Bluetooth earphone and earphone assembly

Abstract

The invention discloses a Bluetooth earphone and an earphone assembly, and relates to the technical field of earphones, the Bluetooth earphone comprises at least one clamping head, the clamping head comprises a rigid shell, a flexible shell, a sensing part and an adjusting part, the flexible shell and the rigid shell jointly define a containing cavity, the containing cavity is configured to contain a sound production device or a power supply device, and the sound production device or the power supply device is arranged in the containing cavity. A clamping area which abuts against the cavity wall of the auricular conchae or the back side of the auricle of a user during wearing is formed on the flexible shell; the sensing part is contained in the containing cavity, and the sensing part is configured to collect pressure distribution information of the clamping area and output a control signal according to the pressure distribution information; the adjusting part is located in the containing cavity and is in communication connection with the sensing part, and the adjusting part is configured to receive the control signal and drive the flexible shell to be in the shape attached to the cavity wall of the auricular conchae or the auricle back side of the user according to the control signal. The objective of the invention is to solve the problem that an existing ear clip type Bluetooth earphone is difficult to dynamically adjust pressure according to the contour of an ear, so that the fitting degree is poor.

Description

Technical Field

[0001] This invention relates to the field of headphone technology, and in particular to a Bluetooth headphone and headphone assembly. Background Technology

[0002] Clip-on Bluetooth earphones are a new type of portable audio device that is worn by clipping onto the user's ear canal or concha. This design not only frees up the user's hands but is also widely popular due to its stylish appearance and convenient use.

[0003] Existing ear clip Bluetooth headphones typically employ an adjustable clamping structure, which adapts to different users' ear shapes by adjusting the clamping angle of the memory metal arm or using an adjustable clamping arm. These structures are designed to provide a certain range of adjustment to meet the wearing needs of different users.

[0004] However, in actual use, because the shape and size of the ears vary from person to person, the existing clamping parts are difficult to dynamically adjust according to the natural contour of the ear, resulting in a less than ideal fit when worn. In addition, when worn for a long time, the rigid clamping parts will exert continuous pressure on the ear, causing discomfort to the user and possibly even causing damage to the ear, thus affecting the user experience. Summary of the Invention

[0005] The main objective of this invention is to provide a Bluetooth headset and headset assembly that aims to solve the problem of poor fit caused by the difficulty of dynamically adjusting pressure according to the contour of the ear in existing clip-on Bluetooth headsets.

[0006] To achieve the above objectives, the present invention provides a Bluetooth headset, comprising at least one clamping head, the clamping head comprising: Rigid shell; A flexible shell, together with the rigid shell, forms a receiving cavity, the receiving cavity being configured to accommodate a sound-generating device or a power supply device, and the flexible shell having a clamping area that abuts against the cavity wall of the user's concha or the back of the auricle when worn; A sensing unit, housed within the receiving cavity, configured to acquire pressure distribution information of the clamping area and output a control signal based on the pressure distribution information; and An adjustment unit is located in the accommodating cavity and is communicatively connected to the sensing unit. The adjustment unit is configured to receive the control signal and drive the flexible shell to deform into a shape that fits against the cavity wall of the user's concha or the back of the auricle according to the control signal.

[0007] In one embodiment, the adjustment unit includes: The support unit is fixedly connected to the rigid shell; A drive unit, disposed on the support unit and communicatively connected to the sensing unit, is configured to receive the control signal and output a driving force; and A deformation unit, which is connected to the drive unit, is configured to change shape under the action of the drive force to drive the flexible shell to deform toward the cavity wall of the user's concha or the back of the auricle.

[0008] In one embodiment, the deformation unit includes a plurality of independently disposed airbags; the airbags are configured to abut against the clamping region of the flexible shell; The driving unit includes a plurality of piezoelectric driving structures, each corresponding to one of the multiple airbags. Each piezoelectric driving structure includes a piezoelectric actuator, a transmission component, and a control module. The piezoelectric actuator is fixed to the support unit and communicatively connected to the sensing unit. The transmission component drives the piezoelectric actuator and the airbag. The control module is electrically connected to the piezoelectric actuator and is configured to adjust the voltage applied to the piezoelectric actuator according to the control signal to control the deformation of the piezoelectric actuator, thereby realizing the inflation or deflation of the airbag.

[0009] In one embodiment, the piezoelectric actuator includes a plurality of piezoelectric elements stacked in the deformation direction, and the control module is configured to adjust the voltage applied to the different piezoelectric elements.

[0010] In one embodiment, the support unit includes: A partition, wherein the partition and the rigid shell enclose a mounting cavity, and the partition, the rigid shell, and the flexible shell enclose a deformation cavity; and Multiple elastic support ribs are evenly distributed circumferentially. The cross-section of each elastic support rib is arc-shaped. One end of each elastic support rib is fixedly connected to the side of the partition plate near the flexible shell, and the other end is fixedly attached to the inner surface of the flexible shell.

[0011] In one embodiment, the sensing unit includes: A flexible circuit board, wherein the flexible circuit board is attached to the inner wall of the flexible housing; A pressure sensing unit is disposed on the side of the flexible circuit board facing the flexible housing. The pressure sensing unit includes multiple pressure sensors arranged in an array. The sensing ends of the pressure sensors abut against the inner wall of the flexible housing and are configured to detect local pressure in the clamping area. A signal processing unit is disposed on the side of the flexible circuit board away from the flexible housing and is electrically connected to the pressure sensing unit. The signal processing unit is configured to summarize the local pressures of the clamping area to generate the pressure distribution information and output the control signal.

[0012] In one embodiment, the pressure sensor includes a micro-resistor and an elastic protrusion electrically connected to the micro-resistor; the micro-resistor is disposed on the side of the flexible circuit board facing the flexible housing; the elastic protrusion protrudes at least partially from the flexible circuit board and abuts against the inner wall of the flexible housing, and the elastic protrusion is configured to transmit local pressure to the micro-resistor. The signal processing unit includes an analog multiplexer and a microcontroller. The analog multiplexer is configured to sequentially scan the resistance changes of each of the micro-force-sensitive resistors and output the scan results. The microcontroller is configured to generate the control signal based on the scan results.

[0013] In one embodiment, the Bluetooth headset includes two clamping heads, namely a first clamping head and a second clamping head, wherein the flexible shell of the first clamping head is configured to abut against the cavity wall of the user's concha, and the flexible shell of the second clamping head is configured to abut against the back side of the user's auricle. The Bluetooth headset further includes an elastic connector, a sound-generating device, and a power supply device. The elastic connector is connected to the rigid housing of the first clamping head and the rigid housing of the second clamping head, respectively, and a wiring channel is formed inside the elastic connector. The sound-generating device is disposed in the receiving cavity of the first clamping head. The power supply device is disposed in the receiving cavity of the second clamping head, and the power supply line of the power supply device passes through the wiring channel and is electrically connected to the sound-generating device.

[0014] In one embodiment, the outer surface of the clamping area of ​​the flexible shell is provided with a plurality of anti-slip particles, which are distributed in a dot matrix pattern, and the height of the anti-slip particles is A, 0.1mm≤A≤0.5mm; or The outer surface of the clamping area of ​​the flexible shell is provided with multiple anti-slip strips, which are distributed in a continuous stripe or grid pattern. The depth of the anti-slip strip is B, where 0.2mm≤B≤0.8mm.

[0015] The present invention also provides an earphone assembly, comprising: Bluetooth headsets as mentioned above; and The charging case has a receiving slot adapted to the shape of the Bluetooth headset, and the inner wall of the receiving slot is provided with elastic charging contacts corresponding to the charging interface of the Bluetooth headset.

[0016] The ear-clip Bluetooth earphone provided by this invention solves the problem of poor fit caused by the inability of existing ear-clip Bluetooth earphones to dynamically adjust according to the natural contour of the ear by adopting a collaborative structure of flexible shell, sensing unit, and adjustment unit. Specifically, when the user wears the earphone, the clamping area of ​​the flexible shell abuts against the cavity wall of the concha or the back of the auricle. The sensing unit, housed in the cavity formed by the rigid shell and the flexible shell, collects the pressure distribution information of the clamping area and outputs a control signal based on the pressure distribution information. The adjustment unit, which is communicatively connected to the sensing unit and is also located in the cavity, receives the control signal and drives the flexible shell to deform, so that the clamping area of ​​the flexible shell is adjusted to fit the natural contour of the cavity wall of the user's concha or the back of the auricle, thus completing the dynamic adaptation. In this way, the flexible shell and adjustment unit replace the traditional rigid clamping structure. The flexibility of the shell itself, combined with the targeted deformation driven by the adjustment unit, can avoid the continuous pressure of rigid components on the ear. The real-time acquisition of pressure distribution by the sensing unit ensures the accuracy of adjustment, allowing the device to adapt to the ear shape of different users, significantly improving the fit and thus enhancing the comfort of wearing for a long time, avoiding damage to the ear, and optimizing the user's wearing experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the Bluetooth headset provided by the present invention; Figure 2 for Figure 1 A partial sectional view at point A in the middle.

[0019] Figure label: 100. Bluetooth headset; 1. Clamping head; 11. Rigid shell; 12. Flexible shell; 13. Adjustment part; 131. Support unit; 1311. Partition; 1312. Elastic support rib; 132. Drive unit; 1321. Piezoelectric sheet; 1322. Transmission component; 133. Deformation unit; 1331. Airbag; 2. Elastic connection part.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0023] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0024] This invention proposes an ear clip-on Bluetooth headset 100.

[0025] Please see Figure 1 and Figure 2 In one embodiment, the Bluetooth headset 100 proposed by the present invention includes at least one clamping head 1, the clamping head 1 comprising: Rigid shell 11; The flexible shell 12 and the rigid shell 11 together form a receiving cavity, which is configured to accommodate a sound-generating device or a power supply device. The flexible shell 12 has a clamping area that abuts against the cavity wall of the user's concha or the back of the auricle when worn. A sensing unit, housed within a receiving cavity, is configured to acquire pressure distribution information of the clamping area and output a control signal based on the pressure distribution information; and The adjustment unit 13 is located in the accommodating cavity and is communicatively connected to the sensing unit. The adjustment unit 13 is configured to receive control signals and drive the flexible shell 12 to deform into a shape that fits against the cavity wall of the user's concha or the back of the auricle according to the control signals.

[0026] The ear-clip Bluetooth earphone 100 provided by this invention, through the collaborative structure of a flexible shell 12, a sensing unit, and an adjustment unit 13, can solve the problem of poor fit caused by the difficulty of dynamically adjusting to the natural contour of the ear in existing ear-clip Bluetooth earphones 100. Specifically, when the user wears the earphone, the clamping area of ​​the flexible shell 12 abuts against the cavity wall of the concha or the back of the auricle. The sensing unit, housed within the cavity formed by the rigid shell 11 and the flexible shell 12, collects the pressure distribution information of the clamping area and outputs a control signal based on the pressure distribution information. The adjustment unit 13, which is communicatively connected to the sensing unit and is also located in the cavity, receives the control signal and drives the flexible shell 12 to deform, adjusting the clamping area of ​​the flexible shell 12 to fit the natural contour of the cavity wall of the user's concha or the back of the auricle, thus completing the dynamic adaptation. In this way, the flexible shell 12 and the adjustment part 13 replace the traditional rigid clamping structure. The flexible characteristics of the flexible shell 12 itself, combined with the targeted deformation driven by the adjustment part 13, can avoid the continuous pressure of rigid components on the ear. The real-time acquisition of pressure distribution by the sensing part ensures the accuracy of adjustment, so that the device can adapt to the ear shape of different users, significantly improve the fit, thereby improving the comfort of wearing for a long time, avoiding damage to the ear, and optimizing the user wearing experience.

[0027] It should be noted that the clamping head 1 is an independent functional unit that directly contacts the user's ear and achieves clamping and fixation. Its overall shape can be arc-shaped, L-shaped, or irregular to adapt to the physiological structure of the ear. It is supported by a rigid shell 11, while a flexible shell 12 achieves flexible contact with the ear. Internally, it integrates sensing, adjustment, and core electronic components (sound-generating device, power supply, etc.), serving as both the execution component for wearing and fixing the ear and the carrier for realizing its functions. The aforementioned phrase "including at least one clamping head 1" means that the technical solution of this invention has flexible adaptability in practical applications. It can be applied to a single-ear Bluetooth headset 100, i.e., containing only one clamping head 1, and this clamping head 1 adopts the structure designed in this invention, or it can be applied to a dual-ear Bluetooth headset 100. For the dual-ear Bluetooth earphone 100, there are two implementation scenarios: one is that both clamping heads 1 adopt the structure designed in this invention, that is, both include a rigid shell 11, a flexible shell 12, a sensing part, and an adjustment part 13, so as to achieve dynamic adaptation and comfortable wearing of the user's concha wall and the back of the auricle; the other is that only one clamping head 1 adopts the structure designed in this invention, and the other clamping head 1 adopts the conventional earphone head in the prior art, so as to achieve dynamic adaptation and comfortable wearing of the user's concha wall or the back of the auricle. This design method allows the technical solution of this invention to be compatible with some structures of existing earphones, reducing the cost and difficulty of technical upgrades, while also providing users with more diversified choices. They can experience the optimized wearing feeling of dual-sided dynamic adaptation, or choose a single-sided optimization solution according to their needs.

[0028] The rigid shell 11 serves as the support structure for the clamping head 1. Its design principle dictates that it does not directly contact the user's ear skin or tissue, but rather forms an integral structure through a fixed connection with the flexible shell 12. Specifically, the outer side (the side facing away from the ear) of the rigid shell 11 can be exposed to the external environment or serve as part of the earphone's appearance, while the inner side is enclosed with the flexible shell 12 to form a receiving cavity. Its edges or surfaces do not extend into the area contacting the concha wall, the back of the auricle, or other ear regions. This avoids the pressure or friction damage caused by direct contact between rigid materials and the ear, further differentiating it from traditional ear clips where rigid components directly clamp the ear, with the contact pressure entirely borne by the flexible shell 12. This ensures that the support function of the rigid shell 11 is separated from the contact adjustment function of the flexible shell 12. The rigid shell 11 only provides structural stability and does not participate in pressure transmission during wear, thus ensuring that when the adjustment part 13 drives the flexible shell 12 to deform, the rigid shell 11 will not generate additional force interference on the ear, improving the accuracy of dynamic fitting.

[0029] It is important to note that although the core design of this invention is to prevent the rigid shell 11 from directly contacting the ear (mainly through the flexible shell 12 for fit and pressure transmission), significant individual differences exist in the shape and size of users' ears (e.g., some users have unique ear contours or narrow concha spaces). Therefore, during actual wear, the edges or localized areas of the rigid shell 11 may make slight contact with the ear (e.g., the outer edge of the auricle, the area near the tragus, and other non-sensitive areas). Thus, the edges of the rigid shell 11 can be rounded to avoid sharp corners, and the area that may contact the ear can be thinned (thinner than the main body) to reduce pressure during contact. Alternatively, the flexible shell 12 can have an extended flexible skirt near the edge of the rigid shell 11. Even if the rigid shell 11 makes slight contact with the ear, this skirt can act as a buffer, preventing direct friction between the rigid material and the skin.

[0030] The flexible shell 12 serves as the "contact adjustment layer" for the clamping head 1. It is made of highly elastic, biocompatible, and aging-resistant materials, such as medical-grade silicone, thermoplastic elastomer (TPE), and polyurethane elastomer. Its thickness is typically 0.3-2 mm (balancing flexibility and structural strength). The connection between the flexible shell 12 and the rigid shell 11 can be achieved through injection molding, food-grade adhesive bonding, or snap-fit ​​sealing (ensuring the cavity's airtightness). The flexible shell 12 and the rigid shell 11 are connected by an edge seal, forming a hollow "receiving cavity." The size of this cavity is designed according to the components to be accommodated (e.g., a sound wave conduction channel needs to be reserved for the sound-generating device, and a heat dissipation gap needs to be reserved for the power supply device). It is usually divided into multiple zones, such as a circuit zone, a sensing zone, and an adjustment zone, to avoid interference between components. Since the clamping area is a specific area on the flexible shell 12 that is specially designed to directly contact the user's ear, its spatial range needs to match the cavity wall of the concha or the physiological structure of the back of the auricle. For example, if it is adapted to the cavity wall of the concha, the clamping area is usually irregularly arc-shaped. The clamping area needs to cover the inner side of the cymba concha, the bottom of the concha, and the concave area between the tragus and the antitragus, with an area of ​​about 1-3 cm² (designed according to the average size of an adult ear), and its edge roughly matches the contour line of the concha. Alternatively, if it is adapted to the back of the auricle, the clamping area is designed to fit the curved surface of the antihelix, scaphoid fossa, and the inner side of the outer edge of the auricle, with a shape slightly "C"-shaped, which can wrap around the protrusions and depressions on the back of the auricle to ensure stability during clamping. In addition, the thickness of the clamping area can be designed to be uniform or not. When the thickness of the clamping area is not uniform, a gradient change can be designed according to the force requirements. For example, the thickness of the edge area that needs to bear the main clamping force (such as the part that contacts the outer edge of the auricle) is slightly larger (1.5-2mm) to ensure structural strength, while the thickness of the central area that contacts the sensitive part of the concha (such as the inner side of the cymba concha) is thinner (0.5-1mm) to improve deformation sensitivity and softness.

[0031] Thus, when the clamping head 1 is working, the rigid shell 11 provides stable support, and the clamping area of ​​the flexible shell 12 serves as the contact interface with the ear; the sensing unit monitors the contact status in real time through a pressure sensor array to accurately locate fitting defects; the adjustment unit 13 drives the flexible shell 12 to deform in a targeted manner according to the sensing signal to dynamically eliminate defects; the accommodating cavity provides integrated space for the sound-generating device (such as a miniature dynamic speaker, which requires a sound outlet to be opened on the flexible shell 12 or the rigid shell 11), the power supply device (such as a small lithium battery), and the above-mentioned components, ensuring that each function is realized in synergy.

[0032] The adjustment unit 13 is the actuator in the clamping head 1 that enables the dynamic deformation of the flexible shell 12. Its core function is to receive the control signal output by the sensing unit (including the location of the pressure abnormality area, the pressure value, and the adjustment range information), and apply a targeted force to the clamping area of ​​the flexible shell 12 through mechanical, fluid, or smart material actuation, causing it to deform locally or as a whole, ultimately achieving a fit with the contour of the user's ear. Therefore, the adjustment unit 13 must be designed to be compact, responsive, have controllable driving force, and low energy consumption. To meet the above requirements, in one embodiment, the adjustment unit 13 includes a support unit 131, a drive unit 132, and a deformation unit 133. The support unit 131 is fixedly connected to the rigid housing 11. The drive unit 132 is disposed on the support unit 131 and is communicatively connected to the sensing unit. The drive unit 132 is configured to receive control signals and output driving force. The deformation unit 133 is drively connected to the drive unit 132 and is configured to undergo shape changes under the action of the driving force to drive the flexible housing 12 to deform towards or away from the cavity wall of the user's concha or the back of the auricle.

[0033] In this embodiment, when the sensing unit detects an abnormal pressure in the clamping area and outputs a control signal, the drive unit 132 receives the signal and outputs a corresponding driving force based on the position, pressure value, and adjustment range information in the signal. The deformation unit 133 undergoes a shape change (such as stretching, bending, or expanding) under the driving force. Since the deformation unit 133 is connected to the inside of the clamping area of ​​the flexible shell 12, its shape change directly causes the corresponding position of the flexible shell 12 to deform towards or away from the ear. That is, when it is necessary to fill the gap, the deformation unit 133 extends towards the ear, pushing the flexible shell 12 to bulge and fit the ear; when it is necessary to relieve pressure, the deformation unit 133 contracts away from the ear, pulling the flexible shell 12 back to reduce the contact pressure. During this process, the support unit 131 ensures the stability of the positions of the drive unit 132 and the deformation unit 133, ensuring precise execution of the adjustment action until the sensing unit detects a uniform pressure distribution, completing the dynamic adaptation.

[0034] Specifically, the adjustment unit 13 can adopt an integrated piezoelectric drive structure. For example, the adjustment unit 13 may include a flexible circuit board, multiple piezoelectric sheets 1321 and a control chip. The flexible circuit board is fixed to the rigid housing 11 and is communicatively connected to the sensing unit. The piezoelectric sheets 1321 are arranged in an array on the side of the flexible circuit board facing the flexible housing 12, and each unit corresponds to a subdivided position of the clamping area. The control chip is integrated on the flexible circuit board. In this embodiment, the support unit 131 is a flexible circuit board, which is fixed to the rigid shell 11 by a high-temperature resistant adhesive layer. It not only serves as a mounting carrier for the piezoelectric sheet 1321 and the control chip, but also adapts to the curved contour of the accommodating cavity through its own flexible properties, ensuring the stability of the position of each component. The drive unit 132 and the deformation unit 133 are composed of the control chip and the piezoelectric sheet 1321. After receiving the pressure distribution signal from the sensing part, the control chip analyzes the coordinates and deformation parameters of the area to be adjusted and outputs a voltage signal to the corresponding piezoelectric sheet 1321. Under the action of the electric field, the piezoelectric sheet 1321 stretches or contracts to generate driving force. Since the piezoelectric sheet 1321 is bonded to the inside of the clamping area of ​​the flexible shell 12 by flexible adhesive, when it deforms, it directly drives the flexible shell 12 to bulge towards the ear or to be recessed towards the accommodating cavity.

[0035] In another embodiment, the adjustment unit 13 can adopt a magnetically controlled deformation structure, including permanent magnet microspheres fixed to the electromagnetic coil array and embedded in the flexible housing 12, as well as a magnetic field control module. The electromagnetic coil array is communicatively connected to the induction unit, with each coil corresponding to a specific position in the clamping area, and the permanent magnet microspheres corresponding one-to-one with the coils. In this embodiment, the support unit 131 is a rigid plastic base with positioning grooves, which is fixed to the rigid housing 11 by snap-fit. The surface of the base has electromagnetic coil mounting holes distributed in a grid pattern to ensure precise alignment between the coil array and the subdivided positions of the clamping area. The drive unit 132 includes a magnetic field control module and an electromagnetic coil array. After receiving the signal from the induction unit, the magnetic field control module calculates the current parameters of the target coil (e.g., the forward piezoelectric element 1321 generates an attractive force of 100mA, and the reverse piezoelectric element 1321 generates a repulsive force of 80mA), and... Power is supplied to the coil via a flexible wire. When the coil is energized, it generates a gradient magnetic field, forming a driving force. The deformation unit 133 consists of a permanent magnet microsphere with a piezoelectric element 1321 (1 mm in diameter), embedded in the inner elastic layer of the clamping area of ​​the flexible shell 12, corresponding one-to-one with the coil. When subjected to the magnetic field force, the microsphere drives the surrounding flexible material to move in the direction of the magnetic field, causing deformation of the piezoelectric element 1321 (0.5-2 mm in diameter) at the corresponding position in the clamping area. The elastic connection between the microsphere and the flexible material buffers the sudden change in magnetic field force, preventing ear discomfort. In this embodiment, non-contact magnetic force is used for driving, reducing frictional losses between components, extending the service life of the adjustment unit 13, and allowing for precise control of the magnetic field strength. This enables fine deformation adjustment of the flexible shell 12, adapting to the complex curves of the ear contour.

[0036] In one embodiment, the deformation unit 133 includes a plurality of independently disposed airbags 1331; the airbags 1331 are configured to abut against the clamping area of ​​the flexible shell 12; The drive unit 132 includes multiple piezoelectric drive structures, each corresponding to a multiple airbag 1331. Each piezoelectric drive structure includes a piezoelectric actuator, a transmission component 1322, and a control module. The piezoelectric actuator is fixed to the support unit 131 and is communicatively connected to the sensing unit. The transmission component 1322 drives the piezoelectric actuator and the airbag 1331. The control module is electrically connected to the piezoelectric actuator and is configured to adjust the voltage applied to the piezoelectric actuator according to the control signal to control the deformation of the piezoelectric actuator, thereby realizing the inflation or deflation of the airbag 1331.

[0037] In this embodiment, the deformation unit 133 includes 3-8 independently configured airbags 1331, the number of which can be adjusted according to the area of ​​the clamping region. Each airbag 1331 corresponds to a subdivided block (such as a 5mm × 5mm square area) of the clamping region of the flexible shell 12, ensuring targeted adjustment for different positions of the ear. The airbag 1331 is made of medical-grade silicone film or polyurethane elastomer with a thickness of 0.1-0.2mm through heat-sealing, and is flat. For example, its thickness is 1-2mm in its natural state, and its maximum thickness can reach 5mm after inflation. The interior of the airbag 1331 is a closed cavity, connected to the transmission component 1322 only through a micro-interface. The outer surface of the airbag 1331 (the side in contact with the inner side of the flexible shell 12) is fixed to the inner side of the clamping region of the flexible shell 12 with adhesive to ensure that the deformation of the airbag 1331 can directly drive the flexible shell 12 to deform synchronously. When necessary, each airbag 1331 is separated by a silicone spacer to prevent mutual interference when adjacent airbags 1331 are inflated / deflated, ensuring that the deformation of each airbag 1331 only affects the flexible shell 12 of its corresponding area.

[0038] The drive unit 132 contains the same number of piezoelectric drive structures as the airbags 1331 (i.e., 3-8), with each piezoelectric drive structure independently controlling one airbag 1331. The piezoelectric drive structure includes a piezoelectric actuator, a transmission component 1322, and a control module. The piezoelectric actuator uses a PZT piezoelectric ceramic sheet as the core drive element, which is fixed to the corresponding mounting slot of the support unit 131 by conductive adhesive or a snap-fit ​​structure to ensure alignment with the airbag 1331. During installation, the piezoelectric actuator is electrically connected to the sensing unit and the control module via a flexible wire or a communication module such as Bluetooth. It can receive the pressure distribution signal from the sensing unit and generate axial expansion and contraction deformation under the voltage drive of the control module.

[0039] The transmission component 1322 can be a rod or a piston. When the transmission component 1322 is a rod, one end is rigidly connected to the output end of the piezoelectric actuator (by welding or thermal fusion), and the other end is bonded to the air bladder 1331. When the piezoelectric actuator extends or retracts, the transmission rod compresses the air bladder 1331, thereby changing the volume of the air bladder 1331 to compress the flexible shell 12. When the transmission component 1322 is a piston, the piston can include a miniature piston and a cylinder. The cylinder is a short, hollow metal tube with a small diameter, made of lightweight and corrosion-resistant materials such as PEEK, PTFE, and PBT. It is fixed to the support unit 131 and sealed to the miniature interface on the air bladder 1331. The piston is a ceramic rod, one end of which is rigidly connected to the output end of the piezoelectric actuator (by laser welding), and the other end extends into the cylinder to form a sealed fit. When the piezoelectric actuator extends or retracts, the piston reciprocates within the cylinder. By changing the volume of the space connecting the cylinder and the air bladder 1331, the air bladder 1331 is inflated. That is, when the piston retracts, the volume increases, drawing air into the air bladder 1331, or when the piston extends, the volume decreases, compressing air out of the air bladder 1331.

[0040] The control module can use an integrated MCU chip (such as the STM32L0 series), which is electrically connected to each piezoelectric actuator via a flexible circuit board and communicates with the sensing unit via wires. The control module has a built-in pressure-voltage mapping algorithm, which can convert the pressure signal output by the sensing unit, such as a pressure value of 2.5N in a certain area exceeding the comfort threshold of 1.5N, into a voltage adjustment command for the corresponding piezoelectric actuator. For example, outputting a 60V voltage controls it to generate an elongation of 0.18mm, driving the movement of the transmission component 1322, and monitors the deformation of the piezoelectric actuator in real time (achieved through a built-in feedback resistor) to ensure adjustment accuracy.

[0041] When the user wears it, the clamping area of ​​the flexible shell 12 abuts against the cavity wall of the concha or the back of the auricle. The sensing unit collects the pressure distribution information of the clamping area and outputs a control signal. After receiving the signal, the control module adjusts the applied voltage of the corresponding piezoelectric actuator according to the location of the abnormal pressure area (too high or too low), controls the piezoelectric actuator to generate a specific deformation, and the transmission component 1322 transmits the deformation of the piezoelectric actuator to the corresponding airbag 1331, so as to realize the inflation of the airbag 1331 (pushing the flexible shell 12 to bulge towards the ear to fill the gap) or deflation (causing the flexible shell 12 to retract to relieve pressure), and finally make the clamping area fit the contour of the ear. In this way, by having multiple independent airbags 1331 abut against the clamping area, precise and localized deformation adjustment can be achieved for different positions on the ear, avoiding fit deviation caused by overall adjustment; the piezoelectric drive structure responds quickly and the deformation is controllable. With the control module's precise voltage adjustment, the deformation of the airbags 1331 can be controlled to ensure uniform pressure distribution; the piezoelectric actuator is fixed to the support unit 131, ensuring drive stability while avoiding direct contact between rigid components and the ear. Combined with the flexible support of the airbags 1331, local pressure is significantly reduced, improving comfort during long-term wear and effectively preventing ear damage.

[0042] In one embodiment, the piezoelectric actuator includes a plurality of piezoelectric sheets 1321 stacked in the deformation direction, and the control module is configured to adjust the voltage applied to the different piezoelectric sheets 1321.

[0043] It should be noted that the piezoelectric actuator may include 2-4 piezoelectric elements 1321. These elements maintain the same size and polarization direction and are stacked in the deformation direction (i.e., the axial expansion / contraction direction) to form a "sandwich" stacked structure, ensuring that each element 1321 undergoes expansion / contraction along its thickness under voltage. Adjacent elements 1321 are bonded together with conductive adhesive, achieving both mechanical connection and electrical conductivity between the electrodes. A thick, insulating, and high-temperature resistant film, such as a PI film, can be wrapped around the outer surface of the outermost element 1321 to prevent short circuits with the support unit 131 or other components. Each element 1321 has its upper and lower electrodes individually led out. The lower electrode of the bottom element 1321 and the upper electrode of the top element 1321 serve as a common electrode (connected to power ground). The electrodes of the remaining elements 1321 are connected to the independent output terminals of the control module for individual voltage control. The control module can calculate the target voltage of each piezoelectric element 1321 based on the pressure signal output by the sensing unit. For example, if a certain area needs to be inflated by 0.2mm by the airbag 1331 to increase the pressure of the flexible shell 12 on the ear, the control module can calculate the target voltage of each piezoelectric element 1321 through the built-in algorithm. If a small deformation (such as 0.05mm) is required, only one piezoelectric element 1321 can be driven; if a medium deformation (such as 0.15mm) is required, two piezoelectric elements 1321 can be driven (such as a deformation of 0.08mm + 0.07mm = 0.15mm, to avoid a slight synergistic effect after stacking); if the maximum deformation (such as 0.22mm) is required, all three piezoelectric elements 1321 can be driven.

[0044] Thus, since multiple piezoelectric elements 1321 can be adjusted independently, even if a certain piezoelectric element 1321 experiences deformation drift due to temperature changes (such as a temperature increase of 5-10℃ caused by heat dissipation from the ear), the control module can compensate by adjusting the voltage of other piezoelectric elements 1321 to ensure overall deformation accuracy. At the same time, the control module can sample the current changes of each piezoelectric element 1321 (indirectly reflecting the deformation) and correct the output voltage in real time to ensure that the error between the actual deformation and the target value can be eliminated.

[0045] In one embodiment, the support unit 131 includes: Partition 1311, partition 1311 and rigid shell 11 enclose a mounting cavity, partition 1311 and rigid shell 11 and flexible shell 12 enclose a deformation cavity; and Multiple elastic support ribs 1312 are evenly distributed circumferentially. The cross-section of the elastic support ribs 1312 is arc-shaped. One end of the elastic support rib 1312 is fixedly connected to the side of the partition 1311 near the flexible shell 12, and the other end is fixedly attached to the inner surface of the flexible shell 12.

[0046] It should be noted that the partition 1311 is a flat plate structure made of polycarbonate (PC) or ABS engineering plastic. Its shape is adapted to the inner contour of the rigid shell 11. Its edges are fixedly connected to the inner wall of the rigid shell 11 by snap-fit, welding or gluing to form a sealed "installation cavity" and "deformation cavity".

[0047] The elastic support ribs 1312 are 3-6 (preferably 4 to ensure balanced circumferential force) strip structures evenly distributed circumferentially along the edge of the partition 1311. They can be made of silicone or thermoplastic elastomer (TPE), and the cross-section of the elastic support ribs 1312 is arc-shaped, that is, the arc protrudes away from the center of the deformation cavity, and the root is slightly thicker to enhance strength. One end (root) of the elastic support rib 1312 is fixed to the side of the partition 1311 facing the deformation cavity by injection molding or high-strength silicone adhesive, and the other end is fixedly attached to the inner surface of the flexible shell 12 (corresponding to the edge position of the clamping area) in the same way.

[0048] In this embodiment, when a user wears the headphones, the clamping area of ​​the flexible shell 12 contacts the ear, generating initial pressure, and the elastic support rib 1312 is in a naturally extended state (the arc maintains its initial curvature). When the sensing unit detects that the pressure in a certain area is too high, the adjusting unit 13 drives the corresponding airbag 1331 to deform. Under the pressure of the ear, the flexible shell 12 is concave towards the inside of the deformation cavity, the support rib corresponding to that area is compressed, the arc becomes gentler, and an upward elastic force is generated to buffer the local pressure. When the pressure in a certain area is detected to be too low, the adjusting unit 13 drives the corresponding airbag 1331 to deform, driving the flexible shell 12 to bulge outward, causing the corresponding support rib to be stretched, the arc curvature to increase, providing a downward pulling force to assist in fixation and prevent the bulging part from shaking. Throughout the adjustment process, the partition 1311 remains stable, ensuring that the driving components in the mounting cavity are not affected by deformation. The elastic support rib 1312, through the uniform distribution of elastic force, makes the deformation of the flexible shell 12 smoother, further improving the fit and comfort of wearing.

[0049] In one embodiment, the sensing unit includes: A flexible circuit board is attached to the inner wall of the flexible housing 12. A pressure sensing unit is located on the side of the flexible circuit board facing the flexible housing 12. The pressure sensing unit includes multiple pressure sensors arranged in an array. The sensing ends of the pressure sensors abut against the inner wall of the flexible housing 12 and are configured to detect localized pressure in the clamping area. The signal processing unit is located on the side of the flexible circuit board away from the flexible housing 12 and is electrically connected to the pressure sensing unit. The signal processing unit is configured to summarize the local pressures of the clamping area to generate pressure distribution information and output control signals.

[0050] In this embodiment, the flexible circuit board, serving as the carrier and circuit connection base for the sensing element, is made of polyimide (PI) substrate, possessing excellent flexibility and temperature resistance, and can perfectly conform to the arc-shaped contour of the inner wall of the flexible housing 12. In the design, the area of ​​the flexible circuit board is slightly smaller than the clamping area of ​​the flexible housing 12, and the edges are rounded to prevent sharp edges from abrading the flexible housing 12. A sensor pad is provided on the side of the flexible circuit board facing the flexible housing 12 for soldering the pressure sensor. The side of the flexible circuit board away from the flexible housing 12 has mounting pads for the signal processing unit and wires; the wires are gold-plated to improve conductivity and oxidation resistance. Furthermore, the flexible circuit board is completely bonded and fixed to the inner wall of the flexible housing 12 with adhesive, corresponding to the center area of ​​the clamping region. The bonding surface can be ensured to be bubble-free using a roller pressing process, ensuring that pressure can be transmitted from the flexible housing 12 to the pressure sensor without loss.

[0051] The pressure sensing unit is an array-distributed pressure detection component that directly contacts the flexible housing 12 to acquire local pressure signals. The pressure sensor can be a resistive flexible thin-film pressure sensor (such as the FSR series), and multiple sensors are arranged in a rectangular, circular, or elliptical array according to the shape of the clamping area to cover more than 90% of the area of ​​the flexible housing 12's clamping region. The edge of the pressure sensing unit maintains a distance of 1mm-1.5mm from the edge of the flexible housing 12's clamping region to avoid edge deformation interfering with detection accuracy. During installation, the center position of each pressure sensor corresponds one-to-one with the action point of the adjustment unit 13 or the drive unit 132 to ensure that the pressure detection and adjustment positions are matched. The electrodes of each pressure sensor are soldered to corresponding pads on the front side of the flexible circuit board using conductive silver paste, and then encapsulated with epoxy resin to prevent sweat or moisture intrusion. The sensing end (detection surface) of the sensor directly abuts (without gap) against the inner wall of the flexible housing 12. When the flexible housing 12 deforms due to pressure from the ear, the pressure acts directly on the sensing end of the sensor, causing a change in its resistance.

[0052] The signal processing unit is the "data hub" of the sensing unit, responsible for acquiring, processing, and outputting pressure signals and control signals. The signal processing unit typically includes a low-power MCU (such as the Nordic RF52832, supporting Bluetooth communication), multiple signal conditioning circuitry (including operational amplifiers and filters), an A / D conversion module (12-bit resolution), and a power management unit. These components are soldered to pre-drilled pads on the back of a flexible circuit board using surface mount technology (SMT). The signal conditioning circuitry is electrically connected to each pressure sensor via internal wires on the flexible circuit board. Each circuit channel corresponds to one pressure sensor, enabling independent signal acquisition and avoiding crosstalk.

[0053] In this embodiment, when a user wears the headphones, the clamping area of ​​the flexible shell 12 comes into contact with the ear, generating pressure. This pressure is transmitted through the flexible shell 12 to each pressure sensor in the pressure sensing unit. Each pressure sensor outputs a corresponding resistance change signal based on the magnitude of the pressure, which is converted into a voltage signal by the signal conditioning circuit. The MCU of the signal processing unit collects the voltage signals from all sensors in real time and calculates the pressure distribution matrix. After analyzing the matrix, the MCU determines the location of the abnormal pressure area and the required adjustment range, and generates a control signal, which is sent to the adjustment unit 13. After the adjustment unit 13 drives the flexible shell 12 to deform according to the control signal, the sensing unit repeats the above detection process until the pressure values ​​of all areas in the pressure distribution matrix are within the comfortable range of 0.8-1.5N, forming a closed-loop adjustment. Through the above design, the sensing unit can accurately capture the pressure distribution details of the clamping area of ​​the flexible shell 12, and its compact structural design can adapt to the miniaturization requirements of headphones.

[0054] In one embodiment, the pressure sensor includes a micro-resistor and an elastic protrusion electrically connected to the micro-resistor; the micro-resistor is disposed on the side of the flexible circuit board facing the flexible housing 12; at least a portion of the elastic protrusion protrudes from the flexible circuit board and abuts against the inner sidewall of the flexible housing 12, and the elastic protrusion is configured to transmit local pressure to the micro-resistor; the signal processing unit includes an analog multiplexer and a microcontroller, the analog multiplexer is configured to sequentially scan the resistance changes of each micro-resistor and output the scan results, and the microcontroller is configured to generate a control signal based on the scan results.

[0055] In this embodiment, the pressure sensor is a single, independent pressure detection unit, composed of a micro-resistor and an elastic protrusion, which work together to convert pressure into an electrical signal. The micro-resistor is made of graphene-doped silicone rubber composite material, exhibiting force-sensitive characteristics; that is, under pressure, the density of internal conductive pathways increases, and the resistance decreases significantly with increasing pressure. The micro-resistor is typically circular, with silver electrodes formed on its upper and lower surfaces using a magnetron sputtering process. The electrode leads are soldered to pads on the front side of the flexible circuit board using conductive adhesive, achieving electrical connection with the signal processing unit. The micro-resistor is fixed to the side of the flexible circuit board facing the flexible housing 12 using UV adhesive, ensuring a bubble-free bonding surface with the flexible circuit board and stable mechanical transmission.

[0056] The elastic protrusion is made of silicone and has an overall "T" shape, which means it has a circular base and a hemispherical protrusion. The circular base is completely attached to the upper surface of the micro-force-sensitive element by silicone adhesive, and the hemispherical protrusion protrudes from the surface of the flexible circuit board to ensure that the deformation pressure of the flexible shell 12 can be completely transmitted to the micro-force-sensitive element. Its elasticity can buffer instantaneous pressure impact (such as rapid contact during wear) to prevent the micro-force-sensitive element from being damaged due to excessive stress. At the same time, it amplifies the pressure signal through deformation. That is, when the protrusion is deformed by pressure, the dispersed surface pressure is converted into concentrated point pressure and transmitted to the resistor.

[0057] The signal processing unit is integrated on the side of the flexible circuit board away from the flexible housing 12. It achieves efficient signal acquisition and processing through an "analog multiplexer + microcontroller" architecture. The analog multiplexer uses a multi-channel CMOS analog switch chip (such as CD4051). Its input is connected to the resistive electrodes of multiple pressure sensors via wires on the flexible circuit board, and its output is connected to the analog signal input of the microcontroller. Under the control of the microcontroller, different channels are sequentially selected via address lines, allowing the resistance change signals of each pressure sensor to be transmitted to the microcontroller in sequence. This enables a single-channel ADC to perform time-division scanning of multiple sensors, significantly reducing circuit complexity and power consumption.

[0058] The microcontroller uses a low-power MCU (such as STM32L431) with a built-in 12-bit ADC, UART communication interface, and GPIO pins, and is soldered to the pads on the back of the flexible circuit board using SMT technology. During operation, the control analog multiplexer sequentially selects each channel, and the ADC acquires the voltage signal corresponding to the resistance change of the sensor. Each sampling lasts 20μs, and each sensor is sampled three times consecutively, with the average value taken for noise reduction. Subsequently, the voltage signal is converted into the actual pressure value using a built-in calibration curve (e.g., pre-stored voltage values ​​corresponding to pressures from 0.1 to 3N), generating a pressure distribution matrix. The pressure distribution matrix is ​​then compared with a preset comfort threshold to mark abnormal pressure areas, calculate the adjustment amount for each abnormal area, and output control signals, such as area coordinates and adjustment amount, to the adjustment unit 13 via the UART interface.

[0059] When a user wears the headphones, the clamping area of ​​the flexible shell 12 comes into contact with the ear, generating pressure. This pressure is transmitted through the flexible shell 12 to the elastic protrusion. The elastic protrusion deforms under pressure and concentrates the local pressure, transmitting it to the micro-force-sensitive resistor. The resistance of the micro-force-sensitive resistor decreases as the pressure increases. Under the control of the microcontroller, the analog multiplexer sequentially scans all the pressure sensors, converting the resistance changes into voltage signals. Subsequently, the microcontroller acquires the voltage signals, converts them into pressure values, and generates a pressure distribution matrix, identifying the coordinates. For example, the pressure at coordinate (2,2) is 2.1N (too high), and the pressure at coordinate (4,1) is 0.7N (too low). The microcontroller generates control signals, such as "(2,2), reduce pressure by 0.6N; (4,1), increase pressure by 0.2N", which are sent to the adjustment unit 13 via UART. After the adjustment unit 13 performs the adjustment, the sensing unit repeats the above process until the pressure in all areas stabilizes within the preset range, forming a closed-loop control.

[0060] The pressure sensor and signal processing unit in this embodiment utilize a combination of a "micro-force-sensitive element + elastic protrusion" structure. The elastic protrusion converts the surface pressure of the flexible shell 12 into concentrated point pressure, which is then transmitted to the micro-force-sensitive element. Combined with the high-sensitivity material properties, it can accurately capture pressure changes within different ranges. Simultaneously, the elastic protrusion made of silicone material can buffer instantaneous pressure impacts, preventing sensor damage. The signal processing unit employs an analog multiplexer to perform time-division scanning of multiple sensors. Single-channel processing can complete the full array detection, simplifying the circuit structure and reducing power consumption compared to traditional solutions. Combined with the fast processing capabilities of the microcontroller, it helps extend the headphone's battery life while ensuring real-time response. Furthermore, the sensor array layout precisely corresponds to the driving unit 132 of the adjustment unit 13. With the help of a noise filtering algorithm, it ensures the coordination between pressure detection and adjustment, effectively solving problems such as insufficient accuracy, excessive power consumption, and poor adaptability in traditional designs. Ultimately, through accurate pressure sensing and efficient signal processing, it provides a reliable basis for the adjustment unit 13, significantly improving the fit and comfort of the headphone.

[0061] In one embodiment, the Bluetooth headset 100 includes two clamping heads 1, which are a first clamping head 1 and a second clamping head 1, respectively. The flexible shell 12 of the first clamping head 1 is configured to abut against the cavity wall of the user's concha, and the flexible shell 12 of the second clamping head 1 is configured to abut against the back side of the user's auricle. The Bluetooth headset 100 also includes an elastic connection part 2, a sound-generating device, and a power supply device. The elastic connection part 2 is connected to the rigid housing 11 of the first clamping head 1 and the rigid housing 11 of the second clamping head 1 respectively. A wiring channel is formed inside the elastic connection part 2. The sound-generating device is located in the receiving cavity of the first clamping head 1. The power supply device is located in the receiving cavity of the second clamping head 1. The power supply line of the power supply device passes through the wiring channel and is electrically connected to the sound-generating device.

[0062] In this embodiment, the elastic connecting part 2 serves as a connecting medium between the two clamping heads 1, combining structural support and wiring functions. It is injection molded from thermoplastic elastomer (TPE) and has an overall "U"-shaped arc structure, allowing it to deform with the wearing motion to accommodate different ear thicknesses. The internal wiring channel of the elastic connecting part 2 is a through circular channel along its central axis, with its two ends aligned with the wiring holes of the two clamping heads 1, forming a concealed path for the power supply cable and preventing wear or snagging caused by exposed wires. Both ends of the elastic connecting part 2 have protrusions that match the snap-fit ​​grooves of the clamping heads 1, and are fixedly connected to the snap-fit ​​grooves of the two rigid housings 11 through an interference fit. Sealant is applied to the connection points to prevent sweat from seeping in.

[0063] The sound-generating device employs a miniature dynamic loudspeaker, which is fixed to the side of the receiving cavity of the first clamping head 1 near the ear canal via a shock-absorbing silicone pad. The loudspeaker's sound outlet is located in the rigid housing 11 and faces the direction from the concha cavity to the ear canal, and the sound outlet is covered with a dustproof mesh. The loudspeaker's lead wire is connected to the control circuit board inside the receiving cavity, and then connected to the power supply wire through the control circuit board.

[0064] The power supply unit includes a battery and a power management module, both of which are fixed to the bottom of the receiving cavity of the second clamping head 1 with adhesive. The battery output is connected to the power management module (including overcharge and over-discharge protection circuits) via wires. The output wires of the management module pass through the wiring channel of the flexible connection part 2 and are connected to the control circuit board of the first clamping head 1 to provide power to the sound-generating device and various adjustment and sensing components. Additionally, it should be noted that the sensing part and adjustment part 13 mentioned above can also be electrically connected to the power supply unit via a flexible circuit board.

[0065] When the user wears the device, the flexible shell 12 of the first clamping head 1 fits against the cavity wall of the concha, and the flexible shell 12 of the second clamping head 1 fits against the back of the auricle. The elastic connecting part 2 generates a rebound force due to the gap between the two clamping heads 1, so that the two flexible shells 12 naturally clamp the ear. Since the concha and the back of the auricle are two opposite stress points of the ear, the bidirectional clamping can disperse the pressure and avoid the local pressure of the traditional single clamping head 1. The sound generating device is close to the ear canal, the sound transmission path is short and the loss is small, and the power supply device is placed independently to make the overall weight distribution balanced and reduce the feeling of heaviness when wearing the device.

[0066] The two-way clamping design significantly improves the stability of the headphones when worn. The elastic connection part 2 balances adaptability and structural cleanliness. The partitioned arrangement of components achieves weight balance and reduces local pressure. At the same time, the hidden wiring improves the product's aesthetics and safety, thus enhancing the overall wearing comfort and practicality of the headphones.

[0067] In one embodiment, the outer surface of the clamping area of ​​the flexible shell 12 is provided with multiple anti-slip particles, which are distributed in a dot matrix pattern. The height of the anti-slip particles is A, where 0.1 mm ≤ A ≤ 0.5 mm; or The outer surface of the clamping area of ​​the flexible shell 12 is provided with multiple anti-slip strips. The multiple anti-slip strips are distributed in a continuous stripe or grid pattern, and the depth of the anti-slip strips is B, 0.2mm≤B≤0.8mm.

[0068] In this embodiment, when anti-slip particles are provided, the dot-matrix distribution of particles increases the contact friction between the flexible shell 12 and the ear skin. The height of 0.1-0.5mm can form an effective concave-convex contact without causing ear discomfort due to excessively high particles. When anti-slip strips are provided, the continuous stripes or grid structure can enhance surface grip through interlocking textures. The depth of 0.2-0.8mm can improve the anti-slip effect in a sweaty environment without irritating the skin. Through the above features, the anti-slip particles or anti-slip strips can significantly increase the coefficient of friction between the flexible shell 12 and the ear, reducing relative slippage. Combined with the fit adjustment function of the adjustment part 13, the stability of wearing the headphones is further improved. At the same time, the reasonable size design ensures that the anti-slip structure does not affect the deformation adaptability of the flexible shell 12, and avoids causing additional pressure or discomfort to the ear, thus balancing anti-slip effect and wearing comfort.

[0069] The present invention also provides an earphone assembly, which includes a Bluetooth earphone 100 and a charging case; the charging case has a receiving groove adapted to the shape of the Bluetooth earphone 100, and the inner wall of the receiving groove is provided with elastic charging contacts corresponding to the charging interface of the Bluetooth earphone 100. The specific structure of the Bluetooth earphone 100 is as described in the above embodiments. Since this earphone assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0070] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A Bluetooth headset, characterized in that, The Bluetooth headset includes at least one clamping head, the clamping head comprising: Rigid shell; A flexible shell, together with the rigid shell, forms a receiving cavity, the receiving cavity being configured to accommodate a sound-generating device or a power supply device, and the flexible shell having a clamping area that abuts against the cavity wall of the user's concha or the back of the auricle when worn; A sensing unit, housed within the receiving cavity, configured to acquire pressure distribution information of the clamping area and output a control signal based on the pressure distribution information; and An adjustment unit is located in the accommodating cavity and is communicatively connected to the sensing unit. The adjustment unit is configured to receive the control signal and drive the flexible shell to deform into a shape that fits against the cavity wall of the user's concha or the back of the auricle according to the control signal.

2. The Bluetooth headset as described in claim 1, characterized in that, The adjustment unit includes: The support unit is fixedly connected to the rigid shell; A drive unit, disposed on the support unit and communicatively connected to the sensing unit, is configured to receive the control signal and output a driving force; and A deformation unit, which is connected to the drive unit, is configured to change shape under the action of the drive force to drive the flexible shell to deform toward the cavity wall of the user's concha or the back of the auricle.

3. The Bluetooth headset as described in claim 2, characterized in that, The deformation unit includes multiple independently arranged airbags; the airbags are configured to abut against the clamping area of ​​the flexible shell; The driving unit includes a plurality of piezoelectric driving structures, each corresponding to one of the multiple airbags. Each piezoelectric driving structure includes a piezoelectric actuator, a transmission component, and a control module. The piezoelectric actuator is fixed to the support unit and communicatively connected to the sensing unit. The transmission component drives the piezoelectric actuator and the airbag. The control module is electrically connected to the piezoelectric actuator and is configured to adjust the voltage applied to the piezoelectric actuator according to the control signal to control the deformation of the piezoelectric actuator, thereby realizing the inflation or deflation of the airbag.

4. The Bluetooth headset as described in claim 3, characterized in that, The piezoelectric actuator includes multiple piezoelectric elements stacked in the deformation direction, and the control module is configured to adjust the voltage applied to different piezoelectric elements.

5. The Bluetooth headset as described in claim 2, characterized in that, The support unit includes: A partition, wherein the partition and the rigid shell enclose a mounting cavity, and the partition, the rigid shell, and the flexible shell enclose a deformation cavity; and Multiple elastic support ribs are evenly distributed circumferentially. The cross-section of each elastic support rib is arc-shaped. One end of each elastic support rib is fixedly connected to the side of the partition plate near the flexible shell, and the other end is fixedly attached to the inner surface of the flexible shell.

6. The Bluetooth headset as described in claim 1, characterized in that, The sensing element includes: A flexible circuit board, wherein the flexible circuit board is attached to the inner wall of the flexible housing; A pressure sensing unit is disposed on the side of the flexible circuit board facing the flexible housing. The pressure sensing unit includes multiple pressure sensors arranged in an array. The sensing ends of the pressure sensors abut against the inner wall of the flexible housing and are configured to detect local pressure in the clamping area. A signal processing unit is disposed on the side of the flexible circuit board away from the flexible housing and is electrically connected to the pressure sensing unit. The signal processing unit is configured to summarize the local pressures of the clamping area to generate the pressure distribution information and output the control signal.

7. The Bluetooth headset as described in claim 6, characterized in that, The pressure sensor includes a micro-force-sensitive element and an elastic protrusion electrically connected to the micro-force-sensitive element; the micro-force-sensitive element is disposed on the side of the flexible circuit board facing the flexible housing; at least a portion of the elastic protrusion protrudes from the flexible circuit board and abuts against the inner wall of the flexible housing, and the elastic protrusion is configured to transmit local pressure to the micro-force-sensitive element. The signal processing unit includes an analog multiplexer and a microcontroller. The analog multiplexer is configured to sequentially scan the resistance changes of each of the micro-force-sensitive resistors and output the scan results. The microcontroller is configured to generate the control signal based on the scan results.

8. The Bluetooth headset as described in any one of claims 1 to 7, characterized in that, The Bluetooth headset includes two clamping heads, namely a first clamping head and a second clamping head. The flexible shell of the first clamping head is configured to abut against the cavity wall of the user's concha, and the flexible shell of the second clamping head is configured to abut against the back of the user's auricle. The Bluetooth headset further includes an elastic connector, a sound-generating device, and a power supply device. The elastic connector is connected to the rigid housing of the first clamping head and the rigid housing of the second clamping head, respectively, and a wiring channel is formed inside the elastic connector. The sound-generating device is disposed in the receiving cavity of the first clamping head. The power supply device is disposed in the receiving cavity of the second clamping head, and the power supply line of the power supply device passes through the wiring channel and is electrically connected to the sound-generating device.

9. The Bluetooth headset as described in any one of claims 1 to 7, characterized in that, The outer surface of the clamping area of ​​the flexible shell is provided with multiple anti-slip particles, which are distributed in a dot matrix pattern. The height of each anti-slip particle is A, where 0.1mm ≤ A ≤ 0.5mm; or The outer surface of the clamping area of ​​the flexible shell is provided with multiple anti-slip strips, which are distributed in a continuous stripe or grid pattern. The depth of the anti-slip strip is B, where 0.2mm≤B≤0.8mm.

10. An earphone assembly, characterized in that, include: Bluetooth headset as described in any one of claims 1 to 9; and The charging case has a receiving slot adapted to the shape of the Bluetooth headset, and the inner wall of the receiving slot is provided with elastic charging contacts corresponding to the charging interface of the Bluetooth headset.

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