Bone conduction hearing aid earphone

Abstract

The utility model belongs to hearing equipment technical field especially relates to a bone conduction hearing aid earphone, including elastic band and the elastic shell that is connected to the bottom of elastic band, the inside fixed mounting of elastic shell has the circuit board, the upper surface fixed mounting of circuit board has permanent magnet and voice coil, one side fixed mounting of circuit board has control switch and outer magnetic ring, the other side fixed mounting of circuit board has inner magnetic sheet. This bone conduction hearing aid earphone, through adopting bone conduction mode transmission sound, converts electric signal into vibration signal, through with human skin and bone contact, with solid as medium directly conduction sound wave to auditory nerve, avoided traditional air conduction earphone through ear drum conduction sound, large volume caused the heavy load impact of ear drum, can effectively reduce the damage of long -term use to ear drum, reduce the risk of hearing further decline, especially suitable for hearing impaired population, especially severe deafness patient uses.

Description

Technical Field

[0001] This utility model relates to the field of hearing aid technology, specifically a bone conduction hearing aid headphone. Background Technology

[0002] Traditional hearing aids are mostly air-conduction type headphones, which use electromagnetic force to drive the diaphragm to produce piston-like motion, coupling with air to generate sound. The sound is then conducted through the eardrum to the auditory nerve. For people with hearing impairments, especially those with severe hearing loss, high-volume stimulation of the auditory nerve is often required to achieve a hearing aid effect. However, this puts a heavy load on the eardrum, and long-term use can easily damage the eardrum, leading to further hearing loss.

[0003] Bone conduction headphones have emerged to address this need. They convert electrical signals into vibration signals and transmit sound waves directly to the auditory nerve through contact with the skin and bone, using a solid medium to protect the eardrum, thus attracting widespread attention. However, existing bone conduction headphones have several problems, such as complex manufacturing processes leading to high prices that deter many potential consumers; and significant room for improvement in sound quality, especially clarity. Summary of the Invention

[0004] The purpose of this invention is to provide a bone conduction hearing aid to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bone conduction hearing aid earphone, comprising an elastic strap and an elastic shell connected to the bottom of the elastic strap, wherein a circuit board is fixedly installed inside the elastic shell, a permanent magnet and a voice coil are fixedly installed on the upper surface of the circuit board, a control switch and an outer magnetic ring are fixedly installed on one side of the circuit board, and an inner magnetic sheet is fixedly installed on the other side of the circuit board.

[0006] Preferably, an earphone wire is fixedly connected to the outer surface of the elastic shell, and a conductive earphone is fixedly connected to the end of the earphone wire away from the elastic shell.

[0007] Preferably, the outer surface of the elastic shell is provided with a front end protrusion, and the conductive earphone conforms to the structure of the human ear canal.

[0008] Preferably, the permanent magnet, the voice coil, the outer magnetic ring, and the inner magnetic sheet form a magnetic circuit system for converting electrical signals into vibration signals.

[0009] Preferably, the elastic strap is made of elastic material and is used to fix the bone conduction hearing aid to the head.

[0010] Preferably, the headphone cable is used to transmit electrical signals. A permanent magnet, voice coil, outer magnetic ring, and inner magnetic sheet form a magnetic circuit system for converting electrical signals into vibration signals.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This bone conduction hearing aid uses bone conduction to transmit sound, converting electrical signals into vibration signals. Through contact with the skin and bone, sound waves are directly transmitted to the auditory nerve using a solid medium. This avoids the heavy impact on the eardrum caused by high volume when traditional air conduction headphones transmit sound through the eardrum. It can effectively reduce the damage to the eardrum with long-term use and reduce the risk of further hearing loss. It is especially suitable for people with hearing impairments, especially patients with severe hearing loss.

[0013] 2. This bone conduction hearing aid features an elastic strap made of elastic material that can adapt to different head sizes. Its elasticity secures the earphone to the head, ensuring stability and comfort. A front protrusion on the top of the elastic shell helps the earphone fit better against the corresponding part of the head, further improving stability. The shape of the conduction earphone conforms to the structure of the human ear canal, allowing it to be comfortably placed near the ear canal, ensuring effective transmission of vibration signals while enhancing wearing comfort. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the earphone according to this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the elastic shell of this utility model;

[0016] Figure 3 This is a schematic diagram of the back structure of the circuit board of this utility model.

[0017] In the diagram: 1. Elastic strap; 2. Elastic shell; 3. Earphone cable; 4. Conductive earphone; 201. Circuit board; 202. Permanent magnet; 203. Voice coil; 204. Control switch; 205. Outer magnetic ring; 206. Inner magnetic sheet. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-3This utility model provides a technical solution: a bone conduction hearing aid earphone, including an elastic strap 1 and an elastic shell 2 connected to the bottom of the elastic strap 1. An earphone wire 3 is fixedly connected to the outer surface of the elastic shell 2. A conductive earphone 4 is fixedly connected to the end of the earphone wire 3 away from the elastic shell 2. A front end protrusion is provided on the top of the outer surface of the elastic shell 2. The conductive earphone 4 conforms to the structure of the human ear canal. The earphone wire 3 is used to transmit electrical signals.

[0020] The elastic strap 1 is made of a flexible material, such as silicone or elastic plastic, to secure the bone conduction hearing aid to the head. Its shape is designed to fit different head sizes and uses its elasticity to secure the earphone to the head, ensuring stability and comfort when wearing it.

[0021] The elastic strap 1 is made of thermoplastic polyurethane (TPU) with a Shore hardness of 60A and an elongation at break of ≥400%. It maintains its elasticity in environments ranging from -20℃ to 60℃, making it suitable for users with different head circumferences. The two ends of the elastic strap 1 are connected to the elastic shell 2 through an injection molding process. The thickness of the coating layer is 1.5mm, and the peel strength is ≥30N / cm, ensuring that it will not fall off during long-term use.

[0022] The elastic shell 2 is connected to the bottom of the elastic strap 1, and its internal space is used to install the core electronic components. The elastic shell 2 is also made of elastic material, which can protect the internal components on the one hand, and can also adapt to slight pressure and shaking during wearing to a certain extent, thus enhancing the durability of the headphones.

[0023] The elastic shell 2 is manufactured using a two-stage injection molding process. The outer layer is made of elastic silicone with a hardness of 40A, and the inner layer is made of ABS engineering plastic. The shell wall thickness is 1.2mm, and the drop resistance is ≥1.5m. The front protrusion is located at the front 1 / 3 of the top of the elastic shell 2, with a height of 3mm and a width of 8mm. The surface curvature conforms to the contour of the human temporal bone, and the contact area is ≥25mm², improving vibration transmission efficiency.

[0024] The top of the outer surface of the elastic shell 2 has a front protrusion. This protrusion helps the headphones fit the corresponding part of the head better when worn, further improving wearing stability. The conductive earphone 4 is specially designed to perfectly conform to the structure of the human ear canal, allowing it to be comfortably placed near the ear canal. This ensures that vibration signals can be effectively transmitted to the auditory nerve through the bones, while reducing interference from external noise.

[0025] A circuit board 201 is fixedly installed inside the elastic shell 2. The circuit board 201 is the control and signal processing center of the entire headphone. A permanent magnet 202 and a voice coil 203 are fixedly installed on the upper surface of the circuit board 201. The permanent magnet 202 provides a constant magnetic field, and the voice coil 203 is located in this magnetic field. When an electrical signal passes through the voice coil 203, according to the principle of electromagnetic induction, the voice coil 203 will vibrate in the magnetic field. A control switch 204 and an outer magnetic ring 205 are fixedly installed on one side of the circuit board 201, and an inner magnetic sheet 206 is fixedly installed on the other side of the circuit board 201. The permanent magnet 202, voice coil 203, outer magnetic ring 205, and inner magnetic sheet 206 form a magnetic circuit system used to convert electrical signals into vibration signals. The control switch 204 is electrically connected to the circuit board 201 and is used to control the headphone's power on / off, volume adjustment, mode switching, and other operating states. The outer magnetic ring 205 guides and concentrates the magnetic field, forming a magnetic circuit system together with the permanent magnet 202 and the inner magnetic sheet 206. The inner magnetic sheet 206 further optimizes the magnetic circuit structure, enhances the stability and uniformity of the magnetic field, thereby improving the efficiency and accuracy of the voice coil 203's vibration.

[0026] The permanent magnet is made of neodymium iron boron (N42) material, with dimensions of Φ8mm×4mm, remanence density of 1.3T, coercivity of 1100kA / m, and is bonded to the circuit board 201 with a bonding area of ​​≥90% using high-temperature resistant epoxy resin with a temperature resistance of 120℃.

[0027] The voice coil is wound with 200 turns of 0.08mm enameled wire, and the frame is made of LCP liquid crystal polymer material with an inner diameter of 6mm, an outer diameter of 8mm, a DC resistance of 16Ω, and the air gap between it and the permanent magnet is controlled at 0.3±0.02mm to ensure a vibration frequency response range of 20-20000Hz.

[0028] The outer magnetic ring 205 is made of silicon steel sheets (35W250) stacked together, with an inner diameter of 10mm, an outer diameter of 15mm, a thickness of 2mm, a stacking coefficient of 0.95, a magnetic permeability of ≥8000, and is fixed by M1.2 screws with a screw spacing of 5mm and a torque of 0.1N・m.

[0029] The inner magnetic sheet 206 is made of permalloy (1J79), with a thickness of 0.1 mm and a diameter of 8 mm. The surface is electroplated with a nickel layer with a thickness of 5 μm. The distance between the inner magnetic sheet and the bottom surface of the permanent magnet is 0.1 mm, forming a closed magnetic circuit with a magnetic resistance of ≤1000 A / Wb.

[0030] The headphone cable 3 uses a 4-core shielded cable (2 cores for audio and 2 cores for power), with 7 strands of 0.1mm oxygen-free copper conductors, an aluminum foil shielding layer, and a braided mesh shielding layer. The outer sheath is made of TPE material with a hardness of 70A and a bending life of ≥10,000 cycles.

[0031] The connection between the headphone cable 3 and the elastic shell 2 uses a waterproof Micro-USB interface with IPX5 protection and a plug-in / plug-out life of ≥5000 times.

[0032] The control switch 204 is a waterproof tactile switch (IP67) with a button travel of 0.3mm, an operating force of 1.5N, and a silicone cap (0.5mm thick) covering the surface. It supports single-click (power on / off), double-click (volume up), and triple-click (volume down) functions, with a response time of ≤50ms.

[0033] The conductive earphone 4 is designed to fit the ear canal, with a titanium alloy frame that is 0.8mm thick. The outer layer is covered with medical-grade silicone with a hardness of 25A. The contact end is ellipsoidal with a surface roughness Ra≤0.8μm. The pressure when in contact with the ear canal cartilage is ≤2kPa, ensuring wearing comfort.

[0034] The vibration transmission efficiency is ≥50μm at a frequency of 1000Hz, the sound pressure level after transmission through the skull is ≥75dB, and the distortion rate is ≤3%.

[0035] The circuit board 201 is fixed to the inner wall of the housing by four M1.4 screws with a screw hole spacing of 25mm×20mm and a torque of 0.08N・m. It is surrounded by thermally conductive silicone with a thermal conductivity of 1.5W / m・K to reduce the temperature rise of the components.

[0036] The connection between the headphone cable 3 and the shell is sealed using an injection molding process with a 2mm thick adhesive layer to ensure waterproof sealing. It was tested in 1m water for 30 minutes without any leakage.

[0037] Working principle: When the headphones are powered on and the control switch 204 is turned on, the audio electrical signal is transmitted to the circuit board 201 through the headphone cable 3. The circuit board 201 processes the signal and sends it to the voice coil 203. In the magnetic circuit system formed by the permanent magnet 202, the outer magnetic ring 205, and the inner magnetic sheet 206, the voice coil 203 vibrates according to the change of the electrical signal. This vibration is transmitted to the conductive headphones 4 through the elastic shell 2. The conductive headphones 4 come into contact with the human skin and bones, directly transmitting the vibration signal to the auditory nerve through a solid medium, thereby realizing the transmission of sound and achieving the effect of assisting hearing.

[0038] The induced current generated by the voice coil 203 drives it to vibrate in a magnetic field with an amplitude of 40μm and a vibration frequency consistent with the electrical signal; the magnetic flux change rate of the magnetic circuit system is ≥0.5Wb / s, and the electro-vibration conversion efficiency is ≥35%; the vibration acceleration transmitted to the skull by the conductive earphone 4 is ≥10m / s², and the equivalent sound pressure level perceived by the auditory nerve is 70dB, which meets the hearing aid needs of people with mild to severe hearing impairment.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A bone conduction hearing aid earphone, comprising an elastic band (1) and an elastic shell (2) connected to the bottom of the elastic band (1), characterized in that: A circuit board (201) is fixedly installed inside the elastic shell (2). A permanent magnet (202) and a voice coil (203) are fixedly installed on the upper surface of the circuit board (201). A control switch (204) and an outer magnetic ring (205) are fixedly installed on one side of the circuit board (201). An inner magnetic sheet (206) is fixedly installed on the other side of the circuit board (201).

2. The bone conduction hearing aid earphone according to claim 1, characterized in that: The outer surface of the elastic shell (2) is fixedly connected to an earphone wire (3), and the end of the earphone wire (3) away from the elastic shell (2) is fixedly connected to a conductive earphone (4).

3. The bone conduction hearing aid earphone according to claim 2, characterized in that: The outer surface of the elastic shell (2) is provided with a front end protrusion, and the conductive earphone (4) conforms to the structure of the human ear canal.

4. The bone conduction hearing aid earphone according to claim 1, characterized in that: The permanent magnet (202), the voice coil (203), the outer magnetic ring (205), and the inner magnetic sheet (206) form a magnetic circuit system for converting electrical signals into vibration signals.

5. The bone conduction hearing aid earphone according to claim 1, characterized in that: The elastic strap (1) is made of elastic material and is used to fix the bone conduction hearing aid to the head.

6. The bone conduction hearing aid earphone according to claim 2, characterized in that: The headphone cable (3) is used to transmit electrical signals.

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