CN220254673U - Sound generating unit and wearable electronic product - Google Patents

Abstract

The utility model discloses a sound generating unit. The sounding unit comprises a shell, an elastic sheet, a voice coil and a magnetic circuit forming assembly; the magnetic circuit forming assembly comprises a first magnetic circuit forming assembly comprising a first inner annular magnet and a first outer annular magnet concentrically arranged; the first inner annular magnet and the first outer annular magnet are magnetized in the radial direction, and the polarity of the radial outer magnetic pole of the first inner annular magnet is opposite to that of the radial inner magnetic pole of the first outer annular magnet; and the voice coil is located between the first inner annular magnet and the first outer annular magnet. In addition, the utility model also discloses a wearable electronic product with the sounding unit.

Description

Sound generating unit and wearable electronic product

Technical Field

The present utility model relates to the field of acoustic electronic products, and in particular, to a sound generating unit and a wearable electronic product having the same.

Background

With the development of technology, more and more electronic products are miniaturized. For example, wearable electronics such as headphones, there is an increasing demand for miniaturization of sound units.

The driven vibration sound unit generally includes a magnet and a magnetically conductive member, and a substantially radial magnetic field is formed by the magnetically conductive member and the magnet, so that the voice coil vibrates under the magnetic force in the magnetic field. However, the intensity of the magnetic field generated by the magnetic conductive member is weak, which has an adverse effect on the vibration performance of the sound generating unit, and the magnetic conductive member occupies a large space, which is disadvantageous for miniaturization and thinning of the sound generating unit. In order to increase the magnetic field strength and improve the performance of the sound generating unit, it is common practice to use a magnet with larger volume and stronger magnetic force, and the result of this practice is also unfavorable for miniaturization and thinning of the sound generating unit product.

Therefore, two problems are faced at present, namely, how to reduce the size of the product as much as possible on the premise of keeping the performance of the sounding unit; and secondly, how to improve the sounding characteristics and performance of the sounding unit as much as possible under the existing size condition.

Disclosure of Invention

In order to solve or alleviate at least some of the above problems, the present utility model proposes a new sound generating unit structure.

According to one aspect of the present utility model, a sound emitting unit is provided.

According to an exemplary embodiment, the sound generating unit includes a housing, a spring plate, a voice coil, and a magnetic circuit forming assembly. The magnetic circuit forming assembly comprises a first magnetic circuit forming assembly comprising a first inner annular magnet and a first outer annular magnet concentrically arranged; the first inner annular magnet and the first outer annular magnet are magnetized in the radial direction, and the polarity of the radial outer magnetic pole of the first inner annular magnet is opposite to that of the radial inner magnetic pole of the first outer annular magnet; and the voice coil is located between the first inner annular magnet and the first outer annular magnet.

According to another exemplary embodiment, the magnetic circuit forming assembly further comprises a second magnetic circuit forming assembly comprising a second inner annular magnet and a second outer annular magnet arranged concentrically, both of which are axially magnetized and of opposite polarity; and the second magnetic circuit forming assembly is arranged at one axial side of the first magnetic circuit forming assembly, so that the magnetic field formed by the second magnetic circuit forming assembly and the magnetic field formed by the first magnetic circuit forming assembly are overlapped at the voice coil.

According to yet another exemplary embodiment, the magnetic circuit forming assembly further comprises a third magnetic circuit forming assembly comprising a third inner annular magnet and a third outer annular magnet arranged concentrically, both of which are axially magnetized and of opposite polarity; and the third magnetic circuit forming assembly is arranged on the other axial side of the first inner annular magnet, so that the magnetic field formed by the third magnetic circuit forming assembly and the magnetic field formed by the first magnetic circuit forming assembly are overlapped at the voice coil.

According to yet another exemplary embodiment, the ratio of the thickness of the second magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:4 to 3:4, and the ratio of the thickness of the third magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:4 to 3:4. Preferably, the ratio of the thickness of the second magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:2, and the ratio of the thickness of the third magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:2.

According to still another exemplary embodiment, the elastic piece is fixed to an outer edge of the housing, and an accommodation space is formed between the elastic piece and the housing, and the magnetic circuit forming assembly and the voice coil are disposed in the accommodation space.

According to still another exemplary embodiment, the magnetic circuit forming assembly is fixed to the housing, and the voice coil is fixed to the elastic piece; or the magnetic circuit forming assembly is fixed on the elastic sheet, and the voice coil is fixed on the shell.

According to another aspect of the present utility model, there is provided a wearable electronic product comprising the sound emitting unit according to any of the preceding embodiments.

According to an exemplary embodiment, the wearable electronic product comprises a headset.

According to another exemplary embodiment, the earphone comprises a bone conduction earphone, the bone conduction earphone further comprising a vibrating plate fixed to the dome.

Drawings

Exemplary embodiments of the present utility model will be described below with reference to the following drawings, in which:

fig. 1 is a perspective view of a sound emitting unit according to an exemplary embodiment of the present utility model;

fig. 2 is an exploded perspective view of the sound emitting unit shown in fig. 1;

FIG. 3 is a cross-sectional view of a sound emitting unit according to an exemplary embodiment of the present utility model;

fig. 4 is a cross-sectional view of a sound emitting unit according to another exemplary embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, one or more embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

It should be appreciated that in this specification, terms of orientation, direction or positional relationship such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation unless specifically stated otherwise herein.

The prefixes "first", "second", etc. of technical features are merely used to distinguish different individuals of the same kind of technical features, and do not imply importance or order between them, and may have different configurations according to the specific embodiments.

According to one aspect of the present utility model, a sound emitting unit is disclosed.

First embodiment

Fig. 1 to 3 show a sound emitting unit 100 according to an exemplary first embodiment of the present utility model. As shown, the sound generating unit 100 includes a housing 110, a spring plate 140, a voice coil 130, and a magnetic circuit forming assembly 120. In one embodiment, the magnetic circuit forming assembly 120 may include a first magnetic circuit forming assembly 121, the first magnetic circuit forming assembly 121 including a first inner annular magnet 1211 and a first outer annular magnet 1212 that are concentrically disposed. As shown in fig. 3, both the first inner annular magnet 1211 and the first outer annular magnet 1212 are radially magnetized (radially magnetized), and the magnetic pole of the radially outer side of the first inner annular magnet 1211 is opposite to the magnetic pole of the radially inner side of the first outer annular magnet 1212. The voice coil 130 is disposed between the first inner annular magnet 1211 and the first outer annular magnet 1212.

In this embodiment, by providing the first inner annular magnet 1211 and the first outer annular magnet 1212 that are radially magnetized, a radial magnetic field can be directly formed at the outer peripheral surface of the first inner annular magnet 1211 and the inner peripheral surface of the first outer annular magnet 1212 without using a conventional magnetic conductive member. This can avoid the magnetic loss caused by the use of the magnetically conductive member, and the magnetic field intensity is higher, and at the same time, the increase in the size of the sound generating unit caused by the use of the magnetically conductive member can be avoided. Through the technical scheme of the embodiment, the axial size of the sounding unit can be obviously reduced, and the sounding unit is beneficial to being used in various miniaturized devices.

Second embodiment

As shown in fig. 3, in the exemplary second embodiment, the magnetic circuit forming assembly 120 may further include a second magnetic circuit forming assembly 122 on the basis of the structure defined in the first embodiment. The second magnetic circuit forming assembly 122 includes a second inner annular magnet 1221 and a second outer annular magnet 1222 that are concentrically arranged, the second inner annular magnet 1221 and the second outer annular magnet 1222 being both axially magnetized and of opposite polarity. The second magnetic circuit forming assembly 122 is disposed at one side (upper side shown in fig. 3) of the first magnetic circuit forming assembly 121 in the axial direction such that the magnetic field formed by the second magnetic circuit forming assembly 122 is superimposed with the magnetic field formed by the first magnetic circuit forming assembly 121 at the voice coil 130.

It should be noted that "superposition" as used herein refers to that two or more magnetic fields have the same or substantially the same magnetic field direction at a specific location, so that the magnetic fields are superimposed on each other so that the total magnetic field strength at that location is increased. If the magnetic field directions of the magnetic fields at the location are opposite or substantially opposite, a situation may occur in which the magnetic fields "cancel" each other out, resulting in a decrease in the total magnetic field strength at the location.

Those skilled in the art, based on the description of the structural principles of the present utility model in this specification, can easily set the poles of the individual magnets to achieve the desired magnetic field "superposition" effect of the present utility model. Fig. 3 illustrates an exemplary embodiment. In this embodiment, only the arrangement of the poles of the magnet portion on the left side of the figure is illustrated, and the right side is based on similar principles as will be readily understood by those skilled in the art.

In fig. 3, the radially outer side of the first inner annular magnet 1211 is an S-pole, the radially inner side is an N-pole, the radially inner side of the first outer annular magnet 1212 is an N-pole (opposite in polarity to the radially outer side of the first inner annular magnet 1211), and the radially outer side is an S-pole. Thus, a radially inwardly directed magnetic field (illustrated as a horizontally rightward directed arrow, hereinafter referred to as "first magnetic field") is formed between the first inner annular magnet 1211 and the first outer annular magnet 1212.

The axial side of the second inner annular magnet 1221 facing the first inner annular magnet 1211 is the S-pole, and the axial side facing away from the first inner annular magnet 1211 is the N-pole; the second outer annular magnet 1222 has an N-pole facing the axial side of the first outer annular magnet 1212 and an S-pole facing away from the axial side of the first outer annular magnet 1211. In this case, the second magnetic path forming member 122 forms a substantially annular magnetic field (hereinafter referred to as "second magnetic field") in the cross section shown in fig. 3, as indicated by arrows which sequentially meet in four directions at the upper left side of fig. 3. The lower part of the second magnetic field is the same as the magnetic force line direction of the first magnetic field at the position of the voice coil 130, so that the two magnetic fields are overlapped, and the magnetic field strength at the position of the voice coil 130 is improved.

Specifically, the voice coil generally includes a voice coil body and a coil wound around the voice coil body, and a portion of the voice coil around which the coil is wound is positioned in a magnetic field and receives a magnetic field force after being energized. Since the coil is typically wound around only a small portion of the voice coil body, it is advantageous to increase the magnetic field strength at the location of the voice coil, thereby increasing the magnetic force experienced by the voice coil. In the present embodiment, the magnetic field formed by the second magnetic circuit forming assembly 122 is superimposed at the magnetic field formed by the first magnetic circuit forming assembly 121, so that the magnetic field strength at the voice coil is improved, and the transient response characteristic of the sound generating unit is improved.

When the magnetizing directions of the first inner annular magnet 1211 and the first outer annular magnet 1212 are changed, the magnetic pole directions of the second inner annular magnet 1221 and the second outer annular magnet 1222 need only be adjusted accordingly to achieve the object of the present utility model. These changes and corresponding adaptations are readily understood by those skilled in the art and will not be described in detail.

Third embodiment

As shown in fig. 3, in the exemplary third embodiment, the magnetic circuit forming assembly 120 may further include a third magnetic circuit forming assembly 123 on the basis of the structure defined in the second embodiment. The third magnetic circuit forming assembly 123 includes a third inner annular magnet 1231 and a third outer annular magnet 1232 arranged concentrically, the third inner annular magnet 1231 and the third outer annular magnet 1232 being both axially magnetized and of opposite polarity. The third magnetic circuit forming assembly is disposed at the other axial side (lower side shown in fig. 3) of the first magnetic circuit forming assembly such that the magnetic field formed by the third magnetic circuit forming assembly 123 and the magnetic field formed by the first magnetic circuit forming assembly 121 are superimposed at the voice coil 130.

In an exemplary embodiment, as shown in fig. 3, the axial side of the third inner annular magnet 1231 facing the first inner annular magnet 1211 is the S-pole and the axial side facing away from the first inner annular magnet 1211 is the N-pole; the axial side of the third outer annular magnet 1232 facing the first outer annular magnet 1212 is N-pole and the axial side facing away from the first outer annular magnet 1211 is S-pole. In this case, the third magnetic path forming member 123 forms a substantially annular magnetic field (hereinafter referred to as "third magnetic field") in the cross section shown in fig. 3, as indicated by arrows that sequentially meet in four directions at the lower left side of fig. 3. The upper part of the third magnetic field is the same as the magnetic force line direction of the first magnetic field at the position of the voice coil 130, so that the magnetic fields are overlapped, and the magnetic field strength at the voice coil 130 is further improved.

Similarly, when the magnetizing directions of the first inner annular magnet 1211 and the first outer annular magnet 1212 are changed, the object of the present utility model can be achieved by merely adjusting the magnetic pole directions of the third inner annular magnet 1231 and the third outer annular magnet 1232 accordingly. These will be readily understood by those skilled in the art and the text will not be repeated.

According to the second or third embodiment, the magnetic conductive member in the existing sound generating unit can be replaced with an additional magnetic circuit forming assembly, so that the product performance of the sound generating unit can be further provided without changing the existing size.

In addition, the inventor of the present application found through experimental study that, although the thickness of the second magnetic circuit forming assembly and/or the third magnetic circuit forming assembly can be increased correspondingly, the magnetic field strength at the voice coil 130 is not increased efficiently due to the more dispersed magnetic field, which is not beneficial to the thinning of the sound generating unit. When the thickness of the second magnetic circuit forming member and/or the third magnetic circuit forming member is small, the strength of the magnetic field superimposed at the voice coil 130 is too low. Therefore, in general, in the case of using the same magnet material, it is advantageous to set the thickness of the second magnetic circuit forming member and the third magnetic circuit forming member to 1/4 to 3/4 of the thickness of the first magnetic circuit forming member, and more preferably to half the thickness of the first magnetic circuit forming member. Therefore, the magnetic field intensity near the voice coil can be effectively improved, and unreasonable increase of the overall axial size of the sound generating unit can be avoided.

As shown in fig. 3, the elastic piece 140 is fixed to the outer edge of the housing 110, and an accommodating space is formed between the elastic piece 140 and the housing 110, in which the magnetic circuit forming assembly 120 and the voice coil 130 are disposed.

In one embodiment, the magnetic circuit forming assembly may be fixedly connected to the spring plate 140 and the voice coil 130 is fixedly connected to the housing 110. In this embodiment, after energizing, the voice coil remains stationary and the magnetic circuit forming assembly vibrates with the spring. In another embodiment, as shown in fig. 4, the magnetic circuit forming assembly 120 may be fixedly connected to the housing 110, and the voice coil 130 is fixedly connected to the elastic piece 140. In this embodiment, after the energization, the magnetic circuit forming assembly remains stationary, and the voice coil vibrates with the spring piece.

The "annular" described in the present specification is not limited to the "annular" shown in the drawings corresponding to the embodiment of the present utility model, and may include any of the shapes such as "square annular", "rectangular annular", "elliptical annular", and "racetrack annular" existing in the prior art. The specific shape of the sound generating unit may be related to the requirements of the device in which it is used, but in any event, those skilled in the art will appreciate that these shape variations do not affect the implementation of the solution of the present utility model. The spring plate may take any shape or configuration feasible in the prior art, as long as it can realize elastic vibration under the action of magnetic force, not the specific configuration shown in the drawings of the present utility model. The magnets in the magnetic circuit forming assembly may be natural permanent magnets or various artificial permanent magnets.

According to another aspect of the utility model, a wearable electronic product (not shown) is disclosed, comprising a sound emitting unit according to any of the previous embodiments. The wearable device may be, for example, smart glasses, VR headset, earphone, smart watch, smart bracelet, etc.

In a particular embodiment, the wearable electronic product is a headset, in particular a bone conduction headset. Bone conduction is a sound conduction mode, i.e. converting sound into mechanical vibrations of different frequencies, transmitting sound waves through the skull, bone labyrinth, inner ear lymph, screw, auditory center of a person. In order to achieve a sound transmission manner of bone conduction, the sound generating unit according to the present utility model further includes a vibration plate 150 fixed to the elastic sheet. The vibration plate 150 is adapted to be attached (directly or via a headset housing) to the surface of the user's skull bone to transfer vibrations to the user's skull bone. In some embodiments, the vibration plate 150 may be connected to the spring plate 140 via a connection ring 160.

While the preferred embodiments of the present utility model have been described by way of example in the foregoing description, it should be appreciated that numerous modifications or variations to the embodiments disclosed herein, or obvious combinations and substitutions of features, will be apparent to those skilled in the art based on the teachings of the present utility model. Therefore, the scope of the utility model should not be limited to the specific embodiments disclosed in this specification. The protection scope of the present utility model should be determined by the technical scheme defined in the claims and the equivalent technical scheme thereof.

Claims (10)

1. The utility model provides a sound generating unit, includes casing, shell fragment, voice coil loudspeaker voice coil and magnetic circuit formation subassembly, its characterized in that:

the magnetic circuit forming assembly comprises a first magnetic circuit forming assembly comprising a first inner annular magnet and a first outer annular magnet concentrically arranged;

the first inner annular magnet and the first outer annular magnet are magnetized in the radial direction, and the polarity of the radial outer magnetic pole of the first inner annular magnet is opposite to that of the radial inner magnetic pole of the first outer annular magnet; and is also provided with

The voice coil is located between the first inner annular magnet and the first outer annular magnet.

2. The sound emitting unit of claim 1, wherein:

the magnetic circuit forming assembly further comprises a second magnetic circuit forming assembly comprising a second inner annular magnet and a second outer annular magnet which are concentrically arranged, wherein the second inner annular magnet and the second outer annular magnet are axially magnetized and have opposite polarities; and is also provided with

The second magnetic circuit forming assembly is arranged on one axial side of the first magnetic circuit forming assembly, so that a magnetic field formed by the second magnetic circuit forming assembly and a magnetic field formed by the first magnetic circuit forming assembly are overlapped at the voice coil.

3. The sound emitting unit of claim 2, wherein:

the magnetic circuit forming assembly further comprises a third magnetic circuit forming assembly, wherein the third magnetic circuit forming assembly comprises a third inner annular magnet and a third outer annular magnet which are concentrically arranged, and the third inner annular magnet and the third outer annular magnet are axially magnetized and have opposite polarities; and is also provided with

The third magnetic circuit forming assembly is arranged on the other axial side of the first inner annular magnet, so that a magnetic field formed by the third magnetic circuit forming assembly and a magnetic field formed by the first magnetic circuit forming assembly are overlapped at the voice coil.

4. A sound generating unit according to claim 3, characterized in that:

the ratio of the thickness of the second magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:4-3:4, and the ratio of the thickness of the third magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:4-3:4.

5. The sound emitting unit of claim 4, wherein:

the ratio of the thickness of the second magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:2, and the ratio of the thickness of the third magnetic circuit forming assembly to the thickness of the first magnetic circuit forming assembly is 1:2.

6. The sound emitting unit of any one of claims 1 to 5, wherein:

the elastic sheet is fixed to the outer edge of the housing, an accommodating space is formed between the elastic sheet and the housing, and the magnetic circuit forming assembly and the voice coil are disposed in the accommodating space.

7. The sound emitting unit of claim 6, wherein:

the magnetic circuit forming assembly is fixed on the shell, and the voice coil is fixed on the elastic sheet; or alternatively

The magnetic circuit forming assembly is fixed to the elastic sheet, and the voice coil is fixed to the housing.

8. A wearable electronic product, characterized in that it comprises the sound emitting unit of any one of claims 1 to 7.

9. The wearable electronic product of claim 8, wherein the wearable electronic product comprises an earpiece.

10. The wearable electronic product of claim 9, wherein the earpiece comprises a bone conduction earpiece, the bone conduction earpiece further comprising a vibrating plate secured to the dome.