CN115103279B - Sound production device and terminal equipment - Google Patents

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

Background

A loudspeaker, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy by some physical effect. When different electronic energy is transmitted to the voice coil of the loudspeaker, the voice coil generates energy to interact with the magnetic field of the magnet, the interaction causes vibration of the vibrating diaphragm, and the voice coil of the loudspeaker moves forwards or backwards due to the fact that the electronic energy changes at any time, so that the vibrating diaphragm of the loudspeaker moves along with the movement, and the action changes the density degree of air to generate sound.

In the related art, most of the washer of the loudspeaker is cylindrical or circular, and is adhered to the magnet through glue to form a magnetic circuit system of the loudspeaker together with U-shaped iron or T-shaped iron. The washer has a magnetic conduction function, and forms a magnetic circuit with the U-shaped iron or the T-shaped iron and the magnet, so that the electrified voice coil makes cutting magnetic induction line motion therein to drive the vibrating diaphragm to vibrate and sound. However, the magnetic permeability of the disc-shaped or circular washer-shaped partial area is very low, the area with low reserved magnetic permeability causes the weight increase of the washer, the design requirements of miniaturization and light weight cannot be met, and the BL value and the linear range are poor.

Disclosure of Invention

The invention mainly aims to provide a sound generating device and terminal equipment, and aims to provide the sound generating device which ensures that BL values and linear ranges are good.

To achieve the above object, the present invention provides a sound emitting 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 a containing groove, the inner magnetic circuit part is arranged in the containing groove, the U-shaped iron is adjacent to the end face of a notch of the containing groove to form 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 and the U-shaped iron are matched to cover an opening at one end of the containing cavity, the side wall of the containing groove, the outer magnetic circuit part and the inner magnetic circuit part are separated to form a magnetic gap, one side of the inner magnetic circuit part facing the magnetic gap is provided with a notch groove, 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 containing cavity, and one end, away from the vibrating diaphragm, of the voice coil is suspended in the magnetic gap.

In one embodiment, the inner magnetic circuit part comprises an inner magnet and an inner washer which are arranged in a stacked manner, the inner magnet is clamped between the inner washer and the bottom wall of the accommodating groove, and the notch groove is arranged on one side of the inner washer facing the magnetic gap;

The outer magnetic 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 of the inner washer, which faces away from the inner magnet.

In one embodiment, the thickness of the inner magnet is defined as h1, and 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 defining the thickness t2 of the outer washer, wherein t1/t2 is more than or equal to 2 and less than or equal to 2.5;

And/or defining the radius of the inner washer as d1 and the width of the outer washer 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 internal washer is defined as t1, and the radius of the internal washer is defined as d1, wherein t1< R < d1.

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 away from the magnetic gap, is convexly provided with a limiting protrusion, the basin frame is provided with a limiting groove, and the limiting protrusion is accommodated in and limited in the limiting groove.

In an embodiment, the inner magnetic circuit portion further includes a short circuit ring, the short circuit ring includes a first section and a second section disposed at an included angle, the first section is connected with a side of the inner washer facing away from the inner magnet, and the second section is attached to a side of the inner washer facing the magnetic gap and extends to the inner magnet to cover the notch groove.

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

In an 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 a clearance groove communicated with the accommodating groove, the clearance 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 away from 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 basin frame is convexly provided with a fixing table, and the outer side of the centering ring is connected with the fixing table;

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

The invention also provides a terminal device which comprises a device shell and the sounding device, wherein the sounding device is arranged on the device shell.

According to the sound production device, through the arrangement of the accommodating cavities with the openings at the two ends in the basin frame, 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 inner magnetic circuit part is installed and fixed by the accommodating groove of the U-shaped iron, the outer magnetic circuit part is arranged on the supporting surface of the U-shaped iron, the side wall of the accommodating groove of the inner magnetic circuit part and the outer magnetic circuit part are enclosed to form a magnetic gap for the voice coil of the vibration system to suspend, after the voice coil is electrified, the voice coil makes a motion of cutting a magnetic induction wire in the magnetic gap of the magnetic circuit system, so that the vibrating diaphragm is driven to vibrate and sound, and a part with low magnetic permeability of the inner magnetic circuit part is canceled, so that 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, and the good BL value and linear range of the sound production device are ensured, and the design requirements of miniaturization and light weight are met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a sound generating apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic 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 schematic view of a part of a magnetic circuit system according to an embodiment of the present invention;

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

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

FIG. 7 is a schematic diagram of a simulated induction line of a portion of a magnetic circuit system according to the prior art;

Fig. 8 is a BL graph of a sound emitting device according to an embodiment of the present invention and the prior art.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	Sounding device	222	Chinese style food
1	Basin stand	2221	Notch groove
				11	Containing cavity	2222	Concave groove
12	Limiting groove	223	Short circuit ring
				13	Fixed table	2231	First section
2	Magnetic circuit system	2232	Second section
				21	U iron	23	External magnetic circuit part
211	Accommodating groove	231	External magnet
				212	Supporting surface	232	External washer
213	Boss	2321	Spacing bump
				214	Position avoiding groove	24	Magnetic gap
215	Groove	3	Vibration system
				216	Supporting table	31	Vibrating diaphragm
22	Inner magnetic circuit part	32	Voice coil
				221	Inner magnet	33	Centering ring

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

A loudspeaker, also called a loudspeaker, is an electroacoustic transducer that converts electrical energy into acoustic energy by some physical effect. When different electronic energy is transmitted to the voice coil of the loudspeaker, the voice coil generates energy to interact with the magnetic field of the magnet, the interaction causes vibration of the vibrating diaphragm, and the voice coil of the loudspeaker moves forwards or backwards due to the fact that the electronic energy changes at any time, so that the vibrating diaphragm of the loudspeaker moves along with the movement, and the action changes the density degree of air to generate sound.

In the related art, most of the washer of the loudspeaker is cylindrical or circular, and is adhered to the magnet through glue to form a magnetic circuit system of the loudspeaker together with U-shaped iron or T-shaped iron. The washer has a magnetic conduction function, and forms a magnetic circuit with the U-shaped iron or the T-shaped iron and the magnet, so that the electrified voice coil makes cutting magnetic induction line motion therein to drive the vibrating diaphragm to vibrate and sound. However, the magnetic permeability of the disc-shaped or circular washer-shaped partial area is very low, the area with low reserved magnetic permeability causes the weight increase of the washer, the design requirements of miniaturization and light weight cannot be met, and the BL value and the linear range are poor.

Based on the above concepts and problems, the present invention proposes a sound generating apparatus 100. It will be appreciated that the sound generating apparatus 100 is applied to a terminal device, which may be a sound box, a vehicle-mounted sound box, etc., and is not limited herein.

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

In this embodiment, the basin stand 1 is used for installing, fixing, supporting and protecting the components of the vibration system 3, the magnetic circuit system 2, etc., that is, the basin stand 1 provides an installation base for the components of the vibration system 3, the magnetic circuit system 2, etc. It should be understood that the frame 1 may be a structure such as a mounting shell, a housing or a box with a cavity 11, that is, the frame 1 defines a receiving space, which is not limited herein.

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

In this embodiment, the magnetic circuit 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-shaped manner, at this time, the U-shaped iron 21 has a receiving groove 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 groove 211 of the U-shaped iron 21 is communicated with the receiving cavity 11, a notch of the receiving groove 211 is opposite to the diaphragm 31, a supporting surface 212 is formed by an end surface of the U-shaped iron 21 adjacent to the notch of the receiving groove 211, the outer magnetic circuit portion 23 is disposed on the supporting surface 212 and is connected with the frame 1, the inner magnetic circuit portion 22 is disposed in the receiving groove 211, such that a side wall of the receiving groove 211 and the outer magnetic circuit portion 23 are spaced apart from the inner magnetic circuit portion 22 to form a magnetic gap 24, and a voice coil 32 of the vibration system 3 is disposed in a vibration space of the sound generating device 100, such that one end of the voice coil 32 is connected with the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24, when the voice coil 32 is energized, the voice coil 32 introduces electric energy into the magnetic gap 24 of the magnetic circuit 2, and drives the voice coil 32 to perform a linear motion under the magnetic field action of the magnetic circuit 2, such that the voice coil 32 cuts the magnetic coil, so as to convert the electric energy into the mechanical energy, and the vibration energy, so as to convert the vibration energy, and vibration energy, so that vibration energy, so can realize vibration energy, and vibration energy.

It can be understood that when the basin frame 1 is a metal piece, the magnetic circuit system 2 and the basin 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 basin frame 1 is formed by injection molding, the magnetic conductive plate of the outer magnetic circuit portion 23 of the magnetic circuit system 2 may be injection molded in the basin frame 1 as an insert, or the magnetic circuit system 2 and the basin frame 1 may be fixed by bonding, and then other parts are fixed by bonding, which is not limited herein.

In this embodiment, the inner magnetic circuit portion 22 is disposed in the accommodating groove 211, which can reduce the longitudinal space of the sound generating device 100, reduce the product height, be used in a narrower space, and achieve miniaturization of the product, while the structure avoids the interference of the diaphragm 31 with the magnetic circuit system 2 during large-amplitude operation compared with the conventional design. At the same time, the outer magnetic circuit portion 23 is provided on the support surface 212 formed on the end surface of the U-iron 21 adjacent to the notch of the accommodating groove 211, thereby further increasing the magnetic field strength.

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

According to the sound production device 100, the basin frame 1 is provided with the containing cavities 11 with two open ends, so that the basin frame 1 is used for installing, fixing and protecting the magnetic circuit system 2 and the vibration system 3, the magnetic circuit system 2 is provided with the U-shaped iron 21, the inner magnetic circuit part 22 and the outer magnetic circuit part 23, the containing grooves 211 of the U-shaped iron 21 are used for installing and fixing the inner magnetic circuit part 22, the outer magnetic circuit part 23 is arranged on the supporting surface 212 of the U-shaped iron 21, the inner magnetic circuit part 22 and the side walls of the containing grooves 211 of the U-shaped iron 21 and the outer magnetic circuit part 23 are enclosed to form the magnetic gap 24 for the voice coil 32 of the vibration system 3 to suspend, after the voice coil 32 is electrified, the voice coil 32 makes a motion of cutting a magnetic induction line in the magnetic gap 24 of the magnetic circuit system 2, so that the vibration film 31 is driven to vibrate and produce sound, and the part with low magnetic permeability of the inner magnetic circuit part 22 is cancelled by arranging the notch 2221 on one side of the inner magnetic circuit part 22 facing the magnetic gap 24, so that the weight of the inner magnetic circuit part 22 is reduced, and the part with high magnetic permeability of the inner magnetic circuit part 22 is fully utilized, so that the good BL value and the linear range of the sound production device 100 can be ensured, and the requirements of miniaturization and design can be satisfied.

In one embodiment, the inner magnetic circuit part 22 comprises an inner magnet 221 and an inner washer 222 which are stacked, the inner magnet 221 is clamped between the inner washer 222 and the bottom wall of the accommodating groove 211, a notch groove 2221 is arranged on one side of the inner washer 222 facing the magnetic gap 24, the outer magnetic circuit part 23 comprises an outer magnet 231 and an outer washer 232 which are stacked, 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 frame 1.

In the present embodiment, as shown in fig. 1 to 4, the inner magnetic circuit portion 22 includes an inner magnet 221 and an inner washer 222, the inner magnet 221 being selected as a magnet, and the inner washer 222 being selected as a magnetically conductive plate structure. The shape contour of the inner magnet 221 is identical to or identical to the shape contour of the inner washer 222. Alternatively, the inner magnet 221 and the inner washer 222 may be circular, elliptical, square, racetrack, or the like, without limitation. It will be appreciated that the outer magnetic circuit portion 23 includes 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 shape profile of the outer magnet 231 is identical or identical to the shape profile of the outer washer 232. Alternatively, the outer magnet 231 and the outer washer 232 may be circular rings, elliptical rings, square rings, racetrack rings, or the like, without limitation.

It will be appreciated that the shape profile of the inner magnet 221 and the inner washer 222 of the inner magnetic circuit portion 22 is substantially similar to the shape profile of the receiving groove 211 of the U-iron 21, and the shape profile of the outer magnet 231 and the outer washer 232 of the outer magnetic circuit portion 23 is substantially similar to the shape profile of the notch of the receiving groove 211 of the U-iron 21. Alternatively, the U-iron 21 is a cylindrical structure with one end open. In this embodiment, the supporting surface 212 of the U-shaped iron 21 is bonded and fixed to the outer magnet 231 of the outer magnetic circuit portion 23, the outer magnet 231 is bonded and fixed to the outer washer 232, and the outer magnetic circuit portion 23 is connected and fixed to the basin frame 1 through the outer washer 232.

Alternatively, the outer washer 232 may be connected to the tub 1 by welding, bonding, or integrally molding, which is not limited herein. In this embodiment, as shown in fig. 1 to 5, a limiting protrusion 2321 is protruding from a side of the outer washer 232 facing away from the magnetic gap 24, and the basin stand 1 is provided with a limiting groove 12, where the limiting protrusion 2321 is accommodated and limited in the limiting groove 12. It can be appreciated that by the arrangement, the connection stability of the basin frame 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, the inner washer 222 is provided with a recess 2222 on a side facing away from the inner magnet 221.

In this embodiment, the notch groove 2221 is formed on the side of the inner washer 222 facing the magnetic gap 24, and the recess groove 2222 is formed on the 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 notch groove 2221 and the recess groove 2222 are further matched to cancel the portion of the inner washer 222 with low magnetic permeability, so as to reduce the weight of the inner washer 222, achieve the weight reduction purpose, and 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 2221 may be a notch, a groove, or the like. The recess 2222 may be selected from a groove structure, a through groove structure, and the like, which are not limited herein. The recess 2222 is formed by recess of the side of the inner washer 222 facing away from the inner magnet 221 toward the inner magnet 221, and alternatively, the recess 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 provided in an arc surface, so that the airflow generated by the vibration of the diaphragm 31 flows more smoothly. In this embodiment, as shown in fig. 6 to 8, the notch groove 2221 and the recess groove 2222 of the internal washer 222 of the present invention cooperate to remove the portion with low magnetic permeability on the internal washer 222, so that the magnetic flux density of the internal washer 222 can be increased, and thus, on the premise of ensuring the magnetic flux, the weight of the internal washer 222 can be effectively reduced, the service efficiency of the internal 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 will be appreciated that in order to ensure that the voice coil 32 of the vibration system 3 can maintain a constant number of maximum displacements of the voice coil within the magnetic gap 23 when performing the cutting induction line motion within the magnetic gap 24, the voice coil 32 is a long voice coil and is matched with the stepped inner washer 222, so that the inner washer 222 is stepped adjacent to the magnetic gap 24, the magnetic flux density at the magnetic gap 24 can be increased, the higher sensitivity of the sound generating device 100 is ensured, 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, the notch groove 2221 is provided adjacent to the inner magnet 221.

In the present embodiment, the notch 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 stepwise manner. It is understood that the concave groove 2222 may alternatively be a semicircular groove or a hemispherical groove. The connection between the groove wall of the recess 2222 and the surface of the side of the inner washer 222 facing away from the inner magnet 221 is rounded or arc-shaped, so that the airflow generated by vibration of the diaphragm 31 can flow more smoothly.

Optionally, the inner wall of the concave groove 2222 includes a convex arc surface and a concave arc surface that are connected, and a side of the convex arc surface 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, by setting the inner wall of the concave groove 2222 as a convex arc surface and a concave arc surface that are connected, 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, so that the upper end of the inner washer 222 is ensured to be in a smooth transition arrangement, so as to homogenize the magnetic induction line and further increase the magnetic flux density at the magnetic gap 24. Optionally, the connection 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 airflow generated by vibration of the diaphragm 31 flows more smoothly, and interference caused by 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 will be 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 along 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 along the moving direction of the voice coil 32 or the vibrating direction of the diaphragm 31.

In this embodiment, the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 is controlled within a range of 0.8-1.2, 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. Alternatively, 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., which 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 will 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 the inner magnet 221, the thickness of the inner washer 222 is the thickness of the inner washer 222 along the moving direction of the voice coil 32 or the vibrating direction of the vibrating diaphragm 31, and the thickness t2 of the outer washer 232 is the thickness of the outer washer 232 along the moving direction of the voice coil 32 or the vibrating direction of the vibrating diaphragm 31.

In this 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 a range of 2-2.5, 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 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., without limitation.

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, where 1.5≤d1/d2≤2. It will be appreciated that the inner washer 222 may be selected to have a disk structure, the radius d1 of the inner washer 222 is the radius of the side surface of the inner washer 222 facing away from the inner magnet 221, and the outer washer 232 may be selected to have a ring structure.

In this embodiment, the ratio of the radius d1 of the inner washer 222 to the width d2 of the outer washer 232 is controlled within a 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., without limitation.

In one embodiment, as shown in fig. 1 to 4, the cross section of the recess 2222 is semicircular, defining a radius R of the recess 2222, defining a maximum thickness t1 of the internal washer 222, and defining a radius d1 of the internal washer 222, wherein t1< R < d1.

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 vibrating direction of the diaphragm 31, and the cross section of the recess groove 2222 is semicircular, so that the length of the inner washer 222 on the outer side wall adjacent to the magnetic gap 24 is ensured by defining the radius R of the recess 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 circuit portion 22 further includes a shorting ring 223, and the shorting ring 223 includes a first segment 2231 and a second segment 2232 disposed at an angle, the first segment 2231 is connected to a side of the inner washer 222 facing away from the inner magnet 221, and the second segment 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 4, by providing the shorting ring 223, the opposing electromotive force of the voice coil 32 in the magnetic gap 24 is effectively reduced by using the shorting ring 223, so as to reduce the inductance and improve the high frequency sensitivity. Alternatively, the shorting ring 223 is made of copper.

It will be appreciated that the shorting ring 223 is of annular cylindrical configuration. As shown in fig. 1 to 4, the short ring 223 includes a first section 2231 and a second section 2232 disposed at an included angle, and optionally, the first section 2231 and the second section 2232 are disposed vertically. The first segment 2231 is connected to a side of the inner washer 222 facing away from the inner magnet 221, and the first segment 2231 has an opening corresponding to the recess 2222, i.e., the recess 2222 is exposed at the opening. The second segment 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 notch groove 2221.

In one embodiment, as shown in FIG. 4, the length of the notch groove 2221 along the axial direction of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the axial direction perpendicular to the magnetic gap 24 is defined as b, wherein 1.8≤a/b≤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 circuit portion 22 to the side wall of the accommodation groove 211 of the U-iron 21. By arranging the notch groove 2221 on the side of the inner magnetic circuit portion 22 facing the magnetic gap 24, defining the length of the notch groove 2221 along the axial direction of the magnetic gap 24 as a, and defining the length of the notch groove 2221 along the axial direction perpendicular to the magnetic gap 24 as b, the ratio of the length a of the notch groove 2221 along the axial direction of the magnetic gap 24 to the length b of the notch groove 2221 along the axial direction perpendicular to the magnetic gap 24 is in the range of 1.8-2.2, and by arranging the notch groove 2221 on the inner magnetic circuit portion 22, the part with low magnetic permeability on the inner magnetic circuit portion 22 is eliminated, so that the weight of the inner magnetic circuit portion 22 is reduced, the part with high magnetic permeability of the inner magnetic circuit portion 22 can be fully utilized, and the design requirements of miniaturization and light weight can be satisfied while the good BL value and the linear range of the sound generating device 100 are ensured.

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

In an embodiment, the bottom wall of the accommodating groove 211 is convexly provided with a boss 213, the boss 213 is spaced from the side wall of the accommodating groove 211, and encloses a clearance groove 214 communicated with the accommodating groove 211, the clearance groove 214 corresponds to the magnetic gap 24, and the inner magnetic circuit portion 22 is supported on the boss 213.

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

It is understood that the boss 213 may be a protruding structure protruding from the bottom wall of the accommodating groove 211. Of course, the boss 213 may be formed by protruding from a side of the U-shaped iron 21 facing away from the bottom wall of the accommodating groove 211 toward the accommodating groove 211, which is not limited herein. Optionally, a groove 215 is concavely formed on a side of the U-shaped iron 21 facing away from the notch of the accommodating groove 211, that is, a side of the U-shaped iron 21 facing away from the bottom wall of the accommodating groove 211 is concavely formed with the groove 215 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, the through hole communicating with the vibration space. Of course, a through-hole structure may be provided in the inner magnetic circuit portion 22 corresponding to the through-hole. Optionally, the through hole is formed in the bottom wall of the accommodating cavity 11 of the basin stand 1, and penetrates through the bottom wall of the accommodating cavity 11.

In an embodiment, as shown in fig. 1, the vibration system 3 further includes a centering ring 33, the inner side of the centering ring 33 is connected with the outer wall of the voice coil 32, the basin frame 1 is convexly provided with a fixing table 13, and the outer side of the centering ring 33 is connected with the fixing table 13. It can be appreciated that the centering ring 33 is provided, so that the centering ring 33 is utilized to effectively avoid the limitation of polarization or left-right swing and the like of the voice coil 32 in the vibration process, so as to improve the vibration sounding effect of the diaphragm 31.

It can be understood that the fixing table 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-shaped iron 21 extends adjacent to the support surface 212 toward a side facing away from the accommodating groove 211 to form a support stand 216, the support stand 216 is flush with the support surface 212, and the outer magnetic circuit portion 23 is supported on the support surface 212 and the support stand 216. It will be appreciated that by providing the support table 216, the contact area with the outer magnetic circuit portion 23 is increased by the support table 216 and the support surface 212, so that the connection stability of the outer magnetic circuit portion 23 and the U-iron 21 is improved.

The invention also provides a terminal device, which comprises a device shell and the sounding device 100, wherein the sounding device 100 is arranged on the device shell. The specific structure of the sound generating apparatus 100 refers to the foregoing embodiments, and since the present terminal device adopts all the technical solutions of all the foregoing embodiments, at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which are not described in detail herein.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims (9)

1. A sound emitting device, the sound emitting 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 a containing groove, the inner magnetic circuit part is arranged in the containing groove, the U-shaped iron is adjacent to the end face of a notch of the containing groove to form 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 and the U-shaped iron are matched to cover an opening at one end of the containing cavity, the side wall of the containing groove and the outer magnetic circuit part are spaced from the inner magnetic circuit part to form a magnetic gap, the inner magnetic circuit part comprises an inner magnet and an inner washer which are arranged in a stacked mode, the inner magnet is clamped between the inner washer and the bottom wall of the containing groove, one side of the inner washer facing the magnetic gap is provided with a notch groove, the notch groove penetrates through the bottom surface of the inner washer facing away from the inner magnet, one side of the inner washer is provided with a concave groove, the concave groove and the notch groove is a part with low magnetic permeability, and the magnetic gap is formed between the concave groove and the concave groove

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 containing cavity, and one end, away from the vibrating diaphragm, of the voice coil is suspended in the magnetic gap.

2. The sound generating apparatus according to claim 1, wherein the outer magnetic circuit portion includes an outer magnet and an outer washer which are stacked, the outer magnet being interposed between the outer washer and the support surface, the outer washer being connected to the basin frame.

3. The sound generating apparatus according to claim 2, wherein a thickness of the inner magnet is defined as h1 and a 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 defining the thickness t2 of the outer washer, wherein t1/t2 is more than or equal to 2 and less than or equal to 2.5;

And/or defining the radius of the inner washer as d1 and the width of the outer washer 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 internal washer is defined as t1, and the radius of the internal washer is defined as d1, wherein t1< R < d1.

4. The sound emitting apparatus of claim 2, wherein the notch 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, which is away from the magnetic gap, is convexly provided with a limiting protrusion, the basin frame is provided with a limiting groove, and the limiting protrusion is accommodated in and limited in the limiting groove.

5. The sound generating apparatus of claim 1, wherein the inner magnetic circuit portion further comprises a shorting ring comprising a first segment and a second segment disposed at an angle, the first segment being connected to a side of the inner washer facing away from the inner magnet, the second segment being attached to a side of the inner washer facing the magnetic gap and extending to the inner magnet to cover the notch groove.

6. The sound generating apparatus according to any one of claims 1 to 5, wherein a length of the notch groove in the direction of the magnetic gap axis is defined as a, and a length of the notch groove in the direction perpendicular to the magnetic gap axis is defined as b, wherein 1.8≤a/b≤2.2.

7. The sound generating apparatus according to any one of claims 1 to 5, wherein a bottom wall of the accommodating groove is convexly provided with a boss which is spaced from a side wall of the accommodating groove and encloses a space-avoiding groove which communicates with the accommodating groove, the space-avoiding groove corresponding to the magnetic gap, and the inner magnetic circuit portion is supported by the boss;

And/or a groove is concavely arranged on one side of the U-shaped iron, which is away from the notch of the accommodating groove.

8. The sound generating apparatus according to any one of claims 1 to 5, wherein the vibration system further comprises a centering ring, an inner side of the centering ring is connected to an outer wall of the voice coil, the frame is convexly provided with a fixing table, and an outer side of the centering ring is connected to the fixing table;

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

9. A terminal device comprising a device housing and a sound emitting apparatus according to any one of claims 1 to 8, wherein the sound emitting apparatus is provided in the device housing.