CN202435600U - Volume-reduced bone conduction speaker actuator - Google Patents

Abstract

The utility model discloses a volume-reduced bone conduction speaker actuator, which comprises a panel, a vibration transmission sheet, a vibrating plate and a bottom plate, wherein an inner magnet and an annular magnet are arranged on the bottom plate fixedly; an inner magnetic conduction plate is arranged on the top surface of the inner magnet fixedly; an annular magnetic conduction plate is arranged on the top surface of the annular magnet fixedly; a gap is arranged between the annular magnetic conduction plate and the inner magnetic conduction plate; a sound coil which is adhered at the lower side of the vibrating plate extends downwards to be arranged in the gap; and a washer is arranged on the top surface of the annular magnetic conduction plate and is connected with the border of the vibration transmission sheet fixedly. With the adoption of the washer and a double-magnet structure, the sensitivity of the volume-reduced bone conduction speaker actuator is improved effectively; and meanwhile, a shell is omitted, and the vibration transmission sheet is fixed on a magnetic circuit system through the washer directly, so that the effect that the bone conduction speaker actuator is reduced in volume is realized.

Description

A reduced-volume bone-conduction speaker driver

technical field

The utility model relates to a volume-reducing design scheme of a bone conduction loudspeaker driver.

Background technique

The reason why people can hear sound is because the vibration in the air transmits the vibration to the eardrum through the external ear canal, and the vibration formed by the eardrum drives the human auditory nerve.

When the bone conduction speaker works, the driver pushes the shell of the bone conduction speaker to generate vibration, and the vibration frequency is in the audio frequency range. Because the shell of the bone conduction speaker is close to the human skin, the vibration generated by the bone conduction speaker is transmitted to the human auditory nerve through the human skin, subcutaneous tissue and bone, so that people can hear the sound.

Fig. 1 is a longitudinal sectional view of the structure of a bone conduction speaker device in the prior art. The bone conduction loudspeaker generally includes: a body 1, which has a cylindrical shape with an open upper part; a yoke 2, which is arranged at the bottom inside the body 1 and has a protrusion 3 at its center; a ring magnet 4, which is formed and fixed on the yoke 2 and leave a predetermined distance from the edge of the raised portion 3; the upper plate 5, which is formed and contacts the upper side of the magnet 4; the mastoid protrusion 9, which contacts the bone conduction part of the user, and Vibration, through which sound is transmitted to the user; acoustic vibration plate 8, which is inserted in the lower side of the mastoid 9 to cover the opening part of the body 1, and is made of elastic material; auxiliary vibration plate 7, which is inserted in the underside of the mastoid 9 Below, set between the mastoid 9 and the acoustic vibrating plate 8; the voice coil 6, which is connected with the auxiliary vibrating plate 7, and inserted between the edge of the raised portion 3 of the yoke 2 and the ring magnet 4; the front cover 10, It is used to fix the acoustic vibrating plate 8 on the body 1 ; and the electrical signal input units 12 , 13 and 14 can be used to input electrical signals to the voice coil 6 .

In this bone conduction speaker, the acoustic vibrating plate 8 is fixed on the body 1 so that the voice coil 6 can vibrate between the edge of the raised portion 3 of the yoke 2 and the gap formed by the ring magnet 4 . It can be seen that the main body 1 is a key component that forms a gap between the vibration system and the magnetic system to generate vibration. The ring magnet 4 energizes the voice coil 6 to generate current induction and the magnetic field strength changes, and the inductance also changes accordingly, thus causing the auxiliary vibrating plate 7 to vibrate longitudinally, and the acoustic vibrating plate 8 also moves along with the auxiliary vibrating plate. 7, and then the vibration of the acoustic vibrating plate 8 is transmitted to the mastoid 9 so that the mastoid 9 vibrates. The vibration of the mastoid 9 is transmitted through the bone of the user to stimulate the auditory nerve, thereby allowing the person to hear sound.

However, since the periodic vibration of the vibration plate of the bone conduction speaker driver requires a gap for longitudinal movement, the existing technology has to generate the required movement space through the support of the acoustic vibration plate and the shell or body, which also increases the size of the device. As a result, the overall volume of the final earphone device has increased, making it impossible to develop in the direction of miniaturization. In addition, the magnet structure in the prior art is a single magnet structure, that is, there is only the ring magnet 4, and the yoke 2 is a magnetizer, so the magnetic flux leakage is large, and there is no sufficient magnetic flux distribution, which limits the bone conduction while reducing the volume. The sensitivity of the speaker.

The smaller the size of the bone conduction speaker, the wider the market application. However, the smaller the size of the bone conduction speaker, the lower the sensitivity. Therefore, how to reduce the size of the bone conduction speaker as much as possible while keeping the sensitivity constant or even higher becomes a meaningful problem.

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

Utility model content

The purpose of this utility model is to provide a bone conduction speaker driver with reduced volume, improve the existing bone conduction speaker, cancel the shell and directly fix the vibration transmission plate on the improved magnetic circuit system by adding gaskets, so as to realize bone conduction Conducted loudspeaker driver volume reduction solution.

The technical scheme of the utility model comprises:

A volume-reduced bone conduction speaker driver, which includes a panel, a vibration transmission piece, and a vibration plate, wherein the panel is engaged in the center of the vibration transmission piece and the vibration plate; and, a bottom plate, An inner magnet and a ring magnet are fixedly arranged on the bottom plate, the inner magnet is arranged at the center of the ring magnet, and there is a gap between the ring magnet; the inner magnet is fixedly arranged on the top surface of the inner magnet A ring-shaped magnetically conductive plate is fixedly arranged on the top surface of the ring-shaped magnet, and a gap is provided between the annular magnetically-conducted plate and the inner magnetically-conducted plate; a voice coil bonded on the lower side of the vibrating plate is downward an extension is disposed in the gap;

Moreover, a washer is arranged on the top surface of the ring-shaped magnetically conductive plate, and is fixedly connected to the edge of the vibration-transmitting sheet.

In the bone conduction speaker driver, a through hole is provided in the center of the panel for leading out the wires of the voice coil.

The bone conduction speaker driver, wherein, the panel is arranged in a planar structure or an arc-shaped structure.

The bone conduction speaker driver, wherein, the vibrating plate is provided with a groove for engaging the vibrating plate.

The bone conduction speaker driver, wherein the components of the bone conduction speaker driver are bonded by glue.

The utility model provides a reduced-volume bone conduction speaker driver, which effectively improves the sensitivity of the bone conduction speaker driver due to the use of gaskets and double magnet structures; It is fixed on the magnetic circuit system, thereby realizing the effect of reducing the volume of the bone conduction speaker driver. Because the utility model adopts a double magnet structure, the distribution of its magnetic lines of force is to close the magnetic circuit, so that the magnetic flux leakage is extremely small, and the magnetic flux distribution of the magnetic circuit is also increased, resulting in increased sensitivity.

Description of drawings

FIG. 1 is a longitudinal sectional view of the structure of a bone conduction speaker device in the prior art.

Fig. 2 is a longitudinal sectional view of the bone conduction speaker driver structure of the present invention.

FIG. 3 is an exploded perspective view of the bone conduction speaker driver structure of the present invention.

FIG. 4 is a perspective view of the bone conduction speaker driver structure of the present invention.

Detailed ways

Below in conjunction with the accompanying drawings, various preferred embodiments of the present utility model will be described in more detail.

In the preferred embodiment of the bone conduction loudspeaker driver with reduced volume of the present invention, as shown in Fig. 2 and Fig. 3, the shell of the prior art is omitted, and its structure is adjusted. The driver configuration includes: panel 21, The vibration system of the vibration transmission sheet 15 and the vibration plate 16, the vibration transmission sheet 15 has a thin thickness and can increase the elastic force, the vibration transmission sheet 15 is set in the center of the groove of the vibration plate 16, and the panel 21 is arranged as a planar structure Or arc-shaped structure, and snapped on the central position of the vibration transmission piece 15 and the vibration plate 16; the voice coil 19 is bonded on the lower side of the vibration plate 16; the ring magnetic plate 18, the ring magnet 22, the inner The magnetic plate 20, the inner magnet 23 and the base plate 24 form a magnetic system, the inner magnet 23 and the ring magnet 22 are 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, the inner magnetic guide plate 20 is fixedly installed on the top surface of the inner magnet 23, and the ring magnetic guide plate 18 is fixedly installed on the top surface of the ring magnet 22. A gap is also provided between the ring-shaped magnetic conducting plate 18 and the inner magnetic conducting plate 20 , and the voice coil 19 extends downwards and is disposed in the gap.

The vibration system is connected to the magnetic system through a gasket 17, which is arranged on the top surface of the annular magnetic plate 18, and is fixedly connected to the edge of the vibration-transmitting sheet 15; the bone conduction speaker is connected to the outside through a panel 21 , and then transmit the vibration to the human bone, the panel 21 is stuck in the center of the vibration transmission piece 15 and the vibration plate 16 and arranged. The complete bone conduction loudspeaker driver part of the utility model is shown in FIG. 4 .

In the volume-reduced bone conduction loudspeaker driver described in the utility model, the annular magnetic plate 18, the annular magnet 22, the inner magnetic plate 20, the inner magnet 23 and the base plate 24 form a magnetic system, which is generated when the voice coil 19 is energized. The intensity of the magnetic field induced by the current changes accordingly, and the inductance also changes accordingly, causing the voice coil 19 to move back and forth longitudinally, and causing the vibration plate 16 to vibrate, thereby transmitting the vibration to the vibration transmission plate 15, and finally through The panel 21 is in contact with parts such as the back of the human ear, the cheek or the forehead, and transmits the vibration to the human bone, thereby generating sound.

The utility model adopts a double magnet structure consisting of a ring 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 ring magnet 22 will use the upper It is the S pole, and the lower end is the setting method of 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 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 AC signal is applied to the voice coil 19, 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 utility model adopts the double magnet structure of the annular magnet 22 and the inner magnet 23, and the distribution of the magnetic lines of force closes the magnetic circuit, so that the magnetic flux leakage is extremely small, and the magnetic flux distribution of the magnetic circuit is also increased, resulting in increased sensitivity.

In a preferred embodiment of the present utility model, as shown in FIG. 2, in the bone conduction speaker driver, a through hole 211 is provided in the center of the panel 21, and corresponding vibrating plates 15 and vibrating plates 16 are provided with corresponding The perforation is used to lead out the wire 191 of the voice coil 19. This arrangement can make the wire 191 vibrate together with structures such as the voice coil and the vibration-transmitting plate, so as to avoid the problem that the wire is broken by vibration in the prior art. This technical structure is different from the existing technology. In the existing technology, the voice coil wire is slotted from the side to the connecting terminal, while the voice coil wire is suspended and straightened at a distance in the middle. When the signal is input, the vibrating part together with the voice coil The wires move back and forth axially together, which may easily cause the wires to vibrate and break.

In the preferred embodiment of the bone conduction speaker driver described in the present invention, its components can be bonded by glue, which is very helpful for reducing the volume, because it reduces the use of screws or injection molding. The increase in volume caused by assembly.

The utility model adds a washer 17 and cancels the body of the prior art to fix the acoustic vibrating plate directly on the washer, which reduces the volume of the bone conduction loudspeaker driver, has simple process and low cost; the obtained bone conduction Since the loudspeaker cancels the main body, it avoids the problem of increasing the weight of the driver due to the increase in the volume of the shell, and promotes its development in the direction of miniaturization; the double magnet structure is added, which effectively improves the sensitivity of the bone conduction speaker driver. Thereby expanding the application of bone conduction speakers in commercial fields such as communication equipment.

It should be understood that the above description of the preferred embodiments of the utility model is more specific, and should not be considered as a limitation of the scope of protection of the patent of the utility model. The scope of protection of the patent of the utility model should be subject to the appended claims.

Claims (5)

1. bone-conduction speaker driver that reduces volume, its setting comprises a panel, vibration-transmitting plate and oscillating plate, it is characterized in that, said panel is fastened on the center of said vibration-transmitting plate and said oscillating plate; And a base plate is set with an inner magnet and a toroidal magnet on said base plate, and said inner magnet is arranged on the center of said toroidal magnet, and and toroidal magnet between be provided with the gap; Fixedly install interior magnetic conductive board at said inner magnet end face, fixedly install annular magnetic conductive board at the end face of said toroidal magnet, said annular magnetic conductive board and said in be provided with the gap between the magnetic conductive board; One be bonded in the oscillating plate downside voice coil loudspeaker voice coil be arranged in the said gap to extending below;

And the end face of said annular magnetic conductive board is provided with a packing ring, and is fixedly connected the edge of said vibration-transmitting plate.

2. bone-conduction speaker driver according to claim 1 is characterized in that, said panel central authorities are provided with a through hole, are used to derive the lead of said voice coil loudspeaker voice coil.

3. bone-conduction speaker driver according to claim 1 is characterized in that said panel is set to planar structure or arc structure.

4. bone-conduction speaker driver according to claim 1 is characterized in that, said oscillating plate is provided with the groove of the said vibration-transmitting plate of engaging.

5. according to the arbitrary described bone-conduction speaker driver of claim 1 to 4, it is characterized in that each building block of said bone-conduction speaker driver passes through glue.

Images