Vehicle electroacoustic transducer

Abstract

To provide a vehicle electroacoustic transducer which can inhibit deterioration caused by water remaining therein in a structure which attaches the vehicle electroacoustic transducer to an attached member with a fastener.SOLUTION: A vehicle electroacoustic transducer 10 includes: a speaker unit which emits sound; a case 11 which is formed in a box shape and houses the speaker unit; and an attachment part 42 which is formed at the case 11 and may be attached to an attached member outside a passenger compartment by a fastener. The attachment part 42 comprises: a mounting bracket 44 with which the fastener is threadedly engaged; and a bracket housing part 46 which houses the mounting bracket 44. A drain hole 46G for draining is formed at the bracket housing part 46.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an electro-acoustic transducer for a vehicle. [Background technology]

[0002] Patent Documents 1 and 2 disclose a vehicle electroacoustic transducer configured with a speaker unit fixed inside a main body case. In the vehicle electroacoustic transducers described in Patent Documents 1 and 2, the internal space and the external space of the main body case are partitioned by a vibrating body as a boundary, and a ventilation member is provided in a communication hole that communicates between the spaces, allowing the passage of air and blocking the passage of fluid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-29003 [Patent Document 2] Patent Publication No. 2021-29004 Summary of the Invention [Problem to be solved by the invention]

[0004] The vehicle electro-acoustic transducers described in the above Patent Documents 1 and 2 are attached to a mounting member by a fastener such as a bolt. However, in a vehicle electro-acoustic transducer provided outside a vehicle compartment, if water continues to remain at the interface between the fastener such as a bolt and the vehicle electro-acoustic transducer due to the influence of rain or the like, the fastener and part of the vehicle electro-acoustic transducer may deteriorate.

[0005] An object of the present invention is to provide a vehicle electro-acoustic transducer that can suppress deterioration due to residual water in a structure in which the vehicle electro-acoustic transducer is attached to a mounting base by a fastener. [Means for solving the problem]

[0006] A vehicle electro-acoustic transducer according to a first aspect includes a speaker unit that generates sound, a box-shaped case that houses the speaker unit, and a mounting portion that is formed on the case and can be attached to a mounting member outside a vehicle cabin by a fastener, the mounting portion including a mounting metal fitting into which the fastener is screwed, and a metal fitting accommodating portion that accommodates the mounting metal fitting, The metal fitting receiving portion is formed with a drain hole for draining water.

[0007] In the above aspect, the speaker unit is housed in a case, and a mounting portion is formed in the case. The mounting portion is configured to include a mounting bracket into which a fastener is screwed, and a bracket receiving portion that receives the mounting bracket. With the mounting bracket received in the bracket receiving portion, the fastener is screwed into the mounting bracket, thereby making it possible to attach the case together with the speaker unit to a mounting target outside the vehicle cabin.

[0008] In addition, since the metal fitting accommodating portion is formed with a drainage hole for draining water, even if water gets into the metal fitting accommodating portion, the water can be drained through the drainage hole, thereby preventing water from remaining in the metal fitting accommodating portion.

[0009] A vehicle electro-acoustic transducer according to a second aspect is the first aspect, wherein the water drainage holes are formed at a plurality of positions in the metal fitting accommodating portion.

[0010] In the above-described embodiment, the drainage holes are formed in a plurality of locations, which can improve drainage performance compared to a configuration in which the drainage hole is formed in only one location.

[0011] A vehicle electro-acoustic transducer according to a third aspect is the first or second aspect, wherein the water drainage hole is formed in a corner portion constituting the metal fitting receiving portion.

[0012] In the above aspect, water can be prevented from remaining in the corners of the metal fitting receiving portion.

[0013] The vehicle electro-acoustic transducer according to the fourth aspect is any one of the first to third aspects, in which the metal fitting accommodating portion is formed with an insertion hole into which the mounting metal fitting can be inserted, and the water drainage hole is formed on the side of the metal fitting accommodating portion opposite the insertion hole.

[0014] In the above-mentioned aspect, an insertion hole is formed in the metal fitting housing, and the mounting metal can be inserted into this insertion hole. Also, since the water drainage hole is formed on the opposite side to the insertion hole, even if water seeps into the metal fitting housing from the insertion hole, it can be drained from the water drainage hole.

[0015] The vehicle electro-acoustic transducer according to a fifth aspect is any one of the first to fourth aspects, wherein an inclined portion inclined toward the water drainage hole is formed on an inner wall of the metal fitting accommodating portion.

[0016] In the above aspect, water that has entered the metal fitting receiving portion is guided to the water drain hole by the inclined portion, thereby enabling the water inside the metal fitting receiving portion to be efficiently drained. Effect of the Invention

[0017] According to the vehicle electroacoustic transducer of the present invention, in a structure in which the vehicle electroacoustic transducer is attached to a mounting base by a fastener, deterioration due to residual water droplets can be suppressed. [Brief description of the drawings]

[0018] [Figure 1] 1 is an exploded perspective view of a vehicle electroacoustic transducer according to an embodiment of the present invention; [Diagram 2] 1 is a cross-sectional view of a vehicle electro-acoustic transducer according to an embodiment of the present invention, as viewed from the left side. [Diagram 3] 1 is a perspective view of a vehicle electroacoustic transducer according to an embodiment of the present invention, illustrating a state before a mounting bracket is inserted; [Figure 4] 1 is a top view of a vehicle electro-acoustic transducer according to an embodiment of the present invention; [Diagram 5] 5 is a cross-sectional view showing a state cut along line 5-5 in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A vehicle electro-acoustic transducer 10 according to an embodiment will be described with reference to the drawings. Note that arrows FR, UP, and RH shown in each drawing indicate the front, upper, and right directions, respectively, of the vehicle electro-acoustic transducer 10. However, the front-rear direction, up-down direction, and left-right direction of the vehicle electro-acoustic transducer 10 are set for the sake of convenience of explanation, and do not necessarily coincide with the front-rear direction, up-down direction, and left-right direction in a state in which the vehicle electro-acoustic transducer 10 is attached to a mounting member.

[0020] (Overall Configuration of Vehicle Electroacoustic Transducer 10) 1, the vehicle electroacoustic transducer 10 of the present embodiment is mainly composed of a front cover 12, a case body 14, a speaker unit 16, and a rear cover 18. The front cover 12, the case body 14, and the rear cover 18 form a case 11, and the case 11 houses the speaker unit 16.

[0021] Here, as an example, the vehicular electroacoustic transducer 10 of this embodiment is mounted in a power unit compartment provided outside the passenger compartment of the vehicle, and is configured to be mounted on a mounting member 100 (see FIG. 4) disposed in the power unit compartment. Also, as an example, the vehicular electroacoustic transducer 10 of this embodiment is used as an acoustic vehicle alerting system (AVAS) mounted on the vehicle and generating sound when the vehicle is traveling at low speed, thereby notifying pedestrians of the approach of a vehicle.

[0022] First, the speaker unit 16 constituting the vehicle electroacoustic transducer 10 of this embodiment will be described, and then the front cover 12, the case body 14 and the rear cover 18 constituting the case 11 will be described in detail.

[0023] (Speaker unit 16) The speaker unit 16 mainly includes a yoke 20, a frame 22, a magnet 24, a top plate 26, a damper 28, a voice coil 30, and a diaphragm 32.

[0024] 2, the frame 22 is substantially cylindrical with a stepped portion including a small diameter portion 22A and a tapered portion 22B, and is formed of a resin material, for example. The small diameter portion 22A of the frame 22 is disposed on the rear side, and the tapered portion 22B is disposed on the front side, and the direction of the central axis CL of the frame 22 coincides with the front-rear direction. In the following description, the front side of the speaker unit 16 including the frame 22 may be referred to as one side of the direction of the central axis CL, and the rear side of the speaker unit 16 may be referred to as the other side of the direction of the central axis CL.

[0025] The tapered portion 22B has an end portion on the other axial side (the other axial end portion) connected to the small diameter portion 22A, and is formed in a shape in which the diameter gradually increases from the other axial end portion toward the one axial side. A vibration plate 32 is attached to the end portion on one axial side (one axial end portion) of the tapered portion 22B.

[0026] The diaphragm 32 gradually expands in diameter from the other axial end side toward the one axial end side, and the voice coil 30 is attached to the rear surface of the central portion of the diaphragm 32. An annular groove 32A that protrudes toward the other axial end side is formed at the outer circumferential end of the diaphragm 32. The portion of the diaphragm 32 that is on the outer circumferential side of the groove 32A is fixed to one axial end side of the frame 22, and the opening on the one axial end side of the frame 22 is closed by the diaphragm 32.

[0027] Moreover, one axial side portion of the frame 22 is connected to one axial end portion of the case body 14, which will be described later. Therefore, the diaphragm 32 separates the external space and the internal space of the case body 14.

[0028] Meanwhile, the yoke 20, the magnet 24, and the top plate 26 are disposed inside the small diameter portion 22A of the frame 22. The yoke 20 is cylindrical with a bottom and an open front side, and is made of a magnetic material. The front end of the yoke 20 abuts against the frame 22, and the rear end of the yoke 20 abuts against the rear cover 18. Therefore, the yoke 20 is held in a sandwiched state between the frame 22 and the rear cover 18, which will be described later.

[0029] The magnet 24 is generally cylindrical and has a smaller diameter than the yoke 20. In this embodiment, the magnet 24 is formed of a neodymium magnet, for example. The magnet 24 is disposed inside the yoke 20, and the rear surface of the magnet 24 is in contact with the bottom of the yoke 20.

[0030] A top plate 26 is laminated on the front side of the magnet 24. The top plate 26 is made of a magnetic material and has a generally cylindrical shape that is thinner than the magnet 24. The yoke 20, the magnet 24, and the top plate 26 form a magnetic circuit.

[0031] A gap is provided between the top plate 26 and the yoke 20, and the other axial end of the voice coil 30 fits into this gap. The voice coil 30 is formed by winding a conducting wire cylindrically around a bobbin (not shown), and the outer diameter of the voice coil 30 is slightly larger than the magnet 24 and the top plate 26. One axial end of the voice coil 30 is fixed to the center of the diaphragm 32, and the diaphragm 32 is configured to deform in response to the displacement of the voice coil 30.

[0032] A damper 28 is fixed to the outer circumferential surface of the voice coil 30. The damper 28 is generally disk-shaped with an opening in the radial center, and is made of a flexible material. The damper 28 has a generally corrugated cross-sectional shape, and the inner circumferential end of the damper 28 is fixed to the axial center of the voice coil 30, and the outer circumferential end of the damper 28 is fixed to the frame 22. Therefore, the voice coil 30 is supported by the damper 28 inside the frame 22 in a state in which it can move in the axial direction.

[0033] Both ends of the conductor that constitutes the voice coil 30 are connected to terminals (not shown), and power is supplied to the voice coil 30 from a power source external to the vehicle electroacoustic transducer 10 via the terminals.

[0034] The speaker unit 16 is configured as described above, and when power is supplied to the voice coil 30 and a current flows through the voice coil 30, the voice coil 30 moves back and forth in the axial direction to vibrate the diaphragm 32. When the diaphragm 32 is vibrated, sound is generated.

[0035] (Overall configuration of Case 11) Next, the case 11 that houses the speaker unit 16 will be described.

[0036] As shown in FIG. 3, the case 11 is formed in a box shape to house the speaker unit 16 and is configured to include a peripheral wall portion 11A that surrounds the periphery of the speaker unit 16, a front wall portion 11B arranged at one end side (front side) of the peripheral wall portion 11A, and a rear wall portion 11C arranged at the other end side (rear side) of the peripheral wall portion 11A.

[0037] As shown in FIG. 1, the case 11 is formed in a substantially box-like shape including the case body 14, the front cover 12, and the rear cover 18. The front cover 12 is attached to the front side of the case body 14, and the rear cover 18 is attached to the rear side of the case body 14. Therefore, the peripheral wall portion 11A is formed by the case body 14, the front cover 12 is formed to the front wall portion 11B, and the rear cover 18 is formed to the rear wall portion 11C. Furthermore, the rear cover 18 has an attachment surface 18A arranged to face the attachment target member 100 (see FIG. 4). In this embodiment, the case 11 has a three-part structure including the case body 14, the front cover 12, and the rear cover 18, but is not limited thereto, and may have an integral or two-part structure. The case may also have a structure divided into four or more parts.

[0038] (Case body 14) The case body 14 is in the shape of a generally rectangular cylinder with both sides open, and is formed of a resin material such as a reinforced fiber resin, for example. The speaker unit 16 is held by this case body 14. In addition, a plurality of front projections 34 and a plurality of rear projections 36 are formed on the outer circumferential surface of the case body 14.

[0039] Two front projections 34 are formed on each of the right and left sides of the front of the case body 14, and are configured to engage with front claws 12C of the front cover 12, which will be described later. Two rear projections 36 are formed on each of the right and left sides of the case body 14, rearward of the front projections 34, and are configured to engage with rear claws 18B of the rear cover 18, which will be described later.

[0040] A connector 38 is provided on the left side surface of the case body 14. The connector 38 protrudes leftward from the case body 14, and is connected to a terminal of an external device (not shown).

[0041] The case body 14 is provided with a partition wall 14A that divides the internal space of the case body 14 into a front side and a rear side with the front-rear direction being the plate thickness direction. A circular through hole 14B is formed in the partition wall 14A, and this through hole 14B is adapted to be blocked by the diaphragm 32 of the speaker unit 16.

[0042] Furthermore, the partition wall 14A is provided with a plug 40 made of resin. The plug 40 is attached to a communication portion 14C formed in the partition wall 14A. The communication portion 14C is formed by a through hole having a smaller diameter than the through hole 14B so as to communicate between an external space in front of the partition wall 14A and an internal space behind the partition wall 14A. In addition, the communication portion 14C is provided with a filter member (not shown) that allows air to pass and blocks the passage of liquid, and this filter member is protected by the plug 40.

[0043] (Front cover 12) A front cover 12 is disposed on the front side of the case body 14, and this front cover 12 is attached to the front side (diaphragm 32 side) of the case body 14. The front cover 12 is in the shape of a substantially rectangular plate with the plate thickness direction being the front-to-rear direction, and is formed from a resin member such as, for example, a reinforced fiber resin.

[0044] In addition, the front cover 12 has a plurality of slits 12A formed therein, and sound generated by the vibration of the diaphragm 32 of the speaker unit 16 passes through the slits 12A and is output to the outside of the vehicle electro-acoustic transducer 10.

[0045] Here, a plurality of slits 12A are formed in the left-right direction, and each slit 12A extends in the up-down direction. In addition, as an example, the slits 12A in this embodiment have a labyrinth structure, which is structured to suppress the infiltration of fluid from the front surface (front surface) of the front cover 12 to the rear surface (rear surface).

[0046] Further, the slit 12A is formed in a portion opposite the through hole 14B in the case body 14, and the portion opposite the portion in which the plug 40 (filter member) is provided in the front cover 12 is a blocked portion 12B in which the slit 12A is not formed.

[0047] The front cover 12 is provided with four front claws 12C. Specifically, two front claws 12C extend rearward from the left end of the front cover 12. Similarly, two front claws (not shown) extend rearward from the right end of the front cover 12. A locking hole into which the front protrusion 34 of the case body 14 fits is formed in each front claw 12C, and the front protrusion 34 fits into the locking hole of the front claw 12C to lock the front cover 12.

[0048] (Rear cover 18) A rear cover 18 is disposed on the rear side of the case body 14, and this rear cover 18 is attached to the rear side (the side opposite the diaphragm 32) of the case body 14. The rear cover 18 is in the shape of a substantially rectangular plate with the plate thickness direction being in the front-to-rear direction, and is formed from a resin member such as a reinforced fiber resin, for example. The rear cover 18 seals the space on the side opposite the diaphragm 32 in the case body 14.

[0049] The rear cover 18 is provided with four rear claws 18B. Specifically, two rear claws 18B extend forward from the left end of the rear cover 18. Similarly, two rear claws 18B extend forward from the right end of the front cover 12. A locking hole into which the rear protrusion 36 of the case main body 14 fits is formed in each rear claw 18B, and the rear protrusion 36 fits into the locking hole of the rear claw 18B to lock the rear cover 18.

[0050] A support portion 18C is provided on the front surface (rear surface) of the rear cover 18. The support portion 18C bulges forward from the front surface of the rear cover 18, and the tip of the support portion 18C is formed into a substantially cylindrical shape. As shown in Fig. 2, when the vehicle electroacoustic transducer 10 is assembled, the rear surface of the yoke 20 is pressed against the support portion 18C.

[0051] (Mounting part 42) 3, a mounting surface 18A, which is the rear surface of the rear cover 18, is provided with a mounting portion 42 to be attached to a mounting target member 100. In other words, the mounting portion 42 is formed to bulge from the rear wall portion 11C toward the opposite side to the front wall portion 11B so as to be attachable to the mounting target member 100. The mounting portion 42 is formed on the outside of the rear cover 18, and includes a mounting bracket 44 into which a bolt 102 (see FIG. 4) serving as a fastener is screwed, and a bracket accommodating portion 46 that accommodates the mounting bracket 44.

[0052] The metal fitting accommodating portion 46 is integrally formed with the case body 14 so as to bulge rearward from the mounting surface 18A, and is formed in a generally rectangular shape when viewed from the rear side. Specifically, the metal fitting accommodating portion 46 includes a rear wall 46A, left and right side walls 46B, a lower wall 46C, and an upper wall 46D (see FIG. 4).

[0053] The rear wall 46A constitutes the rear of the metal fitting accommodating portion 46, and extends in the up-down and left-right directions with the front-to-rear direction being the plate thickness direction. An insertion hole 46E is formed in the center of the rear wall 46A. The insertion hole 46E is formed in a substantially circular shape and is sized to allow the insertion of a bolt 102 for fastening the case 11 to the mounting member 100 (see FIG. 4).

[0054] Side walls 46B extend forward from both left and right ends of the rear wall 46A, and each side wall 46B extends in the up-down and front-rear directions with the left-right direction being the plate thickness direction. Each side wall 46B is provided with a reinforcing rib 52. The reinforcing rib 52 is formed in a substantially trapezoidal shape when viewed from the plate thickness direction with the up-down direction being the plate thickness direction. The reinforcing rib 52 connects each of the left and right side walls 46B to the mounting surface 18A.

[0055] Here, a positioning pin 58 is formed on the left side wall 46B. The pin 58 is formed integrally with the metal fitting accommodating portion 46, and protrudes rearward beyond the rear wall 46A. The pin 58 is formed in a substantially cylindrical shape, and is inserted into a positioning hole (not shown) formed in the mounting member 100.

[0056] A lower wall 46C extends forward from the lower end of the rear wall 46A, and extends in the front-rear and left-right directions with the up-down direction being the plate thickness direction. The lower wall 46C is provided with a pair of left and right reinforcing ribs 54. The reinforcing ribs 54 are formed in a substantially triangular shape when viewed from the plate thickness direction with the left-right direction being the plate thickness direction. The reinforcing ribs 54 connect the lower wall 46C and the mounting surface 18A.

[0057] Here, a recessed corner 46F is provided between the left and right side walls 46B and the bottom wall 46C. A notch 46G is formed as a drainage hole for draining water in each of the pair of left and right corners 46F. The notch 46G is formed between the side wall 46B and the bottom wall 46C, and is configured to allow water to be drained from two directions, the up-down direction and the left-right direction. Note that, although only the notch 46G formed in the left corner 46F is visible in FIG. 3, a similar notch 46G is also formed in the right corner 46F.

[0058] Thus, in this embodiment, as an example, the notches 46G are formed in a plurality of locations in the metal fitting accommodating portion 46. Each of the notches 46G is formed by penetrating a portion of the corner portion 46F in a circular shape. The notches 46G are also formed on the opposite side in the up-down direction to an insertion hole 46H, which will be described later, in the metal fitting accommodating portion 46.

[0059] 4, the upper wall 46D extends forward from the upper end of the rear wall 46A and extends in the front-rear and left-right directions with the up-down direction being the plate thickness direction. Also, an insertion hole 46H into which the mounting bracket 44 can be inserted is formed in the upper wall 46D.

[0060] When viewed from above, the insertion hole 46H is formed in a substantially T-shape including a left-right extending portion extending left and right and a front-rear extending portion extending forward from the center of the left-right extending portion. The front-rear extending portion of the insertion hole 46H extends forward beyond the mounting surface 18A of the rear cover 18. Therefore, the mounting portion 42 is formed in a shape that allows the mounting bracket 44 to be attached and detached with a gap S provided between the metal fitting accommodating portion 46 and the mounting bracket 44 when the mounting bracket 44 is accommodated in the metal fitting accommodating portion 46. The gap S is provided between the metal fitting accommodating portion 46 and the mounting bracket 44 in the front-rear extending portion and the left-right extending portion of the insertion hole 46H.

[0061] 5, the inner wall of the metal fitting accommodating portion 46 in the mounting portion 42 includes upper and lower wall portions 42A, an inclined portion 42B, and a front and rear wall portion 42C when viewed from the left and right direction. The upper and lower wall portion 42A constitutes the inner wall on the front side of the insertion hole 46H and extends in the up and down direction. The upper and lower wall portion 42A also extends above the rear wall 46A that faces it in the front and rear direction.

[0062] The inclined portion 42B and the front-rear wall portion 42C form the bottom wall of the insertion hole 46H and extend in the front-rear direction. Here, the front-rear wall portion 42C extends forward from the lower end of the rear wall 46A to the center part of the insertion hole 46H in the front-rear direction. The front-rear wall portion 42C and the upper and lower walls 42A are connected by the inclined portion 42B.

[0063] The inclined portion 42B is inclined downward from the upper and lower wall portions 42A toward the front and rear wall portions 42C. The left and right ends of the front and rear wall portions 42C are connected to the edges that form the notches 46G. In other words, the inclined portion 42B formed on the inner wall of the metal fitting accommodating portion 46 is inclined toward the notches 46G.

[0064] 3 and 4, the mounting bracket 44 is formed as a separate body from the case 11. The mounting bracket 44 is a so-called T-nut that includes a cylindrical portion 44A and a flange portion 44B, and in the present embodiment, as an example, the mounting bracket 44 is formed from a steel material.

[0065] The flange portion 44B extends from the cylindrical portion 44A in the radial direction of the cylindrical portion 44A with the front-rear direction being the plate thickness direction. The flange portion 44B is formed in a horizontally elongated shape with a length in one direction being longer than the length in the other direction of two directions perpendicular to the plate thickness direction. In this embodiment, the flange portion 44B extends in the left-right direction and the up-down direction, and is formed in a horizontally elongated shape with a length in the left-right direction being longer than the length in the up-down direction.

[0066] Further, a threaded hole 44C is formed in the tubular portion 44A of the mounting bracket 44, which communicates with the insertion hole 46E when the mounting bracket 44 is accommodated in the bracket accommodating portion 46 and into which the bolt 102 is screwed. Specifically, as shown in Fig. 5, when the mounting bracket 44 is inserted into the insertion hole 46H of the bracket accommodating portion 46, the threaded hole 44C formed in the mounting bracket 44 communicates with the insertion hole 46E of the bracket accommodating portion 46.

[0067] The mounting portion 42 is configured as described above, and the bolt 102 is inserted into the insertion hole 46E of the metal fitting accommodating portion 46 and screwed into the screw hole 44C of the mounting fitting 44, thereby fixing the mounting portion 42 of the case 11 to the mounted member 100. At this time, the mounted member 100 and the rear wall 46A of the metal fitting accommodating portion 46 are sandwiched between the mounting fitting 44 and the bolt 102.

[0068] (Boss part 60) 3, two boss portions 60 bulge out from the mounting surface 18A of the case 11. Of the two boss portions 60, one boss portion 60 is provided near the lower right corner of the mounting surface 18A, and the other boss portion 60 is provided near the lower left corner of the mounting surface 18A. In other words, the mounting portion 42 is formed at one end of the mounting surface 18A, and the boss portion 60 is formed at the other end of the mounting surface 18A.

[0069] Each boss portion 60 includes a main body portion 60A and a rib 60B. The main body portion 60A is formed in a substantially cylindrical shape, and the tip of the main body portion 60A is formed in a substantially spherical shape. Four ribs 60B are formed at equal intervals around the periphery of the main body portion 60A. Each rib 60B connects the main body portion 60A to the mounting surface 18A.

[0070] 2, the tip of main body 60A of boss 60 is located rearward of rear wall 46A of metal fitting accommodating portion 46 that constitutes mounting portion 42. In other words, the height of boss 60 relative to mounting surface 18A is higher than the height of mounting portion 42 relative to mounting surface 18A. For this reason, when case 11 is attached to planar mounting base 100, main body 60A of boss 60 is pressed against mounting base 100.

[0071] (action) Next, the operation of this embodiment will be described.

[0072] In the vehicle electroacoustic transducer 10 according to this embodiment, a speaker unit 16 is housed in a case 11. As shown in Fig. 3, the case 11 is configured to include a peripheral wall portion 11A, a front wall portion 11B, and a rear wall portion 11C. The case 11 is also formed with an attachment portion 42, so that the case 11 can be attached to a mounting member 100 via the attachment portion 42.

[0073] Here, the mounting portion 42 bulges out from the rear wall portion 11C of the case 11 toward the opposite side (rear side) from the front wall portion 11B side. This allows the case to be mounted in a smaller space than a configuration in which a mounting portion is provided around the peripheral wall portion 11A. That is, in a configuration in which a flange extends in the left-right direction or the up-down direction from the peripheral wall portion 11A of the case 11, the flange may interfere with surrounding components. In contrast, in the vehicle electroacoustic transducer 10 of this embodiment, the mounting portion 42 is provided at a position overlapping with the case 11 in the front-rear direction, so that the case 11 can be mounted to the mounting base 100 even if another component is disposed around the peripheral wall portion 11A.

[0074] Also, in this embodiment, the mounting bracket 44 is inserted into the insertion hole 46H of the bracket accommodating portion 46, which is a so-called outsert structure. This makes it possible to suppress deterioration of the interface between the case 11 and the mounting bracket 44 due to the influence of water, etc., compared to an insert structure in which the mounting bracket 44 is integrally molded with the bracket accommodating portion 46 (case 11).

[0075] 4, in this embodiment, when the case 11 is attached to the workpiece 100 by the fastener bolt 102, the bolt 102 is inserted into the insertion hole 46E formed in the metal fitting accommodating portion 46, and the bolt 102 and the mounting metal fitting 44 are screwed together. This causes the rear wall 46A of the metal fitting accommodating portion 46 to be sandwiched between the mounting metal fitting 44 and the bolt 102, so that the case 11 can be attached to the workpiece 100 more firmly. Then, by attaching the case 11 to the workpiece 100 via the metal accommodating portion 46, the area of ​​contact with the workpiece 100 can be increased, distributing the load.

[0076] Furthermore, in this embodiment, by making the flange portion 44B of the mounting bracket 44 horizontally elongated, even if an impact is input to the mounting portion 42 from the mounted member 100 side, the impact can be dispersed by the flange portion 44B. Furthermore, if the flange portion 44B is a large-diameter circular shape, it would be necessary to enlarge the metal fitting accommodating portion 46 itself, but by making the flange portion 44B horizontally elongated, it is possible to shorten the length in the up-down direction, and it is not necessary to enlarge the metal fitting accommodating portion 46. Furthermore, by making the flange portion 44B horizontally elongated, it is possible to prevent the flange portion 44B from abutting against the metal fitting accommodating portion and causing the mounting bracket 44 to rotate.

[0077] In this embodiment, the gap S is provided between the metal fitting accommodating portion 46 and the mounting metal fitting 44, so that the mounting metal fitting 44 can be easily attached and detached. This improves the efficiency of the work of inserting the mounting metal fitting 44 into the metal fitting accommodating portion 46. Also, the mounting metal fitting 44 can be easily changed to match the specifications of the workpiece 100.

[0078] Furthermore, as shown in FIG. 3, in this embodiment, a notch 46G for draining water is formed in the metal fitting accommodating portion 46. Therefore, even if water enters the metal fitting accommodating portion 46, the water can be drained through the notch 46G, thereby preventing water from remaining in the metal fitting accommodating portion 46.

[0079] In particular, in this embodiment, the notches 46G are formed in the corners 46F on both the left and right sides of the metal fitting accommodating portion 46, which can prevent water from remaining in the corners 46F. Also, compared to a configuration in which the notches 46G are formed in only one location, the drainage performance can be further improved.

[0080] Furthermore, in this embodiment, an insertion hole 46H is formed at the upper end of the metal fitting accommodating portion 46, and the notch 46G is formed at the lower end of the metal fitting accommodating portion 46, which is opposite to the insertion hole 46H. Therefore, even if water seeps deep into the metal fitting accommodating portion 46 from the insertion hole 46H, it can be drained from the notch 46G.

[0081] 5, in this embodiment, an inclined portion 42B is formed on the inner wall of the insertion hole 46H, and water that has entered the metal fitting accommodating portion 46 is guided to the notch portion 46G by the inclined portion 42B. This allows the water inside the metal fitting accommodating portion 46 to be efficiently drained. In this way, according to the vehicle electroacoustic transducer 10 of this embodiment, deterioration of the case 11 due to residual water can be suppressed.

[0082] 3, in the above embodiment, boss portion 60 bulges out from mounting surface 18A of case 11, and boss portion 60 abuts against mounting base 100. As a result, when case 11 is mounted to mounting base 100, case 11 is supported at multiple points by mounting portion 42 and boss portion 60, making it possible to suppress resonance of case 11.

[0083] In particular, in this embodiment, the mounting portion 42 is provided on the upper part of the mounting surface 18A, and two boss portions 60 are provided on the lower part of the mounting surface 18A. This allows the case 11 to abut against the mounting base 100 at three points, effectively suppressing resonance of the case 11. Furthermore, since a gap is provided between the case 11 and the mounting base 100 except for the mounting portion 42 and the boss portions 60, the speaker unit 16 is not affected by heat even in an environment where the mounting base 100 side becomes hot.

[0084] Furthermore, in this embodiment, the boss portion 60 is formed to protrude further rearward than the mounting portion 42, so that when the mounting portion 42 is attached to the workpiece 100, the boss portion 60 can be reliably abutted against the workpiece 100.

[0085] Furthermore, by pressing the boss portion 60 against the mounting member 100, it is possible to suppress the generation of abnormal noise due to vibration of the case 11. That is, if the height of the mounting portion 42 and the height of the boss portion 60 relative to the mounting surface 18A are formed to be the same height, a small gap may be formed between the boss portion 60 and the mounting member 100 due to design errors, assembly errors, etc. In this case, when the vehicle electroacoustic transducer 10 is operated to vibrate the diaphragm 32, abnormal noise may be generated due to contact between the boss portion 60 and the mounting member 100.

[0086] In contrast, by adopting a configuration in which the boss portion 60 is pressed against the workpiece 100 as in this embodiment, there is no small gap between the boss portion 60 and the workpiece 100, and the generation of abnormal noise can be suppressed.

[0087] Furthermore, in this embodiment, the tip of the mounting portion 42, i.e., the rear wall 46A of the metal fitting accommodating portion 46, is formed flat, so that the mounting portion 42 and the workpiece 100 can be attached in a state of surface contact, thereby stabilizing the mounting state.

[0088] In contrast, since the tip of the boss portion 60 is spherical, the boss portion 60 can support the case 11 with the boss portion 60 and the workpiece 100 in point contact.

[0089] In this embodiment, the front cover 12 is attached to the diaphragm 32 side (front side) of the case body 14, and the rear cover 18 is attached to the opposite side (rear side) of the diaphragm 32 of the case body 14. In this way, by providing the front cover 12 and the rear cover 18 in addition to the case body 14 that holds the speaker unit 16, it is only necessary to change the design of the case body 14 when changing the design of the speaker unit 16. In other words, if the internal structure of the case body 14 is changed in accordance with the design change of the speaker unit 16, the speaker unit 16 can be held. Also, if the external structure of the case body 14 is not changed, the front cover 12 and the rear cover 18 can be attached in the same manner as before the design change.

[0090] Furthermore, in this embodiment, the vehicle electro-acoustic transducer 10 can be adapted to changes in the application and usage environment simply by changing the front cover 12 or the rear cover 18. In particular, in this embodiment, the rear cover 18 is formed with the mounting portion 42, so that the vehicle electro-acoustic transducer 10 can be attached simply by changing the rear cover 18 in accordance with the specifications of the attachment member 100. For example, in an environment where multiple fastening portions are required, if the rear cover 18 is changed to prepare a rear cover having multiple mounting portions 42, the vehicle electro-acoustic transducer 10 can be attached without changing the design of the case body 14 and the front cover 12.

[0091] Furthermore, in this embodiment, the rear space in the case body 14 is sealed by the rear cover 18, and the attachment portion 42 is formed on the outside of the rear cover 18. Therefore, compared to a configuration in which the attachment portion 42 communicates with the internal space of the case body 14, it is possible to prevent foreign matter from entering the inside of the case body 14 from the rear cover 18 side.

[0092] 1, in this embodiment, the external space and the internal space of the case body 14 are in communication with each other through the communication portion 14C. As a result, even if the temperature and air pressure change between the external space and the internal space of the case body 14, air flows in and out between the external space and the internal space through the communication portion 14C, so that deformation of the vibration plate 32 can be suppressed. In addition, since the filter member prevents liquid from passing through the communication portion 14C, it is possible to suppress liquid from flowing into the internal space of the case body 14.

[0093] Furthermore, in the above embodiment, sound output from speaker unit 16 is transmitted to the outside through slit 12A formed in front cover 12. Also, since the portion facing plug 40 that protects the filter member is closed portion 12B, the filter member can be well protected even if foreign matter, water droplets, etc. are blown onto front cover 12.

[0094] 〔supplementary explanation〕 Although the vehicle electroacoustic transducer 10 according to the embodiment has been described above, it is needless to say that the present invention can be embodied in various forms without departing from the gist of the present invention. For example, in the above embodiment, as shown in FIG. 3, the mounting portion 42 is provided at the upper end of the mounting surface 18A, but the present invention is not limited to this, and the mounting portion 42 may be provided at another location. That is, the mounting portion 42 may be provided at the center of the mounting surface 18A. Also, a configuration in which a plurality of mounting portions 42 are provided on the mounting surface 18A may be adopted.

[0095] In the above embodiment, the attachment surface 18A is provided with two boss portions 60, but the present invention is not limited to this. For example, the boss portion 60 may not be provided.

[0096] Furthermore, in the above embodiment, as shown in Fig. 1, the speaker unit 16 that generates sound by reciprocating the voice coil 30 is adopted, but the present invention is not limited to this. For example, a speaker unit that generates sound with another structure may be adopted.

[0097] Furthermore, in the above embodiment, the mounting metal fitting 44 is inserted into the insertion hole 46H of the metal fitting accommodating portion 46, which is a so-called outsert structure, but the present invention is not limited to this.

[0098] 3, the notches 46G are formed in the left and right corners 46F of the metal fitting accommodating portion 46, but this is not limiting. For example, notches similar to the notches 46G may be formed in the rear wall 46A, the side wall 46B, and the bottom wall 46C of the metal fitting accommodating portion 46.

[0099] Furthermore, in the above embodiment, as shown in FIG. 5, the inclined portion 42B constituting a part of the inner wall of the metal fitting accommodating portion 46 is inclined toward the notch 46G, but the present invention is not limited to this. For example, in addition to the inclined portion 42B, a configuration in which the front and rear wall portions 42C are inclined toward the notch 46G may be adopted. In this case, if the front and rear wall portions 42C are formed with an inclined portion inclined from the center in the left-right direction toward the right end and an inclined portion inclined from the center in the left-right direction toward the left end, water on the front and rear wall portions 42 can be effectively guided to the notch 46G. In addition, the upper and lower wall portions 42A may be inclined. For example, by inclining the upper and lower wall portions 42A forward from the lower end toward the upper end, water that has entered the metal fitting accommodating portion 46 from the insertion hole 46H can be effectively drained from the insertion hole 46H even when the case 11 is attached to the attachment member 100 so that the upper and lower wall portions 42A are located downward.

[0100] Furthermore, in the above embodiment, the left and right corners 46F are formed as recessed corners, but the present invention is not limited to this and they may be formed as protruding corners. Also, the cutouts 46G may be formed only on the side walls 46B side, or only on the bottom wall 46C side. [Explanation of symbols]

[0101] 10 Vehicle electroacoustic transducer 11 Cases 16 Speaker unit 42 Mounting part 42B Slope 44 Mounting bracket 46 Metal fittings receiving section 46F Corner 46G Notch (drain hole) 46H Insertion hole 100 Mounting member 102 Bolts (fasteners)

Claims

1. A speaker unit that generates sound; a case formed in a box shape to house the speaker unit; a mounting portion formed on the case and capable of being attached to a mounting member outside a vehicle cabin by a fastener; having The mounting portion includes a mounting metal fitting into which the fastener is screwed, and a metal fitting receiving portion that receives the mounting metal fitting, A vehicle electroacoustic transducer, wherein the metal fitting receiving portion is formed with a drainage hole for draining water.

2. The vehicle electroacoustic transducer according to claim 1 , wherein the water drainage holes are formed at a plurality of positions in the metal fitting receiving portion.

3. 3. The vehicle electro-acoustic transducer according to claim 1, wherein the water drainage hole is formed in a corner portion constituting the metal fitting receiving portion.

4. The metal fitting accommodating portion is formed with an insertion hole into which the mounting metal fitting can be inserted, 4. The vehicle electro-acoustic transducer according to claim 1, wherein the water drainage hole is formed on a side of the metal fitting accommodating portion opposite to the insertion hole.

5. 5. The vehicle electro-acoustic transducer according to claim 1, wherein an inner wall of the metal fitting receiving portion is formed with an inclined portion inclined toward the water drainage hole.

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