WO2022166375A1 - Sound production unit - Google Patents

Abstract

A sound production unit. The sound production unit comprises a housing having an accommodation space, and a magnetically conductive diaphragm and two magnetic circuit systems arranged in the accommodation space; the two magnetic circuit systems are opposite to and spaced apart from each other, each magnetic circuit system comprises a magnetic steel attached onto the housing and a coil arranged around the magnetic steel, and the magnetic steel is of a solid structure; the magnetically conductive diaphragm is arranged between the two magnetic circuit systems and is separately spaced apart from the two magnetic circuit systems, and the magnetically conductive diaphragm is configured to vibrate and produce sound under the action of an alternating electromagnetic field generated by the magnetic circuit systems. By arranging the coil around the magnetic steel, a large driving force is generated in a central region of the magnetically conductive diaphragm, thereby facilitating the magnetically conductive diaphragm generating vibration.

Description

sounding unit technical field

The utility model relates to the technical field of electro-acoustic conversion, in particular to a sound-generating monomer.

Background technique

Micro-speakers are often required to be installed in existing electronic devices, and most of the existing micro-speakers are energized through the voice coil, so that the voice coil moves in the gap, so that the voice coil drives the diaphragm to vibrate. During the vibrating and sounding process of the diaphragm, the voice coil and the diaphragm move together, resulting in large vibration quality, poor high-frequency sound quality, and low electro-acoustic conversion efficiency.

Therefore, it is necessary to provide a new type of sound-generating monomer to solve the above technical problems.

Utility model content

The main purpose of the present invention is to provide a sound-generating unit, which aims to solve at least one technical problem in the existing speaker structure.

In order to achieve the above-mentioned purpose, the sound-generating unit provided by the present invention includes a housing with an accommodation space, a magnetic conducting diaphragm and two magnetic circuit systems arranged in the accommodation space, and the two magnetic circuit systems are opposite to each other. spaced, the magnetic circuit system includes a magnetic steel attached to the casing and a coil arranged around the magnetic steel, the magnetic steel is a solid structure; the magnetic conductive diaphragm is arranged on two of the The magnetic circuit systems are spaced apart from the two magnetic circuit systems respectively, and the magnetic conductive diaphragm is used to vibrate and emit sound under the action of the alternating electromagnetic field generated by the magnetic circuit systems.

Optionally, the magnetization directions of the magnetic steels of the two magnetic circuit systems are the same, and the current directions of the coils of the two magnetic circuit systems are opposite.

Optionally, the housing includes a first magnetic yoke and a second magnetic yoke that cooperate to form the receiving space, and the magnetic conductive diaphragm is arranged between the first magnetic yoke and the second magnetic yoke, The two magnetic circuit systems are respectively arranged in the space surrounded by the first magnetic yoke and the magnetically conductive diaphragm and in the space surrounded by the second magnetic yoke and the magnetically conductive diaphragm.

Optionally, the first yoke includes a top wall and a first side wall extending from the top wall, the second yoke includes a bottom wall and a second side wall extending from the bottom wall; two In the magnetic circuit system, the magnetic steel of one of the magnetic circuit systems is arranged on the top wall and forms a first gap with the first side wall, and the magnetic steel of the other magnetic circuit system is arranged on the top wall. A second gap is formed between the bottom wall and the second side wall, and the two coils are respectively arranged in the first gap and the second gap.

Optionally, the first side wall and the second side wall respectively fix the magnetic conductive diaphragm from opposite sides of the magnetic conductive diaphragm.

Optionally, the first magnetic yoke and/or the second magnetic yoke are provided with sound outlet holes communicating with the receiving space.

Optionally, an end of the first side wall close to the second side wall is recessed to form the sound outlet hole.

Optionally, the sound outlet holes are opened on the bottom wall and the top wall, and the two sound outlet holes communicate with the first gap and the second gap respectively. .

Optionally, the magnetic conductive diaphragm is a planar magnetic conductive diaphragm.

Optionally, the magnetic conductive diaphragm is a metal diaphragm.

In the present invention, the magnetic circuit system is arranged on both sides of the magnetic conductive diaphragm, so that the energization of the coil can be controlled, so that the magnetic circuit system can generate an alternating electromagnetic field, and the magnetic conductive diaphragm can vibrate in the space under the action of the alternating electromagnetic field. Internal vibration, eliminating the need to set up a voice coil connected to the diaphragm, so that only the magnetic conductive diaphragm vibrates, the quality of the vibration components to be driven by the magnetic circuit system is small, the high-frequency performance can be improved, and the sound-electric conversion efficiency can be improved; the utility model By arranging the coil around the magnetic steel, a larger driving force is generated in the central area of the magnetic conductive diaphragm, which is beneficial to the magnetic conductive diaphragm to generate vibration.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without any creative effort.

1 is a schematic cross-sectional structure diagram of an embodiment of a sound-emitting monomer of the present invention;

2 is a schematic diagram of the disassembled structure of an embodiment of a sound-emitting monomer of the present invention;

FIG. 3 is a schematic diagram of the force analysis of the coil of an embodiment of the present invention when the coil is not energized;

FIG. 4 is a schematic diagram of the force analysis of the coil of an embodiment of the present invention when the coil is energized.

Description of the reference numerals of the embodiment:

label	name	label		name
10	sounding unit	1	case
11	first yoke	111	top wall
113	first side wall	12	sound hole
13	second yoke	131	bottom wall
133	second side wall	3	Magnetic diaphragm
5	Magnetic circuit system	51	magnetic steel
53	coil

The realization, functional characteristics and advantages of the purpose of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the difference between the various components under a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.

In addition, the descriptions involving "first", "second", etc. in the present invention are only for description purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist. , is not within the scope of protection required by the present utility model.

The utility model proposes a sound generating unit 10 .

Referring to FIGS. 1 and 2 , the technical solution of the present invention proposes a sound-generating unit 10 , the sound-generating unit 10 includes a housing 1 having an accommodation space, a magnetic conductive diaphragm 3 and two A magnetic circuit system 5, two of the magnetic circuit systems 5 are arranged at an interval relative to each other, and the magnetic circuit system 5 includes a magnetic steel 51 attached to the housing 1 and a coil 53 arranged around the magnetic steel 51, so The magnetic steel 51 is a solid structure; the magnetic conductive diaphragm 3 is arranged between the two magnetic circuit systems 5 and is separately arranged from the two magnetic circuit systems 5, and the magnetic conductive diaphragm 3 is used for Under the action of the alternating electromagnetic field generated by the magnetic circuit system 5 , it vibrates and emits sound.

In the prior art, the voice coil is connected to the diaphragm, and the voice coil is inserted into the magnetic gap. After the voice coil is energized, under the action of the magnetic field, the voice coil reciprocates in the magnetic gap to push the diaphragm to vibrate. The difference between the present invention and the prior art in which the voice coil pushes the diaphragm to produce sound is that the present invention does not provide a voice coil connected to the magnetic conductive diaphragm 3 , and the coil 53 is spaced from the magnetic conductive diaphragm 3 . When the coils 53 located on both sides of the magnetic conductive diaphragm 3 are energized, the two magnetic circuit systems 5 interact to generate an alternating electromagnetic field. moving in the direction of the connection line, that is, vibrating and sounding in the vibration space formed between the two magnetic circuit systems 5 . During the sounding process of the sounding unit 10, only the magnetic conductive diaphragm 3 moves, and the coil 53 and the magnetic steel 51 in the magnetic circuit system 5 may not move. When the coils 53 located on both sides of the magnetic conductive diaphragm 3 are not energized, the magnetic conductive diaphragm 3 is only affected by the magnetic field generated by the magnetic steel 51 located on both sides. At this time, the magnetic size and shape of the two magnetic steels 51 can be controlled. etc., so that the magnetic conductive diaphragm 3 can remain stationary at a preset position in the vibration space.

Compared with the setting method of arranging the coil 53 inside the magnetic steel 51, the present invention arranges the coil 53 around the magnetic steel 51, so that in the magnetic field generated by the magnetic circuit system 5, the intensity of the permanent magnetic field in the central area is higher than that in the edge area. When the coil 53 is energized, the magnetic field strength of the alternating magnetic field experienced by the central region of the magnetic conductive diaphragm 3 is greater than the magnetic field strength of the alternating magnetic field received by the edge region of the magnetic conductive diaphragm 3, so the magnetic conductivity The driving force received by the central area of the diaphragm 3 is greater than the driving force received by the edge area of the magnetic conductive diaphragm 3, so that the magnetic conductive diaphragm 3 is more easily affected by the alternating electromagnetic field to generate sound and vibrate. In one embodiment, the magnetic steel 51 , the coil 53 and the balance diaphragm are coaxially arranged to facilitate vibration balance.

In the present invention, by arranging the magnetic circuit system 5 on both sides of the magnetic conductive diaphragm 3, the energization of the coil 53 can be controlled, so that the magnetic circuit system 5 generates an alternating electromagnetic field, and the magnetic conductive diaphragm 3 is alternating Under the action of the electromagnetic field, it can vibrate in the vibration space, eliminating the need for a voice coil connected to the diaphragm, so that only the magnetic conductive diaphragm 3 vibrates, and the vibration components to be driven by the magnetic circuit system 5 are of small mass, which can improve high-frequency performance, and can Improve the sound-electric conversion efficiency; the present utility model arranges the coil 53 around the magnetic steel 51, so that the driving force generated in the central area of the magnetic conductive diaphragm 3 is larger, which is beneficial to the magnetic conductive diaphragm 3 to generate vibration.

Optionally, the magnetization directions of the magnets 51 of the two magnetic circuit systems 5 are the same, and the current directions of the coils 53 of the two magnetic circuit systems 5 are opposite.

Please refer to FIGS. 3 and 4 , wherein FIG. 3 is a force analysis diagram of the magnetic conductive diaphragm 3 in an embodiment when the coil 53 is not energized; FIG. 4 is a magnetic conductive vibration in an embodiment when the coil 53 is energized Force analysis diagram of membrane 3. In the embodiment shown in FIG. 3 , the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, that is, the magnetic steel 51 has a The magnetization direction is the same, the direction of the magnetic field line is from the N pole to the S pole, and the magnetic field line is the direction shown by the arrow in the figure because of the magnetic permeability of the magnetic permeable diaphragm 3 . Since the magnetic conductive diaphragm 3 is subjected to opposite directions of the magnetic forces of the two magnetic steels 51 , the magnetically conductive diaphragm 3 can be suspended between the two magnetic steels 51 in a balanced manner.

In the embodiment shown in FIG. 4 , the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, and are located at the upper magnetic steel at the same time. The current direction of the coil 53 outside 51 is left in and right out, and the current direction of the coil 53 outside the lower magnetic steel 51 is right in and left out, that is, the current directions of the two coils 53 are opposite. According to Ampere's Law, it is determined that the upper end of the coil 53 above the magnetically conductive diaphragm 3 is S pole and the lower end is N-level.

The opposite sides of the magnetic conductive diaphragm 3 are magnetized by the upper magnetic steel 51 and the lower magnetic steel 51 to generate polarity. The upper side of the magnetic conductive diaphragm 3 is the N pole, and the lower side is the S pole; the lower end of the upper coil 53 is the N pole. The upper end of the lower coil 53 is N pole and the lower side of the magnetic conductive diaphragm 3 attracts the opposite sex, so that under the action of the two superimposed forces, the magnetic conductive diaphragm 3 moves toward the upper side of the magnetic conductive diaphragm 3. The lower deformation generates vibration, thereby further improving the electro-acoustic conversion efficiency of the sound-generating unit 10 .

From another perspective, as shown in Figure 3, when the two coils are not energized, the magnetic flux in the magnetic permeable diaphragm is ΦA=Φ _g1 +Φ _g2 =Φ _g +(-Φ _g )≈0; among them, Φ _g1 is the magnetic flux generated by the upper magnetic steel 51, the direction of φ _g1 is defined as the positive direction, Φ _g2 is the magnetic flux generated by the lower magnetic steel 51, the magnetic flux generated by the lower magnetic steel 51 and the magnetic flux generated by the upper magnetic steel 51 are the same in size and opposite in direction, Its direction is negative.

As shown in FIG. 4 , when the two coils are supplied with opposite currents, the magnetic flux of the magnetic conductive diaphragm 3 subjected to the upper magnetic circuit system 5 is: φ ₁ =φ _g1 +φ _i1 =φ _g +(-φ _i ), where , the direction of the magnetic flux generated by the current of the upper coil 53 is opposite to the direction of the magnetic flux generated by the upper magnetic steel 51 , which is a negative direction.

The magnetic flux of the magnetic conductive diaphragm 3 received by the lower magnetic circuit system 5 is: φ ₂ =φ _g2 +φ _i2 =(-φ _g )+(-φ _i ), the direction of the magnetic flux generated by the current of the lower coil 53 is generated by the lower magnetic steel 51 The direction of the magnetic flux is the same, which is the negative direction.

Therefore, the magnetic flux φ ₁ received by the magnetic diaphragm 3 from the upper magnetic circuit system 5 < the magnetic flux φ ₂ received by the magnetic conductive diaphragm 3 from the lower magnetic circuit system 5 .

And, when the two coils pass through the reverse current, ΦA'=Φ ₁₊ Φ ₂₌ Φ _g +(-Φ _i )+(-Φ _g )+(-Φ _i )=-2Φ _i , if this energized state In the final state, the initial state with no potential applied, the change of the magnetic flux in the magnetic permeable diaphragm 3 is: Δφ=ΦA'-ΦA=-2φ _i -0=-2φ _i .

The electromagnetic force Fφ received by the magnetic conductive diaphragm 3 is proportional to the rate of change of the magnetic flux, that is, Fφ is proportional to Δφ/Δt=−2φ _i /Δt.

In the embodiment shown in FIG. 4 , the electromagnetic force Fφ pushes the magnetic conductive diaphragm 3 to move toward the lower magnetic circuit system 5 . Similarly, when the current direction of the coil 53 above and below the magnetic conductive diaphragm 3 is the opposite direction as shown in FIG. 4 , through the above derivation process, it can be known that the magnetic conductive diaphragm 3 is subjected to the magnetic flux of the upper magnetic circuit system 5 φ ₁ ′>magnetic conductive vibration The membrane 3 is subjected to the magnetic flux φ ₂ ' of the magnetic circuit system 5 below, and the electromagnetic force Fφ' received by the magnetic permeable diaphragm 3 is proportional to the rate of change of the magnetic flux, that is, Fφ' and Δφ'/Δt=2φ _i /Δt proportional. The electromagnetic force generated by the magnetic circuit system 5 pushes the magnetic conductive diaphragm 3 to move closer to the upper magnetic circuit system 5 , so that the magnetic conductive diaphragm 3 can be controlled to vibrate and emit sound by controlling the current in the coil 53 .

Please refer to FIGS. 1 and 2 again, the housing 1 includes a first magnetic yoke 11 and a second magnetic yoke 13 that cooperate to form the receiving space, and the magnetic conductive diaphragm 3 is disposed on the first magnetic yoke 11 and the second magnetic yoke 13 . Between the second magnetic yokes 13 , the two magnetic circuit systems 5 are respectively disposed in the space surrounded by the first magnetic yoke 11 and the magnetic conductive diaphragm 3 , and the second magnetic yokes 13 and in the space surrounded by the magnetic conductive diaphragm 3 . The first magnetic yoke 11 and the second magnetic yoke 13 are magnetic conductive parts, the magnetic conductive diaphragm 3 is in direct contact with the magnetic conductive shell 1, and the magnetic circuit is more concentrated and complete, so that the magnetic field of the magnetic circuit system 5 can be concentrated in the shell In the body 1, it is beneficial to improve the electro-acoustic conversion efficiency.

Optionally, the first magnetic yoke 11 includes a top wall 111 and a first side wall 113 extending from the top wall 111 , and the second magnetic yoke 13 includes a bottom wall 131 and a first side wall 113 extending from the bottom wall 131 . The second side wall 133; the magnetic steel 51 of one of the two magnetic circuit systems 5 is disposed on the top wall 111 and forms a first gap with the first side wall 113, Another magnetic steel 51 of the magnetic circuit system 5 is disposed on the bottom wall 131 and forms a second gap with the second side wall 133 , and the two coils 53 are respectively disposed in the first gap and inside the second gap, that is, from outside to inside, the first side wall 113, a coil 53 and a magnetic steel 51 are successively sleeved, and the second side wall 133, another coil 53 and another magnetic steel 51 are sleeved successively Assume. The magnetic steel 51 can be directly attached to the top wall 111 or the bottom wall 113 , while the coil 53 can be wound on the magnetic steel 51 , or can be pre-wound and attached to the top wall 111 or the bottom wall 113 . The components of the magnetic circuit system 5 are set in sequence, thereby effectively reducing the size of the sounding unit 10 .

Optionally, the first side wall 113 and the second side wall 133 respectively fix the magnetic conductive diaphragm 3 from opposite sides of the magnetic conductive diaphragm 3, that is, the edge of the magnetic conductive diaphragm 3 can be It is fixed on the end of the first side wall 113 or the second side wall 133 by gluing, welding, etc., and then the first magnetic yoke 11 and the second magnetic yoke 13 are fixed together with the cover, and no other fixing structure is required. Fewer parts make product assembly easier. At the same time, since the magnetic conductive diaphragm 3 is directly fixed by the first magnetic yoke 11 and the second magnetic yoke 13 , no other fixing components are provided between the magnetic conductive diaphragm 3 and the magnetic circuit system 5 . The magnetic field distribution between 5 is not affected by other fixed components, and no separate component is required to support the magnetic circuit system 5, which can reduce the gap between the magnetically conductive diaphragm 3 and the magnetic circuit system 5, which is beneficial to improve the sound-electric conversion efficiency.

The first magnetic yoke 11 and/or the second magnetic yoke 13 are provided with sound outlet holes 12 communicating with the receiving space, so as to facilitate the air flow propelled by the magnetic conductive diaphragm 3 to propagate to the outside. Those skilled in the art can open sound outlet holes 12 at different positions of the housing 1 that communicate with the receiving space and the outside as required. For example, the sound outlet 12 is opened on the first side wall 113 and/or the second side wall 133. Specifically, the end of the first side wall 113 close to the second side wall 133 is recessed to form a The sound hole 12 is described. In another embodiment, the sound outlet holes 12 are opened on the bottom wall 131 and the top wall 111 , and the two sound outlet holes 12 are respectively connected to the first gap and the second gap. Connected.

In one embodiment, the magnetic conductive diaphragm 3 is a planar magnetic conductive diaphragm or a metal diaphragm. Compared with the diaphragm having a folded ring structure in the prior art, the planar magnetic conductive diaphragm 3 provided in the present invention can reduce the size of the sounding unit 10 . Specifically, the magnetic conductive diaphragm 3 includes a metal body, and the metal body includes one or more of stainless steel S430, silicon steel, SPCC, iron-nickel alloy, iron-cobalt-vanadium alloy, and soft ferrite. Compared with rubber or paper diaphragms, when the metal body vibrates, the sound quality emitted has a metallic texture. The magnetic conductive diaphragm 3 may also include a damping layer disposed on the metal body, and the damping layer may be an adhesive film layer, PEEK, TPU, TPEE, or the like. The damping property of the magnetic conductive diaphragm 3 can be adjusted through the damping layer, which is beneficial to the balance of the vibration of the magnetic conductive diaphragm 3 and brings a more delicate hearing sense. In another embodiment, the magnetic conductive diaphragm 3 includes a base material and a magnetic conductive layer disposed on the base material, and the base material is any one of metal or non-metal, elastomer or non-elastomeric body The magnetic conductive layer is a powder with soft magnetic properties such as nickel, iron-nickel alloy, iron-phosphorus alloy, etc., which is disposed on the base material by plating, deposition, magnetron sputtering, and the like. The thickness of the magnetic conductive diaphragm 3 is 10-40um.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Under the concept of the utility model of the present utility model, the equivalent structure transformation made by using the contents of the description and the accompanying drawings of the present utility model, or directly / Indirect applications in other related technical fields are included in the scope of patent protection of the present utility model.

Claims (10)

1. A sound-generating unit, characterized in that the sound-generating unit includes a housing with a receiving space, a magnetic conductive diaphragm and two magnetic circuit systems arranged in the receiving space, and the two magnetic circuit systems are opposite to each other. spaced, the magnetic circuit system includes a magnetic steel attached to the casing and a coil arranged around the magnetic steel, the magnetic steel is a solid structure; the magnetic conductive diaphragm is arranged on two of the The magnetic circuit systems are spaced apart from the two magnetic circuit systems respectively, and the magnetic conductive diaphragm is used to vibrate and emit sound under the action of the alternating electromagnetic field generated by the magnetic circuit systems.
2. The sound-generating unit according to claim 1, wherein the magnetization directions of the magnetic steels of the two magnetic circuit systems are the same, and the current directions of the coils of the two magnetic circuit systems are opposite.
3. The sound-generating unit according to claim 1, wherein the housing comprises a first magnetic yoke and a second magnetic yoke that cooperate to form the receiving space, and the magnetic conductive diaphragm is arranged on the first magnetic Between the yoke and the second magnetic yoke, the two magnetic circuit systems are respectively arranged in the space surrounded by the first magnetic yoke and the magnetic conductive diaphragm, and the second magnetic yoke and the magnetic conductive diaphragm are respectively arranged in the space surrounded by the magnetic diaphragm.
4. The sound-generating unit of claim 3, wherein the first magnetic yoke includes a top wall and a first side wall extending from the top wall, and the second magnetic yoke includes a bottom wall and a first side wall extending from the top wall. a second side wall extending from the bottom wall; the magnetic steel of one of the two magnetic circuit systems is arranged on the top wall and forms a first gap with the first side wall, and the other The magnetic steel of the magnetic circuit system is arranged on the bottom wall and forms a second gap with the second side wall, and the two coils are respectively arranged in the first gap and the second gap .
5. The sound-generating unit according to claim 4, wherein the first side wall and the second side wall respectively fix the magnetic conductive diaphragm from opposite sides of the magnetic conductive diaphragm.
6. The sound-generating unit according to claim 4, characterized in that, the first magnetic yoke and/or the second magnetic yoke are provided with sound outlet holes communicating with the receiving space.
7. The sound-generating unit according to claim 6, wherein an end of the first side wall close to the second side wall is recessed to form the sound outlet hole.
8. The sound-generating unit according to claim 6, wherein the sound-outlet holes are opened on the bottom wall and the top wall, and the two sound-outlet holes are respectively connected to the first gap and the The second gap communicates.
9. The sound-generating unit according to any one of claims 1 to 8, wherein the magnetic conductive diaphragm is a planar magnetic conductive diaphragm.
10. The sound-generating unit according to any one of claims 1 to 8, wherein the magnetic conductive diaphragm is a metal diaphragm.

Images