CN116887145B - Magnetic circuit structure and double-sided loudspeaker - Google Patents

Abstract

The utility model relates to the technical field of speakers, in particular to a magnetic circuit structure and a double-sided speaker, wherein the magnetic circuit structure comprises an annular magnetic cover, main magnetic steel and auxiliary magnetic steel; the annular magnetic shield comprises an annular frame, a placement part extending towards the inner side of the plane where the annular frame is located is arranged on the inner wall of the annular frame, the annular magnetic shield further comprises a cover plate which is parallel to the plane where the annular frame is located and is arranged at a set distance in a spaced mode, connecting feet connected with the annular frame or the placement part are arranged at two ends of the cover plate, the area of the cover plate is smaller than the area surrounded by the annular frame, a first space for fixing the main magnetic steel is formed in the area between the cover plate and the annular frame, and a second space for fixing the auxiliary magnetic steel is formed between the peripheral side of the cover plate and the annular frame. Through the arrangement, the overall thickness of the magnetic circuit structure is further reduced, so that the overall thickness of the double-sided loudspeaker is reduced. The utility model also discloses a double-sided loudspeaker with the magnetic circuit structure.

Description

Magnetic circuit structure and double-sided loudspeaker

Technical Field

The utility model relates to the technical field of speakers, in particular to a magnetic circuit structure and a double-sided speaker.

Background

Along with the development trend of miniaturization and light weight of electronic products, the size requirement on a loudspeaker is higher and higher, the size of the loudspeaker is required to be small, the loudspeaker is required to have better tone quality, and in order to meet the requirement, a double-sided loudspeaker is generated;

in the prior art, for example, chinese patent No. CN217307862U discloses a double-sided vibration speaker in 2022, 8 and 26, which reduces the overall thickness of the speaker and improves the sound effect of the speaker by providing a double-sided vibration unit and a middle common vibration system; the common vibration system comprises a central pole piece, and a magnetic circuit assembly A and a magnetic circuit assembly B which are arranged on two sides of the central pole piece, wherein each magnetic circuit assembly comprises a washer with a magnet arranged on the outer side of the magnet;

however, the inventors found that the common magnetic circuit in the above-mentioned solution is superimposed in the thickness direction, and still cannot meet the demand for light and thin.

Disclosure of Invention

In view of at least one of the above technical problems, the present utility model provides a magnetic circuit structure and a double-sided speaker, which employ an improvement of a common magnetic circuit portion to further reduce the thickness of the speaker.

According to a first aspect of the present utility model, there is provided a magnetic circuit structure including an annular magnetic shield, a main magnetic steel, and an auxiliary magnetic steel; the annular magnetic shield comprises an annular frame, a placement part extending towards the inner side of the plane where the annular frame is located is arranged on the inner wall of the annular frame, the annular magnetic shield further comprises a cover plate which is parallel to the plane where the annular frame is located and is arranged at a set distance in a spaced mode, connecting feet connected with the annular frame or the placement part are arranged at two ends of the cover plate, the area of the cover plate is smaller than the area surrounded by the annular frame, a first space for fixing the main magnetic steel is formed in the area between the cover plate and the annular frame, and a second space for fixing the auxiliary magnetic steel is formed between the peripheral side of the cover plate and the annular frame.

In some embodiments of the utility model, the thickness of the primary magnetic steel is smaller than the height of the first space, and the thickness of the secondary magnetic steel is smaller than the distance between the cover plate and the annular frame.

In some embodiments of the present utility model, the magnetic steel assembly further includes a main pole piece, wherein the main pole piece is attached to and fixed on a side of the main magnetic steel, which is far away from the cover plate, and the main pole piece is configured to not protrude from a plane where the annular frame is located after being fixed.

In some embodiments of the present utility model, the cover plate is made of the same material as the main pole piece.

In some embodiments of the present utility model, the magnetic shield further comprises an annular pole piece, the annular pole piece is adapted to the auxiliary magnetic steel, the annular pole piece is sleeved outside the shield plate, and the outer surface of the annular pole piece does not protrude out of the top of the shield plate.

In some embodiments of the utility model, the width of the main pole piece is smaller than the width of the cover plate, and the width of the placement part is larger than the maximum width of one side of the annular pole piece.

According to a second aspect of the present utility model, there is also provided a double-sided loudspeaker as set forth in any one of the first aspects, further comprising a first vibration module and a second vibration module disposed on both sides of the magnetic circuit.

In some embodiments of the present utility model, the first vibration module includes a first frame, a first diaphragm peripherally fixed to the first frame, and a first coil fixed to the first diaphragm;

the second vibration module comprises a second basin frame, a second vibrating diaphragm and a second coil, wherein the periphery of the second vibrating diaphragm is fixed on the second basin frame;

the first basin frame is connected with one face of the magnetic circuit structure cover plate, the second basin frame is connected with one face of the magnetic circuit structure main pole piece, and the width of the second coil is smaller than that of the first coil.

In some embodiments of the present utility model, the magnetic circuit structure is provided with a vibration enhancement plate on the cover plate and the main pole piece, and the vibration enhancement plate is configured to emit high-frequency vibration, and the generated high-frequency sound pressure is superimposed with the sound pressure of the first vibration module or the second vibration module.

In some embodiments of the utility model, the vibration enhancement plate is a piezoelectric ceramic plate.

The beneficial effects of the utility model are as follows: according to the utility model, through the arrangement of the annular magnetic cover, the annular frame and the raised cover plate form a first space between the inner part of the cover plate and the annular frame for fixing the main magnetic steel and a second space between the outer side of the cover plate and the annular frame for fixing each auxiliary magnetic steel, so that the common magnetic circuit formed by staggered arrangement is further reduced in the overall thickness of the magnetic circuit structure in a mode of overlapping multiple layers in the prior art, and the overall thickness of the double-sided loudspeaker is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic diagram of a magnetic circuit structure in an embodiment of the present utility model;

FIG. 2 is a schematic view of the exploded view of FIG. 1 in accordance with an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 1 in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a magnetic shield according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view taken along the direction B-B in FIG. 4 in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a magnetic circuit structure with a main pole piece in an embodiment of the present utility model;

FIG. 7 is a schematic structural diagram of a magnetic circuit structure of an annular pole piece in an embodiment of the present utility model;

FIG. 8 is a schematic view of the exploded view of FIG. 7 in accordance with an embodiment of the present utility model;

FIG. 9 is a cross-sectional view taken along the direction C-C in FIG. 7 in accordance with an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of a dual-sided speaker according to an embodiment of the present utility model;

FIG. 11 is a schematic view of the exploded view of FIG. 10 in accordance with an embodiment of the present utility model;

FIG. 12 is a cross-sectional view of FIG. 11 in an embodiment of the utility model;

fig. 13 is a schematic exploded view of a double-sided speaker with a vibration enhancement plate in accordance with an embodiment of the present utility model;

fig. 14 is a cross-sectional view of a dual-sided speaker with a vibration enhancement plate in an embodiment of the present utility model;

FIG. 15 is a graph showing a comparison of sound pressure curves of a vibration enhancement plate fixed to a diaphragm in the related art;

fig. 16 is a graph comparing sound pressure curves of a double-sided speaker with a vibration enhancement plate in an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The magnetic circuit structure 1 as shown in fig. 1 to 9 comprises an annular magnetic cover 11, a main magnetic steel 12 and a secondary magnetic steel 13;

as shown in fig. 4, the annular magnetic shield 11 includes an annular frame 11a, a placement portion 11b extending toward the inner side of the plane in which the annular frame 11a is located is provided on the inner wall of the annular frame 11a, the annular magnetic shield 11 further includes a shield plate 11c disposed parallel to the plane in which the annular frame 11a is located and spaced apart by a set distance, both ends of the shield plate 11c have connection legs 11d connected to the annular frame 11a or the placement portion 11b, the area of the shield plate 11c is smaller than the area surrounded by the annular frame 11a, the area between the shield plate 11c and the annular frame 11a forms a first space a for fixing the main magnetic steel 12, and a second space b for fixing the sub-magnetic steel 13 is formed between the peripheral side of the shield plate 11c and the annular frame 11 a. In the embodiment of the present utility model, by the structural arrangement of the annular magnetic cover 11, the connection leg 11d connected with the cover plate 11c forms a hat-shaped structure protruding from the plane where the annular frame 11a is located, when the main magnetic steel 12 and the auxiliary magnetic steel 13 are fixed specifically, as shown in fig. 3, the main magnetic steel 12 is fixed inside the protruding cover plate 11c, and the auxiliary magnetic steel 13 is fixed on the placement part 11b outside the cover plate 11c, and as shown in fig. 1 and 2, in the embodiment of the present utility model, one main magnetic steel 12 is provided, a plurality of auxiliary magnetic steels 13 are provided, and a plurality of auxiliary magnetic steels 13 are provided to surround the main magnetic steel 12;

with continued reference to fig. 5, in the embodiment of the present utility model, the first space a refers to a space region formed between the bottom of the cover plate 11c and the annular frame 11a, and the second space refers to a region formed outside the cover plate 11c on the upper side of the annular frame 11a, so that the main magnet steel 12 and the auxiliary magnet steel 13 are disposed in almost the same plane, and when the magnetic fields are specifically placed, the polarities of the auxiliary magnet steels 13 on both sides of the main magnet steel 12 are opposite to those of the main magnet steel 12, so as to form a magnetic field that is almost symmetrical up and down as shown in fig. 9. Through this setting, main magnet steel 12 and vice magnet steel 13 carry out staggered arrangement and have only one deck, and then have reduced the overall thickness of magnetic circuit structure 1.

In the above embodiment, by arranging the annular magnetic cover 11, the annular frame 11a and the protruding cover plate 11c form a first space a between the inner part of the cover plate 11c and the annular frame 11a for fixing the main magnetic steel 12, and a second space b between the outer side of the cover plate 11c and the annular frame 11a for fixing each auxiliary magnetic steel 13, so that the common magnetic circuit formed by staggered arrangement is overlapped with the multiple layers in the prior art, the overall thickness of the magnetic circuit structure 1 is further reduced, and the overall thickness of the double-sided loudspeaker is reduced.

In the above embodiment, the thickness of the main magnetic steel 12 is smaller than the height of the first space a, and the thickness of the sub magnetic steel 13 is smaller than the distance between the cover plate 11c and the annular frame 11 a. As shown in fig. 3, in the embodiment of the present utility model, the thickness of the main magnetic steel 12 is smaller than the distance between the bottom of the cover plate 11c and the bottom of the annular frame 11a, and the height of the top of the sub magnetic steel 13 is lower than the height of the top of the cover plate 11c after being fixed on the placement portion 11b, so that the maximum thickness of the magnetic circuit structure 1 is still the maximum height of the magnetic cover.

On the basis of the above embodiment, in order to improve the transmission of the magnetic flux, as shown in fig. 6, the main pole piece 14 is further included, the main pole piece 14 is attached and fixed on the side of the main magnetic steel 12 away from the cover plate 11c, and the main pole piece 14 is configured not to protrude from the plane of the annular frame 11a after being fixed. Since the thickness of the main magnetic steel 12 is smaller than the height of the first space a, a space for fixing the main pole piece 14 is left after the main magnetic steel 12 is fixed, and it should be noted that the fixing of the main magnetic steel 12 and the main pole piece 14 may be implemented in an adhesive manner.

In the embodiment of the present utility model, the material of the cover plate 11c is the same as that of the main pole piece 14. By this arrangement, the cover plate 11c not only plays a role in fixation, but also plays a role in pole pieces, and thus a better magnetic circuit transmission effect can be achieved. It should be noted that, of course, the material of the whole annular magnetic cover 11 may be set to be the same as that of the main pole piece 14 in order to achieve better magnetic circuit transmission.

In order to further improve the transmission of the magnetic induction lines in the magnetic circuit, as shown in fig. 7 to 9, the magnetic circuit further comprises an annular pole piece 15, the annular pole piece 15 is matched with the auxiliary magnetic steel 13, the annular pole piece 15 is sleeved outside the cover plate 11c, and the outer surface of the annular pole piece 15 does not protrude out of the top of the cover plate 11 c. Through such arrangement, as shown in fig. 9, the upper parts of the magnetic induction lines on the middle main magnetic steel 12 enter the annular pole pieces 15 on the two sides through the cover plate 11c, the auxiliary magnetic steels 13 on the two sides of the bottom enter the main pole pieces 14 through the placement parts 11b on the annular frame 11a, so as to form a stable magnetic field, and further facilitate the improvement of the movement of the coil in the loudspeaker for cutting the magnetic induction lines.

In the embodiment of the present utility model, in order to further improve the magnetic field distribution effect, please continue to refer to fig. 9, the width of the main pole piece 14 is smaller than the width of the cover plate 11c, and the width of the placement portion 11b is larger than the maximum width of one side of the annular pole piece 15. Through the arrangement, the region with the strongest magnetic induction line of the magnetic field can be dislocated, and through the arrangement, coils of the cut magnetic induction line can be dislocated and distributed, so that the thickness of the whole loudspeaker can be further reduced.

In an embodiment of the present utility model, there is also provided a double-sided speaker as shown in fig. 10 to 14, including the above-described magnetic circuit structure 1, and further including a first vibration module 2 and a second vibration module 3 respectively provided at both sides of the magnetic circuit structure 1. Referring to fig. 12, in some embodiments of the present utility model, a first vibration module 2 includes a first frame 21, a first diaphragm 22 fixed on the first frame 21, and a first coil 23 fixed on the first diaphragm 22; the second vibration module 3 comprises a second frame 31, a second vibrating diaphragm 32 with the periphery fixed on the second frame 31, and a second coil 33 fixed on the second vibrating diaphragm 32; wherein, the first basin frame 21 is connected with the one side that the cover plate 11c of the magnetic circuit structure 1 is located, the second basin frame 31 is connected with the one side that the main pole piece 14 of the magnetic circuit structure 1 is located, and the width of the second coil 33 is smaller than the width of the first coil 23. Like this, through all setting up vibration module at the upper and lower both sides of magnetic circuit structure 1, through two-way drive, improved the audio, and compare with prior art in addition, the whole thickness of speaker is reduced, and, because first coil 23 can stretch into the gap between annular pole piece 15 and the cover plate 11c, second coil 33 can stretch into in the gap between annular frame 11a and main pole piece 14, and through the setting of first coil 23 and second coil 33 dislocation, can utilize the most stable magnetic induction line in the magnetic field to provide the dynamic field for the vibration of coil, and then further reduced the whole thickness of speaker.

In order to further improve the sound effect of the double-sided speaker, in the embodiment of the present utility model, as shown in fig. 13 and 14, a vibration enhancement plate 4 is further provided, and in the magnetic circuit structure 1, the vibration enhancement plate 4 is provided on both the cover plate 11c and the main pole piece 14, and the vibration enhancement plate 4 is configured to emit high-frequency vibration, and the generated high-frequency sound pressure is superimposed with the sound pressure of the first vibration module 2 or the second vibration module 3. Although the inventor knows that there is a structural form in the related art that the vibration enhancing plate 4 is disposed on the diaphragm, it is found that, in the specific implementation, the vibration enhancing plate 4 in the related art cannot be matched with the working voltage of the coil of the speaker, and cannot be applied, and the vibration enhancing plate 4 is directly fixed on the diaphragm or the dome of the diaphragm due to its own weight, so that the acoustic performance of the speaker itself is suppressed, and vibration damping is formed, as shown in fig. 15, after the vibration enhancing plate 4 is added on the diaphragm in the related art, the sound pressure curve is reduced instead compared with the original sound pressure, and the opposite effect is achieved; in the embodiment of the present utility model, in order to further improve the high frequency effect, as shown in fig. 13 and 14, the vibration reinforcing plate 4 is directly fixed on the top surface of the cover plate 11c and the bottom surface of the main pole piece 14, so arranged that the vibration reinforcing plate 4 emits high frequency vibration without affecting the diaphragm, and generates high frequency sound pressure which is superimposed with the sound pressure of the diaphragm so that the final high frequency is extended; as shown in fig. 16, the sound pressure high frequency without the vibration enhancing plate 4 is cut off at around 9KHz, whereas the sound pressure of the speaker with the vibration enhancing plate 4 can reach the ultra-high expansion bandwidth of 40KHz, and further the high frequency sound pressure of the double-sided speaker is further improved by the above-described improvement in the embodiment of the present utility model. It should be noted here that in some embodiments of the present utility model, the vibration enhancement plate 4 is a piezoelectric ceramic plate. The ceramic piezoelectric plate can be selected from a plurality of layers of piezoelectric ceramic plates to obtain better vibration effect, and can be replaced by other electric driving vibration structures in the field.

It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (7)

1. The double-sided loudspeaker is characterized by comprising a magnetic circuit structure, and further comprising a first vibration module and a second vibration module which are respectively arranged at two sides of the magnetic circuit structure;

the magnetic circuit structure comprises an annular magnetic cover, main magnetic steel and auxiliary magnetic steel; the annular magnetic shield comprises an annular frame, a placing part extending towards the inner side of a plane where the annular frame is located is arranged on the inner wall of the annular frame, the annular magnetic shield further comprises cover plates which are parallel to the plane where the annular frame is located and are arranged at intervals by a set distance, connecting feet connected with the annular frame or the placing part are arranged at two ends of each cover plate, the area of each cover plate is smaller than the area surrounded by the annular frame, a first space for fixing the main magnetic steel is formed in the area between each cover plate and the annular frame, and a second space for fixing the auxiliary magnetic steel is formed between the peripheral side of each cover plate and the annular frame; the magnetic circuit structure further comprises a main pole piece, wherein the main pole piece is attached and fixed on one side of the main magnetic steel, which is far away from the cover plate, and the main pole piece is configured to be fixed and not protrude out of the plane where the annular frame is located;

the magnetic circuit structure is characterized in that the cover plate and the main pole piece are respectively provided with a vibration reinforcing plate, the vibration reinforcing plates are configured to emit high-frequency vibration, and the generated high-frequency sound pressure is superposed with the sound pressure of the first vibration module or the second vibration module.

2. The double-sided loudspeaker of claim 1, wherein the thickness of the primary magnetic steel is less than the height of the first space and the thickness of the secondary magnetic steel is less than the spacing of the cover plate from the annular frame.

3. The magnetic circuit structure of claim 1, wherein the cover plate is made of the same material as the main pole piece.

4. The double-sided loudspeaker of claim 1, further comprising an annular pole piece, wherein the annular pole piece is adapted to the secondary magnetic steel, and wherein the annular pole piece is sleeved outside the cover plate, and wherein the outer surface of the annular pole piece does not protrude from the top of the cover plate.

5. The double-sided speaker of claim 4, wherein the width of the main pole piece is smaller than the width of the cover plate, and the width of the placement portion is larger than the maximum width of the single side of the annular pole piece.

6. The double-sided speaker of claim 1, wherein the first vibration module comprises a first frame, a first diaphragm peripherally fixed to the first frame, and a first coil fixed to the first diaphragm;

the second vibration module comprises a second basin frame, a second vibrating diaphragm and a second coil, wherein the periphery of the second vibrating diaphragm is fixed on the second basin frame;

the first basin frame is connected with one face of the magnetic circuit structure cover plate, the second basin frame is connected with one face of the magnetic circuit structure main pole piece, and the width of the second coil is smaller than that of the first coil.

7. The dual-sided speaker of claim 1, wherein the vibration enhancement plate is a piezoelectric ceramic plate.