A diaphragm assembly and a loudspeaker

Abstract

The application provides a diaphragm assembly and a loudspeaker. The loudspeaker comprises oppositely arranged upper and lower cover plates, a magnetic circuit system, a diaphragm assembly, and a circuit board. The upper and lower cover plates form a receiving space therebetween. The magnetic circuit system is received in the receiving space and comprises an inner magnetic circuit and an outer magnetic circuit surrounding the outer periphery of the inner magnetic circuit. The diaphragm assembly is received in the receiving space and arranged between the inner magnetic circuit and the outer magnetic circuit. The diaphragm assembly comprises a plurality of planar diaphragms arranged in a stacked and spaced manner. Cavities are formed between adjacent two layers of planar diaphragms. The cavities are provided with air holes in communication with the outside. Each planar diaphragm comprises a diaphragm and a driving circuit arranged on the diaphragm. The circuit board is arranged on the outer side of the lower cover plate. The circuit board is in conduction with each driving circuit. The plurality of driving circuits are electrically connected. The vibration directions of adjacent two layers of diaphragms are opposite. The application effectively increases the effective area of the diaphragm by stacking the plurality of planar diaphragms. The sensitivity of the diaphragm assembly and the loudspeaker is greatly improved, and the acoustic performance is improved.

Description

Technical Field

[0001] This application relates to the field of acoustic product technology, and in particular to a diaphragm assembly and a loudspeaker. Background Technology

[0002] Consumer electronics products such as televisions, laptops, tablets, and mobile phones are becoming increasingly thinner and lighter, and the new energy vehicle industry also has similar demands for thinness and lightweight design. While structural thinness is a given, the requirements for acoustic performance are becoming increasingly stringent. Traditional multimedia loudspeakers, due to their paper cone, stator, ferromagnetic magnet, and frame structure, are difficult to make thinner. While miniature loudspeakers for mobile phones can be made thinner, their acoustic performance cannot meet industry requirements due to their small area and limited electromagnetic driving force. The acoustic performance formula for loudspeakers can be found as follows:

[0003] SPL max =112+10log(δ)-10log(R) t α) I

[0004]

[0005] In Formula I, SPL max It is the maximum sound pressure level of the loudspeaker, which is commonly referred to as the sound volume; δ is the loudspeaker efficiency; R t Let δ be the total thermal resistance of the coil to the environment, and α be the thermal coefficient of the voice coil wire. From this formula, it can be seen that the higher the efficiency δ of the loudspeaker, the higher its maximum sound pressure level (SPL). max The larger.

[0006] In Formula II, ρ is the air density, c is the speed of sound in air, B is the magnetic field strength, l is the length of the loudspeaker voice coil, and S... d R is the effective area of ​​the loudspeaker. e It is the resistance of the speaker coil, M ms This refers to the mass of the loudspeaker's vibration system. From this formula, it can be seen that the loudspeaker's efficiency δ is related to (Bl). 2 and S d 2 It is directly proportional, that is, the stronger the magnetic field strength B, the longer the voice coil length l, and the larger the effective area S of the loudspeaker. d The larger the value, the higher the speaker's efficiency δ, and ultimately its maximum sound pressure level SPL. max The larger the size, the more effective these three methods are for improving the acoustic performance of loudspeakers.

[0007] Therefore, how to effectively improve the acoustic performance of loudspeakers without increasing their thickness, or even by reducing their thickness, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, this application proposes a diaphragm assembly and loudspeaker that can effectively improve the acoustic performance of a product.

[0009] This application proposes a diaphragm assembly, comprising a plurality of planar diaphragms stacked and spaced apart from each other, a cavity formed between two adjacent planar diaphragms, the cavity having a vent hole communicating with the outside, each planar diaphragm comprising a diaphragm sheet and driving circuitry disposed on the diaphragm sheet, the plurality of driving circuitry being electrically connected to each other, and the vibration directions of two adjacent diaphragm sheets being opposite.

[0010] In one embodiment, the plurality of drive lines are connected in parallel, and the current directions of two adjacent drive lines are the same or opposite.

[0011] In one embodiment, the plurality of drive lines are connected in series, and the current directions of two adjacent layers of drive lines are opposite.

[0012] In one embodiment, the diaphragm is annular, and the drive circuit is spirally wound on the diaphragm.

[0013] In one embodiment, the spacing between two adjacent planar diaphragms is greater than the sum of the maximum amplitudes of the two adjacent planar diaphragms.

[0014] In one embodiment, each planar diaphragm has a support member on each of its opposite sides, and a cavity is formed between each planar diaphragm and its two adjacent support members. Each support member is provided with a vent hole, so that the cavity communicates with the outside through the vent hole.

[0015] This application also provides a loudspeaker, comprising: an upper cover plate and a lower cover plate disposed opposite to each other, with a receiving space formed between the upper cover plate and the lower cover plate; a magnetic circuit system housed within the receiving space, including an inner magnetic circuit and an outer magnetic circuit surrounding the outer periphery of the inner magnetic circuit; a diaphragm assembly as described above, housed within the receiving space and disposed between the inner magnetic circuit and the outer magnetic circuit; and a circuit board disposed on the outside of the lower cover plate, wherein the circuit board is connected to each of the drive circuits.

[0016] In one embodiment, a magnetic field line is formed between the inner magnetic circuit and the outer magnetic circuit in a horizontal direction, and the magnetic field line is parallel to the plane in which the planar diaphragm is located.

[0017] In one embodiment, the magnetic field lines at the planar diaphragm are oriented horizontally inward or horizontally outward.

[0018] In one embodiment, the inner magnetic circuit includes an inner magnetic component, which is a ring-shaped inner single magnet or a ring structure composed of multiple inner magnets; the outer magnetic circuit includes an outer magnetic component, which is a ring-shaped outer single magnet or a ring structure composed of multiple outer magnets.

[0019] In one embodiment, in two adjacent planar diaphragms, the horizontal direction of the magnetic field lines at the upper planar diaphragm is opposite to that at the lower planar diaphragm.

[0020] In one embodiment, the inner magnetic circuit includes an inner magnetic component, which is an inner single magnet; the outer magnetic circuit includes an outer magnetic component, which is a ring-shaped outer single magnet or a ring structure composed of multiple outer magnets.

[0021] In one embodiment, the support member of the planar diaphragm includes an inner ring plate and an outer ring plate surrounding the inner ring plate. Each planar diaphragm is supported between the inner ring plate and the outer ring plate, and two adjacent planar diaphragms are connected by the support member to form the diaphragm assembly.

[0022] In one embodiment, the vent includes an inner vent and an outer vent. Each of the support members is provided with one of the inner vent and the outer vent. The outer ring plate is provided with at least one first step on one side, which forms the outer vent. The inner ring plate is provided with at least one second step on one side, which forms the inner vent.

[0023] In one embodiment, a front cavity is formed between the inner magnetic circuit and the plurality of inner ring plates, and a rear cavity is formed between the outer magnetic circuit and the plurality of outer ring plates. The inner vent is connected to the front cavity, and the outer vent is connected to the rear cavity.

[0024] In one embodiment, the upper cover plate is provided with a front cavity sound outlet hole communicating with the front cavity, and the lower cover plate is provided with a rear cavity sound outlet hole communicating with the rear cavity.

[0025] In one embodiment, the upper cover plate is provided with a rear cavity sound outlet hole communicating with the rear cavity, and the lower cover plate is provided with a front cavity sound outlet hole communicating with the front cavity.

[0026] In one embodiment, in two adjacent support members, the upper support member is provided with one of the internal vent and the external vent, and the lower support member is provided with the other of the internal vent and the external vent.

[0027] In summary, this application provides a diaphragm assembly and a loudspeaker. By stacking multiple planar diaphragms with adjacent layers vibrating in opposite directions, the effective diaphragm area is effectively increased, significantly improving diaphragm sensitivity and thus enhancing acoustic performance. By stacking as many planar diaphragms as possible within a limited height, forming series or parallel circuits between them, the effective diaphragm area is maximized, improving loudspeaker efficiency and ultimately increasing the maximum sound pressure level. The magnetic circuit arrangement maximizes the magnetic field lines' effect on the driving circuit of the planar diaphragms, avoiding waste and maximizing magnetic induction intensity. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a speaker at one angle in one embodiment of this application.

[0029] Figure 2 for Figure 1 A three-dimensional diagram of the speaker from another angle.

[0030] Figure 3 for Figure 1 An exploded view of the loudspeaker.

[0031] Figure 4 for Figure 1 A cross-sectional view of the loudspeaker.

[0032] Figure 5 for Figure 1 Front view of the internal structure of the loudspeaker.

[0033] Figure 6 for Figure 1 A cross-sectional view of the magnetic circuit system of the loudspeaker.

[0034] Figure 7 for Figure 1 An exploded view of part of the vibration system of a loudspeaker.

[0035] Figure 8 This is a cross-sectional view of a speaker in another embodiment of this application.

[0036] Figure 9 This is a cross-sectional view of a speaker in another embodiment of this application.

[0037] Figure 10 This is a cross-sectional view of a speaker in another embodiment of this application. Detailed Implementation

[0038] Before describing the embodiments in detail, it should be understood that this application is not limited to the detailed structures or element arrangements described below or in the accompanying drawings. This application can be implemented in other ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes only and should not be construed as limiting. The terms "comprising," "including," "having," and similar expressions used herein mean to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "an element," this application does not limit the number of elements to one, but may include multiple elements.

[0039] As mentioned earlier, according to Formulas I and II, the maximum sound pressure level of a loudspeaker increases with its efficiency. The efficiency of a loudspeaker is directly proportional to the square of the effective area of ​​the diaphragm; that is, the efficiency increases with the effective area of ​​the diaphragm. Therefore, increasing the effective area of ​​the diaphragm can improve its sensitivity, i.e., the efficiency of the loudspeaker, thereby increasing the maximum sound pressure level. This application effectively increases the effective area of ​​the diaphragm by stacking planar diaphragms, greatly improving the diaphragm's sensitivity, thus enhancing its acoustic performance, and ultimately improving the acoustic performance of the loudspeaker equipped with this diaphragm.

[0040] Based on this, this application provides a diaphragm assembly comprising multiple planar diaphragms stacked and spaced apart, with a cavity formed between adjacent planar diaphragms, and the cavity having a vent hole communicating with the outside. Each planar diaphragm includes a sheet and driving circuitry disposed on the sheet. The multiple driving circuits are electrically connected, and the vibration directions of adjacent diaphragm layers are set in opposite directions. When current flows through the driving circuitry, the driving circuitry can generate an electromagnetic effect with the magnetic circuit system. The driving circuitry is driven by electromagnetic driving force to vibrate up and down, thereby causing the diaphragm to vibrate up and down to produce sound. Through this design, the effective area of ​​the diaphragm assembly can be effectively increased, thereby greatly improving the sensitivity of the diaphragm assembly and enhancing its acoustic performance.

[0041] Multiple drive circuits can be connected in series or in parallel. When multiple drive circuits are connected in series, the current directions of adjacent drive circuits are set to opposite directions; when multiple drive circuits are connected in parallel, the current directions of adjacent drive circuits can be set to the same or opposite directions. It should be understood that regardless of the electrical connection method, as long as the vibration directions of adjacent diaphragm layers are opposite, the effective diaphragm area can be increased.

[0042] In some embodiments, the diaphragm can be designed in a ring shape, such as a circular ring, and the drive circuit can be wound in a spiral shape on the diaphragm. For example, the drive circuit can be wound in a spiral manner from the radially inner side of the diaphragm in a clockwise or counterclockwise direction to the radially outer side, or it can be wound in a spiral manner from the radially outer side of the diaphragm in a clockwise or counterclockwise direction to the radially inner side. By changing the direction of the winding, the direction of current flow in the drive circuit can be changed, so that the current in the drive circuit flows in a clockwise or counterclockwise direction, thereby changing the electromagnetic effect between the drive circuit and the magnetic circuit system and thus changing the vibration direction of the planar diaphragm.

[0043] To avoid interference between each planar diaphragm and other adjacent planar diaphragms, the spacing between two adjacent planar diaphragms is set to be greater than the sum of the maximum amplitudes of the two adjacent planar diaphragms.

[0044] Each planar diaphragm has a support member on each of its opposite sides. Each planar diaphragm and its two adjacent support members form a cavity. Each support member has a vent hole, which allows the cavity to communicate with the outside. The cavity can generate a pressure difference with the outside space, thereby enabling each planar diaphragm to vibrate normally.

[0045] This diaphragm assembly can be used in acoustic equipment products such as loudspeakers.

[0046] Please also refer to Figures 1 to 3 As shown, this application provides a loudspeaker 10, which includes an upper cover plate 12, a lower cover plate 14, a magnetic circuit system, a diaphragm assembly, and a circuit board 16. The upper cover plate 12 and the lower cover plate 14 are disposed opposite to each other, and a receiving space is formed between the upper cover plate 12 and the lower cover plate 14. The magnetic circuit system and the diaphragm assembly are housed within the receiving space, and the circuit board 16 is disposed on the bottom outer side of the lower cover plate 14. In the illustrated embodiment, the loudspeaker 10 is cylindrical in shape. In other embodiments, the loudspeaker 10 may also be designed in other shapes, such as a square block. This application does not limit the specific shape of the loudspeaker 10. The upper cover plate 12 includes a top plate 18 and a top side plate 20 connected to the periphery of the top plate 18. The lower cover plate 14 includes a bottom plate 22 and a bottom side plate 24 connected to the periphery of the bottom plate 22. Preferably, the top plate 18 and the bottom plate 22 have the same diameter. During installation, the top side plate 20 of the upper cover plate 12 is opposite to the bottom side plate 24 of the lower cover plate 14, and there is a gap between the bottom end of the top side plate 20 and the top end of the bottom side plate 24, so that a gap is formed between the upper cover plate 12 and the lower cover plate 14.

[0047] The magnetic circuit system is installed between the upper cover plate 12 and the lower cover plate 14 and can be positioned using tooling. Specifically, the top end of the magnetic circuit system abuts against the bottom surface of the top plate 18, the bottom end of the magnetic circuit system is supported on the top surface of the bottom plate 22, and the outer wall of the magnetic circuit system abuts against the inner surfaces of the top side plate 20 and the bottom side plate 24. The diaphragm assembly is installed between the upper cover plate 12 and the lower cover plate 14 and can be positioned using tooling. Specifically, the top end of the diaphragm assembly abuts against the bottom surface of the top plate 18, and the bottom end of the diaphragm assembly is supported on the top surface of the bottom plate 22.

[0048] The magnetic circuit system includes an inner magnetic circuit and an outer magnetic circuit surrounding the inner magnetic circuit. Magnetic field lines are formed between the inner and outer magnetic circuits in a horizontal direction, and these magnetic field lines are parallel to the plane on which the planar diaphragm is located. This allows the drive circuitry on the planar diaphragm to generate an electromagnetic effect with the magnetic field lines, thereby driving the planar diaphragm to vibrate up and down.

[0049] In some embodiments, the magnetic field lines at the planar diaphragm are oriented horizontally inward or horizontally outward. The inner magnetic circuit includes an inner magnetic assembly, which can be a single, annular inner magnet or a ring structure composed of multiple inner magnets. The single inner magnet can be a circular ring or other ring-shaped structure, and the multiple inner magnets can form a circular ring structure or other ring-shaped structure, preferably a circular ring structure. The outer magnetic circuit includes an outer magnetic assembly, which can be a single, annular outer magnet or a ring structure composed of multiple outer magnets. The single outer magnet can be a circular ring or other ring-shaped structure, and the multiple outer magnets can form a circular ring structure or other ring-shaped structure, preferably a circular ring structure.

[0050] In other embodiments, in two adjacent planar diaphragms, the horizontal direction of the magnetic field lines at the upper planar diaphragm is opposite to that at the lower planar diaphragm. The inner magnetic circuit includes an inner magnetic assembly, which can be an inner single magnet, preferably a ring-shaped or other ring structure. The outer magnetic circuit includes an outer magnetic assembly, which can be a ring-shaped outer single magnet or a ring structure composed of multiple outer magnets. The outer single magnet can be a ring-shaped or other ring structure, and the multiple outer magnets can form a ring structure or other ring structure, preferably a ring structure.

[0051] In this application, the support member includes an inner ring plate and an outer ring plate surrounding the inner ring plate. Each planar diaphragm is supported between the inner ring plate and the outer ring plate, and adjacent planar diaphragms are connected by the support member to form a diaphragm assembly. From another perspective, the diaphragm assembly includes multiple support members, with each planar diaphragm supported between two adjacent support members. A cavity is formed between each planar diaphragm and its corresponding support member, and the cavity communicates with the outside of the speaker through a corresponding vent hole. Multiple planar diaphragms and multiple support members together constitute the diaphragm assembly.

[0052] Specifically, the vent includes an internal vent and an external vent, and each support member is provided with one of the internal vent and the external vent. The internal magnetic circuit forms a front cavity with multiple inner ring plates, and the external magnetic circuit forms a rear cavity with multiple outer ring plates. The internal vent communicates with the front cavity, and the external vent communicates with the rear cavity.

[0053] In some embodiments, the upper cover plate 12 is provided with a front cavity sound outlet hole communicating with the front cavity, thereby enabling the cavity to communicate with the outside through the inner vent hole, the front cavity, and the front cavity sound outlet hole. The lower cover plate 14 is provided with a rear cavity sound outlet hole communicating with the rear cavity, thereby enabling the cavity to communicate with the outside through the outer vent hole, the rear cavity, and the rear cavity sound outlet hole.

[0054] In other embodiments, the upper cover plate 12 is provided with a rear cavity sound outlet hole that communicates with the rear cavity, thereby enabling the cavity to communicate with the outside through the external vent hole, the rear cavity, and the rear cavity sound outlet hole. The lower cover plate 14 is provided with a front cavity sound outlet hole that communicates with the front cavity, thereby enabling the cavity to communicate with the outside through the internal vent hole, the front cavity, and the front cavity sound outlet hole.

[0055] In a preferred embodiment, among two adjacent support layers, the upper support layer is provided with one of an internal vent and an external vent, and the lower support layer is provided with the other of an internal vent and an external vent.

[0056] In such Figure 1-9 In the illustrated embodiment, the inner magnetic circuit includes a first inner magnet 26 and a second inner magnet 28 symmetrically arranged in a ring. Both the first inner magnet 26 and the second inner magnet 28 are fan-shaped, and the two together form a ring structure with an inner magnetic gap. Similarly, the outer magnetic circuit includes a first outer magnet 30 and a second outer magnet 32 ​​symmetrically arranged in a ring. Both the first outer magnet 30 and the second outer magnet 32 ​​are fan-shaped, and the two together form a ring structure with an outer magnetic gap.

[0057] Preferably, the first outer magnet 30 is arranged around the outer periphery of the first inner magnet 26, and the second outer magnet 32 ​​is arranged around the outer periphery of the second inner magnet 28, and the inner magnetic gap and the outer magnetic gap are in the same straight direction.

[0058] The first inner magnet 26, the second inner magnet 28, the first outer magnet 30, and the second outer magnet 32 ​​are all radially magnetized. In the illustrated embodiment, after radial magnetization, the radial inner surface of the first inner magnet 26 is the S pole and the radial outer surface is the N pole; the radial inner surface of the second inner magnet 28 is the S pole and the radial outer surface is the N pole; the radial inner surface of the first outer magnet 30 is the S pole and the radial outer surface is the N pole; and the radial inner surface of the second outer magnet 32 ​​is the S pole and the radial outer surface is the N pole.

[0059] More specifically, the top surfaces of the first inner magnet 26, the second inner magnet 28, the first outer magnet 30, and the second outer magnet 32 ​​abut against the bottom surface of the top plate 18, for example, by adhesive bonding, thereby fixing the magnetic circuit system relative to the upper cover plate 12; the bottom surfaces of the first inner magnet 26, the second inner magnet 28, the first outer magnet 30, and the second outer magnet 32 ​​are supported on the top surface of the bottom plate 22, for example, by adhesive bonding, thereby fixing the magnetic circuit system relative to the lower cover plate 14. Furthermore, the outer walls of the first outer magnet 30 and the second outer magnet 32 ​​abut against the inner surfaces of the top side plate 20 and the bottom side plate 24, for example, by adhesive bonding, further enhancing the connection stability between the magnetic circuit system and the upper cover plate 12 and the lower cover plate 14.

[0060] Preferably, the first inner magnet 26 and the second inner magnet 28 are arranged to form a circular hole 40 located at the center of the two, and the diameter of the circular hole 40 is greater than or equal to 1.2 mm.

[0061] The diaphragm assembly is located within the annular space between the inner and outer magnetic circuits. Specifically, the diaphragm assembly includes multiple planar diaphragms 34 stacked and spaced apart. Each planar diaphragm 34 includes a diaphragm 36 and a driving circuit 38 disposed on one side of the diaphragm 36. The multiple driving circuits 38 are electrically connected, and the vibrations of adjacent diaphragm layers 36 are set to be opposite. In this embodiment, the diaphragm 36 is annular, and the driving circuit 38 is wound in a spiral shape on the diaphragm 36. The driving circuit 38 is actually a planar voice coil, which can be attached to the diaphragm 36 by adhesive bonding or directly printed on the diaphragm 36 by printing or photolithography.

[0062] In the illustrated embodiment, eight planar diaphragms 34 are provided, that is, eight planar diaphragms 34 are stacked sequentially from top to bottom within the annular space formed by the inner and outer magnetic circuits. For example, the eight planar diaphragms 34 are arranged in eight layers from top to bottom, with the top layer being the first layer and the bottom layer being the eighth layer. Of course, this application does not limit the number of planar diaphragms 34. In other embodiments, the number of planar diaphragms 34 can be set to other numbers depending on the actual thickness of the product.

[0063] The circuit board 16 is connected to each drive circuit 38, forming a series or parallel path between the multiple planar diaphragms 34. For example... Figure 2 As shown, the bottom of the lower cover plate 14 is provided with two positioning posts 42, and the circuit board 16 is provided with two corresponding positioning holes 44. The two positioning posts 42 are respectively positioned and engaged with the two positioning holes 44 for positioning the circuit board 16 and ensuring its positional accuracy. Preferably, the circuit board 16 is located at the center of the bottom surface of the lower cover plate 14, and the two positioning posts 42 are symmetrically distributed upward along one radial direction of the lower cover plate 14.

[0064] The circuit board 16 also has two external connection points 46 that are connected to external circuits and two internal connection points 48 that are connected to the drive circuit 38. The external connection points 46 are connected to external circuits to provide power to the speaker 10. The two external connection points 46 are symmetrically distributed vertically along the line perpendicular to the line connecting the two positioning posts 42, and the two internal connection points 48 are symmetrically distributed horizontally along the line connecting the two positioning posts 42, with the two internal connection points 48 located on the outer side of the two positioning posts 42 respectively.

[0065] In the illustrated embodiment, as Figure 5 As shown, the diaphragm assembly includes multiple support members 50, with each planar diaphragm 34 supported between two adjacent support members 50. Each support member 50 includes an inner ring plate 52 and an outer ring plate 54 surrounding the inner ring plate 52. Preferably, after the planar diaphragm 34 is assembled with the support members 50, the radial outer surface of the diaphragm 36 is flush with the radial outer surface of the outer ring plate 54, and the radial inner surface of the diaphragm 36 is flush with the radial inner surface of the inner ring plate 52. The drive circuit 38 can be disposed between the radial inner and outer support portions on the diaphragm 36 to facilitate the vibration of the diaphragm 36 in the vertical direction under electromagnetic driving force.

[0066] Specifically, such as Figure 8 As shown, there are 9 sets of support members 50. All support members 50 are divided into two types: first support member 56 and second support member 58. The two types of support members are arranged alternately in the vertical direction. That is, for any planar diaphragm 34, the one above the planar diaphragm 34 is one of the first support member 56 and the second support member 58, and the other one below the planar diaphragm 34 is the other of the first support member 56 and the second support member 58.

[0067] like Figure 7 As shown, Figure 7 From top to bottom, the structure consists of a second planar diaphragm 34, a second support member 58, a first planar diaphragm 34, and a first support member 56. The first support member 56 includes a first inner ring plate 60 and a first outer ring plate 62 surrounding the first inner ring plate 60. The first inner ring plate 60 is a complete ring structure. The first outer ring plate 62 has multiple first steps 64 evenly spaced along its circumference on one side, forming external vent holes 66. For example, four first steps 64 are provided. The second support member 58 includes a second inner ring plate 68 and a second outer ring plate 70 surrounding the second inner ring plate 68. The second outer ring plate 70 is a complete ring structure. The second inner ring plate 68 has multiple second steps 72 evenly spaced along its circumference on one side, forming internal vent holes 74. For example, four second steps 72 are provided.

[0068] Preferably, the first inner ring plate 60 and the first outer ring plate 62 have the same height, and the height of the first step 64 is half the height of the first outer ring plate 62. The second inner ring plate 68 and the second outer ring plate 70 have the same height, and the height of the second step 72 is half the height of the second inner ring plate 68.

[0069] It should be noted that, among all the support members 50, the height of each support member 50 located in the middle should be set to be greater than the sum of the maximum amplitudes of the two planar diaphragms 34 adjacent to that support member 50; the height of the top support member 50 should be set to be greater than the maximum amplitude of the lower planar diaphragm 34 adjacent to it; and the height of the bottom support member 50 should be set to be greater than the maximum amplitude of the upper planar diaphragm 34 adjacent to it, so as to ensure that the multiple support members 50 do not interfere with each other when vibrating.

[0070] like Figure 8 As shown, the topmost support member 56 is the first support member 56, and the bottommost support member 56 is also the first support member 56. From the top to the bottom, the first support member 56 and the second support member 58 are arranged alternately. The top surface of the topmost first support member 56 is attached to the bottom surface of the top plate 18, for example, by adhesive; the bottom surface of the bottommost first support member 56 is supported on the top surface of the bottom plate 22, for example, by adhesive. Each planar diaphragm 34 can also be connected and fixed to its two adjacent support members 50 by adhesive.

[0071] Please refer to Figure 8 As shown, a front cavity 76 is formed between the inner magnetic circuit and multiple inner ring plates 52, and a rear cavity 78 is formed between the outer magnetic circuit and multiple outer ring plates 54. Each planar diaphragm 34 forms a cavity 80 between itself and its corresponding support member 50. For example, a portion of the cavity 80 is connected to the front cavity 76 through an inner vent 74, and another portion of the cavity 80 is connected to the rear cavity 78 through an outer vent 66.

[0072] The top plate 18 is provided with a plurality of front cavity sound outlet holes 82 communicating with the front cavity 76, and the bottom plate 22 is provided with a plurality of rear cavity sound outlet holes 84 communicating with the rear cavity 78. The front cavity sound outlet holes 82 are located between the inner magnetic circuit and the inner ring plate 52, and the rear cavity sound outlet holes 84 are located between the outer magnetic circuit and the outer ring plate 54. In the illustrated embodiment, the plurality of front cavity sound outlet holes 82 are evenly spaced at 360 degrees along one circumferential direction, and the plurality of rear cavity sound outlet holes 84 are evenly spaced at 360 degrees along another circumferential direction.

[0073] In some embodiments, the stacked drive lines 38 are connected in parallel with the circuit board 16, so that the multiple planar diaphragms 34 are connected in parallel. When the multiple planar diaphragms 34 are connected in parallel, the bottommost drive line 38 is connected in parallel between two internal connection points 48.

[0074] Please also refer to Figure 5 and Figure 7 As shown, each drive line 38 has two external conductive points 86 protruding from the outer edge of the diaphragm 36 at opposite radial ends. These two external conductive points 86 are located, for example, in the straight line direction of the magnetic gap between the inner and outer magnetic circuits. Between adjacent drive lines 38, the upper and lower external conductive points 86 on the same side are connected. For example, the upper and lower external conductive points 86 on the same side are connected by a conductive connector 88. The conductive connector 88 is, for example, an elastic conductive connector; in the illustrated embodiment, the conductive connector 88 is an elastic conductive post. In the bottommost drive line 38, one of its external conductive points 86 passes through the lower cover plate 14 and is connected to an internal connection point 48 corresponding to the circuit board 16. The other external conductive point 86 passes through the lower cover plate 14 and is connected to another internal connection point 48 corresponding to the circuit board 16. This allows multiple planar diaphragms 34 to be connected in parallel.

[0075] In some embodiments, the stacked drive lines 38 are connected in series with the circuit board 16, so that the multiple planar diaphragms 34 are connected in series. When the multiple planar diaphragms 34 are connected in series, one end of the bottom drive line 38 is connected to one of the internal connection points 48, and one end of the top drive line 38 is connected to another of the internal connection points 48.

[0076] Please refer to Figure 9 As shown, each drive line 38 has a spiral winding start and end. Taking the first and second layer drive lines 38 as examples, the first layer drive line 38 winds clockwise from the radial outer side to the radial inner side, and the second layer drive line 38 winds counterclockwise from the radial inner side to the radial outer side. The start of the first layer drive line 38 is connected to the end of the second layer drive line 38 through a conductive connector 88, and the end of the first layer drive line 38 is connected to one of the internal connection points 48 of the circuit board 16 through a conductive connector 88. Similarly, the remaining six layers of drive lines 38 are all connected in series according to the above winding and connection method. The start of the bottom layer drive line 38 is connected to another internal connection point 48 of the circuit board 16 through a conductive connector 88, ultimately achieving series connection between the eight planar diaphragms 34 and the circuit board 16.

[0077] In the illustrated embodiment, in two adjacent planar diaphragm layers 34, the current direction of the upper driving circuit 38 is opposite to the current direction of the lower driving circuit 38. Please refer to... Figure 6As shown, depending on the magnetization direction, the magnetic field lines run horizontally from the inner magnetic path towards the N pole on the outside to the outer magnetic path towards the S pole on the inside. Therefore, the direction of the magnetic field lines at the planar diaphragm 34 is either horizontally inward or horizontally outward. Regarding the current direction, assuming the first layer of drive circuit 38 is clockwise, then the second layer of drive circuit 38 is counterclockwise, and so on, continuing in the same manner until the eighth layer of drive circuit 38.

[0078] Please also refer to Figure 8 As shown, based on the current direction described above, taking the first and second planar diaphragms 34 as examples, the current direction of the first driving circuit 38 is clockwise, and the current direction of the second driving circuit board 38 is counterclockwise. When all planar diaphragms 34 are energized, under the influence of the magnetic field, the first and second diaphragms 36 move in opposite directions. That is, the first and second diaphragms 36 move inward simultaneously (approaching each other) or outward simultaneously (moving away from each other), thus creating a pressure difference between the front and rear cavities. Similarly, the movement patterns of the third, fourth, fifth, sixth, seventh, and eighth diaphragms 36 are the same as those of the first and second diaphragms 36.

[0079] like Figure 10 As shown, this embodiment is... Figure 4 The illustrated embodiment adds an external magnetic circuit and an external diaphragm assembly. In other embodiments, it is also possible to... Figure 10 Based on the illustrated embodiment, one or more sets of external magnetic circuits and external diaphragm assemblies are added.

[0080] Specifically, the external magnetic circuit also includes a third outer magnet 90 and a fourth outer magnet 92 symmetrically arranged in a ring, surrounding the first outer magnet 30 and the second outer magnet 32. Specifically, the third outer magnet 90 surrounds the first outer magnet 30, and the fourth outer magnet 92 surrounds the second outer magnet 32. Both the third outer magnet 90 and the fourth outer magnet 92 are radially magnetized, such that the inner radial surface of the third outer magnet 90 is the S pole and the outer radial surface is the N pole, and the inner radial surface of the fourth outer magnet 92 is the S pole and the outer radial surface is the N pole. Multiple planar diaphragms 34 are stacked between the first outer magnet 30, the second outer magnet 32, the third outer magnet 90, and the fourth outer magnet 92. For example, eight layers of planar diaphragms 34 are provided. The structural arrangement, magnetic circuit direction, current direction, support structure, and series / parallel connection methods of the eight planar diaphragms 34 are similar to those in the above embodiments and will not be repeated here. In this embodiment, the front cavity sound outlet 82 has two sound outlets, one on the inner ring and one on the outer ring, and the rear cavity sound outlet 84 also has two sound outlets, one on the inner ring and one on the outer ring. The circuit board 16 has two input and two output circuits. The diaphragm circuits on the inner ring side and the diaphragm circuits on the outer ring side are connected and conductive in both series and parallel configurations on the circuit board 16.

[0081] This application also provides a loudspeaker device, which is configured with the diaphragm assembly as described above or with the loudspeaker 10 as described above. The acoustic performance of the loudspeaker device can be improved by using the diaphragm assembly or the loudspeaker 10.

[0082] In summary, this application provides a diaphragm assembly and a loudspeaker. By stacking multiple planar diaphragms with adjacent layers vibrating in opposite directions, the effective diaphragm area is effectively increased, significantly improving diaphragm sensitivity and thus enhancing acoustic performance. By stacking as many planar diaphragms as possible within a limited height, forming series or parallel circuits between them, the effective diaphragm area is maximized, improving loudspeaker efficiency and ultimately increasing the maximum sound pressure level. The magnetic circuit arrangement maximizes the magnetic field lines' effect on the driving circuit of the planar diaphragms, avoiding waste and maximizing magnetic induction intensity.

[0083] The concepts described herein may be implemented in other forms without departing from their spirit and characteristics. The specific embodiments disclosed should be considered illustrative rather than restrictive. Therefore, the scope of this application is determined by the appended claims, and not by the preceding description. Any changes within the literal meaning and equivalent scope of the claims should fall within the scope of those claims.

Claims

1. A diaphragm assembly, characterized in that, The device includes multiple planar diaphragms stacked and spaced apart. A cavity is formed between adjacent planar diaphragms, and the cavity has a vent hole communicating with the outside. Each planar diaphragm includes a diaphragm sheet and driving circuitry on the diaphragm sheet. The multiple driving circuitry are electrically connected, and the vibration directions of adjacent diaphragm sheets are opposite. Support members are provided on opposite sides of each planar diaphragm. The cavity is formed between each planar diaphragm and its corresponding two adjacent support members. Each support member has the vent hole, so that the... The cavity communicates with the outside through the vent hole; the support member of the planar diaphragm includes an inner ring plate and an outer ring plate surrounding the inner ring plate. Each planar diaphragm is supported between the inner ring plate and the outer ring plate. The vent hole includes an inner vent hole and an outer vent hole. Each support member is provided with one of the inner vent hole and the outer vent hole. At least one first step is provided on one side of the outer ring plate, and the at least one first step forms the outer vent hole. At least one second step is provided on one side of the inner ring plate, and the at least one second step forms the inner vent hole.

2. The diaphragm assembly as described in claim 1, characterized in that, Multiple drive lines are connected in parallel, and the current directions of two adjacent drive lines are the same or opposite.

3. The diaphragm assembly as described in claim 1, characterized in that, The multiple drive lines are connected in series, and the current directions of two adjacent drive lines are opposite.

4. The diaphragm assembly as described in any one of claims 1-3, characterized in that, The diaphragm is ring-shaped, and the drive circuit is spirally wound on the diaphragm.

5. The diaphragm assembly as claimed in claim 1, characterized in that, The spacing between two adjacent planar diaphragms is greater than the sum of the maximum amplitudes of the two adjacent planar diaphragms.

6. A loudspeaker, characterized in that, include: An upper cover plate and a lower cover plate are arranged opposite to each other, and a receiving space is formed between the upper cover plate and the lower cover plate; A magnetic circuit system, housed within the housing space, includes an inner magnetic circuit and an outer magnetic circuit surrounding the inner magnetic circuit; The diaphragm assembly as described in any one of claims 1-5 is housed within the housing space and disposed between the inner magnetic circuit and the outer magnetic circuit; and A circuit board is disposed on the outside of the lower cover plate, and the circuit board is connected to each of the drive circuits.

7. The loudspeaker as claimed in claim 6, characterized in that, A magnetic field line is formed between the inner magnetic circuit and the outer magnetic circuit in a horizontal direction, and the magnetic field line is parallel to the plane where the planar diaphragm is located.

8. The loudspeaker as claimed in claim 7, characterized in that, The magnetic field lines at the planar diaphragm are directed horizontally inward or horizontally outward.

9. The loudspeaker as claimed in claim 8, characterized in that, The inner magnetic circuit includes an inner magnetic component, which is a ring-shaped inner single magnet or a ring structure composed of multiple inner magnets; the outer magnetic circuit includes an outer magnetic component, which is a ring-shaped outer single magnet or a ring structure composed of multiple outer magnets.

10. The loudspeaker as claimed in claim 7, characterized in that, In two adjacent planar diaphragms, the horizontal direction of the magnetic field lines at the upper planar diaphragm is opposite to that at the lower planar diaphragm.

11. The loudspeaker as claimed in claim 10, characterized in that, The inner magnetic circuit includes an inner magnetic component, which is an inner single magnet; the outer magnetic circuit includes an outer magnetic component, which is a ring-shaped outer single magnet or a ring structure composed of multiple outer magnets.

12. The loudspeaker as claimed in any one of claims 6-11, characterized in that, The two adjacent planar diaphragms are connected by the support to form the diaphragm assembly.

13. The loudspeaker as claimed in claim 12, characterized in that, The inner magnetic circuit forms a front cavity with the plurality of inner ring plates, the outer magnetic circuit forms a rear cavity with the plurality of outer ring plates, the inner vent is connected to the front cavity, and the outer vent is connected to the rear cavity.

14. The loudspeaker as claimed in claim 13, characterized in that, The upper cover plate is provided with a front cavity sound outlet hole communicating with the front cavity, and the lower cover plate is provided with a rear cavity sound outlet hole communicating with the rear cavity.

15. The loudspeaker as claimed in claim 13, characterized in that, The upper cover plate is provided with a rear cavity sound outlet hole communicating with the rear cavity, and the lower cover plate is provided with a front cavity sound outlet hole communicating with the front cavity.

16. The loudspeaker as claimed in claim 12, characterized in that, In the two adjacent support members, the upper support member is provided with one of the internal vent and the external vent, and the lower support member is provided with the other of the internal vent and the external vent.

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