CN112672256B

CN112672256B - Acoustic-electric conversion device and electronic equipment

Info

Publication number: CN112672256B
Application number: CN202011463876.1A
Authority: CN
Inventors: 杨乐; 曹文峰
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-07-15
Anticipated expiration: 2040-12-11
Also published as: CN112672256A

Abstract

The embodiment of the application provides an acoustoelectric conversion device and electronic equipment. The voice coil is arranged around the periphery of the magnet, the vibrating diaphragm is connected with the voice coil, and the magnet, the voice coil and the vibrating diaphragm are used for realizing the interconversion of an electric signal and an acoustic signal; the coil is arranged around the periphery of the magnet and is used for transmitting wireless signals. Based on this, the sound-electricity conversion device of the embodiment of the application can simultaneously realize the sound-electricity conversion function and the wireless signal transmission function; in addition, the coil can utilize the space between the voice coil and the magnet, and the acoustoelectric conversion device does not need to be additionally provided with the space of the coil, so that the space occupied by the coil can be saved, and the acoustoelectric conversion device can be miniaturized.

Description

Acoustic-electric conversion device and electronic equipment

Technical Field

The present disclosure relates to electronic technologies, and in particular, to an acoustic-electric conversion device and an electronic apparatus.

Background

With the development of communication technology, electronic devices such as smart phones have more and more functions, and communication modes of the electronic devices are more diversified. For example, Near Field Communication (NFC) is increasingly available for electronic devices recently.

However, along with the development of electronic technology, electronic devices are increasingly miniaturized and light and thin, and the internal space of the electronic devices is limited, so that how to reasonably design the NFC antenna of the electronic device is limited in the radiation area of the NFC antenna is a difficult problem which needs to be solved at present.

Disclosure of Invention

The embodiment of the application provides an acoustoelectric conversion device and electronic equipment, which can realize the miniaturization of the acoustoelectric conversion device and the electronic equipment.

In a first aspect, an embodiment of the present application provides an acoustic-electric conversion apparatus, including:

a magnet;

a voice coil disposed around a periphery of the magnet;

the magnet, the voice coil and the vibrating diaphragm are used for realizing the interconversion of an electric signal and an acoustic signal; and

a coil disposed around a periphery of the magnet, the coil for transmitting a wireless signal.

In a second aspect, an embodiment of the present application provides an electronic device, including:

an acoustoelectric conversion device including the acoustoelectric conversion device as described above; and

near field communication circuitry electrically connected with the coil to energize the coil to transmit near field communication signals.

According to the acoustoelectric conversion device and the electronic equipment, the acoustoelectric conversion device comprises the magnet, the voice coil, the vibrating diaphragm and the coil, the vibrating diaphragm is connected with the voice coil, the vibrating diaphragm and the magnet can achieve interconversion of an electric signal and an acoustic signal, and the coil can transmit a wireless signal, so that the acoustoelectric conversion device can achieve an acoustoelectric conversion function and a wireless signal transmission function at the same time. And the coil can surround the periphery of the magnet together with the voice coil, the coil can utilize the space between the voice coil and the magnet, the space of the coil is not additionally arranged in the acoustoelectric conversion device, the space occupied by the coil can be saved, and the acoustoelectric conversion device can be miniaturized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of an acoustic-electric conversion apparatus according to an embodiment of the present application.

Fig. 2 is a schematic view of a first connection of the voice coil, the coil and the magnet shown in fig. 1.

FIG. 3 is a schematic diagram of a current flow of the voice coil and the coil shown in FIG. 2.

Fig. 4 is a second connection diagram of the voice coil, the coil and the magnet shown in fig. 1.

Fig. 5 is an electrical connection diagram of an acoustic-electric conversion apparatus according to an embodiment of the present application.

Fig. 6 is a schematic top view of the acoustic-electric conversion device shown in fig. 1.

Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to fig. 1 to 7 in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the application provides an acoustic-electric conversion device and electronic equipment, wherein the acoustic-electric conversion device can realize the functions of emitting sound signals and collecting the sound signals of the electronic equipment, for example, the acoustic-electric conversion device can be a loudspeaker and a microphone of the electronic equipment, and can also be a microphone and a receiver of the electronic equipment; the sound-to-electricity conversion device may also implement a Wireless communication function of the electronic device, for example, the sound-to-electricity conversion device may transmit a Wireless Fidelity (Wi-Fi) signal, a Global Positioning System (GPS) signal, a fourth Generation mobile communication technology (3th-Generation 3G), a third Generation mobile communication technology (4th-Generation 4G), a fifth Generation mobile communication technology (5th-Generation 5G), a Near Field Communication (NFC) signal, a bluetooth signal, and the like.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an acoustic-electric conversion apparatus provided in an embodiment of the present application. The acoustic-electric conversion apparatus 100 includes a housing 110, a frame 120, a diaphragm 130, a voice coil 140, a coil 150, and a magnet 160.

Wherein the housing 110 and the frame 120 are connected to each other. The housing 110 and the frame 120 are secured together, for example, by welding, screws, adhesive, or the like. The housing 110 may include an upper cover 111 and a lower cover 112, the upper cover 111 is located at one side of the frame 120, the lower cover 112 is located at the other side of the frame 120, a through hole 121 (or a groove extending in the thickness direction of the frame 120) is formed in the middle of the frame 120, the upper cover 111, the frame 120 and the lower cover 112 may jointly form an accommodation space, and the diaphragm 130, the voice coil 140, the coil 150 and the magnet 160 may be located in the accommodation space.

Wherein the magnet 160 may be located at a central position of the accommodating space, and the magnet 160 may be a permanent magnet 160. The voice coil 140 may be wound around the circumference of the magnet 160 such that the voice coil 140 may be disposed around the circumference of the magnet 160. The diaphragm 130 may be disposed on one side of the voice coil 140, and the diaphragm 130 may be connected to the voice coil 140, and the diaphragm 130 may vibrate under the driving of the voice coil 140 to implement interconversion between the sound signal and the electrical signal.

For example, when the voice coil 140 is electrically connected to the audio circuit of the electronic device 10, the audio circuit may transmit an alternating first current signal to the voice coil 140, and the voice coil 140 may generate a first magnetic field under the action of the first current signal, so that the direction of the first magnetic field is also continuously changed since the first current signal is an alternating current. However, since the magnet 160 is a permanent magnet, the direction of the second magnetic field generated by the magnet 160 is fixed, and the first magnetic field and the second magnetic field are constantly changed in direction, so that the voice coil 140 and the magnet 160 attract each other for a period of time, and the voice coil 140 and the magnet 160 repel each other for a period of time, thereby the distance between the voice coil 140 and the magnet 160 is changed, and the voice coil 140 can move relative to the magnet 160. Because the diaphragm 130 is connected with the voice coil 140, the diaphragm 130 can also move relative to the magnet 160 to generate vibration, and the diaphragm 130 which continuously vibrates can push air to vibrate, so that the conversion of an electric signal and a sound signal can be realized under the mutual matching of the voice coil 140, the magnet 160 and the diaphragm 130.

For another example, when the diaphragm 130 receives an external sound signal, the diaphragm 130 vibrates and drives the voice coil 140 to vibrate, the relative position between the voice coil 140 and the magnet 160 changes, so that the magnetic field passing through the voice coil 140 changes, the changed magnetic field generates an induced electromotive force in the voice coil 140, and a second current signal is generated. Further, the voice coil 140, the magnet 160 and the diaphragm 130 cooperate with each other to convert the sound signal into the electric signal.

Wherein the coil 150 and the voice coil 140 may be two separate structures. The coil 150 may be wound around the circumference of the magnet 160, with the coil 150 being disposed around the circumference of the magnet 160. The coil 150 may be a conductor structure, and when the excitation signal is transmitted to the coil 150, the coil 150 may transmit a wireless signal under the action of the excitation signal.

It is understood that the coil 150 may be a near field communication coil, and the acoustic-electric conversion apparatus 100 may transmit a near field communication signal through the coil 150. Of course, the coil 150 may also transmit other wireless signals such as 3G, 4G, 5G, Wi-Fi, GPS, Bluetooth, etc.

It is understood that when the coil 150 transmits the near field communication signal or other wireless signals, the magnet 160 may be a permanent magnet with a resistivity much higher than that of metal or alloy magnetic material and a high dielectric property, and the ferrite magnet 160 may improve the radiation performance of the coil 150.

In the acoustic-electric conversion apparatus 100 according to the embodiment of the present application, the voice coil 140, the diaphragm 130, and the magnet 160 may implement interconversion between an electric signal and an acoustic signal, and the coil 150 may transmit a wireless signal, so that the acoustic-electric conversion apparatus 100 may implement both an acoustic-electric conversion function and a wireless signal transmission function. Moreover, the coil 150 may surround the periphery of the magnet 160 together with the voice coil 140, the coil 150 may utilize the space between the voice coil 140 and the magnet 160, the space occupied by the coil 150 may be saved without additionally providing the space for the coil 150 in the acoustic-electric conversion device 100, and the acoustic-electric conversion device 100 may be miniaturized.

Referring to fig. 2 in conjunction with fig. 1, fig. 2 is a first connection diagram of the voice coil, the coil and the magnet shown in fig. 1. In order to avoid interference between the voice coil 140 and the coil 150 when the voice coil 140 and the coil 150 are operated simultaneously, the voice coil 140 may surround one end of the magnet 160, for example, the holder 162 of the magnet 160, the coil 150 may surround the other end of the magnet 160, for example, the holder 162 of the magnet 160, and the voice coil 140 may be spaced apart from the coil 150.

For example, the magnet 160, for example, the support 162 of the magnet 160, may include an upper portion and a lower portion, the voice coil 140 may be wound on the support 162 around the upper portion of the support 162, and the coil 150 may be wound on the support 162 around the lower portion of the support 162, in this case, there is no overlapping or crossing portion between the voice coil 140 and the coil 150, the distance between the voice coil 140 and the coil 150 is relatively long, and the mutual interference between the voice coil 140 and the coil 150 is relatively small, so that the normal operation of the sound-electricity conversion function and the wireless signal transmission function can be ensured.

In order to further reduce the interference between the voice coil 140 and the coil 150, please refer to fig. 3 in combination with fig. 2, and fig. 3 is a schematic current diagram of the voice coil and the coil shown in fig. 2. When the voice coil 140 and the coil 150 are spaced apart, the voice coil 140 may include a first portion 141 adjacent to the coil 150, and the coil 150 may include a second portion 151 adjacent to the voice coil 140. The direction of current flowing through the first portion 141 may be opposite to the direction of current flowing through the second portion 151.

It is understood that the first portion 141 may be a portion of the voice coil 140 closer to the coil 150, and the second portion 151 may be a portion of the coil 150 closer to the voice coil 140. When coil 150 and voice coil 140 are disposed around magnet 160, and the distance between first portion 141 and second portion 151 is short, first portion 141 and second portion 151 are susceptible to each other, the magnetic fields between first portion 141 and second portion 151 may be cancelled by adjusting the current flow direction of first portion 141 and second portion 151, so as to reduce mutual interference between the two.

For example, as shown in fig. 3, when the current flowing through the first portion 141 of the voice coil 140 flows from right to left, the first portion 141 of the voice coil 140 may generate first magnetic lines of force from the outside to the inside; when the current flowing through the second portion 151 of the coil 150 flows from left to right, the second portion 151 of the coil 150 may generate a second magnetic flux from the inside to the outside. At this time, the direction of the current flowing through the first portion 141 is opposite to the direction of the current flowing through the second portion 151, and the directions of the first magnetic lines and the second magnetic lines are also opposite to each other, so that the magnetic fields generated by the first magnetic lines and the second magnetic lines cancel each other out, thereby reducing the interference of the voice coil 140 to the coil 150 and the interference of the coil 150 to the voice coil 140.

In the acoustic-electric conversion device 100 according to the embodiment of the present application, the direction of the current flowing through the first portion 141 of the voice coil 140 adjacent to the coil 150 is opposite to the direction of the current flowing through the second portion 151 of the coil 150 adjacent to the voice coil 140, so that the magnetic field generated by the first portion 141 and the magnetic field generated by the second portion 151 can cancel each other out, thereby reducing the mutual interference between the voice coil 140 and the coil 150.

Referring to fig. 4 in conjunction with fig. 2, fig. 4 is a second connection diagram of the voice coil, the coil and the magnet shown in fig. 1. At least a portion of the voice coil 140 and at least a portion of the coil 150 may also be wound around the periphery of the magnet 160, such as a carrier 162 for the magnet 160, in parallel.

Illustratively, as shown in FIG. 4, all of the voice coils 140 and all of the coils 150 are wound in parallel around the periphery of a magnet 160, such as a carrier 162 for the magnet 160. In this case, the voice coil 140 and the coil 150 may form a twisted pair, and the voice coil 140 and the coil 150 may be two wires having an insulating protective layer twisted with each other at a certain density. The conductive lines of the voice coil 140 and the conductive lines of the coil 150 are alternately arranged in this order when viewed from the side of the magnet 160.

It is understood that when the voice coil 140 and the coil 150 form a twisted pair, the entire voice coil 140 is adjacent to the coil 150, and the first portion 141 may be the entire voice coil 140; similarly, the whole coil 150 may be adjacent to the voice coil 140, and the second portion 151 may be the whole coil 150, in which case, the current flowing through the whole coil 140 may flow in the opposite direction to the current flowing through the whole coil 150, so that the magnetic fields formed by the voice coil 140 and the coil 150 may cancel each other to reduce the mutual interference between the two.

In the acoustic-electric conversion device 100 according to the embodiment of the present application, the voice coil 140 and the coil 150 may form a twisted pair, and both may be wound around the periphery of the magnet 160 at the same time, so as to facilitate the assembly of the voice coil 140 and the coil 150. Meanwhile, when the current flowing into the coil and the current flowing into the coil are in opposite directions, the mutual interference between the two currents can be reduced, and the normal operation of the sound-electricity conversion function of the voice coil 140 and the performance of the coil 150 for transmitting wireless signals can be ensured.

Note that, the above is a scheme in which the entire coil 150 and the entire voice coil 140 are wound around the periphery of the magnet 160 in parallel. In practical use, a scheme in which the partial coil 150 and the entire voice coil 140 are parallel to the circumference of the magnet 160, a scheme in which the partial coil 150 and the partial voice coil 140 are parallel to the circumference of the magnet 160, and a scheme in which the entire coil 150 and the partial voice coil 140 are parallel to the circumference of the magnet 160 may be further included. In these schemes, the portions of the coil 150 parallel to the voice coil 140 may be the first portion 141 of the voice coil 140 and the second portion 151 of the coil 150, which are not described in detail herein.

Referring to fig. 2 and 4 again in conjunction with fig. 1, the magnet 160 may further include a core 161 and a holder 162, the core 161 may be a permanent magnet, the holder 162 may be a metal conductor, the holder 162 may be disposed around a periphery of the core 161, and the holder 162 may be attached to the core 161, and the holder 162 may carry the voice coil 140 and the coil 150.

The holder 162 may have a recess 163, and the recess 163 may be disposed around the periphery of the magnetic core 161, that is, the recess 163 may also be an annular recess, the bottom wall of the recess 163 may be attached to the periphery of the magnetic core 161, and the voice coil 140 and the coil 150 may be located in the recess 163.

It is understood that the support 162 may be a winding axis of the coil 150 and the voice coil 140, and both the coil 150 and the voice coil 140 may be wound on the support 162.

It is understood that the voice coil 140 and the coil 150 may be located at both ends of the recess 163 as shown in fig. 2, for example, the voice coil 140 is located at the upper portion of the recess 163 and the coil 150 is located at the lower portion of the recess 163. It is understood that the voice coil 140 and the coil 150 may be located in parallel in the whole recess 163 as shown in fig. 4, and will not be described herein.

It is understood that the length of the recess 163 may be determined according to the number of winding turns of the voice coil 140 and the coil 150. When the number of turns of the voice coil 140 and the coil 150 is large, the length of the recess 163 may be long, so that the length of the recess 163 may be adapted to the number of turns of the voice coil 140 and the coil 150.

It is understood that the width of the recess 163 may be determined according to the wire diameters of the voice coil 140 and the coil 150. When the wire diameters of the voice coil 140 and the coil 150 are large, the width of the recess 163 may be wide, so that the width of the recess 163 may be adapted to the wire diameters of the voice coil 140 and the coil 150.

It is understood that when the coil 150 transmits the near field communication signal, the coil 150 needs to bear a larger current, and the wire diameter of the coil 150 may be larger to accommodate the larger current.

In the acoustic-electric conversion device 100 according to the embodiment of the present application, the coil 150 and the coil 140 are disposed on the recess 163 of the holder 162, and the voice coil 140 and the coil 150 can be arbitrarily expanded in the length direction and the thickness direction of the recess 163, on one hand, the coil 150 and the voice coil 140 do not protrude out of the holder 162, and the space occupied by the coil 150 and the voice coil 140 can be saved; on the other hand, the voice coil 140 and the coil 150 may be expanded to a suitable length and diameter to realize an acoustoelectric conversion function and a wireless signal transmission function.

The voice coil 140 may transmit an electrical signal of a first frequency, and the voice coil 140, the diaphragm 130 and the magnet 160 may perform interconversion between the electrical signal and the acoustic signal under the action of the electrical signal of the first frequency. It is understood that the range of the first frequency may include 20Hz to 20000Hz, so that the acoustic-electric conversion apparatus 100 of the embodiment of the present application may be a microphone apparatus or a speaker apparatus.

Wherein the coil 150 can transmit an electrical signal of a second frequency, and the coil 150 can transmit a wireless signal under the action of the electrical signal of the second frequency. It will be appreciated that the second frequency may be different from the first frequency. Illustratively, the second frequency range may include 13.56MHz, so that the acoustic-electric conversion device 100 of the embodiment of the present application may also be an NFC antenna device, and the coil 150 may be an NFC antenna radiator.

In order to further reduce the mutual interference between the coil 150 and the voice coil 140, please refer to fig. 5, and fig. 5 is an electrical connection schematic diagram of the acoustic-electric conversion apparatus according to the embodiment of the present application. The sound-electricity conversion device 100 of the embodiment of the application may further include an audio circuit 170, a near field communication circuit 180, a processor 190, a first filter circuit LC1, and a second filter circuit LC 2.

Audio circuitry 170 may be in direct or indirect electrical communication with voice coil 140, and audio circuitry 170 may provide a first current signal to voice coil 140 to cause voice coil 140, diaphragm 130, and magnet 160 to generate an acoustic signal; the audio current may also receive a second current signal generated by the voice coil 140 under vibration of an external sound signal, so that the voice coil 140, the diaphragm 130 and the magnet 160 may collect the sound signal.

For example, the positive terminal of the audio circuit 170 may be electrically connected to one end of the voice coil 140, the negative terminal of the audio circuit 170 may be electrically connected to the other end of the voice coil 140, and the audio circuit 170 and the voice coil 140 may form a current loop.

The near field communication circuit 180 may be directly or indirectly electrically connected to the coil 150, and the near field communication circuit 180 may increase an excitation current to the coil 150 to excite the coil 150 to radiate a near field communication signal; the coil 150 may also receive near field communication signals of other electronic devices and transmit to the near field communication circuit 180.

For example, the positive pole of the near field communication circuit 180 may be electrically connected to one end of the coil 150, the negative pole of the near field communication circuit 180 may be electrically connected to the other end of the coil 150, and the near field communication circuit 180 and the coil 150 may form a current loop.

First filter circuit LC1 may be electrically connected to coil 150. For example, one end of the first filter circuit LC1 may be coupled between the near field communication circuit 180 and the coil 150, and the other end of the first filter circuit LC1 may be grounded. When the coil 150 and the voice coil 140 operate simultaneously, a first induced current in the same frequency band as the electrical signal transmitted by the voice coil 140 may be induced in the coil 150, and at this time, the first filter circuit LC1 may prevent the electrical signal in the first frequency band from passing through, so as to filter the first induced current generated in the coil 150, and avoid adverse interference of the first induced current on the coil 150.

The second filter circuit LC2 may be electrically connected to the voice coil 140. For example, one end of the second filter circuit LC2 may be coupled between the voice coil 140 and the audio circuit 170, and the other end of the second filter circuit LC2 may be grounded. When the coil 150 and the voice coil 140 work simultaneously, a second induced current in the same frequency band as the electrical signal transmitted by the coil 150 may also be induced on the voice coil 140, and at this time, the second filter circuit LC2 may prevent the electrical signal in the second frequency band from passing through, so as to filter the second induced current generated on the voice coil 140, and avoid adverse interference of the second induced current on the voice coil 140.

It is understood that the first filter circuit LC1 and the second filter circuit LC2 may include a circuit formed by any series connection or any parallel connection of a capacitor, an inductor and a resistor, and will not be described in detail herein.

In the acoustic-electric conversion device 100 according to the embodiment of the application, the first filter circuit LC1 may prevent the electric signal of the first frequency band from passing through, and the first filter circuit LC1 may filter a first induced current generated on the coil 150; the second filter circuit LC2 may block the electric signal of the second frequency band from passing through, and the second filter circuit LC2 may filter a second induced current generated at the voice coil 140. Accordingly, the first and second filter circuits LC1 and LC2 may further reduce mutual interference of the coil 150 and the voice coil 140.

With continuing reference to fig. 5, the acoustic-electric conversion apparatus 100 may further include a tuning circuit M1, and the tuning circuit M1 may be connected in series between the near field communication circuit 180 and the coil 150. The tuning circuit M1 may be configured to match the impedance of the excitation current provided by the near field communication circuit 180 to ensure that the coil 150 may resonate in a predetermined frequency band. For example, the tuning circuit M1 can ensure that the coil 150 can resonate at 13.56MHz excitation signal.

It is understood that the tuning circuit M1 may also include a circuit composed of any series or any parallel connection of a capacitor, an inductor, and a resistor, which will not be described in detail herein.

In order to further increase the mutual interference between the coil 150 and the voice coil 140, the acoustic-electric conversion apparatus 100 according to the embodiment of the present application may dispose the near field communication circuit 180, the second filter circuit LC2, the audio circuit 170, and the first filter circuit LC1 on different sides of the magnet 160. For example, please refer to fig. 6 in combination with fig. 1, and fig. 6 is a schematic top view of the acoustic-electric conversion apparatus shown in fig. 1. The acousto-electric conversion device 100 may also include a first electrical terminal 142, a second electrical terminal 143, a third electrical terminal 152 and a fourth electrical terminal 153.

The first electrical terminals 142 may be connected to a first end of the voice coil 140, the second electrical terminals 143 may be connected to a second end of the voice coil 140, and the first and second

electrical terminals

142 and 143 may be electrically connected to the audio circuit 170. The first electrical terminal 142, the voice coil 140 and the second electrical terminal 143 may be sequentially connected, an end of the first electrical terminal 142 away from the voice coil 140 may be electrically connected to an anode of the audio circuit 170, and an end of the second electrical terminal 143 away from the voice coil 140 may be electrically connected to a cathode of the audio circuit 170, so that the audio circuit 170, the first electrical terminal 142, the voice coil 140 and the second electrical terminal 143 may form a current loop.

The third electrical terminal 152 may be connected with the first terminal of the coil 150, the fourth electrical terminal 153 may be connected with the second terminal of the coil 150, and the third and fourth

electrical terminals

152 and 153 may be electrically connected with the near field communication circuit 180. The third electric connecting terminal 152, the coil 150 and the fourth electric connecting terminal 153 can be connected in sequence, one end of the third electric connecting terminal 152, which is far away from the coil 150, can be electrically connected with the positive pole of the near field communication circuit 180, and one end of the fourth electric connecting terminal 153, which is far away from the coil 150, can be electrically connected with the negative pole of the near field communication circuit 180, so that the near field communication circuit 180, the third electric connecting terminal 152, the coil 150 and the fourth electric connecting terminal 153 can also form a current loop.

Wherein the first and second

electrical terminals

142 and 143 may be located at a first side of the magnet 160, and the third and fourth

electrical terminals

152 and 153 may be located at a second side of the magnet 160 disposed opposite to the first side, so that the first and second

electrical terminals

142 and 143 and the third and fourth

electrical terminals

152 and 153 may be located at both sides of the magnet 160, respectively, with a greater distance between the first and second

electrical terminals

142 and 143 and the third and fourth

electrical terminals

152 and 153.

When the first and second

electric terminals

142 and 143 are electrically connected to the audio circuit 170 and the third and fourth

electric terminals

152 and 153 are electrically connected to the near field communication circuit 180, the distance between the audio circuit 170 and the near field communication circuit 180 may be relatively long, so that mutual interference between the audio circuit 170 and the near field communication circuit 180 during operation may be reduced.

It is understood that the coil 150 may be electrically connected to other radio frequency circuits, Wi-Fi circuits, GPS circuits, bluetooth circuits, etc. besides the near field communication circuit 180, so that the coil 150 may also transmit wireless signals such as 3G signals, 4G signals, 5G signals, Wi-Fi signals, GPS signals, bluetooth signals, etc. The connection between the circuit and the coil 150 may refer to the connection between the nfc circuit 180 and the coil 150, which is not described herein again.

Based on the structure of the antenna device, the embodiment of the application further provides an electronic device. The electronic device may be a smart phone, a tablet computer, or the like, and may also be a game device, an Augmented Reality (AR) device, an automobile device, a data storage device, an audio playing device, a video playing device, a notebook computer, a desktop computing device, or the like. Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 10 may include a display 200, a middle frame 300, a circuit board 400, a battery 500, and a rear case 600 in addition to the acoustic-electric conversion apparatus 100.

The display screen 200 is disposed on the middle frame 300 to form a display surface of the electronic device 10, and is used for displaying information such as images and texts. The Display screen 200 may include a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen 200.

It is understood that the display screen 200 may be a full-screen, in which case the entire area of the display screen 200 is the display area and does not include the non-display area, or the non-display area on the display screen 200 occupies only a small area for the user, so that the display screen 200 has a large screen area. Alternatively, the display 200 may be a non-full screen, in which case the display 200 includes a display area and a non-display area adjacent to the display area. The display area is used for displaying information, and the non-display area does not display information.

It is understood that a cover plate (not shown) may be further disposed on the display 200 to protect the display 200 and prevent the display 200 from being scratched or damaged by water. The cover plate may be a transparent glass cover plate, so that a user can observe contents displayed by the display screen 200 through the cover plate. It will be appreciated that the cover plate may be a glass cover plate of sapphire material.

The middle frame 300 may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The middle frame 300 is used for providing a supporting function for the electronic devices or functional components in the electronic device 10 so as to mount the electronic devices or functional components of the electronic device 10 together. For example, the middle frame 300 may be provided with a groove, a protrusion, a through hole, etc. to facilitate mounting of the electronic device or the functional component of the electronic apparatus 10. It is understood that the acoustic electric conversion apparatus 100 may be mounted on the middle frame 300.

It is understood that the middle frame 300 may further be provided with a sound outlet hole (not shown), so that the acoustoelectric conversion device 100 can collect an external sound signal or transmit a sound signal through the sound outlet hole.

The circuit board 400 is disposed on the middle frame 300 to be fixed, and the circuit board 400 is sealed inside the electronic device 10 by the rear case 600. The circuit board 400 may be a motherboard of the electronic device 10. The circuit board 400 may have the processor 190 integrated thereon, and may further have one or more of a headset interface, an acceleration sensor, a gyroscope, a motor, and other functional components integrated thereon. Meanwhile, the display screen 200 may be electrically connected to the circuit board 400 to control the display of the display screen 200 by the processor 190 on the circuit board 400.

It is understood that one or more of the audio circuit 170, the near field communication circuit 180, the first filter circuit LC1, the second filter circuit LC2, and the tuning circuit M1 of the acoustic-electric conversion apparatus 100 may be provided on the circuit board 400. Of course, the above components may be provided on a small board of the electronic device 10, and are not limited herein.

The battery 500 is disposed on the middle frame 300, and the battery 500 is sealed inside the electronic device 10 by the rear case 600. Meanwhile, the battery 500 is electrically connected to the circuit board 400 to enable the battery 500 to power the electronic device 10. The circuit board 400 may be provided thereon with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 500 to the various electronic devices in the electronic device 10.

The rear case 600 is coupled to the middle frame 300. For example, the rear case 600 may be attached to the middle frame 300 by an adhesive such as a double-sided tape to achieve connection with the middle frame 300. Among other things, the rear case 600 is used to seal the electronic devices and functional components of the electronic device 1010 inside the electronic device 10 together with the middle frame 300 and the display screen 200 to protect the electronic devices and functional components of the electronic device 10.

It is understood that the electronic device 10 may include components such as a camera module, a sensor assembly, etc., in addition to the components described above, and will not be described in detail herein.

It is to be understood that in the description of the present application, terms such as "first", "second", and the like are used solely for distinguishing between similar objects and are not to be construed as indicating or implying relative importance or implicitly indicating a number of indicated technical features.

The sound-electricity conversion device and the electronic device provided in the embodiments of the present application are described in detail above. The principles and embodiments of the present application are described herein using specific examples, which are presented only to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An acoustoelectric conversion device, comprising:

the magnetic body is ferrite and comprises a magnetic core and a bracket, the bracket is arranged around the periphery of the magnetic core, and a groove is formed in the bracket;

the voice coil is arranged around the periphery of the support and is positioned in the groove;

the vibrating diaphragm is connected with the voice coil;

the audio circuit is electrically connected with the voice coil and is used for enabling the voice coil, the vibrating diaphragm and the magnet to realize mutual conversion of electric signals and acoustic signals;

the coil is positioned in the groove, the coil and the voice coil are wound on the periphery of the support in parallel, the coil and the voice coil form a twisted pair, the direction of current flowing through the coil is opposite to that of current flowing through the voice coil, and the coil is a near field communication coil;

near field communication circuitry disposed on a different side of the magnet than the audio circuitry, the near field communication circuitry being electrically connected to the coil and configured to energize the coil to radiate near field communication signals;

the first filter circuit is coupled between the near field communication circuit and the coil at one end, and grounded at the other end, and is used for filtering first induced current which is induced on the coil and has the same frequency band as an electric signal transmitted by the voice coil; and

and one end of the second filter circuit is coupled between the voice coil and the audio circuit, and the other end of the second filter circuit is grounded, and the second filter circuit is used for filtering a second induced current which is induced on the voice coil and has the same frequency band as an electric signal transmitted by the coil.

2. The acoustic-electric conversion device of claim 1, wherein the voice coil is configured to transmit electrical signals at a first frequency and the coil is configured to transmit electrical signals at a second frequency, the first frequency being different from the second frequency.

3. The acousto-electric conversion device according to claim 2, characterised in that the range of the first frequency comprises 20Hz to 20000Hz and the range of the second frequency comprises 13.56 MHz.

4. The acoustic-electric conversion apparatus according to claim 1, characterized by further comprising:

the first electric connection end is connected with the first end of the voice coil;

the first electric connection end and the second electric connection end are electrically connected with the audio circuit;

the third electric connection end is connected with the first end of the coil; and

the fourth electric connection end is connected with the second end of the coil, and the third electric connection end and the fourth electric connection end are electrically connected with the near field communication circuit; wherein,

the first electric connection end and the second electric connection end are located on the first side of the magnet, and the third electric connection end and the fourth electric connection end are located on the second side, opposite to the first side, of the magnet.

5. An electronic device, comprising an acoustoelectric conversion device, wherein the acoustoelectric conversion device is the acoustoelectric conversion device recited in any one of claims 1 to 4.