Multi-magnetic circuit speakers and car audio systems

Abstract

A multi-magnetic circuit speaker and car audio system. The multi-magnetic circuit speaker comprises a frame, a diaphragm having an outer edge connected to the upper end of the frame, a plurality of voice coils, each with its upper end connected to the diaphragm, and a magnetic circuit mechanism having a plurality of magnetic gaps, wherein each voice coil corresponds to one of the magnetic gaps and is inserted into the corresponding magnetic gap, and the magnetic circuit mechanism includes a magnetic yoke cup connected to the frame and a plurality of magnet assemblies provided within the magnetic yoke cup, wherein the magnetic yoke cup has a plurality of housing grooves, one of the magnet assemblies provided in each housing groove, and the magnetic gap is formed between the side wall of each housing groove and the outer surface of the magnet assembly located within the housing groove, and the magnetic yoke cup further has a communication groove located between the plurality of housing grooves and connecting the plurality of housing grooves. The multi-magnetic circuit speaker has good heat dissipation performance, is easy to assemble, requires few jigs, and has good structural stability.

Description

Related Applications

[0001] This application claims priority to Chinese Patent Application No. CN2023210717142, filed on May 8, 2023.

Technical Field

[0002] The present disclosure relates to speakers, and particularly to multi-magnetic circuit speakers and car audio systems equipped with the same.

Background Art

[0003] Speakers usually include diaphragms, voice coils, dampers, magnetic circuit systems, etc. However, car speakers used to constitute audio systems for car roofs and headrests are required to have characteristics such as lightweight, small size, high output, and good low-frequency lower limit. Conventional speakers with a single damper are generally heavy, large in volume, and require a large mounting depth. Although damperless speakers are lightweight and small in size, their output is low. Neither of these two types of conventional speakers is suitable for use as speakers for car roof and headrest audio systems.

[0004] Currently, multi-input type speakers have emerged. These speakers employ multiple magnetic circuit mechanisms, each magnetic circuit mechanism drives one voice coil, and multiple voice coils jointly drive one diaphragm to vibrate, thereby increasing the output while preventing the speaker from occupying excessive space, and achieving miniaturization and high output of the speaker. This type of speaker can be installed in a narrow space, saving in-vehicle space and increasing the sense of quantity of the low frequency of the speaker. However, this speaker has several drawbacks. Each magnetic circuit mechanism includes a yoke cup and a magnet assembly housed within the yoke cup, and since a voice coil is inserted into each yoke cup, there are drawbacks such as a large total amount of heat generated, poor heat dissipation, inconvenient assembly, and low structural stability.

Summary of the Invention

[0005] This disclosure relates to a multi-magnetic circuit speaker and a car audio system that utilizes this multi-magnetic circuit speaker.

[0006] The first aspect of this disclosure provides a multi-magnetic circuit speaker, which is a speaker that Frame and, A diaphragm having an outer edge connected to the upper end of the frame, Multiple voice coils, each with an upper end connected to the diaphragm, A magnetic circuit mechanism having multiple magnetic gaps, Equipped with, Each voice coil corresponds to one of the magnetic gaps and is inserted into the corresponding magnetic gap. The magnetic circuit mechanism includes a magnetic yoke cup connected to the frame and a plurality of magnet assemblies provided within the magnetic yoke cup, wherein the magnetic yoke cup has a plurality of housing grooves, one of the magnet assemblies provided within each housing groove, a magnetic gap is formed between the side wall of each housing groove and the outer surface of the magnet assembly located within the housing groove, and the magnetic yoke cup further has a communication groove located between the plurality of housing grooves and connecting the plurality of housing grooves.

[0007] In some embodiments, the magnetic yoke cup comprises a base plate, a plurality of arc-shaped side plates extending upward from the base plate, and connecting plates connecting adjacent arc-shaped side plates, each of which encloses one of the housing grooves, the communication groove being enclosed by two or more of the connecting plates, and a portion of the magnetic gap located between the arc-shaped side plates and the magnet assembly.

[0008] In some embodiments, the width of the communication groove is smaller than the diameter of the receiving groove.

[0009] In some embodiments, the arc-shaped side plate extends along the arc, and the central angle of the arc is 270 degrees or more and less than 360 degrees.

[0010] In some embodiments, the two arc-shaped side plates are connected by the two connecting plates, and the two receiving grooves are connected by a single communication groove, which is a straight groove.

[0011] In some embodiments, the two arc-shaped side plates are connected by the two connecting plates, and the two receiving grooves are connected by a single communication groove, which is a straight groove.

[0012] In some embodiments, the multimagnetic circuit speaker further comprises a damper and a connecting frame, wherein the damper is fixedly connected to the frame, the upper end of the connecting frame is fixedly connected to the diaphragm, and the lower end of the connecting frame is fixedly connected to the damper.

[0013] In some embodiments, the number of dampers is multiple and they are installed symmetrically, and the multiple voice coils or magnetic circuit mechanisms are located between the multiple dampers, and each damper has an outer edge fixedly connected to the frame and an inner edge adjacent to the voice coil or magnetic circuit mechanism, and the lower end of the connecting frame is fixedly connected to the inner edge of the damper.

[0014] In some embodiments, a pair of soldering tabs are provided on the frame, one lead wire of each voice coil is connected to one of the pair of soldering tabs, and the other lead wire of each voice coil is connected to the other soldering tab, and the multiple voice coils are connected to each other in series or in parallel.

[0015] In some embodiments, the frame includes a first frame and a second frame stacked on top of each other, the first frame and the second frame each having magnetic circuit mounting holes, and the magnetic yoke cup is installed in the magnetic circuit mounting hole and fixedly connected to the hole wall of the magnetic circuit mounting hole.

[0016] In some embodiments, the multimagnetic circuit speaker further comprises a damper and a connecting frame, the first frame having a hollow region, the outer edge of the damper being fixedly connected to the lower surface of the first frame, the inner edge of the damper being fixedly connected to the lower end of the connecting frame, the connecting frame penetrating the hollow region, and its upper end being fixedly connected to the diaphragm.

[0017] In some embodiments, ventilation holes are provided on the second frame, and the multimagnetic circuit speaker further comprises a sound-absorbing and ventilating cloth covering the ventilation holes, the sound-absorbing and ventilating cloth being fixed to the outer or inner surface of the second frame.

[0018] In some embodiments, the speaker further comprises a wire harness assembly, the wire harness assembly including cables and connectors, the cables being connected to the soldering tabs.

[0019] In some embodiments, the magnetic circuit mechanism includes a single magnetic yoke cup.

[0020] A second aspect of this disclosure is the provision of a car audio system including the multi-magnetic circuit speaker described above.

[0021] This disclosure offers the following advantages by adopting the above configuration.

[0022] The multi-magnetic circuit speaker of this disclosure has multiple voice coils sharing a single magnetic yoke cup, and multiple housing grooves are provided within the magnetic yoke cup, with the multiple housing grooves being connected by connecting grooves. The heat generated when the voice coils reciprocate in each magnetic gap to drive the diaphragm and produce sound can be dissipated through the connecting grooves, resulting in good heat dissipation performance, simplified assembly, fewer jigs used for assembly, and good structural stability. [Brief explanation of the drawing]

[0023] To more clearly explain the technical solutions of the present disclosure, the drawings that need to be used in the following description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings based on these drawings without creative labor.

[0024] [Figure 1] Figure 1 is an exploded view of a multi-magnetic circuit speaker according to an embodiment of the present disclosure. [Figure 2] Figure 2 is a top view of a multi-magnetic circuit speaker according to an embodiment of the present disclosure, and the wire harness assembly is not shown. [Figure 3] Figure 3 is a cross-sectional view taken along the line A-A of Figure 2. [Figure 4] Figure 4 is a cross-sectional view taken along the line B-B of Figure 2. [Figure 5] Figure 5 is a structural diagram of a magnetic yoke cup according to an embodiment of the present disclosure. [Figure 6] Figure 6 is a comparison diagram of frequency response curves of an example and a proportional example. [Figure 7] Figure 7 is a comparison diagram of distortion curves of an example and a proportional example.

Description of Reference Numerals

[0025] 1 Frame, 11 First Frame, 111 Magnetic Circuit Mounting Hole, 112 Hollow Region, 12 Second Frame, 121 Vent Hole, 13 Front Cover Plate, 2 Diaphragm, 21 Edge, 211 Striped Pattern, 22 Body, 3 Voice Coil, 31 Lead Wire, 4 Magnetic Circuit Mechanism, 41 Magnetic Gap, 42 Magnetic Yoke Cup, 421 Accommodation Groove, 422 Communication Groove, 423 Bottom Plate, 424 Side Plate, 425 Connection Plate, 43 Magnet Assembly, 431 First Magnet, 432 Front Plate, 433 Second Magnet, 5 Damper, 51 Outer Edge, 52 Inner Edge, 6 Connection Frame, 7 Soldering Tab, 9 Sound Absorbing Vent Cloth, 10 Wire Harness Assembly, 101 Cable, 102 Connector

Embodiments for Carrying Out the Invention

[0026] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. This will make the advantages and features of the present disclosure more readily understandable to those skilled in the art. It should be noted that these descriptions of embodiments are intended to aid in understanding the present disclosure and are not intended to limit it. Furthermore, the technical features relating to each embodiment of the present disclosure described below can be combined with each other, insofar as they do not conflict with each other.

[0027] In this disclosure, "inside" and "outside" are defined with respect to the center line of the corresponding voice coil, with the direction closer to the center line of the voice coil being considered "inside" and the direction further away being considered "outside." The directional terms "up," "down," and "horizontal" are provided to facilitate understanding of the speaker's structure for those skilled in the art and do not limit the state of the speaker after it has been mounted in a usage scenario (e.g., an automobile). For example, the speaker may be mounted on an inclined member, an upright member, or the underside of a member.

[0028] This embodiment provides a type of multi-magnetic circuit speaker and a car audio system using said multi-magnetic circuit speaker. The multi-magnetic circuit speaker will be described in detail below.

[0029] Referring to Figures 1 to 5, the multi-magnetic circuit speaker comprises a frame 1, a diaphragm 2, a front cover plate 13, multiple voice coils 3, a magnetic circuit mechanism 4, multiple dampers 5, multiple connecting frames 6, and a wire harness assembly 10.

[0030] The diaphragm 2 has an outer edge connected to the upper end of the frame 1. Specifically, the diaphragm 2 includes a diaphragm body 22 and an edge 21. The diaphragm body 22 is flat, and in this embodiment, a cone made of multilayer composite material is used, and the diaphragm body 22 as a whole is rectangular or a rectangle with rounded corners. The edge 21 surrounds the diaphragm body 22 and is bonded to the frame 1 via the edge 21. When viewed in a cross-section along the vertical direction of the edge 21, the central part of the edge 21 is arched upwards. The four corners of the edge 21 are provided with downwardly recessed stripe-like patterns 211, which effectively improve the problem of the diaphragm 2 being prone to bending at the corners when vibrating up and down, effectively enhance the balance and stability of the vibration of the diaphragm 2, improve the pure tone, distortion, and rolling of the speaker, and enable the speaker to obtain better acoustic performance.

[0031] Furthermore, the front cover plate 13 is fixedly connected to the upper end of the frame 1 and presses the outer edge of the edge 21 onto the frame 1. The front cover plate 13 is ring-shaped and hollow in the center, so it does not obstruct the main body portion of the diaphragm 2, including the diaphragm body 22 and most of the edge 21.

[0032] Specifically, there are two voice coils 3, and the upper end of each voice coil 3 is connected to the diaphragm 2. Specifically, the two voice coils 3 are spaced apart along the longitudinal direction of the diaphragm 2, as shown in Figure 4.

[0033] The magnetic circuit mechanism 4 has multiple magnetic gaps 41, and each voice coil 3 corresponds to one magnetic gap 41. The voice coil 3 is inserted into the corresponding magnetic gap 41 and drives the diaphragm 2 to produce sound. As shown in Figures 1 and 4, the magnetic circuit mechanism 4 includes a magnetic yoke cup 42 connected to the frame 1 and multiple magnet assemblies 43 provided within the magnetic yoke cup 42. The magnetic yoke cup 42 has multiple housing grooves 421, with one magnet assembly 43 provided within each housing groove 421. A magnetic gap 41 is formed between the side wall of each housing groove 421 and the outer surface of the magnet assembly 43 located within it. Specifically, the number of magnetic gaps 41, magnet assemblies 43, and housing grooves 421 are two, corresponding to the number of voice coils 3.

[0034] Each magnet assembly 43 includes a first magnet 431, a second magnet 433, and a front plate 432 provided between the two magnets, and the first magnet 431, the front plate 432, and the second magnet 433 are sequentially stacked within the magnetic yoke cup 42. The upper surface of the front plate 432 is bonded to the first magnet 431, the lower surface of the front plate 432 is bonded to the upper surface of the second magnet 433, and the lower surface of the second magnet 433 is bonded to the bottom plate of the magnetic yoke cup 42.

[0035] Referring to Figure 5, the magnetic yoke cup 42 further has a connecting groove 422 located between a plurality of housing grooves 421, which connects the plurality of housing grooves 421, and the width of the connecting groove 422 is smaller than the diameter of the housing grooves 421 and smaller than the outer diameter of the magnet assembly 43. The magnetic yoke cup 42 has a base plate 423, a plurality of arc-shaped side plates 424 extending upward from the base plate 423, and a connecting plate 425, the arc-shaped side plates 424 extending along an arc, the central angle of the arc being between 270 degrees and less than 360 degrees, and further between 315 degrees and 350 degrees. Correspondingly, in a top view, the voice coil 3 and magnetic gap 41 are annular, and the magnet assembly 43 is circular. The connecting plate 425 connects adjacent arc-shaped side plates 424, each arc-shaped side plate 424 surrounds one housing groove 421, and the two housing grooves 421 are connected by one communication groove 422, improving the heat dissipation performance of the speaker, simplifying assembly, reducing the number of jigs, and ensuring good structural stability. Furthermore, the communication groove 422 is surrounded by two connecting plates 425, and the communication groove 422 is a straight groove, with a portion of the magnetic gap 41 located between the arc-shaped side plate 424 and the magnet assembly 43.

[0036] Referring to Figure 4, the damper 5 is fixedly connected to the frame 1, the upper end of the connecting frame 6 is fixedly connected to the diaphragm 2, and the lower end of the connecting frame 6 is fixedly connected to the damper 5. There are two dampers 5, and they are installed symmetrically. Multiple voice coils 3 or magnetic circuit mechanisms 4 are located between the two dampers 5. Each damper 5 has an outer edge 51 fixedly connected to the frame 1 and an inner edge 52 that is close to the voice coils 3 or magnetic circuit mechanisms 4. The shape of the outer edge 51 is arc-shaped or part of a rounded rectangle, and the lower end of the connecting frame 6 is fixedly connected to the inner edge 52 of the damper 5.

[0037] Referring to Figure 1, a pair of soldering tabs 7 are provided on the frame 1, one lead wire 31 of each voice coil 3 is connected to one soldering tab 7, and the other lead wire 31 of each voice coil 3 is connected to the other soldering tab 7, so that multiple voice coils 3 are connected to each other in series or in parallel. The wire harness assembly 10 includes a cable 101 and a connector 102 connected to the cable 101, where one cable 101 is connected to one soldering tab 7 and the other cable 101 is connected to the other soldering tab 7, and the connector 102 is connected to a power amplifier or audio processing chip and is used to connect a sound source to be played back.

[0038] Furthermore, frame 1 includes a first frame 11 and a second frame 12 stacked on top of each other, and the first frame 11 and the second frame 12 as a whole have a rectangular parallelepiped shape, so that the speaker is also rectangular parallelepiped, and can be easily installed in a car without occupying excessive space inside the vehicle. Magnetic circuit mounting holes 111 are provided on the first frame 11 and the second frame 12, and the magnetic yoke cup 42 is installed in the magnetic circuit mounting hole 111 and fixedly connected to the hole wall of the magnetic circuit mounting hole 111.

[0039] The first frame 11 has a hollow region 112, the outer edge 51 of the damper is fixedly connected to the lower surface of the first frame 11, the inner edge 52 of the damper is fixedly connected to the lower end of the connecting frame 6, the connecting frame 6 penetrates the hollow region 112 and its upper end is fixedly connected to the diaphragm 2. Specifically in this embodiment, there are two connecting frames 6, which are symmetrically distributed on both the left and right sides of the speaker, and the first frame 11 is provided with two corresponding hollow regions 112.

[0040] Ventilation holes 121 are provided on the second frame 12, and the multimagnetic circuit speaker further includes a sound-absorbing and breathable fabric 9 that covers the ventilation holes 121, and the sound-absorbing and breathable fabric 9 is fixed to the outer or inner surface of the second frame 12. The sound-absorbing and breathable fabric 9 is a woven material and has a certain sound-absorbing and breathable effect.

[0041] A conventional small speaker with a single magnetic circuit structure is considered proportional. The sound generation performance of the multi-magnetic circuit speaker described in the embodiment and the proportional small speaker with a single magnetic circuit structure are compared. Figures 6 and 7 show a comparison of the frequency response curve and distortion curve, respectively. The small speaker with a single magnetic circuit structure described above employs a single magnetic circuit mechanism having one voice coil and one magnetic gap, and is otherwise the same as the embodiment. As can be seen from the frequency response curve in Figure 6, in the range from 200 Hz to 5 kHz, the curve of the embodiment is clearly flatter than that of the proportional, and its performance is superior, resulting in better sound perception. As can be seen from the distortion curve in Figure 7, the distortion of the embodiment is clearly lower than that of the proportional.

[0042] The multi-magnetic circuit speaker of this embodiment solves the problem of having a wide frequency band for both low and high frequencies, exhibits good distortion, and at the same time, the dual magnetic circuit structure design provides greater structural stability, is advantageous for heat dissipation, and results in superior speaker performance.

[0043] As provided herein and in the claims, the terms “includes” and “inclusion” merely indicate that clearly identified steps and elements are included, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0044] Those skilled in the art will understand that, unless otherwise specified, the singular forms "one," "the said," and "the said" used herein may also include plural forms. Furthermore, they will understand that "plural" in this disclosure refers to two or more, and the same applies to other quantifiers.

[0045] Furthermore, while terms such as "first" and "second" are used to describe various types of information, it should be understood that this information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate any particular order or importance. In fact, expressions such as "first" and "second" can be used completely interchangeably. For example, without departing from the scope of this disclosure, first information can be called second information, and similarly, second information can be called first information.

[0046] Unless otherwise expressly provided and limited in this disclosure, the presence of a first feature "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features without direct contact, but through another feature between them. Furthermore, the presence of a first feature "above," "above," and "on the top surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or simply indicating that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," and "on the bottom surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0047] The above embodiments are for illustrative purposes only, to illustrate the technical ideas and features of the present disclosure, and are preferred embodiments, whose purpose is to enable those skilled in the art to understand and implement the contents of the present disclosure, and not to limit the scope of protection of the present disclosure.

Claims

1. It is a multi-magnetic circuit speaker, Frame and, A diaphragm having an outer edge connected to the upper end of the frame, Multiple voice coils, each with an upper end connected to the diaphragm, A magnetic circuit mechanism having multiple magnetic gaps, Equipped with, Each voice coil corresponds to one of the plurality of magnetic gaps and is inserted therein. The magnetic circuit mechanism includes a magnetic yoke cup connected to the frame and a plurality of magnet assemblies provided within the magnetic yoke cup, wherein the magnetic yoke cup has a plurality of housing grooves, one of the magnet assemblies provided within each housing groove, a magnetic gap is formed between the side wall of each housing groove and the outer surface of the magnet assembly located within the housing groove, and the magnetic yoke cup further has a communication groove located between the plurality of housing grooves and connecting the plurality of housing grooves.

2. The multimagnetic circuit speaker according to claim 1, wherein the magnetic yoke cup comprises a bottom plate, a plurality of arc-shaped side plates extending upward from the bottom plate, and connecting plates connecting adjacent arc-shaped side plates, each arc-shaped side plate encloses one of the housing grooves, the communication groove is enclosed by two or more of the connecting plates, and a portion of the magnetic gap is located between the arc-shaped side plates and the magnet assembly.

3. The multimagnetic circuit speaker according to claim 2, characterized in that the width of the communication groove is smaller than the diameter of the housing groove.

4. The multimagnetic circuit speaker according to claim 2 or 3, characterized in that the arc-shaped side plate extends along the arc, and the central angle of the arc is 270 degrees or more and less than 360 degrees.

5. A multimagnetic circuit speaker according to any one of claims 2 to 4, characterized in that the two arc-shaped side plates are connected by the two connecting plates, the two housing grooves are connected by the one communication groove, and the communication groove is a straight groove.

6. The multimagnetic circuit speaker further comprises a damper and a connecting frame, wherein the damper is fixedly connected to the frame, the upper end of the connecting frame is fixedly connected to the diaphragm, and the lower end of the connecting frame is fixedly connected to the damper, as described in any one of the preceding paragraphs.

7. The multi-magnetic circuit speaker according to claim 6, characterized in that the number of dampers is multiple and they are installed symmetrically, the multiple voice coils or magnetic circuit mechanisms are located between the multiple dampers, each damper has an outer edge fixedly connected to the frame and an inner edge adjacent to the voice coil or magnetic circuit mechanism, and the lower end of the connecting frame is fixedly connected to the inner edge of the damper.

8. A multi-magnetic circuit speaker according to any one of the preceding paragraphs, characterized in that a pair of soldering tabs are provided on the frame, one lead wire of each voice coil is connected to one of the pair of soldering tabs, the other lead wire of each voice coil is connected to the other soldering tab, and the multiple voice coils are connected to each other in series or in parallel.

9. The multi-magnetic circuit speaker according to any one of the above-mentioned items, wherein the frame includes a first frame and a second frame stacked on top of each other, magnetic circuit mounting holes are provided on the first frame and the second frame, and the magnetic yoke cup is installed in the magnetic circuit mounting hole and fixedly connected to the hole wall of the magnetic circuit mounting hole.

10. The multimagnetic circuit speaker according to claim 9, further comprising a damper and a connecting frame, wherein the first frame has a hollow region, the outer edge of the damper is fixedly connected to the lower surface of the first frame, the inner edge of the damper is fixedly connected to the lower end of the connecting frame, the connecting frame penetrates the hollow region, and its upper end is fixedly connected to the diaphragm.

11. The multimagnetic circuit speaker according to claim 9, characterized in that ventilation holes are provided on the second frame, the multimagnetic circuit speaker further comprises a sound-absorbing and ventilating cloth covering the ventilation holes, and the sound-absorbing and ventilating cloth is fixed to the outer or inner surface of the second frame.

12. The multi-magnetic circuit speaker according to any one of the above-mentioned claims, characterized in that the magnetic circuit mechanism includes a single magnetic yoke cup.

13. A car audio system characterized by including a multi-magnetic circuit speaker as described in any one of claims 1 to 12.

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