Sound production unit

Abstract

The utility model discloses a sounding unit, which comprises a yoke, a plurality of voice coils and at least four central magnetic structures, the yoke is provided with a plurality of longitudinal windows and a plurality of transverse windows, the longitudinal windows are communicated with the transverse windows, two opposite sides of the longitudinal windows are respectively provided with longitudinal flanges, and two opposite sides of the transverse windows are respectively provided with transverse flanges; the central magnetic structures are arranged on the yoke, the at least four central magnetic structures are arranged in an N * M rectangular array, N is an even number greater than or equal to 2, and M is an even number greater than or equal to 2; longitudinal windows are correspondingly arranged between every two adjacent columns of center magnetic structures, and transverse windows are correspondingly arranged between every two adjacent rows of center magnetic structures. The magnetic poles of the two adjacent central magnetic structures face opposite directions; the voice coils and the center magnetic structures are arranged in a one-to-one correspondence mode, and when the voice coils are powered on, the current flow directions of the adjacent edges of every two adjacent voice coils are the same. The sound production unit overcomes the problem of vibration sound production of a sound production unit with a multi-voice-coil structure in a non-starting state.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to a sound generating unit. Background Technology

[0002] As electronic devices such as mobile phones and tablets become smaller and thinner, the space available for installing sound units is getting smaller and smaller. At the same time, the requirements for the acoustic performance of sound units are getting higher and higher. Therefore, how to improve the performance of sound units under the constraints of their structure and size has become the key.

[0003] To improve the acoustic performance of thinner and lighter sound units, related technologies offer a design scheme with multiple voice coils and a multi-center magnetic structure. This design allows the sound unit to maintain its acoustic performance while reducing its thickness. However, in electronic devices equipped with multi-voice coil sound units, when there are conductors conducting alternating current near the sound unit and the sound unit is in a deactivated state, the alternating current in the conductors generates an alternating magnetic field. This alternating magnetic field induces a current in the voice coils of the sound unit. The voice coils that generate this induced current are then subjected to the magnetic field of the magnetic circuit components within the sound unit, resulting in a corresponding Ampere force. In existing technologies, the magnetic poles of the central magnetic structures within multiple voice coils face the same direction, and the induced currents in multiple voice coils are in the same direction. Therefore, the Ampere force exerted on adjacent voice coils by the magnetic field is the same in magnitude and direction. This causes the diaphragm assembly to vibrate and produce sound even when the sound unit is not in use, which undoubtedly affects the user experience. Utility Model Content

[0004] The main purpose of this invention is to propose a high-performance sound generating unit with a multi-voice coil architecture, which aims to solve the problem of vibration sound generation in the inactive state of existing multi-voice coil architecture sound generating units.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sound-generating unit, comprising:

[0006] A yoke, which has a plurality of longitudinal openings and a plurality of transverse openings, the longitudinal openings being connected to the transverse openings, and longitudinal flanges on opposite sides of the longitudinal openings and transverse flanges on opposite sides of the transverse openings.

[0007] At least four central magnetic structures are disposed on the yoke. The at least four central magnetic structures are arranged in an N*M rectangular array, where N is an even number greater than or equal to 2 and M is an even number greater than or equal to 2. A longitudinal window is provided between two adjacent columns of central magnetic structures, and a transverse window is provided between two adjacent rows of central magnetic structures. In the row direction, the magnetic poles of two adjacent central magnetic structures face opposite directions, and in the column direction, the magnetic poles of two adjacent central magnetic structures face opposite directions.

[0008] Multiple voice coils are provided, each corresponding to a central magnetic structure. When a voice coil is energized, the current flows in the same direction on adjacent sides of two adjacent voice coils.

[0009] In one embodiment, in the column direction, a first side magnetic structure or a first outer flange is provided on the outside of the central magnetic structure located at the end.

[0010] In one embodiment, in the row direction, a second side magnetic structure or a second outer flange is provided on the outside of the central magnetic structure located at the end.

[0011] In one embodiment, the top end face of the longitudinal flange is flush with or lower than the top surface of the central magnetic structure; the top end face of the transverse flange is flush with or lower than the top surface of the central magnetic structure.

[0012] In one embodiment, the voice coils are connected in series or in parallel.

[0013] In one embodiment, at least two adjacent voice coils are electrically connected through a bridging FPC board, which is fixedly connected to the two adjacent voice coils.

[0014] In one embodiment, at the junction of the horizontal window and the vertical window, the horizontal flange is connected to the vertical flange.

[0015] In one embodiment, at the junction of the horizontal window and the vertical window, the horizontal flange and the vertical flange are connected by an arc-shaped flange.

[0016] In one embodiment, a longitudinal end flange is connected to the end edge of the longitudinal window, and the longitudinal end flange is connected to two adjacent longitudinal flanges.

[0017] In one embodiment, a lateral end flange is connected to the end edge of the lateral window, and the lateral end flange is connected to two adjacent lateral flanges.

[0018] The beneficial effects of this utility model are as follows:

[0019] This sound unit features a novel structure with at least four central magnetic structures arranged in a rectangular array. This improves the magnetic utilization of the central magnetic structures, increases the magnetic field strength of the sound unit, and achieves a four-voice-coil architecture. This significantly extends the effective voice coil length within the magnetic gap, resulting in a substantial increase in the overall BL value of the sound unit and ensuring high performance.

[0020] In an electronic device equipped with this sound-generating unit, when the voice coil is affected by the alternating current of an external conductor and generates an induced current, since the induced currents of multiple voice coils are in the same direction, and the magnetic poles of the central magnetic structure in adjacent voice coils are facing opposite directions, the Ampere forces exerted by the magnetic field of the magnetic circuit components in the sound-generating unit on adjacent voice coils are opposite, thus compensating and canceling each other out. This overcomes the problem of vibration and sound generation in the non-activated state of the multi-voice coil structure sound-generating unit, and realizes the passive compensation and noise reduction function of the multi-voice coil sound-generating unit structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a portion of the structure of the sound-generating unit in Embodiment 1 of this utility model;

[0023] Figure 2 This is a cross-sectional view of the sound-generating unit according to Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the magnetic circuit and current direction of the sound-generating unit in Embodiment 1 of this utility model.

[0025] Explanation of icon numbers:

[0026] 1. Pot stand;

[0027] 2. Diaphragm assembly;

[0028] 3. Voice coil;

[0029] 4. Yoke; 41. Longitudinal window; 42. Horizontal window; 43. Longitudinal flange; 44. Horizontal flange; 45. Arc flange; 46. Longitudinal end flange; 47. Horizontal end flange;

[0030] 5. Central magnetic structure; 51. Central magnet; 52. Central washer;

[0031] 6. First side magnetic structure; 61. First side magnet; 62. First side washer. Detailed Implementation

[0032] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0036] Furthermore, if the meaning of "and / or" appears throughout the text, it refers to three parallel solutions. For example, "and / or" includes solution 1, solution 2, and solution 3, which simultaneously satisfy the above conditions. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Example 1

[0039] Please refer to Figures 1 to 3 The first embodiment of this utility model is: a sound generating unit, including a frame 1 and a vibration assembly and a magnetic circuit assembly respectively connected to the frame 1. The vibration assembly includes a diaphragm assembly 2 and a plurality of voice coils 3. The voice coils 3 are connected to the diaphragm assembly 2, and the diaphragm assembly 2 is connected to the frame 1.

[0040] The magnetic circuit assembly includes a yoke 4 and at least four central magnetic structures 5 disposed on the yoke 4. The yoke 4 has a plurality of longitudinal openings 41 and a plurality of transverse openings 42. The longitudinal openings 41 and the transverse openings 42 are perpendicularly connected. The longitudinal openings 41 have longitudinal flanges 43 on opposite sides, and the transverse openings 42 have transverse flanges 44 on opposite sides. The at least four central magnetic structures 5 are arranged in an N*M rectangular array, where N is an even number greater than or equal to 2 and M is an even number greater than or equal to 2. The longitudinal openings 41 are disposed between adjacent columns of central magnetic structures 5, and the transverse openings 42 are disposed between adjacent rows of central magnetic structures 5. In the row direction, the magnetic poles of two adjacent central magnetic structures 5 are oriented in opposite directions, and in the column direction, the magnetic poles of two adjacent central magnetic structures 5 are oriented in opposite directions. The central magnetic structures 5 are disposed in a one-to-one correspondence with the voice coils 3. When the voice coils 3 are energized, the current flows in the same direction on the adjacent sides of two adjacent voice coils 3.

[0041] It is not difficult to understand that the yoke 4, the central magnetic structure 5 and the longitudinal flange 43 near the central magnetic structure 5 constitute the first magnetic circuit, and the yoke 4, the central magnetic structure 5 and the transverse flange 44 near the central magnetic structure 5 constitute the second magnetic circuit.

[0042] The central magnetic structure 5 includes a central washer 52 and a central magnet 51 connecting the central washer 52 and the yoke 4. The central magnet 51 is located below the central washer 52. To facilitate the processing and manufacturing of the yoke 4, optionally, the longitudinal flange 43 and the transverse flange 44 are formed by stamping and bending a portion of the yoke 4.

[0043] In one or more embodiments, the magnetic circuit assembly further includes a first side magnetic structure 6 disposed on the yoke 4. In the column direction, the first side magnetic structure 6 is disposed outside the central magnetic structure 5 located at the end. The magnetic pole orientation of the first side magnetic structure 6 is opposite to that of the central magnetic structure 5 adjacent to it. The first side magnetic structure 6 includes a first side washer 62 and a first side magnet 61 connecting the first side washer 62 and the yoke 4. The first side magnet 61 is located below the first side washer 62. In some embodiments, a first outer flange formed by bending a portion of the yoke 4 may replace part or all of the first side magnetic structure 6.

[0044] Similarly, in one or more embodiments, the magnetic circuit assembly further includes a second side magnetic structure disposed on the yoke 4. In the row direction, a second side magnetic structure (not shown) is provided outside the central magnetic structure 5 located at the end. The magnetic pole orientation of the second side magnetic structure is opposite to that of the central magnetic structure 5 adjacent to it. The second side magnetic structure includes a second side washer and a second side magnet connecting the second side washer and the yoke 4. The second side magnet is located below the second side washer. In some embodiments, a second outer flange formed by bending a portion of the yoke 4 can replace part or all of the second side magnetic structure.

[0045] The top end face of the longitudinal flange 43 is flush with or lower than the top surface of the central magnetic structure 5, and the longitudinal flange 43 does not obstruct the downward vibration of the diaphragm; similarly, the top end face of the transverse flange 44 is flush with or lower than the top surface of the central magnetic structure 5, and the transverse flange 44 does not obstruct the downward vibration of the diaphragm. This ensures the downward vibration amplitude of the sound-generating unit and guarantees that the sound-generating unit can achieve high performance.

[0046] At least two adjacent voice coils 3 are electrically connected through a bridging FPC board (not shown in the figure), and the bridging FPC board is fixedly connected to the two adjacent voice coils 3. Each voice coil 3 is connected in series or in parallel.

[0047] To improve the magnetic conductivity of the yoke 4 and give the sound unit better performance, preferably, at the connection between the horizontal window 42 and the vertical window 41, the horizontal flange 44 and the vertical flange 43 are connected. For ease of processing, preferably, at the connection between the horizontal window 42 and the vertical window 41, the horizontal flange 44 and the vertical flange 43 are connected by an arc-shaped flange 45.

[0048] Optionally, a longitudinal end flange 46 is connected to the end edge of the longitudinal window 41. The longitudinal end flange 46 connects to two adjacent longitudinal flanges 43. The longitudinal end flange 46 can, to a certain extent, support the longitudinal flanges 43, which helps to improve the structural stability of the yoke 4. Similarly, a transverse end flange 47 is connected to the end edge of the transverse window 42. The transverse end flange 47 connects to two adjacent transverse flanges 44.

[0049] In this embodiment, the values ​​of N and M are both 2. In other embodiments, N and M can be other values, such as 4, 6, etc., and the values ​​of N and M can be the same or different.

[0050] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the contents of this utility model specification and drawings under the utility model concept, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A sound-generating unit, characterized in that: include A yoke, which has a plurality of longitudinal openings and a plurality of transverse openings, the longitudinal openings being connected to the transverse openings, and longitudinal flanges on opposite sides of the longitudinal openings and transverse flanges on opposite sides of the transverse openings. At least four central magnetic structures are disposed on the yoke. The at least four central magnetic structures are arranged in an N*M rectangular array, where N is an even number greater than or equal to 2 and M is an even number greater than or equal to 2. A longitudinal window is provided between two adjacent columns of central magnetic structures, and a transverse window is provided between two adjacent rows of central magnetic structures. In the row direction, the magnetic poles of two adjacent central magnetic structures face opposite directions, and in the column direction, the magnetic poles of two adjacent central magnetic structures face opposite directions. Multiple voice coils are provided, each corresponding to a central magnetic structure. When a voice coil is energized, the current flows in the same direction on adjacent sides of two adjacent voice coils.

2. The sound-generating unit according to claim 1, characterized in that: In the column direction, a first side magnetic structure or a first outer flange is provided on the outside of the central magnetic structure located at the end.

3. The sound-generating unit according to claim 1, characterized in that: In the row direction, a second side magnetic structure or a second outer flange is provided on the outside of the central magnetic structure located at the end.

4. The sound-generating unit according to claim 1, characterized in that: The top end face of the longitudinal flange is flush with or lower than the top surface of the central magnetic structure; the top end face of the transverse flange is flush with or lower than the top surface of the central magnetic structure.

5. The sound-generating unit according to claim 1, characterized in that: Each of the aforementioned voice coils is connected in series or in parallel.

6. The sound-generating unit according to claim 1, characterized in that: At least two adjacent voice coils are electrically connected through a bridging FPC board, which is fixedly connected to the two adjacent voice coils.

7. The sound-generating unit according to claim 1, characterized in that: At the junction of the horizontal window and the vertical window, the horizontal flange is connected to the vertical flange.

8. The sound-generating unit according to claim 7, characterized in that: At the junction of the horizontal window and the vertical window, the horizontal flange and the vertical flange are connected by an arc-shaped flange.

9. The sound-generating unit according to claim 1, characterized in that: A longitudinal end flange is connected to the end edge of the longitudinal window, and the longitudinal end flange is connected to two adjacent longitudinal flanges.

10. The sound-generating unit according to claim 1, characterized in that: A horizontal end flange is connected to the end edge of the horizontal window, and the horizontal end flange is connected to two adjacent horizontal flanges.

Images