CN115103279A

CN115103279A - Sound production device and terminal equipment

Info

Publication number: CN115103279A
Application number: CN202210903861.5A
Authority: CN
Inventors: 高岩; 李世田; 张凯; 张迪
Original assignee: Weifang Geldanna Electronic Technology Co ltd
Current assignee: Weifang Geldanna Electronic Technology Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-23
Also published as: WO2024022489A1

Abstract

The invention discloses a sound generating device and terminal equipment, the sound generating device comprises a basin frame, a magnetic circuit system and a vibration system, the magnetic circuit system comprises a U-shaped iron, an inner magnetic circuit part and an outer magnetic circuit part, the inner magnetic circuit part is arranged in an accommodating groove of the U-shaped iron, the outer magnetic circuit part is arranged on a supporting surface of the U-shaped iron and is connected with the basin frame, the outer magnetic circuit part is matched with the U-shaped iron to cover an opening at one end of an accommodating cavity, the side wall of the accommodating groove and the outer magnetic circuit part are separated from the inner magnetic circuit part to form a magnetic gap, a notch groove is formed in one side of the inner magnetic circuit part facing the magnetic gap, the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is connected with the basin frame and covers the opening at the other end of the accommodating cavity, and one end, far away from the vibrating diaphragm, is suspended in the magnetic gap. The invention aims to provide a sound generating device which ensures a good BL value and a good linear range, not only effectively reduces the weight and ensures the good BL value and the good linear range, but also can meet the design requirements of miniaturization and light weight.

Description

Sound production device and terminal equipment

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a sound generating device and terminal equipment using the same.

Background

A horn, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy through some physical effect. When the electron energy of difference passed to the voice coil loudspeaker voice coil, the voice coil loudspeaker voice coil produced the magnetic field interaction of an energy and magnet, and this kind of interaction causes the vibrating diaphragm vibration, because electron energy changes at any time, and the voice coil loudspeaker voice coil can be forward or backward motion, therefore the vibrating diaphragm of loudspeaker will follow the motion, and this action makes the density degree of air produce the change and produce sound.

In the correlation technique, the washer of speaker is mostly cylindric or ring form, bonds on magnet through glue, constitutes the magnetic circuit of speaker with U iron or T iron. The washer plays a role of magnetic conduction, and forms a magnetic loop with the U iron or the T iron and the magnet, so that the electrified voice coil performs cutting magnetic induction line motion in the magnetic loop, and the vibrating diaphragm is driven to vibrate and sound. However, the disk-shaped or annular washer has a low magnetic permeability in a partial region, and the remaining region with a low magnetic permeability increases the weight of the washer, and thus cannot satisfy the design requirements of miniaturization and light weight, and has a problem of poor BL value and linearity range.

Disclosure of Invention

The invention aims to provide a sound generating device and terminal equipment, and aims to provide a sound generating device which can ensure good BL value and linear range, not only effectively reduce weight and ensure good BL value and linear range, but also meet the design requirements of miniaturization and light weight.

In order to achieve the above object, the present invention provides a sound generating device, including:

the basin stand is provided with a containing cavity with two open ends;

the magnetic circuit system comprises a U-shaped iron, an inner magnetic circuit part and an outer magnetic circuit part, wherein the U-shaped iron is provided with an accommodating groove, the inner magnetic circuit part is arranged in the accommodating groove, the end face of the U-shaped iron, which is adjacent to the notch of the accommodating groove, forms a supporting surface, the outer magnetic circuit part is arranged on the supporting surface and is connected with the basin frame, the outer magnetic circuit part is matched with the U-shaped iron to cover an opening at one end of the accommodating cavity, the side wall of the accommodating groove and the outer magnetic circuit part are separated from the inner magnetic circuit part to form a magnetic gap, and a notch groove is arranged on one side of the inner magnetic circuit part, which faces the magnetic gap; and

the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is connected to the basin frame and covers the opening at the other end of the accommodating cavity, and the voice coil is far away from one end of the vibrating diaphragm and is suspended in the magnetic gap.

In an embodiment, the inner magnetic circuit portion comprises an inner magnet and an inner washer which are stacked, the inner magnet is clamped between the inner washer and the bottom wall of the accommodating groove, and the side, facing the magnetic gap, of the inner washer is provided with the notch groove;

the outer magnet circuit part comprises an outer magnet and an outer washer which are arranged in a stacked mode, the outer magnet is clamped between the outer washer and the supporting surface, and the outer washer is connected with the basin frame.

In one embodiment, a concave groove is formed in one side, back to the inner magnet, of the inner washer.

In one embodiment, the thickness of the inner magnet is defined as h1, the thickness of the outer magnet is defined as h2, wherein 0.8 ≤ h1/h2 ≤ 1.2;

and/or defining the maximum thickness of the inner washer as t1 and the thickness of the outer washer as t2, wherein t1/t2 is more than or equal to 2.5;

and/or the radius of the inner washer is defined as d1, the width of the outer washer is defined as d2, wherein d1/d2 is more than or equal to 1.5 and less than or equal to 2;

and/or the cross section of the concave groove is semicircular, the radius of the concave groove is defined as R, the maximum thickness of the inner washer is defined as t1, the radius of the inner washer is defined as d1, and t1 is greater than R and is less than d 1.

In one embodiment, the notch groove extends along the periphery of the inner washer;

and/or the notch groove is arranged adjacent to the inner magnet;

and/or, one side of the outer washer, which is back to the magnetic gap, is convexly provided with a limiting bulge, the basin frame is provided with a limiting groove, and the limiting bulge is accommodated and limited in the limiting groove.

In an embodiment, the inner magnetic circuit portion further comprises a short circuit ring, the short circuit ring comprises a first section and a second section which are arranged at an included angle, the first section is connected with one side, back to the inner magnet, of the inner washer, the second section is attached to one side, facing the magnetic gap, of the inner washer and extends to the inner magnet to cover the notch groove.

In one embodiment, a length of the notched groove along the magnetic gap axis is defined as a, and a length of the notched groove along a direction perpendicular to the magnetic gap axis is defined as b; wherein, a/b is more than or equal to 1.8 and less than or equal to 2.2.

In one embodiment, a boss is convexly arranged on the bottom wall of the accommodating groove, the boss is spaced from the side wall of the accommodating groove and surrounds to form an avoiding groove communicated with the accommodating groove, the avoiding groove corresponds to the magnetic gap, and the inner magnetic circuit part is supported on the boss;

and/or a groove is concavely arranged on one side of the U-shaped iron, which is back to the notch of the accommodating groove.

In an embodiment, the vibration system further comprises a centering ring, the inner side of the centering ring is connected with the outer wall of the voice coil, the frame is convexly provided with a fixed table, and the outer side of the centering ring is connected with the fixed table;

and/or the U-shaped iron is adjacent to the supporting surface and extends towards one side departing from the accommodating groove to form a supporting platform, the supporting platform is flush with the supporting surface, and the outer magnetic circuit part is supported on the supporting surface and the supporting platform.

The invention further provides terminal equipment which comprises an equipment shell and the sound generating device, wherein the sound generating device is arranged on the equipment shell.

According to the sound production device, the containing cavities with openings at two ends are arranged in the basin frame, so that the basin frame is used for installing, fixing and protecting the magnetic circuit system and the vibration system, the magnetic circuit system is arranged into the U-shaped iron, the inner magnetic circuit part and the outer magnetic circuit part, the containing groove of the U-shaped iron is used for installing and fixing the inner magnetic circuit part, the outer magnetic circuit part is arranged on the supporting surface of the U-shaped iron, the inner magnetic circuit part, the side wall of the containing groove of the U-shaped iron and the outer magnetic circuit part are enclosed to form a magnetic gap for the suspension of a voice coil of the vibration system, and therefore after the voice coil is electrified, the voice coil performs motion of cutting a magnetic induction line in the magnetic gap of the magnetic circuit system, and the vibration diaphragm is driven to produce sound; the gap groove is formed in one side, facing the magnetic gap, of the inner magnetic circuit part, so that the part with low magnetic permeability of the inner magnetic circuit part is eliminated, the weight of the inner magnetic circuit part is reduced, the part with high magnetic permeability of the inner magnetic circuit part is fully utilized, the good BL value and the linear range of the sound generating device are guaranteed, and meanwhile the design requirements of miniaturization and light weight can be met.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of 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 a schematic cross-sectional view of a sound generator according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a magnetic circuit system according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a magnetic circuit system according to an embodiment of the present invention;

FIG. 4 is an enlarged partial cross-sectional view of a magnetic circuit system according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a U-iron according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a simulated magnetic induction line of a portion of a magnetic circuit system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a simulation magnetic induction line of a partial magnetic circuit system in the prior art;

fig. 8 is a BL graph illustrating an exemplary sound generating apparatus according to the present invention and a prior art.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Sound producing device	222	Inner washer
1	Basin rack	2221	Notch groove
				11	Containing chamber	2222	Concave groove
12	Limiting groove	223	Short-circuit ring
				13	Fixing table	2231	First stage
2	Magnetic circuit system	2232	Second section
				21	U-shaped iron	23	Outer magnetic circuit portion
211	Containing groove	231	External magnet
				212	Support surface	232	Waihuasi
213	Boss	2321	Spacing protrusion
				214	Avoiding groove	24	Magnetic gap
215	Groove	3	Vibration system
				216	Supporting table	31	Vibrating diaphragm
22	Inner magnetic path section	32	Voice coil
				221	Internal magnet	33	Centering ring

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 obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

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

Also, the expression "and/or" and/or "as used throughout is meant to encompass three alternatives, exemplified by" A and/or B "including alternative A, alternative B, or both alternative A and alternative B.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are 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 of the 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.

A horn, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy through some physical effect. When different electronic energy reaches the voice coil loudspeaker voice coil of loudspeaker, the voice coil loudspeaker voice coil produced the magnetic field interaction of an energy and magnet, and this kind of interaction causes the vibrating diaphragm vibration, because electronic energy changes at any time, and the voice coil loudspeaker voice coil can move forward or backward, therefore the vibrating diaphragm of loudspeaker will follow the motion, and this action makes the density degree of air change and produces sound.

In the correlation technique, the washer of speaker is mostly cylindric or ring form, bonds on magnet through glue, constitutes the magnetic circuit of speaker with U iron or T iron. The washer plays a role of magnetic conduction, and forms a magnetic loop with the U iron or the T iron and the magnet, so that the electrified voice coil performs cutting magnetic induction line motion in the magnetic loop, and the vibrating diaphragm is driven to vibrate and sound. However, the disk-shaped or annular washer has a low magnetic permeability in a partial region, and the remaining region having a low magnetic permeability increases the weight of the washer, and thus cannot satisfy the design requirements of miniaturization and weight reduction, and has a problem of poor BL value and linearity range.

Based on the above-mentioned conception and problems, the present invention provides a sound generating device 100. It is understood that the sound generating apparatus 100 is applied to a terminal device, and the terminal device may be a sound box, a car sound box, and the like, and is not limited herein.

Referring to fig. 1 to 5, in an embodiment of the present invention, the sound generating apparatus 100 includes a frame 1, a magnetic circuit system 2 and a vibration system 3, wherein the frame 1 has a cavity 11 with two open ends, the magnetic circuit system 2 includes a U-iron 21, an inner magnetic circuit portion 22 and an outer magnetic circuit portion 23, the U-iron 21 has a receiving groove 211, the inner magnetic circuit portion 22 is disposed in the receiving groove 211, an end surface of the U-iron 21 adjacent to a notch of the receiving groove 211 forms a supporting surface 212, the outer magnetic circuit portion 23 is disposed on the supporting surface 212 and connected to the frame 1, the outer magnetic circuit portion 23 and the U-iron 21 cooperate to cover the opening of one end of the cavity 11, a side wall of the receiving groove 211 and the outer magnetic circuit portion 23 are spaced from the inner magnetic circuit portion 22 to form a magnetic gap 24, a side of the inner magnetic circuit portion 22 facing the magnetic gap 24 is provided with a notch 2221, the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, the diaphragm 31 is connected to the frame 1, and covers the opening at the other end of the cavity 11, and the end of the voice coil 32 away from the diaphragm 31 is suspended in the magnetic gap 24.

In the present embodiment, the frame 1 is used for mounting, fixing, supporting and protecting the components of the vibration system 3, the magnetic circuit system 2 and the like, that is, the frame 1 provides a mounting base for the components of the vibration system 3, the magnetic circuit system 2 and the like. It can be understood that the frame 1 may be a mounting shell, a housing or a box with the cavity 11, that is, the frame 1 defines a receiving space, which is not limited herein.

It will be appreciated that the frame 1 may alternatively be cylindrical, square or trumpet shaped. The cavity 11 of the frame 1 may be a cavity structure with an opening at one end, or certainly may be a cavity structure with openings at two ends, and optionally, the frame 1 may be a horn-shaped or basin-shaped structure with openings at two ends. In this embodiment, the basin frame 1 is a column or basin-shaped structure with two open ends, the magnetic circuit system 2 is disposed at one open end of the basin frame 1, and the periphery of the vibrating diaphragm 31 of the vibrating system 3 is fixedly connected with the other end of the basin frame 1, and covers the other open end, so that the vibrating diaphragm 31 is opposite to the magnetic circuit system 2, and encloses with the basin frame 1 to form a vibration space of the sound generating device 100.

In this embodiment, the magnetic circuit system 2 includes a U-shaped iron 21, an inner magnetic circuit portion 22 and an outer magnetic circuit portion 23, the U-shaped iron 21 is disposed in a U shape, the U-shaped iron 21 has a receiving slot 211 with an opening at one end, the U-shaped iron 21 is disposed at the opening at one end of the frame 1, the receiving slot 211 of the U-shaped iron 21 is communicated with the receiving cavity 11, a slot opening of the receiving slot 211 is opposite to the diaphragm 31, an end surface of the U-shaped iron 21 adjacent to the slot opening of the receiving slot 211 forms a supporting surface 212, the outer magnetic circuit portion 23 is disposed on the supporting surface 212 and connected to the frame 1, the inner magnetic circuit portion 22 is disposed in the receiving slot 211, such that a side wall of the receiving slot 211 and the outer magnetic circuit portion 23 are spaced from the inner magnetic circuit portion 22 to form a magnetic gap 24, the voice coil 32 of the vibration system 3 is disposed in the vibration space of the sound generating apparatus 100, such that one end of the voice coil 32 is connected to the diaphragm 31, the other end of the voice coil 32 is suspended in the magnetic gap 24, and such that when the voice coil 32 is energized, the voice coil 32 introduces electrical energy into the magnetic gap 24 of the magnetic circuit system 2, under magnetic circuit 2's magnetic field effect, drive voice coil 32 is the operation of cutting magnetic induction line, so with electric energy conversion mechanical energy, drive vibrating diaphragm 32 vibration during voice coil 32 motion to make vibrating diaphragm 32 vibration sound production, so convert mechanical energy into acoustic energy, realize electroacoustic conversion.

It can be understood that, when the frame 1 is a metal member, the magnetic circuit system 2 and the frame 1 are fixed by bonding or welding, so as to improve the heat dissipation effect of the sound generating device 100. In another embodiment, when the frame 1 is formed by plastic injection molding, the magnetic conductive plate of the outer magnetic circuit portion 23 of the magnetic circuit system 2 may also be injection molded in the frame 1 as an insert, or the magnetic circuit system 2 and the frame 1 are fixed by adhesion, and then the other portions are fixed by adhesion, which is not limited herein.

In this embodiment, the inner magnetic circuit portion 22 is disposed in the accommodating groove 211, so that the longitudinal space of the sound generating device 100 can be reduced, the product height can be reduced, the sound generating device can be used in a narrower space, the product miniaturization can be realized, and meanwhile, compared with the conventional design, the structure prevents the diaphragm 31 from interfering with the magnetic circuit system 2 during the large-amplitude work. While the outer magnetic path portion 23 is provided on the support face 212 formed by the end face of the U-bar 21 adjacent to the notch of the receiving groove 211, thereby further increasing the magnetic field strength.

In the present embodiment, as shown in fig. 1 to 4, by mounting the fixed outer magnetic circuit portion 23 on the end surface of the U-iron 21 and disposing the inner magnetic circuit portion 22 in the accommodation groove 211 of the U-iron 21, the magnetic field strength and the magnetic flux density are increased by the inner magnetic circuit portion 22 together with the outer magnetic circuit portion 23 and the U-iron 21 to increase the driving force to the voice coil 32. Meanwhile, the notched groove 2221 is formed in the side of the inner magnetic path portion 22 facing the magnetic gap 24, so that the notched groove 2221 is formed in the inner magnetic path portion 22, the portion of the inner magnetic path portion 22 with low magnetic permeability is eliminated, the weight of the inner magnetic path portion 22 is reduced, the portion of the inner magnetic path portion 22 with high magnetic permeability can be fully utilized, the good BL value and the linear range of the sound generating device 100 are guaranteed, and the design requirements of miniaturization and light weight can be met.

The sound production device 100 of the invention is provided with the containing cavities 11 with openings at two ends in the basin frame 1, so that the magnetic circuit system 2 and the vibration system 3 are installed, fixed and protected by the basin frame 1, the magnetic circuit system 2 is arranged into the U-shaped iron 21, the inner magnetic circuit part 22 and the outer magnetic circuit part 23, the inner magnetic circuit part 22 is installed and fixed by the containing groove 211 of the U-shaped iron 21, and the outer magnetic circuit part 23 is arranged on the supporting surface 212 of the U-shaped iron 21, so that the magnetic gap 24 for suspending the voice coil 32 of the vibration system 3 is formed by enclosing the side walls of the containing groove 211 of the inner magnetic circuit part 22 and the U-shaped iron 21 and the outer magnetic circuit part 23, and after the voice coil 32 is electrified, the voice coil 32 makes the motion of cutting the magnetic induction line in the magnetic gap 24 of the magnetic circuit system 2, thereby driving the vibration diaphragm 31 to produce sound; by providing the notched groove 2221 on the side of the inner magnetic path portion 22 facing the magnetic gap 24, the portion of the inner magnetic path portion 22 with low magnetic permeability is eliminated to reduce the weight of the inner magnetic path portion 22, and the portion of the inner magnetic path portion 22 with high magnetic permeability is fully utilized to ensure good BL value and linear range of the sound generating apparatus 100, while also meeting the design requirements of miniaturization and light weight.

In one embodiment, the inner magnetic path portion 22 includes an inner magnet 221 and an inner washer 222 stacked together, the inner magnet 221 is sandwiched between the inner washer 222 and the bottom wall of the receiving groove 211, and one side of the inner washer 222 facing the magnetic gap 24 is provided with a notch groove 2221; the outer magnetic circuit part 23 comprises an outer magnet 231 and an outer washer 232 which are arranged in a laminated mode, the outer magnet 231 is clamped between the outer washer 232 and the supporting surface 212, and the outer washer 232 is connected with the basin stand 1.

In the present embodiment, as shown in fig. 1 to 4, the inner magnetic path section 22 includes an inner magnet 221 and an inner washer 222, the inner magnet 221 may be a magnet, and the inner washer 222 may be a magnetic conductive plate structure. The inner magnet 221 has a shape profile identical or identical to the shape profile of the inner washer 222. Alternatively, the inner magnet 221 and the inner washer 222 may be circular, oval, square, or race track type, etc., and are not limited thereto. It will be appreciated that the outer magnetic circuit portion 23 comprises an outer magnet 231 and an outer washer 232, the outer magnet 231 being optionally a magnet and the outer washer 232 being optionally a magnetically permeable plate structure. The outer magnet 231 has a shape profile identical or identical to that of the outer washer 232. Alternatively, the outer magnets 231 and the outer washers 232 may be circular rings, elliptical rings, square rings, racetrack rings, or the like, which is not limited herein.

It can be understood that the inner magnet 221 and the inner washer 222 of the inner magnetic path portion 22 have shape profiles substantially similar to the shape profile of the receiving groove 211 of the U-iron 21, and the outer magnet 231 and the outer washer 232 of the outer magnetic path portion 23 have shape profiles substantially similar to the shape profile of the notch of the receiving groove 211 of the U-iron 21. Optionally, the U-iron 21 is a cylindrical structure with one end open. In this embodiment, the support surface 212 of the U-iron 21 is fixedly bonded to the outer magnet 231 of the outer magnet circuit portion 23, the outer magnet 231 is fixedly bonded to the outer washer 232, and the outer magnet circuit portion 23 is fixedly connected to the basin stand 1 through the outer washer 232.

Optionally, the outer washer 232 and the basin stand 1 may be connected by welding, bonding or integral molding, which is not limited herein. In this embodiment, as shown in fig. 1 to 5, a limiting protrusion 2321 is convexly disposed on a side of the outer washer 232 facing away from the magnetic gap 24, the basin stand 1 is disposed with a limiting groove 12, and the limiting protrusion 2321 is accommodated and limited in the limiting groove 12. It can be understood that, by the arrangement, the connection stability of the basin stand 1 and the outer magnetic circuit part 23 can be improved, and the limit installation of the magnetic circuit system 2 can be realized.

In one embodiment, as shown in fig. 1 to 4, a concave groove 2222 is formed on a side of the inner washer 222 facing away from the inner magnet 221.

In the present embodiment, the notched groove 2221 is provided on one side of the inner washer 222 facing the magnetic gap 24, and the recessed groove 2222 is provided on one side of the inner washer 222 facing away from the inner magnet 221, so that the inner washer 222 forms a stepped structure, and the notched groove 2221 and the recessed groove 2222 are further used to cancel the portion of the inner washer 222 with low magnetic permeability in a matching manner, so as to reduce the weight of the inner washer 222, achieve the purpose of reducing weight, and simultaneously ensure the magnetic permeability and the magnetic field strength of the inner washer 222 under the action of the inner magnet 221.

In this embodiment, the notch groove 2221 may be a notch, a groove, or the like. The recessed groove 2222 may be selected from a groove structure, a through groove structure, and the like, and is not limited herein. The concave groove 2222 is formed by the side of the inner washer 222 facing away from the inner magnet 221 being concave towards the inner magnet 221, and optionally the concave groove 2222 is located in the middle of the inner washer 222.

In order to further increase the magnetic flux density at the magnetic gap 24, the inner wall of the recess 2222 is formed in a curved surface, so that the air flow generated by the vibration of the diaphragm 31 is smoother. In the embodiment, as shown in fig. 6 to 8, the notch groove 2221 and the recessed groove 2222 of the inner washer 222 of the present invention are matched to remove the portion of the inner washer 222 with low magnetic permeability, so that the magnetic flux density of the inner washer 222 can be increased, and thus on the premise of ensuring the magnetic flux, the weight of the inner washer 222 can be effectively reduced, the use efficiency of the inner washer 222 can be improved, the BL curve is more symmetrical, the stress is more balanced in the reciprocating vibration process of the voice coil 32, and the vibration state is more stable.

It can be understood that, in order to ensure that the voice coil 32 of the vibration system 3 can perform the cutting magnetic induction line motion in the magnetic gap 24, the voice coil 32 can keep the maximum displacement of the voice coils with the constant number in the magnetic gap 23, and the voice coil 32 adopts a long voice coil and is matched with the stepped inner washer 222, so that the part of the inner washer 222, which is adjacent to the magnetic gap 24, is stepped, the magnetic flux density at the magnetic gap 24 can be increased, the sound generating device 100 is ensured to have higher sensitivity, and the linear range of the sound generating device 100 is increased under the condition of ensuring the BL value.

Alternatively, the notch groove 2221 extends along the periphery of the inner washer 222, such that the notch groove 2221 extends along the circumferential direction of the magnetic gap 24 to form a ring groove structure located on the outer side wall of the inner washer 222. To further ensure the magnetic flux density of the inner washer 222 at the magnetic gap 24, a notched groove 2221 is provided adjacent to the inner magnet 221.

In the present embodiment, the notch groove 2221 penetrates the bottom surface of the inner washer 222 facing the inner magnet 221, so that the outer sidewall of the inner washer 222 facing the magnetic gap 24 is arranged in a stepped manner. It is understood that the concave groove 2222 may be alternatively a semicircular groove or a hemispherical groove. The connection between the wall of the recessed groove 2222 and the surface of the inner washer 222 facing away from the inner magnet 221 is rounded or in a circular arc shape, so that the flow of the air flow generated by the vibration of the diaphragm 31 is smoother.

Optionally, the inner wall of the concave groove 2222 includes a convex arc surface and a concave arc surface connected, and one side of the convex arc surface, which is far away from the concave arc surface, is connected with the outer side wall of the inner washer 222.

In this embodiment, as shown in fig. 1 to 4, the inner wall of the concave groove 2222 is set to be a convex arc surface and a concave arc surface which are connected, so that the convex arc surface is located at the edge of the concave arc surface and is connected with the outer side wall of the inner washer 222, thereby ensuring that the upper end of the inner washer 222 is in smooth transition arrangement to homogenize the magnetic induction lines and further increase the magnetic flux density at the magnetic gap 24. Optionally, the junction between the convex arc surface and the concave arc surface is in a smooth transition arrangement, that is, the inner wall of the concave groove 2222 is in a smooth arc surface structure, so that the airflow generated by the vibration of the diaphragm 31 flows more smoothly, and the interference caused by the airflow impacting the magnetic circuit system 2 is reduced.

In one embodiment, the thickness of the inner magnet 221 is defined as h1, and the thickness of the outer magnet 231 is defined as h2, wherein 0.8 ≦ h1/h2 ≦ 1.2. It is understood that, as shown in fig. 3 and 4, the thickness h1 of the inner magnet 221 is the thickness of the inner magnet 221 in the moving direction of the voice coil 32 or the vibrating direction of the diaphragm 31, and the thickness h2 of the outer magnet 231 is the thickness of the outer magnet 231 in the moving direction of the voice coil 32 or the vibrating direction of the diaphragm 31.

In the embodiment, the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 is controlled within the range of 0.8 to 1.2, so that the magnetic field distribution of the magnetic circuit system 2 is more uniform, and the magnetic field strength is maximized within a limited space and cost range. Optionally, the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 is 0.8, 0.9, 1, 1.1, 1.2, etc., and is not limited herein.

In one embodiment, the maximum thickness of the inner washer 222 is defined as t1, and the thickness of the outer washer 232 is defined as t2, wherein 2 ≦ t1/t2 ≦ 2.5. It can be understood that, as shown in fig. 3 and 4, the maximum thickness t1 of the inner washer 222 is the maximum distance between the side of the inner washer 222 facing away from the inner magnet 221 and the side of the inner washer 222 facing toward the inner magnet 221, the thickness of the inner washer 222 is the thickness of the inner washer 222 in the moving direction of the voice coil 32 or the vibrating direction of the diaphragm 31, and the thickness t2 of the outer washer 232 is the thickness of the outer washer 232 in the moving direction of the voice coil 32 or the vibrating direction of the diaphragm 31.

In the embodiment, the ratio of the maximum thickness t1 of the inner washer 222 to the thickness t2 of the outer washer 232 is controlled within the range of 2-2.5, so that the magnetic field distribution of the magnetic circuit system 2 is more uniform, and the magnetic field strength is maximized within the limited space and cost range. Optionally, the ratio of the maximum thickness t1 of the inner washer 222 to the thickness t2 of the outer washer 232 is 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc., and is not limited herein.

In one embodiment, as shown in FIGS. 3 and 4, the radius of the inner washer 222 is defined as d1, and the width of the outer washer 232 is defined as d2, wherein 1.5 ≦ d1/d2 ≦ 2. It will be appreciated that the inner washer 222 may be of circular disc configuration, the radius d1 of the inner washer 222 being the radius of the surface of the side of the inner washer 222 facing away from the inner magnet 221, and the outer washer 232 may be of circular ring configuration.

In the embodiment, the ratio of the radius d1 of the inner washer 222 to the width d2 of the outer washer 232 is controlled within the range of 1.5-2, so that the magnetic field distribution of the magnetic circuit system 2 is more uniform, and the magnetic field intensity is maximized within a limited space and cost range. Optionally, the ratio of the radius d1 of the inner washer 222 to the width d2 of the outer washer 232 is 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., and is not limited herein.

In one embodiment, as shown in fig. 1 to 4, the cross-section of the concave groove 2222 is semicircular, the radius of the concave groove 2222 is defined as R, the maximum thickness of the inner washer 222 is defined as t1, and the radius of the inner washer 222 is defined as d1, wherein t1 < R < d 1.

In the present embodiment, the inner washer 222 is cut from the middle of the inner washer 222 in the moving direction of the voice coil 32 or the vibration direction of the diaphragm 31, the cross section of the concave groove 2222 is semicircular, and the length of the inner washer 222 adjacent to the outer side wall of the magnetic gap 24 is ensured by defining the radius R of the concave groove 2222 between the maximum thickness t1 of the inner washer 222 and the radius d1 of the inner washer 222, so as to ensure the magnetic flux density of the inner washer 222 at the magnetic gap 24.

In an embodiment, the inner magnetic path portion 22 further includes a short circuit ring 223, the short circuit ring 223 includes a first section 2231 and a second section 2232 arranged at an included angle, the first section 2231 is connected to a side of the inner washer 222 facing away from the inner magnet 221, and the second section 2232 is attached to a side of the inner washer 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch groove 2221.

In the present embodiment, as shown in fig. 1 to fig. 4, by providing the shorting ring 223, the back electromotive force of the voice coil 32 in the magnetic gap 24 is effectively reduced by the shorting ring 223, so as to reduce the inductance and improve the high frequency sensitivity. Optionally, the shorting ring 223 is made of copper.

It will be appreciated that the shorting ring 223 is an annular cylindrical structure. As shown in fig. 1-4, the shorting ring 223 includes a first section 2231 and a second section 2232 disposed at an included angle, optionally, the first section 2231 and the second section 2232 are disposed vertically. The first section 2231 is connected to a side of the inner washer 222 facing away from the inner magnet 221, and the first section 2231 is provided with an opening corresponding to the concave groove 2222, i.e., the concave groove 2222 is exposed to the opening. The second section 2232 is attached to the side of the inner washer 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the cutaway slot 2221.

In one embodiment, as shown in fig. 4, the length of the notch groove 2221 in the axial direction of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 in the direction perpendicular to the axial direction of the magnetic gap 24 is defined as b; wherein a/b is more than or equal to 1.8 and less than or equal to 2.2.

In the present embodiment, the axial direction of the magnetic gap 24 is the moving direction of the voice coil 32, and the axial direction perpendicular to the magnetic gap 24 is the direction from the inner magnetic path portion 22 to the side wall of the receiving groove 211 of the U-iron 21. By providing the notched groove 2221 on the side of the inner magnetic path portion 22 facing the magnetic gap 24, defining the length of the notched groove 2221 along the axial direction of the magnetic gap 24 as a, and defining the length of the notched groove 2221 along the direction perpendicular to the axial direction of the magnetic gap 24 as b, the ratio of the length a of the notched groove 2221 along the axial direction of the magnetic gap 24 to the length b of the notched groove 2221 along the direction perpendicular to the axial direction of the magnetic gap 24 is in the range of 1.8 to 2.2, so that the notched groove 2221 is provided on the inner magnetic path portion 22 to eliminate the portion of the inner magnetic path portion 22 with low magnetic permeability, thereby reducing the weight of the inner magnetic path portion 22, and thus, the portion of the inner magnetic path portion 22 with high magnetic permeability can be fully utilized to ensure good BL value and linear range of the device 100, and meet the design requirements of miniaturization and light weight.

Alternatively, the ratio of the length a of the cutaway groove 2221 in the axial direction of the magnetic gap 24 to the length b of the cutaway groove 2221 in the direction perpendicular to the axial direction of the magnetic gap 24 is 1.8, 1.9, 2, 2.1, 2.2, etc., and is not limited herein.

In one embodiment, the bottom wall of the receiving slot 211 is provided with a convex boss 213, the convex boss 213 is spaced apart from the side wall of the receiving slot 211, and encloses to form an avoiding slot 214 communicated with the receiving slot 211, the avoiding slot 214 corresponds to the magnetic gap 24, and the inner magnetic path portion 22 is supported on the convex boss 213.

In the present embodiment, as shown in fig. 1 to 5, the boss 213 is disposed on the bottom wall of the receiving groove 211 of the U-iron 21, so that the boss 213 is spaced from the side wall of the receiving groove 211 to form the avoiding groove 214, and the avoiding groove 214 is correspondingly communicated with the magnetic gap 24, so that the movement of the voice coil 32 in the magnetic gap 24 is avoided by the avoiding groove 214 while the fixed inner magnetic path portion 22 is supported by the boss 213, so as to ensure the amplitude of the sound generating device 100.

It is understood that the protrusion 213 may be a protrusion protruding from the bottom wall of the receiving groove 211. Of course, the boss 213 may be formed by a protrusion of the U-iron 21 from a side opposite to the bottom wall of the receiving groove 211 toward the receiving groove 211, which is not limited herein. Optionally, a groove 215 is concavely formed on a side of the U-iron 21 facing away from the notch of the receiving groove 211, that is, the groove 215 is concavely formed on a side of the U-iron 21 facing away from the bottom wall of the receiving groove 211 corresponding to the boss 213.

In the present embodiment, in order to ensure the air pressure balance in the vibration space when the voice coil 32 vibrates the diaphragm 31, a through hole is provided in the frame 1, and the through hole communicates with the vibration space. Of course, the inner magnetic path portion 22 may be provided with a through hole structure corresponding to the through hole. Optionally, the through hole is opened in the bottom wall of the cavity 11 of the basin stand 1 and penetrates through the bottom wall of the cavity 11.

In an embodiment, as shown in fig. 1, the vibration system 3 further includes a centering ring 33, an inner side of the centering ring 33 is connected to an outer wall of the voice coil 32, the fixing table 13 is protruded from the frame 1, and an outer side of the centering ring 33 is connected to the fixing table 13. It can be understood that, by providing the centering ring 33, the limitation that the voice coil 32 is polarized or sways left and right during the vibration process is effectively avoided by the centering ring 33, so as to improve the vibration sound production effect of the diaphragm 31.

It can be understood that the fixing platform 13 may be a boss structure formed by protruding the inner wall of the cavity 11, or may be a step structure formed by the inner wall of the cavity 11, which is not limited herein.

In one embodiment, as shown in fig. 1 to 5, the U-iron 21 extends adjacent to the supporting surface 212 toward a side away from the receiving groove 211 to form a supporting platform 216, the supporting platform 216 is flush with the supporting surface 212, and the outer magnetic circuit portion 23 is supported on the supporting surface 212 and the supporting platform 216. It will be appreciated that the connection stability of the outer magnetic circuit portion 23 and the U-shaped iron 21 is improved by providing the support stage 216 so as to increase the contact area with the outer magnetic circuit portion 23 by the support stage 216 and the support surface 212.

The invention further provides a terminal device, which comprises a device shell and the sound generating device 100, wherein the sound generating device 100 is arranged in the device shell. The specific structure of the sound generating device 100 refers to the foregoing embodiments, and since the terminal device adopts all the technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are achieved, and no further description is given here.

The above description is only an alternative 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. A sound generating device, the sound generating device comprising:

the basin stand is provided with a containing cavity with two open ends;

the magnetic circuit system comprises a U-shaped iron, an inner magnetic circuit part and an outer magnetic circuit part, wherein the U-shaped iron is provided with an accommodating groove, the inner magnetic circuit part is arranged in the accommodating groove, the end face of the U-shaped iron, which is adjacent to the notch of the accommodating groove, forms a supporting surface, the outer magnetic circuit part is arranged on the supporting surface and is connected with the basin frame, the outer magnetic circuit part is matched with the U-shaped iron to cover an opening at one end of the accommodating groove, the side wall of the accommodating groove and the outer magnetic circuit part are separated from the inner magnetic circuit part to form a magnetic gap, and one side of the inner magnetic circuit part, which faces the magnetic gap, is provided with a notch groove; and

2. The sound production device according to claim 1, wherein the inner magnetic path portion comprises an inner magnet and an inner washer which are stacked, the inner magnet is clamped between the inner washer and the bottom wall of the containing groove, and the notched groove is formed in one side of the inner washer facing the magnetic gap;

the outer magnet circuit part comprises an outer magnet and an outer washer which are arranged in a stacked mode, the outer magnet is clamped between the outer washer and the supporting surface, and the outer washer is connected with the basin stand.

3. The sound production device as claimed in claim 2, wherein a concave groove is formed in a side of the inner washer facing away from the inner magnet.

4. The sound production device according to claim 3, wherein the thickness of the inner magnet is defined as h1, the thickness of the outer magnet is defined as h2, wherein 0.8 ≦ h1/h2 ≦ 1.2;

5. The sound generator of claim 3, wherein the notched groove extends along a periphery of the inner washer;

and/or the notch groove is arranged adjacent to the inner magnet;

and/or, one side of the outer washer back to the magnetic gap is convexly provided with a limiting bulge, the basin frame is provided with a limiting groove, and the limiting bulge is accommodated and limited in the limiting groove.

6. The sound generating device according to claim 2, wherein the inner magnetic circuit further comprises a short circuit ring, the short circuit ring comprises a first section and a second section which are arranged at an included angle, the first section is connected with one side of the inner washer, which faces away from the inner magnet, the second section is attached to one side of the inner washer, which faces the magnetic gap, and extends to the inner magnet to cover the notch groove.

7. The sound generating apparatus according to any one of claims 1 to 6, wherein a length of the cutaway groove in the magnetic gap axis direction is defined as a, and a length of the cutaway groove in a direction perpendicular to the magnetic gap axis direction is defined as b; wherein, a/b is more than or equal to 1.8 and less than or equal to 2.2.

8. The sounding device according to any one of claims 1 to 6, wherein a boss is convexly provided on a bottom wall of the receiving groove, the boss is spaced from a side wall of the receiving groove and encloses a receiving groove communicating with the receiving groove, the receiving groove corresponds to the magnetic gap, and the inner magnetic path portion is supported by the boss;

9. The sounding device according to any one of claims 1 to 6, wherein the vibration system further comprises a centering ring, an inner side of the centering ring is connected with an outer wall of the voice coil, the frame is convexly provided with a fixed platform, and an outer side of the centering ring is connected with the fixed platform;

10. A terminal device, comprising a device housing and a sound generating device according to any one of claims 1 to 9, said sound generating device being provided in said device housing.