Sound generating device

Abstract

The present invention provides a sound generating device. [Solution] The sound generating device includes a frame, a vibration system, and a magnetic circuit system, the magnetic circuit system including a yoke and a magnetic steel assembly, the vibration system including a vibrating membrane and a voice coil, the voice coil including a pair of longitudinal sides and a pair of lateral sides, the magnetic steel assembly including a main magnetic steel fixed to the yoke, and a sub-magnetic steel surrounding the main magnetic steel and spaced apart from the main magnetic steel to form the magnetic gap, the sub-magnetic steel including two first sub-magnetic steels located on opposite sides of the main magnetic steel and two second sub-magnetic steels located on the other opposite sides of the main magnetic steel, the second sub-magnetic steel including a main body and an extension extending from the main body toward the first sub-magnetic steel, the extension being at least partially projected along the extension direction of the lateral sides of the voice coil on the voice coil. Compared to the related art, the magnetic circuit system of the present invention has a higher magnetic force.

Description

Technical Field

[0001] The present invention relates to the field of electroacoustic conversion, and particularly to a sound emitting device applied to electronic speaker products.

Background Art

[0002] A sound emitting device, also called a speaker or a horn, is applied to a speaker product and realizes converting an audio signal into sound for playback.

[0003] A related art sound emitting device includes a frame having an annular shape, a vibration system respectively fixed to the frame, and a magnetic circuit system for driving the vibration system to vibrate and emit sound. The magnetic circuit system includes a yoke fixed to the frame and a magnetic steel assembly accommodated and fixed in the magnetic yoke. The magnetic yoke and the magnetic steel assembly are installed at an interval to form a magnetic gap. The magnetic steel assembly includes a main magnetic steel and a sub-magnetic steel surrounding the main magnetic steel. The sub-magnetic steel has a hollow annular structure. The sub-magnetic steel of this structure has a high cost and is prone to magnetization crushing problems when using high-grade magnetic steel.

[0004] Therefore, in order to solve the above technical problems, it is necessary to provide a new sound emitting device.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a sound emitting device with better stability.

Means for Solving the Problems

[0006] To achieve the above object, the present invention provides a sound generating device, which includes a frame, a vibration system fixed to the frame respectively, and a magnetic circuit system for driving the vibration system to vibrate and generate sound. The magnetic circuit system includes a yoke fixed to the frame and a magnetic steel assembly fixed to the yoke and having a magnetic gap. The vibration system includes a diaphragm and a voice coil inserted into the magnetic gap for driving the diaphragm to vibrate and generate sound. The voice coil includes a pair of longitudinal sides and a pair of transverse sides. The magnetic steel assembly includes a main magnetic steel fixed to the yoke and a sub-magnetic steel installed surrounding the main magnetic steel and forming the magnetic gap at a distance from the main magnetic steel. The sub-magnetic steel includes two first sub-magnetic steels located on both opposite sides of the main magnetic steel respectively, and two second sub-magnetic steels located on both other opposite sides of the main magnetic steel. The second sub-magnetic steel includes a main body portion and an extending portion extending from the main body portion towards the first sub-magnetic steel. The projection of the extending portion along the extending direction of the transverse side of the voice coil is at least partially located on the voice coil.

[0007] Preferably, the projection of the extending portion along the extending direction of the transverse side of the voice coil is entirely located on the voice coil.

[0008] Preferably, the projection of the first sub-magnetic steel along the extending direction of the longitudinal side of the voice coil is entirely located on the extending portion.

[0009] Preferably, the extending portion includes an extending surface facing the first sub-magnetic steel, an outer arc surface connecting one end of the extending surface and the outer surface of the main body portion, and an inner arc surface connecting the other end of the extending surface and the inner surface of the main body portion.

[0010] Preferably, the length of the extending portion along the extending direction of the transverse side of the voice coil is greater than the length of the first sub-magnetic steel along the extending direction of the transverse side of the voice coil.

[0011] Preferably, the extending surface abuts against the first auxiliary ferromagnetic steel.

[0012] Preferably, the outer arc surface of the extending portion and the outer surface of the yoke portion corresponding thereto are located in the same plane.

[0013] Preferably, the first auxiliary ferromagnetic steel is located on both sides of the longitudinal side of the voice coil, and the second auxiliary ferromagnetic steel is located on both sides of the short-side of the voice coil.

[0014] Preferably, the magnetic circuit system further includes a main pole plate disposed on the main ferromagnetic steel, a sub-pole plate disposed on the auxiliary ferromagnetic steel, and an upper ferromagnetic steel disposed on the main pole plate.

[0015] Preferably, the diaphragm is fixed to the upper ferromagnetic steel.

Advantages of the Invention

[0016] Compared with the related art, in the sound emitting device of the present invention, an extending portion is provided on the second auxiliary ferromagnetic steel, and at least a part of the projection of the extending portion along the extending direction of the short-side of the voice coil is located on the voice coil, thereby increasing the area of the auxiliary ferromagnetic steel, improving the BL of the magnetic circuit system, and improving the performance of the sound emitting device.

Brief Description of the Drawings

[0017] To more clearly explain the technical solution in the embodiments of the present invention, the drawings necessary for the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0018] Hereinafter, with reference to the drawings in the embodiments of the present invention, the technical solution means in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained on the premise that those skilled in the art do not perform creative labor shall fall within the protection scope of the present invention.

[0019] At the same time, as shown in FIGS. 1 to 4, the present invention provides a sound emitting device 100, and the sound emitting device 100 includes a frame 1, a vibration system 20 fixed to the frame 1 respectively, and a magnetic circuit system 30 that drives the vibration system 20 to vibrate and generate sound.

[0020] The frame 1 includes an upper cover 11, a lower cover 13, and a middle frame 12 located between the upper cover 11 and the lower cover 13. The upper cover 11, the middle frame 12, and the lower cover 13 are covered and connected together to form a space for accommodating the vibration system 20 and the magnetic circuit system 30.

[0021] The vibration system 20 includes a vibration assembly 21 on which a vibration membrane 210 is installed, and a voice coil 22 that drives the vibration membrane 210 to vibrate and generate sound. The voice coil 22 is of a track type, and the voice coil 22 includes a pair of longitudinal sides 221 and a pair of short transverse sides 222.

[0022] The magnetic circuit system 30 includes a yoke 31 fixed to the frame 1 and a magnetic steel assembly 32 fixed to the yoke 31. The magnetic steel assembly 32 has a magnetic gap 301. The magnetic steel assembly 32 includes a main magnetic steel 321 and a secondary magnetic steel 322 that is installed to surround the main magnetic steel 321 and forms the magnetic gap 301 at an interval from the main magnetic steel 321. The voice coil 22 is inserted into the magnetic gap 301. The secondary magnetic steel 322 includes two first secondary magnetic steels 3221 located on opposite sides of the main magnetic steel 321 and two second secondary magnetic steels 3220 located on the other opposite sides of the main magnetic steel 321. In this embodiment, the two first secondary magnetic steels 3221 are located on both sides of the longitudinal side 221 of the voice coil 22, and the two second secondary magnetic steels 3220 are located on both sides of the short side 222 of the voice coil 22.

[0023] In this embodiment, the second secondary magnetic steel 3220 includes a main body portion 3222 and an extending portion 3223 that extends by being bent from the main body portion 3222 toward the first secondary magnetic steel 3221. The projection of the extending portion 3223 along the extending direction of the short side 222 of the voice coil 22 is at least partially located in the voice coil 22. Thereby, in the existing space, the second secondary magnetic steel 3220 can be increased to improve the BL (magnetic force) of the magnetic circuit system. In this embodiment, the projection of the extending portion 3223 along the extending direction of the short side 222 of the voice coil 22 is entirely located in the voice coil 22. Further, the projection of the first secondary magnetic steel 3221 along the extending direction of the longitudinal side 221 of the voice coil 22 is entirely located in the extending portion 3223. That is, an extending surface 32231 facing the first secondary magnetic steel 3221 is provided on the extending portion 3223, and the length of the extending surface 32231 along the extending direction of the short side 222 of the voice coil 22 is equal to or greater than the length of the first secondary magnetic steel 3221 along the extending direction of the short side 222 of the voice coil 22. Thereby, the BL can be maximized and improved under the same dimensional conditions. Further, the extending surface 32231 may be in contact with the first secondary magnetic steel 3221 or may be installed at an interval facing the first secondary magnetic steel 3221.

[0024] Furthermore, the extending portion 3223 further includes an outer arc surface 32232 connecting one end of the extending surface 32231 and the outer surface of the main body portion 3222, and an inner arc surface 32233 connecting the other end of the extending surface and the inner surface of the main body portion. The outer arc surface 32232 and the outer surface of the corresponding yoke 31 are in the same plane, and the inner arc surface 32233 is installed facing the corner of the voice coil 22.

[0025] Also, in both of the two second auxiliary magnetic steels 3220, the extending portion 3223 is installed, and at both ends of each second auxiliary magnetic steel 3220, the extending portion 3223 is installed. Thereby, the first auxiliary magnetic steel 3221 and the second auxiliary magnetic steel 3220 are installed around the voice coil 22, maximizing the area of the auxiliary magnetic steel 322 and improving the BL.

[0026] The magnetic circuit system 30 further includes a main pole plate 331 disposed on the main magnetic steel 321, a sub-pole plate 332 disposed on the auxiliary magnetic steel 322, and an upper magnetic steel 34 disposed on the main pole plate 331. The sub-pole plate 332 has a hollow annular structure, and the diaphragm 210 is fixed to the upper magnetic steel 34. The upper magnetic steel 34 can not only fixedly support the diaphragm 210 but also improve the BL.

[0027] In this embodiment, the sound emitting device 100 further includes a ventilation isolation member 40. One end of the ventilation isolation member 40 is fixed to the second auxiliary magnetic steel 3220, and the other end is fixed to the lower cover 13.

[0028] Thereby, in this embodiment, by installing the extending portion 3223 on the second auxiliary magnetic steel 3220, and the projection of the extending portion 3223 along the extending direction of the short side 222 of the voice coil 22 is at least partially located on the voice coil 22, the area of the auxiliary magnetic steel 322 is increased, the BL of the magnetic circuit system is improved, and the performance of the sound emitting device 100 is improved.

[0029] What has been described above is only embodiments of the present invention. For those skilled in the technical field to which the present invention pertains, various modifications can be made without departing from the creative concept of the present invention, and all of these should be understood to belong to the protection scope of the present invention.

Claims

1. A sound generating device, comprising: a frame; a vibration system fixed to the frame; and a magnetic circuit system for driving the vibration system so that the vibration system vibrates and produces sound. The magnetic circuit system comprises a yoke fixed to the frame; and a magnetic steel assembly fixed to the yoke and having a magnetic gap. The vibration system comprises a vibrating membrane and a voice coil inserted in the magnetic gap for driving the vibrating membrane so that the vibrating membrane vibrates and produces sound. The voice coil comprises a pair of longitudinal sides and a pair of lateral sides. The magnetic steel assembly comprises a magnetic steel assembly having a magnetic gap. a main magnetic steel fixed to a yoke; and a sub-magnetic steel arranged to surround the main magnetic steel and spaced apart from the main magnetic steel to form the magnetic gap, the sub-magnetic steel including two first sub-magnetic steel pieces located on opposing sides of the main magnetic steel and two second sub-magnetic steel pieces located on the other opposing sides of the main magnetic steel, the second sub-magnetic steel pieces including a main body and an extension portion extending from the main body toward the first sub-magnetic steel, the projection of the extension portion along the extension direction of the short side of the voice coil being at least partially located on the voice coil, the extension portion includes an extension surface facing the first sub-magnetic steel, an outer arc surface connecting one end of the extension surface and an outer surface of the main body portion, and an inner arc surface connecting the other end of the extension surface and an inner surface of the main body portion, The extension surface abuts against the first sub-magnetic steel, The magnetic circuit system further includes a main pole plate disposed on the main magnetic steel, a sub pole plate disposed on the sub magnetic steel, and an upper magnetic steel disposed on the main pole plate; A sound-producing device, characterized in that the vibrating membrane is fixed to the upper magnetic steel.

2. 2. The sound generating device according to claim 1, wherein the projections of the extension parts along the extension direction of the short sides of the voice coil are all positioned on the voice coil.

3. 2. The sound generation device according to claim 1, wherein the first sub-magnetic steel has a projection along an extension direction of a longitudinal side of the voice coil all positioned on the extension portion.

4. 2. The sound generating device according to claim 1, wherein a length of the extension portion along the extension direction of a short side of the voice coil is greater than a length of the first sub-magnetic steel along the extension direction of the short side of the voice coil.

5. 2. The sound generating device according to claim 1, wherein the outer arc surface of the extension portion and the outer surface of the corresponding yoke portion are positioned on the same plane.

6. 2. The sound generation device according to claim 1, wherein the first sub-magnetic steel is located on both sides of a longitudinal side of the voice coil, and the second sub-magnetic steel is located on both sides of a lateral side of the voice coil.

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