WO2019205658A1

WO2019205658A1 - Sound producing device, sound producing module, and electronic terminal

Info

Publication number: WO2019205658A1
Application number: PCT/CN2018/120389
Authority: WO
Inventors: 程汉龙; 张成飞; 刘春发
Original assignee: 歌尔股份有限公司
Priority date: 2018-04-27
Filing date: 2018-12-11
Publication date: 2019-10-31
Also published as: CN110418259A; CN110418259B

Abstract

The present application discloses a sound producing device, a sound producing module, and an electronic terminal. The sound producing device comprises a magnetic circuit system, a vibration assembly, and a circuit board. The magnetic circuit system comprises: a magnetic yoke; and a central magnetic portion and a side magnetic portion which are disposed on the magnetic yoke. At least one of the central magnetic portion and the side magnetic portion comprises a permanent magnet. A magnetic gap is formed between the central magnetic portion and the side magnetic portion. An accommodation slot is formed at a side of the side magnetic portion away from the magnetic gap. The vibration assembly comprises a diaphragm and a voice coil. One end of the voice coil is connected to the diaphragm, and the other end extends into the magnetic gap of the magnetic circuit system. The circuit board has an annular shape, and is inserted into the accommodation slot of the magnetic circuit system. The sound producing device of the present application has a more compact structure, thereby facilitating miniaturization and a lightweight design. In addition, the side magnetic portion is provided with the accommodation slot at the periphery, thereby enabling concentration of magnetic induction lines and improving field strength in the magnetic gap.

Description

Sounding device unit, sounding module and electronic terminal

Technical field

The present application relates to the field of electroacoustic conversion, and more particularly, to a sounding device unit; the present application also relates to a sound emitting module and an electronic terminal using the sounding unit.

Background technique

A sounding device is an important acoustic component in an electronic device that is a transducer that converts an electrical signal into an acoustic signal. Existing sounding devices include a housing, and a magnetic circuit system and a vibration assembly disposed within the housing.

Among them, dynamic coil sounding devices are widely used in consumer electronic products, and their working methods can meet the needs of speakers and earpieces of electronic products. In recent years, with the gradual development of electronic products, the performance requirements for speakers have gradually increased, and those skilled in the art need to provide sounding devices with better performance to fully utilize the acoustic characteristics of audio signals. On the other hand, consumer electronics such as mobile phones and tablet PCs are becoming lighter and thinner. This trend requires that the parts in electronic products be smaller and more compact to meet the size requirements of electronic products.

For the sounding device, the signal transmission component is an indispensable component for transmitting an acoustic signal to the vibration component, thereby realizing vibration sounding. The signal transmission component usually adopts a circuit board or a flexible circuit board and the like, which occupies a part of the space inside the sounding device, causing a space in the sounding device. The magnetic circuit system is another important component in the sounding device that is used to provide a driving force for the vibrating assembly. In order for the vibrating assembly to generate sufficient amplitude and output power, the magnetic circuit system needs to provide a corresponding magnetic field strength. However, in the case where the volume of the sounding device is limited, it is technically difficult to increase the magnetic field strength of the existing magnetic circuit system.

Therefore, it is necessary to improve the moving coil type sounding device to make the structure of the sounding device more compact. On the other hand, it is necessary to increase the magnetic field strength of the magnetic circuit system.

Summary of the invention

It is an object of the present application to provide a new technical solution for a sounding device unit.

According to a first aspect of the present application, there is provided a sounding device unit comprising a magnetic circuit system, a vibration component and a circuit board;

The magnetic circuit system includes a yoke and a central magnetic portion and a side magnetic portion disposed on the yoke, and at least one of the central magnetic portion and the side magnetic portion includes a permanent magnet, and the central magnetic portion and the side magnetic portion a magnetic gap is formed therebetween, and a receiving groove is formed on a side of the edge magnetic portion away from the magnetic gap;

The vibration assembly includes a diaphragm and a voice coil, one end of the voice coil is connected to the diaphragm, and the other end is extended into a magnetic gap of the magnetic circuit system;

The circuit board is annular, and the circuit board is embedded in a receiving slot of the magnetic circuit system.

Optionally, the edge magnetic portion includes a side magnet and an edge magnetic conductive plate, and the side magnetic conductive plate is disposed on the side magnet;

The side magnetic conductive plate is formed with a concave portion on a side opposite to the side magnet, and the concave portion is located at a side edge of the side magnetic conductive plate away from the central magnetic portion, and the concave portion constitutes the receiving groove ;

Or the side magnet is formed with a concave portion on a side opposite to the side magnetic conductive plate, the concave portion is located at a side edge of the side magnet away from the magnetic gap, and the concave portion constitutes the receiving groove;

Alternatively, a recessed portion is formed on a side opposite to the side magnet and the side magnetic conductive plate, and the recessed portions are located at one side edge away from the magnetic gap, and correspond to each other, and the side magnet and the side magnetically The recessed portion of the plate constitutes the receiving groove.

Optionally, the width of the receiving groove is less than 50% of the overall width of the side magnetic portion, and the width of the receiving groove is greater than the width of the corresponding side of the circuit board.

Optionally, the edge magnetic conductive plate has a flange extending to the outside of the side magnet, and the flange is located at a periphery of the receiving groove.

Optionally, one side surface of the circuit board is adhered to the receiving groove, and a gap is left between the other side surface of the circuit board and the inner surface of the receiving groove.

Optionally, the central magnetic portion has a rectangular structure as a whole, the side magnetic portion is disposed around the central magnetic portion, and the voice coil is led out with a lead wire, and the edge magnetic portion corresponds to the lead wire from the voice coil. An opening is formed at the upper lead, and the circuit board is formed with a pad at the opening, the lead extending onto the pad and making an electrical connection with the pad.

Optionally, the voice coil is jointly wound by two voice coil wires, four lead wires are drawn on the voice coil, and the edge magnetic portions are correspondingly formed with four openings, and the circuit board is in each A pad is formed at the opening, and each of the leads is electrically connected to a pad at a position corresponding to the opening.

Optionally, an edge portion of the diaphragm is fixed above the edge magnetic portion;

The projection of the diaphragm in its direction of vibration is located within the outer contour of the magnetic circuit system.

According to another aspect of the present application, a sound emitting module is further provided, comprising a module housing and the sounding device unit mounted in the module housing.

According to another aspect of the present application, there is also provided an electronic terminal comprising a terminal housing, and the sounding device unit mounted in the terminal housing or the sounding module mounted in the terminal housing.

According to an embodiment of the present disclosure, the circuit board can be housed in the receiving groove of the magnetic circuit system, and the structure of the sounding device unit is more compact, which facilitates the development of thinness and miniaturization. Further, by designing the accommodating groove at the periphery of the side magnetic portion, it is also possible to concentrate the magnetic susceptibility line and increase the strength of the magnetic field in the magnetic gap.

Other features and advantages of the present application will become apparent from the following detailed description of the exemplary embodiments.

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a schematic perspective structural view of a part of a sound emitting device unit provided by a specific embodiment of the present application;

2 is a schematic partial partial view of a part of a sound emitting device unit provided by a specific embodiment of the present application;

Figure 3 is a side cross-sectional view showing a part of a sound emitting device unit provided by a specific embodiment of the present application;

Figure 4 is a side cross-sectional view showing a part of a sound emitting device unit according to another embodiment of the present application;

Figure 5 is a side cross-sectional view of the sounding device unit provided by the specific embodiment of the present application.

detailed description

Various exemplary embodiments of the present application will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the application.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

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

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The present application provides an improved sounding device unit that includes a magnetic circuit system, a vibrating assembly, and a circuit board. The sounding device unit can be applied to the sounding module and the electronic terminal.

The magnetic circuit system is used to provide a vibration component with a driving force for driving vibration, in which a magnetic gap is formed. The magnetic circuit system includes a yoke and a central magnetic portion and a side magnetic portion disposed on the yoke. At least one of the central magnetic portion and the side magnetic portion includes a permanent magnet, and the magnetic gap is formed between the central magnetic portion and the side magnetic portion. The vibrating assembly includes a diaphragm and a voice coil, one end of the voice coil is coupled to the diaphragm, and the other end is extendable into the magnetic gap. The edge of the diaphragm can be fixedly connected to the sounding device unit. After the sound signal is passed through the voice coil, it can vibrate under the action of the magnetic field in the magnetic gap, thereby driving the diaphragm to vibrate and realize sound generation.

As shown in FIG. 1, a receiving groove 2 for accommodating the circuit board 4 is formed on a side of the edge magnetic portion away from the magnetic gap. The present application does not limit the specific shape and distribution form of the accommodating groove 2. In the embodiment of FIG. 1, the accommodating groove 2 is a recess that is opened inward from the surface of the side magnetic portion away from the magnetic gap toward the magnetic gap. groove. The extending direction of the accommodating groove 2 on the side magnetic portion extends along the longitudinal direction of the side magnetic portion. The circuit board 4 is used to transmit a sound signal to the voice coil 31, which is an important signal transmission component in the sounding device unit. The present application does not limit the specific form of the circuit board 4, and may adopt other forms of signal transmission components such as a circuit board and a flexible circuit board according to the needs of the actual product. The circuit board 4 occupies a part of the space in the sounding device unit, and the sounding device unit of the present application provides a space-optimized circuit board setting mode in the trend that the sounding device unit gradually becomes smaller and more compact.

In the embodiment shown in FIGS. 1-3, the region of the edge magnetic portion near the peripheral edge is pressed to form a recessed receiving groove 2, which extends around the periphery of the magnetic circuit system. The annular circuit board 4 is embedded in the accommodating groove 2. The overall shape of the sounding device unit does not become thick and wide due to the provision of the circuit board 4. Referring to Fig. 3, the circuit board 4 is completely embedded in the magnetic circuit system. The sounding device unit provided by the present application is designed to be more compact by designing the receiving groove, and the space occupied by the device can be reduced as much as possible without impairing the performance of the product.

In particular, by designing the accommodating groove at the periphery of the side magnetic portion, it is also possible to concentrate the magnetic susceptibility line and increase the strength of the magnetic field in the magnetic gap. Referring to Figures 1 and 3, the accommodating groove 2 located at the periphery of the side magnetic portion occupies a part of the space of the magnetic circuit system, i.e., the magnetic circuit system forms a part of the hollow at the periphery. The hollow portion of the magnetic circuit system cannot be magnetized. In contrast, in the case where the magnetic circuit of the magnetic circuit system is constant, the magnetic induction line is concentrated toward the side of the magnetic portion close to the magnetic gap, and the magnetic induction line is from the inner side of the receiving groove 2. Pass through the magnetic circuit system. Thus, the magnetic field strength inside the magnetic circuit system is improved, and the magnetic field strength at the magnetic gap 10 in the magnetic circuit system can be effectively improved. For the acoustic performance of the sounding device unit, the response sensitivity is improved and the acoustic performance is significantly improved.

As shown in FIG. 1-3, the side magnetic portion includes a side magnet 13 and an edge magnetic conductive plate 12, and the side magnetic conductive plate 12 is covered on the side magnet 13. The cover-side magnetic conductive plate 12 and the side magnet 13 are arranged to overlap each other, and the upper and lower positional relationship between the side magnetic conductive plate 12 and the side magnet 13 are not specifically limited. The side magnetic conductive plates 12 in FIGS. 2 and 3 are located. The lower side of the side magnet 13 does not mean that the sounding device unit is actually applied. The side magnetic conducting plate 12 must be located on the lower side of the side magnet 13. Specifically, the side magnetic conductive plate 12 is formed with a recessed portion on a surface opposite to the side magnet 13 , and the recessed portion constitutes the accommodating groove 2 after the magnetic conductive plate 12 is attached to the side magnet 13 . The recessed portion on the side magnetic conductive plate 12 is preferably close to the outer edge of the side magnetic conductive plate 12, that is, the depressed portion is located on the side of the magnetic conductive plate away from the central magnetic portion, so that the magnetic induction line is gathered toward the side close to the central magnetic portion. .

In other alternative similar embodiments, the recess is formed on a side surface of the side magnet opposite the side magnetic plate. After the side magnetic conductive plate is covered with the side magnet, the recessed portion constitutes the receiving groove. Similarly, the depressed portion is preferably located on a side of the side magnet away from the central magnetic portion, near the edge, so that the magnetic line of inductance is gathered toward the side close to the central magnetic portion. Alternatively, the side magnet and the side magnetic conductive plate are each formed with a recessed portion on the opposite side, and the positions of the recessed portions of the two are corresponding to each other, and the two recessed portions are combined to constitute the receiving groove. The recessed portion is located at a side edge of the side magnet and the side magnetic conductive plate away from the magnetic gap.

In another embodiment in which the magnetic circuit system includes a side magnetic portion and a central magnetic portion, the magnetic circuit system includes a lower magnetic plate, and the central magnetic portion is disposed at a central portion of the lower magnetic conductive plate. A magnetic conductive sidewall is formed on the lower magnetic conductive plate, and the magnetic conductive sidewall extends upward from the lower magnetic conductive plate to surround the central magnetic portion. Thus, the magnetic conductive sidewall constitutes the edge magnetic portion, and a magnetic gap can be formed between the central magnetic portion and the magnetic conductive sidewall. The receiving groove may be formed on the magnetic conductive sidewall, and the circuit board is embedded in the magnetic conductive sidewall. Preferably, the receiving groove is formed on an outer surface of the magnetic conductive side wall, or the receiving groove extends inward from an outer surface of the magnetic conductive side wall. In this way, the magnetic line of inductance in the magnetically conductive side wall can be gathered toward the side close to the central magnetic portion.

In another embodiment in which the magnetic circuit system includes a side magnetic portion and a central magnetic portion, the side magnetic portion includes a side magnet. The receiving groove may be directly opened at the outer periphery of the side magnet, for example, the receiving groove may be opened on the outer surface of the side magnet or may extend inward from the outer surface of the side magnet.

The present application provides the above various embodiments for the position of the accommodating groove and the components formed thereon. When the sound absorbing device is actually applied, the selection may be made according to performance requirements and dimensional structure requirements, which is not limited in the present application.

In addition, the present application also provides an improved magnetic circuit system arrangement. As shown in FIGS. 1, 2, and 4, the outer edge of the side magnetic conductive plate 12 is formed with a bent edge which surrounds the outer side of the side magnet 13 and the accommodating groove 2. The end face of the flange can be used to carry the lead 311 in the sounding device unit or to support the side magnetic conductive plate 12 itself. The receiving groove 2 is formed on the inner side of the flange, as shown in FIG. The flange of the side magnetic conducting plate 12, the surface of the side magnet 13 and the recess formed on the side magnetic conducting plate 12 together form a closed receiving groove 2, which can better face the circuit board 4 Play a role in positioning and fixing. Referring to Figures 1 and 2, it is seen that a portion of the circuit board 4 extends into the receiving slot 2 between the side magnetically permeable plate 12 and the side magnets 13, and the pads 41 on the circuit board 4 for electrical connection with the leads 311. It is then exposed outside the receiving tank 2 to form an electrical connection.

The ratio of the width of the receiving groove to the overall width of the edge magnetic portion affects the magnetic field performance of the magnetic circuit system. Preferably, in the embodiment shown in Figures 3-5, the width of the receiving groove 2 is less than 50% of the overall width of the magnetic portion. If the width of the accommodating groove 2 in the side magnetic portion is too large, there is a possibility that the effective thickness of the magnetic field capable of conducting the magnetic field is lowered, thereby affecting the magnetic field performance of the magnetic circuit system. On the other hand, the width of the receiving groove is preferably larger than the width of the side of the corresponding circuit board, so that the circuit board can be completely accommodated in the receiving groove. Optionally, the receiving groove has a width of 0.1 mm.

In the embodiment shown in FIGS. 1 and 2, the edge magnetic portion includes a total of four side magnets 13 and a side magnetic conductive plate 12, and a recessed portion is formed on a surface of each of the side magnetic conductive plates 12 near the outer edge for The accommodating groove 2 is formed. Wherein, the periphery of the recessed portion of the long-length side magnetic conductive plate 12 is not surrounded by other structures, as shown in FIG. 3; the periphery of the depressed portion of the shorter-length side magnetic conductive plate 12 is also formed with a bent edge, and the bent edge is opposite to the receiving groove. 2 forms a bracket, as shown in Figure 4. In the present application, the edge magnetic portion specifically includes several side magnets and side magnetic conductive plates, and the outer edges of the magnetic conductive plates are also bent to form a curved edge. In the specific implementation, it can be configured according to the performance and shape requirements of the sounding device unit. Further, the circuit board 4 is formed with a pad 41 for electrically connecting with the lead 311 drawn from the voice coil 31 for signal conduction. The four side magnets 13 enclose a ring shape similar to a rectangle, and gaps are left between the ends of the adjacent two side magnets 13, and the ends of the two side magnets 13 are not connected. The gap forms an opening in the side magnetic portion, and the side magnetic conductive plate 12 covered on the side magnet 13 conforms to the structural features of the side magnet 13. In order to facilitate the connection of the lead 311 to the pad 41, on the one hand, the position of the lead 311 drawn from the voice coil 31 corresponds to the position of the opening, and on the other hand, the pad 41 is disposed at the opening, as shown in FIG. 2 shows. The circuit board 4 protrudes from a section of the accommodating groove 2, and the land 41 is formed at the exposed position, after which the circuit board 4 is further extended into the other stage accommodating groove 2. That is, the magnetic circuit system has a rectangular structure as a whole, and the position where the circuit board 4 protrudes from the accommodating groove 2 is located at the corner position of the magnetic circuit system. The pad 41 is formed at a corner position of the magnetic circuit system.

Optionally, the voice coil is integrally wound by two voice coil wires, and four lead wires are led out on the voice coil. These four leads are the two line ends of the two voice coil lines. The side magnetic portion is formed with four openings correspondingly, and the circuit board is formed with one pad at each opening, and each of the lead wires is electrically connected to a pad at a position corresponding to the opening.

Thus, in the present application, the winding of the voice coil is wound by two voice coils, and the two incoming wires and the two outgoing wires form four floating leads. The four suspended leads form a geometrically symmetric distribution, and the reaction force to the vibration system is more symmetrical when vibrating, thereby greatly reducing the polarization of the product, improving the distortion and improving the sound quality; in addition, the design makes the sounding monomer have a higher BL value, thereby improving The sensitivity of the monomer.

Preferably, for the embodiment in which the receiving groove is formed between the edge magnet and the side magnetic conductive plate, one side surface of the circuit board may be adhered and fixed to the surface of the side magnetic conductive plate or the side magnet forming the concave portion. A gap is left between the other side surface of the circuit board and the inner surface of the receiving groove. That is, the height of the receiving groove formed by the recessed portion is slightly larger than the thickness of the circuit board, so that the magnetic conductive plate and the side magnet are pressed against the circuit board after the sounding device is assembled, thereby improving the reliability of the circuit board and avoiding damage thereto. .

Optionally, as shown in FIG. 2-5, the central magnetic portion may include a central magnet 11 and a central magnetic conductive plate 14 that is disposed on the central magnet 11. The side magnetic conductive plate 12 and the central magnetic conductive plate 14 function to gather magnetic lines of force, so that the magnetic fields generated by the central magnet 11 and the side magnets 13 are concentrated into the magnetic gap 10, thereby increasing the magnetic field strength in the magnetic gap 10.

In particular, as shown in FIG. 5, the sounding device unit provided by the present application may not have an outer casing for carrying the components, and the magnetic circuit system itself constitutes a main structure of the sounding device unit. The edge of the diaphragm may be directly fixed above the side magnetic portion, and the orthographic projection of the diaphragm along its own vibration direction is located within the outer contour of the magnetic circuit system. The voice coil 31 is connected to the central area of the diaphragm. The end of the voice coil 31 away from the diaphragm can be suspended in the magnetic gap 10 by the suspension action of the diaphragm. The sounding device unit can be directly assembled in the sounding device module or the electronic terminal through the magnetic circuit system, and no additional configuration of the housing is required.

The application further provides a sounding module, which comprises a module housing and the sounding device unit, and the sounding device unit is disposed in the module housing. The application further provides an electronic terminal, which comprises a terminal housing, wherein the terminal can be provided with a sounding device unit or a sounding module carrying a sounding device unit.

Although the specific embodiments of the present application have been described in detail by way of example, those skilled in the art should understand that the above examples are only for the purpose of illustration and not limitation. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

A sounding device unit, comprising: a magnetic circuit system, a vibration component and a circuit board;

The magnetic circuit system includes a yoke and a central magnetic portion and a side magnetic portion disposed on the yoke, and at least one of the central magnetic portion and the side magnetic portion includes a permanent magnet, and the central magnetic portion and the side magnetic portion a magnetic gap is formed therebetween, and a receiving groove is formed on a side of the edge magnetic portion away from the magnetic gap;

The vibration assembly includes a diaphragm and a voice coil, one end of the voice coil is connected to the diaphragm, and the other end is extended into a magnetic gap of the magnetic circuit system;

The circuit board is annular, and the circuit board is embedded in a receiving slot of the magnetic circuit system.
The sounding device unit according to claim 1, wherein the edge magnetic portion comprises a side magnet and an edge magnetic conductive plate, and the side magnetic conductive plate is disposed on the side magnet;

The side magnetic conductive plate is formed with a concave portion on a side opposite to the side magnet, and the concave portion is located at a side edge of the side magnetic conductive plate away from the central magnetic portion, and the concave portion constitutes the receiving groove ;

Or the side magnet is formed with a concave portion on a side opposite to the side magnetic conductive plate, the concave portion is located at a side edge of the side magnet away from the magnetic gap, and the concave portion constitutes the receiving groove;

Alternatively, a recessed portion is formed on a side opposite to the side magnet and the side magnetic conductive plate, and the recessed portions are located at one side edge away from the magnetic gap, and correspond to each other, and the side magnet and the side magnetically The recessed portion of the plate constitutes the receiving groove.
The sounding device unit according to claim 1 or 2, wherein the width of the receiving groove is less than 50% of the entire width of the side magnetic portion, and the width of the receiving groove is larger than the width of the side of the corresponding circuit board.
A sounding device unit according to any one of claims 1 to 3, wherein said side magnetic conducting plate has a flange extending to the outside of said side magnet, said flange being located at the periphery of said receiving groove .
The sounding device unit according to any one of claims 1 to 4, wherein one side surface of the circuit board is stuck to the receiving groove, and the other side surface of the circuit board and the receiving groove There is a gap between the inner surfaces.
The sounding device unit according to any one of claims 1 to 5, wherein the central magnetic portion has a rectangular structure as a whole, and the magnetic portion is disposed around the central magnetic portion on the voice coil. Leading the lead, the edge magnetic portion is formed with an opening at a position corresponding to the lead wire being led out from the voice coil, the circuit board is formed with a pad at the opening, and the lead wire extends to the pad And forming an electrical connection with the pad.
The sounding device unit according to any one of claims 1 to 6, wherein the voice coil is wound by two voice coil wires, and four voice wires are led out from the voice coil. The edge magnetic portion is formed with four openings correspondingly, and the circuit board is formed with a pad at each opening, and each of the leads is electrically connected to a pad at an opening corresponding to the position.
A sounding device unit according to any one of claims 1 to 7, wherein

An edge portion of the diaphragm is fixed above the side magnetic portion;

The projection of the diaphragm in its direction of vibration is located within the outer contour of the magnetic circuit system.
The sound emitting module is characterized by comprising a module housing and a sounding device unit according to any one of claims 1-8 installed in the module housing.
An electronic terminal, comprising: a terminal housing, and the sounding device unit according to any one of claims 1 to 8 installed in the terminal housing, or the apparatus according to claim 9 installed in the terminal housing Sound module.