Vehicle electric acoustic transducer

Abstract

To provide a vehicle electroacoustic transducer which can be attached in a small space.SOLUTION: A vehicle electroacoustic transducer 10 includes: a speaker unit which emits sound; and a case 11 which is formed in a box shape, houses the speaker unit, and has a peripheral wall part 11A enclosing a periphery of the speaker unit, a front wall part 11B disposed at one end side of the peripheral wall part 11A, and a rear wall part 11C disposed at the other end side of the peripheral wall part 11A. The case 11 is formed with an attachment part 42 which may expand from the rear wall part 11C to the opposite side of the front wall part 11B side to be attached to an attached member outside a passenger compartment.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle electroacoustic transducer.

Background Art

[0002] Patent Documents 1 and 2 disclose a vehicle electroacoustic transducer configured by fixing a speaker unit in a main body case. In the vehicle electroacoustic transducer 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, and an air passage member is provided in a communication hole that communicates the spaces to allow air to pass through and block the passage of fluid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in order to attach a vehicle electroacoustic transducer to a member to be attached, it is necessary to provide an attachment portion on a case or the like. Here, in the vehicle electroacoustic transducer described in Patent Document 1 and Patent Document 2, a pair of flanges extend outward from the main body case in opposite directions, and the vehicle electroacoustic transducer is attached to the member to be attached via these flanges. For this reason, a large amount of space is required to attach the vehicle electroacoustic transducer. In particular, when the vehicle electroacoustic transducer is attached outside the vehicle compartment to generate sound outside the vehicle, it is necessary to design the outside of the vehicle compartment compactly to secure space inside the vehicle compartment. Therefore, there is a need for a vehicle electroacoustic transducer that can be attached in a small space.

[0005] An object of the present invention is to provide a vehicle electroacoustic transducer that can be mounted even in a small space.

Means for Solving the Problems

[0006] The vehicle electroacoustic transducer according to the first aspect includes a speaker unit that generates sound, a case formed in a box shape that houses the speaker unit and includes a peripheral wall portion that surrounds the periphery of the speaker unit, a front wall portion disposed on one end side of the peripheral wall portion, and a rear wall portion disposed on the other end side of the peripheral wall portion, and the case has an attachment portion formed to bulge from the rear wall portion to the side opposite to the front wall portion side so as to be attachable to an attachment member outside the vehicle compartment.

[0007] In the above aspect, the speaker unit is housed in the case, and the case is configured to include a peripheral wall portion, a front wall portion, and a rear wall portion. Further, since the attachment portion is formed in the case, the case can be attached to an attachment member outside the vehicle compartment via this attachment portion.

[0008] Here, the attachment portion bulges from the rear wall portion of the case to the side opposite to the front wall portion side. Thereby, compared with the configuration in which the attachment portion is provided around the peripheral wall portion, the case can be attached even in a small space.

[0009] The vehicle electroacoustic transducer according to the second aspect is, in the first aspect, the attachment portion includes an attachment fitting separate from the case and a fitting housing portion formed integrally with the case and having an insertion hole into which the attachment fitting can be inserted.

[0010] In the above aspect, since it has a so-called outsert structure in which the attachment fitting is inserted into the insertion hole of the fitting housing portion, water is less likely to remain at the interface between the case and the attachment fitting compared with an insert structure in which the attachment fitting is integrally molded with the case. Thereby, it is possible to suppress the interface between the case and the attachment fitting from deteriorating due to the influence of water or the like.

[0011] In the third aspect, the vehicle electro-acoustic transducer according to the second aspect, in the metal fitting housing portion, an insertion hole through which a fastener can be inserted is formed, and in the mounting metal fitting, a screw hole that communicates with the insertion hole and into which the fastener is screwed is formed in a state where the mounting metal fitting is housed in the metal fitting housing portion.

[0012] In the above aspect, when the case is attached to the member to be attached by the fastener, the fastener and the mounting metal fitting are screwed together with the fastener inserted through the insertion hole formed in the metal fitting housing portion. As a result, since the metal fitting housing portion is sandwiched between the mounting metal fitting and the fastener, the case can be more firmly attached to the member to be attached.

[0013] The vehicle electro-acoustic transducer according to the fourth aspect, in the third aspect, the mounting metal fitting includes a cylindrical portion in which the screw hole is formed and a flange portion extending from the cylindrical portion in the radial direction of the cylindrical portion, and the flange portion is formed in a horizontally long shape in which the length in one direction is longer than the length in the other direction among the two directions orthogonal to the plate thickness direction.

[0014] In the above aspect, by making the flange portion of the mounting metal fitting horizontally long, even when an impact is input to the mounting portion from the member to be attached side, the impact can be dispersed by the flange portion. Also, when the flange portion is a large-diameter circle, it is necessary to increase the size of the metal fitting housing portion itself, but by making the flange portion horizontally long, the length in the other direction becomes short, so there is no need to increase the size of the metal fitting housing portion.

[0015] The vehicle electro-acoustic transducer according to the fifth aspect, in any one of the second aspect to the fourth aspect, the mounting portion is formed such that a gap is provided between the metal fitting housing portion and the mounting metal fitting in a state where the mounting metal fitting is housed in the metal fitting housing portion, and the mounting metal fitting is detachable.

[0016] In the above aspect, since a gap is provided between the fitting housing portion and the mounting fitting, the mounting fitting can be easily attached and detached. Thereby, the working efficiency of the operation of inserting the mounting fitting into the fitting housing portion can be improved. Further, the mounting fitting can be easily changed according to the specifications of the member to be mounted and the like.

Effect of the Invention

[0017] According to the vehicle electric acoustic transducer of the present invention, it can be mounted even in a small space.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0019] The vehicle electric acoustic transducer 10 according to the embodiment will be described with reference to the drawings. Note that the arrows FR, UP, and RH appropriately shown in each figure indicate the front direction, the upward direction, and the right direction in the vehicle electric acoustic transducer 10, respectively. However, the front-rear direction, the up-down direction, and the left-right direction of the vehicle electric acoustic transducer 10 are set for convenience of explanation and do not necessarily coincide with the front-rear direction, the up-down direction, and the left-right direction in the state where the vehicle electric acoustic transducer 10 is attached to the member to be attached.

[0020] (Overall Configuration of Vehicle Electric Acoustic Transducer 10) As shown in Fig. 1, the vehicle electroacoustic transducer 10 of the present embodiment mainly includes 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 speaker unit 16 is housed in this case 11.

[0021] Here, as an example, the vehicle electroacoustic transducer 10 of the present embodiment is mounted in a power unit chamber provided outside the vehicle compartment of the vehicle, and is configured to be attached to an attachment member 100 (see Fig. 4) disposed in the power unit chamber. Further, as an example, the vehicle electroacoustic transducer 10 of the present embodiment is used as an Acoustic Vehicle Alerting System (AVAS) that generates a sound during low-speed driving in a state of being mounted on the vehicle to notify pedestrians of the approach of the vehicle.

[0022] First, the speaker unit 16 that constitutes the vehicle electroacoustic transducer 10 of the present embodiment will be described, and then the details of the front cover 12, the case body 14, and the rear cover 18 that constitute the case 11 will be described.

[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] As shown in Fig. 2, the frame 22 has a substantially stepped cylindrical shape including a small-diameter portion 22A and a tapered portion 22B, and is formed of a resin member as an example. Further, the small-diameter portion 22A of the frame 22 is disposed on the rear side, the tapered portion 22B is disposed on the front side, and the central axis CL direction 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 in the central axis CL direction, and the rear side of the speaker unit 16 may be referred to as the other side in the central axis CL direction.

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

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

[0027] Also, the one axial side portion of the frame 22 is connected to the one axial end portion of a case body 14 described later. For this reason, the external space and the internal space of the case body 14 are partitioned by the diaphragm 32.

[0028] On the other hand, a yoke 20, a magnet 24, and a top plate 26 are disposed inside the small-diameter portion 22A of the frame 22. The yoke 20 has a bottomed cylindrical shape with an open front side and is formed of a magnetic material. Also, the front end portion of the yoke 20 abuts against the frame 22, and the rear end portion of the yoke 20 abuts against the rear cover 18. For this reason, the yoke 20 is held in a state of being sandwiched between the frame 22 and the rear cover 18 described later.

[0029] The magnet 24 has a substantially cylindrical shape with a smaller diameter than the yoke 20. As an example, the magnet 24 in this embodiment is formed of a neodymium magnet. Also, the magnet 24 is disposed inside the yoke 20, and the rear surface of the magnet 24 abuts against 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 has a substantially cylindrical shape thinner than the magnet 24 and is formed of a magnetic material. A magnetic circuit is constituted by the yoke 20, the magnet 24, and the top plate 26.

[0031] A gap is provided between the top plate 26 and the yoke 20, and the axially other end portion of the voice coil 30 enters this gap. The voice coil 30 is formed by cylindrically winding a conducting wire around a bobbin (not shown), and the outer diameter of the voice coil 30 is slightly larger than those of the magnet 24 and the top plate 26. One axially end portion of the voice coil 30 is fixed to the central portion of the diaphragm 32, and the diaphragm 32 is configured to be deformed according to the displacement of the voice coil 30.

[0032] A damper 28 is fixed to the outer peripheral surface of the voice coil 30. The damper 28 has a substantially disc shape with a radially central portion opened and is formed of a flexible member. Further, the cross-sectional shape of the damper 28 is formed in a substantially corrugated shape. The inner peripheral end portion of the damper 28 is fixed to the axially central portion of the voice coil 30, and the outer peripheral end portion of the damper 28 is fixed to the frame 22. For this reason, the voice coil 30 is supported by the damper 28 so as to be axially movable inside the frame 22.

[0033] Here, both end portions of the conducting wire constituting the voice coil 30 are connected to terminals (not shown), and electric power is supplied to the voice coil 30 from an external power source of the vehicle electric acoustic transducer 10 via the terminals.

[0034] The speaker unit 16 is configured as described above. When electric power is supplied to the voice coil 30 and an electric current flows through the voice coil 30, the voice coil 30 reciprocates axially to vibrate the diaphragm 32. Then, when the diaphragm 32 is vibrated, sound is generated.

[0035] (Overall configuration of the 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 includes a peripheral wall portion 11A that surrounds the periphery of the speaker unit 16, a front wall portion 11B disposed on one end side (front side) of the peripheral wall portion 11A, and a rear wall portion 11C disposed on the other end side (rear side) of the peripheral wall portion 11A.

[0037] Also, as shown in FIG. 1, the case 11 is formed in a substantially box shape including a case body 14, a front cover 12, and a 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. For this reason, the peripheral wall portion 11A is constituted by the case body 14, the front wall portion 11B is constituted by the front cover 12, and the rear wall portion 11C is constituted by the rear cover 18. Further, the rear cover 18 includes an attachment surface 18A that is disposed to face the attachment member 100 (see FIG. 4). In the present embodiment, the case 11 has a three-part structure of 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. Also, the case may have a structure divided into four or more parts.

[0038] (Case body 14) The case body 14 is formed in a substantially rectangular tube shape with both sides open, and is formed of a resin member such as a reinforced fiber resin as an example. The speaker unit 16 is held by this case body 14. Further, a plurality of front side protrusions 34 and a plurality of rear side protrusions 36 are formed on the outer peripheral surface of the case body 14.

[0039] The front protrusions 34 are each formed in two on the right and left side surfaces at the front portion of the case body 14, and are configured such that the front claw portions 12C of the front cover 12, which will be described later, are locked thereto. Further, the rear protrusions 36 are each formed in two on the right and left side surfaces of the case body 14 on the rear side of the front protrusions 34, and are configured such that the rear claw portions 18B of the rear cover 18, which will be described later, are locked thereto.

[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 terminals on the external device side (not shown) and the like are connected to this connector 38.

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

[0042] Furthermore, a resin plug 40 is provided on the partition wall 14A. 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 the external space on the front side of the partition wall 14A and the internal space on the rear side of the partition wall 14A. Further, a filter member (not shown) that allows air to pass through and blocks the passage of liquid is provided in the communication portion 14C, and this filter member is protected by the plug 40.

[0043] (Front Cover 12) The 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 formed in a substantially rectangular plate shape with the front-rear direction as the plate thickness direction, and is formed of a resin member such as a reinforced fiber resin as an example.

[0044] Further, a plurality of slits 12A are formed in the front cover 12, and the 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 electric 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. Further, as an example, the slit 12A of the present embodiment has a labyrinth structure and is structured to suppress the intrusion of fluid from the front surface (outer surface) to the rear surface (inner surface) of the front cover 12.

[0046] Also, the slit 12A is formed in a portion facing the through - hole 14B in the case body 14, and the portion facing the portion where the plug 40 (filter member) is provided in the front cover 12 is a closed portion 12B where the slit 12A is not formed.

[0047] Four front - side claw portions 12C are provided on the front cover 12. Specifically, two front - side claw portions 12C extend from the left - hand end portion of the front cover 12 toward the rear side. Similarly, two front - side claw portions (not shown) extend from the right - hand end portion of the front cover 12 toward the rear side. Locking holes into which the front - side protrusion portion 34 of the case body 14 fits are formed in each of the front - side claw portions 12C, and the front cover 12 is locked by the front - side protrusion portion 34 fitting into the locking holes of the front - side claw portions 12C.

[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 of the case body 14 (the side opposite to the diaphragm 32). The rear cover 18 has a substantially rectangular plate shape with the front - rear direction as the plate - thickness direction, and is formed of a resin member such as a reinforced fiber resin as an example. And the space on the side of the case body 14 opposite to the diaphragm 32 is sealed by the rear cover 18.

[0049] The rear cover 18 is provided with four rear-side claw portions 18B. Specifically, two rear-side claw portions 18B extend forward from the left end portion of the rear cover 18. Similarly, two rear-side claw portions 18B extend forward from the right end portion of the front cover 12. A locking hole into which the rear-side protrusion 36 of the case body 14 enters is formed in each rear-side claw portion 18B, and the rear cover 18 is locked by the rear-side protrusion 36 entering the locking hole of the rear-side claw portion 18B.

[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 in a substantially cylindrical shape. And, as shown in FIG. 2, in a state where the vehicle electric acoustic transducer 10 is assembled, the rear surface of the yoke 20 is configured to be pressed against the support portion 18C.

[0051] (Mounting portion 42) As shown in FIG. 3, a mounting portion 42 for mounting to the member to be mounted 100 is provided on the mounting surface 18A which is the rear surface of the rear cover 18. In other words, the mounting portion 42 bulges from the rear wall portion 11C to the side opposite to the front wall portion 11B side and is formed to be mountable to the member to be mounted 100. The mounting portion 42 is formed on the outside of the rear cover 18 and includes a mounting bracket 44 to which a bolt 102 (see FIG. 4), which is a fastening tool, is screwed, and a bracket housing portion 46 for housing the mounting bracket 44.

[0052] The bracket housing portion 46 is formed integrally with the case body 14 so as to bulge rearward from the mounting surface 18A, and is formed in a substantially rectangular shape when viewed from the rear side. Specifically, the bracket housing 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 part of the fitting housing portion 46 and extends in the vertical and horizontal directions with the front-rear direction as the plate thickness direction. Further, an insertion hole 46E is formed in the central portion of the rear wall 46A. The insertion hole 46E is formed in a substantially circular shape and has a size that allows a bolt 102 for fastening the case 11 to the attached member 100 to be inserted (see FIG. 4).

[0054] Side walls 46B extend forward from both left and right end portions of the rear wall 46A. Each of the side walls 46B extends in the vertical and front-rear directions with the left-right direction as the plate thickness direction. Further, reinforcing ribs 52 are provided on each of the side walls 46B. The reinforcing ribs 52 are formed in a substantially trapezoidal shape when viewed from the plate thickness direction with the vertical direction as the plate thickness direction. And the left and right side walls 46B and the mounting surface 18A are connected by the reinforcing ribs 52.

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

[0056] A lower wall 46C extends forward from the lower end portion of the rear wall 46A. The lower wall 46C extends in the front-rear and left-right directions with the vertical direction as the plate thickness direction. Further, a pair of left and right reinforcing ribs 54 are provided on the lower wall 46C. The reinforcing ribs 54 are formed in a substantially triangular shape when viewed from the plate thickness direction with the left-right direction as the plate thickness direction. And the lower wall 46C and the mounting surface 18A are connected by the reinforcing ribs 54.

[0057] Here, a corner portion 46F in the shape of an inner corner is provided between the left and right side walls 46B and the lower wall 46C. And, drain notches 46G are respectively formed in a pair of left and right corner portions 46F. The drain notch 46G is formed across the side wall 46B and the lower wall 46C, and is configured to be able to drain water from two directions, the vertical direction and the horizontal direction. In FIG. 3, only the drain notch 46G formed in the left corner portion 46F is visible, but the drain notch 46G is also formed in the right corner portion 46F in the same manner.

[0058] As described above, in this embodiment, as an example, drain notches 46G are formed at a plurality of locations in the fitting housing portion 46. And each drain notch 46G is formed by penetrating a part of the corner portion 46F in a circular shape. Further, the drain notch 46G is formed on the side opposite to the insertion hole 46H (to be described later) in the fitting housing portion 46 in the vertical direction.

[0059] As shown in FIG. 4, the upper wall 46D extends forward from the upper end of the rear wall 46A and extends in the front-rear direction and the left-right direction with the vertical direction as the plate thickness direction. Further, an insertion hole 46H into which the mounting fitting 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 central portion of the left-right extending portion. Further, the front-rear extending portion in the insertion hole 46H extends forward beyond the mounting surface 18A of the rear cover 18. For this reason, the mounting portion 42 is formed in a shape in which a gap S is provided between the fitting housing portion 46 and the mounting fitting 44 so that the mounting fitting 44 can be attached and detached with the mounting fitting 44 accommodated in the fitting housing portion 46. The gap S is provided between the fitting housing portion 46 and the mounting fitting 44 in the front-rear extending portion and the left-right extending portion of the insertion hole 46H.

[0061] As shown in FIG. 5, the inner wall of the fitting housing portion 46 in the mounting portion 42 is configured to include an upper and lower wall portion 42A, an inclined portion 42B, and a front and rear wall portion 42C when viewed from the left - 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 - down direction. Also, the upper and lower wall portion 42A extends above the rear wall 46A that faces in the front - rear direction.

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

[0063] The inclined portion 42B is inclined downward from the upper and lower wall portion 42A toward the front and rear wall portion 42C. And both left and right end portions in the front and rear wall portion 42C are respectively connected to the edges forming the notch portion 46G. In other words, the inclined portion 42B formed on the inner wall of the fitting housing portion 46 is inclined toward the notch portion 46G.

[0064] As shown in FIGS. 3 and 4, the mounting fitting 44 is formed separately from the case 11. The mounting fitting 44 is a so - called T - nut including a cylindrical portion 44A and a flange portion 44B. In this embodiment, as an example, the mounting fitting 44 is formed of 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 as the plate - thickness direction. Also, the flange portion 44B is formed in a horizontally long shape in which the length in one direction among the two directions orthogonal to the plate - thickness direction is longer than the length in the other 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 long shape in which the length in the left - right direction is longer than the length in the up - down direction.

[0066] Further, in the cylindrical portion 44A of the mounting fitting 44, a screw hole 44C is formed which communicates with the insertion hole 46E in a state where the mounting fitting 44 is housed in the fitting housing portion 46 and into which the bolt 102 is screwed. Specifically, as shown in FIG. 5, with the mounting fitting 44 inserted into the insertion hole 46H of the fitting housing portion 46, the screw hole 44C formed in the mounting fitting 44 communicates with the insertion hole 46E of the fitting housing portion 46.

[0067] The mounting portion 42 is configured as described above. By inserting the bolt 102 through the insertion hole 46E of the fitting housing portion 46 and screwing the bolt 102 into the screw hole 44C of the mounting fitting 44, the mounting portion 42 of the case 11 is fixed to the member to be mounted 100. At this time, the member to be mounted 100 and the rear wall 46A of the fitting housing portion 46 are sandwiched between the mounting fitting 44 and the bolt 102.

[0068] (boss portion 60) As shown in FIG. 3, two boss portions 60 bulge 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 portion on the mounting surface 18A, and the other boss portion 60 is provided near the lower left corner portion on the mounting surface 18A. In other words, the mounting portion 42 is formed at one end portion of the mounting surface 18A, and the boss portion 60 is formed at the other end portion of the mounting surface 18A.

[0069] Each boss portion 60 includes a main body portion 60A and ribs 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 main body portion 60A. Each rib 60B connects the main body portion 60A and the mounting surface 18A.

[0070] Here, as shown in FIG. 2, the tip of the main body portion 60A of the boss portion 60 is located on the rear side of the rear wall 46A of the fitting housing portion 46 that constitutes the mounting portion 42. That is, the height of the boss portion 60 with respect to the mounting surface 18A is higher than the height of the mounting portion 42 with respect to the mounting surface 18A. Therefore, when the case 11 is mounted on the flat mounting member 100, the main body portion 60A of the boss portion 60 is pressed against the mounting member 100.

[0071] (Operation) Next, the operation of the present embodiment will be described.

[0072] In the vehicle electroacoustic transducer 10 according to the present embodiment, the speaker unit 16 is housed in the case 11. Further, 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. Further, since the mounting portion 42 is formed on the case 11, the case 11 can be mounted on the mounting member 100 via this mounting portion 42.

[0073] Here, the mounting portion 42 bulges from the rear wall portion 11C of the case 11 to the side opposite to the front wall portion 11B side (rear side). Thereby, compared with the configuration in which the mounting portion is provided around the peripheral wall portion 11A, the case can be mounted even in a small space. That is, in a configuration in which a flange extends from the peripheral wall portion 11A of the case 11 in the left-right direction or the up-down direction, the flange may interfere with peripheral components. On the other hand, in the vehicle electroacoustic transducer 10 of the present embodiment, since the mounting portion 42 is provided at a position overlapping the case 11 in the front-rear direction, the case 11 can be mounted on the mounting member 100 even when another component is disposed around the peripheral wall portion 11A.

[0074] Further, in the present embodiment, a so-called out-sert structure is adopted in which the mounting bracket 44 is inserted into the insertion hole 46H of the bracket housing portion 46. Thereby, compared with the insert structure in which the mounting bracket 44 is integrally formed with the bracket housing portion 46 (case 11), it is possible to suppress deterioration of the interface between the case 11 and the mounting bracket 44 due to the influence of water or the like.

[0075] Furthermore, as shown in FIG. 4, in the present embodiment, when the case 11 is attached to the member 100 to be attached by the bolt 102 which is a fastener, the bolt 102 and the mounting bracket 44 are screwed together with the bolt 102 inserted through the insertion hole 46E formed in the fitting housing portion 46. As a result, the rear wall 46A of the fitting housing portion 46 is sandwiched between the mounting bracket 44 and the bolt 102, so that the case 11 can be more firmly attached to the member 100 to be attached. Then, by attaching the case 11 to the member 100 to be attached via the metal housing portion 46, the area of contact with the member 100 to be attached can be increased, and the load can be dispersed.

[0076] Furthermore, in the present embodiment, by making the flange portion 44B of the mounting bracket 44 horizontally long, even when an impact is input to the mounting portion 42 from the member 100 to be attached, the impact can be dispersed by the flange portion 44B. Also, when the flange portion 44B is a large-diameter circle, it is necessary to increase the size of the fitting housing portion 46 itself, but by making the flange portion 44B horizontally long, the length in the vertical direction can be shortened, and there is no need to increase the size of the fitting housing portion 46. Furthermore, by making the flange portion 44B horizontally long, it is possible to suppress the flange portion 44B from contacting the fitting housing portion and the mounting bracket 44 from rotating.

[0077] Also, in the present embodiment, since a gap S is provided between the fitting housing portion 46 and the mounting bracket 44, the mounting bracket 44 can be easily attached and detached. Thereby, the working efficiency of the operation of inserting the mounting bracket 44 into the fitting housing portion 46 can be improved. Also, the mounting bracket 44 can be easily changed according to the specifications of the member 100 to be attached.

[0078] Furthermore, as shown in FIG. 3, in the present embodiment, since the fitting housing portion 46 is formed with a notch portion 46G for draining water, even when water enters the fitting housing portion 46, the water can be drained from the notch portion 46G, and it is possible to suppress the water from remaining in the fitting housing portion 46.

[0079] In particular, in the present embodiment, since the notch portions 46G are formed at the corner portions 46F on both the left and right sides of the fitting housing portion 46, it is possible to suppress water from remaining at the corner portions 46F. Further, compared with a configuration in which the notch portions 46G are formed only at one location, the drainage performance can be further improved.

[0080] Furthermore, in the present embodiment, an insertion hole 46H is formed at the upper end portion of the fitting housing portion 46, and the notch portion 46G is formed at the lower end portion of the fitting housing portion 46 on the side opposite to the insertion hole 46H. Therefore, even when water enters from the insertion hole 46H to the depth of the fitting housing portion 46, it can be drained from the notch portion 46G.

[0081] Furthermore, as shown in FIG. 5, in the present embodiment, an inclined portion 42B is formed on the inner wall of the insertion hole 46H, and the water that has entered the fitting housing portion 46 is guided to the notch portion 46G by the inclined portion 42B. Thereby, the water in the fitting housing portion 46 can be efficiently drained. Thus, according to the vehicle electric acoustic transducer 10 of the present embodiment, deterioration of the case 11 due to water remaining can be suppressed.

[0082] Also, as shown in FIG. 3, in the above embodiment, the boss portion 60 bulges from the mounting surface 18A of the case 11, and the boss portion 60 abuts against the member 100 to be mounted. Thereby, in a state where the case 11 is attached to the member 100 to be mounted, the case 11 is supported at a plurality of locations of the mounting portion 42 and the boss portion 60, and resonance of the case 11 can be suppressed.

[0083] In particular, in the present embodiment, the mounting portion 42 is provided at the upper portion of the mounting surface 18A, and two boss portions 60 are provided at the lower portion of the mounting surface 18A. Thereby, since the case 11 abuts against the member 100 to be mounted at three locations, resonance of the case 11 can be effectively suppressed. Further, since a gap is provided between the case 11 and the member 100 to be mounted except for the mounting portion 42 and the boss portion 60, even in an environment where the member 100 to be mounted side becomes high temperature, the speaker unit 16 can be free from the influence of heat.

[0084] Furthermore, in the present embodiment, since the boss portion 60 protrudes rearward more than the attachment portion 42, when attaching the attachment portion 42 to the attached member 100, the boss portion 60 can be surely brought into contact with the attached member 100.

[0085] Also, by pressing the boss portion 60 against the attached member 100, it is possible to suppress the generation of abnormal noise due to the vibration of the case 11. That is, when the height of the attachment portion 42 and the height of the boss portion 60 with respect to the attachment surface 18A are formed to be the same height, there may be a slight gap between the boss portion 60 and the attached member 100 due to design errors and assembly errors. In this case, when the vehicle electric acoustic transducer 10 is operated and the diaphragm 32 vibrates, abnormal noise may be generated due to the contact between the boss portion 60 and the attached member 100.

[0086] On the other hand, by adopting a configuration in which the boss portion 60 is pressed against the attached member 100 as in the present embodiment, no slight gap is provided between the boss portion 60 and the attached member 100, and the generation of abnormal noise can be suppressed.

[0087] Moreover, in the present embodiment, since the tip of the attachment portion 42, that is, the rear wall 46A of the fitting housing portion 46 is formed in a flat surface, the attachment portion 42 and the attached member 100 can be attached in a state of surface contact, and the attachment state can be stabilized.

[0088] On the other hand, since the tip of the boss portion 60 is spherical, the case 11 can be supported by the boss portion 60 in a state where the boss portion 60 and the attached member 100 are in point contact.

[0089] Also, in the present embodiment, a front cover 12 is attached to the diaphragm 32 side (front side) of the case body 14, and a rear cover 18 is attached to the side of the case body 14 opposite to the diaphragm 32 (rear side). In this way, by adopting a configuration including the front cover 12 and the rear cover 18 separately from the case body 14 that holds the speaker unit 16, when the design of the speaker unit 16 is changed, only the case body 14 needs to be redesigned. That is, by changing the internal structure of the case body 14 according to 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 way as before the design change.

[0090] Furthermore, in the present embodiment, by simply changing the front cover 12 or the rear cover 18, it is possible to cope with changes in the application and usage environment of the vehicle electro-acoustic transducer 10. In particular, in the present embodiment, since the attachment portion 42 is formed on the rear cover 18, the vehicle electro-acoustic transducer 10 can be attached only by changing the rear cover 18 according to the specifications of the member to be attached 100. For example, in an environment where fastening portions at a plurality of locations are required, if the rear cover 18 is changed to prepare a rear cover with a plurality of attachment portions 42 formed, the vehicle electro-acoustic transducer 10 can be attached without changing the designs of the case body 14 and the front cover 12.

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

[0092] Also, as shown in FIG. 1, in the present embodiment, the external space and the internal space of the case body 14 communicate with each other through the communication portion 14C. Thereby, even when the temperature, the air pressure, etc. change between the external space and the internal space of the case body 14, air can enter and exit between the external space and the internal space through the communication portion 14C, suppressing deformation of the diaphragm 32. Further, since the liquid cannot pass through the communication portion 14C by the filter member, it is possible to suppress the inflow of the liquid into the internal space of the case body 14.

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

[0094] 〔Supplementary Explanation〕 As described above, the vehicle electric acoustic transducer 10 according to the embodiment has been described. However, it goes without saying that it can be implemented in various modes 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 portion of the mounting surface 18A, but it is not limited to this, and the mounting portion 42 may be provided at other locations. That is, the mounting portion 42 may be provided at the central portion 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] Also, in the above embodiment, two boss portions 60 are provided on the mounting surface 18A, but it is not limited to this. For example, a configuration without the boss portion 60 may be adopted.

[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 it is not limited to this. For example, a speaker unit that generates sound with another structure may be adopted.

[0097] Furthermore, in the above-described embodiment, the mounting bracket 44 is inserted into the insertion hole 46H of the bracket housing portion 46, which is a so-called outsert structure, but the present invention is not limited thereto.

Explanation of Reference Numerals

[0098] 10 Electric acoustic transducer for vehicle 11 Case 11A Peripheral wall portion 11B Front wall portion 11C Rear wall portion 16 Speaker unit 42 Mounting portion 44 Mounting bracket 44A Cylindrical portion 44B Flange portion 44C Threaded hole 46 Bracket housing portion 46E Insertion hole 100 Member to be mounted S Gap

Claims

1. A speaker unit that generates sound, A case formed in a box shape for accommodating the speaker unit, including a peripheral wall portion that surrounds the periphery of the speaker unit, a front wall portion disposed on one end side of the peripheral wall portion, and a rear wall portion disposed on the other end side of the peripheral wall portion, having, In the case, a mounting portion is formed that bulges from the rear wall portion to the side opposite to the front wall portion side and can be mounted on a mounted member outside the vehicle compartment. The mounting portion includes a mounting bracket separate from the case and a bracket housing portion formed integrally with the case and having an insertion hole into which the mounting bracket can be inserted. An insertion hole through which a fastener can be inserted is formed in the wall portion of the bracket housing portion on the side opposite to the front wall portion side from the rear wall portion. In the mounting bracket, a screw hole is formed that communicates with the insertion hole in a state where the mounting bracket is accommodated in the bracket housing portion and with which the fastener is screwed. By screwing the fastener into the screw hole, the mounting portion is fixed to the mounted member in a state where the mounted member and the bracket housing portion are sandwiched between the mounting bracket and the fastener. A vehicle electric acoustic transducer in which a gap is provided between the mounting bracket and the inner wall on the front wall portion side in the bracket housing portion in a state where the mounting bracket is accommodated in the bracket housing portion.

2. The vehicle electric acoustic transducer according to claim 1, wherein the bracket housing portion includes a rear wall in which the insertion hole is formed, side walls extending from both left and right end portions of the rear wall to the front wall portion side, a lower wall extending from the lower end of the rear wall to the front wall portion side, and an upper wall extending from the upper end of the rear wall to the front wall portion side.

3. The mounting bracket includes a cylindrical portion in which the screw hole is formed and a flange portion extending from the cylindrical portion in the radial direction of the cylindrical portion. The vehicle electric acoustic transducer according to claim 1 or 2, wherein the flange portion is formed in a horizontally long shape in which the length in one direction is longer than the length in the other direction among the two directions orthogonal to the plate thickness direction.

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