Vibration reduction loudspeaker

Abstract

The vibration reduction loudspeaker comprises a frame body, openings in the two ends of the frame body are provided with a voice diaphragm and a vibration reduction elastic piece respectively, a voice coil and a magnetic circuit system are arranged in the frame body, and the magnetic circuit system comprises a U-shaped iron piece, magnetic steel and a washer, and the magnetic steel and the washer are sequentially arranged in the U-shaped iron piece; damping flexible pieces are connected to the two sides of the U-shaped iron piece, and any damping flexible piece is located between the side portion of the U-shaped iron piece and the side portion of the frame body. The bottom of the U-shaped iron piece is connected with the vibration reduction elastic piece. Compared with the prior art, by arranging the damping flexible piece and the vibration reduction elastic piece, the energy absorption and vibration reduction effects are jointly achieved, vibration energy conducted outwards by the magnetic circuit system is reduced, and the risk of generating resonance noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a vibration-damping loudspeaker. Background Art

[0002] Micro speakers are widely used in portable products such as smartphones, headphones, and smart wearable devices, and need to achieve high sound quality and low vibration in a limited space. The existing micro speaker structure mainly includes a sound membrane, a voice coil, a magnetic circuit system, and a frame. The magnetic circuit system and the frame are fixed by gluing. The existing structure has insufficient control over vibration conduction. The vibration of the magnetic circuit system is easily transmitted to the frame, and then transmitted to the speaker shell through the frame, causing resonance noise. Summary of the invention

[0003] The purpose of the present invention is to provide a vibration-damping speaker to solve the problem that the vibration of the magnetic circuit system in the prior art micro speaker is easily transmitted to the frame, and then transmitted to the sound box shell through the frame, causing resonance noise.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A vibration-damping loudspeaker comprises a frame, wherein a sound diaphragm and a vibration-damping spring are respectively arranged on openings at both ends of the frame, a voice coil and a magnetic circuit system are arranged inside the frame, and the magnetic circuit system comprises a U-shaped iron piece and a magnetic steel and a washer which are sequentially arranged inside the U-shaped iron piece; damping flexible pieces are connected to both sides of the U-shaped iron piece, and any damping flexible piece is located between the side of the U-shaped iron piece and the side of the frame; and the bottom of the U-shaped iron piece is connected to the vibration-damping spring.

[0006] The present invention adopts the above-mentioned technical scheme, by connecting damping flexible parts on both sides of the U-shaped iron piece, and any damping flexible part is located between the side of the U-shaped iron piece and the side of the frame. At the same time, the bottom of the U-shaped iron piece is connected to the vibration-damping spring sheet, and the flexible damping part and the vibration-damping spring sheet jointly play the role of energy absorption and vibration reduction, reducing the vibration energy transmitted to the frame by the magnetic circuit system, thereby reducing the vibration energy transmitted to the speaker housing by the frame, and reducing the risk of resonance. Compared with the problem that the vibration of the magnetic circuit system in the micro-speaker in the prior art is easily transmitted to the frame, and then transmitted to the speaker housing through the frame, causing resonance noise, the present invention arranges the damping flexible part and the vibration-damping spring sheet, which jointly play the role of energy absorption and vibration reduction, reduce the vibration energy conducted outward by the magnetic circuit system, and reduce the risk of generating resonance noise; in addition, by arranging the damping flexible part and the vibration-damping spring sheet, the displacement of the magnetic circuit system in the three directions of X, Y, and Z can also be effectively suppressed, so that the quality of the product is more stable and the consistency is better.

[0007] Furthermore, the damping flexible part is connected to the side of the U-shaped iron part by fluid injection; a gap is left between the damping flexible part and the side of the frame; the fluid injection process is usually used to coat a layer of fluid material, such as rubber, silicone or other elastomers, on the surface of existing parts or products, and the process is to coat the fluid material on the surface of the existing parts by spraying, dipping or injecting, and then form a coating layer by curing or cooling; here, the damping flexible part is integrated with the U-shaped iron part by the fluid injection process, and the two are tightly combined and reliably connected; a gap is left between the damping flexible part and the frame as a buffer space, which has a better vibration reduction effect than the tight fit between the damping flexible part and the frame.

[0008] Furthermore, the damping flexible member is in the shape of an elongated strip; the two ends of the damping flexible member are aligned with the two ends of the U-shaped iron member, or extend out of the two ends of the U-shaped iron member; with such an arrangement, the damping flexible member is longer and can cover the U-shaped iron member in the length direction, thus achieving better vibration reduction and energy absorption effect on the U-shaped iron member.

[0009] Furthermore, the damping flexible member is made of silicone or rubber; the damping flexible member made of this material has a better vibration reduction effect.

[0010] Furthermore, the vibration-damping spring sheet includes a fixed sheet, a supporting sheet and a plurality of vibration-damping arms that can be bent and deformed; the fixed sheet is annular and fixedly connected to the end of the frame; the supporting sheet is arranged in a hollow part in the middle of the fixed sheet, and is connected to the fixed sheet through a vibration-damping arm; the bottom of the U-shaped iron piece is connected to the supporting sheet; when the vibration-damping spring sheet with this structure is adopted, when the magnetic circuit system vibrates, the U-shaped iron piece squeezes the supporting sheet to generate displacement, and the vibration-damping arm can be bent and deformed to absorb energy, thereby achieving a better vibration-damping effect.

[0011] Furthermore, the two ends of the fixing plate extend out of the two ends of the U-shaped iron piece; the two ends of the supporting plate are flush with the two ends of the U-shaped iron piece, or extend out of the two ends of the U-shaped iron piece; at least one vibration-damping arm is connected between any end of the supporting plate and the adjacent end of the fixing plate; with such an arrangement, the vibration-damping plate has a simple structure, is easy to manufacture, and has a better energy absorption effect.

[0012] Furthermore, two vibration-damping arms are connected between any end of the supporting plate and the adjacent end of the fixed plate. Both vibration-damping arms are S-shaped and symmetrically arranged on both sides of the supporting plate. The vibration-damping spring sheet has a symmetrical structure as a whole, and the displacement of the supporting plate and the energy absorption of the vibration-damping arm are balanced. At the same time, the S-shaped vibration-damping arm can produce a larger deformation and has a better energy absorption effect.

[0013] Furthermore, a groove matching the shape of the carrier sheet is provided on the bottom surface of the U-shaped iron piece, and the carrier sheet is embedded in the groove; such an arrangement facilitates precise positioning between the U-shaped iron piece and the vibration-damping spring sheet when assembling the speaker.

[0014] Furthermore, the fixing plate is provided with a plurality of positioning holes, and the end surface of the frame body close to the fixing plate is provided with positioning posts corresponding to the positioning holes one by one, and the positioning posts are fixedly inserted in the positioning holes; such a configuration facilitates precise positioning between the frame body and the vibration-damping spring sheet when the speaker is assembled.

[0015] Furthermore, the bottom of the U-shaped iron piece is glued to the bearing sheet; the glue connection is easy to operate and is firm and reliable.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging the damping flexible member and the vibration-damping spring sheet, they jointly play the role of energy absorption and vibration reduction, reduce the vibration energy transmitted outward by the magnetic circuit system, and reduce the risk of generating resonance noise; by arranging the damping flexible member and the vibration-damping spring sheet, the displacement of the magnetic circuit system in the three directions of X, Y, and Z can also be effectively suppressed, so that the quality of the product is more stable and the consistency is better; the damping flexible member is integrated with the U-shaped iron member through the fluid injection process, and the two are tightly combined and reliably connected; a gap is left between the damping flexible member and the frame as a buffer space, and the vibration-damping effect is better than that of the damping flexible member and the frame being tightly fitted; the vibration-damping spring sheet includes a fixing sheet, a bearing sheet, and a plurality of bendable and deformable vibration-damping arms. When the vibration-damping spring sheet of this structure is adopted, when the magnetic circuit system vibrates, the U-shaped iron member squeezes the bearing sheet to produce displacement, and the vibration-damping arm can bend and deform to absorb energy, and the vibration-damping effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0019] Figure 3 An exploded view of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the present invention after the sound film is removed;

[0021] Figure 5 It is a schematic diagram of the structure of the U-shaped iron piece, the damping flexible piece and the vibration-absorbing spring;

[0022] Figure 6 It is a schematic diagram of the structure of the vibration-damping shrapnel;

[0023] Figure 7 It is a schematic diagram of the structure of the U-shaped iron piece and the damping flexible piece;

[0024] Figure 8 This is a schematic diagram of the four-point vibration reduction effect test structure of the speaker cabinet;

[0025] Fig. 9 The figure is a schematic diagram of the test results of the four-point vibration reduction effect of a speaker cabinet installed with an existing speaker.

[0026] Fig.10 It is a schematic diagram of the test results of the four-point vibration reduction effect of the speaker box installed with the present invention.

[0027] Markings in the figure: 01-speaker, 02-speaker box, 1-sound membrane, 2-voice coil, 3-frame, 31-positioning column, 32-block, 4-flexible circuit board, 5-washer, 6-magnetic steel, 7-U-shaped iron piece, 71-groove, 8-damping flexible part, 81-card slot, 9-vibration-damping spring, 91-fixing plate, 92-carrying plate, 93-vibration-damping arm, 94-positioning hole. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] This embodiment provides a vibration reduction speaker, such as Figure 1-Figure 7 As shown, it includes a frame 3, and a sound film 1 and a vibration-damping spring sheet 9 are respectively arranged on the openings at both ends of the frame 3. A voice coil 2 and a magnetic circuit system are arranged inside the frame 3. The magnetic circuit system includes a U-shaped iron piece 7 and a magnetic steel 6 and a washer 5 which are sequentially arranged in the U-shaped iron piece 7; both sides of the U-shaped iron piece 7 are connected with a damping flexible piece 8, and any damping flexible piece 8 is located between the side of the U-shaped iron piece 7 and the side of the frame 3; the bottom of the U-shaped iron piece 7 is connected to the vibration-damping spring sheet 9;

[0031] The damping flexible member 8 is connected to the side of the U-shaped iron member 7 by fluid injection; the damping flexible member 8 is in contact with or has a gap with the side of the frame 3; in this embodiment, a scheme in which a gap is left between the damping flexible member 8 and the side of the frame 3 is selected, specifically: the damping flexible member 8 is in the shape of a long strip, and its cross section is rectangular, one side surface of which is connected to the U-shaped iron member 7, and a gap is left between the other side surface opposite to the side surface and the side of the frame 3, and the gap is about 0.1 mm;

[0032] The two ends of the damping flexible member 8 are aligned with the two ends of the U-shaped iron member 7, or extend out of the two ends of the U-shaped iron member 7;

[0033] The damping flexible member 8 is made of silicone or rubber; in this embodiment, the damping flexible member 8 is made of silicone;

[0034] A slot 81 is provided on one side of the damping flexible member 8 facing the side of the frame 3, and a block 32 is provided at a corresponding position on the side of the frame 3. The block 32 is engaged in the slot 81, so as to facilitate accurate positioning of the damping flexible member 8 and the frame 3 when assembling the speaker;

[0035] The vibration-damping spring sheet 9 includes a fixing sheet 91, a bearing sheet 92 and a plurality of vibration-damping arms 93 that can be bent and deformed; the fixing sheet 91 is annular and fixedly connected to the end of the frame 3; the bearing sheet 92 is arranged at the hollow part in the middle of the fixing sheet 91 and is connected to the fixing sheet 91 through the vibration-damping arms 93; the bottom of the U-shaped iron piece 7 is connected to the bearing sheet 92;

[0036] The two ends of the fixing sheet 91 extend out of the two ends of the U-shaped iron piece 7; the two ends of the bearing sheet 92 are flush with the two ends of the U-shaped iron piece 7, or extend out of the two ends of the U-shaped iron piece 7; at least one vibration-damping arm 93 is connected between any end of the bearing sheet 92 and the end of the adjacent fixing sheet 91; in this embodiment, two vibration-damping arms 93 are connected between any end of the bearing sheet 92 and the end of the adjacent fixing sheet 91, and the two vibration-damping arms 93 are both S-shaped and symmetrically arranged on both sides of the bearing sheet 92;

[0037] A groove 71 matching the shape of the carrier sheet 92 is formed on the bottom surface of the U-shaped iron piece 7, and the carrier sheet 92 is embedded in the groove 71;

[0038] The fixing plate 91 is provided with a plurality of positioning holes 94. One end of the frame 3 close to the fixing plate 91 is provided with positioning posts 31 corresponding to the positioning holes 94 one by one. The positioning posts 31 are fixedly inserted into the positioning holes 94. The positioning posts 31 are connected to the corresponding positioning holes 94 by hot melt, thereby ensuring the connection strength between the frame 3 and the fixing plate 91.

[0039] The bottom of the U-shaped iron piece 7 is glued and connected to the carrier sheet 92;

[0040] The loudspeaker also includes a flexible circuit board 4 electrically connected to the voice coil 2, which is connected to the frame 3 by gluing; when the loudspeaker is working, the flexible circuit board 4 transmits the audio electrical signal to the voice coil 2, an alternating magnetic field is generated around the voice coil 2, and interacts with the magnetic field of the magnetic circuit system inside the loudspeaker, causing the voice coil 2 and the connected sound membrane 1 to vibrate, thereby producing sound.

[0041] Test the vibration reduction effect, such as Figure 8 As shown, the speaker 01 is installed in the sound box 02 with a standard CC number, and the amplitude of the surface of the sound box 02 at four points a, b, c, and d is measured under different frequencies of the sweep signal; by installing the speaker of the present invention and the existing speaker respectively, and measuring and comparing them respectively, it is verified whether the speaker of the present invention can effectively reduce the amplitude. The test results of the existing speaker (without the damping flexible member and the vibration reduction spring structure) are shown as follows: Fig. 9 As shown, the amplitude of the four points is between 0.15mm and 0.2mm; the test results of the speaker of the present invention are as follows Fig.10 As shown, the amplitudes at the four points are about 0.03 mm, which shows that the vibration reduction effect of the speaker of the present invention is obvious.

[0042] The present invention adopts the above-mentioned technical scheme, by arranging damping flexible parts 8 between the two sides of the U-shaped iron piece 7 and the two sides of the frame 3, the opposite side surfaces on any damping flexible part 8 are respectively connected to the side of the U-shaped iron piece 7 and the side of the frame 3, and at the same time, the bottom of the U-shaped iron piece 7 is connected to the vibration-damping spring sheet 9, and the flexible damping part 8 and the vibration-damping spring sheet 9 jointly play the role of energy absorption and vibration reduction, thereby reducing the vibration energy transmitted from the magnetic circuit system to the frame 3, thereby reducing the vibration energy transmitted from the frame 3 to the speaker housing, and reducing the risk of resonance. Compared with the problem that the vibration of the magnetic circuit system in the micro-speaker in the prior art is easily transmitted to the frame, and then transmitted to the speaker housing through the frame, causing the problem of resonance noise, the present invention arranges the damping flexible part 8 and the vibration-damping spring sheet 9, which jointly play the role of energy absorption and vibration reduction, thereby reducing the outward transmission of the magnetic circuit system The conducted vibration energy reduces the risk of generating resonance noise; at the same time, by setting the damping flexible member 8 and the vibration-damping spring 9, the displacement of the magnetic circuit system in the three directions of X, Y and Z can be effectively suppressed, so that the quality of the product is more stable and the consistency is better; the damping flexible member 8 is integrated with the U-shaped iron member 7 through the fluid injection process, and the two are tightly combined and reliably connected; a gap is left between the damping flexible member 8 and the frame 3 as a buffer space, and the vibration-damping effect is better than that of the damping flexible member 8 and the frame 3 being tightly matched; the vibration-damping spring 9 includes a fixing plate 91, a bearing plate 92 and a plurality of vibration-damping arms 93 that can be bent and deformed. When the vibration-damping spring 9 of this structure is adopted, when the magnetic circuit system vibrates, the U-shaped iron member 7 squeezes the bearing plate 92 to produce displacement, and the vibration-damping arm 93 can be bent and deformed to absorb energy, and the vibration-damping effect is better.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vibration-damping loudspeaker, characterized in that: The invention comprises a frame (3), wherein openings at both ends of the frame (3) are respectively provided with a sound membrane (1) and a vibration-damping spring sheet (9), wherein a voice coil (2) and a magnetic circuit system are arranged inside the frame (3), wherein the magnetic circuit system comprises a U-shaped iron piece (7) and a magnetic steel (6) and a washer (5) which are sequentially arranged inside the U-shaped iron piece (7); both sides of the U-shaped iron piece (7) are connected with damping flexible pieces (8), and any damping flexible piece (8) is located between the side of the U-shaped iron piece (7) and the side of the frame (3); and the bottom of the U-shaped iron piece (7) is connected with the vibration-damping spring sheet (9).

2. The vibration-damping speaker according to claim 1, characterized in that: The damping flexible member (8) is connected to the side of the U-shaped iron member (7) by fluid injection; a gap is left between the damping flexible member (8) and the side of the frame (3).

3. The vibration-damping speaker according to claim 1, characterized in that: The damping flexible member (8) is in the shape of an elongated strip; two ends of the damping flexible member (8) are aligned with two ends of the U-shaped iron member (7), or extend beyond two ends of the U-shaped iron member (7).

4. The vibration-damping speaker according to claim 1, characterized in that: The damping flexible member (8) is made of silica gel or rubber.

5. The vibration-damping speaker according to claim 1, characterized in that: The vibration-damping spring sheet (9) comprises a fixing sheet (91), a bearing sheet (92) and a plurality of vibration-damping arms (93) that can be bent and deformed; the fixing sheet (91) is annular and fixedly connected to the end of the frame (3); the bearing sheet (92) is arranged at a hollowed-out portion in the middle of the fixing sheet (91) and is connected to the fixing sheet (91) via the vibration-damping arms (93); and the bottom of the U-shaped iron piece (7) is connected to the bearing sheet (92).

6. The vibration-damping loudspeaker according to claim 5, characterized in that: The two ends of the fixing plate (91) extend out of the two ends of the U-shaped iron piece (7); the two ends of the bearing plate (92) are flush with the two ends of the U-shaped iron piece (7), or extend out of the two ends of the U-shaped iron piece (7); at least one vibration damping arm (93) is connected between any end of the bearing plate (92) and an adjacent end of the fixing plate (91).

7. The vibration-damping loudspeaker according to claim 6, characterized in that: Two vibration-damping arms (93) are connected between any end of the carrier sheet (92) and the end of the adjacent fixing sheet (91); both vibration-damping arms (93) are S-shaped and symmetrically arranged on both sides of the carrier sheet (92).

8. The vibration-damping speaker according to claim 6, characterized in that: A groove (71) matching the shape of the bearing sheet (92) is formed on the bottom surface of the U-shaped iron piece (7), and the bearing sheet (92) is embedded in the groove (71).

9. The vibration-damping speaker according to claim 5, characterized in that: The fixing plate (91) is provided with a plurality of positioning holes (94); one end of the frame (3) close to the fixing plate (91) is provided with positioning posts (31) corresponding to the positioning holes (94) one by one; and the positioning posts (31) are fixedly inserted in the positioning holes (94).

10. The vibration-damping loudspeaker according to claim 5, characterized in that: The bottom of the U-shaped iron piece (7) is glued and connected to the carrier sheet (92).

Images