CN106792402B

CN106792402B - Moving-magnetic loudspeaker

Info

Publication number: CN106792402B
Application number: CN201710162676.4A
Authority: CN
Inventors: 汲鹏程; 祖峰磊; 许超
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2017-03-18
Filing date: 2017-03-18
Publication date: 2022-06-03
Anticipated expiration: 2037-03-18
Also published as: CN106792402A

Abstract

The invention discloses a moving-magnet loudspeaker, which relates to the technical field of electroacoustic products and comprises a shell, wherein a vibrating diaphragm and a voice coil which is arranged in parallel with the vibrating diaphragm are accommodated in the shell, and a driving magnet is fixed on one side of the vibrating diaphragm, which is close to the voice coil; and the voice coil forms an electromagnet after being electrified, and generates an interaction force with the driving magnet to drive the vibrating diaphragm to vibrate and sound. The moving-magnet loudspeaker solves the technical problems of poor high-frequency transient response and the like of the moving-coil loudspeaker in the prior art, has good high-frequency transient response, low F0, good sensitivity and high overall performance, and can meet the performance requirements of high-fidelity equipment.

Description

Moving-magnetic loudspeaker

Technical Field

The invention relates to the technical field of electroacoustic products, in particular to a moving-magnet loudspeaker.

Background

A speaker is an important acoustic component of a portable electronic device, is used for converting an electric signal and a sound signal, and is an energy conversion device. The speaker that is arranged in portable electronic equipment at present is mostly moving coil loudspeaker, and moving coil loudspeaker's theory of operation is that the circular telegram voice coil loudspeaker voice coil receives the effect of ampere force in magnetic field, drives vibrating diaphragm vibration sound production, because the problem of its principle, moving coil loudspeaker hardly has the promotion on high frequency transient response, and high frequency performance is lower, can not satisfy the performance requirement of present Hi-Fi (high-fidelity) equipment.

Disclosure of Invention

In view of the above drawbacks, the present invention provides a moving-magnet speaker, which has good high-frequency transient response, low F0 (resonant frequency), and high overall performance.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a moving-magnet loudspeaker comprises a shell, wherein a vibrating diaphragm and a voice coil arranged in parallel with the vibrating diaphragm are accommodated in the shell, and a driving magnet is fixed on one side, close to the voice coil, of the vibrating diaphragm; and the voice coil forms an electromagnet after being electrified, and generates an interaction force with the driving magnet to drive the vibrating diaphragm to vibrate and sound.

The armature is arranged opposite to the driving magnet, and the armature changes the magnetization direction of the armature according to the change of the current direction passing through the voice coil; the armature and the voice coil together form the electromagnet.

The voice coil is provided with a center hole, wherein the voice coil is covered with a magnetic conduction component, and the position of the magnetic conduction component corresponding to the center hole of the voice coil is provided with an avoidance hole.

The vibrating diaphragm comprises a folding ring, the edge portion of the folding ring is fixed on the shell, a vibrating plate is arranged in the middle of the folding ring, and the driving magnet is fixed on the vibrating plate.

The folding rings are formed by connecting two sections of folding rings with opposite bending directions, one section of folding ring close to the vibrating plate is upwards protruded, and the radian of the folding ring is larger than that of the other section of folding ring.

The voice coil and the armature are fixed on the basin frame; the edge part of the folded ring is fixed on the upper end surface of the shell.

The inner side of the side wall of the shell is provided with a positioning boss extending towards the center of the shell, and the lower surface of the positioning boss is attached to the upper surface of the magnetic conduction component.

The voice coils are arranged in parallel, and the driving magnets are correspondingly arranged in two blocks.

Wherein, two voice coils share one magnetic conduction component.

The casing is of a rectangular structure, and the long edges of the voice coil, the driving magnet and the armature are all parallel to the long edge of the casing.

In one embodiment, the height of the armature is smaller than that of the voice coil, the size of the driving magnet is smaller than that of the central hole of the voice coil, and a vibration space is reserved between the driving magnet and the armature.

In another embodiment, the size of the driving magnet is equal to or larger than the size of the center hole of the voice coil, and a vibration space is left between the driving magnet and the magnetic conductive member.

After the technical scheme is adopted, the invention has the beneficial effects that:

because the moving-magnet loudspeaker comprises a shell, a vibrating diaphragm and a voice coil arranged in parallel with the vibrating diaphragm are accommodated in the shell, and a driving magnet is fixed on one side of the vibrating diaphragm, which is close to the voice coil; the voice coil forms the electro-magnet after the circular telegram, produces the interact power drive vibrating diaphragm vibration sound production with drive magnet. The loudspeaker is a moving-magnet loudspeaker, when a voice coil passes through alternating audio current, the voice coil can form an electromagnet, repulsive force or attractive force of interaction can be generated between the electromagnet and a driving magnet, the driving magnet can vibrate up and down due to the fact that the voice coil is fixed, a vibrating diaphragm vibrates up and down along with the driving magnet, air is driven to sound, the function of the loudspeaker is achieved, ampere force generated by cutting a magnetic induction line by the original voice coil is changed into acting force between the electromagnet and a permanent magnet, the situation that the high-frequency transient response of the moving-coil loudspeaker is poor is improved according to the principle, and the high-frequency performance is improved; meanwhile, F0 of the loudspeaker can be made to be very low, the sensitivity is high, the loudspeaker can be made to be a larger loudspeaker, and the application range is wide.

Because the central hole of each voice coil is internally provided with the armature which is arranged opposite to the driving magnet, the armature changes the magnetization direction of the armature according to the change of the current direction passing through the voice coil. The armature can be magnetized when the voice coil is electrified, the voice coil and the armature jointly form an electromagnet, the magnetic field intensity generated by the voice coil is increased, the acting force between the voice coil and the driving magnet is enhanced, and the sensitivity of the loudspeaker can be improved.

Because the voice coil is provided with the magnetic conduction component, the magnetic conduction component can gather the magnetic field generated by the voice coil inwards, the magnetic leakage is reduced, the magnetic field intensity can be effectively improved, and the sensitivity of the loudspeaker can be further improved.

Because voice coil loudspeaker voice coil and drive magnet all are equipped with two, can be so that the vibrating diaphragm atress is more even, improved the vibration stability and the equilibrium of vibrating diaphragm, prevent the vibrating diaphragm polarization.

Because be equipped with the location boss on the inner wall of casing, when the speaker assembly, the location boss can play the positioning action, can reduce the assembly degree of difficulty, improves the product uniformity, and the boss of fixing a position is laminated with the magnetic conduction part mutually simultaneously, can increase the joint strength of casing and magnetic conduction part, voice coil loudspeaker voice coil and basin frame, has reduced the risk that magnetic conduction part, voice coil loudspeaker voice coil and basin frame drop from the casing, has improved the reliability and the life of product.

Because the vibrating diaphragm is formed by two sections of folding rings with opposite bending directions, and the folding rings are formed by two sections of folding rings with opposite bending directions, the supporting resilience of the folding rings can be effectively increased when the vibrating diaphragm vibrates, and the defect that the vibrating diaphragm collapses downwards is effectively improved.

In conclusion, the moving-magnet loudspeaker solves the technical problems of poor high-frequency transient response and the like of the moving-coil loudspeaker in the prior art, has good high-frequency transient response, low F0, good sensitivity and high overall performance, and can meet the performance requirements of high-fidelity equipment.

Drawings

Fig. 1 is an exploded schematic view of a moving-magnet speaker according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a moving-magnet speaker according to a first embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a moving-magnet speaker according to a second embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a moving-magnet speaker according to a third embodiment of the present invention;

FIG. 5 is a schematic diagram of the working principle of the moving-magnet speaker of the present invention;

in the figure: 10. the loudspeaker comprises a shell, 12, a positioning boss, 20, a vibrating plate, 22, a folding ring, 24a, a driving magnet, 24b, a driving magnet, 24c, a driving magnet, 30, a basin frame, 32, a magnetic conducting component, 320, an avoiding hole, 34, a voice coil, 36, an armature, 40, an FPCB, 50-58 and an arrow.

Detailed Description

The invention is further illustrated below with reference to the figures and examples.

All directions referred to in this specification refer to directions in which the diaphragm is located, and all directions refer to directions in which the voice coil is located. The inner side referred to in this specification means a side close to the center of the moving-magnet speaker, and the outer side means a side far from the center of the moving-magnet speaker.

The first embodiment is as follows:

as shown in fig. 1 and 2, a moving-magnet speaker has a rectangular parallelepiped structure and includes a rectangular annular housing 10 with openings at upper and lower ends. A vibrating diaphragm and a voice coil 34 arranged in parallel with the vibrating diaphragm are accommodated in the shell 10, and a driving magnet 24a is fixed on one side of the vibrating diaphragm close to the voice coil 34; the voice coil 34 is energized to form an electromagnet, and generates an interaction force with the driving magnet 24a to drive the diaphragm to vibrate and generate sound. In the present embodiment, a plate-shaped frame 30 is coupled to a lower end surface of the housing 10, the voice coil 34 is fixed to a portion of the frame 30 located in the housing 10, an armature 36 is disposed in a central hole of the voice coil 34, and the armature 36 is also fixed to the frame 30. The diaphragm is arranged above the voice coil 34, the diaphragm includes a corrugated rim 22 with an edge portion fixed on the upper end surface of the casing 10, the diaphragm 20 is fixed in the middle of the corrugated rim 22, the driving magnet 24a is fixed on one side of the diaphragm 20 close to the voice coil 34, the magnetization directions of the driving magnet 24a are vertical, and the driving magnet 24a is arranged opposite to the armature 36. As shown in fig. 1 and 2, in the present embodiment, two voice coils 34 are preferably provided side by side, and two drive magnets 24a are provided correspondingly. The two voice coils 34 are in a racetrack structure, the long sides of the two voice coils 34 are in contact, the central hole of the voice coil 34 is a long hole, the armature 36 arranged in the central hole and the driving magnet 24a corresponding to the armature 36 are both in a long strip structure, that is, the long sides of the voice coil 34, the driving magnet 24a and the armature 36 are all parallel to the long side of the casing 10.

As shown in fig. 1 and 2, the voice coil 34 is covered with a plate-shaped magnetic conductive member 32, the shape and size of the magnetic conductive member 32 are adapted to the shape and size of the voice coil 34, and an avoiding hole 320 is formed at a position of the magnetic conductive member 32 corresponding to the center hole of the voice coil 34. In the present embodiment, it is preferable that the two voice coils 34 share one magnetic conductive member 32, and the magnetic conductive member 32 can converge the magnetic field generated by the voice coils 34 toward the center hole of the voice coils 34, thereby reducing the leakage flux.

As shown in fig. 1 and 2, the height of the armature 36 is smaller than that of the voice coil 34 in this embodiment, i.e., there is a certain difference between the upper surface of the armature 36 and the upper surface of the voice coil 34. The size of the driving magnet 24a is smaller than the size of the center hole of the voice coil 34, and the driving magnet 24a has a structure in which the height is larger than the width, the lower surface of the driving magnet 24a is substantially flush with the upper surface of the voice coil 34, and a vibration space is left between the driving magnet 24a and the armature 36.

As shown in fig. 1 and fig. 2, the folding ring 22 is formed by connecting two sections of folding rings with opposite folding directions, i.e. the folding ring 22 is formed by connecting a section of folding ring protruding upwards and a section of folding ring protruding downwards. In the present embodiment, it is preferable that the section of the folding ring located at the inner side, that is, the section of the folding ring close to the vibrating plate 20, is protruded upward, the section of the folding ring located at the outer side is protruded downward, and the radian of the upward protruded folding ring is greater than that of the downward protruded folding ring.

As shown in fig. 1 and fig. 2, the inner side of the side wall of the casing 10 is provided with a positioning boss 12 extending horizontally toward the center of the casing 10, and in this embodiment, it is preferable that the positioning bosses 12 are provided on all four side walls of the casing 10, and two positioning bosses 12 are provided on the side wall of the short side of the casing 10, and the two positioning bosses 12 correspond to the two voice coils 34, respectively. The positioning boss 12 is pressed on the magnetic conductive member 32, that is, the lower surface of the positioning boss 12 is attached and fixed to the upper surface of the magnetic conductive member 32.

As shown in fig. 1, the moving-magnet speaker of the present invention further includes two FPCBs (flexible printed circuit boards) 40 for electrically connecting the voice coil 34 with an external audio circuit.

The second embodiment:

the present embodiment is substantially the same as the first embodiment, and the differences are:

as shown in fig. 3, the height of the driving magnet 24b is larger, and the lower surface thereof exceeds the upper surface of the voice coil 34, that is, the lower end of the driving magnet 24b is inserted into the center hole of the voice coil 34, and a vibration space is left between the driving magnet 24b and the armature 36.

Example three:

this embodiment is substantially the same as the first embodiment, except that:

as shown in fig. 4, the size of the driving magnet 24c is equal to the size of the center hole of the voice coil 34, or the size of the driving magnet 24c is larger than the size of the center hole of the voice coil 34, and the height of the driving magnet 24c is smaller than the width thereof, so that the driving magnet 24c has a flat structure.

As shown in fig. 5, the working principle of the moving-magnet speaker of the present invention is as follows:

taking the moving-magnet speaker described in the first embodiment as an example, the vibration direction of the diaphragm is in the vertical direction, wherein £ and |, indicate that the current flow direction in the voice coil 34, indicates that the current flow direction is out of the paper, and indicates that the current flow direction is in the paper. In the present embodiment, it is preferable that the energizing current directions of the voice coils 34 are opposite to each other, and the polarities of the drive magnets 24a are also opposite to each other, and the upper end of the drive magnet 24a positioned on the left side is set to the S pole, the lower end thereof is set to the N pole, and the upper end of the drive magnet 24a positioned on the right side is set to the N pole, and the lower end thereof is set to the S pole. However, the present invention is not limited to this, and in actual use, the directions of the currents flowing through the voice coils 34 may be the same, and the polarities of the drive magnets 24a may be the same. The direction of the current flow for the two voice coils 34 is shown, according to the right-hand rule, the voice coil 34 on the left side generates an upward magnetic field, as shown by arrow 52, the upper end of the armature 36 at the center of the voice coil 34 is N-pole and is repelled from the drive magnet 24a on the left side, and the direction of movement of the drive magnet 24a on the left side is upward, as shown by arrow 56; at this time, the voice coil 34 on the right side generates a downward magnetic field as indicated by an arrow 50, the upper end of the armature 36 at the center of the voice coil 34 is an S pole and is repelled from the driving magnet 24a on the right side, and the driving magnet 24a on the right side also moves upward as indicated by an arrow 54, so that the diaphragm moves upward as indicated by an arrow 58. When the current passing through the two voice coils 34 is reversed, the diaphragm will move downwards, so as to realize vibration sounding.

The moving-magnet loudspeaker fixes the voice coil, the magnet is adhered to the vibrating diaphragm, the vibrating diaphragm is driven to vibrate and sound through the movement of the magnet, the ampere force generated by cutting the magnetic induction line by the voice coil in the prior driving principle is changed into the acting force between the electromagnet and the permanent magnet, the problem of poor high-frequency transient response of the moving-coil loudspeaker is effectively improved in principle, the performance of the loudspeaker is improved, and the high-frequency transient response of the moving-coil loudspeaker can meet the performance requirement of high-fidelity equipment.

The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.

Claims

1. The moving-magnet loudspeaker comprises a shell, and is characterized in that a vibrating diaphragm and a voice coil arranged in parallel with the vibrating diaphragm are accommodated in the shell;

a driving magnet is fixed on one side of the vibrating diaphragm close to the voice coil;

the voice coil is electrified to form an electromagnet, and an interaction force is generated between the electromagnet and the driving magnet to drive the vibrating diaphragm to vibrate and sound;

an armature is arranged in a central hole of the voice coil, the armature is arranged opposite to the driving magnet, and the armature changes the magnetization direction of the armature according to the change of the current direction passing through the voice coil; the armature and the voice coil jointly form the electromagnet;

the voice coils are arranged side by side, a magnetic conduction component covers the voice coils, the two voice coils share one magnetic conduction component, and avoidance holes are formed in the positions, corresponding to the center holes of the voice coils, of the magnetic conduction components; two driving magnets are correspondingly arranged.

2. The moving-magnet speaker as claimed in claim 1, wherein the diaphragm includes a corrugated rim having an edge portion fixed to the housing, a vibrating plate is provided in a middle portion of the corrugated rim, and the driving magnet is fixed to the vibrating plate.

3. The moving-magnet loudspeaker according to claim 2 wherein the edge is formed by connecting two edge segments with opposite bending directions, and the edge adjacent to the diaphragm is convex upward and has a larger curvature than the other edge.

4. The moving-magnet loudspeaker according to claim 2 wherein the housing is an annular structure with two open ends, a frame is combined on the lower end face of the housing, and the voice coil and the armature are fixed on the frame; the edge part of the folded ring is fixed on the upper end surface of the shell.

5. The moving-magnet loudspeaker according to claim 4 wherein a positioning boss is provided on an inner side of the side wall of the housing and extends toward the center of the housing, and a lower surface of the positioning boss is in contact with an upper surface of the magnetic conductive member.

6. The moving-magnet loudspeaker according to any one of claims 1 to 5 wherein the housing is rectangular in configuration and the long sides of the voice coil, the drive magnet and the armature are all parallel to the long sides of the housing.

7. The moving-magnet loudspeaker according to any one of claims 1 to 5 wherein the height of the armature is less than the height of the voice coil, the size of the drive magnet is less than the size of the central hole of the voice coil, and a vibration space is left between the drive magnet and the armature.

8. The moving-magnet loudspeaker according to any one of claims 1 to 5 wherein the size of the drive magnet is the same as or larger than the size of the center hole of the voice coil, and a vibration space is left between the drive magnet and the magnetically conductive member.