Acoustic device

Abstract

An acoustic device is provided with: a vibration plate that generates sound by vibration; a frame supporting the vibration plate; a stopper that is provided between the diaphragm and the frame, and that, when the diaphragm is pressed toward the frame side, a part of the diaphragm comes into contact with the stopper and suppresses deformation of the diaphragm; when the vibrating plate is pressed toward the frame side, the vibrating plate is in line contact with the stopper.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a sound device. BACKGROUND

[0002] Japanese Patent Application Publication No. 2021-034864 discloses a sound device that has a vibration body having a vibration plate portion and a rim portion joined to an outer peripheral portion of the vibration plate portion, and that emits sound by vibration of the vibration body. In the sound device described in this document, an inner space of a main body case and an outer space are divided by the vibration body. In addition, a vibration body restriction portion is provided at a position opposite the rim portion of the vibration body. When the air pressure in the inner space of the main body case drops sharply, the vibration body is attracted toward the inside of the main body case, and at this time, the rim portion of the vibration body comes into contact with the vibration body restriction portion. Thus, reverse deformation of the rim portion is suppressed. SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION

[0003] However, the structure of the sound device described in Japanese Patent Application Publication No. 2021-034864 is effective in terms of suppressing reverse deformation of the rim portion when the air pressure in the inner space of the main body case drops sharply, but there is room for improvement in terms of suppressing deformation of the vibration plate (vibration plate portion).

[0004] The present disclosure takes the above facts into consideration, and aims to provide a sound device that can suppress deformation of a vibration plate. MEANS FOR SOLVING THE PROBLEMS

[0005] The sound device of the first aspect includes: a vibration plate that emits sound by vibration; a frame that supports the vibration plate; a stopper portion that is provided between the vibration plate and the frame, and that abuts against and suppresses deformation of the vibration plate when the vibration plate is pressed toward the frame side; and wherein the vibration plate and the stopper portion are in line contact when the vibration plate is pressed toward the frame side.

[0006] In the sound device of the first aspect, the vibration plate emits sound by vibration, and the vibration plate is supported by the frame. In the sound device of the first aspect, the vibration plate and the stopper portion are in line contact when the vibration plate is pressed toward the frame side. Thus, deformation of the vibration plate when the vibration plate is pressed toward the frame side can be suppressed.

[0007] The sound device of the second aspect is the sound device of the first aspect, wherein the outer peripheral portion of the vibration plate and the frame are connected by a rim member, a portion of the rim member deforms in conjunction with vibration of the vibration plate, a portion of the rim member and the outer peripheral portion of the vibration plate are joined in a state of overlapping each other to form a joint portion, and the joint portion and the stopper portion abut against each other when the vibration plate is pressed toward the frame side.

[0008] In the acoustic device of the second aspect, the outer peripheral portion of the diaphragm is connected to the frame by an edge member, and a portion of the edge member deforms in conjunction with vibration of the diaphragm. Here, a portion of the edge member is joined to the outer peripheral portion of the diaphragm in a state of overlapping each other to form a joint portion. Also, in the acoustic device of the second aspect, when the diaphragm is pressed toward the frame side, the joint portion abuts against the stop portion. Thus, deformation of the diaphragm when pressed toward the frame side can be suppressed.

[0009] In the acoustic device of the third aspect, in the acoustic device of the second aspect, a thickness of the portion of the edge member that is joined to the outer peripheral portion of the diaphragm is greater than a thickness of the portion of the edge member that deforms in conjunction with vibration of the diaphragm.

[0010] In the acoustic device of the third aspect, compared to a structure in which the thickness of the portion of the edge member that is joined to the outer peripheral portion of the diaphragm and the thickness of the portion of the edge member that deforms in conjunction with vibration of the diaphragm are set to the same size, the outer peripheral portion of the diaphragm can be effectively reinforced by the edge member, that is, the joint portion that abuts against the stop portion can be effectively reinforced.

[0011] In the acoustic device of the fourth aspect, in any one of the acoustic devices of the first to third aspects, a voice coil is fixed to an inner peripheral portion of the diaphragm, and the voice coil is connected to the frame by a damper; a damper restriction portion that restricts displacement of the damper toward the frame side is provided in the frame; and a distance by which the voice coil moves to a position at which the damper abuts against the damper restriction portion is set to be greater than or equal to a distance by which the voice coil moves to a position at which the diaphragm abuts against the stop portion.

[0012] In the acoustic device of the fourth aspect, the distance by which the voice coil moves to the position at which the damper abuts against the damper restriction portion is set to be greater than or equal to the distance by which the voice coil moves to the position at which the diaphragm abuts against the stop portion. Thus, movement of the damper can be suppressed from being hindered by the stop portion.

[0013] In the acoustic device of the fifth aspect, in the acoustic device of the fourth aspect, a yoke is provided around the voice coil; and the distance by which the voice coil moves to the position at which the diaphragm abuts against the stop portion is set to be smaller than a distance by which the voice coil moves to a position at which the voice coil abuts against the yoke.

[0014] In the acoustic device of the fifth aspect, the distance by which the voice coil moves to the position at which the diaphragm abuts against the stop portion is set to be smaller than the distance by which the voice coil moves to the position at which the voice coil abuts against the yoke. Thus, the voice coil can be suppressed from abutting against the yoke before the diaphragm abuts against the stop portion.

[0015] In the acoustic device of the sixth aspect, in any one of the acoustic devices of the first to fifth aspects, the stop portion is formed integrally with the frame.

[0016] In the sixth type of audio device, compared with the structure formed by separating the stop and the frame, the increase in the number of parts of the audio device can be suppressed.

[0017] The seventh type of audio device is an audio device in which the surface of the vibrating plate side of the stop portion is curved, in any one of the first to sixth types of audio devices.

[0018] In the audio device of the seventh type, compared with the structure in which the surface of the diaphragm side of the stop portion is not bent, the contact pressure between the stop portion and the joint portion can be reduced.

[0019] The eighth type of audio device is an audio device in any one of the first to seventh types, in which the outer periphery of the diaphragm abuts against the stop portion when the diaphragm is pressed toward the frame side.

[0020] In the audio device of the eighth method, when the diaphragm is pressed toward the frame side, the outer periphery of the diaphragm abuts against the stop portion, thereby suppressing the outer periphery of the diaphragm from undergoing reverse deformation relative to the inner periphery.

[0021] The ninth type of audio device is an audio device in any one of the first to eighth types, in which a plurality of stop parts are arranged in a parallel manner in the radial direction of the diaphragm; when the diaphragm is pressed toward the frame side, the diaphragm abuts against the plurality of stop parts.

[0022] In the audio device of the ninth type, multiple stop portions are arranged side by side in the radial direction of the diaphragm, and when the diaphragm is pressed towards the frame side, the diaphragm abuts against the multiple stop portions. In this structure, compared with a structure that provides a single stop portion, it is possible to suppress the increase of contact pressure between the diaphragm and the stop portions. Invention Effects

[0023] The audio device disclosed herein has an excellent effect in suppressing the deformation of the diaphragm. Attached Figure Description

[0024] Figure 1 It is a sectional perspective view of an audio device cut along the front-to-back direction. Figure 2 It is a side sectional view of the audio device cut along the front-to-back direction. Figure 3 It is an enlarged side sectional view of the audio device cut along the front-to-back direction. Figure 4 These represent other examples of edge members, and... Figure 3 The corresponding sectional view. Figure 5 These are other examples of stops, and... Figure 3 The corresponding sectional view. Detailed Implementation

[0025] The following describes an acoustic device 10 according to an embodiment of the present disclosure. Figures 1 to 3 The acoustic device 10 according to the present embodiment is mounted on a vehicle, for example, and can be used as an external sound system (ESS), an acoustic vehicle alerting system (AVAS) siren, or the like. The front side and the rear side of the acoustic device 10 are indicated by arrows FR and RR, respectively. Hereinafter, when only the front-rear direction is indicated, the front-rear direction of the acoustic device 10 is meant unless otherwise specified.

[0026] As shown in Figs. 1 and 2, the acoustic device 10 includes a box-shaped main partition wall 12, a front cover 14 mounted to the front portion of the main partition wall 12, and an acoustic device main body 16 supported by the main partition wall 12 in a state of being arranged inside the main partition wall 12. In addition, the acoustic device 10 includes a vibration plate 28 arranged in front of the acoustic device main body 16. Figure 1 Figure 2 As shown in Figs. 1 and 2, the acoustic device 10 includes a box-shaped main partition wall 12, a front cover 14 mounted to the front portion of the main partition wall 12, and an acoustic device main body 16 supported by the main partition wall 12 in a state of being arranged inside the main partition wall 12. In addition, the acoustic device 10 includes a vibration plate 28 arranged in front of the acoustic device main body 16. Figure 1 Figure 2 In the drawings, the cross-sectional lines are omitted for the sake of observation.

[0027] The main partition wall 12 has a bottomed cylindrical shape with an open portion at the front end. Specifically, the main partition wall 12 includes a disc-shaped rear wall portion 12A having a thickness direction in the front-rear direction, and a cylindrical portion 12B extending toward the front side from the radially outer end of the rear wall portion 12A and having a cylindrical shape with an axis in the front-rear direction.

[0028] The front cover 14 has a bottomed cylindrical shape with an open portion at the rear end. Specifically, the front cover 14 includes a front wall portion 14A arranged in front of the vibration plate 28 to be described later, and a cylindrical portion 14B extending toward the rear side from the outer peripheral end of the front wall portion 14A and having a cylindrical shape with an axis in the front-rear direction. The rear end portion of the cylindrical portion 14B is joined to the front end portion of the cylindrical portion 12B of the main partition wall 12. Thus, a space in which the acoustic device main body 16 is arranged is formed between the main partition wall 12 and the front cover 14. In addition, the joint between the rear end portion of the cylindrical portion 14B and the front end portion of the cylindrical portion 12B of the main partition wall 12 is sealed by a sealant such as an adhesive, and the liquid tightness of the joint is ensured.

[0029] Further, the central portion of the front wall portion 14A is a convex portion 14C protruding toward the vibration plate 28. The rear side surface of the convex portion 14C is arranged along the front side surface of the vibration plate 28. In addition, a plurality of through holes 14D in the shape of long holes are formed in the front wall portion 14A at positions corresponding to the convex portion 14C. Further, a plurality of drain holes 14E are formed in the front wall portion 14A around the convex portion 14C.

[0030] ​​In addition, a second front cover 18 is attached to the central portion of the front wall portion 14A of the front cover 14 from the front side. This second front cover 18 covers the portion of the front wall portion 14A that covers the vibration plate 28 and the edge member 30, which will be described later, from the front side. That is, the vibration plate 28 and the edge member 30, which will be described later, are protected from the front side by the front wall portion 14A of the front cover 14 and the second front cover 18. In addition, the second front cover 18 is formed with a plurality of second through holes 18A and a plurality of second drain holes 18B.

[0031] As shown in Figs. 1 and 2, the acoustic device main body 16 is provided with a frame 20, a magnetic circuit portion 22 supported by the frame 20, a voice coil 24 disposed within the frame 20, a damper 26 provided between the voice coil 24 and the frame 20, a vibration plate 28 fixed to the voice coil 24, and an edge member 30 connecting the vibration plate 28 and the frame 20. Figure 2 Figure 3 As shown in Figs. 1 and 2, the acoustic device main body 16 is provided with a frame 20, a magnetic circuit portion 22 supported by the frame 20, a voice coil 24 disposed within the frame 20, a damper 26 provided between the voice coil 24 and the frame 20, a vibration plate 28 fixed to the voice coil 24, and an edge member 30 connecting the vibration plate 28 and the frame 20.

[0032] The frame 20 has a substantially stepped cylindrical shape, and has an opening shape in which the front side is larger than the rear side. The opening portion of the front side of the frame 20 is closed by the vibration plate 28 and the edge member 30, which will be described later.

[0033] The magnetic circuit portion 22 applies a magnetic field to the voice coil 24, which will be described later. The magnetic circuit portion 22 is provided with a yoke 32 having a bottomed cylindrical shape, a disc-shaped magnet 34 fixed to the bottom surface of the yoke 32, and a disc-shaped top plate 36 stacked on the magnet. The yoke 32 and the top plate 36 are formed of a soft magnetic material. The yoke 32 is disposed so as to open toward the front side and close the opening portion of the rear side of the frame 20. A gap is formed between the magnet 34, the top plate 36, and the yoke 32, and a portion of the voice coil 24, which will be described later, is disposed in the gap.

[0034] The voice coil 24 is configured to include a bobbin 38 having a cylindrical shape, and a coil 40 formed along the bobbin 38. The front end portion of the bobbin 38 is fixed with the vibration plate 28, which will be described later. The coil 40 is formed by winding a wire formed of an electrically conductive material along the bobbin 38, and a pair of end portions of the wire configuring the coil 40 are connected to a pair of terminals, not shown.

[0035] The damper 26 has a disc shape in which the central portion is formed with an opening, and has a wave shape in which the central portion is repeatedly bent in the front-rear direction in the radial direction. The opening of the central portion of the damper 26 is inserted with the voice coil 24. The inner peripheral portion of the damper 26 is engaged with the bobbin 38 of the voice coil 24, and the outer peripheral portion of the damper 26 is engaged with the frame 20. Thus, the bobbin 38 and the frame 20 are connected by the damper 26.

[0036] ​The diaphragm 28 is circular in view from the front-rear direction, and the front side is a concave open shape. The diaphragm 28 has an outer peripheral portion 28A that constitutes a radially outer portion thereof and is formed in a ring shape, and an inner peripheral portion 28B that constitutes a radially central portion thereof and is formed integrally with the outer peripheral portion 28A. The outer peripheral portion 28A is funnel-shaped that narrows gradually from the front side to the rear side. In addition, the inner peripheral portion 28B is shaped that is convex toward the rear side and concave toward the front side. In addition, the arrow R indicates a radially outer side of the diaphragm 28, and the arrow C indicates a circumferential direction of the diaphragm 28. Furthermore, the radial direction of the diaphragm 28 (the direction of the arrow R and the direction opposite to the arrow R) and the circumferential direction of the diaphragm 28 (the direction of the arrow C and the direction opposite to the arrow C) are directions orthogonal to the front-rear direction. Hereinafter, when only the radial direction is indicated, unless otherwise specified, it refers to the radial direction of the diaphragm 28; when only the circumferential direction is indicated, unless otherwise specified, it refers to the circumferential direction of the diaphragm 28.

[0037] The edge member 30 is formed of an elastic material such as rubber, and is ring-shaped in view from the front-rear direction. The radially outer end portion of the edge member 30 is joined to the front end portion of the frame 20. In addition, the radially inner end portion of the edge member 30 is joined to the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 in a state that the radially inner end portion of the edge member 30 and the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 overlap in the front-rear direction.

[0038] Next, the structure of the main portion of the present embodiment will be described.

[0039] As shown in FIG. 1, the edge member 30 is formed of an elastic material such as rubber, and is ring-shaped in view from the front-rear direction. The radially outer end portion of the edge member 30 is joined to the front end portion of the frame 20. In addition, the radially inner end portion of the edge member 30 is joined to the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 in a state that the radially inner end portion of the edge member 30 and the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 overlap in the front-rear direction. Figure 3 As shown in FIG. 1, the edge member 30 is formed of an elastic material such as rubber, and is ring-shaped in view from the front-rear direction. The radially outer end portion of the edge member 30 is joined to the front end portion of the frame 20. In addition, the radially inner end portion of the edge member 30 is joined to the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 in a state that the radially inner end portion of the edge member 30 and the radially outer end portion of the outer peripheral portion 28A of the diaphragm 28 overlap in the front-rear direction.

[0040] The radially intermediate portion of the frame 20 is provided with a stopper portion 20A that protrudes toward the front side. The stopper portion 20A is substantially cylindrical with the front-rear direction as an axis direction. In addition, the face 20B (the face of the front side) of the front side of the protruding direction of the stopper portion 20A is gently curved in a convex shape toward the front side in a cross-sectional view taken along the radial direction. The face 20B of the front side of the protruding direction of the stopper portion 20A is opposite to the joint portion 42 of the edge member 30 and the outer peripheral portion 28A of the diaphragm 28 in the front-rear direction. In addition, the stopper portion 20A can be formed continuously in the circumferential direction, or can be interrupted in a part of the circumferential direction. In addition, the stopper portion 20A can be formed dispersedly in the circumferential direction. In addition, as shown in FIG. 1, the stopper portion 20A is formed continuously in the circumferential direction.Figure 2 As shown, the stop portion 20A of this embodiment has a plurality of openings 20C extending radially through it, thus allowing the wiring 44 connected to the voice coil 24 to be routed through these openings 20C. Furthermore, Figure 3 The diagram of the opening 20C is omitted.

[0041] like Figure 3 As shown, a forward-convex buffer limiting part 20D is formed at the rear opening of the frame 20. The buffer 26 abuts against this buffer limiting part 20D, thus limiting the displacement of the buffer 26. Figure 3 The state shown is the state where the voice coil 24 is not energized. The position of the voice coil 24 in this state is called the neutral position. Furthermore, in this embodiment, the distance that the voice coil 24 moves to the position where the buffer 26 and the buffer limiting part 20D abut (the movement distance from the neutral position to the rearward side) is set to be greater than or equal to the distance that the voice coil 24 moves to the position where the junction 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 abuts and the stop part 20A (the movement distance from the neutral position to the rearward side).

[0042] In addition, in this embodiment, the distance from which the voice coil 24 moves to the position where the junction 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 abuts against the stop portion 20A (the distance of movement from the neutral position to the rearward side) is set to be less than the distance from which the voice coil 24 moves to the position where the bottom 32A of the yoke 32 abuts against the voice coil 24 (the distance of movement from the neutral position to the rearward side).

[0043] (The function and effects of this implementation method) Next, the function and effects of this implementation method will be explained.

[0044] like Figures 1 to 3 As shown, in the audio device 10 of this embodiment, the coil 40 of the voice coil 24 is energized through wiring paths (not shown) and external connectors (not shown). As a result, the diaphragm 28 vibrates and produces sound as the voice coil 24 moves in the front-to-back direction.

[0045] Furthermore, in the audio device 10 of this embodiment, when the diaphragm 28 is pressed towards the frame 20 due to water intrusion from the front side of the audio device 10, the joint 42 between the edge member 30 and the outer peripheral portion 28A of the diaphragm 28 comes into line contact with the stop portion 20A. As a result, the outer peripheral portion 28A of the diaphragm 28 is supported by the stop portion 20A, which can suppress the outer peripheral portion 28A of the diaphragm 28 from undergoing reverse deformation relative to the inner peripheral portion 28B.

[0046] Furthermore, in the audio device 10 of this embodiment, the distance at which the voice coil 24 moves to the position where the buffer 26 abuts against the buffer limiting portion 20D (the distance of movement from the neutral position to the rearward side) is set to be greater than or equal to the distance at which the voice coil 24 moves to the position where the junction 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 abuts against the stop portion 20A (the distance of movement from the neutral position to the rearward side). This prevents the movement (displacement) of the buffer 26 from being hindered by the stop portion 20A.

[0047] Furthermore, in the audio device 10 of this embodiment, the distance at which the voice coil 24 moves to the position where the joint 42 of the edge member 30 and the outer periphery 28A of the resonator 28 abuts against the stop portion 20A (the distance of movement from the neutral position to the rearward side) is set to be less than the distance at which the voice coil 24 moves to the position where it abuts against the bottom 32A of the yoke 32 (the distance of movement from the neutral position to the rearward side). Therefore, it is possible to prevent the voice coil 24 from abutting against the bottom 32A of the yoke 32 before the joint 42 of the edge member 30 and the outer periphery 28A of the resonator 28 abuts against the stop portion 20A.

[0048] Furthermore, in the audio device 10 of this embodiment, the stop portion 20A is integrally formed with the frame 20. As a result, compared with a structure in which the stop portion 20A and the frame 20 are formed separately, the increase in the number of parts of the audio device 10 can be suppressed.

[0049] Furthermore, in the audio device 10 of this embodiment, the front surface 20B of the stop portion 20A in the protruding direction is gently curved. Compared with a structure in which the front surface 20B of the stop portion 20A in the protruding direction is not curved, this structure can reduce the contact pressure between the stop portion 20A and the joint portion 42 of the edge member 30 and the outer periphery 28A of the vibrating plate 28.

[0050] Furthermore, the example described above illustrates an example of bending the surface 20B on the protruding front end side of the stop portion 20A, but this disclosure is not limited thereto. Whether the surface 20B on the protruding front end side of the stop portion 20A is bent can be appropriately set according to the estimated contact pressure between the stop portion 20A and the joint portion 42.

[0051] Furthermore, the examples described above illustrate an example where the stop portion 20A is integrally formed with the frame 20, but this disclosure is not limited thereto. Whether the stop portion 20A is integrally formed with the frame 20 can be appropriately determined based on the structure and manufacturing method of the frame 20.

[0052] Furthermore, in the example described above, the distance (the distance of movement from the neutral position to the rearward side) from which the voice coil 24 moves to the position where it abuts the joint 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 and the stop 20A is set to be less than the distance (the distance of movement from the neutral position to the rearward side) from which the voice coil 24 moves to the position where it abuts the bottom 32A of the yoke 32. However, this disclosure is not limited to this. For example, if there is no problem with the voice coil 24 abutting the bottom 32A of the yoke 32 even before the joint 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 abuts the stop 20A, then each distance can be set outside the above range.

[0053] Furthermore, in the example described above, the distance at which the voice coil 24 moves to the position where it abuts against the buffer 26 and the buffer limiting part 20D (the distance of movement from the neutral position to the rearward side) is set to be greater than or equal to the distance at which the voice coil 24 moves to the position where it abuts against the joint 42 of the edge member 30 and the outer periphery 28A of the diaphragm 28 and the stop part 20A (the distance of movement from the neutral position to the rearward side). However, this disclosure is not limited to this. For example, if it is expected that the movement (displacement) of the buffer 26 will not be hindered by the stop part 20A, then each distance can be set outside the above-described range.

[0054] Furthermore, in the examples described above, the thickness of the portion of the edge member 30 that engages with the outer periphery 28A of the vibrating plate 28 (radially inner end 30A) is the same as the thickness of the portion 30B of the edge member 30 that deforms with the vibration of the vibrating plate 28, but this disclosure is not limited thereto. For example, as Figure 4 As shown, a structure can be adopted in which the thickness of the portion of the edge member 30 that engages with the outer periphery 28A of the vibrating plate 28 (radially inner end 30A) is greater than the thickness of the portion 30B of the edge member 30 that deforms with the vibration of the vibrating plate 28. In this structure, relative to... Figure 3 The structure shown can effectively strengthen the radially outer end 28A1 of the outer periphery 28A of the vibrating plate 28 through the edge member 30. That is, it can effectively strengthen the joint 42 that abuts against the stop portion 20A.

[0055] Furthermore, the example described above illustrates an example where the stop 20A is located at a radial position, but this disclosure is not limited thereto. For example, as Figure 5 As shown, a structure in which multiple stop portions 20A are provided at multiple positions in the radial direction can be adopted. Figure 5 In the example shown, multiple stop portions 20A are arranged radially side-by-side at positions opposite to the outer periphery of the vibrating plate 28. This structure, compared to a structure with a single stop portion 20A (where the stop portion 20A is located at a single radial position), can suppress the increase in contact pressure between the vibrating plate 28 and the stop portion 20A. Furthermore,Figure 5 In the example shown, the stop forming member 46 is engaged with the frame 20, and a portion of the plurality of stops 20A are formed on the stop forming member 46.

[0056] Furthermore, in this embodiment, a structure in which the vibrating plate 28 and the edge member 30 are separate components has been described, but this disclosure is not limited thereto. For example, a structure in which the vibrating plate 28 and the edge member 30 are integrally formed (a structure in which the joint 42 is not formed) can be used.

[0057] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above content. It is self-evident that various modifications can be made in addition to the above without departing from its spirit.

[0058] The disclosure of Japanese Patent Application No. 2023-140568, filed on August 30, 2023, is incorporated herein by reference in its entirety.

Claims

1. An audio device comprising: A vibrating plate that produces sound through vibration; A frame that supports the vibrating plate; A stop portion is provided between the vibrating plate and the frame. When the vibrating plate is pressed towards the frame, a portion of the vibrating plate abuts against and inhibits deformation of the vibrating plate. When the vibrating plate is pressed towards the frame side, the vibrating plate comes into line contact with the stop portion.

2. The audio device according to claim 1, The outer periphery of the vibrating plate is connected to the frame via an edge member, and a portion of the edge member deforms as the vibrating plate vibrates. A portion of the edge member is joined to the outer periphery of the vibrating plate in an overlapping manner to form a joint. When the vibrating plate is pressed toward the frame side, the joint abuts against the stop.

3. The audio device according to claim 2, The thickness of the portion of the edge member that engages with the outer periphery of the vibrating plate is greater than the thickness of the portion of the edge member that deforms with the vibration of the vibrating plate.

4. The audio device according to any one of claims 1 to 3, A voice coil is fixed to the inner circumference of the vibrating plate, and the voice coil is connected to the frame through a buffer. The frame is provided with a buffer limiting part that restricts the displacement of the buffer towards the frame side; The distance from which the voice coil moves to the position where the buffer abuts against the buffer limiting part is set to be greater than or equal to the distance from which the voice coil moves to the position where the diaphragm abuts against the stop part.

5. The audio device according to claim 4, A yoke is provided around the voice coil; The distance at which the voice coil moves to the position where the vibrating plate abuts against the stop is set to be less than the distance at which the voice coil moves to the position where the voice coil abuts against the yoke.

6. The audio device according to claim 1, The stop portion is integrally formed with the frame.

7. The audio device according to claim 1, The surface of the vibrating plate in the stop portion is curved.

8. The audio device according to claim 1, When the vibrating plate is pressed toward the frame side, the outer periphery of the vibrating plate abuts against the stop portion.

9. The audio device according to claim 1, The plurality of the stops are arranged side by side in the radial direction of the vibrating plate; When the vibrating plate is pressed toward the frame side, the vibrating plate abuts against the plurality of stops.

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