Sound production unit

Abstract

The utility model discloses a sounding unit, which comprises a frame, a diaphragm assembly, a voice coil, a magnetic circuit assembly, a plurality of electromagnet assemblies and a plurality of permanent magnets, and is characterized in that the diaphragm assembly is connected with the frame; the voice coil is connected with the diaphragm assembly. The magnetic circuit assembly is connected with the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and the magnetic circuit assembly is provided with a magnetic gap for the voice coil to move; the electromagnet assembly is arranged on the side, close to the yoke, of the vibrating diaphragm assembly and corresponds to the central area of the central magnetic structure, and the electromagnet assembly comprises a soft magnet and a coil arranged around the soft magnet; a plurality of permanent magnets are arranged in a row, the permanent magnets are arranged on one side, close to the yoke, of the vibrating diaphragm assembly and are arranged corresponding to the central area of the central magnetic structure, and an electromagnet assembly is correspondingly arranged between every two adjacent permanent magnets; the magnetic pole polarity of one end of the permanent magnet close to the central magnetic structure is the same as the magnetic pole polarity of one end of the central magnetic structure close to the diaphragm assembly. The sound production unit is large in driving force and good in performance.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic converters, in particular to a sound generating unit. Background Art

[0002] At present, dynamic sound units such as sound units drive the coil through electromagnetic force. The coil drives the diaphragm bonded to it to do reciprocating motion, thereby radiating sound waves outward. The driving force of the sound unit comes from the Ampere force generated by the current-carrying wire in the voice coil cutting the magnetic lines of force. The area with dense magnetic lines of force in the conventional structure is the magnetic gap between the inner and outer washers.

[0003] Usually the volume of the center magnet is significantly larger than that of the side magnet. Some earlier magnetic circuits do not even have side magnets, only the flange of the yoke. For the center magnet, the edge area close to the voice coil has a great influence on the driving force, while the magnetic flux density generated in the middle area is not fully utilized, and the efficiency of the magnet cannot be further improved, which in turn makes it impossible to further improve the performance of the sound unit. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a high-performance sound-generating unit with large driving force.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: the sound unit includes:

[0006] basin stand;

[0007] A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame;

[0008] A voice coil connected to the diaphragm assembly;

[0009] A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and the magnetic circuit assembly has a magnetic gap for the voice coil to move;

[0010] A plurality of electromagnet assemblies, wherein the electromagnet assemblies are arranged on a side of the diaphragm assembly close to the yoke and corresponding to a central area of ​​the central magnetic structure, and the electromagnet assemblies include a soft magnetic body and a coil arranged around the soft magnetic body;

[0011] A plurality of permanent magnets are arranged in a row, the permanent magnets are arranged on a side of the diaphragm assembly close to the yoke and corresponding to the central area of ​​the central magnetic structure, the electromagnet assembly is correspondingly arranged between two adjacent permanent magnets, and the magnetic pole polarity of one end of the permanent magnet close to the central magnetic structure is the same as the magnetic pole polarity of one end of the central magnetic structure close to the diaphragm assembly.

[0012] In one embodiment, the plurality of electromagnet assemblies and the plurality of permanent magnets form a planar symmetrical structure.

[0013] In one embodiment, the number of the electromagnet assemblies is two, and the number of the permanent magnets is three.

[0014] In one embodiment, the diaphragm assembly includes a sound membrane and a middle sticker, the sound membrane includes an inner fixed part, a folded ring part and an outer fixed part which are sequentially connected from the inside to the outside, the outer fixed part is connected to the basin frame, the inner fixed part is provided with a window, the middle sticker is connected to the inner fixed part and closes the window, and the electromagnet assembly and the permanent magnet are arranged on the middle sticker.

[0015] In one embodiment, the middle sticker is located on a side of the inner fixing portion away from the yoke.

[0016] In one embodiment, a frame is further included, and the voice coil is indirectly connected to the diaphragm assembly through the frame.

[0017] In one embodiment, the frame is in the shape of a rectangular frame as a whole.

[0018] In one embodiment, a top surface of the central magnetic structure is provided with an avoidance groove for avoiding the electromagnet assembly and the permanent magnet.

[0019] In one embodiment, the central magnetic structure includes a central magnetic steel and a central washer, the central magnetic steel connects the central washer and the yoke, and the avoidance groove connects the top surface and the bottom surface of the central washer.

[0020] In one embodiment, a portion of the avoidance groove is located on the central washer, and another portion is located on the central magnetic steel.

[0021] The beneficial effects of the utility model are:

[0022] The sound unit has a novel structure. An electromagnet assembly is added to the diaphragm assembly. The direction of the magnetic pole of the electromagnet assembly can be changed by switching the direction of the current passed through the coil, thereby generating attraction or repulsion with the central magnetic structure. The sum of the force exerted on the electromagnet assembly and the Ampere force generated by the voice coil cutting the magnetic flux lines is the driving force of the sound unit. In other words, the sound unit is a hybrid driving architecture of a dynamic coil and a moving iron, and its total driving force has been significantly improved, thereby further improving the performance of the sound unit.

[0023] The electromagnet assembly located above the central area of ​​the central magnetic structure fully utilizes the magnetic flux generated in the middle area of ​​the central magnetic structure, effectively improving the electroacoustic conversion efficiency.

[0024] The permanent magnet can prevent the soft magnet from being attracted by the central magnetic structure and causing the diaphragm assembly to collapse when the coil is not powered on. The electromagnet assembly using the soft magnet as the core material has a stronger magnetic effect, which is beneficial to enhance the driving force of the sound unit to a greater extent and further improve the performance of the sound unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is an exploded view of the sound unit of the first embodiment of the utility model;

[0027] Figure 2 It is a cross-sectional view of the sound unit of the first embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the sound-emitting unit after the diaphragm assembly is hidden in the first embodiment of the utility model.

[0029] Description of Figure Numbers:

[0030] 1. Basin stand;

[0031] 2. Sound film;

[0032] 3. Middle sticker;

[0033] 4. Voice coil;

[0034] 5. Magnetic circuit assembly; 51. Yoke iron; 52. Center magnetic structure; 521. Center magnetic steel; 522. Center washer; 53. Side magnetic structure; 531. Side magnetic steel; 532. Side washer; 54. Avoidance slot;

[0035] 6. Electromagnet assembly; 61. Soft magnetic body; 62. Coil;

[0036] 7. Skeleton;

[0037] 8. Centering support piece;

[0038] 9. Permanent magnet. DETAILED DESCRIPTION

[0039] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0043] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] Please refer to Figures 1 to 3, Embodiment 1 of the present utility model is: a sound unit, comprising a basin frame 1, a diaphragm assembly, a voice coil 4, a magnetic circuit assembly 5, a plurality of electromagnet assemblies 6 and a plurality of permanent magnets 9, the diaphragm assembly and the magnetic circuit assembly 5 are respectively connected to the basin frame 1, the voice coil 4 is located in the basin frame 1 and connected to the diaphragm assembly, the magnetic circuit assembly 5 comprises a yoke 51 and a central magnetic structure 52 and a side magnetic structure 53 respectively arranged on the yoke 51, the magnetic circuit assembly 5 has a magnetic gap for the movement of the voice coil 4, specifically, the central magnetic structure 52 is located between at least one group of two side magnetic structures 53 arranged oppositely, a magnetic gap for the movement of the voice coil 4 is formed between the central magnetic structure 52 and the side magnetic structure 53, and the side magnetic structure 53 is connected to the basin frame 1; the electromagnet assembly 6 is arranged at the diaphragm assembly near the yoke 51 One side of the diaphragm assembly and corresponding to the central area of ​​the central magnetic structure 52, the electromagnet assembly 6 includes a soft magnet 61 and a coil 62 arranged around the soft magnet 61, a plurality of permanent magnets 9 are arranged in a row, the permanent magnet 9 is arranged on the side of the diaphragm assembly close to the yoke 51 and corresponding to the central area of ​​the central magnetic structure 52, the electromagnet assembly 6 is respectively provided between two adjacent permanent magnets 9, the magnetic pole polarity of one end of the permanent magnet 9 close to the central magnetic structure 52 is the same as the magnetic pole polarity of one end of the central magnetic structure 52 close to the diaphragm assembly, so that the soft magnet 61 can be prevented from being attracted by the central magnetic structure 52 when the coil 62 is not powered on, so that the diaphragm assembly collapses, the soft magnet 61 can be selected from iron material, etc., and the permanent magnet 9 assembly can be selected from neodymium iron boron magnet, etc.

[0047] The central magnetic structure 52 includes a central magnetic steel 521 and a central washer 522, the central magnetic steel 521 connects the central washer 522 and the yoke 51, and the central washer 522 is located on the side of the central magnetic steel 521 away from the yoke 51, and the side magnetic structure 53 includes a side washer 532 and a side magnetic steel 531, the side magnetic steel 531 connects the yoke 51 and the side washer 532, and the side washer 532 is located on the side of the side magnetic steel 531 away from the yoke 51, and the side washer 532 is connected to the basin frame 1.

[0048] When the magnetic pole of one end of the central magnetic steel 521 close to the diaphragm assembly is the N pole, the magnetic pole of one end of the permanent magnet 9 close to the yoke 51 is the N pole. When the magnetic pole of one end of the central magnetic steel 521 close to the diaphragm assembly is the S pole, the magnetic pole of one end of the permanent magnet 9 close to the yoke 51 is the S pole.

[0049] In order to balance the force on the diaphragm assembly, the plurality of electromagnet assemblies 6 and the plurality of permanent magnets form a planar symmetrical structure, and preferably the sound-emitting unit is a planar symmetrical structure.

[0050] In this embodiment, the number of the electromagnet components 6 is two, and the number of the permanent magnets 9 is three. In other embodiments, the number of the electromagnet components 6 can also be other numbers, which can be selected and set according to actual needs.

[0051] The top surface of the central magnetic structure 52 is provided with an avoidance groove 54 for avoiding the electromagnet assembly 6 and the permanent magnet 9, so that the electromagnet assembly 6 and / or the permanent magnet 9 can be prevented from accidentally colliding with the central magnetic structure 52 when the sound unit is working. It is further preferred that the avoidance groove 54 is connected to the top and bottom surfaces of the central washer 522, so that the central area of ​​the central magnetic steel 521 is not blocked by the central washer 522, so that the magnetic flux lines acting on the central magnetic steel 521 and the electromagnet assembly 6 can be more concentrated and dense, thereby improving the moving iron mechanism, and then increasing the total driving force of the sound unit to a greater extent.

[0052] In other embodiments, it is also acceptable that a portion of the avoidance groove 54 is located on the central washer 522 and another portion is located on the central magnetic steel 521 .

[0053] In this embodiment, the diaphragm assembly includes a sound membrane 2 and a center sticker 3, the sound membrane 2 includes an inner fixed part, a folded ring part and an outer fixed part which are connected in sequence from the inside to the outside, the outer fixed part is connected to the basin frame 1, and a window is provided on the inner fixed part. The center sticker 3 is connected to the inner fixed part and closes the window, and the electromagnet assembly 6 and the permanent magnet 9 are respectively arranged on the center sticker 3.

[0054] As a preferred embodiment, the center sticker 3 is located on the side of the inner fixed portion away from the yoke 51, so that the distance between the central magnetic structure 52 and the electromagnet assembly 6 / permanent magnet 9 can be increased, so that the sound unit can achieve a larger amplitude, thereby improving the performance of the sound unit.

[0055] In order to allow the voice coil 4 to penetrate deeper into the magnetic gap, optionally, the sound unit further includes a skeleton 7, and the voice coil 4 is indirectly connected to the diaphragm assembly through the skeleton 7. In this embodiment, the skeleton 7 is in the shape of a ring frame as a whole, which not only ensures the structural strength of the skeleton 7 itself, but also facilitates the assembly and manufacturing of the sound unit.

[0056] In order to improve the polarization and rolling phenomena of the voice coil 4, the sound unit also includes a supporting component, which connects the basin frame 1 and the voice coil 4. The supporting component includes a centering support plate 8 and / or a secondary membrane. When the supporting component includes a centering support plate 8, the sound unit can use the centering support plate 8 to power the voice coil 4.

[0057] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sound unit, characterized in that: include basin stand; A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame; A voice coil connected to the diaphragm assembly; A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and the magnetic circuit assembly has a magnetic gap for the voice coil to move; A plurality of electromagnet assemblies, wherein the electromagnet assemblies are arranged on a side of the diaphragm assembly close to the yoke and corresponding to a central area of ​​the central magnetic structure, and the electromagnet assemblies include a soft magnetic body and a coil arranged around the soft magnetic body; A plurality of permanent magnets are arranged in a row, the permanent magnets are arranged on a side of the diaphragm assembly close to the yoke and corresponding to the central area of ​​the central magnetic structure, the electromagnet assembly is correspondingly arranged between two adjacent permanent magnets, and the magnetic pole polarity of one end of the permanent magnet close to the central magnetic structure is the same as the magnetic pole polarity of one end of the central magnetic structure close to the diaphragm assembly.

2. The sound generating unit according to claim 1, characterized in that: The plurality of electromagnet assemblies and the plurality of permanent magnets form a planar symmetrical structure.

3. The sound generating unit according to claim 1, characterized in that: The number of the electromagnet assemblies is two, and the number of the permanent magnets is three.

4. The sound generating unit according to claim 1, characterized in that: The diaphragm assembly includes a sound membrane and a middle sticker, the sound membrane includes an inner fixing part, a folding ring part and an outer fixing part which are connected in sequence from the inside to the outside, the outer fixing part is connected to the basin frame, the inner fixing part is provided with a window, the middle sticker is connected to the inner fixing part and closes the window, and the electromagnet assembly and the permanent magnet are arranged on the middle sticker.

5. The sound generating unit according to claim 4, characterized in that: The middle sticker is located at a side of the inner fixing portion away from the yoke.

6. The sound generating unit according to claim 1, characterized in that: It also includes a frame, and the voice coil is indirectly connected to the diaphragm assembly through the frame.

7. The sound generating unit according to claim 6, characterized in that: The skeleton is in the shape of a rectangular frame as a whole.

8. The sound generating unit according to claim 1, characterized in that: The top surface of the central magnetic structure is provided with an avoidance groove for avoiding the electromagnet assembly and the permanent magnet.

9. The sound generating unit according to claim 8, characterized in that: The central magnetic structure includes a central magnetic steel and a central washer, the central magnetic steel connects the central washer and the yoke, and the avoidance groove connects the top surface and the bottom surface of the central washer.

10. The sound generating unit according to claim 9, characterized in that: A portion of the avoidance groove is located on the central washer, and another portion is located on the central magnetic steel.

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