A bone conduction sound generating device and a wearable device

Abstract

The present invention discloses a bone conduction sound-generating device and a wearable device, wherein the bone conduction sound-generating device includes an external packaging structure, a hollow cavity disposed within the external packaging structure, and a hollow spring; an exciter, the exciter including an upper magnetic member and a lower magnetic member, the upper and lower magnetic members being arranged parallel to each other in the Z-axis direction with a gap therebetween to form an isolation zone; and a spatial low-frequency adjustment plate disposed between the hollow spring and the exciter. The spatial low-frequency adjustment plate adjusts the structural stacking of the hollow spring and the exciter in the Z-axis direction and adjusts the gap in the isolation zone. The hollow spring and the spatial low-frequency adjustment plate cooperate to adjust the effective vibration area of ​​the hollow spring to adjust the resonant frequency of the device. A wearable device equipped with the bone conduction sound-generating device can transmit low-frequency signals with moderate transmission amplitude, balance the entire sound frequency band, achieve good acoustic effects, and significantly improve user experience and product sound quality.

Description

Technical Field

[0001] The present invention relates to the technical field of bone conduction sound generation, and in particular to a bone conduction sound generation device and a wearable device. Background Art

[0002] Bone conduction is a method of sound transmission that converts sound into mechanical vibrations of varying frequencies, transmitting these waves through the skull, bony labyrinth, inner ear lymph, the augumentary organ, and the auditory center. Compared to traditional sound transmission methods that generate sound waves through the acoustic membrane, bone conduction eliminates many of the necessary steps, enabling clear sound reproduction in noisy environments without disturbing others by dispersing the sound waves through the air.

[0003] Bone conduction headphones use bone conduction technology to transmit sound waves, unlike standard in-ear headphones. Sound waves are transmitted directly to the auditory nerve through the bones, rather than through the eardrum. This improves comfort, protects hearing, and allows users to clearly hear external sounds. These unique advantages are undeniable. However, existing bone conduction headphones have the following drawbacks:

[0004] The bone conduction sound generators used in existing bone conduction headphones generate large vibration amplitudes when transmitting low-frequency signals, resulting in a strong sense of vibration during use, which affects the user experience. Therefore, to overcome this drawback, in actual use, headphones directly block low-frequency signals. While this reduces the vibration, the sound transmitted to the ear lacks bass, resulting in poor sound quality, which also affects the user experience. Therefore, it is of great significance to research a bone conduction sound generator that can enrich low-frequency content and improve low-frequency sound quality and effects. Summary of the Invention

[0005] The purpose of the present invention is to provide a bone conduction sound-generating device and a wearable device that can transmit low-frequency signals with moderate amplitude and balance the entire sound frequency band.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A bone conduction sound-generating device includes an external packaging structure, wherein a hollow cavity is provided in the external packaging structure, and wherein the hollow cavity contains:

[0008] Hollow shrapnel;

[0009] An actuator, the actuator comprising an upper magnetic member and a lower magnetic member, the upper magnetic member and the lower magnetic member being arranged parallel to each other in the Z-axis direction with a gap therebetween to form an isolation zone;

[0010] A spatial low-frequency adjustment plate is arranged between the hollow spring piece and the exciter. The spatial low-frequency adjustment plate adjusts the structural stacking of the hollow spring piece and the exciter in the Z-axis direction, and adjusts the gap of the isolation zone to adjust the resonant frequency point of the device.

[0011] Preferably, the magnetic flux of the lower magnetic part is less than or equal to the magnetic flux of the upper magnetic part, and the exciter also includes an upper magnetic bowl for accommodating the upper magnetic part and a lower magnetic bowl for accommodating the lower magnetic part. The upper magnetic part and the lower magnetic part are arranged opposite to each other with the same poles. When the power is not supplied, the repulsive force between the upper magnetic part and the lower magnetic part is equal to the attractive force between the upper magnetic part and the lower magnetic bowl to maintain a static balance of the magnetic force and achieve the best fidelity effect.

[0012] Preferably, the exciter further comprises a coil, which is installed in the lower magnetic bowl and arranged around the lower magnetic member.

[0013] Preferably, the exciter further comprises a flexible circuit board, which is arranged between the coil and the lower magnetic bowl, one end of the flexible circuit board is connected to the coil, and the other end extends outside the external packaging structure.

[0014] Preferably, the lower magnetic bowl is installed at the bottom of the hollow cavity, and the upper magnetic bowl is connected to the spatial low-frequency adjustment plate.

[0015] Preferably, the bottom surface area of ​​the lower magnetic bowl is greater than or equal to the bottom surface area of ​​the upper magnetic bowl.

[0016] Preferably, the upper magnetic part includes at least one magnet and / or the lower magnetic part includes at least one magnet.

[0017] Preferably, the isolation area is filled with one or more of air, damping material, and elastic member.

[0018] Preferably, the hollow spring piece includes an inner spring piece, an outer spring piece and a plurality of connecting spring pieces connected between the inner spring piece and the outer spring piece. The inner spring piece is installed on the spatial low-frequency adjustment board, and the outer spring piece is installed on the external packaging structure.

[0019] Preferably, the external packaging structure includes a shell and a cover plate covering the shell, and the hollow spring sheet is embedded in the shell and arranged opposite to the cover plate.

[0020] Preferably, the distance between the cover plate and the hollow spring piece is greater than the maximum working vibration displacement of the hollow spring piece.

[0021] On the other hand, the present invention also provides a wearable device comprising the above-mentioned bone conduction sound generating device.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The present invention sets a spatial low-frequency adjustment plate before the hollow spring piece and the exciter, and adjusts the effective vibration area of ​​the hollow spring piece through the cooperation between the hollow spring piece and the spatial low-frequency adjustment plate to adjust the resonance frequency point of the device. At the same time, the spatial low-frequency adjustment plate adjusts the structural stacking of the hollow spring piece and the exciter in the Z-axis direction, and adjusts the gap in the isolation area, so that the amplitude of the sound signal transmitted by the sound-emitting device is moderate, and the bass part can be synchronously transmitted to the ear canal, balancing the entire sound frequency band, achieving a better acoustic effect, and significantly improving the user experience and product sound quality.

[0024] (2) The exciter uses two upper and lower magnetic parts with the same polarity arranged opposite to each other to achieve static balance between the components by fully utilizing magnetic balance. No additional support structure is required. The structure is simple, easy to implement, and reduces production costs.

[0025] (3) The external packaging structure enhances the strength of the entire device by covering it with a cover plate, and at the same time has a good sound insulation effect, effectively preventing the occurrence of sound leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention, and do not specifically limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the specific circumstances under the guidance of the present invention. In the drawings:

[0027] Figure 1 is an exploded view of the bone conduction sound generating device of the present invention;

[0028] Figure 2 is a cross-sectional view of the bone conduction sound generating device of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the hollow shrapnel in the present invention;

[0030] Figure 4 It is a structural schematic diagram of the upper magnetic component in an embodiment of the present invention.

[0031] As shown in the figure:

[0032] 11. Hollow cavity; 12. Outer shell; 13. Cover plate; 14. Mounting slot; 2. Hollow spring clip; 21. Inner spring clip; 22. Outer spring clip; 23. Connecting spring clip; 3. Spatial low-frequency adjustment plate; 41. Upper magnetic part; 41a. First magnet; 41b. Second magnet; 42. Lower magnetic part; 43. Isolation area; 44. Upper magnetic bowl; 45. Lower magnetic bowl; 46. Coil; 47. Flexible circuit board. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0034] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] like Figure 1 and Figure 2As shown, a bone conduction sound-generating device corresponding to a preferred embodiment of the present invention includes an external packaging structure, a hollow spring piece 2, a spatial low-frequency adjustment plate 3, and an exciter. A hollow cavity 11 is provided in the external packaging structure, and the hollow spring piece 2, the spatial low-frequency adjustment plate 3, and the exciter are arranged in the hollow cavity 11. The exciter drives the hollow spring piece 2 to vibrate. The exciter includes an upper magnetic part 41 and a lower magnetic part 42. The upper magnetic part 41 and the lower magnetic part 42 are arranged parallel to each other in the Z-axis direction, and there is a gap to form an isolation area 43; the spatial low-frequency adjustment plate 3 is arranged between the hollow spring piece 2 and the exciter. The spatial low-frequency adjustment plate 3 adjusts the structural stacking of the hollow spring piece 2 and the exciter in the Z-axis direction, and adjusts the gap in the isolation area 43. The hollow spring piece and the spatial low-frequency adjustment plate cooperate to adjust the effective vibration area of ​​the hollow spring piece to adjust the resonant frequency point of the device.

[0037] Furthermore, the exciter also includes an upper magnetic bowl 44 for accommodating the upper magnetic part 41, a lower magnetic bowl 45 for accommodating the lower magnetic part 42, a coil 46 installed in the lower magnetic bowl 45 and arranged around the lower magnetic part 42, and a flexible circuit board 47 arranged between the coil 46 and the lower magnetic bowl 45. The upper magnetic bowl 44 is connected to the spatial low-frequency adjustment plate 3, and the lower magnetic bowl 45 is installed at the bottom of the hollow cavity 11. Specifically, the upper magnetic part 41 is installed in the upper magnetic bowl 44. After being energized, the coil 46 generates different magnetic fields and cooperates with the upper magnetic part 41 to provide driving force for the vibration of the hollow spring piece 2. There is no gap between the two or there is only assembly space. Compared with traditional exciters, there is no need to reserve space for inserting the voice coil, which reduces the volume of the entire sound-generating device. The upper magnetic part 41 includes at least one magnet, which can be a whole magnet or a plurality of magnets stacked and spliced. As Figure 4As shown, in a preferred embodiment, the upper magnetic part 41 includes two magnets, namely a first magnet 41a and a second magnet 41b surrounding the first magnet 41a. The lower magnetic part 42 is installed in the lower magnetic bowl 45. The repulsive force between the upper magnetic part 41 and the lower magnetic part 42 offsets the attractive force between the upper magnetic part 41 and the lower magnetic bowl 45, so that the exciter is in a magnetic static balance when not powered, avoiding the hollow spring piece 2 from generating internal stress. The lower magnetic part 42 includes at least one magnet, which can be a whole magnet or a plurality of magnets stacked and spliced. The coil 46 is installed in the lower magnetic bowl 45 and is arranged around the lower magnetic part 42. Preferably, the hollow area of ​​the coil 46 is less than or equal to the area of ​​the upper magnetic part 41 corresponding to the coil 46, the area of ​​the lower magnetic part 42 is less than the area of ​​the hollow part of the coil 46, the surface area of ​​the bottom of the lower magnetic bowl 45 is greater than or equal to the surface area of ​​the bottom of the upper magnetic bowl 41, and the magnetic flux of the lower magnetic part 42 is less than or equal to the magnetic flux of the upper magnetic part 41. The magnetic flux here can be changed by changing the volume or material of the magnetic part. The flexible circuit board 47 is arranged between the coil 46 and the lower magnetic bowl 45, one end of which is connected to the coil 46, and the other end extends to the outside through the lower magnetic bowl 45 and the shell 12 to connect to the terminal device. The upper magnetic part 41 and the lower magnetic part 42 are arranged opposite to each other with the same poles. When the power is not supplied, the repulsive force between the upper magnetic part 41 and the lower magnetic part 42 is equal to the attractive force between the upper magnetic part 41 and the lower magnetic bowl 45 to achieve a static balance of magnetic force, thereby avoiding the generation of internal stress in the hollow spring piece 2 and achieving the best fidelity effect. When coil 46 is energized, the static magnetic balance is disrupted, causing upper magnetic bowl 44 or lower magnetic bowl 45 mounted on hollow spring 2 to move up and down, driving hollow spring 2 to vibrate up and down. It is worth noting that regardless of the up and down movement of upper magnetic bowl 44 or lower magnetic bowl 45, the isolation zone 43 between upper magnetic member 41 and lower magnetic member 42 remains in place. That is, when upper magnetic bowl 44 or lower magnetic bowl 45 achieves its maximum downward vibration amplitude, upper magnetic member 41 will not come into contact with lower magnetic member 42 or coil 46, hindering its movement.

[0038] The spatial low-frequency adjustment plate 3 is connected between the hollow spring piece 2 and the upper magnetic bowl 44. This allows the hollow spring piece 2 to be attached to the upper magnetic bowl 44 in an incomplete manner, allowing for flexible adjustment of the Z-axis stacking structure, while also adjusting the size of the isolation zone between the upper magnetic member 41 and the lower magnetic member 42. The hollow spring piece 2 and the spatial low-frequency adjustment plate 3 cooperate to adjust the effective vibration area of ​​the hollow spring piece 2, thereby adjusting the resonant frequency point of the device. Specifically, while the overall size, thickness, and material of the hollow spring 2 remain unchanged, the length, width, and area of ​​the inner spring 21 are changed, thereby changing the length and area of ​​the connecting spring 23 between the inner spring 21 and the outer spring 22. The length and area of ​​the connecting spring 23 are the effective vibration area of ​​the hollow spring, thereby changing the resonant frequency point F0 of the system and flexibly adjusting the low-frequency effect. The resonant frequency point can reach as low as 80Hz. At the same time, the spatial low-frequency adjustment plate 3 changes with the change in the length, width, and area of ​​the inner spring 21. Since the change in F0 will cause the amplitude to change, the height of the adjustment plate also needs to be adjusted accordingly to complete the Z-direction stacking of the hollow spring 2 and the upper magnetic bowl 44. The isolation area 43 is filled with one or more of air, damping material, and other elastic members, which can be magnetic fluid, foam, spring, etc.

[0039] like Figure 3 As shown, the hollow spring piece 2 includes an inner spring piece 21, an outer spring piece 22 and a plurality of connecting spring pieces 23 connected between the inner spring piece 21 and the outer spring piece 22. The size of the inner spring piece 21 is equal to that of the spatial low-frequency adjustment plate 3 and is installed on the spatial low-frequency adjustment plate 3, and the outer spring piece 22 is installed on the external packaging structure. Specifically, the external packaging structure includes an outer shell 12 and a cover plate 13 covered on the outer shell 12. The hollow spring piece 2 is embedded in the outer shell 12 and is arranged opposite to the cover plate 13. In order to further better fix the hollow spring piece 2, the outer shell 12 is provided with a mounting groove 14 at the open end of the hollow cavity 11. The hollow spring piece 2 is embedded in the mounting groove 14, that is, the outer spring piece 22 is installed in the mounting groove, the inner spring piece 21 is installed on the spatial low-frequency adjustment plate 3, and the connecting spring piece 23 is always separated from the upper magnetic bowl 44 to ensure that the hollow spring piece 2 can generate vibration.

[0040] To further ensure the strength and sound insulation of the entire sound-generating device, a cover plate 13 is placed over the mounting slot 14, cooperating with the mounting slot 14 and enclosing the hollow cavity 11. The cover plate 13 is preferably made of metal, which has good rigidity and is non-deformable. The distance between the cover plate 13 and the hollow spring 2 is greater than the maximum working vibration displacement of the hollow spring 2, ensuring normal vibration.

[0041] An embodiment of the present invention also provides a wearable device equipped with the above-mentioned bone conduction sound-generating device. The wearable device can be headphones, wearable glasses, AR, MR, etc., which can transmit low-frequency signals with moderate amplitude and balance the entire sound frequency band.

[0042] The present invention provides a bone conduction sound-generating device and a wearable device. A spatial low-frequency adjustment plate is provided between a hollow spring and an exciter. The spatial low-frequency adjustment plate is used to adjust the stacking of the hollow spring and the exciter in the Z-axis direction, and the gap in the isolation zone is adjusted to adjust the resonant frequency of the device. This ensures that the amplitude of the sound signal transmitted by the sound-generating device is moderate, while the bass portion can be synchronously transmitted to the ear canal, balancing the entire audio frequency band and achieving a good acoustic effect, significantly improving the user experience and product sound quality. The exciter utilizes two upper and lower magnetic members with opposite polarities to achieve static balance between the components, completely utilizing magnetic force balance. This eliminates the need for additional support structures, resulting in a simple structure, easy implementation, and reduced production costs. The external packaging structure, by providing a cover plate, enhances the strength of the entire device while providing good sound insulation and effectively preventing sound leakage.

[0043] It should be understood that the above description is for illustrative purposes only and is not intended to be limiting. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A bone conduction sound device, comprising an external packaging structure, wherein a hollow cavity is provided in the external packaging structure, characterized in that: The hollow cavity is provided with: Hollow shrapnel; An actuator, the actuator comprising an upper magnetic member and a lower magnetic member, the upper magnetic member and the lower magnetic member being arranged parallel to each other in the Z-axis direction with a gap therebetween to form an isolation zone; A spatial low-frequency adjustment plate, disposed between the hollow spring piece and the exciter, adjusts the structural stacking of the hollow spring piece and the exciter in the Z-axis direction and adjusts the gap in the isolation zone. The hollow spring piece and the spatial low-frequency adjustment plate cooperate to adjust the effective vibration area of ​​the hollow spring piece to adjust the resonant frequency point of the device; The magnetic flux of the lower magnetic member is less than or equal to the magnetic flux of the upper magnetic member, and the exciter further comprises an upper magnetic bowl for accommodating the upper magnetic member and a lower magnetic bowl for accommodating the lower magnetic member, wherein the upper magnetic member and the lower magnetic member are arranged opposite to each other with the same poles; The spatial low-frequency adjustment plate is connected between the hollow spring piece and the upper magnetic bowl; The hollow spring piece includes an inner spring piece, an outer spring piece, and a plurality of connecting spring pieces connected between the inner spring piece and the outer spring piece, the inner spring piece is mounted on the spatial low-frequency adjustment board, and the outer spring piece is mounted on the external packaging structure; The effective vibration area of ​​the hollow spring piece is adjusted by adjusting the area of ​​the connecting spring piece to adjust the resonant frequency point of the device.

2. The bone conduction sound generating device according to claim 1, characterized in that: When not powered on, the repulsive force between the upper magnetic member and the lower magnetic member is equal to the attractive force between the upper magnetic member and the lower magnetic bowl to maintain a static balance of magnetic forces and achieve an optimal fidelity effect.

3. The bone conduction sound generating device according to claim 2, characterized in that: The exciter further includes a coil, which is installed in the lower magnetic bowl and arranged around the lower magnetic member.

4. The bone conduction sound generating device according to claim 3, characterized in that: The exciter further includes a flexible circuit board, which is arranged between the coil and the lower magnetic bowl. One end of the flexible circuit board is connected to the coil, and the other end extends outside the external packaging structure.

5. The bone conduction sound generating device according to claim 2, characterized in that: The lower magnetic bowl is installed at the bottom of the hollow cavity, and the upper magnetic bowl is connected to the spatial low-frequency adjustment plate.

6. The bone conduction sound generating device according to claim 2, characterized in that: The bottom surface area of ​​the lower magnetic bowl is greater than or equal to the bottom surface area of ​​the upper magnetic bowl.

7. The bone conduction sound generating device according to claim 1, characterized in that: The upper magnetic part includes at least one magnet and / or the lower magnetic part includes at least one magnet.

8. The bone conduction sound generating device according to claim 1, characterized in that: The isolation area is filled with one or more of air, damping material, and elastic member.

9. The bone conduction sound generating device according to claim 1, characterized in that: The external packaging structure includes a shell and a cover plate covered on the shell, and the hollow spring piece is embedded in the shell and arranged opposite to the cover plate.

10. The bone conduction sound generating device according to claim 9, characterized in that: The distance between the cover plate and the hollow spring piece is greater than the maximum working vibration displacement of the hollow spring piece.

11. A wearable device, characterized in that: A bone conduction sound generating device comprising the bone conduction sound generating device according to any one of claims 1 to 10.

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