Dual-diaphragm moving-coil loudspeaker

Abstract

The utility model discloses a double vibration diaphragm moving iron loudspeaker relates to earphone technical field, include: shell, support, two vibration diaphragms, driving arrangement. The support is connected in the shell, is provided with the sound hole on the support, two vibration diaphragms are all connected to the support, and the front cavity is formed between two vibration diaphragms and the support, and the sound hole is communicated with the front cavity, and the front cavity gradually expands in the direction close to the sound hole, and the driving arrangement is set up in the support, and the driving arrangement is used to drive two vibration diaphragms to vibrate. The utility model can improve the sound pressure and low frequency sound effect of open earphone.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, and in particular to a dual-diaphragm moving iron speaker. Background Technology

[0002] The core of a balanced armature speaker consists of a permanent magnet, a coil, and a miniature metal diaphragm. During operation, an electric current passes through the coil, generating a magnetic field that interacts with the permanent magnet, driving a connecting rod to vibrate the center point of the diaphragm to produce sound. Balanced armature speakers excel at reproducing high-frequency details due to their lightweight diaphragm and low inertia, making them suitable for precise audio applications. Closed-back headphones, with their sealed listening environment, can better transmit sound, hence balanced armature speakers are frequently used in them. Open-back headphones, with their open design, have higher requirements for sound pressure levels and low frequencies. However, existing balanced armature drivers use a single diaphragm, resulting in a small radiation area and low sound intensity. Furthermore, balanced armature speakers have poor low-frequency performance, making them unsuitable for open-back headphone applications. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a dual-diaphragm moving iron speaker, which can improve sound pressure level and low-frequency sound effects.

[0004] A dual-diaphragm moving-iron loudspeaker according to a first aspect of the present invention includes: a housing, a bracket, two diaphragms, and a driving device. The bracket is connected to the housing and has a sound outlet. Both diaphragms are connected to the bracket, forming a front cavity between the two diaphragms and the bracket. The sound outlet communicates with the front cavity, and the front cavity gradually expands in the direction close to the sound outlet. The driving device is disposed on the bracket and is used to drive the two diaphragms to vibrate.

[0005] A dual-diaphragm moving-iron speaker according to an embodiment of this utility model has at least the following beneficial effects: The driving device drives the two diaphragms to move simultaneously in a direction closer to each other, compressing the air in the front cavity and causing it to be discharged from the sound outlet. Simultaneously, the two diaphragms move simultaneously in a direction further apart from each other, increasing the volume of the front cavity and allowing air to be drawn in from the sound outlet. By setting the front cavity to gradually expand in the direction close to the sound outlet, a horn shape facing the sound outlet is formed. This prevents sound waves from reflecting back and forth in the front cavity, forming standing waves, thus improving sound quality and enhancing the speaker's sound pressure level and low-frequency performance.

[0006] According to some embodiments of the present invention, the two diaphragms are inclined toward the sound outlet, the bracket is connected to a reflective part, the reflective part is located in the front cavity, and the end of the reflective part near the sound outlet gradually narrows.

[0007] According to some embodiments of the present invention, the internal space of the outer shell is divided into the front cavity and the rear cavity by the vibrating diaphragm and the bracket, and the outer shell is provided with a plurality of exhaust holes, which are connected to the rear cavity.

[0008] According to some embodiments of the present invention, the bracket includes a cover plate and an extension frame. The cover plate is fixedly connected to the extension frame. The cover plate is used to close the opening at one end of the outer shell. The extension frame extends into the interior of the outer shell. The diaphragm and the reflector are both connected to the extension frame. The sound outlet is opened on the cover plate.

[0009] According to some embodiments of the present invention, the vibrating diaphragm includes a central portion and a folded ring portion, the folded ring portion is connected to the central portion around the central portion, the folded ring portion is connected to the extension frame, and the stiffness of the folded ring portion is less than the stiffness of the central portion.

[0010] According to some embodiments of this utility model, the driving device includes a magnet, a voice coil, and an iron core. The magnet is connected to the extension frame, the voice coil is connected to the side of the magnet away from the extension frame, the iron core passes through the voice coil, and magnetic rods are respectively connected to both ends of the iron core. The ends of the two magnetic rods away from the iron core are respectively connected to the two diaphragms. The magnet is located between the two magnetic rods. When the voice coil is energized, it can magnetize the two magnetic rods through the iron core.

[0011] According to some embodiments of the present invention, the iron core of the magnet is parallel to the direction of the magnetic poles of the magnet, and the two magnetic poles of the magnet are respectively close to the two magnetic rods.

[0012] According to some embodiments of the present invention, the magnetic rod and the iron core are connected by a bending portion, the magnetic rod, the bending portion and the iron core are integrally formed, and the thickness of the bending portion is less than the thickness of the magnetic rod.

[0013] According to some embodiments of this utility model, the voice coil is composed of conductive wires surrounding the outer side of the iron core, and the voice coil is connected to an external power source.

[0014] According to some embodiments of this utility model, the magnetic rod is connected to the center part by adhesive.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a cross-sectional schematic diagram of the installation structure according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0019] Figure 3 This is a schematic cross-sectional view of a bracket according to an embodiment of the present invention;

[0020] Figure 4 This is a top view of a bracket according to an embodiment of the present invention.

[0021] Icon labels:

[0022] Casing 100, vent 110;

[0023] 200 bracket, 201 sound outlet, 210 cover plate, 220 extension bracket;

[0024] Reflector 300;

[0025] Vibrating diaphragm 400, central part 410, folded ring part 420;

[0026] Anterior cavity 500, posterior cavity 510;

[0027] Drive unit 600, magnet 610, voice coil 620, iron core 630, magnetic rod 640, bending part 650; Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Reference Figures 1 to 4 As shown, an embodiment of the present invention provides a dual-diaphragm moving iron loudspeaker, comprising: a housing 100, a support 200, two diaphragms 400, and a driving device 600. The support 200 is connected inside the housing 100 and supports the internal components of the housing 100. The support 200 has a sound outlet 201, which is elongated. Both diaphragms 400 are connected to the support 200, and the two diaphragms 400 and the support 200 together form a front cavity 500. The sound outlet 201 communicates with the front cavity 500. When the diaphragms 400 vibrate, they cause a change in the volume of the front cavity 500, causing air in the front cavity 500 to continuously enter and exit through the sound outlet 201, thereby causing the air at the sound outlet 201 to vibrate and produce sound. The driving device 600 is disposed on the support 200 and is used to drive the two diaphragms 400 to vibrate. Compared to the single diaphragm in existing technologies, the vibration of two diaphragms 400 allows for a greater change in the volume of the front cavity 500, thereby increasing the air amplitude. This increased air amplitude enhances sound pressure level and bass response, making it suitable for open-back Bluetooth headphones with high sound intensity requirements. Predictably, the vibration phases of the two diaphragms 400 are opposite. When both diaphragms 400 move towards each other, they compress the air within the front cavity 500, causing it to exit through the sound outlet 201. Conversely, when they move away from each other, they increase the volume of the front cavity 500, drawing air in through the sound outlet 201. By setting the front cavity 500 to gradually expand towards the sound outlet 302, it forms a horn shape facing the sound outlet 201. This prevents sound waves from reflecting back and forth within the front cavity 500, thus preventing standing waves and improving sound quality. The reflector 300 gradually narrows at the end near the sound outlet 201, which guides the sound waves generated by the diaphragm 400 out of the sound outlet 201, further preventing the sound waves from reflecting back and forth in the front cavity 500 and forming standing waves, thus improving sound quality. The moving iron speaker provided in this embodiment can be adapted to open-back Bluetooth headphones, effectively improving the mid-to-high frequency sound quality of open-back Bluetooth headphones while ensuring low-frequency performance and sound pressure level.

[0033] Reference Figure 1 and Figure 2As shown, it can be understood that the two diaphragms 400 are inclined towards the sound outlet 201, and the included angle between the two diaphragms 400 is 14 degrees to 22 degrees. A reflector 300 is connected to the bracket 200, and the reflector 300 is located within the front cavity 500, gradually narrowing at the end near the sound outlet 201. The reflector 300 extends to the geometric center of the front cavity 500, so that the front cavity 500 forms a horn shape facing the sound outlet 201.

[0034] Reference Figure 1 and Figure 2 As shown, it can be understood that the two diaphragms 400 are symmetrically arranged with the reflector 300 as the center. The two diaphragms 400 vibrate synchronously, and the symmetrical arrangement of the diaphragms 400 can effectively improve the synergistic effect of the two diaphragms 400, thereby increasing the sound intensity and bass effect. The reflector 300 can also prevent the sound waves emitted by the two diaphragms 400 from interfering with each other within the front cavity 500.

[0035] Reference Figure 1 and Figure 2 As shown, it can be understood that the internal space of the housing 100 is divided into a front cavity 500 and a rear cavity 510 by the diaphragm 400 and the support 200. The housing 100 is provided with multiple exhaust holes 110, which communicate with the rear cavity 510. The number and size of the exhaust holes 110 should be as large as possible to reduce the resistance to air movement in the rear cavity 510, thereby reducing the resistance when the diaphragm 400 vibrates. It is foreseeable that the vibration in the rear cavity 510 is out of phase with the vibration in the front cavity 500, so the exhaust holes 110 cannot be located on the same side as the sound outlet 201 to prevent sound waves from canceling each other out.

[0036] Reference Figure 2 and Figure 3As shown, the bracket 200 includes a cover plate 210 and an extension frame 220. Since the outer shell 100 primarily serves a protective function, requires high strength, and has a simple shape, it is made of metal. Due to the complex structure of the extension frame 220 and the cover plate 210, they can be made of plastic injection molding. It is foreseeable that, to reduce interference with the drive device 600, the extension frame 220 and the cover plate 210 should be made of non-magnetic materials. The cover plate 210 and the extension frame 220 are integrally formed. The cover plate 210 is used to close the opening at one end of the outer shell 100. The size of the cover plate 210 is larger than the size of the opening, and the cover plate 210 is connected to the outer shell 100 by adhesive. The extension frame 220 extends into the interior of the outer shell 100. The diaphragm 400 and the reflector 300 are both connected to the extension frame 220, and the sound outlet 201 is located at the center of the cover plate 210. The extension frame 220 has a stepped surface, and the periphery of the vibrating diaphragm 400 is adhered to the stepped surface with adhesive. The reflector 300 is integrally formed with the extension frame 220. During installation, the vibrating diaphragm 400 and the drive device 600 are first installed onto the bracket 200, and then the entire assembly is installed into the housing 100 through the opening. The cover plate 210 closes the opening of the housing 100, and then the cover plate 210 and the housing 100 are connected with adhesive, effectively simplifying the installation steps and improving production efficiency.

[0037] Reference Figure 1 and Figure 2 As shown, the diaphragm 400 includes a central portion 410 and a folded ring portion 420. The folded ring portion 420 is connected to the central portion 410 and is connected to the extension frame 220. The stiffness of the folded ring portion 420 is less than that of the central portion 410. The folded ring portion 420 is made of an elastic material, which gives the diaphragm 400 elasticity, allowing it to quickly return to its original position after being driven by the drive device 600, maintaining the linearity of vibration. Because the amplitude of low-frequency sound waves is relatively large, the folded ring portion 420 needs to be provided at the edge of the central portion 410 to allow the diaphragm to move back and forth significantly, pushing more air to generate low-frequency sound waves. The folded ring portion 420 also ensures that the diaphragm 400 always moves axially during vibration, preventing lateral displacement. The function of the folded ring portion 420 being connected to the central portion 410 is to ensure that the diaphragm 400 is subjected to uniform force during severe vibration through symmetrical mechanical distribution, avoiding deformation or fatigue fracture caused by stress concentration.

[0038] Reference Figure 1 and Figure 2As shown, the drive unit 600 includes a magnet 610, a voice coil 620, and an iron core 630. The magnet 610 is made of a permanent magnet material, such as neodymium iron boron, to provide a magnetic field. The magnet 610 is connected to the extension frame 220 with adhesive and is located in the rear cavity 510 to avoid affecting the acoustic structure in the front cavity 500. The voice coil 620 is connected to the side of the magnet 610 away from the extension frame 220 with adhesive. The iron core 630 passes through the voice coil 620. The voice coil 620 and the iron core 630 form an electromagnet 610, which can generate a magnetic field when energized. Furthermore, it can generate a changing magnetic field that changes with the current. Magnetic guide rods 640 are connected to both ends of the iron core 630. To ensure that the iron core 630 can be demagnetized immediately when the voice coil 620 is de-energized, both the magnetic guide rods 640 and the iron core 630 are made of soft iron or silicon steel, which demagnetizes quickly. Two magnetic rods 640, with their ends furthest from the iron core 630, are connected to two diaphragms 400. A magnet 610 is positioned between the two magnetic rods 640. When the voice coil 620 is energized, it magnetizes the two magnetic rods 640 through the iron core 630. The magnetized rods 640, in turn, generate a magnetic force with the magnetic field produced by the magnet 610, causing them to vibrate. The magnetic rods 640 then drive the diaphragms 400 to vibrate. Compared to dynamic-coil speakers, balanced armature speakers can accurately capture musical details, especially excelling in the mid-to-high frequency ranges, such as female vocals and string instruments. Their fast transient response makes them suitable for fast-paced pop or rock music.

[0039] It is understood that in some other embodiments of this utility model, multiple voice coils 620 can be provided, and the voice coils 620 can also be provided on the magnetic rod 640. Providing multiple voice coils 620 can effectively improve the amplitude and vibration sensitivity of the magnetic rod 640. Providing voice coils 620 on the magnetic rod 640 can increase the motion inertia of the magnetic rod 640, thus further enhancing the bass performance of the diaphragm 400.

[0040] Reference Figure 1 and Figure 2 As shown, it can be understood that magnet 610 is a bar magnet. The iron core 630 of magnet 610 is parallel to the direction of its magnetic poles. After being magnetized by voice coil 620, the magnetic poles of iron core 630 are parallel to the direction of the magnetic poles of magnet 610. The two magnetic poles of magnet 610 are respectively close to two magnetic rods 640. The magnetic rods 640 are positioned as close to the magnetic poles of magnet 610 as possible without affecting the amplitude, so that the magnetic rods 640 are in a relatively strong magnetic field. In this way, only a small current needs to be provided to voice coil 620 to make the magnetic rods 640 vibrate, which can improve the amplitude and sensitivity of diaphragm 400.

[0041] It is understood that in some other embodiments of this utility model, the magnet 610 may be composed of multiple magnets 610. The arrangement of multiple magnets 610 effectively constructs an efficient magnetic circuit, concentrates magnetic field energy at the magnetic rod 640, and improves the sensitivity and sound pressure of the speaker.

[0042] Reference Figure 1 and Figure 2 As shown, it can be understood that the magnetic rod 640 and the iron core 630 are connected by a bend 650. The magnetic rod 640, the bend 650, and the iron core 630 are integrally formed, and all three are soft magnetic materials with fast demagnetization speed. The thickness of the bend 650 is less than the thickness of the magnetic rod 640. It is foreseeable that during manufacturing, the thickness of the bend 650 affects the vibration amplitude of the magnetic rod 640. The smaller the thickness of the bend 650, the easier it is for the magnetic rod 640 to vibrate. However, if the thickness of the bend 650 is too small, the strength of the bend 650 will be insufficient, causing the magnetic rod 640 to separate from the iron core 630.

[0043] Reference Figure 1 and Figure 2 As shown, the voice coil 620 is composed of conductive wires surrounding the outer side of the iron core 630. The voice coil 620 uses copper enameled wire wrapped around the outer side of the iron core 630. As the core carrier of electromagnetic drive, the copper winding, with its high conductivity and low heat loss characteristics, significantly reduces resistance consumption during operation. Simultaneously, its surface insulating coating ensures long-term operational stability. A high-efficiency electrical circuit is formed with the external power supply system through the low-resistance wires. The voice coil 620 is connected to an external power source. When the voice coil 620 is energized, the Oersted effect generates a magnetic field near the voice coil 620, magnetizing the iron core 630.

[0044] Reference Figure 1 and Figure 2 As shown, it can be understood that the magnetic rod 640 and the center part 410 are connected by adhesive. The center part 410 is made of a lightweight and highly rigid material. The magnetic rod 640 drives the center part 410 to move, so the center part 410 needs to be made of a highly rigid material such as metal, carbon fiber or composite hard layer to ensure the rapid and accurate transmission of the vibration energy of the magnetic rod 640, avoid energy loss, and reduce phase distortion caused by local deformation.

[0045] Working principle: When a current signal flows into the voice coil 620, a magnetic induction magnetic field is formed. Guided by the iron core 630, a temporary magnet is formed at both ends of the iron core 630 by the magnetic rods 640. The two magnetic rods 640 and the two ends of the magnet 610 generate attraction or repulsion. The magnetic rods 640 swing left and right with the bend 650 as the fulcrum and pull the diaphragm 400 to move, thereby causing the air between the two diaphragms 400 to change, so that the air is discharged from the sound outlet to produce sound. For example: when the left end of the voice coil 620 is the S pole and the right end is the N pole, and the magnet 610 is always the N pole on the left and the S pole on the right, the vertical part of the left magnetic rod 640, being the S pole, is attracted to the N pole on the left end of the magnet 610 and moves to the right. The vertical part of the right magnetic rod 640, being the N pole, is attracted to the S pole on the right end of the magnet 610 and moves to the left. This compresses the air between the two diaphragms 400 and expels it through the sound outlet. When the left end of the voice coil 620 is the N pole... When the right end is the S pole, the magnet 610 always has the left end as the N pole and the right end as the S pole. The vertical part of the left magnetic rod 640 is the N pole, which is repelled by the N pole at the left end of the magnet 610 and moves to the left. The vertical part of the right magnetic rod 640 is the S pole, which is repelled by the S pole at the right end of the magnet 610 and moves to the right. This increases the volume of the front cavity 500, makes the air between the two diaphragms 400 less dense, and allows the air outside the sound inlet to flow into the front cavity 500.

[0046] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A dual-diaphragm moving iron horn, characterized in that, include: Outer shell (100); A bracket (200) is connected inside the outer shell (100), and a sound outlet (201) is provided on the bracket (200). Two diaphragms (400) are connected to the support (200), and a front cavity (500) is formed between the two diaphragms (400) and the support (200). The sound outlet (201) communicates with the front cavity (500), and the front cavity (500) gradually expands in the direction close to the sound outlet (201). A drive device (600) is disposed on the bracket (200) for driving the two diaphragms (400) to vibrate.

2. The dual-diaphragm moving-iron horn according to claim 1, characterized in that: The two diaphragms (400) are inclined toward the sound outlet (201), and the bracket (200) is connected to a reflector (300). The reflector (300) is located in the front cavity (500), and the end of the reflector (300) near the sound outlet (201) gradually narrows.

3. The dual-diaphragm moving-iron horn according to claim 1, characterized in that: The internal space of the outer shell (100) is divided into the front cavity (500) and the rear cavity (510) by the vibrating diaphragm (400) and the bracket (200). The outer shell (100) is provided with a plurality of exhaust holes (110), which are connected to the rear cavity (510).

4. The dual-diaphragm moving-iron horn according to claim 2, characterized in that: The bracket (200) includes a cover plate (210) and an extension frame (220). The cover plate (210) is fixedly connected to the extension frame (220). The cover plate (210) is used to close the opening at one end of the outer shell (100). The extension frame (220) extends into the interior of the outer shell (100). The diaphragm (400) and the reflector (300) are both connected to the extension frame (220). The sound outlet (201) is opened on the cover plate (210).

5. The dual-diaphragm moving-iron horn according to claim 4, characterized in that: The vibrating diaphragm (400) includes a central portion (410) and a folded ring portion (420), the folded ring portion (420) being connected around the central portion (410) and connected to the extension frame (220), the stiffness of the folded ring portion (420) being less than the stiffness of the central portion (410).

6. The dual-diaphragm moving-iron horn according to claim 5, characterized in that: The driving device (600) includes a magnet (610), a voice coil (620), and an iron core (630). The magnet (610) is connected to the extension frame (220). The voice coil (620) is connected to the side of the magnet (610) away from the extension frame (220). The iron core (630) passes through the voice coil (620). Magnetic rods (640) are connected to both ends of the iron core (630). The ends of the two magnetic rods (640) away from the iron core (630) are connected to the two diaphragms (400) respectively. The magnet (610) is located between the two magnetic rods (640). When the voice coil (620) is energized, it can magnetize the two magnetic rods (640) through the iron core (630).

7. The dual-diaphragm moving-iron horn according to claim 6, characterized in that: The core portion (630) of the magnet (610) is parallel to the direction of the magnetic poles of the magnet (610), and the two magnetic poles of the magnet (610) are respectively close to the two magnetic rods (640).

8. The dual-diaphragm moving-iron horn according to claim 6, characterized in that: The magnetic rod (640) is connected to the iron core (630) through a bend (650). The magnetic rod (640), the bend (650) and the iron core (630) are integrally formed. The thickness of the bend (650) is less than the thickness of the magnetic rod (640).

9. The dual-diaphragm moving-iron horn according to claim 6, characterized in that: The voice coil (620) is composed of conductive wires surrounding the outside of the iron core (630), and the voice coil (620) is connected to an external power source.

10. The dual-diaphragm moving-iron horn according to claim 6, characterized in that: The magnetic rod (640) is connected to the center part (410) by glue.

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