Planar transducers and speakers

Abstract

The present invention belongs to the technical field of speakers, and specifically relates to a planar transducer. The planar transducer of the present invention includes a frame, a magnetic circuit assembly, a diaphragm assembly, and a cover plate. An accommodation chamber is provided inside the frame. One end of the accommodation chamber has an opening. The magnetic circuit assembly is provided in the accommodation chamber. The magnetic circuit assembly includes a magnetic conductive plate and a magnet assembly attached to the magnetic conductive plate. The magnet assembly includes N first magnets and N - 1 second magnets, where N is 3 or more. The first magnets and the second magnets are sequentially and alternately attached and installed. The magnetic pole directions of the first magnets and the second magnets are perpendicular to each other. And in the magnet assembly, the magnetic pole directions of any two adjacent magnets of the same type, which are arranged at intervals from other types of magnets, are installed in opposite directions. The diaphragm assembly includes a base layer and a voice coil layer. The base layer is provided to cover the opening of the accommodation chamber. The voice coil layer is attached and connected to one side of the base layer. The other side of the base layer is installed facing the magnetic circuit assembly. The cover plate is provided to cover the opening of the accommodation chamber and is provided opposite to the voice coil layer.

Description

[Technical Field]

[0001] The present invention relates to the field of loudspeaker technology, and more particularly to a planar transducer and a loudspeaker including the planar transducer. [Background technology]

[0002] With the rapid development of electroacoustic products, people's requirements for sound quality are becoming higher and higher. To ensure that speakers have good sound performance, high resolution, high efficiency, and low distortion, innovation and improvement are required. For treble, midrange, or earphone speakers, the traditional dome or wheel speaker model can no longer meet the demands of modern users and the market. The adoption of flat speaker units has become a new standard launched by more and more manufacturers.

[0003] Currently, the magnetic energy of planar transducers in current technology is relatively low, and the sound quality of planar transducers cannot meet the needs of many consumers. To increase the magnetic energy, conventional planar speaker units typically use a method of increasing the number of magnets, which requires installing two sets of magnetic stripes on the front and back of the planar diaphragm. As a result, the sound radiating directly from the surface of the diaphragm to the ear is blocked by the magnetic stripes, creating shielding and interference during transmission, which affects the sound radiation effect and reduces sound quality.

[0004] Traditional planar diaphragm materials use an ultrathin nanoscale polyester film as the base layer, on which a sheet of aluminum foil is placed under negative pressure and then etched to form a circuit, ultimately forming a planar circuit voice coil. The primary reason for using this material is to minimize the mass of the diaphragm per unit area, while also achieving high sound pressure levels and high-frequency ductility and resolution. While many brands boast this material, this wrap-like polyester film suffers from defects such as poor toughness, low rigidity, and insufficient resilience, which detract from the quality of the diaphragm and its high fidelity sound. First, the sound is thin, lacks weight, and lacks roundness. Second, the thin diaphragm distorts the mid- and low-frequency sounds when used at high power levels. Third, etching the high-frequency region of the aluminum voice coil creates a sharp, burly sound. Summary of the Invention

[0005] The objective of the present invention is to at least solve the problems of the sound emitted from the planar transducer being obstructed and interfered by the magnetic strip during transmission, resulting in degradation of quality and distortion caused by the planar vibrating membrane assembly, etc. This objective is achieved by the following technical solution.

[0006] a magnetic circuit assembly including a base layer and a voice coil layer, the base layer covering the opening of the accommodating chamber, the voice coil layer being connected to one side of the base layer and the other side facing the magnetic circuit assembly; and a cover plate covering the opening of the accommodating chamber, the cover plate facing the voice coil layer, the cover plate having a first sound outlet.

[0007] In the planar transducer of the present invention, a plurality of first magnets and a plurality of second magnets are closely arranged and sequentially placed, with the magnetic poles of the first magnets and the second magnets perpendicular to each other, and any two of the magnets are arranged with the magnetic poles of the same magnets spaced apart but opposite to each other. The magnets are arranged in a Halbach array, effectively improving the magnetic flux of the magnetic circuit assembly and further enhancing the sensitivity of the planar transducer. At the same time, the voice coil layer of the diaphragm assembly is placed on one side of the base, and the magnetic circuit assembly is placed on the other side of the base. When the planar transducer vibrates to generate sound, the diaphragm assembly vibrates due to the magnetic field of the magnetic circuit assembly, and the sound is transmitted to the outside of the frame from the side of the base where the voice coil layer is located, without being shielded or interfered with by magnets during sound transmission. This reduces sound distortion, flattens the frequency curve, and effectively improves the sound quality of the planar transducer.

[0008] Furthermore, the planar transducer of the present invention can have the following additional technical features.

[0009] In some embodiments of the present invention, the direction of the magnetic field lines of the first magnet is parallel to the plate surface of the magnetic plate, and the direction of the magnetic field lines of the second magnet is perpendicular to the plate surface of the magnetic plate, or the direction of the magnetic field lines of the first magnet is perpendicular to the plate surface of the magnetic plate, and the direction of the magnetic field lines of the second magnet is parallel to the plate surface of the magnetic plate.

[0010] In some embodiments of the present invention, any adjacent first magnets and any adjacent second magnets are arranged alternately in a concave-convex pattern toward one end face of the magnetic permeable plate, and any adjacent first magnets and any adjacent second magnets are arranged aligned away from the other end face of the magnetic permeable plate.

[0011] In some embodiments of the present invention, the height dimension of the first magnet is smaller than the height dimension of the second magnet in a direction perpendicular to the plate surface of the magnetic conductive plate, and the cross-sectional area of ​​the first magnet is smaller than the cross-sectional area of ​​the second magnet.

[0012] In some embodiments of the present invention, in a direction parallel to the plate surface of the magnetic conductive plate, the width dimension of the first magnet is smaller than the width dimension of the second magnet, and the cross-sectional area of ​​the first magnet is smaller than the cross-sectional area of ​​the second magnet.

[0013] In some embodiments of the present invention, the magnetically conductive plate includes a main plate portion and side plate portions provided on both sides of the main plate portion, the main plate portion and the side plate portions on both sides are surrounded by a U-shaped structure, and the multiple magnets are provided within the U-shaped structure and attached to the plate surface of the main plate portion.

[0014] In some embodiments of the present invention, the base layer and the voice coil layer of the diaphragm assembly are integrally formed, the base layer is a PI film, the voice coil layer is electrolytic copper bonded to the surface of the PI film, and the electrolytic copper is etched to form the voice coil layer.

[0015] In some embodiments of the present invention, the vibrating membrane assembly further includes an anti-oxidation coating, and the anti-oxidation coating is coated on the surface of the electrolytic copper of the voice coil layer.

[0016] In some embodiments of the present invention, the vibrating membrane assembly further includes a hanging frame, the hanging frame being disposed around an edge of the base layer, and the base layer being connected to the frame by the hanging frame.

[0017] Another aspect of the present invention provides a loudspeaker including the planar transducer according to any one of the above technical solutions. [Brief explanation of the drawings]

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are used only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention, and like parts are designated by like reference numerals throughout the drawings. [Figure 1] 1 is a schematic cross-sectional view of a planar transducer according to some embodiments of the present application. [Figure 2] 1 is a schematic front view of a planar transducer according to some embodiments of the present application. [Figure 3] 1 is a schematic exploded view of a planar transducer according to some embodiments of the present application. [Figure 4] 1 is a structural schematic diagram of a frame according to some embodiments of the present application. [Figure 5] 1 is a structural schematic diagram of a vibrating membrane assembly according to some embodiments of the present application. [Figure 6] 1 is a structural schematic diagram of a magnetic circuit assembly according to some embodiments of the present application. [Figure 7] 1 is a structural schematic diagram of a magnetic permeable plate according to some embodiments of the present application. [Figure 8] 1 is a structural schematic diagram of a magnet assembly according to some embodiments of the present application. [Figure 9]1 is a schematic diagram of an assembled structure of a base layer and a voice coil layer according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019]

[0023] Exemplary embodiments of the present invention will now be described in more detail with reference to the drawings. While the drawings show exemplary embodiments of the present invention, it should be understood that the present invention is not limited to the embodiments described herein, and can be embodied in various forms. On the contrary, these embodiments are provided to facilitate a better understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0020] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "said" can also refer to the plural, unless expressly stated otherwise. The terms "comprise," "contain," "including," and "having" are inclusive and indicate the presence of described features, steps, operations, components, and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, components, members, and / or combinations thereof. The methods, steps, processes, and operations described herein should not be construed as requiring performance in the particular order described or illustrated, unless an order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be employed.

[0021] Although multiple components, members, regions, layers, and / or sections may be described using terms such as first, second, and third, these components, members, regions, layers, and / or sections should not be limited by these terms. These terms are used only to separate one component, member, region, layer, or segment from another region, layer, or segment. Terms such as "first," "second," and other digital terms, when used herein, do not imply order or sequentiality unless expressly indicated in the specification. Thus, a first component, member, region, layer, or segment described below could be referred to as a second component, member, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0022] For ease of description, spatial relative terms may be used herein to describe the relationship of one part or feature, as illustrated, to the relationship of another part or feature, such as "interior," "exterior," "inside," "outside," "below," "downward," "above," "upward," etc. Such spatial relative terms are meant to include different orientations of the device in use or operation other than the orientation shown. For example, if the device in the drawings is inverted, parts described as "below other parts or features" or "below other parts or features" would be oriented "above other parts or features" or "above other parts or features." Thus, examples of the term "below" can include above and below orientations. The device may be otherwise oriented, "rotated 90 degrees or in other directions," and the spatial relative descriptions used herein may be interpreted accordingly.

[0023] 1 to 9, in some embodiments of the present invention, a planar transducer 1 includes a frame 10, a magnetic circuit assembly 20, a vibrating membrane assembly 30, and a cover plate 40. Specifically, an accommodation chamber 11 is provided inside the frame 10, and the magnetic circuit assembly 20 is provided inside the accommodation chamber 11. By covering an opening at one end of the accommodation chamber 11 with the vibrating membrane assembly 30, a magnetic circuit is formed inside the accommodation chamber 11, and the vibrating membrane assembly 30 at the opening of the accommodation chamber 11 is excited to vibrate, generating acoustic energy. The magnetic circuit assembly 20 of this embodiment includes a magnetic permeable plate 21 and a magnet assembly 22 attached to the surface of the magnetic permeable plate 21, the magnet assembly 22 including N first magnets 221 and N-1 second magnets 222, where N is 3 or more, the first magnets 221 and the second magnets 222 being attached alternately in sequence with no gap between them, the magnetic pole directions of the first magnets 221 and the second magnets 222 being perpendicular to each other, and any two of the magnets in the magnet assembly 22 being adjacent to each other and spaced apart from each other, with the magnetic pole directions of the same magnets being opposite to each other. The vibrating membrane assembly 30 includes a base layer 31 and a voice coil layer 32, the base layer 31 being disposed to cover the opening of the accommodating chamber 11, the voice coil layer 32 being attached to one side of the base layer 31, and the other side of the base layer 31 facing the magnetic circuit assembly 20. Similarly, the cover plate 40 is provided to cover the opening at one end of the accommodating chamber 11 and is provided opposite the voice coil layer 32. The cover plate 40 and the frame 10 form a case structure, and the magnetic circuit assembly 20 and the vibrating membrane assembly 30 are placed within the case structure formed by the cover plate 40 and the frame 10, facilitating assembly and sound generation of the planar transducer 1. The cover plate 40 is provided with a plurality of first sound holes 41, so that when the vibrating membrane assembly 30 vibrates, sound generated from the front can be transmitted through the first sound holes 41.

[0024] According to the planar transducer 1 of the present invention, a plurality of first magnets 221 and a plurality of second magnets 222 are sequentially and alternately attached and installed, and the magnetic pole directions of the first magnets 221 and the second magnets 222 are perpendicular to each other, and any two of the plurality of magnets are installed opposite to the magnetic pole directions of the same type of magnets that are adjacent to each other and arranged with a gap between them, thereby arranging the plurality of magnets in a Halbach array, thereby effectively improving the magnetic flux of the magnetic circuit assembly 20 and further improving the sensitivity of the planar speaker. At the same time, the voice coil layer 32 is placed on one side of the base layer 31, and the magnetic circuit assembly 22 is placed on the other side of the base layer 31. When the planar transducer 1 vibrates to produce sound, the vibrating membrane assembly 30 vibrates due to the magnetic field of the magnetic circuit assembly 20 to produce sound, and the sound is transmitted to the outside of the frame 10 from the side of the base layer 31 where the voice coil layer 32 is installed. This prevents the sound from being shielded or interfered with by the magnet during sound transmission, thereby reducing sound distortion and making the frequency curve flatter, and further effectively improving the sound quality of the planar transducer 1.

[0025] 1 to 4, in some embodiments of the present invention, a receiving chamber 11 for mounting a magnetic circuit assembly 20 is formed inside a frame 10. A first mounting seat 12 and a second mounting seat 13 are provided in the receiving chamber 11 at a distance from each other in the longitudinal direction, and both ends of the magnetic circuit assembly 20 in the longitudinal direction are fixedly connected to the first mounting seat 12 and the second mounting seat 13, respectively, and a specific connection method may be bolt connection.

[0026] 6 to 8, in some embodiments of the present invention, the magnetic circuit assembly 20 includes a magnetic permeable plate 21 and a magnet assembly 22 attached to the plate surface of the magnetic permeable plate 21. The magnet assembly 22 includes nine first magnets 221 and eight second magnets 222, and the first magnets 221 and the second magnets 222 are attached alternately in sequence; specifically, the first magnets 221 and the second magnets 222 are connected by adhesive to form the magnet assembly 22 and facilitate connection with the magnetic permeable plate 21. The direction of the magnetic field lines of the first magnet 221 is parallel to the surface of the magnetic permeable plate 21, and the direction of the magnetic field lines of the second magnet 222 is perpendicular to the surface of the magnetic permeable plate 21, and the magnetic pole directions of the same type of magnets arranged adjacent to each other and spaced apart from each other in the magnet assembly 22 are opposite to each other, i.e., the magnetic pole directions of the two second magnets 222 located on either side of the same first magnet 221 are opposite to each other, or the magnetic pole directions of the two first magnets 221 located on either side of the same second magnet 222 are opposite to each other. For the purpose of explanation, the directions of the magnetic field lines are indicated by "↑", "↓", "←", and "→", respectively, and the direction indicated by the arrow represents the direction of the N pole, which can be distributed as follows from smallest to largest depending on the number of magnets:

[0027] When the number of magnets in the magnet assembly 22 is five, that is, including three first magnets 221 and two second magnets 222, the direction of the magnetic field distribution in the magnet assembly 22 is "→↑←↓→".

[0028] When the number of magnets in the magnet assembly 22 is seven, that is, including four first magnets 221 and three second magnets 222, the direction of the magnetic field distribution in the magnet assembly 22 is "→↑←↓→↑←".

[0029] When the number of magnets in the magnet assembly 22 is nine, that is, including five first magnets 221 and four second magnets 222, the direction of the magnetic field distribution in the magnet assembly 22 is "→↑←↓→↑←↓→".

[0030] When the number of magnets in the magnet assembly 22 is 11, that is, including six first magnets 221 and five second magnets 222, the direction of the magnetic field distribution in the magnet assembly 22 is "→↑←↓→↑←↓→↑←".

[0031] In this embodiment, the number of magnets in the magnet assembly 22 is 17, including 9 first magnets 221 and 8 second magnets 222, and the direction of the magnetic field distribution in the magnet assembly 22 is "→↑←↓→↑←↓→↑←↓→↑←↓→".

[0032] In other embodiments, if size and quality allow, the Halbach array can continue to grow according to demand.

[0033] It can be seen that the magnet assembly 22 of this embodiment is distributed according to a Halbach array based on the arrangement of the first magnet 221 and the second magnet 222. The Halbach array can significantly increase the magnetic force of a planar magnetic field, so a high-density magnetic field can be achieved by simply providing one Halbach array on one side of the diaphragm assembly 30. Furthermore, no magnets are installed in the sound output direction of the diaphragm assembly 30, which reduces or avoids shielding and interference during the sound transmission process, significantly reducing sound distortion and making the frequency curve flatter.

[0034] The Halbach array is a permanent magnet arrangement in which permanent magnets with different magnetization directions are arranged in a fixed order, significantly enhancing the magnetic field on one side of the array. This distribution method was invented by American Heierbeck (patent application filed in 1979), but this invention integrates and improves it, and is the first to apply it to the speaker field.

[0035] As shown in FIG. 8, unlike the Halbach array, in some embodiments of the present invention, in the direction perpendicular to the plate surface of the magnetic permeable plate 21, the height dimension of the first magnet 221 in this embodiment is smaller than the height dimension of the second magnet 222, and the cross-sectional area of ​​the first magnet 221 is smaller than the cross-sectional area of ​​the second magnet 222.

[0036] As shown in FIG. 8, unlike the Halbach array, in some embodiments of the present invention, in a direction parallel to the plate surface of the magnetic permeable plate 21, the width dimension of the first magnet 221 in this embodiment is smaller than the width dimension of the second magnet 222, and the cross-sectional area of ​​the first magnet 221 is smaller than the cross-sectional area of ​​the second magnet 222.

[0037] As shown in FIG. 8, unlike the Halbach array, in some embodiments of the present invention, any adjacently placed first magnets 221 and second magnets 222 are aligned toward the surface of the base layer 31, and any adjacently placed first magnets 221 and second magnets 222 are alternately arranged in a concave-convex pattern toward the surface of the magnetic permeable plate 21, making it easier to assemble and fix the first magnets 221 and second magnets 222 to the magnetic permeable plate 21.

[0038] 6 and 7, unlike the Halbach array, in some embodiments of the present invention, a magnetically conductive plate 21 is added based on the Halbach array to accommodate the installation of the first magnet 221 and the second magnet 222. The magnetically conductive plate 21 includes a main plate portion 211 and side plate portions 212 provided on both sides of the main plate portion 211. The main plate portion 211 and the side plate portions 212 on both sides are surrounded by a U-shaped structure, and the multiple first magnets 221 and the multiple second magnets 222 are both provided within the U-shaped structure and attached to the plate surface of the main plate portion 211.

[0039] Specifically, the surface of the main plate portion 211 facing the magnet assembly 22 is provided with N protrusions 213 and N-1 recesses 214, of which the number of protrusions 213 matches the number of first magnets 221, the number of recesses 214 matches the number of second magnets 222, and the arrangement of the N protrusions 213 and the N-1 recesses 214 matches the arrangement of the N first magnets 221 and the N-1 second magnets 222. The difference in height between the protrusions 213 and the recesses 214 matches the difference in height between the first magnets 221 and the second magnets 222, and the width of the protrusions 213 matches the width of the first magnets 221, and the width of the recesses 214 matches the width of the second magnets 222. As a result, when the magnet assembly 22 and the magnetic permeable plate 21 are assembled, the second magnet 222 can be locked between the two protrusions 213 and abut against the recess 214, and the protrusions 213 can be locked between the two second magnets 222 and abut against the first magnet 221. This achieves a seamless connection between the magnet assembly 22 and the magnetic permeable plate 21 and ensures that the magnetic circuit assembly 20 has maximum magnetic flux. The side plates 212 provided on both sides of the main plate 221 surround the magnet assembly 22 and further prevent magnetic field diffusion and magnetic leakage from the magnet assembly 22.

[0040] Unlike traditional Halbach arrays, the magnet assembly 22 of this embodiment is an improvement over the conventional Halbach array. First, while the cross-sectional dimensions of all magnets in a conventional Halbach array are consistent, the magnetic circuit assembly 20 of this embodiment reduces the cross-sectional area of ​​the magnets whose magnetic field lines are horizontally oriented (← and →). This reduces the cross-sectional area of ​​the first magnet 221, making it easier to shorten the horizontal distance between two adjacent second magnets 222, reducing the magnetic gap between the two second magnets 222 and further increasing the magnetic force within the magnetic gap. This also simplifies assembly of the magnetic circuit assembly 20 and reduces costs. Second, the magnetic circuit assembly 20 of this embodiment adds magnetic permeable plates 21 around the magnets of the conventional Halbach array. The installation of the magnetic permeable plates 21 further enhances the magnetic flux of the magnetic circuit assembly 20, prevents magnetic field diffusion, and prevents magnetic leakage, facilitating assembly and fixing of the magnet assembly 22.

[0041] The greatest advantage of the magnetic circuit assembly 20 of this embodiment is the improved surface magnetic flux of the planar magnetic field. Assuming that the magnetic circuit is constructed using a neodymium-iron-boron ferromagnetic material labeled N50, the surface magnetic flux of a traditional planar magnetic field is generally about 3000 G-4000 G (G is Gauss), while a conventional Halbach array can reach about 5000 G-6000 G. A Halbach array with an additional U-shaped magnetic permeable plate can reach about 6000 G-7000 G or more, significantly increasing the magnetic flux of the planar magnetic field. Therefore, using an improved magnetic circuit that can achieve more than twice the magnetic flux of a typical planar magnetic field also improves its sensitivity and efficiency by more than two times. Therefore, by simply installing one set of magnetic circuit assembly 20 on one side of the vibrating membrane assembly 30, this embodiment is superior to the traditional two sets of magnetic circuits installed on both sides of the vibrating membrane. Furthermore, there is no shielding of the magnet in the sound-emitting direction of the vibrating membrane assembly 30, so the sound emitted by the vibrating membrane assembly 30 is not shielded or interfered with during transmission, reducing distortion and making the frequency curve flatter.

[0042] Traditional planar diaphragm materials use an ultrathin nanoscale polyester film as the base layer, which is then vacuumed onto a sheet of aluminum foil and etched to form a circuit, ultimately forming a planar circuit voice coil. The primary reason for using this material is to minimize the mass of the diaphragm per unit area, while also achieving high sound pressure levels and high-frequency ductility and resolution. While many brands pride themselves on this material, this wrap-like polyester film suffers from defects such as poor toughness, low rigidity, and insufficient resilience, which detract from the quality of the diaphragm and its high fidelity sound. First, the sound is thin, lacks weight, and lacks roundness. Second, the thin diaphragm distorts the mid- and low-frequency sounds when used at high power levels. Third, etching the high-frequency region of the aluminum voice coil creates a sharp, burly sound.

[0043] 9, in some embodiments of the present invention, the base layer 31 and voice coil layer 32 are an integral structure. The base layer 31 is a DuPont-standard PI film with a thickness on the order of microns, i.e., the median thickness is approximately 12.5 micrometers, with a top thickness of 25 micrometers and a bottom thickness of 6 to 8 micrometers. This is more than three times the thickness of a diaphragm made of traditional polyester film, and its stiffness and elastic modulus are several tens of times greater. The voice coil layer 32 is electrolytic copper laminated to the surface of the PI film, and the electrolytic copper is etched to form the voice coil layer.

[0044] Furthermore, in some embodiments of the present invention, the diaphragm assembly 30 further includes an oxidation-resistant coating sprayed onto the surface of the electrolytic copper of the voice coil layer 32. Applying a layer of ink, soft rubber, or a similar material to the surface of the electrolytic copper of the voice coil layer 32 effectively prevents oxidation of the electrolytic copper on the voice coil layer 32 and prevents distortions that occur in the diaphragm assembly 30 during vibration. These distortions include the "buzzing" noise caused by vibrating or rubbing a piece of paper, high-frequency harmonic distortions that occur when the diaphragm assembly 30 vibrates in a divided manner, and a "whoosh" sound that sounds like a burr in the high-frequency range.

[0045] In some embodiments of the present invention, the base layer 31 of the diaphragm assembly 30 is made of DuPont's standard PI "polyimide" film, rather than the traditional polyester film. The voice coil layer 32 is made of electrolytic copper, which is less susceptible to magnetism, and the surface of the electrolytic copper is sprayed with ink, soft rubber, or similar material for anti-oxidation and noise reduction. This overcomes the diaphragm assembly's deficiencies, such as poor toughness, low stiffness modulus, and insufficient resilience. It also eliminates distortion during high-power operation, providing ample mid- and low-frequency volume with rich detail and roundness. The electrolytic copper voice coil layer reduces inductive reactance, favoring power amplifier drive and high-frequency extension. The sprayed ink, soft rubber, or similar material on its surface further increases the diaphragm assembly's deficiency, reduces split vibration, and eliminates high-frequency burrs.

[0046] 3 and 5, in some embodiments of the present invention, the diaphragm assembly 30 further includes a suspension frame 33. It should be noted that, in addition to traditional dome loudspeaker treble, midrange, or conical speaker units, traditional flat diaphragm treble, midrange, or earphone speaker units do not have a suspension frame. The suspension frame, also called an "edge," is a flexible suspension member connecting a vibrating member such as a diaphragm or diaphragm to a fixed part such as a frame or speaker box wall, and is usually made of a material such as rubber, hence the name "rubber edge." The suspension frame 33 is arranged around the edge of the base layer 31, which is connected to the frame 10 by the suspension frame 33. In some embodiments of the present invention, the main purpose of adding and installing the suspension frame 33 is to apply a certain tension to the diaphragm assembly, allowing it to be fully tensioned or elastically adjusted so that it can be laid flatly over the opening at one end of the receiving cavity 11 in the frame 10. The suspension frame 33 is made of elastic colloid, which, in addition to allowing the tension or elasticity of the diaphragm assembly 30 to be adjusted, also effectively overcomes the defects of the diaphragm assembly 30, such as poor toughness, low rigidity, and insufficient recovery force, and also produces no mid- to low-frequency distortion during high-power operation, providing sufficient mid- to low-frequency volume with rich detail and roundness.

[0047] Another aspect of the present invention further provides a speaker, which may be a treble or midrange speaker in a speaker system. Importantly, it is a speaker unit capable of emitting a plane wave, which can also be used in earphone product design as an earphone speaker. In either application, the planar transducer 1 according to any of the above-described embodiments is provided, which can effectively reduce sound distortion, flatten the frequency curve, and effectively improve the sound quality of such speakers. However, all embodiments of the present invention belong to the core of the unit itself. When specifically applied to a treble speaker unit, a midrange speaker unit, or an earphone speaker unit, it must be tailored to the specific circumstances and structure of each application. For example, to install a treble speaker unit and a midrange speaker unit in a dedicated speaker case, the earphone speaker unit must be installed in the earphone case.

[0048] The above are merely preferred specific embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought up by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be in accordance with the scope of protection of the claims. [Explanation of symbols]

[0049] 1: planar transducer, 10: frame, 11: accommodating chamber, 12: first mounting seat, 13: second mounting seat, 20: magnetic circuit assembly, 21: magnetic conductive plate, 211: main plate portion, 212: side plate portion, 213: protrusion portion, 214: recess portion, 22: magnet assembly, 221: first magnet, 222: second magnet, 30: diaphragm assembly, 31: base layer, 32: voice coil layer, 33: suspension frame, 40: cover plate, 41: first sound hole.

Claims

1. A planar transducer, a frame having an internal storage chamber and an opening at one end of the storage chamber; a magnetic circuit assembly provided in the accommodating chamber, the magnetic circuit assembly including a magnetic permeable plate and a magnet assembly attached to a surface of the magnetic permeable plate, the magnet assembly including N first magnets and N-1 second magnets, where N is 3 or more, the first magnets and the second magnets are attached alternately in order, the magnetic pole directions of the first magnets and the magnetic pole directions of the second magnets are perpendicular to each other, and the magnetic circuit assembly is configured such that any two adjacent magnets in the magnet assembly are spaced apart from the other type of magnets and have magnetic pole directions opposite to each other; a diaphragm assembly including a base layer and a voice coil layer, the base layer being disposed to cover the opening of the accommodating chamber, the voice coil layer being attached to and connected to one side of the base layer, and the other side of the base layer being disposed toward the magnetic circuit assembly; a cover plate provided to cover an opening of the accommodating chamber, facing the voice coil layer, and having a first sound outlet provided in the cover plate.

2. 2. A planar transducer as described in claim 1, characterized in that the direction of the magnetic field lines of the first magnet is parallel to the plate surface of the magnetic permeable plate and the direction of the magnetic field lines of the second magnet is perpendicular to the plate surface of the magnetic permeable plate, or the direction of the magnetic field lines of the first magnet is perpendicular to the plate surface of the magnetic permeable plate and the direction of the magnetic field lines of the second magnet is parallel to the plate surface of the magnetic permeable plate.

3. 2. The planar transducer of claim 1, wherein any of the first magnets and the second magnets installed adjacent to each other are arranged alternately in a concave-convex pattern toward one end face of the magnetic permeable plate, and any of the first magnets and the second magnets installed adjacent to each other are arranged in a line away from the other end face of the magnetic permeable plate.

4. 2. The planar transducer according to claim 1, wherein the height dimension of the first magnet is smaller than the height dimension of the second magnet in a direction perpendicular to the plate surface of the magnetic conductive plate, and the cross-sectional area of ​​the first magnet is smaller than the cross-sectional area of ​​the second magnet.

5. 2. The planar transducer according to claim 1, wherein the width dimension of the first magnet is smaller than the width dimension of the second magnet in a direction parallel to the plate surface of the magnetic conductive plate, and the cross-sectional area of ​​the first magnet is smaller than the cross-sectional area of ​​the second magnet.

6. 2. The planar transducer of claim 1, wherein the magnetically conductive plate includes a main plate portion and side plate portions provided on both sides of the main plate portion, the main plate portion and the side plate portions on both sides are surrounded by a U-shaped structure, and the plurality of magnets are provided within the U-shaped structure and attached to the plate surface of the main plate portion.

7. 2. The planar transducer according to claim 1, wherein the base layer and the voice coil layer of the vibrating membrane assembly are an integral structure, the base layer is a PI film, the voice coil layer is electrolytic copper bonded to the surface of the PI film, and the electrolytic copper forms the voice coil layer by etching.

8. 8. The planar transducer of claim 7, wherein the vibrating membrane assembly further includes an anti-oxidation coating, the anti-oxidation coating being coated on a surface of the electrolytic copper of the voice coil layer.

9. 2. The planar transducer of claim 1, wherein the vibrating membrane assembly further includes a hanging frame, the hanging frame being arranged around an edge of the base layer, and the base layer being connected to the frame by the hanging frame.

10. A loudspeaker comprising a planar transducer according to any one of claims 1 to 9.

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