Acoustic device

Abstract

To obtain an acoustic device which can discharge water entering a space between a diaphragm and a protection part.SOLUTION: An acoustic device 10 includes: a diaphragm 28 which vibrates to generate sound; and a front cover 14 having an inner protection part 14F which is disposed facing the diaphragm 28 to protect the diaphragm 28 and including drain holes 14E formed at an outer periphery part 14F1 of the inner protection part 14F. The structure allows water entering a space between the diaphragm 28 and the inner protection part 14F to be discharged through the drain holes 14E.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an audio device. [Background technology]

[0002] The following Patent Document 1 discloses a small speaker used in mobile phones and the like. In the small speaker described in this document, an adhesive is applied to the outer periphery of the baffle on the front side of the small speaker to seal (stop leaks) the gap between the rising part of the diaphragm edge and the outer periphery of the baffle. This makes it possible to prevent water that has entered between the flat part of the diaphragm edge and the outer periphery of the baffle from leaking to the front side of the small speaker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-142502 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a configuration having a protective part that protects the diaphragm, it is desirable to be able to drain water that has entered between the diaphragm and the protective part, but the configuration described in Patent Document 1 above leaves room for improvement in this regard.

[0005] SUMMARY OF THE PRESENT INVETION The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an acoustic device that is capable of discharging water that has entered between the diaphragm and the protective portion. [Means for solving the problem]

[0006] The first aspect of the acoustic device comprises a diaphragm that generates sound by vibrating, and a cover having a protective part that is positioned opposite the diaphragm to protect the diaphragm, with drainage holes formed on the outer periphery of the protective part.

[0007] According to the first aspect of the acoustic device, the diaphragm and the protective part of the cover are arranged to face each other. This allows the diaphragm to be protected by the protective part of the cover. Here, drainage holes are formed in the outer periphery of the protective part of the cover. This allows water that has entered between the diaphragm and the protective part to be discharged through the drainage holes.

[0008] The second aspect of the acoustic device is the acoustic device of the first aspect, wherein a concave portion is formed on the diaphragm side of the protective part, which is recessed toward the opposite side to the diaphragm, and the drainage hole is formed at the bottom of the concave portion of the protective part.

[0009] According to the second aspect of the acoustic device, a concave portion is formed on the diaphragm side of the protective portion, the concave portion being recessed toward the opposite side to the diaphragm. Also, the drainage hole is formed in the bottom of the concave portion of the protective portion. With this configuration, water that accumulates in the bottom of the concave portion of the protective portion can be discharged through the drainage hole.

[0010] The acoustic device of the third aspect is the acoustic device of the first aspect, wherein a convex portion protruding toward the diaphragm side is formed on the diaphragm side of the protective portion, and the water drainage holes are formed around the convex portion of the protective portion.

[0011] According to the third aspect of the acoustic device, a convex portion protruding toward the diaphragm side is formed on the diaphragm side of the protective portion. Also, the water drainage holes are formed around the convex portion of the protective portion. With this configuration, water that has flowed from the convex portion to around the convex portion can be discharged through the water drainage holes.

[0012] The acoustic device of the fourth aspect is the acoustic device of the second or third aspect, in which a first inclined surface and a second inclined surface that are inclined with respect to the vibration direction of the diaphragm are formed on the diaphragm side of the protective part, and the water drainage hole is formed at the connection portion between the first inclined surface and the second inclined surface.

[0013] According to the fourth aspect of the acoustic device, the protective part is provided on the diaphragm side with a first inclined surface and a second inclined surface inclined with respect to the vibration direction of the diaphragm. The water drainage hole is provided at the connection portion between the first inclined surface and the second inclined surface. In this configuration, water accumulated at the connection portion between the first inclined surface and the second inclined surface can be discharged through the water drainage hole.

[0014] An acoustic device of a fifth aspect is an acoustic device of any one of the first to fourth aspects, in which a through hole is formed in an area inward from the area in which the drainage hole is formed in the protective part.

[0015] According to the fifth aspect of the acoustic device, a through hole is formed in an area inside the area where the water drainage hole is formed in the protective part. In this configuration, the sound generated by the diaphragm passes through the through hole. This makes it possible to suppress attenuation of the sound generated by the diaphragm by the protective part.

[0016] The acoustic device of the sixth aspect is an acoustic device of any one of the first to fifth aspects, further comprising an outer cover having an outer protective part attached to the cover and arranged opposite the diaphragm, wherein an outer cover side through hole is formed in the outer protective part, and when viewed from the outer protective part side, the outer cover side through hole and the water drainage hole are arranged at different positions from each other.

[0017] According to the sixth aspect of the acoustic device, the outer cover is attached to the cover. As a result, the diaphragm is protected by the protective part of the cover, and the diaphragm is protected by the outer protective part of the outer cover. Here, the outer protective part is formed with an outer cover side through hole. In this configuration, the sound generated by the diaphragm passes through the outer cover side through hole. This makes it possible to suppress the sound generated by the diaphragm from being attenuated by the outer protective part. Also, as viewed from the outer protective part side, the outer cover side through hole and the water drain hole are arranged at different positions from each other. In this configuration, it is possible to suppress the water that has entered through the outer cover side through hole from entering the diaphragm side through the water drain hole.

[0018] The seventh aspect of the acoustic device is the acoustic device of the sixth aspect, wherein an outer cover side concave portion is formed on the diaphragm side of the outer protective part, which is recessed toward the opposite side to the diaphragm, and an outer cover side drainage hole is formed at the bottom of the outer cover side concave portion of the outer protective part.

[0019] According to the seventh aspect of the acoustic device, an outer cover side recess is formed on the diaphragm side of the outer protection part, recessed toward the opposite side to the diaphragm. Also, an outer cover side drainage hole is formed at the bottom of the outer cover side recess in the outer protection part. With this configuration, water that accumulates at the bottom of the outer cover side recess in the outer protection part can be drained through the outer cover side drainage hole.

[0020] The acoustic device of the eighth aspect is the acoustic device of the sixth aspect, wherein an outer cover side convex portion that protrudes toward the diaphragm side is formed on the diaphragm side of the outer protective part, and an outer cover side drainage hole is formed around the outer cover side convex portion of the outer protective part.

[0021] According to the eighth aspect of the acoustic device, an outer cover side convex portion that protrudes toward the diaphragm side is formed on the diaphragm side of the outer protection part. Also, an outer cover side drainage hole is formed around the outer cover side convex portion of the outer protection part. With this configuration, water that has flowed from the outer cover side convex portion around the outer cover side convex portion can be discharged through the outer cover side drainage hole.

[0022] An acoustic device of a ninth aspect is the acoustic device of any one of the first to eighth aspects, wherein the surface of the protection portion facing the diaphragm is textured.

[0023] In the acoustic device of the ninth aspect, the surface of the protective part facing the diaphragm is textured, which improves the water repellency of the surface of the protective part facing the diaphragm, making it easier to wash away water droplets. Effect of the Invention

[0024] The acoustic device according to the present invention has the excellent effect of being able to drain water that has entered between the diaphragm and the protective portion. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a cross-sectional perspective view of the audio device taken along the front-rear direction. [Diagram 2] 2 is a side cross-sectional view of the acoustic device taken along the front-rear direction. FIG. [Diagram 3] 11 is a front view showing the acoustic device cut along the radial direction between the protective portion of the front cover and the second protective portion of the second front cover. FIG. [Figure 4] 2 is a cross-sectional view showing a cross section of the acoustic device taken along the front-rear direction. FIG. [Diagram 5] FIG. 2 is a front view showing the acoustic device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] An acoustic device 10 according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. The acoustic device 10 of this embodiment is mounted on a vehicle, for example, and can be used as an external sound system (ESS) such as a horn or an acoustic vehicle alerting system (AVAS). The front and rear sides of the acoustic device 10 are indicated by arrows FR and RR, respectively. In the following description, when the front and rear directions are simply indicated, they refer to the front and rear directions of the acoustic device 10 unless otherwise specified. The acoustic device 10 of this embodiment is mounted on the vehicle with its front side (the side indicated by the arrow FR) facing downward of the vehicle.

[0027] 1 and 2, an acoustic device 10 includes a main baffle 12 formed in a box shape, and a front cover 14 that serves as a cover attached to the front portion of the main baffle 12. The acoustic device 10 also includes an acoustic device body 16 that is supported by the main baffle 12 while being disposed within the main baffle 12. In addition, in Figs. 1 and 2, hatching of cross sections has been omitted in consideration of ease of viewing the drawings.

[0028] The main baffle 12 is formed in a cylindrical shape with a bottom that is open on the front side. Specifically, the main baffle 12 has a rear wall portion 12A formed in a disk shape with the thickness direction being in the front-rear direction. The main baffle 12 also has a cylindrical portion 12B extending forward from the radially outer end of the rear wall portion 12A and formed in a cylindrical shape with the axial direction being in the front-rear direction.

[0029] The front cover 14 is formed in a cylindrical shape with a bottom that is open on the rear side. Specifically, the front cover 14 includes a front wall portion 14A that is disposed on the front side of a diaphragm 28 described later. The front cover 14 also includes a cylindrical portion 14B that extends from the outer circumferential end of the front wall portion 14A toward the rear side and is formed in a cylindrical shape with the front-rear direction as the axial direction. The rear end of the cylindrical portion 14B and the front end of the cylindrical portion 12B of the main baffle 12 are joined. As a result, a space in which the acoustic device main body 16 is disposed is formed between the main baffle 12 and the front cover 14. The joint between the rear end of the cylindrical portion 14B and the front end of the cylindrical portion 12B of the main baffle 12 is sealed with a sealant (for example, an adhesive). As a result, the watertightness of the joint between the rear end of the cylindrical portion 14B and the front end of the cylindrical portion 12B of the main baffle 12 is ensured.

[0030] The center of the front wall 14A is a convex portion 14C that protrudes toward the diaphragm 28, which will be described later. The rear surface of the convex portion 14C is disposed along the front surface of the diaphragm 28. A plurality of through holes 14D, each having a long hole shape, are formed in the front wall 14A at a location corresponding to the convex portion 14C. A plurality of drain holes 14E are formed around the convex portion 14C in the front wall 14A.

[0031] A second front cover 18, which serves as a cover and an outer cover, is attached from the front side to the center of the front wall 14A of the front cover 14. The second front cover 18 covers, from the front side, a portion of the front wall 14A that covers a diaphragm 28 and an edge member 30, which will be described later. In other words, the diaphragm 28 and the edge member 30, which will be described later, are protected from the front side by the front wall 14A of the front cover 14 and the second front cover 18. The second front cover 18 is also formed with a plurality of second through holes 18A and a plurality of second drainage holes 18B (examples of drainage holes and outer cover side drainage holes).

[0032] As shown in FIG. 2, the acoustic device main body 16 includes a frame 20, a magnetic circuit section 22 supported by the frame 20, a voice coil 24 disposed within the frame 20, a damper 26 provided between the voice coil 24 and the frame 20, a diaphragm 28 fixed to the voice coil 24, and an edge member 30 connecting the diaphragm 28 to the frame 20.

[0033] The frame 20 is formed in a generally stepped cylindrical shape with a larger opening at the front side than at the rear side. The opening at the front side of the frame 20 is closed by a diaphragm 28 and an edge member 30, which will be described later.

[0034] The magnetic circuit section 22 applies a magnetic field to the voice coil 24 described later. The magnetic circuit section 22 includes a yoke 32 formed in a bottomed cylindrical shape, a disk-shaped magnet 34 fixed to the bottom surface of the yoke 32, and a disk-shaped top plate 36 laminated on the magnet. The yoke 32 and the top plate 36 are formed using a soft magnetic material. The yoke 32 opens toward the front side and is provided so as to close the opening on the rear side of the frame 20. A gap is formed between the magnet 34 and the top plate 36 and the yoke 32, and a part of the voice coil 24 described later is arranged in this gap.

[0035] The voice coil 24 includes a cylindrical bobbin and a coil formed around the bobbin. A diaphragm 28, which will be described later, is fixed to the front end of the bobbin. The coil is formed by winding a linear conductor made of a conductive material around the bobbin. A pair of end portions of the conductor forming the coil are connected to a pair of terminals, not shown, respectively.

[0036] The damper 26 is formed in a disk shape with an opening formed in the radial center and in a wave shape that is repeatedly curved in the front-rear direction along the radial direction. The voice coil 24 is inserted into the opening formed in the center of the damper 26. The inner peripheral portion of the damper 26 is joined to the bobbin of the voice coil 24, and the outer peripheral portion of the damper 26 is joined to the frame 20. Thus, the voice coil 24 and the frame 20 are connected via the damper 26.

[0037] The vibration plate 28 is formed in a circular shape when viewed from the front-rear direction, and is formed in a shape with a concave opening at the front side. The vibration plate 28 includes an outer peripheral portion 28A formed in a ring shape constituting the radial outer portion of the vibration plate 28, and an inner peripheral portion 28B constituting the radial center portion of the vibration plate 28 and formed integrally with the outer peripheral portion 28A. The outer peripheral portion 28A is formed in a funnel shape narrowing from the front side to the rear side. The inner peripheral portion 28B is formed in a shape that is convex toward the rear side and is recessed in a concave shape at the front side. Note that the arrow R indicates the radial outside of the vibration plate 28, and the arrow C indicates the circumferential direction of the vibration plate 28. The radial direction of the vibration plate 28 (the direction of the arrow R and the direction opposite to the arrow R) and the circumferential direction of the vibration plate 28 (the direction of the arrow C and the direction opposite to the arrow C) are perpendicular to the front-rear direction. Hereinafter, when the radially outer and inner directions are simply indicated, they refer to the radially outer and inner directions of the diaphragm 28, unless otherwise specified. Also, when the circumferential direction is simply indicated, they refer to the circumferential direction of the diaphragm 28, unless otherwise specified.

[0038] The edge member 30 is made of an elastic material such as rubber, and is formed in a ring shape when viewed from the front-rear direction. A radially outer end of the edge member 30 is joined to the front end of the frame 20. A radially inner end of the edge member 30 is joined to a radially outer end of the outer periphery 28A of the diaphragm 28 in a state where the radially outer end of the outer periphery 28A is overlapped with the radially outer end of the outer periphery 28A in the front-rear direction.

[0039] Next, the configuration of the main parts of this embodiment will be described.

[0040] As described above, the diaphragm 28 and the edge member 30 are protected from the front side by the front wall portion 14A of the front cover 14 and the second front cover 18. Here, as shown in Figs. 3 and 4, the portion of the front wall portion 14A of the front cover 14 facing the diaphragm 28 and the edge member 30 in the front-rear direction is referred to as the inner protective portion 14F (an example of a protective portion). The portion of the front wall portion 14A forming the inner protective portion 14F is offset rearward from the portion 14G of the front wall portion 14A that is radially outer than the inner protective portion 14F. As a result, a step portion 14H is formed at the boundary between the portion of the front wall portion 14A forming the inner protective portion 14F and the portion 14G of the front wall portion 14A that is radially outer than the inner protective portion 14F.

[0041] The part of the inner protective part 14F that is arranged opposite the vibration plate 28 in the front-rear direction is a convex part 14C that protrudes toward the vibration plate 28. In addition, the convex part 14C is formed with a plurality of through holes 14D (six in this embodiment). In other words, the plurality of through holes 14D are formed in an inner region of the region of the inner protective part 14F where a plurality of drainage holes 14E, which will be described later, are formed. The plurality of through holes 14D are formed in a long hole shape with the radial direction as the longitudinal direction, and are arranged at equal intervals along the circumferential direction. In addition, the inner protective part 14F is provided with a central protruding part 14J that protrudes forward from the center in the radial direction of the convex part 14C. This central protruding part 14J is formed in a cylindrical shape with the axial direction being the front-rear direction. In addition, the inner protective part 14F is provided with a plurality of long hole cylindrical parts 14K that protrude forward from the edge parts of the plurality of through holes 14D. The plurality of cylindrical elongated hole portions 14K are respectively connected to the plurality of through holes 14D. The radially inner ends of the plurality of cylindrical elongated hole portions 14K are connected to the central protruding portion 14J. The inner protective portion 14F is provided with a plurality of connecting ribs 14L that protrude forward from the convex portion 14C and connect adjacent cylindrical elongated hole portions 14K in the circumferential direction.

[0042] A plurality of drain holes 14E (24 in this embodiment) are formed in the outer peripheral portion 14F1, which is the radially outer portion of the inner protective portion 14F. In other words, the plurality of drain holes 14E are formed around the convex portion 14C in the inner protective portion 14F. The plurality of drain holes 14E are formed in a circular shape when viewed from the front side, and are arranged at equal intervals along the circumferential direction. The opening area of ​​one drain hole 14E when viewed from the front side is about 1 / 6 to 1 / 10 of the opening area of ​​one through hole 14D when viewed from the front side. Here, as shown in FIG. 4, a concave portion 14M recessed toward the opposite side (front side) from the diaphragm 28 is formed on the diaphragm 28 side (edge ​​member 30 side) of the outer peripheral portion 14F1 of the inner protective portion 14F. The drain hole 14E is formed so as to be connected to the bottom of the concave portion 14M. The radially outer portion of the bottom surface of the recessed portion 14M forms a first inclined surface 14M1 that is gently inclined forward as it approaches radially inward. The radially inner portion of the bottom surface of the recessed portion 14M forms a second inclined surface 14M2 that is gently inclined forward as it approaches radially outward. The water drainage hole 14E is formed to connect to the connection portion between the first inclined surface 14M1 and the second inclined surface 14M2.

[0043] 4 and 5, the second front cover 18 is formed in a disk shape and is attached to the front cover 14 in a state where it is fitted into the step portion 14H of the front cover 14. Here, the portion of the second front cover 18 facing the diaphragm 28 and the edge member 30 in the front-rear direction is referred to as an outer protective portion 18C (an example of a protective portion). A central protrusion 18D that protrudes toward the rear side is provided at the radial center of the outer protective portion 18C. This central protrusion 18D is adapted to engage with the central protrusion 14J of the front cover 14.

[0044] In the portion of the outer protection part 18C that faces the vibration plate 28 in the front-rear direction, a plurality of second through holes 18A (21 in this embodiment) are formed as outer cover side through holes. In other words, the plurality of second through holes 18A are formed in an inner region of the region of the outer protection part 18C where a plurality of second drainage holes 18B, which will be described later, are formed. The plurality of second through holes 18A are formed in an elongated hole shape with the radial direction as the longitudinal direction, and are arranged at intervals along the circumferential direction. Here, in this embodiment, seven second through holes 18A1 among the plurality of second through holes 18A are set to have substantially the same shape and dimensions as the aforementioned through hole 14D. Moreover, the remaining fourteen second through holes 18A2 are set to have a smaller radial dimension than the seven second through holes 18A1. The seven second through holes 18A1 are arranged at equal intervals along the circumferential direction. Furthermore, a pair of second through holes 18A2 are disposed on both sides in the circumferential direction of each of the seven second through holes 18A1.

[0045] A plurality of (24 in this embodiment) second drainage holes 18B are formed in the outer peripheral portion 18C1, which is the radially outer portion of the outer protective portion 18C. The second drainage holes 18B are formed in elongated holes with the radial direction as viewed from the front side, and are arranged at equal intervals along the circumferential direction. The opening area of ​​one drainage hole 14E as viewed from the front side is about half the opening area of ​​one second through hole 18A2 as viewed from the front side.

[0046] Here, as shown in Fig. 5 (also see Fig. 3), when the second front cover 18 is attached to the front cover 14, the multiple second through holes 18A formed in the second front cover 18 and the multiple water drainage holes 14E formed in the front cover 14 are arranged at different positions when viewed from the front side (viewed from the outer protective portion 18C side). Also, the multiple second through holes 18A formed in the second front cover 18 and the multiple through holes 14D formed in the front cover 14 are arranged at different positions. Furthermore, the multiple second water drainage holes 18B formed in the second front cover 18 and the multiple water drainage holes 14E formed in the front cover 14 are arranged at different positions.

[0047] Here, as shown in FIG. 4, a concave portion recessed toward the opposite side (front side) of the diaphragm 28 and a second concave portion 18E as an outer cover side concave portion are formed on the diaphragm 28 side (edge ​​member 30 side) of the outer protective part 18C. The second drainage hole 18B is formed so as to connect to the bottom of the second concave portion 18E. Also, a convex portion gently protruding toward the diaphragm 28 side (rear side) and a second convex portion 18F as an outer cover side convex portion are formed on the diaphragm 28 side of the inner periphery 18C2 of the outer protective part 18C. The second drainage hole 18B is formed around the second convex portion 18F.

[0048] (Actions and Effects of the Present Embodiment) Next, the operation and effects of this embodiment will be described.

[0049] 1 and 2, in the acoustic device 10 of this embodiment, electricity is supplied to the coil of the voice coil 24 via wiring paths (not shown) and external connectors (not shown), etc. As a result, as the voice coil 24 moves in the front-rear direction, the diaphragm 28 vibrates to generate sound.

[0050] 4 and 5, a plurality of water drainage holes 14E are formed in the outer periphery 14F1 of the inner protective portion 14F of the front cover 14. This allows water that has entered between the diaphragm 28 and the inner protective portion 14F to be discharged through the water drainage holes 14E.

[0051] In this embodiment, a recessed portion 14M recessed toward the opposite side of the diaphragm 28 is formed on the diaphragm 28 side of the outer peripheral portion 14F1 of the inner protective portion 14F. The drainage hole 14E is formed to connect to the bottom of the recessed portion 14M in the inner protective portion 14F. In this configuration, water accumulated at the bottom of the recessed portion 14M in the inner protective portion 14F can be discharged through the drainage hole 14E. A first inclined surface 14M1 and a second inclined surface 14M2 are formed on the bottom surface of the recessed portion 14M. The drainage hole 14E is formed to connect to the connection portion between the first inclined surface 14M1 and the second inclined surface 14M2. In this configuration, water accumulated at the connection portion between the first inclined surface 14M1 and the second inclined surface 14M2 can be discharged through the drainage hole 14E.

[0052] In this embodiment, the inner protective portion 14F is formed with a convex portion 14C that protrudes toward the diaphragm 28. The water drainage holes 14E are formed around the convex portion 14C in the inner protective portion 14F. In this configuration, water that has flowed from the convex portion 14C to around the convex portion 14C can be discharged through the water drainage holes 14E.

[0053] In addition, in this embodiment, a plurality of through holes 14D are formed in an area inside the area where the plurality of drainage holes 14E are formed in the inner protective portion 14F. In this configuration, the sound generated by the diaphragm 28 passes through the plurality of through holes 14D. This makes it possible to suppress the sound generated by the diaphragm 28 from being attenuated by the inner protective portion 14F. In addition, acoustic resonance is created between the space formed by the protective portion 14F and the diaphragm 28 and the through holes 14D, making it possible to amplify sounds of a specific frequency.

[0054] Further, in this embodiment, the second front cover 18 is attached to the front cover 14. As a result, the diaphragm 28 is protected by the inner protective portion 14F of the front cover 14, and the diaphragm 28 is protected by the outer protective portion 18C of the second front cover 18. Here, the outer protective portion 18C is formed with a plurality of second through holes 18A. In this configuration, the sound generated by the diaphragm 28 passes through the second through holes 18A. This makes it possible to suppress the sound generated by the diaphragm 28 from being attenuated by the outer protective portion 18C. Also, as viewed from the outer protective portion 18C side, the plurality of second through holes 18A and the plurality of water drainage holes 14E formed in the front cover 14 are arranged at different positions from each other. In this configuration, it is possible to suppress the intrusion of foreign matter (e.g., pebbles) that has entered through the second through holes 18A into the diaphragm 28 side through the water drainage holes 14E.

[0055] In this embodiment, a second concave portion 18E recessed toward the opposite side of the diaphragm 28 is formed on the diaphragm 28 side of the outer peripheral portion 18C1 of the outer protective portion 18C. A second drainage hole 18B is formed at the bottom of the second concave portion 18E on the outer peripheral portion 18C1 of the outer protective portion 18C. In this configuration, water accumulated at the bottom of the second concave portion 18E of the outer protective portion 18C can be discharged through the second drainage hole 18B. In addition, a second convex portion 18F gently protruding toward the diaphragm 28 side is formed on the diaphragm 28 side of the inner peripheral portion 18C2 of the outer protective portion 18C. In addition, a second drainage hole 18B is formed around the second convex portion 18F of the outer protective portion 18C. In this configuration, water flowing from the second convex portion 18F to around the second convex portion 18F can be discharged through the second drainage hole 18B.

[0056] At least one of the inner protection portion 14F and the outer protection portion 18C may be textured on the surface facing the diaphragm 28. The textured surface has improved water repellency, allowing water droplets to flow off more easily.

[0057] In the present embodiment, an example in which the second front cover 18 is provided has been described, but the present invention is not limited to this. Whether or not to provide the second front cover 18 may be appropriately determined in consideration of the environment in which the audio device 10 is installed, etc.

[0058] In the present embodiment, an example has been described in which water flowing from the convex portion 14C side to the concave portion 14M side can be discharged through the water drainage hole 14E, and water flowing from the second convex portion 18F side to the second concave portion 18E side can be discharged through the second water drainage hole 18B, but the present invention is not limited to this. The configuration for directing water to the water drainage hole 14E and the second water drainage hole 18B side may be appropriately set in consideration of the posture in which the acoustic device 10 is mounted, etc. Also, a configuration in which a part of the radially outer portion of the convex portion 14C is recessed toward the front side may be used.

[0059] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement the present invention in various other modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0060] 10 Sound equipment 14 Front cover (cover) 14C Convex part 14D through hole 14E Drain hole 14F Inner protection part (protection part) 14F1 Outer periphery of protective part 14M concave part 14M1 1st slope 14M2 2nd slope 18 Second front cover (outer cover, cover) 18A Second through hole (Outer cover side through hole) 18B Second drain hole (drain hole, outer cover side drain hole) 18C Outer protection part (protection part) 18E Second concave portion (concave portion, outer cover side concave portion) 18F Second convex part (convex part, outer cover side convex part) 28 Diaphragm

Claims

1. A diaphragm that generates sound by vibrating; A cover having a protective portion for protecting the diaphragm by being disposed opposite the diaphragm, the protective portion having a drain hole formed on an outer periphery thereof; An audio device equipped with

2. A concave portion is formed on the diaphragm side of the protective portion, the concave portion being recessed toward a side opposite to the diaphragm, The acoustic device according to claim 1 , wherein the drainage hole is formed in a bottom of the recessed portion of the protective portion.

3. A convex portion protruding toward the diaphragm side is formed on the diaphragm side of the protection portion, The acoustic device according to claim 1 , wherein the drainage holes are formed around the convex portion of the protective portion.

4. A first inclined surface and a second inclined surface inclined with respect to a vibration direction of the diaphragm are formed on the diaphragm side of the protective portion, The acoustic device according to claim 2 or 3, wherein the drainage hole is formed at a connection portion between the first inclined surface and the second inclined surface.

5. The acoustic device according to claim 1 , wherein a through hole is formed in an area of ​​the protective portion on the inside of an area in which the drainage hole is formed.

6. an outer cover having an outer protective portion attached to the cover and disposed opposite the diaphragm; The outer protection portion has an outer cover side through hole formed therein, The acoustic device according to claim 1 , wherein the outer cover through-hole and the water drainage hole are disposed at different positions when viewed from the outer protective portion side.

7. An outer cover side concave portion is formed on the diaphragm side of the outer protection portion, the outer cover side concave portion being recessed toward the opposite side to the diaphragm, The acoustic device according to claim 6 , wherein an outer cover side drain hole is formed in a bottom of the outer cover side recess of the outer protective part.

8. An outer cover side convex portion protruding toward the diaphragm side is formed on the diaphragm side of the outer protection portion, The acoustic device according to claim 6, wherein an outer cover side drain hole is formed around the outer cover side convex portion of the outer protection portion.

9. The acoustic device according to claim 1 , wherein a surface of the protection portion facing the diaphragm is textured.

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