Bone conduction earphone structure capable of preventing side sound leakage

Abstract

The utility model discloses a bone conduction earphone structure capable of preventing side sound leakage, which comprises an outer shell, a magnetic circuit assembly, an elastic sheet and a conduction assembly, the outer shell is a cavity internally provided with an accommodating space, the upper wall of the cavity is provided with a sound outlet hole, the magnetic circuit assembly is provided with a magnetic induction voice coil matched with the magnetic circuit assembly, and the elastic sheet is arranged in the magnetic induction voice coil. The magnetic circuit assembly comprises a U-shaped cup, a magnet arranged on the upper wall surface of the U-shaped cup and a washer arranged on the upper wall surface of the magnet, the extension part is provided with a non-magnetic positioning frame, the magnetic induction voice coil is arranged on the lower wall of the elastic piece, the elastic piece is arranged on the upper wall of the positioning frame, the lower wall of the conduction assembly is connected with the elastic piece, and the elastic piece is arranged on the lower wall of the U-shaped cup. The upper wall of the conduction assembly is attached to the top wall of the cavity and is arranged opposite to the sound outlet hole. The relatively closed cavity of the outer shell can prevent the generated vibration wave from being transmitted to the external space of the outer shell when the magnetic circuit assembly and the magnetic induction voice coil work; therefore, the problem of sound leakage of the bone conduction earphone is solved.

Description

Technical Field

[0001] The utility model relates to the field of bone conduction earphones, in particular to a bone conduction earphone structure capable of preventing side sound leakage. Background Art

[0002] Bone conduction is a method of sound transmission that converts sound into mechanical vibrations of varying frequencies, transmitting them through the skull, bony labyrinth, inner ear lymph, the augumentary organ, and the auditory center. Headphones manufactured using this bone conduction technology are called bone conduction headphones, also known as bone conduction headphones, bone-sensing headphones, bone conduction headphones, and bone sensing headphones.

[0003] Existing bone conduction headphones, especially some lower-priced ones, often experience outward sound leakage, a phenomenon known in the acoustics field as sound leakage. This is primarily due to the interaction between the coil and the magnetic circuit assembly, which drives the vibrating element and generates outward sound waves, leading to side sound leakage.

[0004] In actual use, side leakage not only affects the surroundings (such as listening to music in the office area), but also causes privacy leakage, affecting the user experience.

[0005] The existing practice generally adopts a double-bracket structure to concentrate the vibration of the vibration component in a predetermined area to reduce sound leakage, such as Chinese patent CN202320621978.4. However, its structure is relatively complex, and the corresponding accessory and assembly costs are also high. Utility Model Content

[0006] The main purpose of the utility model is to propose a bone conduction earphone structure that prevents side sound leakage, aiming to achieve the prevention of side sound leakage of the bone conduction earphone through a simple structure, while facilitating assembly and effectively reducing production costs.

[0007] To achieve the above-mentioned purpose, the present invention proposes a bone conduction earphone structure for preventing side sound leakage, comprising:

[0008] The outer shell is a cavity with a receiving space inside, and the upper wall of the cavity is provided with a sound outlet (for guiding and focusing sound waves);

[0009] The magnetic circuit assembly is provided with a matching magnetic voice coil, which converts the electrical signal into a vibration frequency of a predetermined frequency.

[0010] The magnetic circuit assembly includes a U cup, a magnet provided on the upper wall of the U cup, and a washer provided on the upper wall of the magnet. An extension portion extends upward from the outer circumference of the U cup, and the extension portion is provided with a non-magnetic positioning frame.

[0011] The spring piece is made of non-magnetic material, the magnetic voice coil is arranged on the lower wall of the spring piece, the spring piece is arranged on the upper wall of the positioning frame, and the spring piece is made of non-magnetic material;

[0012] The conductive component has a lower wall connected to the spring, an upper wall of the conductive component fits the top wall of the cavity, and is arranged opposite to the sound outlet.

[0013] The magnetic circuit assembly generates a predetermined magnetic field and limits the direction of the magnetic field through the U cup, thus creating a magnetic circuit gap between the extension part and the magnetic circuit assembly. When the magnetic voice coil is energized, the magnetic voice coil and the magnetic field of the magnetic circuit assembly are tangent, causing the shrapnel to vibrate at a predetermined frequency, thereby driving the conduction assembly to vibrate at a predetermined frequency, so that the vibration wave is focused at the position of the sound outlet. At the same time, the relatively closed cavity of the outer shell can prevent the vibration waves generated by the magnetic circuit assembly and the magnetic voice coil from being transmitted to the external space of the outer shell when they are working, thereby ensuring the problem of sound leakage in the bone conduction earphones.

[0014] During actual installation, the magnetic circuit assembly, positioning frame, spring and conductive assembly are sequentially installed in the U cup, and finally the upper cover of the shell is installed to complete the assembly. The structure is simple.

[0015] When the outer shell fits the cochlea, the conduction component transmits the vibration waves to the cochlea through the sound outlet, thereby achieving the bundling of the vibration waves, effectively improving the sound quality of the bone conduction headphones and reducing the distortion of bass and treble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the utility model;

[0017] Figure 2 This is an exploded view of the utility model;

[0018] Figure 3 This is a partial exploded view of the conductive component.

[0019] In the figure,

[0020] 1 is the outer shell, 10 is the storage space, 11 is the base, 12 is the upper cover, 13 is the surrounding part, 14 is the sound hole,

[0021] 2 is the magnetic circuit assembly, 21 is the U cup, 22 is the magnet, 23 is the washer, 24 is the extension part, 25 is the positioning frame,

[0022] 3 is a shrapnel, 31 is a ring, 32 is an arm,

[0023] 4 is the magnetic voice coil, 41 is the upper part of the voice coil, 42 is the lower part of the voice coil,

[0024] 5 is a conducting component, 51 is a first positioning seat, 52 is a second positioning seat, 53 is a guide post,

[0025] 6 is the magnetic circuit gap, and 7 is the PCB board. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in 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 are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] like Figures 1 to 3 As shown, a bone conduction earphone structure for preventing side sound leakage includes:

[0030] The outer shell 1 is a cavity with an accommodating space 10 inside, and a sound outlet 14 is provided on the upper wall of the cavity (for guiding and focusing sound waves);

[0031] The magnetic circuit component 2 is provided with a matching magnetic voice coil 4, which converts the electrical signal into a vibration frequency of a predetermined frequency.

[0032] The magnetic circuit assembly 2 includes a U-cup 21, a magnet 22 provided on the upper wall of the U-cup 21, and a washer 23 provided on the upper wall of the magnet 22. An extension portion 24 extends upward from the outer circumference of the U-cup 21, and the extension portion 24 is provided with a non-magnetic positioning frame 25.

[0033] The spring piece 3 is made of non-magnetic material. The magnetic voice coil 4 is arranged on the lower wall of the spring piece 3. The spring piece 3 is arranged on the upper wall of the positioning frame. The spring piece 3 is made of non-magnetic material.

[0034] The conductive component 5 has a lower wall connected to the spring 3 , and an upper wall of the conductive component 5 is in contact with the top wall of the cavity and is arranged opposite to the sound outlet 14 .

[0035] The magnetic circuit assembly 2 generates a predetermined magnetic field and limits the direction of the magnetic field through the U cup 21. Therefore, a magnetic circuit gap 6 is generated between the extension portion 24 and the magnetic circuit assembly 2. When the magnetic induction voice coil 4 is energized, the magnetic induction voice coil 4 is tangent to the magnetic field of the magnetic circuit assembly 2, causing the spring 3 to vibrate at a predetermined frequency, thereby driving the conductive assembly 5 to vibrate at a predetermined frequency, so that the vibration wave is focused at the position of the sound outlet 14. At the same time, the relatively closed cavity of the outer shell 1 can prevent the vibration waves generated by the magnetic circuit assembly 2 and the magnetic induction voice coil 4 from being transmitted to the external space of the outer shell 1 when they are working, thereby ensuring that the bone conduction earphones do not leak sound.

[0036] During actual installation, the magnetic circuit assembly 2, the positioning frame, the spring 3 and the conductive assembly 5 are sequentially installed in the U cup 21, and finally the upper cover 12 of the shell is installed to complete the assembly. The structure is simple.

[0037] When the outer shell 1 fits the cochlea, the conduction component 5 transmits the vibration waves to the cochlea through the sound outlet 14, thereby achieving the bundling of the vibration waves, effectively improving the sound quality of the bone conduction earphones, and reducing the distortion of bass and treble.

[0038] Specifically, a magnetic circuit gap 6 is provided between the extension portion 24 and the magnet 22, and the magnetic voice coil 4 partially extends into the magnetic circuit gap 6. This enables the spring 3 to vibrate at a predetermined frequency, thereby improving the sound quality of the treble and bass.

[0039] In this embodiment of the present invention, the magnetic voice coil 4 includes an upper voice coil portion 41 and a lower voice coil portion 42, with the lower voice coil portion being thicker than the upper voice coil portion 41. The thicker the magnetic voice coil 4, made of wound enameled wire, the greater the current flowing through it, which in turn increases the driving energy between the magnetic voice coil 4 and the magnetic circuit gap 6, thereby improving the sound quality of the bone conduction earphones and reducing distortion.

[0040] Specifically, the spring 3 includes circular rings 31 spaced apart along the same axis and arms 32 connecting two adjacent circular rings 31. The first positioning seat 51 (i.e., the lower end of the conductive component 5) is connected to the innermost circular ring 31, and the magnetic voice coil 4 is connected to the circular ring 31 located in the middle.

[0041] A gap is provided between the lower wall of the spring 3 and the upper wall of the washer 23 , thereby ensuring the predetermined frequency vibration of the conductive component 5 .

[0042] In an embodiment of the present invention, a PCB board 7 is provided on the bottom wall of the U cup 21, and the PCB board 7 is provided with electronic components. The PCB board 7 is provided with a wire connected to the magnetic voice coil 4, thereby facilitating electrical connection. The wire can be provided with a through hole in the U cup 21, pass through a positioning frame or be provided on a spring 3, and then be electrically connected to the magnetic voice coil 4.

[0043] Specifically, the outer shell 1 includes a base 11 with an opening at its upper end and an upper cover 12 detachably mounted on the base 11. The upper cover 12 and the base 11 enclose the accommodation space 10. The sound outlet 14 is provided in the upper cover 12. The wall of the upper cover 12 away from the base 11 serves as a vibration surface. This facilitates assembly of the vibrator speaker, wherein the vibration surface fits in contact with the cochlea, thereby achieving sound wave transmission.

[0044] In the embodiment of the present utility model, the outer shell 1 includes a base 11 with an opening at the upper end and an upper cover 12 detachably mounted on the base 11. The upper cover 12 and the base 11 enclose the accommodating space 10. The sound outlet 14 is provided in the upper cover 12. The wall surface of the upper cover 12 away from the base 11 serves as a vibration surface.

[0045] This facilitates the assembly of the vibrator speaker, wherein the vibration surface fits the cochlea, thereby achieving the transmission of sound waves.

[0046] The sound outlet 14 is located in the middle of the upper cover 12 . The spring 3 , the sound outlet 14 , the magnetic circuit assembly 2 and the magnetic voice coil 4 are coaxially arranged and are all elliptical or circular.

[0047] It can ensure the transmission of sound waves and facilitate the assembly of headphones. It is applicable to products in both round and oval shapes.

[0048] Specifically, the lower wall of the upper cover 12 is provided with a downwardly extending surrounding portion 13 at the periphery of the sound outlet 14 , and the upper end of the conductive component 5 extends into the surrounding portion 13 and is of a size adapted thereto, thereby facilitating the installation and fixation of the first positioning seat 51 .

[0049] In this embodiment of the present invention, the conductive assembly 5 includes a first positioning seat 51 that engages with the spring 3, a second positioning seat 52 that engages with the lower wall of the upper cover 12, and a guide post 53 disposed between the first and second positioning seats 51, 52. The diameter of the guide post 53 is smaller than both the first and second positioning seats 51, 52. The provision of the guide post 53 ensures that the conductive assembly 5 has sufficient length to transmit the vibration generated by the spring 3, thereby ensuring that the vibration meets the desired requirements and improving the sound quality.

[0050] Specifically, the diameter of the second positioning seat 52 is larger than the diameter of the first positioning seat 51; thereby, the vibration transmission can be more stable. It can be understood that when the first positioning seat 51 vibrates, the second positioning seat 52 will inevitably vibrate. When the area of the first positioning seat 51 is smaller than that of the second positioning seat 52, the vibration amplitude transmitted to the second positioning seat 52 will be amplified, thereby making the bass and treble more consistent with the predetermined waveform.

[0051] In the embodiment of the present invention, the cross section of the conducting component 5 is in the shape of an I, which not only facilitates installation but also realizes the transmission of vibration.

[0052] In the embodiment of the present invention, the guide post 53 and the first positioning seat 51 are integrally provided.

[0053] In the embodiment of the present invention, the guide pillar 53 is a hollow structure.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the practical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A bone conduction earphone structure for preventing side sound leakage, characterized in that: include: An outer shell, wherein the outer shell is a cavity with an accommodating space inside, and a sound outlet hole is provided on the upper wall of the cavity; The magnetic circuit assembly is provided with a matching magnetic voice coil, which converts the electrical signal into a vibration frequency of a predetermined frequency. The magnetic circuit assembly includes a U cup, a magnet provided on the upper wall of the U cup, and a washer provided on the upper wall of the magnet. An extension portion extends upward from the outer circumference of the U cup, and the extension portion is provided with a non-magnetic positioning frame. The spring piece is made of non-magnetic material, the magnetic voice coil is arranged on the lower wall of the spring piece, the spring piece is arranged on the upper wall of the positioning frame, and the spring piece is made of non-magnetic material; The conductive component has a lower wall connected to the spring, an upper wall of the conductive component fits the top wall of the cavity, and is arranged opposite to the sound outlet.

2. The bone conduction earphone structure for preventing side sound leakage according to claim 1, characterized in that: A magnetic circuit gap is provided between the extension portion and the magnet, and the magnetic induction voice coil portion extends into the magnetic circuit gap.

3. The bone conduction earphone structure for preventing side sound leakage according to claim 1, characterized in that: The magnetic induction voice coil comprises an upper voice coil portion and a lower voice coil portion, and the thickness of the lower voice coil portion is greater than that of the upper voice coil portion.

4. The bone conduction earphone structure for preventing side sound leakage according to claim 1, characterized in that: The spring piece includes circular rings spaced apart along the same axis and a support arm connecting two adjacent circular rings. The lower end of the conductive component is connected to the innermost circular ring, and the magnetic voice coil is connected to the circular ring located in the middle. A distance is provided between the lower wall of the spring piece and the upper wall of the washer.

5. The bone conduction earphone structure for preventing side sound leakage according to claim 1, characterized in that: The bottom wall of the U cup is provided with a PCB board, the PCB board is provided with electronic components, and the PCB board is provided with a wire connected to the magnetic voice coil.

6. The bone conduction earphone structure for preventing side sound leakage according to claim 1, characterized in that: The outer shell includes a base with an opening at the upper end and an upper cover detachably mounted on the base. The upper cover and the base form the accommodating space. The sound outlet is provided in the upper cover. The wall of the upper cover away from the base is a vibration surface.

7. The bone conduction earphone structure for preventing side sound leakage according to claim 2, characterized in that: The outer shell includes a base with an opening at the upper end and an upper cover detachably mounted on the base. The upper cover and the base form the accommodating space. The sound outlet is provided in the upper cover. The wall of the upper cover away from the base is a vibration surface.

8. The bone conduction earphone structure for preventing side sound leakage according to claim 7, characterized in that: The lower wall of the upper cover is provided with a downwardly extending surrounding portion at the periphery of the sound outlet hole, and the upper end of the conductive component extends into the surrounding portion and is adapted to the size of the surrounding portion.

9. The bone conduction earphone structure for preventing side sound leakage according to claim 4, characterized in that: The conductive component includes a first positioning seat fitted with the spring, a second positioning seat fitted with the lower wall of the upper cover, and a guide column arranged between the first positioning seat and the second positioning seat, and the diameter of the guide column is smaller than the diameter of the first positioning seat and the diameter of the second positioning seat.

10. The bone conduction earphone structure for preventing side sound leakage according to claim 9, characterized in that: The diameter of the second positioning seat is greater than the diameter of the first positioning seat; The cross section of the conductive component is in the shape of an "I", the guide column and the first positioning seat are integrally arranged, and the guide column is a hollow structure.

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