Horn magnetic circuit structure

Abstract

A loudspeaker magnetic circuit structure disclosed by the present invention comprises a shell and a magnetic circuit assembly installed on the shell, the magnetic circuit assembly comprises a magnetic core, a coil, a magnet and an elastic sheet, the coil sleeves the magnetic core, the magnet is located on one side of the magnetic core and keeps a gap with the magnetic core, the magnet is connected to the shell through the elastic sheet, and the elastic sheet is arranged on the shell. One end of the magnet is used for being connected with a vibrating diaphragm of the loudspeaker; the voice coil of the loudspeaker is not bonded with the diaphragm, the wire diameter of the voice coil can be increased, the voice coil is not influenced by a magnetic gap, the power of the loudspeaker is indirectly improved, the voice coil is not easy to break, the quality is improved, the combination is simple, the yield is improved, the cost is reduced, the magnet consumption can be reduced, and the cost is further reduced.

Description

Technical Field

[0001] This invention relates to the field of sound-generating devices, and in particular to a speaker magnetic circuit structure. Background Technology

[0002] A loudspeaker is a transducer that converts electrical signals into sound signals. Common sound conduction methods include air conduction and bone conduction. Air conduction generates sound through diaphragm vibration, which is then transmitted to the user's ear via the air. Bone conduction utilizes the skull, bony labyrinth, inner ear fluid, cochlea, and auditory center to transmit sound waves. Existing air conduction loudspeakers typically include a bracket, a U-cup mounted on the bracket, and a diaphragm. Magnets and a washer are installed in the U-cup, forming a magnetic gap. A voice coil is mounted on the diaphragm, extending into the magnetic gap. A circuit board is electrically connected to the voice coil via wires, causing the voice coil to vibrate the diaphragm and produce sound. However, because the voice coil must be bonded to the diaphragm and its leads must be precisely fixed, assembly is difficult, resulting in low yield and high cost. The large number of magnets used also increases cost, and the voice coil is prone to wire breakage, compromising quality. Bonding the voice coil to the diaphragm prevents increasing the voice coil wire diameter and is also affected by the magnetic gap, making it difficult to increase speaker power.

[0003] Therefore, a new technology needs to be developed to solve the above problems. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a speaker magnetic circuit structure that enables the speaker's voice coil to be separated from the diaphragm, allowing for an increase in the voice coil wire diameter, and is unaffected by the magnetic gap, thereby indirectly increasing the speaker's power. Furthermore, the voice coil is less prone to wire breakage, improving quality. The assembly is simple, improving yield and reducing costs, and the amount of magnets used can be reduced, further lowering costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A speaker magnetic circuit structure includes a housing and a magnetic circuit assembly mounted on the housing. The magnetic circuit assembly includes a magnetic core, a coil, a magnet, and a spring. The coil is sleeved on the magnetic core. The magnet is located on one side of the magnetic core and maintains a gap with the magnetic core. The magnet is connected to the housing through the spring. One end of the magnet is used to connect to the diaphragm of the speaker.

[0006] As a preferred embodiment, the magnetic core extends laterally within the housing, and one end of the magnetic core is fixedly connected to the housing; the magnet extends vertically and is suspended within the housing.

[0007] As a preferred embodiment, one end of the magnet is connected to a pull rod, which is used to connect to the diaphragm of the horn.

[0008] As a preferred embodiment, the housing has a mounting cavity, the magnetic circuit assembly is mounted in the mounting cavity, a vibrating diaphragm is disposed in the mounting cavity, the vibrating diaphragm is arranged at a distance from the magnetic circuit assembly, and one end of the magnet is connected to the vibrating diaphragm.

[0009] As a preferred embodiment, the housing has a receiving cavity communicating with the mounting cavity, the magnetic circuit assembly is installed in the receiving cavity, a first positioning groove and a second positioning groove are respectively provided on opposite sides of the inner peripheral sidewall of the receiving cavity, one end of the magnetic core is positioned in the first positioning groove, the other end of the magnetic core extends laterally into the receiving cavity, the coil is sleeved on the other end of the magnetic core, one end of the spring is positioned in the second positioning groove, the other end of the spring extends laterally into the receiving cavity, and the magnet is connected to the other end of the spring.

[0010] As a preferred embodiment, the magnetic core includes a vertical portion, an upper horizontal portion, and a lower horizontal portion. The upper horizontal portion and the lower horizontal portion are respectively connected to the upper and lower ends of the vertical portion. The vertical portion is positioned in a first positioning groove. The upper horizontal portion and the lower horizontal portion extend laterally into the receiving cavity. The coil is sleeved on the upper horizontal portion, and the lower horizontal portion abuts against the inner bottom wall of the receiving cavity.

[0011] As a preferred embodiment, the spring includes a first vertical plate portion, a second vertical plate portion, and a horizontal plate portion. The first vertical plate portion and the second vertical plate portion are respectively connected to both ends of the horizontal plate portion. The first vertical plate portion is positioned in a second positioning groove. The horizontal plate portion extends laterally into the receiving cavity. The magnet is connected to the second vertical plate portion.

[0012] As a preferred embodiment, the bottom of the housing is provided with a through hole communicating with the receiving cavity, and the magnet is arranged opposite the through hole.

[0013] As a preferred embodiment, the opening of the mounting cavity is covered with a protective cover, which covers the vibrating diaphragm, and a front acoustic cavity is formed between the protective cover and the vibrating diaphragm. The protective cover is provided with multiple sound outlet holes.

[0014] As a preferred embodiment, the magnetic core is a silicon steel sheet.

[0015] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution: I. This invention combines a coil with a magnetic core and connects the magnet to the diaphragm of the speaker, while separating the coil from the diaphragm. This allows the voice coil of the speaker to be free from adhesion to the diaphragm, increasing the wire diameter of the voice coil (i.e., the coil) and making it unaffected by magnetic gaps, thus indirectly increasing the speaker power. Furthermore, the voice coil is less prone to breakage, improving quality. The simple assembly increases yield and reduces costs, and the amount of magnets used can be reduced, further lowering costs. Second, by connecting the magnet to the housing through a spring sheet and connecting one end of the magnet to the diaphragm, the present invention realizes the direct driving of the diaphragm by the magnet, reduces energy transfer loss, and improves vibration response speed and acoustic efficiency; moreover, the elastic connection of the spring sheet gives the magnet better self-balancing ability during vibration, reduces vibration distortion caused by magnet offset, and improves sound quality stability. Third, by extending the magnetic core laterally and suspending the magnet vertically, combined with the positioning groove and receiving cavity inside the housing, the present invention achieves precise positioning and compact layout of the magnetic circuit assembly, which is beneficial to the miniaturization and integrated design of the speaker.

[0016] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a three-dimensional schematic diagram of the overall structure from another angle of an embodiment of the present invention; Figure 3 This is a cross-sectional view of an embodiment of the present invention; Figure 4 This is an exploded view of an embodiment of the present invention; Figure 5 This is another exploded view of an embodiment of the present invention; Figure 6 This is another exploded view of an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 10 housing; 11 mounting cavity; 12 annular positioning step; 13 receiving cavity; 14 first positioning groove; 15 second positioning groove; 16 through hole; Magnetic core 20; vertical part 21; upper horizontal part 22; lower horizontal part 23; Coil 30; Magnet 40; Spring clip 50; First vertical plate portion 51; Second vertical plate portion 52; Horizontal plate portion 53; Gap 60; Tie rod 70; Vibrating diaphragm 80; Protective cover 90; Sound outlet 91; Annular protrusion 92; Cavity 101; front acoustic cavity 102; diaphragm ring 103. Detailed Implementation

[0019] In the description of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "inner," and "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, they are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0020] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of the horn magnetic circuit structure provided in the embodiment of the present invention.

[0021] The speaker's magnetic circuit structure includes a housing 10 and a magnetic circuit assembly mounted on the housing 10. The magnetic circuit assembly includes a magnetic core 20, a coil 30, a magnet 40, and a spring 50. The coil 30 is sleeved on the magnetic core 20. The magnet 40 is located on one side of the magnetic core 20 and maintains a gap 60 with the magnetic core 20. The magnet 40 is connected to the housing 10 via the elastic spring 50. One end of the magnet 40 is used to connect to the speaker's diaphragm 80. When the coil 30 is energized, the magnetic field generated interacts with the magnetic field of the magnet 40, causing the magnet 40 to move and thus driving the diaphragm. The diaphragm 80 vibrates; by combining the coil 30 with the magnetic core 20 and connecting the magnet 40 to the diaphragm 80 of the speaker, the coil 30 and the diaphragm 80 of the speaker are set separately, so that the voice coil of the speaker is not bonded to the diaphragm, the wire diameter of the voice coil (i.e., the coil 30) can be increased, and it is not affected by the magnetic gap 60, which indirectly improves the power of the speaker. In addition, the voice coil is less likely to break, which improves the quality. The simple combination improves the yield and reduces the cost. It can reduce the amount of magnets used, further reducing the cost. Compared with the amount of magnets used in traditional speakers, the present invention can reduce the amount of magnets used by 50%-60%.

[0022] One end of the magnet 40 can be glued to a pull rod 70, which is used to connect to the diaphragm 80 of the speaker. The pull rod 70 can be glued to the diaphragm 80.

[0023] The magnetic core 20 extends laterally within the housing 10, and one end of the magnetic core 20 is fixedly connected to the housing 10; the magnet 40 extends vertically and is suspended within the housing 10. The coil 30 (i.e., the voice coil) is detached from the diaphragm and is disposed beside the magnet 40. The axis of the coil 30 is parallel to the diaphragm 80 of the speaker, and the axial direction of the coil 30 is perpendicular to the extending direction of the magnet 40.

[0024] The magnetic core 20 is preferably made of silicon steel sheet. Using silicon steel sheet material reduces hysteresis loss and eddy current loss and improves magnetic circuit efficiency. Of course, the magnetic core 20 can also be made of other materials, such as iron-nickel alloy. It can be set according to the actual use requirements.

[0025] The housing 10 has a mounting cavity 11, the magnetic circuit assembly is installed in the mounting cavity 11, and a vibrating diaphragm 80 is disposed in the mounting cavity 11; the vibrating diaphragm 80 and the magnetic circuit assembly are arranged at a distance to form a cavity 101; one end of the magnet 40 is connected to the vibrating diaphragm 80 through the aforementioned pull rod 70.

[0026] The opening of the mounting cavity 11 is covered with a cover 90, which covers the vibrating diaphragm 80. A front acoustic cavity 102 is formed between the cover 90 and the vibrating diaphragm 80. The cover 90 is provided with a plurality of sound outlet holes 91.

[0027] The mounting cavity 11 has a circular structure. An annular positioning step 12 is formed on the inner peripheral sidewall of the mounting cavity 11. The bottom of the annular positioning step 12 extends to the inner bottom wall of the mounting cavity 11. The lower end of the vibrating diaphragm 80 abuts against the upper end of the annular positioning step 12. A membrane ring 103 is provided at the upper end of the vibrating diaphragm 80. The lower end of the membrane ring 103 abuts against the upper periphery of the vibrating diaphragm 80. An annular protrusion 92 is provided on the lower periphery of the cover 90. The lower end of the annular protrusion 92 abuts against the upper end of the membrane ring 103.

[0028] The housing 10 has a receiving cavity 13 communicating with the mounting cavity 11. The receiving cavity 13 has a circular structure and is recessed downward from the inner bottom of the mounting cavity 11. The vibrating diaphragm 80 is arranged at a distance from the inner bottom of the mounting cavity 11 to form the cavity 101. The magnetic circuit assembly is installed in the receiving cavity 13. A first positioning groove 14 and a second positioning groove 15 are respectively provided on opposite sides of the inner peripheral sidewall of the receiving cavity 13. The upper end of the first positioning groove 14 communicates with the mounting cavity 11, and one end of the magnetic core 20 is embedded and positioned in the first positioning groove. Inside the housing 14, the other end of the magnetic core 20 extends laterally into the receiving cavity 13, the coil 30 is sleeved on the other end of the magnetic core 20, one end of the spring piece 50 is embedded in the second positioning groove 15, the other end of the spring piece 50 extends laterally into the receiving cavity 13, and the magnet 40 is connected to the other end of the spring piece 50; thus, the first positioning groove 14 and the second positioning groove 15 provided inside the housing 10 are used to fix the magnetic core 20 and the spring piece 50 respectively, which facilitates positioning and fixing during assembly, and improves production efficiency and product consistency.

[0029] The magnetic core 20 includes a vertical portion 21, an upper horizontal portion 22, and a lower horizontal portion 23. The upper horizontal portion 22 and the lower horizontal portion 23 are integrally connected to the upper and lower ends of the vertical portion 21, respectively. The vertical portion 21 is positioned in the first positioning groove 14. The upper horizontal portion 22 and the lower horizontal portion 23 extend laterally into the receiving cavity 13. The coil 30 is sleeved on the upper horizontal portion 22, and the lower horizontal portion 23 abuts against the inner bottom wall of the receiving cavity 13.

[0030] The spring piece 50 includes a first vertical plate portion 51, a second vertical plate portion 52, and a horizontal plate portion 53. The first vertical plate portion 51 and the second vertical plate portion 52 are integrally connected to both ends of the horizontal plate portion 53. The first vertical plate portion 51 is positioned in the second positioning groove 15. The horizontal plate portion 53 extends laterally into the receiving cavity 13. The magnet 40 can be connected to the second vertical plate portion 52 by adhesive.

[0031] The bottom of the housing 10 is provided with a through hole 16 communicating with the receiving cavity 13, and the magnet 40 is arranged facing the through hole 16. The arrangement of the magnet 40 facing the through hole 16 at the bottom of the housing 10 is conducive to the smooth propagation of sound and further optimizes the sound output effect.

[0032] A tuning element can be covered on the outer side of the through hole 16 on the housing 10. The tuning element is preferably designed to be circular, but it can also be designed to be other shapes. The tuning element can be sound-absorbing paper, tuning mesh cloth, tuning iron mesh, etc., or it can be a tuning element made of other materials. The design can be selected according to the actual production needs. In this way, the combination design of the through hole 16 and the tuning element can facilitate tuning.

[0033] In summary, the key design features of this invention are as follows: By combining the coil and magnetic core and connecting the magnet to the speaker's diaphragm, while separating the coil from the diaphragm, the speaker's voice coil is prevented from bonding to the diaphragm. This allows for an increase in the voice coil (i.e., coil) wire diameter and is unaffected by magnetic gaps, indirectly increasing speaker power. Furthermore, the voice coil is less prone to breakage, improving quality. The simple assembly increases yield and reduces costs, and the amount of magnet used can be reduced, further lowering costs. By connecting the magnet to the housing via a spring and connecting one end to the diaphragm, this invention achieves direct drive of the diaphragm by the magnet, reducing energy transfer loss and improving vibration response speed and acoustic efficiency. Moreover, the elastic connection of the spring gives the magnet better self-balancing ability during vibration, reducing vibration distortion caused by magnet misalignment and improving sound quality stability. By extending the magnetic core laterally and suspending the magnet vertically, combined with the positioning groove and receiving cavity inside the housing, this invention achieves precise positioning and compact layout of the magnetic circuit components, which is beneficial for the miniaturization and integrated design of the speaker.

Claims

1. A horn magnetic circuit structure, characterized in that: The device includes a housing and a magnetic circuit assembly mounted on the housing. The magnetic circuit assembly includes a magnetic core, a coil, a magnet, and a spring. The coil is sleeved on the magnetic core. The magnet is located on one side of the magnetic core and maintains a gap with the magnetic core. The magnet is connected to the housing through the spring. One end of the magnet is used to connect to the diaphragm of a speaker.

2. The horn magnetic circuit structure according to claim 1, characterized in that: The magnetic core extends laterally within the housing, and one end of the magnetic core is fixedly connected to the housing; the magnet extends vertically and is suspended within the housing.

3. The horn magnetic circuit structure according to claim 1, characterized in that: One end of the magnet is connected to a pull rod, which is used to connect to the diaphragm of the speaker.

4. The horn magnetic circuit structure according to claim 1, characterized in that: The housing has a mounting cavity, the magnetic circuit assembly is mounted in the mounting cavity, a vibrating diaphragm is disposed in the mounting cavity, the vibrating diaphragm is arranged at a distance from the magnetic circuit assembly, and one end of the magnet is connected to the vibrating diaphragm.

5. The horn magnetic circuit structure according to claim 4, characterized in that: The housing has a receiving cavity communicating with the mounting cavity. The magnetic circuit assembly is installed in the receiving cavity. A first positioning groove and a second positioning groove are respectively provided on opposite sides of the inner peripheral sidewall of the receiving cavity. One end of the magnetic core is positioned in the first positioning groove, and the other end of the magnetic core extends laterally into the receiving cavity. The coil is sleeved on the other end of the magnetic core. One end of the spring is positioned in the second positioning groove, and the other end of the spring extends laterally into the receiving cavity. The magnet is connected to the other end of the spring.

6. The horn magnetic circuit structure according to claim 5, characterized in that: The magnetic core includes a vertical part, an upper horizontal part, and a lower horizontal part. The upper horizontal part and the lower horizontal part are respectively connected to the upper and lower ends of the vertical part. The vertical part is positioned in the first positioning groove. The upper horizontal part and the lower horizontal part extend laterally into the receiving cavity. The coil is sleeved on the upper horizontal part, and the lower horizontal part abuts against the inner bottom wall of the receiving cavity.

7. A horn magnetic circuit structure according to claim 5, characterized in that: The spring includes a first vertical plate, a second vertical plate, and a horizontal plate. The first vertical plate and the second vertical plate are respectively connected to the two ends of the horizontal plate. The first vertical plate is positioned in the second positioning groove. The horizontal plate extends laterally into the receiving cavity. The magnet is connected to the second vertical plate.

8. A horn magnetic circuit structure according to claim 5, characterized in that: The bottom of the housing is provided with a through hole that connects to the receiving cavity, and the magnet is arranged opposite the through hole.

9. A horn magnetic circuit structure according to claim 4, characterized in that: The opening of the mounting cavity is covered with a protective cover, which covers the vibrating diaphragm. A front acoustic cavity is formed between the protective cover and the vibrating diaphragm, and multiple sound outlet holes are provided on the protective cover.

10. A horn magnetic circuit structure according to claim 1, characterized in that: The magnetic core is made of silicon steel sheet.

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