CN212519424U - Screen vibration sound production device - Google Patents
Screen vibration sound production device Download PDFInfo
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- CN212519424U CN212519424U CN202021530526.8U CN202021530526U CN212519424U CN 212519424 U CN212519424 U CN 212519424U CN 202021530526 U CN202021530526 U CN 202021530526U CN 212519424 U CN212519424 U CN 212519424U
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Abstract
The utility model relates to a screen vibration sound production technical field especially relates to a screen vibration sound generating mechanism, and it includes: a central magnet; a ring magnet assembly surrounding the center magnet, the ring magnet assembly having a length in an axial direction of the center magnet that is less than a length of the center magnet; a coil at least partially surrounding the outside of the center magnet and spaced from the ring magnet assembly in an axial direction of the center magnet; a screen, one of the central magnet, the ring magnet assembly and the coil being fixedly connected to the screen. The central magnet is magnetized along the axial direction of the central magnet, and the annular magnet assemblies point to the center along the radial direction of the annular magnet assemblies; compare in the magnetic circuit drive efficiency that central magnet and annular magnet subassembly formed under the same volume of traditional structure are high, and in great displacement range, undulant less.
Description
Technical Field
The utility model relates to a screen vibration sound production technical field especially relates to a screen vibration sound generating mechanism.
Background
The linear motor is used for driving the whole mobile phone screen to vibrate and pushing air to sound, so that a receiver can be replaced, and the whole thickness of the mobile phone can be smaller. In order to make the frequency response flat and maintain sufficient loudness in the whole frequency band, the electromagnetic driving efficiency (BL) of the device is required to be high; furthermore, in order to ensure the degree of distortion, it is necessary to maintain the flatness of the BL within a certain displacement range.
The structure used at present is a traditional three-magnetic-circuit structure, the directions of the magnetic steels in the middle and on two sides are opposite, but the magnetic circuit structure has lower electromagnetic driving efficiency, and BL is obviously reduced when the displacement exceeds +/-0.3 mm.
Therefore, a screen vibration sound generating device is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a screen vibration sound generating mechanism compares in the magnetic circuit drive efficiency height that central magnet and annular magnet subassembly formed under traditional structure is with the volume, and in great displacement range, undulant less.
To achieve the purpose, the utility model adopts the following technical proposal:
provided is a screen vibration sound generating device including:
a central magnet;
a ring magnet assembly surrounding the center magnet, the ring magnet assembly having a length in an axial direction of the center magnet that is less than a length of the center magnet;
a coil at least partially surrounding the outside of the center magnet and spaced from the ring magnet assembly in an axial direction of the center magnet;
a screen, one of the central magnet, the ring magnet assembly and the coil being fixedly connected to the screen.
As an optimal technical scheme of the screen vibration sound production device, the annular magnet assembly is formed by splicing a plurality of magnetic blocks.
As a preferred technical scheme of the screen vibration sound production device, the screen vibration sound production device further comprises a pole core which covers one end, close to the coil, of the central magnet.
As a screen vibration sound generating mechanism's preferred technical scheme, still include the magnetism bowl, central magnet with the annular magnet subassembly all set up in the magnetism bowl, the coil is at least partly located in the magnetism bowl.
As a preferred technical scheme of screen vibration sound generating mechanism, still include the pole piece, it cover in keeping away from of magnetism bowl one end of coil is last, central magnet with the annular magnet subassembly is kept away from the one end of coil is by the pole piece covers.
As an optimal technical scheme of the screen vibration sound production device, the pole core, the magnetic bowl and the pole piece are all made of magnetic materials.
As a preferred technical scheme of screen vibration sound generating mechanism, still include FPC, the coil is kept away from the one end of annular magnet subassembly is fixed on FPC, the coil with FPC electricity is connected.
As a preferred technical scheme of screen vibration sound generating device, still include the backup pad, FPC sets up in the backup pad.
As a preferred technical scheme of screen vibration sound generating device, still include the screen, the pole piece or the backup pad is fixed the laminating is in the back of screen.
The utility model has the advantages that:
the central magnet is magnetized along the axial direction of the central magnet, and the annular magnet assemblies point to the center along the radial direction of the annular magnet assemblies; compare in the magnetic circuit drive efficiency that central magnet and annular magnet subassembly formed under the same volume of traditional structure are high, and in great displacement range, undulant less.
Drawings
Fig. 1 is a schematic structural diagram of a screen vibration sound-producing device provided by the present invention;
fig. 2 is a cross-sectional view of the screen vibration sound generating device provided by the present invention;
fig. 3 is an exploded view of the screen vibration sound generating device provided by the present invention;
fig. 4 is a schematic structural diagram of the screen vibration sound-generating device provided by the present invention (the pole piece is attached to the back of the screen).
In the figure: 1. a central magnet; 2. a ring magnet assembly; 21. a magnetic block; 3. a coil; 4. a pole piece; 5. a magnetic bowl; 6. pole pieces; 7. FPC; 8. a support plate; 9. and (6) a screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 3, the present embodiment discloses a screen vibration sound generating apparatus including a center magnet 1, a ring-shaped magnet assembly 2, a coil 3, and a screen. The annular magnet assembly 2 surrounds the central magnet 1 in a sleeved mode, and the length of the annular magnet assembly 2 along the axial direction of the central magnet 1 is smaller than that of the central magnet 1. The coil 3 at least partially surrounds the central magnet 1 and is spaced from the ring magnet assembly 2 in the axial direction of the central magnet 1. One of the central magnet 1, the ring magnet assembly 2 and the coil 3 is fixedly connected to the screen 9.
Alternating current is introduced into the coil 3, the coil with the alternating current penetrates through a magnetic field formed by the central magnet 1 and the annular magnet assembly 2, so that an ampere force is formed between the coil 3 and the central magnet 1 and between the coil 3 and the annular magnet assembly 2, and the direction of the ampere force is perpendicular to the screen 9 because the direction of the magnetic field is parallel to the screen 9. Because the coil 3 is charged with alternating current, the direction of the generated ampere force is changed alternately, and the ampere force can be transmitted to the screen 9 through one of the central magnet 1, the annular magnet assembly 2 and the coil 3, so that the screen 9 vibrates and pushes air to generate sound.
The central magnet 1 is magnetized along the axial direction thereof, and the annular magnet assemblies 2 are radially directed to the center along the radial direction thereof; compared with the traditional structure, the magnetic circuit formed by the central magnet 1 and the annular magnet assembly 2 in the same volume has high driving efficiency, and the fluctuation is small in a large displacement range. The electromagnetic driving efficiency fluctuation can be kept within 10% within a displacement range of +/-0.5 mm.
As shown in fig. 3, the ring magnet assembly 2 and the coil 3 are respectively located at both ends of the central magnet, the N-pole of the ring magnet assembly 2 is disposed toward the central magnet 1, and the S-pole is disposed away from the central magnet 1; the N pole of the central magnet 1 is located near one end of the coil 3 and the S pole is located near one end of the ring magnet assembly 2.
Preferably, in the present embodiment, the center magnet 1 has a cylindrical shape. The coil 3 partially surrounds the outer side of the central magnet 1, and a gap is reserved between the coil and the central magnet 1. Annular magnet subassembly 2 is cyclic annular, forms 360 magnetic fields that encircle around central magnet 1, and coil 3 is when letting in the alternating current, and its each position homoenergetic can receive the effect of ampere force, and the whole atress of coil is more balanced and even to improve the stability of screen 9 vibration, avoided the phenomenon of polarization and sound distortion effectively.
Preferably, in the present embodiment, the ring magnet assembly 2 is formed by splicing a plurality of magnetic blocks 21. When the product size is small and radial magnetization of the ring magnet assembly 2 cannot be realized, the ring magnet assembly 2 formed by splicing a plurality of magnetic blocks 21 is selected. The number of the magnetic blocks is specifically 4-6, and the specific number can be selected according to the requirement. The magnetic block 21 in this embodiment has a fan-ring-like cross-sectional shape.
In other embodiments, the ring magnet assembly 2 comprises ring magnets, which are specifically selected only when the product size is large and radial magnetization of the ring magnet assembly 2 is easily achieved.
Preferably, the screen vibration sound production device further comprises a pole core 4, a magnetic bowl 5 and a pole piece 6; the pole piece 4 covers one end of the central magnet 1 close to the coil 3, i.e. the pole piece 4 covers the N pole of the central magnet 1. The pole piece 4 has the same shape as the central magnet 1 and the same cross-sectional size. The pole piece 4 is located within the coil 3.
Preferably, the screen vibration sound generating device further comprises an FPC7 and a support plate 8, one end of the coil 3, which is far away from the annular magnet assembly 2, is arranged on an FPC7, and an outgoing line of the coil 3 is electrically connected with the FPC7 and is fixed on the FPC7 in a welding mode, so that mechanical and electrical connection is realized. The FPC7 is provided on the support plate 8 and is fixed to the support plate 8 by means of bonding or soldering.
Preferably, the pole piece 6 or the support plate 8 is fixed to the back of the screen 9. The screen is fixed and attached to the back of the screen in a mode of not being limited to bonding and buckling. As shown in fig. 1 and 3, in the present embodiment, the support plate 8 is fixedly attached to the back surface of the screen 9; in other embodiments, as shown in fig. 4, the pole piece 6 is fixedly attached to the back of the screen 9.
Alternating current is introduced into the coil 3, the coil with the alternating current penetrates through a magnetic field formed by the central magnet 1 and the annular magnet assembly 2, so that an ampere force is formed between the coil 3 and the central magnet 1 and between the coil 3 and the annular magnet assembly 2, and the direction of the ampere force is perpendicular to the screen 9 because the direction of the magnetic field is parallel to the screen 9. Because the coil 3 is internally provided with alternating current, the direction of the generated ampere force is changed in an alternating direction, and the ampere force can be transmitted to the screen 9 through the pole piece 6 or the supporting plate 8 to vibrate the screen 9, so that the screen 9 vibrates and pushes air to generate sound.
The central magnet 1 is magnetized along the axial direction thereof, and the annular magnet assemblies 2 are radially directed to the center along the radial direction thereof; the pole core 4, the magnetic bowl 5 and the pole piece 6 have a magnetic gathering effect and can restrict a magnetic field. Compared with the traditional structure, the magnetic circuit formed by the central magnet 1 and the annular magnet assembly 2 in the same volume has high driving efficiency, and the fluctuation is small in a large displacement range.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A screen vibration sound generating apparatus, comprising:
a central magnet (1);
a ring magnet assembly (2) surrounding the center magnet (1), wherein the length of the ring magnet assembly (2) along the axial direction of the center magnet (1) is smaller than that of the center magnet (1);
a coil (3) at least partially surrounding the outside of the central magnet (1) and spaced from the ring magnet assembly (2) in the axial direction of the central magnet (1);
a screen (9), one of the central magnet (1), the ring magnet assembly (2) and the coil (3) being fixedly connected to the screen (9).
2. The screen vibrating sound generating device according to claim 1, wherein the ring magnet assembly (2) is formed by splicing a plurality of magnetic blocks (21).
3. A screen vibration sound generating device as defined in claim 1, further comprising a pole piece (4) covering an end of said central magnet (1) near said coil (3).
4. A screen vibration sound generating device according to claim 3, further comprising a magnetic bowl (5), wherein said central magnet (1) and said ring magnet assembly (2) are both disposed within said magnetic bowl (5), and wherein said coil (3) is at least partially located within said magnetic bowl (5).
5. The screen vibration sound generating device according to claim 4, further comprising a pole piece (6) covered on an end of the magnetic bowl (5) away from the coil (3), wherein an end of the central magnet (1) and the ring magnet assembly (2) away from the coil (3) is covered by the pole piece (6).
6. The screen vibration sound production device according to claim 5, wherein the pole core (4), the magnetic bowl (5) and the pole piece (6) are all made of magnetic conductive materials.
7. The screen vibration sound generating device according to claim 5, further comprising an FPC (7), wherein one end of the coil (3) away from the ring-shaped magnet assembly (2) is fixed on the FPC (7), and the coil (3) is electrically connected with the FPC (7).
8. The screen vibration sound generating apparatus according to claim 7, further comprising a support plate (8), wherein the FPC (7) is provided on the support plate (8).
9. The screen vibration sound production device according to claim 8, wherein the pole piece (6) or the support plate (8) is fixedly attached to the back surface of the screen (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021530526.8U CN212519424U (en) | 2020-07-29 | 2020-07-29 | Screen vibration sound production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021530526.8U CN212519424U (en) | 2020-07-29 | 2020-07-29 | Screen vibration sound production device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212519424U true CN212519424U (en) | 2021-02-09 |
Family
ID=74442592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021530526.8U Active CN212519424U (en) | 2020-07-29 | 2020-07-29 | Screen vibration sound production device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212519424U (en) |
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2020
- 2020-07-29 CN CN202021530526.8U patent/CN212519424U/en active Active
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