CN212544056U

CN212544056U - Energy converter

Info

Publication number: CN212544056U
Application number: CN202021236017.4U
Authority: CN
Inventors: 顾善勇
Original assignee: KING TONE INNOVATION
Current assignee: KING TONE INNOVATION
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-02-12
Anticipated expiration: 2030-06-29

Abstract

The transducer comprises a magnetic circuit system, a voice coil framework, a basin frame and a suspension, wherein the voice coil framework is made of conductive materials and is arranged in a magnetic field formed by the magnetic circuit system to generate eddy currents inside the voice coil framework, the eddy currents cause electromagnetic damping to the system, the voice coil framework with different shapes and/or materials is used to generate different electromagnetic damping to the system, and then the total damping of the system is adjusted, so that the transducer achieves better signal output quality.

Description

Energy converter

Technical Field

The utility model relates to an electroacoustic conversion technology field, concretely relates to transducer.

Background

With the development of the field of electronic and electric appliances, the electric-acoustic transducer is becoming more and more popular as a device for mutual conversion between electric energy and sound energy, and people have increasingly higher requirements for the quality of sound signals output by the electric-acoustic transducer.

The voice coil framework in the existing electroacoustic transducer is usually made of paper, plastic and other materials. Meanwhile, the electroacoustic transducer still faces the problem of insufficient damping, which results in that the performance output cannot be adjusted in a large range, resulting in a lower quality of the output signal.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a transducer using a voice coil bobbin to adjust damping of a system, so that the output quality of the transducer is improved.

In a first aspect, an embodiment of the present invention provides a transducer, including:

a magnetic circuit system for forming a magnetic field;

a voice coil disposed in a magnetic field formed by the magnetic circuit system and configured to be controlled to vibrate;

the voice coil framework is made of a conductive material and used for fixing the voice coil;

the pot frame is used for fixing the voice coil framework;

a suspension coupled to the voice coil former and configured to be controlled to vibrate;

the shape and/or material of the voice coil former is configured to cause the voice coil former to generate eddy currents for adjusting system damping when the voice coil vibrates.

Further, the voice coil framework is arranged into a closed structure matched with the shape of the voice coil.

Further, the resistance of the voice coil former is set to match the system damping.

Further, the sectional shape of the voice coil bobbin is set so that the voice coil bobbin has a predetermined resistance; and/or

The voice coil bobbin is sized such that the voice coil bobbin has a predetermined resistance; and/or

The material of the voice coil bobbin is set so that the voice coil bobbin has a predetermined resistance.

Further, the voice coil bobbin is provided as a closed metal ring.

Furthermore, the voice coil framework is provided with a groove or a notch for adjusting the resistance of the voice coil framework.

Further, the magnetic circuit system includes:

at least one magnet;

a topsheet;

a yoke;

wherein the magnet, the top piece, and the yoke are configured to together form a magnetic field.

Further, the transducer further comprises:

a connection block for supporting an internal structure of the transducer.

Further, the voice coil is configured as a conductive coil configured to vibrate in a magnetic field of the magnetic circuit system when energized.

Further, the suspension has a hollow structure.

The embodiment of the utility model provides a to set up the voice coil loudspeaker voice coil skeleton of being made by conducting material in the magnetic field that magnetic circuit formed, make the system produce different electromagnetic damping through the voice coil loudspeaker voice coil skeleton that uses different shapes and/or material, and then governing system's total damping reaches more excellent signal output quality.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is an exploded view of a transducer according to a first embodiment of the present invention;

fig. 2 is a cross-sectional view of a transducer according to a first embodiment of the invention;

fig. 3 is a cross-sectional view of a transducer according to a second embodiment of the invention;

fig. 4 is an exploded view of a transducer according to a third embodiment of the present invention;

fig. 5 is a cross-sectional view of a transducer according to a third embodiment of the invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1-2 are schematic views of a transducer according to a first embodiment of the invention. As shown in fig. 1, the transducer according to the present embodiment includes a magnetic circuit system 1, a voice coil 2, a voice coil bobbin 3, a frame 4, and a suspension 5. The magnetic circuit system 1 is used for forming a magnetic field, and the voice coil 2 is fixedly connected with the voice coil framework 3 and both are made of conductive materials. The voice coil 2 is arranged in the magnetic field formed by the magnetic circuit system 1, the voice coil 2 is subjected to an ampere force after being electrified to generate vibration, the voice coil framework 3 is driven to do the same vibration and cut magnetic induction lines of the magnetic field formed by the magnetic circuit system 1, induced current is further generated inside the voice coil framework 3, the induced current inside the voice coil framework 3 excites an induced magnetic field which is opposite to the direction of the magnetic field formed by the magnetic circuit system 1, and the induced magnetic field enables the voice coil framework 3 to be subjected to the ampere force which is opposite to the vibration direction of the voice coil framework, namely electromagnetic damping.

The voice coil framework 3 is set to be a closed structure matched with the shape of the voice coil 2. In the present embodiment, the voice coil 2 is provided as an annular coil, and the voice coil bobbin 3 is provided as a closed metal ring having a shape adapted to the annular shape of the voice coil 2, as shown in fig. 1. Specifically, when an alternating current is applied to the voice coil 2 in the magnetic field formed by the magnetic circuit system 1, the moving charges are subjected to a lorentz force in the magnetic field, which macroscopically represents that the voice coil 2 is subjected to a periodic ampere force in the same direction as the lorentz force applied to the free charges on the voice coil 2, and the direction is determined by the vector cross-product direction of the magnetic field formed by the magnetic circuit system 1 and the direction of the current applied to the voice coil 2. In this embodiment, the direction of the magnetic field formed by the magnetic circuit system 1 is along the axial direction of the voice coil 2, the current direction is along the circumferential direction of the voice coil 2, the direction of the lorentz force applied to any current element in the voice coil 2 is along the radial direction of the voice coil 2, and the ampere force direction applied to the voice coil 2 is the vector sum of the lorentz forces applied to all current elements thereon. The voice coil 2 can correspondingly vibrate after being subjected to the action of periodic ampere force, and the voice coil framework 3 is fixedly connected with the voice coil 2 relatively, so that the voice coil framework 3 is driven by the voice coil 2 to vibrate in the same direction, and the magnetic flux passing through the voice coil framework 3 changes because the vibration direction is vertical to the direction of a magnetic field formed by the magnetic circuit system 1. According to the faraday's law of electromagnetic induction (a change in the magnetic flux of a conductor in a magnetic field will cause an induced current to be generated inside the conductor), an induced current is generated in the voice coil bobbin 3, which is an eddy current along the circumferential direction of the voice coil bobbin 3. According to lenz's law (the induced current always excites the induced magnetic field in the direction of blocking the change of the magnetic flux), the eddy current on the voice coil bobbin 3 generates an induced magnetic field in the direction opposite to the direction of the magnetic field formed by the magnetic circuit system 1, and the induced magnetic field subjects the voice coil bobbin 3 to an ampere force in the direction of the induced magnetic field. The ampere force of the induced magnetic field to the voice coil framework 3 is opposite to the relative motion direction of the magnetic field formed by the magnetic circuit system 1 to the voice coil framework 3, so that the vibration of the voice coil framework 3 is restrained to a certain degree, and further the vibration of the voice coil 2 is driven to be restrained to the same degree, namely, the induced magnetic field enables the vibration of the voice coil 2 to be adjusted to a certain degree. The connection mode of voice coil 2 and voice coil skeleton 3 can be for welding, gluing and buckle connection etc. preferably, can adopt the buckle to connect to simplify process flow and reduce cost.

The degree of adjustment of the voice coil 2 vibration by the voice coil bobbin 3 can be adjusted by changing the resistance R of the voice coil bobbin 3. Specifically, assuming that the electromagnetic damping Re of the system is (Bl)2/R (B is the magnetic field strength, l is the circumferential length of the voice coil bobbin 3, and R is the resistance of the voice coil bobbin 3), the induced electromotive force E generated on the voice coil bobbin 3 after being affected by the magnetic field formed by the magnetic circuit system 1 is Blv (v is the relative speed of vibration of the voice coil bobbin 3), the equivalent eddy current strength i is E/R is Blv/R, and the magnitude of the reverse ampere force is F ═ Bli ═ Re · v, that is, considering that the vibration speed v is the intrinsic property of the system, changing the resistance R of the voice coil bobbin 3 and then changing the electromagnetic damping Re of the system can adjust the magnitude of the ampere force applied to the voice coil bobbin 3, and then adjust the vibration degree of the voice coil 2.

In the present embodiment, the resistance of the voice coil bobbin 3 can be changed by changing the material of the voice coil bobbin 3. Alternatively, the voice coil bobbin 3 may be made of a high-resistivity metal material or alloy (e.g., nickel, cobalt, zinc, magnesium, etc.) or a low-resistivity metal material or alloy (e.g., aluminum, gold, copper, silver, etc.). The voice coil framework 3 made of different materials is adopted, so that the resistor R of the voice coil framework causes proper damping to a system, and the vibration output signal of the voice coil 2 can be adjusted and optimized, so that the output efficiency is optimal.

The magnetic circuit system 1 includes at least one magnet 11, a top plate 12, and a yoke 13, and in the present embodiment, the number of the magnets 11 is two, as shown in fig. 1. The magnet 11 and the top plate 12 are annular and adapted to the shape of the voice coil 2, and are coaxially disposed inside the voice coil 2 and the voice coil bobbin 3, as shown in fig. 1 and 2. Wherein, two magnets 11 are used for providing a magnetic field, and the top piece 12 is arranged between the two magnets 11 and is magnetically connected with the magnets 11 for conducting magnetism. The yoke 13 is a basin-shaped structure having a diameter larger than that of the voice coil 2 and the voice coil bobbin 3, and has an annular protrusion at its edge for guiding the magnetic field generated by the magnet 11, so that a magnetic gap region is formed between the voice coil 2 and the magnet 11, so that the voice coil 2 vibrates in the magnetic gap region. As shown in fig. 2, the yoke 13 is disposed below the magnet 11 and the top plate 12, and the lower surface of the magnet 11 located below is fixedly connected to the upper surface of the yoke 13 by welding, adhesive bonding, or the like. The yoke 13 may be made of pure iron, cast steel, mild steel, etc., and preferably, mild steel, which is inexpensive and easy to form.

The frame 4 and the suspension 5 are located above the voice coil 2 as shown in fig. 1 and 2. The frame 4 is an annular structure matched with the shape of the voice coil 2 and used for fixing the voice coil 2. Preferably, the basin stand 4 can be made of plastic, so that the cost is low. The upper surface of the suspension 5 is fixedly connected with the basin frame 4, the lower surface of the suspension 5 is fixedly connected with the voice coil 2, and the connection modes can be welding or gluing and the like. The suspension 5 has a hollow structure, and the suspension 5 receives the vibration of the voice coil 2 so that the hollow structure thereon generates the same vibration, and the vibration of the hollow structure can generate sound, that is, the suspension 5 can convert the vibration signal into a sound signal.

It should be understood that the implementation of the frame 4 and the suspension 5 is not limited to the form shown in fig. 1, and various other forms of frame and suspension are suitable for the present invention as long as they can be fixed to the voice coil bobbin and the voice coil and follow the vibration of the voice coil.

The transducer described in this embodiment generates a magnetic field through the magnet 11, the magnetic energy drives the energized voice coil 2 to generate vibration and convert into kinetic energy, and the kinetic energy drives the suspension 5 to vibrate, sound and convert into sound energy. The voice coil framework 3 is set to be a metal ring with a preset resistance, so that the metal ring generates electromagnetic damping in a magnetic field of vibration of the voice coil 2 to further adjust the vibration degree of the voice coil 2, so as to adjust the mutual conversion degree among the magnetic energy, the kinetic energy and the sound energy, and optimize the final sound energy output quality.

Fig. 3 is a schematic diagram of a transducer according to a second embodiment of the present invention. The transducer comprises a magnetic circuit system 1, a voice coil 2, a voice coil framework 3, a basin frame 4 and a suspension 5. The voice coil bobbin 3 is provided as a closed metal ring having the same structure as that of the first embodiment described above. In the present embodiment, the voice coil bobbin 3 has different cross-sectional areas in the circumferential direction, as shown in fig. 3. That is, the distance between the voice coil bobbin 3 and the magnet 11 is smaller than that of the first embodiment. The cross-sectional area of the voice coil bobbin 3 in the circumferential direction is increased, and the resistance R of the voice coil bobbin 3 is reduced by a formula R of resistivity ═ ρ l/s (ρ is the density of the voice coil bobbin 3, and s is the cross-sectional area of the voice coil bobbin 3 in the circumferential direction), so that the electromagnetic damping Re of the system is increased, and the vibration degree of the voice coil 2 is adjusted. Alternatively, the system damping may be reduced by reducing the cross-sectional area of the voice coil bobbin 3 in the circumferential direction, and the degree of vibration of the voice coil 2 may also be adjusted. In the embodiment, the voice coil framework 3 with different cross-sectional areas along the axial direction is adopted, so that the resistance R of the voice coil framework causes proper damping to a system, and the vibration output signal of the voice coil 2 can be adjusted and optimized, so that the output efficiency is optimal.

Fig. 4-5 are schematic views of a transducer according to a third embodiment of the present invention. The transducer comprises a magnetic circuit system 1, a voice coil 2, a voice coil framework 3, a basin frame 4 and a suspension 5. The voice coil bobbin 3 is provided as a closed metal ring having a structure similar to that of the first embodiment described above, and in the present embodiment, the voice coil bobbin 3 has a different shape in the circumferential direction, as shown in fig. 1 and 4. In an alternative implementation manner, a notch 9 (shown in fig. 4 and 5) is provided on the voice coil bobbin 3, and the notch 9 changes the resistance R and the system damping Re of the voice coil bobbin 3, so as to adjust the vibration degree of the voice coil 2. In another alternative implementation, the vibration of the voice coil 2 can be adjusted by providing half-cut, hole, and protrusion on the voice coil bobbin 3.

In the embodiment, the voice coil framework 3 with different shapes along the axial direction is adopted, so that the resistor R of the voice coil framework causes proper damping to a system, and the vibration output signal of the voice coil 2 can be adjusted and optimized, so that the output efficiency is optimal.

It should be understood that the transducer of the present invention can also achieve vibration adjustment of the voice coil 2 by simultaneously changing any two or three of the material, cross-sectional area, and cross-sectional shape of the voice coil bobbin 3.

The utility model discloses a voice coil loudspeaker voice coil skeleton that conducting material made makes its to system's damping to change its resistance value through the material and/or the shape that change the voice coil loudspeaker voice coil skeleton, and then change its contribution to system's damping, the vibration degree of adjustment voice coil loudspeaker voice coil makes the output quality of transducer reach the optimum.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A transducer, comprising:

a magnetic circuit system (1) for forming a magnetic field;

a voice coil (2) disposed in a magnetic field formed by the magnetic circuit system (1) and configured to be controlled to vibrate;

a voice coil bobbin (3) made of a conductive material for fixing the voice coil (2);

the pot frame (4) is used for fixing the voice coil framework (3);

a suspension (5) connected to the voice coil bobbin (3) and configured to be controlled to vibrate;

the shape and/or material of the voice coil bobbin (3) is configured to cause the voice coil bobbin (3) to generate eddy currents for adjusting system damping when the voice coil (2) vibrates.

2. The transducer according to claim 1, characterized in that the voice coil former (3) is provided as a closed structure adapted to the shape of the voice coil (2).

3. The transducer according to claim 1, characterized in that the resistance of the voice coil former (3) is arranged to match the system damping.

4. The transducer according to claim 1, wherein the cross-sectional shape of the voice coil bobbin (3) is set such that the voice coil bobbin (3) has a predetermined resistance; and/or

The voice coil bobbin (3) is dimensioned such that the voice coil bobbin (3) has a predetermined resistance; and/or

The material of the voice coil bobbin (3) is set so that the voice coil bobbin (3) has a predetermined resistance.

5. The transducer according to claim 1, characterized in that the voice coil former (3) is provided as a closed metal ring.

6. The transducer according to claim 1, characterized in that the voice coil bobbin (3) is provided with a groove or cut-out for adjusting the resistance of the voice coil bobbin (3).

7. The transducer according to claim 1, characterized in that the magnetic circuit system (1) comprises:

at least one magnet (11);

a topsheet (12);

a yoke (13);

wherein the magnet (11), the top sheet (12) and the yoke (13) are configured to together form a magnetic field.

8. The transducer of claim 1, further comprising:

a connection block (6) for supporting the internal structure of the transducer.

9. The transducer according to claim 1, wherein the voice coil (2) is provided as a conductive coil, the conductive coil of the voice coil (2) being configured to vibrate in the magnetic field of the magnetic circuit system (1) upon being energized.

10. The transducer according to claim 1, characterized in that the suspension (5) has an openwork structure.