Loudspeaker having double cones and assembly method therefor, and car audio system

Abstract

Disclosed are a loudspeaker having dual cones, an assembly method therefor, and an automotive audio system. The loudspeaker includes a frame, a first cone, a first voice coil connected to the first cone, a first magnetic circuit for driving the first voice coil, a second cone, a second voice coil connected to the second cone and a second magnetic circuit for driving the second voice coil. A back face of the first cone and a back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit.

Description

RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. CN 2023114222374 filed on October 31, 2023, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the field of loudspeakers, and in particular, to a loudspeaker having dual cones, an assembly method therefor, and an automotive audio system.BACKGROUND

[0003] An automotive audio system is installed on an automobile and has a function of reproducing sound. A main component of an automotive audio system is the loudspeaker, which generally includes a tweeter, a mid-range speaker, a woofer, and a subwoofer. For a loudspeaker or a subwoofer installed on an automobile, reducing the space it occupies has always been one of the goals of automotive audio system designers. However, existing subwoofers require a relatively large cavity to meet the sound production requirements for mid and low band frequencies.

[0004] For example, as disclosed in patent CN203047053U, in a mounting structure of a subwoofer, the subwoofer is mounted on the left or right side of the trunk floor of the vehicle, and the subwoofer comprises a box and a loudspeaker, with the loudspeaker being mounted inside the box, and a through hole being formed on an upper plate of the box to enable the sound of the loudspeaker to be emitted outwardly through the through hole. The box comprises a lower plate, an upper plate, two side plates and two end plates, wherein the two side plates are respectively fixedly connected to the lower plate and the upper plate, and the two end plates are fixedly connected to the lower plate, the upper plate, and the two side plates, such that the lower plate, the upper plate, the two side plates, and the two end plates form an enclosed cavity. The box of such a subwoofer occupies a relatively large space, and its requirements for the installation position are quite stringent, mostly requiring placement in relatively large interior spaces such as the trunk or armrest console.SUMMARY

[0005] The present disclosure relates to a loudspeaker having dual cones, which achieves a function of a subwoofer without additionally configuring a box, thereby enhancing the bass and saving occupied space. The present disclosure also provides an assembly method for a loudspeaker having dual cones. The present disclosure further relates to an automotive audio system in which the subwoofer does not require an additionally provided box, occupies a small space, and is assembled in the automobile in a relatively flexible manner.

[0006] A first aspect of the present disclosure provides a loudspeaker having dual cones, including: a frame being hollow and comprising a first end portion and a second end portion opposite to each other; a first cone with an outer edge connected to the first end portion, and the first cone having a front face and a back face; a first voice coil connected to the first cone; a first magnetic circuit for driving the first voice coil to reciprocate along a movement axis, and a first magnetic gap for the first voice coil to be inserted into being formed inside the first magnetic circuit; a second cone, with an outer edge connected to the second end portion, and the second cone comprising a front face and a back face; a second voice coil connected to the second cone; and a second magnetic circuit for driving the second voice coil to reciprocate along the movement axis, and a second magnetic gap for the second voice coil to be inserted into being formed inside the second magnetic circuit; wherein the back face of the first cone and the back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit.

[0007] The loudspeaker has at least one of the following features: by providing two magnetic circuits, with a magnetic shielding material provided between the two magnetic circuits, and with each magnetic circuit independently forming a magnetic gap to independently drive the two voice coils, thereby achieving vibration of the two cones and realizing an effect of enhancing deep bass, so as to have a function similar to that of a subwoofer; by using an integrally formed frame, it is convenient to assemble the magnetic circuits, that is, after the first magnetic circuit is fixed on the inner cylinder and after the assembling of the voice coil and cone corresponding to the first magnetic circuit is completed, the frame can be turned upside down, and then the second magnetic circuit can be placed in the mounting hole of the first magnetic circuit, and then the assembling of the voice coil and cone corresponding to the first magnetic circuit is completed; the assembly is convenient and easy to implement, and the structure itself is compact, reducing the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation; or by arranging vent holes on the outer cylinder of the frame, with a first airflow hole being provided on the first voice coil to communicate the spaces inside and outside of the first voice coil, and a second airflow hole being provided on the second voice coil to communicate the spaces inside and outside of the second voice coil, the entire inner cavity within the frame can communicate with the outside to allow airflow exchange, thereby avoiding large distortion caused at a certain frequency due to the airflow sound in the enclosed cavity, and this arrangement of the present application is conducive to heat dissipation and helps reduce distortion, especially for the loudspeaker of the present application which requires a relatively large driving force, where heat dissipation is of particular concern.

[0008] In one embodiment, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; the first voice coil, the first magnetic circuit, the second voice coil and the second magnetic circuit are all positioned in the chamber.

[0009] In one embodiment, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; a vent hole for communicating the chamber with outside air is provided on a side wall of the frame.

[0010] In one embodiment, the first magnetic circuit comprises a first magnetic bowl, and a first magnet and a first front panel disposed in the first magnetic bowl, wherein through holes are respectively provided at a bottom of the first magnetic bowl and in at least one first magnet, and the through holes are aligned to form all or a part of the mounting groove; a diameter of the first voice coil is greater than a diameter of the second voice coil, and an diameter of the through holes is greater than the diameter of the second voice coil and smaller than the diameter of the first voice coil.

[0011] In one embodiment, the through holes are respectively provided at the bottom of the first magnetic bowl, in the first front panel, and in all first magnets, and the respective through holes are aligned to form the mounting groove.

[0012] In one embodiment, the second magnetic circuit is disposed in the through hole of the first magnetic bowl and the through hole of at least one first magnet.

[0013] In one embodiment, a magnetic shielding material is arranged between the second magnetic circuit and the first front panel.

[0014] In one embodiment, there are two first magnets, the first front panel is located between the two first magnets, there are two second magnets, and the second front panel is located between the two second magnets.

[0015] In one embodiment, a magnetic shielding material is provided between the first magnetic circuit and the second magnetic circuit.

[0016] In one embodiment, a first airflow hole is provided on the first voice coil to communicate the spaces inside and outside of the first voice coil; a second airflow hole is provided on the second voice coil to communicate the spaces inside and outside of the second voice coil.

[0017] In one embodiment, the first voice coil is fixedly connected to the first cone via a first bracket, the first bracket has a top portion attached to the back face of the first cone and a first flange extending downwardly from the top portion, and a top of the first voice coil is sleeved on the first flange and fixedly connected thereto; the second voice coil is fixedly connected to the second cone via a second bracket, the second bracket has a bottom portion attached to the back face of the second cone and a second flange extending upwardly from the bottom portion, and a bottom of the second voice coil is sleeved on the second flange and fixedly connected thereto.

[0018] In one embodiment, the loudspeaker further comprises a first positioning spider, an inner edge of the first positioning spider is fixed on the first voice coil and an outer edge of the first positioning spider is fixed on the frame; the loudspeaker further comprises a second positioning spider, an inner edge of the second positioning spider is fixed on the second voice coil and an outer edge of the second positioning spider is fixed on the frame.

[0019] In one embodiment, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, and one or more vent holes are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of spaced-apart connecting ribs, the first magnetic circuit is fixedly disposed in the inner cylinder, and the outer edge of the first positioning spider and the outer edge of the second positioning spider are respectively connected to two end portions of the inner cylinder; a diameter of an upper end portion of the inner cylinder is greater than a diameter of a lower end portion thereof.

[0020] In one embodiment, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; one or more vent holes communicating the chamber with outside air are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, and the first magnetic circuit is fixedly disposed in the inner cylinder; a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil, and a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil.

[0021] In one embodiment, a first interface and a second interface are provided on the frame; leads of the first voice coil is electrically connected to the first interface, and leads of the second voice coil is electrically connected to the second interface.

[0022] In one embodiment, a first interface and a second interface are provided on the frame; a positive lead of the first voice coil and a positive lead of the second voice coil are electrically connected to the first interface, and a negative lead of the first voice coil and a negative lead of the second voice coil are electrically connected to the second interface.

[0023] In one embodiment, a first interface and a second interface are provided on the frame, and a lead of the first voice coil and a lead of the second voice coil are connected in series and then connected between the first interface and the second interface.

[0024] In one embodiment, the first cone comprises a flat plate-shaped first cone body, the second cone comprises a flat plate-shaped second cone body, the first cone body and the second cone body are parallel to each other, and are both perpendicular to the movement axis in an initial state.

[0025] A second aspect of the present disclosure provides an assembly method for the loudspeaker, including the following steps: mounting the first magnetic circuit in an inner cylinder of the frame; fixing the first voice coil to the first cone; inserting the first voice coil into the first magnetic gap of the first magnetic circuit, and fixing the outer edge of the first cone to the first end portion of an outer cylinder of the frame; turning the frame upside down, and placing the second magnetic circuit in the mounting groove of the first magnetic circuit; fixing the second voice coil to the second cone; inserting the second voice coil into the second magnetic gap of the second magnetic circuit, and fixing the outer edge of the second cone to the second end portion of the outer cylinder of the frame.

[0026] A third aspect of the present disclosure provides an automotive audio system, including a subwoofer, wherein the subwoofer includes the above loudspeaker.

[0027] The loudspeaker having dual cones of the present disclosure including two vibration systems, and the two magnetic circuits are nested within each other, achieving an enhanced effect of deep bass and functionality similar to that of a subwoofer, exhibiting excellent performance in the low-band-frequency range while not requiring an additionally configured box, and itself having a compact structure that reduces the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the present disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings may be obtained based on these drawings without the exercise of inventive effort. FIG. 1 is an exploded view of a loudspeaker according to an embodiment of the present disclosure. FIG. 2 is a top view of a loudspeaker according to an embodiment of the present disclosure. FIG. 3 is a cross-sectional view along the line A-A in FIG. 2. FIG. 4 is a schematic view of a half of the structure of a loudspeaker according to an embodiment of the present disclosure. FIG. 5 is an enlarged partial view of portion A in FIG. 4. FIG. 6 is an enlarged partial view of portion B in FIG. 4. FIG. 7 is a schematic view of a half of the frame of a loudspeaker according to an embodiment of the present disclosure. FIG. 8 is a schematic diagram of cone vibration of the loudspeaker according to Embodiment 1 of the present disclosure. FIG. 9 is a schematic diagram of cone vibration of the loudspeaker according to Embodiment 2 of the present disclosure. FIG. 10 shows performance test curves of three kinds of loudspeakers.

[0029] Reference signs, 1 - frame; 11 - outer cylinder; 110 - vent hole; 111 - first interface; 112 - second interface; 12 - inner cylinder; 13 - connecting rib; 2 - first cone; 21 - first cone body; 22 - first bracket; 221 - first flange; 3 - first voice coil; 31 - first airflow hole; 32 - first lead; 4 - first magnetic circuit; 40 - first magnetic gap; 41 - first magnetic bowl; 42 - first magnet; 43 - first front panel; 44 - mounting groove; 440 - through hole; 5 - first positioning spider; 6 - second cone; 61 - second cone body; 62 - second bracket; 621 - second flange; 7 - second voice coil; 71 - second airflow hole; 72 - second lead; 721 - second flange; 8 - second magnetic circuit; 80 - second magnetic gap; 81 - second magnetic bowl; 82 - second magnet; 83 - second front panel; 9 - second positioning spider; 10 - magnetic shielding material. DETAILED DESCRIPTION

[0030] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is intended to help understand the present disclosure, but is not intended to limit the present disclosure. In addition, the technical features involved in the respective embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0031] In the present disclosure, "inner" and "outer" are defined with reference to a centerline of the voice coil, with orientations closer to the centerline of the voice coil being inner and the opposite being outer. The orientation terms "upper," "lower," and "horizontal" are intended to facilitate the understanding of the structure of the loudspeaker system by those skilled in the art, and are not used to limit the state of the loudspeaker after it is installed in a use scenario. For example, the loudspeaker may be installed on a horizontal surface, an inclined surface, or a vertical surface on an automobile.

[0032] The present embodiment provides a loudspeaker having dual cones, which is capable of realizing the function of a subwoofer with a relatively small volume and has a sound effect of enhanced deep bass. FIG. 1 to FIG. 8 show an example of a loudspeaker having dual cones. Referring to FIG. 1 to FIG. 8, the loudspeaker comprises a frame 1 and two vibration systems mounted in the frame 1. The first vibration system comprises a first cone 2, a first voice coil 3, a first magnetic circuit 4, and a first positioning spider 5, and the second vibration system comprises a second cone 6, a second voice coil 7, a second magnetic circuit 8, and a second positioning spider 9. Both vibration systems can vibrate and emit sound after being fed with an electrical signal, and the second magnetic circuit 8 is disposed within the first magnetic circuit 4.

[0033] The frame 1 is hollow and has a first end portion and a second end portion that are opposite to each other, with the first vibration system disposed at the first end portion of the frame 1 and the second vibration system disposed at the second end portion of the frame 1. As shown in FIG. 6 and FIG. 7, the frame 1 comprises an outer cylinder 11 and an inner cylinder 12, and the inner cylinder 12 is connected to the inner wall of the outer cylinder 11 via a plurality of spaced-apart connecting ribs 13. The outer cylinder 11 as a whole is a hollow cylindrical shape, and the inner cylinder 12 has a tapered portion with a larger upper portion and a smaller lower portion, wherein the diameter of the upper end portion of the inner cylinder 12 is greater than the diameter of the lower end portion thereof. The plurality of connecting ribs 13 are arranged at equal intervals along the circumferential direction of the inner cylinder 12, and are connected radially between the outer cylinder 11 and the inner cylinder 12. There are gaps between the plurality of connecting ribs 13, the inner cylinder 12 is entirely located within the outer cylinder 11, the height of the inner cylinder 12 is less than the height of the outer cylinder 11, and the outer diameter of the inner cylinder 12 is less than the inner diameter of the outer cylinder 11. One or more vent holes 110 are provided on the outer cylinder 11 to communicate the space inside the frame 1 with the outside atmosphere.

[0034] As shown in FIG. 3 and FIG. 4, the outer edge of the first cone 2 is fixedly connected to the first end portion of the frame 1 and seals the first end portion of the frame 1. Specifically, the outer edge of the first cone 2 is fixedly connected to the top end of the outer cylinder 11 of the frame 1. The first cone 2 has a front face and a back face, with the front face facing the outside of the frame 1 and the back face facing the inside of the frame 1, specifically facing the top end of the inner cylinder 12. Further, the first cone 2 has a flat plate-shaped first cone body 21. The outer edge of the second cone 6 is fixedly connected to the second end portion of the frame 1 and seals the second end portion of the frame 1. Specifically, the outer edge of the second cone 6 is fixedly connected to the bottom end of the outer cylinder 11 of the frame 1. The second cone 6 has a front face and a back face, with the front face facing the outside of the frame 1 and the back face facing the inside of the frame 1, specifically facing the bottom end of the inner cylinder 12. Further, the second cone 6 has a flat plate-shaped second cone body 61. The back face of the first cone 2 and the back face of the second cone 6 are disposed opposite each other, the first cone body 21 and the second cone body 61 are parallel to each other, and the inner cylinder 12 is located between the first cone 2 and the second cone 6. The first cone body 21 and the second cone body 61 are both perpendicular to the movement axis of the first voice coil 3 and / or the second voice coil 7 (specifically, the up-down direction in FIG. 3) in an initial state.

[0035] The first voice coil 3 is connected to the first cone 2, and the first voice coil 3 has a pair of first leads 32 (including a positive pole and a negative pole) for receiving audio signals. Specifically, as shown in FIG. 5, the top end of the first voice coil 3 is fixedly connected to the middle portion of the first cone 2 via a first bracket 22, the first bracket 22 has a top portion attached to the back face of the first cone 2 and a first flange 221 extending downwardly from the top portion, and the top of the first voice coil 3 is sleeved outside the first flange 221 and fixedly connected thereto, specifically by being adhered to the outer side surface of the first flange 221 with glue. The second voice coil 7 is connected to the second cone 6, and the second voice coil 7 has a pair of second leads 72 (including a positive pole and a negative pole) for receiving audio signals. Specifically, as shown in FIG. 6, the bottom end of the second voice coil 7 is fixedly connected to the middle portion of the second cone 6 via a second bracket 62, the second bracket 62 has a bottom portion attached to the back face of the second cone 6 and a second flange 621 extending upwardly from the bottom portion, and the bottom of the second voice coil 7 is sleeved outside the second flange 621 and fixedly connected thereto, specifically by being adhered to the outer side surface of the second flange 621 with glue. The diameter of the first voice coil 3 is greater than the diameter of the second voice coil 7.

[0036] As shown in FIG. 3 and FIG. 4, the first magnetic circuit 4 is disposed between the first cone 2 and the second cone 6, and the first magnetic circuit 4 is connected to the frame 1, specifically disposed on the inner cylinder 12 of the frame 1. The first magnetic circuit 4 is used to drive the first voice coil 3 to reciprocate along a movement axis, and the bottom end of the first voice coil 3 is inserted into the first magnetic gap 40 of the first magnetic circuit 4 from above. The first magnetic circuit 4 comprises a first magnetic bowl 41, and a first magnet 42 and a first front panel 43 disposed in the first magnetic bowl 41. The first magnetic bowl 41 is fixedly placed on the inner cylinder 12 and has a cavity with an open top end, and the first magnets 42 (of which there may be multiple) and the first front panel 43 are stacked and fixed to each other and fixed to the bottom wall of the first magnetic bowl 41. The first magnetic gap 40 is formed between the inner side surface of the first magnetic bowl 41 and the outer side surfaces of the first magnet 42 and the first front panel 43.

[0037] The second magnetic circuit 8 is used to drive the second voice coil 7 to reciprocate along the above-mentioned movement axis, and the top portion of the second voice coil 7 is inserted into the second magnetic gap 80 of the second magnetic circuit 8 from below. The second magnetic circuit 8 comprises a second magnetic bowl 81, and a second magnet 82 and a second front panel 83 disposed in the second magnetic bowl 81. The second magnetic bowl 81 has a cavity with an open bottom end, and the second magnet 82 and the first front panel 43 are stacked and fixed to each other and fixed to the top wall of the first magnetic bowl 41. The second magnetic gap 80 is formed between the inner side surface of the second magnetic bowl 81 and the outer side surfaces of the second magnet 82 and the second front panel 83.

[0038] The second magnetic circuit 8 is nested in the first magnetic circuit 4. Specifically, a mounting groove 44 is provided in the first magnetic circuit 4, and the second magnetic circuit 8 is disposed in the mounting groove 44 of the first magnetic circuit 4. Further, as shown in FIG. 3, FIG. 4, and FIG. 6, a through hole 440 is provided at the bottom of the first magnetic bowl 41 and in at least one first magnet 42, and the through holes 440 are aligned to form all or a part of the mounting groove 44. Further, through holes 440 are provided at the bottom of the first magnetic bowl 41, in the first front panel 43, and in all of the first magnets 42, and the respective through holes 440 are aligned to form the above-mentioned mounting groove 44, and the second magnetic circuit 8 is disposed within the through hole 440 of the first magnetic bowl 41 and the through hole 440 of at least one first magnet 42. The diameter of the first voice coil 3 is greater than the diameter of the second voice coil 7, and the aperture of the through hole 440 must be greater than the diameter of the second voice coil 7 and smaller than the diameter of the first voice coil 3.

[0039] A magnetic shielding material 10 is provided between the first magnetic circuit 4 and the second magnetic circuit 8. Specifically, in the present embodiment, the magnetic shielding material 10 is provided between the second magnetic circuit 8 and the first front panel 43. The magnetic shielding material 10 is selected from one or more combinations of plastic (such as PC), rubber, iron, cobalt, nickel, and aluminum. The magnetic shielding material 10 is provided at least on the top of the second magnetic circuit 8 to prevent the magnetic fields of the first magnetic circuit 4 and the second magnetic circuit 8 from influencing each other.

[0040] The inner edge of the first positioning spider 5 is fixed on the first voice coil 3, and the outer edge thereof is fixed on the frame 1. Specifically, the outer edge of the first positioning spider 5 is fixedly connected to the top end of the inner cylinder 12. The inner edge of the second positioning spider 9 is fixed on the second voice coil 7, and the outer edge thereof is fixed on the frame 1. Specifically, the outer edge of the second positioning spider 9 is fixedly connected to the bottom end of the inner cylinder 12. The first positioning spider 5 and the second positioning spider 9 are corrugated and elastic. The first positioning spider 5 and the second positioning spider 9 prevent the first voice coil 3 and the second voice coil 7 from shaking in directions other than the expected direction, and limit the first voice coil 3 and the second voice coil 7 to vibrate up and down substantially along the above-mentioned movement axis.

[0041] The first end portion of the frame 1 is closed by the first cone 2, and the second end portion is closed by the second cone 6, so as to form a chamber inside the frame 1. The first voice coil 3, the first magnetic circuit 4, the second voice coil 7, and the second magnetic circuit 8 are all located in this chamber, and the chamber communicates with the outside air through the plurality of vent holes 110 on the side wall of the outer cylinder 11 of the frame 1. Further, a first airflow hole 31 is provided on the first voice coil 3 to communicate the spaces inside and outside of the first voice coil 3; a second airflow hole 71 is provided on the second voice coil 7 to communicate the spaces inside and outside of the second voice coil 7.

[0042] A first interface 111 and a second interface 112 are provided on the outer cylinder 11 of the frame 1, which may be configured in the form of female connectors. The pair of leads of the first voice coil 3 may be respectively connected to a pair of solder tabs of the first interface 111, and the pair of leads of the second voice coil 7 may be respectively connected to a pair of solder tabs of the second interface 112. During operation, an audio signal can be selectively fed to one or both of the first voice coil 3 and the second voice coil 7, and a corresponding operating mode can be selected according to needs to achieve different playback effects; when both voice coils are operating, the first voice coil 3 and the second voice coil 7 are connected in parallel with each other, and may also be connected in series with each other. In certain other embodiments, the following lead connection mode may also be adopted: the positive lead of the first voice coil 3 and the positive lead of the second voice coil 7 are electrically connected and then connected to the first interface 111, and the negative lead of the first voice coil 3 and the negative lead of the second voice coil 7 are electrically connected and then connected to the second interface 112, that is, the first voice coil 3 and the second voice coil 7 are connected in parallel with each other. As shown in FIG. 8, after an audio signal is fed in, the first cone 2 and the second cone 6 vibrate up and down along the same movement axis, respectively, and their vibration directions are as shown by the two arrows in FIG. 8, with the first cone 2 and the second cone 6 vibrating synchronously and in opposite directions.

[0043] The present embodiment further provides an assembly method for the above loudspeaker, comprising the following steps: mounting the first magnetic circuit 4 in the inner cylinder 12 of the frame 1; fixing the first voice coil 3 to the first cone 2; inserting the first voice coil 3 into the first magnetic gap 40 of the first magnetic circuit 4, and fixing the outer edge of the first cone 2 on the first end portion of the outer cylinder 11 of the frame 1; turning the frame 1 upside down, and placing the second magnetic circuit 8 in the mounting groove 44 of the first magnetic circuit 4; fixing the second voice coil 7 to the second cone 6; inserting the second voice coil 7 into the second magnetic gap 80 of the second magnetic circuit 8, and fixing the outer edge of the second cone 6 on the second end portion of the outer cylinder 11 of the frame 1.

[0044] The present embodiment further provides an automotive audio system comprising a subwoofer. The subwoofer employs the above-mentioned loudspeaker, and the loudspeaker is directly assembled inside the automobile, for example, the frame 1 of the loudspeaker may be locked to a sheet metal part of the automobile by screws, without requiring an additionally configured box body.

[0045] FIG. 9 shows an example of another loudspeaker according to the present embodiment, in which the lead connection mode of the first voice coil 3 and the second voice coil 7 is different. Specifically, the first voice coil 3 and the second voice coil 7 are connected in series with each other. That is, the positive lead of the first voice coil 3 and the negative lead of the second voice coil 7 are electrically connected, and the negative lead of the first voice coil 3 and the positive lead of the second voice coil 7 are respectively electrically connected to audio input lines to receive audio signals. Alternatively, the negative lead of the first voice coil 3 and the positive lead of the second voice coil 7 are electrically connected, and the positive lead of the first voice coil 3 and the negative lead of the second voice coil 7 are respectively electrically connected to audio input lines to receive audio signals. As shown in FIG. 9, after an audio signal is fed in, the first cone 2 and the second cone 6 vibrate up and down along the same movement axis, respectively, and their vibration directions are as shown by the two arrows in FIG. 9, with the first cone 2 and the second cone 6 vibrating synchronously and in the same direction.Performance test:

[0046] Performance tests were carried out on the dual-cone loudspeaker shown in FIG. 1 to FIG. 8, a conventional bass speaker, and a conventional subwoofer, and the performance curves are shown in FIG. 10. The volume of the dual-cone loudspeaker shown in FIG. 1 to FIG. 8 is 1.64×10 6< mm 3< , the volume of the conventional bass speaker is 1.58×10 6< mm 3< , and the volume of the subwoofer is 1.4×10 7< mm 3< .

[0047] As can be seen from the frequency response curves of FIG. 10, in the low-frequency range of 40 to 100 Hz, the SPL (sound pressure level) of the dual-cone loudspeaker shown in FIG. 1 to FIG. 8 is significantly better than that of the conventional bass speaker, and is on average 2 to 3 dB higher than the SPL (sound pressure level) of the conventional subwoofer. Moreover, compared with a conventional bass speaker, which can mostly only be assembled on an automobile door panel, and a subwoofer, which can mostly only be installed in the trunk, the dual-cone loudspeaker of the present embodiment has relatively few restrictions on its installation position and can be configured on the automobile relatively flexibly.

[0048] The dual-cone loudspeaker of the present embodiment employs two vibration systems, and the two magnetic circuits are nested within each other, providing an enhanced effect of deep bass and functionality similar to that of a subwoofer, exhibiting excellent performance in the low-frequency range while not requiring an additionally configured box, and itself having a compact structure that reduces the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation.

[0049] The features of the embodiments of the present disclosure are set forth in the following clauses: 1. A loudspeaker having dual cones, comprising: a frame being hollow and comprising a first end portion and a second end portion opposite to each other; a first cone with an outer edge connected to the first end portion, and the first cone having a front face and a back face; a first voice coil connected to the first cone; a first magnetic circuit for driving the first voice coil to reciprocate along a movement axis; a second cone with an outer edge connected to the second end portion, and the second cone having a front face and a back face; a second voice coil connected to the second cone; and a second magnetic circuit for driving the second voice coil to reciprocate along the movement axis; wherein the back face of the first cone and the back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit. 2. The loudspeaker according to clause 1, wherein the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; the first voice coil, the first magnetic circuit, the second voice coil and the second magnetic circuit are all positioned in the chamber; a vent hole for communicating the chamber with outside air is provided on a side wall of the frame. 3. The loudspeaker according to clause 1, wherein the first magnetic circuit comprises a first magnetic bowl, and a first magnet and a first front panel disposed in the first magnetic bowl, wherein through holes are provided at a bottom of the first magnetic bowl and in at least one of the first magnets, and the through holes are aligned to form all or a part of the mounting groove; a diameter of the first voice coil is greater than a diameter of the second voice coil, and a diameter of the through hole is greater than the diameter of the second voice coil and smaller than the diameter of the first voice coil. 4. The loudspeaker according to clause 3, wherein through holes are respectively provided at the bottom of the first magnetic bowl, in the first front panel, and in all first magnets, and the through holes are respectively aligned to form the mounting groove. 5. The loudspeaker according to clause 3 or 4, wherein the second magnetic circuit is disposed in the through hole of the first magnetic bowl and the through hole of at least one first magnet. 6. The loudspeaker according to clause 5, wherein a magnetic shielding material is provided between the second magnetic circuit and the first front panel. 7. The loudspeaker according to clause 1, wherein a magnetic shielding material is provided between the first magnetic circuit and the second magnetic circuit. 8. The loudspeaker according to clause 1, wherein a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil; a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil. 9. The loudspeaker according to clause 1, wherein the first voice coil is fixedly connected to the first cone via a first bracket, the first bracket has a top portion attached to the back face of the first cone and a first flange extending downwardly from the top portion, and a top of the first voice coil is sleeved on the first flange and fixedly connected thereto; the second voice coil is fixedly connected to the second cone via a second bracket, the second bracket has a bottom portion attached to the back face of the second cone and a second flange extending upwardly from the bottom portion, and a bottom of the second voice coil is sleeved on the second flange and fixedly connected thereto. 10. The loudspeaker according to clause 1, wherein the loudspeaker further comprises a first positioning spider, an inner edge of the first positioning spider is fixed on the first voice coil and an outer edge of the first positioning spider is fixed on the frame; the loudspeaker further comprises a second positioning spider, an inner edge of the second positioning spider is fixed on the second voice coil and an outer edge of the second positioning spider is fixed on the frame. 11. The loudspeaker according to clause 10, wherein the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, and one or more vent holes are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, the first magnetic circuit is fixedly disposed in the inner cylinder, and the outer edge of the first positioning spider and the outer edge of the second positioning spider are respectively connected to two end portions of the inner cylinder; a diameter of an upper end portion of the inner cylinder is greater than a diameter of a lower end portion thereof. 12. The loudspeaker according to clause 1, wherein a first interface and a second interface are provided on the frame; leads of the first voice coil are electrically connected to the first interface, and leads of the second voice coil are electrically connected to the second interface; or, a positive lead of the first voice coil and a positive lead of the second voice coil are electrically connected to the first interface, and a negative lead of the first voice coil and a negative lead of the second voice coil are electrically connected to the second interface; or, leads of the first voice coil and leads of the second voice coil are connected in series and then connected between the first interface and the second interface. 13. The loudspeaker according to clause 1, wherein the first cone comprises a flat plate-shaped first cone body, the second cone comprises a flat plate-shaped second cone body, the first cone body and the second cone body are parallel to each other, and are both perpendicular to the movement axis in an initial state. 14. An assembly method for the loudspeaker according to any one of clauses 1 to 13, comprising the following steps: mounting the first magnetic circuit in an inner cylinder of the frame; fixing the first voice coil to the first cone; inserting the first voice coil into the first magnetic gap of the first magnetic circuit, and fixing the outer edge of the first cone to the first end portion of an outer cylinder of the frame; turning the frame upside down, and placing the second magnetic circuit in the mounting groove of the first magnetic circuit; fixing the second voice coil to the second cone; inserting the second voice coil into the second magnetic gap of the second magnetic circuit, and fixing the outer edge of the second cone to the second end portion of the outer cylinder of the frame. 15. An automotive audio system, comprising a subwoofer, wherein the subwoofer comprises the loudspeaker according to any one of clauses 1 to 13.

[0050] As shown in the present specification and claims, the terms "comprise" and "include" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0051] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms "a," "said," and "the" used herein may also include plural forms. It should further be understood that in the present disclosure, "a plurality of" refers to two or more, and other quantifiers are similar thereto.

[0052] It should further be understood that the terms "first," "second," etc. are used to describe various pieces of information, but the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other, and do not indicate a particular order or degree of importance. In fact, expressions such as "first," "second," etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

[0053] In the present disclosure, unless otherwise explicitly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but in contact through an additional feature therebetween. Moreover, a first feature being "on," "above," and "over" a second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the horizontal level of the first feature is higher than that of the second feature. A first feature being "beneath," "below," and "under" a second feature includes the first feature being directly beneath and obliquely beneath the second feature, or merely indicates that the horizontal level of the first feature is lower than that of the second feature.

[0054] The above embodiments are only intended to illustrate the technical concept and features of the present disclosure, and are preferred embodiments whose purpose is to enable those familiar with this technology to understand the contents of the present disclosure and to implement them accordingly, and cannot thereby limit the protection scope of the present disclosure.

Examples

Embodiment Construction

[0030]Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is intended to help understand the present disclosure, but is not intended to limit the present disclosure. In addition, the technical features involved in the respective embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0031]In the present disclosure, "inner" and "outer" are defined with reference to a centerline of the voice coil, with orientations closer to the centerline of the voice coil being inner and the opposite being outer. The orientation terms "upper," "lower," and "horizontal" are intended to facilitate the understanding of the structure of the loudspeaker system by those s...

RELATED APPLICATION

[0001] This application claims priority to Chinese patent application No. CN 2023114222374 filed on October 31, 2023, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the field of loudspeakers, and in particular, to a loudspeaker having dual cones, an assembly method therefor, and an automotive audio system.BACKGROUND

[0003] An automotive audio system is installed on an automobile and has a function of reproducing sound. A main component of an automotive audio system is the loudspeaker, which generally includes a tweeter, a mid-range speaker, a woofer, and a subwoofer. For a loudspeaker or a subwoofer installed on an automobile, reducing the space it occupies has always been one of the goals of automotive audio system designers. However, existing subwoofers require a relatively large cavity to meet the sound production requirements for mid and low band frequencies.

[0004] For example, as disclosed in patent CN203047053U, in a mounting structure of a subwoofer, the subwoofer is mounted on the left or right side of the trunk floor of the vehicle, and the subwoofer comprises a box and a loudspeaker, with the loudspeaker being mounted inside the box, and a through hole being formed on an upper plate of the box to enable the sound of the loudspeaker to be emitted outwardly through the through hole. The box comprises a lower plate, an upper plate, two side plates and two end plates, wherein the two side plates are respectively fixedly connected to the lower plate and the upper plate, and the two end plates are fixedly connected to the lower plate, the upper plate, and the two side plates, such that the lower plate, the upper plate, the two side plates, and the two end plates form an enclosed cavity. The box of such a subwoofer occupies a relatively large space, and its requirements for the installation position are quite stringent, mostly requiring placement in relatively large interior spaces such as the trunk or armrest console.SUMMARY

[0005] The present disclosure relates to a loudspeaker having dual cones, which achieves a function of a subwoofer without additionally configuring a box, thereby enhancing the bass and saving occupied space. The present disclosure also provides an assembly method for a loudspeaker having dual cones. The present disclosure further relates to an automotive audio system in which the subwoofer does not require an additionally provided box, occupies a small space, and is assembled in the automobile in a relatively flexible manner.

[0006] A first aspect of the present disclosure provides a loudspeaker having dual cones, including: a frame being hollow and comprising a first end portion and a second end portion opposite to each other; a first cone with an outer edge connected to the first end portion, and the first cone having a front face and a back face; a first voice coil connected to the first cone; a first magnetic circuit for driving the first voice coil to reciprocate along a movement axis, and a first magnetic gap for the first voice coil to be inserted into being formed inside the first magnetic circuit; a second cone, with an outer edge connected to the second end portion, and the second cone comprising a front face and a back face; a second voice coil connected to the second cone; and a second magnetic circuit for driving the second voice coil to reciprocate along the movement axis, and a second magnetic gap for the second voice coil to be inserted into being formed inside the second magnetic circuit; wherein the back face of the first cone and the back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit.

[0007] The loudspeaker has at least one of the following features: by providing two magnetic circuits, with a magnetic shielding material provided between the two magnetic circuits, and with each magnetic circuit independently forming a magnetic gap to independently drive the two voice coils, thereby achieving vibration of the two cones and realizing an effect of enhancing deep bass, so as to have a function similar to that of a subwoofer; by using an integrally formed frame, it is convenient to assemble the magnetic circuits, that is, after the first magnetic circuit is fixed on the inner cylinder and after the assembling of the voice coil and cone corresponding to the first magnetic circuit is completed, the frame can be turned upside down, and then the second magnetic circuit can be placed in the mounting hole of the first magnetic circuit, and then the assembling of the voice coil and cone corresponding to the first magnetic circuit is completed; the assembly is convenient and easy to implement, and the structure itself is compact, reducing the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation; or by arranging vent holes on the outer cylinder of the frame, with a first airflow hole being provided on the first voice coil to communicate the spaces inside and outside of the first voice coil, and a second airflow hole being provided on the second voice coil to communicate the spaces inside and outside of the second voice coil, the entire inner cavity within the frame can communicate with the outside to allow airflow exchange, thereby avoiding large distortion caused at a certain frequency due to the airflow sound in the enclosed cavity, and this arrangement of the present application is conducive to heat dissipation and helps reduce distortion, especially for the loudspeaker of the present application which requires a relatively large driving force, where heat dissipation is of particular concern.

[0008] In one embodiment, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; the first voice coil, the first magnetic circuit, the second voice coil and the second magnetic circuit are all positioned in the chamber.

[0009] In one embodiment, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; a vent hole for communicating the chamber with outside air is provided on a side wall of the frame.

[0010] In one embodiment, the first magnetic circuit comprises a first magnetic bowl, and a first magnet and a first front panel disposed in the first magnetic bowl, wherein through holes are respectively provided at a bottom of the first magnetic bowl and in at least one first magnet, and the through holes are aligned to form all or a part of the mounting groove; a diameter of the first voice coil is greater than a diameter of the second voice coil, and an diameter of the through holes is greater than the diameter of the second voice coil and smaller than the diameter of the first voice coil.

[0011] In one embodiment, the through holes are respectively provided at the bottom of the first magnetic bowl, in the first front panel, and in all first magnets, and the respective through holes are aligned to form the mounting groove.

[0012] In one embodiment, the second magnetic circuit is disposed in the through hole of the first magnetic bowl and the through hole of at least one first magnet.

[0013] In one embodiment, a magnetic shielding material is arranged between the second magnetic circuit and the first front panel.

[0014] In one embodiment, there are two first magnets, the first front panel is located between the two first magnets, there are two second magnets, and the second front panel is located between the two second magnets.

[0015] In one embodiment, a magnetic shielding material is provided between the first magnetic circuit and the second magnetic circuit.

[0016] In one embodiment, a first airflow hole is provided on the first voice coil to communicate the spaces inside and outside of the first voice coil; a second airflow hole is provided on the second voice coil to communicate the spaces inside and outside of the second voice coil.

[0017] In one embodiment, the first voice coil is fixedly connected to the first cone via a first bracket, the first bracket has a top portion attached to the back face of the first cone and a first flange extending downwardly from the top portion, and a top of the first voice coil is sleeved on the first flange and fixedly connected thereto; the second voice coil is fixedly connected to the second cone via a second bracket, the second bracket has a bottom portion attached to the back face of the second cone and a second flange extending upwardly from the bottom portion, and a bottom of the second voice coil is sleeved on the second flange and fixedly connected thereto.

[0018] In one embodiment, the loudspeaker further comprises a first positioning spider, an inner edge of the first positioning spider is fixed on the first voice coil and an outer edge of the first positioning spider is fixed on the frame; the loudspeaker further comprises a second positioning spider, an inner edge of the second positioning spider is fixed on the second voice coil and an outer edge of the second positioning spider is fixed on the frame.

[0019] In one embodiment, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, and one or more vent holes are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of spaced-apart connecting ribs, the first magnetic circuit is fixedly disposed in the inner cylinder, and the outer edge of the first positioning spider and the outer edge of the second positioning spider are respectively connected to two end portions of the inner cylinder; a diameter of an upper end portion of the inner cylinder is greater than a diameter of a lower end portion thereof.

[0020] In one embodiment, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; one or more vent holes communicating the chamber with outside air are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, and the first magnetic circuit is fixedly disposed in the inner cylinder; a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil, and a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil.

[0021] In one embodiment, a first interface and a second interface are provided on the frame; leads of the first voice coil is electrically connected to the first interface, and leads of the second voice coil is electrically connected to the second interface.

[0022] In one embodiment, a first interface and a second interface are provided on the frame; a positive lead of the first voice coil and a positive lead of the second voice coil are electrically connected to the first interface, and a negative lead of the first voice coil and a negative lead of the second voice coil are electrically connected to the second interface.

[0023] In one embodiment, a first interface and a second interface are provided on the frame, and a lead of the first voice coil and a lead of the second voice coil are connected in series and then connected between the first interface and the second interface.

[0024] In one embodiment, the first cone comprises a flat plate-shaped first cone body, the second cone comprises a flat plate-shaped second cone body, the first cone body and the second cone body are parallel to each other, and are both perpendicular to the movement axis in an initial state.

[0025] A second aspect of the present disclosure provides an assembly method for the loudspeaker, including the following steps: mounting the first magnetic circuit in an inner cylinder of the frame; fixing the first voice coil to the first cone; inserting the first voice coil into the first magnetic gap of the first magnetic circuit, and fixing the outer edge of the first cone to the first end portion of an outer cylinder of the frame; turning the frame upside down, and placing the second magnetic circuit in the mounting groove of the first magnetic circuit; fixing the second voice coil to the second cone; inserting the second voice coil into the second magnetic gap of the second magnetic circuit, and fixing the outer edge of the second cone to the second end portion of the outer cylinder of the frame.

[0026] A third aspect of the present disclosure provides an automotive audio system, including a subwoofer, wherein the subwoofer includes the above loudspeaker.

[0027] The loudspeaker having dual cones of the present disclosure including two vibration systems, and the two magnetic circuits are nested within each other, achieving an enhanced effect of deep bass and functionality similar to that of a subwoofer, exhibiting excellent performance in the low-band-frequency range while not requiring an additionally configured box, and itself having a compact structure that reduces the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the present disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings may be obtained based on these drawings without the exercise of inventive effort. FIG. 1 is an exploded view of a loudspeaker according to an embodiment of the present disclosure. FIG. 2 is a top view of a loudspeaker according to an embodiment of the present disclosure. FIG. 3 is a cross-sectional view along the line A-A in FIG. 2. FIG. 4 is a schematic view of a half of the structure of a loudspeaker according to an embodiment of the present disclosure. FIG. 5 is an enlarged partial view of portion A in FIG. 4. FIG. 6 is an enlarged partial view of portion B in FIG. 4. FIG. 7 is a schematic view of a half of the frame of a loudspeaker according to an embodiment of the present disclosure. FIG. 8 is a schematic diagram of cone vibration of the loudspeaker according to Embodiment 1 of the present disclosure. FIG. 9 is a schematic diagram of cone vibration of the loudspeaker according to Embodiment 2 of the present disclosure. FIG. 10 shows performance test curves of three kinds of loudspeakers.

[0029] Reference signs, 1 - frame; 11 - outer cylinder; 110 - vent hole; 111 - first interface; 112 - second interface; 12 - inner cylinder; 13 - connecting rib; 2 - first cone; 21 - first cone body; 22 - first bracket; 221 - first flange; 3 - first voice coil; 31 - first airflow hole; 32 - first lead; 4 - first magnetic circuit; 40 - first magnetic gap; 41 - first magnetic bowl; 42 - first magnet; 43 - first front panel; 44 - mounting groove; 440 - through hole; 5 - first positioning spider; 6 - second cone; 61 - second cone body; 62 - second bracket; 621 - second flange; 7 - second voice coil; 71 - second airflow hole; 72 - second lead; 721 - second flange; 8 - second magnetic circuit; 80 - second magnetic gap; 81 - second magnetic bowl; 82 - second magnet; 83 - second front panel; 9 - second positioning spider; 10 - magnetic shielding material. DETAILED DESCRIPTION

[0030] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is intended to help understand the present disclosure, but is not intended to limit the present disclosure. In addition, the technical features involved in the respective embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0031] In the present disclosure, "inner" and "outer" are defined with reference to a centerline of the voice coil, with orientations closer to the centerline of the voice coil being inner and the opposite being outer. The orientation terms "upper," "lower," and "horizontal" are intended to facilitate the understanding of the structure of the loudspeaker system by those skilled in the art, and are not used to limit the state of the loudspeaker after it is installed in a use scenario. For example, the loudspeaker may be installed on a horizontal surface, an inclined surface, or a vertical surface on an automobile.

[0032] The present embodiment provides a loudspeaker having dual cones, which is capable of realizing the function of a subwoofer with a relatively small volume and has a sound effect of enhanced deep bass. FIG. 1 to FIG. 8 show an example of a loudspeaker having dual cones. Referring to FIG. 1 to FIG. 8, the loudspeaker comprises a frame 1 and two vibration systems mounted in the frame 1. The first vibration system comprises a first cone 2, a first voice coil 3, a first magnetic circuit 4, and a first positioning spider 5, and the second vibration system comprises a second cone 6, a second voice coil 7, a second magnetic circuit 8, and a second positioning spider 9. Both vibration systems can vibrate and emit sound after being fed with an electrical signal, and the second magnetic circuit 8 is disposed within the first magnetic circuit 4.

[0033] The frame 1 is hollow and has a first end portion and a second end portion that are opposite to each other, with the first vibration system disposed at the first end portion of the frame 1 and the second vibration system disposed at the second end portion of the frame 1. As shown in FIG. 6 and FIG. 7, the frame 1 comprises an outer cylinder 11 and an inner cylinder 12, and the inner cylinder 12 is connected to the inner wall of the outer cylinder 11 via a plurality of spaced-apart connecting ribs 13. The outer cylinder 11 as a whole is a hollow cylindrical shape, and the inner cylinder 12 has a tapered portion with a larger upper portion and a smaller lower portion, wherein the diameter of the upper end portion of the inner cylinder 12 is greater than the diameter of the lower end portion thereof. The plurality of connecting ribs 13 are arranged at equal intervals along the circumferential direction of the inner cylinder 12, and are connected radially between the outer cylinder 11 and the inner cylinder 12. There are gaps between the plurality of connecting ribs 13, the inner cylinder 12 is entirely located within the outer cylinder 11, the height of the inner cylinder 12 is less than the height of the outer cylinder 11, and the outer diameter of the inner cylinder 12 is less than the inner diameter of the outer cylinder 11. One or more vent holes 110 are provided on the outer cylinder 11 to communicate the space inside the frame 1 with the outside atmosphere.

[0034] As shown in FIG. 3 and FIG. 4, the outer edge of the first cone 2 is fixedly connected to the first end portion of the frame 1 and seals the first end portion of the frame 1. Specifically, the outer edge of the first cone 2 is fixedly connected to the top end of the outer cylinder 11 of the frame 1. The first cone 2 has a front face and a back face, with the front face facing the outside of the frame 1 and the back face facing the inside of the frame 1, specifically facing the top end of the inner cylinder 12. Further, the first cone 2 has a flat plate-shaped first cone body 21. The outer edge of the second cone 6 is fixedly connected to the second end portion of the frame 1 and seals the second end portion of the frame 1. Specifically, the outer edge of the second cone 6 is fixedly connected to the bottom end of the outer cylinder 11 of the frame 1. The second cone 6 has a front face and a back face, with the front face facing the outside of the frame 1 and the back face facing the inside of the frame 1, specifically facing the bottom end of the inner cylinder 12. Further, the second cone 6 has a flat plate-shaped second cone body 61. The back face of the first cone 2 and the back face of the second cone 6 are disposed opposite each other, the first cone body 21 and the second cone body 61 are parallel to each other, and the inner cylinder 12 is located between the first cone 2 and the second cone 6. The first cone body 21 and the second cone body 61 are both perpendicular to the movement axis of the first voice coil 3 and / or the second voice coil 7 (specifically, the up-down direction in FIG. 3) in an initial state.

[0035] The first voice coil 3 is connected to the first cone 2, and the first voice coil 3 has a pair of first leads 32 (including a positive pole and a negative pole) for receiving audio signals. Specifically, as shown in FIG. 5, the top end of the first voice coil 3 is fixedly connected to the middle portion of the first cone 2 via a first bracket 22, the first bracket 22 has a top portion attached to the back face of the first cone 2 and a first flange 221 extending downwardly from the top portion, and the top of the first voice coil 3 is sleeved outside the first flange 221 and fixedly connected thereto, specifically by being adhered to the outer side surface of the first flange 221 with glue. The second voice coil 7 is connected to the second cone 6, and the second voice coil 7 has a pair of second leads 72 (including a positive pole and a negative pole) for receiving audio signals. Specifically, as shown in FIG. 6, the bottom end of the second voice coil 7 is fixedly connected to the middle portion of the second cone 6 via a second bracket 62, the second bracket 62 has a bottom portion attached to the back face of the second cone 6 and a second flange 621 extending upwardly from the bottom portion, and the bottom of the second voice coil 7 is sleeved outside the second flange 621 and fixedly connected thereto, specifically by being adhered to the outer side surface of the second flange 621 with glue. The diameter of the first voice coil 3 is greater than the diameter of the second voice coil 7.

[0036] As shown in FIG. 3 and FIG. 4, the first magnetic circuit 4 is disposed between the first cone 2 and the second cone 6, and the first magnetic circuit 4 is connected to the frame 1, specifically disposed on the inner cylinder 12 of the frame 1. The first magnetic circuit 4 is used to drive the first voice coil 3 to reciprocate along a movement axis, and the bottom end of the first voice coil 3 is inserted into the first magnetic gap 40 of the first magnetic circuit 4 from above. The first magnetic circuit 4 comprises a first magnetic bowl 41, and a first magnet 42 and a first front panel 43 disposed in the first magnetic bowl 41. The first magnetic bowl 41 is fixedly placed on the inner cylinder 12 and has a cavity with an open top end, and the first magnets 42 (of which there may be multiple) and the first front panel 43 are stacked and fixed to each other and fixed to the bottom wall of the first magnetic bowl 41. The first magnetic gap 40 is formed between the inner side surface of the first magnetic bowl 41 and the outer side surfaces of the first magnet 42 and the first front panel 43.

[0037] The second magnetic circuit 8 is used to drive the second voice coil 7 to reciprocate along the above-mentioned movement axis, and the top portion of the second voice coil 7 is inserted into the second magnetic gap 80 of the second magnetic circuit 8 from below. The second magnetic circuit 8 comprises a second magnetic bowl 81, and a second magnet 82 and a second front panel 83 disposed in the second magnetic bowl 81. The second magnetic bowl 81 has a cavity with an open bottom end, and the second magnet 82 and the first front panel 43 are stacked and fixed to each other and fixed to the top wall of the first magnetic bowl 41. The second magnetic gap 80 is formed between the inner side surface of the second magnetic bowl 81 and the outer side surfaces of the second magnet 82 and the second front panel 83.

[0038] The second magnetic circuit 8 is nested in the first magnetic circuit 4. Specifically, a mounting groove 44 is provided in the first magnetic circuit 4, and the second magnetic circuit 8 is disposed in the mounting groove 44 of the first magnetic circuit 4. Further, as shown in FIG. 3, FIG. 4, and FIG. 6, a through hole 440 is provided at the bottom of the first magnetic bowl 41 and in at least one first magnet 42, and the through holes 440 are aligned to form all or a part of the mounting groove 44. Further, through holes 440 are provided at the bottom of the first magnetic bowl 41, in the first front panel 43, and in all of the first magnets 42, and the respective through holes 440 are aligned to form the above-mentioned mounting groove 44, and the second magnetic circuit 8 is disposed within the through hole 440 of the first magnetic bowl 41 and the through hole 440 of at least one first magnet 42. The diameter of the first voice coil 3 is greater than the diameter of the second voice coil 7, and the aperture of the through hole 440 must be greater than the diameter of the second voice coil 7 and smaller than the diameter of the first voice coil 3.

[0039] A magnetic shielding material 10 is provided between the first magnetic circuit 4 and the second magnetic circuit 8. Specifically, in the present embodiment, the magnetic shielding material 10 is provided between the second magnetic circuit 8 and the first front panel 43. The magnetic shielding material 10 is selected from one or more combinations of plastic (such as PC), rubber, iron, cobalt, nickel, and aluminum. The magnetic shielding material 10 is provided at least on the top of the second magnetic circuit 8 to prevent the magnetic fields of the first magnetic circuit 4 and the second magnetic circuit 8 from influencing each other.

[0040] The inner edge of the first positioning spider 5 is fixed on the first voice coil 3, and the outer edge thereof is fixed on the frame 1. Specifically, the outer edge of the first positioning spider 5 is fixedly connected to the top end of the inner cylinder 12. The inner edge of the second positioning spider 9 is fixed on the second voice coil 7, and the outer edge thereof is fixed on the frame 1. Specifically, the outer edge of the second positioning spider 9 is fixedly connected to the bottom end of the inner cylinder 12. The first positioning spider 5 and the second positioning spider 9 are corrugated and elastic. The first positioning spider 5 and the second positioning spider 9 prevent the first voice coil 3 and the second voice coil 7 from shaking in directions other than the expected direction, and limit the first voice coil 3 and the second voice coil 7 to vibrate up and down substantially along the above-mentioned movement axis.

[0041] The first end portion of the frame 1 is closed by the first cone 2, and the second end portion is closed by the second cone 6, so as to form a chamber inside the frame 1. The first voice coil 3, the first magnetic circuit 4, the second voice coil 7, and the second magnetic circuit 8 are all located in this chamber, and the chamber communicates with the outside air through the plurality of vent holes 110 on the side wall of the outer cylinder 11 of the frame 1. Further, a first airflow hole 31 is provided on the first voice coil 3 to communicate the spaces inside and outside of the first voice coil 3; a second airflow hole 71 is provided on the second voice coil 7 to communicate the spaces inside and outside of the second voice coil 7.

[0042] A first interface 111 and a second interface 112 are provided on the outer cylinder 11 of the frame 1, which may be configured in the form of female connectors. The pair of leads of the first voice coil 3 may be respectively connected to a pair of solder tabs of the first interface 111, and the pair of leads of the second voice coil 7 may be respectively connected to a pair of solder tabs of the second interface 112. During operation, an audio signal can be selectively fed to one or both of the first voice coil 3 and the second voice coil 7, and a corresponding operating mode can be selected according to needs to achieve different playback effects; when both voice coils are operating, the first voice coil 3 and the second voice coil 7 are connected in parallel with each other, and may also be connected in series with each other. In certain other embodiments, the following lead connection mode may also be adopted: the positive lead of the first voice coil 3 and the positive lead of the second voice coil 7 are electrically connected and then connected to the first interface 111, and the negative lead of the first voice coil 3 and the negative lead of the second voice coil 7 are electrically connected and then connected to the second interface 112, that is, the first voice coil 3 and the second voice coil 7 are connected in parallel with each other. As shown in FIG. 8, after an audio signal is fed in, the first cone 2 and the second cone 6 vibrate up and down along the same movement axis, respectively, and their vibration directions are as shown by the two arrows in FIG. 8, with the first cone 2 and the second cone 6 vibrating synchronously and in opposite directions.

[0043] The present embodiment further provides an assembly method for the above loudspeaker, comprising the following steps: mounting the first magnetic circuit 4 in the inner cylinder 12 of the frame 1; fixing the first voice coil 3 to the first cone 2; inserting the first voice coil 3 into the first magnetic gap 40 of the first magnetic circuit 4, and fixing the outer edge of the first cone 2 on the first end portion of the outer cylinder 11 of the frame 1; turning the frame 1 upside down, and placing the second magnetic circuit 8 in the mounting groove 44 of the first magnetic circuit 4; fixing the second voice coil 7 to the second cone 6; inserting the second voice coil 7 into the second magnetic gap 80 of the second magnetic circuit 8, and fixing the outer edge of the second cone 6 on the second end portion of the outer cylinder 11 of the frame 1.

[0044] The present embodiment further provides an automotive audio system comprising a subwoofer. The subwoofer employs the above-mentioned loudspeaker, and the loudspeaker is directly assembled inside the automobile, for example, the frame 1 of the loudspeaker may be locked to a sheet metal part of the automobile by screws, without requiring an additionally configured box body.

[0045] FIG. 9 shows an example of another loudspeaker according to the present embodiment, in which the lead connection mode of the first voice coil 3 and the second voice coil 7 is different. Specifically, the first voice coil 3 and the second voice coil 7 are connected in series with each other. That is, the positive lead of the first voice coil 3 and the negative lead of the second voice coil 7 are electrically connected, and the negative lead of the first voice coil 3 and the positive lead of the second voice coil 7 are respectively electrically connected to audio input lines to receive audio signals. Alternatively, the negative lead of the first voice coil 3 and the positive lead of the second voice coil 7 are electrically connected, and the positive lead of the first voice coil 3 and the negative lead of the second voice coil 7 are respectively electrically connected to audio input lines to receive audio signals. As shown in FIG. 9, after an audio signal is fed in, the first cone 2 and the second cone 6 vibrate up and down along the same movement axis, respectively, and their vibration directions are as shown by the two arrows in FIG. 9, with the first cone 2 and the second cone 6 vibrating synchronously and in the same direction.Performance test:

[0046] Performance tests were carried out on the dual-cone loudspeaker shown in FIG. 1 to FIG. 8, a conventional bass speaker, and a conventional subwoofer, and the performance curves are shown in FIG. 10. The volume of the dual-cone loudspeaker shown in FIG. 1 to FIG. 8 is 1.64×10 6< mm 3< , the volume of the conventional bass speaker is 1.58×10 6< mm 3< , and the volume of the subwoofer is 1.4×10 7< mm 3< .

[0047] As can be seen from the frequency response curves of FIG. 10, in the low-frequency range of 40 to 100 Hz, the SPL (sound pressure level) of the dual-cone loudspeaker shown in FIG. 1 to FIG. 8 is significantly better than that of the conventional bass speaker, and is on average 2 to 3 dB higher than the SPL (sound pressure level) of the conventional subwoofer. Moreover, compared with a conventional bass speaker, which can mostly only be assembled on an automobile door panel, and a subwoofer, which can mostly only be installed in the trunk, the dual-cone loudspeaker of the present embodiment has relatively few restrictions on its installation position and can be configured on the automobile relatively flexibly.

[0048] The dual-cone loudspeaker of the present embodiment employs two vibration systems, and the two magnetic circuits are nested within each other, providing an enhanced effect of deep bass and functionality similar to that of a subwoofer, exhibiting excellent performance in the low-frequency range while not requiring an additionally configured box, and itself having a compact structure that reduces the space occupied, and is suitable for installation on an automobile as a subwoofer of an automotive audio system, and has low requirements on the installation position and space, with a relatively flexible and convenient installation.

[0049] The features of the embodiments of the present disclosure are set forth in the following clauses: 1. A loudspeaker having dual cones, comprising: a frame being hollow and comprising a first end portion and a second end portion opposite to each other; a first cone with an outer edge connected to the first end portion, and the first cone having a front face and a back face; a first voice coil connected to the first cone; a first magnetic circuit for driving the first voice coil to reciprocate along a movement axis; a second cone with an outer edge connected to the second end portion, and the second cone having a front face and a back face; a second voice coil connected to the second cone; and a second magnetic circuit for driving the second voice coil to reciprocate along the movement axis; wherein the back face of the first cone and the back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit. 2. The loudspeaker according to clause 1, wherein the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; the first voice coil, the first magnetic circuit, the second voice coil and the second magnetic circuit are all positioned in the chamber; a vent hole for communicating the chamber with outside air is provided on a side wall of the frame. 3. The loudspeaker according to clause 1, wherein the first magnetic circuit comprises a first magnetic bowl, and a first magnet and a first front panel disposed in the first magnetic bowl, wherein through holes are provided at a bottom of the first magnetic bowl and in at least one of the first magnets, and the through holes are aligned to form all or a part of the mounting groove; a diameter of the first voice coil is greater than a diameter of the second voice coil, and a diameter of the through hole is greater than the diameter of the second voice coil and smaller than the diameter of the first voice coil. 4. The loudspeaker according to clause 3, wherein through holes are respectively provided at the bottom of the first magnetic bowl, in the first front panel, and in all first magnets, and the through holes are respectively aligned to form the mounting groove. 5. The loudspeaker according to clause 3 or 4, wherein the second magnetic circuit is disposed in the through hole of the first magnetic bowl and the through hole of at least one first magnet. 6. The loudspeaker according to clause 5, wherein a magnetic shielding material is provided between the second magnetic circuit and the first front panel. 7. The loudspeaker according to clause 1, wherein a magnetic shielding material is provided between the first magnetic circuit and the second magnetic circuit. 8. The loudspeaker according to clause 1, wherein a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil; a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil. 9. The loudspeaker according to clause 1, wherein the first voice coil is fixedly connected to the first cone via a first bracket, the first bracket has a top portion attached to the back face of the first cone and a first flange extending downwardly from the top portion, and a top of the first voice coil is sleeved on the first flange and fixedly connected thereto; the second voice coil is fixedly connected to the second cone via a second bracket, the second bracket has a bottom portion attached to the back face of the second cone and a second flange extending upwardly from the bottom portion, and a bottom of the second voice coil is sleeved on the second flange and fixedly connected thereto. 10. The loudspeaker according to clause 1, wherein the loudspeaker further comprises a first positioning spider, an inner edge of the first positioning spider is fixed on the first voice coil and an outer edge of the first positioning spider is fixed on the frame; the loudspeaker further comprises a second positioning spider, an inner edge of the second positioning spider is fixed on the second voice coil and an outer edge of the second positioning spider is fixed on the frame. 11. The loudspeaker according to clause 10, wherein the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, and one or more vent holes are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, the first magnetic circuit is fixedly disposed in the inner cylinder, and the outer edge of the first positioning spider and the outer edge of the second positioning spider are respectively connected to two end portions of the inner cylinder; a diameter of an upper end portion of the inner cylinder is greater than a diameter of a lower end portion thereof. 12. The loudspeaker according to clause 1, wherein a first interface and a second interface are provided on the frame; leads of the first voice coil are electrically connected to the first interface, and leads of the second voice coil are electrically connected to the second interface; or, a positive lead of the first voice coil and a positive lead of the second voice coil are electrically connected to the first interface, and a negative lead of the first voice coil and a negative lead of the second voice coil are electrically connected to the second interface; or, leads of the first voice coil and leads of the second voice coil are connected in series and then connected between the first interface and the second interface. 13. The loudspeaker according to clause 1, wherein the first cone comprises a flat plate-shaped first cone body, the second cone comprises a flat plate-shaped second cone body, the first cone body and the second cone body are parallel to each other, and are both perpendicular to the movement axis in an initial state. 14. An assembly method for the loudspeaker according to any one of clauses 1 to 13, comprising the following steps: mounting the first magnetic circuit in an inner cylinder of the frame; fixing the first voice coil to the first cone; inserting the first voice coil into the first magnetic gap of the first magnetic circuit, and fixing the outer edge of the first cone to the first end portion of an outer cylinder of the frame; turning the frame upside down, and placing the second magnetic circuit in the mounting groove of the first magnetic circuit; fixing the second voice coil to the second cone; inserting the second voice coil into the second magnetic gap of the second magnetic circuit, and fixing the outer edge of the second cone to the second end portion of the outer cylinder of the frame. 15. An automotive audio system, comprising a subwoofer, wherein the subwoofer comprises the loudspeaker according to any one of clauses 1 to 13.

[0050] As shown in the present specification and claims, the terms "comprise" and "include" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0051] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms "a," "said," and "the" used herein may also include plural forms. It should further be understood that in the present disclosure, "a plurality of" refers to two or more, and other quantifiers are similar thereto.

[0052] It should further be understood that the terms "first," "second," etc. are used to describe various pieces of information, but the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other, and do not indicate a particular order or degree of importance. In fact, expressions such as "first," "second," etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

[0053] In the present disclosure, unless otherwise explicitly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but in contact through an additional feature therebetween. Moreover, a first feature being "on," "above," and "over" a second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the horizontal level of the first feature is higher than that of the second feature. A first feature being "beneath," "below," and "under" a second feature includes the first feature being directly beneath and obliquely beneath the second feature, or merely indicates that the horizontal level of the first feature is lower than that of the second feature.

[0054] The above embodiments are only intended to illustrate the technical concept and features of the present disclosure, and are preferred embodiments whose purpose is to enable those familiar with this technology to understand the contents of the present disclosure and to implement them accordingly, and cannot thereby limit the protection scope of the present disclosure.

Examples

Embodiment Construction

[0030]Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is intended to help understand the present disclosure, but is not intended to limit the present disclosure. In addition, the technical features involved in the respective embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.

[0031]In the present disclosure, "inner" and "outer" are defined with reference to a centerline of the voice coil, with orientations closer to the centerline of the voice coil being inner and the opposite being outer. The orientation terms "upper," "lower," and "horizontal" are intended to facilitate the understanding of the structure of the loudspeaker system by those s...

Claims

1. A loudspeaker, comprising: a frame being hollow and comprising a first end portion and a second end portion opposite to each other; a first cone with an outer edge connected to the first end portion, and the first cone having a front face and a back face; a first voice coil connected to the first cone; a first magnetic circuit for driving the first voice coil to reciprocate along a movement axis, and a first magnetic gap for the first voice coil to be inserted into being formed inside the first magnetic circuit; a second cone with an outer edge connected to the second end portion, and the second cone comprising a front face and a back face; a second voice coil connected to the second cone; and a second magnetic circuit for driving the second voice coil to reciprocate along the movement axis, and a second magnetic gap for the second voice coil to be inserted into being formed inside the second magnetic circuit; wherein the back face of the first cone and the back face of the second cone are disposed directly facing each other, the first magnetic circuit is disposed between the first cone and the second cone, the first magnetic circuit is connected to the frame, a mounting groove is provided within the first magnetic circuit, and the second magnetic circuit is disposed in the mounting groove of the first magnetic circuit.

2. The loudspeaker according to claim 1, characterized in that, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; the first voice coil, the first magnetic circuit, the second voice coil and the second magnetic circuit are all positioned in the chamber.

3. The loudspeaker according to claim 1, characterized in that, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; a vent hole for communicating the chamber with outside air is provided on a side wall of the frame.

4. The loudspeaker according to any one of the preceding claims, characterized in that, the first magnetic circuit comprises a first magnetic bowl, and a first magnet and a first front panel disposed in the first magnetic bowl, wherein through holes are respectively provided at a bottom of the first magnetic bowl and in at least one first magnet, and the through holes are aligned to form all or a part of the mounting groove; a diameter of the first voice coil is greater than a diameter of the second voice coil, and an diameter of the through holes is greater than the diameter of the second voice coil and smaller than the diameter of the first voice coil.

5. The loudspeaker according to claim 4, characterized in that, through holes are respectively provided at the bottom of the first magnetic bowl, in the first front panel, and in all first magnets, and the through holes are respectively aligned to form the mounting groove.

6. The loudspeaker according to claim 4 or 5, characterized in that, the second magnetic circuit is disposed in the through hole of the first magnetic bowl and the through hole of at least one first magnet.

7. The loudspeaker according to claim 6, characterized in that, a magnetic shielding material is arranged between the second magnetic circuit and the first front panel.

8. The loudspeaker according to any one of claims 4 to 7, characterized in that, there are two first magnets, the first front panel is located between the two first magnets, there are two second magnets, and a second front panel is provided between the two second magnets.

9. The loudspeaker according to any one of the preceding claims, characterized in that, a magnetic shielding material is provided between the first magnetic circuit and the second magnetic circuit.

10. The loudspeaker according to any one of the preceding claims, <b>characterized in that, a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil; a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil.

11. The loudspeaker according to any one of the preceding claims, <b>characterized in that, the first voice coil is fixedly connected to the first cone via a first bracket, the first bracket comprising a top portion attached to the back face of the first cone and a first flange extending downwardly from the top portion, and a top of the first voice coil is sleeved on the first flange and fixedly connected thereto; the second voice coil is fixedly connected to the second cone via a second bracket, the second bracket comprising a bottom portion attached to the back face of the second cone and a second flange extending upwardly from the bottom portion, and a bottom of the second voice coil is sleeved on the second flange and fixedly connected thereto.

12. The loudspeaker according to any one of the preceding claims, characterized in that, the loudspeaker further comprises a first positioning spider, an inner edge of the first positioning spider is fixed on the first voice coil and an outer edge of the first positioning spider is fixed on the frame; the loudspeaker further comprises a second positioning spider, an inner edge of the second positioning spider is fixed on the second voice coil and an outer edge of the second positioning spider is fixed on the frame.

13. The loudspeaker according to claim 12, <b>characterized in that, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, and one or more vent holes are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, the first magnetic circuit is fixedly disposed in the inner cylinder, and the outer edge of the first positioning spider and the outer edge of the second positioning spider are respectively connected to two end portions of the inner cylinder; a diameter of an upper end portion of the inner cylinder is greater than a diameter of a lower end portion thereof.

14. The loudspeaker according to any one of claims 1 to 12, <b>characterized in that, the frame comprises an outer cylinder and an inner cylinder, the first cone and the second cone are respectively connected to two end portions of the outer cylinder, the first end portion is closed by the first cone, and the second end portion is closed by the second cone, such that a chamber is formed inside the frame; one or more vent holes communicating the chamber with outside air are provided on the outer cylinder; the inner cylinder is connected to an inner wall of the outer cylinder via a plurality of connecting ribs spaced apart, and the first magnetic circuit is fixedly disposed in the inner cylinder; a first airflow hole is provided on the first voice coil to communicate spaces inside and outside of the first voice coil, and a second airflow hole is provided on the second voice coil to communicate spaces inside and outside of the second voice coil.

15. The loudspeaker according to any one of the preceding claims, characterized in that, a first interface and a second interface are provided on the frame; leads of the first voice coil is electrically connected to the first interface, and leads of the second voice coil is electrically connected to the second interface.

16. The loudspeaker according to any one of the preceding claims, characterized in that, a first interface and a second interface are provided on the frame; a positive lead of the first voice coil and a positive lead of the second voice coil are electrically connected to the first interface, and a negative lead of the first voice coil and a negative lead of the second voice coil are electrically connected to the second interface.

17. The loudspeaker according to any one of the preceding claims, <b>characterized in that, a first interface and a second interface are provided on the frame; leads of the first voice coil and leads of the second voice coil are connected in series and then connected between the first interface and the second interface.

18. The loudspeaker according to any one of the preceding claims, characterized in that, the first cone comprises a flat plate-shaped first cone body, the second cone comprises a flat plate-shaped second cone body, the first cone body and the second cone body are parallel to each other, and are both perpendicular to the movement axis in an initial state.

19. An assembly method for the loudspeaker according to any one of claims 1 to 18, comprising the following steps: mounting the first magnetic circuit in an inner cylinder of the frame; fixing the first voice coil to the first cone; inserting the first voice coil into the first magnetic gap of the first magnetic circuit, and fixing the outer edge of the first cone to the first end portion of an outer cylinder of the frame; turning the frame upside down, and placing the second magnetic circuit in the mounting groove of the first magnetic circuit; fixing the second voice coil to the second cone; inserting the second voice coil into the second magnetic gap of the second magnetic circuit, and fixing the outer edge of the second cone to the second end portion of the outer cylinder of the frame.

20. An automotive audio system, comprising a subwoofer, characterized in that, the subwoofer comprises the loudspeaker according to any one of claims 1 to 18.

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