing model without requiring a design change. However, as another embodiment, as shown in FIG. 4, cutting or ring yoke pressing is performed on the upper surface of the ring yoke 24. The groove 30 can also be formed directly during processing.

  Of course, in addition to the groove 30, the displacement regulating member and / or elastic adhesive of the first prior art may be used in combination.

1 is a plan view partially including a cross section showing a dynamic microphone according to the present invention. AA sectional view taken on the line AA of FIG. The right view of the ring yoke in FIG. The right view of the ring yoke similar to FIG. 3 which shows another embodiment of this invention. Sectional drawing which shows the conventional general dynamic microphone. Sectional drawing which shows the excessive displacement state of the dynamic microphone of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Diaphragm 10a Center dome 10b Sub dome 11 Voice coil 11a Lead wire 20 Magnetization circuit 21 Permanent magnet 22 Center pole piece 23 Cup-shaped yoke 24 Ring yoke 30 Groove 31 Tape 31

Claims (3)

A magnetic gap formed by a diaphragm having a voice coil attached to the boundary between the center dome and the sub dome, a ring yoke connected to one pole side of the permanent magnet, and a center pole piece connected to the other pole side The voice coil is supported through the diaphragm so as to be able to vibrate within the magnetic gap, and the lead wire of the voice coil extends from the boundary portion along the upper surface of the ring yoke. In a dynamic microphone that is wired and pulled out,
The upper surface side of the ring yoke a groove in which the lead wire is wired is provided,
The dynamic microphone according to claim 1, wherein the groove is formed between tapes attached to the upper surface of the ring yoke at a predetermined interval . A magnetic gap formed by a diaphragm having a voice coil attached to the boundary between the center dome and the sub dome, a ring yoke connected to one pole side of the permanent magnet, and a center pole piece connected to the other pole side The voice coil is supported through the diaphragm so as to be able to vibrate within the magnetic gap, and the lead wire of the voice coil extends from the boundary portion along the upper surface of the ring yoke. In a dynamic microphone that is wired and pulled out,
On the upper surface side of the ring yoke, a groove for providing the lead wire is provided,
The dynamic microphone according to claim 1, wherein the groove is formed between printed layers applied to the upper surface of the ring yoke at a predetermined interval . The groove is at least the lead wire diameter more than depth, and dynamic microphone according to claim 1 or 2, characterized in that it comprises a width that the sub-dome can not enter.

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