JP2019149698A - Microphone - Google Patents

Abstract

To provide a microphone with excellent environmental resistance, in which a waterproof film is not damaged even against a high pressure water flow as in car wash.SOLUTION: A microphone includes: an electroacoustic conversion module 2 in which various electronic components including an electroacoustic conversion element 2a are mounted on a circuit board 2c; a housing 1 having a space at the inside thereof while having, on one face, a sound hole 1h1 communicating with the inside, the housing receiving the electroacoustic conversion module 2 such that the electroacoustic conversion element 2a is located on the sound hole 1h1; a waterproof film 6 for preventing water and dust from entering the inside of the housing through the housing sound hole 1h1; a flat plate-shaped cover member 7 spaced apart from a housing face provided with the housing sound hole 1h1, the cover member including four cover sound holes 7h1-7h4 arranged at positions where the waterproof film 6 cannot be seen when the housing face provided with the housing sound hole 1h1 is viewed from a direction orthogonal to the housing face; and four post members 8 for fixing the cover member 7 to the housing 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a microphone that is arranged outside a vehicle cabin and is used to collect a voice of a person or a running sound of another vehicle, and more particularly to a microphone having a structure that prevents intrusion of water, dust, and the like.

  As an application of a microphone installed outside a vehicle compartment, for example, there is a device described in Patent Document 1. The apparatus includes a plurality of microphones arranged and used outside a passenger compartment, detects a traveling sound of another vehicle using these microphones, and estimates a sound source direction of the vehicle based on the detected traveling sound. is there. Further, Patent Document 2 discloses that a contact microphone that collects a body conduction sound of a person's utterance voice in contact with the human body is arranged on the outer periphery of the vehicle to collect the person's utterance voice and collect the uttered voice. The apparatus which recognizes operation content by processing and controls an in-vehicle device according to the recognized operation content is described.

  In addition, although it is not a vehicle-mounted use, as a structure of the microphone mounted in electronic devices, such as a mobile phone and a smart phone, the point which uses a waterproof film is described in patent document 3, for example.

International Publication No. 2011-136234 JP 2006-276605 A JP 2006-186422 A

  As described above, devices that require a microphone installed outside the vehicle compartment are being developed. However, since the microphone itself is used outdoors, durability against intrusion of rainwater, dust, and the like is required. However, although the conventional microphone is environmentally resistant, the waterproof membrane may be damaged when a high-pressure water flow (hereinafter referred to as “high-pressure water flow”) is applied during car washing or the like. Yes, environmental resistance was not enough.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a microphone excellent in environmental resistance in which a waterproof film is not damaged even by a high-pressure water flow during car washing. To do.

  The microphone of the present invention has an acoustic conversion module in which various electronic components including an electroacoustic conversion element are mounted on a circuit board, a sound hole having a space inside and leading to the inside on one side, and the sound hole includes the sound hole. A housing that houses the acoustic conversion module so that the electroacoustic transducer is located, a waterproof film that prevents water and dust from entering the sound chamber through the sound holes of the housing, and a sound of the housing At least one disposed at a position where the waterproof film cannot be seen when the surface of the housing provided with the sound hole is viewed from a direction orthogonal to the surface. A flat cover member having a sound hole; and at least one support member for fixing the cover member to the housing.

  According to the said structure, the water which comes from the direction orthogonal to the surface in which the waterproof film which covers the sound hole of a housing | casing was provided can be poured out from the clearance gap between a cover member and a housing | casing. Therefore, even when a high-pressure water flow is applied as in car washing, it is possible to obtain high environmental resistance that prevents the waterproof membrane from being damaged.

  In the above configuration, the casing has a concave shape in cross section in which a peripheral portion of the sound hole including a portion where the sound hole is formed is recessed with respect to the surface of the casing, and the waterproof film is formed in the recess of the casing. Be placed.

  According to the said structure, even if water flows into the clearance gap between a cover member and a housing | casing, the water flow does not hit a waterproof membrane directly. Therefore, even when a high-pressure water flow is applied as in car washing, it is possible to obtain high environmental resistance that prevents the waterproof membrane from being damaged.

  The said structure WHEREIN: It has the some wall member spaced apart along the peripheral part of the surface in which the sound hole of the said housing | casing was provided between the said cover member and the said housing | casing.

  According to the above configuration, even when water flows toward the side of the housing, the water flow does not directly hit the waterproof membrane. Therefore, even when a high-pressure water flow is applied as in car washing, it is possible to obtain high environmental resistance that prevents the waterproof membrane from being damaged.

  According to the present invention, it is possible to obtain high environmental resistance that prevents the waterproof membrane from being damaged even by a high-pressure water flow such as during car washing.

The front view and bottom view which show the external appearance of the microphone which concerns on 1st Embodiment of this invention. 1A is a cross-sectional view of the microphone according to the first embodiment, taken along line AA in FIG. Sectional drawing which shows the flow of the high voltage | pressure water flow in the microphone which concerns on 1st Embodiment Sectional drawing of the microphone which concerns on 2nd Embodiment of this invention. Sectional drawing which shows the flow of the high-pressure water flow in the microphone which concerns on 2nd Embodiment. The front view and bottom view which show the external appearance of the microphone which concerns on 3rd Embodiment of this invention. BB line sectional view of Drawing 6 (a) of a microphone concerning a 3rd embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(First embodiment)
1A and 1B are a front view and a bottom view showing the appearance of the microphone 100 according to the first embodiment of the present invention. In this case, (a) of FIG. 1 is a front view, and (b) is a bottom view. FIG. 2 is a cross-sectional view of the microphone 100 around the line AA in FIG. As shown in FIGS. 1 and 2, the microphone 100 according to the first embodiment has a space inside, and a sound hole (hereinafter referred to as “housing sound hole”) 1h1 is opened at the center of the lower part. The box-shaped casing 1, the acoustic conversion module 2 accommodated in the casing 1, and an audio signal output from the acoustic conversion module 2 are transmitted to an external device (not shown), and power from the external device is transmitted. A wiring 3 for supplying to the acoustic conversion module 2, a connector 4 connected to a wire harness (not shown) for connection to an external device (not shown), and a housing sound hole 1h1 opened in the housing 1. Sealing packing 5 for preventing sound leakage from the sound hole 2h opened in the acoustic conversion module 2, and intrusion of water and dust from the housing sound hole 1h1 of the housing 1 into the housing 1 Waterproof membrane 6 and housing sound hole 1h of housing 1 And a cover member 7 for protecting the waterproof membrane 6 from a high-pressure water flow during car washing or the like, and a space between the cover member 7 and the housing 1 along the periphery of the housing sound hole 1h1 opened in the housing 1 And four strut members 8 arranged and supporting the cover member 7.

  The casing 1 includes a cubic container portion 1a having an open surface, a rectangular plate-shaped lid portion 1b that closes the opening end of the container portion 1a and has the above-described casing sound hole 1h1 opened in the center portion. Composed. Further, in FIG. 2, a through hole 1h2 for passing the above-described wiring 3 is opened on the right side surface of the container portion 1a. In FIG. 2, an acoustic conversion module 2 includes an electroacoustic conversion element 2a, a surface mounting component 2b such as a resistor, a capacitor, an inductance, an IC (integrated circuit), and a transistor, and a circuit for mounting the surface mounting component 2b. And a substrate 2c. The above-described sound hole 2h is formed in the center of the circuit board 2c, and the electroacoustic transducer 2a is disposed on the sound hole 2h. The acoustic conversion module 2 is arranged so that the central axis of the sound hole 2h of the circuit board 2c matches the central axis of the housing sound hole 1h1 of the housing 1. Specifically, the electroacoustic transducer 2a is appropriately selected from ECM (Electret Condenser Microphone), MEMS (Micro Electro Mechanical System) technology, or a so-called silicon microphone manufactured using microphone mouth machining technology, or a dynamic microphone as appropriate. It is.

  The packing 5 is provided with a through hole 5 h having the same diameter as the housing sound hole 1 h 1 of the housing 1. The packing 5 is arranged so that the axis of the through hole 5h coincides with the axis of the sound hole 2h of the circuit board 2c and the axis of the housing sound hole 1h1 of the lid 1b of the housing 1.

  The waterproof film 6 is fixed to the surface of the lid 1b by an adhesive or heat welding so as to cover the housing sound hole 1h1 of the housing 1. A material such as PTFE (polytetrafluoroethylene) is appropriately selected for the waterproof film 6. The cover member 7 has a flat plate shape substantially the same size as the lid portion 1 b of the housing 1, and is disposed apart from the surface of the lid portion 1 b of the housing 1. The cover member 7 is provided with four sound holes (hereinafter referred to as “cover sound holes”) 7 h 1 to 7 h 4 for taking in external sound outside the portion covering the waterproof film 6. As shown in FIG. 1B, the four cover sound holes 7h1 to 7h4 of the cover member 7 are obtained when the surface of the housing 1 provided with the housing sound hole 1h1 is viewed from a direction perpendicular to the surface. The housing sound hole 1h1 and the waterproof film 6 are not visible (usually, since the waterproof film 6 is affixed on the housing sound hole 1h1 as in the present embodiment, “the waterproof film 6 is not visible”). Is done. That is, even if water or the like enters from the cover sound holes 7h1 to 7h4, the cover sound holes 7h1 to 7h4 are disposed at positions where they do not directly hit the waterproof film 6. The four cover sound holes 7h1 to 7h4 are all formed in an arc shape and are arranged on the same circumference at regular intervals. The shape and number of the four cover sound holes 7h1 to 7h4 may be changed as appropriate.

  The support members 8 have a cylindrical shape, and are arranged one by one at the four corners of the housing 1 and the cover member 7. The strut member 8 and the lid portion 1b of the housing 1 and the strut member 8 and the cover member 7 are fixed by an adhesive, fitting, integral molding, heat welding, laser welding, or screwing, respectively.

  The microphone 100 according to the present embodiment is configured as described above, and introduces sound from the four cover sound holes 7h1 to 7h4 opened in the cover member 7 and the gap between the cover member 7 and the housing 1, and is waterproof. The film 6 is sent from the housing sound hole 1h1 of the housing 1 to the electroacoustic transducer 2a, and is converted into an electrical signal by the electroacoustic transducer 2a. The converted electrical signal is sent to an external device (not shown) through a wire harness (not shown) connected to the connector 4 via the wiring 3.

  Further, in the microphone 100 according to the present embodiment, as shown in the sectional view of FIG. 3A, when a high-pressure water flow such as a car wash hits from the front, as shown in the bottom view of FIG. In addition, since the cover sound holes 7h1 to 7h4 are arranged so that the waterproof film 6 cannot be seen from the cover sound holes 7h1 to 7h4 of the cover member 7, the water flow passing through the cover sound holes 7h1 to 7h4 is applied to the waterproof film 6. There is no direct hit. Thereby, since the high-pressure water flow at the time of car washing is not added to the waterproof membrane 6, it is possible to obtain high environmental resistance without causing the waterproof membrane 6 to be damaged.

  In the microphone 100 of the present embodiment, as shown in the cross-sectional view of FIG. 3B, there is a gap due to the support member 8 between the cover member 7 and the housing 1, so that a high-pressure water flow such as a car wash Flows from the cover sound holes 7 h 1 to 7 h 4, and thereafter is discharged out of the microphone 100 through the gap between the cover member 7 and the housing 1. Thereby, since the high-pressure water flow at the time of car washing is not directly applied to the waterproof membrane 6, it is possible to obtain high environmental resistance without causing the waterproof membrane 6 to be damaged. Further, even when a thin rod-shaped foreign matter (wire, branch, etc.) enters from the cover sound holes 7h1 to 7h4, the waterproof film 6 is hardly damaged by the foreign matter.

  As described above, according to the microphone 100 according to the present embodiment, the waterproof membrane 6 provided on the housing sound hole 1h1 of the housing 1 that houses the acoustic conversion module 2 is covered, and the four sound passages for allowing sound to pass through are provided. Since the cover member 7 having the cover sound holes 7h1 to 7h4 is provided, since the high-pressure water flow during car washing is not directly applied to the waterproof film 6, the waterproof film 6 is not damaged and has high environmental resistance. Can be earned.

(Second Embodiment)
Next, a microphone according to a second embodiment of the present invention will be described.
FIG. 4 is a cross-sectional view showing the structure of the microphone 110 according to the second embodiment of the present invention. As shown in the figure, the microphone 110 according to the present embodiment is partially different from the microphone 100 according to the first embodiment described above in the shape of the housing. That is, in the microphone 110 according to the present embodiment, the peripheral portion of the housing sound hole 10h1 of the housing 10 has a concave shape that is lowered by one step with respect to the surface of the housing sound hole 10h1. By making the peripheral portion of the housing sound hole 10 h 1 concave, the waterproof film 6 disposed in the housing sound hole 10 h 1 is also in a position that is lowered by one step with respect to the surface of the housing 10.

  With this configuration, as shown in the cross-sectional view of FIG. 5A, the waterproof film 6 is disposed at a position where it cannot be seen from the gap between the cover member 7 and the housing 10 even when a high-pressure water flow hits the side surface of the microphone 110. Therefore, the direct water flow through the gap between the cover member 7 and the housing 10 does not hit the waterproof film 6. Thereby, since the high-pressure water flow at the time of car washing is not directly applied to the waterproof membrane 6, it is possible to obtain high environmental resistance without causing the waterproof membrane 6 to be damaged. Further, even when a thin rod-shaped foreign matter (wire, branch, etc.) enters the gap between the cover member 7 and the housing 10, the waterproof film 6 is hardly damaged by the foreign matter.

  Further, as shown in the cross-sectional view of FIG. 5B, liquid particles (water droplets, oil droplets, etc.) 20 that enter from the outside of the microphone 110 and travel along the surface of the housing 10 remain around the waterproof film 6. Therefore, it is difficult for the material of the waterproof film 6 to deteriorate when the waterproof film 6 is immersed in the liquid particles 20.

(Third embodiment)
Next, a microphone according to a third embodiment of the present invention will be described.
FIGS. 6A and 6B are a front view and a bottom view showing the appearance of the microphone 120 according to the third embodiment of the present invention. 6A is a front view, and FIG. 6B is a bottom view. FIG. 7 is a cross-sectional view taken along line BB in FIG. As shown in FIG. 6, the microphone 120 according to the present embodiment is different from the microphone 100 according to the first embodiment in that wall members 11 a and 11 b are arranged in a gap between the cover member 7 and the housing 1. ing. The wall members 11a and 11b are arranged on the peripheral portions of the four sides of the housing 1, respectively. In this case, a short wall member 11 a is disposed on the short side of the housing 1, and a long wall member 11 b is disposed on the long side of the housing 1.

  With this configuration, as shown in the cross-sectional view of FIG. 7, the waterproof film 6 is invisible from the gap between the cover member 7 and the housing 1 by the four wall members 11 a and 11 b and the support member 8. Even if a high-pressure water flow such as from the side hits from the side, the direct water flow through the gap between the cover member 7 and the housing 1 does not hit the waterproof membrane 6. Thereby, since the high-pressure water flow at the time of car washing is not directly applied to the waterproof membrane 6, it is possible to obtain high environmental resistance without causing the waterproof membrane 6 to be damaged. Further, even when a thin rod-shaped foreign matter (wire, branch, etc.) enters the gap between the cover member 7 and the housing 1, the waterproof film 6 is hardly damaged by the foreign matter.

  By using the microphone of the present invention, it is possible to realize a practical vehicle trunk opening / closing system, vehicle door opening / closing system, vehicle light illumination system, or sound source direction estimating device having high environmental resistance.

  INDUSTRIAL APPLICABILITY The present invention is useful as a microphone disposed in a vehicle for the purpose of detecting the voice of a speaker who is outside the vehicle and detecting other vehicles approaching the host vehicle.

1,10 housing 1h1, 10h1 housing sound hole (sound hole)
2 acoustic conversion module 2a electroacoustic conversion element 2b surface mount component 2c circuit board 2h sound hole 3 wiring 4 connector 5 packing 5h through hole 6 waterproof film 7 cover member 7h1-7h4 cover sound hole 8 support member 11a, 11b wall member 100, 110, 120 microphone

Claims (3)

An acoustic conversion module in which various electronic components including an electroacoustic conversion element are mounted on a circuit board;
A housing that has a space inside and has a sound hole that communicates with the inside on one side, and that houses the acoustic conversion module so that the electroacoustic conversion element is positioned in the sound hole;
A waterproofing membrane that prevents water and dust from entering the housing from the sound holes of the housing;
Arranged at a position away from the surface provided with the sound hole of the housing, and at a position where the waterproof membrane cannot be seen when the surface provided with the sound hole of the housing is viewed from a direction orthogonal to the surface. A flat cover member having at least one sound hole;
At least one strut member for fixing the cover member to the housing;
A microphone equipped with.   The casing has a concave cross-sectional shape in which a peripheral portion of a sound hole including a portion in which the sound hole is formed is recessed with respect to the surface of the casing, and the waterproof film is disposed in a recess of the casing. Item 2. The microphone according to item 1.   The microphone according to claim 1, further comprising: a plurality of wall members that are spaced apart from each other along a peripheral portion of a surface of the housing in which a sound hole is provided, between the cover member and the housing. .

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