WO2023241441A1

WO2023241441A1 - Elastic sheet, bone conduction sound generation device, and bone conduction earphones

Info

Publication number: WO2023241441A1
Application number: PCT/CN2023/099048
Authority: WO
Inventors: 陈磊; 刘彬; 陶志勇
Original assignee: 苏州索迩电子技术有限公司
Priority date: 2022-06-15
Filing date: 2023-06-08
Publication date: 2023-12-21
Also published as: CN218041717U

Abstract

Disclosed in the present invention are an elastic sheet, a bone conduction sound generation device, and bone conduction earphones. The elastic sheet comprises a body (2), an outer bracket (3) and an elastic arm (5). The outer bracket (3) is arranged outside the body (2); an interval space (4) is formed between the body (2) and the outer bracket (3); the elastic arm (5) is arranged in the interval space (4) and is connected between the body (2) and the outer bracket (3); and the elastic arm (5) bulges, relative to the body (2) and the outer bracket (3), towards one side of the elastic sheet. In the present invention, the elastic arm of the elastic sheet bulges, relative to the body and the outer bracket, towards one side of the elastic sheet, and when the elastic sheet is mounted on the bone conduction sound generation device, a larger distance between the elastic arm and a vibration component is formed, such that the risk of the vibration component impacting the elastic arm can be effectively reduced, such that the vibration frequency F0 is reduced, and thereby improving the low-frequency effect.

Description

A shrapnel, bone conduction sound-generating device and bone conduction earphones

Priority information: This application claims priority from Chinese patent application No. 202221499674.7, filed on June 15, 2022.

Technical field

The present invention relates to the technical field of bone conduction, and in particular to a shrapnel, a bone conduction sound-generating device and a bone conduction earphone.

Background technique

Bone conduction headphones are headphones that use the principle of bone conduction to produce sound. They are equipped with a bone conduction sound device for vibrating sound. Referring to Figure 1, Figure 1 shows a bone conduction sound-generating device, which includes a shell 1, a vibration component 10, a coil component 11, a spacer 12 and an elastic piece 13. The coil component 11, the spacer 12 and the vibration component 10 are all located on In the shell 1, the central part of the vibration component 10 and the elastic piece 13 are connected through a spacer 12, and the outer edge of the elastic piece 13 is connected to the shell 1. The coil component 11 drives the vibration component 10 to vibrate through the magnetic field generated by energization. When the vibration component 10 deviates from the balance, After reaching the position, the elastic piece 13 undergoes elastic deformation, thereby generating a restoring force that drives the vibration component 10 to reset.

The elastic piece 13 is in the shape of a flat piece, and the spacer 12 provided between the elastic piece 13 and the vibration component 10 can prevent the vibration component 10 from contacting the elastic piece 13 during vibration, thereby improving the low-frequency effect. Generally, the greater the thickness of the spacer 12, the greater the deformation amount that the elastic piece 13 can deform, and the greater the amplitude of the vibration component 10. However, due to the limited space in the housing 1, the larger the spacer 12 is, the smaller the volume of the coil component 11 and the vibration component 10 will be if the space remains unchanged, which is not conducive to improving the driving force. In addition, when the vibration component 10 undergoes a large displacement, such as when the input voltage is too high or when a drop reliability test is performed, the vibration component 10 is likely to hit the elastic piece 13 and cause damage to the elastic piece 13 or the vibration assembly 10 .

Therefore, it is necessary to improve the related technology to overcome the defects in the related technology.

Contents of the invention

The object of the present invention is to provide a shrapnel, a bone conduction sound-emitting device and a bone conduction earphone. The shrapnel is helpful to reduce the risk of the vibration component colliding with the shrapnel due to excessive displacement when the input voltage is too high or a drop occurs.

In order to achieve the above-mentioned object of the invention, in the first aspect, the invention proposes a spring piece, including:

ontology;

An outer bracket is provided on the outside of the body, and a space is formed between the body and the outer bracket; and,

An elastic arm is provided in the separation space and connected between the body and the outer bracket. The elastic arm protrudes toward one side of the elastic piece relative to the body and the outer bracket.

Further, the cross-sectional profile of the elastic arm is convex along the central axis direction of the body, and the cross-sectional profile includes one or more of an arc portion, an inclined portion and a horizontal portion.

Further, one end of the elastic arm is connected to the inner circumferential surface of the outer bracket, and the other end is connected to the outer circumferential surface of the body. The elastic arm is at the same distance from the inner circumferential surface or the outer circumferential surface. The bump heights are the same.

Further, the separation space is annular, and the ratio of the maximum protrusion height of the elastic arm to the annular width of the separation space ranges from 0.05 to 0.5.

Further, the spacing space is annular, and the elastic piece includes three elastic arms. The elastic arms include a first end connected to the inner peripheral surface of the outer bracket and an outer peripheral surface of the body. The second end portion is connected face to face, the connection point between the first end portion and the inner peripheral surface forms a first boundary line, and the connection point between the second end portion and the outer peripheral surface forms a second boundary line, so The center O of the body and the midpoint of the first boundary line form a first reference line, the center O of the body and the midpoint of the second boundary line form a second reference line, the first reference line and The absolute value of the angle between the second reference lines is greater than 180°.

Further, the separation space is annular, and the elastic arm includes a first end connected to the inner peripheral surface of the outer bracket and a second end connected to the outer peripheral surface of the body. The portion of the arm located between the first end and the second end includes at least one folded portion.

Further, the elastic arm includes a first arm connected to the first end, a second arm connected to the second end, and an elastic arm located between the first arm and the second arm. The elastic arm further includes a first folded portion connecting the first arm portion and the second arm portion and a third arm portion connecting the second arm portion and the third arm portion. The second reentry part.

Further, the elastic piece includes three elastic arms, the connection between the first end and the inner circumferential surface forms a first boundary line, and the connection between the second end and the outer circumferential surface forms a second hand Boundary line, the center O of the body and the midpoint of the first boundary line form a first reference line, the center O of the body and the midpoint of the second boundary line form a second reference line, the first The absolute value of the angle between the reference line and the second reference line is not greater than 60 degrees.

Further, the tangent points between the center O of the body and the outer contours of the adjacent first and second folded parts form a third reference line and a fourth reference line. The third reference line and the fourth reference line The angle between the reference lines is 1 to 70°.

In a second aspect, the present invention provides a bone conduction sound-generating device, including the elastic piece as described in any one of the above items.

Further, the bone conduction sound generating device also includes:

A shell, the outer bracket of the elastic piece is connected to the shell; and,

A vibration component is connected to the body of the elastic piece. The vibration component is used to vibrate in the housing. The elastic arm of the elastic piece protrudes in a direction away from the vibration component.

Furthermore, the bone conduction sound-generating device further includes a coil component fixed relatively to the housing, and the coil component is used to drive the vibration component to vibrate.

Further, the coil assembly includes a magnetic conductive plate connected to the housing, a coil and a first magnet both connected to the magnetic conductive plate, and the first magnet is provided in the coil;

The vibration component includes a magnetically conductive bowl connected to the body of the elastic piece and a second magnet located in the magnetically conductive bowl. The first magnet and the second magnet are relatively spaced apart and have the same polarity. Arranged oppositely, the elastic arm of the elastic piece protrudes in a direction away from the magnetic conductive bowl.

Further, the vibration component further includes a spacer piece connected between the body and the magnetic conductive bowl, and the magnetic conductive bowl is provided with a rounded corner on the outer edge of the end face toward the elastic piece.

In a third aspect, the present invention also provides a bone conduction earphone, including a spring piece as described in any one of the above items or a bone conduction sound-generating device as described in any of the above items.

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

1. In the present invention, the elastic arm of the elastic piece protrudes toward one side of the elastic piece relative to the body and the outer bracket. When the elastic piece is installed on the bone conduction sound-generating device, the distance between the elastic arm and the vibration component is larger, which can effectively reduce vibration. The risk of components hitting the elastic arm prevents damage to the elastic arm or vibration components due to excessive input voltage, drops or other abnormal conditions, and can significantly improve the pass rate of the drop reliability test. In addition, , the amplitude of the bone conduction sound device Being able to make it larger will help reduce the vibration frequency F0 and improve the low-frequency effect.

2. As an improvement, the elastic arm is provided with a return part, which can make full use of the interval space to increase the length of the elastic arm, so that the elastic piece has a larger amplitude, which is beneficial to reducing the vibration frequency F0 and improving the low-frequency effect.

Description of the drawings

Figure 1 is a schematic cross-sectional view of the bone conduction sound-generating device described in the background art.

Figure 2 is a schematic structural diagram of the elastic piece in Embodiment 1 of the present invention.

FIG. 3 is a top view of the elastic piece shown in FIG. 2 .

FIG. 4 is a cross-sectional view along line A-A in FIG. 3 .

Figure 5 is a top view of the elastic piece according to an embodiment of the present invention. In the figure, the outer bracket is in the shape of a broken ring.

Figure 6 is a schematic structural diagram of the elastic piece in Embodiment 2 of the present invention.

Figure 7 is a schematic structural diagram of a bone conduction sound-generating device according to an embodiment of the present invention.

FIG. 8 is a cross-sectional view of the bone conduction sound-generating device in FIG. 7 .

Figure 9 is a cross-sectional view of an elastic piece according to an embodiment of the present invention. In the figure, the cross-sectional profile of the elastic piece includes an arc portion.

Figure 10 is a cross-sectional view of an elastic piece according to an embodiment of the present invention. In the figure, the cross-sectional profile of the elastic piece includes an inclined portion and a horizontal portion.

Figure 11 is a top view of the spring piece shown in Figure 2, with equidistant lines shown in the figure.

FIG. 12 is a top view of the elastic piece shown in FIG. 6 .

Figure 13 is a schematic structural diagram of the elastic piece in Embodiment 3 of the present invention.

FIG. 14 is a top view of the elastic piece shown in FIG. 13 .

FIG. 15 is a cross-sectional view along the line C-C in FIG. 14 .

Figure 16 is a cross-sectional view of a bone conduction earphone according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and easy to understand, the specific implementation modes of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for convenience of description, only some but not all structures related to the present application are shown in the drawings. Based on this application The embodiments in the application, and all other embodiments obtained by those of ordinary skill in the art without creative efforts, fall within the scope of protection of this application.

The terms "including" and "having" and any variations thereof in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes Other steps or units inherent to such processes, methods, products or devices.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

As shown in Figures 2 to 4, the elastic piece 7 corresponding to a preferred embodiment of the present invention includes a body 2, an outer bracket 3 and an elastic arm 5 connected between the body 2 and the outer bracket 3.

Both the main body 2 and the outer bracket 3 are roughly in the shape of a sheet, and they are arranged in parallel. The thickness of the two can be the same or different, and preferably the thickness of the two is the same. When the elastic piece 7 is placed horizontally, the main body 2 and the outer bracket 3 can be staggered in the vertical direction (that is, at different heights), or they can be completely overlapped or partially overlapped. As a preferred embodiment, the elastic piece 7 7. In the natural state (unstressed state), the bottom surface of its body 2 and the outer bracket 3 are on the same horizontal plane.

A spacing space 4 is formed between the outer bracket 3 and the body 2. Specifically, the spacing space 4 is formed between the inner peripheral surface 30 of the outer bracket 3 and the outer peripheral surface 21 of the main body 2. In some embodiments, such as the embodiments shown in Figures 2, 6 and 13, the outer bracket 3 is annular and surrounds the outside of the body 2, thereby forming an annular spacing space 4. In other embodiments, For example, in the embodiment shown in FIG. 5 , the outer bracket 3 includes a plurality of support parts 31 arranged at intervals and surrounding the outside of the body 2 . Each support part 31 is connected to the body 2 through at least one elastic arm 5 . In this embodiment, For example, the inner surfaces of the multiple support portions 31 can be extended to fit the inner peripheral surface 30 of the annular outer bracket 3 , and the multiple support portions 31 can be regarded as the remaining portions of the outer bracket 3 after cutting off a number of notches 32 .

In order to make the force on the main body 2 more balanced when it vibrates, the spacing space 4 is in the shape of a ring of equal width. Furthermore, the elastic piece 7 is preferably a rotationally symmetrical structure so that the main body 2 can vibrate along its central axis 20. Not prone to deflection. When the elastic piece 7 is placed horizontally, the central axis 20 of the body 2 passes through the center of the body 2 and is parallel to the vertical line. Under ideal circumstances, the vibration axis of the vibration component of the bone conduction sound-generating device coincides with the central axis 20 .

The elastic arm 5 is arranged in the separation space 4 and is connected between the body 2 and the outer bracket 3. The elastic arm 5 protrudes toward one side of the elastic piece relative to the body 2 and the outer bracket 3. As shown in Figure 4, the elastic arm 5 faces toward The upper part of the elastic arm 5 is convex, and at least part of the elastic arm 5 is higher than the body 2 and the outer bracket 3 , and a depression is formed below the elastic arm 5 .

As shown in Figures 7 and 8, Figures 7 and 8 show a bone conduction sound device using the above-mentioned elastic piece 7. When the elastic piece 7 is installed on the bone conduction sound device, its elastic arm 5 is directed away from the vibration component. The direction of 81 is protruding, so that the distance between the vibration component 81 and the elastic arm 5 is farther, and the possibility of contact between the two is greatly reduced, which is helpful to prevent the vibration component 81 from being hit during vibration, accidental drop, or reliability testing. The elastic arm 5 is conducive to preventing noise, improving the acoustic quality of the product, and is conducive to successfully passing the reliability test. In this way, the amplitude of the vibration component 81 can also be designed to be larger, thereby reducing the vibration frequency F0 and improving the low-frequency effect.

The cross-sectional profile of the elastic arm 5 is convex along the direction of the central axis 20 of the body 2. The cross-section is a cross-section obtained by cutting the elastic arm 5 with a cross-section passing through the width direction of the separation space 4 and parallel or coincident with the central axis 20. For the annular separation space 4 , its width direction is the same as its diameter direction, and the cross-sectional plane is a plane passing through the central axis 20 of the body 2 . As shown in Figures 3 and 4, Figure 3 is a top view of an elastic piece 7 with an annular space 4. The cross-sectional view of the elastic piece 7 is taken along the section plane A-A passing through the central axis 20. Figure 4 shows the elastic arm. The cross-sectional profile of 5 is convex upward.

As a preferred embodiment, the elastic arm 5 is connected between the inner peripheral surface 30 of the outer bracket 3 and the outer peripheral surface 21 of the body 2, and has a first end 50 connected to the inner peripheral surface 30 and a first end 50 connected to the outer peripheral surface 21. The second end 51 of the elastic arm 5 preferably has an arc transition between the first end 50 and the second end 51 and other parts of the elastic arm 5 to reduce stress concentration.

In some embodiments, the elastic arm 5 protrudes upward from the connection between the main body 2 and the outer bracket 3. In other embodiments, the connection part between the elastic arm 5 and the main body 2 and/or the outer bracket 3 first extends horizontally and then Raised upward. In some embodiments, the portion connecting the outer bracket 3 and the elastic arm 5 is tilted upward, so that it and the elastic arm 5 can obtain a greater protruding height, and the transition between the two is smoother.

It can be understood that the shape of the elastic piece 7 is not limited. For example, the elastic piece 7 can be in the shape of a racetrack as shown in Figure 6. In Figure 6, the outer bracket 3 and the separation space 4 are both in the shape of a racetrack. For another example, the shrapnel 7 can be as shown in Figure 2 As shown in the circle, in Figure 2, the outer bracket 3, the body 2 and the separation space 4 are all in the shape of a ring. In addition, the outer contour of the outer bracket 3 may not be consistent with the shape of its inner peripheral surface 30. For example, the outer contour of the outer bracket 3 is rectangular, and its inner peripheral surface 30 corresponds to the shape of the outer peripheral surface 20 of the body 2, both of which are circular. .

The cross-sectional profile of the elastic arm 5 is usually a broken, small section. In order to facilitate the display of the protruding manner of the elastic arm 5, the upper and lower surfaces of the elastic arm 5 can be extended to connect multiple broken sections, and then obtain More intuitive and clear cross-sectional outline shape. For example, in FIGS. 9 and 10 , the extended cross-sectional profile is shown in dotted lines.

The shape of the cross-sectional profile of the elastic arm 5 is not limited, and may include one or more of an arc portion, an inclined portion, and a horizontal portion. In some embodiments, as shown in Figure 9, the cross-sectional profile of the elastic arm 5 includes an arc portion 5c, that is, the cross-sectional profile is a convex arc shape, preferably a circular arc shape. In these embodiments, due to the transition of the elastic arm 5 Smooth, its stress concentration is small, so it is not easy to fatigue fracture and has a better service life. The cross-sectional profile may include only one arc portion 5c with one curvature, or may include multiple arc portions 5c with different curvatures. In other embodiments, as shown in Figure 10, the cross-sectional profile of the elastic arm 5 includes inclined portions 5a on both sides and a horizontal portion 5b connected between the two inclined portions 5a.

As a preferred embodiment, the protrusion heights H of the parts where the elastic arm 5 is at the same distance from the inner circumferential surface 30 of the outer bracket 3 or the outer circumferential surface 21 of the body 2 are the same. For ease of explanation, as shown in Figure 4, the protrusion height H is defined as the distance between the lower surface 57 of the elastic arm 5 and the bottom surface 34 of the outer bracket 3. It can be understood that the protrusion height H can also be determined in other ways. be defined. The part where the elastic arm 5 is at the same distance from the inner peripheral surface 30 of the outer bracket 3 or the outer peripheral surface 21 of the main body 2 can be understood as the elastic arm 5 is located equidistant from the inner peripheral surface 30 of the outer bracket 3 or the outer peripheral surface 21 of the main body 2 The part at the equidistant line 5d, the annular equidistant line 5d is shown as a dotted line in Figures 11 and 12. Since the protruding height H of the elastic arm 5 in the part of the equidistant line 5d is the same, the annular The distance between the elastic arm 5 at the equidistant line 5d and the vibration component 81 is basically the same, and the distance between the elastic arm 5 and the vibration component 81 will not be reduced due to the ups and downs of the part of the elastic arm 5 at the equidistant line 5d. It can be understood that for the elastic piece 7 whose spacing space 4 is annular, the protrusion height H of the part where the elastic arm 5 is at the same distance from the inner circumferential surface 30 of the outer bracket 3 or the outer circumferential surface 21 of the body 2 is also the same. It can be understood that the protruding heights H of the parts at the same distance from the elastic arm 5 to the center O of the body 2 are the same.

As a preferred embodiment, the ratio of the maximum protrusion height H of the elastic arm 5 to the ring width B of the separation space 4 is 0.05 to 0.5. The maximum protrusion height H is the distance between the lower surface 57 of the elastic arm 5 and the bottom surface 34 . The distance between the far point and the bottom surface 34. The greater the ratio between the maximum protrusion height H and the ring width B, the elastic arm 5 The greater the deformation, the greater the processing difficulty, the lower the dimensional accuracy, and the lower the reliability due to the plastic deformation of the metal. It is further preferred that the ratio of the maximum protrusion height H to the ring width B of the separation space 4 is set to 0.12 to 0.3, which can ensure the distance between the elastic arm 5 and the vibration component 81 while making the elastic arm 5 have good Reliable and easy to process.

It can be understood that the shape of the elastic arm 5 is not limited, and possible shapes of the elastic arm 5 are introduced below using three specific embodiments.

Example 1

As shown in Figures 13 to 15, in this embodiment, the elastic piece 7 is a circular elastic piece, and the outer bracket 3 and the spacing space 4 are both circular.

The elastic piece 7 has three elastic arms 5 arranged at equal angles, and the elastic arms 5 are generally in the shape of an arc-shaped strip. They extend from the inner peripheral surface 30 of the outer bracket 3 along an arc to the outer peripheral surface 21 of the body 2, and Connected to the outer peripheral surface 21 of the body 2 .

In order to make the elastic arm 5 have a larger length, increase the amplitude of the body 2, reduce the vibration frequency F0, and improve the low-frequency effect, two adjacent elastic arms 5 are partially arranged oppositely. Further, as shown in FIG. 14 , the connection between the first end 50 and the inner peripheral surface 30 forms a first boundary line 33 , the connection between the second end 51 and the outer peripheral surface 21 forms a second boundary line 22 , and the body 2 The center O of the body 2 and the midpoint of the first boundary line 33 form the first reference line 6. The center O of the body 2 and the midpoint of the second boundary line 22 form the second reference line 60. The first reference line 6 and the second reference line The absolute value of the angle E between 60 and 60 is greater than 180°, and the angle E is the angle toward the side where the elastic arm 5 is located.

Example 2

The difference between this embodiment and Embodiment 1 is that the elastic arm 5 in this embodiment is different from the elastic arm 5 in Embodiment 1. Specifically, the elastic arm 5 in Embodiment 2 has at least one folded portion, so that, The length of the elastic arm 5 is longer, which can effectively increase the amplitude, reduce the vibration frequency F0, and improve the low-frequency effect.

As shown in FIGS. 2 to 4 , the elastic arm 5 includes a first arm 52 connected to the first end 50 , a second arm 53 connected to the second end 51 , and a second arm 52 located between the first arm 52 and the second arm 53 . The third arm portion 54 between the arm portions 53, the elastic arm 5 also includes two folding portions, which are the first folding portion 55 connecting the first arm portion 52 and the second arm portion 53, and the first folding portion 55 connecting the second arm portion 53 and the second arm portion 53. The second folded portion 56 of the third arm portion 54 .

Obviously, since two folding parts are provided, there are parts of the first arm part 52 and the third arm part 54 and between the second arm part 53 and the third arm part 54 that are relatively arranged, which can be more sufficient. Utilization The spacing space 4 significantly increases the length of the elastic arm 5.

Referring to Figure 3, as a preferred embodiment, the tangent points between the center O of the body 2 and the outer contours of the adjacent first and second folding portions 55 and 56 form a third reference line 61 and a fourth reference line 62. , the angle F between the third reference line 61 and the fourth reference line 62 is 1 to 70°, more preferably 3 to 15°, for example, it may be 12°. Setting the included angle F to 3 to 15° can make full use of the separation space 4 and increase the length of the elastic arm 5 to reduce the resonant frequency of the vibration system if the processing technology allows.

As a preferred embodiment, as shown in FIG. 3 , the center O of the body 2 and the midpoint of the first boundary line 33 form the first reference line 6 , and the center O of the body 2 and the midpoint of the second boundary line 22 form the first reference line 6 . The absolute value of the angle E between the second reference line 60, the first reference line 6 and the second reference line 60 is not greater than 100 degrees, for example, it can be 98°. It is further preferred that the first reference line 6 and the second reference line The absolute value of the angle E between 60 degrees is not greater than 60 degrees, for example, it can be 58 degrees.

Example 3

As shown in Figures 6 and 12, in this embodiment, the elastic piece 7 is a track-shaped elastic piece, its outer bracket 3 and the separation space 4 are both in the shape of a track-shaped ring, and its elastic arm 5 is provided with a folding portion.

The present invention also proposes a bone conduction sound-generating device, which includes the elastic piece 7 mentioned above.

As shown in FIGS. 7 and 8 , the bone conduction sound-generating device also includes a housing 8 , a coil assembly 80 and a vibration assembly 81 . The coil component 80 drives the vibration component 81 to vibrate through the magnetic field generated by energization.

At least one end of the shell 8 is open, and the elastic piece 7 is arranged at the open end of the outer bracket 3. Specifically, the outer bracket 3 is connected to the end of the shell 8, and the two are fixedly connected, while the elastic arm 5 and the body 2 are suspended. The vibration component 81 is connected to the body 2 , and the elastic arm 5 protrudes toward the outside of the housing 8 to increase the distance from the vibration component 81 .

The coil assembly 80 includes a magnetically conductive plate 800 , a coil 801 and a first magnet 802 . In the embodiment shown in FIG. 8 , the housing 8 is open at both ends and is cylindrical. The magnetic conductive plate 800 and the elastic piece 7 are respectively connected to the two open ends of the housing 8 to cover the openings at both ends of the housing 8 . The coil 81 and the first magnet 802 are both connected to the magnetic conductive plate 800, where the first magnet 802 is disposed in the coil 801.

The vibration component 81 includes a magnetically conductive bowl 810 connected to the body 2 of the spring piece 7 and a second magnet 811 located in the magnetically conductive bowl 810. The magnetically conductive bowl 810 opens downward, so that the end surface of the second magnet 811 is exposed to the magnetically conductive bowl 810. Bowl 810. The first magnet 802 and the second magnet 811 are made of magnetic materials, such as magnets, magnetic steel, etc. The first magnet 802 and the second magnet 811 are arranged opposite to each other with the same pole, and a repulsive magnetic force is generated between them.

The magnetically conductive plate 800 and the magnetically conductive bowl 810 are made of magnetically conductive materials. They can be attracted by magnetic force. A first magnetic attraction force is formed between the first magnet 802 and the magnetically conductive bowl 810. The second magnet 811 and the magnetically conductive plate 800 form a first magnetic attraction force. A second magnetic attraction is formed between them. As a preferred embodiment, the resultant force of the first magnetic attraction force and the second magnetic attraction force is equal to the repulsive force between the two magnets and opposite in direction, so that a static balance is formed between the vibration component 81 and the coil component 80 , so that It is beneficial to improve the vibration performance and sensitivity of the vibration component 2. After the coil 801 is energized, it generates a changing magnetic field, and the vibration component 81 vibrates up and down along the vibration axis under the action of the magnetic field.

The shell 8 and the elastic piece 7 are made of non-magnetic conductive materials or materials with weak magnetic conductive materials to reduce the impact on the magnetic force. For example, the housing 8 can be made of plastic, and the elastic member 70 can be made of non-magnetic stainless steel.

In a preferred embodiment, the magnetically conductive bowl 810 of the vibration assembly 81 is directly connected to the body 2 , and the distance between the elastic arm 5 and the magnetically conductive bowl 810 provides a vibration space to prevent the magnetically conductive bowl 810 from contacting the elastic arm 5 , in another preferred embodiment, the vibration assembly 81 also includes a spacer 812 connected between the magnetic bowl 810 and the body 2. The outer edge of the spacer 812 does not exceed the outer edge of the magnetic bowl 810. By setting The spacer 812 can further increase the distance between the elastic arm 5 and the magnetic bowl 810, thereby improving the reliability of the bone conduction sound-generating device. Preferably, the outer edge of the spacer 812 does not exceed the position corresponding to the highest point of the elastic arm 5 in the horizontal direction. Further preferably, the outer edge of the spacer 812 does not exceed the outer peripheral surface 21 of the body 2 .

As a preferred embodiment, the outer edge of the end surface 815 of the magnetic bowl 810 facing the elastic piece 7 is provided with a rounded corner 813. Since the part of the elastic arm 5 close to the body 2 will move with the movement of the body 2, the magnetic bowl 810 is provided with a rounded corner 813. 810 is more likely to come into contact with the outer edge of the elastic arm 5. Therefore, providing a rounded corner 813 on the magnetic bowl 810 can conveniently increase the distance between the outer edge of the magnetic bowl 810 and the elastic arm 5, and greatly reduce the diameter of the magnetic bowl. The risk of collision between 810 and the elastic arm 5 is conducive to increasing the amplitude, reducing the vibration frequency F0, and improving the low-frequency acoustic effect.

The present invention also proposes a bone conduction earphone, which includes the elastic piece or bone conduction sound device described above.

Referring to FIG. 16 , FIG. 16 shows a cross-sectional view of an earphone head of a bone conduction earphone according to an embodiment. The bone conduction earphone includes a shell 9 with an open end and an end cap 90 connected to the opening of the shell 9 . The end cap 90 The opening of the housing 9 is sealed, and a receiving cavity 92 for accommodating the bone conduction sound-generating device 91 is formed between the two. shell The bottom of the body 9 is provided with a support seat 93 that extends toward the end cover 90 . The end cover 90 is also provided with a contact member 94 that extends toward the receiving cavity 92 . The upper end of the bone conduction sound-generating device 91 abuts the contact member 94 , and the lower end contacts the support member 94 . The seat 93 is against each other and is clamped between the abutment piece 94 and the end cover 90. After the bone conduction sound-generating device 91 vibrates, it drives the end cover 90 to vibrate. The end cover 90 fits the skin of the human skull and can transmit the vibration to The skull realizes bone conduction sound transmission.

As a preferred embodiment, a flexible layer is provided between the support base 93 and the bone conduction sound device 91. The material of the flexible layer can be sponge, foam, silica gel, etc., and the flexible layer reduces the transmission of the bone conduction sound device 91 to The vibration of the housing 9 can reduce the sound leakage caused by the vibration of the housing 9 .

The above are only specific embodiments of the present invention, and any other improvements made based on the concept of the present invention are deemed to be within the protection scope of the present invention.

Claims

A kind of shrapnel, which is characterized by including:

Ontology(2);

An outer bracket (3) is provided outside the body (2), and a separation space (4) is formed between the body (2) and the outer bracket (3); and,

An elastic arm (5) is located in the separation space (4) and connected between the main body (2) and the outer bracket (3). The elastic arm (5) is opposite to the main body (2). ) and the outer bracket (3) protrude toward one side of the elastic piece.
The elastic piece according to claim 1, characterized in that the cross-sectional profile of the elastic arm (5) is convex along the direction of the central axis (20) of the body (2), and the cross-sectional profile includes an arc portion (5c ), one or more of the inclined portion (5a) and the horizontal portion (5b).
The spring piece according to claim 2, characterized in that one end of the elastic arm (5) is connected to the inner peripheral surface (30) of the outer bracket (3), and the other end is connected to the outer peripheral surface of the body (2). (21) are connected together, and the protruding heights of the parts of the elastic arm (5) that are the same distance from the inner circumferential surface (30) or the outer circumferential surface (21) are the same.
The elastic piece according to claim 1, characterized in that the separation space (4) is annular, and the ratio range of the maximum protruding height of the elastic arm (5) to the ring width of the separation space (4) is 0.05～0.5.
The elastic piece according to any one of claims 1 to 4, characterized in that the separation space (4) is annular, the elastic piece includes three elastic arms (5), and the elastic arms (5) ) includes a first end (50) connected to the inner peripheral surface (30) of the outer bracket (3) and a second end (51) connected to the outer peripheral surface (21) of the body (2), The connection between the first end (50) and the inner peripheral surface (30) forms a first boundary line (33), and the connection between the second end (51) and the outer peripheral surface (21) A second boundary line (22) is formed. The center O of the body (2) and the midpoint of the first boundary line (33) form a first reference line (6). The center O of the body (2) and the midpoint of the first boundary line (33) form a first reference line (6). The midpoint of the second boundary line (22) forms a second reference line (60), and the absolute value of the angle between the first reference line (6) and the second reference line (60) is greater than 180°. , the included angle is the included angle toward the side where the corresponding elastic arm (5) is located.
The elastic piece according to any one of claims 1 to 4, characterized in that the separation space (4) is annular, and the elastic arm (5) includes an inner peripheral surface connected with the outer bracket (3). (30) The first end (50) connected to the second end (51) connected to the outer peripheral surface (21) of the body (2), the elastic arm (5) is located at the first end The portion between (50) and the second end (51) includes at least one folded portion.
The elastic piece according to claim 6, characterized in that the elastic arm (5) includes a first arm portion (52) connected to the first end portion (50), and a first arm portion (52) connected to the second end portion (51). ) connected to the second arm part (53) and the third arm part (54) located between the first arm part (52) and the second arm part (53), the elastic arm (5) also It includes a first folding part (55) connecting the first arm part (52) and the second arm part (53) and a first folding part (55) connecting the second arm part (53) and the third arm part (54). The second turning part (56).
The elastic piece according to claim 7, characterized in that it includes three elastic arms (5), and the connection between the first end (50) and the inner peripheral surface (30) forms a first junction. Line (33), the connection between the second end (51) and the outer peripheral surface (21) forms a second boundary line (22), the center O of the body (2) and the first boundary line The midpoint of (33) forms the first reference line (6), and the midpoint of the center O of the body (2) and the second boundary line (22) forms the second reference line (60). The absolute value of the angle between the reference line (6) and the second reference line (60) is not greater than 100 degrees.
The elastic piece according to claim 7, characterized in that the tangent point between the center O of the body (2) and the outer contours of the adjacent first folding portion (55) and the second folding portion (56) is formed. A third reference line (61) and a fourth reference line (62). The angle between the third reference line (61) and the fourth reference line (62) is 1 to 70°.
A bone conduction sound-generating device, characterized by comprising the elastic piece (7) according to any one of claims 1 to 9.
The bone conduction sound-generating device according to claim 10, characterized in that it further includes:

Shell (8), the outer bracket (3) of the elastic piece (7) is connected to the shell (8); and,

A vibration component (81) is connected to the body (2) of the elastic piece (7). The vibration assembly (81) is used to vibrate in the housing (8). The elastic arm (5) of the elastic piece (7) ) protrudes away from the vibration component (81).
The bone conduction sound-generating device according to claim 11, characterized in that it further includes a coil assembly (80) fixed relatively to the housing (8), and the coil assembly (80) is used to drive the vibration assembly (80). 81) Vibration.
The bone conduction sound-generating device according to claim 12, characterized in that the coil assembly (80) includes a magnetic conductive plate (800) connected to the housing (8), and The connected coil (801) and the first magnet (802), the first magnet (802) is provided in the coil (801);

The vibration component (81) includes a magnetic conductive bowl (810) connected to the body (2) of the elastic piece (7) and a second magnet (811) provided in the magnetic conductive bowl (810). The first magnet (802) and the second magnet (811) are relatively spaced apart and have the same poles facing each other. The elastic arm (5) of the elastic piece (7) faces away from the magnetic bowl (81). raised in the direction.
The bone conduction sound-generating device according to claim 13, characterized in that the vibration component (81) further includes a spacer (812) connected between the body (2) and the magnetic conductive bowl (810). , the magnetic bowl (810) is provided with a rounded corner (813) toward the outer edge of the end surface of the elastic piece (7).
A bone conduction earphone, characterized by comprising the elastic piece (7) according to any one of claims 1 to 9 or the bone conduction sound-generating device according to any one of claims 10 to 14.