阅读说明：本技术 一种无磁式扬声器 (Non-magnetic loudspeaker ) 是由 林和鼎 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种无磁式扬声器,包括：支架上盖、支架下盖、固定磁钢、平面音圈、鼓纸；支架上盖和支架下盖相扣合,固定磁钢为圆形,固定磁钢设有至少一个,固定磁钢设于支架上下盖上,鼓纸为圆形,鼓纸的截面呈弧形,鼓纸设于支架上盖与支架下盖扣合处,平面音圈设有至少一个,平面音圈设于鼓纸的内部并与鼓纸的内侧连接。采用以上设计,结构简单,设计合理,成本低,同时平面音圈和固定磁钢可根据实际使用需求自由设置参数及大小,两者之间互不影响,具有较大的应用推广价值,同时固定磁钢可更改为固定线圈,通过输入音频电流产生固定磁场作用于平面音圈上,进而实现无磁式扬声器。(The invention discloses a non-magnetic loudspeaker, comprising: the voice coil loudspeaker comprises a bracket upper cover, a bracket lower cover, fixed magnetic steel, a planar voice coil and drum paper; support upper cover and support lower cover looks lock, fixed magnet steel is circular, and fixed magnet steel is equipped with at least one, and fixed magnet steel is located and is covered on the support from top to bottom, and the drum paper is circular, and the cross-section of drum paper is the arc, and the drum paper is located support upper cover and support lower cover lock department, and the plane voice coil loudspeaker voice coil is equipped with at least one, and the inside of drum paper is located to the plane voice coil loudspeaker voice coil and is connected with the inboard of drum paper. Design more than adopting, simple structure, reasonable in design, it is with low costs, plane voice coil loudspeaker voice coil and fixed magnet steel can be according to the in-service use demand freedom setting parameter and size simultaneously, each other do not influence between the two, have great application promotion value, fixed magnet steel can change into fixed coil simultaneously, produces fixed magnetic field through input audio current and acts on the plane voice coil loudspeaker, and then realize no magnetic loudspeaker.)

1. A non-magnetic speaker, comprising: the voice coil loudspeaker comprises a bracket upper cover, a bracket lower cover, fixed magnetic steel, a planar voice coil and drum paper; the support upper cover with support lower cover looks lock, fixed magnet steel is circular, fixed magnet steel is equipped with at least one, fixed magnet steel is located cover on the support, the drum paper is circular, the cross-section of drum paper is the arc, the drum paper is located the support upper cover with support lower cover lock department, the plane voice coil loudspeaker voice coil is equipped with at least one, the plane voice coil loudspeaker voice coil is located the inside of drum paper and with the inboard of drum paper is connected.

2. The non-magnetic speaker of claim 1, wherein the planar voice coil comprises: PCB board, copper foil spiral ring; the PCB is double-sided, and a metallization hole is formed in the middle of the PCB; the copper foil spiral rings are arranged on the two sides of the PCB respectively, the copper foil spiral rings are wound from outside to inside, and one ends of the two sides of the PCB, including the copper foil spiral rings, are connected through the metalized holes.

3. The non-magnetic speaker of claim 1, wherein the metalized holes are filled with filler.

4. The non-magnetic speaker as claimed in claim 1, wherein the metallized holes of the planar voice coil are plugged with a filler, wherein the filler is glue or a hard plastic sheet to prevent sound transmission.

5. The non-magnetic speaker of claim 1, wherein the top and the sidewall of the top cover of the bracket are provided with sound holes.

6. The non-magnetic speaker as claimed in claim 1, wherein the bottom outer wall of the lower cover of the bracket is provided with an air outlet, and the air outlet is provided with a layer of sound absorbing paper.

7. The non-magnetic speaker of claim 1, wherein there are two fixed magnetic steels respectively disposed in the upper bracket cover and the lower bracket cover and corresponding to each other in the vertical direction, and magnetic forces between the two fixed magnetic steels repel each other.

8. The non-magnetic speaker of claim 7, wherein the fixed magnetic steel is an excitation coil.

Technical Field

The invention relates to the technical field of loudspeakers, in particular to a non-magnetic loudspeaker.

Background

Most of the existing loudspeakers are moving-coil loudspeakers, and the working principle of the existing loudspeakers is an electroacoustic transducer designed according to the physical phenomenon that a current carrier is acted by a magnetic field force in a magnetic field, and the electroacoustic transducer is generally called as a loudspeaker. The sounding size of the loudspeaker is in direct proportion to the current flowing in the voice coil and the intensity of the fixed magnetic field used by the loudspeaker, so that the sounding size of the loudspeaker is related to the winding diameter of the voice coil and the magnetic field of the fixed magnetic steel, the voice coil of the moving coil loudspeaker is formed by winding a circle of enameled wires into a cylinder, a magnetic seam for placing the voice coil is arranged on the fixed magnetic steel, the voice coil is electrified with audio current to generate interaction between the magnetic field and the magnetic field of the fixed magnetic steel, so that the voice coil reciprocates to drive drum paper to reciprocate and realize sounding, the magnetic field of the fixed magnetic steel in the loudspeaker is related to the size of the magnetic seam arranged on the voice coil, the larger the magnetic seam is, the smaller the magnetic seam is, and conversely, the larger the magnetic field is, so that the magnetic seam is required to be small and the small magnetic seam is required to fix the magnetic steel, so that the thickness of the cylinder is correspondingly reduced, the small diameter of the coil leads to small current and large resistance of the voice coil, which affects the use of the loudspeaker and is the root of the restriction on the further development of the moving coil loudspeaker. Under the condition, the research and development of people are stimulated, so that a moving-magnet type loudspeaker is developed, and the loudspeaker is different from a moving-coil type loudspeaker in that a voice coil reciprocates under the excitation of a magnetic field, and a fixed magnetic steel is fixed; the moving-magnet loudspeaker does reciprocating motion under the excitation of a magnetic field and is provided with magnetic steel, a coil is fixed, a voice coil and fixed magnetic steel are arranged at intervals instead of being embedded into a magnetic seam as a moving-coil loudspeaker, and the moving-magnet loudspeaker does not need to be provided with a magnetic seam in the traditional sense, so that the fixed magnetic steel magnetic field of the moving-magnet loudspeaker and the fixed magnetic steel magnetic field of the moving-coil loudspeaker are improved, and the sound production of the moving-magnet loudspeaker is larger than that of the moving-coil loudspeaker under the condition of the same numerical value of the two loudspeakers; as mentioned above, the sound volume of the speaker is not only proportional to the strength of the magnetic field of the fixed magnetic steel, but also proportional to the current flowing through the voice coil, the voice coil of the moving-magnet speaker is consistent with the voice coil of the moving-coil speaker in terms of manufacturing method, and is made into a cylindrical shape or a pancake shape on a plane by winding a circle of voice coil.

Therefore, there is a need to design a non-magnetic speaker to overcome the disadvantages of the prior art.

Disclosure of Invention

The technical scheme adopted by the invention to achieve the technical purpose is as follows: a non-magnetic speaker, comprising: the voice coil loudspeaker comprises a bracket upper cover, a bracket lower cover, fixed magnetic steel, a planar voice coil and drum paper; the support upper cover with support lower cover looks lock, fixed magnet steel is circular, fixed magnet steel is equipped with at least one, fixed magnet steel is located cover on the support, the drum paper is circular, the cross-section of drum paper is the arc, the drum paper is located the support upper cover with support lower cover lock department, the plane voice coil loudspeaker voice coil is equipped with at least one, the plane voice coil loudspeaker voice coil is located the inside of drum paper and with the inboard of drum paper is connected.

In a preferred embodiment, the planar voice coil comprises: PCB board, copper foil spiral ring; the PCB is double-sided, and a metallization hole is formed in the middle of the PCB; the copper foil spiral rings are arranged on the two sides of the PCB respectively, the copper foil spiral rings are wound from outside to inside, and one ends of the two sides of the PCB, including the copper foil spiral rings, are connected through the metalized holes.

In a preferred embodiment, the metallized holes are provided with a filler.

In a preferred embodiment, the filler is glue or a thin film of glue.

In a preferred embodiment, the top end and the side wall of the upper cover of the bracket are provided with a plurality of sound outlet holes.

In a preferred embodiment, a layer of sound absorption paper is arranged on the outer wall of the bottom of the bracket lower cover.

In a preferred embodiment, there are two fixed magnetic steels respectively disposed in the upper bracket cover and the lower bracket cover and corresponding to each other up and down, and magnetic forces between the two fixed magnetic steels repel each other.

In a preferred embodiment, the fixed magnetic steel is an excitation coil.

The invention has the beneficial effects that: the fixed magnetic steel is fixedly arranged on the upper cover of the bracket, the drum paper is arranged between the upper cover of the bracket and the lower cover of the bracket, the planar voice coil is arranged in the drum paper, and the planar voice coil is input with audio current to generate a magnetic field to interact with the magnetic field of the fixed magnetic steel, so that the planar voice coil is pushed to move up and down by a piston to push air to generate sound.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic structural diagram of a first side of a PCB board according to the present invention;

FIG. 3 is a schematic structural diagram of a second side of a PCB board according to the present invention;

FIG. 4 is a schematic structural diagram of the fixed magnetic steel of the present invention;

fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

In the figure:

1. a housing; 11. an upper cover of the bracket; 111. a sound outlet hole; 112. damping paper; 12. a bracket lower cover; 13. A planar voice coil; 131. a PCB board; 132. a copper foil spiral ring; 133. metallizing the hole; 14. drum paper; 15. Fixing the magnetic steel; 151. and (4) magnetic holes.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1 to 4, the present invention provides a nonmagnetic speaker, comprising: the device comprises a bracket upper cover 11, a bracket lower cover 12, fixed magnetic steel 15, a voice coil 13 and drum paper 14; support upper cover 11 with support lower cover 12 looks lock forms inside casing 1 that has the chamber that holds, fixed magnet steel 15 is circular, fixed magnet steel 15 is equipped with at least one, fixed magnet steel 15 is circular as an organic whole, fixed magnet steel 15 locates on the support upper cover 11, with support upper cover 11 fixed connection, drum paper 14 is ring shape, the cross-section of drum paper 14 is the arc, drum paper 14 locates support upper cover 11 with support lower cover 12 lock department, wherein drum paper 14 can set up in support upper cover 11 or support lower cover 12's opening part, plane voice coil 13 is equipped with at least one, plane voice coil 13 locate the inside of drum paper 14 and with the inboard of drum paper 14 is connected, and the use makes plane voice coil 13 produce and audio current frequency unanimous through letting in audio current for plane voice coil 13, The size is the magnetic field of unanimity also, and magnetic field and the 15 magnetic field interactions of the fixed magnet steel of support upper cover 11 produce magnetic attraction or magnetic repulsion this moment, and because of fixed magnet steel 15 is fixed with support upper cover 11, fixed magnet steel is immovable, and voice coil loudspeaker voice coil 13 is connected with drum paper 14, and voice coil loudspeaker voice coil 13 makes voice coil loudspeaker voice coil 13 make upper and lower piston motion under the effort in magnetic field under the arc structure of drum paper 14 to promote the air vibration and form the sound that the people's ear heard.

It can be understood, through fixed set up fixed magnet steel 15 on support upper cover 11, and set up drum paper 14 between support upper cover 11 and support lower cover 12, set up plane voice coil loudspeaker voice coil 13 in the drum paper 14, through to plane voice coil loudspeaker voice coil 13 input audio current, make plane voice coil loudspeaker voice coil 13 produce the magnetic field and act on with the magnetic field of fixed magnet steel 15, and then promote plane voice coil loudspeaker voice coil 13 and do the up-and-down piston motion, it produces sound to promote air, reasonable in design, moreover, the steam generator is simple in structure, low in cost, be convenient for mass production, plane voice coil loudspeaker voice coil 13 and fixed magnet steel 15 can freely set up the parameter according to the in-service use demand simultaneously, each other does not influence between the two, great application and popularization value has.

Further, the planar voice coil 13 includes: a PCB 131, the PCB 131 being double-sided, copper foil spiral rings 132 being printed on both sides of the PCB 131 by etching process, respectively, and a metallized hole 133 being formed in the center of the PCB 131, wherein the copper foil spiral rings 132 of both sides (hereinafter referred to as a first side and a second side for ease of understanding) are spirally wound from the metallized hole 133 toward the center to form a coil, and ends (hereinafter referred to as "ends B") of the copper foil spiral rings 132 of the first side and the second side at the center are connected together by the metallized hole 133, so that when an audio current is applied from the first side of the PCB 131, the audio current flows into the end B from the end (hereinafter referred to as "end A") of the copper foil spiral ring 132 of the first side away from the center, and flows out from the end A of the second side by flowing from the end B of the first side through the end of the second side, so that the current flows in the same direction regardless of the first side and the second side, thus, an audio magnetic field similar to a wire-wound voice coil is formed, the audio magnetic field has the same efficiency as a common coil, and in the mode, due to the mature of the technology, the PCB 131 can be made into a sheet shape with smaller thickness and smaller diameter, the process is simple, the product can be produced in batches by using automatic equipment, the copper foil spiral ring 132 on the audio magnetic field can be set to be large according to the actual use requirement so as to allow the required current to pass, meanwhile, the fixed magnetic steel 15 is made of neodymium iron boron alloy materials, the magnetic energy product of the magnet is larger than that of samarium cobalt magnets, aluminum nickel cobalt magnets and ferrite magnets, and is the material with the largest magnetic energy product density all over the world at that time, so that the magnetic part can have larger magnetism even if the size is smaller, and can be cut to the thickness of 0.5mm or below in the process, so that the thickness of the audio magnetic field is thinner and the weight of the audio magnetic field is lighter.

It should be noted that, because the coils of a single planar voice coil 13 are two layers, when two layers of coils cannot meet the use requirement, resulting in a small sound of the speaker, a plurality of planar voice coils 13 may be stacked, and two adjacent planar voice coils 13 are separated by an insulating plate, so as to increase the number of coil layers formed by the copper foil spiral ring 132 of the planar voice coil 13, and further improve the frequency response of the speaker.

Further, in this embodiment, because the plated-through hole 133 is formed in the PCB 131 for electrically connecting the copper foil spiral rings 132 on the first surface and the second surface together, when the PCB 131 moves up and down, the plated-through hole 133 is open through the copper foil spiral rings on the first surface and the second surface, when the PCB 131 moves, a sound leakage situation may occur, which affects the sound quality of the speaker, and in order to avoid the situation, after the plated-through hole 133 in the PCB 131 electrically connects the copper foil spiral rings on the first surface and the second surface, the sound on the two surfaces of the PCB 131 is separated by filling a filler (not shown in the figure), which prevents the sound on the back surface from being transmitted to the front surface, and prevents sound waves with opposite phases on the two surfaces from mixing when the drum paper 14 vibrates up and down, which affects the sound quality of the speaker.

Furthermore, the filler of the air holes of the lower cover of the support can be sponge or thick non-woven fabric, the filler made of the two materials is light in weight, the motion frequency of the planar voice coil cannot be influenced, and meanwhile, the filler can also play a role in noise elimination and improve the frequency response of the loudspeaker.

It should be noted that the small filler in the center hole of the planar voice coil may also be a glue.

Further, in this embodiment, fixed magnet steel 15 can set up to two, on support upper cover 11 and support lower cover 12, set up one respectively, correspond each other from top to bottom between two fixed magnet steel 15, and the magnetic field polarity between two fixed magnet steel 15 repels each other, through the quantity that increases fixed magnet steel 15 to increase fixed magnet steel 15's thickness, the reinforcing acts on the magnetic field on plane voice coil 13, promotes the power sensitivity of speaker.

Further, in the present embodiment, a plurality of sound emitting holes 111 are respectively formed on the top end and the side wall of the bracket upper cover 11, for transmitting the sound through the sound emitting holes 111.

Further, in this embodiment, a layer of sound absorbing paper 112 is disposed on the outer wall of the bottom of the bracket lower cover 12 for filtering the sound transmitted from the bracket lower cover 12.

It should be noted that, the outgoing line of the voice coil 13 of the present invention is a special K line for a loudspeaker or a copper foil (not shown in the figure), the copper foil of the first surface is adhered to the end a of the first surface through a conductive adhesive, the copper foil of the second surface is adhered to the end a of the second surface through a conductive adhesive, and the other end of the copper foil is led out of the housing 1 and is clamped and fixed by the upper bracket cover 11 and the lower bracket cover 12, so as to be conveniently connected with the outside.

It should be noted that, in this embodiment, the bracket upper cover 11 may be omitted, the PCB 131 is disposed on the bracket lower cover 12, and the fixing magnetic steel 15 or the excitation coil is disposed in the bottom of the bracket lower cover 12, wherein the air outlet 111 is disposed on the bottom end and the side wall of the bracket lower cover 12.

The present invention also provides a second embodiment, as shown in fig. 5, by changing the fixed magnetic steel 15 originally provided on the upper and lower support covers 11 and 12 into an excitation coil, the excitation coil can provide a fixed magnetic field for the planar voice coil 13. Or the coil wire is wound into a pie-shaped coil or a columnar wire-wound coil, when in use, the audio current is divided into two paths, one path of the audio current is rectified and then led to the excitation coil positioned at the upper position and the lower position, the other path of the audio current is led to the planar voice coil positioned at the middle part, wherein the audio current led to the excitation coils and the 13 forms pulsating direct current through bridge rectification, the current direction of the pulsating direct current is unchanged, the intensity of the pulsating direct current is changed periodically along with time and audio frequency, the peak value of the pulsating direct current is consistent with the peak value of the audio current flowing to the plane and is the maximum peak value in a certain time period, then the maximum repulsive force or attractive force is generated, the excitation coils can generate magnetic fields which are consistent with the current and the magnitude, the magnetic fields act on the planar voice coil 13, the audio current led to the planar voice coil 13 is changed along with the change of the excitation coils under the action of the magnetic fields of the excitation coils, namely when the current peak value of the excitation coils is the maximum value, the current peak value of the plane voice coil 13 is also the maximum value, when the current peak value of the excitation coil is the minimum value, the current peak value of the plane voice coil 13 is also the minimum value, and further the conversion efficiency of the loudspeaker is improved, when the excitation coil and the plane voice coil 13 are electrified with audio current, the excitation coil generates a fixed magnetic field which is consistent with the audio current frequency and the size change, the magnetic field of the plane voice coil 13 interacts with the excitation magnetic field, meanwhile, because the excitation coil is fixed, the plane voice coil 13 can move within a certain range under the structure of drum paper, and the plane voice coil 13 makes up and down piston movement under the action of the excitation magnetic field, so that air is driven, and further sound production is realized.

It should be noted that, the upper and lower two excitation coils may be provided with multiple layers to enhance the excitation magnetic field generated thereby, so as to improve the response frequency of the loudspeaker.

In summary, the fixed magnetic steel is fixedly arranged on the upper cover of the bracket, the drum paper is arranged between the upper cover of the bracket and the lower cover of the bracket, the planar voice coil is arranged in the drum paper, and the planar voice coil generates a magnetic field to interact with the magnetic field of the fixed magnetic steel or the magnetic field of the coil by inputting audio current to the planar voice coil, so that the planar voice coil is pushed to move up and down by a piston to push air to generate sound.

The above examples are merely illustrative of the embodiments of the present invention and are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.