JP2595333Y2 - Wind noise prevention 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 wind noise prevention microphone, and more particularly to a wind noise prevention microphone effective for reducing wind noise and pop noise.

[0002]

2. Description of the Related Art For example, a communication microphone is often used outdoors. Therefore, when the wind is strong, the clarity of communication may be impaired by the wind noise. Also, the pop noise of the speaker may similarly hinder communication. Therefore, a wind noise prevention type microphone has been conventionally proposed.

FIG. 4 is a longitudinal sectional view of a conventional wind noise prevention type microphone.

The wind noise prevention microphone shown in FIG. 4 has an acoustic resistance members 12, 11, 10 and spacers 3, a spacer 3, and a microphone unit (hereinafter referred to as "MIC") in a housing 1 in order from the direction in which sound enters. Unit.) 2
And are attached. The acoustic resistance material 10, 11,
Among the 12, for example, the acoustic resistance material 10 is formed of non-woven fabric, the acoustic resistance material 11 is formed of urethane foam, and the acoustic resistance material 12 is formed of felt.
By the laminated body of these acoustic resistance materials 10, 11, and 12,
I try to reduce wind noise and pop noise.

[0005]

However, in the above-mentioned prior art, a plurality of sheets of, for example, acoustic resistance materials 10, 1 made of different materials are used.
1 and 12 are merely superposed, and FIG.
→ Since the sound progresses in a straight line as shown by B, there is a problem that the attenuation effect of the wind noise is not necessarily improved. Also,
Since different types of acoustic resistance materials such as nonwoven fabric, urethane foam and felt must be prepared, many steps are required for manufacturing and assembling, and there is a problem that the cost is increased and there is also a problem that the size is increased.

The present invention has been proposed in view of the above points, and aims at effectively reducing wind noise and pop noise, and reducing the number of steps for manufacturing and assembling an acoustic resistance material. An object of the present invention is to provide a wind noise preventing microphone that can be reduced and can be downsized as a whole.

[0007]

According to the present invention, in order to achieve the above object, in the present invention, an MIC unit 2 and a wind noise absorbing laminate 4 are disposed inside a housing 1, and the wind noise absorbing laminate 4 is provided. , An acoustic resistance material 5 and first and second thin plates 6 and 7 laminated on the front and back surfaces thereof, and the first and second thin plates 6 and 7 are formed of a non-breathable and hard material. Along with
Small holes 8 and 9 are provided in the first and second thin plates 6 and 7 at positions as far as possible from the center, respectively.
90 ° around the central axis OO of the first and second thin plates 6 and 7.
The first and second thin plates 6 and 7 are integrally joined to the wind noise absorbing laminated body 4 by displacing the positions as described above.

[0008]

According to the present invention, the wind noise absorbing laminated body 4 is formed by the acoustic resistance member 5 and the first and second thin plates 6 and 7 laminated on the front and back surfaces thereof. Small holes 8, 9 are provided at positions 6 and 7 as far as possible from the center, and the small holes 8 and 9 are positioned at 90 ° or more around the central axis OO of the first and second thin plates 6 and 7. Are staggered.

Therefore, the sound coming from the opposite side of the housing 1 from the MIC unit 2 enters through the small hole 9 provided in the second thin plate 7 of the wind noise absorbing laminated body 4, and the acoustic resistance material 5 is removed. It passes obliquely and enters the MIC unit 2 through a small hole 8 provided in the first thin plate 6. In this way, the sound paths entering the MIC unit 2 are defined as the first and
Since the small holes 8, 9 provided in the second thin plates 6, 7 are displaced from each other, they are bent at an angle of 90 ° or more and the path length is lengthened, so that wind noise and pop noise can be effectively reduced. Can be reduced.

Further, in the present invention, since it is not necessary to use a large number of acoustic resistance materials of different materials in combination, it is possible to reduce the number of steps for manufacturing and assembling the wind noise absorbing and absorbing portion.
The cost can be reduced, and the wind noise absorbing portion can be made thinner, so that the whole can be made compact.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. FIG. 1 is a side view showing a part of the cross section, and FIG. 2 shows an arrangement state of members constituting a wind noise absorbing laminate. FIG. 3 is a perspective view of the assembled wind noise absorbing laminate.

In the embodiment shown in these figures, a wind noise absorbing laminated body 4, a spacer 3, and an MIC unit 2 are mounted inside a housing 1 in the order from which sound enters.

The wind noise absorbing laminated body 4 is formed by laminating an acoustic resistance material 5, a first thin plate 6, and a second thin plate 7. The acoustic resistance material 5 is made of non-woven fabric, urethane foam,
It is formed of a simple substance such as felt or a composite. The first and second thin plates 6 and 7 are each formed of a non-permeable and hard material such as a hard plastic plate. The first
The thin plate 6 is provided with a small hole 8, and the second thin plate 7 is provided with a small hole 9. Both the small holes 8 and 9 are located as far as possible from the center of the first and second thin plates 6 and 7,
That is, it is provided at a position separated by at least twice the diameter of the small hole itself. And the first and second thin plates 6, 7
Are arranged on the front and back surfaces of the wind noise absorbing laminated body 4 with small holes 8 and 9 displaced from the center axis OO of the first and second thin plates 6 and 7 by 90 ° or more. They are integrally joined by a double-sided adhesive tape or the like.

In the wind noise prevention type microphone of the above embodiment, as shown in FIG. 1, the sound coming from the sound introduction portion of the housing 1 is transmitted through a small hole provided in the second thin plate 7 of the wind noise absorbing laminated body 4. 9, the MIC unit 2 obliquely passes through the acoustic resistance material 5 and passes through the small hole 8 provided in the first thin plate 6.
to go into.

The sound path entering the MIC unit 2 is defined by small holes 8 provided in the first and second thin plates 6 and 7 of the wind noise absorbing laminate 4 as shown by arrows A → B in FIG. , 9 are bent at an angle of 90 ° or more and the path length is increased, so that wind noise and pop noise can be effectively reduced.

As a result, in this embodiment, unlike the prior art, it is not necessary to use a large number of acoustic resistance materials of different materials in combination, so that it is possible to reduce the number of manufacturing and assembling steps of the wind noise absorbing part and to reduce the wind noise absorption. It is possible to reduce the thickness of the relieving portion, and it is possible to reduce the overall size.

[0018]

As described above, in the present invention, the MIC unit 2 and the wind noise absorbing laminate 4 are disposed inside the housing 1, and the wind noise absorbing laminate 4 is replaced with the acoustic resistance material 5, The first and second thin plates 6 and 7 are formed on the front and rear surfaces thereof, and the first and second thin plates 6 and 7 are formed of a non-permeable and hard material. Small holes 8 and 9 are provided in the two thin plates 6 and 7 as far as possible from the center, respectively, and the small holes 8 and 9 are formed around the central axis OO of the first and second thin plates 6 and 7. Displace the position by 90 ° or more,
The first and second thin plates 6 and 7 are integrally joined to the wind noise absorbing laminate 4, and the sound path entering the MIC unit 2 is changed by the first and second thin plates 6 and 7 of the wind noise absorbing laminate 4. The small holes 8 and 9 provided in
The bend at an angle of more than ° and the length of the path are long, which has the effect of effectively reducing wind noise and pop noise.There is no need to use a large number of acoustic resistance materials made of different materials. As a result of reducing the number of steps of manufacturing and assembling the sound absorbing and reducing portion, the effect of reducing the cost can be achieved. In addition, since the wind absorbing and reducing portion can be reduced in thickness, there is also an effect that the overall size can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view, partially in section, showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an arrangement state of members constituting the wind noise absorbing laminate of the embodiment shown in FIG.

FIG. 3 is a perspective view of the wind noise absorbing laminate.

FIG. 4 is a side view showing a cross section of a part of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 MIC unit 3 Spacer 4 Wind noise absorption laminated body 5 Acoustic resistance material 6,7 First and second thin plate 8,9 Small hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A microphone unit 2 and a wind noise absorbing laminated body 4 are arranged inside a housing 1, and the wind noise absorbing laminated body 4 is laminated on an acoustic resistance material 5, and on the front and rear surfaces thereof. The first and second thin plates 6 and 7
The second thin plates 6 and 7 are formed of a non-breathable and hard material, and small holes 8 and 9 are provided in the first and second thin plates 6 and 7 as far away from the center as possible. The holes 8 and 9 are arranged at positions shifted by 90 ° or more around the central axis OO of the first and second thin plates 6 and 7, and the first and second thin plates 6 and 7 are formed in the wind noise absorbing laminate 4. A wind noise prevention microphone characterized by integrally joining