Positive and negative air pushing dual-tone diaphragm automobile sound system

Abstract

The application discloses a positive and negative air pushing double-sound diaphragm automobile sound system, which comprises a permanent magnet, a magnetic ring coaxially arranged on the radial outer side of the permanent magnet, a magnetic conducting ring coaxially arranged on the radial outer side of the magnetic ring, a first gap between the permanent magnet and the magnetic ring, the first gap being open to the left end of the permanent magnet, a second gap between the magnetic ring and the magnetic conducting ring, the second gap being open to the right end of the permanent magnet, a left loudspeaker assembly and a right loudspeaker assembly respectively arranged on the left end and the right end of the magnetic conducting ring, a left voice coil in the left loudspeaker assembly extending into the first gap, a right voice coil in the right loudspeaker assembly extending into the second gap, and the permanent magnet comprising a left permanent magnet matched with the left voice coil, a right permanent magnet matched with the right voice coil and an intermediate isolation layer between the left voice coil and the right voice coil. The application can solve the problems of the existing automobile sound system, such as large volume, small air pushing amount of a single sound system and mutual interference of two independent loudspeakers.

Description

Technical Field

[0001] This invention relates to the field of automotive audio technology, specifically to a dual-diaphragm automotive audio system driven by both positive and negative air currents. Background Technology

[0002] Traditional car audio systems, to cover the front and rear sound fields, typically require separate speakers (e.g., 1-2 drivers each in the front and rear doors). Each speaker contains core components such as permanent magnets and magnetic circuit assemblies, resulting in a large overall installation space requirement. Traditional unidirectional speakers (e.g., forward or rearward) exhibit significant sound wave directionality, leading to sound pressure level differences of 8-15 dB between the front and rear seats, and between the left and right sides of the vehicle. Furthermore, the air displacement of existing single-diaphragm speakers is limited by the diaphragm area and amplitude. Low-frequency signals (e.g., below 60Hz) require large-volume air vibration for effective reproduction, but the limited air displacement of a single diaphragm results in insufficient low-frequency extension. If two independent speakers work together, their resonant frequencies (voice coil, spider, diaphragm) may differ, causing mutual interference and increasing total harmonic distortion (THD) to over 1%. Especially at high volumes, this distortion can mask musical details and affect sound purity. Summary of the Invention

[0003] This invention provides a dual-diaphragm car audio system with positive and negative air-driven operation, which can solve the problems of existing car audio systems being large in size, having a small air-driven volume per speaker, and being prone to mutual interference when the two independent speakers are working.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dual-diaphragm car audio system with positive and negative air-driven components, comprising a permanent magnet, a magnetic ring coaxially mounted on the radially outer side of the permanent magnet, and a magnetic guide ring coaxially disposed on the radially outer side of the magnetic ring. A first gap is provided between the permanent magnet and the magnetic ring, opening towards the axial left end of the permanent magnet; a second gap is provided between the magnetic ring and the magnetic guide ring, opening towards the axial right end of the permanent magnet; a left speaker assembly and a right speaker assembly are respectively mounted on the axial left and axial right ends of the magnetic guide ring; the left voice coil of the left speaker assembly extends into the first gap; and the right voice coil of the right speaker assembly extends into the second gap. The permanent magnet comprises a left segment of permanent magnet matching the left voice coil, a right segment of permanent magnet matching the right voice coil, and an intermediate insulating layer located between the left and right voice coils. The left permanent magnet has an N pole on its left end and an S pole on its right end, while the right permanent magnet has an S pole on its left end and an N pole on its right end. By sharing a single permanent magnet between the left and right speaker components, the design eliminates the need for additional permanent magnets and matching magnetic circuit components found in traditional dual-speaker solutions. The left and right speaker components emit sound to both sides, covering the front and rear or left and right directions inside the vehicle. When both diaphragms work simultaneously, the total air displacement area is several times that of a single diaphragm. Combined with the coordinated vibration of the dual voice coils, the air displacement is significantly increased. The left and right speaker components adopt a symmetrical structural design with opposite vibration directions, which can cancel out some harmful vibrations. The permanent magnet adopts a segmented structure, achieving reverse magnetic fields of N→S and S→N in a single integrated permanent magnet. Stable output of the reverse magnetic field is achieved on a single permanent magnet, eliminating the need for additional magnets while improving magnetic field efficiency.

[0005] Preferably, the right end face of the left permanent magnet and the left end face of the right permanent magnet are both provided with conical sides, so that the docking area of ​​the left permanent magnet and the right permanent magnet forms a V-shaped magnetic field transition zone. This structure can reduce the abrupt change of the magnetic field at the boundary, reduce the rate of change of magnetic field strength between the first gap and the second gap from 20% / mm in the traditional right-angle docking to 5% / mm, improve the stability of the voice coil under force, and improve the continuity of the magnetic field at the two boundaries through the conical transition design.

[0006] Preferably, the intermediate isolation layer is a polyimide film with a thickness of no more than 0.1 mm. The intermediate isolation layer can avoid magnetic field short circuit caused by direct contact between the two permanent magnets, and at the same time buffer magnetic field interference during magnetization, ensuring clear boundaries between the two magnetization directions. The thickness of the intermediate isolation layer is less than 0.1 mm, which can avoid affecting the continuity of the magnetic field.

[0007] Preferably, the left voice coil includes a tubular hollow frame and multiple multi-layer wire groups wound around the right end of the tubular hollow frame. The right voice coil includes a tubular frame, with a single-layer loosely wound wire coil at the left end of the tubular frame. The right end of the tubular frame has a solid part inside, and the weight of the right voice coil is greater than that of the left voice coil. The differentiated arrangement of the multi-layer wire groups and wire coils makes the inductance of the left voice coil smaller than that of the right voice coil. This, combined with the fact that the weight of the right voice coil is greater than that of the left voice coil, forms a dynamic match, further suppressing the mutual inductance fluctuations caused by vibration coupling.

[0008] Preferably, the weight ratio of the left voice coil to the right voice coil is 1:2, so that when the right voice coil moves in the opposite direction, its inertia can be used to offset part of the vibration, and it can also be matched with the inductance ratio between the left and right voice coils.

[0009] Preferably, the wire diameter of the wire coil on the right voice coil is larger than the wire diameter of the multi-layer wire group on the left voice coil, and the winding helix spacing of the wire coil gradually increases from the left end to the right end. This structural arrangement can adapt to the axial displacement difference during low-frequency vibration.

[0010] Preferably, the left speaker assembly further includes a left frame connected to the axial left end of the magnetic ring, and a left spider and a left diaphragm connected to the left voice coil are installed in the left frame. The right speaker assembly further includes a right frame connected to the axial right end of the magnetic ring, and a right spider and a right diaphragm connected to the right voice coil are installed in the right frame. The structure is simple, the installation is convenient, and the left and right diaphragms are oriented in opposite directions.

[0011] Preferably, foam pads are installed on the right side of both the left and right end faces of the speaker frame to improve the vibration damping effect during the installation of the entire speaker.

[0012] Preferably, dust covers are installed in the middle of both the left and right voice coils to prevent external impurities from entering the left and right voice coils.

[0013] Preferably, the left and right ends of the permanent magnet are respectively equipped with a left pole piece and a right pole piece, and the two ends of the magnetic ring abut against the magnetic guide ring and the right pole piece respectively. The left and right pole pieces are close to the two ends of the permanent magnet along the axis, which can concentrate the magnetic field lines emanating from the permanent magnet to the gap formed by the magnetic cup and the magnetic guide ring, and can also block the magnetic field coupling between the permanent magnet and external metal parts (such as speaker housings and vehicle metal frames).

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Adopting a brand-new design structure, the left and right speaker components share a single permanent magnet, eliminating the need for additional permanent magnets and matching magnetic circuit components in traditional dual-speaker solutions. The left and right speaker components emit sound to both sides, covering the front and rear or left and right directions inside the vehicle. When the dual diaphragms work simultaneously, the total air-moving area is twice that of a single diaphragm. Combined with the coordinated vibration of the dual voice coils, the air displacement is significantly increased. The left and right speaker components adopt a symmetrical structural design with opposite vibration directions, which can cancel out some harmful vibrations.

[0016] The permanent magnet adopts a segmented structure, realizing the N→S and S→N reverse magnetic fields in a single integrated permanent magnet. It achieves stable output of the reverse magnetic field on a single permanent magnet, eliminating the need for an additional magnet while improving magnetic field efficiency and overcoming the technical bias that a single permanent magnet cannot provide a reverse magnetic field.

[0017] The left and right voice coils are designed differently. Through the different arrangement of multi-layer conductor groups and conductor coils, the inductance of the left voice coil is smaller than that of the right voice coil. This, combined with the fact that the weight of the right voice coil is greater than that of the left voice coil, forms a dynamic match, further suppressing the mutual inductance fluctuations caused by vibration coupling. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a front sectional view of the present invention;

[0020] Figure 3 This is a structural diagram of the permanent magnet of the present invention;

[0021] Figure 4 This is a structural diagram of the left and right voice coils of the present invention.

[0022] Figure label:

[0023] 1. Magnetic ring; 11. Second gap; 12. First gap; 13. Right spring; 14. Left spring; 15. Dust cover; 16. Left frame; 17. Left diaphragm; 18. Foam pad; 2. Magnetic ring; 3. Left voice coil; 31. Tubular hollow frame; 32. Multilayer conductor assembly; 4. Right voice coil; 41. Conductor coil; 42. Tubular frame; 43. Solid part; 5. Left pole piece; 6. Right diaphragm; 7. Right frame; 8. Right pole piece; 9. Permanent magnet; 91. Right section permanent magnet; 92. Left section permanent magnet; 93. Conical side; 94. Intermediate insulating layer. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In existing technologies, traditional car audio systems typically require separate speakers (such as 1-2 drivers each for the front and rear doors) to cover the sound field of the front and rear rows. Each speaker contains core components such as permanent magnets and magnetic circuit components, resulting in a large total installation space (especially in the cabin of new energy vehicles, where space is further compressed by batteries and electronic control systems). Moreover, the multi-magnet structure increases the weight of the entire vehicle (the weight of a single permanent magnet is about 50-100g, and two drivers would add 100-200g). Now, the number of speakers in new energy vehicles generally exceeds 15, so the overall weight of the multi-magnet structure is relatively large, which will affect the range or fuel economy.

[0026] Traditional single-diaphragm loudspeakers are limited by the diaphragm area and amplitude (diaphragm diameter is typically ≤10cm in a car environment). Low-frequency signals (such as below 60Hz) require large-volume air vibration to be effectively reproduced, but the limited air displacement of a single diaphragm results in insufficient low-frequency extension (usually stopping at 80Hz) and a narrow dynamic range (≤80dB), making it difficult to reproduce low-frequency details such as drum beats and bass in music. If two independent loudspeakers work together, the resonant frequencies of their vibration systems (voice coil, spider, diaphragm) may differ, causing mutual interference and increasing total harmonic distortion (THD) to over 1%. Especially at high volumes, distortion can mask musical details and affect the purity of sound quality.

[0027] To solve the above problems, such as Figure 1-4As shown, this invention provides a dual-diaphragm car audio system driven by both positive and negative air currents, including a permanent magnet 9. A magnetic ring 2 is coaxially mounted on the radial outer side of the permanent magnet 9, and a magnetic guide ring 1 is coaxially disposed on the radial outer side of the magnetic ring 2. A first gap 12 is provided between the permanent magnet 9 and the magnetic ring 2, opening towards the axial left end of the permanent magnet 9. A second gap 11 is provided between the magnetic ring 2 and the magnetic guide ring 1, opening towards the axial right end of the permanent magnet 9. A left speaker assembly and a right speaker assembly are respectively mounted on the axial left and axial right ends of the magnetic guide ring 1. The left voice coil 3 of the left speaker assembly extends into the first gap 12, and the right voice coil 4 of the right speaker assembly extends into the second gap 11. The permanent magnet 9 includes a left segment permanent magnet 92 that matches the left voice coil 3, a right segment permanent magnet 91 that matches the right voice coil 4, and a section located between the left voice coil 3 and the right voice coil 4. The intermediate isolation layer 94, the left end face of the left permanent magnet 92 is the N pole and the right end face is the S pole, the left end face of the right permanent magnet 91 is the S pole and the right end face is the N pole. By sharing a permanent magnet with the left and right speaker components, the design eliminates the need for additional permanent magnets and matching magnetic circuit components in traditional dual speaker solutions. The left and right speaker components emit sound to both sides, covering the front and rear or left and right directions inside the vehicle. When the dual diaphragms work simultaneously, the total air pushing area is twice that of the single diaphragm. With the coordinated vibration of the dual voice coils, the air displacement is significantly increased. The left and right speaker components adopt a symmetrical structure design with opposite vibration directions, which can cancel out some harmful vibrations. The permanent magnet 9 adopts a segmented structure, realizing the N→S and S→N reverse magnetic fields in a single integrated permanent magnet. The stable output of the reverse magnetic field is achieved on a single permanent magnet, eliminating the need for additional magnets while improving magnetic field efficiency.

[0028] Specifically, the magnetic ring 1 can adopt a split structure, which, when combined, forms an "I" shaped cross-section. This facilitates the fixed connection of its two axial ends to the left and right speaker components, respectively. The magnetic ring 2 is located inside the magnetic ring 1. In order to facilitate the formation of the first gap 12 and the second gap 11, the left axial end of the magnetic ring 2 is provided with a radially outward first step, and the right axial end of the magnetic ring 2 is provided with a radially inward second step. Therefore, the first step is used to form the second gap 11, and the second step is used to form the first gap 12. This structure is more compact and reasonable, making the most of the radial space of the speaker.

[0029] In this embodiment, the left permanent magnet 92 is made of high-performance neodymium iron boron alloy, with an axial length L1=15mm and a diameter D=20mm. The right permanent magnet 91 is also made of N52 neodymium iron boron alloy, with an axial length L2=15mm and a diameter consistent with the left permanent magnet 92. After the two permanent magnets are coaxially connected, the total length L=30mm and the diameter remains at 20mm, which is suitable for the compact installation space of the vehicle speaker. The intermediate isolation layer 94 is a polyimide film with a thickness of no more than 0.1mm. The intermediate isolation layer 94 can avoid magnetic field short circuits caused by direct contact between the two permanent magnets, and at the same time buffer magnetic field interference during magnetization, ensuring clear boundaries between the two magnetization directions. The thickness of the intermediate isolation layer 94 is less than 0.1mm to avoid affecting the continuity of the magnetic field. The two permanent magnets and the intermediate isolation layer 94 are bonded with epoxy resin adhesive (model E-51), with a bonding strength ≥20MPa and the adhesive layer thickness controlled within 0.05mm.

[0030] In this embodiment, both the right end face of the left permanent magnet 92 and the left end face of the right permanent magnet 91 are provided with conical side portions 93, so that the docking area of ​​the left permanent magnet 92 and the right permanent magnet 91 forms a V-shaped magnetic field transition zone. This structure can reduce the abrupt change of the magnetic field at the boundary, and reduce the rate of change of magnetic field strength between the first gap and the second gap from 20% / mm in the traditional right-angle docking to 5% / mm, thereby improving the stability of the voice coil under stress. Through the conical transition design, the continuity of the magnetic field at the two boundaries is improved. Specifically, the taper of the conical side portion 93 is 3°, and the end of the conical side portion 93 is chamfered by 0.5mm×45° to avoid the magnetic field from concentrating at the corners and causing magnetic leakage.

[0031] In traditional single-magnet structures, when the two voice coils move in opposite directions, one of the voice coils is always in the inefficient region of the magnetic field. However, in the technical solution of this embodiment, the radial magnetic field strength B1 at the first gap 12 is 0.96T, and the radial magnetic field strength B2 at the second gap 11 is 1.44T, both of which are in the efficient force-bearing range. Furthermore, through the conical transition design, the continuity of the magnetic field at the two boundaries is improved, and the electromagnetic force fluctuation during the movement of the left and right voice coils is reduced from ±15% to ±5%, and the total harmonic distortion (THD) is reduced from 1% to 0.3%.

[0032] In this embodiment, as a specific structure of the left voice coil 3, such as Figure 4As shown, the left voice coil 3 includes a tubular hollow frame 31 and multiple multilayer wire groups 32 wound around the right end of the tubular hollow frame 31. The right voice coil 4 includes a tubular frame 42. A single layer of wire coil 41 is loosely wound at the left end of the tubular frame 42. A solid part 43 is provided inside the right end of the tubular frame 42. The weight of the right voice coil 4 is greater than that of the left voice coil 3. The different arrangement of the multilayer wire groups 32 and the wire coil 41 makes the inductance of the left voice coil 3 less than that of the right voice coil 4. This, combined with the fact that the weight of the right voice coil 4 is greater than that of the left voice coil 3, forms a dynamic match, further suppressing the mutual inductance fluctuations caused by vibration coupling.

[0033] Specifically, the multilayer conductor group 32 uses high-purity oxygen-free copper wire as the conductor. There are four groups of multilayer conductor groups 32 arranged axially side-by-side, each group having 30 turns, for a total of 120 turns. A 0.01mm thick polyimide film is used for insulation between the multilayer conductor groups 32. The winding tension is controlled at 5g±1g to ensure a tight fit of the coil, and its inductance L1 is stable at 0.5mH±0.02mH. Viewed from the top of the left voice coil 3, the winding direction is clockwise, which, in conjunction with the radially outward magnetic field of the first gap 12, generates an axially forward driving force when current is applied.

[0034] The conductor coil 41 is made of silver-plated oxygen-free copper wire. The diameter of the conductor coil 41 on the right voice coil 4 is larger than the diameter of the conductor of the multi-layer conductor group 32 on the left voice coil 3, specifically φ0.2mm, which can carry a larger current. The conductor coil 41 has a total of 50 turns, and the spiral spacing of the conductor coil 41 gradually increases from the left end to the right end. This structural setting can adapt to the axial displacement difference during low-frequency vibration. The winding tension is controlled at 15g±2g to ensure that the coil fits tightly with the tubular frame 42, while reserving vibration space. Its inductance L2 is stable at 1.0mH±0.05mH. Viewed from the top of the right voice coil 4, the winding direction is counterclockwise, which cooperates with the radially inward magnetic field of the second gap 11 to generate an axially backward driving force when current is applied.

[0035] Therefore, the weight ratio of the left voice coil 3 to the right voice coil 4 is 1:2. This allows the right voice coil 4 to utilize its inertia to offset some of the vibrations during its reverse movement, and also matches the inductance ratio between the left voice coil 3 and the right voice coil 4.

[0036] Specifically, the tubular hollow skeleton 31 is made of polyimide tubing. A 0.05mm thick graphene thermally conductive coating (thermal conductivity 500W / m・K) can be sprayed on the inner wall of the tubular hollow skeleton 31 to quickly conduct the heat of the left voice coil 3 during operation to the magnetic cup for heat dissipation. Three axial flow guide grooves can also be opened on the outer wall to form an airflow channel with the magnetic circuit ventilation holes, which improves the heat dissipation efficiency by 40%.

[0037] The tubular skeleton 42 and the solid part 43 are made of 6061-T6 aluminum alloy. A spiral groove with a depth of 0.1mm is made on the outer circular surface of the tubular skeleton 42 to match the winding direction of the wire coil 41. The wire is embedded in the groove to achieve mechanical positioning and prevent loosening.

[0038] When the two voice coils move in opposite directions, due to electromagnetic induction, the change in current in the left voice coil generates a mutual inductance electromotive force in the right voice coil. In conventional structures, this mutual inductance electromotive force leads to signal distortion (total harmonic distortion (THD) increases to 1.2%). However, with the above-mentioned technical solution in this embodiment, when the tubular frame 42 of the right voice coil 4 moves in opposite directions, it cuts the alternating magnetic field generated by the left voice coil 3, inducing eddy currents. The direction of the eddy currents is opposite to the direction of the current in the left voice coil. The magnetic field generated by the eddy currents is opposite to the direction of the mutual inductance magnetic field, forming a "reverse cancellation" effect, which reduces the mutual inductance coefficient from 0.3mH to 0.05mH.

[0039] Meanwhile, the inductance L1 of the left voice coil 3 is 0.5mH and the inductance L2 of the right voice coil 4 is 1.0mH, with an inductance ratio of 1:2. This forms a dynamic match with the mass ratio of the two voice coils of 1:2, further suppressing the mutual inductance fluctuations caused by vibration coupling.

[0040] In this embodiment, the left speaker assembly further includes a left frame 16 connected to the axial left end of the magnetic ring 1. The left frame 16 houses a left spider 14 and a left diaphragm 17 connected to the left voice coil 3. The right speaker assembly further includes a right frame 7 connected to the axial right end of the magnetic ring 1. The right frame 7 houses a right spider 13 and a right diaphragm 6 connected to the right voice coil 4. The structure is simple and easy to install. The left diaphragm 17 and the right diaphragm 6 face opposite directions. In addition, foam pads 18 are installed on the right side of the end face of the left frame 16 and the right frame 7, which can improve the vibration reduction effect during the installation of the entire speaker. Dust covers 15 are installed in the middle of the left diaphragm 17 and the right diaphragm 6 to prevent external impurities from entering the left voice coil 3 and the right voice coil 4.

[0041] In this embodiment, a left pole piece 5 and a right pole piece 8 are respectively installed at the left and right ends of the permanent magnet 9. The two ends of the magnetic ring 2 abut against the magnetic guide ring 1 and the right pole piece 8, respectively. The left pole piece 5 and the right pole piece 8 are in close contact with the axial ends of the permanent magnet 9, which can concentrate the diverging magnetic field lines of the permanent magnet to the gap formed by the magnetic cup and the magnetic guide ring, and can also block the magnetic field coupling between the permanent magnet and external metal components (such as speaker housings and vehicle metal frames). Specifically, when the pole pieces are not installed, the magnetic field lines at both ends of the permanent magnet will diffuse randomly into space (leakage rate of about 30%). After the pole pieces are installed, the magnetic field lines are constrained inside the magnetic circuit by the magnetic guiding effect of the pole pieces, which increases the magnetic field strength of the first and second gaps, for example, from 0.8T to 1.0T, thereby enhancing the electromagnetic force on the voice coil and improving the sensitivity of the speaker.

[0042] Furthermore, the magnetic field distribution of the permanent magnet 9 itself may exhibit axial non-uniformity. The pole pieces, through their own magnetoresistance characteristics, can form a smooth magnetic field gradient. For example, the left pole piece 5 can reduce the radial component distribution deviation of the magnetic field in the first gap 12 from ±5% to ±2%, and the right pole piece 8 can simultaneously optimize the magnetic field uniformity of the second gap 11. Improved magnetic field uniformity can reduce the force fluctuations during voice coil vibration and lower nonlinear distortion.

[0043] As a specific embodiment 1 of the dual-diaphragm car audio system in this example:

[0044] Fitting the inner side of the front door interior panel of a certain pure electric SUV, with a reserved installation space of 120mm×80mm×60mm. The left speaker assembly faces the inside of the driver's cabin, towards the driver's ear, while the right speaker assembly faces the outside of the door, i.e., towards the door panel cavity. The left and right speaker frames 16 are connected to the metal frame of the interior panel via M4 screws. The compression of the foam gasket 18 on the end face of the speaker frame is controlled at 0.5mm to achieve vibration damping and sealing, preventing vibration from being transmitted to the vehicle body and causing abnormal noise. Based on the front door cavity volume (approximately 5L), the left diaphragm 17 is made of a 100mm diameter composite pulp membrane (rigidity modulus 2.5GPa), and the right diaphragm 6 is made of a 100mm diameter butyl rubber composite membrane (damping coefficient 0.3), adapted to the low-frequency resonance characteristics of the door.

[0045] The left voice coil 3 receives high-frequency signals from 2kHz to 20kHz. Through the dense winding design of the multi-layer wire group 32, the high-frequency directivity is controlled within ±30°, and the high-frequency sound pressure level at the driver's ear reaches 85dB. The right voice coil 4 receives mid-frequency signals from 20Hz to 2kHz. The eddy current effect of the tubular skeleton 42 reduces the mutual inductance distortion in the 500Hz frequency band from 0.8% to 0.2%.

[0046] When the dual diaphragms work together, the air displacement reaches 0.8L / s, the 60Hz low-frequency sound pressure level is increased by 6dB, the door cavity resonance is effectively utilized, and the bass extends down to 45Hz. The overall installation volume is 85cm³, while the traditional dual-speaker solution is 150cm³ and weighs 120g, compared to 220g for the traditional solution. Therefore, the load on the door suspension is reduced, and the hinge life is extended.

[0047] As a specific embodiment 2 of the dual-diaphragm car audio system in this example:

[0048] Installation Location: The dual-diaphragm car audio system is embedded below the central storage compartment of the center console. The left speaker faces the driver's seat, and the right speaker faces the passenger seat, achieving symmetrical sound field coverage for the front row. To address the metallic environment of the center console, the left electrode 5 and right electrode 8 utilize a 3mm thick silicon steel sheet laminated structure, improving magnetic shielding efficiency by 20dB and preventing interference with the vehicle navigation signal.

[0049] The 1:2 weight ratio of the left and right voice coils reduces the total harmonic distortion (THD) at 1kHz to 0.3%. The V-shaped magnetic field transition band ensures that the change rate of the magnetic field strength of the left and right voice coils is ≤5% / mm. The phase difference of the 2kHz signal is controlled within ±5°, and the stereo image positioning error in the center position of the front row is ≤5cm.

[0050] As a specific embodiment of the dual-diaphragm car audio system in this example:

[0051] Installation Location: The dual-diaphragm car audio system is integrated into both sides of the rear roof armrest. The left speaker unit points forward towards the second-row passengers, while the right speaker unit points backward towards the third-row passengers, covering the entire rear area of ​​a 7-seater vehicle. The right voice coil's wire diameter has been increased to 0.25mm, raising its current carrying capacity to 2A to meet the high volume demands of the rear seats. The solid 43 aluminum frame thickness has been increased to 2mm, enhancing eddy current compensation capabilities.

[0052] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0053] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A dual-diaphragm car audio system with positive and negative air-driven operation, comprising a permanent magnet (9), wherein a magnetic ring (2) is coaxially mounted on the radial outer side of the permanent magnet (9), and a magnetic guide ring (1) is coaxially disposed on the radial outer side of the magnetic ring (2), characterized in that, The first gap (12) is arranged between the permanent magnet (9) and the magnetic ring (2) and opens to the left end of the permanent magnet (9) in the axial direction, the second gap (11) is arranged between the magnetic ring (2) and the magnetic conducting ring (1) and opens to the right end of the permanent magnet (9) in the axial direction, the left loudspeaker assembly and the right loudspeaker assembly are respectively arranged at the left end and the right end of the magnetic conducting ring (1) in the axial direction, the left voice coil (3) in the left loudspeaker assembly extends into the first gap (12), the right voice coil (4) in the right loudspeaker assembly extends into the second gap (11), the permanent magnet (9) comprises the left permanent magnet (92) matched with the left voice coil (3), the right permanent magnet (91) matched with the right voice coil (4) and the middle isolation layer (94) between the left voice coil (3) and the right voice coil (4), the left end surface of the left permanent magnet (92) is N-pole and the right end surface is S-pole, the left end surface of the right permanent magnet (91) is S-pole and the right end surface is N-pole; The left voice coil (3) comprises the tubular hollow framework (31) and the multiple multi-layer wire groups (32) wound on the right end of the tubular hollow framework (31), the right voice coil (4) comprises the tubular framework (42), the wire coil (41) is arranged on the left end of the tubular framework (42) in a single layer and sparse winding, the solid part (43) is arranged inside the right end of the tubular framework (42), the weight of the right voice coil (4) is greater than that of the left voice coil (3), the different arrangement of the multiple multi-layer wire groups (32) and the wire coil (41) makes the inductance of the left voice coil (3) less than that of the right voice coil (4), and the dynamic matching is formed by the characteristics that the weight of the right voice coil (4) is greater than that of the left voice coil (3), and the mutual inductance fluctuation generated by the vibration coupling is further inhibited. The wire diameter of the wire coil (41) on the right voice coil (4) is greater than that of the multiple multi-layer wire groups (32) on the left voice coil (3), and the winding spiral pitch of the wire coil (41) gradually increases from the left end to the right end.

2. The positive and negative air push dual-tone membrane car audio according to claim 1, characterized in that: The right end surface of the left permanent magnet (92) and the left end surface of the right permanent magnet (91) are both provided with the tapered side (93), so that the abutting area of the left permanent magnet (92) and the right permanent magnet (91) forms a V-shaped magnetic field transition zone.

3. The positive and negative air thrust dual tone diaphragm car audio of claim 1, wherein: The middle isolation layer (94) is a polyimide film with a thickness not greater than 0.1 mm.

4. The positive and negative air thrust dual tone film car audio of claim 1, wherein: The weight ratio of the left voice coil (3) to the right voice coil (4) is 1:

2.

5. The positive and negative air thrust dual tone film car audio of claim 1, wherein: The left loudspeaker assembly further comprises the left baffle (16) connected with the left end of the magnetic conducting ring (1) in the axial direction, the left baffle (16) is internally provided with the left damper (14) connected with the left voice coil (3) and the left diaphragm (17), the right loudspeaker assembly further comprises the right baffle (7) connected with the right end of the magnetic conducting ring (1) in the axial direction, and the right baffle (7) is internally provided with the right damper (13) connected with the right voice coil (4) and the right diaphragm (6).

6. The positive and negative air thrust dual tone film car audio speaker of claim 5, wherein: The end surface right side of the left baffle (16) and the end surface right side of the right baffle (7) are both provided with the foam pad (18).

7. The positive and negative air thrust dual tone film car audio speaker of claim 5, wherein: The middle part of the left diaphragm (17) and the right diaphragm (6) are both provided with the dust cover (15).

8. The positive and negative air motion dual cone loudspeaker of claims 1-7, wherein: The left and right ends of the permanent magnet (9) are respectively provided with a left pole piece (5) and a right pole piece (8), and the two ends of the magnetic ring (2) respectively abut against the magnetic conducting ring (1) and the right pole piece (8).

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