WO2021128004A1

WO2021128004A1 - Loudspeaker

Info

Publication number: WO2021128004A1
Application number: PCT/CN2019/127990
Authority: WO
Inventors: 吴树文; 张旺
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2021-07-01

Abstract

Disclosed is a loudspeaker. The loudspeaker comprises a vibrating diaphragm, a voice coil, and central magnetic steel, wherein the voice coil is fixed below the vibrating diaphragm and is used for driving the vibrating diaphragm; the central magnetic steel is also located below the vibrating diaphragm and is located in the voice coil; a magnetic field is formed around the central magnetic steel; the voice coil is suspended in the magnetic field, so that when the voice coil is energized, the vibrating diaphragm is pushed by vertical force generated by means of the voice coil cutting magnetic field lines in the magnetic field; and an armature used for replacing a dome is arranged below the vibrating diaphragm, the armature is located above the central magnetic steel, the armature can generate S/N poles due to energization of the voice coil, and the polarities change along with the change of a current, so that the armature and the central magnetic steel can generate an alternately changing attraction force and repulsive force, thereby increasing a BL value of the loudspeaker, and thus improving the overall performance of the loudspeaker and meeting design requirements.

Description

A kind of speaker

Technical field

The present invention relates to the technical field of electro-acoustic conversion, in particular to a loudspeaker.

Background technique

With the continuous development of science and technology, more and more electronic products are applied to speakers as their sound components, and people have higher and higher requirements for the performance of speakers. In the related art speaker, the sound film is directly glued to the dome, the coil is energized, and the up and down force is generated by cutting the magnetic field lines in the magnetic field to push the sound film to generate sound, and use the vibration of the dome to promote the flow of air , Radiate the energy. However, when the coil is energized and cuts the magnetic field lines in the magnetic field, the dome does not produce magnetism, that is, it does not produce S/N poles. It is only used to push the air to radiate the energy, resulting in poor overall performance of the speaker, and the ball The top rigidity is poor.

technical problem

In view of the shortcomings of the prior art, the purpose of the present invention is to provide a loudspeaker speaker to improve the overall performance of the loudspeaker and meet design requirements.

Technical solutions

The purpose of the present invention is achieved by adopting the following technical solutions:

A loudspeaker comprising a diaphragm, a voice coil, and a central magnetic steel, the voice coil is fixed under the diaphragm for driving the diaphragm, and the central magnetic steel is located under the diaphragm and located at the sound Among the coils, a magnetic field is formed on the peripheral side of the central magnetic steel, and the voice coil is suspended in the magnetic field, so that when the voice coil is energized, the up and down force is generated by cutting the magnetic field lines in the magnetic field. The diaphragm, an armature is arranged below the diaphragm, the armature is located above the central magnetic steel, the armature is located in the voice coil, and the upper surface of the armature is fixed on the vibrating On the membrane, the side surface of the armature is fixed on the inner wall of the voice coil, the armature can generate magnetism due to the energization of the voice coil, and the polarity of the armature changes with the change of the current, so that the The armature can generate alternating attractive and repulsive forces with the central magnet.

Preferably, the upper end of the voice coil is provided with a ring-shaped conductive part along the circumferential direction, and the ring-shaped conductive part directly contacts the diaphragm.

Preferably, the armature is provided on the inner side of the ring-shaped conductive part, and the peripheral edge of the armature is fixedly connected to the ring-shaped conductive part.

Preferably, the speaker further includes an auxiliary component, the auxiliary component includes a magnetic yoke and a basin frame, the magnetic yoke is accommodated and fixed in the basin frame, and the magnetic yoke is used to install the central magnetic steel. The outer peripheral edge of the diaphragm is fixed on the upper surface of the basin frame.

Beneficial effect

Compared with the prior art, the present invention has the following beneficial effects:

The speaker of the present invention adds an armature between the central magnetic steel and the diaphragm, and the armature is located in the voice coil and connected to the diaphragm. After the voice coil is energized, it cuts the magnetic field lines in the magnetic field to generate force. The energization of the ring produces S/N poles (S: South Pole, N: North Pole). Since the polarity of the armature changes with the current, the armature can produce alternating attractive and repulsive forces with the central magnet, thereby By increasing the BL value of the speaker, the speaker of the present invention can greatly improve the overall performance of the speaker and meet the design requirements when the speaker of the present invention is working; in addition, the armature of the present invention has better rigidity than the dome of the speaker in the related art. , Can improve the strength of the speaker of the present invention and enhance its stability.

Description of the drawings

Figure 1 is a schematic cross-sectional view of the present invention;

Figure 2 is an exploded schematic diagram of the present invention.

In the figure: 1. Diaphragm; 10. First flat part; 11. Folded ring part; 12. Second flat part; 2. Armature; 3. Voice coil; 30. Ring-shaped conductive part; 4. Central magnetic steel; 40. Magnetic steel; 41. Pole core; 5. Auxiliary components; 50. Basin frame; 51. Magnetic yoke.

Embodiments of the present invention

Below, in conjunction with the drawings and specific implementations, the present invention will be described first. It should be noted that, provided that there is no conflict, the following embodiments or technical features can be combined to form new embodiments. .

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", The orientation or positional relationship indicated by “outside” is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, It is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, they can be fixedly connected or detachably connected. Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

Implementation mode:

As shown in FIGS. 1 and 2, the speaker of this embodiment is mainly composed of a diaphragm 1, an auxiliary component 5, a central magnet 4, a voice coil 3, and an armature 2. Among them, the diaphragm 1 is composed of a first flat portion 10 located on the outside, a second flat portion 12 located on the inside, and a folding ring portion 11 located between the first flat portion 10 and the second flat portion 12. The auxiliary assembly 5 is composed of a magnetic yoke 51 and a basin frame 50. The magnetic yoke 51 is housed and fixed in the basin frame 50. The central magnetic steel 4 is installed on the magnetic yoke 51, and the central magnetic steel 4 is located on the first part of the diaphragm 1. Below the two flat parts 12 and located in the voice coil 3; in addition, the central magnetic steel 4 is composed of a magnetic steel 40 and a pole core 41 attached to the magnetic steel 40. The voice coil 3 is fixed under the diaphragm 1, that is, the voice coil 3 is fixed under the second flat portion 12 of the diaphragm 1 for driving the diaphragm 1. The outer peripheral edge of the diaphragm 1 is fixed on the upper surface of the basin frame 50, that is, the first flat portion 10 of the diaphragm 1 is set on the upper surface of the basin frame 50; the second flat portion 12 of the diaphragm 1 is set on the upper surface of the frame 50; The armature 2 replacing the dome is located above the armature 2, that is, the armature 2 is located above the central magnet 4, the upper surface of the armature 2 is fixed on the diaphragm 1, and the armature 2 is located on the voice coil 3. Inside, of course, the side surface of the armature 2 is also fixed on the inner wall of the voice coil 3; the folding ring portion 11 of the diaphragm 1 is recessed downward.

Due to the magnetic field formed on the peripheral side of the central magnet 4, the voice coil 3 is at least partially suspended in the magnetic field, so that when the voice coil 3 is energized, the magnetic field lines are cut in the magnetic field to generate up and down forces, and the voice coil 3 and the diaphragm 1 The second flat portion 12 is connected to make the diaphragm 1 vibrate under the driving of the voice coil 3 to generate driving force, so that the diaphragm 1 constantly vibrates and resonates with the surrounding air to produce sound. At the same time, when the voice coil 3 is energized to cut the magnetic field lines in the magnetic field to generate force, the armature 2 generates magnetism, so that the armature 2 generates S/N poles (S: south pole, N: north pole) due to the energization of the voice coil 3. The polarity of 2 changes with the change of the current, so that the armature 2 can generate alternating attractive and repulsive forces with the central magnet 4, thereby increasing the BL value of the loudspeaker, thereby enabling the loudspeaker of the present invention to work. Greatly improve the overall performance of the speaker to meet the design requirements.

It should be noted that the BL value is an important parameter of the loudspeaker, which is called the force coefficient. It comes from the most basic formula of the loudspeaker, that is, the force that the current-carrying conductor receives in the magnetic field F=BLI, and B is the magnetic gap flux density. , L is the wire length of voice coil 3, and I is the wire current. Since the armature 2 generates a magnetic force when the voice coil 3 is energized, the magnetic gap flux density increases, thereby increasing the BL value of the speaker, and the better the SPL (sound pressure curve) characteristic is, so that the speaker of the present invention works, Greatly improve the overall performance of the speaker to meet the design requirements.

As a preference of this embodiment, the upper end of the voice coil 3 is provided with a ring-shaped conductive portion 30 along the circumferential direction, and the ring-shaped conductive portion 30 is fixedly connected to the voice coil 3, and the armature 2 is located on the ring-shaped conductive portion 30. The inner side is fixed to the ring-shaped conductive part 30. That is, the armature 2 is located in the hollow area of the ring-shaped conductive portion 30, and the periphery of the armature 2 is fixedly connected to the ring-shaped conductive portion 30 of the voice coil 3. Of course, the ring-shaped conductive portion 30 directly contacts the diaphragm 1, so that While the voice coil 3 drives the diaphragm 1 to vibrate, the armature 2 can vibrate synchronously with the diaphragm 1, so that the sound effect produced by the speaker is better.

In addition, compared to the dome of the speaker in the related prior art, the armature 2 of the present invention can provide a BL value while pushing the air to radiate energy, so as to improve the overall performance of the speaker of the present invention; and the armature 2 is relative to the ball. At the top, the armature 2 has better rigidity, which can improve the stability of the speaker of the present invention during operation.

The foregoing embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the present invention. The scope of protection required.

Claims

A loudspeaker comprising a diaphragm, a voice coil, and a central magnetic steel, the voice coil is fixed under the diaphragm for driving the diaphragm, and the central magnetic steel is located under the diaphragm and located at the sound In the coil, a magnetic field is formed on the peripheral side of the central magnetic steel, and the voice coil is suspended in the magnetic field, so that when the voice coil is energized, the up and down force is generated by cutting the magnetic field lines in the magnetic field. The diaphragm is characterized in that: an armature is provided below the diaphragm, the armature is located above the central magnetic steel, the armature is located in the voice coil, and the upper surface of the armature is fixed On the diaphragm, the side surface of the armature is fixed on the inner wall of the voice coil, the armature can generate magnetism due to the energization of the voice coil, and the polarity of the armature changes with the change of current , So that the armature can produce alternating attractive and repulsive forces with the central magnetic steel.
The speaker according to claim 1, wherein the upper end of the voice coil is provided with a ring-shaped conductive part along the circumferential direction, the ring-shaped conductive part is located at the upper end of the voice coil, and the ring The conductive part is directly in contact with the diaphragm.
The speaker according to claim 2, wherein the armature is provided on the inner side of the ring-shaped conductive part, and the periphery of the armature is fixedly connected to the ring-shaped conductive part.
The speaker according to claim 1, wherein the speaker further comprises an auxiliary component, the auxiliary component comprises a yoke and a basin frame, the yoke is accommodated and fixed in the basin frame, and the The yoke is used to install the central magnetic steel, and the outer peripheral edge of the diaphragm is fixed to the upper surface of the basin frame.