Patent Description:
With the continuous improvements of living levels, listening to music has become an approach of relieving mood and relieving pressure when people gets free from the work and has leisure time. Meanwhile, with the continuous pursuit of people on high-quality life, quality requirements on sounding elements such as earphones, loudspeakers and the like are becoming higher and higher. In order to enable each user to listen to true pure sound in life in a noisy environment, the manufacturer has a higher and higher requirement on a low-distortion of a loudspeaker when viewing from the starting point of humanistic care and health concept, where a miniature loudspeaker having a design of the magnetic structure that uses the magnet as the upper magnetic sheet and the lower magnetic sheet has a better magnetic field uniformity characteristic as compared to the traditional miniature loudspeaker; according to this design, the magnetic lines of force are uniformly distributed and symmetric, the magnetic flux leakage is fewer, and thus the distortion of the loudspeaker may be greatly reduced. For example, a prior art document D1 (<CIT>) discloses an electromagnetic transducer such as an audio speaker, having an air-return motor. The use of an air return geometry lacking motor components in the region outside the voice coil assembly permits the spider and cone to be coupled to the bobbin much lower, significantly reducing the thickness of the transducer. The use of both a radially-charged primary magnet and axially-charged concentrating magnets provides greatly increased magnetic flux in the voice coil region. The primary magnet may be a cylindrical magnet or it may include a plurality of flat magnet segments arranged in a polygon. The motor may be coupled to the frame by steel bolts which pass through holes in the spider, to reduce the reluctance of the magnetic circuit. A prior art document D2 (<CIT>) discloses a loudspeaker having at least one speaker assembly that includes a diaphragm, a voice coil for driving the diaphragm; and a magnet assembly positioned adjacent the voice coil for producing a magnetic flux in the vicinity of the voice coil is disclosed. The magnet assembly includes a plurality of small magnets arranged in a generally circular array. The magnets are each cylindrical in shape and are formed of a permanent magnet material such as neodymium. The loudspeaker bipolar, omni-directional loudspeaker. A vent is positioned between the speaker assemblies for introducing air into and passing air out of the speaker assemblies. The vent is designed for maximizing the amount of air flow into and out of the speaker assemblies to provide enhanced venting while eliminating any air noise during operation of the loudspeaker. A prior art document D3 (<CIT>) discloses a low-profile speaker and case assembly includes a case configured to house a handheld electronic device, a digital signal processor attached to an interior surface of the case and coupled to an amplifier. The digital processor is configured to receive audio signals from the handheld electronic device, and to output audio signals to the amplifier. A battery is attached to an interior surface of the case. The battery supplies power to the digital signal processor and amplifier, and a low-profile speaker driver arranged within the case. The low-profile speaker is connected to the amplifier and powered by the battery to produce high quality audio outputs. However, it is long been known that a magnetized radial magnet is prone to be subjected to a repulsive force from the upper and lower pieces of magnets in assembling process, which increases the difficulty in processing of the miniature loudspeaker and it is therefore impossible to produce loudspeakers in a batch mode; moreover, a large amount of manpower and assembly cost are consumed. A prior art document D10 (<CIT>) discloses a voice coil actuator including a magnetic flux conductive material core, having a backplate and a magnet and an electronic current conductive coil. A prior art document D11 (<CIT>) discloses a loudspeaker having a repulsion magnetic circuit capable of suppressing negative magnetic fluxes. The loudspeaker has magnets with the same poles being faced each other and an outer magnet magnetized in a direction different from the counter magnets is disposed outside of the counter magnets. A voice coil containing magnetic material is disposed outside of a magnet magnetized in a radial direction from the inner wall to the outer wall of the magnet.

An objective of the present invention is:.

In order to solve the aforesaid technical problems, the technical solutions adopted by the present invention are as follows:
in one aspect, a radial magnetic structure assembly is provided, the radial magnetic structure assembly is configured to mount an upper axial magnetic sheet and a lower axial magnetic sheet respectively on an upper axial side surface and a lower axial side surface of each of a plurality of tile-shaped magnets and includes: a magnetic central column, and a lower ring member and an upper ring member sleeved on the magnetic central column, where the magnetic central column includes a large-diameter section and a small-diameter section connected in sequence, the radial magnetic structure assembly further includes a limit step provided at a joint of the large-diameter section and the small-diameter section, and the tile-shaped magnets are annularly and uniformly arranged on the limit step, the lower ring member is configured to be sleeved on the tile-shaped magnet in a direction from the large-diameter section towards the small-diameter section and is configured to limit a radial displacement of each tile-shaped magnet, the upper ring member is configured to: be sleeved on the tile-shaped magnet in a direction from the small-diameter section towards the large-diameter section to press the upper axial magnetic sheet against the upper axial side surface of each tile-shaped magnet, and to press the lower axial magnetic sheet against the lower axial side surface of each tile-shaped magnet; the lower ring member and the upper ring member are made of non-metallic materials; one end of the lower ring member is provided with a sealing plate, and one end of the large-diameter section abuts against an inner side of the sealing plate.

Preferably, the radial magnetic structure assembly further includes a sleeve configured to push the upper axial magnetic sheet and the tile-shaped magnet that have been assembled out of the small-diameter section, and to push the upper axial magnetic sheet, the lower axial magnetic sheet and the tile-shaped magnet that have been assembled out of the small-diameter section.

Preferably, the lower ring member is a non-metal lower ring member, and the upper ring member is a non-metal upper ring member.

Preferably, the lower ring member is a plastic lower ring member, and the upper ring member is a plastic upper ring member.

Preferably, the magnetic central column is a soft magnetic central column.

Preferably, the magnetic central column is a low carbon steel magnetic central column.

In a second aspect, a method for assembling radial magnetic structure is provided, the method for assembling radial magnetic structure includes following steps of:.

Preferably, the method for assembling radial magnetic structure further includes: coating quick-drying type glue on the upper axial side surface of each tile-shaped magnet to enable the upper axial magnetic sheet to be secured with each tile-shaped magnet in the step S3; and coating quick-drying type glue on the lower axial side surface of each tile-shaped magnet type glue to enable the lower axial magnetic sheet to be secured with each tile-shaped magnet in the step S5.

Preferably, the quick-drying type glue is A/B glue or anaerobic glue.

Preferably, the method for assembling radial magnetic structure further includes: providing a sleeve and pushing the upper axial magnetic sheet and each tile-shaped magnet that have been assembled out of the small-diameter section through the sleeve in the step S4; and pushing the upper axial magnetic sheet, the upper lower axial magnetic sheet and each tile-shaped magnet that have been assembled out of the small-diameter section through the sleeve in the step S6.

As compared to the prior art, the radial magnetic structure assembly provided by the embodiment of the present invention has the beneficial effects as follows: in assembling process of the radial magnetic structure assembly, each tile-shaped magnet is annularly and uniformly arranged on the limit step formed at the joint of the large-diameter section and the small-diameter section firstly, then, the lower ring member is sleeved to limit the radial displacement of each tile-shaped magnet, then, the upper axial magnetic sheet is pressed against the upper axial side surface of each tile-shaped magnet through the upper ring member to enable each tile-shaped magnet to be secured with the upper axial magnetic sheet; finally, the upper axial magnetic sheet is turned over, and the lower axial magnetic sheet is pressed tightly on the lower axial side surface of each tile-shaped magnet through the upper ring member to enable each tile-shaped magnet to be secured with the lower axial magnetic sheet. In this way, in the assembling process, even though a repulsive magnetic force is generated between each tile-shaped magnet and the upper axial magnetic sheet and the lower axial magnetic sheet, since each tile-shaped magnet is limited by the lower ring member and the upper ring member in the radial direction and in the axial direction, the processing difficulty may be effectively reduced, the manufacturing efficiency may be effectively improved in batch production, and therefore a large amount of manpower and assembly cost may be saved.

The method for assembling radial magnetic structure provided by the embodiment of the present invention has the beneficial effects as follows: in assembling process of the radial magnetic structure assembly, each tile-shaped magnet is annularly and uniformly arranged on the limit step formed at the joint of the large-diameter section and the small-diameter section firstly, then, the lower ring member is sleeved to limit the radial displacement of each tile-shaped magnet, then, the upper axial magnetic sheet is pressed against the upper axial side surface of each tile-shaped magnet through the upper ring member to enable each tile-shaped magnet to be secured with the upper axial magnetic sheet; finally, the upper axial magnetic sheet is turned over, and the lower axial magnetic sheet is pressed tightly on the lower axial side surface of each tile-shaped magnet through the upper ring member to enable each tile-shaped magnet to be secured with the lower axial magnetic sheet. In this way, in the assembling process, even though a repulsive magnetic force is generated between each tile-shaped magnet and the upper axial magnetic sheet and the lower axial magnetic sheet, since each tile-shaped magnet is limited by the lower ring member and the upper ring member in the radial direction and in the axial direction, the processing difficulty may be effectively reduced, the manufacturing efficiency may be effectively improved in batch production, and therefore a large amount of manpower and assembly cost may be saved.

Herein, embodiments of the present invention are described in detail, and examples of the embodiment are illustrated in the accompanying figures; wherein, an always unchanged reference number or similar reference numbers represent(s) identical or similar components or components having identical or similar functionalities. The embodiment described below with reference to the accompanying figures is illustrative and intended to illustrate the present invention, but should not be considered as any limitation to the present invention.

As shown in <FIG>, a radial magnetic structure assembly is provided in an embodiment of the present invention, the radial magnetic structure is configured to respectively mount an upper axial magnetic sheet <NUM> and a lower axial magnetic sheet <NUM> on an upper axial side surface (not shown) and a lower axial side surface (not shown) of a plurality of tile-shaped magnets <NUM>; the radial magnetic structure assembly includes a magnetic central column <NUM>, a lower sleeve ring member <NUM> and an upper sleeve ring member <NUM> sleeved on the magnetic central column <NUM>, the magnetic central column <NUM> includes a large-diameter section <NUM> and a small-diameter section <NUM> connected in sequence, a joint of the large-diameter section <NUM> and the small-diameter section <NUM> is provided with a limit step <NUM> on which the tile-shaped magnets <NUM> are annularly and uniformly arranged, the lower ring member <NUM> is sleeved on the tile-shaped magnet <NUM> in a direction from the large-diameter section <NUM> towards the small-diameter section <NUM> and is configured to limit a radial displacement of each tile-shaped magnet <NUM>, the upper sleeve ring member <NUM> is sleeved in a direction from the small-diameter section <NUM> towards the large-diameter section <NUM>, such that the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM> are respectively pressed on the upper axial side surface and the lower axial side surface of each tile-shaped magnet <NUM> tightly.

Particularly, in assembling process of the radial magnetic structure assembly in the embodiment of the present invention, each tile-shaped magnet <NUM> is annularly and uniformly arranged on the limit step <NUM> formed at the joint of the large-diameter section <NUM> and the small-diameter section <NUM> firstly, then, the lower ring member <NUM> is sleeved to limit the radial displacement of each tile-shaped magnet <NUM>; or alternatively, the lower ring member <NUM> may be sleeved on the large-diameter section <NUM>, then, each tile-shaped magnet <NUM> is annularly and uniformly arranged in the space formed between the limit step <NUM> and the lower sleeve ring member <NUM>, in this way, limiting of the radial displacement of each tile-shaped magnet <NUM> is realized through the lower ring member <NUM>. Then, the upper axial magnetic sheet <NUM> is pressed against the upper axial side surface of each tile-shaped magnet <NUM> through the upper ring member <NUM> to enable each tile-shaped magnet <NUM> to be secured with the upper axial magnetic sheet <NUM>; finally, the upper axial magnetic sheet <NUM> is turned over, and the lower axial magnetic sheet <NUM> is pressed tightly on the lower axial side surface of each tile-shaped magnet <NUM> through the upper ring member <NUM> to enable each tile-shaped magnet <NUM> to be secured with the lower axial magnetic sheet <NUM>. In this way, in the assembling process, even though a repulsive magnetic force is generated between each tile-shaped magnet <NUM> and the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM>, since each tile-shaped magnet <NUM> is limited by the lower ring member <NUM> and the upper ring member <NUM> in the radial direction and in the axial direction, the processing difficulty may be effectively reduced, the manufacturing efficiency may be effectively improved in batch production, and therefore a large amount of manpower and assembly cost may be saved.

As shown in <FIG>, it needs be further noted that, a radial magnetizing needs to be performed on each tile-shaped magnet <NUM> before assembly of the tile-shaped magnet <NUM>, the arrows indicate the directions of the magnetic fields of each tile-shaped magnet <NUM>, when each tile-shaped magnet <NUM> is mounted on the limit step <NUM>, the tile-shaped magnet <NUM> may also connected with the small-diameter section <NUM> in magnetically attractive manner.

The magnetic central column <NUM> is preferably made of a soft magnetic material such as low-carbon steel.

In this embodiment, one end of the lower sleeve ring member <NUM> is provided with a sealing plate <NUM>, and an end of the large-diameter section <NUM> abuts against an inner side of the sealing plate <NUM>. Particularly, when the lower ring member <NUM> is sleeved on the tile-shaped magnet <NUM> in the direction from the large-diameter section <NUM> towards the small-diameter section <NUM>, there is no need to control the depth of sleeving of the lower ring member <NUM>, the lower ring member <NUM> is directly pushed until the inner side of the sealing plate <NUM> of the lower ring member <NUM> abuts against the end of the large-diameter section <NUM>, thus, the assembling efficiency is higher, and the assembling accuracy may also be guaranteed. Preferably, the sealing plate <NUM> and the lower sleeve ring member <NUM> are designed to be integrally shaped.

In this embodiment, as shown in <FIG>, the radial magnetic structure assembly further includes a sleeve <NUM> configured to push the upper axial magnetic sheet <NUM> and the tile-shaped magnet <NUM> that have been assembled out of the small-diameter section <NUM>, and to push the upper axial magnetic sheet <NUM>, the lower axial magnetic sheet <NUM> and the tile-shaped magnet <NUM> that have been assembled out of the small-diameter section <NUM>. Particularly, due to the fact that the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM> need to be assembled with the upper axial side surface and the lower axial side surface of the annularly and uniformly arranged tile-shaped magnet <NUM> respectively, the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> need to be taken out after the assembling of the upper axial direction magnetic sheet <NUM> and the upper axial side surface of each tile-shaped magnet <NUM> is completed; at this moment, the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> are pushed by the sleeve <NUM> until the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> are separated from the small-diameter section <NUM>; the upper axial magnetic sheet <NUM> is turned over, each tile-shaped magnet <NUM> connected with the upper axial magnetic sheet <NUM> is also turned over simultaneously, then, the upper axial magnetic sheet <NUM> is sleeved on the small-diameter section <NUM> until the upper axial magnetic sheet <NUM> is abutted against the limit step <NUM>; at this moment, the assembling of the lower axial magnetic sheet <NUM> is further performed, the method of assembling the lower axial magnetic sheet <NUM> is the same as the method of assembling the upper axial magnetic sheet <NUM>, it is not repeatedly described here.

Preferably, the assembly and connection between the upper axial magnetic sheet <NUM>, the lower axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> may be implemented by quick-drying type glue, such as A/B glue or anaerobic glue.

In this embodiment, the lower ring member <NUM> is a non-metal upper ring member <NUM>, and the upper ring member <NUM> is a non-metal upper ring member. Particularly, the lower ring member <NUM> and the upper ring member <NUM> are made of non-metallic materials, so that they may be avoided from being mutually magnetically attracted with the tile-shaped magnet <NUM>, the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM>, in this way, a free assembly and disassembly of the lower ring member <NUM> and the upper ring member <NUM> may be guaranteed, and the assembling is performed successfully.

In this embodiment, particularly, the non-metal lower ring member is a plastic lower ring member, and the non-metal upper ring member is a plastic upper ring member. The lower ring member <NUM> and the upper ring member <NUM> which are made of the plastic material are lighter in weight, are prone to be manufactured, and are lower in cost.

Preferably, the magnetic central column <NUM> is a soft magnetic central column.

More preferably, the soft magnetic central column is a low-carbon steel central column.

Embodiments of the present invention further provide a method for assembling radial magnetic structure which includes following steps:.

In assembling process of the radial magnetic structure assembly in the embodiment of the present invention, each tile-shaped magnet <NUM> is annularly and uniformly arranged on the limit step <NUM> formed at the joint of the large-diameter section <NUM> and the small-diameter section <NUM> firstly, then, the lower ring member <NUM> is sleeved to limit the radial displacement of each tile-shaped magnet <NUM>; or alternatively, the lower ring member <NUM> may be sleeved on the large-diameter section <NUM>, then, each tile-shaped magnet <NUM> is annularly and uniformly arranged in the space formed between the limit step <NUM> and the lower sleeve ring member <NUM>, in this way, limiting of the radial displacement of each tile-shaped magnet <NUM> is realized through the lower ring member <NUM>. Then, the upper axial magnetic sheet <NUM> is pressed against the upper axial side surface of each tile-shaped magnet <NUM> through the upper ring member <NUM> to enable each tile-shaped magnet <NUM> to be secured with the upper axial magnetic sheet <NUM>; finally, the upper axial magnetic sheet <NUM> is turned over, and the lower axial magnetic sheet <NUM> is further pressed tightly on the lower axial side surface of each tile-shaped magnet <NUM> through the upper ring member <NUM> to enable each tile-shaped magnet <NUM> to be secured with the lower axial magnetic sheet <NUM>. In this way, in the assembling process, even though a repulsive magnetic force is generated between each tile-shaped magnet <NUM> and the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM>, due to the fact that each tile-shaped magnet <NUM> is limited by the lower ring member <NUM> and the upper ring member <NUM> in the radial direction and in the axial direction, the processing difficulty may be effectively reduced, the manufacturing efficiency may be effectively improved in batch production, and therefore a large amount of manpower and assembly cost may be saved.

In this embodiment, in the step S3, a quick-drying type glue is coated on the upper axial side surface of each tile-shaped magnet <NUM>, such that the upper axial magnetic sheet <NUM> is secured with each tile-shaped magnet <NUM>; in the step S5, the quick-drying type glue is coated on the lower axial side surface of each tile-shaped magnet <NUM>, such that the lower axial magnetic sheet <NUM> is secured with each tile-shaped magnet <NUM>. Particularly, the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM> are fixedly connected with each tile-shaped magnet <NUM> through the quick-drying type glue, not only quick assembly may be realized, but also the stability of the connection between the upper axial magnetic sheet <NUM>, the lower axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> that have been assembled is excellent.

In this embodiment, the quick-drying type glue is preferably A/B glue or anaerobic glue. Of course, in other embodiments, the quick-drying type glue may also be yellow glue or white glue.

In this embodiment, in the step S4, a sleeve <NUM> is provided, and the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> that have been assembled are pushed out of the small-diameter section <NUM> through the sleeve <NUM>; in the step S6, the lower axial magnetic sheet <NUM>, the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> that have been assembled are pushed out of the small-diameter section <NUM> through the sleeve <NUM>. Particularly, since the upper axial magnetic sheet <NUM> and the lower axial magnetic sheet <NUM> need to be assembled with the upper axial side surface and the lower axial side surface of the annularly and uniformly arranged tile-shaped magnet <NUM> respectively, the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> need to be taken out after assembling of the upper axial direction magnetic sheet <NUM> and the upper axial side surface of each tile-shaped magnet <NUM> is completed; at this moment, the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> are pushed by the sleeve <NUM> until the upper axial magnetic sheet <NUM> and each tile-shaped magnet <NUM> are separated from the small-diameter section <NUM>; the upper axial magnetic sheet <NUM> is turned over, each tile-shaped magnet <NUM> connected with the upper axial magnetic sheet <NUM> is also turned over simultaneously, then, the upper axial magnetic sheet <NUM> is sleeved on the small-diameter section <NUM> until the upper axial magnetic sheet <NUM> is abutted against the limit step <NUM>, at this moment, the assembling of the lower axial magnetic sheet <NUM> is further performed, the method of assembling the lower axial magnetic sheet <NUM> is the same as the method of assembling the upper axial magnetic sheet <NUM>, it is not repeatedly described here.

In this embodiment, one end of the lower sleeve ring member <NUM> is provided with a sealing plate <NUM>, and an end of the large-diameter section <NUM> abuts against an inner side of the sealing plate <NUM>. Particularly, when the lower ring member <NUM> is sleeved on the tile-shaped magnet <NUM> in the direction from the large-diameter section <NUM> to the small-diameter section <NUM>, there is no need to control the depth of sleeving of the lower ring member <NUM>, the lower ring member <NUM> is directly pushed until the inner side of the sealing plate <NUM> of the lower ring member <NUM> abuts against the end of the large-diameter section <NUM>, thus, the assembling efficiency is higher, and the assembling accuracy may also be guaranteed. The sealing plate <NUM> and the lower sleeve ring member <NUM> are preferably designed to be integrally shaped.

Claim 1:
A radial magnetic structure assembly configured to mount an upper axial magnetic sheet (<NUM>) and a lower axial magnetic sheet (<NUM>) respectively on an upper axial side surface and a lower axial side surface of each of a plurality of tile-shaped magnets (<NUM>), characterized in that, the radial magnetic structure assembly comprises: a magnetic central column (<NUM>), and a lower ring member (<NUM>) and an upper ring member (<NUM>) sleeved on the magnetic central column (<NUM>); wherein the magnetic central column (<NUM>) comprises a large-diameter section (<NUM>) and a small-diameter section (<NUM>) connected in sequence, and the radial magnetic structure assembly further comprises a limit step (<NUM>) provided at a joint of the large-diameter section (<NUM>) and the small-diameter section (<NUM>), and the plurality of tile-shaped magnets (<NUM>) are annularly and uniformly arranged on the limit step (<NUM>); the lower ring member (<NUM>) is configured to be sleeved on the tile-shaped magnet (<NUM>) in a direction from the large-diameter section (<NUM>) towards the small-diameter section (<NUM>) to limit a radial displacement of each tile-shaped magnet (<NUM>), the upper ring member (<NUM>) is configured to:
be sleeved on the tile-shaped magnet (<NUM>) in a direction from the small-diameter section (<NUM>) towards the large-diameter section (<NUM>) to press the upper axial magnetic sheet (<NUM>) against the upper axial side surface of each tile-shaped magnet (<NUM>) to secure each tile-shaped magnet (<NUM>) with the upper axial magnetic sheet (<NUM>), and to press the lower axial magnetic sheet (<NUM>) against the lower axial side surface of each tile-shaped magnet (<NUM>);
wherein the lower ring member (<NUM>) and the upper ring member (<NUM>) are made of non-metallic materials; one end of the lower ring member (<NUM>) is provided with a sealing plate (<NUM>), and one end of the large-diameter section (<NUM>) abuts against an inner side of the sealing plate (<NUM>).