Composition for body contact component of wearable device and body contact component of wearable device using same and method for manufacturing same

Abstract

Various embodiments of the present disclosure relate to a composition for a body contact component of a wearable device, a body contact component of a wearable device, manufactured using same, and a method for manufacturing same. According to embodiments of the present disclosure, the composition for a body contact component of a wearable device comprises: hydrogenated nitrile butadiene rubber (HNBR); and a high-specific-gravity inorganic additive, and may have a specific gravity of 1.5-2.0. The body contact component of a wearable device, according to various embodiments of the present disclosure, may comprise HNBR and a high-specific-gravity inorganic additive and may have a specific gravity of 1.5-2.0.

Description

Composition for a human body contact part of a wearable device, a human body contact part of a wearable device using the same, and a manufacturing method thereof

[0001] The present disclosure relates to a composition for a human body contact part of a wearable device according to various embodiments of the present disclosure, a human body contact part of a wearable device manufactured using the same, and a method for manufacturing the same.

[0002] The use of wearable electronic devices is on the rise. For example, the strap of a smartwatch, a representative wearable electronic device, is the part that comes into direct contact with the wrist. For this part, fluoroelastomers (FKM) are primarily used, boasting excellent chemical resistance, heat resistance, and mechanical properties. Fluoroelastomers have a high specific gravity of approximately 1.9, resulting in excellent wrapability and comfort.

[0003] Although fluoroelastomers have these superior properties, they are made up of strong bonds between carbon and fluorine in per- and polyfluoralky substances (PFAS), making them difficult to naturally combust, corrode, or decompose. In particular, they are known to cause liver damage, kidney cancer, and thyroid disease when accumulated in the human body.

[0004] According to embodiments of the present disclosure, a composition for a human body contact part of a wearable device may include hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive, and may be for a human body contact part of a wearable device having a specific gravity value of 1.5 to 2.0.

[0005] According to embodiments of the present disclosure, a composition for a human body contact part of a wearable device includes, based on 100 parts by weight of the composition, 60 to 70 parts by weight of hydrogenated nitrile butadiene rubber (HNBR); and 30 to 40 parts by weight of barium sulfate, wherein the hydrogenated nitrile butadiene rubber (HNBR) has an acrylonitrile content of 35% to 45% and a residual double bond of 1.8% to 2.0%, and the composition may have a specific gravity of 1.5 to 1.7.

[0006] According to embodiments of the present disclosure, a human body contact part of a wearable device may include hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive; and may have a specific gravity value of 1.5 to 2.0.

[0007] According to embodiments of the present disclosure, a strap of a wearable device includes hydrogenated nitrile butadiene rubber (HNBR); barium sulfate; and a silicone coating layer formed on the outermost surface; wherein, based on 100 parts by weight of the strap, the hydrogenated nitrile butadiene rubber (HNBR) is in an amount of 60 parts by weight to 70 parts by weight; The barium sulfate may be 30 to 40 parts by weight, the hydrogenated nitrile butadiene rubber (HNBR) may have an acrylonitrile content of 35 to 45% and a residual double bond of 1.8 to 2.0%, the strap may have a specific gravity of 1.5 to 1.7, a tensile strength of 10 to 20 MPa and a Showa hardness of 60 to 75, and the coating layer may be a transparent layer having a thickness of 10 to 30 μm, a heat resistance of 100° C. or higher and a surface roughness of 20 μm or lower.

[0008] According to embodiments of the present disclosure, a method for manufacturing a human body contact part of a wearable device may include: preparing a composition by mixing hydrogenated nitrile butadiene rubber and a high-density inorganic additive; extrusion-molding the composition to produce a sheet; compression-molding the sheet; cutting the compression-molded sheet to produce a molded product; forming a coating layer on a surface of the molded product; and drying the molded product on which the coating layer is formed.

[0009] FIG. 1 illustrates an electronic device within a network environment according to embodiments.

[0010] Figures 2a and 2b are perspective views of electronic devices according to embodiments.

[0011] Figure 3 is an exploded perspective view of an electronic device according to embodiments.

[0012] FIG. 4 is a schematic image of a smart watch strap as an example of a human body contact component of a wearable device according to embodiments.

[0013] FIG. 5 is an image of a smartwatch being worn, including a smartwatch strap as an example of a human body contact part of a wearable device according to embodiments.

[0014] FIG. 6 is an enlarged image of a portion of a head mount that contacts the head as another example of a human body contact component of a wearable device according to embodiments.

[0015] FIG. 7 is a schematic image showing a method for manufacturing a smart watch strap as an example of a human body contact part of a wearable device according to embodiments.

[0016] Hereinafter, embodiments will be described in detail with reference to the attached drawings. In the description with reference to the attached drawings, identical components are assigned the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted.

[0017] The various embodiments and terminology used herein are not intended to limit the technical features described in the present disclosure to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In the present disclosure, each of the phrases "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among the phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0018] The term "module" used in various embodiments may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0019] Various embodiments may be implemented as software (e.g., a program (140)) including one or more instructions stored in a storage medium (e.g., internal memory (136) or external memory (138)) readable by a machine (e.g., an electronic device). For example, a processor of the machine (e.g., an electronic device) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0020] According to one embodiment, the method according to the various embodiments disclosed in the present disclosure may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0021] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0022] FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to embodiments.

[0023] Referring to FIG. 1, in a network environment (100), an electronic device (101) may communicate with an electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with an electronic device (104) or a server (108) via a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), a haptic module (179), a camera module (180), a power management module (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In some embodiments, the electronic device (101) may omit at least one of these components (e.g., the connection terminal (178)), or may have one or more other components added. In some embodiments, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0024] The processor (120) may control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) by executing, for example, software (e.g., a program (140)), and may perform various data processing or calculations. According to one embodiment, as at least a part of the data processing or calculation, the processor (120) may store a command or data received from another component (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the command or data stored in the volatile memory (132), and store the resulting data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor) or a secondary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together therewith. For example, if the electronic device (101) includes a main processor (121) and a secondary processor (123), the secondary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a specified function. The secondary processor (123) may be implemented separately from the main processor (121) or as a part thereof.

[0025] The auxiliary processor (123) may control at least a part of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing an artificial intelligence model. The artificial intelligence model may be generated through machine learning. This learning can be performed, for example, in the electronic device (101) itself where artificial intelligence is performed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0026] The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or non-volatile memory (134).

[0027] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0028] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0029] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. According to one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0030] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. According to one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0031] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0032] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0033] The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) with an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0034] The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0035] A haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0036] The camera module (180) can capture still images and videos. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0037] The power management module (188) can manage power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0038] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0039] The communication module (190) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device (104) via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0040] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) may support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0041] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). According to one embodiment, the antenna module (197) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). According to one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the selected at least one antenna. According to some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0042] According to embodiments, the antenna module (197) may form a mmWave antenna module. According to one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0043] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0044] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the external electronic devices (102 or 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of or in addition to executing the function or service by itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0045] Electronic devices according to the various embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments disclosed in this document are not limited to the aforementioned devices.

[0046] Referring to FIGS. 2A and 2B, an electronic device (200) according to one embodiment (e.g., the electronic device (101) of FIG. 1) may include a housing (210) including a first side (or front side) (210A), a second side (or back side) (210B), and a side surface (210C) surrounding a space between the first side (210A) and the second side (210B), and a fastening member (250, 260) connected to at least a portion of the housing (210) and configured to releasably fasten the electronic device (200) to a part of a user's body (e.g., a wrist, an ankle, etc.). In another embodiment (not shown), the housing may also refer to a structure forming a portion of the first side (210A), the second side (210B), and the side surface (210C) of FIG. 2A. In one embodiment, the first side (210A) may be formed by a front plate (201) that is at least partially substantially transparent (e.g., a glass plate or a polymer plate comprising various coating layers). The second side (210B) may be formed by a substantially opaque back plate (207). The back plate (207) may be formed of, for example, coated or colored glass, ceramic, polymer, metal (e.g., aluminum, stainless steel (STS), or magnesium), or a combination of at least two of the foregoing materials. The side surface (210C) may be formed by a side bezel structure (or “side member”) (206) that is coupled to the front plate (201) and the back plate (207) and comprises a metal and / or a polymer. In some embodiments, the back plate (207) and the side bezel structure (206) may be formed integrally and comprise the same material (e.g., a metal material such as aluminum). The above-mentioned fastening member (250, 260) may be formed of various materials and shapes. The integral and multiple unit links may be formed to be mutually movable by a combination of at least two of the above-mentioned materials, such as woven fabric, leather, rubber, urethane, metal, ceramic, or a combination of the above-mentioned materials.

[0047] According to one embodiment, the electronic device (200) may include at least one of a display (220, see FIG. 3), an audio module (205, 208), a sensor module (211), a key input device (202, 203, 204), and a connector hole (209). In some embodiments, the electronic device (200) may omit at least one of the components (e.g., the key input device (202, 203, 204), the connector hole (209), or the sensor module (211)) or may additionally include other components.

[0048] The display (220) may be exposed, for example, through a significant portion of the front plate (201). The shape of the display (220) may correspond to the shape of the front plate (201), and may be in various shapes such as circular, oval, or polygonal. The display (220) may be combined with or disposed adjacent to a touch detection circuit, a pressure sensor capable of measuring the intensity (pressure) of a touch, and / or a fingerprint sensor.

[0049] The audio module (205, 208) may include a microphone hole (205) and a speaker hole (208). The microphone hole (205) may have a microphone positioned therein for acquiring external sounds, and in some embodiments, multiple microphones may be positioned therein to detect the direction of sounds. The speaker hole (208) may be used as an external speaker and a receiver for calls. In some embodiments, the speaker hole (208) and the microphone hole (205) may be implemented as a single hole, or a speaker may be included without the speaker hole (208) (e.g., a piezo speaker).

[0050] The sensor module (211) can generate an electric signal or data value corresponding to an internal operating state of the electronic device (200) or an external environmental state. The sensor module (211) can include, for example, a biometric sensor module (211) (e.g., an HRM sensor) disposed on the second surface (210B) of the housing (210). The electronic device (200) can further include at least one of a sensor module not shown, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0051] The sensor module (211) may include electrode areas (213, 214) forming a portion of the surface of the electronic device (200) and a biosignal detection circuit (not shown) electrically connected to the electrode areas (213, 214). For example, the electrode areas (213, 214) may include a first electrode area (213) and a second electrode area (214) arranged on a second surface (210B) of the housing (210). The sensor module (211) may be configured such that the electrode areas (213, 214) obtain an electrical signal from a portion of the user's body, and the biosignal detection circuit detects the user's bioinformation based on the electrical signal.

[0052] The key input devices (202, 203, 204) may include a wheel key (202) disposed on a first side (210A) of the housing (210) and rotatable in at least one direction, and / or a side key button (203, 204) disposed on a side surface (210C) of the housing (210). The wheel key may have a shape corresponding to the shape of the front plate (201). In other embodiments, the electronic device (200) may not include some or all of the above-mentioned key input devices (202, 203, 204), and the key input devices (202, 203, 204) that are not included may be implemented in another form, such as a soft key, on the display (220). The connector hole (209) may include another connector hole (not shown) that may accommodate a connector (e.g., a USB connector) for transmitting and receiving power and / or data with an external electronic device, and may accommodate a connector for transmitting and receiving audio signals with the external electronic device. The electronic device (200) may further include, for example, a connector cover (not shown) that covers at least a portion of the connector hole (209) and blocks the inflow of external foreign substances into the connector hole.

[0053] The fastening member (250, 260) can be detachably fastened to at least a portion of the housing (210) using a locking member (251, 261). The fastening member (250, 260) can include one or more of a fixing member (252), a fixing member fastening hole (253), a band guide member (254), and a band fastening ring (255).

[0054] The fixing member (252) can be configured to fix the housing (210) and the fastening members (250, 260) to a part of the user's body (e.g., wrist, ankle, etc.). The fastening member fastening hole (253) can fix the housing (210) and the fastening members (250, 260) to a part of the user's body in response to the fastening member (252). The band guide member (254) is configured to limit the range of movement of the fastening member (252) when the fastening member (252) is fastened to the fastening member fastening hole (253), thereby allowing the fastening members (250, 260) to be fastened in close contact with a part of the user's body. The band fixing ring (255) can limit the range of movement of the fastening members (250, 260) when the fastening member (252) and the fastening member fastening hole (253) are fastened.

[0055]

[0056] Referring to FIG. 3, an electronic device (300) (e.g., the electronic device (101) of FIG. 1 or the electronic device (200) of FIG. 2) may include a side bezel structure (310), a wheel key (320), a front plate (201), a display (220), a first antenna (350), a second antenna (355), a support member (360) (e.g., a bracket), a battery (370), a printed circuit board (380), a sealing member (390), a rear plate (393), and fastening members (395, 397). At least one of the components of the electronic device (300) may be the same as or similar to at least one of the components of the electronic device (200) of FIG. 1 or FIG. 2, and a redundant description thereof will be omitted below. The support member (360) may be disposed inside the electronic device (300) and connected to the side bezel structure (310), or may be formed integrally with the side bezel structure (310). The support member (360) may be formed of, for example, a metallic material and / or a non-metallic (e.g., polymer) material. The support member (360) may have a display (220) coupled to one surface and a printed circuit board (380) coupled to the other surface. A processor, a memory, and / or an interface may be mounted on the printed circuit board (380). The processor may include, for example, one or more of a central processing unit, an application processor, a graphic processing unit (GPU), an application processor sensor processor, or a communication processor.

[0057] The memory may include, for example, volatile memory or non-volatile memory. The interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and / or an audio interface. The interface may electrically or physically connect the electronic device (300) to an external electronic device, for example, and may include a USB connector, an SD card / MMC connector, or an audio connector.

[0058] The battery (370) is a device for supplying power to at least one component of the electronic device (300), and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. At least a portion of the battery (370) may be disposed substantially on the same plane as, for example, the printed circuit board (380). The battery (370) may be disposed integrally within the electronic device (200), or may be disposed detachably from the electronic device (200).

[0059] The first antenna (350) may be positioned between the display (220) and the support member (360). The first antenna (350) may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and / or a magnetic secure transmission (MST) antenna. The first antenna (350) may, for example, perform short-range communication with an external device, wirelessly transmit and receive power required for charging, and transmit a magnetic-based signal including a short-range communication signal or payment data. In another embodiment, the antenna structure may be formed by a portion or a combination of the side bezel structure (310) and / or the support member (360).

[0060] The second antenna (355) may be disposed between the printed circuit board (380) and the back plate (393). The second antenna (355) may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and / or a magnetic secure transmission (MST) antenna. The second antenna (355) may, for example, perform short-range communication with an external device, wirelessly transmit and receive power required for charging, and transmit a magnetic-based signal including a short-range communication signal or payment data. In another embodiment, the antenna structure may be formed by a portion or a combination of the side bezel structure (310) and / or the back plate (393).

[0061] A sealing member (390) may be positioned between the side bezel structure (310) and the rear plate (393). The sealing member (390) may be configured to block moisture and foreign substances from entering the space surrounded by the side bezel structure (310) and the rear plate (393) from the outside.

[0062]

[0063] A composition for a human body contact part of a wearable device according to one embodiment comprises hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive; and may be for a human body contact part of a wearable device having a specific gravity value of 1.5 to 2.0.

[0064] Fluorine rubber is widely used as a body-contacting component of wearable devices, but fluoroelastomer is a per- and polyfluoralky substance (PFAS), and the strong bond between carbon and fluorine does not decompose in the natural environment, making it an environmentally hazardous substance. Furthermore, considering that it comes into direct contact with the human body, it is known to cause various diseases if exposed to it for a long time. From this perspective, there is a technological and industrial need for a component for the body-contacting component of wearable devices that can replace it.

[0065] In addition, the fluoroelastomer currently in use has a specific gravity of approximately 1.9, and considering the comfort of wearing it as a body-contacting component of a wearable device, for example, the wrap-around property when used on the wrist, an alternative component with a specific gravity value equivalent to this is required.

[0066] A composition for a human body contact part of a wearable device according to one embodiment of the present disclosure comprises hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive. As a basic component, the composition comprises hydrogenated nitrile butadiene rubber (HNBR). HNBR is formed by hydrogenating NBR (nitrile rubber), and is harmless to the human body and environmentally friendly, thereby meeting the aforementioned technical and industrial needs.

[0067] However, as described above, when the human body contact part of the wearable device is used in a form that is wrapped or fixed to the wrist or head, it must have a specific gravity value above a certain level. However, the specific gravity of hydrogenated nitrile butadiene rubber (HNBR) is only about 0.95. Therefore, in order to increase the specific gravity, the composition for the human body contact part of the wearable device of the present disclosure includes a high-specific gravity inorganic additive. By adding the high-specific gravity inorganic additive, the composition for the human body contact part of the wearable device of the present disclosure has a specific gravity value of 1.5 to 2.0.

[0068] From the perspective of human safety and eco-friendliness, EPDM (ethylene-proplene-diene rubber, a terpolymer of ethylene, propylene, and diene) and silicone can be considered as applicable components, but they must contain high-density inorganic additives to have a specific gravity value above a certain level, and high-density inorganic additives weaken the bonding force between elastomers, thereby lowering the tensile strength. In addition to hydrogenated nitrile butadiene rubber (HNBR), EPDM and silicone have low tensile strengths (EPDM about 14 MPa, silicone about 7 MPa), so if they contain high-density inorganic additives above a certain level, the overall physical properties, including the tensile strength, will fall below the required level.

[0069] That is, the hydrogenated nitrile butadiene rubber (HNBR) of the present disclosure is not only harmless to the human body and environmentally friendly in itself, but also has excellent tensile strength characteristics (about 25 MPa), and is therefore suitable for addition of high-density inorganic additives, and can be adopted as a material of the present disclosure.

[0070] In a composition for a human body contact part of a wearable device according to one embodiment, the hydrogenated nitrile butadiene rubber may have an acrylonitrile content of 20 to 50 parts by weight based on 100 parts by weight of the hydrogenated nitrile butadiene rubber.

[0071] The acrylonitrile content in hydrogenated nitrile butadiene rubber is a major factor in determining the low-temperature properties of the hydrogenated nitrile butadiene rubber. The higher the acrylonitrile content in the hydrogenated nitrile butadiene rubber, the higher the glass transition temperature. Considering the usage conditions of the human body contact parts of wearable devices, the glass transition temperature value is required to be about 20 degrees or lower, and therefore the acrylonitrile content in the hydrogenated nitrile butadiene rubber may be 20 to 50 parts by weight based on 100 parts by weight of the hydrogenated nitrile butadiene rubber.

[0072] Based on 100 parts by weight of hydrogenated nitrile butadiene rubber, if the acrylonitrile content is lower than 20 parts by weight, chemical resistance may be reduced, and if the acrylonitrile content is higher than 50 parts by weight, the glass transition temperature may be increased, resulting in deterioration of low-temperature characteristics.

[0073] The acrylonitrile content in the hydrogenated nitrile butadiene rubber may be 25 parts by weight to 50 parts by weight, 30 parts by weight to 50 parts by weight, 40 parts by weight to 50 parts by weight, 45 parts by weight to 50 parts by weight, 20 parts by weight to 45 parts by weight, 20 parts by weight to 40 parts by weight, 20 parts by weight to 35 parts by weight, 20 parts by weight to 30 parts by weight, 20 parts by weight to 25 parts by weight, 25 parts by weight to 45 parts by weight, 30 parts by weight to 40 parts by weight, or 34 parts by weight to 36 parts by weight, based on 100 parts by weight of the hydrogenated nitrile butadiene rubber.

[0074]

[0075] In a composition for a human body contact part of a wearable device according to one embodiment, the hydrogenated nitrile butadiene rubber may have a double bond content of 0.9% to 2.0%.

[0076] Hydrogenated nitrile butadiene rubber, or HNBR, is a synthetic polymer made by saturating the carbon-carbon double bonds of nitrile rubber (NBR) with hydrogen. Therefore, it has residual double bonds that have not yet been hydrogenated. The content (quantity) of these residual double bonds determines its acid and heat resistance properties.

[0077] Considering the usage environment of the human body contact parts of wearable devices, they are required to have strong resistance to air (oxygen) and sweat (moisture, acid) because they may be in contact with the human body for long periods of time and exposed to the outside.

[0078] The content of double bonds in the hydrogenated nitrile butadiene rubber of the composition for a body-contacting component of a wearable device affects the elongation change rate of the body-contacting component of the wearable device manufactured using the composition for the body-contacting component of the wearable device. As the double bond content of the hydrogenated nitrile butadiene rubber of the composition for a body-contacting component of the wearable device decreases, the elongation change rate of the body-contacting component of the wearable device manufactured using the composition for the body-contacting component of the wearable device tends to decrease. Therefore, it is required that the double bond content be maintained below a certain level. In addition, the double bond content affects the deviation of the color difference value of the component. As the double bond content decreases, the deviation of the color difference value tends to decrease. This can be confirmed through an artificial sweat limit test, that is, an experiment in which changes in the color difference value are measured after exposure to artificial sweat having a salt content and acidity similar to those of actual sweat, including lactic acid (pH approximately 2).

[0079] Considering the actual usage environment of the human body contact part of a wearable device exposed to sweat, the content of double bonds in the hydrogenated nitrile butadiene rubber of the composition for the human body contact part of a wearable device may be 2.0% or less. Although the content of double bonds in the hydrogenated nitrile butadiene rubber of the composition for the human body contact part of a wearable device does not have a technical lower limit, it may be 0.9% or more in consideration of preventing overreaction and productivity during the actual hydrogenation process.

[0080] The double bond content of the above hydrogenated nitrile butadiene rubber may be 0.9% to 1.7%, 0.9% to 1.5%, 0.9% to 1.3%, 0.9% to 1.1%, 1.1% to 2.0%, 1.3% to 2.0%, 1.5% to 2.0%, 1.7% to 2.0%, 1.1% to 1.7%, or 1.3% to 1.5%.

[0081]

[0082] In a composition for a human body contact part of a wearable device according to one embodiment, the hydrogenated nitrile butadiene rubber may be present in an amount of 30 to 70 parts by weight based on 100 parts by weight of the composition.

[0083] According to one embodiment, the composition for a human body contact part of a wearable device may include, in addition to the hydrogenated nitrile butadiene rubber, a high-density inorganic additive as a gravity adjuster, an acid-resistant additive for improving acid resistance, and a light stabilizer as an additive for improving light stability. Therefore, in the composition for a human body contact part of a wearable device according to one embodiment, the hydrogenated nitrile butadiene rubber may be in an amount of 30 to 70 parts by weight based on 100 parts by weight of the composition.

[0084] In a composition for a human body contact part of a wearable device according to one embodiment, the hydrogenated nitrile butadiene rubber is a component that determines the basic properties of the human body contact part of the wearable device, and therefore may be 30 parts by weight or more, and taking into account the content of the high-density inorganic additive that is necessarily added and other additives that may be optionally and selectively added, may be 70 parts by weight or less. If the content of the hydrogenated nitrile butadiene rubber is lower than 30 parts by weight, the content of the high-density inorganic additive may relatively increase, thereby lowering the bonding force between molecules, and if the content of the hydrogenated nitrile butadiene rubber is higher than 70 parts by weight, the content of the high-density inorganic additive may relatively decrease, thereby failing to have a target specific gravity value.

[0085] In the composition for a human body contact part of the wearable device, the hydrogenated nitrile butadiene rubber may be present in an amount of 30 parts by weight to 65 parts by weight, 30 parts by weight to 60 parts by weight, 30 parts by weight to 55 parts by weight, 30 parts by weight to 50 parts by weight, 30 parts by weight to 45 parts by weight, 35 parts by weight to 70 parts by weight, 40 parts by weight to 70 parts by weight, 45 parts by weight to 70 parts by weight, 50 parts by weight to 70 parts by weight, 55 parts by weight to 70 parts by weight, 60 parts by weight to 70 parts by weight, 35 parts by weight to 65 parts by weight, 40 parts by weight to 60 parts by weight, 45 parts by weight to 55 parts by weight, or 48 parts by weight to 52 parts by weight, based on 100 parts by weight of the composition.

[0086]

[0087] In a composition for a human body contact part of a wearable device according to one embodiment, the high-density inorganic additive may include at least one selected from the group consisting of titanium dioxide, silicon dioxide, zinc oxide, barium sulfate, and lithopone.

[0088] As described above, hydrogenated nitrile butadiene rubber has various advantages for use as a body-contacting component of a wearable device, but since it has a lower specific gravity than fluoroelastomer, it needs to be supplemented in terms of wearing comfort as a body-contacting component of a wearable device, for example, in terms of wrapability when used on the wrist. Accordingly, a composition for a body-contacting component of a wearable device according to one embodiment may include a high-specific gravity inorganic additive, and the high-specific gravity inorganic additive may include at least one selected from the group consisting of titanium dioxide, silicon dioxide, zinc oxide, barium sulfate, and lithopone.

[0089] The body-contacting components of wearable devices come into direct contact with the human body, and due to the nature of their use, the skin is exposed to these components for extended periods of time. Therefore, environmental and human safety are required. For example, barium sulfate has a high specific gravity of 4.5 and has been proven to be environmentally and human-safe to the extent that it can be used as a gastrointestinal contrast agent. Therefore, it can be used as an additive in the composition for the body-contacting components of the wearable device of the present disclosure.

[0090]

[0091] In a composition for a human body contact part of a wearable device according to one embodiment, the high specific gravity inorganic additive may be in an amount of 25 to 50 parts by weight based on 100 parts by weight of the composition.

[0092] In the composition for a human body-contacting part of a wearable device, if the content of the high-density inorganic additive is small, the effect of improving the specific gravity of the entire composition for a human body-contacting part of a wearable device may be insufficient, and if the content of the high-density inorganic additive is large, the bonding force between molecules may be reduced, so that the mechanical properties (for example, tensile strength) of the human body-contacting part of a wearable device manufactured using the composition for a human body-contacting part of a wearable device may be reduced, and intermolecular voids may be formed, thereby reducing acid resistance and durability. Therefore, in the composition for a human body-contacting part of a wearable device according to one embodiment of the present disclosure, the high-density inorganic additive may be 25 parts by weight to 50 parts by weight based on 100 parts by weight of the composition. It was confirmed through experiments that as the content of barium sulfate as a high-density inorganic additive in the composition for a human body-contacting part of a wearable device increases, dimensional changes and weight changes due to artificial sweat increase (deterioration of chemical resistance and stability). As the content of barium sulfate as a high-density inorganic additive in a composition for a human-contact part of a wearable device increases, it was confirmed through experiments that the tensile strength of a human-contact part of a wearable device manufactured with the composition for a human-contact part of a wearable device also decreases, as shown in the table below.

[0093] In the composition for a human body contact part of a wearable device of the present disclosure, if the content of the high-density inorganic additive is lower than 25 parts by weight based on 100 parts by weight of the composition, the target specific gravity required for the human body contact part of the wearable device may not be achieved, and if the content of the high-density inorganic additive is higher than 50 parts by weight, the content of hydrogenated nitrile butadiene rubber is relatively low, so that the bonding force between molecules is lowered, and thus the physical properties of the human body contact part of the wearable device may deteriorate.

[0094] In the composition for the human body contact part of the wearable device, the content of the high specific gravity inorganic additive may be 25 parts by weight to 45 parts by weight, 25 parts by weight to 40 parts by weight, 25 parts by weight to 35 parts by weight, 25 parts by weight to 30 parts by weight, 30 parts by weight to 50 parts by weight, 35 parts by weight to 50 parts by weight, 40 parts by weight to 50 parts by weight, 45 parts by weight to 50 parts by weight, 30 parts by weight to 45 parts by weight, or 35 parts by weight to 40 parts by weight, based on 100 parts by weight of the composition.

[0095]

[0096] In a composition for a human body contact part of a wearable device according to one embodiment, the composition may be per- / poly fluoroalkyl substances-free (PFAS-Free).

[0097] Fluorine rubber, which is used as a material for body-contacting parts of wearable devices due to its excellent properties such as high specific gravity, good physical properties, and wearing comfort, is a perfluorinated compound, which is difficult to decompose naturally and has the potential to cause liver damage, kidney cancer, and thyroid disease due to accumulation in the human body when exposed to the human body for a long time. Therefore, there is a need to replace it. Therefore, a composition for a body-contacting part of a wearable device according to an embodiment of the present disclosure may not contain a perfluorinated compound.

[0098]

[0099] According to one embodiment, a composition for a human-contact component of a wearable device may include, as other additives, an acid-resistant additive, a light stabilizer, or both. Considering the usage conditions of the human-contact component of the wearable device, there is a possibility of discoloration due to acidic sweat (pH 5 to 6), and to prevent or reduce this, a phenolic antioxidant that removes hydroxyl radicals to prevent oxidation and has excellent high-temperature stability may be included as an acid-resistant additive. The antioxidant may be a phenolic antioxidant that removes hydroxyl radicals to prevent oxidation and has excellent high-temperature stability. As an example, the phenolic antioxidant may include at least one selected from the group consisting of butylated hydroxytoluene (BHT: CAS No. 128-37-0), butylated hydroxyanisole (BHA, butylated hydroxyanisole), and tertiary butylhydroquinone (TBHQ, tertiary butylhydroquinone).

[0100]

[0101] A composition for a body-contacting component of a wearable device according to one embodiment may include a light stabilizer to prevent or reduce discoloration due to exposure to an external environment. A UV absorber may be included to prevent discoloration caused by various additives added during the molding process for a body-contacting component of a wearable device. The UV absorber selectively absorbs ultraviolet rays from sunlight and converts them into heat energy or extinguishes free radicals generated by decomposition from ultraviolet rays, thereby preventing or reducing aging and decomposition of the body-contacting component of the wearable device due to ultraviolet rays. The UV absorber may be, for example, benzophenone, benzotriazole, or salicylate, and may absorb ultraviolet rays with a wavelength of 270 nm to 380 nm.

[0102]

[0103] According to one embodiment of the present disclosure, a composition for a human body contact part of a wearable device includes, based on 100 parts by weight of the composition, 60 to 70 parts by weight of hydrogenated nitrile butadiene rubber (HNBR); and 30 to 40 parts by weight of barium sulfate, wherein the hydrogenated nitrile butadiene rubber (HNBR) has an acrylonitrile content of 35% to 45% and a residual double bond of 1.8% to 2.0%, and the composition may have a specific gravity of 1.5 to 1.7.

[0104]

[0105] FIG. 4 is a schematic image of a smartwatch strap (400) as an example of a body-contacting component of a wearable device according to embodiments. It is an example of a body-contacting component of a wearable device manufactured using the composition for a body-contacting component of a wearable device of the present disclosure. Considering the usage conditions, it can be naturally wrapped around the wrist due to a specific gravity above a certain level, and can be resistant to exposure to sweat due to long-term use and exposure to external environments such as sunlight. FIG. 4 illustrates a strap (band) (410) of a smartwatch as an example, but the back of the smartwatch body is also a part that directly contacts the human body, and thus can be a body-contacting component of the wearable device of the present disclosure. Furthermore, parts such as a ring (420) and a hinge (430) of the smartwatch strap can also be manufactured using the composition for a body-contacting component of a wearable device of the present disclosure.

[0106]

[0107] FIG. 5 is an image of a smartwatch being worn, including a smartwatch strap (500) as an example of a body-contacting component of a wearable device according to embodiments. FIG. 5 illustrates that, in wearing the smartwatch, a ring (buckle) connected to a first strap (510) is inserted into a hole of a second strap (520) to be worn, similar to the case of wearing a general wristwatch. However, this is merely an example, and the body-contacting component of the wearable device of the present disclosure includes all body-contacting components of the wearable device that are worn by various methods of combination.

[0108]

[0109] FIG. 6 is an enlarged image of a portion of a head mount that contacts the head as another example of a human body contact component of a wearable device according to embodiments. Depending on the type and shape of the head mount, the portion that contacts the skin of the head and the degree of contact vary greatly, and FIG. 6 is an enlarged image of a portion of the head mount that contacts the skin near the temple. The entire portion illustrated in FIG. 6 may correspond to the human body contact component of the wearable device of the present disclosure, or only a portion of the head mount illustrated in FIG. 6 that directly contacts the skin may be configured as the human body contact component of the wearable device of the present disclosure.

[0110]

[0111] A human body contact part of a wearable device according to one embodiment of the present disclosure may include hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive; and may have a specific gravity value of 1.5 to 2.0.

[0112] It means something manufactured through a molding process of a composition for a human body contact part of a wearable device according to an embodiment of the present disclosure, and is not limited to a specific shape or product, and the specific gravity value of 1.5 to 2.0 may be a specific gravity excluding metal parts such as rings and buckles that are combined and used in a human body contact part of a wearable device according to an embodiment of the present disclosure.

[0113] As an embodiment of the present disclosure, a human body contact component of a wearable device includes the physical properties of the composition for a human body contact component of a wearable device according to an embodiment of the present disclosure. Although it may have additional properties due to the formation of a coating layer described below, the properties of the human body contact component of the wearable device itself, such as specific gravity, acid resistance, harmlessness to the human body, and tensile strength, may be the same as those of the composition for a human body contact component of a wearable device according to an embodiment of the present disclosure.

[0114]

[0115] In a human body contact part of a wearable device according to one embodiment, the human body contact part of the wearable device may have a tensile strength of 10 MPa to 20 MPa. As described above, the tensile strength of the human body contact part of the wearable device is provided by the content of hydrogenated nitrile butadiene rubber and the content of residual double bonds in the hydrogenated nitrile butadiene rubber in the composition for the human body contact part of the wearable device.

[0116] The tensile strength of the human body contact part of the wearable device may be 12 MPa to 20 MPa, 14 MPa to 20 MPa, 16 MPa to 20 MPa, 18 MPa to 20 MPa, 10 MPa to 18 MPa, 10 MPa to 16 MPa, 10 MPa to 14 MPa, 10 MPa to 12 MPa, 12 MPa to 18 MPa, or 14 MPa to 16 MPa.

[0117]

[0118] In a human body contact component of a wearable device according to one embodiment of the present disclosure, the human body contact component of the wearable device may further include a coating layer having a surface roughness of 20 μm or less formed on a surface.

[0119] The above coating layer may serve to protect the body-contacting component of the wearable device from external stimuli or the environment, and may also provide a certain degree of surface roughness to prevent or reduce slipping. For example, due to the characteristics of hydrogenated nitrile butadiene rubber, for example, when wearing it, if there is sweat or moisture on the wrist or head, it may be difficult to wear it due to slipping, so it may be necessary to have a certain degree of surface roughness. Accordingly, the body-contacting component of the wearable device according to one embodiment of the present disclosure may include a coating layer having a surface roughness of 20 μm or less.

[0120]

[0121] In a human body contact part of a wearable device according to one embodiment, the coating layer may be a transparent layer comprising at least one selected from the group consisting of urethane, urethane acrylate, and silicone, having a thickness of 10 μm to 30 μm, and having a heat resistance of 100° C. or higher.

[0122] If the thickness of the coating layer is thinner than 10 ㎛, the coating layer itself may be vulnerable to damage, and if the thickness of the coating layer is thicker than 30 ㎛, the slipperiness and feel when worn may be reduced.

[0123] The thickness of the coating layer may be 15 µm to 30 µm, 20 µm to 30 µm, 25 µm to 30 µm, 10 µm to 25 µm, 10 µm to 20 µm, 10 µm to 15 µm, 15 µm to 25 µm or 18 µm to 22 µm.

[0124]

[0125] In a human body contact component of a wearable device according to one embodiment, the human body contact component of the wearable device may have a surface hardness of 60 Showa hardness to 100 Showa hardness. The surface hardness may be the surface hardness of a human body contact component of the wearable device that does not include a coating layer, or, when the coating layer is included, the surface hardness of the coating layer of the human body contact component of the wearable device.

[0126] Depending on the type of the human body contact part of the actual wearable device, the surface hardness may be different, and the surface hardness may be 65 Showa hardness to 100 Showa hardness, 70 Showa hardness to 100 Showa hardness, 75 Showa hardness to 100 Showa hardness, 80 Showa hardness to 100 Showa hardness, 85 Showa hardness to 100 Showa hardness, 90 Showa hardness to 100 Showa hardness, 95 Showa hardness to 100 Showa hardness, 60 Showa hardness to 95 Showa hardness, 60 Showa hardness to 90 Showa hardness, 60 Showa hardness to 85 Showa hardness, 60 Showa hardness to 80 Showa hardness, 60 Showa hardness to 75 Showa hardness, 60 Showa hardness to 70 Showa The hardness may be 65 Showa hardness to 95 Showa hardness, 70 Showa hardness to 90 Showa hardness, 75 Showa hardness to 85 Showa hardness, or 78 Showa hardness to 82 Showa hardness.

[0127]

[0128] In one embodiment, the body-contacting component of the wearable device may include at least one selected from the group consisting of a strap, a headset, a head mount, gloves, an earpiece, smart glasses, smart goggles, a body-attached sensor, an e-skin, and an attachable wearable patch. However, the body-contacting component of the wearable device of the present disclosure is not limited thereto, and includes all components of various devices that are used by contacting the human body regardless of the time and method of contact, or the contact area on the human body. In addition, the body-contacting component of the wearable device of the present disclosure may occupy almost the entirety of the wearable device, in addition to the case of small components coupled to the entire wearable device.

[0129]

[0130] According to one embodiment of the present disclosure, a strap of a wearable device comprises hydrogenated nitrile butadiene rubber (HNBR); barium sulfate; and a silicone coating layer formed on the outermost surface; wherein, based on 100 parts by weight of the strap, the hydrogenated nitrile butadiene rubber (HNBR) is present in an amount of 60 parts by weight to 70 parts by weight; The barium sulfate may be in an amount of 30 to 40 parts by weight, the hydrogenated nitrile butadiene rubber (HNBR) may have an acrylonitrile content of 35 to 45% and a residual double bond of 1.8 to 2.0%, the strap may have a specific gravity of 1.5 to 1.7, a tensile strength of 10 to 20 MPa and a Showa hardness of 60 to 75, and the coating layer may be a transparent layer having a thickness of 10 to 30 μm, a heat resistance of 100° C. or higher and a surface roughness of 20 μm or lower.

[0131]

[0132] FIG. 7 is a schematic image showing a method for manufacturing a smart watch strap as an example of a human body contact part of a wearable device according to embodiments.

[0133] A method for manufacturing a human body contact part of a wearable device according to one embodiment of the present disclosure may include: an operation (710) of manufacturing a composition by mixing hydrogenated nitrile butadiene rubber and a high-density inorganic additive; an operation (720) of manufacturing a sheet by extrusion molding the composition; an operation (730, 740) of compression molding the sheet; an operation (750) of manufacturing a molded product by cutting the compression molded sheet; an operation (760) of forming a coating layer on a surface of the molded product; and an operation (770) of drying the molded product on which the coating layer is formed.

[0134]

[0135] In one embodiment, the coating layer may be a transparent layer comprising a silicon-based material and having a thickness of 10 μm to 30 μm and having a heat resistance of 100° C. or higher.

[0136] Referring to FIG. 7, as an embodiment of the present disclosure, a process for manufacturing a human body contact part of a wearable device of the present disclosure using a composition for a human body contact part of a wearable device of the present disclosure will be described as follows. In the following, each operation will be described in sequence, but the sequence may be changed or performed simultaneously as needed.

[0137] A composition (722) was prepared (720) by mixing hydrogenated nitrile butadiene rubber (712) and a high-density inorganic additive (714). Based on 100 parts by weight of the composition, 65 parts by weight of hydrogenated nitrile butadiene rubber and 35 parts by weight of barium sulfate as a high-density inorganic additive were mixed. The hydrogenated nitrile butadiene rubber had an acrylonitrile content of 40 parts by weight and a residual double bond of 1.9% based on 100 parts by weight of the hydrogenated nitrile butadiene rubber.

[0138] In order to manufacture a smartwatch strap as a final molded product, butylated hydroxytoluene (BHT) as an antioxidant (716) and benzophenone as a light stabilizer were added, taking into account the properties (tensile strength, surface hardness) required for a smartwatch strap.

[0139] These were mixed and an extrusion molded sheet (732) (elastomer sheet) was manufactured through an extrusion process (730). This was cut, the cut extrusion molded sheet (742) was placed in a strap mold, compression molded (740), and unnecessary portions in the shape of the strap were cut off (750).

[0140] To provide the strap with the required surface roughness of 10 μm, a 20 μm coating layer was formed by spraying urethane acrylate (760). Considering the usage characteristics of the strap, a spray coating layer was formed on both sides. Thereafter, the final product, the strap, was manufactured through room temperature drying (770).

[0141] The specific gravity of the strap manufactured in this way was confirmed to be 1.7, the surface roughness of the coating layer was measured to be 10 ㎛, and it exhibited a Showa hardness of 66 and a tensile strength of 13 MPa.

[0142]

[0143] A composition for a human body contact part of a wearable device according to one embodiment comprises hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive; and may be for a human body contact part of a wearable device having a specific gravity value of 1.5 to 2.0.

[0144] In one embodiment, the hydrogenated nitrile butadiene rubber may have an acrylonitrile content of 20 parts by weight to 50 parts by weight based on 100 parts by weight of the hydrogenated nitrile butadiene rubber.

[0145] In one embodiment, the hydrogenated nitrile butadiene rubber may have a double bond content of 0.9% to 2.0%.

[0146] In one embodiment, the hydrogenated nitrile butadiene rubber may be present in an amount of 30 parts by weight to 70 parts by weight based on 100 parts by weight of the composition.

[0147] In one embodiment, the high-density inorganic additive may include at least one selected from the group consisting of titanium dioxide, silicon dioxide, zinc oxide, barium sulfate, and lithopone.

[0148] In one embodiment, the high-density inorganic additive may be present in an amount of 25 to 50 parts by weight based on 100 parts by weight of the composition.

[0149] In one embodiment, the composition may be per- / poly fluoroalkyl substances-free (PFAS-Free).

[0150] In addition, a composition for a human body contact part of a wearable device according to an embodiment of the present disclosure includes, based on 100 parts by weight of the composition, 60 to 70 parts by weight of hydrogenated nitrile butadiene rubber (HNBR); and 30 to 40 parts by weight of barium sulfate; wherein the hydrogenated nitrile butadiene rubber (HNBR) has an acrylonitrile content of 35% to 45% and a residual double bond of 1.8% to 2.0%, and the composition may have a specific gravity of 1.5 to 1.7.

[0151] In addition, a human body contact part of a wearable device according to an embodiment of the present disclosure may include hydrogenated nitrile butadiene rubber (HNBR); and a high-density inorganic additive; and may have a specific gravity value of 1.5 to 2.0.

[0152] In one embodiment, the human body contact component of the wearable device may have a tensile strength of 10 MPa to 20 MPa.

[0153] In one embodiment, the human body contact part of the wearable device may further include a coating layer formed on the surface and having a surface roughness of 20 μm or less.

[0154] In one embodiment, the coating layer may be a transparent layer comprising at least one selected from the group consisting of urethane, urethane acrylate, and silicone, having a thickness of 10 μm to 30 μm, and having a heat resistance of 100° C. or higher.

[0155] In one embodiment, the human body contact component of the wearable device may have a surface hardness of 60 Showa hardness to 75 Showa hardness.

[0156] In one embodiment, the human body contact component of the wearable device may include at least one selected from the group consisting of a strap, a headset, a head mount, gloves, an earpiece, smart glasses, smart goggles, a human body attachable sensor, and an attachable wearable patch.

[0157] In addition, a strap of a wearable device according to an embodiment of the present disclosure comprises hydrogenated nitrile butadiene rubber (HNBR); barium sulfate; and a silicone coating layer formed on the outermost surface; wherein, based on 100 parts by weight of the strap, the hydrogenated nitrile butadiene rubber (HNBR) is in an amount of 60 parts by weight to 70 parts by weight; The barium sulfate may be 30 to 40 parts by weight, the hydrogenated nitrile butadiene rubber (HNBR) may have an acrylonitrile content of 35 to 45% and a residual double bond of 1.8 to 2.0%, the strap may have a specific gravity of 1.5 to 1.7, a tensile strength of 10 to 20 MPa and a Showa hardness of 60 to 75, and the coating layer may be a transparent layer having a thickness of 10 to 30 μm, a heat resistance of 100° C. or higher and a surface roughness of 20 μm or lower.

[0158] In addition, a method for manufacturing a human body contact part of a wearable device according to an embodiment of the present disclosure may include: an operation of manufacturing a composition by mixing hydrogenated nitrile butadiene rubber and a high-density inorganic additive; an operation of manufacturing a sheet by extrusion molding the composition; an operation of compression molding the sheet; an operation of manufacturing a molded product by cutting the compression molded sheet; an operation of forming a coating layer on a surface of the molded product; and an operation of drying the molded product on which the coating layer is formed.

[0159] In one embodiment, the coating layer may be a transparent layer comprising a silicon-based material and having a thickness of 10 μm to 30 μm and having a heat resistance of 100° C. or higher.

[0160]

[0161] Electronic devices according to the embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments disclosed in this document are not limited to the aforementioned devices.

[0162] The embodiments of this document and the terminology used herein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0163] The term "module" used in the embodiments of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0164] Embodiments of the present document may be implemented as software (e.g., a program (140)) including one or more instructions stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a processor (e.g., a processor (120)) of the machine (e.g., an electronic device (101)) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0165] According to one embodiment, the method according to the embodiments disclosed in the present document may be provided as a computer program product. The computer program product may be traded between sellers and buyers as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)) or may be provided through an application store (e.g., Play Store). TM ) or directly between two user devices (e.g., smart phones), online distribution (e.g., downloading or uploading). In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0166] According to embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0167]

[0168] Although the preferred embodiments have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present disclosure pertains without departing from the scope of the claims. Furthermore, such modifications should not be individually understood from the technical idea or perspective.

Claims

1. Hydrogenated nitrile butadiene rubber (HNBR); and A wearable device for human body contact parts, comprising a high specific gravity inorganic additive and having a specific gravity value of 1.5 to 2.0; A composition for a human body contact part of a wearable device.

2. In paragraph 1, The above hydrogenated nitrile butadiene rubber has an acrylonitrile content of 20 to 50 parts by weight based on 100 parts by weight of the hydrogenated nitrile butadiene rubber. A composition for a human body contact part of a wearable device.

3. In paragraph 1, The above hydrogenated nitrile butadiene rubber has a residual double bond content of 0.9% to 2.0%. A composition for a human body contact part of a wearable device.

4. In paragraph 1, The hydrogenated nitrile butadiene rubber is in an amount of 30 to 70 parts by weight based on 100 parts by weight of the composition. A composition for a human body contact part of a wearable device.

5. In paragraph 1, The above high-density inorganic additive comprises at least one selected from the group consisting of titanium dioxide, silicon dioxide, zinc oxide, barium sulfate, and lithopone, The above high-density inorganic additive is 25 to 50 parts by weight based on 100 parts by weight of the composition. A composition for a human body contact part of a wearable device.

6. In paragraph 1, The above composition is PFAS-Free (per- / poly fluoroalkyl substances-free). A composition for a human body contact part of a wearable device.

7. A composition for a human body contact part of a wearable device, Based on 100 parts by weight of the above composition, Containing 60 to 70 parts by weight of hydrogenated nitrile butadiene rubber (HNBR); and 30 to 40 parts by weight of barium sulfate; The above hydrogenated nitrile butadiene rubber (HNBR) has an acrylonitrile content of 35% to 45% and residual double bonds of 1.8% to 2.0%, The above composition has a specific gravity of 1.5 to 1.7, A composition for a human body contact part of a wearable device.

8. Contains hydrogenated nitrile butadiene rubber (HNBR); and high-density inorganic additives; having a specific gravity value of 1.5 to 2.0, Body contact parts of wearable devices.

9. In paragraph 8, The human body contact part of the above wearable device has a tensile strength of 10 MPa to 20 MPa. Body contact parts of wearable devices.

10. In paragraph 8, The human body contact part of the wearable device further includes a coating layer having a surface roughness of 20 ㎛ or less formed on the surface; The above coating layer is a transparent layer having a thickness of 10 ㎛ to 30 ㎛ and containing at least one selected from the group consisting of urethane, urethane acrylate and silicone, and has a heat resistance of 100 ℃ or higher. Body contact parts of wearable devices.

11. In paragraph 8, The human body contact part of the above wearable device has a surface hardness of 60 Showa hardness to 75 Showa hardness. Body contact parts of wearable devices.

12. In paragraph 8, The human body contact part of the wearable device includes at least one selected from the group consisting of a strap, a headset, a head mount, gloves, an earpiece, smart glasses, smart goggles, a human body-attached sensor, and an attachable wearable patch. Body contact parts of wearable devices.

13. A strap for a wearable device comprising hydrogenated nitrile butadiene rubber (HNBR); barium sulfate; and a silicone coating layer formed on the outermost surface; Based on 100 parts by weight of the strap, the hydrogenated nitrile butadiene rubber (HNBR) is 60 parts by weight to 70 parts by weight; the barium sulfate is 30 parts by weight to 40 parts by weight; The above hydrogenated nitrile butadiene rubber (HNBR) has an acrylonitrile content of 35% to 45% and residual double bonds of 1.8% to 2.0%, The above strap has a specific gravity of 1.5 to 1.7, a tensile strength of 10 to 20 MPa, and a Showa hardness of 60 to 75, The above coating layer is a transparent layer having a thickness of 10 ㎛ to 30 ㎛, and has a heat resistance of 100 ℃ or higher and a surface roughness of 20 ㎛ or less. Strap for wearable devices.

14. An operation of preparing a composition by mixing hydrogenated nitrile butadiene rubber and a high-density inorganic additive; An operation of manufacturing a sheet by extruding the above composition; An action of compression molding the above sheet; An action of cutting the compression molded sheet to manufacture a molded product; An operation of forming a coating layer on the surface of the molded product; and An operation of drying a molded product on which the coating layer is formed; including; A method for manufacturing a human body contact part of a wearable device.

15. In paragraph 14, The above coating layer is a transparent layer containing a silicone-based material and having a thickness of 10 ㎛ to 30 ㎛ and having a heat resistance of 100 ℃ or higher. A method for manufacturing a human body contact part of a wearable device.

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