Electronic device including driving assembly

Abstract

The present disclosure relates to an electronic device including a driving assembly. The driving assembly according to an embodiment disclosed herein is accommodated in an electronic device, and comprises: a motor configured to generate torque and including a shaft that rotates about a rotation axis; a speed-reducing gear assembly connected to the motor; and a driving gear connected to the speed-reducing gear assembly. The speed-reducing gear assembly includes: a first central gear connected to the shaft and including first central gear teeth; a first peripheral gear including first peripheral gear teeth that engage with the first central gear teeth; and a ring gear that is formed in a ring shape about the rotation axis to surround the first peripheral gear and engages with the first peripheral gear. The tooth surfaces of the first central gear include a first end region and a second end region, which are regions at both ends of the tooth surfaces of the first central gear in the rotation axis direction, and the first end region may have a bend formed in a direction in which the tooth thickness of the first central gear teeth decreases. The tooth surfaces of the first peripheral gear may include a third end region corresponding to the first end region and a fourth end region corresponding to the second end region, and the fourth end region may have a bend formed in a direction in which the tooth thickness of the first peripheral gear teeth decreases.

Description

Electronic device including a drive assembly

[0001] The embodiments of the present disclosure relate to an electronic device comprising a drive assembly, for example, an electronic device comprising a drive assembly capable of improving the durability of a gear included in a reduction gear assembly of the drive assembly and improving the stability and efficiency of the reduction gear assembly.

[0002] Due to advancements in information and communication technology and semiconductor technology, various functions are being integrated into a single portable electronic device. For example, electronic devices can implement not only communication functions but also entertainment functions such as games, multimedia functions such as music and video playback, communication and security functions for mobile banking, and functions for schedule management and electronic wallets. These electronic devices are being miniaturized to allow users to carry them conveniently.

[0003] As mobile communication services expand into the realm of multimedia services, there is a need for electronic device displays to increase in size so that users can fully utilize multimedia services in addition to voice calls and short message services. However, the size of electronic device displays is in a trade-off relationship with the miniaturization of electronic devices.

[0004] The information described above may be provided as related art for the purpose of aiding understanding of the present disclosure. No claim or determination is made as to whether any of the foregoing may be applied as prior art in relation to the present disclosure.

[0005] A drive assembly according to one embodiment of the present disclosure comprises: a motor configured to generate rotational force and including a shaft that rotates along a rotation axis, the drive assembly being housed in an electronic device; a reduction gear assembly connected to the motor; and a drive gear connected to the reduction gear assembly, wherein the reduction gear assembly comprises: a first center gear connected to the shaft and including a first center gear tooth; and a first peripheral gear including a first peripheral gear tooth that meshes with the first center gear tooth. The apparatus includes a ring gear formed in a ring shape around the rotation axis to surround the first peripheral gear and meshing with the first peripheral gear, wherein the tooth surface of the first central gear includes a first end region and a second end region, which are two end regions in the direction of the rotation axis of the tooth surface of the first central gear, and the first end region has a curvature formed in a direction in which the tooth thickness of the first central gear tooth decreases, and the tooth surface of the first peripheral gear includes a third end region corresponding to the first end region and a fourth end region corresponding to the second end region, and the fourth end region may have a curvature formed in a direction in which the tooth thickness of the first peripheral gear tooth decreases.

[0006] An electronic device according to one embodiment of the present disclosure comprises: a housing including a first housing portion and a second housing portion movably connected to the first housing portion; a flexible display disposed in the first housing portion and the second housing portion and configured such that at least one of the shape or size changes as the second housing portion moves relative to the first housing portion; and a driving assembly disposed in at least one of the first housing portion or the second housing portion and configured to provide power to cause the second housing portion to move relative to the first housing portion, wherein the driving assembly comprises: a motor including a shaft configured to generate rotational force and rotating along a rotation axis; a reduction gear assembly connected to the motor; and a driving gear connected to the reduction gear assembly, wherein the reduction gear assembly comprises: a first center gear connected to the shaft and including a first center gear tooth; and a first peripheral gear including a first peripheral gear tooth that meshes with the first center gear tooth. The apparatus includes a ring gear meshing with the first peripheral gear, wherein the tooth surface of the first central gear includes a first end region and a second end region, which are end regions in the direction of the rotation axis of the tooth surface of the first central gear, and the first end region has a curvature formed in a direction in which the tooth thickness of the first central gear tooth decreases, and the tooth surface of the first peripheral gear includes a third end region corresponding to the first end region and a fourth end region corresponding to the second end region, and the fourth end region may have a curvature formed in a direction in which the tooth thickness of the first peripheral gear tooth decreases.

[0007] An electronic device according to one embodiment of the present disclosure comprises: a housing including a first housing portion and a second housing portion movably connected to the first housing portion; a flexible display disposed in the first housing portion and the second housing portion and configured such that at least one of the shape or size changes as the second housing portion moves relative to the first housing portion; and a driving assembly disposed in at least one of the first housing portion or the second housing portion and configured to provide power to move the second housing portion relative to the first housing portion, wherein the driving assembly comprises: a motor including a shaft configured to generate rotational force and rotating along a rotation axis; a reduction gear assembly connected to the motor; and a driving gear connected to the reduction gear assembly, wherein the reduction gear assembly comprises: a first center gear connected to the shaft; a first peripheral gear engaged with the first center gear; a first carrier connected to the center of the first peripheral gear and rotating around the rotation axis; a second center gear configured to rotate around the rotation axis together with the first carrier; and a second peripheral gear engaged with the second center gear. and includes a ring gear formed in a ring shape centered on the rotation axis to surround the first peripheral gear and the second peripheral gear, and meshing with the first peripheral gear and the second peripheral gear, wherein the first tooth width of the first central gear and the second tooth width of the second central gear are different from each other, and the third tooth width of the first peripheral gear and the fourth tooth width of the second peripheral gear may be different from each other.

[0008] The aspects, configurations, and / or advantages described above regarding one embodiment of the present disclosure may become more apparent from the following detailed description with reference to the accompanying drawings.

[0009] FIG. 1 is a block diagram of an electronic device in a network environment according to one embodiment of the present disclosure.

[0010] FIG. 2 is a drawing showing a state in which a part of a display according to one embodiment of the present disclosure is housed within a housing.

[0011] FIG. 3 is a drawing showing a state in which a part of a display according to one embodiment of the present disclosure is exposed to the outside of a housing.

[0012] FIG. 4 is an exploded view of an electronic device according to one embodiment of the present disclosure.

[0013] FIG. 5 is a perspective view of a part of an electronic device according to one embodiment of the present disclosure.

[0014] FIG. 6 is a plan view of a part of an electronic device according to one embodiment of the present disclosure.

[0015] FIG. 7 is a plan view of a part of an electronic device according to one embodiment of the present disclosure.

[0016] FIG. 8 is a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0017] FIG. 9 is a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0018] FIG. 10 is an enlarged cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0019] FIG. 11 is a perspective view of a part of an electronic device according to one embodiment of the present disclosure.

[0020] FIG. 12 is a side view of a part of an electronic device according to one embodiment of the present disclosure.

[0021] FIG. 13 briefly illustrates a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0022] FIG. 14 is an enlarged perspective view of a part of an electronic device according to one embodiment of the present disclosure.

[0023] FIG. 15 is an enlarged perspective view of a part of an electronic device according to one embodiment of the present disclosure.

[0024] FIG. 16 briefly illustrates the operation process of a part of an electronic device according to one embodiment of the present disclosure.

[0025] FIG. 17 briefly illustrates the operation process of a part of an electronic device according to one embodiment of the present disclosure.

[0026] FIG. 18 is a graph comparing an electronic device according to one embodiment of the present disclosure with a comparative example.

[0027] FIG. 19 briefly illustrates a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0028] FIG. 20 is a side view of a part of an electronic device according to one embodiment of the present disclosure.

[0029] FIG. 21 briefly illustrates a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0030] FIG. 22 is a side view of a part of an electronic device according to one embodiment of the present disclosure.

[0031] FIG. 23 briefly illustrates a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure.

[0032] FIG. 24 is a side view of a part of an electronic device according to one embodiment of the present disclosure.

[0033] FIG. 25 is an exploded view of an electronic device according to one embodiment of the present disclosure.

[0034] Throughout the attached drawings, similar parts, configurations, and / or structures may be assigned similar reference numbers.

[0035] The following description relating to the attached drawings may provide an understanding of various exemplary embodiments of the present disclosure, including the claims and their corresponding contents. While the exemplary embodiments disclosed in the following description include various specific details to aid understanding, they are to be considered as one of various exemplary embodiments. Accordingly, those skilled in the art will understand that various changes and modifications to the various embodiments described in the present disclosure may be made without departing from the scope and technical spirit of the disclosure. Additionally, for clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0036] The terms and words used in the following description and claims are not limited to their literal meanings but may be used to clearly and consistently describe an embodiment of the present disclosure. Accordingly, it will be apparent to a person skilled in the art that the following description of various embodiments of the disclosure is provided for illustrative purposes, not for the purpose of limiting the scope of the rights or the disclosure defined as equivalent thereto.

[0037] Unless the context clearly indicates otherwise, it should be understood that the singular forms of "a," "an," and "the" include a plural meaning. Thus, for example, "component surface" can be understood to include one or more of the component surfaces.

[0038] FIG. 1 is a block diagram of an electronic device (101) in a network environment (100) according to one embodiment of the present disclosure.

[0039] Referring to FIG. 1, in a network environment (100), an electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network) or with at least one of an electronic device (104) or a server (108) through 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) through a server (108). According to one embodiment, the electronic device (101) may include a processor (120), memory (130), input module (150), sound output module (155), display module (160), audio module (170), sensor module (176), interface (177), connection terminal (178), haptic module (179), camera module (180), power management module (188), battery (189), communication module (190), subscriber identification module (196), or antenna module (197). In some embodiments, at least one of these components (e.g., connection terminal (178)) may be omitted from the electronic device (101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (176), camera module (180), or antenna module (197)) may be integrated into a single component (e.g., display module (160)).

[0040] The processor (120) can control at least one other component (e.g., hardware or software component) of the electronic device (101) connected to the processor (120) by executing software (e.g., program (140)), for example, and can perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (120) can store commands or data received from other components (e.g., sensor module (176) or communication module (190)) in volatile memory (132), process the commands or data stored in volatile memory (132), and store the resulting data in non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., central processing unit or application processor) or an auxiliary processor (123) that can operate independently or together with it (e.g., graphics processing unit, neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor). For example, if the electronic device (101) includes a main processor (121) and an auxiliary processor (123), the auxiliary processor (123) may be configured to use lower power than the main processor (121) or to be specialized for a designated function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as part thereof.

[0041] The auxiliary processor (123) may control at least some of the functions or states associated with at least one component of the electronic device (101) (e.g., display module (160), sensor module (176), or communication module (190)) 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. According to one embodiment, the auxiliary processor (123) (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module (180) or communication module (190)). According to one embodiment, the auxiliary processor (123) (e.g., 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. Such learning may be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or through a separate server (e.g., server (108)). The learning algorithm may 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 may include a plurality of artificial neural network layers.An artificial neural network may be 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 the hardware structure, the artificial intelligence model may include a software structure, either additionally or substantially.

[0042] The memory (130) can store various data used by at least one component of the electronic device (101) (e.g., processor (120) or sensor module (176)). The data may include, for example, input data or output data for software (e.g., program (140)) and related commands. The memory (130) may include volatile memory (132) or non-volatile memory (134).

[0043] The program (140) may be stored as software in memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0044] The input module (150) can receive commands or data to be used for a component of the electronic device (101) (e.g., processor (120)) from outside the electronic device (101) (e.g., user). The input module (150) may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0045] The sound output module (155) can output a sound signal to the outside of the electronic device (101). The sound output module (155) may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback. The receiver may be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part thereof.

[0046] The display module (160) can visually provide information to an external (e.g., 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 said 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 the force generated by said touch.

[0047] The audio module (170) can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150) or output sound through the sound output module (155) or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphones) connected directly or wirelessly to the electronic device (101).

[0048] The sensor module (176) can detect the operating state of the electronic device (101) (e.g., power or temperature) or the external environmental state (e.g., user state) and generate an electrical signal or data value corresponding to the detected state. According to one embodiment, the sensor module (176) may include, for example, a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0049] The interface (177) may support one or more specified protocols that can be used for the electronic device (101) to be connected directly or wirelessly to an external electronic device (e.g., electronic device (102)). According to one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.

[0050] The connection terminal (178) may include a connector through which the electronic device (101) can 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).

[0051] The haptic module (179) can convert an electrical signal into a mechanical stimulus (e.g., vibration or movement) or an electrical stimulus that can be perceived by the user through tactile or kinesthetic senses. According to one embodiment, the haptic module (179) may include, for example, a motor, a piezoelectric element, or an electric stimulation device.

[0052] The camera module (180) can capture still images and video. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0053] The power management module (188) can manage the power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented, for example, as at least part of a power management integrated circuit (PMIC).

[0054] The battery (189) can supply power to at least one component of the electronic device (101). According to one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0055] The communication module (190) can support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between an 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 include one or more communication processors that operate independently of the processor (120) (e.g., application processor) and 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., cellular communication module, short-range wireless communication module, or GNSS (global navigation satellite system) communication module) or a wired communication module (194) (e.g., LAN (local area network) communication module, or power line communication module). The corresponding communication module among these communication modules can communicate with an external electronic device (104) through a first network (198) (e.g., a short-range communication network such as Bluetooth, WiFi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network (199) (e.g., 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 may 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 identify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) using subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module (196).

[0056] The wireless communication module (192) can support 5G networks and next-generation communication technologies following 4G networks, for example, new radio access technology. NR access technology can support high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and connection of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low-latency communications (URLLC)). The wireless communication module (192) can support a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate, for example. The wireless communication module (192) can support various technologies for securing performance in the high-frequency band, such as beamforming, massive MIMO (multiple-input and multiple-output), 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), external electronic device (e.g., electronic device (104)), or network system (e.g., second network (199)). According to one embodiment, the wireless communication module (192) can support a Peak data rate (e.g., 20 Gbps or more) for realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mMTC, or U-plane latency (e.g., downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less) for realizing URLLC.

[0057] An antenna module (197) can transmit a signal or power to or from an external source (e.g., an external electronic device). According to one embodiment, the antenna module (197) may include an antenna comprising a radiator made 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 a first network (198) or a second network (199), may be selected from the plurality of antennas, for example, by a communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device through the selected at least one antenna. According to some embodiments, in addition to the radiator, other components (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module (197).

[0058] According to various 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 to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high frequency band (e.g., mmWave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving a signal of the specified high frequency band.

[0059] At least some of the above components can be connected to each other via a communication method between peripheral devices (e.g., bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)) and exchange signals (e.g., commands or data) with each other.

[0060] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) through a server (108) connected to a second network (199). Each of the external electronic devices (102, or 104) may be the same or different type of device as the electronic device (101). According to one embodiment, all or part of the operations performed on the electronic device (101) may be performed on one or more of the external electronic devices (102, 104, or 108). For example, if the electronic device (101) needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device (101) may request one or more external electronic devices to perform at least part of the function or service instead of performing the function or service itself or additionally. One or more external electronic devices that receive the above request may execute at least part of the requested function or service, or 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 provide the result as is or additionally processed as at least part of the response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device (101) may provide ultra-low latency services using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server using machine learning and / or neural networks. According to one embodiment, the external electronic device (104) or the server (108) may be included within a 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.

[0061] FIG. 2 is a drawing showing a state in which a part of a display according to one embodiment of the present disclosure is housed within a housing. FIG. 3 is a drawing showing a state in which a part of a display according to one embodiment of the present disclosure is exposed to the outside of the housing.

[0062] Specifically, FIG. 2 is a drawing showing a state in which a second display area of ​​a display (e.g., the display area (A2) of FIG. 3) is housed within a housing according to one embodiment of the present disclosure. FIG. 3 is a drawing showing a state in which a second display area of ​​a display is exposed to the outside of the housing according to one embodiment of the present disclosure. FIG. 2 and FIG. 3 show a structure in which a flexible display (203) (e.g., a flexible display or a rollable display) extends in the longitudinal direction (e.g., +Y direction) when viewed from the front of an electronic device (101). However, the extension direction of the flexible display (203) is not limited to a single direction (e.g., +Y direction). For example, the extension direction of the flexible display (203) may be designed to extend upward (+Y direction), to the right (e.g., +X direction), to the left (e.g., -X direction), and / or downward (e.g., -Y direction).

[0063] The state illustrated in FIG. 2 may be referred to as a slide-in state of the electronic device (101) or a state in which the second display area (A2) of the flexible display (203) is closed. The state illustrated in FIG. 3 may be referred to as a slide-out state of the electronic device (101) or a state in which the second display area (A2) of the flexible display (203) is open.

[0064] According to one embodiment, an electronic device (101) (e.g., the electronic device (101) of FIG. 1) may include a housing (210). The housing (210) may include a first housing portion (201) and a second housing portion (202) movably connected to the first housing portion (201). In one embodiment, the electronic device (101) may be interpreted as having a structure in which the first housing portion (201) is slidably positioned relative to the second housing portion (202). According to one embodiment, the second housing portion (202) may be positioned to reciprocate a certain distance relative to the first housing portion (201) in the illustrated direction, for example, in the direction indicated by the arrow (1).

[0065] According to one embodiment, the second housing portion (202) may be referred to as a slide portion or a slide housing and may be movable relative to the first housing portion (201). According to one embodiment, the second housing portion (202) may accommodate various electrical and electronic components such as a circuit board or a battery. When the electronic device (101) is in a slide-in state, the second housing portion (202) may be defined as a retracted position, and when the electronic device (101) is in a slide-out state, the second housing portion (202) may be defined as an extended position.

[0066] According to one embodiment, the slide-in state (or slide-out state of the electronic device (101)) of the electronic device (101) may be changed to the slide-out state (or slide-in state of the electronic device (101)) of the electronic device (101) based on defined user input. For example, the slide-in state (or slide-out state of the electronic device (101) of the electronic device (101) may be changed to the slide-out state (or slide-in state of the electronic device (101)) in response to user input on a physical button exposed through a part of the first housing part (201) or a part of the second housing part (202). For example, the slide-in state (or slide-out state of the electronic device (101)) may be changed to the slide-out state (or slide-in state of the electronic device (101)) in response to touch input on an executable object displayed within a screen display area (e.g., a first display area (A1)). For example, the slide-in state (or the slide-out state of the electronic device (101)) may be changed to the slide-out state (or the slide-in state of the electronic device (101)) in response to a touch input having a contact point on the screen display area (e.g., the first display area (A1)) and a pressing force greater than or equal to a reference strength. For example, the slide-in state (or the slide-out state of the electronic device (101)) may be changed to the slide-out state (or the slide-in state of the electronic device (101)) in response to a voice input received through the microphone of the electronic device (101). For example, the slide-in state (or the slide-out state of the electronic device (101)) may be changed to the slide-out state (or the slide-in state of the electronic device (101)) in response to an external force applied to the first housing part (201) and / or the second housing part (202) to move the second housing part (202) relative to the first housing part (201).For example, the slide-in state (or the slide-out state of the electronic device (101)) may be changed to the slide-out state (or the slide-in state of the electronic device (101)) in response to user input identified from an external electronic device (e.g., earbuds or a smart watch) connected to the electronic device (101). However, the slide-in and slide-out operation of the electronic device (101) is not limited thereto.

[0067] According to one embodiment, the first housing portion (201) may accommodate an actuator (e.g., motor), a speaker, a shim socket, and / or a sub-circuit board electrically connected to the main circuit board. The second housing portion (202) may accommodate a main circuit board equipped with electrical components such as an application processor (AP) and a communication processor (CP). According to one embodiment, the second housing portion (202) may accommodate an actuator, a speaker, a shim socket, and / or a sub-circuit board electrically connected to the main circuit board, and the first housing portion (201) may accommodate a main circuit board equipped with electrical components such as an application processor (AP) and a communication processor (CP). According to one embodiment, the sub-circuit board and the main circuit board may be placed in the first housing portion (201) or in the second housing portion (202).

[0068] According to one embodiment, the first housing portion (201) may include a first cover member (211) (e.g., a main case). The first cover member (211) may include a first-1 side wall (211a), a first-2 side wall (211b) extending from the first-1 side wall (211a), and a first-3 side wall (211c) extending from the first-1 side wall (211a) and substantially parallel to the first-2 side wall (211b). According to one embodiment, the first-2 side wall (211b) and the first-3 side wall (211c) may be formed substantially perpendicular to the first-1 side wall (211a).

[0069] According to one embodiment, the first-1 side wall (211a), the first-2 side wall (211b), and the first-3 side wall (211c) of the first cover member (211) may be formed with one side (e.g., front face) open to accommodate (or surround) at least a portion of the second housing portion (202). For example, at least a portion of the second housing portion (202) may be surrounded by the first housing portion (201) and may slide in a direction parallel to the first surface (e.g., the first surface (F1) in FIG. 4) while being guided by the first housing portion (201), e.g., in the direction of arrow (1). According to one embodiment, the first-1 side wall (211a), the first-2 side wall (211b), and / or the first-3 side wall (211c) of the first cover member (211) may be formed integrally. According to one embodiment, the first-1 side wall (211a), the first-2 side wall (211b), and / or the first-3 side wall (211c) of the first cover member (211) may be formed as separate structures and combined or assembled.

[0070] According to one embodiment, the first cover member (211) may be formed to surround at least a portion of the flexible display (203). For example, at least a portion of the flexible display (203) may be formed to surround by the first-1 sidewall (211a), the first-2 sidewall (211b), and / or the first-3 sidewall (211c) of the first cover member (211).

[0071] According to one embodiment, the second housing portion (202) may include a second cover member (221) (e.g., a slide plate). The second cover member (221) may have a plate shape and may include a first surface (e.g., the first surface (F1) of FIG. 4) that supports internal components. For example, the second cover member (221) may support at least a portion of the flexible display (203) (e.g., a first display area (A1)). According to one embodiment, the second cover member (221) may be referred to as a front cover.

[0072] According to one embodiment, the second cover member (221) may include a second-1 side wall (221a), a second-2 side wall (221b) extending from the second-1 side wall (221a), and a second-3 side wall (221c) extending from the second-1 side wall (221a) and substantially parallel to the second-2 side wall (221b). According to one embodiment, the second-2 side wall (221b) and the second-3 side wall (221c) may be formed substantially perpendicular to the second-1 side wall (221a).

[0073] According to various embodiments, the second housing portion (202) can form a slide-in state and a slide-out state of the electronic device (101) as it moves in a first direction (e.g., direction (1)) parallel to the second-2 sidewall (221b) or the second-3 sidewall (221c). In the slide-in state of the electronic device (101), the second housing portion (202) is located at a first distance from the first-1 sidewall (211a) of the first housing portion (201), and in the slide-out state of the electronic device (101), the second housing portion (202) can be moved to be located at a second distance greater than the first distance from the first-1 sidewall (211a) of the first housing portion (201). In one embodiment, when the electronic device (101) is in a sliding state, the first housing portion (201) may be formed to surround a portion of the second-2 side wall (221b) and the second-3 side wall (221c).

[0074] According to one embodiment, the electronic device (101) may have an intermediate state between the slide-in state of FIG. 2 (e.g., fully closed state) and the slide-out state of FIG. 3 (e.g., fully opened state). In the intermediate state of the electronic device (101), the distance between the first-1 sidewall (211a) and the second-1 sidewall (221a) may be shorter than the distance between the first-1 sidewall (211a) and the second-1 sidewall (221a) of the electronic device (101) in the fully open state, and longer than the distance between the first-1 sidewall (211a) and the second-1 sidewall (221a) of the electronic device (101) in the fully closed state. According to one embodiment, as at least a portion of the flexible display (203) slides in the intermediate state of the electronic device (101), the area exposed to the outside may vary. For example, in an intermediate state of the electronic device (101), the ratio of the width (length in the X direction) and the height (length in the Y direction) of the flexible display (203) and / or the distance between the first-1 side wall (211a) and the second-1 side wall (221a) may be changed based on the slide movement of the electronic device (101).

[0075] According to one embodiment, the electronic device (101) may include a flexible display (203), a key input device (245), a connector hole (243), an audio module (247a, 247b), or a camera module (249a, 249b). According to one embodiment, the electronic device (101) may further include an indicator (e.g., an LED (light emitting diode) device) or various sensor modules.

[0076] According to one embodiment, the flexible display (203) may be disposed in a first housing portion (201) and a second housing portion (202). The flexible display (203) may be formed such that the size of the portion visible from the front side of the housing (210) changes based on the sliding movement of the second housing portion (202). For example, the flexible display (203) may be configured such that its shape or size changes as the second housing portion (202) moves relative to the first housing portion (201). According to one embodiment, the flexible display (203) may include a first display area (A1) and a second display area (A2) configured to be exposed to the outside of the electronic device (101) based on the sliding movement of the second housing portion (202).

[0077] According to one embodiment, the first display area (A1) may be substantially disposed on the second housing portion (202). For example, the first display area (A1) may be disposed on the second cover member (221) of the second housing portion (202). According to one embodiment, the second display area (A2) extends from the first display area (A1) and may be housed inside the first housing portion (201) or visually exposed outside the electronic device (101) as the second housing portion (202) slides relative to the first housing portion (201). According to one embodiment, as the electronic device (101) changes from a slide-in state to a slide-out state, the flexible display (203) may be extended in the downward direction (e.g., -Y direction) of the electronic device (101). For example, in the slide-out state of the electronic device (101), the second display area (A2) may be visually exposed from below the electronic device (101) (e.g., in the -Y direction). According to one embodiment, as the electronic device (101) changes from a slide-in state to a slide-out state, the flexible display (203) may be extended in the upward direction (e.g., in the +Y direction) of the electronic device (101). For example, in the slide-out state of the electronic device (101), the second display area (A2) may be visually exposed from above the electronic device (101) (e.g., in the +Y direction).

[0078] According to one embodiment, the second display area (A2) moves substantially guided by a portion of the first housing portion (201) (e.g., the curved surface (213a) of FIG. 4) and may be housed in a space located inside the first housing portion (201) or exposed to the outside of the electronic device (101). According to one embodiment, the second display area (A2) may move based on a sliding movement of the second housing portion (202) in a first direction (e.g., the direction indicated by arrow (1). For example, while the second housing portion (202) is sliding, a portion of the second display area (A2) may be deformed into a curved shape at a position corresponding to the curved surface (213a) of the first housing portion (201).

[0079] According to one embodiment, when viewed from above the second cover member (221) (e.g., front cover), if the electronic device (101) is varied from a slide-in state to a slide-out state (e.g., if the second housing portion (202) is slid out so as to extend relative to the first housing portion (201), the second display area (A2) can be gradually exposed to the outside of the first housing portion (201) and can form a substantially flat plane together with the first display area (A1). According to one embodiment, the flexible display (203) may be combined with or adjacent to a touch sensing circuit, a pressure sensor capable of measuring the intensity (pressure) of the touch, and / or a digitizer for detecting a magnetic field type stylus pen. According to one embodiment, regardless of whether the electronic device (101) is in a slide-in or slide-out state, a portion of the exposed second display area (A2) may be located on a portion of the first housing (e.g., the curved surface (213a) of FIG. 4), and a portion of the second display area (A2) may maintain a curved shape at a position corresponding to the curved surface (213a).

[0080] According to one embodiment, the key input device (245) may be located in a portion of the housing (210) (e.g., the first housing portion (201) and / or the second housing portion (202)). Depending on the appearance and usage conditions, the illustrated key input device (245) may be omitted, or the electronic device (101) may be designed to include additional key input device(s). According to one embodiment, the electronic device (101) may include an unillustrated key input device, for example, a home key button, or a touch pad placed around the home key button. According to one embodiment, at least a portion of the key input device (245) may be placed on the first-1 sidewall (211a), the first-2 sidewall (211b), and / or the first-3 sidewall (211c) of the first housing portion (201). According to one embodiment, at least a portion of the key input device (245) may be placed on the second-1 sidewall (221a), the second-2 sidewall (221b) and / or the second-3 sidewall (221c) of the second housing portion (202).

[0081] According to one embodiment, the connector hole (243) may be omitted depending on the embodiment and may accommodate a connector (e.g., a USB connector) for transmitting and receiving power and / or data with an external electronic device. According to one embodiment (not shown), the electronic device (101) may include a plurality of connector holes (243), and some of the plurality of connector holes (243) may function as connector holes for transmitting and receiving audio signals with an external electronic device. In the illustrated embodiment, the connector hole (243) is located in the second housing portion (202), but is not limited thereto, and the connector hole (243) or an unillustrated connector hole may be located in the first housing portion (201).

[0082] According to one embodiment, the audio module (247a, 247b) may include at least one speaker hole (247a) or at least one microphone hole (247b). One of the speaker holes (247a) may be provided as a receiver hole for voice calls, and the other may be provided as an external speaker hole. The electronic device (101) includes a microphone for acquiring sound, and the microphone may acquire sound from outside the electronic device (101) through the microphone hole (247b). According to one embodiment, the electronic device (101) may include a plurality of microphones to detect the direction of sound. According to one embodiment, the electronic device (101) may include an audio module in which the speaker hole (247a) and the microphone hole (247b) are implemented as a single hole, or may include a speaker in which the speaker hole (247a) is excluded (e.g., a piezo speaker). According to one embodiment, the speaker hole (247a) and the microphone hole (247b) may be located in the first housing portion (201) and / or the second housing portion (202).

[0083] According to one embodiment, the camera modules (249a, 249b) may include a first camera module (249a) (e.g., a front camera) and a second camera module (249b) (e.g., a rear camera). According to one embodiment, the electronic device (101) may include at least one of a wide-angle camera, a telephoto camera, or a macro camera, and, according to an embodiment, may measure the distance to a subject by including an infrared projector and / or an infrared receiver. The camera modules (249a, 249b) may include one or more lenses, an image sensor, and / or an image signal processor. The first camera module (249a) may be positioned to face in the same direction as the flexible display (203) (e.g., the +Z direction in FIG. 4). For example, the first camera module (249a) may be placed around the first display area (A1) or in an area overlapping with the flexible display (203), and if placed in an area overlapping with the flexible display (203), it may capture a subject by passing through the flexible display (203). According to one embodiment, the first camera module (249a) may not be visually exposed to the screen display area (e.g., the first display area (A1)) and may include a hidden under-display camera (UDC). According to one embodiment, the second camera module (249b) may capture a subject in a direction opposite to the first display area (A1) (e.g., the -Z direction in FIG. 4). According to one embodiment, the first camera module (249a) and / or the second camera module (249b) may be placed on the second housing portion (202). According to one embodiment, the second camera module (249b) may be formed in multiple numbers to provide various arrangements. For example, the multiple second camera modules (249b) may be arranged along a width direction (X-axis direction) that is substantially perpendicular to the slide movement direction (e.g., Y-axis direction) of the electronic device (101).As another example, a plurality of second camera modules (249b) may be arranged along the slide movement direction (e.g., Y-axis direction) of the electronic device (101). As another example, a plurality of second camera modules (249b) may be arranged along N * M rows and columns as a matrix.

[0084] According to one embodiment, the second camera module (249b) is not visually exposed to the outside of the electronic device (101) when the electronic device (101) is in a slide-in state, and can photograph the outside of the electronic device (101) when the electronic device (101) is in a slide-out state. According to one embodiment, the second camera module (249b) can photograph the outside of the electronic device (101) when the electronic device (101) is in a slide-in state and / or a slide-out state. For example, at least a portion of the housing (210) (e.g., the first rear plate (215) and / or the second rear plate (225) of FIG. 4) is substantially transparent, and the second camera module (249b) can photograph the outside of the electronic device (101) by passing through the first rear plate (215) and / or the second rear plate (225). According to one embodiment, the second camera module (249b) is visually exposed to the outside of the electronic device (101) in a slide-in state and a slide-out state of the electronic device (101), and can photograph the outside. For example, the first housing portion (201) (e.g., the first rear plate (215) of FIG. 4) may include an opening (201a) for the second camera module (249b).

[0085] According to one embodiment, an indicator (not shown) of an electronic device (101) may be placed in a first housing portion (201) or a second housing portion (202) and may provide status information of the electronic device (101) as a visual signal by including a light-emitting diode. Sensor modules (261a, 261b) of the electronic device (101) may generate electrical signals or data values ​​corresponding to the internal operating state of the electronic device (101) or the external environmental state. Sensor modules (261a, 261b) may include a proximity sensor, a fingerprint sensor and / or a biometric sensor (e.g., an iris / face recognition sensor or a heart rate monitoring (HRM) sensor). In one embodiment, sensor modules (261a, 261b) may further include at least one of a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a color sensor, an infrared (IR) sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. According to one embodiment, the sensor modules (261a, 261b) may be placed in the first housing portion (201) and / or the second housing portion (202). For example, the sensor modules (261a, 261b) may include a first sensor module (261a) placed on the front of the electronic device (101) (e.g., a proximity sensor or an ambient light sensor) and / or a second sensor module (261b) placed on the rear of the electronic device (101) (e.g., a heart rate monitoring (HRM) sensor).

[0086] FIG. 4 is an exploded view of an electronic device according to one embodiment of the present disclosure.

[0087] The detailed configuration of an electronic device (101) according to one embodiment of the present disclosure that is not described below may be the same or similar as the detailed configuration of an electronic device (101) according to one embodiment of the present disclosure described in relation to FIGS. 2 and FIGS. 3.

[0088] According to one embodiment, an electronic device (101) (e.g., the electronic device (101) of FIGS. 1 to 3) may include a first housing portion (201), a second housing portion (202), a flexible display (230), and a driving assembly (240). The configuration of the first housing portion (201), the second housing portion (202), and the flexible display (230) of FIG. 4 may be all or partly the same as the configuration of the first housing portion (201), the second housing portion (202), and the flexible display (203) of FIG. 2 and / or FIG. 3.

[0089] According to one embodiment, the first housing portion (201) may include a first cover member (211) (e.g., the first cover member (211) of FIG. 2 and FIG. 3), a frame (213), and a first rear plate (215).

[0090] According to one embodiment, the first cover member (211) may accommodate at least a portion of the frame (213) and may accommodate a component (e.g., battery (289)) located in the frame (213). According to one embodiment, the first cover member (211) may be formed to surround at least a portion of the second housing portion (202). According to one embodiment, the first cover member (211) may protect a component (e.g., second circuit board (249) and frame (213)) located in the first housing portion (201) from external impact. According to one embodiment, a second circuit board (249) electrically connected to an electrical component (e.g., actuator, speaker, shim socket and / or first circuit board (248)) may be connected to the first cover member (211).

[0091] According to one embodiment, the frame (213) may be connected to the first cover member (211). For example, the frame (213) is connected to the first cover member (211), and the second housing portion (202) may move relative to the first cover member (211) and / or the frame (213). According to one embodiment, the frame (213) may accommodate a battery (289). For example, the frame (213) may include a groove for accommodating the battery (289). The frame (213) may be connected to the battery cover (289a) and may surround at least a portion of the battery (289) together with the battery cover (289a). According to one embodiment, the frame (213) may include a curved portion (213a) facing the flexible display (230).

[0092] According to one embodiment, the first rear plate (215) may substantially form at least a part of the exterior of the first housing part (201) or the electronic device (101). For example, the first rear plate (215) may be attached to the outer surface of the first cover member (211). According to one embodiment, the first rear plate (215) may provide a decorative effect on the exterior of the electronic device (101). The first rear plate (215) may be made using at least one of metal, glass, synthetic resin, or ceramic.

[0093] According to one embodiment, the second housing portion (202) may include a second cover member (221) (e.g., the second cover member (221) of FIG. 2 and FIG. 3), a rear cover (223), and a second rear plate (225).

[0094] According to one embodiment, the second cover member (221) is connected to the first housing part (201) through a guide rail (250) and can move in a straight reciprocating motion in one direction (e.g., the direction of arrow (1) in FIG. 3) while being guided by the guide rail (250).

[0095] According to one embodiment, the second cover member (221) may support at least a portion of the display panel (231). For example, the second cover member (221) may include a first surface (F1), and the first display area (A1) of the display panel (231) may be substantially located on the first surface (F1) and maintained in a flat form. According to one embodiment, the second cover member (221) may be formed of a metal material and / or a non-metal (e.g., a polymer) material. According to one embodiment, a first circuit board (248) that accommodates electronic components (e.g., the processor (120) and / or memory (130) of FIG. 1) may be connected to the second cover member (221). According to one embodiment, the second cover member (221) may protect components located in the second housing portion (202) (e.g., the first circuit board (248) and the rear cover (223)) from external impact.

[0096] According to one embodiment, the rear cover (223) can protect a component (e.g., the first circuit board (248)) located on the second cover member (221). For example, the rear cover (223) may be connected to the second cover member (221) and formed to surround at least a portion of the first circuit board (248). According to one embodiment, the rear cover (223) may include an antenna pattern (e.g., at least one antenna element (223a)) for communicating with an external electronic device. For example, if the rear cover (223) is formed from an injection molded product of a dielectric material (e.g., an antenna carrier), the at least one antenna element (223a) may be placed on the outer surface of the rear cover (223) (e.g., one surface facing the -Z axis direction). For example, the at least one antenna element (223a) may include a laser direct structuring (LDS) antenna pattern formed on the outer surface of the rear cover (223). For example, at least one antenna element (223a) may be formed in such a way that it is embedded during the injection molding of the rear cover (223). For example, at least one antenna element (223a) may be configured to transmit or receive a wireless signal in a designated frequency band (e.g., legacy band) by being electrically connected to a wireless communication circuit (e.g., wireless communication module (192) of FIG. 1) disposed on the first circuit board (248).

[0097] According to one embodiment, the second rear plate (225) may substantially form at least a part of the exterior of the second housing part (202) or the electronic device (101). For example, the second rear plate (225) may be attached to the outer surface of the second cover member (221). According to one embodiment, the second rear plate (225) may provide a decorative effect on the exterior of the electronic device (101). The second rear plate (225) may be made using at least one of metal, glass, synthetic resin, or ceramic.

[0098] According to one embodiment, the flexible display (230) may include a display panel (231) (e.g., the flexible display (203) of FIG. 2 and / or FIG. 3)) and a multibar structure (232) supporting the display panel (231). According to one embodiment, the display panel (231) may be referred to as a flexible display, a foldable display, and / or a rollable display. According to one embodiment, a first display area (A1) of the display panel (231) may be supported by a rigid body, and a second display area (A2) may be supported by a bendable structure. For example, the first display area (A1) may be supported by a first surface (F1) of a second cover member (221) or a plate not shown. The second display area (A2) may be supported by the multibar structure (232).

[0099] According to one embodiment, the multibar structure (232) may be connected to or attached to at least a portion of the display panel (231) (e.g., a second display area (A2)). According to one embodiment, as the second housing portion (202) slides, the multibar structure (232) may move relative to the first housing portion (201). In the slide-in state of the electronic device (101) (e.g., FIG. 2), the multibar structure (232) may be housed mostly inside the first housing portion (201) and positioned between the first cover member (211) and the second cover member (221). According to one embodiment, at least a portion of the multibar structure (232) may move in correspondence with a curved surface (213a) located at the edge of the frame (213). According to one embodiment, the multibar structure (232) may be referred to as a display support member or support structure and may be in the form of a single elastic plate.

[0100] According to one embodiment, the drive assembly (240) can move the second housing portion (202) relative to the first housing portion (201). For example, the drive assembly (240) may include an actuator (240a) configured to generate a driving force for the sliding movement of the second housing portion (202) relative to the first housing portion (201). The drive assembly (240) may include a gear (240c) (e.g., a pinion) connected to the actuator (240a) and a rack gear (240d) configured to mesh with said gear. Referring to FIG. 4, components of the drive assembly (240) (e.g., actuator (240a), reduction gear assembly (240b), gear (240c) and rack gear (240d)) inverted within a P1 circle (e.g., facing the -Z axis direction) are illustrated.

[0101] According to one embodiment, the housing where the rack gear (240d) is located and the housing where the actuator (240a) is located may be different. According to one embodiment, the rack gear (240d) may be connected to a first housing portion (201), and the actuator (240a) may be connected to a second housing portion (202). According to one embodiment of the present disclosure, the actuator (240a) may be connected to a first housing portion (201), and the rack gear (240d) may be connected to a second housing portion (202).

[0102] According to one embodiment, the actuator (240a) may be controlled by a processor (e.g., the processor (120) of FIG. 1). For example, the processor (120) may include an actuator driver driving circuit and may transmit a pulse width modulation (PWM) signal to the actuator (240a) to control the speed of the actuator (240a) and / or the torque of the actuator (240a). According to one embodiment, the actuator (240a) may be electrically connected to a processor (e.g., the processor (120) of FIG. 1) located on a circuit board (e.g., the first circuit board (248) of FIG. 4) using a flexible printed circuit board.

[0103] According to one embodiment, the second housing portion (202) may accommodate a first circuit board (248) (e.g., a main board). According to one embodiment, a processor, memory, and / or an interface may be mounted on the first circuit board (248). The processor may include, for example, one or more of a central processing unit, an application processor, a graphics processing unit, an image signal processor, a sensor hub processor, or a communication processor. According to various embodiments, the first circuit board (248) may include a flexible printed circuit board type radio frequency cable (FRC). The first circuit board (248) may be placed on at least a portion of the second cover member (221) and may be electrically connected to an antenna module (e.g., the antenna module (197) of FIG. 1) and a communication module (e.g., the communication module (190) of FIG. 1).

[0104] According to one embodiment, the memory may include, for example, volatile memory or non-volatile memory.

[0105] According to one embodiment, the interface may include, for example, an HDMI (high definition multimedia interface), a USB (universal serial bus) interface, an SD card interface, and / or an audio interface. The interface may, for example, electrically or physically connect the electronic device (101) to an external electronic device and may include a USB connector, an SD card / MMC (multimedia card) connector, or an audio connector.

[0106] According to one embodiment, the electronic device (101) may include a second circuit board (249) (e.g., a sub-circuit board) spaced apart from a first circuit board (248) (e.g., a main circuit board) within a first housing portion (201). The second circuit board (249) may be electrically connected to the first circuit board (248) through a flexible substrate. The second circuit board (249) may be electrically connected to electrical components placed in the end portion of the electronic device (101), such as a battery (289) or a speaker and / or a shim socket, to transmit signals and power. According to one embodiment, the second circuit board (249) may accommodate an antenna member (271) (e.g., a coil) or be connected to the antenna member (271). The antenna member (271) may include a multi-function coil (MFC) antenna comprising a wireless charging antenna for wireless charging functions, an NFC antenna for NFC (neat field communication) functions, and / or a magnetic secure transmission (MST) antenna for performing electronic payment functions. For example, the battery (289) may receive power from an external electronic device using the antenna member (271) for wireless charging. As another example, the battery (289) may transfer power to an external electronic device using the antenna member (271) for wireless charging.

[0107] According to one embodiment, the battery (289) is a device for supplying power to at least one component of the electronic device (101) and may include a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. The battery (289) may be integrally disposed inside the electronic device (101) or may be detachably disposed from the electronic device (101). According to one embodiment, the battery (289) may be formed as a single integrated battery or may include a plurality of separate batteries. According to one embodiment, the battery (289) may be located in the frame (213). For example, the battery (289) may be surrounded by the frame (213) and the battery cover (289a). According to one embodiment, it may be located within the second housing portion (202) and may slide together with the second housing portion (202).

[0108] According to one embodiment, the guide rail (250) can guide the movement of the multibar structure (232). For example, the multibar structure (232) can slide along a slit (251) formed in the guide rail (250). According to one embodiment, the guide rail (250) can be connected to a first housing portion (201). For example, the guide rail (250) can be connected to a first cover member (211) and / or a frame (213). According to one embodiment, the slit (251) may be referred to as a groove or recess formed on the inner surface of the guide rail (250). Referring to FIG. 4, the guide rail (250) is shown enlarged within a P2 circle.

[0109] According to one embodiment, the guide rail (250) can provide force to the multibar structure (232) based on the driving of the actuator (240a).

[0110] According to one embodiment, when the electronic device (101) changes from a slide-in state to a slide-out state, at least a portion of the second housing portion (202) can be slid to be exposed to the outside from the first housing portion (201) through the drive of the actuator (240a). For example, the gear (240c) can be rotated in a first rotational direction based on the drive of the actuator (240a). The rack gear (240d) can be fixed to the first housing portion (201), and the actuator (240a) can move together with the second housing portion (202). The second housing portion (202) can be slid to be exposed to the outside of the first housing portion (201) based on the movement of the actuator (240a) moving along the rack gear (240d).

[0111] According to one embodiment, when the electronic device (101) changes from a slide-in state to a slide-out state, the inner portion (252) of the guide rail (250) can provide force to the multibar structure (232). The multibar structure (232) receiving the force moves along the slit (251) of the guide rail (250), and the second housing portion (202) can slide to extend relative to the first housing portion (201). At least a portion of the flexible display (230) that was accommodated between the first cover member (211) and the frame (213) can be extended to the front.

[0112] According to one embodiment, when the electronic device (101) changes from a slide-out state to a slide-in state, at least a portion of the second housing portion (202) can be slid to be inserted into the first housing portion (201) through the drive of the actuator (240a). For example, the gear (240c) can be rotated in a second rotational direction opposite to the first rotational direction based on the drive of the actuator (240a). The rack gear (240d) can be fixed to the first housing portion (201), and the actuator (240a) can move together with the second housing portion (202). The second housing portion (202) can be slid to enter the first housing portion (201) based on the movement of the actuator (240a) moving along the rack gear (240d).

[0113] According to one embodiment, when the electronic device (101) changes from a slide-out state to a slide-in state, the outer portion (253) of the guide rail (250) can provide force to the bent multibar structure (232). The multibar structure (232) that receives the force moves along the slit (251) of the guide rail (250), and can slide so that at least a portion of the second housing portion (202) is received in the first housing portion (201). At least a portion of the flexible display (230) can be received between the first cover member (211) and the frame (213).

[0114] According to one embodiment, the electronic device (101) may be set to stop in a designated intermediate state between a slide-in state and a slide-out state by controlling the drive of the actuator (240a) (free stop function). According to one embodiment, the electronic device (101) may be varied to a slide-in state, an intermediate state, or a slide-out state through user operation when no driving force is provided to the actuator (240a).

[0115] FIG. 5 is a perspective view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 6 is a plan view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 7 is a plan view of a part of an electronic device according to one embodiment of the present disclosure.

[0116] The detailed configuration of the electronic device (101) according to one embodiment of the present disclosure not described below may be the same or similar as the detailed configuration of the electronic device (101) described in relation to FIGS. 2 to 4.

[0117] According to one embodiment, the electronic device (101) may include a circuit board (248), a flexible circuit board (288), and a battery (289). The circuit board (248) may be substantially the same as the first circuit board (248) described with reference to FIGS. 2 through 4. The battery (289) may be substantially the same as the battery (289) described with reference to FIGS. 2 through 4. The circuit board (248) and the battery (289) may be placed inside a housing (e.g., the housing (210) of FIGS. 2 through 4). The electronic device (101) may include a flexible circuit board (288). The flexible circuit board (288) may connect the circuit board (248) and the battery (289). The flexible circuit board (288) can be folded or unfolded when the second housing part (202) moves relative to the first housing part (201).

[0118] According to one embodiment, the electronic device (101) may include a driving assembly (240). The description of the driving assembly (240) may be substantially the same as the description of the driving device (240) described with reference to FIG. 4. The driving assembly (240) may generate power to move a housing (e.g., housing (210) of FIG. 2 through 4). The driving assembly (240) may move a second housing portion (202). A battery (289) may supply power to the driving assembly (240). A processor (120) included in a circuit board (248) may control the driving of the driving assembly (240). The driving assembly (240) (driving device) may be named a "driving device". The driving assembly (240) may be named a "motor assembly". The drive assembly (240) may be named a "power transmission device." The drive assembly (240) may be named a "power transmission assembly."

[0119] According to one embodiment, the drive assembly (240) may include an actuator (240a). The actuator (240a) may generate power. The actuator (240a) may receive power from a battery (289). The actuator (240a) may be referred to as a "power source" and / or a "motor".

[0120] According to one embodiment, the drive assembly (240) may include a reduction gear assembly (240b). The reduction gear assembly (240b) may be connected to an actuator (240a). The reduction gear assembly (240b) may be referred to as a "planet gear assembly".

[0121] According to one embodiment, the drive assembly (240) may include a drive gear (e.g., the gear (240c) of FIG. 4). The drive gear (e.g., the gear (240c) of FIG. 4) may be connected to a reduction gear assembly (240b). The drive gear (e.g., the gear (240c) of FIG. 4) may be connected to a reduction gear assembly (240b). The drive gear may be referred to as a 'pinion gear'.

[0122] According to one embodiment, the electronic device (101) may include a rack gear (240d). The rack gear (240d) may be connected to a drive assembly (240). The rack gear (240d) may be connected to a drive gear (e.g., the gear (240c) of FIG. 4). For example, the rack gear (240d) may mesh with the drive gear (e.g., the gear (240c) of FIG. 4).

[0123] According to one embodiment, rotational power generated in the actuator (240a) can be transmitted to a reduction gear assembly (240b). The reduction gear assembly (240b) can reduce the revolution per minute (RPM) of the rotational power generated in the actuator (240a). The reduction gear assembly (240b) can increase the torque of the rotational power generated in the actuator (240a). The reduction gear assembly (240b) can increase the torque of the rotational power generated in the actuator (240a) and transmit it to a drive gear (e.g., gear (240c) of FIG. 4). The drive gear (e.g., gear (240c) of FIG. 4) can be engaged with a rack gear (240d). By means of the rotational power transmitted to the drive gear (e.g., gear (240c) of FIG. 4), the drive gear (e.g., gear (240c) of FIG. 4) can move linearly along the rack gear (240d). The rack gear (240d) can be fixed to the first housing part (201), and the drive gear (e.g., gear (240c) of FIG. 4) can be fixed to the second housing part (202). When the drive gear (e.g., gear (240c) of FIG. 4) moves linearly along the rack gear (240d), the second housing part (202) can move linearly together with the drive gear (e.g., gear (240c) of FIG. 4). When the drive gear (e.g., gear (240c) of FIG. 4) moves linearly along the rack gear (240d), the second housing part (202) can move relative to the first housing part (201).

[0124] Referring to FIG. 6, as shown in FIG. 2, at least a portion of the second housing portion (202) may be in a state where it is retracted into the first housing portion (201) (e.g., a slide-in state). The state of the electronic device (101) shown in FIG. 2 and FIG. 6 may be defined as a “first state.” In the first state of the electronic device (101), the drive gear (e.g., the gear (240c) in FIG. 4) may be located closer to the first end (EP1) than to the second end (EP2) of the rack gear (240d).

[0125] Referring to FIG. 7, as illustrated in FIG. 3, at least a portion of the second housing portion (202) may be in a state where it is pulled out of the first housing portion (201) (e.g., a slide-out state). The state of the electronic device (101) illustrated in FIG. 3 and FIG. 6b may be defined as a “second state.” In the second state of the electronic device (101), the drive gear (e.g., the gear (240c) in FIG. 4) may be located closer to the second end (EP2) than to the first end (EP1) of the rack gear (240d).

[0126] Referring to FIGS. 6 and 7, when changing from a first state to a second state of the electronic device (101), the actuator (240a), reduction gear assembly (240b), drive gear (e.g., gear (240c) of FIG. 4), and motor (350) can move along the rack gear (240d). When changing from a first state to a second state of the electronic device (101), the actuator (240a), reduction gear assembly (240b), drive gear (e.g., gear (240c) of FIG. 4), and motor (350) can move from the first end (EP1) of the rack gear (240d) toward the second end (EP2).

[0127] FIG. 8 is a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 9 is a cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 10 is an enlarged cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 11 is a perspective view of a part of an electronic device according to one embodiment of the present disclosure.

[0128] Specifically, FIG. 8 is a cross-sectional view of the drive assembly (301) portion, drawn along the line A-A' of FIG. 5. FIG. 9 is drawn along the line A-A' or B-B' of FIG. 8. FIG. 10 is a cross-sectional view showing an enlarged view of the P area of ​​FIG. 8. FIG. 11 is a perspective view showing the second carrier (326) and the center shaft (328).

[0129] Hereinafter, a drive assembly (301) according to one embodiment of the present disclosure may include a motor (310), a reduction gear assembly (320), a drive gear (330), and a rack gear (340), but some of these may be omitted and implemented, and additional configurations are not excluded.

[0130] The detailed configuration of the electronic device (300) not described below may be the same or similar as the detailed configuration of the electronic device (101) described in relation to FIGS. 1 to 7.

[0131] Hereinafter, the reduction gear assembly (320) is described as being composed of two planetary gears, but is not limited thereto, and the reduction gear assembly (320) may be composed of one planetary gear or may be composed of three or more planetary gears.

[0132] Hereinafter, 'first direction' may refer to the +X direction of FIGS. 8 to 11, which is a direction parallel to the rotation axis (Ax) and / or a direction from the motor (310) toward the drive gear (330). 'Second direction' may refer to the -X direction of FIGS. 8 to 11, which is a direction opposite to the first direction (+X direction). Hereinafter, 'first rotation direction' may refer to a rotation direction centered on the rotation axis (Ax), the first sub-rotation axis (sAx1), and / or the second sub-rotation axis (sAx2). 'Second rotation direction' may refer to a rotation direction opposite to the first rotation direction.

[0133] According to one embodiment, the electronic device (300) may include a driving assembly (301) (e.g., the driving assembly (240) of FIGS. 4 to 7). The driving assembly (301) may be disposed in at least one of a first housing portion (e.g., the first housing portion (201) of FIGS. 6 and 7) or a second housing portion (e.g., the second housing portion (202) of FIGS. 6 and 7). The driving assembly (301) may be configured to provide power so that the second housing portion (e.g., the second housing portion (202) of FIGS. 6 and 7) moves relative to the first housing portion (e.g., the first housing portion (201) of FIGS. 6 and 7).

[0134] According to one embodiment, the drive assembly (301) may include a first part (S1), a second part (S2), a third part (S3), and a fourth part (S4). The first part (S1) may generate power. The second part (S2) may receive power from the first part (S1). The second part (S2) may reduce the rotational speed of the power received from the first part (S1) and increase the torque. The third part (S3) may receive power from the second part (S2). The third part (S3) may reduce the rotational speed of the power received from the second part (S2) and increase the torque. The fourth part (S4) may receive power from the third part (S3). The first part (S1) may be named a "power generating portion." The second part (S2) may be named a "first deceleration portion." The third part (S3) may be named the "second deceleration portion." The fourth part (S4) may be named the "driving portion."

[0135] According to one embodiment, the drive assembly (301) may include a motor (310) (e.g., the actuator (240a) of FIGS. 4 to 7). The motor (310) may be positioned in the first part (S1). The motor (310) may be configured to generate rotational force. For example, the motor (310) may generate a force that rotates around a rotation axis (Ax). The motor (310) may provide rotational driving force to the reduction gear assembly (320).

[0136] According to one embodiment, the motor (310) may include a shaft (311). The shaft (311) may extend in a first direction (+X direction) parallel to the rotation axis (Ax). A portion of the shaft (311) may be disposed within the motor (310). A portion of the shaft (311) may protrude from the motor (310) toward the reduction gear assembly (320). For example, a portion of the shaft (311) may protrude and / or extend from the motor (310) to one side (e.g., the first direction (+X direction)). The shaft (311) may rotate along the rotation axis (Ax). For example, the shaft (311) may rotate in a first rotation direction, which is a rotation direction around the rotation axis (Ax).

[0137] According to one embodiment, the motor (310) may include a magnet (312). The magnet (312) may be positioned to surround the shaft (311). According to one embodiment, the motor (310) may include a coil (313). The coil (313) may be positioned to surround the magnet (312). The coil (313) may be configured to receive an electric current. A battery (e.g., the battery (289) of FIG. 5) may supply power to the coil (313). The coil (313) may receive an electric current to form a magnetic field. The shaft (311) may rotate due to the magnetic force between the magnetic field formed in the coil (313) and the magnet (312). According to one embodiment, the motor (310) may include a bearing (314). The bearing (314) may be positioned to surround the shaft (311). The shaft (311) can be configured to rotate inside the bearing (314).

[0138] According to one embodiment, the drive assembly (301) may include a reduction gear assembly (320) (e.g., the reduction gear assembly (240b) of FIGS. 4 to 7). The reduction gear assembly (320) may be positioned in the second part (S2) and the third part (S3). The reduction gear assembly (320) may be positioned on one side of the motor (310) (e.g., the first direction (+X direction) side). The reduction gear assembly (320) may be connected to the motor (310). The reduction gear assembly (320) may connect the shaft (311) and the drive gear (330). The reduction gear assembly (320) may be configured to adjust the rotational speed (RPM) and torque of the shaft (311) and transmit them to the drive gear (330). The reduction gear assembly (320) may be referred to as a "planetary gear assembly," a "reduction device," and / or a "planetary gear device."

[0139] According to one embodiment, the reduction gear assembly (320) may include a first center gear (321). The first center gear (321) may be positioned in a second part (S2). The first center gear (321) may be connected to a shaft (311). For example, the first center gear (321) may be part of the shaft (311). For example, the first center gear (321) may form one end of the shaft (311) (e.g., the end facing the first direction (+X direction)). For example, the first center gear (321) may be provided separately from the shaft (311) and fixed to the shaft (311). The first center gear (321) may rotate together with the shaft (311). The first center gear (321) may rotate about a rotation axis (Ax). For example, the first center gear (321) may rotate in a first rotational direction around a rotation axis (Ax). The first center gear (321) may be composed of a spur gear. The first center gear (321) may be referred to as "center gear," "first sun gear," and / or "sun gear." The first center gear (321) may be a component of the first reduction gear assembly (320a). For example, the first reduction gear assembly (320a) may include the first center gear (321). The first reduction gear assembly (320a) may be referred to as the "first reduction part" and / or "first transmission."

[0140] According to one embodiment, the first center gear (321) may include a first center gear body (3211). The first center gear body (3211) may be a cylindrical portion of the central region of the first center gear (321).

[0141] According to one embodiment, the first center gear (321) may include a first center gear tooth (3212). The first center gear tooth (3212) may be arranged along the outer surface of the first center gear (321). For example, the first center gear tooth (3212) may be arranged along the outer surface of the first center gear body (3211). Each first center gear tooth (3212) may extend in a first direction (+X direction) and / or a second direction (-X direction). The first center gear tooth (3212) may mesh with a first peripheral gear tooth (3222).

[0142] According to one embodiment, the reduction gear assembly (320) may include a first peripheral gear (322). The first peripheral gear (322) may be positioned in a second portion (S2). The first peripheral gear (322) may be positioned between a first center gear (321) and a ring gear (327). The first peripheral gear (322) may be engaged with the first center gear (321). The first peripheral gear (322) may be engaged with the ring gear (327). The first peripheral gear (322) may be configured to revolve around a rotation axis (Ax) around the first center gear (321). For example, the first peripheral gear (322) may revolve around the rotation axis (Ax) in a second rotational direction. The first peripheral gear (322) may be composed of a spur gear. The first peripheral gear (322) may be referred to as "peripheral gear," "first planet gear," and / or "planet gear." The first peripheral gear (322) may be a component of the first reduction gear assembly (320a). For example, the first reduction gear assembly (320a) may include the first peripheral gear (322).

[0143] According to one embodiment, the first peripheral gear (322) may include a plurality of first peripheral gears (322). For example, the first peripheral gear (322) may be provided in three numbers, and the plurality of first peripheral gears (322) may be arranged radially with respect to the first center gear (321). Each first peripheral gear (322) may rotate along a first sub-rotation axis (sAx1). Each first peripheral gear (322) may rotate in the opposite direction to the first center gear (321) around the first sub-rotation axis (sAx1). For example, each first peripheral gear (322) may rotate in a second rotation direction around the first sub-rotation axis (sAx1). The first sub-rotation axis (sAx1) may be formed in a number corresponding to the number of the plurality of first peripheral gears (322). Multiple first sub-rotation axes (sAx1) can revolve around the rotation axis (Ax).

[0144] According to one embodiment, the first peripheral gear (322) may include a first peripheral gear body (3221). The first peripheral gear body (3221) may be a cylindrical portion of the central region of the first peripheral gear (322).

[0145] According to one embodiment, the first peripheral gear (322) may include a first peripheral gear tooth (3222). The first peripheral gear tooth (3222) may be arranged along the outer surface of the first peripheral gear (322). For example, the first peripheral gear tooth (3222) may be arranged along the outer surface of the first peripheral gear body (3221). Each first peripheral gear tooth (3222) may extend in a first direction (+X direction) and / or a second direction (-X direction). The first peripheral gear tooth (3222) may mesh with the first center gear tooth (3212). The first peripheral gear tooth (3222) may mesh with the ring gear tooth (3272).

[0146] According to one embodiment, the reduction gear assembly (320) may include a first carrier (323). The first carrier (323) may be positioned in a second portion (S2). The first carrier (323) may be positioned on one side of the first peripheral gear (322) (e.g., on the side of the first direction (+X direction)). The first carrier (323) may have a disc shape extending in a plane intersecting the rotation axis (Ax). For example, the first carrier (323) may overlap with the respective first sub-rotation axis (sAx1) of the plurality of first peripheral gears (322) in the first direction (+X direction) and / or the second direction (-X direction). The first carrier (323) may be connected to the center of the first peripheral gear (322). For example, the first carrier (323) may be connected to the first peripheral gear (322) at the first sub-rotation axis (sAx1) point of each of the plurality of first peripheral gears (322). The first carrier (323) may be configured to rotate about a rotation axis (Ax). For example, the first carrier (323) may rotate about the rotation axis (Ax) as the first peripheral gear (322) revolves. The first carrier (323) may rotate in a first rotation direction identical to the rotation direction of the first central gear (321) and / or the revolve direction of the first peripheral gear (322). The first carrier (323) may be referred to as a "carrier." The first carrier (323) may be a component of the first reduction gear assembly (320a). For example, the first reduction gear assembly (320a) may include the first carrier (323).

[0147] According to one embodiment, the rotational speed of the rotational power generated by the motor (310) can be primarily reduced in the first reduction gear assembly (320a) (e.g., first center gear (321), first peripheral gear (322) and first carrier (323)). For example, the first reduction gear assembly (320a) may have a first reduction ratio (R1). The first reduction ratio (R1) may mean the value obtained by dividing the angular velocity of the input end of the first reduction gear assembly (320a) (e.g., the angular velocity of the first center gear (321)) by the angular velocity of the output end of the first reduction gear assembly (320a) (e.g., the angular velocity of the first carrier (323)). The first reduction ratio (R1) may be a value obtained by adding 1 to the value obtained by dividing the number of ring gear teeth (3272) by the number of first center gear teeth (3212) (e.g., first reduction ratio (R1) = (number of ring gear teeth (3272) / number of first center gear teeth (3212)) + 1). The first reduction ratio (R1) may have a value greater than 1. A first reduction ratio (R1) greater than 1 may mean that the rotational speed of the first carrier (323) is lower than the rotational speed of the first center gear (321).

[0148] According to one embodiment, the torque of the rotational power generated by the motor (310) can be primarily increased in the first reduction gear assembly (320a). For example, the second torque (T2) generated by the rotation of the first carrier (323) may be the value obtained by multiplying the first torque (T1) generated by the rotation of the first center gear (321) by the first reduction ratio (R1).

[0149] According to one embodiment, the reduction gear assembly (320) may include a second center gear (324). The second center gear (324) may be positioned in a third part (S3). The second center gear (324) may be positioned on one side of the first carrier (323) (e.g., the first direction (+X direction) side). For example, the second center gear (324) may be part of the first carrier (323). For example, the second center gear (324) may be a part protruding toward the first direction (+X direction) from the part through which the rotation axis (Ax) of the disc-shaped first carrier (323) passes. For example, the second center gear (324) may be provided separately from the first carrier (323) and fixed to the first carrier (323). The second center gear (324) may be configured to rotate around the rotation axis (Ax) together with the first carrier (323). The second center gear (324) may rotate about a rotation axis (Ax). For example, the second center gear (324) may rotate about the rotation axis (Ax) in a first rotation direction. The second center gear (324) may be referred to as "center gear," "second sun gear," and / or "sun gear." The second center gear (324) may be a component of the second reduction gear assembly (320b). For example, the second reduction gear assembly (320b) may include the second center gear (324). The second reduction gear assembly (320b) may be referred to as the "second reduction part" and / or "second transmission."

[0150] According to one embodiment, the second center gear (324) may include a second center gear body (3241). The second center gear body (3241) may be a cylindrical portion of the central region of the second center gear (324).

[0151] According to one embodiment, the second center gear (324) may include a second center gear tooth (3242). The second center gear tooth (3242) may be arranged along the outer surface of the second center gear (324). For example, the second center gear tooth (3242) may be arranged along the outer surface of the second center gear body (3241). Each second center gear tooth (3242) may extend in a first direction (+X direction) and / or a second direction (-X direction). The second center gear tooth (3242) may mesh with the second peripheral gear tooth (3252).

[0152] According to one embodiment, the reduction gear assembly (320) may include a second peripheral gear (325). The second peripheral gear (325) may be positioned in a third part (S3). The second peripheral gear (325) may be positioned between the second center gear (324) and the ring gear (327). The second peripheral gear (325) may be engaged with the second center gear (324). The second peripheral gear (325) may be engaged with the ring gear (327). The second peripheral gear (325) may be engaged with the second center gear (324). The second peripheral gear (325) may be configured to revolve around a rotation axis (Ax) around the second center gear (324). For example, the second peripheral gear (325) may revolve around the rotation axis (Ax) in a second rotational direction. The second peripheral gear (325) may be composed of a spur gear. The second peripheral gear (325) may be referred to as "peripheral gear," "second planet gear," and / or "planet gear." The second peripheral gear (325) may be a component of the second reduction gear assembly (320b). For example, the second reduction gear assembly (320b) may include the second peripheral gear (325).

[0153] According to one embodiment, the second peripheral gear (325) may include a plurality of second peripheral gears (325). For example, the second peripheral gear (325) may be provided in three numbers, and the plurality of second peripheral gears (325) may be arranged radially with respect to the second center gear (324). Each second peripheral gear (325) may rotate along a second sub-rotation axis (sAx2). Each second peripheral gear (325) may rotate in the opposite direction to the second center gear (324). For example, each second peripheral gear (325) may rotate in a second rotational direction around the second sub-rotation axis (sAx2). The second sub-rotation axis (sAx2) may be formed in a number corresponding to the number of the plurality of second peripheral gears (325). The plurality of second sub-rotation axes (sAx2) may revolve around the rotation axis (Ax).

[0154] According to one embodiment, the second peripheral gear (325) may include a second peripheral gear body (3251). The second peripheral gear body (3251) may be a cylindrical portion of the central region of the second peripheral gear (325).

[0155] According to one embodiment, the second peripheral gear (325) may include a second peripheral gear tooth (3252). The second peripheral gear tooth (3252) may be arranged along the outer surface of the second peripheral gear (325). For example, the second peripheral gear tooth (3252) may be arranged along the outer surface of the second peripheral gear body (3251). Each second peripheral gear tooth (3252) may extend in a first direction (+X direction) and / or a second direction (-X direction). The second peripheral gear tooth (3252) may mesh with the second center gear tooth (3242). The second peripheral gear tooth (3252) may mesh with the ring gear tooth (3272).

[0156] According to one embodiment, the reduction gear assembly (320) may include a second carrier (326). The second carrier (326) may be positioned in a third portion (S3). The second carrier (326) may be positioned on one side of the second peripheral gear (325) (e.g., on the side of the first direction (+X direction)). The second carrier (326) may have a disc shape extending in a plane intersecting the rotation axis (Ax). For example, the second carrier (326) may overlap with the respective second sub-rotation axis (sAx2) of the plurality of second peripheral gears (325) in the first direction (+X direction) and / or the second direction (-X direction). The second carrier (326) may be connected to the center of the second peripheral gear (325). For example, the second carrier (326) may be connected to the second peripheral gear (325) at the second sub-rotation axis (sAx2) point of each of the plurality of second peripheral gears (325). The second carrier (326) may be configured to rotate about a rotation axis (Ax). For example, the second carrier (326) may rotate about the rotation axis (Ax) as the second peripheral gear (325) revolves. The second carrier (326) may rotate in a first rotation direction identical to the rotation direction of the second central gear (324) and / or the revolve direction of the second peripheral gear (325). The second carrier (326) may be referred to as a "carrier." The second carrier (326) may be a component of the second reduction gear assembly (320b). For example, the second reduction gear assembly (320b) may include the second carrier (326).

[0157] According to one embodiment, the rotational speed of the output end (e.g., the first carrier (323)) of the first reduction gear assembly (320a) may be reduced secondarily in the second reduction gear assembly (320b) (e.g., the second center gear (324), the second peripheral gear (325), and the second carrier (326)). For example, the second reduction gear assembly (320b) may have a second reduction ratio (R2). The second reduction ratio (R2) may mean the value obtained by dividing the angular velocity of the input end of the second reduction gear assembly (320b) (e.g., the angular velocity of the second center gear (324)) by the angular velocity of the output end of the second reduction gear assembly (320b) (e.g., the angular velocity of the second carrier (326)). The second reduction ratio (R2) may be a value obtained by adding 1 to the value obtained by dividing the number of ring gear teeth (3272) by the number of second center gear teeth (3242) (e.g., second reduction ratio (R2) = (number of ring gear teeth (3272) / number of second center gear teeth (3242)) + 1). The second reduction ratio (R2) may have a value greater than 1. A second reduction ratio (R2) greater than 1 may mean that the rotational speed of the second carrier (326) is lower than the rotational speed of the second center gear (324).

[0158] According to one embodiment, the torque generated at the output end of the first reduction gear assembly (320a) (e.g., the first carrier (323)) can be increased at the second reduction gear assembly (320b). For example, the third torque (T3) generated by the rotation of the second carrier (326) may be the value obtained by multiplying the second torque (T2) generated by the rotation of the second center gear (324) by the second reduction ratio (R2).

[0159] According to one embodiment, the reduction gear assembly (320) may include a ring gear (327). The ring gear (327) may be positioned in the second part (S2) and the third part (S3). The ring gear (327) may be formed in a ring shape around a rotation axis (Ax). For example, the ring gear (327) may have a cylindrical shape extending in a first direction (+X direction) and / or a second direction (-X direction). The ring gear (327) may be configured to surround a first peripheral gear (322). The ring gear (327) may be configured to surround a second peripheral gear (325). The ring gear (327) may mesh with the first peripheral gear (322). The ring gear (327) may mesh with the second peripheral gear (325). The ring gear (327) may be configured as an internal gear. In one embodiment, the ring gear (327) may be provided corresponding to each of the first reduction gear assembly (320a) and the second reduction gear assembly (320b). For example, the ring gear (327) may include a first ring gear engaged with the first peripheral gear (322) and a second ring gear (327) engaged with the second peripheral gear (325).

[0160] According to one embodiment, the ring gear (327) may include a ring gear body (3271). The ring gear body (3271) may have a cylindrical shape. The ring gear (327) may include ring gear teeth (3272). The ring gear teeth (3272) may be arranged along the inner circumference of the ring gear (327) (e.g., the ring gear body (3271)). Each ring gear tooth (3272) may extend in a first direction (+X direction) and / or a second direction (-X direction). The ring gear teeth (3272) may mesh with a first peripheral gear tooth (3222). The ring gear teeth (3272) may mesh with a second peripheral gear tooth (3252).

[0161] According to one embodiment, the drive assembly (301) may include a drive gear (330) (e.g., the gear (240c) of FIG. 4). The drive gear (330) may be positioned in the fourth part (S4). The drive gear (330) may be positioned on one side of the reduction gear assembly (320) (e.g., the first direction (+X direction) side). The drive gear (330) may be positioned on one side of the second carrier (326) (e.g., the first direction (+X direction) side). The drive gear (330) may be connected to the second carrier (326). The drive gear (330) may rotate in a first rotational direction around a rotation axis (Ax) together with the second carrier (326). The drive gear (330) may be engaged with a rack gear (340). The drive gear (330) may be referred to as a 'pinion gear'. For example, the drive gear (330) may be a pinion gear that can be operated by meshing with the rack gear (340).

[0162] According to one embodiment, the drive assembly (301) may include a rack gear (340) (e.g., the rack gear (240d) of FIGS. 4 to 7). The rack gear (340) may be positioned in the fourth portion (S4). The rack gear (340) may extend in a direction intersecting the first direction (+X direction) and / or the second direction (-X direction). For example, the rack gear (340) may extend along the direction in which the second housing portion (e.g., the second housing portion (202) of FIGS. 6 and 7) moves relative to the first housing portion (e.g., the first housing portion (201) of FIGS. 6 and 7). The rack gear (340) may be engaged with the drive gear (330). The rack gear (340) may be fixed to the first housing portion (e.g., the first housing portion (201) of FIGS. 6 and 7).

[0163] According to one embodiment, the drive assembly (301) may include a support member (350). The support member (350) may surround at least a portion of the drive gear (330). The support member (350) may be fixed to a second housing portion (e.g., the second housing portion of FIGS. 6 and 7 (e.g., the second housing portion (202) of FIGS. 6 and 7)). The support member (350) may include a coupling hole (351). The coupling hole (351) may be formed by opening in the support member (350). The support member (350) may be fixed to the second housing portion (e.g., the second housing portion (202) of FIGS. 6 and 7) by a coupling member (not shown) penetrating the coupling hole (351) being fixed to the second housing portion (e.g., the second housing portion (202) of FIGS. 6 and 7).

[0164] According to one embodiment, with reference to FIGS. 10 and FIGS. 11, the reduction gear assembly (320) may include a center shaft (328). The center shaft (328) may extend along a rotation axis (Ax). The center shaft (328) may be configured to pass through a shaft (311), a first center gear (321), a first carrier (323), and a second center gear (324). The center shaft (328) may be fixed to a second carrier (326). The center shaft (328) may be configured to prevent the first center gear (321), the first peripheral gear (322), the first carrier (323), the second center gear (324), and the second peripheral gear (325) from being eccentric with respect to the shaft (311).

[0165] According to one embodiment, the center shaft (328) may be fixed to the second carrier (326). The center shaft (328) may rotate at substantially the same angular velocity as the second carrier (326). The center shaft (328) may rotate at a different angular velocity than the shaft (311), the first center gear (321), the first carrier (323), and the second center gear (324).

[0166] According to one embodiment, a gap may be formed between the center shaft (328) (e.g., rod (3281)) and the first shaft (311), the first center gear (321), the first carrier (323), and the second center gear (324). For example, the center shaft (328) may not be in contact with the first shaft (311). For example, the center shaft (328) may not be in contact with the first center gear (321). For example, the center shaft (328) may not be in contact with the first carrier (323). For example, the center shaft (328) may not be in contact with the second center gear (324). Through this, different angular velocities between the center shaft (328), the shaft (311), the first center gear (321), the first carrier (323), and the second center gear (324) may be realized.

[0167] According to one embodiment, the center shaft (328) may include a rod (3281). The rod (3281) may extend in a direction parallel to the axis of rotation (Ax) (e.g., a first direction (+X direction) and / or a second direction (-X direction)). The rod (3281) may pass through a portion of the shaft (311) (e.g., an end region facing the first direction (+X direction) of the shaft (311), a first center gear (321), a first carrier (323), a second center gear (324), and a second carrier (326).

[0168] According to one embodiment, the center shaft (328) may include a flange portion (3282). The flange portion (3282) may extend radially outward from the rod (3281). The flange portion (3282) may be positioned at the end of the rod (3281) facing the first direction (+X direction). The flange portion (3282) may be positioned on one side of the second carrier (326) (e.g., the side facing the first direction (+X direction)). The flange portion (3282) may be fixed to the second carrier (326). For example, the flange portion (3282) (or the center shaft (328)) may be fixed to the second carrier (326) by a coupling member (3284) penetrating the flange portion (3282) and being coupled to the second carrier (326). In this way, the center shaft (328) can be easily disassembled and reassembled through a structure that fixes the center shaft (328) to the second carrier (326) using a connecting member (3284). In one embodiment, the connecting member (3284) may not be provided. For example, the center shaft (328) may be fixed to the second carrier (326) by protruding toward the second carrier (326) from the flange portion (328) and being coupled to the second carrier (326). In one embodiment, the center shaft (328) may be fixed to the second carrier (326) through a separate mechanical coupling mechanism between the flange portion (3282) and the second carrier (326).

[0169] According to one embodiment, the center shaft (328) may include a plurality of grooves (3283). The plurality of grooves (3283) may be formed on the outer surface of the rod (3281). The plurality of grooves (3283) may be formed in a portion overlapping with the shaft (311), the first center gear (321), the first carrier (323), and / or the second center gear (324). The plurality of grooves (3283) may be configured to receive a lubricant.

[0170] FIG. 12 is a side view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 13 is a simplified cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 14 is an enlarged perspective view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 15 is an enlarged perspective view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 16 is a simplified illustration of the operation process of a part of an electronic device according to one embodiment of the present disclosure. FIG. 17 is a simplified illustration of the operation process of a part of an electronic device according to one embodiment of the present disclosure. FIG. 18 is a graph comparing an electronic device according to one embodiment of the present disclosure with a comparative example.

[0171] Specifically, FIG. 12 is an enlarged side view showing the motor (310), the first center gear (321), the first peripheral gear (322), the first carrier (323), the second center gear (324), and the second peripheral gear (325). FIG. 13 is a simplified diagram showing the motor (310), the first center gear (321), the first peripheral gear (322), the first carrier (323), the second center gear (324), the second peripheral gear (325), and the second carrier (326). FIG. 14 is an enlarged view showing the first center gear teeth (3212) and / or the second center gear teeth (3242). FIG. 15 is an enlarged view showing the first peripheral gear teeth (3222) and / or the second peripheral gear teeth (3252). FIG. 16 illustrates a case where the motor (310) provides rotational force in a first rotational direction, showing the arrangement relationship between the first center gear tooth (3212) and the first peripheral gear tooth (3222), and the arrangement relationship between the second center gear tooth (3242) and the second peripheral gear tooth (3252). FIG. 17 illustrates a case where the motor (310) provides rotational force in a second rotational direction opposite to the first rotational direction, showing the arrangement relationship between the first center gear tooth (3212) and the first peripheral gear tooth (3222), and the arrangement relationship between the second center gear tooth (3242) and the second peripheral gear tooth (3252). FIG. 18 is a graph showing the change in angular velocity over time of a first peripheral gear (322) in the case where the first bend (C1) is formed on the first center gear tooth surface (CF1) and the second bend (C2) is formed on the first peripheral gear tooth surface (PF1) (e.g., Example), and in the case where the first bend (C1) and the second bend (C2) are not formed (e.g., Comparative Example).

[0172] The detailed configuration of the drive assembly (301) not described below may be the same or similar as the detailed configuration of the drive assembly (240) described in relation to FIGS. 4 to 7 and / or the detailed configuration of the drive assembly (301) described in relation to FIGS. 8 to 11.

[0173] According to one embodiment, the first center gear tooth (3212) may include a first center gear tooth surface (CF1). The first center gear tooth surface (CF1) may be a surface of the first center gear tooth (3212) facing the first peripheral gear tooth (3222). The first center gear tooth surface (CF1) may extend in a first direction (+X direction) and / or a second direction (-X direction). The first center gear tooth surface (CF1) may constitute both sides of the first center gear tooth (3212). For example, the first center gear tooth surface (CF1) may be positioned on both sides of the first center gear tooth (3212). The first center gear tooth surface (CF1) may be referred to as a "center gear tooth surface" and / or a "tooth surface."

[0174] According to one embodiment, the tooth surface of the first center gear (321) (e.g., the first center gear tooth surface (CF1)) includes a first end region (EA1) and a second end region (EA2), which are the two end regions of the tooth surface of the first center gear (321) (e.g., the first center gear tooth surface (CF1)), and the first end region (EA1) may have a curvature formed in a direction in which the tooth thickness (TT1) of the first center gear tooth (3212) decreases. For example, the first center gear tooth surface (CF1) may be curved such that the tooth thickness (TT1) of the first center gear tooth (3212) decreases as it moves away from the center in a direction parallel to the rotation axis (Ax) of the first center gear tooth (3212) (e.g., the first direction (+X direction) and / or the second direction (-X direction)) at either the first direction (+X direction) side end region or the second direction (-X direction) side end region of the first center gear tooth surface (CF1). Through this, when eccentricity occurs between the first center gear (321) and the first peripheral gear (322) and the end of the first center gear tooth (3212) contacts the first peripheral gear tooth surface (PF1), the curved portion of the first center gear tooth (3212) comes into contact with the first peripheral gear tooth surface (PF1), thereby preventing or mitigating the concentration of stress on the first peripheral gear tooth (3222). For example, as the first center gear tooth (3212) moves relative to the first peripheral gear tooth (3222), the portion of the curved portion of the first center gear tooth (3212) that contacts the first peripheral gear tooth surface (PF1) may change, and accordingly, the area of ​​the first peripheral gear tooth (3222) subjected to pressure may also change. Therefore, stress is distributed to at least a part of the first peripheral gear tooth surface (PF1). This is in contrast to the embodiment without curves, in which case the edge of the first center gear tooth can come into contact with nearly the same point of the first peripheral gear tooth throughout the interaction.Additionally, since the portion of the first center gear tooth (3212) that contacts the first peripheral gear tooth surface (PF1) is curved, the contact area tends to be larger compared to the non-curved embodiment. The curved portion of the first center gear tooth surface (CF1) may be referred to as the first curved portion (C1). The first curved portion (C1) can be understood as a portion formed roundly on either of the two end regions of the first center gear tooth surface (CF1). The first curved portion (C1) may be placed on each of the first center gear tooth surfaces (CF1) constituting both sides of the first center gear tooth (3212). The first curved portion (C1) may be referred to as a "curved portion," a "curved surface," and / or a "curved surface."

[0175] According to one embodiment, the first peripheral gear tooth (3222) may include a first peripheral gear tooth surface (PF1). The first peripheral gear tooth surface (PF1) may be a surface facing the first center gear tooth (3212) of the first peripheral gear tooth (3222). The first peripheral gear tooth surface (PF1) may extend in a first direction (+X direction) and / or a second direction (-X direction). The first peripheral gear tooth surface (PF1) may constitute both sides of the first peripheral gear tooth (3222). For example, the first peripheral gear tooth surface (PF1) may be positioned on both sides of the first peripheral gear tooth (3222). The first peripheral gear tooth surface (PF1) may be referred to as a "peripheral gear tooth surface" and / or a "tooth surface".

[0176] According to one embodiment, the tooth surface of the first peripheral gear (322) (e.g., the first peripheral gear tooth surface (PF1)) includes a third end region (EA3) corresponding to the first end region (EA1) and a fourth end region (EA4) corresponding to the second end region (EA2), and the fourth end region (EA4) may have a curvature formed in the direction in which the tooth thickness (TT2) of the first peripheral gear tooth (3222) decreases. For example, the first peripheral gear tooth surface (PF1) may be curved such that the tooth thickness (TT2) of the first peripheral gear tooth (3222) decreases as it moves away from the center in a direction parallel to the rotation axis (Ax) of the first peripheral gear tooth (3222) (e.g., the first direction (+X direction) and / or the second direction (-X direction)) in the end area opposite to the curved portion of the first central gear tooth surface (CF1) in the first direction (+X direction) or the second direction (-X direction) of the first peripheral gear tooth (PF1). Through this, when eccentricity occurs between the first center gear (321) and the first peripheral gear (322) and the end of the first peripheral gear tooth (3222) contacts the first center gear tooth surface (CF1), the curved portion of the first peripheral gear tooth (3222) comes into contact with the first center gear tooth surface (CF1), thereby preventing or mitigating the concentration of stress on the first center gear tooth (3212). For example, as the first peripheral gear tooth (3222) moves relative to the first center gear tooth (3212), the portion of the curved portion of the first peripheral gear tooth (3222) that contacts the first center gear tooth surface (CF1) may change, and accordingly, the area of ​​the first center gear tooth (3212) subjected to pressure may also change. Therefore, the stress is distributed to at least a part of the first center gear tooth surface (CF1). This is in contrast to the embodiment without a curve, in which case the edge of the first peripheral gear tooth can come into contact with nearly the same point of the first central gear tooth throughout the interaction.Additionally, since the portion of the first peripheral gear tooth (3222) that contacts the first center gear tooth surface (CF1) is curved, the contact area tends to be larger compared to the non-curved embodiment. The curved portion of the first peripheral gear tooth surface (PF1) may be referred to as the second curved portion (C2). The second curved portion (C2) may be placed on each of the first peripheral gear tooth surfaces (PF1) that constitute both sides of the first peripheral gear tooth (3222). The second curved portion (C2) may be referred to as the "curved portion," "curved surface," and / or "curved surface."

[0177] According to one embodiment, the first bend (C1) and the second bend (C2) may be positioned in at least opposite end regions. For example, referring to FIGS. 16 and 17, it may be understood that when the first peripheral gear (322) is misaligned with respect to the first central gear (321) due to eccentricity between the first central gear (321) and the first peripheral gear (322) caused by tolerance or wear (e.g., when eccentricity occurs), a bend (e.g., first bend (C1) and second bend (C2)) is formed at the point where the first central gear teeth (3212) and the first peripheral gear teeth (3222) come into contact. Through this, stress concentration on at least one of the first center gear teeth (3212) or the first peripheral gear teeth (3222) can be suppressed as eccentricity occurs between the first center gear (321) and the first peripheral gear (322), and wear, breakage, deformation, and / or noise of the first center gear (321) and / or the first peripheral gear (322) can be prevented or mitigated, and the stability and / or efficiency of the reduction gear assembly (320) can be improved. For example, when the first bend (C1) and / or the second bend (C2) is formed, the stress concentration acting on the first center gear teeth (3212) and / or the first peripheral gear teeth (3222) can be reduced by about 15% compared to when the first bend (C1) and / or the second bend (C2) is not formed.

[0178] According to one embodiment, the first end region (EA1) is an end region of the tooth surface of the first center gear (321) (e.g., first center gear tooth surface (CF1)) that is far from the motor (310), and the second end region (EA2) may be an end region of the tooth surface of the first center gear (321) (e.g., first center gear tooth surface (CF1)) that is close to the motor (310). According to one embodiment, the first bend (C1) is formed in the first end region (EA1) and may be bent such that the tooth thickness (TT1) of the first center gear tooth (3212) decreases as it moves away from the motor (310). According to one embodiment, the third end region (EA3) may be an end region far from the motor (310) among the tooth surfaces of the first peripheral gear (322) (e.g., the first peripheral gear tooth surface (PF1)), and the fourth end region (EA4) may be an end region close to the motor (310) among the tooth surfaces of the first peripheral gear (322) (e.g., the first peripheral gear tooth surface (PF1)). According to one embodiment, the second bend (C2) may be formed in the fourth end region (EA4) and may be bent such that the tooth thickness (TT2) of the first peripheral gear tooth (3222) decreases as it moves toward the motor (310). For example, the first bend (C1) may be placed in the end region on the first direction (+X direction) of the first center gear tooth surface (CF1), and the second bend (C2) may be placed in the end region on the second direction (-X direction) of the first peripheral gear tooth surface (PF1). The first bend (C1) can be bent so that the tooth thickness (TT1) of the first center gear tooth (3212) decreases as it moves in the first direction (+X direction). The second bend (C2) can be bent so that the tooth thickness (TT2) of the first peripheral gear tooth (3222) decreases as it moves in the second direction (-X direction).For example, as the first peripheral gear (322) moves within the first tolerance area (TA1) (e.g., the first tolerance area (TA1) of FIG. 13), there is a limit to the range of movement of the first peripheral gear (322) in the second direction (-X direction), so it may be difficult for the end of the first central gear tooth (3212) facing the second direction (-X direction) to come into contact with the first peripheral gear tooth surface (PF1). Accordingly, as illustrated in FIGS. 16 and 17, the first bend (C1) is selectively placed only in the end area of ​​the first direction (+X direction) of the first center gear tooth surface (CF1), and the second bend (C2) is selectively placed only in the end area of ​​the second direction (-X direction) of the first peripheral gear tooth surface (PF1), thereby improving the manufacturing efficiency of the gear (e.g., the first center gear (321) and / or the first peripheral gear (322)) having the bend formed therein and reducing manufacturing costs.

[0179] According to one embodiment, the first bend (C1) may be configured to overlap radially with the end of the first peripheral gear (322) far from the motor (310) and the rotation axis (Ax) when the first peripheral gear (322) moves as far as possible toward the motor (310). For example, the first bend (C1) may be configured to overlap radially with the end of the first peripheral gear (322) facing the first direction (+X direction) and the rotation axis (Ax) when the first peripheral gear (322) moves as far as possible toward the second direction (-X direction). For example, referring to FIG. 13, the first peripheral gear (322) may move within a first tolerance area (TA1) (e.g., the first tolerance area (TA1) of FIG. 13). When the first peripheral gear (322) moves to its maximum extent in the second direction (-X direction), the end of the first peripheral gear (322) facing the first direction (+X direction) and the first bend (C1) formed on the first center gear tooth surface (CF1) overlap each other radially (e.g., in a direction perpendicular to the first direction (+X direction) and / or the second direction (-X direction), so that the end of the first peripheral gear tooth (3222) can come into contact with the first bend (C1) despite the movement of the first peripheral gear (322), thereby preventing or alleviating stress concentration between the first peripheral gear tooth (3222) and the first center gear tooth (3212).

[0180] FIG. 18 illustrates the change in angular velocity over time of a first peripheral gear (322) in the case where a first bend (C1) is formed on the first center gear tooth surface (CF1) and a second bend (C2) is formed on the first peripheral gear tooth surface (PF1) (e.g., the embodiment of FIG. 18), and in the case where the first bend (C1) and the second bend (C2) are not formed (e.g., the comparative example of FIG. 18). Referring to FIG. 18, in the comparative example, the angular velocity of the first peripheral gear (322) changes irregularly over time, whereas in the embodiment, the angular velocity of the first peripheral gear (322) is maintained relatively uniformly over time. Through this, as the first bend (C1) and the second bend (C2) are formed on the first center gear tooth surface (CF1) and the first peripheral gear tooth surface (PF1), respectively, the concentration of stress on the first center gear tooth (3212) and the second center gear tooth (3242) is prevented or relieved, thereby mitigating deformation and / or wear of the teeth, so that torque transmission between the first center gear (321) and the first peripheral gear (322) is stably achieved, and as a result, the operational stability and / or efficiency of the reduction gear assembly (320) is improved.

[0181] According to one embodiment, the second center gear tooth (3242) may include a second center gear tooth surface (CF2). The second center gear tooth surface (CF2) may be a surface of the second center gear tooth (3242) facing the second peripheral gear tooth (3252). The second center gear tooth surface (CF2) may extend in a first direction (+X direction) and / or a second direction (-X direction). The second center gear tooth surface (CF2) may constitute both sides of the second center gear tooth (3242). For example, the second center gear tooth surface (CF2) may be positioned on both sides of the second center gear tooth (3242). The second center gear tooth surface (CF2) may be referred to as a "center gear tooth surface" and / or a "tooth surface."

[0182] According to one embodiment, the second center gear tooth surface (CF2) includes a fifth end region (EA5) and a sixth end region (EA6), which are end regions of the tooth surface of the second center gear (324) (e.g., the second center gear tooth surface (CF2)), and the fifth end region (EA5) may have a curvature formed in a direction in which the tooth thickness (TT3) of the second center gear tooth (3242) decreases. For example, the second center gear tooth surface (CF2) may be curved such that the tooth thickness (TT3) of the second center gear tooth (3242) decreases as it moves away from the center in a direction parallel to the rotation axis (Ax) of the second center gear tooth (3242) (e.g., the first direction (+X direction) and / or the second direction (-X direction)) at either the first direction (+X direction) side end region or the second direction (-X direction) side end region of the second center gear tooth surface (CF2). Through this, when eccentricity occurs between the second center gear (324) and the second peripheral gear (325) and the end of the second center gear tooth (3242) contacts the second peripheral gear tooth surface (PF2), the curved portion of the second center gear tooth (3242) contacts the second peripheral gear tooth surface (PF2), thereby preventing or alleviating stress concentration on the second peripheral gear tooth (3242). The curved portion of the second center gear tooth surface (CF2) may be referred to as the fifth curved portion (C5). The fifth curved portion (C5) can be understood as a portion formed roundly on either of the two end regions of the second center gear tooth surface (CF2). The fifth curved portion (C5) may be placed on each of the second center gear tooth surfaces (CF2) constituting both sides of the second center gear tooth (3242). The fifth bend (C5) may be referred to as a "bend," a "curved surface," and / or a "curved surface."

[0183] According to one embodiment, the second peripheral gear tooth (3252) may include a second peripheral gear tooth surface (PF2). The second peripheral gear tooth surface (PF2) may be a surface of the second peripheral gear tooth (3252) facing the second center gear tooth (3242). The second peripheral gear tooth surface (PF2) may extend in a first direction (+X direction) and / or a second direction (-X direction). The second peripheral gear tooth surface (PF2) may constitute both sides of the second peripheral gear tooth (3252). For example, the second peripheral gear tooth surface (PF2) may be positioned on both sides of the second center gear tooth (3242). The second peripheral gear tooth surface (PF2) may be referred to as a "peripheral gear tooth surface" and / or a "tooth surface."

[0184] According to one embodiment, the tooth surface of the second peripheral gear (325) (e.g., the second peripheral gear tooth surface (PF2)) includes a seventh end region (EA7) corresponding to the fifth end region (EA5) and an eighth end region (EA8) corresponding to the sixth end region (EA6), and the eighth end region (EA8) may have a curvature formed in a direction in which the tooth thickness (TT4) of the second peripheral gear tooth (3252) decreases. For example, the second peripheral gear tooth surface (PF2) may be curved such that the tooth thickness (TT4) of the second peripheral gear tooth (3252) decreases as it moves away from the center in a direction parallel to the rotation axis (Ax) of the second peripheral gear tooth (3252) (e.g., the first direction (+X direction) and / or the second direction (-X direction)) in the end area opposite to the curved portion of the second central gear tooth surface (CF2) in the first direction (+X direction) or the second direction (-X direction) of the second peripheral gear tooth (PF2). Through this, when eccentricity occurs between the second center gear (324) and the second peripheral gear (325) and the end of the second peripheral gear tooth (3252) contacts the second center gear tooth surface (CF2), the curved portion of the second peripheral gear tooth (3252) contacts the second center gear tooth surface (CF2), thereby preventing or alleviating stress concentration on the second center gear tooth (3242). The curved portion of the second peripheral gear tooth surface (PF2) may be referred to as the sixth curve (C6). The sixth curve (C6) may be placed on each of the second peripheral gear tooth surfaces (PF2) constituting both sides of the second peripheral gear tooth (3252). The sixth curve (C6) may be referred to as the "curved portion," "curved surface," and / or "curved surface."

[0185] According to one embodiment, the fifth bend (C5) and the sixth bend (C6) may be positioned in at least opposite end regions. For example, referring to FIGS. 16 and 17, it may be understood that when the second peripheral gear (325) is misaligned with respect to the second central gear (324) due to eccentricity between the second central gear (324) and the second peripheral gear (325) caused by tolerance or wear (e.g., when eccentricity occurs), a bend (e.g., the fifth bend (C5) and the sixth bend (C6)) is formed at the point where the second central gear teeth (3242) and the second peripheral gear teeth (3252) come into contact. Through this, stress concentration on at least one of the second center gear teeth (3242) or the second peripheral gear teeth (3252) can be suppressed as eccentricity occurs between the second center gear (324) and the second peripheral gear (325), and wear, breakage, deformation, and / or noise of the second center gear (324) and / or the second peripheral gear (325) can be prevented or mitigated, and the stability and / or efficiency of the reduction gear assembly (320) can be improved. For example, when the fifth bend (C5) and / or the sixth bend (C6) is formed, the stress concentration acting on the second center gear teeth (3242) and / or the second peripheral gear teeth (3252) can be reduced by about 15% compared to when the fifth bend (C5) and / or the sixth bend (C6) is not formed.

[0186] According to one embodiment, the fifth end region (EA5) is an end region of the tooth surface of the second center gear (324) (e.g., second center gear tooth surface (CF2)) that is far from the motor (310), and the sixth end region (EA6) may be an end region of the tooth surface of the second center gear (324) (e.g., second center gear tooth surface (CF2)) that is close to the motor (310). According to one embodiment, the fifth bend (C5) is formed in the fifth end region (EA5) and may be bent such that the tooth thickness (TT3) of the second center gear tooth (3242) decreases as it moves away from the motor (310). According to one embodiment, the seventh end region (EA7) may be an end region far from the motor (310) among the tooth surfaces of the second peripheral gear (325) (e.g., second peripheral gear tooth surface (PF2)), and the eighth end region (EA8) may be an end region close to the motor (310) among the tooth surfaces of the second peripheral gear (325) (e.g., second peripheral gear tooth surface (PF2)). According to one embodiment, the sixth bend (C6) may be formed in the eighth end region (EA8) and may be bent such that the tooth thickness (TT4) of the second peripheral gear tooth (3252) decreases as it moves toward the motor (310). For example, the fifth bend (C5) may be placed in the end region on the first direction (+X direction) side of the second center gear tooth surface (CF2), and the sixth bend (C6) may be placed in the end region on the second direction (-X direction) side of the second peripheral gear tooth surface (PF2). The fifth bend (C5) can be bent so that the tooth thickness (TT3) of the second center gear tooth (3242) decreases as it moves toward the first direction (+X direction). The sixth bend (C6) can be bent so that the tooth thickness (TT4) of the second peripheral gear tooth (3252) decreases as it moves toward the second direction (-X direction).For example, as the second peripheral gear (325) moves within the second tolerance area (TA2) (e.g., the second tolerance area (TA2) of FIG. 13), there is a limit to the range of movement of the second peripheral gear (325) in the second direction (-X direction), so it may be difficult for the end of the second center gear tooth (3242) facing in the second direction (-X direction) to come into contact with the second peripheral gear tooth surface (PF2). Accordingly, as illustrated in FIGS. 16 and 17, the fifth bend (C5) is selectively placed only in the first direction (+X direction) side end area of ​​the second center gear tooth surface (CF2), and the sixth bend (C6) is selectively placed only in the second direction (-X direction) side end area of ​​the second peripheral gear tooth surface (PF2), thereby improving the manufacturing efficiency of the gear with the formed bend (e.g., the second center gear (324) and / or the second peripheral gear (325)) and reducing manufacturing costs.

[0187] According to one embodiment, the fifth bend (C5) may be configured to overlap radially with the end of the second peripheral gear (325) far from the motor (310) and the axis of rotation (Ax) when the second peripheral gear (325) moves as far as possible toward the motor (310). For example, the fifth bend (C5) may be configured to overlap radially with the end of the second peripheral gear (325) facing the first direction (+X direction) and the axis of rotation (Ax) when the second peripheral gear (325) moves as far as possible toward the second direction (-X direction). For example, referring to FIG. 13, the second peripheral gear (325) may move within a second tolerance area (TA2) (e.g., the second tolerance area (TA2) of FIG. 13). When the second peripheral gear (325) moves to its maximum extent in the second direction (-X direction), the end of the second peripheral gear (325) facing the first direction (+X direction) and the fifth bend (C5) formed on the second center gear tooth surface (CF2) overlap each other radially (e.g., in a direction perpendicular to the first direction (+X direction) and / or the second direction (-X direction), so that the end of the second peripheral gear tooth (3252) can come into contact with the fifth bend (C5) despite the movement of the second peripheral gear (325), thereby preventing or alleviating stress concentration between the second peripheral gear tooth (3252) and the second center gear tooth (3242).

[0188] According to one embodiment, the first center gear tooth surface (CF1) and the first peripheral gear tooth surface (PF1) each include a first bend (C1) and a second bend (C2), and the second center gear tooth surface (CF2) and the second peripheral gear tooth surface (PF2) each include a fifth bend (C5) and a sixth bend (C6), but are not limited thereto. For example, the first bend (C1) and the second bend (C2) may be formed on the first center gear tooth surface (CF1) and the first peripheral gear tooth surface (PF1), respectively, and the fifth bend (C5) and / or the sixth bend (C6) may not be formed. For example, the fifth bend (C5) and the sixth bend (C6) may be formed on the second center gear tooth surface (CF2) and the second peripheral gear tooth surface (PF2), respectively, and the first bend (C1) and / or the second bend (C2) may not be formed.

[0189] According to one embodiment, the first tooth width (Fw1) of the first center gear (321) and the second tooth width (Fw2) of the second center gear (324) may be different from each other. The first tooth width (Fw1) may refer to the length in the first direction (+X direction) and / or the second direction (-X direction) of the first center gear (321) (or, the first center gear tooth (3212)). The first tooth width (Fw1) may be the width of the first center gear (321) in an axial direction parallel to the axis of rotation of the first center gear (321). The first tooth width (Fw1) may be the width of one side of the tooth of the first center gear (321) in an axial direction parallel to the axis of rotation of the first center gear (321). The second tooth width (Fw2) may refer to the length in the first direction (+X direction) and / or the second direction (-X direction) of the second center gear (324) (or, the second center gear tooth (3242)). The second tooth width (Fw2) may be the width of the second center gear (324) in an axial direction parallel to the axis of rotation of the second center gear (324). The second tooth width (Fw2) may be the width of one side of the tooth of the second center gear (324) in an axial direction parallel to the axis of rotation of the second center gear (324). For example, the first tooth width (Fw1) may be smaller than the second tooth width (Fw2). The first torque (T1) acting on the first center gear (321) (e.g., the first torque (T1) applied by the shaft (311)) may be smaller than the second torque (T2) acting on the second center gear (324) (e.g., the second torque (T2) applied by the first carrier (323)). For example, the stress acting on the first center gear (321) may be smaller than the stress acting on the second center gear (324). According to one embodiment, even if the first tooth width (Fw1) of the first center gear (321) is smaller than the second tooth width (Fw2) of the second center gear (324), the first center gear (321) can withstand the stress acting on the first center gear (321).Through this structure, the size of the reduction gear assembly (320) can be optimized, so the space efficiency of the reduction gear assembly (320) and / or housing (e.g., housing (201, 202) of FIGS. 6 and 7) can be improved.

[0190] According to one embodiment, the second tooth width (Fw2) may be smaller than the product of the first tooth width (Fw1) and the first reduction ratio (R1). For example, the first tooth width (Fw1) may be larger than the value obtained by dividing the second tooth width (Fw2) by the first reduction ratio (R1). For example, the safety factor (SPC1) of the first center gear (321) (e.g., tooth root bending strength / allowable stress) may be proportional to the product of the first tooth width (Fw1) and the first reduction ratio (R1) (e.g., first tooth width (Fw1) * first reduction ratio (R1)) (e.g., safety factor (SPC1) of the first center gear (321) ∝ (first tooth width (Fw1) * first reduction ratio (R1)). The safety factor of the second center gear (324) may be proportional to the second tooth width (Fw2) (e.g., safety factor of the second center gear (324) ∝ second tooth width (Fw2)). The following equation may hold between the safety factor (SPC1) of the first center gear (321) and the safety factor (SPC2) of the second center gear (324).

[0191]

[0192] The above [Equation 1] is merely an example to aid understanding, and embodiments of the present disclosure are not limited thereto. For example, the above [Equation 1] may be modified, applied, or extended in various ways.

[0193] Since the safety factor (SPC1) of the first center gear (321) must be greater than the safety factor (SPC2) of the second center gear (324) (e.g., safety factor (SPC1) of the first center gear (321) > safety factor (SPC2) of the second center gear (324)), the following equation may hold between the first tooth width (Fw1) and the second tooth width (Fw2).

[0194]

[0195] The above [Equation 2] is merely an example to aid understanding, and embodiments of the present disclosure may not be limited thereto. For example, the above [Equation 2] may be modified, applied, or extended in various ways.

[0196] For example, if the first tooth width (Fw1) is greater than the value obtained by dividing the second tooth width (Fw2) by the first reduction ratio (R1), the breakage of the first center gear (321) can be prevented or mitigated.

[0197] According to one embodiment, the third tooth width (Fw3) of the first peripheral gear (322) and the fourth tooth width (Fw4) of the second peripheral gear (325) may be different from each other. The third tooth width (Fw3) may refer to the length in the first direction (+X direction) and / or the second direction (-X direction) of the first peripheral gear (322) (or the first peripheral gear tooth (3222)). The third tooth width (Fw3) may be the width of the first peripheral gear (322) in an axial direction parallel to the axis of rotation of the first center gear (321). The third tooth width (Fw3) may be the width of one side of the tooth of the first peripheral gear (322) in an axial direction parallel to the axis of rotation of the first center gear (321). The fourth tooth width (Fw4) may refer to the length in the first direction (+X direction) and / or the second direction (-X direction) of the second peripheral gear (325) (or, the second peripheral gear tooth (3252)). The fourth tooth width (Fw4) may be the width of the second peripheral gear (325) in an axial direction parallel to the axis of rotation of the second center gear (324). The fourth tooth width (Fw4) may be the width of one side of the tooth of the second peripheral gear (325) in an axial direction parallel to the axis of rotation of the second center gear (324). For example, the third tooth width (Fw3) may be smaller than the fourth tooth width (Fw4). The third torque (T3) acting on the first peripheral gear (322) may be smaller than the fourth torque (T4) acting on the second peripheral gear (325). For example, the stress acting on the first peripheral gear (322) may be smaller than the stress acting on the second peripheral gear (325). According to one embodiment, even if the third tooth width (Fw3) of the first peripheral gear (322) is smaller than the fourth tooth width (Fw4) of the second peripheral gear (325), the first peripheral gear (322) can withstand the stress acting on the first peripheral gear (322). Through such a structure, the size of the reduction gear assembly (320) can be optimized, so the space efficiency of the reduction gear assembly (320) and / or housing (e.g., housing (201, 202) of FIGS. 6 and 7) can be improved.

[0198] According to one embodiment, the fourth tooth width (Fw4) may be smaller than the product of the third tooth width (Fw3) and the first reduction ratio (R1). For example, the third tooth width (Fw3) may be larger than the value obtained by dividing the fourth tooth width (Fw4) by the first reduction ratio (R1). For example, the safety factor (SFP1) of the first peripheral gear (322) (e.g., tooth root bending strength / allowable stress) may be proportional to the product of the third tooth width (Fw3) and the first reduction ratio (R1) (e.g., third tooth width (Fw3) * first reduction ratio (R1)) (e.g., safety factor (SFP1) of the first peripheral gear (322) ∝ (third tooth width (Fw3) * first reduction ratio (R1)). The safety factor of the second peripheral gear (325) may be proportional to the fourth tooth width (Fw4) (e.g., safety factor of the second peripheral gear (325) ∝ fourth tooth width (Fw4)). The following equation may hold between the safety factor (SFP1) of the first peripheral gear (322) and the safety factor (SFP2) of the second peripheral gear (325).

[0199]

[0200] The above [Equation 3] is merely an example to aid understanding, and embodiments of the present disclosure are not limited thereto. For example, the above [Equation 3] may be modified, applied, or extended in various ways.

[0201] Since the safety factor (SFP1) of the first peripheral gear (322) must be greater than the safety factor (SFP2) of the second peripheral gear (325) (e.g., safety factor (SFP1) of the first peripheral gear (322) > safety factor (SFP2) of the second peripheral gear (325)), the following equation may hold between the third tooth width (Fw3) and the fourth tooth width (Fw4).

[0202]

[0203] The above [Equation 4] is merely an example to aid understanding, and embodiments of the present disclosure are not limited thereto. For example, the above [Equation 4] may be modified, applied, or extended in various ways.

[0204] For example, if the third tooth width (Fw3) is greater than the value obtained by dividing the fourth tooth width (Fw4) by the first reduction ratio (R1), the breakage of the first peripheral gear (322) can be prevented or mitigated.

[0205] According to one embodiment, the ratio of the first tooth width (Fw1) to the second tooth width (Fw2) may be substantially the same as the ratio of the third tooth width (Fw3) to the fourth tooth width (Fw4). For example, the ratio of the first tooth width (Fw1) to the second tooth width (Fw2) and the ratio of the third tooth width (Fw3) to the fourth tooth width (Fw4) may both be the first reduction ratio (R1).

[0206] FIG. 19 is a simplified cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 20 is a side view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 21 is a simplified cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 22 is a side view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 23 is a simplified cross-sectional view of a part of an electronic device according to one embodiment of the present disclosure. FIG. 24 is a side view of a part of an electronic device according to one embodiment of the present disclosure.

[0207] Specifically, FIGS. 19, 21, and 23 are side views of a motor (410), a first center gear (421), a first peripheral gear (422), a first carrier (423), a second center gear (424), and a second peripheral gear (425). FIGS. 20, 22, and 24 are diagrams briefly illustrating a motor (410), a first center gear (421), a first peripheral gear (422), a first carrier (423), a second center gear (424), a second peripheral gear (425), and a second carrier (426).

[0208] The detailed configuration of the electronic device (400) not described below may be the same or similar as the detailed configuration of the electronic device (101) described in relation to FIGS. 1 to 7 and / or the detailed configuration of the electronic device (300) described in relation to FIGS. 8 to 18.

[0209] The detailed configuration of the drive assembly (401) not described below may be the same or similar as the detailed configuration of the drive assembly (240) described in relation to FIGS. 4 to 7 and / or the detailed configuration of the drive assembly (301) described in relation to FIGS. 8 to 18.

[0210] According to one embodiment, the first center gear tooth surface (CF1) may include a third bend (C3). The third bend (C3) may be formed in the end region opposite to the end region where the first bend (C1) is formed. For example, the third bend (C3) may be formed in the second end region (EA2) and may be bent so that the tooth thickness of the first center gear tooth (4212) decreases as it moves toward the motor (410). For example, the third bend (C3) may be placed in the end region on the second direction (-X direction) side of the first center gear tooth surface (CF1). The third bend (C3) may be bent so that the tooth thickness of the first center gear tooth (4212) decreases as it moves toward the second direction (-X direction). The first bend (C1) and the third bend (C3) can be understood as parts formed in a rounded manner at both end regions of the first center gear tooth surface (CF1). In this way, by placing bends (e.g., the first bend (C1) and the third bend (C3)) at both end regions of the first center gear tooth surface (CF1), stress accumulation on the first peripheral gear tooth surface (PF1) can be effectively prevented or relieved. The third bend (C3) may be placed on each of the first center gear tooth surfaces (CF1) constituting both sides of the first center gear tooth (4212). The third bend (C3) may be referred to as a "bend," a "curved surface," and / or a "bend surface."

[0211] According to one embodiment, the first peripheral gear tooth surface (PF1) may include a fourth bend (C4). The fourth bend (C4) may be formed in the opposite end region of the end region where the second bend (C2) is formed. For example, the fourth bend (C4) may be formed in the third end region (EA3) and may be bent so that the thickness of the first peripheral gear tooth (4222) decreases as it moves away from the motor (410). For example, the fourth bend (C4) may be positioned in the end region of the first direction (+X direction) of the first peripheral gear tooth surface (PF1). The fourth bend (C4) may be bent so that the thickness of the first peripheral gear tooth (4222) decreases as it moves in the first direction (+X direction). The second bend (C2) and the fourth bend (C4) may be understood as parts formed roundly in the end regions of both sides of the first peripheral gear tooth surface (PF1). In this way, by placing bends (e.g., a second bend (C2) and a fourth bend (C4)) at both end regions of the first peripheral gear tooth surface (PF1), stress accumulation on the first central gear tooth surface (CF1) can be effectively prevented or relieved. The fourth bend (C4) may be placed on each of the first peripheral gear tooth surfaces (PF1) constituting both sides of the first peripheral gear tooth (4222). The fourth bend (C4) may be referred to as a "bend," a "curved surface," and / or a "curved surface."

[0212] According to one embodiment, the second center gear tooth surface (CF2) may include a seventh bend (C7). The seventh bend (C7) may be formed in the end region opposite to the end region where the fifth bend (C5) is formed. For example, the seventh bend (C7) may be formed in the sixth end region (EA6) and may be bent so that the tooth thickness of the second center gear tooth (4242) decreases as it moves toward the motor (410). For example, the seventh bend (C7) may be placed in the end region on the second direction (-X direction) side of the second center gear tooth surface (CF2). The seventh bend (C7) may be bent so that the tooth thickness of the second center gear tooth (4242) decreases as it moves toward the second direction (-X direction). The fifth bend (C5) and the seventh bend (C7) can be understood as parts formed in a rounded manner at both end regions of the second center gear tooth surface (CF2). In this way, by placing bends (e.g., the fifth bend (C5) and the seventh bend (C7)) at both end regions of the second center gear tooth surface (CF2), stress accumulation on the second peripheral gear tooth surface (PF2) can be effectively prevented or relieved. The seventh bend (C7) may be placed on each of the second center gear tooth surfaces (CF2) constituting both sides of the second center gear tooth (4242). The seventh bend (C7) may be referred to as a "bend," a "curved surface," and / or a "curved surface."

[0213] According to one embodiment, the second peripheral gear tooth surface (PF2) may include an eighth bend (C8). The eighth bend (C8) may be formed in the opposite end region of the end region where the sixth bend (C6) is formed. For example, the eighth bend (C8) may be formed in the seventh end region (EA7) and may be bent so that the tooth thickness of the second peripheral gear tooth (4252) decreases as it moves away from the motor (410). For example, the eighth bend (C8) may be positioned in the first direction (+X direction) side end region of the second peripheral gear tooth surface (PF2). The eighth bend (C8) may be bent so that the tooth thickness of the second peripheral gear tooth (4252) decreases as it moves in the first direction (+X direction). The sixth bend (C6) and the eighth bend (C8) may be understood as parts formed roundly in both end regions of the second peripheral gear tooth surface (PF2). In this way, by placing bends (e.g., the sixth bend (C6) and the eighth bend (C8)) at both end regions of the second peripheral gear tooth surface (PF2), stress accumulation on the second central gear tooth surface (CF2) can be effectively prevented or relieved. The eighth bend (C8) may be placed on each of the second peripheral gear tooth surfaces (PF2) constituting both sides of the second peripheral gear tooth (4252). The eighth bend (C8) may be referred to as a "bend," a "curved surface," and / or a "curved surface."

[0214] According to one embodiment, the third bend (C3), the fourth bend (C4), the seventh bend (C7), and / or the eighth bend (C8) may be formed either essentially or optionally. For example, as shown in FIGS. 19 and 20, the third bend (C3) may be formed on the first center gear (421) and the seventh bend (C7) may be formed on the second center gear (424), but the fourth bend (C4) may not be formed on the first peripheral gear (422) and the eighth bend (C8) may not be formed on the second peripheral gear (425). For example, as shown in FIGS. 21 and 22, a fourth bend (C4) may be formed in the first peripheral gear (422) and an eighth bend (C8) may be formed in the second peripheral gear (425), but a third bend (C3) may not be formed in the first center gear (421) and a seventh bend (C7) may not be formed in the second center gear (424). For example, as shown in FIGS. 23 and 24, a third bend (C3) may be formed in the first center gear (421), a fourth bend (C4) may be formed in the first peripheral gear (422), a seventh bend (C7) may be formed in the second center gear (424), and an eighth bend (C8) may be formed in the second peripheral gear (425).

[0215] FIG. 25 is an exploded view of an electronic device according to one embodiment of the present disclosure.

[0216] Specifically, FIG. 25 illustrates a foldable electronic device, showing a flexible display (520) separated from a housing (510).

[0217] According to one embodiment, the electronic device (500) may be a foldable electronic device configured such that a first housing portion (501) and a second housing portion (502) rotate around a folding axis (F).

[0218] According to one embodiment, the electronic device (500) may include a first housing portion (501) and a second housing portion (502). The first housing portion (501) and the second housing portion (502) may be components of a "housing (510)" and / or a "foldable housing (510)". For example, the housing (510) may include the first housing portion (501) and the second housing portion (502).

[0219] According to one embodiment, the second housing portion (502) may be movably connected to the first housing portion (501). For example, the second housing portion (502) may be rotatably connected to the first housing portion (501). The second housing portion (502) may be rotatably configured to the first housing portion (501) around a folding axis (F).

[0220] According to one embodiment, the electronic device (500) may include a flexible display (520). The flexible display (520) may be disposed in a first housing portion (501) and a second housing portion (502). For example, the flexible display (520) may be disposed on the first housing portion (501) and the second housing portion (502).

[0221] According to one embodiment, the flexible display (520) may be configured to change shape or size as the second housing portion (502) moves relative to the first housing portion (501). For example, when the electronic device (500) is in an unfolded state (e.g., the state of FIG. 25), the flexible display (520) may be in an unfolded state. For example, when the electronic device (500) is in a folded state (not shown) (e.g., in the state of FIG. 25, the second housing portion (502) rotates about the folding axis (F) relative to the first housing portion (501) so that the first housing portion (501) and the second housing portion (502) are stacked), the flexible display (520) may be bent and folded together with the first housing portion (501) and / or the second housing portion (502).

[0222] According to one embodiment, the electronic device (500) may include a hinge assembly (530). The hinge assembly (530) may be positioned between a first housing portion (501) and a second housing portion (502). For example, the hinge assembly (530) may be positioned in a folding area (FA). The hinge assembly (530) may rotatably connect the first housing portion (501) and the second housing portion (502) around a folding axis (F). The hinge assembly (530) may provide a space in which a driving assembly (540) can be accommodated.

[0223] According to one embodiment, the electronic device (500) may include a driving assembly (540). The driving assembly (540) may be placed in a folding area (FA) where a hinge assembly (530) is placed. The driving assembly (540) may be placed in a space provided in the hinge assembly (530). The driving assembly (540) may be configured to provide power to move the second housing portion (502) relative to the first housing portion (501).

[0224] According to one embodiment, the drive assembly (540) may be disposed in at least one of the first housing portion (501) or the second housing portion (502). For example, the drive assembly (540) may be disposed in each of the first housing portion (501) and the second housing portion (502).

[0225] According to one embodiment, the drive assembly (540) may include a first drive assembly (540a). The first drive assembly (540a) may be placed in the first housing portion (501). According to one embodiment, the drive assembly (540) may include a second drive assembly (540b). The second drive assembly (540b) may be placed in the second housing portion (502). The first drive assembly (540a) and the second drive assembly (540b) may each be placed on one side and the other side of the folding axis (F). The first drive assembly (540a) and the second drive assembly (540b) may each be referred to as "drive assembly." The first drive assembly (540a) and the second drive assembly (540b) may have a structure that is symmetrical to each other with respect to the folding axis (F).

[0226] According to one embodiment, the drive assembly (540) may include a motor (541), a reduction gear assembly (542), and a drive gear (543). The detailed configuration of the motor (541) may be the same or similar as the detailed configuration of the actuator (240a) described in relation to FIGS. 4 through 7 and / or the detailed configuration of the motor (310) described in relation to FIG. 8. The detailed configuration of the reduction gear assembly (542) may be the same or similar as the detailed configuration of the reduction gear assembly (240b) described in relation to FIGS. 4 through 7, the reduction gear assembly (320) described in relation to FIGS. 8 through 18 and / or the reduction gear assembly (420) described in relation to FIGS. 19 through 24. The detailed configuration of the drive gear (543) may be the same or similar as the detailed configuration of the drive gear (240c) described in relation to FIGS. 4 to 7 and / or the drive gear (330) described in relation to FIG. 8.

[0227] According to one embodiment, the hinge assembly (530) may include a rack gear (531). The rack gear (531) may include a first rack gear (531a) and a second rack gear (531b). The first rack gear (531a) may mesh with the first drive gear (543a) of the first drive assembly (540a). The second rack gear (531b) may mesh with the second drive gear (543b) of the second drive assembly (540b). The rack gear (531) can transmit power generated in the drive assembly (540) to the first housing portion (501) and / or the second housing portion (502). For example, when the drive assembly (540) is operated, the rotational force of the drive assembly (540) is transmitted to the rack gear (531), and the force transmitted to the rack gear (531) may cause rotation about the folding axis (F) of the first housing part (501) and / or the second housing part (502). For example, the rack gear (531) may be a part of the housing (510). For example, the first rack gear (531a) may be a part of the first housing part (501), and the second rack gear (531b) may be a part of the second housing part (502). For example, the rack gear (531) may be a component of the drive assembly (540). For example, the drive assembly (540) may include the rack gear (531).

[0228] In one embodiment (not shown), only one drive assembly (540) may be provided. For example, the drive assembly (540) may be placed in the first housing portion (501) or the second housing portion (502). For example, the drive assembly (540) may be placed between the first housing portion (501) and the second housing portion (502). The drive assembly (540) may provide a driving force that enables the other to move relative to either the first housing portion (501) or the second housing portion (502).

[0229] The electronic device includes a movably configured housing and a drive assembly that moves the housing. The configuration assembly includes a motor and a reduction gear assembly that transmits power generated by the motor. The reduction gear assembly is composed of planetary gears capable of reducing the rotational speed generated by the motor and increasing the torque generated by the motor to transmit to the pinion gear. Conventionally, a two-stage reduction gear assembly has been introduced to effectively reduce rotational speed and effectively increase torque.

[0230] However, in conventional reduction gear assemblies, eccentricity occurred between the center gear (e.g., sun gear) and the peripheral gear (e.g., planet gear) due to the tolerance between them, and there was a problem where stress was concentrated on the teeth of the center gear and the teeth of the peripheral gear due to this eccentricity.

[0231] In addition, conventional reduction gear assemblies suffered from noise generation and reduced operational stability and efficiency due to tooth deformation, breakage, and / or wear caused by stress concentration between the center gear and surrounding gears.

[0232] In addition, conventional reduction gear assemblies have tooth widths that correspond to each other for the first and second planetary gears, so the reduction gear assembly occupies a large space within the housing, which causes a problem of reduced space efficiency of the housing.

[0233] The problem to be solved in the present disclosure is to prevent or alleviate stress concentration caused by tolerances of the gears constituting a reduction gear assembly.

[0234] The problem to be solved in the present disclosure is to prevent or mitigate noise and improve the operational stability and / or efficiency of the reduction gear assembly by suppressing deformation and / or wear of the teeth constituting the reduction gear assembly.

[0235] The problem to be solved in the present disclosure is to improve the space efficiency of the housing by optimizing the size of the reduction gear assembly.

[0236] The problems to be solved in this disclosure are not limited to those mentioned above, and may be determined in various ways without departing from the spirit and scope of this disclosure.

[0237] An electronic device according to various embodiments of the present disclosure can prevent or alleviate stress concentration acting between gears constituting a reduction gear assembly.

[0238] An electronic device according to various embodiments of the present disclosure can prevent or mitigate noise and improve the operational stability and / or efficiency of a reduction gear assembly by suppressing deformation and / or wear of the teeth constituting the reduction gear assembly.

[0239] An electronic device according to various embodiments of the present disclosure can improve the space efficiency of the housing by optimizing the size of the reduction gear assembly.

[0240] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0241] A drive assembly according to one embodiment of the present disclosure may be a drive assembly accommodated in an electronic device. The drive assembly may include: a motor comprising a shaft configured to generate rotational force and configured to rotate along a rotation axis; and a reduction gear assembly connected to the motor. The reduction gear assembly may include: a first center gear comprising a first center gear tooth and connected to the shaft; a first peripheral gear comprising a first peripheral gear tooth that meshes with the first center gear tooth; and a ring gear formed in a ring shape around the rotation axis, surrounding the first peripheral gear and meshing with the first peripheral gear. The tooth surface of the first center gear may include a first end region which is an end region of the tooth surface of the first center gear in the direction of the rotation axis, and a curved surface is formed in the first end region in a direction in which the tooth thickness of the first center gear tooth decreases.

[0242] The thickness of the first center gear may decrease along an axis passing through the center of the first center gear. The first center gear tooth may include a first center gear tooth end located far from the center of the first center gear, and the thickness of the first center gear tooth may decrease as it approaches the first center gear tooth end. The rate of change of the thickness of the first center gear tooth with respect to the rotational direction of the first center gear may increase as it approaches the first center gear tooth end.

[0243] A drive assembly according to one embodiment of the present disclosure may be a drive assembly housed in an electronic device. The drive assembly may include: a motor comprising a shaft configured to generate rotational force and configured to rotate along a rotation axis; and a reduction gear assembly connected to the motor. The reduction gear assembly may include: a first center gear connected to the shaft and comprising a first center gear tooth; a first peripheral gear comprising a first peripheral gear tooth that engages with the first center gear tooth; and a ring gear formed in a ring shape around the rotation axis, surrounding the first peripheral gear, and engaging with the first peripheral gear. The tooth surface of the first peripheral gear may include a fourth end region corresponding to a second end region, which is one end region of the tooth surface of the first peripheral gear, and a curved surface is formed in the fourth end region in a direction in which the tooth thickness of the first peripheral gear tooth surface decreases.

[0244] The thickness of the first peripheral gear tooth may decrease along an axis passing through the center of the first peripheral gear. The first peripheral gear tooth may include a first peripheral gear tooth end located far from the center of the first peripheral gear, and the thickness of the first peripheral gear tooth may decrease as it approaches the first peripheral gear tooth end. The rate of change of the thickness of the first peripheral gear tooth with respect to the rotational direction of the first peripheral gear may increase as it approaches the first peripheral gear tooth end.

[0245] A drive assembly according to one embodiment of the present disclosure may be a drive assembly that is housed in an electronic device. The drive assembly may include: a motor comprising a shaft configured to generate rotational force and configured to rotate along a rotation axis; and a reduction gear assembly connected to the motor. The reduction gear assembly may include: a first center gear connected to the shaft and comprising a first center gear tooth; a first peripheral gear comprising a first peripheral gear tooth that engages with the first center gear tooth; and a ring gear formed in a ring shape around the rotation axis, surrounding the first peripheral gear, and engaging with the first peripheral gear. The first center gear tooth comprises a first center gear end positioned far from the center of the first center gear, and the thickness of the first center gear tooth with respect to the rotational direction of the first center gear may decrease as it approaches the first center gear tooth end. The first center gear tooth includes at least one curved surface, so that the rate of change of the thickness of the first center gear tooth with respect to the rotational direction of the first center gear can increase as it approaches the end of the first center gear tooth.

[0246] The first central gear tooth includes a first central gear tooth end located further from the center of the first central gear, and the thickness of the first central gear tooth with respect to the rotational direction of the first central gear may decrease as it approaches the first central gear tooth end. By including at least one curved surface, the rate of change of the thickness of the first central gear tooth with respect to the rotational direction of the first central gear may increase as it approaches the first central gear tooth end. The first peripheral gear tooth includes a first peripheral gear tooth end located further from the center of the first peripheral gear, and the thickness of the first peripheral gear tooth with respect to the rotational direction of the first peripheral gear may increase as it approaches the first peripheral gear tooth end. By including at least one curved surface, the rate of change of the thickness of the first peripheral gear tooth with respect to the rotational direction of the first peripheral gear may increase as it approaches the first peripheral gear tooth end.

[0247] A drive assembly according to one embodiment of the present disclosure may be a drive assembly accommodated in an electronic device. The drive assembly may include: a motor comprising a shaft configured to generate rotational force and configured to rotate along a rotation axis; and a reduction gear assembly connected to the motor. The reduction gear assembly may include: a first center gear connected to the shaft and comprising a first center gear tooth; a first peripheral gear comprising a first peripheral gear tooth that engages with the first center gear tooth; and a ring gear formed in a ring shape around the rotation axis, surrounding the first peripheral gear, and engaging with the first peripheral gear. The first central gear tooth includes a first central gear tooth end positioned far from the center of the first central gear, and the thickness of the first central gear tooth with respect to the rotational direction of the first central gear may decrease as it approaches the first central gear tooth end. The first peripheral gear tooth includes a first peripheral gear tooth end positioned far from the center of the first peripheral gear, and the thickness of the first peripheral gear tooth with respect to the rotational direction of the first peripheral gear may decrease as it approaches the first peripheral gear tooth end. By including at least one curved surface, the rate of change of the thickness of the first central gear tooth with respect to the rotational direction of the first central gear may increase as it approaches the first central gear tooth end. Additionally or generally, the first peripheral gear tooth comprises at least one curved surface, so that the rate of change of the thickness of the first peripheral gear tooth with respect to the rotational direction of the first peripheral gear may increase toward the end of the first peripheral gear tooth.

[0248] A driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be a driving assembly (240; 301; 401; 540) accommodated in an electronic device (300; 400; 500).

[0249] A driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a motor (310; 410; 541) comprising a shaft (311; 411) that rotates along a rotation axis (Ax) and is configured to generate rotational force.

[0250] A driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a reduction gear assembly (320; 420; 542) connected to the motor.

[0251] A drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a drive gear (330; 543) connected to the reduction gear assembly.

[0252] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a first center gear (321; 421) connected to the shaft and including a first center gear tooth (3212; 4212).

[0253] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a first peripheral gear (322; 422) comprising a first peripheral gear tooth (3222; 4222) that meshes with the first central gear tooth.

[0254] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a ring gear (327) formed in a ring shape around the rotation axis to surround the first peripheral gear and meshing with the first peripheral gear.

[0255] The tooth surface (CF1) of the first center gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure includes a first end region (EA1) and a second end region (EA2), which are end regions in the direction of the rotation axis of the tooth surface of the first center gear, and the first end region may have a curvature formed in a direction in which the tooth thickness (TT1) of the first center gear tooth decreases.

[0256] The tooth surface (PF1) of the first peripheral gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure includes a third end region (EA3) corresponding to the first end region and a fourth end region (EA4) corresponding to the second end region, and the fourth end region may have a curvature formed in a direction in which the tooth thickness (TT2) of the first peripheral gear tooth decreases.

[0257] The first end region (EA1) of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be an end region far from the motor among the tooth surfaces of the first center gear.

[0258] The tooth surface of the first center gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a first curved portion (C1) formed in the first end portion and curved such that the thickness of the tooth of the first center gear tooth decreases as it moves away from the motor.

[0259] The tooth surface of the first peripheral gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may include a second curved portion (C2) formed in the fourth end portion and curved such that the thickness of the tooth of the first peripheral gear tooth decreases as it moves toward the motor.

[0260] The tooth surface of the first center gear (421) of the drive assembly (401) according to one embodiment of the present disclosure may further include a third curved portion (C3) formed in the second end portion and curved such that the thickness of the tooth of the first center gear tooth decreases as it moves toward the motor (410).

[0261] The tooth surface of the first peripheral gear (422) of the drive assembly (401) according to one embodiment of the present disclosure may further include a fourth curved portion (C4) formed in the third end region and curved such that the thickness of the tooth of the first peripheral gear tooth decreases as it moves away from the motor (410).

[0262] The first bend of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be configured to overlap radially with the end of the first peripheral gear far from the motor and the rotation axis when the first peripheral gear moves as far as possible toward the motor.

[0263] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may further include a first carrier (323; 423) connected to the center of the first peripheral gear and configured to rotate around the rotation axis.

[0264] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure is configured to rotate about the rotation axis together with the first carrier and may further include a second center gear (324; 424) including a second center gear tooth (3242; 4242).

[0265] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may further include a second peripheral gear (325; 425) comprising a second peripheral gear tooth (3252; 4252) that meshes with the second central gear tooth.

[0266] The first tooth width (Fw1) of the first center gear and the second tooth width (Fw2) of the second center gear of the driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be different from each other.

[0267] The third tooth width (Fw3) of the first peripheral gear and the fourth tooth width (Fw4) of the second peripheral gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be different from each other.

[0268] The first tooth width of the driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be smaller than the second tooth width.

[0269] The third tooth width of the driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be smaller than the fourth tooth width.

[0270] The first center gear and the first peripheral gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may have a first reduction ratio (R1).

[0271] The second tooth width of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be smaller than the product of the first tooth width and the first reduction ratio.

[0272] The fourth tooth width of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be smaller than the product of the third tooth width and the first reduction ratio.

[0273] The ratio of the first tooth width to the second tooth width of the driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be substantially the same as the ratio of the third tooth width to the fourth tooth width.

[0274] The tooth surface (CF2) of the second center gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure includes a fifth end region (EA5) which is an end far from the motor in the direction of the rotation axis of the tooth surface of the second center gear and a sixth end region (EA6) which is an end close to the motor, and may include a fifth bend (C5) formed in the fifth end region and bent such that the thickness of the tooth of the second center gear decreases as it moves away from the motor.

[0275] The tooth surface (PF2) of the second peripheral gear of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure includes a seventh end region (EA7) corresponding to the fifth end region of the tooth surface of the second peripheral gear and an eighth end region (EA8) corresponding to the sixth end region, and may include a sixth bend (C6) formed in the eighth end region and bent such that the thickness of the tooth of the second peripheral gear tooth decreases as it goes toward the motor.

[0276] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may further include a second carrier (326) connected to the center of the second peripheral gear and rotating about the rotation axis.

[0277] The reduction gear assembly of the drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may further include a center shaft (328) that is configured to extend along the rotation axis and pass through the shaft, the first center gear, the first carrier, and the second center gear, and is fixed to the second carrier.

[0278] The center shaft of a drive assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be configured to rotate at the same angular velocity as the second carrier and to rotate at an angular velocity different from that of the shaft, the first center gear, the first carrier, and the second center gear.

[0279] The driving gear of the driving assembly (240; 301; 401; 540) according to one embodiment of the present disclosure may be a pinion gear capable of operating in mesh with a rack gear (240d).

[0280] An electronic device according to one embodiment of the present disclosure may include one or more driving assemblies as described above.

[0281] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a housing (210; 510) comprising a first housing portion (201; 501) and a second housing portion (202; 502) movably connected to the first housing portion.

[0282] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a flexible display (203; 520) disposed in the first housing portion and the second housing portion, configured such that at least one of the shape or size changes as the second housing portion moves relative to the first housing portion.

[0283] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a driving assembly (240; 301; 401; 540) disposed in at least one of the first housing portion or the second housing portion and configured to provide power to move the second housing portion relative to the first housing portion.

[0284] The driving assembly (240; 301; 401; 540) of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a motor (310; 410; 541) comprising a shaft (311; 411) that rotates along a rotation axis (Ax) and is configured to generate rotational force.

[0285] The driving assembly (240; 301; 401; 540) of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a reduction gear assembly (320; 420; 542) connected to the motor.

[0286] The driving assembly (240; 301; 401; 540) of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a driving gear (330; 543) connected to the reduction gear assembly.

[0287] The reduction gear assembly of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first center gear (321; 421) connected to the shaft and including a first center gear tooth (3212; 4212).

[0288] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first peripheral gear (322; 422) comprising a first peripheral gear tooth (3222; 4222) that meshes with the first central gear tooth.

[0289] The reduction gear assembly of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a ring gear (327) that meshes with the first peripheral gear.

[0290] The tooth surface (CF1) of the first center gear of the electronic device (300; 400; 500) according to one embodiment of the present disclosure includes a first end region (EA1) and a second end region (EA2), which are end regions in the direction of the rotation axis of the tooth surface of the first center gear, and the first end region may have a curvature formed in a direction in which the tooth thickness (TT1) of the first center gear tooth decreases.

[0291] The tooth surface (PF1) of the first peripheral gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure includes a third end region (EA3) corresponding to the first end region and a fourth end region (EA4) corresponding to the second end region, and the fourth end region may have a curvature formed in a direction in which the tooth thickness (TT2) of the first peripheral gear tooth decreases.

[0292] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a housing (210; 510) comprising a first housing portion (201; 501) and a second housing portion (202; 502) movably connected to the first housing portion.

[0293] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a flexible display (203; 520) disposed in the first housing portion and the second housing portion, configured such that at least one of the shape or size changes as the second housing portion moves relative to the first housing portion.

[0294] An electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a driving assembly (240; 301; 401; 540) disposed in at least one of the first housing portion or the second housing portion and configured to provide power to move the second housing portion relative to the first housing portion.

[0295] The driving assembly (240; 301; 401; 540) of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a motor (310; 410; 541) comprising a shaft (311; 411) that rotates along a rotation axis (Ax) and is configured to generate rotational force.

[0296] The driving assembly (240; 301; 401; 540) of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a reduction gear assembly (320; 420; 542) connected to the motor.

[0297] The driving assembly (240; 301; 401; 540) of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a driving gear (330; 543) connected to the reduction gear assembly.

[0298] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first center gear (321; 421) connected to the shaft.

[0299] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first peripheral gear (322; 422) that meshes with the first center gear.

[0300] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first carrier (323; 423) connected to the center of the first peripheral gear and rotating about the rotation axis.

[0301] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a second center gear (324; 424) configured to rotate around the rotation axis together with the first carrier.

[0302] The reduction gear assembly of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a second peripheral gear (325; 425) that meshes with the second center gear.

[0303] The reduction gear assembly of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a ring gear (327) formed in a ring shape centered on the rotation axis to surround the first peripheral gear and the second peripheral gear, and meshing with the first peripheral gear and the second peripheral gear.

[0304] The first tooth width (Fw1) of the first center gear and the second tooth width (Fw2) of the second center gear of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be different from each other.

[0305] The third tooth width (Fw3) of the first peripheral gear and the fourth tooth width (Fw4) of the second peripheral gear of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be different from each other.

[0306] The first tooth width of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be smaller than the second tooth width.

[0307] The third tooth width of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be smaller than the fourth tooth width.

[0308] The first center gear and the second peripheral gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may have a first reduction ratio (R1).

[0309] The second tooth width of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be smaller than the product of the first tooth width and the first reduction ratio.

[0310] The fourth tooth width of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be smaller than the product of the third tooth width and the first reduction ratio.

[0311] The first center gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first center gear tooth (3212; 4212).

[0312] The first peripheral gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first peripheral gear tooth (3222; 4222) that meshes with the first central gear tooth.

[0313] The tooth surface (CF1) of the first center gear of the electronic device (300; 400; 500) according to one embodiment of the present disclosure includes a first end region (EA1) and a second end region (EA2), which are end regions in the direction of the rotation axis of the tooth surface of the first center gear, and the first end region may have a curvature formed in a direction in which the tooth thickness (TT1) of the first center gear tooth decreases.

[0314] The tooth surface (PF1) of the first peripheral gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure includes a third end region (EA3) corresponding to the first end region and a fourth end region (EA4) corresponding to the second end region, and the fourth end region may have a curvature formed in a direction in which the tooth thickness (TT2) of the first peripheral gear tooth decreases.

[0315] The first end region of the electronic device (300; 400; 500) according to one embodiment of the present disclosure may be an end region of the tooth surface of the first center gear that is far from the motor.

[0316] The tooth surface of the first center gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may include a first curved portion (C1) formed in the first end portion and curved such that the thickness of the tooth of the first center gear tooth decreases as it moves away from the motor.

[0317] The tooth surface of the first peripheral gear of an electronic device (300; 400; 500) according to one embodiment of the present disclosure may be formed in the fourth end region and may include a second curved portion (C2) that is curved so that the thickness of the tooth of the first peripheral gear tooth decreases as it moves toward the motor.

[0318] A drive assembly according to one embodiment of the present disclosure may include: a motor comprising a shaft configured to generate rotational force and configured to rotate along a rotation axis; a reduction gear assembly connected to the motor; and a drive gear connected to the reduction gear assembly. The reduction gear assembly may include: a first center gear connected to the shaft; a first peripheral gear engaged with the first center gear; a first carrier connected to the center of the first peripheral gear and configured to rotate around the rotation axis; a second center gear configured to rotate around the rotation axis together with the first carrier; a second peripheral gear engaged with the second center gear; and a ring gear formed in a ring shape around the rotation axis, surrounding the first peripheral gear and the second peripheral gear, and engaged with the first peripheral gear and the second peripheral gear. In these embodiments, the first tooth width of the first center gear and the second tooth width of the second center gear may be different from each other, and additionally or generally, the third tooth width of the first peripheral gear and the fourth tooth width of the second peripheral gear may be different from each other.

[0319] Although specific embodiments have been described in the detailed description of the present disclosure, it will be obvious to those skilled in the art that various modifications are possible within the scope of the present disclosure.

[0320] Although the present disclosure has been described by way of example with respect to one embodiment, it should be understood that the embodiment is for illustrative purposes only and is not intended to limit the present disclosure. It will be obvious to those skilled in the art that various changes in form and detailed configuration may be made without departing from the whole context of the present disclosure, including the appended claims and their equivalents.

[0321] The electronic device according to the various embodiments disclosed in this disclosure may be a device of various forms. The electronic device may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a consumer electronics device. The electronic device according to the embodiments of this disclosure is not limited to the devices described above.

[0322] The various embodiments of the present disclosure and the terms used therein are not intended to limit the technical features described in the present disclosure to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said 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 said items unless the relevant context clearly indicates otherwise. In the present disclosure, each of phrases such as “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” may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish a component from another component and do not limit the components in any other aspect (e.g., importance or order). Where any (e.g., first) component is referred to as “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicationally,” it means that said component may be connected to said other component directly (e.g., wired), wirelessly, or through a third component.

[0323] The term “module” as used in various embodiments of the present disclosure 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, for example. A module may be a component formed integrally, or a minimum unit of said component or a part thereof 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).

[0324] Various embodiments of the present disclosure may be implemented as software (e.g., program (140)) comprising one or more instructions stored in a storage medium (e.g., internal memory (136) or external memory (138)) readable by a machine (e.g., electronic device (101)). For example, a processor (e.g., processor (120)) of the machine (e.g., electronic device (101)) may call at least one of the one or more instructions stored in the storage medium and execute it. This enables the machine to be operated 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 that can be executed by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' simply means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily.

[0325] According to one embodiment, the method according to the various embodiments disclosed herein may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer 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 distributed online (e.g., download or upload) through 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 created in a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0326] According to various embodiments, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by the module, program, or other components 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.

[0327] It will be understood that all embodiments and technical features described above may be combined with one another in any combination, provided there is no conflict between the two embodiments or features. That is, any combination of any two or more embodiments described above is conceived and included in this disclosure. One or more features of any embodiment may be incorporated into another embodiment and may provide corresponding advantages or benefits.

Claims

1. In a driving assembly (240; 301; 401; 540) accommodated in an electronic device (300; 400; 500), A motor (310; 410; 541) comprising a shaft (311; 411) configured to generate rotational force and rotating along a rotation axis (Ax); A reduction gear assembly (320; 420; 542) connected to the motor; and It includes a drive gear (330; 543) connected to the above reduction gear assembly, and The above reduction gear assembly is: A first center gear (321; 421) connected to the shaft and including a first center gear tooth (3212; 4212); A first peripheral gear (322; 422) comprising a first peripheral gear tooth (3222; 4222) that meshes with the first central gear tooth; and It includes a ring gear (327) formed in a ring shape around the rotation axis to surround the first peripheral gear and meshing with the first peripheral gear. The tooth surface (CF1) of the first center gear comprises a first end region (EA1) and a second end region (EA2), which are end regions in the direction of the rotation axis of the tooth surface of the first center gear, and the first end region has a curvature formed in a direction in which the tooth thickness (TT1) of the first center gear tooth decreases. The tooth surface (PF1) of the first peripheral gear includes a third end region (EA3) corresponding to the first end region and a fourth end region (EA4) corresponding to the second end region, and the fourth end region has a bend formed in a direction in which the tooth thickness (TT2) of the first peripheral gear tooth decreases, in a driving assembly (240; 301; 401; 540).

2. In Paragraph 1, The first end region (EA1) is the end region far from the motor among the tooth surfaces of the first center gear, and The tooth surface of the first center gear is formed in the first end region and includes a first curved portion (C1) that is curved so that the thickness of the tooth of the first center gear tooth decreases as it moves away from the motor. A drive assembly (240; 301; 401; 540) wherein the tooth surface of the first peripheral gear is formed in the fourth end region and includes a second curved portion (C2) that is curved such that the thickness of the tooth of the first peripheral gear tooth decreases as it moves toward the motor.

3. In Paragraph 2, A drive assembly (401) further comprising a third curved portion (C3) formed in the second end portion of the tooth surface of the first center gear (421) such that the thickness of the tooth of the first center gear tooth decreases as it moves toward the motor (410).

4. In Paragraph 2 or 3, A drive assembly (401) further comprising a fourth bend (C4) formed in the third end region of the tooth surface of the first peripheral gear (422) and bent such that the thickness of the tooth of the first peripheral gear tooth decreases as it moves away from the motor (410).

5. In any one of paragraphs 2 through 4, The first bend is a drive assembly (240; 301; 401; 540) configured to overlap radially with the end of the first peripheral gear far from the motor and the rotation axis when the first peripheral gear moves as far as possible toward the motor.

6. In any one of paragraphs 1 through 5, The above reduction gear assembly is: A first carrier (323; 423) connected to the center of the first peripheral gear and configured to rotate around the rotation axis; A second center gear (324; 424) configured to rotate about the rotation axis together with the first carrier and including a second center gear tooth (3242; 4242); and A drive assembly (240; 301; 401; 540) further comprising a second peripheral gear (325; 425) including a second peripheral gear tooth (3252; 4252) that meshes with the second central gear tooth.

7. In Paragraph 6, The first tooth width (Fw1) of the first center gear and the second tooth width (Fw2) of the second center gear are different from each other, The third tooth width (Fw3) of the first peripheral gear and the fourth tooth width (Fw4) of the second peripheral gear are different from each other in the drive assembly (240; 301; 401; 540).

8. In Paragraph 7, The first tooth width is smaller than the second tooth width, and The above third tooth width is a driving assembly (240; 301; 401; 540) smaller than the above fourth tooth width.

9. In Paragraph 7 or 8, The first center gear and the first peripheral gear have a first reduction ratio (R1), The second tooth width is smaller than the product of the first tooth width and the first reduction ratio, and The above fourth tooth width is smaller than the product of the above third tooth width and the above first reduction ratio in the drive assembly (240; 301; 401; 540).

10. In any one of paragraphs 7 through 9, The ratio of the first tooth width to the second tooth width is substantially the same as the ratio of the third tooth width to the fourth tooth width in a driving assembly (240; 301; 401; 540).

11. In any one of paragraphs 6 through 10, The tooth surface (CF2) of the second center gear comprises a fifth end region (EA5) which is an end far from the motor in the direction of the rotational axis of the tooth surface of the second center gear and a sixth end region (EA6) which is an end close to the motor, and includes a fifth bend (C5) formed in the fifth end region and bent such that the thickness of the tooth of the second center gear decreases as it moves away from the motor. The tooth surface (PF2) of the second peripheral gear comprises a seventh end region (EA7) corresponding to the fifth end region of the tooth surface of the second peripheral gear and an eighth end region (EA8) corresponding to the sixth end region, and a drive assembly (240; 301; 401; 540) comprising a sixth bend (C6) formed in the eighth end region and bent such that the thickness of the tooth of the second peripheral gear tooth decreases as it moves toward the motor.

12. In any one of paragraphs 6 through 11, The above reduction gear assembly is: A second carrier (326) connected to the center of the second peripheral gear and rotating around the rotation axis; and A drive assembly (240; 301; 401; 540) further comprising a center shaft (328) that extends along the rotation axis and is configured to pass through the shaft, the first center gear, the first carrier, and the second center gear, and is fixed to the second carrier.

13. In Paragraph 12, The center shaft is configured to rotate at the same angular velocity as the second carrier and to rotate at an angular velocity different from that of the shaft, the first center gear, the first carrier, and the second center gear, in a drive assembly (240; 301; 401; 540).

14. In any one of paragraphs 1 through 13, The above drive gear is a drive assembly (240; 301; 401; 540) which is a pinion gear capable of operating in mesh with a rack gear (240d).

15. An electronic device (300; 400; 500) comprising the driving assembly (240; 301; 401; 540) according to any one of claims 1 to 14, A housing (210; 510) comprising a first housing portion (201; 501) and a second housing portion (202; 502) movably connected to the first housing portion; and A flexible display (203; 520) is disposed in the first housing portion and the second housing portion, and is configured such that at least one of the shape or size changes as the second housing portion moves relative to the first housing portion. The above driving assembly (240; 301; 401; 540) is disposed in at least one of the first housing portion or the second housing portion, and is configured to provide power to move the second housing portion relative to the first housing portion, an electronic device (300; 400; 500).

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