CN203057431U - Single-magnet bone-conduction headphone device - Google Patents

Abstract

The utility model discloses a bone conduction earphone device with a single magnet. The device includes a vibration system composed of a vibration transmission plate and a vibration plate; a voice coil is fixedly arranged on the vibration plate; plate, a magnet is arranged on the outer magnetic conductive plate, an inner magnetic conductive plate is arranged on the magnet, and a gap is formed between the inner magnetic conductive plate and the outer magnetic conductive plate; the voice coil is set within the gap. The single-magnet bone conduction earphone device of the utility model adopts a single magnet and an integrally arranged outer magnetically conductive plate, which simplifies the structure of the product, and can realize the assembly of the magnet without magnetization during processing, and then charge it after assembly. Magnetic processing methods improve production efficiency and product yield.

Description

A single magnet bone conduction earphone device

technical field

The utility model relates to a bone conduction earphone device, in particular to a single magnet bone conduction earphone device.

Background technique

In the prior art, bone conduction earphones are usually used in special applications, such as police or military communication equipment, but with the gradual development of technology, they are currently being extended to civilian applications. Because its conduction method is through bone vibration, bone conduction earphones have strong resistance to noise interference, so they are especially suitable for use in noisy outdoor environments. For civilian technology, the use of earphones usually needs to take into account sound quality issues. Therefore, the current bone conduction earphones have not made a good breakthrough in this direction (police or military bone conduction earphones do not need a wide frequency response to Enhance the sound quality, but only need to be clear, so it will not pursue sound quality, its frequency response range is very narrow, and considering the requirements of durability, cost, assembly process, etc., it generally adopts a moving iron structure that is difficult for civilian use technology).

As shown in Fig. 1 and Fig. 2, the applicant is applying for a bone conduction loudspeaker and its composite vibration device for civilian use. The driver is provided with: a vibrating system formed by a vibration transmission sheet 15 and a vibration plate 16, a panel 21 is arranged on the vibration transmission sheet 15, and the vibration transmission sheet 15 has a thin thickness and can increase elastic force, and the vibration transmission sheet 15 is stuck on the vibration plate 16 center card slot settings. The panel 21 is engaged in the central position of the vibration transmission piece 15 and the vibration plate 16; the voice coil 19 is bonded to the lower side of the vibration plate 16; the annular magnetic plate 18, the annular magnet 22, the inner magnetic The plate 20, the inner magnet 23 and the bottom plate 24 constitute a magnetic system. A washer 17 is also arranged between the vibration transmitting piece 15 and the annular magnetic conducting plate 18, thereby forming a compound vibration audio unit.

The inner magnet 23 and the ring magnet 22 are also arranged on the base plate 24, the inner magnet 23 is arranged at the center of the ring magnet 22, and there is a gap between the ring magnet 22, and the ring magnet 22 Set to polar opposite direction setting. The inner magnetically conductive plate 20 is fixedly arranged on the top surface of the inner magnet 23, and the annular magnetically conductive plate 18 is fixedly installed on the top surface of the ring magnet 22 at the same time, and the inner magnetically conductive plate 18 and the inner magnetically conductive plate There is also a gap between the plates 20 , which is communicated with the gap between the inner magnet 23 and the ring magnet 22 . The voice coil 19 extends downwards and is disposed in the gap.

The bone conduction earphones in the prior art adopt a double-magnet structure consisting of an annular magnet 22 and an inner magnet 23, and the polarity of the magnetic field is arranged in the opposite manner. For example, when the upper end of the inner magnet 23 is an N pole and the lower end is an S pole, the annular The magnet 22 will adopt the arrangement mode that the upper end is the S pole, and the lower end is the N pole. On the contrary, when the upper end of the inner magnet 23 is the S pole and the lower end is the N pole, the ring magnet 22 will adopt the upper end as the N pole and the lower end as the S pole. The inner magnetically permeable plate 20 and the annular magnetically permeable plate 18 above the magnet also produce opposite polarities because of the effect of the corresponding magnet.

In the gap between the inner magnetic guide plate 20 and the annular magnetic guide plate 18 of the voice coil 19, the magnetic force lines in the magnetic system will not expand outward due to the action of a single magnet, and the magnetic force lines will only concentrate on the inner magnetic guide plate 20 and the annular magnetic guide plate 20. In the gap of the magnetic plate 18. Therefore, after the voice coil 19 is applied with an AC signal (that is, the current signal of the sound), there is a greater force in the closed magnetic field to perform longitudinal reciprocating motion, thereby achieving the effect of improving the sensitivity of the bone conduction speaker. The wire 191 of the voice coil 19 passes through the wire hole 211 provided on the panel 21 into the bone conduction earphone.

The bone conduction earphones in the prior art adopt the double magnet structure of the ring magnet 22 and the inner magnet 23. Since the bone conduction earphone needs to increase the sensitivity of the loudspeaker, a stronger magnetic magnet must be used. Assembled on the bottom plate 24, but due to its magnetic properties, it is extremely difficult to assemble the product. During the assembly process, the ring magnet 22 and the inner magnet 23 are likely to be attracted to each other, causing the magnet assembly to deviate from the designed position, making it difficult to guarantee product quality, or due to excessive attraction. cause the magnet to break. And because the annular magnet 22 and the inner magnet 23 need the arrangement mode of the opposite magnetic polarity, they cannot be processed by the mode of first assembling and then magnetizing.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

The purpose of this utility model is to provide a bone conduction earphone device with a single magnet, and to provide an improved solution for the defects of the above-mentioned prior art, so as to realize convenient processing and improve product processing efficiency.

The technical scheme of the utility model is as follows:

A bone conduction earphone device with a single magnet, which includes a vibration system composed of a vibration transmission piece and a vibration plate; the vibration transmission piece includes a ring body, and a plurality of struts are arranged between the ring body and its center part; a voice coil is fixedly arranged on the vibrating plate; the vibration-transmitting sheet is set as a first torus, and at least two first struts converging toward the center in the first torus; the The vibrating plate is set as a second torus, and at least two second struts converging toward the center in the second torus; the vibration transmission piece and the vibrating plate are fixed together; the first circular The ring body is fixed on a magnetic system; wherein, the magnetic system includes an outer magnetic conductive plate, a magnet is arranged on the outer magnetic conductive plate, an inner magnetic conductive plate is arranged on the magnet, and an inner magnetic conductive plate is arranged on the outer magnetic conductive plate. A gap is formed between the inner magnetic conductive plate and the outer magnetic conductive plate; the voice coil is arranged in the gap.

In the bone conduction earphone device, a washer is further arranged on the ring body of the vibration transmission plate, and the other side of the washer is supported on the edge of the outer magnetic conductive plate.

The bone conduction earphone device, wherein, the vibrating plate is provided with a locking groove that is engaged with the vibration transmitting plate.

In the bone conduction earphone device, a recess is provided on the outer magnetic conductive plate, and the magnet is arranged in the recess.

In the bone conduction earphone device, a stepped portion for fitting the magnet is provided in the concave portion of the outer magnetic conductive plate.

In the bone conduction earphone device, a wire hole for a wire passing through the voice coil is provided at the center of the face plate, the vibration transmission piece and the vibration plate.

The bone conduction earphone device, wherein, the first torus and the second torus are provided with three struts respectively, and the struts on the same torus are arranged in a 120-degree distribution with each other It is connected between the center and the ring body on the periphery of the torus.

The bone conduction earphone device, wherein, the inner magnetically conductive plate is flush with the edge of the outer magnetically conductive plate.

The bone conduction earphone device with a single magnet provided by the utility model adopts an external magnetic plate and a single magnet integrated in the bone conduction earphone of the composite vibration system, which simplifies the structure of the product and ensures the performance and quality of the product. At the same time, it can realize thinner and smaller product design, and can realize the processing method of assembling the magnet without magnetization first during processing, and then magnetizing it after assembly, so as to improve production efficiency and product yield.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a bone conduction earphone in the prior art.

FIG. 2 is a three-dimensional exploded schematic view of the prior art bone conduction earphone shown in FIG. 1 .

Fig. 3 is a sectional view of a preferred embodiment of the bone conduction earphone of the present invention.

FIG. 4 is a three-dimensional exploded schematic view of a preferred embodiment of the bone conduction earphone of the present invention.

FIG. 5 is a schematic diagram showing the distribution of magnetic force lines of a bone conduction earphone in the prior art.

FIG. 6 is a schematic diagram of the distribution of magnetic force lines of the bone conduction earphone of the present invention.

Detailed ways

Preferred embodiments of the present utility model are described in detail below.

As shown in Fig. 3 and Fig. 4, it is the bone conduction earphone device of the utility model improved technical solution, and its driver unit setting includes: a vibration system composed of a vibration transmission piece 26 and a vibration plate 27, a panel is arranged on the vibration transmission piece 26 25, wherein the vibration transmitting piece 26 must have a relatively thin thickness, and can increase the elastic force. The vibration transmitting piece 26 can be clamped in the central clamping groove 271 of the vibration plate 27 for assembly. The vibration transmitting piece 26 includes a ring body portion 261, as shown in FIG. strut. The shape of the struts 262 can be set as a straight line with a distribution of 120 degrees, or can be set as another line shape, such as an arc or an S shape, to increase flexibility.

It should be noted that the above-mentioned vibration transmitting piece 26 is set as a first circular body, in which three first struts 262 are set converging toward the center; the vibrating plate 27 is set as a second circular body. Ring body, in which three second struts 272 are set converging towards the center; the vibration transmission piece and the vibration plate are fixed together to form a composite vibration system, which can form a wider The frequency response forms two resonant peaks in the low frequency and high frequency, so as to meet the sound quality requirements of civilian bone conduction headphones.

The first torus can be used to generate a low-frequency frequency response, therefore, its struts and other parts are made of thinner materials, such as metal plates; the second torus can be used to generate a high-frequency frequency response , therefore, its strut is made of a thicker material, such as plastic. Of course, the first torus and the second torus are not limited to the corresponding responses of the above-mentioned low frequency and high frequency, as long as two different frequency responses can be generated; and, the first torus and the second torus The struts of the second torus are arranged in a staggered manner, because the struts of the second torus are relatively thick, so that assembly can be facilitated.

The first ring body is fixed on a magnetic system, and the fixing method of the vibration transmitting piece 26 and the vibration plate 27 is not limited to the way of fitting with a slot, and other fixing methods can be used if the processing requirements are met. methods, such as pasting or welding.

In the magnetic system of the present utility model, the panel 25 is arranged as a planar structure or an arc structure, and is engaged in the central position of the vibration transmitting piece 26 and the vibration plate 27; The lower side is a voice coil 28; the magnetic guide plate 30, the magnet 31 and the outer magnetic guide plate 32 form the magnetic system, and a step portion 321 is arranged at the center of the outer magnetic guide plate 32, and its inner bottom is set to be lower thinner, thereby forming a recess portion 322 for placing the magnet 31 . An edge 323 extends upward from the periphery of the outer magnetic conductive plate 32 to form a larger magnetic field. Of course, in fact, the step portion 321 and the dimple portion 322 may not be provided. The disposition of the dimple portion 322 facilitates assembly, but it will also lead to weakening of the magnetic field. Therefore, dimple portions 322 of different depths can be designed and adjusted as required. , even the dimple may not be provided in the product.

The magnet 31 is fixed in the recess portion 322 by bonding, and the inner magnetically permeable plate 30 is fixedly arranged on the center of the magnet 31, and the outer magnetically permeable plate 32, the inner magnetically permeable plate 30 and the magnet 31 are formed The gap 324 is shown in FIG. 3 , and the voice coil 28 extends downwards and is placed in the gap. When the audio signal is energized to the voice coil 28 through the audio circuit to generate current induction, the magnetic field strength formed by the gap causes the inductance to change accordingly, causing the voice coil 28 to drive the vibration system to move back and forth longitudinally, and causing the vibration plate 27 Vibration, so that the vibration is transmitted to the vibration transmission piece 26, and finally the sound vibration is transmitted to the human bone through the contact of the panel 25 with the back of the human ear, the cheek or the forehead, so that the sound is induced by the human body through bone conduction.

For the convenience of assembly, in the bone conduction earphone device described in the present invention, the magnet 31 can be a magnet that has not been pre-magnetized before assembly, so that the panel, the vibration transmission piece, the vibration plate and the voice coil are first assembled during assembly. And the outer magnetic conducting plate, the magnet and the inner magnetic conducting plate are assembled in sequence; the assembled bone conduction earphone device is sent to the magnetizing machine for magnetizing the magnet, so that the magnet 31 obtains magnetism. Because the magnet 31 has no magnetism before assembly, there is no magnetic interference during assembly, and the assembly is easy, and after assembly, the magnet 31 is magnetically charged, combined with the above-mentioned single magnet structure of the utility model, it can facilitate the production of products. assembly, and the product yield after assembly is high.

In the bone conduction earphone device described in the present invention, a gasket 29 is also provided between the ring body portion 261 of the vibration transmission piece 26 and the edge 323 of the outer magnetic plate 32. The gasket 29 can be made of, but not limited to, plastic material, which can be used to raise the gap 324 so as to make the coil length of the voice coil 28 longer. The setting of the washer 29 facilitates the assembly of the vibration-transmitting piece 26, so that the vibration-transmitting piece 26 can be set to be made of a thinner material, so that a low-frequency frequency response can be formed; because the low-frequency frequency response requires a thinner material, Simultaneously, the vibration transmission piece 26 and the vibration plate 27 are fixed together, together with the voice coil 28 to form a sounding vibration system, the vibration transmission piece 26 will be difficult to support, and due to the use of the washer 29, the supportable force of the vibration transmission piece 26 has been realized assembly. To facilitate the assembly of the voice coil 28 , a wire hole 251 for passing through the voice coil wire 281 is provided at the center of the panel, the vibration transmitting plate and the vibration plate, as shown in FIG. 3 .

The bone conduction earphone device and processing method of the utility model change the double magnet scheme of the prior art into a single magnet scheme, and its technical advantages include:

One is to form a thinner and smaller bone conduction earphone device.

Due to the processing problem of the magnet, the thinnest wall thickness processing of the ring magnet 22 also needs to be 1.5 mm, but if the ring magnet 22 is not used but the outer magnetic plate 32 is used, because the outer magnetic plate 32 can be processed by a lathe (but not limited to Lathe processing), its wall thickness can be 0.5mm, of course, it can also be thinner, even less than 0.5mm can be easily processed and formed. This is of great help to reduce the volume of the bone conduction earphone device, and of course the cost is also reduced a lot.

The outer magnetic guide plate 32 of the utility model is equivalent to synthesizing the annular magnetic guide plate 18, the annular magnet 22 and the bottom plate 24 in the previous technical solution into one component, so as to simplify the assembly process; in addition, the price of the annular magnet 22 is also much higher than that of the outer guide The price of the magnetic plate 32 is much higher than iron because of the rare earth element price in the magnet.

The second is that the bone conduction earphone device of the present invention can still ensure the working state of the bone conduction earphone device without a magnet.

When the prior art scheme adopts the scheme of double magnets, the magnetic field strength B of the double magnets is larger than that of the single magnets. After a large reduction, the voice coil 28 is larger than the total voice coil 19 of the dual-magnet structure, that is, the length L of the voice coil becomes much longer when the impedance and the height of the voice coil are consistent.

According to the physical definition, for a section of conducting wire perpendicular to the magnetic field, the size F of the Ampere force in the magnetic field is proportional to the product of the current intensity I and the length L of the wire, that is, F=BIL. As shown in Figure 5, it is a schematic diagram of the magnetic field distribution of the prior art double magnet, and Figure 6 is a schematic diagram of the magnetic field distribution of the utility model single magnet, as can be known by actual measurement, the magnetic field strength of the double magnet is greater than that of the single magnet. But according to the calculation and derivation of the length of the voice coil, according to the law of resistance: R=ρL/S where L is the length of the wire; S is the cross-sectional area, the cross-sectional area = π*the square of the radius of the bare wire (the bare wire is the enameled wire with the insulating paint removed ); ρ is the resistivity of the copper wire, which can be obtained by looking up the table. According to table look-up and calculation under a certain impedance height, it can be seen that the voice coil length L of the double magnet is smaller than the voice coil length of the single magnet.

Finally, it is found in practical applications that the force F of the voice coil in the dual-magnet magnetic field in the prior art is no greater than or even smaller than the force generated in the single-magnet magnetic field. The sensitivity of the voice coil is often designed as a double magnet method, which will strengthen the magnetic properties of the two magnets, but this increases the difficulty of processing and assembly and the product defect rate. The utility model adopts the structural setting method of a single magnet, and finds that the position where the coil cuts the magnetic force line in the magnetic field is basically not affected by the magnet on the other side, and a sufficient gap can be formed. By lengthening the length of the voice coil coil, the bone conduction earphone can be achieved Sensitivity requirements.

Third, the assembly process of the bone conduction earphone device of the present invention is simplified.

Because the ring magnet 22 and the inner magnet 23 with double magnets are used in the prior art bone conduction earphone device, the polarities of the magnetic fields are arranged in the opposite manner. During the assembly process, the two magnets must be magnetized first due to the opposite polarity. Then assemble it. In order to obtain a high-sensitivity bone conduction speaker, the magnetic effect of the magnet is very strong. The two magnets are easily attracted during assembly and cause eccentricity during assembly, which makes the sound quality and volume very poor, resulting in a high product defect rate. high.

Moreover, because the ring magnet 22 in the prior art has a very thin wall thickness and the magnet material itself is very brittle, when it is attracted by the inner magnet 23 during the assembly process, it is easy to cause the ring magnet to break due to excessive attractive force. It can be seen that the structure of the double magnets is relatively difficult in the process of assembly and production, and is not suitable for mass industrial production. However, these problems do not exist in the single magnet structure of the bone conduction earphone device of the present invention. Since the structure of the single magnet has only one magnet, no magnetism is added before assembly, and it will not be difficult to assemble due to the mutual attraction of the magnets. Assembled and produced under the condition of magnetism, and then magnetized after assembly (in the bone conduction earphone processing industry, magnets are generally magnetized before assembly, and the magnets purchased by manufacturers are generally unmagnetized magnets. ), greatly speeding up the production speed and reducing the difficulty of production.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (8)

1. A bone conduction earphone device of a single magnet, which includes a vibrating system composed of a vibration-transmitting piece and a vibrating plate; the vibration-transmitting piece is provided with a ring body portion, and a plurality of ring body portions and its center are arranged A strut portion; a voice coil is fixedly arranged on the vibrating plate; the vibration-transmitting piece is set as a first torus, and at least two first struts converging toward the center in the first torus; The vibrating plate is set as a second torus, and at least two second struts converging toward the center in the second torus; the vibration transmission piece and the vibrating plate are fixed together; the first A circular body is fixed on a magnetic system; it is characterized in that, the magnetic system is provided with an outer magnetic conductive plate, a magnet is arranged on the outer magnetic conductive plate, and an inner magnetic conductive plate is arranged on the magnet , forming a gap between the inner magnetic conductive plate and the outer magnetic conductive plate; the voice coil is arranged in the gap. 2. The bone conduction earphone device according to claim 1, characterized in that, a washer is also arranged on the ring body of the vibration transmission plate, and the other side of the washer is supported on the edge of the outer magnetic conductive plate superior. 3 . The bone conduction earphone device according to claim 1 , characterized in that, the vibrating plate is provided with a card slot which is engaged with the vibration transmitting plate. 4 . 4 . The bone conduction earphone device according to claim 1 , wherein a dimple is provided on the outer magnetic conductive plate, and the magnet is arranged in the dimple. 5 . 5 . The bone conduction earphone device according to claim 4 , wherein a stepped portion for assembling the magnet is provided in the concave portion of the outer magnetic conductive plate. 6 . 6 . The bone conduction earphone device according to claim 1 , wherein a wire hole for a wire passing through the voice coil is provided at the center of the vibration transmitting plate and the vibration plate. 7 . 7. The bone conduction earphone device according to claim 1, wherein the first torus and the second torus are respectively provided with three struts, each of the struts on the same torus 120-degree distribution between each other is arranged between the center and the ring body portion on the periphery of the torus. 8 . The bone conduction earphone device according to claim 1 , wherein the inner magnetically conductive plate is flush with the edge of the outer magnetically conductive plate.

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