CN109842701B - Screen vibration sounding device and electronic product - Google Patents
Screen vibration sounding device and electronic product Download PDFInfo
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- CN109842701B CN109842701B CN201811585132.XA CN201811585132A CN109842701B CN 109842701 B CN109842701 B CN 109842701B CN 201811585132 A CN201811585132 A CN 201811585132A CN 109842701 B CN109842701 B CN 109842701B
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- 230000001681 protective effect Effects 0.000 claims abstract description 61
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
Abstract
The invention discloses a screen vibration sounding device and an electronic product. This screen vibration sound generating device includes: a vibration assembly including a screen and a fixture, the screen configured to be capable of vibrating relative to the fixture; the driving assembly comprises at least one coil, at least one magnet, a protective shell and an elastic sheet, wherein the coil is fixedly connected with one of the screen or the fixing piece, the magnet is fixed in the protective shell, the protective shell is fixedly connected with one of the screen and the fixing piece, which is not fixedly connected with the coil, and the elastic sheet is connected between the protective shell and the vibration assembly fixed by the coil; the vibration assembly is subjected to alternating ampere forces transmitted by the drive assembly to vibrationally sound the screen relative to the mount, and the spring is configured to provide a cushioning and return force between the protective housing and the vibration assembly to which the coil is secured.
Description
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
Sound emitting devices are important electroacoustic transducing elements in electronic products for converting current signals into sound. With the rapid development of electronic products in recent years, sound generating devices applied to the electronic products are correspondingly improved.
The traditional sounding device for a mobile phone receiver adopts the principle that a vibrating diaphragm pushes air to vibrate for sounding. Recently, as the comprehensive screen becomes the main development direction of the mobile phone, how to realize the function of the earphone under the design of no opening of the screen, and meanwhile, the mobile phone has better hearing experience is a technical problem facing the current. In this regard, those skilled in the art have developed a technical solution for sounding by screen vibration.
One technical scheme adopted by the person skilled in the art is shown in fig. 1, and the technical scheme adopts a structural distribution mode that an electromagnet 02 and a magnet 03 are oppositely arranged, and the electromagnet 02 and the magnet 03 generate variable adsorption and rejection effects by opening and closing the electromagnet 02 or switching magnetic poles of the electromagnet 02. Then, the magnet 03 is fixed on the mobile phone screen 01, and the electromagnet 02 is fixed on a part which is fixed in the mobile phone, so that the mobile phone screen 01 can vibrate.
In this solution, assuming that the vertical displacement is x, an attractive force is provided between the two magnets, and a force F (x) is provided between the first magnet and the second magnet in relation to the displacement. The restoring force of the rigidity of the screen is F (kmsx), and the state of force balance exists at the momentAfter the coil of the electromagnet 02 is energized, the magnetic field between the two magnets is disturbed, so that the forces between the electromagnet 02 and the magnet 03 are balanced, for example: because the current enhances the attractive magnetic field in the same direction, the two magnets have a tendency to approach each other, and the screen has a reverse restoring force and a damping force during movement, so the equation of motion is:
wherein B is equivalent magnetic induction intensity, H is equivalent magnetic field intensity, and S is equivalent area of interaction between two permanent magnets.
However, the technical scheme also has the problem of larger occupied space, which is unfavorable for the light and thin structural design of the mobile phone. On the premise of generating enough amplitude for the mobile phone screen 01, enough space needs to be reserved between the two magnets, otherwise collision between the magnets and the electromagnet 02 can be caused, and the acoustic performance of screen sounding is seriously affected. For this reason, more space must be occupied in the thickness direction of the mobile phone. In addition, the directions of the acting forces of mutual attraction and repulsion between the magnets are influenced by the axial direction of the coil and the magnetic pole directions of the magnets, and even the tiny deviation of the magnetic poles can cause the acting forces received by the two magnets to be not perpendicular to the direction of the screen, so that the screen is easy to damage in vibration.
Disclosure of Invention
The invention aims to provide a novel technical scheme for screen vibration sounding.
According to a first aspect of the present invention, there is provided a screen vibration sound generating apparatus comprising:
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, at least one magnet, a protective shell and an elastic piece, wherein a through hole is formed in the middle of the coil, a wiring area of the coil is formed around the through hole, the coil is fixedly connected with one of the screen or the fixing piece, the magnet is fixed in the protective shell, the protective shell is fixedly connected with one of the screen and the fixing piece which is not fixedly connected with the coil, and the elastic piece is connected between the protective shell and the vibration assembly fixed by the coil;
the coil is in a vertical posture relative to the screen, the protective shell is provided with a through hole, the coil stretches into the protective shell from the through hole, the magnet is positioned on one side of the coil, the annular end face of the coil faces the magnet, the wiring area penetrates through a magnetic field generated by the magnet, the coil is configured to be capable of being electrified with an alternating current signal, the electrified wiring area penetrates through the magnetic field generated by the magnet, and an ampere force with the direction perpendicular to the surface of the screen is generated between the coil and the magnet;
the alternating current signal passing through the coil causes the direction of the ampere force to alternately and inversely change, the vibration assembly is subjected to alternating ampere force transmitted by the driving assembly so as to make the screen vibrate and sound relative to the fixed piece, and the elastic sheet is configured to provide buffering and resetting acting force between the protective shell and the vibration assembly fixed by the coil.
Optionally, the driving assembly is configured to set two magnets corresponding to one coil, the two magnets are respectively located at positions located at two sides of the through hole in the protective shell, the coil is located between the two magnets, two annular end faces of the coil face towards 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: n is very close to the screen, S is very far away from the screen;
the magnetic pole direction of the other magnet is as follows: n is far away from the screen, S is very close to the screen;
the wiring area comprises a first wiring area close to the screen and a second wiring area far away from the screen, and the wiring directions of the first wiring area and the second wiring area are parallel to the surface of the screen;
a magnetic field is formed between the magnetic poles of the two magnets, which are close to the screen, and the first wiring area passes 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 passes through the magnetic field.
Optionally, the magnet adopts halbach magnet, and a side of the magnet close to the coil corresponds to a side of the halbach magnet with enhanced magnetic field.
Optionally, the elastic sheet comprises a fixing plate and at least two cantilevers, the fixing plate is fixed on one part of the vibration assembly, the cantilevers extend out of the fixing plate, and one end, far away from the fixing plate, of each cantilever is connected to the outer surface of the protective shell.
Optionally, the fixing plate is attached to the inner surface of the screen, four cantilevers extend out of the fixing plate, and ends of the four cantilevers are connected to the surface of the fixing plate facing the screen.
Optionally, the driving assembly includes a circuit board, the circuit board is attached to a surface of the fixing board, which is far away from the screen, and the coil is disposed on the circuit board and is electrically connected with the circuit board.
Optionally, the protective housing is connected on the mounting, the opening has been seted up on the mounting, the protective housing is arranged in the opening, fixedly connected with support on the lateral wall of protective housing, the support extends to in the opening the surface of mounting that deviates from or is directed towards the screen, the support with mounting fixed connection.
According to another aspect of the present invention, there is also provided an electronic product including:
the screen vibration sounding device;
the screen is arranged on the product main body, the fixing piece is a part of structure of the product main body, and the driving assembly is arranged in the product main body.
Optionally, the fixing element is a middle frame or a side wall in the product main body.
According to one embodiment of the present disclosure, the risk of damaging the screen can be reduced.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, 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 on-screen sound production solution;
FIG. 2 is an exploded view of the drive assembly of the screen vibration sound emitting device provided by the present invention;
FIG. 3 is a schematic side sectional view of a screen vibration sound emitting device provided by the present invention;
FIG. 4 is a schematic side cross-sectional view of another screen vibration sound emitting device provided by the present invention;
FIG. 5 is a schematic side cross-sectional view of another screen vibration sound emitting device provided by the present invention;
fig. 6 is a schematic side sectional view of another 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 accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one 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 specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The invention provides a screen vibration sounding device, which comprises a vibration component and a driving component. As shown in fig. 2 and 3, the vibration assembly includes a screen 11 and a fixture 12, the screen 11 being configured to vibrate with respect to the fixture 12. The fixing member 12 may be a certain fixing member in the electronic apparatus to which the sound generating apparatus is applied, or may be a separately configured fixing member. The driving assembly comprises at least one coil 21, at least one magnet 22, a protective shell 23 and a spring plate 24. The coil 21 is wound by a wire in a closed annular structure along one direction, the center of the coil 21 is provided with a through hole, and the periphery of the through hole is a wiring area of the coil 21. 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 fixedly provided in the protective case 23. The protective case 23 is fixed to one of the screen 11 or the fixing member 12 where the coil 21 is not provided. In the embodiment shown in fig. 2 and 3, the coil 21 forms a fixed connection with the screen 11, while the protective housing 23 and the magnet 22 form a fixed connection with the mount 12. In other embodiments, the protective housing may be fixedly connected to the screen, and the coil may be fixedly connected to the fixing member.
The spring 24 is then connected between the protective shell 23 and the part of the vibrating assembly to which the coil 21 is fixed. Taking the embodiment shown in fig. 3 as an example, the elastic sheet 24 is connected between the screen 11 and the protective case 23. In other embodiments, the elastic piece may be connected between the fixing piece and the protective shell. The elastic sheet can provide a buffer effect between the protective shell and a part of another vibration assembly, and can also provide a reset acting force for reset after screen vibration. The risk of damage to the screen and incorrect resetting of the screen is reduced.
The coil 21 itself, which is in the shape of a closed loop, has an 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 protective shell 23 is provided with a through opening 231, and the coil 21 can extend into the protective shell 23 from the through opening 231. So that the magnet 22 is located on one side of the coil 21, the annular end face of the coil 21 faces the magnet 22, and the axis of the coil 21 and the surface of the screen 11 are both in a horizontal posture. The routing area of the coil 21 comprises a first routing area 211 close to the screen and a second routing area 212 remote from the screen. The first and second routing areas 211, 212 are routed in a direction parallel to the surface of the screen, in the form of routing inwards and outwards along the page in the embodiment shown in fig. 3, 4. The magnet 22 is capable of generating a magnetic field, and at least one of the first trace region 211 and the second trace region 212 is configured to pass through the magnetic field generated by the magnet 22. In this way, 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 area passes through the magnetic field and can generate an ampere force. Since the magnet 22 is provided at the side of the coil 21, a part of the magnetic field generated by the magnet 22 can pass through the coil 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 which is introduced into the coil is an alternating signal, the direction of the generated ampere force is alternately and reversely changed. Ampere force can be transferred directly to the screen through the drive assembly. As shown in fig. 3, the coil 21 can directly drive the screen 11 after receiving an ampere force. The ampere force can cause the relative displacement between the screen and the fixing piece, so that the screen can vibrate and sound relative to the fixing piece.
Compared with the prior art, the screen vibration sounding device provided by the invention can directly drive the screen to vibrate, and can better protect the screen and reduce the risk of screen damage. Taking the embodiment shown in fig. 3 as an example, the coil 21 and the magnet 22 are respectively and directly arranged on the screen 11 and the fixing member 12, and directly drive the screen 11, thereby ensuring high-efficiency vibration transmission efficiency. The direct drive mode of directly connecting the drive assembly with the vibration assembly 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 vibration is not required to be caused to resonate through vibrator vibration so as to drive the screen to vibrate. The design enables the amplitude generated by the screen to be basically consistent with the amplitude generated by the driving component, and the space reserved for the driving component 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 drive assembly that is significantly larger than the maximum amplitude of the screen. On the other hand, the elastic sheet 24 is connected between the protective shell 23 and the screen, and when the magnet 22 interacts with the coil 21 to drive the screen 11 to vibrate, the elastic sheet 24 can generate damping and buffering effects to buffer the impact force received by the screen 1, so that the screen is prevented from being damaged by the frequently-changed ampere force. In addition, under the condition that the screen is made of a material which is softer, better in deformability and relatively poorer in elastic resilience, the elastic sheet can provide restoring force for the screen, so that the screen returns to the initial balance position after each vibration action is completed. Thus, the service life of the screen can be prolonged, and the acoustic performance of the sound generating device can be improved.
Preferably, the drive assembly is configured in the form of two magnets 22 arranged corresponding to one coil 21, as shown in fig. 3, 4. The two magnets 22 are respectively located at two sides of the coil 21 along the axial direction of the coil 21, the coil 21 is clamped between the two magnets 22, and two annular end faces of the coil 21 face the two magnets 22 respectively. A magnetic field is formed between the two magnets 22 through which the first and second trace areas 211, 212 of the coil 21 can pass, thereby generating an ampere force between the magnets 22 and the coil 21. The magnetic field stability, symmetry and magnetic field intensity generated by the two magnets are better, so that the ampere force generated between the coil and the magnets is stronger, the direction of the ampere force is difficult to incline, and the like, and the vibration effect of the screen is more stable. In addition, by arranging two magnets, the magnetic field formed between the two magnets is more concentrated and stronger than the magnetic field formed on the side close to the coil of one magnet, and the magnetic field generated by the magnets is effectively utilized.
In the embodiment shown in fig. 3 and 4, the portion capable of causing the coil 21 to generate an ampere force that moves upward or downward is the upper and lower two-stage routing regions of the coil 21. Therefore, in order to improve the magnetic field utilization rate, the magnetic field should be penetrated through the two sections of wiring areas as much as possible.
As shown in fig. 3, the present invention provides a preferred implementation of the magnetic circuit distribution when two magnets 22 are used. For the magnets located on the left, their N poles are far from the screen 11, i.e. the N poles are facing upwards; with S very close to the screen 11, i.e. with the S level directed downwards. For the magnets located on the right, their N poles are close to the screen 11, i.e. the N poles are facing downwards; with S pole far from the screen 11, i.e. S pole facing upwards. In this arrangement of magnets, a magnetic field can be formed between the poles of the two magnets 22 close to the screen 11, for example a magnetic field extending from the lower right N-pole to the lower left S-pole, through which the first routing area 211 passes. A magnetic field can be formed between the poles of the two magnets 22 remote 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 212 passes. In this way, the magnetic field is passed through both sections of the trace area of the coil 21 that are effective to generate an ampere force for vibration, and the direction of the magnetic field is substantially perpendicular to the direction of the current in the coil 21, resulting in a higher efficiency of conversion into an ampere force. Further, the directions of magnetic fields passing through the upper and lower sections of wiring areas are opposite, and the directions of currents in the upper and lower sections of wiring areas are also opposite, so that the directions of ampere forces generated in the upper and lower sections of wiring areas 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 embodiments where only one magnet is used in conjunction with the coil to generate an ampere force, the magnets preferably have a pole distribution in which one pole is closer to the screen and the other pole is farther from the screen. In this way, the directions of the magnetic fields passing through the upper and lower wiring areas can be reversed, the utilization rate of the wiring area of the coil can be improved, and the generated ampere force can be improved.
The present invention does not exclude an embodiment in which the poles of the magnet are disposed toward the coil. The magnetic poles of the magnet are directed to the coil and aligned with one of the upper and lower end routing regions of the coil, and an appropriate ampere force can be generated between the coil and the magnet to drive vibration.
Taking the embodiment shown in fig. 3 and 4 as an example, when the screen 11 is in a rest position with respect to the fixed member 12, the first routing area 211 of the coil 21 is positioned in a direction perpendicular to the surface of the screen 11, corresponding to the positions of the two magnets 22 close to the poles of the screen 11. Accordingly, the position of the second routing area 212 in this direction corresponds to the position of the poles of the two magnets away from the screen 11. Thus, the two wiring areas respectively pass through the magnetic fields parallel to the surface of the screen, which are formed between the two pairs of magnetic poles of the two magnets.
After the current signal is applied to the coil 21, for example, the first signal is applied in a direction from the inside of the paper to the outside of the paper in the first wiring region 211, and in a direction from the outside of the paper to the inside of the paper in the second wiring region 212. 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 near the screen 11 are propagated from the right N pole to the left S pole, and downward ampere force is generated according to the left hand rule of ampere force. The magnetic fields of the two magnets 22 away from the screen 11 propagate from the left N pole to the right S pole, generating a downward amperage force according to the left hand rule of amperage force. The coil 21 directly pushes the screen 11 to move downward after receiving an ampere force.
Due to the alternating signal introduced into the coil, the signal is then inverted, the direction of the signal in the first trace region 211 is from outside the page to inside the page, and the direction in the second trace region 212 is from inside the page to outside the page. The two trace areas produce upward amperage force according to the left-right rule of amperage force. The coil 21 directly pulls the screen upward after receiving an ampere force.
Through the principle, the driving assembly achieves the effect of directly driving the screen to vibrate.
The present invention provides three specific forms of connection between the protective shell and the fixture as shown in fig. 3-5. The fixing member 12 may be a plate-like structure having an opening 121. In the embodiment shown in fig. 3, an opening 121 is provided in which the protective housing 23 is disposed, and the protective housing 23 is fixed to the inner side wall of the opening 121. The design scheme has the advantages that the space occupied by the protective shell and the magnet in the screen vibration direction is smaller, and part of the thickness of the protective shell and the magnet overlaps with the fixing piece, so that the design scheme is more in line with the light and thin design of electronic products such as mobile phones.
As shown in fig. 4, the fixing member 12 may be a plate-like structure or an inner surface of a housing of an electronic product, and the protective case 23 is directly fixed to a lower surface of the fixing member 12. The fixing member 12 still has an opening 121, and the opening 231 of the protecting case 23 extends from the lower wall to the upper wall of the protecting case 23. The coil 21 can extend from a lower opening of the protective housing 23 and from an upper opening. Further, a small portion of the structure of the coil 21 can extend into the opening 121 of the mount 12. The design has the advantages that the connection reliability of the protective shell and the fixing piece is higher, the magnet is not easy to shake or loose, and the screen vibration can be driven by ampere force more efficiently. Also, by providing the opening 121 on the fixing member 12, the space occupied by the driving assembly in the vibration direction parallel to the screen is reduced as much as possible.
As shown in fig. 5, the drive assembly further comprises a bracket 26, said bracket 26 being used for fixing the protective housing 23 to said mount 12. The fixing member is provided with an opening 121, and the protective shell 23 is disposed in the opening 121. The side wall of the protective shell 23 does not take the form of a direct connection to the inner side wall of the opening 121 as shown in fig. 3. The support 26 is fixedly connected to the side wall of the protective housing 23, and the support 26 extends from the opening 121 to the surface of the fastening element 12 facing away from or toward the screen 11. In the embodiment shown in fig. 5, the bracket 26 extends to and is fixedly attached to the surface of the fixing element 12 facing away from the screen 11. The protective housing 23 is thereby fixedly connected in the opening 121 by means of the bracket 26. The advantage of this embodiment is that, on the one hand, the space taken up by the protective shell in the direction parallel to the screen vibrations can be reduced, and, on the other hand, the assembly process of the protective shell with the fixing element can be simplified. The support and the fixing piece have larger contact area, and the contact surface faces towards or deviates from the screen, so that the fixed connection is easier to realize. For example by means of adhesive or screw connection, riveting. The difficulty of the fixed connection is significantly reduced compared to fixedly connecting the side wall of the protective housing with the side wall of the opening. The support can also be fixedly connected with the protective housing in a bonding, threaded connection and riveting mode. Alternatively, the cross-section of the bracket 26 may be L-shaped.
Preferably, as shown in fig. 6, the magnet 22 is a halbach magnet. Halbach magnets have the feature of strengthening the magnetic field on one side of the magnet and weakening the magnetic field on the other side of the magnet. In the embodiment of the present invention, the side of the magnet 22 close to the coil 21 corresponds to the side of the halbach magnet where the magnetic field is enhanced. The halbach magnet enhances the magnetic field significantly and, in a position close to the halbach magnet, the magnetic field is able to radiate outwardly in a direction approximately perpendicular to the side walls of the magnet 22. Depending on the degree of magnetization of the magnets employed, it is even possible to make its magnetic field strength and magnetic field utilization exceed those of 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. It is preferable to use halbach magnets on both sides of the coil 21 as shown in fig. 6.
The invention provides a magnetic pole distribution mode of halbach magnets. As shown in fig. 6, the halbach magnet includes three magnets, which are stacked in order from top to bottom. Wherein the poles of the two magnets of the top and bottom layers face the sides of the halbach magnets, i.e. towards or away from the coil 21, and the poles of the magnets of the middle layer face the two magnets of the upper and lower layers. On the side close to the coil 21, that is, on the side where the magnetic field of the halbach magnet is intensified, 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 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 the same polarity. In the embodiment shown in fig. 6, taking the left magnet as an example, 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. In this way, a strong magnetic field is formed on the right side of the halbach magnet. The magnetic induction line radiated from the N pole of the upper magnet is repelled by the N pole of the middle magnet, and only the rightward radiation is concentrated. Further, the S pole of the lower magnet receives the magnetic induction line emitted from the N pole, and the S pole is repelled by the S pole of the middle magnet, so that the magnetic induction line can only be concentrated and transmitted back to the S pole of the lower magnet from the right side of the lower magnet. Under the action of such a combined magnet, the magnetic induction lines on the right side of the magnet 22 are more concentrated, and the direction is substantially perpendicular to the side wall of the magnet 22, i.e., perpendicular to the running 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 opposite to a magnetic pole of the halbach magnet 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. 6, the second routing region 212 of the coil 21 corresponds to the position of the N pole of the upper magnet, and the first routing region 211 of the coil 21 corresponds to the position of the S pole of the lower magnet. The routing area of the coil 21 corresponds to the position of the magnetic pole accurately, and the utilization rate of the magnetic field can be improved.
The invention provides an embodiment of the preferred structure of the spring. As shown in fig. 2, the elastic sheet 24 may include a fixing plate 241 and at least two cantilever arms 242. The fixing plate 241 is fixed to one of the components of the vibration assembly, and the cantilever 242 is extended from the fixing plate 241, and an end of the cantilever 242 remote from the fixing plate 241 is coupled to the outer surface of the protective case 23. In the embodiment shown in fig. 3, the fixing plate 241 is fixedly covered on the inner surface of the screen 11. The cantilever 242 is extended from the fixing plate 241 and is upwardly coupled to the lower surface of the protective case 23. In another embodiment, the fixing plate may be fixed on the fixing member, and the end of the cantilever is connected to the inner surface of the screen, which also has the effect of buffering and providing a restoring force.
Preferably, as shown in fig. 2, four cantilevers extend from the fixing plate, and ends of the four cantilevers are connected to a surface of the fixing plate facing the screen. The supporting acting force provided by the four cantilevers is more balanced and balanced, so that the screen can be subjected to more stable and balanced buffer action. Further reducing the possibility of polarization and other phenomena.
Alternatively, the screen driven sound emitting device may comprise at least two sets of drive assemblies. Corresponding to a set of vibration subassembly, can dispose two sets of drive assembly in the different positions of screen at least, this kind of embodiment makes the ampere force that produces between screen and the mounting more balanced, and the screen produces the vibration under even ampere force effect, and vibration stability is better, the screen is not fragile to acoustic properties is better.
Optionally, as shown in fig. 2 and 3, the driving assembly further includes a circuit board 25. The circuit board 25 is electrically connected to the coil 21 for transmitting an electrical signal to enable an ampere force to be formed between the coil 21 and the magnet 22. The circuit board 25 is preferably provided on the same component of the vibration assembly as the coil 21. As shown in fig. 2 and 3, the circuit board 25 is attached to the fixing plate 241 of the spring plate 24. The coil 21 is also fixedly connected to the fixing plate 241. In other embodiments, the circuit board may be attached to the inner surface of the screen.
The invention also provides an electronic product. The electronic product comprises the screen vibration sounding device and a product main body. The electronic product may be a mobile phone or a tablet computer, and the invention is not limited thereto. The screen is arranged on the product main body and is used as a display screen of the electronic product. The screen can be rotatably connected to the product main body at one end and can be freely moved at the other end; alternatively, the screen may be made of a material having a good elastic deformability, and may be provided in such a manner that one end is fixedly connected to other fixed members and the other end is freely movable. In this way, the screen is able to vibrate with respect to the product body. A portion of the structure of the product body may be used as the securing member, and the drive assembly is disposed within the product body. For example, the protective shell and the magnet are fixedly arranged on a part of the product main body, which corresponds to the fixing piece, and the coil is fixedly arranged on the screen. The elastic sheet is connected between the fixed plate and the screen. The screen can be driven to vibrate and sound through the ampere force generated by the driving assembly. The screen vibration sounding device provided by the invention is adopted in the electronic product, so that the occupied space of the electronic product in the thickness direction parallel to the screen is less, the electronic product is more beneficial to being designed thinner, and the design requirement of the electronic product for being light and thin is met.
Preferably, the fixing member may be a middle frame, a side wall or the like in the product main body. In order to accommodate other electronic devices, the product body is often provided with structural components such as partitions, middle frames, etc., which have good structural stability in the electronic product, on the one hand for the case electronics and on the other hand for protecting the electronics. Therefore, the structural member in the main body of the product is used as the fixing member, so that the conversion rate of ampere force into vibration can be improved, and the vibration reliability can be improved. The inner surface of the side wall of the product body may also act as the securing member.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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 (10)
1. A screen vibration sounding apparatus, comprising:
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, at least one magnet, a protective shell and an elastic piece, wherein a through hole is formed in the middle of the coil, a wiring area of the coil is formed around the through hole, the coil is fixedly connected with one of the screen or the fixing piece, the magnet is fixed in the protective shell, the protective shell is fixedly connected with one of the screen and the fixing piece which is not fixedly connected with the coil, and the elastic piece is connected between the protective shell and the vibration assembly fixed by the coil;
the coil is in a vertical posture relative to the screen, the protective shell is provided with a through hole, the coil stretches into the protective shell from the through hole, the magnet is positioned on one side of the coil, the annular end face of the coil faces the magnet, the wiring area penetrates through a magnetic field generated by the magnet, the coil is configured to be capable of being electrified with an alternating current signal, the electrified wiring area penetrates through the magnetic field generated by the magnet, and an ampere force with the direction perpendicular to the surface of the screen is generated between the coil and the magnet;
alternating current signals passing through the coil enable the direction of the ampere force to be alternately and reversely changed, the vibration assembly is subjected to alternating ampere force transmitted by the driving assembly to enable the screen to vibrate and sound relative to the fixed piece, and the elastic sheet is configured to provide buffering and resetting acting force between the protective shell and the vibration assembly fixed by the coil;
the wire-routing area of the coil comprises a first wire-routing area close to the screen and a second wire-routing area far away from the screen, the wire-routing directions of the first wire-routing area and the second wire-routing area are parallel to the surface of the screen, and at least one of the first wire-routing area and the second wire-routing area passes through a magnetic field generated by the magnet.
2. The screen vibration and sound device according to claim 1, wherein the driving assembly is configured to provide two magnets corresponding to one coil, the two magnets are respectively located at positions on two sides of the through hole in the protective housing, the coil is located between the two magnets, two annular end faces of the coil face the two magnets respectively, and a magnetic field is formed between the two magnets.
3. The screen vibration and sound device according to claim 2, wherein the magnetic pole direction of one of the magnets is: n is very close to the screen, S is very far away from the screen;
the magnetic pole direction of the other magnet is as follows: n is far away from the screen, S is very close to the screen;
a magnetic field is formed between the magnetic poles of the two magnets, which are close to the screen, and the first wiring area passes 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 passes through the magnetic field.
4. The screen vibration and sound device 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 and sound device as claimed in claim 1, wherein the spring plate includes a fixing plate fixed to one of the components of the vibration assembly and at least two cantilevers extending from the fixing plate, and one ends of the cantilevers remote from the fixing plate are connected to the outer surface of the protective case.
6. The screen vibration and sound device according to claim 5, wherein the fixing plate is attached to the inner surface of the screen, four cantilevers are extended from the fixing plate, and the ends of the four cantilevers are connected to the surface of the fixing plate facing the screen.
7. The screen vibration and sound device as claimed in claim 5, wherein the driving assembly includes a circuit board attached to a surface of the fixing plate facing away from the screen, and the coil is disposed on and electrically connected to the circuit board.
8. The screen vibration and sound device according to claim 1, wherein the protective shell is connected to the fixing member, an opening is formed in the fixing member, the protective shell is placed in the opening, a bracket is fixedly connected to a side wall of the protective shell, and extends from the opening to a surface of the fixing member facing away from or toward the screen, and the bracket is fixedly connected to the fixing member.
9. An electronic product, comprising:
a screen vibration sound generating apparatus according to any one of claims 1 to 7;
the screen is arranged on the product main body, the fixing piece is a part of structure of the product main body, and the driving assembly is arranged in the product main body.
10. The electronic product of claim 9, wherein the fixing member is a middle frame or a side wall in the product body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811585132.XA CN109842701B (en) | 2018-12-24 | 2018-12-24 | Screen vibration sounding device and electronic product |
| PCT/CN2019/127238 WO2020135281A1 (en) | 2018-12-24 | 2019-12-21 | Screen vibration sound production apparatus and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811585132.XA CN109842701B (en) | 2018-12-24 | 2018-12-24 | Screen vibration sounding device and electronic product |
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| Publication Number | Publication Date |
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| CN109842701A CN109842701A (en) | 2019-06-04 |
| CN109842701B true CN109842701B (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811585132.XA Active CN109842701B (en) | 2018-12-24 | 2018-12-24 | Screen vibration sounding device and electronic product |
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| CN (1) | CN109842701B (en) |
| WO (1) | WO2020135281A1 (en) |
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| CN109842701B (en) * | 2018-12-24 | 2023-11-17 | 歌尔股份有限公司 | Screen vibration sounding device and electronic product |
| CN110113696B (en) * | 2019-04-23 | 2020-10-09 | 歌尔股份有限公司 | Vibration sound production device and electronic product |
| CN110267170B (en) * | 2019-06-12 | 2020-11-20 | 瑞声科技（南京）有限公司 | Screen sounding device |
| CN110166904B (en) * | 2019-06-12 | 2020-08-18 | 瑞声科技（南京）有限公司 | Screen sounding device |
| CN110290245B (en) * | 2019-06-26 | 2020-09-11 | 维沃移动通信有限公司 | Mobile terminal |
| CN112148067B (en) | 2019-06-27 | 2022-09-02 | 北京小米移动软件有限公司 | Screen component and mobile terminal |
| CN110310616B (en) * | 2019-06-28 | 2023-06-06 | Oppo广东移动通信有限公司 | Sound generating device, display device and terminal |
| CN112188370A (en) * | 2019-07-02 | 2021-01-05 | 中兴通讯股份有限公司 | Mobile terminal and sound production control method thereof |
| CN111065026A (en) * | 2019-11-25 | 2020-04-24 | 瑞声科技(新加坡)有限公司 | Screen sounder and electronic equipment applying same |
| CN110828158A (en) * | 2019-11-29 | 2020-02-21 | 重庆华渝电气集团有限公司 | Method for releasing coil winding stress |
| CN110896267B (en) * | 2019-12-02 | 2021-07-09 | 歌尔股份有限公司 | Vibration exciter for electronic product and electronic product |
| CN110933566B (en) * | 2019-12-02 | 2022-03-18 | 歌尔股份有限公司 | Vibration sounding device for electronic product and electronic product |
| CN111225324B (en) * | 2019-12-07 | 2022-06-10 | 歌尔股份有限公司 | Vibration sounding device for electronic product and electronic product |
| CN111405396B (en) * | 2020-03-23 | 2022-04-12 | 维沃移动通信有限公司 | Electromagnetic actuator and electronic device |
| CN111862818B (en) * | 2020-07-31 | 2022-11-25 | 京东方科技集团股份有限公司 | Display module, display device and preparation method |
| CN113589922B (en) * | 2021-06-17 | 2024-03-01 | 汉得利（常州）电子股份有限公司 | Haptic actuator with large-stroke spring plate structure |
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Also Published As
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| WO2020135281A1 (en) | 2020-07-02 |
| CN109842701A (en) | 2019-06-04 |
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