Sensitivity-adjustable bone conduction speaker

Abstract

The application provides a bone conduction loudspeaker with adjustable sensitivity, which comprises a panel installed on the upper part of a transmission plate, used for transmitting mechanical waves to the muscle tissue of a hearing-impaired patient; the transmission plate is installed on the upper part of a vibrating plate, used for transmitting the mechanical waves generated by the vibrating plate to the panel; the vibrating plate is installed on the upper part of a voice coil, used for transmitting the mechanical waves generated by the voice coil to the transmission plate; a voice coil slot plate is installed on the lower part of the voice coil, used for inserting the coil; a coil group is inserted into the voice coil slot plate, used for generating ampere force after being electrified and adjusting the sensitivity of the voice coil vibration; external wires are used for providing current for the coil group; a gasket is installed between the transmission plate and a first magnet guide, used for connecting the vibration system and the magnetic system; a plurality of magnet guides and magnets are connected with each other and are used for forming a magnetic field. The application improves the use flexibility of the bone conduction loudspeaker.

Description

Technical Field

[0001] This invention relates to the field of bone conduction hearing aid technology, and more particularly to a bone conduction loudspeaker with adjustable sensitivity. Background Technology

[0002] Bone conduction loudspeakers convert electrical signals into mechanical vibration signals, which are then transmitted through human tissue and bone to the cochlea, enabling hearing-impaired patients to hear sound. Increasing the sensitivity of bone conduction loudspeakers allows for more efficient conversion of electrical energy into mechanical energy, resulting in greater mechanical power output. Current technologies primarily increase the number of magnetic and conductive elements in the bone conduction loudspeaker to enhance the magnetic field strength, thereby improving sensitivity. However, while this method improves sensitivity, the increased weight of the magnetic and conductive elements inevitably leads to a heavier loudspeaker. Furthermore, once the number of magnetic and conductive elements is increased, the sensitivity of the bone conduction loudspeaker tends to be fixed, making adjustments extremely difficult. Therefore, developing a bone conduction loudspeaker with adjustable sensitivity to effectively overcome the shortcomings of the aforementioned technologies has become a pressing technical problem for the industry. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, embodiments of the present invention provide a bone conduction loudspeaker with adjustable sensitivity.

[0004] In a first aspect, embodiments of the present invention provide a sensitivity-adjustable bone conduction loudspeaker, comprising: a panel mounted on the upper part of a vibrating plate for transmitting mechanical waves to the body tissue of a hearing-impaired patient; a vibrating plate mounted on the upper part of a vibrating plate for transmitting mechanical waves generated by the vibrating plate to the panel; a vibrating plate mounted on the upper part of a voice coil for transmitting mechanical waves generated by the voice coil to the vibrating plate; a voice coil slot plate mounted on the lower part of the voice coil for inserting a coil; a coil assembly inserted in the voice coil slot plate for generating an Ampere force after being energized and adjusting the sensitivity of the voice coil vibration; an external conductor for providing current to the coil assembly; a washer mounted between the vibrating plate and a first magnetic conductor for connecting the vibration system and the magnetic system; a first magnetic conductor mounted on the upper part of a first magnet for forming a magnetic field; a second magnetic conductor mounted on the upper part of a second magnet for forming a magnetic field; a first magnet connected to the second magnet for forming a magnetic field; and a second magnet connected at the upper part to the second magnetic conductor and at the lower part to the first magnet for forming a magnetic field.

[0005] Based on the above-described device embodiments, the bone conduction loudspeaker with adjustable sensitivity provided in this embodiment of the invention includes a voice coil slot plate comprising: a plurality of coil slots on the lower surface of the voice coil slot plate for inserting coils; and a plurality of pin holes disposed on the plurality of coil slots for inserting pins of coils.

[0006] On the basis of the above-mentioned device embodiment, the bone conduction speaker with adjustable sensitivity provided in the embodiment of the present application, the coil group comprises: a first metal coil carrier for winding a metal coil; a first plug arranged on the upper part of the first metal coil carrier for plugging into one of the plug holes; a second plug arranged on the upper part of the first metal coil carrier for plugging into one of the plug holes; a third plug arranged on the upper part of the first metal coil carrier for plugging into one of the plug holes; a fourth plug arranged on the upper part of the first metal coil carrier for plugging into one of the plug holes; a first metal coil wound on the first metal coil carrier for generating an ampere force after passing through an electric current; and a first wire connected with the first metal coil for inputting and outputting an electric current to the first metal coil.

[0007] On the basis of the above-mentioned device embodiment, the bone conduction speaker with adjustable sensitivity provided in the embodiment of the present application, the coil group further comprises: a second metal coil carrier for winding a metal coil; a fifth plug arranged on the upper part of the second metal coil carrier for plugging into one of the plug holes; a sixth plug arranged on the upper part of the second metal coil carrier for plugging into one of the plug holes; a seventh plug arranged on the upper part of the second metal coil carrier for plugging into one of the plug holes; an eighth plug arranged on the upper part of the second metal coil carrier for plugging into one of the plug holes; a second metal coil wound on the second metal coil carrier for generating an ampere force after passing through an electric current; and a second wire connected with the second metal coil for inputting and outputting an electric current to the second metal coil.

[0008] On the basis of the above-mentioned device embodiment, the bone conduction speaker with adjustable sensitivity provided in the embodiment of the present application, the coil group further comprises: a third metal coil carrier for winding a metal coil; a ninth plug arranged on the upper part of the third metal coil carrier for plugging into one of the plug holes; a tenth plug arranged on the upper part of the third metal coil carrier for plugging into one of the plug holes; an eleventh plug arranged on the upper part of the third metal coil carrier for plugging into one of the plug holes; a twelfth plug arranged on the upper part of the third metal coil carrier for plugging into one of the plug holes; a third metal coil wound on the third metal coil carrier for generating an ampere force after passing through an electric current; and a third wire connected with the third metal coil for inputting and outputting an electric current to the third metal coil.

[0009] On the basis of the above-mentioned device embodiment, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application is characterized in that the first metal coil is wound on the first metal coil carrier in a direction perpendicular to the plane of the first metal coil carrier; the second metal coil is wound on the second metal coil carrier in a direction perpendicular to the plane of the second metal coil carrier; and the third metal coil is wound on the third metal coil carrier in a direction forming a first preset angle with the plane of the third metal coil carrier, wherein the first preset angle is greater than zero and less than ninety degrees.

[0010] On the basis of the above-mentioned device embodiment, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application is characterized in that the first metal coil is wound on the first metal coil carrier in a direction forming a second preset angle with the plane of the first metal coil carrier; the second metal coil is wound on the second metal coil carrier in a direction forming a third preset angle with the plane of the second metal coil carrier; and the third metal coil is wound on the third metal coil carrier in a direction perpendicular to the plane of the third metal coil carrier, wherein the second preset angle and the third preset angle are both greater than zero and less than ninety degrees.

[0011] On the basis of the above-mentioned device embodiment, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application is characterized in that the first metal coil carrier, the second metal coil carrier and the third metal coil carrier are used simultaneously.

[0012] On the basis of the above-mentioned device embodiment, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application is characterized in that the first metal coil carrier or the second metal coil carrier is used simultaneously with the third metal coil carrier.

[0013] On the basis of the above-mentioned device embodiment, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application is characterized in that the first metal coil carrier, the second metal coil carrier or the third metal coil carrier is used alone.

[0014] The bone conduction loudspeaker with adjustable sensitivity provided in the embodiment of the present application can ensure the sensitivity of the bone conduction loudspeaker and adjust the sensitivity of the bone conduction loudspeaker at any time by adjusting the number of the metal coil carriers in the coil set in real time, thereby improving the use flexibility of the bone conduction loudspeaker. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present application are within the protection scope of the present application.

[0016] Figure 1 A schematic diagram of a bone conduction loudspeaker structure with adjustable sensitivity provided by the embodiment of the present application is shown in the figure.

[0017] Figure 2 A schematic diagram of a voice coil slot plate and coil set structure provided by the embodiment of the present application is shown in the figure.

[0018] Figure 3 A schematic diagram of a winding effect of a metal coil on a metal coil carrier provided by the embodiment of the present application is shown in the figure.

[0019] Figure 4 A schematic diagram of a winding effect of another metal coil on a metal coil carrier provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0020] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present application are within the protection scope of the present application.

[0021] The embodiment of the present application provides a bone conduction loudspeaker with adjustable sensitivity, as shown in the figure. Figure 1The device comprises a panel 101 installed on the upper part of a transmission plate 102 for transmitting mechanical waves to the body tissue of a hearing-impaired patient; the transmission plate 102 is installed on the upper part of a vibrating plate 103 for transmitting the mechanical waves generated by the vibrating plate 103 to the panel 101; the vibrating plate 103 is installed on the upper part of a voice coil 105 for transmitting the mechanical waves generated by the voice coil 105 to the transmission plate 102; a voice coil slot plate 106 is installed on the lower part of the voice coil 105 for inserting the coil; a coil group 107 is inserted into the voice coil slot plate 106 for generating ampere force after being electrified and adjusting the sensitivity of the voice coil 105 vibration; an external lead 112 is used for providing current for the coil group 107; a washer 104 is installed between the transmission plate 102 and a first magnetic conductor 108 for connecting the vibration system and the magnetic system; the first magnetic conductor 108 is installed on the upper part of a first magnet 109 for forming a magnetic field; a second magnetic conductor 110 is installed on the upper part of a second magnet 111 for forming a magnetic field; the first magnet 109 is connected with the second magnet 111 for forming a magnetic field; the second magnet 111 is connected with the second magnetic conductor 110 on the upper part and connected with the first magnet 111 on the lower part for forming a magnetic field.

[0022] On the basis of the above-mentioned embodiments, the voice coil slot plate of the sensitivity-adjustable bone conduction loudspeaker provided in the embodiments of the present application comprises: a plurality of coil slots opened on the lower surface of the voice coil slot plate for inserting the coil; and a plurality of plug holes arranged on the plurality of coil slots for inserting the plug of the coil.

[0023] Specifically, as shown in Figure 2 Three coil slots are opened on the voice coil slot plate 106, and the coil slot 208 is taken as an example, wherein a first plug hole 209, a second plug hole 210, a third plug hole 211 and a fourth plug hole 212 are opened on the coil slot 208. The first plug 204 can be inserted into the first plug hole 209, the second plug 205 can be inserted into the second plug hole 210, the third plug 206 can be inserted into the third plug hole 211, and the fourth plug 207 can be inserted into the fourth plug hole 212. Through the combination of the plug and the plug hole, the corresponding metal coil carrier can be inserted into the corresponding coil slot.

[0024] As shown in Figure 2On the basis of the above-mentioned embodiments, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiments of the present application, the coil group comprises: a first metal coil carrier 201 for winding a metal coil 202; a first plug 204 arranged on the upper part of the first metal coil carrier 201 and used for plugging into one of the plug holes; a second plug 205 arranged on the upper part of the first metal coil carrier 201 and used for plugging into one of the plug holes; a third plug 206 arranged on the upper part of the first metal coil carrier 201 and used for plugging into one of the plug holes; a fourth plug 207 arranged on the upper part of the first metal coil carrier 201 and used for plugging into one of the plug holes; the first metal coil 202 is wound on the first metal coil carrier 201 and used for generating an ampere force after passing through an electric current; and a first wire 203 connected with the first metal coil 202 and used for inputting and outputting an electric current to the first metal coil 202. It should be noted that the first wire 203 is connected with the external wire 112 in the bone conduction loudspeaker 100, and together forms a loop to facilitate the flow of an electric current to generate an ampere force. Figure 1

[0025] On the basis of the above-mentioned embodiments, the bone conduction loudspeaker with adjustable sensitivity provided in the embodiments of the present application, the coil group, further comprises: a second metal coil carrier for winding a metal coil; a fifth plug arranged on the upper part of the second metal coil carrier and used for plugging into one of the plug holes; a sixth plug arranged on the upper part of the second metal coil carrier and used for plugging into one of the plug holes; a seventh plug arranged on the upper part of the second metal coil carrier and used for plugging into one of the plug holes; an eighth plug arranged on the upper part of the second metal coil carrier and used for plugging into one of the plug holes; a second metal coil wound on the second metal coil carrier and used for generating an ampere force after passing through an electric current; and a second wire connected with the second metal coil and used for inputting and outputting an electric current to the second metal coil. It should be noted that the second metal coil carrier and its attachments are similar to the first metal coil carrier and its attachments in the bone conduction loudspeaker 100, and specific reference can be made to the foregoing description of the first metal coil carrier and its attachments, which will not be described herein again. Figure 2

[0026] ​​On the basis of the above-mentioned embodiments, the sensitivity-adjustable bone conduction speaker provided in the embodiments of the present application, the coil group further comprises: a third metal coil carrier for winding the metal coil; a ninth plug pin arranged on the upper part of the third metal coil carrier and used for plugging into one of the plug pin holes; a tenth plug pin arranged on the upper part of the third metal coil carrier and used for plugging into one of the plug pin holes; an eleventh plug pin arranged on the upper part of the third metal coil carrier and used for plugging into one of the plug pin holes; a twelfth plug pin arranged on the upper part of the third metal coil carrier and used for plugging into one of the plug pin holes; a third metal coil wound on the third metal coil carrier and used for generating Ampere force after current; and a third wire connected with the third metal coil and used for inputting and outputting current to the third metal coil. Figure 2 The third metal coil carrier and its attachments are similar to the first metal coil carrier and its attachments in the above-mentioned embodiments, and specific descriptions can be referred to the foregoing descriptions of the first metal coil carrier and its attachments, which will not be repeated here.

[0027] On the basis of the above-mentioned embodiments, the sensitivity-adjustable bone conduction speaker provided in the embodiments of the present application, the first metal coil is wound on the first metal coil carrier in a direction perpendicular to the plane where the first metal coil carrier is located; the second metal coil is wound on the second metal coil carrier in a direction perpendicular to the plane where the second metal coil carrier is located; and the third metal coil is wound on the third metal coil carrier in a direction forming a first preset angle with the plane where the third metal coil carrier is located; wherein the first preset angle is greater than zero and less than ninety degrees.

[0028] Specifically, as shown in Figure 3 , the first metal coil carrier 201 winds the metal coil 301, and the winding direction of the metal coil 301 is the vertical direction, that is, perpendicular to the plane where the first metal coil carrier 201 is located. The metal coil 301 wound in this way can form the maximum Ampere force after being electrified, becoming the main driving force of the bone conduction speaker, effectively improving the sensitivity of the bone conduction speaker. The first preset angle can be 30 degrees, 45 degrees, 60 degrees or 75 degrees.

[0029] On the basis of the above-mentioned embodiments, the sensitivity-adjustable bone conduction speaker provided in the embodiments of the present application, the first metal coil is wound on the first metal coil carrier in a direction forming a second preset angle with the plane where the first metal coil carrier is located; the second metal coil is wound on the second metal coil carrier in a direction forming a third preset angle with the plane where the second metal coil carrier is located; and the third metal coil is wound on the third metal coil carrier in a direction perpendicular to the plane where the third metal coil carrier is located; wherein the angle value range of the second preset angle and the third preset angle are both greater than zero and less than ninety degrees.

[0030] Specifically refer to Figure 4 , the first metal coil carrier 201 is wound with the metal coil 401, and the winding direction of the metal coil 401 forms an angle with the vertical direction, that is, an angle with the plane where the first metal coil carrier 201 is located. The Ampere force formed by the metal coil 401 wound in this way after being energized is smaller than Figure 3 The Ampere force formed by the metal coil 301 after being energized in the first metal coil carrier 201, so that the sensitivity of the bone conduction speaker can be adjusted by using the metal coil 301 and the metal coil 401 in cooperation. The angles of the second preset angle and the third preset angle can be 30 degrees, 45 degrees, 60 degrees or 75 degrees, respectively.

[0031] It should be noted that, Figure 3 And Figure 4 The two protrusions on the upper part of the first metal coil carrier 201 in the first metal coil carrier 201 are both inserted.

[0032] On the basis of the above embodiment, the sensitivity adjustable bone conduction speaker provided in the embodiment of the present application is used simultaneously with the first metal coil carrier, the second metal coil carrier and the third metal coil carrier.

[0033] On the basis of the above embodiment, the sensitivity adjustable bone conduction speaker provided in the embodiment of the present application is used simultaneously with the first metal coil carrier or the second metal coil carrier and the third metal coil carrier.

[0034] On the basis of the above embodiment, the sensitivity adjustable bone conduction speaker provided in the embodiment of the present application is used simultaneously with the first metal coil carrier, the second metal coil carrier or the third metal coil carrier.

[0035] It should be noted that the three metal coil carriers (including the metal coils thereon) are used in combination, which can also play a role in adjusting the sensitivity of the bone conduction speaker. For example, if the sensitivity needs to be maximized, the metal coils on the three metal coil carriers can all be set to the vertical winding mode, and if the sensitivity needs to be reduced, all or part of the metal coil carriers with metal coils at a preset angle (greater than 0 degrees and less than 90 degrees) with the vertical direction are used. And by fully inserting or partially inserting (at least one needs to be inserted) into the metal coil carrier, the sensitivity of the bone conduction speaker can also be adjusted. Finally, the number of metal coil carriers is not limited to three, as long as it can play a role in adjusting the sensitivity of the bone conduction speaker (and can adjust the weight of the bone conduction speaker), and the number is within the protection scope of the technical scheme of the present application.

[0036] The sensitivity-adjustable bone conduction loudspeaker provided by the application can ensure the sensitivity of the bone conduction loudspeaker while adjusting the sensitivity of the bone conduction loudspeaker at any time by adjusting the number of the metal coil carriers in real time, and the use flexibility of the bone conduction loudspeaker is improved.

[0037] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0038] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to such a process, method, article or apparatus. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of additional identical elements in the process, method, article or apparatus including the elements.

[0039] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A bone conduction speaker with adjustable sensitivity, characterized in that, The application relates to a hearing aid, which comprises a panel installed on the upper part of a transmission plate and used for transmitting mechanical waves to the muscle tissue of a hearing-impaired patient; a transmission plate installed on the upper part of a vibrating plate and used for transmitting the mechanical waves generated by the vibrating plate to the panel; a vibrating plate installed on the upper part of a voice coil and used for transmitting the mechanical waves generated by the voice coil to the transmission plate; a voice coil slot plate installed on the lower part of the voice coil and used for inserting the coil; a coil group inserted into the voice coil slot plate and used for generating ampere force after being electrified and adjusting the sensitivity of the voice coil vibration; external wires used for providing current for the coil group; a gasket installed between the transmission plate and a first magnetic conductor and used for connecting the vibration system and the magnetic system; a first magnetic conductor installed on the upper part of a first magnet and used for forming a magnetic field; a second magnetic conductor installed on the upper part of a second magnet and used for forming a magnetic field; and a first magnet connected with the second magnet and used for forming a magnetic field. ​ ​ ​ ​ The second magnet is connected with the second magnetic conductor at the upper part and connected with the first magnet at the lower part, and is used for forming a magnetic field; the voice coil slot plate comprises: a plurality of coil slots which are opened on the lower surface of the voice coil slot plate and are used for inserting the coil; a plurality of plug holes which are arranged on the plurality of coil slots and are used for inserting the plug of the coil; the coil group comprises: a first metal coil carrier which is used for winding the metal coil; a first plug which is arranged on the upper part of the first metal coil carrier and is used for inserting one of the plurality of plug holes; a second plug which is arranged on the upper part of the first metal coil carrier and is used for inserting one of the plurality of plug holes; a third plug which is arranged on the upper part of the first metal coil carrier and is used for inserting one of the plurality of plug holes; a fourth plug which is arranged on the upper part of the first metal coil carrier and is used for inserting one of the plurality of plug holes; a first metal coil which is wound on the first metal coil carrier and is used for generating the Ampere force after the current; a first wire which is connected with the first metal coil and is used for inputting and outputting the current of the first metal coil; the coil group further comprises: a second metal coil carrier which is used for winding the metal coil; a fifth plug which is arranged on the upper part of the second metal coil carrier and is used for inserting one of the plurality of plug holes; a sixth plug which is arranged on the upper part of the second metal coil carrier and is used for inserting one of the plurality of plug holes; a seventh plug which is arranged on the upper part of the second metal coil carrier and is used for inserting one of the plurality of plug holes; an eighth plug which is arranged on the upper part of the second metal coil carrier and is used for inserting one of the plurality of plug holes; a second metal coil which is wound on the second metal coil carrier and is used for generating the Ampere force after the current; a second wire which is connected with the second metal coil and is used for inputting and outputting the current of the second metal coil; the coil group further comprises: a third metal coil carrier which is used for winding the metal coil; a ninth plug which is arranged on the upper part of the third metal coil carrier and is used for inserting one of the plurality of plug holes; a tenth plug which is arranged on the upper part of the third metal coil carrier and is used for inserting one of the plurality of plug holes; an eleventh plug which is arranged on the upper part of the third metal coil carrier and is used for inserting one of the plurality of plug holes; a twelfth plug which is arranged on the upper part of the third metal coil carrier and is used for inserting one of the plurality of plug holes; a third metal coil which is wound on the third metal coil carrier and is used for generating the Ampere force after the current; and a third wire which is connected with the third metal coil and is used for inputting and outputting the current of the third metal coil.

2. The adjustable sensitivity bone conduction speaker of claim 1, wherein, The winding direction of the first metal coil on the first metal coil carrier is perpendicular to the plane where the first metal coil carrier is located; the winding direction of the second metal coil on the second metal coil carrier is perpendicular to the plane where the second metal coil carrier is located; and the winding direction of the third metal coil on the third metal coil carrier is at a first preset angle with the plane where the third metal coil carrier is located; wherein the first preset angle is greater than zero and less than ninety degrees.

3. The adjustable sensitivity bone conduction speaker of claim 1, wherein, The first metal coil is wound on the first metal coil carrier in a direction that forms a second preset angle with the plane on which the first metal coil carrier lies; the second metal coil is wound on the second metal coil carrier in a direction that forms a third preset angle with the plane on which the second metal coil carrier lies; the third metal coil is wound on the third metal coil carrier in a direction that is perpendicular to the plane on which the third metal coil carrier lies; wherein the angle value range of the second preset angle and the third preset angle is greater than zero and less than ninety degrees.

4. The adjustable sensitivity bone conduction speaker of claim 2 or 3, wherein, The first metal coil carrier, the second metal coil carrier and the third metal coil carrier are used simultaneously.

5. The adjustable sensitivity bone conduction speaker of claim 2 or 3, wherein, The first metal coil carrier or the second metal coil carrier is used simultaneously with the third metal coil carrier.

6. The adjustable sensitivity bone conduction speaker of claim 2 or 3, wherein, The first metal coil carrier, the second metal coil carrier or the third metal coil carrier is used alone.

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