CN111818431B - Loudspeaker and manufacturing method thereof - Google Patents

Abstract

The invention discloses a loudspeaker and a manufacturing method thereof, wherein the loudspeaker comprises a shell, and a vibration system and a magnetic circuit system which are arranged in the shell, and the loudspeaker is characterized in that the vibration system comprises a vibrating diaphragm and a voice coil for driving the vibrating diaphragm to vibrate, the magnetic circuit system comprises a magnet, the shell comprises a magnetic conduction shell and a non-magnetic conduction shell edge, the magnet is arranged on the magnetic conduction shell and forms a magnetic gap with the magnetic conduction shell, the voice coil is suspended in the magnetic gap, and the non-magnetic conduction shell edge is connected with one end of the magnetic conduction shell, which is far away from the magnetic. The manufacturing method of the loudspeaker comprises the following steps: injecting magnetic conduction feed and non-magnetic conduction feed into the injection molding machine, and correspondingly forming a magnetic conduction shell green body and a non-magnetic conduction shell green body; sintering the magnetic conduction shell green body and the non-magnetic conduction shell edge green body to correspondingly form a magnetic conduction shell and a non-magnetic conduction shell edge; and cooling the magnetic conduction shell and the non-magnetic conduction shell edge to form the shell. The loudspeaker and the manufacturing method thereof realize that the non-magnetic-conduction shell edge is far away from the magnetic field, thereby avoiding the interference of the magnetic field and preventing the loss of the magnetic field intensity.

Description

Loudspeaker and manufacturing method thereof

Technical Field

The invention relates to the technical field of electroacoustic, in particular to a loudspeaker and a manufacturing method thereof.

Background

At present, the housing of the speaker is usually a plastic housing, a stamped Metal housing, or a Metal Injection Molding (MIM) Metal housing, wherein the Molding process of the plastic housing is mature, but the plastic housing does not have magnetic conductivity, and a magnetic conductive frame needs to be additionally bonded on the plastic housing of the speaker, which increases the manufacturing cost and the manufacturing process, and has a complex structure; the stamped metal shell has magnetic conductivity, and is integrally formed by stamping, the wall of the stamped metal shell is in an equal-thickness state, namely, the thickness of the whole wall of the shell is consistent, but the stamped metal shell cannot be formed into a shape with a complex structure by adopting a stamping forming process, so that the shell with a complex structure cannot be manufactured, the application range is narrow, and the magnetic saturation phenomenon is easy to occur; the MIM metal shell can be formed into a shape with a complex structure and can realize the state of unequal thickness of shell walls of the shell through an MIM process, however, a loudspeaker adopting the MIM metal shell usually has the condition of magnetic field intensity loss, and the acoustic performance of the loudspeaker is influenced.

Disclosure of Invention

The invention mainly aims to provide a loudspeaker and a manufacturing method thereof, and aims to solve the technical problem that a shell in the existing loudspeaker has magnetic field intensity loss.

In order to achieve the above object, the present invention provides a speaker, which includes a housing, and a vibration system and a magnetic circuit system that are disposed in the housing, where the vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate, the magnetic circuit system includes a magnet, the housing includes a magnetic conductive shell and a non-magnetic conductive shell edge, the magnet is mounted on the magnetic conductive shell and forms a magnetic gap with the magnetic conductive shell, the voice coil is suspended in the magnetic gap, and the non-magnetic conductive shell edge is connected to one end of the magnetic conductive shell, which is far from the magnetic gap.

Preferably, the magnetic conductive shell comprises a basin frame and two shell walls, the basin frame and the two shell walls are arranged opposite to the vibrating diaphragm, the magnet is mounted on the basin frame, the two shell walls are respectively connected to two ends of the basin frame, and one end, far away from the basin frame, of each shell wall is connected with the non-magnetic shell edge.

Preferably, each of the housing walls extends from an end of the frame in a direction away from the other housing wall.

Preferably, the non-magnetic conductive shell is folded along a direction from the edge of the shell wall to the vibrating diaphragm so as to be connected with the shell wall in a step shape, and a mounting hole is formed in the edge of the non-magnetic conductive shell.

Preferably, the magnetic conductive shell comprises a basin frame arranged opposite to the vibrating diaphragm and a shell wall surrounding the outer edge of the basin frame, the non-magnetic shell is connected with the shell wall and is distributed in a staggered mode with the magnetic gap, the magnet is mounted on the basin frame, and the shell wall is arranged around the magnet and forms the magnetic gap with the magnet.

Preferably, the shell wall extends from the basin frame towards the direction of the vibrating diaphragm, the extension length of the shell wall is not less than the height of the magnet, and the non-magnetic conduction shell is connected with one end of the shell wall far away from the basin frame.

Preferably, the non-magnetic conductive shell comprises an extension wall and a connection wall, the extension wall is connected with one end of the shell wall far away from the basin stand and extends towards the direction far away from the magnet, the connection wall is connected with one end of the extension wall far away from the magnet, the diaphragm is mounted on the connection wall, and the extension wall is provided with a damping hole.

Preferably, the magnetic circuit system further comprises a washer, the washer is arranged on one side of the magnet, which is away from the basin stand, and the surface of the extension wall, which faces the vibrating diaphragm, and the end surface of the shell wall, which is away from the basin stand, are flush with the surface of the washer, which faces the vibrating diaphragm.

Preferably, the vibrating diaphragm includes central part, the book ring portion and the installation department that connect gradually from inside to outside, the voice coil loudspeaker voice coil with the central part is connected, the connecting wall is formed with the installation step, the installation department is installed on the installation step.

Preferably, the tub frame is integrally formed with the case wall by metal injection.

Preferably, the magnetic conduction shell and the non-magnetic conduction shell are integrally formed by metal double-injection molding.

The invention also provides a manufacturing method of the loudspeaker, which is used for manufacturing the loudspeaker, and the manufacturing method of the loudspeaker comprises the following steps:

injecting magnetic conduction feed and non-magnetic conduction feed into the injection molding machine, and correspondingly forming a magnetic conduction shell green body and a non-magnetic conduction shell green body;

sintering the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact to correspondingly form the magnetic conduction shell and the non-magnetic conduction shell edge;

and cooling the magnetic conduction shell and the non-magnetic conduction shell edge to form the shell.

Preferably, the step of sintering the magnetic conductive shell green compact and the non-magnetic conductive shell rim green compact to form the magnetic conductive shell and the non-magnetic conductive shell rim correspondingly comprises:

and sintering the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 830-890 min at the sintering temperature of 1270-1330 ℃, and correspondingly forming the magnetic conduction shell and the non-magnetic conduction shell edge.

Preferably, the magnetic conduction feed is magnetic conduction particles formed by mixing magnetic conduction metal powder and an adhesive; the non-magnetic feeding material is non-magnetic particles formed by mixing non-magnetic metal powder and a binder;

before the step of sintering the magnetic conduction shell green compact and the non-magnetic conduction shell along green compact, correspondingly forming the magnetic conduction shell and the magnetic conduction shell so as to form the shell, the method further comprises the following steps:

and carrying out degreasing treatment on the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact so as to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

Preferably, the step of degreasing the magnetic conductive shell green compact and the non-magnetic shell green compact to remove the binder in the magnetic conductive shell green compact and the non-magnetic shell green compact comprises:

and degreasing the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 180-240 min at a degreasing temperature of 110-130 ℃ so as to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

In the loudspeaker, the shell is divided into two parts, namely a magnetic conduction shell and a non-magnetic conduction shell edge, wherein the magnet is arranged on the magnetic conduction shell, a magnetic gap is formed between the magnet and the magnetic conduction shell, the magnet forms a magnetic field in the magnetic gap through the magnetic conduction action of the magnetic conduction shell, and the voice coil performs reciprocating cutting magnetic line of force movement in the magnetic gap and drives the vibrating diaphragm to vibrate, so that air is driven to sound, and energy conversion between electric sound is completed. And the non-magnetic shell edge is connected to one side of the magnetic conduction shell body far away from the magnetic gap, so that the non-magnetic shell edge is far away from the magnetic field, the interference of the magnetic field is avoided, the loss of the magnetic field intensity is prevented, and the acoustic performance of the loudspeaker is ensured. And the loudspeaker shell can be integrally formed through a double-shot injection molding process, a magnetic conduction piece does not need to be additionally arranged, the manufacturing process and the structure of the loudspeaker are simplified, meanwhile, the shape of a complex structure can be formed, the unequal thickness state of the shell can be realized, and the application range is wide. In addition, in the shell integrally formed by the double-shot injection molding process, the non-magnetic-conduction shell edge and the magnetic gap are distributed in a staggered mode, so that an interference magnetic field is avoided, the loss of the magnetic field intensity is prevented, and the acoustic performance of the loudspeaker is guaranteed.

Drawings

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

Fig. 1 is a schematic perspective view of a speaker according to an embodiment of the present invention;

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

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

fig. 4 is a schematic flow chart of a first embodiment of a method for manufacturing a speaker according to the present invention;

fig. 5 is a flowchart illustrating a method for manufacturing a speaker according to a second embodiment of the present invention. .

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Loudspeaker	21	Center part
10	Outer casing	22	Folded ring part
				11	Magnetic conductive shell	23	Mounting part
111	Basin rack	24	Reinforcing part
				112	Casing wall	30	Voice coil
12	Non-magnetic conduction shell edge	40	Magnet
				121	Extension wall	41	Center magnet
122	Connecting wall	42	Edge magnet
				123	Damping hole	50	Magnetic gap
124	Mounting step	60	Washer
				125	Mounting hole	70	Steel ring
20	Vibrating diaphragm

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

Detailed Description

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

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

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

The invention provides a loudspeaker.

As shown in fig. 1 to fig. 3, the speaker 100 of the present embodiment includes a housing 10, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are disposed in the housing 10, the vibration system includes a diaphragm 20 and a voice coil 30 for driving the diaphragm 20 to vibrate, the magnetic circuit system includes a magnet 40, the housing 10 includes a magnetic conductive shell 11 and a non-magnetic conductive shell rim 12, the magnet 40 is mounted on the magnetic conductive shell 11 and forms a magnetic gap 50 with the magnetic conductive shell 11, the voice coil 30 is suspended in the magnetic gap 50, and the non-magnetic conductive shell rim 12 is connected to an end of the magnetic conductive shell 11 away from the magnetic gap 50.

In the speaker 100 of the present embodiment, the housing 10 is divided into two parts, namely, a magnetic conductive casing 11 and a non-magnetic conductive casing 12, wherein the magnet 40 is mounted on the magnetic conductive casing 11, and the magnetic gap 50 is formed between the magnet 40 and the magnetic conductive casing 11, it can be understood that the magnetic conductive casing 11 shown in fig. 1 and 2 is disposed at the bottom of the magnet 40, and the magnetic gap 50 is also formed between the magnetic conductive casing 11 and the magnet 40 in such a structure, that is, although the magnetic conductive casing 11 is disposed only at the bottom of the magnet 40, the magnetic conductive casing 11 and the magnet 40 together form a magnetic circuit, and the magnetic conductive casing 11 forms a part of the magnetic circuit, so that the magnetic gap 50 is also formed between the magnetic conductive casing 11 and the magnet 40 shown in fig. 1 and 2. The magnet 40 forms a magnetic field in the magnetic gap 50 through the magnetic conduction action of the magnetic conduction shell 11, and the voice coil 30 makes reciprocating cutting magnetic lines of force movement in the magnetic gap 50 and drives the diaphragm 20 to vibrate, so that air is driven to sound, and energy conversion between electric sounds is completed. The casing 10 of the present embodiment further has a non-magnetic conductive casing edge 12, and the non-magnetic conductive casing edge 12 is connected to one end of the magnetic conductive casing 11 away from the magnetic gap 50, so that the non-magnetic conductive casing edge 12 is away from the magnetic field, thereby avoiding interference with the magnetic field, preventing loss of the magnetic field strength, and ensuring the acoustic performance of the speaker 100.

The speaker 100 may be circular, square, racetrack, or other shape. As shown in fig. 1 and fig. 2, in an embodiment, the magnetic conductive housing 11 includes a frame 111 opposite to the diaphragm 20, and two housing walls 112, the magnet 40 is mounted on the frame 111, the two housing walls 112 are respectively connected to two ends of the frame 111, and one end of each housing wall 112 away from the frame 111 is connected to the non-magnetic housing rim 12.

Specifically, the diaphragm 20 and the frame 111 are disposed opposite to each other, the two housing walls 112 are respectively disposed at the left and right ends of the frame 111, the magnet 40 is mounted on the frame 111, and the magnet 40 is located between the two housing walls 112. The magnet 40 of the present embodiment includes a center magnet 41 and side magnets 42 provided on both sides of the center magnet 41, and a magnetic field is formed between the center magnet 41 and each of the side magnets 42. The basin frame 111 and the shell wall 112 are both magnetic conductive members, and the magnet 40 forms a magnetic field in the magnetic gap 50 through the magnetic conduction action of the basin frame 111 and the shell wall 112, so that the structural design is reasonable. Furthermore, the magnetic conduction shell 11 is an MIM metal magnetic conduction shell 11, the basin stand 111 and the shell wall 112 are integrally formed by metal injection, and the shape of a complex structure can be formed by the MIM metal magnetic conduction shell 11, so that the unequal thickness state of the magnetic conduction shell 11 can be realized, flexibility and convenience are realized, the application range is wide, and the magnetic saturation phenomenon is avoided.

Each wall 112 extends from the end of the frame 111 away from the other wall 112, i.e. the left positioned wall 112 extends to the left from the left end of the frame 111 and the right positioned wall 112 extends to the left from the left end of the frame 111. As shown in figure 1, the shell wall 112 is arranged basically flush with the basin stand 111, the extending direction of the shell wall 112 is consistent with the length direction of the basin stand 111, the structural design is reasonable, and the manufacturing is convenient.

Further, the non-magnetic conductive shell is folded along 12 from the edge of the shell wall 112 toward the direction of the diaphragm 20 to form a step-shaped connection with the shell wall 112, and the non-magnetic conductive shell is provided with a mounting hole 125 along 12. As shown in fig. 1 and 2, the non-magnetic conductive shell is folded upwards from the edge of the shell wall 112 along the edge 12 to form a mounting protrusion connected with the shell wall 112 in a step shape, so as to be conveniently connected with other components of the whole machine through the mounting hole 125.

In another embodiment, as shown in fig. 3, the magnetically conductive housing 11 includes a frame 111 disposed opposite to the diaphragm 20 and a wall 112 surrounding the outer edge of the frame 111, the non-magnetic housing is connected to the wall 112 along the rim 12 and is disposed to be offset from the magnetic gap 50, the magnet 40 is mounted on the frame 111, and the wall 112 is disposed around the magnet 40 and forms the magnetic gap 50 with the magnet 40. As shown in fig. 3, the diaphragm 20 and the frame 111 are disposed opposite to each other, the wall 112 surrounds the outer edge of the frame 111 and surrounds the space for accommodating the magnet 40 with the frame 111, the magnet 40 is mounted on the frame 111, and the wall 112 surrounds the magnet 40 and forms a magnetic gap 50 with the magnet 40. It can be understood that the basin frame 111 and the housing wall 112 are both magnetic conductive members, and the magnet 40 forms a magnetic field in the magnetic gap 50 through the magnetic conductive action of the basin frame 111 and the housing wall 112, and the structural design is reasonable. Furthermore, the magnetic conduction shell 11 is an MIM metal magnetic conduction shell 11, the basin stand 111 and the shell wall 112 are integrally formed by metal injection, and the shape of a complex structure can be formed by the MIM metal magnetic conduction shell 11, so that the unequal thickness state of the magnetic conduction shell 11 can be realized, flexibility and convenience are realized, the application range is wide, and the magnetic saturation phenomenon is avoided. Moreover, the non-magnetic conductive shell edge 12 and the magnetic gap 50 are distributed in a staggered manner, that is, the non-magnetic conductive shell edge 12 is not arranged corresponding to the magnetic gap 50, so that the non-magnetic conductive shell edge 12 is positioned outside the magnetic field, the magnetic field interference is avoided, the loss of the magnetic field intensity is prevented, and the acoustic performance of the loudspeaker 100 is ensured.

The wall 112 extends from the frame 111 towards the diaphragm 20, and the wall 112 extends for a length no less than the height of the magnet 40, and the non-magnetic casing is connected to the end of the wall 112 away from the frame 111 along the edge 12. As shown in fig. 1, a wall 112 extends upward from the bottom of the tub 111, and a non-magnetic casing 12 is connected to the upper end of the casing, and the wall 112 extends not less than the height of the magnet 40. It can be understood that the extension length of the housing wall 112 is the height of the housing wall 112, the height of the housing wall 112 is not less than the height of the magnet 40, that is, the height of the housing wall 112 is greater than or equal to the height of the magnet 40, and the non-magnetic conductive housing edge 12 is connected to the upper end of the housing wall 112, so that there is no overlapping area between the non-magnetic conductive housing edge 12 and the magnet 40, and the non-magnetic conductive housing edge 12 and the magnetic gap 50 are distributed in a staggered manner, and the structure design is ingenious and simple.

The non-magnetic conductive housing 12 of this embodiment includes an extension wall 121 and a connection wall 122, the extension wall 121 is connected to one end of the housing wall 112 away from the frame 111 and extends in a direction away from the magnet 40, the connection wall 122 is connected to one end of the extension wall 121 away from the magnet 40, the diaphragm 20 is mounted on the connection wall 122, the extension wall 121 is provided with a damping hole 123, and the damping hole 123 can equalize sound pressure inside the speaker 100. As shown in fig. 1, the magnet 40 is located inside the casing wall 112, a direction away from the magnet 40 is an outside of the casing wall 112, the extension wall 121 is connected to the upper end of the frame 111 and extends outward, the connection wall 122 is connected to an outer edge of the extension wall 121, the diaphragm 20 is mounted on the connection wall 122, an extension area of the diaphragm 20 is enlarged, the diaphragm 20 can drive more areas of air generation when vibrating, and the sound effect of the speaker 100 is improved.

Further, the magnetic circuit system further includes a washer 60, the washer 60 is disposed on a side of the magnet 40 away from the frame 111, and both a surface of the extension wall 121 facing the diaphragm 20 and an end surface of the shell wall 112 away from the frame 111 are flush with a surface of the washer 60 facing the diaphragm 20. As shown in fig. 3, the washer 60 is disposed on the upper side of the magnet 40, so as to modify the magnetic force emitted by the magnet 40 and improve the acoustic performance of the speaker 100, the height of the housing wall 112 is equal to the sum of the height of the magnet 40 and the height of the washer 60, and the upper surface of the extension wall 121 and the upper end surface of the housing wall 112 are both flush with the upper surface of the washer 60, so that the non-magnetic-conductive housing is staggered along the magnetic field of 12, the structure is compact and reasonable, the occupied space is small, and the micro-design of the speaker 100 is realized.

As shown in fig. 3, the diaphragm 20 includes a central portion 21, a corrugated portion 22, and a mounting portion 23 connected in sequence from inside to outside, the voice coil 30 is connected to the central portion 21, the connecting wall 122 is formed with a mounting step 124, and the mounting portion 23 is mounted on the mounting step 124. Further, the voice coil 30 is bonded on the lower side of the central portion 21, the reinforcing portion 24 (Dome) is further bonded on the upper side of the central portion 21, the reinforcing portion 24 is arranged in the middle of the diaphragm 20, the strength of the diaphragm 20 is increased, the diaphragm 20 is prevented from generating segmentation vibration in a high-frequency band, the vibration stability of the diaphragm 20 is ensured, and the acoustic performance of a product is improved. The flexure 22 is connected between the horizontal portion and the mounting portion 23, and maintains axial vibration of the diaphragm 20 and ensures axial reciprocation of the voice coil 30 in the magnetic gap 50. The outer circumference of the mounting portion 23 may be fixed to the mounting step 124 of the connection wall 122 by the steel ring 70, so that the diaphragm 20 is assembled with the housing 10.

The magnetic conduction shell 11 and the non-magnetic conduction shell rim 12 of the invention are integrally formed by double-shot injection molding. The housing 10 is integrally formed through a metal double-shot injection molding process, a magnetic conduction part is not required to be additionally arranged, the manufacturing process and the structure of the loudspeaker 100 are simplified, meanwhile, the shape of a complex structure can be formed, and the unequal thickness state of the housing 10 can be realized, for example, as shown in fig. 3, the thickness of the bottom basin frame 111 in the housing 10 is larger than that of the shell wall 112, the structural strength of the bottom basin frame 111 is ensured, the components such as the magnet 40 and the washer 60 can be favorably carried, the thickness of the shell wall 112 is slightly narrower, the space can be saved while the normal use is ensured, and the application range is wide.

The speaker 100 may be manufactured by uniformly mixing metal powder with an organic binder, such as POM (polyoxymethylene), PE (polyethylene), and paraffin, and granulating to obtain a magnetic-conductive feed and a non-magnetic-conductive feed. The magnetic conduction feeding materials and the non-magnetic conduction feeding materials are molded in an injection machine under the semi-solid state condition to manufacture magnetic conduction shell bodies 11 and non-magnetic conduction shell body blanks 12 with complex shapes. After degreasing, the binder is removed from the green body of the magnetically conductive housing 11 and the green body of the non-magnetically conductive shell 12. And sintering at high temperature to form a magnetic conductive shell body 11 and the non-magnetic conductive shell edge 12, and cooling to obtain the shell 10 with good mechanical property and physical property.

The present invention also proposes a method for manufacturing a loudspeaker, which is used for manufacturing the loudspeaker 100, and in particular, the method for manufacturing a loudspeaker is used for manufacturing the housing 10 of the loudspeaker 100. Fig. 4 is a schematic flow chart of a first embodiment of a method for manufacturing a speaker according to the present invention, which includes the following steps:

s100, injecting magnetic conduction feed and non-magnetic conduction feed into an injection molding machine, and correspondingly forming a magnetic conduction shell green body and a non-magnetic conduction shell green body;

magnetic conductive metal powder and non-magnetic conductive metal powder are used as raw materials, for example, stainless steel metal powder such as 304 or 316L is used as magnetic conductive metal powder, stainless steel metal powder with the pH of 17-4 is used as non-magnetic conductive metal powder, the magnetic conductive metal powder and the non-magnetic conductive metal powder are respectively made into magnetic conductive feed and non-magnetic conductive feed, and the magnetic conductive feed and the non-magnetic conductive feed are injected into an injection molding machine, so that a magnetic conductive shell 11 green compact and a non-magnetic conductive shell edge 12 green compact are injection molded.

Step S200, sintering the magnetic conduction shell green body and the non-magnetic conduction shell edge green body to correspondingly form the magnetic conduction shell and the non-magnetic conduction shell edge;

sintering the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 green compact in a high-temperature furnace or a vacuum furnace in a protective atmosphere, and forming the magnetic conduction shell body 11 through a series of physical and chemical processes of diffusion, recrystallization, fusion welding, chemical combination, dissolution and the like among particles of the magnetic conduction shell body 11 green compact in the sintering process. Similarly, the non-magnetic shell edge 12 is formed by a series of physical and chemical processes such as diffusion, recrystallization, fusion welding, combination, dissolution and the like among particles of the non-magnetic shell edge 12 in the sintering process.

And step S300, cooling the magnetic conduction shell and the non-magnetic conduction shell edge, and forming the shell.

The sintered magnetic conductive shell 11 and the non-magnetic conductive shell edge 12 are in a high-temperature state, and after cooling, the shell 10 is formed. The magnetic conduction shell 11 and the non-magnetic conduction shell can be formed into the shell 10 through natural cooling, and the method is simple and convenient.

In the manufacturing method of the loudspeaker of the embodiment, a magnetic conduction feeding and a non-magnetic conduction feeding are injected into an injection molding machine, and a magnetic conduction shell body 11 green compact and a non-magnetic conduction shell edge 12 green compact are correspondingly molded; sintering the green compact of the magnetic conduction shell body 11 and the green compact of the non-magnetic conduction shell edge 12 to correspondingly form the magnetic conduction shell body 11 and the non-magnetic conduction shell edge 12; after cooling, the magnetic conductive shell 11 and the non-magnetic conductive shell edge 12 are molded into the outer shell 10, so that the double-shot injection molding process of the outer shell 10 is completed, and the outer shell 10 is integrally molded. The shell 10 of this embodiment is through bijection injection molding technology integrated into one piece, need not additionally to set up magnetic conduction spare, the manufacture craft and the structure of speaker 100 have been simplified, simultaneously, can the shaping shape of complicated structure, and can realize shell 10's the not uniform thickness state, for example, the thickness of bottom basin frame 111 in the shell 10 is greater than the thickness of conch wall 112, guarantee the structural strength of bottom basin frame 111, do benefit to parts such as bearing magnet 40 and china department 60, and the thickness of conch wall 112 is then some narrow a bit, can guarantee to use normally and save space simultaneously, the range of application is wide. In addition, in the case 10 integrally formed by the double-shot injection molding process, the non-magnetic shell edge 12 is far away from the end connected to the magnetic conduction shell 11 far away from the magnetic gap 50, so that the non-magnetic shell edge 12 is far away from the magnetic field, the interference of the magnetic field is avoided, the loss of the magnetic field intensity is prevented, and the acoustic performance of the loudspeaker 100 is ensured. Further, in the case 10 integrally formed by the two-shot injection molding process, the non-magnetic conductive shell edge 12 and the magnetic gap 50 are distributed in a staggered manner, that is, the non-magnetic conductive shell edge 12 is not arranged corresponding to the magnetic gap 50, so that the non-magnetic conductive shell edge 12 is located outside the magnetic field, the magnetic field interference is avoided, the loss of the magnetic field strength is prevented, and the acoustic performance of the speaker 100 is ensured.

In this embodiment, step S200 includes:

step S2011: and sintering the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 830-890 min at the sintering temperature of 1270-1330 ℃, and correspondingly forming the magnetic conduction shell and the non-magnetic conduction shell edge.

And sintering the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 green compact at the sintering temperature of 1270-1330 ℃ for 830-890 min, so that the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 green compact can be well formed. The sintering temperature and the sintering time can be flexibly selected according to the types of the green compact of the magnetic conductive shell 11 and the green compact of the non-magnetic conductive shell 12. And naturally cooling the green compact of the magnetic conduction shell body 11 and the non-magnetic conduction shell edge 12, and forming the shell 10. According to the actual situation, the formed shell 10 can be subjected to post-treatment, and the post-treatment comprises fine pressing, rolling, extrusion, quenching, surface quenching, oil immersion, infiltration and the like.

The magnetic conduction feed of the embodiment is magnetic conduction particles formed by mixing magnetic conduction metal powder and an adhesive; the non-magnetic feeding material is non-magnetic particles formed by mixing non-magnetic metal powder and a binder; the adhesive can be POM, PE, paraffin and the like, and the magnetic conductive metal powder is mixed with the adhesive to form a magnetic conductive feed with moldability and plasticity. Similarly, after the adhesive is mixed with the non-magnetic conductive metal powder, the non-magnetic conductive metal powder forms a non-magnetic feed with formability and plasticity. Further, as shown in fig. 5, a schematic flow chart of a second embodiment of the manufacturing method of the speaker according to the present invention is shown, and based on the first embodiment, before the step S200, the method further includes:

and S101, carrying out degreasing treatment on the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

The choice of binder determines the degreasing method. The binder can be gradually removed during the temperature raising or holding stage to maintain the green strength until a small amount of pre-sintering occurs. The goal of degreasing is to minimize the degreasing time without defects and deformation and to ensure that the chemical composition of the degreased green body is controlled within an allowable range. Various degreasing methods can be adopted for different binders, and mainly thermal degreasing, solvent degreasing, catalytic degreasing and the like are adopted. The degreasing method can be selected according to the type of the binder, for example, when the binder is POM, the binder can be degreased by a thermal degreasing method, and the POM can be thermally degraded at a high temperature to separate the binder from the magnetic conductive shell 11 and the non-magnetic conductive shell 12, which is beneficial to subsequent sintering.

Specifically, the step S101 includes:

and S1011, degreasing the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 180-240 min at the degreasing temperature of 110-130 ℃ so as to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

And degreasing the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 green compact for 180-240 min at the degreasing temperature of 110-130 ℃, so that the binder in the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 can be degraded, and the binder is separated from the magnetic conduction shell body 11 green compact and the non-magnetic conduction shell edge 12 green compact, and is beneficial to subsequent sintering. The degreasing temperature and the degreasing time can be flexibly selected according to the type of the binder.

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

Claims (14)

1. A loudspeaker comprises a shell, and a vibration system and a magnetic circuit system which are arranged in the shell, and is characterized in that the vibration system comprises a vibrating diaphragm and a voice coil for driving the vibrating diaphragm to vibrate, the magnetic circuit system comprises a magnet, the shell comprises a magnetic conduction shell and a non-magnetic conduction shell edge, the magnet is arranged on the magnetic conduction shell and forms a magnetic gap with the magnetic conduction shell, the voice coil is suspended in the magnetic gap, and the non-magnetic conduction shell edge is connected with one end, far away from the magnetic gap, of the magnetic conduction shell; the magnetic conduction shell and the non-magnetic conduction shell are integrally formed through metal double-shot injection molding.

2. The loudspeaker of claim 1, wherein said magnetically conductive housing includes a frame disposed opposite said diaphragm, and two walls, said magnet being mounted to said frame, said two walls being connected to respective ends of said frame, each of said walls being connected to said non-magnetic rim at an end remote from said frame.

3. A loudspeaker according to claim 2, wherein each of the housing walls extends from an end of the frame in a direction away from the other of the housing walls.

4. The loudspeaker of claim 3, wherein the non-magnetic conductive shell is folded in a direction from the edge of the housing wall toward the diaphragm to form a step-like connection with the housing wall, and the non-magnetic conductive shell has a mounting hole formed along its edge.

5. The loudspeaker of claim 1, wherein the magnetically conductive housing includes a frame disposed opposite the diaphragm and walls surrounding an outer edge of the frame, the non-magnetic shells being connected to the walls and being offset from the magnetic gap, the magnet being mounted on the frame, the walls being disposed around the magnet and forming the magnetic gap with the magnet.

6. The loudspeaker of claim 5, wherein the wall extends from the frame in a direction toward the diaphragm, and the wall extends no less than the height of the magnet, the non-magnetic conductive shell being connected along an end of the wall remote from the frame.

7. The loudspeaker of claim 6, wherein the non-magnetic conductive enclosure includes an extension wall connected to an end of the enclosure wall remote from the frame and extending away from the magnet, and a connecting wall connected to an end of the extension wall remote from the magnet, wherein the diaphragm is mounted to the connecting wall, and wherein the extension wall defines a damping orifice.

8. The loudspeaker of claim 7, wherein the magnetic circuit further comprises a washer disposed on a side of the magnet facing away from the frame, and wherein a surface of the extension wall facing the diaphragm and an end surface of the casing wall facing away from the frame are flush with a surface of the washer facing the diaphragm.

9. The loudspeaker of claim 7, wherein the diaphragm comprises a central portion, a bending ring portion and an installation portion, the central portion, the bending ring portion and the installation portion are sequentially connected from inside to outside, the voice coil is connected with the central portion, the connection wall is formed with an installation step, and the installation portion is installed on the installation step.

10. A loudspeaker according to claim 2 or 5, wherein the frame is integrally formed with the wall by metal injection.

11. A method of manufacturing a loudspeaker for use in manufacturing a loudspeaker according to any one of claims 1 to 10, the method comprising the steps of:

injecting magnetic conduction feed and non-magnetic conduction feed into the injection molding machine, and correspondingly forming a magnetic conduction shell green body and a non-magnetic conduction shell green body;

sintering the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact to correspondingly form the magnetic conduction shell and the non-magnetic conduction shell edge;

and cooling the magnetic conduction shell and the non-magnetic conduction shell edge to form the shell.

12. The method of claim 11 wherein said step of sintering said green magnetically permeable shell and said non-magnetically permeable rim to form said green magnetically permeable shell and said non-magnetically permeable rim comprises:

and sintering the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 830-890 min at the sintering temperature of 1270-1330 ℃, and correspondingly forming the magnetic conduction shell and the non-magnetic conduction shell edge.

13. The method of claim 11, wherein the magnetically conductive feed material is magnetically conductive particles formed by mixing magnetically conductive metal powder with a binder; the non-magnetic feeding material is non-magnetic particles formed by mixing non-magnetic metal powder and a binder;

before the step of sintering the magnetic conduction shell green compact and the non-magnetic conduction shell along green compact, correspondingly forming the magnetic conduction shell and the magnetic conduction shell so as to form the shell, the method further comprises the following steps:

and carrying out degreasing treatment on the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact so as to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

14. The method of claim 13 wherein the step of degreasing the green magnetically permeable shell and the non-magnetically permeable shell rim to remove the binder from the green magnetically permeable shell and the non-magnetically permeable shell rim comprises:

and degreasing the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact for 180-240 min at a degreasing temperature of 110-130 ℃ so as to remove the adhesive in the magnetic conduction shell green compact and the non-magnetic conduction shell edge green compact.

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