JPS6336781Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a microphone that prevents pop sounds in the low frequency range caused by human breath pops.By arranging a member that diffuses the breath above the diaphragm (in the direction of incidence of the breath), This prevents the diaphragm from acting directly on the diaphragm of the microcapsule.

Generally, a microphone has a microphone capsule 2 housed within a body (grip) 1, and a wind screen 3 is placed over the upper end of the microphone, as shown in FIG.
The structure is such that the audio signal is extracted from the output connector 4 at the lower end. Further, the microphone capsule 2 is configured as shown in FIG. 2, for example. That is, in FIG. 2, the magnet 15 is attached to the bottom yoke 1.
6, and the whole is housed in a centering 17. The side surface of the centering ring 17 is covered with a top yoke 18. The upper pole piece 5 of the magnet 1 protrudes from the centering 17, and a diaphragm 7 on which a voice coil 6 is attached is arranged. diaphragm 7
On top is a cover 8 that also serves as a high frequency compensation adapter.
is covered. Further, a terminal plate 10 is fixed to the bottom yoke 16 by terminal fixing screws 9. A cavity case 14 is arranged below the bottom yoke 16.

In the above-described configuration, the acoustic resistor 11 is also placed over and bonded to the sound holes 12, 12, . . . formed in the cavity case 14 and the top yoke 18, respectively.
The acoustic resistor 11 is made of felt, woven fabric with a large number of meshes, wire mesh, or the like.

In addition, the wind screen 3 has conventionally been a hemispherical wire mesh 2, as shown in cross-section in FIG.
1 and 22 are joined by a ring-shaped metal fitting 23, an internal screen 24 made of foamed plastic material or the like is placed inside the ring-shaped metal fitting 23, and a metal fitting 25 for joining with the microphone body is attached to the opening of the wire mesh 22.

It is desirable that the windscreen has good acoustic transparency considering frequency characteristics, and that disturbances in the airflow caused by wind or breath (POP) do not reach the diaphragm of the transducer. However, these are contradictory matters when it comes to the structure of the windscreen, and although the above-mentioned conventional type can be expected to have a certain effect on sound transparency and preventing disturbances in the airflow caused by wind or breath from reaching the diaphragm, ,
The effect on wind or breath was still insufficient.

This invention was made in view of the above-mentioned points, and is intended to provide a microphone that has both sound transparency and breath blocking performance.

According to this invention, this is achieved by arranging a member that diffuses the breath at a position above the diaphragm, which is the direction of incidence of the person's breath.

Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings. Here, a case will be shown in which a breath diffusing member (hereinafter referred to as a diffusing member) is built into a wind screen that is detachably attached to the microphone body.

In FIG. 4a, the windscreen 30
In this example, hemispherical wire meshes 31 and 32 are connected to ring-shaped metal fittings 3.
3, an internal screen 34 made of a foamed plastic material or the like is placed inside the wire mesh 32, and a fitting 35 for joining with the microphone body is attached to the opening of the wire mesh 32. As shown in FIG. 4b, a circular hole 34a is formed at the top of the internal screen 34, into which a circular diffusion member 36 is fitted and fixed.

The diffusion member 36 is made of, for example, an acoustically opaque plate-like body (○), a wire mesh 31, 32 (○), an acoustically transparent or translucent net-like body (with a larger number of meshes than the internal screen 34 made of foamed plastic material, etc.). Wire mesh, woven cloth), ○C Made of a material that has the property of diffusing the breath of an acoustically transparent or translucent porous sintered metal body.

The microphone is usually located on the windscreen 3
It is used with the top of the 0 facing the person's mouth. Therefore, sound and breath often enter the windscreen 30 from the top. FIG. 5 shows a diffusion member 36 in the windscreen 30 of FIG. 4a.
This figure shows the incident state of breath and sound when the device is made of an acoustic (semi-)transparent body such as a wire mesh or a porous sintered metal body. The solid arrow indicates the state of breath incidence,
The two-dot chain arrow indicates the sound incidence state. As shown in this figure, the air flow caused by the breath is in a focused state, so there is no diffraction effect like sound, and it is diffused by the diffusing member, so it no longer acts directly on the diaphragm 38 of the microphone capsule 37. It is possible to prevent popping noise caused by In addition, regardless of whether the diffusion member 36 is acoustically opaque or transparent, even if the sound is incident from the upper part of the windscreen, due to the diffraction effect, the sound will be transmitted through the portion of the internal screen 34 that has good acoustic transparency around the diffusion member 36. Since the light enters the interior and can sufficiently act on the diaphragm 38 of the microphone capsule 37, there is no problem in practical use.

6 and 7 show other embodiments of this invention. Components common to the embodiment of FIG. 4a are given the same reference numerals.

In the embodiment shown in FIG. 6, the diffusion member 40 is made up of two layers to enhance the diffusion effect.

In the embodiment of FIG. 5, a recess 34a' is formed in place of the hole at the top of the internal screen 34', and a diffusion member 41 having the same structure as the diffusion member 36 of FIG.
It is fitted and fixed. In such a configuration, the diffusion effect can be enhanced by combined use of the diffusion member 41 and the internal screen recess 34a'.

As explained above, according to this invention, a member that diffuses the breath is placed above the diaphragm, which is the direction of incidence of the breath, so it is possible to effectively prevent the popping sound caused by the breath, and also to reduce the noise. can obtain good sound transparency due to diffraction effect.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the external appearance of the microphone, Fig. 2 is a sectional view of the microphone capsule 2 in Fig. 1, Fig. 3 is a sectional view showing a conventional wind screen, and Fig. 4a is an embodiment of this invention. FIG. 4b is a sectional view showing the wind screen 3 of FIG. 4a.
0 is a plan view showing the wire mesh 31 cut away, FIG. 5 is a diagram showing how breath and sound are incident on the windscreen 30 of FIG. 7 and 7 are views showing other embodiments of this invention, respectively. 1... Body, 3, 30... Wind screen, 31, 32... Hemispherical wire mesh, 33... Ring-shaped metal fitting, 34, 34'... Internal screen, 36,
40, 41″...diffusion member, 2, 17... microphone capsule, 38... diaphragm.

Claims (1)

[Scope of utility model registration request] A microphone characterized in that a diffusing member is disposed above a diaphragm in the direction of air incidence.