CN110149575B - Sounding device - Google Patents
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- CN110149575B CN110149575B CN201910477379.8A CN201910477379A CN110149575B CN 110149575 B CN110149575 B CN 110149575B CN 201910477379 A CN201910477379 A CN 201910477379A CN 110149575 B CN110149575 B CN 110149575B
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- 230000005415 magnetization Effects 0.000 claims description 7
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- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
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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
- H04R9/02—Details
- H04R9/025—Magnetic circuit
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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
- H04R9/06—Loudspeakers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention discloses a sound generating device, wherein a magnetic circuit system comprises a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part, wherein the central magnetic circuit part and the side magnetic circuit part are arranged on the bottom wall of the magnetic yoke, a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part, and the central magnetic circuit part comprises a central magnet and a central magnetic component which are arranged in parallel from bottom to top; the side magnetic circuit part comprises side magnets and side magnetic components which are arranged in parallel from bottom to top; the polarities of the magnetic poles of the center magnet and the side magnet at the end close to the bottom wall of the magnetic yoke are different, and the polarities of the magnetic poles at the end far away from the magnetic yoke are also different; at least one of the center magnetic component and the side magnetic component is a permanent magnet, and the magnetic pole of one end of the permanent magnet close to the magnetic gap is the same as the magnetic pole of one end of the center magnet or the side magnet far away from the bottom wall of the magnetic yoke, which are arranged in parallel. The sound generating device has better acoustic performance.
Description
Technical Field
The invention relates to the technical field of acoustic energy conversion, in particular to a sound generating device.
Background
The miniature sound generating device is an important electroacoustic conversion component in the mobile communication equipment and is used for converting an electric signal into sound and is used for forming parts such as a loudspeaker, a receiver and an earphone of the mobile communication equipment. With the development of the mobile communication equipment industry, the micro sound generating device industry is rapidly developed, and the requirements on the performance of the micro sound generating device are higher and higher.
The moving-coil sound generating device is a specific sound generating device structure widely applied to mobile communication equipment, as shown in fig. 1, the existing moving-coil sound generating device generally comprises a housing, and a vibrating system and a magnetic circuit system which are accommodated and fixed on the housing, wherein the vibrating system comprises a vibrating diaphragm and a voice coil 04, the magnetic circuit system forms a magnetic gap to accommodate the voice coil, after current is introduced into the voice coil, the voice coil is stressed to vibrate under the action of a magnetic field of the magnetic circuit system, and then the vibrating diaphragm is driven to vibrate and generate sound.
In the structure of the existing sound generating device, the magnetic circuit system generally comprises a magnetic yoke 01, a central magnetic circuit part and a side magnetic circuit part, wherein the central magnetic circuit part and the side magnetic circuit part are arranged on the magnetic yoke 01, the central magnetic circuit part comprises a central magnet 021 and a central magnetic conduction plate 022, the side magnetic circuit part comprises a side magnet 031 and a side magnetic conduction plate 032, the central magnet 021 and the side magnet 031 magnetize in the vertical direction, the magnetizing directions of the central magnet 021 and the side magnet 031 are opposite, and the magnetic yoke 01 and the magnetic conduction plate are used for gathering magnetic induction wires generated by the two magnets and guiding the magnetic induction wires to trend, so that the magnetic field intensity in a magnetic gap is enhanced. In combination with the magnetic induction line distribution diagram shown in fig. 2, in the magnetic circuit structure in the prior art, the magnetic circuit of the sounding device is relatively flat, the magnetic short circuit phenomenon easily occurs on the outer side of the side magnet, the driving force factor BL value (the length L of a certain number of turns of a wire is multiplied by the magnetic flux density B of a unit area) is not high, the magnetic field cannot be fully utilized, the sensitivity of the sounding device is not high, and the acoustic performance of the sounding device is affected. In the prior art, when the BL (x) curve symmetry is adjusted, the design cost is increased by means of re-opening the die for designing the height of the magnet and the magnetic conduction plate.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the problem in the prior art is overcome, and the sound generating device with better acoustic performance is provided.
In order to solve the technical problems, the technical scheme of the invention is as follows: the sound generating device comprises a vibration system and a magnetic circuit system, wherein the vibration system comprises a vibrating diaphragm and a voice coil combined with the vibrating diaphragm, the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part which are arranged on the bottom wall of the magnetic yoke, a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part, the voice coil stretches into the magnetic gap,
the central magnetic circuit part comprises a central magnet and a central magnetic component which are arranged in parallel from bottom to top;
the side magnetic circuit part comprises side magnets and side magnetic components which are arranged in parallel from bottom to top;
the polarities of the magnetic poles of the center magnet and the side magnet at the end close to the bottom wall of the magnetic yoke are different, and the polarities of the magnetic poles at the end far away from the magnetic yoke are also different;
at least one of the center magnetic component and the side magnetic component is a permanent magnet, and the magnetic pole of one end of the permanent magnet close to the magnetic gap is the same as the magnetic pole of one end of the center magnet or the side magnet far away from the bottom wall of the magnetic yoke, which are arranged in parallel.
As a preferred technical solution, the central magnet is rectangular, and the central magnet includes two opposite first sides and two opposite second sides;
the side magnetic circuit part comprises two side magnets and two side magnetic components which are positioned outside two first sides of the center magnet; alternatively, the side magnetic path portion includes four side magnets and four side magnetic members located outside the two first sides and the two second sides of the center magnet.
As a preferable technical scheme, the magnetizing directions of the center magnet and the side magnets are parallel to the vibrating direction of the vibrating diaphragm, and the magnetizing direction of the permanent magnet is perpendicular to the vibrating direction of the vibrating diaphragm.
As a preferable technical scheme, the central magnetic component is a permanent magnet, and the side magnetic component is a magnetizer;
the central magnetic component comprises at least two first magnets corresponding to two first sides of the central magnet, and the two first magnets are arranged at intervals.
As a preferable technical scheme, the central magnetic component comprises four first magnets corresponding to two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
the side magnetic circuit part comprises two side magnets and two second magnetizers, wherein the two side magnets and the two second magnetizers are positioned on the outer sides of two first sides of the center magnet, and the two second magnetizers are of mutually independent structures or are connected into an integrated structure through a connecting part; or the side magnetic circuit part comprises four side magnets and four second magnetizers which are positioned at the outer sides of the two first sides and the two second sides of the central magnet, and the four second magnetizers are of mutually independent structures or are connected into an integrated structure through connecting parts.
As a preferred technical solution, each first magnet includes a rectangular portion disposed close to the magnetic gap and a trapezoidal portion disposed away from the magnetic gap, the trapezoidal portion includes two oblique sides, and the oblique sides of the trapezoidal portions of two adjacent first magnets are disposed opposite to each other and at intervals.
As a preferable technical scheme, the central magnetic component is a first magnetizer, and the side magnetic components are permanent magnets;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
As a preferable technical scheme, the central magnetic component is a permanent magnet, and the side magnetic components are permanent magnets;
the central magnetic component comprises two first magnets corresponding to two first sides of the central magnet, wherein the two first magnets are arranged at intervals, or four first magnets corresponding to the two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
As a preferable technical scheme, the central magnetic component is a permanent magnet, and the side magnetic components are permanent magnets;
the magnetizing directions of the center magnet and the side magnets are in an inclined direction relative to the vibrating direction of the vibrating diaphragm, a first included angle is formed between the magnetizing directions of the center magnet and the side magnets, and the opening direction of the first included angle is away from the bottom wall of the magnetic yoke;
the magnetizing directions of the central magnetic component and the side magnetic components are in an inclined direction relative to the plane where the bottom wall of the magnetic yoke is located, a second included angle is formed between the magnetizing directions of the central magnetic component and the side magnetic components, and the opening direction of the second included angle faces the bottom wall of the magnetic yoke.
As a preferable technical scheme, the magnetizing directions of the center magnet and the side magnets are inclined at an angle of 0 ° or more and 45 ° or less with respect to the vibration direction of the diaphragm;
the magnetizing directions of the central magnetic component and the side magnetic components are inclined at an angle of more than 0 degrees and less than or equal to 45 degrees relative to the plane where the bottom wall of the magnetic conducting yoke is located.
As a preferable embodiment, the central magnetic member includes two first magnets corresponding to two first sides of the central magnet, the two first magnets being spaced apart from each other, or includes four first magnets corresponding to two first sides and two second sides of the central magnet, the four first magnets being spaced apart from each other;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
As a preferable technical solution, the two first sides of the center magnet are long sides, and the two second sides are short sides.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the sounding device, the permanent magnets are additionally arranged on the central magnet and/or the side magnets, so that the magnetic short circuit phenomenon of the side magnetic circuit part can be reduced, the magnetic field intensity in the magnetic gap is enhanced, the BL value is improved, the magnetic field driving force is improved, and the acoustic sensitivity is improved.
Further, the magnetizing directions of the center magnet and the side magnets may be parallel to the vibrating direction of the vibrating diaphragm, and the magnetizing direction of the permanent magnet may be perpendicular to the vibrating direction of the vibrating diaphragm. Or the permanent magnets, even the magnetizing directions of the center magnet and the side magnets are obliquely arranged on the basis of the directions, and the symmetry of BL (x) is improved through the deflection of the magnetizing directions so as to reduce distortion.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a prior art sound generating apparatus structure.
FIG. 2 is a diagram showing a magnetic induction line distribution of a magnetic circuit system of a sound generating device in the prior art;
FIG. 3 is a schematic cross-sectional view of a sound generating apparatus according to a first embodiment of the present invention;
FIG. 4 is an exploded view of the sound emitting device of FIG. 3;
FIG. 5 is a diagram showing a magnetic induction line distribution of the magnetic circuit system of the sound generating apparatus of FIG. 3;
FIG. 6 is a BL (X) curve comparison diagram of the sound generating device of the present invention and the sound generating device of the prior art;
FIG. 7 is a schematic cross-sectional view of a sound generating apparatus according to a second embodiment of the present invention;
FIG. 8 is an exploded view of the sound emitting device of FIG. 7;
FIG. 9 is a top plan view of the sound emitting apparatus of FIG. 7;
FIG. 10 is a diagram showing a magnetic induction line distribution of the magnetic circuit of the sound generating apparatus of FIG. 7;
FIG. 11 is a schematic cross-sectional view of three sound emitting devices according to an embodiment of the present invention;
FIG. 12 is a diagram showing a magnetic induction line distribution of the magnetic circuit system of the sound generating apparatus of FIG. 11;
FIG. 13 is an exploded view of the sound emitting device of FIG. 11;
FIG. 14 is a schematic cross-sectional view of a sound emitting device according to a fourth embodiment of the present invention;
fig. 15 is a diagram showing a magnetic induction line distribution of the magnetic circuit system of the sound generating apparatus in fig. 14.
Fig. 16 is a BL (X) graph of the sound emitting device of fig. 14.
Reference numerals illustrate:
1. a magnetic yoke, 21, a central magnet, 22, a first magnetizer, 23, a first magnet, 31, a side magnet, 32, a second magnetizer, 33, a second magnet, 4, a voice coil, A, BL curve of the sounding device in the prior art, B, BL curve of the sounding device in fig. 3, C, BL curve of the sounding device in fig. 7, D, BL curve of the sounding device in fig. 11, E, BL curve of the sounding device in fig. 14.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Embodiment one:
the invention provides a sound generating device which can be used in electronic equipment such as headphones and mobile phones capable of generating sound.
Please combine to refer to fig. 3 and fig. 4 to show, sound generating mechanism specifically includes vibration system and magnetic circuit, vibration system include the vibrating diaphragm and with voice coil loudspeaker voice coil 4 that the vibrating diaphragm combines, magnetic circuit includes magnetic yoke 1 and locates center magnetic circuit part and limit magnetic circuit part on the diapire of magnetic yoke 1, center magnetic circuit part with form the magnetic gap between the limit magnetic circuit part, voice coil loudspeaker voice coil 4 stretches into in the magnetic gap, after letting in electric current in the voice coil loudspeaker voice coil 4, voice coil loudspeaker voice coil 4 atress vibration under the effect of magnetic field of magnetic circuit, and then drive vibrating diaphragm vibration sound production.
Wherein the central magnetic circuit part comprises a central magnet 21 and a central magnetic component which are arranged in parallel from bottom to top; the side magnetic circuit portion includes side magnets 31 and side magnetic members arranged side by side from bottom to top. The polarities of the magnetic poles of the center magnet 21 and the side magnet 31 at the end close to the bottom wall of the magnetic yoke 1 are different, and the polarities of the magnetic poles at the end far from the magnetic yoke 1 are also different; at least one of the center magnetic member and the side magnetic member is a permanent magnet, and a magnetic pole of one end of the permanent magnet close to the magnetic gap is the same as a magnetic pole of one end of the center magnet 21 or the side magnet 31, which is arranged in parallel and is away from the bottom wall of the magnetic yoke 1. The central magnetic component or the side magnetic component adopts a magnetizer under the condition that a permanent magnet is not adopted, and cannot form a magnetic field, so that the magnetic induction coil can only be used for gathering magnetic induction wires and restraining the trend of the magnetic induction wires, and the magnetic induction wire density passing through the voice coil 4 is enhanced.
In the sounding device of the present embodiment, by adding permanent magnets to the center magnet 21 and/or the side magnet 31, not only the magnetic short circuit phenomenon of the side magnetic circuit portion can be reduced, the magnetic field strength in the magnetic gap can be enhanced, the BL value can be increased, and the magnetic field driving force can be increased to increase the acoustic sensitivity.
The central magnet 21 is rectangular, and the central magnet 21 includes two opposite first sides and two opposite second sides, specifically, the two first sides are preferably long sides of the central magnet 21, and the two second sides are short sides of the central magnet 21.
The side magnetic circuit part includes two side magnets 31 and two side magnetic members located outside two first sides of the center magnet 21; alternatively, the side magnetic path portion includes four side magnets 31 and four side magnetic members located outside the two first sides and the two second sides of the center magnet 21. Side magnets 31 are preferably provided on the long sides of the center magnet 21, so that the volume of the permanent magnet can be increased, and the magnetic field strength of the magnetic circuit system can be increased as much as possible. Specifically, in the present embodiment, in the case where the preset size of the sound generating apparatus is sufficiently large, the side magnetic circuit member includes four side magnets 31 and four side magnetic members located outside the two first sides and the two second sides of the center magnet 21, and one side magnetic member and one side magnet 31 are provided in a vertically aligned manner corresponding to each side of the center magnet 21.
In this embodiment, referring to fig. 3, the arrow direction is the magnetizing direction, the magnetizing directions of the center magnet 21 and the side magnet 31 are parallel to the vibrating direction of the vibrating diaphragm, the magnetizing directions of the permanent magnets are perpendicular to the vibrating direction of the vibrating diaphragm, and according to the position state of the sound generating device shown in fig. 3, it can be also understood that the magnetizing directions of the center magnet 21 and the side magnet 31 are vertical directions, and the magnetizing directions of the permanent magnets are horizontal directions. Wherein the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite.
In this embodiment, as shown in fig. 3 and fig. 4, the central magnetic component is a first magnetizer 22 disposed on the central magnet 21, and the side magnetic component adopts a permanent magnet. Specifically, the side magnetic path portion includes four side magnets 31 and four second magnets 33 located outside the two first sides and the two second sides of the center magnet 21, and one second magnet 33 and one side magnet 31 arranged up and down are provided corresponding to each side of the center magnet 21. The four second magnets 33 are arranged at intervals, so that the magnetizing process is simple on one hand, gaps are formed between the four second magnets 33 on the other hand, a channel structure for communicating the inside and the outside of the sound production device is formed, the vibration smoothness of the vibrating diaphragm is facilitated, the gaps at the corners can provide accommodating spaces for bending sections of voice coil leads, and the voice coil leads do not need to be reserved with spaces in the transverse direction or the longitudinal direction independently.
In other embodiments, when the preset size of the sound generating device is small, only when two side magnets 31 are disposed outside two first sides of the center magnet 21, two second magnets 33 are disposed on the two side magnets 31, and the side portions of the magnetic yoke 1 are disposed outside the two second sides of the center magnet 21, so that a magnetic gap is formed between the bent side walls and the center magnetic circuit portion.
Specifically, referring to the magnetic pole marks of the magnets in fig. 3, the magnetic pole of the end of the second magnet 33 close to the magnetic gap is the same as the magnetic pole of the end of the side magnet 31, which is arranged in parallel, and is far away from the bottom wall of the magnetic yoke 1, and the magnetic pole of the end of the second magnet 33, which is far away from the magnetic gap, is the same as the magnetic pole of the end of the side magnet 31, which is arranged in parallel, and is close to the bottom wall of the magnetic yoke 1.
In this embodiment, by additionally providing the second magnet 33 perpendicular to the magnetizing direction of the side magnet 31 above the side magnet 31 that is magnetized vertically, the flowing direction of the magnetic induction lines can be limited, the magnetic induction line density of the magnetic gap can be increased, and the magnetic short circuit phenomenon of the side magnetic circuit portion can be reduced, fig. 5 is a magnetic induction line distribution diagram of the magnetic circuit system in this embodiment, fig. 2 is a magnetic induction line distribution diagram of the magnetic circuit system in the prior art, and in this embodiment, the magnetic induction line flowing density in the second magnet 33 is increased, the magnetic induction line density of the magnetic gap is increased, and the magnetic short circuit phenomenon of the side magnetic circuit portion in this embodiment is significantly improved, as compared with the side magnetic conduction plate in the prior art, as shown in fig. 5 and 2. Further referring to fig. 6 and table 1 below, simulation results show that, in this embodiment, the BL value of the sound generating apparatus is greatly improved compared with the prior art, in fig. 6, curve B is the BL curve of the sound generating apparatus of this embodiment, curve a is the BL curve of the sound generating apparatus of the prior art, when no current is introduced into the voice coil 4, the BL value of the sound generating apparatus of the prior art is 0.78, and the BL value of the sound generating apparatus of this embodiment is improved to 0.86, which is obvious that the magnetic field driving force in this embodiment is higher, the acoustic sensitivity of the sound generating apparatus is higher, and the acoustic performance is better.
TABLE 1
Embodiment two:
referring to fig. 7, 8 and 9, the sound generating apparatus in the present embodiment is different from the first embodiment in that: in this embodiment, the central magnetic component is a permanent magnet, and the side magnetic components are magnetizers.
In this embodiment, referring to fig. 7, the arrow direction is the magnetizing direction, the magnetizing directions of the center magnet 21 and the side magnet 31 are parallel to the vibrating direction of the vibrating diaphragm, the magnetizing directions of the permanent magnets are perpendicular to the vibrating direction of the vibrating diaphragm, and according to the position state of the sound generating device shown in fig. 7, it can be understood that the magnetizing directions of the center magnet 21 and the side magnet 31 are vertical directions, and the magnetizing directions of the permanent magnets are horizontal directions. Wherein the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite.
Wherein the central magnetic member includes at least two first magnets 23 corresponding to two first sides of the central magnet 21, and the two first magnets 23 are spaced apart from each other. As a specific embodiment, the central magnetic member includes four first magnets 23 corresponding to two first sides and two second sides of the central magnet 21, the four first magnets 23 are disposed at intervals from each other, and one side edge of the four first magnets 23 near the magnetic gap is aligned with an edge of the central magnet 21. The design of two first magnets 23 or the design of four first magnets 23 is adopted, the magnetizing process is simple, and the reliability of the magnets is high.
Specifically, referring to the magnetic pole marks of the magnets in fig. 7, the magnetic pole of the first magnet 23 at the end close to the magnetic gap is the same as the magnetic pole of the side-by-side center magnet 21 at the end far from the bottom wall of the magnetic yoke 1, and the magnetic pole of the first magnet 23 at the end far from the magnetic gap is the same as the magnetic pole of the side-by-side center magnet 21 at the end close to the bottom wall of the magnetic yoke 1.
Further, as shown in fig. 9, each of the first magnets 23 includes a rectangular portion 231 disposed close to the magnetic gap and a trapezoidal portion 232 disposed away from the magnetic gap, the trapezoidal portion 232 includes two oblique sides, and the oblique sides of the trapezoidal portions 232 of two adjacent first magnets 23 are disposed opposite to each other and at a distance from each other. This design increases the volume of the first magnet 23 as much as possible and facilitates positioning of the first magnet 23 during assembly and assembly with other parts.
Specifically, the side magnetic circuit portion includes two side magnets 31 and two second magnetic conductors 32 located outside two first sides of the center magnet 21, where the two second magnetic conductors 32 are independent from each other, or the two second magnetic conductors 32 are connected into an integral structure through a connecting portion; alternatively, the side magnetic circuit part includes four side magnets 31 and four second magnetic conductors 32 located outside the two first sides and the two second sides of the center magnet 21, and the four second magnetic conductors 32 are independent from each other, or the four second magnetic conductors 32 are connected as an integral structure through a connecting portion. When the two or four second magnetizers 32 are connected into an integrated structure, a notch is reserved at the position corresponding to the bending section of the voice coil lead wire and is used for accommodating the bending section; and the design of integral structure makes things convenient for second magnetizer 32 and sound generating mechanism's shell to assemble, can be through once fixing a position, combines four second magnetizers 32 and shell to mould plastics for example.
In this embodiment, by additionally arranging the first magnet 23 perpendicular to the magnetizing direction of the center magnet 21 above the vertically magnetized center magnet 21, the flowing direction of the magnetic induction lines can be limited, the magnetic induction line density of the magnetic gap can be increased, fig. 10 is a magnetic induction line distribution diagram of the magnetic circuit system in this embodiment, fig. 2 is a magnetic induction line distribution diagram of the magnetic circuit system in the prior art, and in this embodiment, the magnetic induction line flowing density in the first magnet 23 is increased and the magnetic induction line density of the magnetic gap portion in this embodiment is significantly increased compared to the center magnetic conduction plate in the prior art, as shown in fig. 10 and 2. Further referring to fig. 6 and table 1 above, simulation results show that, in this embodiment, the BL value of the sound generating apparatus is greatly improved compared with the prior art, in fig. 6, curve C is the BL curve of the sound generating apparatus of this embodiment, curve a is the BL curve of the sound generating apparatus of the prior art, when no current is introduced into the voice coil 4, the BL value of the sound generating apparatus of the prior art is 0.78, and the BL value of the sound generating apparatus of this embodiment is improved to 0.85, which is obvious that the magnetic field driving force in this embodiment is higher, the acoustic sensitivity of the sound generating apparatus is higher, and the acoustic performance is better.
Embodiment III:
referring to fig. 11 and 13 in combination, the sound generating apparatus in the present embodiment is different from the first embodiment in that: in this embodiment, the central magnetic component is a permanent magnet, and the side magnetic components are permanent magnets.
In this embodiment, referring to fig. 11, the arrow direction is the magnetizing direction, the magnetizing directions of the center magnet 21 and the side magnet 31 are parallel to the vibrating direction of the vibrating diaphragm, the magnetizing directions of the permanent magnets are perpendicular to the vibrating direction of the vibrating diaphragm, and according to the position state of the sound generating device shown in fig. 11, it can be understood that the magnetizing directions of the center magnet 21 and the side magnet 31 are vertical directions, and the magnetizing directions of the permanent magnets are horizontal directions. Wherein the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite.
Specifically, referring to the magnetic pole marks of the magnets in fig. 11, the magnetic pole of the first magnet 23 at the end close to the magnetic gap is the same as the magnetic pole of the side-by-side center magnet 21 at the end far from the bottom wall of the magnetic yoke 1, and the magnetic pole of the first magnet 23 at the end far from the magnetic gap is the same as the magnetic pole of the side-by-side center magnet 21 at the end close to the bottom wall of the magnetic yoke 1. The magnetic pole of the end of the second magnet 33 close to the magnetic gap is the same as the magnetic pole of the end of the side magnet 31 which is arranged in parallel and is far away from the bottom wall of the magnetic yoke 1, and the magnetic pole of the end of the second magnet 33 which is far away from the magnetic gap is the same as the magnetic pole of the end of the side magnet 31 which is arranged in parallel and is near to the bottom wall of the magnetic yoke 1.
Specifically, the central magnetic member includes two first magnets 23 corresponding to two first sides of the central magnet 21, the two first magnets 23 being spaced apart from each other, or four first magnets 23 corresponding to two first sides and two second sides of the central magnet 21, the four first magnets 23 being spaced apart from each other. Wherein the edge of the first magnet 23 on the side close to the magnetic gap is aligned with the edge of the center magnet 21. The design of two first magnets 23 or the design of four first magnets 23 is adopted, the magnetizing process is simple, and the reliability of the magnets is high.
Further, as shown in fig. 13, each of the first magnets 23 includes a rectangular portion disposed close to the magnetic gap and a trapezoidal portion disposed away from the magnetic gap, the trapezoidal portion including two oblique sides, the oblique sides of the trapezoidal portions of two adjacent first magnets 23 being disposed opposite to and spaced apart from each other. This design increases the volume of the first magnet 23 as much as possible and facilitates positioning of the first magnet 23 during assembly and assembly with other parts.
Specifically, the side magnetic circuit portion includes two side magnets 31 and two second magnets 33 located outside the two first sides of the center magnet 21; alternatively, the side magnetic path portion includes four side magnets 31 and four second magnets 33 located outside the two first sides and the two second sides of the center magnet 21. The two second magnets 33 are arranged at intervals, or the four second magnets 33 are arranged at intervals, so that on one hand, the magnetizing process is simple, on the other hand, gaps are formed between the four second magnets 33 and used for forming a channel structure for communicating the inside and the outside of the sound production device, the vibration smoothness of the vibrating diaphragm is facilitated, the gaps at the corners can provide accommodating spaces for bending sections of voice coil leads, and no space in the transverse direction or the longitudinal direction is required to be reserved for the voice coil leads independently.
In this embodiment, by additionally providing the first magnet 23 perpendicular to the magnetizing direction of the center magnet 21 above the center magnet 21 that is vertically magnetized and additionally providing the second magnet 33 perpendicular to the magnetizing direction of the side magnet 31 above the side magnet 31 that is vertically magnetized, the flow direction of the magnetic induction lines can be limited, the magnetic induction line density of the magnetic gap can be increased, the magnetic short circuit phenomenon of the side magnetic circuit portion can be alleviated, fig. 12 is a magnetic induction line distribution diagram of the magnetic circuit system in this embodiment, fig. 2 is a magnetic induction line distribution diagram of the magnetic circuit system in the prior art, and in this embodiment, the magnetic induction line density of the magnetic gap is increased and the magnetic short circuit phenomenon of the side magnetic circuit portion is significantly improved as compared with the center magnetic conductive plate and the side magnetic conductive plate in the prior art, as shown in fig. 12 and fig. 2. Further referring to fig. 6 and table 1 below, simulation results show that, in this embodiment, the BL value of the sound generating apparatus is greatly improved compared with the prior art, in fig. 6, curve D is the BL curve of the sound generating apparatus of this embodiment, curve a is the BL curve of the sound generating apparatus of the prior art, when no current is introduced into the voice coil 4, the BL value of the sound generating apparatus of this embodiment is 0.78, and the BL value of the sound generating apparatus of this embodiment is improved to 0.88, which is obvious that the magnetic field driving force in this embodiment is higher, the acoustic sensitivity of the sound generating apparatus is higher, and the acoustic performance is better.
Embodiment four:
referring to fig. 14 in combination, the sound generating apparatus in the present embodiment is different from the third embodiment in that: in this embodiment, the central magnetic component and the side magnetic component are both permanent magnets, and are located at two sides of the magnetic gap in combination with the magnetizing direction indicated by the arrow direction in fig. 14, the magnetizing directions of the central magnet 21 and the side magnet 31 are in a direction inclined relative to the vibrating direction of the vibrating diaphragm, the magnetizing direction of the central magnet 21 and the magnetizing direction of the side magnet 31 form a first included angle, and the opening direction of the first included angle is away from the bottom wall of the magnetic yoke 1; the magnetizing directions of the central magnetic component and the side magnetic components are in an inclined direction relative to the plane where the bottom wall of the magnetic yoke 1 is located, a second included angle is formed between the magnetizing directions of the central magnetic component and the side magnetic components, and the opening direction of the second included angle faces the bottom wall of the magnetic yoke 1.
According to the position state of the sound generating device shown in fig. 14, it is also understood that an included angle is formed between the magnetizing directions of the center magnet 21 and the side magnet 31 and the vertical direction, and an included angle is formed between the magnetizing directions of the center magnetic member and the side magnetic member and the horizontal direction.
Specifically, the magnetizing directions of the center magnet 21 and the side magnets 31 are inclined at an angle of 0 ° or more and 45 ° or less with respect to the vibration direction of the diaphragm; the magnetizing directions of the central magnetic component and the side magnetic components are inclined at an angle of more than 0 degrees and less than or equal to 45 degrees relative to the plane where the bottom wall of the magnetic conducting yoke 1 is located.
As a specific embodiment, the magnetizing directions of the center magnet 21 and the side magnets 31 are parallel to the vibrating direction of the diaphragm, that is, in the vertical direction, and the magnetizing directions of the center magnet 21 and the side magnets 31 are opposite. The magnetizing directions of the center magnetic member and the side magnetic members are inclined at an angle of 0 ° or more and 45 ° or less with respect to the plane in which the bottom wall of the magnetic yoke 1 is located. Alternatively, as another specific embodiment, the center magnet 21 is parallel to the vibration direction of the diaphragm, that is, in the vertical direction, the magnetization direction of the side magnet 31 is inclined at an angle of greater than 0 ° and equal to or less than 45 ° with respect to the vibration direction of the diaphragm, and the magnetization directions of the center magnetic member and the side magnetic member are inclined at an angle of greater than 0 ° and equal to or less than 45 ° with respect to the plane in which the bottom wall of the magnetic yoke 1 is located.
Specifically, in this embodiment, the central magnetic member includes two first magnets 23 corresponding to two first sides of the central magnet 21, the two first magnets 23 are spaced apart from each other, or includes four first magnets 23 corresponding to two first sides and two second sides of the central magnet 21, the four first magnets 23 are spaced apart from each other, wherein an edge of the first magnet 23 near the magnetic gap is aligned with an edge of the central magnet 21. The design of two first magnets 23 or the design of four first magnets 23 is adopted, the magnetizing process is simple, and the reliability of the magnets is high.
The side magnetic circuit portion includes two side magnets 31 and two second magnets 33 located outside the two first sides of the center magnet 21; alternatively, the side magnetic path portion includes four side magnets 31 and four second magnets 33 located outside the two first sides and the two second sides of the center magnet 21. The two second magnets 33 are arranged at intervals, or the four second magnets 33 are arranged at intervals, so that on one hand, the magnetizing process is simple, on the other hand, gaps are formed between the four second magnets 33 and used for forming a channel structure for communicating the inside and the outside of the sound production device, the vibration smoothness of the vibrating diaphragm is facilitated, the gaps at the corners can provide accommodating spaces for bending sections of voice coil leads, and no space in the transverse direction or the longitudinal direction is required to be reserved for the voice coil leads independently.
In this embodiment, by adding the first magnet 23 that is obliquely magnetized with respect to the horizontal direction above the center magnet 21 that is vertically magnetized or obliquely magnetized with respect to the vertical direction and adding the second magnet 33 that is obliquely magnetized with respect to the horizontal direction above the side magnet 31 that is vertically magnetized or obliquely magnetized with respect to the vertical direction, the flow direction of the magnetic induction lines can be restricted, the magnetic induction line density distribution in the magnetic gap can be adjusted, the magnetic induction line distribution of the side magnetic circuit portion can be reduced, and the magnetic short circuit phenomenon of the magnetic circuit portion in this embodiment is alleviated, and fig. 15 is a magnetic induction line distribution diagram of the magnetic circuit system in this embodiment, and fig. 2 is a magnetic induction line distribution diagram of the magnetic circuit system in the prior art, as shown in fig. 15 and fig. 2, the magnetic induction line flow densities in the first magnet 23 and the second magnet 33 are increased, the magnetic induction line density distribution in the magnetic gap is changed, and the magnetic short circuit phenomenon of the side magnetic circuit portion in this embodiment is significantly improved, as compared to the center magnetically conductive plate and the side magnetically conductive plate in the prior art. Further referring to fig. 6 and table 1 below, simulation results show that, in this embodiment, the BL value of the sound generating apparatus is greatly improved compared with the prior art, in fig. 6, curve E is the BL curve of the sound generating apparatus of this embodiment, curve a is the BL curve of the sound generating apparatus of the prior art, when no current is introduced into the voice coil 4, the BL value of the sound generating apparatus of this embodiment is 0.78, and the BL value of the sound generating apparatus of this embodiment is improved to 0.88, which is obvious that the magnetic field driving force in this embodiment is higher, the acoustic sensitivity of the sound generating apparatus is higher, and the acoustic performance is better.
And referring to fig. 16 in combination, curves E1, E2, E3, E4 are four BL curves obtained by adjusting the magnetization direction of at least one of the center magnet 21, the side magnet 31, the first magnet 23, and the second magnet 33, curve a is a BL curve of a prior art sound emitting device, and it is understood by comparison that, within the range of the set angle of the magnetization direction specified in the present embodiment, by changing the magnetization direction, the symmetry of the BL curve can be adjusted to be equal to the stiffness K of the vibration system when the BL value is increased as compared with the prior art MS And the curves are matched, so that the distortion phenomenon is improved, and the acoustic performance of the sounding device is improved. Compared with the prior art, the method for adjusting the magnetization direction and further adjusting the BL curve symmetry is simple in process and greatly reduces the production cost by changing the voice coil structure or changing the whole magnetic circuit structure.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).
Claims (12)
1. The utility model provides a sound generating device, includes vibration system and magnetic circuit, vibration system include the vibrating diaphragm and with the voice coil loudspeaker voice coil of vibrating diaphragm combination, magnetic circuit includes the magnetic yoke and locates center magnetic circuit part and limit magnetic circuit part on the diapire of magnetic yoke, center magnetic circuit part with form magnetic gap between the limit magnetic circuit part, the voice coil loudspeaker voice coil stretches into in the magnetic gap, its characterized in that:
the central magnetic circuit part comprises a central magnet and a central magnetic component which are arranged in parallel from bottom to top;
the side magnetic circuit part comprises side magnets and side magnetic components which are arranged in parallel from bottom to top;
the polarities of the magnetic poles of the center magnet and the side magnet at the end close to the bottom wall of the magnetic yoke are different, and the polarities of the magnetic poles at the end far away from the magnetic yoke are also different;
at least one of the center magnetic component and the side magnetic component is a permanent magnet, and the magnetic pole of one end of the permanent magnet close to the magnetic gap is the same as the magnetic pole of one end of the center magnet or the side magnet far away from the bottom wall of the magnetic yoke, which are arranged in parallel.
2. The sound generating apparatus of claim 1, wherein the center magnet is rectangular, the center magnet including two opposing first sides and two opposing second sides;
the side magnetic circuit part comprises two side magnets and two side magnetic components which are positioned outside two first sides of the center magnet; alternatively, the side magnetic path portion includes four side magnets and four side magnetic members located outside the two first sides and the two second sides of the center magnet.
3. The sound generating apparatus as claimed in claim 2, wherein the magnetizing directions of the center magnet and the side magnets are parallel to the vibrating direction of the diaphragm, and the magnetizing direction of the permanent magnet is perpendicular to the vibrating direction of the diaphragm.
4. A sound generating apparatus according to claim 3, wherein said central magnetic member is a permanent magnet and said side magnetic members are magnetic conductors;
the central magnetic component comprises at least two first magnets corresponding to two first sides of the central magnet, and the two first magnets are arranged at intervals.
5. A sound generating apparatus according to claim 4, wherein,
the central magnetic component comprises four first magnets corresponding to two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
the side magnetic circuit part comprises two side magnets and two second magnetizers, wherein the two side magnets and the two second magnetizers are positioned on the outer sides of two first sides of the center magnet, and the two second magnetizers are of mutually independent structures or are connected into an integrated structure through a connecting part; or the side magnetic circuit part comprises four side magnets and four second magnetizers which are positioned at the outer sides of the two first sides and the two second sides of the central magnet, and the four second magnetizers are of mutually independent structures or are connected into an integrated structure through connecting parts.
6. The sound generating apparatus as recited in claim 5, wherein each of the first magnets comprises a rectangular portion disposed adjacent to the magnetic gap and a trapezoidal portion disposed away from the magnetic gap, the trapezoidal portion comprising two beveled edges, the beveled edges of the trapezoidal portions of adjacent two of the first magnets being disposed opposite and spaced apart.
7. A sound generating apparatus according to claim 3, wherein said central magnetic member is a first magnetic conductor and said side magnetic members are permanent magnets;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
8. A sound generating apparatus according to claim 3, wherein said central magnetic member is a permanent magnet and said side magnetic members are permanent magnets;
the central magnetic component comprises two first magnets corresponding to two first sides of the central magnet, wherein the two first magnets are arranged at intervals, or four first magnets corresponding to the two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
9. The sound generating apparatus of claim 2, wherein the central magnetic member is a permanent magnet and the side magnetic members are permanent magnets;
the magnetizing directions of the center magnet and the side magnets are in an inclined direction relative to the vibrating direction of the vibrating diaphragm, a first included angle is formed between the magnetizing directions of the center magnet and the side magnets, and the opening direction of the first included angle is away from the bottom wall of the magnetic yoke;
the magnetizing directions of the central magnetic component and the side magnetic components are in an inclined direction relative to the plane where the bottom wall of the magnetic yoke is located, a second included angle is formed between the magnetizing directions of the central magnetic component and the side magnetic components, and the opening direction of the second included angle faces the bottom wall of the magnetic yoke.
10. The sound generating apparatus according to claim 9, wherein a magnetization direction of the center magnet and the side magnets is inclined at an angle of 0 ° or more and 45 ° or less with respect to a vibration direction of the diaphragm;
the magnetizing directions of the central magnetic component and the side magnetic components are inclined at an angle of more than 0 degrees and less than or equal to 45 degrees relative to the plane where the bottom wall of the magnetic conducting yoke is located.
11. A sound generating apparatus according to claim 9, wherein,
the central magnetic component comprises two first magnets corresponding to two first sides of the central magnet, wherein the two first magnets are arranged at intervals, or four first magnets corresponding to the two first sides and two second sides of the central magnet, and the four first magnets are arranged at intervals;
the side magnetic circuit part comprises two side magnets and two second magnets positioned outside two first sides of the center magnet; alternatively, the side magnetic circuit portion includes four side magnets and four second magnets located outside the two first sides and the two second sides of the center magnet.
12. A sound generating apparatus according to any one of claims 2 to 11,
the two first sides of the center magnet are long sides, and the two second sides are short sides.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910477379.8A CN110149575B (en) | 2019-06-03 | 2019-06-03 | Sounding device |
| PCT/CN2019/128435 WO2020244208A1 (en) | 2019-06-03 | 2019-12-25 | Sound generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910477379.8A CN110149575B (en) | 2019-06-03 | 2019-06-03 | Sounding device |
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| CN110149575A CN110149575A (en) | 2019-08-20 |
| CN110149575B true CN110149575B (en) | 2024-02-13 |
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| CN201910477379.8A Active CN110149575B (en) | 2019-06-03 | 2019-06-03 | Sounding device |
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| WO (1) | WO2020244208A1 (en) |
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| CN110149575B (en) * | 2019-06-03 | 2024-02-13 | 歌尔股份有限公司 | Sounding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109195079A (en) * | 2018-08-14 | 2019-01-11 | 歌尔股份有限公司 | The assemble method and magnetic charging system of magnetic circuit system |
| CN109587606A (en) * | 2018-11-14 | 2019-04-05 | 歌尔股份有限公司 | A kind of sounding device and electronic equipment |
| CN109788405A (en) * | 2018-12-20 | 2019-05-21 | 歌尔股份有限公司 | A kind of sounding device and assemble method |
| CN209823998U (en) * | 2019-06-03 | 2019-12-20 | 歌尔股份有限公司 | Sound production device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205847557U (en) * | 2016-05-26 | 2016-12-28 | 瑞声声学科技(深圳)有限公司 | Speaker |
| CN205847566U (en) * | 2016-07-01 | 2016-12-28 | 瑞声科技(新加坡)有限公司 | Speaker |
| CN207652688U (en) * | 2017-12-25 | 2018-07-24 | 歌尔科技有限公司 | A kind of acoustical generator |
| CN208462041U (en) * | 2018-08-06 | 2019-02-01 | 歌尔科技有限公司 | Sounding device and electronic equipment |
| CN110149575B (en) * | 2019-06-03 | 2024-02-13 | 歌尔股份有限公司 | Sounding device |
-
2019
- 2019-06-03 CN CN201910477379.8A patent/CN110149575B/en active Active
- 2019-12-25 WO PCT/CN2019/128435 patent/WO2020244208A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109195079A (en) * | 2018-08-14 | 2019-01-11 | 歌尔股份有限公司 | The assemble method and magnetic charging system of magnetic circuit system |
| CN109587606A (en) * | 2018-11-14 | 2019-04-05 | 歌尔股份有限公司 | A kind of sounding device and electronic equipment |
| CN109788405A (en) * | 2018-12-20 | 2019-05-21 | 歌尔股份有限公司 | A kind of sounding device and assemble method |
| CN209823998U (en) * | 2019-06-03 | 2019-12-20 | 歌尔股份有限公司 | Sound production device |
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| CN110149575A (en) | 2019-08-20 |
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