TW202029784A - Planar moving magnetic speaker - Google Patents

Abstract

A planar moving magnetic speaker includes a diaphragm, a flat magnetic element, a magnetic conductive element, and a coil. The diaphragm has a surface. The flat magnetic element is disposed on a surface of the diaphragm, and the flat magnetic element includes an opposite first magnetic pole and a second magnetic pole. The magnetic conductive element includes a first magnetic conductive portion, a second magnetic conductive portion, and a third magnetic conductive portion. The first magnetic conductive portion and the second magnetic conductive portion are respectively connected to opposite ends of the thrid magnetic conductive portions, and the first magnetic conductive portion and the second magnetic conductive portion respectively extend toward the diaphragm. The first magnetic conductive portion includes a first magnetic conductive end away from the third magnetic conductive portion. The first magnetic conductive end is corresponding to, and is adjacent to but does not contact to the first magnetic pole. The second magnetic conductive portion includes the second magnetic conductive portion away from the third magnetic conductive portion. The second magnetic conductive end is corresponding to, and is adjacent to but does not contact to the second magnetic pole. The coil is wound around the magnetic conductive element.

Description

Planar moving magnetic speaker unit

This application relates to the field of electroacoustics, which is a planar moving magnetic speaker unit.

The traditional speakers and earphones mainly use the magnetic force generated by the permanent magnet to interact with the magnetic force generated by the electromagnetic induction of the voice coil to drive the vibration mode. However, the moving coil type single body has the voice coil placed in the gap on the side of the magnet. Since the magnet is strongest at the end point, the magnetic force received by the voice coil on the side of the magnet is attenuated.

In addition, the voice coil is usually placed under the vibration mode and cannot be completely placed in the gap between the magnets. In fact, only about 50 to 60% of the area of the magnet and the voice coil will interact, making the conversion efficiency of electromagnetic induction low. To achieve higher power, larger magnets are required.

Here, a planar moving magnetic speaker unit is provided. The planar moving magnetic speaker unit includes a diaphragm, a flat magnetic element, a magnetic conductor, and a coil. The diaphragm has a surface. The flat magnetic element is arranged on the surface of the diaphragm, and the flat magnetic element includes a first magnetic pole and a second magnetic pole opposite to each other. The magnetic conductive element includes a first magnetic conductive portion, a second magnetic conductive portion, and a third magnetic conductive portion. The first magnetic conductive portion and the second magnetic conductive portion are respectively connected to opposite ends of the third magnetic conductive portion, and the first magnetic conductive portion and the second magnetic conductive portion respectively extend toward the diaphragm. The first magnetically permeable portion includes a first magnetically permeable end far away from the third magnetically permeable portion, the first magnetically permeable end is correspondingly adjacent to the first magnetic pole but not in contact, and the second magnetically permeable portion includes a second magnetically permeable end away from the third The magnetically permeable end, the second magnetically permeable end is correspondingly adjacent to the second magnetic pole but not in contact. The coil is wound on the magnetic conductive part.

In some embodiments, the distance between the first magnetically conductive end and the second magnetically conductive end is greater than the length of the flat magnetic element.

In some embodiments, the first magnetically permeable end includes a first beveled plane, and the second magnetically permeable end includes a second beveled plane. Further, in some embodiments, the angle between the first oblique plane and the extending direction parallel to the flat magnetic element is 5 to 45 degrees.

Furthermore, in some embodiments, the first oblique plane of the first magnetically permeable end and the second oblique plane of the second magnetically permeable end are mirror images of each other.

Furthermore, in some embodiments, the included angle is 10 to 30 degrees.

In some embodiments, the flat magnetic element is a magnetic diaphragm. In other embodiments, the flat magnetic element is a magnetic composite plate, and the magnetic composite plate includes a magnetic plate body and a protective layer, and the magnetic plate body is wrapped in the protective layer.

In some embodiments, the diaphragm is a paper cone diaphragm, a plastic diaphragm, a metal diaphragm, a synthetic fiber diaphragm, or a composite diaphragm.

In some embodiments, the magnetic conductive member is a silicon steel sheet member or an iron powder core member.

By aligning the first magnetic end and the second magnetic end of the magnetic conductive element to and adjacent to the first magnetic pole and the second magnetic pole of the flat magnetic element, the interaction between the magnet and electromagnetic induction can be greatly improved to achieve higher The conversion efficiency. In addition, the overall process is simpler and the cost is reduced.

In the drawings, the widths of some elements, regions, etc. are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, or portions, these elements, components, regions, and/or portions are not Should be limited by these terms. These terms are only used to distinguish one element, component, region, or section from another element, component, region, layer or section. Therefore, the “first element,” “component,” “region,” or “portion” discussed below may be referred to as a second element, component, region, or portion without departing from the teachings herein.

In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship between one element and another element, as shown in the figure. It should be understood that relative terms are intended to include different orientations of the device other than those shown in the figures. For example, if the device in one figure is turned over, elements described as being on the "lower" side of other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" may include an orientation of "lower" and "upper", depending on the specific orientation of the drawing. Similarly, if the device in one figure is turned over, elements described as "below" other elements will be oriented "above" the other elements. Thus, the exemplary terms "below" or "below" can include an orientation of above and below.

FIG. 1 is a schematic cross-sectional view of an embodiment of a planar moving magnetic speaker unit. As shown in FIG. 1, the planar moving magnetic speaker unit 1 includes a housing 10, a diaphragm 20, a flat magnetic element 30, a magnetic conductor 40, and a coil 50. The diaphragm 20 is assembled and fixed to the housing 10. The diaphragm 20 has a surface 21. The flat magnetic element 30 is disposed on the surface 21 of the diaphragm 20. The flat magnetic element 30 includes a first magnetic pole 31 and a second magnetic pole 33 opposed to each other. Here, N and S represent the magnetic direction, but this is only an example and not limited thereto.

The magnetic conductive member 40 is accommodated in the housing 10, and the magnetic conductive member 40 includes a first magnetic conductive portion 41, a second magnetic conductive portion 43 and a third magnetic conductive portion 45. The first bottom end 413 of the first magnetically conductive portion 41 and the second bottom end 433 of the second magnetically conductive portion 43 are respectively connected to opposite ends of the third magnetically conductive portion 45. The first magnetically conductive portion 41 and the second magnetically conductive portion The portion 43 has been substantially perpendicular to the normal direction D1 of the third magnetic conductive portion 45 and extends toward the diaphragm 20. The first magnetically conductive portion 41 includes a first magnetically conductive end 411 far away from the third magnetically conductive portion 45. The first magnetically conductive end 411 is correspondingly adjacent to the first magnetic pole 31 but not in contact with each other. The second magnetically conductive portion 43 includes The second magnetic conductive end 431 of the magnetic conductive portion 45. The second magnetically conductive end 431 is correspondingly adjacent to the second magnetic pole 33 but not in contact. The coil 50 is wound on the magnetic conductive member 40.

Here, the coil 50 can pass through the hole 11 of the housing 10 and be connected to a signal terminal (not shown in the figure), and receives an audio signal from the terminal. The audio signal is in the form of alternating current, which continuously changes the phase of the current. Here, the change of the current is represented by +/-. Therefore, due to the change of the current direction, the coil 50 generates a constantly changing N/S magnetic field, which is transmitted to the first magnetic conductive portion 41 and the second magnetic conductive portion via the magnetic conductive member 40 43. Thereby, it can interact with the magnetic field generated by the flat magnetic element 30 by the continuously changing N/S magnetic field, whereby the first magnetic conductive portion 41 and the second magnetic conductive portion 43 are connected to the first magnetic pole 31 and the second magnetic pole 31 and the second magnetic field. The change in the repulsive force or the attractive force between the magnetic poles 33 can cause the flat magnetic element 30 to drive the diaphragm 20 to move outward or drive the diaphragm 20 to move inward. However, the assembling manner of the coil 50 passing through the hole 11 is only an example, not a limitation.

Figure 2 is a partial enlarged view of Figure 1. As shown in FIGS. 1 and 2, the distance L1 between the first magnetically conductive end 411 and the second magnetically conductive end 431 is greater than the length L2 of the flat magnetic element 30, so that the first magnetic pole 31 and the second magnetic pole 33 Will not contact the first magnetically permeable end 411 and the second magnetically permeable end 431, thereby avoiding the first magnetic pole 31 and the second magnetic pole 33 and the first magnetically permeable end 411 and the second magnetically permeable end 431 from interacting with each other when the magnetic field interacts. Adsorption, so as to maintain the normal operation of the magnetic conductive member 40 and the flat magnetic element 30 without contact.

Further, as shown in FIGS. 1 and 2, the first magnetically permeable end 411 includes a first oblique plane 415, and the second magnetically permeable end 431 includes a second oblique plane 435. This is to make the first magnetic pole 31 and the When the two magnetic poles 33 interact with the first magnetic terminal 411 and the second magnetic terminal 431 in the magnetic field, even if they are attracted to each other due to too strong attraction, they only reach point contact without surface contact. When the coil 50 When the phase of the current changes, the first magnetic pole 31 and the first magnetic end 411, or the second magnetic pole 33 and the second magnetic end 431 can be quickly separated through the reverse repulsive force, and the magnetic conductive member 40 and The flat magnetic element 30 operates normally without contact. However, the chamfered plane is only an example, and is not limited to this. For example, the first magnetically permeable end 411 and the second magnetically permeable end 431 can also be configured to have sharp or polygonal structures to avoid the first The magnetic pole 31 is in surface contact with the first magnetic end 411 or the second magnetic pole 33 and the second magnetic end 431.

Fig. 3 is a partial enlarged view of the second magnetic conductive part of Fig. 1. As shown in FIGS. 1 to 3, the angle θ between the first oblique plane 415 and the extension direction D2 parallel to the flat magnetic element 30 is 5 to 45 degrees, and the second oblique plane 435 is parallel to the flat magnetic element 30. The angle θ of the extension direction D2 is 5 to 45 degrees. Further, the included angle θ is preferably 10 to 30 degrees.

In addition, the normal direction D1 of the first oblique plane 415 and the second oblique plane 435 is toward the flat magnetic element 30, so that the maximum magnetic force generated by the coil 50 through electromagnetic induction interacts with the flat magnetic element 30 By pushing the diaphragm 20, the efficiency of electro-acoustic conversion can be improved. In addition, the first oblique plane 415 of the first magnetically conductive end 411 and the second oblique plane 435 of the second magnetically conductive end 431 are mirror images of each other, so that the flat magnetic element 30 is felt by the coil 50 The intensity of the magnetic field generated by electromagnetic induction and guided by the first magnetic end 411 and the second magnetic end 431 is more uniform.

4 is a partial enlarged view of an embodiment of the flat magnetic element in FIG. 1. As shown in FIG. 4, the flat magnetic element 30 is a magnetic composite plate. The flat magnetic element 30 includes a magnetic plate 310 and a protective layer 330, and the magnetic plate 310 is covered in the protective layer 330. Here, the protective layer 330 can be an adhesive film or a plastic sheet to protect the hard magnetic board 310. However, this is only an example and not a limitation. The flat magnetic element 30 may also be a magnetic film plate or a magnetic film. The flat magnetic element 30 can be configured according to the volume of the actual planar moving magnetic speaker unit 1 and the required power.

Since the planar moving magnetic speaker unit 1 can set the interaction force between the permanent magnetic field of the flat magnetic element 30 and the magnetic field generated by the electromagnetic induction of the coil 50 through the density of the magnetic conductive member 40 and the coil 50. Therefore, the flat magnetic element 30 of the planar moving magnetic speaker unit 1 does not need to be provided with a larger magnet as the moving coil type unit to generate a larger magnetic force, so that the planar moving magnetic speaker unit 1 can be reduced. The volume, and achieve the effect of thinning. In addition, compared with the prior art magnet, the flat magnetic element 30 can also greatly reduce the cost. In addition, under the condition that the same power is to be achieved, the flat magnetic element 30 can be lighter than the moving coil voice coil, thereby reducing the influence of inertia. Therefore, the delay caused by the reciprocating motion of the diaphragm 20 is also reduced. Can be reduced.

Furthermore, in the manufacturing process, the flat magnetic element 30 can be magnetized only when it is assembled with the diaphragm 20 and the housing 10. In the previous manufacturing process, it can be completely non-magnetic, which can avoid iron content. Dust is inhaled, and noise is generated during interaction. Therefore, the production and assembly environment can be less severe, the overall production method is easier, and the production cost can be greatly reduced. In addition, compared with the existing moving coil type monomer, the assembly of the coil and the terminal needs to penetrate through the diaphragm. Here, the coil 50 is only wound on the magnetic conductive member 40 and can be connected through the hole 11 or other methods. The assembly method is simpler, greatly reducing the production process and production difficulty.

Further, the diaphragm 20 may be a paper cone diaphragm, a plastic diaphragm, a metal diaphragm, a synthetic fiber diaphragm, or a composite diaphragm. Since the planar moving magnetic speaker unit 1 can determine the magnitude of the interaction force through the density of the magnetic conductive member 40 and the coil 50, the appropriate diaphragm 20 material can be selected according to the desired frequency response without being affected limit.

In addition, the magnetic conductive member 40 is a silicon steel sheet member or an iron powder core member. Since these materials are widely used in the prior art and are cheap, the manufacturing cost can be further reduced. In addition, the size of the magnetic conductive member 40 can be adjusted according to the volume of the planar moving magnetic speaker unit 1 and the required power, and can be used in earphones, speakers, and microphones.

In summary, by arranging the first magnetic end 411 and the second magnetic end 431 of the magnetic conductive member 40 to correspond to and be adjacent to the first magnetic pole 31 and the second magnetic pole 33 of the flat magnetic element 30, at the end that emits the magnetic field A strong magnetic field interacts with the permanent magnetic field of the flat magnetic element 30 on the part, thereby greatly improving the efficiency of electro-acoustic conversion. In addition, the overall process is simpler and the cost is reduced.

Although the technical content of the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Anyone who is familiar with this technique and makes some changes and modifications without departing from the spirit of the present invention should be covered by the present invention Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1: Planar moving magnetic speaker unit 10: Shell 11: Hole 20: diaphragm 21: Surface 30: Flat magnetic element 31: first pole 33: second magnetic pole 40: Magnetically conductive parts 41: The first magnetic part 411: The first magnetic end 413: first bottom 415: first oblique plane 43: The second magnetic part 431: second magnetic end 433: second bottom 435: second oblique plane 45: The third magnetic part 50: coil 310: Magnetic board 330: protective layer D1: Normal direction D2: Extension direction L1: distance L2: length

FIG. 1 is a schematic cross-sectional view of an embodiment of a planar moving magnetic speaker unit. Figure 2 is a partial enlarged view of Figure 1. Fig. 3 is a partial enlarged view of the second magnetic conductive part of Fig. 1. 4 is a partial enlarged view of an embodiment of the flat magnetic element in FIG. 1.

1: Planar moving magnetic speaker unit

10: Shell

11: Hole

20: diaphragm

21: Surface

30: Flat magnetic element

31: first pole

33: second magnetic pole

40: Magnetically conductive parts

41: The first magnetic part

411: The first magnetic end

413: first bottom

415: first oblique plane

43: The second magnetic part

431: second magnetic end

433: second bottom

435: second oblique plane

45: The third magnetic part

50: coil

D1: Normal direction

D2: Extension direction

Claims (10)

A plane moving magnetic speaker unit, including: A diaphragm with a surface; A flat magnetic element arranged on the surface of the diaphragm, and the flat magnetic element includes a first magnetic pole and a second magnetic pole opposite to each other; A magnetically permeable part, including a first magnetically permeable portion, a second magnetically permeable portion, and a third magnetically permeable portion, the first magnetically permeable portion and the second magnetically permeable portion are respectively connected to the third magnetically permeable portion The first magnetically permeable portion and the second magnetically permeable portion respectively extend toward the diaphragm. The first magnetically permeable portion includes a first magnetically permeable end away from the third magnetically permeable portion. The first magnetically permeable end is correspondingly adjacent to the first magnetic pole but does not contact, the second magnetically permeable portion includes a second magnetically permeable end away from the third magnetically permeable portion, and the second magnetically permeable end is correspondingly adjacent to the second magnetic pole But no contact; and A coil is wound on the magnetic conductive part. The planar moving magnetic speaker unit according to claim 1, wherein the distance between the first magnetic conductive end and the second magnetic conductive end is greater than the length of the flat magnetic element. The planar moving magnetic speaker unit according to claim 1, wherein the first magnetic end includes a first oblique plane, and the second magnetic end includes a second oblique plane. The planar moving magnetic speaker unit according to claim 3, wherein an included angle between the first oblique plane and an extension direction parallel to the flat magnetic element is 5 to 45 degrees. The planar moving magnetic speaker unit according to claim 4, wherein the included angle is 10 to 30 degrees. The planar moving magnetic speaker unit according to claim 3, wherein the first beveled plane of the first magnetically conductive end and the second beveled plane of the second magnetically conductive end are mirror images of each other. The planar moving magnetic speaker unit according to claim 1, wherein the flat magnetic element is a magnetic diaphragm. The planar moving magnetic speaker unit according to claim 1, wherein the flat magnetic element is a magnetic composite plate, and the magnetic composite plate includes a magnetic plate body and a protective layer, and the magnetic plate body covers In the protective layer. The planar moving magnetic speaker unit according to claim 1, wherein the diaphragm is a paper cone diaphragm, a plastic diaphragm, a metal diaphragm, a synthetic fiber diaphragm, or a composite diaphragm. The planar moving magnetic speaker unit according to claim 1, wherein the magnetic conductive member is a silicon steel sheet member or an iron powder core member.

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