Planar Transducer and Speaker

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 belongs to the technical field of speakers, and specifically relates to a planar transducer and a speaker including this planar transducer.

Background Art

[0002] With the rapid development of electroacoustic products, people's requirements for sound quality are getting higher and higher. To make the speaker have good sound performance, high resolution, good efficiency, and low distortion, innovation and improvement are necessary. For high-frequency speaker units, mid-frequency speaker units, or earphone speaker units, the traditional dome, that is, the model of the moving coil speaker unit, can no longer meet the requirements of modern users and the market. The adoption of planar speaker units has become a new standard for more manufacturers to launch.

[0003] Currently, in the current technology, the magnetic energy of the planar transducer is relatively low, and the sound quality of the planar transducer cannot meet the requirements of many consumers. In the conventional planar speaker unit, in order to increase the magnetic energy, usually the method of increasing the number of magnets is adopted, and it is necessary to install two times, that is, two sets of magnetic stripes on the front and back surfaces of the planar diaphragm respectively. As a result, the sound radiated directly from the surface of the diaphragm to the ear is blocked by the magnetic stripes and forms shielding and interference during transmission, thereby affecting the sound radiation effect and degrading the sound quality.

[0004] In addition, traditional planar diaphragm materials use an ultra-thin nanoscale polyester film as the base layer. After applying a single layer of aluminum foil on it under negative pressure, circuits are formed by etching, and finally a planar circuit voice coil is formed. The most important reason for using this material is to minimize the mass of the diaphragm per unit area and obtain higher sound pressure levels, high-frequency ductility, and analytical power. Although many brands are proud of it, polyester films like this wrap have defects such as poor toughness, low stiffness, and insufficient resilience, which result in a decline in the quality of the diaphragm and high sound fidelity. First, the sound is thin, lacking in weight, and without enough roundness. Second, it is because the mid-low frequencies are distorted when the diaphragm is thin and under high power. Third, by etching the high-frequency region of the aluminum voice coil, it is to express a sharp baritone in the sound quality.

Summary of the Invention

[0005] An object of the present invention is to at least solve problems such as the quality decline caused by the sound emitted from the planar transducer being obstructed and interfered by the magnetic strip during transmission and the distortion caused by the planar diaphragm assembly. This object is achieved by the following technical solutions.

[0006] The planar transducer provided by the first aspect of the present invention has a housing chamber provided inside, a frame having an opening at one end of the housing chamber, and a magnetic circuit assembly provided in the housing chamber and including a magnetic conductive plate and a magnet assembly attached to the plate surface of 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 the same type of magnets arranged at intervals with any two adjacent to each other and spaced from other types of magnets are installed in opposite directions. It also includes a base layer and a voice coil layer. The base layer is provided to cover the opening of the housing chamber, the voice coil layer is attached and connected to one side of the base layer, and a diaphragm assembly provided on the other side of the base layer facing the magnetic circuit assembly, and a cover plate provided to cover the opening of the housing chamber, provided opposite to the voice coil layer, and the cover plate is provided with a first sound outlet.

[0007] According to the planar transducer of the present invention, a plurality of first magnets and a plurality of second magnets are sequentially and alternately closely attached and installed, the magnetic pole directions of the first magnets and the second magnets are made perpendicular to each other, and the magnetic pole directions of the same magnets arranged at intervals with any two of the plurality of magnets are installed in opposite directions, so that the plurality of magnets are installed according to the Halbach array, effectively improving the magnetic flux of the magnetic circuit assembly and further improving the sensitivity of the planar transducer. At the same time, the voice coil layer of the diaphragm assembly is placed on one side surface of the base layer, and the magnetic circuit assembly is placed on the other side surface of the base layer. When the planar transducer vibrates and emits sound, the diaphragm assembly vibrates and emits sound under the magnetic field action of the magnetic circuit assembly, and the sound is transmitted from the side of the base layer where the voice coil layer is provided to the outside of the frame without being shielded or interfered with by the magnets during the transmission of the sound, thereby reducing the distortion of the sound, making the frequency curve flatter, and further effectively improving the sound quality of the planar transducer.

[0008] Also, according to the planar transducer of the present invention, it can also 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 conductive plate, the direction of the magnetic field lines of the second magnet is perpendicular to the plate surface of the magnetic conductive plate, or the direction of the magnetic field lines of the first magnet is perpendicular to the plate surface of the magnetic conductive plate, and the direction of the magnetic field lines of the second magnet is parallel to the plate surface of the magnetic conductive plate.

[0010] In some embodiments of the present invention, any adjacent first magnet and second magnet are alternately arranged in a concave-convex shape toward one end face of the magnetic conductive plate, and any adjacent first magnet and second magnet are provided in alignment away from the other end face of the magnetic conductive plate.

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

[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 magnetic 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 a plurality of the magnets are provided within the U-shaped structure and adhered 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 of an integral structure, the base layer is a PI film, the voice coil layer is electrolytic copper adhered to the surface of the PI film, and the electrolytic copper forms the voice coil layer by etching.

[0015] In some embodiments of the present invention, the diaphragm assembly further includes an antioxidant coating, and the antioxidant coating is coated on the surface of the electrolytic copper of the voice coil layer.

[0016] In some embodiments of the present invention, the diaphragm assembly further includes a suspension frame, the suspension frame is provided around the edge of the base layer, and the base layer is connected to the frame by the suspension frame.

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

Brief Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and merits will become apparent to those skilled in the art. The drawings are only used for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. And throughout the drawings, the same parts are denoted by the same reference numerals.

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Mode for Carrying Out the Invention

[0019] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms without being limited to the embodiments described in this specification. Conversely, providing these embodiments is for the purpose of enabling a better understanding of the present invention and fully communicating the scope of the present invention to those skilled in the art.

[0020] It should be understood that the terms used in this specification are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless specifically stated otherwise in this specification, the singular forms "a", "an", and "the" as used in this specification can also represent the plural form. The terms "comprising", "containing", "including", and "having" are inclusive and indicate the presence of the 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 in this specification are not to be construed as necessarily being executed in the specific order described or illustrated unless the execution order is explicitly indicated. It should also be understood that additional or alternative steps can be used.

[0021] Multiple components, members, regions, layers, and / or sections can be described using terms such as first, second, third, etc., but these components, members, regions, layers, and / or sections should not be limited by these terms. These terms can only be used to separate one component, member, region, layer, or segment from another region, layer, or segment. Terms such as "first", "second", etc., and other numerical terms, when used in this specification, do not imply an order or sequence unless explicitly indicated in the specification. Thus, the first component, member, region, layer, or segment described below can be referred to as the second component, member, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0022] For ease of explanation, in this specification, terms of relative spatial relationship can be used to describe the relationship of one relationship or feature as shown in the drawings with respect to another component or feature, such as "inside", "outside", "inner", "outer", "below", "downward", "above", "upward", etc. Such terms of relative spatial relationship are meant to include different orientations of the device in uses or operations other than the orientation shown in the drawings. For example, if the device in the drawing is inverted, a component described as "below" or "downward of another component or feature" will be oriented "above" or "upward of another component or feature". Thus, examples of the term "below..." can include the orientations of above and below. The device can be rotated 90 degrees or in other directions, and accordingly, the descriptions of relative spatial relationship used in this specification can be interpreted.

[0023] Referring to FIGS. 1 to 9, in some embodiments of the present invention, the planar transducer 1 includes a frame 10, a magnetic circuit assembly 20, a diaphragm assembly 30, and a cover plate 40. Specifically, an accommodation chamber 11 is provided inside the frame 10, the magnetic circuit assembly 20 is provided in the accommodation chamber 11, and by covering the diaphragm assembly 30 at the opening of one end of the accommodation chamber 11, a magnetic circuit is formed inside the accommodation chamber 11, and the diaphragm assembly 30 at the opening of the accommodation chamber 11 is excited to vibrate to generate acoustic energy. The magnetic circuit assembly 20 of the present embodiment includes a magnetic conductive plate 21 and a magnet assembly 22 provided by being bonded to the plate surface of the magnetic conductive plate 21. The magnet assembly 22 includes 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 are sequentially and alternately bonded and installed without a gap between them. The magnetic pole directions of the first magnets 221 and the second magnets 222 are perpendicular to each other, and in the magnet assembly 22, the magnetic pole directions of any two adjacent magnets of the same type arranged at an interval from other types of magnets are installed in opposite directions. The diaphragm assembly 30 includes a base layer 31 and a voice coil layer 32. The base layer 31 is provided to cover the opening of the accommodation chamber 11, the voice coil layer 32 is connected by being bonded to one side of the base layer 31, and the other side of the base layer 31 is installed facing the magnetic circuit assembly 20. Similarly, the cover plate 40 is provided to cover the opening of one end of the accommodation chamber 11 and is provided opposite to 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 diaphragm assembly 30 are placed in the case structure formed by the cover plate 40 and the frame 10 to facilitate the assembly and sound generation of the planar transducer 1. The cover plate 40 is provided with a plurality of first sound holes 41, and when the diaphragm assembly 30 vibrates, the sound generated from the front can be transmitted by 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 bonded and installed, and the magnetic pole directions of the first magnets 221 and the second magnets 222 are perpendicular to each other. Among the plurality of magnets, any two are adjacent and arranged at intervals from other types of magnets in the opposite direction to the magnetic pole directions of the same type of magnets. By arranging the plurality of magnets according to the Halbach array, the magnetic flux of the magnetic circuit assembly 20 is effectively improved, and the sensitivity of the planar speaker is further improved. At the same time, the voice coil layer 32 is placed on one side surface of the base layer 31, and the magnetic circuit assembly 22 is placed on the other side surface of the base layer 31. When the planar transducer 1 vibrates and emits sound, the vibration membrane assembly 30 vibrates and emits sound under the magnetic field action of the magnetic circuit assembly 20, and the sound is transmitted from the side surface of the base layer 31 where the voice coil layer 32 is provided to the outside of the frame 10. During the transmission of the sound, it is not shielded and interfered by the magnets, thereby reducing the distortion of the sound, making the frequency curve flatter, and further effectively improving the sound quality of the planar transducer 1.

[0025] Specifically, referring to FIGS. 1 to 4, in some embodiments of the present invention, a housing chamber 11 for mounting the magnetic circuit assembly 20 is formed inside the frame 10. In the housing chamber 11, a first mounting seat 12 and a second mounting seat 13 are provided at intervals in the length direction, and both ends of the magnetic circuit assembly 20 in the length direction are respectively fixed and connected to the first mounting seat 12 and the second mounting seat 13. The specific connection method may be bolt connection.

[0026] Referring to FIGS. 6 to 8, in some embodiments of the present invention, the magnetic circuit assembly 20 includes a magnetic conductive plate 21 and a magnet assembly 22 provided by being bonded to the plate surface of the magnetic conductive plate 21. Among them, the magnet assembly 22 includes nine first magnets 221 and eight second magnets 222. The first magnets 221 and the second magnets 222 are sequentially and alternately bonded and installed. Specifically, the first magnets 221 and the second magnets 222 are connected by adhesion to form the magnet assembly 22 and facilitate the connection with the magnetic conductive plate 21. Among them, the magnetic field line direction of the first magnet 221 is parallel to the plate surface of the magnetic conductive plate 21, and the magnetic field line direction of the second magnet 222 is perpendicular to the plate surface of the magnetic conductive plate 21. And in the magnet assembly 22, the magnetic pole directions of any two adjacent magnets of the same type arranged at intervals from other types of magnets are arranged in opposite directions, that is, the magnetic pole directions of the two second magnets 222 located on both sides of the same first magnet 221 are arranged in opposite directions, or the magnetic pole directions of the two first magnets 221 located on both sides of the same second magnet 222 are arranged in opposite directions. For the sake of explanation, the magnetic field line directions are respectively indicated by "↑", "↓", "←", "→", and the direction pointed by the arrow represents the direction of the N pole. According to the number of magnets, they can be distributed as follows from the smallest to the largest.

[0027] When the number of magnets in the magnet assembly 22 is five, that is, it includes 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, it includes 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, it includes 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, it includes 6 first magnets 221 and 5 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, when the dimensions and quality are acceptable, the Halbach array can continue to expand according to demand.

[0033] From the above arrangement methods of the first magnets 221 and the second magnets 222, it can be seen that the magnet assembly 22 of this embodiment is distributed according to the Halbach array. Since the Halbach array can greatly increase the magnetic force of the planar magnetic field, by simply providing one set of the Halbach array on one side of the diaphragm assembly 30, a high-density magnetic field can be achieved. Furthermore, there is no magnet installed in the sound-emitting direction of the diaphragm assembly 30, which can reduce or avoid the shielding and interference that the sound receives during the transmission process, greatly reduce the distortion of the sound, and make the frequency curve flatter.

[0034] The "Halbach Array" is a permanent magnet arrangement method in which permanent magnets with different magnetization directions are arranged in a certain order, significantly enhancing the magnetic field on one side of the array. The invention of this distribution method belongs to the American Highalbeck who "filed a patent application in 1979". However, the present invention integrates and improves it and applies it for the first time in the field of speakers.

[0035] As shown in FIG. 8, different from the Halbach array, in some embodiments of the present invention, in the direction perpendicular to the plate surface of the magnetic conductive plate 21, the height dimension of the first magnet 221 of 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, different from the Halbach array, in some embodiments of the present invention, in a direction parallel to the plate surface of the magnetic conductive plate 21, the width dimension of the first magnet 221 of the present 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, different from the Halbach array, in some embodiments of the present invention, any adjacent first magnet 221 and second magnet 222 are arranged aligned toward the surface of the base layer 31, and any adjacent first magnet 221 and second magnet 222 are alternately arranged in a concave-convex shape toward the surface of the magnetic conductive plate 21, facilitating the assembly and fixation of the first magnet 221 and the second magnet 222 and the magnetic conductive plate 21.

[0038] Referring to FIGS. 6 and 7, different from the Halbach array, in some embodiments of the present invention, in order to match the installation of the first magnet 221 and the second magnet 222, a magnetic conductive plate 21 is added based on the Halbach array. The magnetic conductive plate 21 includes a main board portion 211 and side board portions 212 provided on both sides of the main board portion 211. The main board portion 211 and the side board portions 212 on both sides are surrounded by a U-shaped structure. A plurality of first magnets 221 and a plurality of second magnets 222 are both provided within the U-shaped structure and are bonded to the plate surface of the main board portion 211.

[0039] Specifically, on the board surface facing the magnet assembly 22 of the main board portion 211, N protrusions 213 and N - 1 recesses 214 are provided. Among them, the number of protrusions 213 is the same as the number of the first magnets 221, the number of recesses 214 is the same as the number of the second magnets 222, and the arrangement pattern of the N protrusions 213 and the N - 1 recesses 214 is the same as the arrangement pattern of the N first magnets 221 and the N - 1 second magnets 222. The height dimension difference between the protrusion 213 and the recess 214 is the same as the height dimension difference between the first magnet 221 and the second magnet 222, and the width dimension of the protrusion 213 is the same as the width dimension of the first magnet 221, and the width dimension of the recess 214 is the same as the width dimension of the second magnet 222. Thus, when the magnet assembly 22 and the magnetic conductive plate 21 are assembled, the second magnet 222 can be locked between two protrusions 213 and be in contact with the recess 214, and the protrusion 213 can be locked between two second magnets 222 and be in contact with the first magnet 221. Thereby, a seamless connection between the magnet assembly 22 and the magnetic conductive plate 21 is realized, ensuring that the magnetic circuit assembly 20 has the maximum magnetic flux. Among them, the side plate portions 212 provided on both sides of the main board portion 221 surround the magnet assembly 22 and further prevent the diffusion of the magnetic field and magnetic leakage of the magnet assembly 22.

[0040] Different from the traditional Halbach array, the magnet assembly 22 of this embodiment is improved based on the previous Halbach array. First, all the cross-sectional dimensions of the magnets in the previous Halbach array are the same, but in the magnetic circuit assembly 20 of this embodiment, the cross-sectional area of the magnet whose magnetic force lines are in the horizontal directions “← and →” is reduced, that is, the cross-sectional area of the first magnet 221 is reduced, making it easier to reduce the horizontal distance between two adjacent second magnets 222, reduce the magnetic gap between the two second magnets 222, further enhance the magnetic force in the magnetic gap, and also making the assembly of the magnetic circuit assembly 20 easier and able to reduce costs. Second, the magnetic circuit assembly 20 of this embodiment adds and attaches a magnetic conductive plate 21 around the magnets in the previous Halbach array. The installation of the magnetic conductive plate 21 can further improve the magnetic flux of the magnetic circuit assembly 20, prevent the diffusion of the magnetic field and magnetic leakage, and make it easier to assemble and fix the magnet assembly 22.

[0041] The greatest advantage of the magnetic circuit assembly 20 of this embodiment is the improvement in the surface magnetic flux of the planar magnetic field. Assuming that the magnetic circuit is composed of neodymium iron boron ferromagnetic materials both labeled N50, the surface magnetic flux of a magnetic field such as a traditional plane is generally about 3000G - 4000G (where "G" is the unit of gauss). The surface magnetic flux of the previous Halbach array can reach about 5000G - 6000G, and the Halbach array with an additional U-shaped magnetic conductive plate attached can reach about 6000G - 7000G or more, which can significantly increase the magnetic flux of the planar magnetic field. Therefore, by using an improved magnetic circuit that can achieve a magnetic flux more than about twice that of such a normal planar magnetic field, its sensitivity and efficiency are also improved by more than twice. Therefore, simply providing one set of the magnetic circuit assembly 20 of this embodiment on one side of the diaphragm assembly 30 can outperform the traditional magnetic circuits provided on both sides of two traditional diaphragms respectively. Moreover, there is no shielding of the magnet in the sound-emitting direction of the diaphragm assembly 30, and the sound emitted by the diaphragm assembly 30 is not shielded and interfered during transmission, which can reduce distortion and make the frequency curve flatter.

[0042] Traditional planar diaphragm materials use ultra-thin nanoscale polyester film as the base layer. After laminating one piece of aluminum foil under negative pressure, a circuit is formed by etching, and finally a planar circuit voice coil is formed. The most important reason for using this material is to make the mass of the diaphragm the lightest per unit area and to obtain higher sound pressure levels and high-frequency ductility and resolution. Although many brands are proud of it, such polyester films like this wrap have defects such as poor toughness, low rigidity modulus, and insufficient resilience, which reduce the quality of the diaphragm and the high faithfulness of the sound. First, the sound is thin, lacks a sense of weight, and is not round enough. Second, it is because the mid-low frequencies are distorted when the diaphragm is thin and under high power. Third, by etching the high-frequency region of the aluminum voice coil, it shows a sharp and harsh feeling in the sound quality.

[0043] As shown in FIG. 9, in some embodiments of the present invention, the base layer 31 and the voice coil layer 32 are of an integral structure. The base layer 31 is a DuPont-standard PI film with a micron-level thickness, that is, the median thickness is about 12.5 micrometers, 25 micrometers from the top and 6 - 8 micrometers from the bottom, which is more than three times the thickness of the diaphragm using traditional polyester film, and its rigid modulus of elasticity reaches several tens of times more. The voice coil layer 32 is electrolytic copper provided by laminating on the surface of the PI film, and the electrolytic copper forms the voice coil layer by etching.

[0044] Furthermore, in some embodiments of the present invention, the diaphragm assembly 30 further includes an anti-oxidation coating sprayed on the surface of the electrolytic copper of the voice coil layer 32. By applying a layer of ink, soft rubber or similar material on the surface of the electrolytic copper of the voice coil layer 32, firstly, the oxidation of the electrolytic copper on the voice coil layer 32 can be effectively prevented, and secondly, the distortion generated by the diaphragm assembly 30 during vibration can be prevented. These distortions include the "rustling" noise generated by vibrating or kneading a piece of paper, the high-frequency harmonic distortion generated during the split vibration of the diaphragm assembly 30, and the "shushing" sound like burrs generated in the high-frequency region.

[0045] In some embodiments of the present invention, the base layer 31 of the diaphragm assembly 30 abandons traditional polyester films and adopts DuPont standard PI "polyimide" films. The voice coil layer 32 abandons traditional aluminum foils and adopts electrolytic copper that is difficult to magnetize. Ink, soft rubber or similar materials are sprayed on the surface of the electrolytic copper to perform antioxidant and noise reduction treatments, thereby overcoming defects such as poor toughness, low rigidity modulus of elasticity, and insufficient resilience of the diaphragm assembly 30. Moreover, no distortion occurs during high-power operation, and the medium and low volume sense is sufficient, with rich details and roundness. The voice coil layer using electrolytic copper reduces inductive reactance, which is advantageous for the propulsion of the power amplifier and the extension of high frequencies. The ink, soft or similar materials sprayed on its surface also further increase the toughness of the diaphragm moassembly 30, reduce split vibration, and cover the high-frequency burr feeling.

[0046] Referring to FIGS. 3 and 5, in some embodiments of the present invention, the diaphragm assembly 30 further includes a suspension frame 33. In particular, in addition to the tweeter, midrange, or cone speaker unit of a traditional dome loudspeaker, such traditional planar diaphragm tweeters, midranges, or earphone speaker units do not have a suspension frame. The suspension frame, also called the "side" or "edge", is a suspension member for the flexible connection between vibrating members such as diaphragms and diaphragms and fixed parts such as frames and speaker box walls. Since it is usually made of materials such as rubber, it is called the "rubber side". The suspension frame 33 is provided around the edge of the base layer 31, and the base layer 31 is connected to the frame 10 by the suspension frame 33. In some embodiments of the present invention, the main purpose of adding and attaching the suspension frame 33 is to apply a certain tension to the diaphragm assembly, fully apply tension to the diaphragm assembly, or elastically adjust the diaphragm assembly, so that the diaphragm assembly is flatly laid on the opening at one end of the accommodation cavity 11 in the frame 10. The suspension frame 33 is made of elastic colloid. In addition to being able to tension or elastically adjust the diaphragm assembly 30, it can further effectively overcome defects such as poor toughness, low rigidity rate, and insufficient restoring force of the diaphragm assembly 30. Moreover, no mid-low frequency distortion occurs during high-power operation, the mid-low volume feeling is sufficient, the details are rich, and it is round.

[0047] Another aspect of the present invention further provides a speaker, which may be a tweeter unit or a midrange speaker unit in a speaker system. Importantly, it is a speaker unit that can emit a wavefront plane wave applicable to the design of earphone products as an earphone speaker unit. In any application, since it is equipped with the planar transducer 1 in any of the above-described embodiments, it can effectively reduce sound distortion, make the frequency curve flatter, and further effectively improve the sound quality of such a speaker. However, all embodiments of the present invention belong to the core part of the unit itself. When specifically applied to a tweeter unit, a midrange speaker unit, or an earphone speaker unit, it needs to be adjusted according to the specific situation and structure for each application. For example, when mounting the tweeter unit and the midrange speaker unit in a dedicated speaker case, it is necessary to mount the earphone speaker unit in an earphone case.

[0048] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Changes or substitutions that can be easily conceived by those skilled in the art within the disclosed technical scope of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should conform to the protection scope of the claims.

Description of Reference Numerals

[0049] 1: Planar transducer, 10: Frame, 11: Accommodation chamber, 12: First mounting seat, 13: Second mounting seat, 20: Magnetic circuit assembly, 21: Magnetic conductive plate, 211: Main board part, 212: Side plate part, 213: Protrusion part, 214: Recess part, 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, comprising: a housing chamber provided inside, a frame having an opening at one end of the housing chamber, and a magnetic circuit assembly provided in the housing chamber, including a magnetic conductive plate and a magnet assembly attached to the plate surface of the magnetic conductive 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 sequentially and alternately attached and installed, the magnetic pole directions of the first magnets and the magnetic pole directions of the second magnets are perpendicular to each other, and in the magnet assembly, the magnetic pole directions of the same type of magnets, where any two are adjacent and arranged at intervals from other types of magnets, are installed in opposite directions; a base layer and a voice coil layer, the base layer is provided to cover the opening of the housing chamber, the voice coil layer is attached and connected to one side of the base layer, and a diaphragm assembly provided on the other side of the base layer facing the magnetic circuit assembly; a cover plate provided to cover the opening of the housing chamber and provided opposite to the voice coil layer, the cover plate having a first sound outlet, characterized in that it is a planar transducer.

2. The magnetic field line direction of the first magnet is parallel to the plate surface of the magnetic conductive plate, the magnetic field line direction of the second magnet is perpendicular to the plate surface of the magnetic conductive plate, or the magnetic field line direction of the first magnet is perpendicular to the plate surface of the magnetic conductive plate, and the magnetic field line direction of the second magnet is parallel to the plate surface of the magnetic conductive plate, characterized in that it is the planar transducer according to Claim 1.

3. Any adjacent first magnet and second magnet are alternately arranged in a concave-convex shape toward one end face of the magnetic conductive plate, and any adjacent first magnet and second magnet are provided aligned away from the other end face of the magnetic conductive plate, characterized in that it is the planar transducer according to Claim 1.

4. In a direction perpendicular to the plate surface of the magnetic conductive plate, the height dimension of the first magnet is smaller than the height 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, characterized in that it is the planar transducer according to Claim 1.

5. 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, characterized in that it is the planar transducer according to Claim 1.

6. The magnetic conductive plate includes a main board portion and side plate portions provided on both sides of the main board portion. The main board portion and the side plate portions on both sides are surrounded by a U-shaped structure. A plurality of the magnets are provided in the U-shaped structure and are bonded to the plate surface of the main board portion. The planar transformer according to claim 1, characterized in that.

7. The base layer of the vibration membrane assembly and the voice coil layer are of an integral structure. The base layer is a PI film, and the voice coil layer is electrolytic copper provided by being bonded to the surface of the PI film. The electrolytic copper forms the voice coil layer by etching. The planar transformer according to claim 1, characterized in that.

8. The vibration membrane assembly further includes an antioxidant coating, and the antioxidant coating is coated on the surface of the electrolytic copper of the voice coil layer. The planar transformer according to claim 7, characterized in that.

9. The vibration membrane assembly further includes a suspension frame, and the suspension frame is provided around the edge of the base layer. The base layer is connected to the frame by the suspension frame. The planar transformer according to claim 1, characterized in that.

10. A speaker, characterized by including the planar transformer according to any one of claims 1 to 9.

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