JP3475479B2 - microphone - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone.

[0002]

2. Description of the Related Art In a microphone, in order to reduce touch noise generated by various vibrations such as vibrations when a user holds a grip, a vibration isolation mechanism for suppressing transmission of vibrations to an internal microphone unit. Is installed. A rubber material is usually used as the vibration isolation mechanism, and is arranged as shown in FIG. 9A or 9B, for example.

In FIG. 9, reference numeral 100 denotes a grip, 101 denotes a microphone unit, and a voice coil attached to a diaphragm is arranged in a gap between a yoke portion and a magnet to form an acoustic-electric conversion portion. Further, 102 is a cavity, and this space is formed by a vibration-proof rubber or a cavity case. Reference numeral 103 denotes an anti-vibration rubber, which is interposed when the microphone unit 101 and the cavity 102 are arranged in the grip 100 as shown in the figure, and the anti-vibration rubber 103 reduces vibration transmitted from the grip 100. I am trying.

[0004]

However, there is a problem in that such an antivibration mechanism cannot provide a practically sufficient effect, that is, it cannot be an effective means for eliminating touch noise. In other words, this anti-vibration mechanism absorbs vibrations due to the internal loss of the anti-vibration rubber 103, but cannot absorb low-frequency vibrations satisfactorily, and this is transmitted to the microphone unit and output as noise. Was there.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a microphone having a simple structure and realizing a good vibration damping function.

For this reason, the voice coil attached to the diaphragm is arranged in the gap between the yoke portion and the magnet, and the microphone unit constituting the acoustic-electrical conversion portion is connected to the microphone outer casing via the anti-vibration rubber. In the microphone installed inside the grip to be formed,
The anti-vibration rubber has a bottom surface portion which is hermetically sealed in a thick shape.

In addition, the voice coil attached to the diaphragm is arranged in the gap between the yoke portion and the magnet, and the microphone unit constituting the acoustic-electrical conversion portion is densely packed.
In a microphone held in a closed cavity case and mounted inside a grip forming a microphone casing, a thick rubber vibration isolator is attached to the bottom surface of the cavity case on the bottom surface of the cavity case.
Be attached non-contact .

In these structures, the portion forming the cavity space in the anti-vibration rubber or the cavity case and the portion in contact with the grip in the anti-vibration rubber or the cavity case are connected by the flange portion to form the cavity space. So that it does not touch the grip.

[0009]

The low-vibration component can be effectively absorbed by providing a thick-walled portion on the vibration-proof rubber or by attaching a thick-walled vibration-proof rubber to the cavity case to form a relatively heavy-weight portion. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First to fifth embodiments of the microphone of the present invention will be described below with reference to FIGS.

1 to 3 show the first embodiment,
FIG. 3 shows a state in which a part of the microphone is cut away, and 1 indicates the entire microphone. The microphone 1 has an upper sound collecting part 2 and a grip part 3,
A connector portion 4 is connected to a lower portion of the grip portion 3 so that an audio signal collected by the connector portion 4 is transmitted to a device such as a microphone amplifier or a mixer (not shown).

In the sound collecting section 2, 2a is a wire mesh mounted on the outermost surface, and 2b is a screen section mounted inside thereof. Further, 2c is a joint portion integrally formed with the wire netting 2a, and a screw groove to be fitted with the screw groove of the grip portion 3 is formed. Reference numeral 5 is a cushion belt attached around the sound collecting unit 2.

A substrate 6, for example, is arranged inside the grip portion 3, and a switch 7 for turning on / off the microphone 1 is connected to, for example, a circuit or a printed line on the substrate. 8 is a lead wire, 9 is a connector, and the sound collecting unit 2
The audio signal from the microphone unit 10 mounted inside the circuit is supplied to the circuit on the board 6 through the lead wire 8 and the connector 9, and is output through the connector portion 4 when the switch 7 is in the ON state. It is designed to be done.

For example, the microphone unit 10 mounted inside the sound collecting unit 2 as described above is constructed as shown in FIGS. FIG. 1 is a cross-sectional view of the microphone unit 10 attached to the grip portion 3, and FIG. 2 is a perspective view of only the microphone unit 10.

In these figures, 11 is a screen unit, 12 is an equalizer to which the screen unit 11 is attached, 13 is a diaphragm ring, 14 is a diaphragm, 15 is a voice coil, 16 is a magnet, 17 is a yoke, 18 is a plate, 19 is a cavity case, 2
Reference numeral 0 denotes a resistor made of, for example, compressed urethane, 21 denotes a directional resistor made of papillon paper or the like attached to the peripheral surface of the cavity case 19, and 22 denotes a vibration isolating rubber. The cavity case 19 is made of, for example, butyl rubber or resin (for example, ABS resin). Also, anti-vibration rubber 22
For example, butyl rubber is suitable.

The equalizer 12 is formed in a substantially cylindrical shape in which the upper and lower parts of the cylinder are partitioned by the middle plate portion 12e.
The screen unit 11 is attached to the inside of the cylinder on the upper surface side of e and the middle plate portion 1
A required number of openings 12a are formed in 2e. The opening 12a is an opening for transmitting the sound pressure taken in through the screen unit 11 to the lower diaphragm 14.

As shown in FIG. 2, a pair of terminal portions 12b is provided on the peripheral surface of the equalizer 12, and the equalizer 12 is provided between the pair of terminal portions 12b.
Slits 12c are formed by cutting out the peripheral surface from below.

At the time of manufacturing the microphone unit, not only the screen unit 11 but also the diaphragm ring 13, the diaphragm 14, and the voice coil 15 are fixed to the equalizer 12 in advance by adhesion or the like. That is, as shown in FIG. 1, a diaphragm ring 13 is adhesively fixed to an inner peripheral surface 12f of the inner portion of the equalizer 12 below the middle plate portion 12e, and a diaphragm 14 is adhesively fixed to the diaphragm ring 13. Has been done. Further, the voice coil 15 is fixed to the diaphragm 14, and the diaphragm 1
It is adapted to vibrate vertically with the vertical vibration of No. 4.

As can be seen from FIG. 2, the lead wire 15a of the voice coil 15 is led out of the equalizer 12 from the slit portion 12c, and each lead wire 15a is fixed by soldering with the solder H at the terminal portion 12b. . The lead wires 8 are soldered and fixed to the respective terminal portions 12b.

After soldering in this way, if a continuity test is conducted to find that the electrical connection is proper, the soldered terminal portion 12b,
Also, the adhesive S is applied to the upper surface of the slit portion 12c, the slit portion 12c is almost closed, and the lead wire 15a is formed.
Also, the fixed terminal portion of the lead wire 8 is also covered with the adhesive S to strengthen the fixed connection state.

On the other hand, a ring-shaped plate 18 is mounted on the inner peripheral surface on the upper surface side of the substantially cylindrical yoke 17. The magnet 16 is arranged and fixed to the inner cylinder portions of the yoke 17 and the plate 18.

The cylindrical upper peripheral surface of the yoke 17 is formed as a flange portion 17d having an L-shaped cross section, and the flange portion 17d is formed with a required number of openings 17a. Then, the compressed urethane foam as the resistor 20 is arranged in the inside pocket portion obtained by making the flange portion 17d L-shaped in cross section, that is, the portion below the opening 17a.

A required number of openings 17b are also formed in the cylindrical peripheral surface portion of the yoke 17, and the openings 17b are formed.
As can be seen from FIG. 1, the yoke 1 is separated from the space between the inner peripheral portion of the yoke 17 and the outer peripheral portion of the magnet 16.
It communicates with the outside of 7.

The yoke 17 as described above is fitted and fixed in the cylindrical portion of the cavity case 19, and the cavity case 19 is also provided with an opening 19a on the outer peripheral surface thereof. York 17
Is provided at a position substantially corresponding to the opening 17b. Therefore,
When the yoke 17 is attached to the cavity case 19, the space between the inner peripheral portion of the yoke 17 and the outer peripheral portion of the magnet 16 communicates with the outside of the cavity case 19 through the openings 17b and 19a. Become. However, a papillon paper as a resistor 21 (directional resistance) is attached to the cylindrical peripheral surface portion of the cavity case 19 where the opening 19a is provided, and therefore the yoke 1
The space portion of the gap between the inner peripheral portion of 7 and the outer peripheral portion of the magnet 16 is shielded from the outside of the microphone unit 10 by the resistor 21 (see FIG. 2). The resistor 21 may be formed of cloth or wire mesh.

Further, as can be seen from FIG. 1, the yoke 17
A damper resistor 23 is disposed between the bottom surface of the cavity and the space formed by the cavity case 19, that is, the cavity 24. Then, a required number of openings 17c are provided on the bottom surface of the yoke 17, and the openings 17c and the cavities 2 are provided.
It is separated from 4 by a damper resistor 23. Further, an opening 19b is also provided in the bottom surface portion of the cavity case 19, and the cavity 24 is communicated with the space portion of the gap between the cavity case 19 and the vibration isolating rubber 22.

At the time of manufacturing the microphone unit 10, the diaphragm 14, the magnet 14 and the yoke 17 are fixed to the cavity case 19 side as described above.
The equalizer 12 to which the voice coil 15 and the like are fixed is covered and attached from above, and the state shown in FIG. 1 is formed.

At the time of this mounting, the equalizer 12 is coated with an adhesive on the inner peripheral surface 12f of the lower cylindrical portion thereof, or on the outer peripheral surface of the flange portion 17d of the yoke 17, and then the equalizer 12 is attached. The outer peripheral surface of the flange portion 17d of the yoke 17 fits into the inner peripheral surface 12f of the lower cylinder, and is bonded and fixed by the applied adhesive. At this time, the voice coil 15 is inserted into the gap between the plate 18 fixed to the yoke 17 and the magnet 16, that is, the magnetic circuit is formed as shown in FIG.

Further, as described above, the opening 17 of the yoke 17 is provided.
a, 17b, 17c and the opening 1 of the cavity case 19
9a, 19b are provided, and openings 17b, 19
Since the resistor 21 (papillon paper) provides an appropriate resistance to the outer surface side of a, and the resistor 20 (compressed foam urethane) provides resistance to the opening 17a, the stiffness inside the yoke 17 is increased. Is adjusted,
It is possible to prevent the resonance of the diaphragm 14 from occurring.

Here, in the microphone unit 10 of the present embodiment, the vibration proof rubber 22 holds the cavity case 17, but the vibration proof rubber 22 is formed with the contact portion 22b. The microphone unit 10 is mounted in the grip 3 by pressing the inner surface 22 b of the grip 3 with pressure. And, as for this anti-vibration rubber 22, the bottom surface part is 5 to 5% of other parts.
The thick portion 22a has a thickness of about 6 times. For example, the thick portion 22a is about 5 to 6 mm. This thick part 22
By virtue of a, the transmission of the low-frequency component of vibration to the magnetic circuit part is effectively damped, and it is possible to provide a microphone with less generation of vibration noise.

Next, a second embodiment will be described with reference to FIG. In the following description of the second to fifth embodiments, the same functional parts as those in the first embodiment will be designated by the same reference numerals, and duplicate description will be avoided.

FIG. 4 is a sectional view of the microphone unit 10 of the second embodiment. In this case, the perspective view of the microphone unit 10 is the same as that shown in FIG. In this embodiment, the cavity case 19 is not provided,
As can be seen from the figure, the vibration isolating rubber 22 holds the yoke 17. Then, a cavity 24 is formed as an internal space of the anti-vibration rubber 22.

In the case of this embodiment as well, the anti-vibration rubber 22 is formed with the contact portion 22b, and the contact portion 22b is pressed against the inner surface of the grip 3 so that the microphone unit 10 is placed inside the grip 3. It is designed to be installed. The bottom surface portion of the anti-vibration rubber 22 is a thick portion 22a having a thickness of 5 to 6 times that of the other portion (for example, about 5 to 6 mm). By providing the thick portion 22a, The transmission of low-frequency components of vibration to the circuit part is effectively damped, and a microphone with less generation of vibration noise can be provided.

A third embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows the microphone unit 10 of this embodiment.
FIG. 6 is a perspective view of the microphone unit 10.

In this embodiment, the cavity case 19 made of, for example, ABS resin is provided with the opening 19a corresponding to the opening 17b of the yoke 17 on the upper side holding the yoke 17 on the inner surface thereof. The same as in the first embodiment, but on the lower side thereof, a case portion 19c forming the cavity 24 as an inner surface space and a case portion 19f having a grip attaching portion 19e are provided at the flange portion 19d.
The shape is such that they are connected via.

As can be seen from FIG. 5, the grip mounting portion 19e is fixed in a state of being sandwiched between the upper end of the grip portion 3 and the joint portion 2c integrally formed with the wire mesh 2a, whereby the microphone unit is fixed. 10 will be mounted inside the grip portion 3.

The flange portion 19d connecting the case portion 19f and the case portion 19c is made thin, and since the case portion 19f and the case portion 19c are separated from each other, the grip portion 3 and the cavity 24 are separated.
The space portion 25 is formed between them. Further, a columnar vibration damping rubber 22 having a thickness of, for example, about 5 to 6 mm is attached to the lowermost portion of the case portion 19f.

In the case of this embodiment, the cavity 24 (that is, the case portion 19c forming the cavity 24) is formed by the space portion 25 so as not to be in direct contact with the grip portion 3, and is connected to the thin flange portion 19. As a result, the vibration applied to the case portion 19f from the grip 3 is not transmitted (damped) to the case portion 19c as it is, and the vibration is transmitted from the cavity 24 to the diaphragm 14 via the damper resistor 23. Is decreasing. Further, the thick vibration-proof rubber 22 attached to the bottom surface of the cavity case 19 effectively attenuates the low-frequency vibration component.

From this, it is possible to realize a microphone with less vibration noise. Further, in this case, the anti-vibration rubber 22 has a simpler shape and is a small-sized component as compared with the above-described embodiment, so that the manufacturing cost can be reduced.

A fourth embodiment of the present invention is shown in FIG. Since this embodiment is substantially the same as the third embodiment, detailed description thereof will be omitted, but in this case, the case portion 19f of the cavity case extends further downward and contacts the entire peripheral surface of the vibration isolating rubber 22. It is done like this. That is, the anti-vibration rubber 22 is fitted in the case portion 19f. The cavity case 19 and the anti-vibration rubber 22 are more integrally joined, so that the anti-vibration effect of the anti-vibration rubber 22 becomes more effective.

FIG. 8 shows the fifth embodiment. In this embodiment, the shape of the cavity case 19 is almost the same as that of the third embodiment, but the bottom of the cavity case 19 is not provided with a vibration-proof rubber. That is, as described above, the case portion 19c and the case portion 19f are formed by the flange portion 19d.
The vibration-proofing is performed only by the vibration-proofing action of the cavity case 19 itself due to the connection shape.

With such a structure, further cost reduction can be achieved. As for the vibration damping effect, even in this embodiment, there was no problem in practical use. However, when the vibration damping rubber is not used as described above, the cavity case 19 itself increases the internal loss of vibration, so that It is preferable to mold 19 with a soft resin such as elastomer.

Although various embodiments have been described above,
Needless to say, the microphone of the present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made within the scope of the gist.

[0043]

As described above, in the microphone of the present invention, the thick rubber portion is provided in the vibration isolating rubber or the thick vibration isolating rubber is attached to the cavity case.
There is an effect that a low-frequency vibration component can be effectively absorbed, a microphone having a simple structure and low cost, and vibration noise such as touch noise is hard to occur can be realized. Also,
Since the portion forming the cavity space is not in contact with the grip, the vibration damping function can be further enhanced.

[Brief description of drawings]

FIG. 1 is a sectional view of a microphone unit according to a first embodiment of the present invention.

FIG. 2 is a perspective view of microphone units according to first and second embodiments.

FIG. 3 is an explanatory diagram of a microphone according to an embodiment.

FIG. 4 is a sectional view of a microphone unit according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a microphone unit according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a microphone unit according to a third embodiment.

FIG. 7 is a sectional view of a microphone unit according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a microphone unit according to a fifth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a conventional vibration isolation mechanism.

[Explanation of symbols] 1 microphone 2 sound collection section 3 grip part 4 Connector part 8 lead wires 9 connectors 10 microphone unit 11 screen unit 12 Equalizer 13 diaphragm ring 14 diaphragm 15 voice coils 16 magnets 17 York 18 plates 19 cavity case 19a, 19b opening 19c, 19f Case part 19d Flange part 19e Grip mounting part 20,21 resistor 22 Anti-vibration rubber 22a thick part 23 Damper resistance 24 cavities 25 Space Department

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 1/02 108

Claims (3)

(57) [Claims] 1. A microphone unit, in which a voice coil attached to a diaphragm is arranged in a gap between a yoke portion and a magnet to form an acoustic-electrical conversion portion, forms a microphone outer casing via a vibration-proof rubber. A microphone mounted inside a grip, wherein the bottom surface of the vibration-proof rubber is sealed in a thick shape. 2. A microphone unit, which constitutes an acoustic-electrical conversion section by arranging a voice coil attached to a diaphragm in a gap between a yoke section and a magnet, is hermetically sealed.
Is held in the cavity casing which, in a microphone mounted inside the grip forming a microphone outside筺, vibration damping rubber, which is a thick shape to the bottom portion of the cavity casing is non-contact with the bottom surface of the cavity casing microphone, characterized in that attached to. 3. A portion of the vibration isolating rubber or the cavity case forming the cavity space and a portion of the anti-vibration rubber or the cavity case contacting the grip are connected by a flange portion, and the portion forming the cavity space is the grip. The microphone according to claim 1 or 2, wherein the microphone is configured so as not to contact with each other.