WO2020135288A1

WO2020135288A1 - Screen vibration sound production apparatus and electronic product

Info

Publication number: WO2020135288A1
Application number: PCT/CN2019/127255
Authority: WO
Inventors: 朱跃光; 刘春发; 毛东升; 史德璋
Original assignee: 歌尔股份有限公司
Priority date: 2018-12-24
Filing date: 2019-12-23
Publication date: 2020-07-02
Also published as: CN209057357U

Abstract

Disclosed are a screen vibration sound production apparatus and an electronic product. The screen vibration sound production apparatus comprises: a vibration assembly, the vibration assembly comprising a screen and a fixed piece, the screen being configured to vibrate with respect to the fixed piece; a drive assembly, the drive assembly comprising a coil and a magnet set, the coil being fixedly connected to one of the screen and the fixed piece, the magnet set being fixedly connected to the one of the screen and the fixed piece not fixedly connected to the coil, the coil being a closed annular structure formed by winding a wire in a single direction, an axis of the coil being perpendicular to a surface of the screen, magnetic gaps being formed between magnets of the magnet set, a magnetic field being provided in the magnetic gaps, the coil extending into the magnetic gaps, the coil being configured to pass an alternating current signal, the coil passing through the magnetic field generated by the magnet set, an ampere force perpendicular to the surface of the screen being generated between the magnet set and the coil, the drive assembly being configured to drive the screen to vibrate with respect to the fixed piece and produce sound.

Description

Screen vibration sound device and electronic product

Technical field

The technical field of electronic products of the present invention, in particular, relates to a screen vibration sound generating device and electronic products.

Background technique

The sound-generating device is an important electroacoustic transducing element in electronic products, which is used to convert current signals into sound. With the rapid development of electronic products in recent years, the sound-generating devices used in electronic products have also been improved accordingly.

The principle used by the conventional sound-generating device for the handset of the mobile phone is that the diaphragm pushes the air to vibrate and sound. Recently, as the full screen has become the main development direction of mobile phones, how to realize the earpiece function under the design of the screen without openings, and at the same time have a better listening experience, is currently a technical challenge. In this regard, those skilled in the art have developed a technical solution that uses screen vibration and sound.

One of the technical solutions uses a linear vibration motor to drive the screen to vibrate, as shown in Figure 1. The linear vibration motor has a vibrator 01 connected to the spring 03. The linear vibration motor has a housing 02 which encloses the vibrator 01, spring 03 and other components therein. The motor case 02 is fixedly connected to the inner surface of the mobile phone screen 04. After the motor is energized, the vibrator 01 will vibrate, which in turn causes the spring 03 to elastically deform. The vibration generated by the elastic deformation of the spring 03 is transmitted to the screen through the housing 02, and then the screen vibrates and sounds. A person skilled in the art directly converts the existing linear vibration motor into a technical solution for screen sound generation, thereby realizing screen vibration sound generation. However, the disadvantage of this technical solution is that the vibration generated by the vibrator 01 is transmitted to the entire motor through the spring 03, so that the motor and the housing 02 vibrate together. In fact, the vibrator 01 resonates with the case 02 and the screen to drive the screen to vibrate and sound. In order to form resonance and make the screen reach the amplitude required for performance, the vibrator of the vibration motor needs to generate vibration with a larger amplitude. Therefore, the vibration motor itself needs to occupy more space in the vibration direction of the vibrator, which is very disadvantageous for the design of the thin and light structure of the mobile phone. On the other hand, the internal structure of the linear vibration motor is relatively complex and has many parts, which increases the difficulty of assembly and increases the cost of the product.

Another technical solution adopted by those skilled in the art is shown in FIG. 2. This technical solution adopts a structure distribution manner in which one electromagnet 05 and one magnet 06 are placed relative to each other, by opening and closing the electromagnet 05, or switching the electromagnet 05 The magnetic pole makes the electromagnet 05 and the magnet 06 have varying adsorption and repulsion effects. Then, the magnet 06 is fixed on the mobile phone screen 04, and the electromagnet 05 is fixed on the stationary parts of the mobile phone, so that the mobile phone screen 04 can be vibrated. However, this technical solution also has the problem of taking up more space, which is not conducive to the thin and thin structure design of the mobile phone. In order to make the mobile phone screen 04 generate a sufficiently large amplitude, enough space needs to be left between the two magnets, otherwise it will cause a collision between the magnet and the electromagnet 05, which seriously affects the acoustic performance of the screen sound. For this reason, it will inevitably occupy more space in the thickness direction of the mobile phone. Moreover, the direction of the mutually attracting and repelling force between the magnets is affected by the axial direction of the coil and the magnetic pole direction of the magnet. Even a slight deviation of the magnetic pole will cause the two magnets to receive forces that are not perpendicular to the screen , Which in turn makes the screen vulnerable to vibration.

Summary of the invention

An object of the present invention is to provide a new technical solution for screen vibration and sound.

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

A vibration component, the vibration component includes a screen and a fixing member, the screen is configured to be able to vibrate relative to the fixing member;

A driving assembly, the driving assembly includes a coil and a magnet group, the coil is fixedly connected to one of the screen or the fixing member, and the magnet group is fixed to one of the screen and the fixing member that is not fixedly connected to the coil connection;

The coil is wound by a wire in one direction to form a closed ring structure, the axis of the coil is perpendicular to the surface of the screen, and a magnetic gap is formed between each magnet of the magnet group, and the magnetic gap has a magnetic field , The coil extends into the magnetic gap, the coil is configured to pass an alternating current signal, the coil passes through the magnetic field generated by the magnet group, and the magnet group is perpendicular to the coil Ampere force on the surface of the screen;

The driving assembly is configured to drive the screen to vibrate and sound relative to the fixing member.

Optionally, the magnet group includes a center magnet and a side magnet, the side magnet is disposed at a position around the center magnet, and the magnetic gap is formed between the side magnet and the center magnet.

Optionally, the side magnet has a ring shape, and the side magnet surrounds the central magnet.

Optionally, the magnetic pole direction of each magnet in the magnet group is perpendicular to the surface of the screen, and the magnetic pole directions of the magnets located on both sides of the magnetic gap are opposite.

Optionally, the driving assembly further includes a magnetic permeable plate, the magnetic permeable plate is disposed on a surface of the magnet facing the screen and/or away from the surface of the screen, the magnetic permeable plate is It is configured to concentrate the magnetic field generated by the magnet into the magnetic gap.

Optionally, the driving assembly includes a circuit board, the circuit board and the coil are electrically connected, and the circuit board and the coil are disposed on the same component of the vibration assembly.

Optionally, the circuit board is sandwiched between the coil and the vibration component to which the coil is fixed.

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

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

The above screen vibration sound device;

For the product body, the screen is provided on the product body, the fixing member is a part of the structure of the product body, and the driving assembly is provided in the product body.

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

According to an embodiment of the present disclosure, it is possible to directly drive the screen to vibrate and sound, simplifying the structure of the screen to vibrate and sound.

Other features and advantages of the present invention will become clear by the following detailed description of exemplary embodiments of the present invention with reference to the drawings.

BRIEF DESCRIPTION

The drawings incorporated in and forming a part of the specification illustrate embodiments of the invention, and together with the description thereof, serve to explain the principles of the invention.

FIG. 1 is a schematic side sectional view of a screen sounding technical solution in the prior art;

2 is a schematic side sectional view of another screen sounding technical solution in the prior art;

3 is a schematic side cross-sectional view of a screen vibration sound-generating device provided by the present invention;

4 is a schematic side view of some components of the screen vibration sound generating device provided by the present invention.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of components and steps, 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 actually merely illustrative, and in no way serves as any limitation on the invention and its application or use.

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the specification.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

The invention provides a screen vibration sound-generating device, which includes a vibration component and a driving component. As shown in FIG. 3, the vibration assembly includes a screen 11 and a fixing member 12, and the screen 11 is configured to vibrate relative to the fixing member 12. The fixing member 12 may be a certain fixing member in the electronic device to which the sound-emitting device is applied, or may be a separately arranged fixed part. The driving assembly includes a coil 21 and a magnet group. The coil 21 is wound by a wire in one direction in a closed ring structure. The coil 21 is fixed on one of the screen 11 or the fixing member 12, and the magnet group is fixed on the screen 11 or the fixing member 12 where the coil 21 is not provided. One on. In the embodiment shown in FIGS. 3 and 4, the coil 21 is fixedly connected to the screen 11, and the magnet group is fixedly connected to the fixing member 12. In other embodiments, the coil may be fixedly connected to the fixing member, and the magnet group is fixed to the screen.

The coil 21 in a closed ring shape has an axis. In the embodiment of the present invention, the axis of the coil 21 is perpendicular to the surface of the screen 11. As shown in FIG. 3, the coil 21 is opposite to the screen 11 In a horizontal position. At least two magnets 22 are included in the magnet group. A magnetic gap 220 is formed between the magnets 22. Each magnet 22 forms a magnetic field in the magnetic gap 220. The magnetic field in the magnetic gap 220 extends from the magnet 22 on one side to the magnet 22 on the other side. As shown in FIGS. 3 and 4, the opening of the magnetic gap 220 faces the coil 21 so that the coil 21 can extend into the magnetic gap 220. The coil 21 is configured to pass an alternating current signal, and the coil 21 passing the current signal passes through the magnetic field in the magnetic gap 220, so that an ampere force can be generated between the coil 21 and the magnet 22. Since the direction of the magnetic field in the magnetic gap 220 is parallel to the surface of the screen 11, the direction of the generated ampere force is also perpendicular to the surface of the screen 11.

Since the coil and the magnet set are respectively arranged on the screen and the fixing member, and the current signal passing through the coil is an alternating signal, the direction of the generated ampere force also changes alternately and inversely. Ampere force can be directly transmitted to the screen through the driving component. As shown in FIG. 3, the coil 21 can directly drive the screen 11 after receiving the ampere force. The above-mentioned ampere force will cause a relative displacement between the screen 11 and the fixing member 12, thereby causing the screen to vibrate and sound relative to the fixing part.

Compared with the prior art, the screen vibration sound-generating device provided by the present invention has a simpler structure and occupies less space in a direction perpendicular to the surface of the screen. Further, the screen vibration sound-generating device provided by the present invention can directly drive the screen vibration. 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, which saves the housing, spring and other components compared with the prior art, reducing the complexity of the product structure degree. Moreover, the direct driving method of directly connecting the driving component and the vibration component simplifies the principle of driving the vibration of the screen, and the screen can directly generate vibration after being subjected to ampere force. This design method effectively improves the vibration conversion efficiency, without the need to cause resonance through the vibration of the vibrator to drive the screen vibration. This design makes the amplitude that the screen can produce basically the same as the amplitude that the driving component can produce. The space reserved for the driving component can be designed according to the performance requirements for the screen amplitude. There is no need to reserve a vibration space for the drive assembly that is significantly greater than the maximum amplitude of the screen. On the other hand, the coil 21 corresponds to the magnetic gap 220 between the magnets 22. The magnet 22 is located on the side of the coil 21. The magnet 22 and the coil 21 do not interfere with each other in the vibration path. With this distributed design, the space occupied by the vibration component in the vibration direction can also be reduced. In Fig. 3, the space occupied in the up and down directions is reduced.

In view of the above advantages, the screen vibration sound-generating device provided by the present invention not only reduces the parts and simplifies the structure, but also significantly reduces the space occupied by the driving component in the vibration direction, and is suitable for the thin and thin design requirements of electronic products such as mobile phones.

Optionally, the magnet group includes a center magnet and a side magnet, and the center magnet and the side magnet are both disposed on a part of the same vibration assembly. The side magnet is disposed at a position around the center magnet. For example, the magnet group may include three magnets, which are two side magnets and one center magnet, respectively. The two side magnets are respectively disposed at symmetrical positions on both sides of the center magnet, for example, as shown in FIG. 3, the side magnets are located on the left and right sides of the center magnet. The magnetic gap 220 is formed between the side magnet and the center magnet. The central magnet is located in the area surrounded by the coil, and the edge magnet is located outside the area surrounded by the coil. At least a part of the voice coil can penetrate into the magnetic gap between the side magnet and the center magnet, that is, through the magnetic field between the center magnet and the side magnet. In the embodiment shown in FIG. 3, the side magnets are in symmetrical positions on both sides of the center magnet, and the ampere force generated between the coil 21 is also symmetrical, which can better improve the acoustic performance of the screen vibration.

Preferably, the side magnet has a ring structure, and the side magnet is arranged around the central magnet, and a 360-degree magnetic gap is formed around the central magnet. The coil can then extend completely into the magnetic gap in its own circumferential direction. The advantage of this embodiment is that when the coil is fed with a current signal, the ampere force can be applied to all positions of the coil, and the overall force of the coil is more balanced and uniform, thereby improving the stability of screen vibration, preventing screen polarization, and reducing The sound is distorted.

Preferably, the magnetic pole direction of each magnet in the magnet group is perpendicular to the surface of the screen. However, the magnetic pole directions of the two magnets located on both sides of the magnetic gap are opposite. As shown in FIG. 4, the S pole of the magnet 22 in the middle faces the screen 11, and the N pole faces away from the screen 11. A magnetic gap 220 is formed between the magnets 22 on the left and right sides and the magnet 22 in the middle, and the N poles of the magnets 22 on the left and right sides face the screen 11, and S is away from the screen 11. In this embodiment, a magnetic field with high strength and a direction parallel to the surface of the screen 11 can be formed between the magnetic poles of each magnet 22 near the screen 11, and the coil can pass through the magnetic field as long as it extends into the magnetic gap. Through this design scheme, the utilization rate of the magnetic field can be effectively improved, and the efficiency of converting the magnetic field into ampere force can be improved. Moreover, the depth of the coil extending into the magnetic gap is minimized to avoid collision between the coil and the magnet group.

Preferably, the driving assembly may further include a magnetic conductive plate 22, and the magnetic conductive plate 22 may be attached to the magnet 22, so as to form a convergent and concentrated effect on the magnetic field generated by the magnet 22. The magnetic conducting plate 22 is covered on the surface of the magnet 22 facing the screen 11 and/or away from the surface of the screen 11, so that the magnetic field generated by the magnet is concentrated in the magnetic gap 220. For example, in the embodiment shown in FIG. 3, both the upper side and the lower side of the magnet 22 may be provided with magnetic conductive plates 22. The magnetic conducting plate 22 is usually disposed on the side of the magnet 22 away from the coil 21 or other surface not facing the coil 21.

Optionally, the driving assembly further includes a circuit board. The circuit board is electrically connected to the coil, and is used to transmit electrical signals, so that an ampere force can be formed between the coil and the magnet. The circuit board is preferably disposed on the same component of the vibration assembly as the coil. As shown in FIG. 3, the circuit board 24 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.

Preferably, the circuit board 24 is interposed between the coil 21 and the vibration component to which the coil 21 is fixed. As shown in FIG. 3, this design method can save space while forming a buffer between the coil 21 and the screen 11 through the circuit board 24. The reduction of the ampere force generated between the coil 21 and the magnet group is large, causing damage to the screen 11.

Preferably, the screen-driven sound generating device includes two sets of driving components. In other embodiments, more sets of driving components may be included. Corresponding to a set of vibration components, at least two sets of drive components can be configured at different positions on the screen. This embodiment makes the amp force generated between the screen and the fixture more balanced, and the screen generates vibration and vibration under the effect of uniform amp force The stability is better, the screen is not easy to damage, and the acoustic performance is better.

The invention also provides an electronic product. The electronic product includes the above-mentioned screen vibration sounding device and product main body. The electronic product may be a mobile phone or a tablet computer, etc. The present invention does not limit this. The screen is set on the product body and serves as a display screen of electronic products. The screen may be provided in a form where one end is rotatably connected to the main body of the product and the other end is freely movable; or, the screen may be made of a material with good elastic deformation ability, and the screen is fixedly connected to other fixed parts with one end The upper and the other end can be set in a freely movable form. In this way, the screen can generate vibrations relative to the product body. A part of the structure of the product body may serve as the fixing member, and the driving assembly is disposed in the product body. The magnet is fixedly arranged on a part of the product body equivalent to the fixing member, and the coil is fixedly arranged on the screen. The amp force generated by the drive assembly can drive the screen to vibrate and sound. Since the electronic product provided by the present invention adopts the screen vibration sound-generating device provided by the present invention, it takes up less space in the direction parallel to the thickness of the screen of the electronic product, which is more conducive to designing the electronic product thinner and satisfying the electronic product Thin and light design requirements. Further, the design method of directly driving the vibration of the screen omits parts such as shrapnel and shell, which simplifies the processing and assembly process of the product and reduces the cost.

Preferably, the fixing part may be a structure such as a middle frame or a side wall in the product body. In the product body, in order to place other electronic devices, the product body is often equipped with structural components such as partitions, middle frames, etc. These structural components have good structural stability in electronic products. On the one hand, they are used for electronic devices in the case, on the other hand Used to protect electronic devices. Therefore, using such structural members in the product body as the fixing portion can improve the conversion rate of the ampere force into vibration, and improve the vibration reliability. The inner surface of the side wall of the product body may also serve as the fixing portion.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A screen vibration sounding device, characterized in that it includes:

A vibration component, the vibration component includes a screen and a fixing member, the screen is configured to be able to vibrate relative to the fixing member;

A driving assembly, the driving assembly includes a coil and a magnet group, the coil is fixedly connected to one of the screen or the fixing member, and the magnet group is fixed to one of the screen and the fixing member that is not fixedly connected to the coil connection;

The coil is wound by a wire in one direction to form a closed ring structure, the axis of the coil is perpendicular to the surface of the screen, and a magnetic gap is formed between each magnet of the magnet group, and the magnetic gap has a magnetic field , The coil extends into the magnetic gap, the coil is configured to pass an alternating current signal, the coil passes through the magnetic field generated by the magnet group, and the magnet group is perpendicular to the coil Ampere force on the surface of the screen;

The driving assembly is configured to drive the screen to vibrate and sound relative to the fixing member.
The screen vibration sound generating device according to claim 1, wherein the magnet group includes a center magnet and a side magnet, the side magnet is disposed at a position around the center magnet, and the magnetic gap is formed in the Between the side magnet and the central magnet.
The screen vibration sound-generating device according to claim 2, wherein the side magnet has a ring shape, and the side magnet surrounds the center magnet.
The screen vibration sound-generating device according to claim 1, wherein the magnetic pole direction of each magnet in the magnet group is perpendicular to the surface of the screen, and the magnetic pole directions of the magnets located on both sides of the magnetic gap are opposite.
The screen vibration sound-generating device according to claim 1, wherein the driving assembly further comprises a magnetic conductive plate, the magnetic conductive plate cover is provided on the surface of the magnet facing the screen and/or away from the On the surface of the screen, the magnetic conductive plate is configured to concentrate the magnetic field generated by the magnet into the magnetic gap.
The screen vibration sound-generating device according to claim 1, wherein the driving assembly includes a circuit board, the circuit board and the coil are electrically connected, and the circuit board and the coil are disposed on the same component of the vibration assembly on.
The screen vibration sound-generating device according to claim 6, wherein the circuit board is interposed between the coil and the vibration component to which the coil is fixed.
The screen vibration sound-generating device according to claim 1, characterized by comprising at least two sets of driving components.
An electronic product, characterized in that it includes:

The screen vibration sound generating device according to any one of claims 1-8;

For the product body, the screen is provided on the product body, the fixing member is a part of the structure of the product body, and the driving assembly is provided in the product body.
The electronic product according to claim 9, wherein the fixing portion is a middle frame or a side wall in the product body.