Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a vibration assembly and a magnetic circuit assembly, the vibration assembly comprises a basin frame, a vibrating diaphragm assembly and a voice coil, and the vibrating diaphragm assembly is connected with the basin frame and the voice coil; the magnetic circuit assembly comprises a yoke and an edge magnetic assembly, the edge magnetic assembly comprises a lower magnet and an upper magnet which are connected, the magnetic poles of the lower magnet and the upper magnet repel each other, the lower magnet is located below the upper magnet and connected with the yoke, the upper magnet is connected with the basin frame, and the lower magnet is an elastic magnet. The miniature loudspeaker is novel in structure and small in self-vibration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transducer, in particular to a micro speaker. BACKGROUND

[0002] Nowadays, mobile terminals such as mobile phones and tablet computers enrich people's life, and electro-acoustic transducers play an indispensable role in various mobile terminals as audio devices. With the increasing demand of consumers for sound loudness, the performance requirements of electro-acoustic transducers are also increasing. When the micro speaker is powered on, the voice coil (coil) in the magnetic field has audio current passing through, which generates a magnetic field that changes with the audio current. This magnetic field interacts with the magnetic field of the permanent magnet, causing the voice coil to vibrate along the axial direction to produce sound. From the traditional micro speaker with an amplitude of 0.2mm to the master-level micro speaker with an amplitude of 0.65mm or more, the greater the amplitude of the diaphragm of the micro speaker, the more severe the self-vibration (jitter) of the micro speaker, resulting in higher noise or distortion. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a novel micro speaker with less self-vibration.

[0004] To solve the above technical problem, the technical solution adopted by the present application is as follows: a micro speaker comprising: a vibration assembly comprising a basket, a diaphragm assembly and a voice coil, the diaphragm assembly being connected to the basket and the voice coil; a magnetic circuit assembly comprising a yoke and a side magnet assembly, the side magnet assembly comprising a lower side magnet and an upper side magnet connected together, the lower side magnet and the upper side magnet repelling each other, the lower side magnet being located below the upper side magnet and connected to the yoke, the upper side magnet being connected to the basket, and the lower side magnet being an elastic magnet.

[0005] The beneficial effects of the present application are as follows: the novel micro speaker splits the integral side magnet steel into repelling upper and lower side magnets, and uses an elastic magnet as the lower side magnet. When the voice coil is powered on, the basket, the diaphragm assembly, the voice coil and the upper side magnet vibrate together. When the voice coil vibrates away from the yoke, the traction force of the upper side magnet away from the yoke is transmitted to the lower side magnet to be eliminated, thereby greatly reducing the traction force of the yoke towards the diaphragm assembly. When the voice coil vibrates towards the yoke, the pulling force of the basket towards the yoke is transmitted to the lower side magnet to be eliminated, thereby greatly reducing the pushing force of the yoke away from the diaphragm assembly. As a result, the driving force of the yoke towards or away from the diaphragm assembly is suppressed, thereby improving the self-vibration of the micro speaker, especially suitable for large-amplitude micro speakers. The repelling upper and lower side magnets can keep a certain bidirectional deformation allowance for the buffer layer. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 Structure diagram of the overall structure of the micro speaker; Figure 2 Sectional view of the micro speaker along the width direction; Figure 3 Sectional view of the micro speaker along the length direction; Figure 4 Structure diagram of the partial structure of the micro speaker Figure 1 ; Figure 5 Structure diagram of the partial structure of the micro speaker Figure 2 ; Explanation of the reference numerals: 1, vibration assembly; 11, basket; 12, diaphragm assembly; 13, voice coil; 2, magnetic circuit assembly; 21, yoke; 211, positioning groove; 22, center magnetic assembly; 221, center magnetic steel; 222, center dust shield; 23, edge magnetic assembly; 231, lower edge magnet; 232, upper edge magnet; 233, edge dust shield; 24, magnetic gap. DETAILED DESCRIPTION

[0007] To make the technical content, the achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0008] Please refer to Figures 1 to 4 , the micro speaker comprises: a vibration assembly 1 comprising a basket 11, a diaphragm assembly 12 and a voice coil 13, the diaphragm assembly 12 connecting the basket 11 and the voice coil 13; a magnetic circuit assembly 2 comprising a yoke 21 and an edge magnetic assembly 23, the edge magnetic assembly 23 comprising a lower edge magnet 231 and an upper edge magnet 232 connected together, the lower edge magnet 231 and the upper edge magnet 232 repelling each other, the lower edge magnet 231 being located below the upper edge magnet 232 and connecting the yoke 21, the upper edge magnet 232 connecting the basket 11, and the lower edge magnet 231 being an elastic magnet.

[0009] From the above description, the beneficial effects of the present application are that the novel structure of the micro speaker splits the integral edge magnet into repelling upper edge magnet 232 and lower edge magnet 231, and uses elastic magnet as the lower edge magnet 231, so that when the voice coil 13 is energized, the suspension 11, the diaphragm assembly 12, the voice coil 13 and the upper edge magnet 232 vibrate together, when the voice coil 13 vibrates away from the yoke 21, the traction force of the upper edge magnet 232 away from the yoke 21 is transmitted to the lower edge magnet 231 to be eliminated, thereby greatly reducing the traction force of the yoke 21 towards the diaphragm assembly 12, when the voice coil 13 vibrates towards the yoke 21, the pulling force of the suspension 11 towards the yoke 21 is transmitted to the lower edge magnet 231 to be eliminated, thereby greatly reducing the thrust of the yoke 21 away from the diaphragm assembly 12, thereby the driving force of the yoke 21 towards or away from the diaphragm assembly 12 is suppressed, and the self-vibration phenomenon of the micro speaker is improved, especially suitable for large-amplitude micro speakers; and the repelling upper edge magnet 232 and lower edge magnet 231 can keep a certain bidirectional deformation allowance of the buffer rubber layer.

[0010] Further, the elastic magnet is a rubber-based bonded magnet.

[0011] From the above description, the specific type of elastic magnet can be selected as needed.

[0012] Further, in the edge magnet assembly 23, the outer wall surface of the upper edge magnet 232 protrudes outward relative to the outer wall surface of the lower edge magnet 231, and / or the inner wall surface of the upper edge magnet 232 protrudes inward relative to the inner wall surface of the lower edge magnet 231.

[0013] From the above description, the lower edge magnet 231 has sufficient deformation allowance, and in the process of the upper edge magnet 232 approaching the yoke 21, the elastic magnet neither extends into the magnetic gap 24 to collide with the voice coil 13, nor expands outward to exceed the outer contour of the micro speaker.

[0014] Please refer to Figure 2 and Figure 5 Further, the yoke 21 is provided with a positioning groove 211 for positioning the lower edge magnet 231.

[0015] From the above description, the presence of the positioning groove 211 can facilitate the positioning and installation of the lower edge magnet 231, and is beneficial to ensuring the installation accuracy of the lower edge magnet 231.

[0016] Please refer to Figure 4 Further, the thickness of the upper edge magnet 232 and the thickness of the lower edge magnet 231 connected thereto are the same or different.

[0017] Please refer to Figure 4Further, the length of the upper edge magnet 232 is the same as or different from the length of the lower edge magnet 231 connected thereto.

[0018] Please refer to Figures 2 to 3 Further, the magnetic circuit assembly 2 further comprises a center magnetic assembly 22 arranged on the yoke 21, the center magnetic assembly 22 is in the shape of a rectangular body as a whole, and the four sides of the center magnetic assembly 22 are respectively provided with the edge magnetic assembly 23.

[0019] As can be known from the above description, the four sides of the basket 11 are each provided with a lower edge magnet 231, which is conducive to improving the structural stability of the micro speaker to a greater extent, reducing the risk of the upper edge magnet 232 accidentally separating from the lower edge magnet 231, and improving the performance of the micro speaker.

[0020] Please refer to Figure 2 and Figure 4 Further, the edge magnet assembly 23 further comprises an edge Hals 233, the edge Hals 233 is located above the upper edge magnet 232, and the edge Hals 233 is connected to the upper edge magnet 232 and / or the basket 11.

[0021] As can be known from the above description, the edge Hals 233 can guide the magnetic induction lines to the magnetic gap 24 of the magnetic circuit assembly 2, thereby improving the utilization rate of magnetic force.

[0022] Please refer to Figure 2 and Figure 4 Further, the basket 11 and the edge Hals 233 are in an integrated structure formed by integral processing.

[0023] Please refer to Figure 2 and Figure 4 Further, the basket 11 is a metal structural member, and the edge Hals 233 is formed by bending part of the area of the basket 11.

[0024] As can be known from the above description, the basket 11 and the edge Hals 233 are integrally processed and formed, which can facilitate the processing and manufacturing of the parts of the micro speaker.

[0025] Embodiment one of the present application is a micro speaker, which can be applied to electronic products such as mobile phones, tablet computers, smart watches, AR glasses, earphones, etc.

[0026] Please refer to Figures 1 to 4The micro-speaker comprises a vibration assembly 1 and a magnetic circuit assembly 2, the vibration assembly 1 comprises a frame 11, a diaphragm assembly 12 and a voice coil 13, the diaphragm assembly 12 connects the frame 11 and the voice coil 13, and the voice coil 13 is located in a hollow area of the frame 11; the magnetic circuit assembly 2 comprises a yoke 21, a center magnetic assembly 22 and a side magnetic assembly 23, the side magnetic assembly 23 comprises a lower side magnet 231 and an upper side magnet 232 connected with each other, the lower side magnet 231 and the upper side magnet 232 repel each other, the lower side magnet 231 is located below the upper side magnet 232 and connected with the yoke 21, the upper side magnet 232 is connected with the frame 11, the lower side magnet 231 is an elastic magnet, and the upper side magnet 232 is a magnetic steel; the center magnetic assembly 22 is arranged on the yoke 21 and forms a magnetic gap 24 for the voice coil 13 to move between the center magnetic assembly 22 and the upper side magnet 232, and the center magnetic assembly 22 is located between at least two side magnetic assemblies 23 arranged oppositely.

[0027] Please refer to Figure 2 When the end of the lower side magnet 231 away from the yoke 21 is an S pole, the end of the upper side magnet 232 above the lower side magnet 231 close to the yoke 21 is also an S pole, thereby forming a repelling effect; when the end of the lower side magnet 231 away from the yoke 21 is an N pole, the end of the upper side magnet 232 above the lower side magnet 231 close to the yoke 21 is also an N pole, thereby forming a repelling effect; the repelling upper side magnet 232 and the lower side magnet 231 can ensure that the elastic magnet has sufficient bidirectional deformation allowance.

[0028] The elastic magnet is a rubber-based bonded magnet, the bonded magnet is a composite magnet made of permanent magnetic powder and a bonding agent through an extrusion molding, a calender molding or an injection molding process, and the rubber-based bonded magnet uses rubber as the bonding agent.

[0029] Please refer to Figures 2 to 3 In the embodiment, the outer wall surface of the upper side magnet 232 is flush with the outer wall surface of the lower side magnet 231, and the inner wall surface of the upper side magnet 232 is flush with the inner wall surface of the lower side magnet 231. In other embodiments, in order to allow the lower side magnet 231 to have sufficient deformation allowance, the outer wall surface of the upper side magnet 232 protrudes outward relative to the outer wall surface of the lower side magnet 231, and / or the inner wall surface of the upper side magnet 232 protrudes inward relative to the inner wall surface of the lower side magnet 231.

[0030] Please refer to Figure 2 and Figure 5 In order to facilitate positioning and installation of the lower side magnet 231, in the embodiment, the yoke 21 is provided with a positioning groove 211 for positioning the lower side magnet 231.

[0031] The thickness of the upper edge magnet 232 and the thickness of the lower edge magnet 231 connected therewith are the same or different; the length of the upper edge magnet 232 and the length of the lower edge magnet 231 connected therewith are the same or different; the width of the upper edge magnet 232 and the width of the lower edge magnet 231 connected therewith are the same or different; and the actual needs can be selectively designed.

[0032] Please refer to Figure 2 The center magnetic assembly 22 includes a center magnetic steel 221 and a center dust core 222 located above the center magnetic steel 221, and the center magnetic steel 221 connects the center dust core 222 and the yoke 21. In this embodiment, the center magnetic assembly 22 is in the shape of a rectangular body as a whole, and the four sides of the center magnetic assembly 22 are respectively provided with the edge magnetic assembly 23.

[0033] Please refer to Figure 2 and Figure 4 Figure 4 The edge magnetic assembly 23 further includes an edge dust core 233, the edge dust core 233 is located above the upper edge magnet 232, and the edge dust core 233 connects the upper edge magnet 232 and / or the pot rack 11; the edge dust core 233 is aligned or nearly aligned with the center dust core 222.

[0034] In one or more embodiments, the pot rack 11 and the edge dust core 233 are integrally formed by, for example, a bending process or an insert injection molding process, etc. In this embodiment, the pot rack 11 is a metal structural member, and the edge dust core 233 is bent from part of the pot rack 11.

[0035] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings of the present application is also included in the patent protection scope of the present application.

Claims

1. A miniature loudspeaker, characterized in that, include A vibrating assembly, which includes a frame, a diaphragm assembly and a voice coil, wherein the diaphragm assembly connects the frame and the voice coil; A magnetic circuit assembly includes a yoke and a side magnetic assembly. The side magnetic assembly includes a lower side magnet and an upper side magnet connected together. The magnetic poles of the lower magnet and the upper magnet repel each other. The lower magnet is located below the upper magnet and connected to the yoke. The upper magnet is connected to the basket frame. The lower magnet is an elastic magnet.

2. The miniature loudspeaker according to claim 1, characterized in that, The elastic magnet is a rubber-based bonded magnet.

3. The miniature loudspeaker according to claim 1, characterized in that, In the edge magnet assembly, the outer wall surface of the upper magnet protrudes outward relative to the outer wall surface of the lower magnet, and / or, the inner wall surface of the upper magnet protrudes inward relative to the inner wall surface of the lower magnet.

4. The miniature loudspeaker according to claim 1, characterized in that, The yoke is provided with a positioning groove for positioning the lower magnet.

5. The miniature loudspeaker according to claim 1, characterized in that, The thickness of the upper magnet and the thickness of the lower magnet connected to it may be the same or different.

6. The miniature loudspeaker according to claim 1, characterized in that, The length of the upper magnet may be the same as or different from the length of the lower magnet connected to it.

7. The miniature loudspeaker according to claim 1, characterized in that, The magnetic circuit assembly also includes a central magnetic assembly disposed on the yoke. The central magnetic assembly is rectangular in shape, and the side magnetic assemblies are disposed on the four sides of the central magnetic assembly.

8. The miniature loudspeaker according to claim 1, characterized in that, The side magnet assembly also includes a side washer located above the upper side magnet, and the side washer connects the upper magnet and / or the basin stand.

9. The miniature loudspeaker according to claim 8, characterized in that, The basin stand and the side washer are integrally formed into a single structure.

10. The miniature loudspeaker according to claim 9, characterized in that, The basin stand is a metal structural component, and the side washer is formed by bending a portion of the basin stand.

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