A micro speaker

Abstract

The application discloses a micro loudspeaker, which comprises a loudspeaker unit and at least one electromagnet assembly arranged outside the loudspeaker unit, and the electromagnet assembly is used for enhancing or weakening the local magnetic field intensity of the magnetic circuit system of the loudspeaker unit. The electromagnet assembly is arranged outside the loudspeaker unit, the polarity and magnetic force of the electromagnet assembly are adjusted, the BL driving force distribution of the vibration assembly of the micro loudspeaker is changed, the vibration state of the vibration assembly is changed, the purpose of correcting the swing of the vibration assembly is achieved, the micro loudspeaker can normally and stably work, the noise of the micro loudspeaker during work is avoided, and the acoustic performance of the micro loudspeaker is ensured.

Description

TECHNICAL FIELD

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

[0002] At present, the micro speaker and receiver in mobile terminal may occasionally produce machine noise when working, for example, the audio file rich in low frequency components such as piano music noise, drum sound and bass may produce abnormal sound when playing, and the female voice may produce broken sound under high voltage.

[0003] Such noise or abnormal sound, broken sound is usually caused by the distortion frequency component of the vibration assembly swing when the speaker or speaker module is working, or the noise caused by the vibration assembly colliding with the magnetic circuit system.

[0004] Such phenomenon is more common in the machine earphone and speaker module, because the roll vibration / swing is mainly caused by insufficient constraint degree of the suspension device of the vibration assembly, asymmetric driving force caused by process technology of the magnetic circuit part and asymmetric acoustic resistance, and there is no correction measure for correcting the vibration assembly in the existing micro speaker, and once the vibration assembly occurs roll vibration / swing, there is no way to make up for it. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a micro speaker capable of correcting the swing of the vibration assembly.

[0006] In order to solve the above technical problem, the technical scheme adopted by the present application is as follows: a micro speaker, comprising a speaker unit, further comprising at least one electromagnet assembly arranged outside the speaker unit, the electromagnet assembly is used to enhance or weaken the local magnetic field intensity of the magnetic circuit system of the speaker unit.

[0007] The beneficial effects of the present application are as follows: the electromagnet assembly is arranged outside the speaker unit, the polarity and magnetic force of the electromagnet assembly can be adjusted to change the BL driving force distribution of the vibration assembly of the micro speaker, so as to change the vibration state of the vibration assembly, achieve the purpose of correcting the swing of the vibration assembly, ensure that the micro speaker can work normally and stably, thereby avoiding the noise of the micro speaker when working, and being beneficial to ensuring the acoustic performance of the micro speaker. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 It is an exploded view of the micro speaker of the first embodiment of the present application;

[0009] Fig. 2 It is a sectional view of the micro speaker of the first embodiment of the present application;

[0010] Fig. 3 It is a sectional view of another structure of the micro speaker of the first embodiment of the present application.

[0011] Brief description of the drawings

[0012] 1. loudspeaker unit;

[0013] 2. magnetic gap;

[0014] 3. electromagnet assembly;

[0015] 4. magnetic bowl;

[0016] 5. diaphragm;

[0017] 6. support;

[0018] 7. accommodating hole;

[0019] 8. circuit board;

[0020] 9. limiting groove;

[0021] 10. core;

[0022] 11. coil;

[0023] 12. ball top. DETAILED DESCRIPTION

[0024] To make the technical contents, purposes and effects of the present application clear, the following will be described in combination with the embodiments and the drawings.

[0025] The most key idea of the present application is that the distribution of BL driving force of the vibrating assembly on the loudspeaker unit is changed by controlling the electromagnet assembly located outside the loudspeaker unit, so that the vibrating assembly is corrected, and the acoustic performance of the micro loudspeaker is ensured.

[0026] Please refer to Figs. 1 to 3 A micro loudspeaker comprises a loudspeaker unit 1, and at least one electromagnet assembly 3 arranged outside the loudspeaker unit 1, wherein the electromagnet assembly 3 is used to enhance or weaken the local magnetic field intensity of the magnetic circuit system of the loudspeaker unit 1.

[0027] From the above description, it can be seen that the present application has the following beneficial effects: the electromagnet assembly 3 is arranged outside the loudspeaker unit 1, and the distribution of BL driving force of the vibrating assembly of the micro loudspeaker can be changed by adjusting the polarity and magnetic force of the electromagnet assembly, so that the vibration state of the vibrating assembly is changed, the purpose of correcting the swinging condition of the vibrating assembly is achieved, the micro loudspeaker can work normally and stably, and the acoustic performance of the micro loudspeaker is ensured.

[0028] Further, the micro loudspeaker further comprises a support 6, wherein the support 6 is provided with an accommodating hole 7 for accommodating the electromagnet assembly 3.

[0029] Further, the bracket 6 is connected to the speaker unit 1.

[0030] As can be seen from the above description, the bracket 6 can be used to protect the electromagnet assembly 3 and provide a mounting position for the electromagnet assembly 3.

[0031] Further, the speaker unit 1 has a magnetic gap 2, and the electromagnet assembly 3 is arranged corresponding to the magnetic gap 2.

[0032] Further, the speaker unit 1 includes a diaphragm 5, and the electromagnet assembly 3 is located on a side of the diaphragm 5 away from the magnetic gap 2.

[0033] As can be seen from the above description, the electromagnet assembly 3 can be arranged at the top of the speaker unit 1.

[0034] Further, the speaker unit 1 includes a magnetic bowl 4, and the electromagnet assembly 3 is located on a side of the magnetic bowl 4 away from the magnetic gap 2.

[0035] As can be seen from the above description, the electromagnet assembly 3 can be arranged at the bottom of the speaker unit 1.

[0036] Further, the electromagnet assembly 3 includes an iron core 10 and a coil 11 wound around the iron core 10, and the iron core 10 is connected to the magnetic bowl 4.

[0037] As can be seen from the above description, the electromagnet assembly 3 has a simple structure and is easy to manufacture.

[0038] Further, the magnetic bowl 4 is integrally formed with the iron core 10.

[0039] Further, the magnetic bowl 4 is connected to the iron core 10 by gluing, buckling, screwing or screwing.

[0040] As can be seen from the above description, the iron core 10 and the magnetic bowl 4 can be connected in various ways, and manufacturers can choose and set according to actual needs.

[0041] Further, the number of electromagnet assemblies 3 is greater than or equal to four, and the four corners of the magnetic gap 2 are respectively provided with the electromagnet assemblies 3, or the four edges of the magnetic gap 2 are respectively provided with the electromagnet assemblies 3.

[0042] As can be seen from the above description, the plurality of electromagnet assemblies 3 are reasonably distributed, and can correct the swing of the vibration assembly in various directions.

[0043] Further, it also includes a controller and a swing monitoring device, and the controller is electrically connected to the swing monitoring device and the electromagnet assembly 3.

[0044] From the above description, the vibration assembly of the micro speaker can be corrected in real time, further ensuring the acoustic performance of the micro speaker.

[0045] Embodiment one

[0046] Please refer to Figs. 1 to 3 , the embodiment one of the present application is: please combine Fig. 1 and Fig. 2 , a micro speaker, comprising a shell (not shown in the figure) and a speaker unit 1 arranged in the shell, the speaker unit 1 has a magnetic gap 2, further comprising at least one electromagnet assembly 3 arranged outside the speaker unit 1, the electromagnet assembly 3 is used to enhance or weaken the local magnetic field intensity of the magnetic circuit system of the speaker unit 1, preferably the electromagnet assembly 3 is arranged corresponding to the magnetic gap 2, the electromagnet assembly 3 is connected on the speaker unit 1 or the inner side wall of the shell. It should be noted that the arrangement of the electromagnet assembly 3 corresponding to the magnetic gap 2 includes three cases, one, when projected along the height direction of the magnetic gap 2, the originally annular magnetic gap 2 is blocked by the electromagnet assembly 3 to form an open ring; two, when projected along the height direction of the magnetic gap 2, the inside or outside of the originally annular magnetic gap 2 forms an aperture, that is, a part of the electromagnet assembly 3 is located in the magnetic gap 2 region but does not block the magnetic gap 2; three, when projected along the height direction of the magnetic gap 2, the electromagnet assembly 3 is located on the inside or outside of the corresponding ring of the magnetic gap 2, that is, the electromagnet assembly 3 has no overlapping area with the magnetic gap 2, at this time, the electromagnet assembly 3 is only arranged close to the magnetic gap 2. In addition, in other embodiments, the electromagnet assembly 3 can also be arranged around the speaker unit 1 and close to the side magnetic steel in the speaker unit 1, such arrangement can also change the local magnetic field intensity of the magnetic circuit system of the speaker unit 1, so as to achieve the purpose of improving the swing of the vibration assembly of the speaker unit 1.

[0047] It is easy to understand that when the swing mode of the vibration assembly of the micro speaker is single and consistent, the number of the electromagnet assembly 3 can be one. For example, there is a probability of nearly 100% that the vibration assembly in a certain speaker unit 1 is biased to one side of the short axis of the magnetic gap 2, then a certain direction of electromagnetic force is applied on the one side or a reverse polarity of electromagnetic force is applied on the corresponding side of the one side, so as to correct this kind of swing.

[0048] The speaker unit 1 comprises a magnetic bowl 4 and a diaphragm 5, the electromagnet assembly 3 is located on the side of the magnetic bowl 4 away from the magnetic gap 2, or the electromagnet assembly 3 is located on the side of the diaphragm 5 away from the magnetic gap 2.

[0049] The micro loudspeaker further comprises a support 6 arranged in the shell, the support 6 is provided with a receiving hole 7 for accommodating the electromagnet assembly 3, the support 6 is connected to the loudspeaker unit 1 or the shell, in order to provide sufficient protection for the electromagnet assembly 3, the depth of the receiving hole 7 is greater than the height of the electromagnet assembly 3, preferably the thickness of the support 6 is greater than the height of the electromagnet assembly 3. The support 6 is provided with a conductive circuit connected to the electromagnet assembly 3, and further preferably, the support 6 is provided with a circuit board 8, the conductive circuit is arranged on the circuit board 8, and the circuit board 8 includes but is not limited to an FPC board and a PCB board. In detail, the support 6 is further provided with a limiting groove 9 matched with the circuit board 8.

[0050] Specifically, the electromagnet assembly 3 comprises an iron core 10 and a coil 11 wound around the iron core 10, and the iron core 10 is connected to the magnetic bowl 4. Optionally, as shown in Fig. 3 , the magnetic bowl 4 is integrally formed with the iron core 10, and the processing method of integrally forming the magnetic bowl 4 with the iron core 10 includes but is not limited to milling forming, stamping forming and the like; or, as shown in Fig. 2 , the magnetic bowl 4 is connected to the iron core 10 by gluing, buckling, screwing or screwing.

[0051] Further, the number of the electromagnet assemblies 3 is greater than or equal to four, and the four corners of the magnetic gap 2 are respectively provided with the electromagnet assemblies 3, or the four edges of the magnetic gap 2 are respectively provided with the electromagnet assemblies 3. In this embodiment, the number of the electromagnet assemblies 3 is four, and the four electromagnet assemblies 3 are arranged one by one corresponding to the four edges of the magnetic gap 2 (i.e. two long axes and two short axes of the magnetic gap 2). The number of the electromagnet assemblies 3 is large and reasonably distributed, which can realize "digital" correction to complex and variable roll vibration modes.

[0052] It should be noted that the micro speaker can correct the vibration assembly before leaving the factory or in real time during use. In detail, when the micro speaker is corrected before leaving the factory, the conduction state of the electromagnet assembly 3 is always synchronized with the conduction state of the voice coil in the speaker single body 1 during use. Specifically, the swing of the micro speaker can be detected by the Klippel test system, and then the setting number, position, polarity, magnetic force size, etc. of the electromagnet assembly 3 are adjusted. Correcting the vibration assembly before leaving the factory can reduce the scrap rate of the micro speaker and save production resources. When the vibration assembly is corrected in real time during use of the micro speaker, the micro speaker further comprises a controller and a swing monitoring device, and the controller is electrically connected with the swing monitoring device and the electromagnet assembly 3. The controller can be arranged in the shell or outside the shell, and the swing monitoring device can be arranged in the shell. The controller can be a CPU platform or a PA DSP platform. The controller is used for receiving real-time monitoring data from the swing monitoring device and controlling the electromagnet assembly 3 according to the received real-time monitoring data. The swing monitoring device can be a distance measuring sensor for monitoring the ball top 12 on the diaphragm 5 or a plurality of capacitor plates arranged on the ball top 12 and the shell. The vibration state of the ball top 12 is detected in real time by the change of the distance between the capacitor plates. The swing monitoring device is used for monitoring the swing of the vibration assembly of the micro speaker in real time, obtaining real-time monitoring data and sending the real-time monitoring data to the controller. The vibration assembly in the micro speaker can be corrected in real time, which greatly improves the acoustic performance and service life of the micro speaker.

[0053] It should be noted that the micro speaker of the embodiment can be formed with a receiver, that is, the receiver adopting the technical solution also belongs to the protection scope of the patent.

[0054] In summary, the micro speaker provided by the application can correct the swing of the vibration assembly in advance or in real time, improve the working stability of the micro speaker, avoid noise during work of the micro speaker, and help to ensure the acoustic performance of the micro speaker.

[0055] The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent transformation or direct or indirect application in related technical fields based on the content of the specification and drawings is also included in the patent protection scope of the application.

Claims

1. A micro speaker, comprising a speaker unit, characterized in that: Also includes a controller, a swing monitoring device and at least one electromagnet assembly disposed outside the speaker unit; The electromagnet assembly is used to enhance or weaken the local magnetic field strength of the magnetic circuit system of the speaker unit, and the swing monitoring device is used to monitor the swing of the micro-speaker vibration assembly in real time, obtain real-time monitoring data and send the real-time monitoring data to the controller; the controller is used to receive the real-time monitoring data from the swing monitoring device and control the operation of the electromagnet assembly according to the received real-time monitoring data.

2. The micro-speaker according to claim 1, wherein: It also includes a bracket, which is provided with an accommodating hole for accommodating the electromagnet assembly.

3. The micro-speaker according to claim 2, wherein: The bracket is connected to the speaker unit.

4. The micro-speaker according to claim 1, wherein: A magnetic gap is provided in the speaker unit, and the electromagnet assembly is arranged corresponding to the magnetic gap.

5. The micro-speaker according to claim 4, wherein: The loudspeaker unit includes a diaphragm, and the electromagnet assembly is located on a side of the diaphragm away from the magnetic gap.

6. The micro-speaker according to claim 4, wherein: The speaker unit includes a magnetic bowl, and the electromagnet assembly is located on a side of the magnetic bowl away from the magnetic gap.

7. The micro-speaker according to claim 6, wherein: The electromagnet assembly includes an iron core and a coil wound around the iron core, and the iron core is connected to the magnetic bowl.

8. The micro-speaker according to claim 7, wherein: The magnetic bowl and the iron core are integrally formed; or, the magnetic bowl and the iron core are connected by adhesive bonding, snap connection, thread connection or screw connection.

9. The micro-speaker according to claim 4, wherein: The number of the electromagnet assemblies is greater than or equal to four, and the four corners of the magnetic gap are respectively provided with the electromagnet assemblies, or the four sides of the magnetic gap are respectively provided with the electromagnet assemblies.

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