JPH11168781A - Waterproof type microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable and easily miniaturizable waterproof type microphone. SOLUTION: This waterproof type microphone for detecting sound is provided with a microphone case body 11 provided with a recessed part, a microphone main body 22 provided on the bottom part of the recessed part via a waterproof sheet 18 and a net-like body 13 provided on the opening part of the recessed part for preventing the damages of the waterproof sheet 18. In this case, the microphone 22 and an O-ring 12 are attached to a case body main body 111. On the other hand, on the inner side of a front cover 112, after the O-ring 16 and the net-like body 13 have been inserted, a recessed part body 113 is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof microphone that is highly reliable and easy to miniaturize.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view of the configuration of a conventional example generally used in the past, in which a normal indoor microphone 1 is provided with waterproofing and wind noise. Waterproofing measures
It is performed as follows.

[0003] An indoor microphone 1 is inserted into a pipe-shaped metal fitting 3 having a waterproof sheet 2 adhered to the front and side surfaces (a large number of holes are also formed on the side surface to prevent sound insulation). Microphone 1
On the signal extraction side, the seal body 4 is sandwiched between the microphone body 1 and the waterproof connector 5 and between the pipe-shaped fitting 3 and the fastening fitting 6.

[0004] The waterproof connector 5 and the cable 7 are covered with a drip-proof tube 8. The wind noise suppression is realized by covering the waterproof microphone 1 with, for example, a 20 cm diameter urethane windshield 9.

[0005]

However, in such an apparatus, (1) the windshield 9 is so large that it cannot be installed in a narrow place (near a plant apparatus, between pipes, etc.).

(2) Since the windshield is made of urethane foam,
Deterioration is caused by environmental conditions such as direct sunlight, and when installed in a high place, birds may be entangled, so periodic replacement is required and maintenance costs are incurred.

(3) Since the front face of the microphone 1 only has the windshield 9 and the waterproof sheet 2 made of urethane foam, if a strong mechanical shock is applied from the front, the waterproof structure may be broken.

Generally, as a method of preventing wind noise of the microphone 1, a method of attaching a windshield 9 is generally employed. In general, the idea of the waterproof structure is to take waterproof measures for the indoor microphone 1, and the microphone 1 is housed in a case 3 having a waterproof structure, which is more suitable as a waterproof microphone. I can't say.

The present invention solves this problem. An object of the present invention is to provide a waterproof microphone that is highly reliable and easy to miniaturize.

[0010]

In order to achieve this object, the present invention provides: (1) a waterproof microphone for detecting sound, comprising: a microphone housing having a concave portion; and a waterproof sheet provided on the bottom of the concave portion. A waterproof type microphone comprising: a microphone main body provided in the opening; and a mesh body provided in an opening of the concave portion to prevent damage to the waterproof sheet. (2) The waterproof microphone according to (1), further comprising a net made of metal. (3) The waterproof microphone according to (1), further comprising a net made of a wire mesh. (4) Two rubber sheet members provided so as to sandwich the waterproof sheet from both sides, a passage hole provided in the rubber sheet member for passing the sound, and the microphone housing via the rubber sheet member. (1) The waterproof microphone according to (1), (2) or (3), further comprising an attached microphone body. (5) The waterproof microphone according to (4), further including a microphone body closely attached to the rubber sheet so as to prevent a sound field from being generated in the microphone housing. (6) A cone-shaped concave portion provided so as to improve the frequency characteristic of the measurement signal is provided. (1)
Or (2) or (3) or (4) or (5). It is what constituted.

[0011]

In the above configuration, the present apparatus is mounted as follows. First, a microphone and an O-ring are attached to the housing body. On the other hand, after the O-ring and the net are inserted into the front or inside the bar, the concave body is inserted.

The recess is fixed to the front or the bar with a washer and a retaining ring. A waterproof sheet sandwiched between two rubber sheets is attached to the bottom of the concave portion of the concave body with a sheet retainer and a screw.

The front cover is screwed and fixed to the housing body so that the microphone is in close contact with the rubber sheet. The space between the front cover and the housing body is sealed with an O-ring. Hereinafter, a detailed description will be given based on embodiments.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention. In the figure, a microphone housing 11 includes a housing main body 111, a front cover 112, and a concave body 113.

The front cover 112 forms a lid of the housing main body 111 and is screwed and fixed to the housing main body 111. The O-ring 12 seals between the front cover 112 and the housing body 111.

On the front cover 112, the mesh 13
The concave body 113 is inserted between the two. The washer 14 and the retaining ring 1
5 and sealed with an O-ring 16

In this case, the net 13 is formed by knitting a metal plate or a metal wire having a large number of holes. The reticulated body 13 is provided to prevent a waterproof sheet described later from being damaged even when an object hits the device.

In this case, the concave portion of the concave body 113
A conical opening is formed so as not to impair the frequency characteristics. FIG. 2 shows the difference in the frequency characteristics between the case where the opening is formed in a conical shape (cone) as shown in the graph A and the case where the opening is formed in a cylindrical shape as shown in the graph B. It can be seen that the frequency characteristics of the cylinder have a greater variation than the frequency characteristics of a cone.

A waterproof sheet 18 sandwiched between two rubber sheets 17 is attached to the bottom of the concave portion of the concave body 113 with a sheet retainer 19 and screws 21. The rubber sheet 17 is provided with a passage hole 171 so that sound can easily pass therethrough.

The microphone body 22 is attached to the housing body 111 so as to oppose the waterproof sheet 18 so that sound passing through the waterproof sheet 18 can be captured. In this case, the microphone body 22 is in close contact with the waterproof sheet 18.

FIG. 3 shows a detailed view of the concave body 113, the rubber sheet 17, the waterproof sheet 18, and the microphone body 22.
The microphone main body 22 is configured to be in close contact with the rubber sheet 17 when the assembly is completed. This is the rubber sheet 17
This is to prevent a sound field from being generated in the space on the housing body 111 side.

The frequency when the microphone body 22 is in close contact with the rubber sheet 17 as shown in the graph C, and when the microphone body 22 is not in close contact with the rubber sheet 17 as shown in the graph D FIG. 4 shows the difference between the characteristics. It can be seen that the frequency characteristics fluctuate more when they are not in close contact.

The microphone body 22 is fixed to the housing body 111, while the concave body 113, the rubber sheet 17 and the waterproof sheet 18 are fixed to the front cover 112,
Is screwed into the housing body 111.

Therefore, when assembly is completed, the waterproof sheet 18
However, if it is configured to directly contact the microphone body 22, the waterproof sheet 18 may be broken due to the torsion force during assembly. In order to avoid this, waterproof sheet 1
8 is sandwiched between rubber sheets 17 so that the microphone body 22 comes into contact with the rubber sheets 17.

FIG. 5 shows the level of the wind noise. As shown in the graph E, although the wind noise is slightly larger than that of the conventional example with the windshield shown in the graph G, it is a level that can be put to practical use, and the wind noise shown in the graph F is taken into consideration. A sufficiently small waterproof microphone can be obtained compared to an indoor microphone that is not used.

In the above configuration, the present apparatus is mounted as follows. First, the microphone main body 22 and the O-ring 12 are attached to the housing main body 111. Meanwhile, bar 1
After the O-ring 16 and the mesh body 13 are inserted into the inside 12, the concave body 113 is inserted.

The concave body 113 is fixed to the front or the bar 112 with the washer 14 and the retaining ring 15. Concave body 113
A waterproof sheet 18 sandwiched between two rubber sheets 17 is attached to the bottom of the concave portion with a sheet retainer 19 and screws 21.

The front cover 112 is screwed and fixed to the housing main body 111 so that the microphone main body 22 comes into close contact with the rubber sheet 17. The O-ring 12 seals between the front cover 112 and the housing body 111.

As described in detail above, the microphone body 22 is provided at the bottom of the concave portion of the microphone housing 11 having the concave portion 113.
Is provided via the waterproof sheet 18, and the mesh body 13 for preventing the waterproof sheet 18 from being damaged is provided at the opening of the recess 113.

As a result, (1) a material having poor weather resistance such as a windshield 9 made of urethane foam or having a low mechanical strength such as a waterproof sheet 18 is not used externally. Since the mesh body 13 for preventing breakage is provided, the waterproof structure is not damaged even when installed outdoors such as a plant, and a highly reliable waterproof microphone can be obtained.

(2) Since the windshield 9 is unnecessary, the size can be reduced.
A waterproof microphone that can be easily installed between pipes and devices is obtained.

(3) If the reticulated body 13 made of metal is used, it is possible to withstand a stronger mechanical shock, and a more reliable waterproof microphone can be obtained.

(4) If the net 13 made of a wire net is used, a commercially available wire net can be used, so that the net 13 can be manufactured at low cost and an inexpensive waterproof microphone can be obtained.

(5) If the waterproof sheet 18 can be attached to both sides by the two rubber sheet members 17, there is no risk of damaging the waterproof sheet 18 during assembly or maintenance. Thus, a waterproof microphone that can be easily maintained can be obtained.

(6) If the microphone body 22 closely attached to the rubber sheet member 17 is used so that a sound field is not generated in the microphone housing body 111, the frequency characteristics of the microphone 22 become flat, and the actual frequency characteristics of the microphone 22 become flat. A waterproof microphone that can record more faithful sound is obtained.

(7) If the conical concave body 113 provided so as to improve the frequency characteristic of the measurement signal is used, the frequency characteristic of the microphone 22 becomes flat, and a sound more faithful to the actual sound is recorded. A waterproof microphone that can be obtained.

[0037]

As described in detail above, the microphone body is provided on the bottom of the concave portion of the microphone housing having the concave portion via the waterproof sheet, and the opening of the concave portion has a mesh shape for preventing the waterproof sheet from being damaged. The body was provided.

As a result, according to the first aspect of the present invention, (1) A material having poor weather resistance such as a windshield made of urethane foam or having low mechanical strength such as a waterproof sheet is used outside. In addition, since the mesh is provided to prevent the waterproof sheet from being damaged, the waterproof structure is not damaged even when the waterproof microphone is installed outdoors such as a plant, so that a highly reliable waterproof microphone can be obtained.

(2) Since a windshield is not required, a waterproof microphone that can be miniaturized and can be easily installed between pipes and devices can be obtained.

According to the second aspect of the present invention, since the mesh made of metal is used, it is possible to withstand a stronger mechanical shock and to obtain a more reliable waterproof microphone.

According to the third aspect of the present invention, since a mesh made of a wire mesh is used, a commercially available wire mesh can be used, so that the mesh can be manufactured at a low cost and an inexpensive waterproof microphone is provided. Is obtained.

According to the fourth aspect of the present invention, if the waterproof sheet is attached to both sides by the two rubber sheet members, there is no danger of damaging the waterproof sheet during assembly or maintenance. Thus, a waterproof microphone that is easy to assemble or maintain can be obtained.

According to the fifth aspect of the present invention, since the microphone body closely attached to the rubber sheet is used so that no sound field is generated in the microphone body, the frequency characteristics of the microphone become flat. The result is a waterproof microphone that can record more faithful sound than actual sound.

According to the sixth aspect of the present invention, the cone-shaped concave body provided is used so as to improve the frequency characteristic of the measurement signal. The result is a waterproof microphone that captures more faithful sound.

Therefore, according to the present invention, the reliability is high,
A waterproof microphone that can be easily miniaturized can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of FIG. 1;

FIG. 3 is a detailed explanatory view of a main part of FIG. 1;

FIG. 4 is an operation explanatory diagram of FIG. 1;

FIG. 5 is an operation explanatory diagram of FIG. 1;

FIG. 6 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Microphone housing 111 Housing main body 112 Front cover 113 Concave body 12 O-ring 13 Mesh body 14 Washer 15 Retaining ring 16 O-ring 17 Rubber sheet 171 Pass-through hole 18 Waterproof sheet 19 Sheet holder 21 Screw 22 Microphone main body

Claims (6)

[Claims] 1. A waterproof microphone for detecting sound, comprising: a microphone housing having a concave portion; a microphone body provided at a bottom of the concave portion via a waterproof sheet; and a waterproof sheet provided at an opening of the concave portion. And a mesh for preventing breakage of the microphone. 2. The waterproof microphone according to claim 1, further comprising a net made of metal. 3. The waterproof microphone according to claim 1, further comprising a net made of a wire net. 4. A microphone housing provided with two waterproof sheets provided on both sides of the waterproof sheet, a through hole provided in the rubber sheet body for passing the sound, and the microphone housing via the rubber sheet body. The waterproof microphone according to claim 1, further comprising a microphone body attached to a body. 5. The waterproof microphone according to claim 4, further comprising a microphone body closely attached to the rubber sheet so as to prevent a sound field from being generated in the microphone housing. 6. A device according to claim 1, further comprising a cone-shaped recess provided so as to improve the frequency characteristic of the measurement signal. The described waterproof microphone.