CN115955636A - Planar loudspeaker and earphone - Google Patents
Planar loudspeaker and earphone Download PDFInfo
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- CN115955636A CN115955636A CN202310000127.2A CN202310000127A CN115955636A CN 115955636 A CN115955636 A CN 115955636A CN 202310000127 A CN202310000127 A CN 202310000127A CN 115955636 A CN115955636 A CN 115955636A
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- permanent magnet
- diaphragm
- array
- magnetizer
- permanent
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Abstract
The invention provides a planar loudspeaker and an earphone, which comprise a vibrating diaphragm and a permanent magnet array, wherein the periphery of the vibrating diaphragm is fixed on a frame, the permanent magnet array is composed of a plurality of permanent magnets, and the permanent magnet array is arranged at intervals with the vibrating diaphragm and corresponds to a coil coated or embedded on the vibrating diaphragm; the permanent magnet is provided with a first end facing the vibrating diaphragm and a second end facing away from the vibrating diaphragm; magnetizers are arranged near the permanent magnets at least in the middle of the permanent magnet array, and the second ends of the two adjacent permanent magnets with opposite magnetic poles can be respectively and selectively connected with the two ends of the magnetizers; can convenience of customers nimble adjustment the vibrating diaphragm is vibration direction and the difference of amplitude everywhere, has reduced the distortion, has improved tone quality and sound power.
Description
Technical Field
The invention relates to the field of audio output equipment, in particular to a planar loudspeaker and an earphone.
Background
The planar speaker has a planar voice coil embedded in a thin diaphragm, and can uniformly distribute driving force like a printed circuit board. The magnet is concentrated on one or both sides of the diaphragm, which vibrates in the magnetic field formed by the diaphragm. The diaphragm of the flat-panel earphone with the planar speaker is not as light as the diaphragm of the electrostatic earphone, but has the same large vibration area and similar tone quality.
The planar speaker combines the advantages of both a moving coil speaker and an electrostatic speaker, has better performance in low frequency than the electrostatic speaker, and is stronger than the moving coil speaker in high frequency, and the transducer at the core thereof is generally structured such that a plurality of strip-shaped permanent magnets are arranged side by side on a yoke, a diaphragm is arranged in parallel with respect to the magnetic pole surfaces of the permanent magnets, the periphery of the diaphragm is fixed on a frame so as to be in a tensioned state, and a coil is provided on the diaphragm at a position opposed to the permanent magnets. The current flowing inside the coil is orthogonal to the magnetic field generated by the permanent magnet. In this way, when an alternating current flows through the coil, the coil generates a force according to faraday's law, and the diaphragm vibrates in the vertical direction by the force, the alternating current signal is converted into an acoustic signal.
The maximum amplitude of the existing plane loudspeaker diaphragm is limited by the distance from the diaphragm to the permanent magnet, and in order to ensure the magnetic field intensity at the diaphragm, the distance from the diaphragm to the permanent magnet is very small, so that the vibration amplitude of the diaphragm is limited, and low power and distortion phenomena exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a planar loudspeaker, which comprises a vibrating diaphragm and a permanent magnet array, wherein the periphery of the vibrating diaphragm is fixed on a frame, the permanent magnet array is composed of a plurality of permanent magnets, and the permanent magnet array is arranged at intervals with the vibrating diaphragm and is arranged corresponding to a coil coated or embedded on the vibrating diaphragm; the permanent magnet is provided with a first end facing the vibrating diaphragm and a second end facing away from the vibrating diaphragm; magnetizers are arranged near the permanent magnets at least in the middle of the permanent magnet array, and the second ends of the two adjacent permanent magnets with opposite magnetic poles can be respectively and selectively connected with the two ends of the magnetizers.
Preferably, the permanent magnets constituting the permanent magnet array are uniformly distributed.
Preferably, the permanent magnet array is composed of a plurality of concentric ring-shaped nested permanent magnets; or the permanent magnet array is composed of a plurality of strip-shaped permanent magnets which are parallel to each other.
Preferably, the permanent magnet array is two layers, and the diaphragm is located between the two layers of the permanent magnet array.
Preferably, the magnetic field intensity generated by the permanent magnet positioned in the middle of the permanent magnet array is not less than that generated by the permanent magnet positioned in the peripheral position of the permanent magnet array.
Preferably, the thickness of the permanent magnet located at the middle of the permanent magnet array is smaller than the thickness of the permanent magnet located at the periphery of the permanent magnet array.
Preferably, the second end of the permanent magnet is a plane parallel to the diaphragm, and the distance between the first end of the permanent magnet located in the middle of the permanent magnet array and the diaphragm is greater than the distance between the first end of the permanent magnet located in the periphery of the permanent magnet array and the diaphragm.
Preferably, a magnetizer is arranged near all the permanent magnets.
Preferably, a sound guide hole perpendicular to the diaphragm is formed in the position, between the two permanent magnets, of the magnetizer.
Preferably, the permanent magnet driving device further comprises a plurality of magnetizer actuating members, each magnetizer actuating member correspondingly drives one or a group of magnetizers to move towards or away from the second end of the permanent magnet, so that the magnetizers are connected with or separated from the second end of the permanent magnet; the distance between the second end of the permanent magnet at different positions and the corresponding magnetizer is different by controlling the actuating piece of different magnetizers, so that the magnetic field intensity generated by the permanent magnet at different positions in the permanent magnet array is different.
Preferably, the frame is provided with a guide hole perpendicular to the diaphragm, the magnetizer actuator is a guide block capable of moving axially along the guide hole, and the guide block is fixedly connected with the magnetizer axially along the guide hole.
Preferably, the guide hole is in threaded engagement with the guide block, and rotational movement of the guide block relative to the guide hole causes axial movement of the guide block relative to the guide hole.
Preferably, the second end of permanent magnet the magnetizer orientation the one end of second end possesses the joint structure of mutually supporting, works as the magnetizer is connected to when the second end, the joint structure makes the permanent magnet with the magnetizer keeps connected state.
Preferably, at least the permanent magnet located in the middle of the permanent magnet array is a neodymium iron boron magnet.
The invention also provides an earphone which is provided with the planar loudspeaker.
The invention provides a planar loudspeaker and an earphone, which comprise a vibrating diaphragm and a permanent magnet array, wherein the periphery of the vibrating diaphragm is fixed on a frame, the permanent magnet array is composed of a plurality of permanent magnets, and the permanent magnet array is arranged at intervals with the vibrating diaphragm and corresponds to a coil coated or embedded on the vibrating diaphragm; the permanent magnet is provided with a first end facing the diaphragm and a second end facing away from the diaphragm; magnetizers are arranged near the permanent magnets at least in the middle of the permanent magnet array, and the second ends of the two adjacent permanent magnets with opposite magnetic poles can be respectively and selectively connected with the two ends of the magnetizers; can convenience of customers nimble adjustment the vibrating diaphragm is vibration direction and the difference of amplitude everywhere, has reduced the distortion, has improved tone quality and sound power.
Drawings
Fig. 1 is a schematic view of a first planar speaker according to an embodiment of the present invention;
fig. 2 is a schematic view of a second planar speaker according to the embodiment of the present invention;
FIG. 3 is a schematic view of a third planar speaker according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a state change of the planar speaker shown in FIG. 3 according to the present invention;
FIG. 5 is a schematic view of a fourth planar speaker according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a change in a diaphragm vibration characteristic curve that can be achieved by the planar speaker according to the embodiment of fig. 1, 2, 3, and 5 of the present invention.
The loudspeaker comprises a planar loudspeaker 100, a permanent magnet 110A at the peripheral position, a permanent magnet 110B at the middle position, a diaphragm 120, a coil 130, a magnetizer 140, a frame 150, a guide hole 151 and a guide block 160.
Detailed Description
In order to solve the problems of limited overall amplitude and distortion of the diaphragm of the conventional planar loudspeaker, the planar loudspeaker and the earphone provided by the invention are realized by the following technical scheme:
example 1:
the present embodiment provides a planar speaker 100, please refer to fig. 1 to fig. 6, which includes a diaphragm 120 whose periphery is fixed on a frame 150, and a permanent magnet array formed by a plurality of permanent magnets 110, wherein the permanent magnet array is disposed at an interval with the diaphragm 120 and corresponds to a coil 130 applied or embedded on the diaphragm 120; the permanent magnet 110 has a first end facing the diaphragm 120 and a second end facing away from the diaphragm 120; a magnetizer 140 is disposed near the permanent magnet 110B at least in the middle of the permanent magnet array, and the second ends of the two adjacent permanent magnets 110 with opposite magnetic poles can be selectively connected to two ends of the magnetizer 140 respectively. The magnetizer 140 can effectively reduce the interference of the magnetic field generated by the opposite pole of the permanent magnet 110 with the magnetic field positioned between the two permanent magnets 110, thereby reducing the field strength loss. For example, the permanent magnet 110B located only at the middle position of the permanent magnet array has its magnetic field strength strengthened by the magnetizer 140, and the permanent magnet 110A located at the peripheral position of the permanent magnet array is not provided with the magnetizer 140, so that the magnetic field strength generated by the permanent magnet 110B located at the middle position of the permanent magnet array is greater than the magnetic field strength generated by the permanent magnet 110A located at the peripheral position of the permanent magnet array.
Specifically, the permanent magnets 110 constituting the permanent magnet array are uniformly distributed.
Specifically, the permanent magnet array is composed of a plurality of concentric ring-shaped nested permanent magnets 110; or, the permanent magnet array is composed of a plurality of strip-shaped permanent magnets 110 parallel to each other.
Specifically, the permanent magnet arrays are two layers, and the diaphragm 120 is located between the two layers of the permanent magnet arrays.
Specifically, the magnetic field intensity generated by the permanent magnet 110B located at the middle position of the permanent magnet array is not less than the magnetic field intensity generated by the permanent magnet 110A located at the peripheral position of the permanent magnet array. When the magnetic field intensity generated by the permanent magnet 110B located in the middle of the permanent magnet array is 3.5-5.0 times of the magnetic field intensity generated by the permanent magnet 110A located in the peripheral position of the permanent magnet array, the middle of the diaphragm 120 can vibrate more sufficiently, and the high-frequency distortion in the diaphragm 120 is reduced to the greatest extent. This can be achieved by making the maximum energy product of the permanent magnet 110B located at the center of the permanent magnet array larger than the maximum energy product of the permanent magnet 110A located at the outer periphery of the permanent magnet array.
Specifically, referring to fig. 2, the thickness of the permanent magnet 110B located at the middle of the permanent magnet array is smaller than the thickness of the permanent magnet 110A located at the periphery of the permanent magnet array.
Specifically, the second end of the permanent magnet 110 is a plane parallel to the diaphragm 120, and a distance between the first end of the permanent magnet 110B located in the middle of the permanent magnet array and the diaphragm 120 is greater than a distance between the first end of the permanent magnet 110A located in the periphery of the permanent magnet array and the diaphragm 120. Based on this, the vibration space at the middle position of the diaphragm 120 can be made larger, and the medium-high frequency distortion of the planar speaker can be effectively reduced.
Specifically, referring to fig. 3 and 4, all the permanent magnets 110 are provided with magnetizers 140.
Specifically, a sound guide hole perpendicular to the diaphragm 120 is disposed on the magnetizer 140 at a position between the two permanent magnets 110.
Specifically, the magnetic flux sensor further comprises a plurality of magnetizer 140 actuators, each magnetizer 140 actuator correspondingly drives one or a group of magnetizers 140 to move towards or away from the second end of the permanent magnet 110, so that the magnetizer 140 is connected to or disconnected from the second end of the permanent magnet 110; the distance between the second end of the permanent magnet 110 at different positions and the corresponding magnetizer 140 is different by controlling the actuators of different magnetizers 140, so that the magnetic field intensity generated by the permanent magnet 110 at different positions in the permanent magnet array is different. The user can flexibly change the overall acoustic characteristics of the planar speaker 100 by adjusting the distance.
In particular, the magnetic field strength generated by the permanent magnets 110 at different locations within the array of permanent magnets is different such that at least one acoustic characteristic of the overall loudspeaker is optimized. The acoustic features include the following feature information: a high frequency response curve of the diaphragm 120; the medium frequency response curve of the diaphragm 120; a low frequency response curve of the diaphragm 120; one or more mel-frequency cepstral coefficients of the diaphragm 120; a frequency response at one or more predetermined frequencies of the diaphragm 120; frequency response at one or more predetermined locations of the diaphragm 120; a frequency response of the diaphragm 120 across one or more predetermined frequency ranges; the diaphragm 120 responds to one or more resonant frequencies that may be present in the acoustic path. For example, referring to fig. 6, the amplitude characteristic of the diaphragm 120 can be changed between a solid line and a dotted line by the difference of the magnetic field intensity generated by the permanent magnet 110 at different positions in the permanent magnet array; wherein the amplitude characteristic shown by the dotted line is more suitable for representing medium-high frequency audio.
Specifically, referring to fig. 5, the frame 150 is provided with a guide hole 151 perpendicular to the diaphragm 120, the actuator of the magnetic conductor 140 is a guide block 160 capable of moving axially along the guide hole 151, and the guide block 160 and the magnetic conductor 140 are axially fixedly connected along the guide hole 151.
Specifically, the guide hole 151 is threadedly engaged with the guide block 160, and rotational movement of the guide block 160 relative to the guide hole 151 causes axial movement of the guide block 160 relative to the guide hole 151.
Specifically, the second end of the permanent magnet 110, the magnetizer 140 towards the one end of the second end possesses the joint structure of mutually supporting, works as the magnetizer 140 is connected to when the second end, the joint structure makes the permanent magnet 110 with the magnetizer 140 keeps the connected state.
Specifically, at least the permanent magnet 110 located at the middle position of the permanent magnet array is a neodymium iron boron magnet.
The planar speaker provided by the embodiment includes a diaphragm 120 whose periphery is fixed on a frame 150, and a permanent magnet array composed of a plurality of permanent magnets 110, the permanent magnet array being disposed at an interval with the diaphragm 120 and corresponding to a coil 130 coated or embedded on the diaphragm 120; the permanent magnet 110 has a first end facing the diaphragm 120 and a second end facing away from the diaphragm 120; a magnetizer 140 is disposed near the permanent magnet 110B at least in the middle of the permanent magnet array, and the second ends of two adjacent permanent magnets 110 with opposite magnetic poles can be selectively connected to two ends of the magnetizer 140 respectively; the difference between the vibration direction and the vibration amplitude of each position of the diaphragm 120 can be flexibly adjusted by a user, the distortion is reduced, and the sound quality and the sound power are improved.
Example 2:
this embodiment provides an earphone having the planar speaker 100 of any one of embodiments 1, and having the same performance, which is not described again.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (15)
1. A planar loudspeaker is characterized by comprising a vibrating diaphragm and a permanent magnet array, wherein the periphery of the vibrating diaphragm is fixed on a frame, the permanent magnet array is composed of a plurality of permanent magnets, and the permanent magnet array is arranged at intervals with the vibrating diaphragm and corresponds to a coil coated or embedded on the vibrating diaphragm; the permanent magnet is provided with a first end facing the vibrating diaphragm and a second end facing away from the vibrating diaphragm; magnetizers are arranged near the permanent magnets at least in the middle of the permanent magnet array, and the second ends of the two adjacent permanent magnets with opposite magnetic poles can be respectively and selectively connected with the two ends of the magnetizers.
2. The planar speaker as claimed in claim 1, wherein the permanent magnets constituting the permanent magnet array are uniformly distributed.
3. The planar speaker as claimed in claim 1, wherein the permanent magnet array is composed of a plurality of concentric ring-shaped nested permanent magnets; or the permanent magnet array is composed of a plurality of strip-shaped permanent magnets which are parallel to each other.
4. The planar speaker as claimed in claim 1, wherein the permanent magnet array is two layers, and the diaphragm is located between the two layers of the permanent magnet array.
5. The planar speaker as claimed in claim 1, wherein the magnetic field intensity generated by the permanent magnet located at the center of the array of permanent magnets is not less than the magnetic field intensity generated by the permanent magnet located at the periphery of the array of permanent magnets.
6. The planar speaker of claim 1, wherein the thickness of the permanent magnet at the center of the array of permanent magnets is smaller than the thickness of the permanent magnet at the periphery of the array of permanent magnets.
7. The planar speaker as claimed in claim 6, wherein the second end of the permanent magnet is parallel to the plane of the diaphragm, and the distance between the first end of the permanent magnet located at the middle of the permanent magnet array and the diaphragm is greater than the distance between the first end of the permanent magnet located at the periphery of the permanent magnet array and the diaphragm.
8. The planar speaker as claimed in claim 1, wherein a magnetic conductor is provided in the vicinity of all the permanent magnets.
9. The planar speaker as claimed in claim 1, wherein a sound guide hole perpendicular to the diaphragm is formed in the magnetic conductor at a position between the two permanent magnets.
10. The planar speaker as claimed in claim 1, further comprising a plurality of magnetizer actuators, each magnetizer actuator driving one or a group of magnetizers to move towards or away from the second end of the permanent magnet, so as to connect or disconnect the magnetizer with or from the second end of the permanent magnet; the distance between the second end of the permanent magnet at different positions and the corresponding magnetizer is different by controlling the actuating piece of different magnetizers, so that the magnetic field intensity generated by the permanent magnet at different positions in the permanent magnet array is different.
11. The planar speaker as claimed in claim 10, wherein the frame is provided with a guide hole perpendicular to the diaphragm, and the magnetizer actuator is a guide block axially movable along the guide hole, the guide block being axially fixed to the magnetizer along the guide hole.
12. The planar speaker as recited in claim 11, wherein said guide hole is threadedly engaged with said guide block, and rotational movement of said guide block relative to said guide hole causes axial movement of said guide block relative to said guide hole.
13. The planar speaker of claim 1, wherein the second end of the permanent magnet and the end of the magnetizer facing the second end are provided with mutually-matched clamping structures, and when the magnetizer is connected to the second end, the clamping structures enable the permanent magnet and the magnetizer to keep a connection state.
14. The planar speaker of claim 1, wherein at least the permanent magnet located at the center of the array of permanent magnets is a neodymium-iron-boron magnet.
15. An earphone having the planar speaker of any one of claims 1-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310000127.2A CN115955636A (en) | 2023-01-01 | 2023-01-01 | Planar loudspeaker and earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310000127.2A CN115955636A (en) | 2023-01-01 | 2023-01-01 | Planar loudspeaker and earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115955636A true CN115955636A (en) | 2023-04-11 |
Family
ID=87282499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310000127.2A Pending CN115955636A (en) | 2023-01-01 | 2023-01-01 | Planar loudspeaker and earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115955636A (en) |
-
2023
- 2023-01-01 CN CN202310000127.2A patent/CN115955636A/en active Pending
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Address after: 215300 No. 2001 Yingbin West Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province Applicant after: Kunshan Haifeiman Technology Group Co.,Ltd. Address before: No. 2001, Yingbin West Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, 215311 Applicant before: Kunshan Haifeiman Technology Group Co.,Ltd. |