CN108347680B - Acoustic generator - Google Patents
Acoustic generator Download PDFInfo
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- CN108347680B CN108347680B CN201810438332.6A CN201810438332A CN108347680B CN 108347680 B CN108347680 B CN 108347680B CN 201810438332 A CN201810438332 A CN 201810438332A CN 108347680 B CN108347680 B CN 108347680B
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- 230000005672 electromagnetic field Effects 0.000 claims abstract description 71
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 238000009434 installation Methods 0.000 claims abstract description 18
- 239000000696 magnetic material Substances 0.000 claims abstract description 6
- 230000008602 contraction Effects 0.000 claims description 22
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000003993 interaction Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/08—Microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention relates to the technical field of sound production, and discloses a sound generator, which comprises a shell with an installation cavity and a vibrating diaphragm mechanism arranged in the installation cavity, wherein the vibrating diaphragm mechanism divides the installation cavity into a first cavity and a second cavity which are arranged side by side; the device is characterized by further comprising a limiting component which is made of soft magnetic materials and is provided with a closed cavity, wherein one side of the closed cavity, which faces the vibrating diaphragm mechanism, is provided with an opening, and the opening is bent from outside to inside to form a shrinkage opening; an electromagnetic member located in the second cavity and mounted in the closed cavity for generating an electromagnetic field and transmitting the electromagnetic field to the confining assembly; the magnetic generating piece is fixed on the vibrating diaphragm mechanism and stretches into the shrinkage opening to provide a fixed magnetic field. In the invention, the electromagnetic field is limited in the closed cavity of the limiting assembly, so that magnetic leakage is not easy to occur, the acting force between magnetic fields is enhanced, and the output efficiency and sound of the audio frequency are further improved.
Description
Technical Field
The invention relates to the technical field of sound production, in particular to a sound generator.
Background
The receiver is a microminiature electroacoustic device for converting an audio electric signal into a sound signal under the condition of no sound leakage so as to realize audio replay, and is widely applied to the field of portable electronic equipment such as mobile phones, notebook computers, earphones, hearing aids and the like.
With the continuous development of technology, the structure of the receiver is also improved continuously. For example, a conventional receiver is formed by dividing a housing into a first cavity and a second cavity through a vibrating diaphragm mechanism, wherein a U-shaped pole shoe is arranged in the second cavity, an iron core sleeved with a coil is arranged in the U-shaped pole shoe, and a permanent magnet is fixed on one side, close to the second cavity, of the vibrating diaphragm mechanism. The working principle of the telephone receiver is that the permanent magnet drives the vibrating diaphragm mechanism to vibrate reciprocally in the cavity under the driving force of the electromagnetic field generated after the coil is electrified and the fixed magnetic field generated by the permanent magnet, so that sound production is realized.
However, the electromagnetic field generated by the telephone receiver with the structure after the coil is electrified is formed to be open through the iron core and the U-shaped pole shoe, so that the electromagnetic field leakage is larger, namely, the electromagnetic field actually participating in driving the permanent magnet to vibrate is fewer, the acting force between the electromagnetic field and the fixed magnetic field is greatly reduced, and the audio output efficiency and sound are lower.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the technical defects of low audio output efficiency and low sound of the receiver in the prior art.
The invention provides a sounder, which comprises a shell with an installation cavity and a vibrating diaphragm mechanism arranged in the installation cavity, wherein the vibrating diaphragm mechanism divides the installation cavity into a first cavity and a second cavity which are arranged side by side; characterized by further comprising:
the limiting assembly is made of soft magnetic materials, and is provided with a closed cavity, one side of the closed cavity, facing the vibrating diaphragm mechanism, is open, and the open port is bent from outside to inside to form a contracted port;
an electromagnetic member located within the second cavity and mounted within the closed cavity for generating an electromagnetic field and transmitting the electromagnetic field to the confinement assembly;
the magnetic generating piece is fixed on the vibrating diaphragm mechanism and extends into the contraction opening to provide a fixed magnetic field.
Optionally, the limiting component comprises a hollow cylinder, and the surface of the hollow cylinder facing one side of the vibrating diaphragm mechanism is provided with the contraction opening; a cylinder disposed within the hollow cylinder;
the electromagnetic field generated by the electromagnetic member is transmitted to the hollow cylinder body through the cylinder body.
Optionally, the hollow cylinder body comprises a cylinder body with the opening close to one side of the vibrating diaphragm mechanism and a cover body fixed on the opening, and the contraction opening is formed on the cover body; or alternatively
The hollow cylinder body comprises a cylinder body with an opening far away from one side of the vibrating diaphragm mechanism and a cover body fixed on the opening, and the contraction opening is formed in the wall surface of the cylinder body close to one side of the vibrating diaphragm mechanism.
Optionally, the housing includes a first housing and a second housing, and the first housing and the second housing are fastened to form the installation cavity; the second housing serves as the cartridge body.
Optionally, the wall thickness of the second housing is greater than the wall thickness of the first housing.
Optionally, the hollow cylinder is mounted in the second cavity of the housing.
Optionally, the proportional relationship between the wall thickness H of the wall surface where the shrinkage port is located and the thickness H of the magnetic generating piece is: h is 7H/6 or more.
Optionally, the magnetic generating piece is a permanent magnet, and the outer peripheral surface of the permanent magnet is a smooth arc surface.
Optionally, the permanent magnet is a cylinder, and the proportional relation between the diameter D of the permanent magnet and the thickness H of the permanent magnet is: D/H is more than 0 and less than or equal to 2.5, and the magnetic field distribution of the axial end face of the permanent magnet is mushroom head-shaped.
Optionally, the electromagnetic member is a coil sleeved on the column and located in the hollow cylinder.
Optionally, an auxiliary magnetizer is arranged on an end surface of the magnetic generating piece, which is opposite to the vibrating diaphragm mechanism, so that an electromagnetic loop is formed between the electromagnetic field on the limiting assembly and the auxiliary magnetizer.
Optionally, the sounder further comprises:
An auxiliary permanent magnet disposed in the first cavity opposite to the magnetic generating member; the polarities of the end of the auxiliary permanent magnet, which faces the magnetic generating piece, are opposite;
the magnetic field intensity of the auxiliary permanent magnet is smaller than that of the electromagnetic field generated by the electromagnetic piece.
Optionally, the diaphragm mechanism includes:
An elastic vibration plate fixed on the inner wall surface of the housing;
and the sounding film is covered on one side surface of the elastic vibrating plate.
Optionally, the sounder is a receiver.
Compared with the prior art, the sounder provided by the invention has the following advantages:
1. according to the sounder provided by the invention, the fixed magnetic field provided by the magnetic generating piece can act with the electromagnetic field generated by the electromagnetic piece, the magnetic generating piece vibrates in the installation cavity under the drive of the interaction force between the magnetic fields, the direction of the electromagnetic field can be controlled by controlling the direction of current, and the vibration direction of the magnetic generating piece can be controlled, so that the magnetic generating piece drives the vibrating diaphragm mechanism connected with the magnetic generating piece to reciprocate, and sound production is realized.
Because the electromagnetic member is arranged in the closed cavity of the limiting assembly, and the limiting assembly is made of soft magnetic materials, an electromagnetic field generated after the electromagnetic member is electrified can magnetize the limiting assembly, and the electromagnetic field is limited in the closed cavity of the limiting assembly, so that magnetic leakage is not easy to occur, most of the electromagnetic field generated by the electromagnetic member can act with a fixed magnetic field, the acting force between magnetic fields is enhanced, and the output efficiency and sound of audio frequency are further improved. Meanwhile, the limiting component is provided with a shrinkage opening for placing the magnetic generating piece, so that an electromagnetic field can be transmitted to the shrinkage opening, and the electromagnetic field can fully act with a fixed magnetic field generated by the magnetic generating piece arranged in the shrinkage opening, and the acting force between magnetic fields is enhanced.
2. The sound generator provided by the invention has the advantages that the limiting component comprises the hollow cylinder body with the shrinkage opening and the cylinder body positioned in the hollow cylinder body, and the arrangement of the cylinder body can transmit the electromagnetic field generated by the electromagnetic piece to the shrinkage opening of the hollow cylinder body on one hand, so that the fixed magnetic fields at two sides generated by the magnetic generating piece act on the electromagnetic field at the shrinkage opening; on the other hand, the scattered electromagnetic fields can be gathered, and the electromagnetic fields gathered on the column body can act with the fixed magnetic field which is generated by the magnetic generating piece and is close to the end part of the column body. Therefore, the interaction force between the electromagnetic field and the fixed magnetic field is fully utilized, and high-quality sounding is realized.
3. The sound generator provided by the invention has the advantages that the hollow cylinder body can have various structural types, on one hand, the hollow cylinder body comprises a cylinder body, one side of the cylinder body, which is close to the vibrating diaphragm mechanism, is provided with an opening, a cover body is fixed on the opening, and a contraction opening is formed in the cover body; on the other hand, the hollow cylinder body comprises a cylinder body, the cylinder body is provided with an opening far away from one side of the vibrating diaphragm mechanism, the opening is provided with a corresponding cover body, and the contraction opening is arranged on the wall surface of the other side of the cylinder body. The structure of the hollow cylinder body corresponds to different sounder assembly methods respectively, can be selected according to actual requirements, and is flexible.
4. The shell comprises the first shell and the second shell, wherein the second shell is directly used as the cylinder body of the hollow cylinder body, so that the structure and the assembly process of the sound generator are simplified, and the manufacturing cost and the later maintenance difficulty are reduced.
5. The wall thickness of the second shell is larger than that of the first shell. Because the magnetic force line distribution of the magnetic field follows the principle of approaching and the principle of going to a small resistance path, most of the electromagnetic field is limited in the second shell, namely the limiting component, and is not easy to leak into the first shell or the outside.
6. The ratio relation between the thickness H of the hole wall of the wall surface where the shrinkage opening is positioned and the thickness H of the magnetic generating piece is as follows: when H is more than or equal to 7H/6, the interaction force between the electromagnetic field at the contraction opening and the fixed magnetic field can be maximized, so that the acting force and the utilization rate between the magnetic fields are improved, the working efficiency of the sounder is further improved, and higher audio output power and sound are obtained.
7. The magnetic generating piece of the sounder provided by the invention is a permanent magnet, and the outer peripheral surface of the magnetic generating piece is a smooth arc surface. Therefore, the fixed magnetic field at the end part of the magnetic generating piece is distributed uniformly, the interaction force between the electromagnetic field and the fixed magnetic field is uniform, the stability of vibration of the vibrating diaphragm mechanism is ensured, and the sounding effect of the sounder is further ensured.
8. According to the sounder provided by the invention, the auxiliary magnetizer is arranged on the end surface of one side, facing away from the vibrating diaphragm mechanism, of the magnetic generating piece, and the auxiliary magnetizer can enable an electromagnetic field at the shrinkage opening of the limiting assembly and the auxiliary magnetizer to form an electromagnetic loop, so that the magnetic field acting force between the electromagnetic field and the fixed magnetic field is enhanced.
9. The sounder provided by the invention further comprises an auxiliary permanent magnet arranged in the first cavity, wherein the auxiliary permanent magnet is arranged opposite to the magnetic generating piece, and the polarities of one ends of the auxiliary permanent magnet and the magnetic generating piece, which are mutually opposite, are opposite. The auxiliary permanent magnet can be used for applying force far away from the column body to the magnetic generating piece by utilizing the attractive force of the auxiliary permanent magnet to the magnetic generating piece, so that the magnetic generating piece can be prevented from bending towards the column body direction due to the attractive force of the column body in the limiting assembly when the sounder is in an initial state.
Meanwhile, the magnetic field intensity of the auxiliary permanent magnet is smaller than that of an electromagnetic field generated by the electromagnetic piece, so that after the electromagnetic piece is electrified, the magnetic generating piece can realize reciprocating vibration under the magnetic field effect of the electromagnetic field, and the magnetic generating piece is not blocked by the attractive force of the auxiliary permanent magnet.
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 needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a sound generator according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a sound generator according to embodiment 2 of the present invention;
Fig. 3 is a schematic structural diagram of a sound generator according to embodiment 3 of the present invention;
Fig. 4 is a schematic structural diagram of a sound generator according to embodiment 4 of the present invention;
FIG. 5 is a magnetic field distribution diagram of the sounder according to embodiment 1 of the present invention;
FIG. 6 is a graph showing the magnetic field distribution of the acoustic generator according to comparative example 1 of the present invention;
Fig. 7 is a magnetic field distribution diagram of the acoustic generator provided in comparative example 2 of the present invention.
Reference numerals illustrate:
1-a housing; 102-a first housing; 103-a second housing; 104-a first cavity; 105-a second cavity;
2-a vibrating diaphragm mechanism; 201-an elastic vibration plate; 202-a sound producing membrane;
3-defining an assembly; 301-closing the cavity; 302 hollow cylinder; 3021-a cartridge body; 3022-a cover; 303-column; 304-shrinking opening;
4-electromagnetic members; 5-a magnetic generating member; 6-auxiliary magnetizer; 7-auxiliary permanent magnets; 8-a sound outlet hole; 9-sound guide tube.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. 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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The present embodiment provides a sound generator, as shown in fig. 1, including a housing 1 having an installation cavity, and a diaphragm mechanism 2 disposed in the installation cavity, where the diaphragm mechanism 2 divides the installation cavity into a first cavity 104 and a second cavity 105 side by side.
The housing 1 includes a first housing 102 and a second housing 103, the first housing 102 is formed by a first bottom surface and a side wall, the second housing 103 is formed by a second bottom surface and a side wall, and the first housing 102 and the second housing 103 are buckled to form a hollow installation cavity. The side wall of the first shell 102 is provided with a sound outlet 8, and the periphery of the sound outlet 8 is provided with a sound guide tube 9.
The first housing 102 and the second housing 103 are detachably mounted, and the position of the sound outlet hole 8 is not limited to the side wall of the first housing 102, and may be disposed on the side wall of the second housing 103 or disposed on the side walls of the first housing 102 and the second housing 103 at the same time.
The diaphragm mechanism 2 is fixed to the inner wall surface of the first housing 102, and divides the installation cavity into a first cavity 104 and a second cavity 105 which are positioned in the first housing 102 and are not communicated with each other, and are arranged side by side.
As a modification, the diaphragm mechanism 2 may be fixed to the inner wall surface of the second housing 103, or may be fixed between the openings of the first housing 102 and the second housing 103.
The diaphragm mechanism 2 includes an elastic diaphragm 201 and a sounding film 202. The elastic vibration plate 201 is made of a non-magnetic conductive material, and its outer edge is fixed on the inner wall surface of the first housing 102 or the inner wall surface of the second housing 103 or between the openings of the first housing 102 and the second housing 103. The sound emitting film 202 covers one side surface of the elastic vibration plate 201, and may be provided on a surface of the elastic vibration plate 201 facing the first chamber 104 or on a surface of the elastic vibration plate 201 facing the second chamber 105. Generally, the sound emitting film 202 is fixed to the elastic vibration plate 201 by means of adhesion.
The sounder further comprises a defining assembly 3, an electromagnetic member 4 and a magnetic generating member 5.
Wherein the limiting component 3 is made of soft magnetic materials, such as ferrosilicon alloy, low carbon steel, ferroaluminum alloy, soft magnetic ferrite and the like. The limiting assembly 3 has a closed cavity 301, which closed cavity 301 presents an opening towards the side of the diaphragm mechanism 2, and which opening is bent from outside to inside to form a constriction 304.
The limiting assembly 3 comprises a hollow cylinder 302 and a cylinder 303 arranged in the hollow cylinder 302, an electromagnetic field generated by the electromagnetic member 4 is transmitted to the hollow cylinder 302 through the cylinder 303, and a contraction opening 304 is formed in the surface of one side of the hollow cylinder 302 facing the diaphragm mechanism 2. Wherein, the electromagnetic member 4 is installed in the hollow cylinder 302 for generating an electromagnetic field, and the electromagnetic member 4 is generally a coil sleeved on the cylinder 303, and the coil can generate the electromagnetic field according to the electromagnetic induction principle by electrifying the coil.
In this embodiment, the hollow cylinder 302 is mounted in the second cavity 105 of the housing 1, the hollow cylinder 302 includes a cylinder body 3021 and a cover 3022, the cylinder body 3021 includes a closed side wall and a bottom, and has an opening opened near one side (top in the drawing) of the diaphragm mechanism 2, the cover 3022 is fixed on the opening, and the contraction opening 304 is opened on the cover 3022.
The corners of the barrel 3021 are rounded, and no sharp corners are present. Thus, the maldistribution of the electromagnetic field transmitted to the hollow cylinder can be avoided.
The magnetic generating piece 5 is fixed on the vibrating diaphragm mechanism 2 and stretches into the shrinkage opening 304 to provide a fixed magnetic field, and a certain gap is kept between the magnetic generating piece 5 and the wall surface of the shrinkage opening 304. Typically, the magnetic generating member 5 is a permanent magnet.
In this embodiment, the magnetic generating element 5 is located at the center of the contraction opening 304, and the area of the diaphragm mechanism 2 where the magnetic generating element 5 is fixed is protruded toward the second cavity 105, that is, the other area of the diaphragm mechanism 2 is protruded toward the first cavity 104 relative to the area where the magnetic generating element 5 is fixed. Therefore, gaps between other areas on the diaphragm mechanism 2 and the limiting assembly 3 are increased, and the phenomenon that the diaphragm mechanism 2 collides with the limiting assembly 3 when vibrating to influence the sounding effect is avoided.
According to the sounder provided by the embodiment, the fixed magnetic field provided by the magnetic generating piece 5 can act with the electromagnetic field generated by the electromagnetic piece 4, the magnetic generating piece 5 vibrates in the installation cavity under the driving of the interaction force between the magnetic fields, the electromagnetic field direction can be controlled by controlling the current direction, the vibration direction of the magnetic generating piece 5 can be controlled, the magnetic generating piece 5 drives the vibrating diaphragm mechanism 2 connected with the magnetic generating piece to reciprocate, and the air in the installation cavity is driven to realize sound production.
Because the electromagnetic member 4 is installed in the closed cavity 301 of the limiting assembly 3, and the limiting assembly 3 is made of soft magnetic material, the electromagnetic field generated after the electromagnetic member 4 is electrified can magnetize the limiting assembly 3, and the electromagnetic field is limited in the closed cavity 301 of the limiting assembly 3, so that magnetic leakage is not easy to occur, most of the electromagnetic field generated by the electromagnetic member 4 can be ensured to act with a fixed magnetic field, the acting force between magnetic fields is enhanced, and the output efficiency and sound of audio frequency are further improved. Meanwhile, the limiting assembly is provided with a shrinkage port 304 for placing the magnetic generating piece 5, so that an electromagnetic field can be transmitted to the shrinkage port 304, and the electromagnetic field can fully act with a fixed magnetic field generated by the magnetic generating piece 5 arranged in the shrinkage port 304, thereby enhancing the acting force between magnetic fields. And the direction of the electromagnetic field at the contraction opening 304 and the direction of the fixed magnetic field are relatively perpendicular to each other, so that the acting force between the electromagnetic field at the contraction opening 304 and the fixed magnetic field of the sounder with the structure is relatively strong according to the halbach array principle, and good vibration frequency is ensured.
In addition, the cylinder 303 can transmit the electromagnetic field generated by the electromagnetic member 4 to the contraction opening 304 of the hollow cylinder 302, so that the fixed magnetic fields on two sides generated by the magnetic generating member 5 act on the electromagnetic field at the contraction opening 304; on the other hand, the scattered electromagnetic fields can be collected, and the electromagnetic field collected on the column 303 can act on the fixed magnetic field near the end of the column 303 generated by the magnetic generating element 5. Therefore, the interaction force between the electromagnetic field and the fixed magnetic field is fully utilized, and high-quality sounding is realized.
In this embodiment, the thickness of the hollow cylinder 302 is greater than the thickness of the second housing 103 and the first housing 102. Since the distribution of the magnetic field lines of the magnetic field follows the principle of close proximity and the principle of small path of resistance, most of the electromagnetic field is confined in the hollow cylinder 302, i.e. the confinement assembly 3, and is not easy to leak to the second housing 103 and/or the first housing 102, or even to the outside.
In this embodiment, the outer peripheral surface of the permanent magnet is a smooth arc surface, so that the fixed magnetic field at the end of the magnetic generating element 5 is uniformly distributed, and the interaction force between the electromagnetic field concentrated at the end of the cylinder 303 and the fixed magnetic field at the end of the magnetic generating element 5 is uniform, so that the stability of vibration of the vibrating diaphragm mechanism 2 is ensured, and the sound producing effect of the sound generator is further ensured.
In this embodiment, the permanent magnet is a cylinder, and the proportional relationship between the diameter D of the permanent magnet and the thickness H thereof is: D/H is more than 0 and less than or equal to 2.5. For example, D/H is 0.05, 0.15, 0.25, 0.3, 0.5, 0.8, 1.2, 1.4, 1.82, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc. When the proportional relation between the diameter D of the permanent magnet and the thickness H thereof is more than 0 and less than or equal to 2.5, the magnetic field distribution of the axial end face of the cylindrical permanent magnet can be adjusted by adjusting the ratio of the diameter to the thickness of the permanent magnet, and the magnetic field distribution of the end face of the cylindrical permanent magnet is mushroom-head-shaped, namely the magnetic field distribution from the middle to the edge of the end face of the cylindrical permanent magnet along the radial direction is more uniform, so that the interaction between the end face of the permanent magnet and the electromagnetic field on the end face of the cylindrical permanent magnet is enhanced, and the output efficiency and sound of audio frequency are further improved. Further preferably, the permanent magnet has a proportional relationship of the diameter D to the thickness H thereof: 1.5 < D/H < 2.5.
In this embodiment, the proportional relationship between the thickness H of the magnetic generating element 5 and the wall thickness H of the wall surface where the shrinkage port 304 is located is: h is 7H/6 or more. Specifically, the vibration amplitude f of the magnetic generating member 5 plays a decisive role in the sound pressure (or intensity) effect of the sound generator. In this embodiment, when the coil is not energized, i.e., in the initial state, the radial center of the magnetic generating member 5 is aligned with the radial center at the constricted opening 304; when the coil is energized, the magnetic generating element 5 vibrates in the range of h/2-h/3 along the center upward or downward, i.e. the vibration amplitude f isWhen the sound pressure effect of the sound generator is optimal, namely, H-H is more than or equal toNamely, when H is more than or equal to 7H/6, the sound intensity characteristic of the sounder can be ensured to be good.
In this embodiment, an auxiliary magnetizer 6 is disposed on an end surface of the magnetic generating element 5 facing away from the vibrating diaphragm mechanism 2, and the auxiliary magnetizer 6 is disposed so that an electromagnetic loop can be formed between the electromagnetic field on the limiting assembly 3 and the auxiliary magnetizer 6, thereby enhancing the interaction force between the electromagnetic field and the fixed magnetic field.
In this embodiment, the sounder further includes an auxiliary permanent magnet 7 disposed in the first cavity 104 opposite to the magnetic generating element 5, and the polarity of one end of the auxiliary permanent magnet 7 facing the magnetic generating element 5 is opposite; the magnetic field strength of the auxiliary permanent magnet 7 is smaller than the magnetic field strength of the electromagnetic field generated by the electromagnet 4. The auxiliary permanent magnet 7 can use the attractive force of the auxiliary permanent magnet to the magnetic generating piece 5 to apply a force far away from the column 303 to the magnetic generating piece 5, so that the magnetic generating piece 5 can be prevented from bending towards the column 303 due to the attractive force of the column 303 in the limiting assembly 3 when the sounder is in an initial state.
Meanwhile, the magnetic field intensity of the auxiliary permanent magnet 7 is smaller than that of the electromagnetic field generated by the electromagnetic piece 4, so that the magnetic generating piece 5 can realize reciprocating vibration under the action of the magnetic field of the electromagnetic field after the electromagnetic piece 4 is electrified, and the attraction of the auxiliary permanent magnet 7 is not hindered.
As an alternative embodiment, the auxiliary permanent magnet 7 may be replaced by a soft magnetic auxiliary magnetizer.
In this embodiment, the sounder may be a receiver, or may be other sounders, which all belong to the protection scope of the present invention.
The embodiment also provides an assembling method of the sounder, which comprises the following steps:
step S11, attaching the sound producing film 202 to the elastic vibration plate 201 to form a diaphragm mechanism 2;
step S12, fixing the magnetic generating piece 5 on the vibrating diaphragm mechanism 2, and fixing the auxiliary magnetizer 6 on the surface of the magnetic generating piece 5, which is far away from one side of the vibrating diaphragm mechanism 2;
Step S13, fixing the auxiliary permanent magnet 7 on the inner wall surface of the first shell 102;
step S14, sleeving the coil on the column 303 in the hollow cylinder 302 through the opening of the hollow cylinder 302, and fixing the cover 3022 on the opening;
step S15, fixing the hollow cylinder 302 with the coil mounted on the inner wall surface of the second shell 103;
In step S16, the first housing 102 and the second housing 103 that are assembled respectively are buckled and assembled, and meanwhile, the outer edge of the diaphragm mechanism 2 is fixed between the openings of the first housing 102 and the second housing 103, and the magnetic generating element 5 fixed on one side surface of the diaphragm mechanism 2 extends into the shrinkage opening 304 on the cover 3022 of the hollow cylinder 302.
It should be noted that, step S11, step S13 and step S14 may be performed synchronously, so as to save assembly time.
As a modification, the outer edge of the diaphragm mechanism 2 in step S16 may not be fixed between the openings of the first housing 102 and the second housing 103, but the outer edge of the diaphragm mechanism 2 may be fixed to the inner wall surface of the first housing 102 or the second housing 103 after step S12 is completed.
Example 2
The present embodiment provides a sound generator, which differs from the sound generator provided in embodiment 1 in that: the hollow cylinder 302 is structurally different.
As shown in fig. 2, in this embodiment, the hollow cylinder 302 includes a cylinder body 3021 and a cover 3022, where an opening is provided on a side of the cylinder body 3021 away from the diaphragm mechanism 2, and the cover 3022 is fixed on the opening to close the opening, where the opening may be an open port or a semi-open port. The contraction opening 304 is formed on a wall surface of the cylinder body 3021 on a side close to the diaphragm mechanism 2.
The method of assembling the acoustic generator provided in this embodiment differs from the method of assembling the acoustic generator provided in embodiment 1 in that:
In step S14, the cylinder 303 and the cover 3022 are fixed in advance, the coil is sleeved on the cylinder 303, and the cover 3022 is fixed on the opening of the cylinder main body 3021 to close the opening.
Example 3
The present embodiment provides a sound generator, which is different from the sound generator provided in embodiment 1 or embodiment 2 in that: the second housing 103 is different in structure.
As shown in fig. 3, in this embodiment, a through hole is formed at the bottom of the second housing 103, and the bottom of the hollow cylinder 302 (i.e., the side of the hollow cylinder 302 away from the diaphragm mechanism 2) is disposed in the through hole.
When the sound generator is subjected to strong vibration caused by external force, the hollow cylinder 302 and the cylinder 303 in the hollow cylinder are not easy to deviate from the central position of the fixed magnetic field, so that the conditions of reduced sensitivity, reduced sound, increased distortion and the like occur.
The method of assembling the acoustic generator provided in this embodiment differs from the method of assembling the acoustic generator provided in embodiment 1 or embodiment 2 in that:
Step S15, the hollow cylinder 302 with the coil mounted thereon is placed in the second housing 103 through the top opening or bottom through hole of the second housing 103, and the bottom of the hollow cylinder 302 is fixed in the bottom through hole of the second housing 103.
Example 4
The present embodiment provides a sound generator, which is different from the sound generator provided in embodiment 1 or embodiment 2 or embodiment 3 in that: as shown in fig. 4, in this embodiment, the second housing 103 is directly used as the cylinder body 3021 of the hollow cylinder 302, and there is no need to further provide a hollow cylinder 302 in the second housing 103 as a limiting component, which simplifies the structure and the assembly process of the sound generator, and reduces the manufacturing cost and the subsequent maintenance difficulty.
In this embodiment, the wall thickness of the second housing 103 is greater than that of the first housing 102, and since the distribution of magnetic lines of force of the magnetic field follows the principle of approaching and going to the path of small resistance, most of the electromagnetic field will be confined in the second housing 103, i.e. the confinement assembly 3, and will not leak into the first housing 102 or outside.
The method of assembling the acoustic generator provided in this embodiment differs from the method of assembling the acoustic generator provided in embodiment 1 or embodiment 2 or embodiment 3 in that:
The second housing 103 may be directly used as the hollow cylinder 302 without separately providing the hollow cylinder 302, so that the step S15 may be omitted, and the assembly process is simplified.
Example 5
The present embodiment provides a sound generator, which differs from the sound generator provided in embodiment 1 in that:
In the embodiment, the permanent magnet is not a cylinder, and only needs to meet the requirement that the outer peripheral surface of the permanent magnet is a smooth arc surface; and/or the end surface of the magnetic generating piece 5, which is opposite to the vibrating diaphragm mechanism 2, can be provided with no auxiliary magnetizer 6; and/or the sound generator does not comprise an auxiliary permanent magnet 7 arranged in the first cavity 104.
Comparative example 1
This comparative example provides a sound generator which differs from the sound generator provided in embodiments 1 to 5 in that:
The limiting assembly is provided with an opening facing one side of the vibrating diaphragm mechanism, but the opening is not bent from outside to inside to form a shrinkage opening.
Comparative example 2
This comparative example provides a sound generator which differs from the sound generator provided in embodiments 1 to 5 in that:
the open mouth of the limiting component is bent from outside to inside to form a contracted mouth, but the limiting component does not have a closed cavity.
Fig. 5 to 7 are computer simulation magnetic field distribution diagrams corresponding to the structures of the sounders in example 1, comparative example 1 and comparative example 2, respectively. In fig. 5, because the electromagnetic field is in a tank, the magnetic force lines are more concentrated in distribution, the magnetic leakage is smaller, the magnetic field intensity at the magnetic gap is larger, and the electromagnetic field and the fixed magnetic field are fully acted; whereas in fig. 6 and 7 the leakage is larger, the interaction of the electromagnetic field and the fixed magnetic field is much smaller than in fig. 5. In fig. 5, one end of the electromagnetic field is always transmitted to the contraction opening, the interaction between the electromagnetic field and the fixed magnetic field at the contraction opening is more sufficient, while in fig. 6, the limiting assembly is in a U-shaped open type, the part of the electromagnetic field actually participating in the magnetic field is less, and in fig. 7, the limiting assembly does not have a closed cavity although the opening of the limiting assembly forms the contraction opening, so that the electromagnetic field leaks in a large range, and the part actually participating in the magnetic field is less. In addition, in fig. 5, the end face of the magnetic generating element has more sufficient electromagnetic field action with the other pole of the end of the column, which is far greater than that of fig. 6 and 7.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (14)
1. A sound generator comprising a housing (1) having an installation cavity, and a diaphragm mechanism (2) disposed in the installation cavity, the diaphragm mechanism (2) dividing the installation cavity into a first cavity (104) and a second cavity (105) side by side; characterized by further comprising:
A limiting assembly (3) made of soft magnetic materials, wherein the limiting assembly (3) is provided with a closed cavity (301), one side of the closed cavity (301) facing the vibrating diaphragm mechanism (2) is provided with an opening, and the opening is bent from outside to inside to form a contraction opening (304);
-an electromagnetic member (4) located within said second cavity (105) and mounted within said closed cavity (301) for generating an electromagnetic field and transmitting it to said confinement assembly (3);
and the magnetic generating piece (5) is fixed on the vibrating diaphragm mechanism (2) and extends into the contraction opening (304) to provide a fixed magnetic field.
2. The sound generator according to claim 1, characterized in that the limiting assembly (3) comprises a hollow cylinder (302), the surface of the hollow cylinder (302) facing the vibrating diaphragm mechanism (2) is provided with the contraction opening (304); and a cylinder (303) disposed within the hollow cylinder (302);
The electromagnetic field generated by the electromagnetic member (4) is transmitted to the hollow cylinder (302) through the cylinder (303).
3. The sound generator according to claim 2, characterized in that the hollow cylinder (302) comprises a cylinder body (3021) having the opening near one side of the diaphragm mechanism (2), and a cover (3022) fixed on the opening, the constriction opening (304) being provided on the cover (3022); or alternatively
The hollow cylinder body (302) comprises a cylinder body (3021) with an opening far away from one side of the vibrating diaphragm mechanism (2), and a cover body (3022) fixed on the opening, and the contraction opening (304) is formed in the wall surface, close to one side of the vibrating diaphragm mechanism (2), of the cylinder body (3021).
4. A sound generator according to claim 3, characterized in that the housing (1) comprises a first housing (102) and a second housing (103), the first housing (102) and the second housing (103) being snapped together to enclose the mounting cavity; the second housing (103) serves as the cartridge body (3021).
5. The sound generator according to claim 4, characterized in that the wall thickness of the second housing (103) is larger than the wall thickness of the first housing (102).
6. The sound generator of claim 2 wherein the hollow cylinder (302) is mounted in the second cavity (105) of the housing.
7. The sound generator according to any one of claims 1-6, wherein the proportional relationship between the wall thickness H of the wall surface where the constriction (304) is located and the thickness H of the magnetic generating member (5) is: h is 7H/6 or more.
8. The sound generator according to any one of claims 1-6, characterized in that the magnetic generating member (5) is a permanent magnet, the outer circumferential surface of which is a smooth arc surface.
9. The sound generator of claim 8 wherein the permanent magnet is cylindrical and the ratio of the diameter D of the permanent magnet to the thickness H thereof is: D/H is more than 0 and less than or equal to 2.5, and the magnetic field distribution of the axial end face of the permanent magnet is mushroom head-shaped.
10. The sound generator according to any one of claims 2-6, characterized in that the electromagnetic member (4) is a coil which is fitted over the cylinder (303) and is located within the hollow cylinder (302).
11. The sound generator of any one of claims 1-6, 9 wherein,
An auxiliary magnetizer (6) is arranged on the end face of one side, facing away from the vibrating diaphragm mechanism (2), of the magnetic generating piece (5), so that an electromagnetic loop is formed between the electromagnetic field on the limiting assembly (3) and the auxiliary magnetizer (6).
12. The sound generator of any one of claims 1-6, 9, further comprising:
An auxiliary permanent magnet (7) disposed within the first cavity (104) opposite the magnetic generating element (5); the polarity of one end of the auxiliary permanent magnet (7) and the polarity of the other end of the magnetic generating piece (5) facing each other are opposite;
The magnetic field intensity of the auxiliary permanent magnet (7) is smaller than the magnetic field intensity of the electromagnetic field generated by the electromagnetic piece (4).
13. The sound generator according to any one of claims 1-6, 9, wherein the diaphragm mechanism (2) comprises:
an elastic vibration plate (201) fixed to the inner wall surface of the housing (1);
And a sound producing film (202) which covers one side surface of the elastic vibration plate (201).
14. The sound generator of any one of claims 1-6, 9 wherein the sound generator is a receiver.
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| CN201810438332.6A CN108347680B (en) | 2018-05-09 | 2018-05-09 | Acoustic generator |
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| CN201810438332.6A CN108347680B (en) | 2018-05-09 | 2018-05-09 | Acoustic generator |
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| CN108347680B true CN108347680B (en) | 2024-05-28 |
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| CN109413542B (en) * | 2018-11-21 | 2024-07-16 | 南京常荣声学股份有限公司 | Low-frequency high-power underwater sound generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10301573A (en) * | 1997-04-22 | 1998-11-13 | Tokin Corp | Electromagnetic sounder |
| CN107404678A (en) * | 2017-07-26 | 2017-11-28 | 苏州逸巛声学科技有限公司 | A kind of receiver and its assembly technology |
| CN107484089A (en) * | 2017-07-26 | 2017-12-15 | 苏州逸巛声学科技有限公司 | A kind of receiver and its assembly technology |
| CN208540161U (en) * | 2018-05-09 | 2019-02-22 | 苏州逸巛声学科技有限公司 | A kind of acoustical generator |
-
2018
- 2018-05-09 CN CN201810438332.6A patent/CN108347680B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10301573A (en) * | 1997-04-22 | 1998-11-13 | Tokin Corp | Electromagnetic sounder |
| CN107404678A (en) * | 2017-07-26 | 2017-11-28 | 苏州逸巛声学科技有限公司 | A kind of receiver and its assembly technology |
| CN107484089A (en) * | 2017-07-26 | 2017-12-15 | 苏州逸巛声学科技有限公司 | A kind of receiver and its assembly technology |
| CN208540161U (en) * | 2018-05-09 | 2019-02-22 | 苏州逸巛声学科技有限公司 | A kind of acoustical generator |
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