A type of rear-mounted dual dynamic driver earphone

Abstract

This utility model relates to the field of dual dynamic driver headphone technology, aiming to solve the problems of existing push-pull dual dynamic driver headphones where a single dynamic driver unit is the main source of sound, resulting in limited dynamic range and output efficiency, and parallel dual dynamic driver headphones where the multi-cavity design leads to increased size and weight, and discomfort when worn. The present invention provides a rear-mounted dual dynamic driver headphone, including a housing, within which a first dynamic driver unit and a second dynamic driver unit are installed, arranged back-to-back. The space formed between the diaphragm side of the first dynamic driver unit and the housing is the front cavity of the first dynamic driver unit, and the space formed between the diaphragm side of the second dynamic driver unit and the housing is the front cavity of the second dynamic driver unit. The space between the two dynamic driver units is a shared rear cavity. The front cavities of the first and second dynamic driver units are connected by an acoustic channel. A sound outlet is provided on the housing, and the front cavity of the second dynamic driver unit is connected to the sound outlet. This utility model has significant improvements in sound quality, wearing comfort, and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of dual dynamic driver headphone technology, and more specifically, to a rear-mounted dual dynamic driver headphone. Background Technology

[0002] With the rapid development of consumer electronics and the increasing demand for high-quality audio experiences, headphones, as important audio output devices, face higher technical requirements in terms of sound quality, soundstage performance, and wearing comfort. Traditional single dynamic driver headphones, due to their limited frequency response range, struggle to simultaneously satisfy the demands for deep bass and clear treble. Therefore, dual dynamic driver headphones have emerged, using two dynamic drivers to process audio signals in different frequency bands, thereby improving the overall sound quality and dynamic range.

[0003] Common dual-dynamic-driver headphones include push-pull and parallel designs. In a push-pull design, one dynamic driver primarily produces sound, while the other assists by pushing air to enhance low-frequency response. In a parallel design, two dynamic drivers vibrate in parallel, covering both high and low frequencies for coordinated output. These designs aim to optimize frequency response and sound quality balance, meeting users' demands for a high-fidelity audio experience.

[0004] However, existing dual-dynamic headphone designs (including push-pull and parallel designs) still have significant limitations in terms of sound quality, soundstage, and structural design.

[0005] Push-pull dual dynamic driver headphones employ a diaphragm operation mode of "one dynamic driver vibrating, one dynamic driver driving." One dynamic driver is primarily responsible for converting electrical signals into sound signals, while the other drives air through vibration to enhance low-frequency effects. However, limited by insufficient effective vibrating area, only one dynamic driver primarily produces sound, resulting in limited dynamic range and output efficiency. Furthermore, although the air driving of the auxiliary dynamic driver can theoretically improve low frequencies, in practice, due to the nonlinearity of diaphragm movement and uneven airflow within the cavity, significant low-frequency distortion occurs, especially noticeable at high volumes or with complex audio signals.

[0006] Parallel dual-dynamic driver headphones use two dynamic drivers that vibrate in parallel, covering the mid-high and low frequencies respectively, to expand the frequency response range and improve sound quality. However, this design requires an independent acoustic channel for each dynamic driver and up to four acoustic chambers (front and rear chambers), significantly increasing the size and weight of the headphones. For example, the complex cavity design of in-ear headphones leads to a larger shell size, which may compress the ear canal and reduce comfort when worn. The larger size and weight can also cause ear fatigue, decreased fit, and affect noise isolation and wearing stability, especially during prolonged use. Utility Model Content

[0007] The present invention aims to provide a rear-mounted dual dynamic driver earphone to solve the problems of existing push-pull dual dynamic driver earphones where a single dynamic driver unit is the main source of sound, resulting in limited dynamic range and output efficiency, and parallel dual dynamic driver earphones where the multi-cavity design increases size and weight, and can easily cause ear canal pressure, ear fatigue and reduced sound insulation when worn.

[0008] This utility model is achieved using the following technical solution:

[0009] This utility model provides a rear-mounted dual dynamic driver earphone, including a housing. A first dynamic driver unit and a second dynamic driver unit are installed inside the housing. The first dynamic driver unit and the second dynamic driver unit are arranged back to back. The space formed between the diaphragm side of the first dynamic driver unit and the housing is the front cavity of the first dynamic driver unit. The space formed between the diaphragm side of the second dynamic driver unit and the housing is the front cavity of the second dynamic driver unit. The space between the first dynamic driver unit and the second dynamic driver unit is a rear cavity shared by the first dynamic driver unit and the second dynamic driver unit.

[0010] The front cavity of the first moving coil unit and the front cavity of the second moving coil unit are connected through an acoustic channel;

[0011] The housing is provided with a sound outlet, and the front cavity of the second moving coil unit is connected to the sound outlet.

[0012] As a preferred technical solution:

[0013] The first dynamic driver unit is a bass driver unit, and the second dynamic driver unit is a mid-high frequency driver unit.

[0014] As a preferred technical solution:

[0015] The housing is provided with a first pressure relief port and a second pressure relief port. The first pressure relief port is connected to the front cavity of the first moving coil unit, and the second pressure relief port is connected to the rear cavity shared by the two moving coil units.

[0016] As a preferred technical solution:

[0017] The housing includes a second moving coil unit front cavity frame, a first moving coil unit front cavity frame, and a common rear cavity frame, wherein the common rear cavity frame is fixedly connected between the second moving coil unit front cavity frame and the first moving coil unit front cavity frame.

[0018] The sound outlet is provided at one end of the front cavity frame of the second moving coil unit, and the other end of the front cavity frame of the second moving coil unit is used to connect with the shared rear cavity frame.

[0019] As a preferred technical solution:

[0020] The second moving coil unit is installed in the front cavity frame of the second moving coil unit. The front cavity frame of the second moving coil unit is provided with a mounting step. The common rear cavity frame abuts the second moving coil unit against the mounting step. The space formed between the diaphragm side of the second moving coil unit and the front cavity frame of the second moving coil unit is the front cavity of the second moving coil unit.

[0021] The first moving coil unit is installed in the front cavity frame of the first moving coil unit. An assembly step is provided in the front cavity frame of the first moving coil unit. The common rear cavity frame abuts the first moving coil unit against the assembly step. The space formed between the diaphragm side of the first moving coil unit and the front cavity frame of the first moving coil unit is the front cavity of the first moving coil unit.

[0022] The shared rear cavity frame is hollow inside, and the internal space of the shared rear cavity frame is a rear cavity shared by the first moving coil unit and the second moving coil unit.

[0023] As a preferred technical solution:

[0024] A channel structure connects the front cavity frame of the second moving coil unit to the front cavity frame of the first moving coil unit, and the internal space of the channel structure is the acoustic channel.

[0025] As a preferred technical solution:

[0026] The channel structure includes a first channel segment and a second channel segment. One end of the first channel segment is connected to the front cavity frame of the first moving coil unit, and one end of the second channel segment is connected to the front cavity frame of the second moving coil unit. The other end of the first channel segment is connected to the other end of the second channel segment. The first channel segment and the second channel segment are combined to form a complete channel structure.

[0027] As a preferred technical solution:

[0028] The first pressure relief port is provided on the front cavity frame of the first moving coil unit;

[0029] The shared rear cavity frame is provided with a second pressure relief port.

[0030] As a preferred technical solution:

[0031] The housing also includes a decorative fastener and a decorative cover plate. One side of the decorative fastener is fixedly connected to one side of the front cavity frame of the first moving coil unit, and the decorative cover plate is fixedly connected to the other side of the decorative fastener.

[0032] As a preferred technical solution:

[0033] The decorative fastener and the decorative cover plate are provided with pressure relief ports, the position of which corresponds to the position of the first pressure relief port.

[0034] As a preferred technical solution:

[0035] The housing also includes an earphone female connector, which is fixedly connected to the common rear cavity frame.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0037] This invention addresses the limitations of existing dual dynamic driver headphones in terms of sound quality, sound field effect, and structural design, and achieves comprehensive technical improvements.

[0038] Compared to push-pull dual dynamic driver headphones, which suffer from insufficient dynamic range and output efficiency due to the single dynamic driver unit being the primary source of sound, as well as low-frequency distortion, this invention significantly improves dynamic range and output efficiency by optimizing the dual dynamic driver collaborative working mechanism. It effectively reduces distortion at high volumes or under complex audio signals, achieving balanced sound quality and high-fidelity output across the entire frequency range.

[0039] Meanwhile, compared to parallel dual-dynamic driver headphones, which suffer from increased size and weight due to multi-cavity design, as well as problems such as ear canal pressure, ear fatigue, and reduced sound isolation caused by wearing them, this utility model significantly reduces the size and weight of the headphones through a simplified acoustic cavity and a shared rear cavity design. This improves fit and wearing stability, making them comfortable and pressure-free for long-term wear, with better sound isolation, making them particularly suitable for in-ear headphone usage scenarios.

[0040] Furthermore, by reducing the number of independent cavities and acoustic channels, the assembly process has been simplified, manufacturing complexity and production costs have been reduced, and while maintaining high-performance acoustics, greater economic efficiency and feasibility have been provided for large-scale production.

[0041] In summary, this invention has achieved significant improvements in sound quality, wearing comfort, and production efficiency, effectively solving the core problems of existing technologies, providing users with a high-quality audio experience, and opening up new technological directions for headphone design and manufacturing. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the rear-mounted dual dynamic driver earphone described in Embodiment 1 of this utility model.

[0043] Figure 2 This is a schematic diagram of the sound output path of the first moving coil unit described in this utility model.

[0044] Figure 3 This is a schematic diagram of the sound output path of the second moving coil unit described in this utility model.

[0045] Figure 4 This is a schematic diagram of the pressure relief through the first pressure relief port described in this utility model.

[0046] Figure 5 This is a schematic diagram of the pressure relief through the second pressure relief port described in this utility model.

[0047] Figure 6 This is a schematic diagram of the structure of the rear-mounted dual dynamic driver earphone described in Embodiment 2 of this utility model.

[0048] Figure 7 for Figure 6 The right view.

[0049] Figure 8 for Figure 7 Cross-sectional view along the AA direction.

[0050] Figure 9 for Figure 7 Cross-sectional view along the BB direction.

[0051] Figure 10 This is a schematic diagram of the front cavity frame and the second channel segment of the second moving coil unit described in this utility model.

[0052] Figure 11 This is a schematic diagram of the structure of the second moving coil unit described in this utility model.

[0053] Figure 12 This is a schematic diagram of the shared rear cavity frame described in this utility model.

[0054] Figure 13 This is a schematic diagram of the structure of the first moving coil unit described in this utility model.

[0055] Figure 14 This is a schematic diagram of the front cavity frame and the first channel segment of the first moving coil unit described in this utility model.

[0056] Figure 15 This is a structural schematic diagram of the decorative fastener described in this utility model.

[0057] Figure 16 This is a schematic diagram of the structure of the decorative cover plate described in this utility model.

[0058] Figure 17 This is a schematic diagram of the headphone socket of the present invention.

[0059] Figure 18 This is a structural schematic diagram of the rear-mounted dual dynamic driver earphone described in Embodiment 2 of this utility model from another angle.

[0060] Icons: 1-House, 2-First dynamic driver unit, 3-Second dynamic driver unit, 4-Front cavity of the first dynamic driver unit, 5-Front cavity of the second dynamic driver unit, 6-Rear cavity, 7-Sound channel, 8-Sound outlet, 9-First pressure relief port, 10-Second pressure relief port, 11-Front cavity frame of the first dynamic driver unit, 12-Front cavity frame of the second dynamic driver unit, 13-Shared rear cavity frame, 14-First channel segment, 15-Second channel segment, 16-Decorative fastener, 17-Decorative cover plate, 18-Earphone socket, 19-Diaphragm. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0062] Example 1

[0063] like Figure 1 As shown, this embodiment proposes a rear-mounted dual dynamic driver earphone, including a housing 1. A first dynamic driver unit 2 and a second dynamic driver unit 3 are installed inside the housing 1. The first dynamic driver unit 2 and the second dynamic driver unit 3 are used for sound generation. The first dynamic driver unit 2 is responsible for audio output in a specific frequency range (usually low frequencies), and the second dynamic driver unit 3 is responsible for audio output in a specific frequency range (usually mid-high frequencies). That is, the first dynamic driver unit 2 is a bass unit, and the second dynamic driver unit 3 is a mid-high frequency unit.

[0064] The first moving coil unit 2 and the second moving coil unit 3 are arranged opposite to each other. The space formed between the diaphragm side of the first moving coil unit 2 and the housing 1 is the front cavity 4 of the first moving coil unit. The space formed between the diaphragm side of the second moving coil unit 3 and the housing 1 is the front cavity 5 of the second moving coil unit. The space between the first moving coil unit 2 and the second moving coil unit 3 is the rear cavity 6 shared by the first moving coil unit 2 and the second moving coil unit 3.

[0065] The front cavity is the acoustic cavity in front of the dynamic coil unit, and the rear cavity 6 is the acoustic cavity behind the dynamic coil unit.

[0066] The front cavity 4 of the first moving coil unit and the front cavity 5 of the second moving coil unit are connected by an acoustic channel 7, which is an acoustic channel specifically designed for the first moving coil unit 2.

[0067] The housing 1 is provided with a sound outlet 8, which is the channel for the headphone sound output. The front cavity 5 of the second dynamic driver unit is connected to the sound outlet 8.

[0068] The housing 1 is provided with a first pressure relief port 9 and a second pressure relief port 10. The first pressure relief port 9 is connected to the front cavity 4 of the first moving coil unit, and the second pressure relief port 10 is connected to the rear cavity 6 shared by the first moving coil unit 2 and the second moving coil unit 3. The first pressure relief port 9 is used to adjust the internal air pressure in the front cavity 4 of the first moving coil unit and the front cavity 5 of the second moving coil unit, and the second pressure relief port 10 is used to adjust the internal air pressure in the rear cavity 6 shared by the first moving coil unit 2 and the second moving coil unit 3.

[0069] This utility model adopts a back-mounted dual-dynamic coil design, so that the first dynamic coil unit 2 and the second dynamic coil unit 3 share a rear cavity 6 to optimize acoustic performance and structural compactness.

[0070] The complete sound path of the first moving coil unit 2 and the second moving coil unit 3 is described in detail below, including the sound output path of the first moving coil unit 2 and the second moving coil unit 3, and the functions of front cavity depressurization and rear cavity depressurization.

[0071] The sound output path of the first dynamic driver unit 2 is as follows:

[0072] like Figure 2 As shown, after receiving an electrical signal, the diaphragm of the first moving coil unit 2 converts the electrical signal into an acoustic signal. The acoustic signal enters the front cavity 4 of the first moving coil unit and is then transmitted to the front cavity 5 of the second moving coil unit through the acoustic channel 7. In the front cavity 5 of the second moving coil unit, the acoustic signal of the first moving coil unit 2 mixes with the acoustic signal of the second moving coil unit 3, and is finally output to the user's ear canal through the sound outlet 8.

[0073] The sound output path of the second dynamic driver unit 3 is as follows:

[0074] like Figure 3 As shown, after the second moving coil unit 3 receives the electrical signal, its diaphragm converts the electrical signal into an acoustic signal, which directly enters the front cavity 5 of the second moving coil unit. Subsequently, the acoustic signal from the second moving coil unit 3 mixes with the acoustic signal from the first moving coil unit 2 in the front cavity 5 of the second moving coil unit and is output through the sound outlet 8.

[0075] The function of the first pressure relief port 9 is:

[0076] like Figure 4As shown, the first pressure relief port 9 is connected to the front cavity 4 of the first moving coil unit, which can adjust the air pressure change in the front cavity 4 of the first moving coil unit. The air pressure fluctuation generated by the diaphragm movement of the first moving coil unit 2 is directly discharged through the first pressure relief port 9. The air pressure fluctuation generated by the diaphragm movement of the second moving coil unit 3 is transmitted to the front cavity 4 of the first moving coil unit through the sound channel 7, and is discharged through the first pressure relief port 9 to ensure that the diaphragm movement is not limited by air pressure.

[0077] The function of the second pressure relief port 10 is:

[0078] like Figure 5 As shown, the second pressure relief port 10 is connected to the rear cavity 6 shared by the two moving coil units, and is used to regulate the air pressure changes in the rear cavity 6 shared by the two moving coil units. The diaphragm movement of the first moving coil unit 2 and the second moving coil unit 3 causes air pressure fluctuations in the rear cavity 6. Excess air pressure is released through the second pressure relief port 10 to optimize the diaphragm response and low-frequency performance.

[0079] This invention's rear-mounted dual dynamic driver earphones, through a shared rear cavity and rear-mounted layout, enable the first dynamic driver unit 2 and the second dynamic driver unit 3 to achieve efficient collaboration within a more compact space. Compared to traditional push-pull or parallel dual dynamic driver earphones, this significantly reduces the earphone's size, improves wearing comfort, and enhances design flexibility. The acoustic channel 7 is designed as a low-pass filter structure, effectively filtering high-frequency components. Furthermore, this invention, through a shared rear cavity and simplified acoustic cavity design, reduces the number of independent cavities and channels, simplifying the assembly process and lowering manufacturing complexity and production costs.

[0080] Example 2

[0081] The difference between this embodiment and Embodiment 1 is that:

[0082] like Figures 6-18 As shown, the housing 1 includes a second moving coil unit front cavity frame 12, a first moving coil unit front cavity frame 11, and a common rear cavity frame 13, wherein the common rear cavity frame 13 is fixedly connected between the second moving coil unit front cavity frame 12 and the first moving coil unit front cavity frame 11.

[0083] One end of the front cavity frame 12 of the second moving coil unit is provided with the sound outlet 8, and the other end of the front cavity frame 12 of the second moving coil unit is used to connect with the shared rear cavity frame 13.

[0084] The second moving coil unit 3 is installed in the front cavity frame 12 of the second moving coil unit. The front cavity frame 12 of the second moving coil unit is provided with an installation step. The common rear cavity frame 13 abuts the second moving coil unit 3 against the installation step. The space formed between the diaphragm side of the second moving coil unit 3 and the front cavity frame 12 of the second moving coil unit is the front cavity 5 of the second moving coil unit. The front cavity 5 of the second moving coil unit is connected to the sound outlet 8.

[0085] The first moving coil unit 2 is installed in the front cavity frame 11 of the first moving coil unit. An assembly step is provided in the front cavity frame 11 of the first moving coil unit. The common rear cavity frame 13 abuts the first moving coil unit 2 against the assembly step. The space formed between the diaphragm side of the first moving coil unit 2 and the front cavity frame 11 of the first moving coil unit is the front cavity 4 of the first moving coil unit.

[0086] The first dynamic coil unit 2 and the second dynamic coil unit 3 are arranged back to back, adopting a back-mounted layout. The large-diameter diaphragm 19 of the first dynamic coil unit 2 faces outward, while the diaphragm 19 of the second dynamic coil unit 3 faces the ear canal.

[0087] The shared rear cavity frame 13 is hollow inside, and the internal space of the shared rear cavity frame 13 is the rear cavity 6 shared by the first moving coil unit 2 and the second moving coil unit 3.

[0088] In this embodiment, the shared rear cavity frame 13 is fixed together with the second moving coil unit front cavity frame 12 and the first moving coil unit front cavity frame 11 by adhesive bonding.

[0089] A channel structure is connected between the front cavity frame 12 of the second moving coil unit and the front cavity frame 11 of the first moving coil unit. The internal space of the channel structure is the acoustic channel 7, which connects the front cavity 5 of the second moving coil unit and the front cavity 4 of the first moving coil unit.

[0090] The channel structure includes a first channel segment 14 and a second channel segment 15. One end of the first channel segment 14 is connected to the front cavity frame 11 of the first moving coil unit, and one end of the second channel segment 15 is connected to the front cavity frame 12 of the second moving coil unit. The other end of the first channel segment 14 is connected to the other end of the second channel segment 15. The first channel segment 14 and the second channel segment 15 are combined to form a complete channel structure.

[0091] The first channel segment 14 and the second channel segment 15 may be connected by, but are not limited to, adhesive bonding.

[0092] The first channel segment 14 and the second channel segment 15 are connected by a combination process. At the same time, the front cavity frame 12 of the second moving coil unit and the front cavity frame 11 of the first moving coil unit are respectively connected and installed on both sides of the common rear cavity frame 13. The combination process simplifies the assembly process.

[0093] Since the first dynamic unit 2 is a bass unit and the second dynamic unit 3 is a mid-high frequency unit, the acoustic signal of the bass unit is transmitted to the front cavity of the mid-high frequency unit through the acoustic channel 7 formed by their combination.

[0094] The first pressure relief port 9 is provided on the front cavity frame 11 of the first moving coil unit, and the first pressure relief port 9 is connected to the front cavity 4 of the first moving coil unit; the first pressure relief port 9 is used to adjust the air pressure in the front cavities of the two moving coil units.

[0095] The shared rear cavity frame 13 is provided with a second pressure relief port 10, which is connected to the rear cavity 6 shared by the two moving coil units; the second pressure relief port 10 is used to adjust the air pressure in the rear cavity 6 of the two moving coil units.

[0096] The pressure relief port optimizes the air pressure balance between the front and rear chambers 6, reduces the motion resistance of the diaphragm 19, and ensures consistent acoustic performance.

[0097] This invention achieves a rear-mounted dual-dynamic coil design through precision assembly technology, providing the same sound quality optimization and structural compactness.

[0098] Example 3

[0099] The difference between this embodiment and Embodiment 2 is as follows:

[0100] like Figures 6-18 As shown, the housing 1 also includes a decorative fastener 16 and a decorative cover plate 17. One side of the decorative fastener 16 is fixedly connected to one side of the front cavity frame 11 of the first moving coil unit, and the decorative cover plate 17 is fixedly connected to the other side of the decorative fastener 16.

[0101] In this embodiment, the decorative fastener 16 is fixed to the front cavity frame 11 of the first moving coil unit by adhesive bonding, and the decorative cover plate 17 is fixed to the decorative fastener 16 by adhesive bonding.

[0102] The decorative fastener 16 and the decorative cover plate 17 are installed through an embedded design, which further enhances the structural compactness and aesthetics.

[0103] The decorative fastener 16 and the decorative cover plate 17 are provided with pressure relief ports, the position of which corresponds to the position of the first pressure relief port 9, ensuring that after the decorative fastener 16 and the decorative cover plate 17 are installed, the first pressure relief port 9 can still play the role of regulating the air pressure in the front cavity.

[0104] The housing 1 also includes an earphone female connector 18, which is fixedly connected to the common rear cavity frame 13.

[0105] In this embodiment, the earphone socket 18 is fixed to the common rear cavity frame 13 by screws.

[0106] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rear-mounted dual dynamic driver earphone, characterized in that: The device includes a housing, in which a first moving coil unit and a second moving coil unit are installed. The first moving coil unit and the second moving coil unit are arranged opposite to each other. The space formed between the diaphragm side of the first moving coil unit and the housing is the front cavity of the first moving coil unit. The space formed between the diaphragm side of the second moving coil unit and the housing is the front cavity of the second moving coil unit. The space between the first moving coil unit and the second moving coil unit is the rear cavity shared by the first moving coil unit and the second moving coil unit. The front cavity of the first moving coil unit and the front cavity of the second moving coil unit are connected through an acoustic channel; The housing is provided with a sound outlet, and the front cavity of the second moving coil unit is connected to the sound outlet.

2. The rear-mounted dual dynamic driver earphone according to claim 1, characterized in that: The housing is provided with a first pressure relief port and a second pressure relief port. The first pressure relief port is connected to the front cavity of the first moving coil unit, and the second pressure relief port is connected to the rear cavity shared by the two moving coil units.

3. The rear-mounted dual dynamic driver earphone according to claim 2, characterized in that: The housing includes a second moving coil unit front cavity frame, a first moving coil unit front cavity frame, and a common rear cavity frame, wherein the common rear cavity frame is fixedly connected between the second moving coil unit front cavity frame and the first moving coil unit front cavity frame. The sound outlet is provided at one end of the front cavity frame of the second moving coil unit, and the other end of the front cavity frame of the second moving coil unit is used to connect with the shared rear cavity frame.

4. The rear-mounted dual dynamic driver earphone according to claim 3, characterized in that: The second moving coil unit is installed in the front cavity frame of the second moving coil unit. The front cavity frame of the second moving coil unit is provided with a mounting step. The common rear cavity frame abuts the second moving coil unit against the mounting step. The space formed between the diaphragm side of the second moving coil unit and the front cavity frame of the second moving coil unit is the front cavity of the second moving coil unit. The first moving coil unit is installed in the front cavity frame of the first moving coil unit. An assembly step is provided in the front cavity frame of the first moving coil unit. The common rear cavity frame abuts the first moving coil unit against the assembly step. The space formed between the diaphragm side of the first moving coil unit and the front cavity frame of the first moving coil unit is the front cavity of the first moving coil unit. The shared rear cavity frame is hollow inside, and the internal space of the shared rear cavity frame is a rear cavity shared by the first moving coil unit and the second moving coil unit.

5. The rear-mounted dual dynamic driver earphone according to claim 3, characterized in that: A channel structure connects the front cavity frame of the second moving coil unit to the front cavity frame of the first moving coil unit, and the internal space of the channel structure is the acoustic channel.

6. The rear-mounted dual dynamic driver earphone according to claim 5, characterized in that: The channel structure includes a first channel segment and a second channel segment. One end of the first channel segment is connected to the front cavity frame of the first moving coil unit, and one end of the second channel segment is connected to the front cavity frame of the second moving coil unit. The other end of the first channel segment is connected to the other end of the second channel segment. The first channel segment and the second channel segment are combined to form a complete channel structure.

7. The rear-mounted dual dynamic driver earphone according to claim 3, characterized in that: The first pressure relief port is provided on the front cavity frame of the first moving coil unit; The shared rear cavity frame is provided with a second pressure relief port.

8. The rear-mounted dual dynamic driver earphone according to claim 7, characterized in that: The housing also includes a decorative fastener and a decorative cover plate. One side of the decorative fastener is fixedly connected to one side of the front cavity frame of the first moving coil unit, and the decorative cover plate is fixedly connected to the other side of the decorative fastener.

9. The rear-mounted dual dynamic driver earphone according to claim 8, characterized in that: The decorative fastener and the decorative cover plate are provided with pressure relief ports, the position of which corresponds to the position of the first pressure relief port.

10. The rear-mounted dual dynamic driver earphone according to any one of claims 3-9, characterized in that: The housing also includes an earphone female connector, which is fixedly connected to the common rear cavity frame.

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