WO2021056294A1

WO2021056294A1 - Horn apparatus

Info

Publication number: WO2021056294A1
Application number: PCT/CN2019/107965
Authority: WO
Inventors: 何朝阳; 孟献振; 李嘉玮
Original assignee: 常州阿木奇声学科技有限公司
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-04-01

Abstract

The present invention relates to a horn apparatus. The horn apparatus comprises a housing, and a magnetic circuit system and a vibration system that are provided in the housing. The vibration system comprises a planar driving coil that may generate mechanical motion under the action of the magnetic field of the magnetic circuit system, and a vibration diaphragm driven by the planar driving coil. The magnetic circuit system comprises a magnetically conductive protrusion protruding toward the planar driving coil so as to guide the magnetic field concentration region of the magnetic circuit system to extend to or be close to the maximum stressed position of the planar driving coil. The horn apparatus of the present invention can effectively reduce the thickness of the horn apparatus because the planar driving coil drives the vibration diaphragm.

Description

Horn device

Technical field

The present invention relates to the field of acoustics, and more specifically, to a horn device.

Background technique

The horn device is an electro-acoustic element whose function is to convert an electric signal into an acoustic signal. With the current trend of thinning, the size requirements of the horn device are also more stringent.

The horn device in the related art includes two types: a moving iron unit and a moving coil unit. The moving iron unit drives the diaphragm to vibrate through the drive rod to make it vibrate and produce sound. The horn device of this structure has a regular appearance and small volume, but the structure is complex and the cost is high. The moving coil unit has a relatively simple structure and low cost, but its shape is irregular and its size is too large.

technical problem

The technical problem to be solved by the present invention is to provide an improved horn device.

Technical solutions

The technical solution adopted by the present invention to solve its technical problems is to construct a horn device that includes a housing, a magnetic circuit system and a vibration system arranged in the housing, and the vibration system includes The planar drive coil that generates mechanical motion under the action of the magnetic field of the circuit system and the diaphragm driven by the planar drive coil, the magnetic circuit system includes a magnetically conductive protrusion extending toward the planar drive coil to guide The magnetic field concentration area of the magnetic circuit system extends to or close to the maximum force position of the planar drive coil.

In some embodiments, the magnetically conductive protrusion is penetrated from the side of the planar drive coil close to the magnetic circuit system to the side far away from the magnetic circuit system.

In some embodiments, the diaphragm includes an avoiding portion that arches away from the magnetic circuit system.

In some embodiments, the diaphragm includes a planar portion for the planar drive coil, and the relief portion is formed on the planar portion.

In some embodiments, the planar drive coil has a ring shape, which includes a hollow portion in the middle, and the magnetic conductive protrusion penetrates the planar drive coil through the hollow portion, and the avoiding portion is connected to the hollow portion. Department correspondence.

In some embodiments, the magnetic circuit system includes an electromagnet in the middle, and the magnetically conductive protrusions are arranged on the top of the electromagnet.

In some embodiments, the electromagnet includes an iron core and a coil surrounding the side wall of the iron core, and the magnetic conductive protrusion is disposed on the top of the iron core.

In some embodiments, the magnetic circuit system includes two permanent magnets, and the two permanent magnets are respectively arranged on two opposite sides of the electromagnet and arranged in a staggered arrangement with the electromagnet.

In some embodiments, the electromagnet and the two permanent magnets are both elongated, and the two permanent magnets are respectively arranged at two opposite sides of the permanent magnet in parallel and spaced apart.

In some embodiments, the magnetic circuit system includes a controller electrically connected to the electromagnet to control the magnitude of the current flowing through the electromagnet.

In some embodiments, the planar drive coil is bonded to the diaphragm by printing or bonding.

Beneficial effect

The horn device implementing the present invention has the following beneficial effects: Since the driving circuit of the vibration system is planar, the thickness of the horn device can be effectively reduced.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

FIG. 1 is a schematic diagram of the three-dimensional structure of the horn device in the first embodiment of the present invention;

2 is a schematic diagram of the A-A cross-sectional structure of the horn device shown in FIG. 1;

3 is a schematic diagram of a three-dimensional exploded structure of the horn device shown in FIG. 1;

4 is a schematic diagram of the three-dimensional structure of the horn device in the second embodiment of the present invention;

FIG. 5 is a schematic diagram of a three-dimensional exploded structure of the horn device shown in FIG. 4;

6 is a schematic diagram of the three-dimensional structure of the horn device in the third embodiment of the present invention;

FIG. 7 is a schematic diagram of a three-dimensional exploded structure of the horn device shown in FIG. 6;

FIG. 8 is a schematic diagram of a three-dimensional exploded cross-sectional structure of the horn device shown in FIG. 6;

9 is a schematic diagram of the three-dimensional structure of the horn device in the fourth embodiment of the present invention;

FIG. 10 is a schematic diagram of a three-dimensional exploded structure of the horn device shown in FIG. 9;

11 is a partial three-dimensional structural diagram of the horn device in the fifth embodiment of the present invention;

Fig. 12 is a three-dimensional exploded structural diagram of the horn device shown in Fig. 11;

13 is a partial three-dimensional structural diagram of the horn device in the sixth embodiment of the present invention;

14 is a schematic diagram of the three-dimensional structure of the horn device in the seventh embodiment of the present invention;

15 is a schematic diagram of a three-dimensional exploded structure of the horn device shown in FIG. 14;

FIG. 16 is a schematic diagram of a longitudinal cross-sectional structure of the horn device shown in FIG. 14.

Embodiments of the present invention

In order to have a clearer understanding of the technical features, objectives and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationship shown in the drawings, constructed and operated in a specific orientation, It is only for the convenience of describing the technical solution, rather than indicating that the pointed device or element must have a specific orientation, so it cannot be understood as a limitation of the present invention.

Figures 1 to 3 show the horn device 1 in the first embodiment of the present invention. The horn device 1 can be used in electronic products such as earphones and mobile phones to convert electrical signals into mechanical motion, and finally into sound signals. The horn device 1 may include a housing 110, a magnetic circuit system 120 arranged in the housing 110, and a vibration system 130 arranged in the housing 110 and movable under the action of the magnetic circuit system 120. In some embodiments, the magnetic circuit system 120 may be disposed on the bottom wall of the housing 110, and the vibration system 130 is disposed directly above the magnetic circuit system 120. In some embodiments, the housing 110 may have a rectangular parallelepiped shape, and it may include a lower housing 111 and an upper housing 112 matched with the lower housing 111. The lower shell 111 and the upper shell 112 are combined together to define an installation space for accommodating the magnetic circuit system 120 and the vibration system 130.

The magnetic circuit system 120 may include an electromagnet 121 and a magnet 122 disposed on the top of the electromagnet 121 in some embodiments. In some embodiments, the electromagnet 121 may include a rectangular iron core 1211 laid flat on the bottom wall of the lower housing 111. And a racetrack loop drive coil 1212 surrounding the side wall surface of the iron core 1211. The permeable magnet 122 may be in the shape of a sheet in some embodiments, and its shape and size are adapted to the electromagnet 121. In some embodiments, the magnetic circuit system 120 may further include a controller (not shown) connected to the driving coil 1212. The controller is used to control the current flowing through the driving coil 1212 to control the electromagnetic field force of the electromagnet 121. Size, so that the sensitivity of the horn device 1 can be controlled. Compared with the magnetic circuit system using only permanent magnets, the advantages of the magnetic circuit system 120 are very obvious.

In some embodiments, the vibration system 130 includes a planar diaphragm 131 horizontally arranged above the magnetic circuit system 120 and a driving coil 132 combined with the bottom surface of the diaphragm 131. The driving coil 132 can be wound into a racetrack loop with a wire and surround it. At the periphery of the electromagnet 121, the driving coil 132 may be one layer or more than one layer. After the driving coil 132 is energized, it can move under the action of the magnetic circuit system 120 and drive the diaphragm 131 to move to produce sound. In some embodiments, the diaphragm 131 includes a flat portion 1311 and an arched Mylar diaphragm 1312 connected to the periphery of the flat portion 1311. The diaphragm 131 is connected to the housing 110 via the Mylar diaphragm 1312.

4 and 5 show the horn device 2 in the second embodiment of the present invention. The horn device 2 may include a housing 210, a magnetic circuit system 220 arranged in the housing 210, and a magnetic circuit system 220 arranged in the housing 210 and The vibration system 230 moves under the action of the magnetic circuit system 220. In some embodiments, the magnetic circuit system 220 may be disposed on the bottom wall of the housing 210, and the vibration system 230 is disposed directly above the magnetic circuit system 220. The housing 210 may be circular in some embodiments, and it may include a lower housing 211 and an upper housing (not) matched with the lower housing 211. The lower casing 211 and the upper casing are combined together to define an installation space for accommodating the magnetic circuit system 220 and the vibration system 230.

The magnetic circuit system 220 may include an array of a plurality of electromagnets 221 in some embodiments. Each electromagnet 221 has a longitudinal shape, and the electromagnets 221 are arranged in parallel and spaced apart, and a gap 222 is formed between adjacent electromagnets 221. Each electromagnet 221 includes an elongated iron core 2211 and a coil 2212 surrounding the side wall of the iron core. The polarities of the adjacent electromagnets 221 are staggered up and down, that is, if the upper end of an electromagnet 221 is the N pole, the upper end of the adjacent electromagnet 221 is the S pole. In some embodiments, the magnetic circuit system 220 may further include a controller (not shown) respectively connected to the electromagnets 221. The controller is used to control the current flowing through the coils 2212 of the electromagnets 221 to control the electromagnets 221. The size of the electromagnetic field force of the body 221 can control the sensitivity of the horn device 2.

In some embodiments, the vibration system 230 includes a planar diaphragm 231 horizontally arranged above the magnetic circuit system 220 and a planar drive coil 232 combined with the surface of the diaphragm 231. The drive coil 232 can be printed, etched, thermoformed, Gluing or laser etching is formed on the surface of the diaphragm 231, which may be formed on the lower surface and/or the upper surface of the diaphragm 231. The diaphragm 231 may include a flexible circuit board in some embodiments. In some embodiments, the driving coil 232 may include a plurality of straight sections 2321, and the straight sections 2321 are respectively arranged corresponding to the gaps 222 between the electromagnets 221. During operation, according to the left-hand rule, after the driving coil 232 is energized, these straight sections 2321 will be subjected to upward or downward force in the horizontal magnetic field directly above the gap 222 of the magnetic circuit system 220, thereby generating movement.

6 to 8 show a horn device 3 in a third embodiment of the present invention. The horn device 3 may include a housing 310, a magnetic circuit system 320 arranged in the housing 310, and a magnetic circuit system 320 arranged in the housing 310 and The vibration system 330 moves under the action of the magnetic circuit system 320. In some embodiments, the magnetic circuit system 320 may be disposed on the bottom wall of the housing 310, and the vibration system 330 is disposed directly above the magnetic circuit system 320. The housing 310 may have a circular shape in some embodiments, and it may include a lower housing 311 and an upper housing (not) matched with the lower housing 311. The lower casing 311 and the upper casing are combined together to define an installation space for accommodating the magnetic circuit system 320 and the vibration system 330.

The magnetic circuit system 320 may include an array of a plurality of electromagnets 321 in some embodiments. Each electromagnet 321 has a cylindrical shape. The electromagnets 321 include a central electromagnet 321 located in the middle and a number of peripheral electromagnets 321 arranged in a circular array around the central electromagnet 321. The central electromagnet 321 and A gap 322 is formed between the peripheral electromagnets 321. Each electromagnet 321 includes a cylindrical iron core 3211 and a coil 3212 surrounding the side wall of the iron core 3211. The polarities of the central electromagnet 321 and the peripheral electromagnets 321 are alternately arranged up and down, that is, if the upper end of the central electromagnet 321 is an N pole, the upper end of the peripheral electromagnet 321 is an S pole. In some embodiments, the magnetic circuit system 320 may further include a controller (not shown) respectively connected to the electromagnets 321. The controller is used to control the current flowing through the coils 3212 of the electromagnets 321 to control the electromagnets. The size of the electromagnetic field force of the body 321 can control the sensitivity of the horn device 3. In some embodiments, the central electromagnet 321 is larger than the size of the peripheral electromagnet 321.

In some embodiments, the vibration system 330 includes a planar diaphragm 331 horizontally arranged above the magnetic circuit system 220 and a planar drive coil 332 combined on the surface of the diaphragm 331. The drive coil 332 can be spirally wound with a wire. It can be bonded to the lower surface and/or upper surface of the diaphragm 331 by means of bonding or the like. In some embodiments, the driving coil 332 may have a circular ring shape and is arranged corresponding to the gap 322 between the central electromagnet 321 and the peripheral electromagnet 321. In the working process, according to the left-hand rule, after the driving coil 332 is energized, it will receive an upward or downward force in the horizontal magnetic field directly above the gap 322 of the magnetic circuit system 320, thereby generating movement.

9 and 10 show the horn device 4 in the fourth embodiment of the present invention. The horn device 4 may include a housing 410, a magnetic circuit system 420 arranged in the housing 410, and a magnetic circuit system 420 arranged in the housing 410. The vibration system 430 moves under the action of the magnetic circuit system 420. In some embodiments, the magnetic circuit system 420 may be disposed on the bottom wall of the housing 410, and the vibration system 430 is disposed directly above the magnetic circuit system 420. The housing 410 may be rectangular in some embodiments, and it may include a lower housing 411 and an upper housing 412 matched with the lower housing 411. The lower housing 411 and the upper housing 412 are combined together to define an installation space for accommodating the magnetic circuit system 420 and the vibration system 430.

The magnetic circuit system 420 may include an array of a plurality of electromagnets 421 in some embodiments. Each electromagnet 421 is elongated. These electromagnets 421 include a central electromagnet 421 located in the middle, side electromagnets 421 arranged in parallel and spaced apart on opposite sides of the central electromagnet 421, and spaced and perpendicularly distributed in the central electromagnet. A gap 422 is formed between the end electromagnets 421 at both ends of the body 421, the center electromagnet 421 and the side electromagnets 421 and the end electromagnets 421. Each electromagnet 421 includes an elongated iron core 4211 and a coil 4212 surrounding the side wall of the iron core 4211. The polarities of the center electromagnet 421 and the side electromagnets 421 and the end electromagnets 421 are arranged in a staggered manner, that is, if the upper end of the center electromagnet 421 is N pole, the upper ends of the side electromagnets 421 and the end electromagnets 421 It is S pole. In some embodiments, the magnetic circuit system 420 may further include controllers (not shown) respectively connected to the electromagnets 421. The controllers are used to control the current flowing through the coils 4212 of the electromagnets 421 to control the electromagnets. The size of the electromagnetic field force of the body 421 can thereby control the sensitivity of the horn device 4.

In some embodiments, the vibration system 430 includes a planar diaphragm 431 horizontally arranged above the magnetic circuit system 420 and a planar drive coil 432 combined on the surface of the diaphragm 431. The drive coil 432 can be spirally wound with a wire. It can be bonded to the lower surface and/or upper surface of the diaphragm 431 by means of bonding or the like. The driving coil 432 may have a racetrack loop shape in some embodiments, and is arranged corresponding to the gap 422 between the center electromagnet 421 and the side electromagnets 421 and the end electromagnets 421. During the working process, according to the left-hand rule, after the driving coil 432 is energized, it will receive an upward or downward force in the horizontal magnetic field directly above the gap 422 of the magnetic circuit system 420, thereby generating movement.

Figures 11 and 12 show a horn device 5 in a fifth embodiment of the present invention. The horn device 5 may include a housing 510, a magnetic circuit system 520 arranged in the housing 510, and a magnetic circuit system 520 arranged in the housing 510. The vibration system 530 moves under the action of the magnetic circuit system 520. In some embodiments, the magnetic circuit system 520 may be disposed on the bottom wall of the housing 510, and the vibration system 530 is disposed directly above the magnetic circuit system 520. The housing 510 may be rectangular in some embodiments, and it may include a lower housing 511 and an upper housing matched with the lower housing 511. The lower housing 511 and the upper housing are combined together to define an installation space for accommodating the magnetic circuit system 520 and the vibration system 530.

The magnetic circuit system 520 may include an array of a plurality of electromagnets 521 in some embodiments. Each electromagnet 521 is elongated, and the electromagnets 521 are arranged in parallel and spaced apart, and a gap 522 is formed between adjacent electromagnets 521. Each electromagnet 521 includes an elongated iron core 5211 and a coil 5212 surrounding the side wall of the iron core 5211. The polarities of the adjacent electromagnets 521 are staggered up and down, that is, if the upper end of an electromagnet 521 is the N pole, the upper end of the adjacent electromagnet 521 is the S pole. In some embodiments, the magnetic circuit system 520 may further include controllers (not shown) respectively connected to the electromagnets 521. The controllers are used to control the current flowing through the coils 5212 of the electromagnets 521 to control the electromagnets. The size of the electromagnetic field force of the body 521 can control the sensitivity of the horn device 5. The magnetic circuit system 520 may include a plurality of annular washers 523 in some embodiments, and the washers 523 respectively cover the tops of the coils 5212 of the electromagnets 521, and the shapes and sizes are adapted to the corresponding coils 5212.

In some embodiments, the vibration system 530 includes a planar diaphragm (not shown) horizontally arranged above the magnetic circuit system 520 and a planar drive coil 532 combined on the surface of the diaphragm. The drive coil 532 can be in the form of a wire. It is spirally wound, and can be bonded to the lower surface and/or upper surface of the diaphragm by means such as bonding. The driving coil 532 may be S-shaped in some embodiments, and it includes a plurality of straight sections 5321, and the straight sections 5321 are arranged corresponding to the gaps 522 respectively. During the working process, according to the left-hand rule, after the driving coil 532 is energized, it will receive an upward or downward force in the horizontal magnetic field directly above the gap 522 of the magnetic circuit system 520, thereby generating movement.

13 shows the horn device 6 in the sixth embodiment of the present invention. The horn device 6 may include a housing 610, a magnetic circuit system 620 arranged in the housing 610, and a magnetic circuit system 620 arranged in the housing 610 and capable of being connected to the magnetic circuit. A vibration system (not shown) that moves under the action of the system 620. In some embodiments, the magnetic circuit system 620 may be disposed on the bottom wall of the housing 610, and the vibration system is disposed directly above the magnetic circuit system 620. The housing 610 may be rectangular in some embodiments, and it may include a lower housing 611 and an upper housing matched with the lower housing 611. The lower casing 611 and the upper casing are combined together to define an installation space for accommodating the magnetic circuit system 620 and the vibration system.

The magnetic circuit system 620 may include one electromagnet 621 and two permanent magnets 624 in some embodiments. The electromagnet 621 and the permanent magnet 624 are both elongated, and the two permanent magnets 624 are respectively arranged on two opposite sides of the electromagnet 621 and arranged in parallel and spaced apart. A gap 622 is formed between the permanent magnet 624 and the electromagnet 621. The electromagnet 621 includes an elongated iron core 6211 and a coil 6212 surrounding the side wall of the iron core 6211. The polarities of the electromagnet 621 and the permanent magnet 624 are alternately arranged up and down, that is, if the upper end of the electromagnet 621 is an N pole, the upper end of the permanent magnet 624 is an S pole. In some embodiments, the magnetic circuit system 620 may also include a controller (not shown) connected to the electromagnets 621. The controller is used to control the current flowing through the coils 6212 of the electromagnets 621 to control the electromagnets 621. The magnitude of the electromagnetic field force can thereby control the sensitivity of the horn device 6.

Figures 14 and 15 show a horn device 7 in a seventh embodiment of the present invention. The horn device 7 may include a housing 710, a magnetic circuit system 720 arranged in the housing 710, and a magnetic circuit system 720 arranged in the housing 710. The vibration system 730 moves under the action of the magnetic circuit system 720. In some embodiments, the magnetic circuit system 720 may be disposed on the bottom wall of the housing 710, and the vibration system 730 is disposed directly above the magnetic circuit system 720. The housing 710 may be rectangular in some embodiments, and it may include a lower housing 711 and an upper housing 712 matched with the lower housing 711. The lower housing 711 and the upper housing 712 are combined together to define an installation space for accommodating the magnetic circuit system 720 and the vibration system 730.

The magnetic circuit system 720 may include one electromagnet 721 and two permanent magnets 724 in some embodiments. Both the electromagnet 721 and the permanent magnet 724 are elongated, and the two permanent magnets 724 are respectively arranged on two opposite sides of the electromagnet 721 and arranged in parallel and spaced apart. A gap 722 is formed between the permanent magnet 724 and the electromagnet 721. The electromagnet 721 includes a long iron core 7211 and a coil 7212 surrounding the side wall of the iron core 7211. The polarities of the electromagnet 721 and the permanent magnet 724 are alternately arranged up and down, that is, if the upper end of the electromagnet 721 is an N pole, the upper end of the permanent magnet 724 is an S pole. In some embodiments, the magnetic circuit system 720 may further include a controller (not shown) connected to the electromagnets 721. The controller is used to control the current flowing through the coils 7212 of the electromagnets 721 to control the electromagnets 721. The magnitude of the electromagnetic field force can thereby control the sensitivity of the horn device 7.

16 together, the magnetic circuit system 720 in some embodiments may further include a magnetically conductive protrusion 725 disposed on the top of the iron core 7211 of the electromagnet 721, and the magnetically conductive protrusion 725 can be close to or deep into the plane of the vibration system 730 Type the middle part of the drive coil 732 to improve the vibration efficiency. Specifically, because the driving coil 732 is a toroidal planar coil, the strongest position of the magnetic field force generated by the magnetic field is at the center of the driving coil 732. If the main magnetic field of the magnetic circuit system 720 is under the entire driving coil 732, it cannot interact with The maximum force position of the magnetic field of the drive coil 732 is optimally matched. Therefore, when a magnetically conductive protrusion 725 is added to the electromagnet 721, and the magnetically conductive protrusion 725 is placed in the center of the magnetic field of the driving coil 732, the force of the driving coil 732 is the largest at the center, which increases the amplitude and improves The overall sensitivity of the horn device 7 is improved. In some embodiments, the magnetically conductive protrusion 725 is not limited to being applied to the electromagnet 721, and it can also be applied to a permanent magnet.

In some embodiments, the vibration system 730 includes a planar diaphragm 731 horizontally arranged above the magnetic circuit system 720 and a planar drive coil 732 combined on the surface of the diaphragm 731. The drive coil 732 can be spirally wound with a wire. It can be bonded to the lower surface and/or upper surface of the diaphragm 731 by means of bonding or the like. In some embodiments, the driving coil 732 may be a racetrack loop, which includes two opposite straight sections 7321 and a transparent portion 7320 between the two straight sections 7321, and the straight section 7321 corresponds to the gap 722 Set up. During operation, according to the left-hand rule, after the driving coil 732 is energized, it will receive an upward or downward force in the horizontal magnetic field directly above the gap 722 of the magnetic circuit system 720, thereby generating movement. The diaphragm 731 is provided with a dome-shaped avoiding portion 7310 arched toward the outside corresponding to the hollow portion 7320 to form a magnetically conductive protrusion 725 that can extend into it, so that the magnetically conductive protrusion 725 can be driven by a drive coil 732. The side penetrates to the other side, and the magnetic field concentration area of the guiding magnetic circuit system 720 extends to or close to the maximum force position of the driving coil 732.

The diaphragm 731 in some embodiments includes a flat portion 7311 and an arched Mylar diaphragm 7312 connected to the periphery of the flat portion 7311. The diaphragm 731 is connected to the housing 710 via the Mylar diaphragm 7312. The avoiding portion 7310 is formed in the middle of the flat portion 7311 to prevent the diaphragm 731 from contacting the magnetic conductive protrusion 725 during the vibration.

It can be understood that the above technical features can be used in any combination without limitation.

The above are only the embodiments of the present invention, which do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of the present invention, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of the present invention.

Claims

A horn device includes a housing and a magnetic circuit system and a vibration system arranged in the housing. The vibration system includes a planar drive coil that can generate mechanical motion under the action of the magnetic field of the magnetic circuit system and a receiving device. The diaphragm driven by the planar drive coil is characterized in that the magnetic circuit system includes a magnetically conductive protrusion extending toward the planar drive coil to guide the magnetic field concentration area of the magnetic circuit system to extend to or close to The maximum force position of the planar drive coil.
The horn device according to claim 1, wherein the magnetically conductive protrusion penetrates from a side of the planar drive coil close to the magnetic circuit system to a side away from the magnetic circuit system.
4. The horn device according to claim 2, wherein the diaphragm includes an escape portion arched away from the magnetic circuit system; the diaphragm includes a flat portion for the flat drive coil, The escape portion is formed on the flat surface.
The horn device according to claim 3, wherein the planar drive coil has a ring shape, and includes a hollow portion in the middle, and the magnetically conductive protrusion penetrates the planar drive coil through the hollow portion, The avoiding part corresponds to the transparent part.
The horn device according to any one of claims 1 to 4, wherein the magnetic circuit system comprises an electromagnet located in the middle, and the magnetic conductive protrusion is arranged on the top of the electromagnet.
The horn device according to claim 5, wherein the electromagnet comprises an iron core and a coil surrounding the side wall of the iron core, and the magnetic conductive protrusion is arranged on the top of the iron core.
The horn device according to claim 5, wherein the magnetic circuit system comprises two permanent magnets, and the two permanent magnets are respectively arranged on two opposite sides of the electromagnet, and are opposite to the poles of the electromagnet. The sex is staggered.
The horn device according to claim 7, wherein the electromagnet and the two permanent magnets are both elongated, and the two permanent magnets are respectively arranged at two opposite sides of the permanent magnet in parallel and spaced apart. side.
The horn device according to claim 5, wherein the magnetic circuit system comprises a controller electrically connected to the electromagnet to control the magnitude of the current flowing through the electromagnet.
The horn device according to any one of claims 1 to 4, wherein the planar drive coil is connected to the diaphragm by printing or bonding.