Elastic material applied to Bluetooth equipment, Bluetooth equipment and storage box

Abstract

The invention discloses an elastic material applied to Bluetooth equipment, the Bluetooth equipment and a storage box, a sheet-shaped base material has residual stress in a flattened state, so that the material can be effectively prevented from being spontaneously bent due to external slight disturbance, the sheet-shaped base material can be kept stable in the flattened state, and the Bluetooth equipment is convenient to place and store. And secondly, the cross section of the sheet-shaped base material is an arc-shaped curved surface, and the radian diameter of the arc-shaped curved surface is 15mm-25mm, so that the diameter of the inner arc surface of the sheet-shaped base material corresponds to the diameter of the original circular structure when the sheet-shaped base material is in a bending state, the geometric certainty of a material deformation path is ensured, and the sheet-shaped base material can still keep the shape recovery rate greater than 95% after 104-105 times of bending circulation due to the design.

Description

Technical Field

[0001] The present invention relates to the technical field of Bluetooth devices, and more specifically, to an elastic material applied to Bluetooth devices, Bluetooth devices and a storage box. Background Art

[0002] At present, Bluetooth devices such as clip-on Bluetooth headsets and Bluetooth rings are all embedded with elastic materials to clamp and fix on specific parts of the human body. For example, the most common clip-on Bluetooth headset on the market generally uses a U-shaped waist end to complete the clamping, and two relatively large ends are respectively arranged at both ends of the waist end, and a sound unit and a circuit unit are respectively arranged in the ends. The two ends are opened and closed by the waist end, so as to facilitate clamping on the human auricle. For another example, a Chinese invention patent with patent announcement number CN218976808U discloses a two-end clip-on Bluetooth headset, which includes: a shell, the shell has a first head end and a second head end, and the first head end and the second head end are connected by a waist end; a sound guide structure, the sound guide structure connects the internal space of the first head end and the second head end, and when using the headset, the two ends can be opened and clamped to the auricle by elasticity, without plugging it into the ear canal.

[0003] Although the ear-clip earphones are ergonomically designed to adapt to the auricle shapes of different users, the elastic clips of existing ear-clip Bluetooth earphones lack sufficient ductility and adjustment capabilities and cannot perfectly fit everyone's auricle, especially for users with small auricles or special shapes.

[0004] The deformation path of traditional elastic materials in a bent state often lacks clear geometric certainty, which makes the material prone to irreversible plastic deformation after multiple bending. Specifically, when the material is bent by external force, due to the uneven distribution of internal stress, local areas may be overstretched or compressed, eventually causing the shape of the material to change. This phenomenon not only reduces the service life of the elastic material, but also easily leads to a decrease in the wearing comfort of Bluetooth devices.

[0005] Traditional elastic materials cannot maintain their good performance in their initial state after a large number of bending cycles. Their shape recovery rate is generally low, making it difficult to meet the long-term stability requirements of Bluetooth devices. The low shape recovery rate means that the elastic material gradually loses its elasticity during use, ultimately affecting the overall performance of the device. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides an elastic material applied to a Bluetooth device to solve the problem of poor shape stability of the prior elastic material.

[0007] The technical solution of the present invention is as follows: An elastic material applied to a Bluetooth device, comprising:

[0008] A sheet-shaped substrate; the sheet-shaped substrate switches between a flattened state and a bent state through deformation, and the cross-section of the sheet-shaped substrate is an arc-shaped curved surface, and the radian diameter of the arc-shaped curved surface is 15 mm to 25 mm, so that it has residual stress inside in the flattened state to maintain the flattened state;

[0009] Wherein, the sheet-shaped substrate is formed by cutting from a complete circular structure. When the sheet-shaped substrate is in a bent state, the inner arc surface diameter of the sheet-shaped substrate is equal to the inner diameter of the circular structure.

[0010] Further, the sheet-shaped substrate is selected from any one of spring steel or carbon steel.

[0011] Further, the diameter of the circular structure of the sheet-shaped substrate is 0.12 mm to 0.15 mm.

[0012] Further, the width of the sheet-shaped substrate is 8 mm to 12 mm.

[0013] Further, the inner diameter of the circular structure is 18 mm to 28 mm.

[0014] Further, the width of the sheet-shaped substrate is 8 mm to 10 mm.

[0015] Further, the inner diameter of the circular structure is 21 mm to 24 mm.

[0016] Further, the sheet-shaped substrate is formed by cutting from the complete circular structure through a laser cutting or precision stamping process.

[0017] A Bluetooth device, which includes the above-mentioned elastic material.

[0018] A storage box for a Bluetooth device, including a box body, and a receiving groove is arranged in the box body, and the receiving groove is used to place the above-mentioned Bluetooth device.

[0019] According to the above solution of the present invention, its beneficial effects are as follows:

[0020] (1) An elastic material applied to a Bluetooth device provided by the present invention, the sheet-shaped substrate has residual stress in the flattened state, which can effectively prevent the material from spontaneously bending due to slight external disturbances, so that the sheet-shaped substrate can maintain stability in the flattened state, facilitating the placement and storage of the Bluetooth device.

[0021] (2) An elastic material applied to a Bluetooth device provided by the present invention, the cross-section of the sheet-shaped substrate is an arc-shaped curved surface, and the arc diameter of the arc-shaped curved surface is 15 mm to 25 mm, so that the inner arc surface diameter of the sheet-shaped substrate in the bent state corresponds to the diameter of the original circular structure, ensuring the geometric certainty of the material deformation path. With such a design, the sheet-shaped substrate can still maintain a shape recovery rate of more than 95% after 10 4 ~10 5 bending cycles, which is far superior to ordinary spring steel and conventional shape memory alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the elastic material in the flat state in the embodiment of the present invention;

[0024] Figure 2 It is a schematic cross-sectional structure diagram of the sheet-shaped substrate in the embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the elastic material in the bent state in the embodiment of the present invention;

[0026] Figure 4 It is a front view of the sheet-shaped substrate in the bent state in the embodiment of the present invention;

[0027] Figure 5 It is a side view of the sheet-shaped substrate in the bent state in the embodiment of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the circular structure in the embodiment of the present invention; Figure 7 It is a curve graph showing the change of the strain energy E inside the connecting arm with the radius curvature.

[0029] In the figure, 1, sheet-shaped substrate; 2, circular structure; R1, arc diameter of the arc-shaped curved surface; W1, width of the sheet-shaped substrate; R2, inner arc surface diameter of the sheet-shaped substrate. DETAILED DESCRIPTION OF THE INVENTION

[0030] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following detailed description of the examples and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments. It should be noted that when a component is referred to as "fixed" or "set" or "connected" to another component, it can be directly or indirectly located on the other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the accompanying drawings, and are only for the convenience of description and cannot be construed as a limitation to the technical solution of the present application.

[0031] To better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0032] See Figure 1 and Figure 2 As shown, an elastic material applied to a Bluetooth device provided by an embodiment of the present invention includes a sheet-shaped substrate 1; the sheet-shaped substrate 1 switches between a flattened state and a bent state through deformation, and the cross-section of the sheet-shaped substrate 1 is an arc-shaped curved surface, and the radian diameter R1 of the arc-shaped curved surface is 15 mm to 25 mm, so that there is residual stress inside it in the flattened state to maintain the flattened state; wherein, the sheet-shaped substrate 1 is formed by cutting a complete circular structure 2, and when the sheet-shaped substrate 1 is in the bent state, the inner arc surface diameter R2 of the sheet-shaped substrate is equal to the inner diameter of the circular structure.

[0033] In this embodiment, the cross-section of the sheet-shaped substrate in the bent state is a straight line.

[0034] Specifically, the cross-section of the sheet-shaped substrate 1 is an arc-shaped curved surface, and the radian diameter R1 of the arc-shaped curved surface is 15 mm to 25 mm. Such a design makes the sheet-shaped substrate 1 have residual stress inside it in the flattened state, so as to ensure that the sheet-shaped substrate 1 remains in the flattened state.

[0035] By utilizing the residual stress inside the material to resist external slight disturbances, the sheet-shaped substrate 1 is more stable in the flattened state, thus facilitating the placement and storage of Bluetooth devices.

[0036] Secondly, the cross-section of the sheet-shaped substrate 1 is designed as an arc-shaped curved surface, and its radian diameter is set within the range of 15 mm to 25 mm. This design not only helps to improve the shape recovery rate of the sheet-shaped substrate 1, but also ensures the geometric certainty of the bending path. When the sheet-shaped substrate 1 is in a bent state, the inner arc surface diameter is equal to the inner diameter of the original circular shape structure. This ensures that the material will not undergo uncontrollable deformation during the bending process, while enhancing the durability of the material. This geometric design can effectively extend the service life of the sheet-shaped substrate 1 and enable it to maintain a shape recovery rate of more than 95% after multiple bends.

[0037] Preferably, the sheet-shaped substrate 1 is selected from any one of spring steel or carbon steel.

[0038] When spring steel is selected as the production material of the sheet-shaped substrate 1, the carbon content of the spring steel ranges from 0.6% to 0.9% to balance the hardness and toughness of the material. Specifically, a carbon content gradient distribution is introduced into the sheet-shaped substrate 1 through laser cladding or thermal diffusion process. The carbon content on the surface layer of the sheet-shaped substrate 1 is close to 0.9%, and the carbon content in the core of the sheet-shaped substrate 1 is 0.6%. Thus, the surface layer of the sheet-shaped substrate 1 has anti-wear properties, and the core has anti-fracture properties, which can effectively extend the service life of the sheet-shaped substrate 1.

[0039] When carbon steel is selected as the production material of the sheet-shaped substrate 1, the carbon steel sheet-shaped substrate 1 is first heated to 850°C to 900°C and held for a period of time to allow carbon to fully dissolve in austenite, and then rapidly cooled for isothermal quenching to obtain lower bainite structure, thereby significantly improving the strength and toughness of the material and improving its bending performance and shape recovery ability.

[0040] It is worth mentioning that the sheet-shaped substrate in this application is in an arc-shaped bent state when bent, and is formed by cutting from a circular shape structure. By processing the circular shape structure, the sheet-shaped substrate can be flattened to switch from the bent state to the flattened state. When the sheet-shaped substrate is in the flattened state, along the length direction of the sheet-shaped substrate, the two side edges of the sheet-shaped substrate are warped to form an arc-shaped groove inside the sheet-shaped substrate to ensure that there is residual stress inside the sheet-shaped substrate to maintain the flattened state. To further explain, this application also provides the processing technology of the sheet-shaped substrate, which is as follows:

[0041] (1) Pre-forming treatment of the circular matrix:

[0042] Select a metal ring with elastoplastic deformation ability as the matrix of the circular shape structure, the material is spring steel or carbon steel, the thickness of the circular shape structure is 0.12 mm to 0.15 mm, and the diameter of the circular shape structure is 18 mm to 28 mm; symmetric pre-bending processing is carried out on both side edge regions of the circular shape structure:

[0043] a. Apply continuous pressure to the metal ring circumferentially using a three-roll plate rolling machine, and through a multi-roll continuous rolling process, form a symmetric pre-bending structure at both edges of the metal ring;

[0044] b. Monitor the bending curvature in real time through laser scanning, and dynamically adjust the roll pressure so that the cross-sectional curvature deviation is less than or equal to 0.5%.

[0045] (2) Stress field controlled heat treatment:

[0046] Conduct staged heat treatment under inert gas protection:

[0047] a. The first stage: Heat at a rate of 10 - 15 °C / min to 850 °C - 900 °C and hold for 20 - 30 minutes;

[0048] b. The second stage: Quench in water at a rate of 5 - 8 °C / s to 150 °C - 200 °C to form a compressive residual stress layer circumferentially on the metal ring;

[0049] c. The third stage: Conduct aging treatment at 300 °C - 350 °C for 2 - 4 hours to eliminate the peak fluctuation of quenching stress.

[0050] (3) Dynamic flattening stress release:

[0051] Fix the arc-shaped sheet substrate to the flattening fixture and apply axial tensile force to expand the substrate into a flat state;

[0052] During the flattening process, the two edges of the sheet substrate warp due to residual stress, so that long strip-shaped arc-shaped grooves extending along the length direction are formed in the sheet substrate;

[0053] (4) Morphology locking treatment:

[0054] Conduct local pulsed laser shock peening on the flattened sheet substrate:

[0055] a. The laser energy density is 5 - 8 J / cm 2 , the pulse width is 10 ns - 20 ns, and a nanocrystalline strengthening layer with a depth of 50 μm - 100 μm is formed at the bottom of the arc-shaped groove;

[0056] b. The grain size in the impact area is refined to 50 nm - 200 nm, and the microhardness is increased by 20% - 30%;

[0057] After strengthening, the flattened sheet substrate maintains the flattened shape in the free state, the structural stability of the arc-shaped groove reaches, and after 1000 bending - flattening cycle tests, the groove depth change rate is less than 3%.

[0058] In this embodiment, during the processing of the sheet substrate, internal residual stress is generated due to non-uniform plastic deformation and temperature gradient. In the bent state, compressive stress with a gradient distribution is formed on the surface layer and inside of the material. When it is flattened, the residual stress is gradually released. Due to the gradient distribution, the springback amounts of the surface layer and the inner layer are different, resulting in deformation on both sides and forming warping. In the sheet substrate of the present application, arc chamfers or 45° bevel chamfers are provided at the four corners, and a local stiffening rib effect is formed in the chamfered area, improving the torsional stiffness of the four corners, thereby being able to suppress torsional deformation.

[0059] Embodiment 1

[0060] An elastic material provided in this Embodiment 1 is applied to an ear-clamping Bluetooth headset. The ear-clamping Bluetooth headset includes a connecting arm, a sound-emitting unit and a battery unit that are electrically connected through a wire passing through the inside of the connecting arm.

[0061] Specifically, the connecting arm includes a flexible housing, an elastic material and a flexible circuit. The elastic material and the flexible circuit are both arranged inside the flexible housing. With such a design, the connecting arm can switch between a flattened state and a bent state through deformation, and when there is no external force or the applied external force is less than the critical deformation force, the connecting arm remains in the current state. When the connecting arm is in the bent state, an ear auricle clamping space for clamping the ear auricle is formed between the sound-emitting unit and the battery unit. The size of the ear auricle clamping space is adjusted by bending the connecting arm to change the relative position between the sound-emitting unit and the battery unit so as to clamp the ear auricle.

[0062] In this Embodiment 1, the elastic material includes a sheet substrate 1. The sheet substrate 1 switches between a flattened state and a bent state through deformation. The cross-section of the sheet substrate 1 is an arc-shaped curved surface, and the radian diameter R1 of the arc-shaped curved surface is 15 mm to 25 mm, so that it has internal residual stress in the flattened state to maintain the flattened state. Among them, the sheet substrate 1 is formed by cutting from a complete circular structure 2. When the sheet substrate 1 is in the bent state, the inner arc surface diameter R2 of the sheet substrate is equal to the inner diameter of the circular structure.

[0063] Specifically, the cross-section of the sheet substrate 1 is an arc-shaped curved surface, and the radian diameter R1 of the arc-shaped curved surface is 15 mm to 25 mm. With such a design, the sheet substrate 1 has internal residual stress in the flattened state, thereby being able to ensure that the sheet substrate 1 remains in the flattened state. By utilizing the internal residual stress of the material to resist external slight disturbances, the sheet substrate 1 is more stable in the flattened state, thus facilitating the placement and storage of the Bluetooth device.

[0064] Specifically, the cross-section of the sheet-shaped substrate 1 is designed as an arc-shaped curved surface, and its radian diameter is set within the range of 15 mm to 25 mm. This design not only helps to improve the shape recovery rate of the sheet-shaped substrate 1 but also ensures the geometric certainty of the bending path. When the sheet-shaped substrate 1 is in a bent state, the inner arc surface diameter is equal to the inner diameter of the original circular structure, ensuring that the material does not undergo uncontrollable deformation during the bending process and enhancing the durability of the material. This geometric design can effectively extend the service life of the sheet-shaped substrate 1 and enable it to maintain a shape recovery rate of more than 95% after multiple bends.

[0065] There are residual stresses inside the connecting arm, which can make the strain energy E inside it have two minimum values. For example, if the curling radius of the axis of the connecting arm is r, then the curvature κ in the axis direction is 1 / r. When the connecting arm switches from the flattened state to the bent state, the radius r changes from infinity to r2, and the curvature κ changes from 0 to κ2. As Figure 7 shown, the strain energy E inside the connecting arm first increases with the increase of κ and then rapidly decreases to the minimum value E2. The straight and curled states of the connecting arm correspond to the two minimum values A and C of the energy E, both of which are stable states. Therefore, the connecting arm has a bistable structure. When the connecting arm changes from straight to bent, it has to pass through an energy peak B, called the energy barrier. Under the action of an external force, the connecting arm crosses the energy barrier point B. Since the BC section slopes steeply downwards, the connecting arm quickly releases the strain energy and deforms and curls rapidly. When the deformation is restricted, for example, when the auricle size is large and the curvature cannot be greater than κm, at this time, the energy of the connecting arm remains at point D, so that the in-ear Bluetooth headset can be firmly clamped on the auricle, reducing the risk of dropping. Secondly, it can fit different auricle shapes, thus improving the wearing comfort.

[0066] Preferably, the diameter of the circular structure of the sheet-shaped substrate 1 is 0.12 mm to 0.15 mm. This design takes into account both the requirements of light weight and strength, not only reducing the material weight but also ensuring that the sheet-shaped substrate 1 has sufficient rigidity to withstand external loads.

[0067] It is worth mentioning that if the connecting arm is too large, it is easy to cause the overall volume of the headset to be bulky, increasing the pressure on the ears and causing discomfort especially during long-term wearing. Therefore, for the sheet-shaped substrate 1 provided in this Embodiment 1, its width is between 8 mm and 12 mm. This design makes the connecting arm thin and light, reducing the sense of oppression on the ears and significantly improving the comfort of users when wearing the in-ear Bluetooth headset.

[0068] The inner diameter of the circular structure is 18 mm to 28 mm. Specifically, the sheet-shaped substrate 1 is formed by cutting from the complete circular structure 2 through laser cutting or precision stamping processes. When the sheet-shaped substrate 1 is in a bent state, the inner arc surface diameter R2 of the sheet-shaped substrate is equal to the inner diameter of the circular structure.

[0069] When the ear-hook type Bluetooth headset is not needed, the connecting arm can be switched from the bent state to the flattened state. Since the elastic material can change its shape as needed, the ear-hook type Bluetooth headset can be unfolded into a relatively flat form.

[0070] Embodiment 2

[0071] An elastic material applied to a Bluetooth device provided in this Embodiment 2 is applied to a smart ring. The smart ring includes a ring body, and the ring body includes a flexible housing, an elastic material, and a flexible control board. The elastic material and the flexible control board are both disposed within the flexible housing. The ring body switches between a curled state and a flattened state through deformation, and when there is no external force acting or the applied external force is less than the critical deformation force, the ring body remains in the current state. That is, when the ring body is in the curled state, when there is no external force acting or the applied external force is less than the critical deformation force, it can always maintain the curled state. When the ring body is in the flattened state, when there is no external force acting or the applied external force is less than the critical deformation force, it can always maintain the flattened state.

[0072] When the ring body is in the curled state, a wearing cavity adapted to the finger is formed by surrounding the ring body. The inner diameter of the wearing cavity is adjusted by bending the ring body to clamp and fix the finger. With such a design, the smart ring adjusts the curvature by bending to change the inner diameter of the wearing cavity, can dynamically adapt to the change of the finger, ensures that the smart ring always fits closely with the finger, avoids discomfort or ring detachment caused by size mismatch, and greatly improves the wearing comfort. When the ring is in the flattened state, its shape is flat, which is convenient for storage and charging.

[0073] Since a too narrow sheet-like base material 1 will result in insufficient contact area between the ring and the finger, which is likely to increase the local pressure and cause discomfort during wearing; while a too wide sheet-like base material 1 is likely to cause the ring to be mismatched with the finger, resulting in the edge of the ring pressing on the finger and thus affecting the comfort. Therefore, the width W1 of the sheet-like base material provided in Embodiment 2 of this application is 8 mm to 10 mm.

[0074] Preferably, the sheet-like base material 1 is formed by cutting from a complete circular structure 2 through laser cutting or precision stamping processes. When the sheet-like base material 1 is in the bent state, the inner arc surface diameter R2 of the sheet-like base material is equal to the inner diameter of the circular structure, where the inner diameter of the circular structure is 21 mm to 24 mm.

[0075] It should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0076] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

[0077] The above has made an exemplary description of the present invention patent in conjunction with the drawings. Obviously, the implementation of the present invention patent is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention patent, or the concept and technical solution of the present invention patent are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An elastic material applied to a Bluetooth device, characterized in that, Comprising: A sheet-shaped substrate that switches between a flattened state and a bent state through deformation. The cross-section of the sheet-shaped substrate in the flattened state is an arc-shaped surface, and the radian diameter of the arc-shaped surface is 15 mm to 25 mm, so that it has residual stress inside to maintain the flattened state; Wherein, the sheet-shaped substrate is formed by cutting from a complete circular structure. When the sheet-shaped substrate is in the bent state, the inner arc surface diameter of the sheet-shaped substrate is equal to the inner diameter of the circular structure.

2. The elastic material applied to a Bluetooth device according to claim 1, characterized in that: The sheet-shaped substrate is selected from any one of spring steel or carbon steel.

3. The elastic material applied to a Bluetooth device according to claim 1, wherein: The diameter of the circular structure of the sheet-shaped substrate is 0.12 mm to 0.15 mm.

4. The elastic material applied to a Bluetooth device according to claim 1, characterized in that: The width of the sheet-shaped substrate is 8 mm to 12 mm.

5. The elastic material applied to a Bluetooth device according to claim 4, wherein: The inner diameter of the circular structure is 18 mm to 28 mm.

6. The elastic material applied to a Bluetooth device according to claim 1, wherein: The width of the sheet-shaped substrate is 8 mm to 10 mm.

7. The elastic material applied to a Bluetooth device according to claim 6, wherein: The inner diameter of the circular structure is 21 mm to 24 mm.

8. The elastic material applied to a Bluetooth device according to claim 6, wherein: The sheet-shaped substrate is formed by cutting from the complete circular structure through laser cutting or precision stamping process.

9. A Bluetooth device, characterized in that, Comprising the elastic material according to any one of claims 1 to 8.

10. A storage box for a Bluetooth device, comprising a box body, wherein a receiving groove is provided in the box body, and it is characterized in that, The accommodation groove is used to place the Bluetooth device according to claim 9.

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