WO2020135289A1

WO2020135289A1 - Screen vibration sound production apparatus and electronic product

Info

Publication number: WO2020135289A1
Application number: PCT/CN2019/127256
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: CN209057363U

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 magnetic core, a coil and a magnet, the coil being wound on the magnetic core, the magnet being fixedly connected to one of the screen and the fixed piece, the magnetic core and the coil being fixedly connected to the one of the screen and the fixed piece not fixedly connected to the magnet, an axis of the magnetic core being perpendicular to a surface of the screen, the magnet being located at a position adjacent to the magnetic core on the radial direction of the magnetic core, the magnetic pole direction of the magnet being perpendicular to the surface of the screen, the coil being configured to pass an alternating current signal, so that the magnetic core generates magnetic poles perpendicular to the surface of the screen, such that a magnetic force is generated between the magnetic core and the magnet in the direction perpendicular to the surface of the screen. The alternating current signal passing through the coil causes the magnetic poles generated by the magnetic core to alternatingly reverse, so that the direction of the magnetic force alternatingly reverses. The vibration assembly is subject to the alternating magnetic force transmitted by the drive assembly, so that the screen vibrates with respect to the fixed piece and produces sound.

Description

Screen vibration sounding 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 magnetic core, a coil, and a magnet, the coil is wound on the magnetic core, the magnet is fixedly connected to one of the screen or the fixing member, and the magnetic core and the coil are A fixed connection of the screen and the fixing member that is not fixedly connected to the magnet;

The axis of the magnetic core is perpendicular to the surface of the screen, the magnet is located adjacent to the magnetic core in the radial direction of the magnetic core, and the magnetic pole direction of the magnet is perpendicular to the surface of the screen. The coil is configured to pass an alternating current signal to cause the magnetic core to generate magnetic poles perpendicular to the surface of the screen, thereby generating a direction perpendicular to the surface of the screen between the magnetic core and the magnet Magnetic force

The alternating current signal passing through the coil causes the magnetic poles generated by the magnetic core to alternately and reversely change, thereby to alternately and reversely change the direction of the magnetic force, and the vibration component is subjected to the alternating The magnetic force causes the screen to vibrate and sound relative to the fixture.

Optionally, the drive assembly includes at least two of the magnets, each of the magnets is disposed around the magnetic core in a center-symmetric or rotationally symmetrical manner with respect to the axis of the magnetic core, and each of the magnets The direction of N pole and S pole is the same.

Optionally, the magnet is a ring magnet, and the axis of the ring magnet coincides with the axis of the magnetic core.

Optionally, the drive assembly further includes a magnetic core ring, and the magnetic core ring is sleeved on the magnetic core.

Optionally, the coil is wound in an area where the magnetic core is close to the screen, the magnetic core ring is sleeved in an area where the magnetic core is away from the screen, and the magnetic core ring is in contact with the coil, The magnetic core ring is configured to concentrate the magnetic field generated by the magnet on the magnetic core, so that the magnetic field passes through the coil in a direction parallel to the surface of the screen, and after a current signal is passed into the coil, Amps can be generated between the coil and the magnet.

Optionally, the fixing member is provided with an opening at a position directly facing the magnetic core, the opening is provided for inserting the magnetic core therein, and the magnet is provided at a position around the opening.

Optionally, the drive assembly further includes a magnetic conductive plate sandwiched between the magnet and the vibration component connected thereto.

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.

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, the space occupied by the screen sounding device is effectively reduced.

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 diagram 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, at least one magnet 22, and a magnetic core 23. The coil 21 is wound by a wire in one direction to form a closed ring structure, and the coil 21 is wound around the magnetic core. The magnet 22 is fixed to one of the screen 11 or the fixing member 12, and the magnetic core 23 and the coil 21 are fixed to the screen 11 or the fixing member 12 where the magnet 22 is not provided. In the embodiment shown in FIG. 3, the magnetic core 23 and the coil 21 are fixedly connected to the screen 11, and the magnet 22 is fixedly connected to the fixing member 12. In another embodiment, the magnetic core and the coil may be provided on the fixing member, and the magnet is fixed on the screen.

The magnetic core 23 has a columnar structure and has an axis. The magnetic core 23 is made of a magnetically conductive material. The coil 21 is wound on a cylindrical magnetic core 23, and the coil 21 is coaxial with the magnetic core 23. As shown in FIG. 3, the magnetic core 23 extends upward from the surface of the screen 11, and the coil 21 is wound at a position where the magnetic core 23 is close to the screen 11. The magnet 22 is located next to the iron core 23. Along the radial direction of the magnetic core and the coil, the magnet 22 is located adjacent to the coil 21 and the magnetic core 23, and the magnet 22 is not in contact with the coil 21 and the magnetic core 23. The magnetic pole direction of the magnet 23 is out of the surface of the screen 11. As shown in FIG. 4, the magnetic pole of the magnet 23 far from the screen 11 is N pole, and the magnetic pole close to the screen 11 is S pole. The magnetic poles of the magnet 23 extend in the vertical up and down directions. The magnet 22 can generate a magnetic field, and when a current signal is passed through the coil 21, the coil 21 and the magnetic core 23 can be combined to form an electromagnet, which can also generate a magnetic field. The magnetic poles of the magnetic core 23 also extend in a direction perpendicular to the surface of the screen 11 (ie, vertically up and down as shown in FIG. 3). The directions of the N pole and S pole of the magnetic core 23 can be determined according to the right-handed spiral rule. When an alternating current signal is passed into the coil 21, the direction of the magnetic pole of the magnetic core 23 will also alternately and reversely change. In this way, the magnetic force between the magnetic core 23 and the magnet 22 can be attracted or repelled in a direction perpendicular to the surface of the screen.

As shown in FIG. 4, when a current signal is passed into the coil 21, the end of the magnetic core 23 away from the screen 11 forms an N pole, and the end connected to the screen 11 forms an S pole. The S pole of the magnet 22 close to the screen 11 repels, and the N pole of the magnetic core 23 repels the N pole of the magnet 22 away from the screen 11, thereby driving the magnetic core 23 and the coil 21 to move downward, thereby pushing the screen 11 Move Downward. Conversely, when a current signal is passed into the coil 21 to make the end of the magnetic core 23 away from the screen 11 form an S pole, and the end connected to the screen 11 forms an N pole, the S pole of the magnetic core 23 will interact with the magnet 22 The N pole far away from the screen 11 attracts, and the N pole of the magnetic core 23 will attract the S pole of the magnet 22 close to the screen 11, thereby driving the magnetic core 23 and the coil 21 to move upward, thereby pulling the screen 11 to move upward. By repeatedly alternating the magnetic field direction of the magnetic core in this way, the screen can vibrate and sound relative to the fixing member.

Compared with the prior art, the screen vibration sound-generating device provided by the present invention can drive the screen vibration more directly and concisely. Taking the embodiment shown in FIG. 3 as an example, the magnetic core 23 and the magnet 22 are directly disposed on the screen 11 and the fixing member 12, respectively, which eliminates the housing, springs and other components compared with the prior art, reducing the product structure. the complexity. Moreover, the direct driving method 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 being subjected to the magnetic 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 magnet 22 is provided on the side of the coil 21 and the magnetic core 23, and 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.

Preferably, the driving assembly includes at least two magnets 22. A plurality of the magnets 22 are distributed around the magnetic core 23 in the form of center symmetry or rotational symmetry with respect to the axis of the magnetic core 23. The directions of the N pole and S pole of each magnet are the same. The advantage of this embodiment is that the magnet 22 can generate a magnetic force perpendicular to the surface of the screen 11 from each region and the magnetic core around the magnetic core 23. In this way, the magnetic force between the magnet and the magnetic core is balanced, and the relative tilt and offset caused by the imbalance of the two forces are reduced. As shown in FIGS. 3 and 4, the driving assembly includes two magnets 22, and the two magnets 22 are respectively located on the left and right sides of the magnetic core 23. In this way, the upward and downward magnetic forces on the left and right sides of the magnetic core 23 and the coil 21 are balanced, which weakens the problem of imbalanced forces on both sides. On the one hand, this preferred embodiment can improve the acoustic performance, and on the other hand, it is not easy to cause bending, deformation and other damage to the vibration component and the driving component.

Preferably, the magnet is a ring magnet, and the ring magnet is disposed around the magnetic core and the magnet. The axis of the ring magnet coincides with the axis of the magnetic core. Through this design, it is possible to maximize the uniformity of the magnetic core force.

Preferably, the driving assembly may further include a magnetic core ring, and the magnetic core ring is sleeved on the magnetic core. The magnetic core ring is made of a magnetically conductive material, and the magnetic core ring plays a concentrated role on the magnetic field generated by the magnetic core. For example, the magnetic core ring may be sleeved on the top or bottom of the magnetic core, so that the magnetic field generated by the magnetic core and the coil is concentrated around, thereby increasing the strength of the magnetic field between the magnetic core and the magnet, Increase the magnetic force generated between the two.

Preferably, as shown in the embodiments shown in FIGS. 3 and 4, the coil 21 is wound around the area of the magnetic core 23 close to the screen 11, and the magnetic core ring 24 is sleeved on the magnetic core 23 away from The area of the screen 11 is described. The magnetic core ring 24 is in contact with the coil 21, thereby improving the magnetic permeability of the magnetic core ring 24. On the one hand, the magnetic core ring 24 can enhance the strength of the magnetic field between the magnetic core 23 and the magnet 22. On the other hand, the magnetic core ring 24 can also concentrate the magnetic field generated by the magnet 22 to the area where the magnetic core 23 is located. The magnetic field generated by the magnet 22 can be introduced into the magnetic core 23. When the magnetic field passes through the magnetic core 23, a part of the magnetic field passes through the coil 21 in a direction parallel to the surface of the screen 11. When a current signal is passed into the coil 21, the magnetic field of the magnet 22 passes through the coil 21, so that an ampere force can be generated between the magnet 22 and the coil 21. That is, the relative driving force and vibration force between the magnetic core 23 and the magnet 22 can be strengthened by increasing the ampere force in addition to the above-mentioned magnetic force. Under the combined action of magnetic force and ampere force, the vibration sensitivity and amplitude of the screen relative to the fixed part can be strengthened, and the acoustic performance is significantly improved. By providing a magnetic core ring on the magnetic core, an ampere force can be generated between the magnet and the magnetic core, thereby enhancing the vibration effect.

The fixing member may be a plate-like structure having an opening 121 through which the magnetic core and the coil pass. Optionally, as shown in FIG. 3, the magnetic core 23 is disposed on the screen 11, and the magnet 22 is disposed on the fixing member 12. The fixing member 12 has an opening 121 at a position facing the magnetic core 23 and the coil 21. The magnet 22 may be disposed around the opening 121. The advantage of this design solution is that when the magnetic core and the magnet vibrate relatively, the end of the magnetic core can pass through the fixing member, thereby avoiding the fixing member from obstructing the vibration formation of the magnetic core. In this way, the distance between the screen and the fixing member can be set closer, which is more in line with the thin and light design of electronic products such as mobile phones.

Preferably, the driving assembly may further include a magnetic conductive plate, and the magnetic conductive plate may be attached to the magnet to form a convergent and concentrated effect on the magnetic field generated by the magnet. For example, in the embodiment shown in FIG. 3, a magnetic conductive plate 26 may be provided between the magnet 22 and the fixing member 12. By providing the magnetic conductive plate 26, the magnetic field generated by the magnet 22 can be concentrated in a direction closer to the magnetic core, thereby increasing the strength of the magnetic field and increasing the magnetic force generated between the magnet 22 and the magnetic core 23. The magnetic conducting plate 26 is preferably disposed on the side of the magnet 22 away from the magnetic core 23 or other surface not facing the magnetic core 23.

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 a magnetic force can be formed between the magnetic core 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 25 is attached to the inner surface of the screen 11, and the magnetic core and the coil are also fixedly connected to the inner surface of the screen 11.

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. As shown in FIG. 3, the magnet 22 is fixedly arranged on a part of the product body equivalent to the fixing member 12, and the magnetic core 23 is fixedly arranged on the screen 11. The magnetic force generated by the driving component 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. On the other hand, the design method of directly driving the screen vibration saves the shrapnel, shell and other parts, 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 magnetic core, a coil, and a magnet, the coil is wound on the magnetic core, the magnet is fixedly connected to one of the screen or the fixing member, and the magnetic core and the coil are A fixed connection of the screen and the fixing member that is not fixedly connected to the magnet;

The axis of the magnetic core is perpendicular to the surface of the screen, the magnet is located adjacent to the magnetic core in the radial direction of the magnetic core, and the magnetic pole direction of the magnet is perpendicular to the surface of the screen. The coil is configured to pass an alternating current signal to cause the magnetic core to generate magnetic poles perpendicular to the surface of the screen, thereby generating a direction perpendicular to the surface of the screen between the magnetic core and the magnet Magnetic force

The alternating current signal passing through the coil causes the magnetic poles generated by the magnetic core to alternately and reversely change, thereby to alternately and reversely change the direction of the magnetic force, and the vibration component is subjected to the alternating The magnetic force causes the screen to vibrate and sound relative to the fixture.
The screen vibration sound-generating device according to claim 1, wherein the driving assembly includes at least two pieces of the magnets, and each of the magnets is centrally or rotationally symmetrically arranged with respect to the axis of the magnetic core Around the magnetic core, the N pole and S pole of each magnet have the same direction.
The screen vibration sound generating device according to claim 1, wherein the magnet is a ring magnet, and the axis of the ring magnet coincides with the axis of the magnetic core.
The screen vibration sound generating device according to claim 1, wherein the driving assembly further comprises a magnetic core ring, and the magnetic core ring is sleeved on the magnetic core.
The screen vibration sound-generating device according to claim 4, wherein the coil is wound around an area where the magnetic core is close to the screen, and the magnetic core ring is sleeved on an area where the magnetic core is away from the screen , The magnetic core ring is in contact with the coil, the magnetic core ring is configured to concentrate the magnetic field generated by the magnet onto the magnetic core so that the magnetic field passes through in a direction parallel to the surface of the screen In the coil, when a current signal is passed into the coil, an ampere force can be generated between the coil and the magnet.
The screen vibration sound-generating device according to claim 1, wherein the fixing member is provided with an opening at a position directly facing the magnetic core, the opening is provided for inserting the magnetic core therein, the magnet It is arranged at a position around the opening.
The screen vibration sound-generating device according to claim 1, wherein the driving assembly further comprises a magnetic conducting plate, and the magnetic conducting plate is sandwiched between the magnet and the vibration assembly connected thereto.
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.
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.