CN111355826A

CN111355826A - Screen vibration sound production device and electronic product

Info

Publication number: CN111355826A
Application number: CN201811574302.4A
Authority: CN
Inventors: 朱跃光; 刘春发; 毛东升; 史德璋
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-06-30
Also published as: WO2020125789A1

Abstract

The invention discloses a screen vibration sound production device and an electronic product. This screen vibration sound generating device includes: the vibrating assembly comprises a screen and a fixed piece, and the screen is configured to vibrate relative to the fixed piece; the driving assembly comprises at least one coil and at least one magnet, the coil is wound by a wire along one direction to form a closed annular structure, a through hole is formed in the middle of the coil, a wiring area of the coil is arranged around the through hole, the coil is fixedly connected with one of the screen or the fixing piece, and the magnet is fixedly connected with one of the screen and the fixing piece, which is not fixedly connected with the coil; the axis of the coil is parallel to the surface of the screen, the magnet is positioned on one side of the coil, the wiring area comprises a first wiring area close to the screen and a second wiring area far away from the screen, at least one of the two wiring areas penetrates through a magnetic field generated by the magnet, the coil is configured to be capable of being introduced with an alternating current signal, and an ampere force in a direction vertical to the surface of the screen is generated between the coil and the magnet; the vibration assembly is subjected to alternating amperage forces transmitted by the drive assembly to vibrate the screen relative to the mount to produce sound.

Description

Screen vibration sound production device and electronic product

Technical Field

The invention belongs to the technical field of electronic products, and particularly relates to a screen vibration sounding device and an electronic product.

Background

The sound generating device is an important electroacoustic transducer element in electronic products, and is used for converting current signals into sound. Along with the rapid development of electronic products in recent years, sound generating devices applied to the electronic products are also improved correspondingly.

The traditional sound production device for the mobile phone receiver adopts the principle that the vibrating diaphragm pushes air to vibrate and produce sound. Recently, as a comprehensive screen becomes a main development direction of a mobile phone, how to realize a receiver function under a screen non-opening design and have better listening experience is a technical problem facing the current. In this regard, those skilled in the art have developed a technical solution for sounding by using screen vibration.

One of the technical solutions adopts a linear vibration motor to drive the screen to vibrate, as shown in fig. 1. The linear vibration motor includes a vibrator 01, and the vibrator 01 is connected to a spring 03. The linear vibration motor has a housing 02, and the housing 02 encloses the vibrator 01, the spring 03, and the like. The motor housing 02 is fixedly attached to the inner surface of the cell phone screen 04. After the motor is electrified to work, the vibrator 01 can vibrate, and then the spring 03 is pulled to generate elastic deformation. The vibration that spring 03 elastic deformation produced is transmitted to the screen through casing 02 on, and then is the screen vibration sound production. The screen vibration sound production is realized by directly converting the existing linear vibration motor into the technical scheme of screen sound production by the technical personnel in the field. However, this solution has the disadvantage that the vibrations generated by the vibrator 01 are transmitted to the entire motor via the spring 03, causing the motor to vibrate together with the housing 02. In fact, the vibrator 01 resonates with the housing 02 and the screen to drive the screen to vibrate and generate sound. In order to form resonance and make the screen reach the amplitude required by the performance, the vibrator of the vibration motor needs to generate vibration with larger amplitude. Therefore, the vibration motor itself needs to occupy a larger space in the vibration direction of the vibrator, which is very disadvantageous to the light and thin structural design of the cellular phone. On the other hand, the linear vibration motor has a relatively complex internal structure and a large number of parts, which increases the assembly difficulty and the product cost.

Another technical solution adopted by those skilled in the art is shown in fig. 2, and the technical solution adopts a structural distribution manner that one electromagnet 05 and one magnet 06 are oppositely arranged, and by turning on and off the electromagnet 05 or switching the magnetic poles of the electromagnet 05, a variable adsorption and repulsion action is generated between the electromagnet 05 and the magnet 06. Then the magnet 06 is fixed on the mobile phone screen 04, and the electromagnet 05 is fixed on the immobile component in the mobile phone, so that the mobile phone screen 04 can vibrate.

In this solution, assuming that the vertical displacement is x, an attractive force is present between the two magnets, and a force f (x) is present between the first magnet and the second magnet, which force is related to the displacement. The restoring force of the self-rigidity of the screen is F (kmsx), and a state of force balance exists at the moment

After the coil of the electromagnet 05 is energized, the magnetic field between the two magnets is disturbed, and thus the forces between the electromagnet 05 and the magnet 06 are out of balance, for example: because of the cocurrent magnetic field of the current enhanced attraction, the two magnets have a tendency to approach each other, and the screen has an opposite restoring force and a damping force during the motion, so the motion equation is:

wherein B is the equivalent magnetic induction intensity, H is the equivalent magnetic field intensity, and S is the equivalent area of the interaction between the two permanent magnets.

However, the technical scheme also has the problem of large occupied space, and is not beneficial to the structural design of thinning the mobile phone. On the premise that the screen 04 of the mobile phone generates a large enough amplitude, a sufficient space needs to be reserved between the two magnets, otherwise, collision between the magnets and the electromagnet 05 can be caused, and the acoustic performance of screen sounding is seriously affected. Therefore, more space is inevitably occupied in the thickness direction of the mobile phone. Moreover, the acting direction of the attractive and repulsive forces between the magnets is influenced by the axial direction of the coil and the magnetic pole direction of the magnets, and even a small deviation of the magnetic poles can cause the acting forces applied to the two magnets to be not perpendicular to the direction of the screen, so that the screen is easily damaged in vibration.

Disclosure of Invention

The invention aims to provide a new technical scheme for sounding by screen vibration.

According to a first aspect of the present invention, there is provided a screen vibration sound emission device including:

a vibration assembly including a screen and a mount, the screen configured to be vibratable relative to the mount;

the driving assembly comprises at least one coil and at least one magnet, the coil is wound by a wire along one direction to form a closed annular structure, a through hole is formed in the middle of the coil, a wiring area of the coil is arranged around the through hole, the coil is fixedly connected with one of the screen or the fixing piece, and the magnet is fixedly connected with one of the screen and the fixing piece, which is not fixedly connected with the coil;

the axis of the coil is parallel to the surface of the screen, the coil is in a vertical posture relative to the screen, the magnet is positioned on one side of the coil, the annular end face of the coil faces the magnet, the routing area comprises a first routing area close to the screen and a second routing area far away from the screen, the routing directions of the first routing area and the second routing area are parallel to the surface of the screen, at least one of the two routing areas penetrates through a magnetic field generated by the magnet, the coil is configured to be capable of being fed with an alternating current signal, the energized routing area penetrates through the magnetic field generated by the magnet, and an ampere force in a direction perpendicular to the surface of the screen is generated between the coil and the magnet;

alternating current signals led into the coil enable the direction of the ampere force to change in an alternating and reverse mode, and the vibrating assembly is subjected to the alternating ampere force transmitted by the driving assembly so that the screen can vibrate and sound relative to the fixing piece.

Optionally, the driving assembly is configured to provide two magnets corresponding to one coil, the coil is disposed between the two magnets, two annular end surfaces of the coil face the two magnets, respectively, and a magnetic field is formed between the two magnets.

Optionally, the magnetic pole direction of one of the magnets is: the N pole is close to the screen, and the S pole is far away from the screen;

the magnetic pole direction of the other magnet is as follows: the N pole is far away from the screen, and the S pole is close to the screen;

a magnetic field is formed between the magnetic poles of the two magnets close to the screen, and the first wiring area penetrates through the magnetic field; a magnetic field is formed between the magnetic poles of the two magnets far away from the screen, and the second wiring area penetrates through the magnetic field.

Optionally, the magnet is a halbach magnet, and the side of the magnet close to the coil corresponds to the side of the halbach magnet where the magnetic field is enhanced.

Optionally, at least one of the first trace area and the second trace area is directly opposite to the magnetic pole on the side where the magnetic field of the halbach magnet is enhanced.

Optionally, the driving assembly is configured to provide two coils corresponding to one magnet, the two coils being respectively located at both sides of the magnet, the magnet forming a magnetic field at both sides thereof.

Optionally, at least two sets of drive assemblies are included.

Optionally, the drive assembly includes a circuit board electrically connected to the coil, the circuit board and coil being disposed on the same component of the vibration assembly.

According to another aspect of the present invention, there is also provided an electronic product, including:

the screen vibration sounding device;

the product main part, the screen sets up in the product main part, the mounting is a part of structure of product main part, drive assembly sets up in the product main part.

Optionally, the fixing part is a middle frame or a side wall in the product main body.

According to one embodiment of the disclosure, the space occupied by the screen sounding device is effectively reduced.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic side cross-sectional view of a prior art screen shot technique;

FIG. 2 is a schematic side cross-sectional view of another prior art screen shot technique;

FIG. 3 is a schematic side cross-sectional view of a screen vibrating sound generator according to the present invention;

FIG. 4 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

FIG. 5 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

FIG. 6 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

FIG. 7 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

FIG. 8 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

FIG. 9 is a schematic side cross-sectional view of another screen vibrating sound generator provided by the present invention;

fig. 10 is a schematic partial side cross-sectional view of an electronic product provided by the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The invention provides a screen vibration sound production device which comprises a vibration assembly and a driving assembly. As shown in fig. 3 and 4, the vibration assembly includes a screen 11 and a fixed member 12, and the screen 11 is configured to be capable of vibrating relative to the fixed member 12. The fixing member 12 may be a fixing component of the electronic device to which the sound generating apparatus is applied, or may be a separately disposed fixed part. The drive assembly then comprises at least one coil 21 and at least one magnet 22. The coil 21 is wound by a conducting wire along one direction to form a closed annular structure, a through hole 211 is formed in the center of the coil 21, and a wiring area of the coil 21 is arranged around the through hole. The routing area refers to an area where the lead wire in the coil 21 actually passes through, and the whole routing area is annular. The coil 21 is fixed to one of the screen 11 or the fixing member 12, and the magnet 22 is fixed to the other of the screen 11 or the fixing member 12 where the coil 21 is not provided. In the embodiment shown in fig. 3 and 4, the coil 21 is fixedly attached to the screen 11, and the magnet 22 is fixedly attached to the fixing member 12.

The coil 21 in the form of a closed loop has its own axis, and in the embodiment of the present invention, the axis of the coil 21 is parallel to the surface of the screen 11, and as shown in fig. 3, the coil 21 is in a vertical posture with respect to the screen 11. The magnet 22 is located on one side of the coil 21, the annular end surface of the coil 21 faces the magnet 22, the axis of the coil 21 and the surface of the screen 11 are in a horizontal posture, and the magnet 22 is located on the left side of the coil 21. In yet another embodiment, as shown in fig. 4, the magnet 22 is located to the right of the coil 21. The routing areas of the coils 21 include a first routing area 212 close to the screen and a second routing area 213 far from the screen. The first and second routing areas 212, 213 are routed parallel to the surface of the screen, in the embodiment shown in fig. 3 and 4, in the form of tracks running inwards and outwards along the paper. The magnet 22 is capable of generating a magnetic field, and at least one of the first trace area 212 and the second trace area 213 passes through the magnetic field generated by the magnet 22. Thus, when an alternating current signal is applied to the coil 21, an ampere force can be generated between the coil 21 and the magnet 22. The energized trace region passes through the magnetic field and can generate an ampere force. Since the magnets 22 are disposed at the sides of the coils 21, a portion of the magnetic field generated by the magnets 22 can pass through the coils 21 in a direction parallel to the surface of the screen 11, thereby generating an ampere force in a direction perpendicular to the surface of the screen 11.

Because the coil and the magnet are respectively arranged on the screen and the fixed piece, and the current signal introduced into the coil is an alternating signal, the direction of the generated ampere force is also changed in an alternating and opposite way. The ampere force can be transmitted directly to the screen through the drive assembly. As shown in fig. 3 and 4, the coil 21 can directly drive the screen 11 when receiving an ampere force. The ampere force can enable the screen and the fixing piece to generate relative displacement, and further enable the screen to vibrate and generate sound relative to the fixing part.

Compared with the prior art, the screen vibration sound production device provided by the invention has a simpler structure and uses fewer parts. Taking the embodiment shown in fig. 3 as an example, the coil 21 and the magnet 22 are directly disposed on the screen 11 and the fixing member 12, respectively, so that compared with the prior art, parts such as a housing and a spring are omitted, and the complexity of the product structure is reduced. Moreover, the direct driving mode of directly connecting the driving component and the vibration component simplifies the principle of driving the screen to vibrate, and the screen can directly generate vibration after receiving ampere force. The design mode effectively improves the vibration conversion efficiency, and the vibration of the screen is not required to be triggered to resonate through the vibration of the vibrator. The design enables the amplitude generated by the screen to be basically consistent with the amplitude generated by the driving assembly, and the space reserved for the driving assembly can be designed according to the performance requirement on the amplitude of the screen. There is no need to reserve a vibration space for the driving assembly which is significantly larger than the maximum amplitude of the screen. On the other hand, the magnet 22 is provided on the side surface of the coil 21, and the magnet 22 and the coil 21 do not interfere with each other in the vibration path. By means of the distribution design, the space occupied by the vibration component in the vibration direction can be reduced. In fig. 3, the space occupied in the up-down direction is reduced.

By combining the advantages, the screen vibration sound production device provided by the invention reduces the parts, simplifies the structure, obviously reduces the space occupied by the driving component in the vibration direction, and is suitable for the light and thin design requirements of electronic products such as mobile phones and the like.

Preferably, the drive assembly is configured in such a manner that two magnets 22 are provided corresponding to one coil 21, as shown in fig. 5 and 6. The two magnets 22 are respectively located on two sides of the coil 21 along the axial direction of the coil 21, the coil 21 is sandwiched between the two magnets 22, and two annular end surfaces of the coil 21 respectively face the two magnets 22. A magnetic field is formed between the two magnets 22, and the first and second routing areas 212 and 213 of the coil 21 can pass through the magnetic field, thereby generating an ampere force between the magnets 22 and the coil 21. The magnetic field generated by the two magnets is better in stability, symmetry and magnetic field intensity, so that the ampere force generated between the coil and the magnets is stronger, the direction of the ampere force is not easy to incline, and the like, and the vibration effect of the screen is more stable. In addition, by arranging the two magnets, the magnetic field formed between the two magnets is more concentrated and stronger in magnetic field intensity relative to the magnetic field formed by one magnet on the side close to the coil, and the magnetic field generated by the magnet is effectively utilized.

In the embodiment shown in fig. 3-6, the portions capable of causing the coil 21 to generate an upward or downward movement of an ampere force are the upper and lower trace areas (i.e., the portions with cross-hatching in fig. 1-4) of the coil 21. Therefore, in order to improve the utilization rate of the magnetic field, the magnetic field should be passed through the two sections of routing areas as much as possible.

The present invention provides a preferred embodiment of the magnetic circuit distribution when two magnets 22 are used, as shown in fig. 3. For the magnet 22 on the left, its N-pole is away from the screen 11, i.e. the N-pole is facing upwards; its S pole is close to the screen 11, i.e. S level is directed downwards. For the magnet 22 on the right, its N pole is close to the screen 11, i.e. the N pole is directed downwards; with its S-pole facing away from the screen 11, i.e. with the S-pole facing upwards. In this configuration of magnets, a magnetic field can be formed between the magnetic poles of the two magnets 22 near the screen 11, for example, a magnetic field extending from the bottom right N pole to the bottom left S pole, through which the first trace area 212 passes. A magnetic field can be formed between the magnetic poles of the two magnets 22 far away from the screen 11, for example, a magnetic field extending from the upper left N pole to the upper right S pole, through which the second trace area 213 passes. In this way, the magnetic field passes through both wire routing areas of the coil 21, which can effectively generate the ampere force for vibration, and the direction of the magnetic field is substantially perpendicular to the direction of the current in the coil 21, so that the efficiency of converting the ampere force into the magnetic field is higher. Further, the directions of the magnetic fields passing through the upper wiring area and the lower wiring area are opposite, and the directions of the currents in the upper wiring area and the lower wiring area are also opposite, so that the directions of the ampere force generated by the upper wiring area and the lower wiring area are the same, and the magnitude of the ampere force generated between the coil and the magnet is obviously improved. The design mode can obviously improve the amplitude and the sensitivity of screen vibration.

For the embodiment shown in fig. 1 and 2, in which only one magnet 22 is used to cooperate with the coil 21 to generate an ampere force, the magnetic poles of the magnet 22 are preferably distributed in a direction in which one magnetic pole is close to the screen 11 and the other magnetic pole is far from the screen 11. Therefore, the directions of the magnetic fields passing through the upper and lower wiring areas are opposite, the utilization rate of the wiring areas of the coil is improved, and the generated ampere force is improved.

The present invention does not exclude an embodiment in which the magnetic poles of the magnets are arranged toward the coils. The magnetic pole of the magnet faces the coil and is aligned with one of the wiring areas at the upper end and the lower end of the coil, so that proper ampere force can be generated between the coil and the magnet to drive vibration.

Taking the embodiment shown in fig. 5 as an example, when the screen 11 is in a rest position relative to the fixing member 12, the position of the first routing area 212 of the coil 21 in the direction perpendicular to the surface of the screen 11 corresponds to the position of the magnetic poles of the two magnets 22 close to the screen 11. Accordingly, the position of the second trace area 213 in this direction corresponds to the position of the magnetic poles of the two magnets away from the screen 11. Thus, the two routing areas respectively penetrate through the magnetic fields which are formed between the two pairs of magnetic poles of the two magnets and are parallel to the surface of the screen.

After the current signal is applied to the coil 21, for example, the first applied signal is directed from the inside of the paper surface to the outside of the paper surface in the first trace region 212, and is directed from the outside of the paper surface to the inside of the paper surface in the second trace region 213. This signal direction characteristic is due to the fact that the coil is formed by winding a wire in one direction. At this time, the magnetic fields of the two magnets 22 close to the screen 11 propagate from the right N pole to the left S pole, and a downward ampere force is generated according to the left-hand rule of the ampere force. The magnetic fields of the two magnets 22 away from the screen 11 propagate from the N pole on the left to the S pole on the right, producing a downward ampere force according to the left-hand rule for ampere forces. The coil 21 directly pushes the screen 11 to move downward after receiving an ampere force.

Due to the alternating signals introduced into the coils, and then, the signals are reversely converted, the direction of the signals in the first wiring region 212 is from the outside of the paper surface to the inside of the paper surface, and the direction of the signals in the second wiring region 213 is from the inside of the paper surface to the outside of the paper surface. According to the left and right rules of ampere force, the two wiring areas generate upward ampere force. The coil 21 directly pulls the screen upwards after the ampere force is applied.

Through the principle, the driving assembly realizes the effect of directly driving the screen to vibrate.

The invention provides two specific connection forms between the magnet and the fixing piece. As shown in fig. 3 and 5, the fixing member 12 may be a plate-shaped structure having a notch or opening 221, and the notch or opening 221 allows the coil 21 to pass through. The magnet 22 is disposed in the opening 221, and a sidewall of the magnet 22 may be connected to a sidewall of the opening 221. The design scheme has the advantages that the magnet occupies less space in the screen vibration direction, and a part of the thickness of the magnet is overlapped with the fixing piece, so that the light and thin design of electronic products such as mobile phones is more met.

As shown in fig. 6, the fixing member 12 may be a plate-shaped structure or an inner surface of a housing, and the magnet 22 is directly fixed on one side surface of the fixing member 12. The advantage of this kind of design lies in, the magnet is higher with the connected reliability of mounting, and the difficult condition that appears rocking, becomes flexible of magnet for ampere force can drive the screen vibration more efficiently.

Preferably, as shown in fig. 7, the magnet 22 is a halbach magnet. The Halbach magnet has the characteristics of strengthening the magnetic field on one side of the Halbach magnet and weakening the magnetic field on the other side of the Halbach magnet. In the embodiment of the present invention, the side of the magnet 22 close to the coil 21 corresponds to the side where the magnetic field of the halbach magnet is enhanced. The halbach magnet has a significant effect of strengthening the magnetic field, and near the halbach magnet, its magnetic field can radiate outward in a direction close to perpendicular to the side wall of the magnet 22. Depending on the degree of magnetization of the magnets used, it is even possible to make their magnetic field strength and field utilization rate exceed the embodiment in which magnets are provided on both sides of the coil. Even if the Halbach magnet is provided only on one side of the coil, a strong ampere force can be generated between the coil and the magnet.

The invention provides a magnetic pole distribution mode of a Halbach magnet. As shown in fig. 7, the halbach magnet includes three magnets, which are stacked in sequence from top to bottom. The magnetic poles of the two magnets at the top layer and the bottom layer face the side faces of the Halbach magnet, namely face towards or depart from the coil 21, and the magnetic poles of the magnets at the middle layer face the upper magnet and the lower magnet. On the side close to the coil 21, i.e., the side where the magnetic field of the halbach magnet is strengthened, the magnetic pole of the upper magnet close to the coil 21 and the magnetic pole of the middle magnet close to the upper magnet are of the same polarity, and the magnetic pole of the lower magnet close to the coil 21 and the magnetic pole of the middle magnet close to the lower magnet are of the same polarity. In the embodiment shown in fig. 7, the right side of the upper magnet is the N pole, and the N pole of the middle magnet is closely attached to the lower surface of the upper magnet; the right side of the lower magnet is an S pole, and the S pole of the middle magnet is tightly attached to the upper surface of the lower magnet. Thus, an intensified magnetic field is formed on the right side of the halbach magnet. The magnetic induction lines radiated from the N pole of the upper magnet are repelled by the N pole of the middle magnet, and only the right radiation can be concentrated. Further, the south pole of the lower magnet receives the magnetic induction lines emitted from the north pole, and the magnetic induction lines are repelled by the south pole of the middle magnet, so that the magnetic induction lines are perpendicularly and intensively transmitted back to the south pole of the lower magnet only from the right side of the lower magnet. Under the effect of the combined magnet, the magnetic induction lines on the right side of the magnet 22 are more concentrated and are oriented substantially perpendicular to the side walls of the magnet 22, i.e., perpendicular to the trace area of the coil 21. Such an embodiment can significantly enhance the ampere force generated between the magnet 22 and the coil 21.

Preferably, at least one of the first and second trace regions is directed to a magnetic pole on a side where a magnetic field of the halbach magnet is enhanced. The utilization rate of the magnetic field is further improved through the design. As shown in fig. 7, the second trace region 213 of the coil 21 corresponds to a position of the N pole of the upper magnet, and the first trace region 212 of the coil 21 corresponds to a position of the S pole of the lower magnet. The wiring area of the coil 21 accurately corresponds to the position of the magnetic pole, and the utilization rate of the magnetic field can be improved.

The present invention does not limit to which component of the vibration assembly the coil and the magnet are to be fixed, respectively. In the embodiment shown in fig. 3-6, the coil 21 is provided on the screen 11, whereas in the embodiment shown in fig. 7, the coil 21 is provided on the stationary member 12 and the magnet 22 is provided on the screen 11. The two fixing connection modes can be selected according to the specific application condition of the invention.

Preferably, the driving assembly may further include a magnetic conductive plate, and the magnetic conductive plate may be attached to the magnet, so as to form a beam-converging and concentrating effect on the magnetic field generated by the magnet. For example, in the embodiment shown in fig. 3, the left side of the magnet 22 may be provided with a magnetically permeable plate. The upper and lower sides of the magnet 22 may also be provided with magnetically conductive plates. By providing the magnetic conductive plate, the magnetic field generated by the magnet 22 can be concentrated in a direction in which the magnetic conductive plate is not covered, thereby increasing the magnetic field strength. The magnetically permeable plate is typically disposed on the side of the magnet 22 remote from the coil 21, or other surface not facing the coil 21.

The invention also provides alternative embodiments for the distribution and combination of the driving components. For example, two coils may be provided corresponding to one magnet, the two coils being respectively located on both sides of the magnet, and accordingly, the magnet can form a magnetic field on both sides thereof. In general, a magnetic field is formed around the magnet 22, and in the driving assembly of the present invention, for example, the magnet 22 shown in fig. 3, a magnetic field for generating an ampere force with the coil 21 is formed on both left and right sides. However, only the magnetic field to the right of the magnet 22 can be practically applied. In a preferred embodiment, one coil 21 is provided on each side of the magnet 22 as shown in fig. 3, which is effective in improving the utilization of the magnetic field. Both said coils 21 are arranged on the same part of the oscillating assembly.

Preferably, as shown in fig. 8, the driving assembly may include two coils 21 and three magnets 22. The three magnets 22 are sequentially arranged side by side, the two coils 21 are positioned on two sides of the magnet 22 in the middle, the two magnets 22 positioned at two ends are respectively combined with the magnet 22 in the middle, and the two voice coils are respectively clamped between the two magnets 22. The preferred combined embodiment can increase the magnitude of the ampere force generated by the driving assembly, and further, can make the ampere force acting on the fixing piece and the screen more uniform, and the generated vibration more stable. On the other hand, the utilization rate of the magnetic field of the driving assembly is also higher.

Preferably, in the embodiment shown in fig. 9, the screen-driven sound generating device comprises two sets of driving components. In other embodiments, more sets of drive assemblies may also be included. Two sets of driving assemblies can be arranged at different positions of the screen 11 corresponding to one set of vibration assemblies, the embodiment enables the ampere force generated between the screen 11 and the fixing piece to be more balanced, the screen generates vibration under the action of uniform ampere force, the vibration stability is better, the screen is not easy to damage, and the acoustic performance is better.

Optionally, the drive assembly further comprises a circuit board. The circuit board is electrically connected with the coil and is used for transmitting an electric signal so as to enable ampere force to be formed between the coil and the magnet. The circuit board is preferably provided on the same part of the vibration assembly as the coil. As shown in fig. 3 to 5, the circuit board 23 is attached to the inner surface of the screen 11, and the voice coil is also fixedly connected to the inner surface of the screen 11.

The invention also provides an electronic product, as shown in fig. 10. The electronic product comprises the screen vibration sounding device and a product main body 3. The electronic product may be a mobile phone or a tablet computer, and the invention is not limited thereto. The screen 11 is provided on the product body 3 and serves as a display screen of an electronic product. The screen 11 may be provided in a form that one end is rotatably connected to the product body 3 and the other end is freely movable; alternatively, a screen made of a material having a good elastic deformability may be used, and one end of the screen is fixedly connected to other fixed components, and the other end of the screen is freely movable. In this way, the screen 11 is able to generate vibrations with respect to the product body 3. A part of the structure of the product body 3 may be the fixing member 12, and the driving assembly is disposed in the product body 3. For example, as shown in fig. 10, the magnet 22 is fixedly provided on a part of the product body 3 corresponding to the fixing member 12, and the coil 21 is fixedly provided on the screen 11. The ampere force generated by the driving component can drive the screen to vibrate and sound. The screen vibration sound production device provided by the invention is adopted in the electronic product, so that the occupied space in the thickness direction of the electronic product parallel to the screen is less, the electronic product is more favorably designed to be thinner, and the design requirement of the electronic product for thinning is met. Furthermore, the design mode of directly driving the screen to vibrate is adopted, parts such as spring plates, shells and the like are omitted, the processing and assembling processes of products are simplified, and the cost is reduced.

Preferably, the fixing portion may be a middle frame, a side wall, or the like in the product body 3. In the product body 3, in order to house other electronic devices, the product body 3 is often configured with a partition, a middle frame, and other structural components, which have good structural stability in the electronic product, and are used for the electronic device, on the one hand, and for protecting the electronic device, on the other hand. Therefore, by using such a structural member in the product body 3 as the fixing portion, the conversion rate of the ampere force into the vibration can be increased, and the vibration reliability can be improved. The inner surface of the side wall of the product body 3 may also serve as the fixing portion, as shown in fig. 3, 4, and 7.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A screen vibration sound generating apparatus, comprising:

2. The screen vibration sound generating apparatus according to claim 1, wherein the driving unit is configured such that two of the magnets are disposed corresponding to one coil, the coil is disposed between the two magnets, two annular end surfaces of the coil face the two magnets, respectively, and a magnetic field is formed between the two magnets.

3. The screen vibration sound generating apparatus according to claim 2, wherein the magnetic pole direction of one of the magnets is: the N pole is close to the screen, and the S pole is far away from the screen;

4. The screen vibration sound generating apparatus according to claim 1, wherein the magnet is a halbach magnet, and a side of the magnet close to the coil corresponds to a side of the halbach magnet where a magnetic field is enhanced.

5. The screen vibration sound generating apparatus according to claim 4, wherein at least one of the first trace region and the second trace region is directed to a magnetic pole on a side where a magnetic field of the Halbach magnet is enhanced.

6. The screen vibration sound generating apparatus according to claim 1, wherein the driving unit is configured to provide two of the coils corresponding to one of the magnets, the two coils being respectively located on both sides of the magnet, the magnet forming magnetic fields on both sides thereof.

7. The screen vibration sound generating apparatus of claim 1, comprising at least two sets of drive assemblies.

8. The screen vibration sound generating apparatus of claim 1, wherein the driving assembly includes a circuit board, the circuit board being electrically connected to the coil, the circuit board and the coil being disposed on the same component of the vibration assembly.

9. An electronic product, comprising:

the screen vibration sound generating apparatus of any one of claims 1 to 7;

10. The electronic product according to claim 9, wherein the fixing portion is a middle frame or a side wall in the product body.