Sound production device and vehicle armrest box system

Abstract

A sound production device and a vehicle armrest box system. The sound production device comprises a frame (1), a first sound production unit (2), a second sound production unit (3) and a single magnetic conduction bowl (4), wherein the first sound production unit (2) comprises a first cone (21), a first voice coil (22), a first top plate (23) and first magnet (24); the second sound production unit (3) comprises a second cone (31), a second voice coil (32), a second top plate (33) and second magnet (34); the single magnetic conduction bowl (4) is provided with a first accommodating cavity (401) and a second accommodating cavity (402) which are arranged in a direction of the vibration axis; the first sound production unit (2) and the second sound production unit (3) are respectively located on opposite sides of the magnetic conduction bowl (4), the first top plate (23) and the first magnet (24) are arranged in the first accommodating cavity (401) and form a first magnetic gap (403) for allowing the other end of the first voice coil (22) to be inserted, and the second top plate (33) and the second magnet (34) are arranged in the second accommodating cavity (402) and form a second magnetic gap (404) for allowing the other end of the second voice coil (32) to be inserted. The sound production device can achieve the sound effect equivalent to two loudspeakers while reducing the size (height) in the direction of the vibration axis.

Description

Sounding device and vehicle armrest box system Related applications

[0001] This application claims priority to Chinese patent application No. CN2023116487562 filed on December 5, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention belongs to the field of vehicle-mounted speakers and relates to a sound-generating device and a vehicle armrest box system. Background Art

[0003] The in-car audio system is a crucial component of a vehicle's multimedia system. Currently, in-car audio system designs, two mid-range speakers are placed between the front driver and front passenger seats. One mid-range speaker faces the driver, while the other faces the front passenger. Each mid-range speaker is independently powered to radiate sound to the left and right. In terms of lateral space, stacking two separate mid-range speakers results in a larger overall size and requires more lateral space, sacrificing some space between the driver and front passenger seats and impacting the sense of space in the front row. This approach poses challenges to front-row space layout, hinders cost control, and is more complex to install. While some designs eliminate the two mid-range speakers in the center front row, thereby preserving the required space between the driver and front passenger seats, the overall sound quality of the in-car audio system deteriorates, resulting in a loss of user experience. Summary of the Invention

[0004] The present disclosure relates to a sound-generating device that can achieve sound effects equivalent to those of two speakers while reducing the size (height) in the direction of the vibration axis, saving space and cost, and is suitable for use in an in-vehicle audio system of a vehicle.

[0005] The present disclosure also relates to a vehicle armrest box system using the sound-generating device, which has a reduced lateral size, thereby reducing the impact on the seating space on both sides, while achieving a sound effect equivalent to that of two speakers.

[0006] One aspect of the present disclosure provides a sound-generating device, comprising a bracket and a first sound-generating unit and a second sound-generating unit disposed on the bracket, wherein the first sound-generating unit and the second sound-generating unit are arranged along a vibration axis of the sound-generating device;

[0007] The first sound unit includes a first cone, a first voice coil, a first front piece and a first magnet, and one end of the first voice coil is connected to the first cone;

[0008] The second sound unit includes a second cone, a second voice coil, a second front piece and a second magnet, and one end of the second voice coil is connected to the second cone;

[0009] The sound-generating device further includes a single magnetic bowl disposed in the bracket, the single magnetic bowl having a first cavity and a second cavity, the first cavity and the second cavity being arranged along the vibration axis;

[0010] The first sound unit and the second sound unit are respectively located on opposite sides of the magnetic bowl, the first front piece and the first magnet are arranged in the first cavity and form a first magnetic gap for the other end of the first voice coil to be inserted, and the second front piece and the second magnet are arranged in the second cavity and form a second magnetic gap for the other end of the second voice coil to be inserted.

[0011] In some embodiments, the single magnetic conductive bowl includes an annular magnetic conductive member and a partition plate, and the partition plate is arranged in the middle of the annular magnetic conductive member to separate the space enclosed by the annular magnetic conductive member into the first cavity and the second cavity.

[0012] In some embodiments, the annular magnetic conductive member is hollow and cylindrical with both ends open, the first cavity and the second cavity each have an open end, and the first cavity and the second cavity are independent of each other or interconnected.

[0013] In some embodiments, a plurality of slots are formed on the annular magnetic conductive member, and the partition plate has a plurality of outwardly protruding convex portions, and the convex portions are engaged in the slots.

[0014] In some embodiments, the slot extends from one end of the annular magnetic conductive component along the vibration axis to the middle of the annular magnetic conductive component; the shape of the outer protrusion is configured to only allow the outer protrusion to enter and exit the slot along the vibration axis.

[0015] In some embodiments, the partition plate is in the shape of a flat plate perpendicular to the vibration axis.

[0016] In some embodiments, the annular magnetic conductive component is further provided with a wire notch or a through hole for the lead wires of the first voice coil and / or the second voice coil to pass through.

[0017] In some embodiments, a threading notch is provided on the first long side of the annular magnetic conductive component for the lead wire of the first voice coil to pass through, and a threading notch is provided on the second long side of the annular magnetic conductive component for the lead wire of the second voice coil to pass through. One of the two threading notches extends downward from the upper edge of the annular magnetic conductive component, and the other extends upward from the lower edge of the annular magnetic conductive component.

[0018] In some embodiments, the first magnetic steel and the second magnetic steel are respectively stacked on two opposite surfaces of the partition plate, the first front plate is stacked on the first magnetic steel, and the second front plate is stacked on the second magnetic steel; the first magnetic gap is formed between the outer surface of the first front plate and the first magnetic steel and the inner surface of the annular magnetic conductive component, and the second magnetic gap is formed between the outer surface of the second front plate and the second magnetic steel and the inner surface of the annular magnetic conductive component.

[0019] In some embodiments, the single magnetic bowl is fixed on the inner wall of the bracket; a positioning surface for fixing the magnetic bowl is also provided in the bracket.

[0020] In some embodiments, the bracket includes a first bracket and a second bracket, the magnetic bowl is located between the first bracket and the second bracket, the first bracket and the second bracket respectively have an annular sound cone connecting part, and the magnetic bowl is located between the two sound cone connecting parts.

[0021] A second aspect of the present disclosure provides a vehicle armrest box system, comprising an armrest box for being arranged between two seats of a vehicle, the vehicle armrest box system further comprising the aforementioned sound-generating device, the sound-generating device being installed in the armrest box to radiate sound to the two seats respectively.

[0022] In some embodiments, the armrest box is installed between the driver's seat and the passenger seat.

[0023] The disclosed sound-generating device and vehicle armrest system arrange two sound-generating units along the same vibration axis and share a common magnetic bowl. Compared to installing two separate mid-range speakers between two seats, this significantly reduces the size (height) along the vibration axis, saving space and cost, and minimizing the impact on the seating space on either side. This makes it suitable for use in vehicle audio systems, facilitating interior space layout while also achieving the same sound quality as two speakers. Furthermore, the sound-generating device is relatively easy and convenient to install in a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is an exploded view of a sound-generating device according to an embodiment of the present disclosure.

[0026] FIG2 is an exploded view of a magnetic bowl according to an embodiment of the present disclosure.

[0027] FIG3 is a structural diagram of a first basin stand according to an embodiment of the present disclosure.

[0028] FIG4 is a front view of a sound-generating device according to an embodiment of the present disclosure.

[0029] FIG5 is a top view of a sound-generating device according to an embodiment of the present disclosure.

[0030] FIG6 is a cross-sectional view of a sound-generating device along its vibration axis according to an embodiment of the present disclosure.

[0031] FIG7 is a BL curve diagram of a sound-generating device according to an embodiment of the present disclosure.

[0032] FIG8 is a Kms curve diagram of a sound-generating device according to an embodiment of the present disclosure.

[0033] in,

[0034] 1 - bracket; 11 - first bracket; 12 - second bracket; 101 - cone fixing part; 102 - positioning surface;

[0035] 2 - First sound unit; 21 - First cone; 22 - First voice coil; 23 - First front plate; 24 - First magnet;

[0036] 3 - Second sound unit; 31 - Second cone; 32 - Second voice coil; 33 - Second front piece; 34 - Second magnet;

[0037] 4 - magnetic bowl; 41 - annular magnetic member; 411 - slot; 42 - partition plate; 421 - outer protrusion; 401 - first cavity; 402 - second cavity; 403 - first magnetic gap; 404 - second magnetic gap;

[0038] 5 - Pad with cotton. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings to make the advantages and features of the present disclosure more easily understood by those skilled in the art. It should be noted that the descriptions of these embodiments are intended to facilitate understanding of the present disclosure and do not constitute a limitation of the present disclosure. In addition, the technical features involved in the various embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0040] In this disclosure, the terms "inside" and "outside" are defined relative to the centerline of the voice coil, with the direction closer to the centerline being considered inside, and the direction farther away from the centerline being considered outside. The directional terms "upper," "lower," and "horizontal" are intended to facilitate understanding of the structure of a sound-producing device by those skilled in the art and are not intended to define the state of the speaker after installation in its intended use. For example, the sound-producing device can be mounted on a horizontal, inclined, or vertical surface within a vehicle.

[0041] This embodiment provides a sound-generating device that can be used as a midrange unit in a speaker system or an in-vehicle audio system, emitting mid-frequency sounds. This embodiment also provides a vehicle armrest system, which utilizes this sound-generating device and can be installed between two seats in a vehicle, typically between the driver's seat and the front passenger seat, to radiate mid-frequency sounds to both sides. This device, along with tweeters, woofers, and other components, constitutes the vehicle's in-vehicle audio system. The sound-generating device is installed in the armrest, which is installed between the two seats.

[0042] As shown in Figures 1 to 6, the sound-emitting device includes a bracket 1 and a first sound-emitting unit 2 and a second sound-emitting unit 3 disposed on the bracket 1. The first sound-emitting unit 2 and the second sound-emitting unit 3 are arranged along the vibration axis of the sound-emitting device. The first sound-emitting unit 2 includes a first cone 21, a first voice coil 22, a first front plate 23, and a first magnet 24. One end of the first voice coil 22 is connected to the first cone 21. The second sound-emitting unit 3 includes a second cone 31, a second voice coil 32, a second front plate 33, and a second magnet 34. One end of the second voice coil 32 is connected to the second cone 31.

[0043] Herein, the "vibration axis" refers to the desired vibration direction of the first and second cones 21, 31, which is ideally the centerline of the first and second voice coils 22, 32. In this embodiment, the centerline of the first and second voice coils 22, 32 coincide with each other and extend in the vertical direction of the pages of Figures 1 and 6.

[0044] In this article, the directional terms "inside" and "outside" are also defined with reference to the movement axis. The side of the component closer to the movement axis is the inside, and the opposite side is the outside.

[0045] The various components of the sound-generating device are described in detail below.

[0046] The bracket 1 is used to support and protect other components of the sound-emitting device, especially flexible or relatively fragile internal components such as the first sound cone 21, the second sound cone 31, the first voice coil 22 and the second voice coil 32. For example, it is fixed to the armrest box through the bracket 1. As shown in Figure 3, the bracket 1 includes a first bracket 1 and a second bracket 1, and the first bracket 1 and the second bracket 1 are connected to each other; further, the first bracket 1 and the second bracket 1 can also be disassembled from each other. The bracket 1 consists of two parts, the first bracket 1 and the second bracket 1, which can facilitate the assembly of internal components. Among them, the first bracket 1 is provided with a screw hole for connecting to the armrest box by screws. The first bracket 1 and the second bracket 1 respectively have an annular sound cone connecting part 101. The first bracket 1 and / or the second bracket 1 may also have a positioning surface 102, whose function will be described below.

[0047] As shown in Figure 6, both the first and second cones 21 and 31 are flat cones with a flat body. The outer edge of the first cone 21 is fixed to the cone connection portion 101 (upper surface) of the second bracket 1; the outer edge of the second cone 31 is fixed to the cone connection portion 101 (lower surface) of the first bracket 1.

[0048] As shown in Figures 1 and 6 , the sound-generating device also includes a single magnetic bowl 4 disposed within the bracket 1. The bowl 4 has a first cavity 401 and a second cavity 402, arranged along the vibration axis. In this embodiment, the first cavity 401 and the second cavity 402 are independent of each other and not interconnected. In other embodiments, the first cavity 401 and the second cavity 402 are interconnected. The first sound-generating unit 2 and the second sound-generating unit 3 are located on opposite sides of the magnetic bowl 4. The first front plate 23 and the first magnet 24 are disposed within the first cavity 401, thereby forming a first magnetic gap 403 for insertion of the other end of the first voice coil 22. The other end (lower end) of the first voice coil 22 can be inserted into the first magnetic gap 403 so as to move up and down along the vibration axis. The second front piece 33 and the second magnet 34 are arranged in the second cavity 402, thereby forming a second magnetic gap 404 for the other end of the second voice coil 32 to be inserted. The other end (upper end) of the second voice coil 32 can be inserted into the second magnetic gap 404 so as to move up and down along the vibration axis.

[0049] Referring to Figure 2 , the single magnetic bowl 4 includes an annular magnetic member 41 and a partition 42. The partition 42 is positioned in the middle of the annular magnetic member 41 to separate the space enclosed by the annular magnetic member 41 into the aforementioned first cavity 401 and second cavity 402. The annular magnetic member 41 is hollow, cylindrical, and open at both ends, and has a certain height. The first cavity 401 and the second cavity 402 each have one open end. The partition 42 is a flat plate perpendicular to the vibration axis. In other words, the partition 42 divides the space within the annular magnetic member 41 into two, forming two grooves, namely the first cavity 401 and the second cavity 402. The shape of the annular magnetic member 41 should complement the shapes of the first and second cones 21 and 31. In this embodiment, if the first and second cones 21 and 31 are elliptical or racetrack-shaped, the annular magnetic member 41 should also be an elliptical or racetrack-shaped cylinder. In some other embodiments, the first and second cones 21 and 31 are circular in shape, and the annular magnetic conductive member 41 is also a circular cylinder, that is, a hollow cylinder.

[0050] The annular magnetic member 41 is provided with a plurality of slots 411, and the partition plate 42 has a plurality of outwardly protruding protrusions 421, which snap into the slots 411. The slots 411 extend from one end of the annular magnetic member 41 to the middle of the annular magnetic member 41 along the vibration axis. The protrusions 421 are shaped to only allow the protrusions 421 to enter and exit the slots 411 along the vibration axis, thereby preventing the partition plate 42 from shaking in a direction perpendicular to the vibration axis. The arrangement of the slots 411 and the protrusions 421 facilitates the assembly of the magnetic bowl 4 and the installation of other magnetic circuit components within the magnetic bowl 4, including the first magnetic steel 24, the first front plate 23, the second magnetic steel 34, and the second front plate 33. The outer surface of the partition plate 42 can be in close contact with the inner surface of the annular magnetic member 41, or a gap can be provided. If they are in close contact, the first and second cavities 401, 402 are independent and disconnected.

[0051] The annular magnetic member 41 also has a threading notch or through-hole for the leads of the first voice coil 22 and / or the second voice coil 32 to pass through, facilitating audio signal input. A threading notch for the leads of the first voice coil 22 is located on the first long side of the annular magnetic member 41, and a threading notch for the leads of the second voice coil 32 is located on the second long side of the annular magnetic member 41. One of the two threading notches extends downward from the upper edge of the annular magnetic member 41, and the other extends upward from the lower edge of the annular magnetic member 41.

[0052] A single magnetic bowl 4 is fixed to the inner wall of the bracket 1. Furthermore, the magnetic bowl 4 is located between the respective cone connecting parts 101 of the first bracket 1 and the second bracket 1. Specifically, the annular magnetic conductive member 41 is clamped between the cone connecting parts 101 of the first bracket 1 and the second bracket 1. After completing the assembly of the magnetic bowl 4 and the assembly of the magnetic bowl 4 and the other magnetic circuit components mentioned above, the first bracket 1 and the second bracket 1 are assembled with each other, which facilitates assembly and reduces assembly difficulty. A positioning surface 102 for fixing the magnetic bowl 4 is also provided in the bracket 1, and the partition plate 42 can be further positioned and restricted by the positioning surface 102.

[0053] Specifically, the first magnetic steel 24 and the second magnetic steel 34 are respectively laminated on opposite surfaces of the partition plate 42. As shown in FIG6 , the first magnetic steel 24 is laminated and glued on the upper surface of the partition plate 42, and the second magnetic steel 34 is laminated and glued on the lower surface of the partition plate 42. The first front plate 23 is laminated on the first magnetic steel 24, and the second front plate 33 is laminated on the second magnetic steel 34. A first magnetic gap 403 is formed between the outer surfaces of the first front plate 23 and the first magnetic steel 24 and the inner surface of the annular magnetic conductive member 41, and a second magnetic gap 404 is formed between the outer surfaces of the second front plate 33 and the second magnetic steel 34 and the inner surface of the annular magnetic conductive member 41.

[0054] As shown in Figure 6, in the vehicle armrest box system of this embodiment, the movement axis of the sound generating device is arranged horizontally and extends in the left-right direction of the vehicle. The first sound generating unit 2 is located on the passenger side, and the second sound generating unit 3 is located on the driver side.

[0055] In this embodiment, the first sound unit 2 and the second sound unit 3 have identical dimensions and structures, and their cones have identical shapes and areas. When installed on a vehicle, the first sound unit 2 and the second sound unit 3 are mirror-symmetrical about a vertical plane extending forward and backward.

[0056] The inventors evaluated the acoustic performance of the sound-generating device of this embodiment, and the resulting BL and Kms curves are shown in Figures 7 and 8, respectively. In the field of loudspeakers, BL and Kms curves describe parameters related to the performance of a loudspeaker motor system. BL stands for "magnetic force factor" (B represents magnetic flux density, and L represents coil length), while Kms represents "mechanical rigidity."

[0057] The BL curve describes the relationship between the driving force exerted on a loudspeaker coil in a magnetic field and its position. This parameter is a crucial motor parameter in loudspeaker design, directly impacting the speaker's efficiency and controllability. Ideally, the BL value should be constant, meaning the driving force remains constant regardless of the coil's position in the magnetic gap. However, in practice, due to the nonlinear nature of the magnetic gap, the BL value may vary with changes in coil position.

[0058] The Kms curve in a loudspeaker represents the variation in the mechanical stiffness of the suspension system (typically consisting of the diaphragm's edge suspension and center support) with driver displacement. Mechanical stiffness refers to the suspension system's resistance to driver displacement, similar to the stiffness of a spring. Ideally, this stiffness should be linear, meaning that the suspension system's reaction force to displacement is proportional to the displacement over the entire operating range. However, in practice, due to material and design limitations, the Kms curve often exhibits certain nonlinear characteristics.

[0059] A well-designed loudspeaker design strives to maintain a flat BL and Kms across the entire operating range, ensuring that the suspension system's stiffness (Kms) complements the force (BL) acting on the voice coil in the magnetic gap. This means that throughout the voice coil's operating range, Kms should also be high where BL is high. In this embodiment, as shown in Figures 7 and 8 , both Kms and BL are relatively high when the speaker is displaced downward; and relatively low when it is displaced downward. This symmetry complements the two. Furthermore, the Kms and BL curves in this embodiment are relatively flat, significantly reducing loudspeaker distortion.

[0060] The sound-generating device and vehicle armrest system of this embodiment arranges two sound-generating units along the same vibration axis and shares a common magnetic bowl 4. Compared to installing two separate mid-range speakers between two seats, this significantly reduces the size (height) along the vibration axis, saving space and cost, and minimizing the impact on the seating space on either side. This makes it suitable for use in vehicle audio systems, facilitating interior space layout while also achieving sound effects equivalent to two speakers. Furthermore, the sound-generating device is relatively convenient and simple to install in a vehicle.

[0061] Features of embodiments of the present disclosure are set forth in the following clauses:

[0062] 1. A sound-generating device, comprising a bracket and a first sound-generating unit and a second sound-generating unit disposed on the bracket, wherein the first sound-generating unit and the second sound-generating unit are arranged along a vibration axis of the sound-generating device;

[0063] The first sound unit includes a first cone, a first voice coil, a first front piece and a first magnet, and one end of the first voice coil is connected to the first cone;

[0064] The second sound unit includes a second cone, a second voice coil, a second front piece and a second magnet, and one end of the second voice coil is connected to the second cone;

[0065] The sound-generating device further includes a single magnetic bowl disposed in the bracket, the single magnetic bowl having a first cavity and a second cavity, the first cavity and the second cavity being arranged along the vibration axis;

[0066] In which, the first sound unit and the second sound unit are respectively located on opposite sides of the magnetic bowl, the first front piece and the first magnet are arranged in the first cavity and form a first magnetic gap for the other end of the first voice coil to be inserted, and the second front piece and the second magnet are arranged in the second cavity and form a second magnetic gap for the other end of the second voice coil to be inserted.

[0067] 2. The sound-generating device according to clause 1, wherein the single magnetic bowl comprises an annular magnetic conductive member and a partition plate, and the partition plate is arranged in the middle of the annular magnetic conductive member to separate the space enclosed by the annular magnetic conductive member into the first cavity and the second cavity.

[0068] 3. The sound-generating device according to clause 2, wherein the annular magnetic conductive member is hollow and cylindrical with both ends open, the first cavity and the second cavity each have one open end, and the first cavity and the second cavity are independent of each other or interconnected.

[0069] 4. The sound-generating device according to clause 2 or 3, wherein the annular magnetic conductive member is provided with a plurality of slots, the partition plate has a plurality of outwardly protruding convex portions, and the convex portions are engaged in the slots.

[0070] 5. The sound-generating device according to clause 4, wherein the slot extends from one end of the annular magnetic conductive member along the vibration axis to the middle of the annular magnetic conductive member; and the shape of the convex portion is configured to only allow the convex portion to enter and exit the slot along the vibration axis.

[0071] 6. The sound-generating device according to any one of clauses 2 to 5, wherein the partition plate is in the shape of a flat plate perpendicular to the vibration axis.

[0072] 7. The sound-generating device according to any one of clauses 2 to 6, wherein the annular magnetic conductive member is further provided with a threading notch or a through hole for the lead wires of the first voice coil and / or the second voice coil to pass through.

[0073] 8. A sound-producing device according to clause 7, wherein a threading notch is provided on the first long side of the annular magnetic conductive member for the lead wire of the first voice coil to pass through, and a threading notch is provided on the second long side of the annular magnetic conductive member for the lead wire of the second voice coil to pass through, one of the two threading notches extends downward from the upper edge of the annular magnetic conductive member, and the other extends upward from the lower edge of the annular magnetic conductive member.

[0074] 9. A sound-emitting device according to any one of clauses 2 to 8, wherein the first magnetic steel and the second magnetic steel are respectively stacked on two opposite surfaces of the partition plate, the first front piece is stacked on the first magnetic steel, and the second front piece is stacked on the second magnetic steel; the first magnetic gap is formed between the outer surface of the first front piece and the first magnetic steel and the inner surface of the annular magnetic conductive part, and the second magnetic gap is formed between the outer surface of the second front piece and the second magnetic steel and the inner surface of the annular magnetic conductive part.

[0075] 10. The sound-generating device according to any of the preceding clauses, wherein the single magnetic bowl is fixed on the inner wall of the bracket; and a positioning surface for fixing the magnetic bowl is also provided in the bracket.

[0076] 11. A sound-producing device according to any of the preceding clauses, wherein the bracket includes a first bracket and a second bracket, the magnetic bowl is located between the first bracket and the second bracket, the first bracket and the second bracket respectively have an annular sound cone connecting portion, and the magnetic bowl is located between the two sound cone connecting portions.

[0077] As shown in this specification and claims, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

[0078] Those skilled in the art will understand that, unless otherwise stated, the singular forms "a", "the" and "the" used herein may also include plural forms. It is further understood that "a plurality" in this disclosure refers to two or more, and other quantifiers are similar thereto.

[0079] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0080] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0081] The above embodiment is only for illustrating the technical concept and features of the present disclosure and is a preferred embodiment. Its purpose is to enable people familiar with this technology to understand the content of the present disclosure and implement it accordingly, and it cannot be used to limit the scope of protection of the present disclosure.

Claims

1. A sound generating device, comprising a bracket and a first sound generating unit and a second sound generating unit disposed on the bracket, wherein the first sound generating unit and the second sound generating unit are arranged along the vibration axis of the sound generating device; The first sound generating unit includes a first diaphragm, a first voice coil, a first front plate and a first magnet, and one end of the first voice coil is connected to the first diaphragm; The second sound generating unit includes a second diaphragm, a second voice coil, a second front plate and a second magnet, and one end of the second voice coil is connected to the second diaphragm; The sound generating device further includes a single magnetic conductive bowl disposed in the bracket, the single magnetic conductive bowl having a first cavity and a second cavity, and the first cavity and the second cavity are arranged along the vibration axis direction; Wherein, The first sound generating unit and the second sound generating unit are respectively located on opposite sides of the magnetic conductive bowl, the first front plate and the first magnet are disposed in the first cavity and form a first magnetic gap for the other end of the first voice coil to be inserted, and the second front plate and the second magnet are disposed in the second cavity and form a second magnetic gap for the other end of the second voice coil to be inserted.

2. The sound generating device according to claim 1, Characterized in that, The single magnetic conductive bowl includes an annular magnetic conductive member and a partition plate, and the partition plate is disposed in the middle of the annular magnetic conductive member to divide the space enclosed by the annular magnetic conductive member into the first cavity and the second cavity.

3. The sound generating device according to claim 2, Characterized in that, The annular magnetic conductive member is a hollow cylindrical body with both ends open, the first cavity and the second cavity respectively have an open end, and the first cavity and the second cavity are independent of each other or communicate with each other.

4. The sound generating device according to claim 2 or 3, Characterized in that, A plurality of card slots are formed on the annular magnetic conductive member, and the partition plate has a plurality of outwardly protruding convex portions, and the convex portions are clamped in the card slots.

5. The sound generating device according to claim 4, Characterized in that, The card slots extend from one end of the annular magnetic conductive member along the vibration axis to the middle of the annular magnetic conductive member; the shape of the convex portion is configured to only allow the convex portion to enter and exit the card slot along the vibration axis.

6. The sound generating device according to any one of claims 2 to 5, Characterized in that, The partition plate is a flat plate perpendicular to the vibration axis.

7. The sound generating device according to any one of claims 2 to 6, Characterized in that, The annular magnetic conductive member is further provided with a wire passing notch or through hole for the lead of the first voice coil and / or the second voice coil to pass through.

8. The sound generating device according to claim 7, Characterized in that, A wire passing notch for the lead of the first voice coil to pass through is provided on the first long side of the annular magnetic conductive member, a wire passing notch for the lead of the second voice coil to pass through is provided on the second long side of the annular magnetic conductive member, and one of the two wire passing notches extends downward from the upper edge of the annular magnetic conductive member, and the other extends upward from the lower edge of the annular magnetic conductive member.

9. The sound generating device according to any one of claims 2 to 8, Characterized in that, The first magnetic steel and the second magnetic steel are respectively laminated on two opposite surfaces of the partition plate, the first front piece is laminated on the first magnetic steel, and the second front piece is laminated on the second magnetic steel; the first magnetic gap is formed between the outer surfaces of the first front piece and the first magnetic steel and the inner surface of the annular magnetic conductive member, and the second magnetic gap is formed between the outer surfaces of the second front piece and the second magnetic steel and the inner surface of the annular magnetic conductive member.

10. The sound generating device according to any one of the preceding claims, characterized in that, the single magnetic conductive bowl is fixed on the inner wall of the bracket; a positioning surface for fixing the magnetic conductive bowl is further provided in the bracket.

11. The sound generating device according to any one of the preceding claims, characterized in that, the bracket includes a first bracket and a second bracket, the magnetic conductive bowl is located between the first bracket and the second bracket, the first bracket and the second bracket respectively have annular speaker connection parts, and the magnetic conductive bowl is located between the two speaker connection parts.

12. A vehicle armrest box system, comprising an armrest box for being arranged between two seats of a vehicle and the sound generating device according to any one of the preceding claims, wherein the sound generating device is installed in the armrest box to radiate sound to the two seats respectively.

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