CN111163409A

CN111163409A - Loudspeaker monomer and loudspeaker module

Info

Publication number: CN111163409A
Application number: CN202010079355.XA
Authority: CN
Inventors: 赵国栋; 宋健; 郑泽东
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-02-03
Filing date: 2020-02-03
Publication date: 2020-05-15

Abstract

The invention discloses a loudspeaker monomer and a loudspeaker module, wherein the loudspeaker monomer comprises a central magnet, a concave hole is formed in the middle area of the central magnet, the concave hole penetrates through the central magnet along the thickness direction of the central magnet, or the concave hole is a blind hole with the depth extending along the thickness direction of the central magnet. The technical scheme of the invention can reduce the magnetic flux leakage phenomenon.

Description

Loudspeaker monomer and loudspeaker module

Technical Field

The invention relates to the technical field of acoustic energy conversion, in particular to a loudspeaker single body and a loudspeaker module.

Background

The conventional speaker includes a magnetic yoke and a magnet coupled to one side of the magnetic yoke, which inevitably causes the magnetic yoke surface and the front cover surface of the speaker to have high magnetic leakage, which is a common feature of the speakers widely used at present. Because the loudspeaker has higher magnetic leakage, when the loudspeaker is placed near a product such as a mobile phone upper end or a Pad with a camera, the normal work of the camera can be influenced by the high magnetic leakage.

Disclosure of Invention

The invention mainly aims to provide a loudspeaker single body and a loudspeaker module, aiming at reducing the magnetic flux leakage phenomenon of a loudspeaker.

In order to achieve the above object, the speaker unit provided by the present invention includes a central magnet, and a concave hole is formed in a middle area of the central magnet, wherein the concave hole penetrates through the central magnet along a thickness direction of the central magnet, or the concave hole is a blind hole having a depth extending along the thickness direction of the central magnet.

Optionally, the volume of the recess is 4% -60% of the volume of the central magnet without opening.

Optionally, the concave hole is a square hole, the central magnet is a square magnet, the length direction of the concave hole is the same as the length direction of the central magnet, and the width direction of the concave hole is the same as the width direction of the central magnet;

wherein the length of the concave hole is 20% -60% of the length of the central magnet; and/or the width of the concave hole is 20% -60% of the width of the central magnet;

or, the concave hole is a circular hole, the central magnet is a circular magnet, and the diameter of the concave hole is 20% -60% of that of the central magnet.

Optionally, the depth of the recessed hole is greater than or equal to 10% of the thickness of the central magnet.

Optionally, the shape of the recess is the same as the shape of the central magnet.

Optionally, the center of the recessed hole coincides with the center of the central magnet.

Optionally, the concave hole and the central magnet are both square, the length direction of the concave hole is the same as that of the central magnet, the width direction of the concave hole is the same as that of the central magnet, and the midpoint of any one side of the concave hole coincides with that of the corresponding one side of the central magnet.

Optionally, the length of the central magnet is greater than or equal to 5mm, the width is greater than or equal to 5mm, and the height is greater than or equal to 0.5 mm; and/or the length of the loudspeaker monomer is greater than or equal to 9mm, the width of the loudspeaker monomer is greater than or equal to 8mm, and the height of the loudspeaker monomer is greater than or equal to 1.6 mm.

The invention also provides a speaker module, comprising:

a housing having a receiving cavity; and the number of the first and second groups,

the speaker monomer, the speaker monomer accept in accept the chamber, and will it keeps apart into preceding sound chamber and back sound chamber to accept the chamber, the speaker monomer includes central magnet, the shrinkage pool has been seted up to the middle zone of central magnet, wherein, the shrinkage pool is followed the thickness direction of central magnet runs through central magnet, perhaps, the shrinkage pool is the degree of depth edge the blind hole that central magnet thickness direction extends.

According to the invention, the concave hole is formed in the middle area of the central magnet, so that the magnetic conduction volume of the central magnet is reduced, the magnetic flux of the central magnet is reduced, and the risk of magnetic flux leakage can be reduced. Meanwhile, the central magnet mainly acts by depending on the outer circle, namely the edge area, so that the influence of the concave hole on the performance of the whole central magnet is small in the middle area of the central magnet, and the requirement of the voice coil on the required magnetism can be still met. After the concave hole is formed in the central magnet, a part of the magnet saved in the hole can be processed and utilized again to be used as the central magnet of the miniature loudspeaker with smaller size; meanwhile, the central magnet with the hole in the middle is basically not different from the conventional central magnet in processing, raw materials can be saved, and the mass production performance is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is an exploded view of a speaker cell according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of the central magnet of FIG. 1;

FIG. 3 is a schematic sectional view taken at A-A in FIG. 2;

fig. 4 is a schematic sectional view at B-B in fig. 2.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Center magnet	50	Magnetic conductive yoke
11	Concave hole	60	Vibrating plate
				20	Central magnetic conduction plate	70	Shell body
30	Edge magnet	80	Vibrating diaphragm
				40	Edge magnetic conduction plate	90	Voice coil

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a loudspeaker single body and a loudspeaker module.

Referring to fig. 1 to 4, the speaker unit includes an auxiliary system, a vibration system and a magnetic circuit system. Wherein, the auxiliary system includes casing 70, and casing 70 is the open setting in both ends, and relative both ends are link up promptly. The vibration system is accommodated in the housing 70, the vibration system includes a diaphragm 80 and a voice coil 90 connected to each other, and the voice coil 90 is fixed to one side of the diaphragm 80. The diaphragm 80 includes a center portion, a corrugated portion surrounding the center portion, and a fixing portion surrounding the corrugated portion, and the diaphragm 80 may further include a vibration plate 60 coupled to the center portion. The magnetic circuit system includes a yoke 50, and the yoke 50 is provided with an inner magnetic path and an outer magnetic path, and a magnetic gap for accommodating the voice coil 90 is formed between the inner magnetic path and the outer magnetic path.

Specifically, the inner magnetic path includes a central magnet 10 and a central magnetic conductive plate 20, and the central magnetic conductive plate 20 is attached to the central magnet 10; the outer magnetic circuit comprises edge magnets 30 and edge magnetic conductive plates 40, wherein the edge magnets 30 are arranged at the periphery of the central magnet 10 at intervals; the edge magnetic conduction plates 40 are arranged at the periphery of the central magnetic conduction plate 20 at intervals; the gap between the central magnet 10 and the side magnet 30 and the gap between the central magnetic conductive plate 20 and the side magnetic conductive plate 40 together form a magnetic gap, and the voice coil 90 extends into the magnetic gap.

In the embodiment of the present invention, the central magnetic conductive plate 20 and the magnetic conductive yoke 50 are both complete plate structures, that is, no concave hole is formed on either of them.

Due to the existence of the magnetic circuit system, the magnetic leakage flux of the magnetic yoke 50 and the vibration plate 60 of the speaker unit is inevitably high, which is a common feature of the speaker unit widely used at present. Because the speaker monomer has higher magnetic leakage, when the speaker monomer is placed near a product such as a mobile phone upper end or a Pad with a camera for use, the normal operation of the camera can be influenced by the high magnetic leakage.

In view of this, in the embodiment of the present invention, a concave hole 11 is formed in a middle area of the central magnet 10, where the concave hole 11 penetrates through the central magnet 10 along a thickness direction of the central magnet 10, or the concave hole 11 is a blind hole having a depth extending along the thickness direction of the central magnet 10.

Specifically, the center magnet 10 has a middle region, which means a position centered on the center of the center magnet 10, and an edge region, which means a position near the edge of the center magnet 10, disposed around the middle region.

In one embodiment, the concave hole 11 penetrates through the central magnet 10 along the thickness direction of the central magnet 10, and the thickness direction of the central magnet 10 refers to the distribution direction of the central magnet 10 and the central magnetic conductive plate 20. In one embodiment, the recess 11 is a groove formed in the central magnet 10, and the notch of the groove may face the central magnetic conductive plate 20 or the magnetic conductive yoke 50.

In the present invention, the concave hole 11 is formed in the middle region of the center magnet 10, so that the magnetic conductive volume of the center magnet 10 is reduced, and thus the magnetic flux of the center magnet 10 is reduced, thereby reducing the risk of magnetic leakage. Meanwhile, since the central magnet 10 mainly functions by depending on the outer circle, i.e., the edge region, the recess 11 opened in the middle region of the central magnet 10 has less influence on the performance of the entire central magnet 10, and still satisfies the magnetic requirement of the voice coil 90. After the concave hole 11 is formed in the central magnet 10, a part of the magnet saved at the opening can be processed and utilized again to be used as the central magnet 10 of the miniature loudspeaker monomer with smaller size; meanwhile, the center magnet 10 with the hole in the middle is basically processed without difference from the conventional center magnet 10, so that raw materials can be saved, and the mass production is high.

In one embodiment, the volume of the concave hole is 4% to 60% of the volume of the central magnet without the hole, and more preferably, the volume of the concave hole is 4% to 40% of the volume of the central magnet without the hole. The central magnet is generally square or round, the concave hole can be square, round or other shapes, the shapes of the two can be the same or different, and the central magnet and the concave hole can be combined and matched according to requirements.

Specifically, the concave hole 11 is a square hole, the central magnet 10 is a square magnet, the length direction of the concave hole 11 is the same as the length direction of the central magnet 10, and the width direction of the concave hole 11 is the same as the width direction of the central magnet 10;

wherein, the length of the concave hole 11 is 20-60% of the length of the central magnet 10; and/or the width of the concave hole 11 is 20% -60% of the width of the central magnet 10.

As described above, the length of the recess 11 may be 20%, 40%, 55%, 60%, etc. of the length of the central magnet 10, and the width of the recess 11 may be 20%, 40%, 55%, 60%, etc. of the width of the central magnet 10.

In one embodiment, the depth of the concave hole 11 is greater than or equal to 10% of the thickness of the central magnet 10. Specifically, the depth of the concave hole 11 may be 10%, 20%, 25%, 50%, 60%, or 100% of the thickness of the center magnet 10. When the depth of the recess hole 11 is 100% of the thickness of the center magnet 10, the recess hole 11 penetrates the center magnet 10.

The effect of reducing the magnetic flux leakage phenomenon of the entire speaker unit after the concave hole 11 is opened will be described in detail with reference to the table. The data in the table are obtained by performing experiments according to the length, width and height dimensions of the speaker unit being 18.5 × 13.5 × 2.0mm, and the concave hole is a through hole.

Table one: relation table between central magnet opening size and magnetic leakage reduction effect

In the above table, BL means a magnetic field force or a driving force coefficient of the magnetic circuit system, and it is better to a certain extent that it is larger. The yoke surface 1cm means a distance of 1cm from the outside of the yoke 50, the column of the yoke surface 1cm means a leakage flux amount 1cm from the outside of the yoke 50, and the column of the diaphragm 60 surface 1cm means a leakage flux amount 1cm from the outside of the diaphragm 60. The open pore volume (cc) refers to the volume of the recess 11.

As is apparent from the table i, when the length and the width of the concave hole 11 are 20% to 60% of the length and the width of the central magnet 10, respectively, compared with the central magnet 10 without the concave hole 11, the magnetic flux leakage phenomenon of the speaker unit is significantly improved, and a better magnetic flux leakage reduction effect can be achieved for the whole speaker unit. Meanwhile, when the length and the width of the concave hole 11 are 20% -60% of the length and the width of the central magnet 10, the influence on the BL (magnetic field force or driving force) is small, the BL can be basically maintained at 0.923 or above, and the reduction range is small and can be basically ignored compared with 1.015 without opening the hole, so that the performance of the speaker monomer can still be ensured after the hole is opened.

Further, since the magnetic flux leakage reducing effect is good when the length and width of the recess hole 11 is 70% of the length and width of the center magnet 10, but the influence on BL is large, in the present invention, it is possible to achieve a good effect by limiting the length of the recess hole 11 to 60% or less of the length of the center magnet 10 and limiting the width of the recess hole 11 to 60% or less of the width of the center magnet 10.

In addition, for the loudspeaker monomer of other sizes, after experimental comparison, can derive, set up the length of shrinkage pool 11 as 20% -60% of center magnet 10 length, the width of shrinkage pool 11 sets up as 20% -60% of center magnet 10 width, the degree of depth of shrinkage pool 11 sets up to be greater than or equal to 10% of center magnet 10 thickness, can play better reduction magnetic leakage effect, reduce the influence to BL (driving force or magnetic field force coefficient).

In one embodiment, the shape of the concave hole 11 is the same as that of the central magnet 10. The same means that the shapes of the two are substantially the same, for example, when the central magnet 10 is square, the concave hole 11 is also square, and when two adjacent sides of the central magnet 10 are rounded, two adjacent sides of the concave hole 11 may not be rounded. Both the shapes of the concave hole 11 and the central magnet 10 are the same, so that after the concave hole 11 is formed, the interval between the hole edge of the concave hole 11 and the outer edge of the central magnet 10 is consistent along the circumference of the central magnet 10, namely, the width of each part of the edge area of the central magnet 10 is consistent, and therefore the edge area of the central magnet 10 can play a good acting force on the voice coil 90.

In one embodiment, the center of the concave hole 11 coincides with the center of the central magnet 10. Specifically, the concave hole 11 and the central magnet 10 are both square, specifically, the length direction of the concave hole 11 is the same as the length direction of the central magnet 10, the width direction of the concave hole 11 is the same as the width direction of the central magnet 10, and the midpoint of any one side of the concave hole 11 coincides with the midpoint of the corresponding side of the central magnet 10. The central magnet 10 thus formed is symmetrically disposed with the middle line in the longitudinal direction as the center line, and symmetrically disposed with the middle line in the width direction as the center line.

Optionally, the length of the central magnet 10 is greater than or equal to 5mm, the width is greater than or equal to 5mm, and the height is greater than or equal to 0.5 mm. The central magnet 10 functions by mainly relying on the outer turns, i.e. the edge area contributes more to the performance of the whole speaker unit, while the closer to the middle area, the less to the performance, therefore, the larger the outer dimension of the central magnet 10, the larger the dimension of the middle area, and therefore, the less the performance is affected after the middle area with larger dimension is perforated. In this embodiment, the length of the central magnet 10 is set to be greater than or equal to 5mm, the width is greater than or equal to 5mm, and the height is greater than or equal to 0.5mm, so that the size is large, and after the concave hole 11 is formed, the influence on the overall performance is small.

In the foregoing, the specific size of the concave hole 11 can be set as required, and the size of the concave hole 11 and the depth of the concave hole 11 are comprehensively considered according to the requirements on magnetic leakage and acoustic performance. When the concave hole 11 is a groove, the surface of the central magnet 10, on which the concave hole 11 is formed, is bonded to the magnetic yoke 50.

The length of the loudspeaker monomer is greater than or equal to 9mm, the width of the loudspeaker monomer is greater than or equal to 8mm, and the height of the loudspeaker monomer is greater than or equal to 1.6 mm. In the speaker unit having the size and above, the size of the central magnet 10 is larger, and the leakage magnetic flux is reduced more and the performance loss is reduced less after the concave hole 11 is formed.

The present invention further provides a speaker module, in an embodiment, the speaker module includes:

a housing having a receiving cavity;

the loudspeaker single body is accommodated in the accommodating cavity and separates the accommodating cavity into a front sound cavity and a rear sound cavity; and the number of the first and second groups,

please refer to the above embodiments for the structure of the speaker unit.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a loudspeaker monomer, its characterized in that includes the magnetic yoke, is fixed in central magnet on the magnetic yoke and be fixed in central magnetic conductive plate on the central magnet, the shrinkage pool has been seted up to the middle zone of central magnet, wherein, the shrinkage pool is followed the thickness direction of central magnet runs through central magnet, perhaps, the shrinkage pool is followed for the degree of depth the blind hole that central magnet thickness direction extends.

2. The speaker cell of claim 1, wherein the pocket volume is 4% to 60% of the volume of the central magnet that is not open.

3. The speaker unit as claimed in claim 2, wherein the recess is a square hole, the central magnet is a square magnet, the length direction of the recess is the same as the length direction of the central magnet, and the width direction of the recess is the same as the width direction of the central magnet;

4. The speaker cell of claim 1, wherein the recessed hole has a depth greater than or equal to 10% of the thickness of the central magnet.

5. The speaker cell as claimed in claim 1, wherein the recess is shaped to be the same as the central magnet.

6. The speaker cell of claim 5, wherein a center of the recessed aperture coincides with a center of the central magnet.

7. The speaker unit as claimed in claim 6, wherein the recess hole and the central magnet are each square, a length direction of the recess hole is the same as a length direction of the central magnet, a width direction of the recess hole is the same as a width direction of the central magnet, and a midpoint of any one side of the recess hole coincides with a midpoint of a corresponding one side of the central magnet.

8. The speaker cell as claimed in any one of claims 1 to 7, wherein the central magnet has a length greater than or equal to 5mm, a width greater than or equal to 5mm, and a height greater than or equal to 0.5 mm; and/or the length of the loudspeaker monomer is greater than or equal to 9mm, the width of the loudspeaker monomer is greater than or equal to 8mm, and the height of the loudspeaker monomer is greater than or equal to 1.6 mm.

9. The speaker unit as claimed in any one of claims 1 to 7, wherein the recess is a blind hole extending in depth in the thickness direction of the central magnet, and the surface of the central magnet on which the recess is formed is fixed to the yoke.

10. A speaker module, comprising:

the speaker unit as claimed in any one of claims 1 to 9, wherein the speaker unit is accommodated in the accommodation chamber and separates the accommodation chamber into a front acoustic chamber and a rear acoustic chamber.