Patent Publication Number: US-2023134564-A1

Title: Foldable electronic device and method for operating the same

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a Bypass Continuation of International Patent Application No. PCT/KR2022/002825, filed on Feb. 25, 2022, which claims priority from and the benefit of Korean Patent Application No. 10-2021-0145823, filed on Oct. 28, 2021, which is hereby incorporated by reference for all purposes as if fully set forth herein. 
    
    
     BACKGROUND 
     Field 
     Illustrative embodiments of the invention relate generally to electronic devices, and more specifically, to a foldable electronic device and method for operating the same. 
     Discussion of the Background 
     Electronic devices typically require a small profile for portability and require a large display area to provide much information to a user. In order to make a small profile compatible with a large display area in an electronic device, various form factors as in a foldable electronic device equipped with a flexible display are being used in addition to the known elongated rectangular form factor. An electronic device having a foldable form factor may include a foldable housing configured to be folded or unfolded around at least one hinge part to fold or unfold a flexible display. For various uses of a foldable electronic device, a hinge part of a foldable housing may include a detent hinge or a free stop hinge that has resistance to rotation. 
     The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. 
     SUMMARY 
     Applicant recognized that when the foldable electronic devices are folded or unfolded by a user, the resistance of the hinge part may make it difficult and/or uncomfortable for the user to open (unfold). For example, when the foldable electronic device is unfolded, the foldable display may be pressed by the user&#39;s hand, resulting in permanent a dent or damage to the sensitive electronic panel of the foldable display. In addition, in order to open and use the foldable electronic device, it is necessary to separately perform the operation of unfolding the foldable electronic device and the operation of unlocking the foldable electronic device, which may reduce the user&#39;s convenience. Moreover, designing a hinge structure that facilitates opening and closing of a foldable display without requiring too much force or discomfort and which can be opened to any desired angle, but is not cumbersome and does not take up too much space is difficult to achieve, especially in electronic devices having smaller form factors, like mobile phones. 
     Foldable electronic devices constructed according to the principles and implementations of the invention allow the device to be unfolded and opened automatically only by one touch of a button without making it inconvenient or difficult for the user to open and close foldable part or adjust it to an arbitrary angle, while at the same time allowing adjustment to an arbitrary angle required by the user without consuming additional space, such as by designing the opening button to be used in common with other functions, (e.g., a power button). For example, embodiments of the foldable electronic device may include a biaser that drives a hinge based on the release of a stop interlocked with an actuator so that the foldable electronic device is automatically unfolded by pushing the actuator. Moreover, since the actuator may include an electrical switch, the foldable electronic device may perform not only a haptic operation but also an unlocking operation interlocked with the unfolding operation when the switch is pushed. 
     Foldable electronic devices constructed according to the principles and embodiments of the invention provide improved user operability and convenience during folding and unfolding operations, while avoiding risk of damage to the sensitive display and other components, which may be achieved in a compact electronic device, such as a mobile phone. 
     Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. 
     According to one aspect of the invention, a foldable electronic device includes a foldable enclosure including a plurality of sub-enclosures, a hinge coupled to ends of the plurality of sub-enclosures to interconnect the sub-enclosures and to allow the foldable enclosure to be folded or unfolded by rotation of the sub-enclosures, a biaser to apply a rotational force to the hinge in a direction that causes the foldable enclosure to be unfolded, a follower located inside any one of the sub-enclosures and supported for incremental movement during folding or unfolding of the foldable enclosure, a stop to selectively come into contact with or be separated from the follower to selectively restrict the movement of the follower, and an actuator to selectively control folding and unfolding of the foldable electronic device by selectively causing the stop to come into contact with or be separated from the follower. 
     At least one the following may apply: the foldable enclosure may include a foldable housing and the foldable sub-enclosures may include foldable sub-housings; the hinge may include a hinge part; the biaser may include an elastic member; the follower may include an interlocking part; the stop may include a motion restriction member; and the actuator may include a button part. The follower may include a ratchet wheel supported for rotation conjunction with the hinge and including a plurality of teeth, and the stop may include a ratchet pawl selectively engageable with the teeth of the ratchet wheel. 
     The follower may include a brake rotor supported for rotation with the hinge, and the stop may include a brake shoe selectively engageable against the brake rotor to restrict rotation of the brake rotor at an arbitrary rotation angle by friction. The brake shoe and the brake rotor may be slid relative to each other when an external force for folding or unfolding the foldable housing is applied in response to the actuator not being actuated, thereby allowing the foldable electronic device to be folded or unfolded. The brake rotor may have a truncated cone shape, and may include a brake drum having a first friction surface formed on a side surface of the truncated cone shape, and the brake shoe may include a second friction surface having a shape corresponding to the first friction surface. 
     The follower may include a movable member supported for incremental movement relative to the sub-enclosures in response to folding or unfolding of the foldable housing. The movable member may include a sliding member having a rack in which a plurality of teeth are arranged linearly, the follower may include a pinion gear engageable with the rack to rotate incrementally with a linear movement of the rack, and a brake rotor supported for rotation by being coupled to the pinion gear, and the stop may include a brake shoe selectively engageable against the brake rotor to restrict the rotation of the brake rotor at an arbitrary rotation angle by friction. 
     The movable member may include a sliding friction surface disposed parallel to the sliding direction, and the stop may include a linear brake configured to apply a frictional force to the sliding friction surface by being engaged against the sliding friction surface. The movable member may further include a first brake pad attached to the sliding friction surface, and the stop may further include a second brake pad attached to a surface of the linear brake facing the sliding friction surface. The movable member may further include a first irregularity formed on the sliding friction surface, and the stop may include a second irregularity formed on a surface of the linear brake facing the sliding friction surface. Frictional force between the follower and the stop may have a relatively large value with respect to a direction in which the movable member is supported for movement when the foldable enclosure is unfolded, and may have a relatively small value with respect a direction in which the movable member is supported for movement when the foldable enclosure is folded. The first irregularity and the second irregularity may include asymmetric irregularities that have a relatively steep slope with respect to a direction in which the movable member is supported for linear movement when the foldable enclosure is unfolded, and may have a relatively gentle slope with respect to a direction in which the movable member is supported for linear movement when the foldable housing is folded. 
     The movable member may further include a plurality of second sliding friction surfaces opposed to each other, and the stop may further include a clamp to apply a frictional force by holding the movable member on the plurality of second sliding friction surfaces. The foldable electronic device may further include a clamp housing including an inner space into which at least a portion of the clamp is inserted, wherein the clamp may include an inclined surface in contact with the inner surface of the inner space of the clamp housing, and the inclined surface may press the clamp against the second sliding friction surfaces by being moved while being in contact with the inner surface of the inner space of the clamp when the clamp is inserted into the clamp housing. The movable member may further include an expansion portion in which a thickness of the movable member is gradually increased, the clamp may further include a curved portion provided at a distal end facing the expansion portion, and when the clamp is moved toward the expansion portion, the curved portion may be moved along a surface of the expansion portion so that the clamp is spaced apart from the second sliding friction surfaces. 
     The actuator may include an electrical switch disposed thereon to generate an electrical signal when the actuator is operated. The foldable electronic device may include a sensor to detect the folding or unfolding operation of the foldable housing 
     According to another aspect of the invention, a method for operating a foldable electronic device having a foldable enclosure, a hinge to allow the foldable enclosure to be folded, a biaser supported for incremental movement during folding or unfolding of the foldable enclosure, a stop to selectively restrict the movement of the follower, an actuator having an electrical switch to control the folding or unfolding operation, and a sensor to detect the folding or unfolding operation includes the steps of: identifying whether or not an electrical signal is generated from the electrical switch; detecting, by the folding sensor, whether or not the foldable housing is being folded or unfolded; and when the electrical switch does not generate the electrical signal and the folding sensor detects a folding or unfolding operation, outputting a warning signal including at least one of a warning sound, a warning vibration, or a warning message display. 
     The method may further include the step of: when the electrical switch generates the electrical signal and the folding sensor detects folding or unfolding, performing a haptic operation to generate at least one of sound effect playback, haptic vibration, animation playback, and turning-on or off of a display to enhance a user&#39;s recognition of the folding or unfolding operation. 
     The actuator may further includes a fingerprint recognition sensor to generate a fingerprint identification signal with respect to a selected fingerprint, and the method may further include the step of: when the electrical switch generates the electrical signal, the folding sensor detects the folding operation, and the fingerprint recognition sensor generates the fingerprint identification signal, unlocking the foldable housing to permit folding. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the inventive concepts. 
         FIG.  1    is a block diagram of an embodiment of an electronic device constructed according to the principles of the invention in a network environment. 
         FIGS.  2 A to  2 F  illustrate an embodiment of a foldable electronic device in the form of a mobile phone having an in-folding type housing structure constructed according to the principles of the invention. 
         FIG.  3 A  is a cross-sectional view of a first embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  3 B  is a cross-sectional view of a first embodiment of an interlocking part and a motion restriction member of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  3 C  is a schematic cross-sectional view illustrating an operation of the interlocking part and the motion restriction member of  FIG.  3 B . 
         FIG.  4 A  is a cross-sectional view of a second embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  4 B  is an enlarged perspective view of a second embodiment of an interlocking part and a motion restriction member of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  4 C  is a schematic cross-sectional view illustrating an operation of the interlocking part and the motion restriction member of the foldable electronic of  FIG.  4 B . 
         FIG.  5 A  is a cross-sectional view illustrating an operation of a third embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  5 B  is an enlarged perspective view illustrating the sliding pin of the foldable electronic device of  FIG.  5 A . 
         FIG.  5 C  is a cross-sectional view of a third embodiment of an interlocking part and a motion restriction member of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  5 D  is an enlarged perspective view of the interlocking part and a motion restriction member of  FIG.  5 C . 
         FIG.  5 E  is a schematic cross-sectional view illustrating an operation of the interlocking part and the motion restriction member of  FIG.  5 D . 
         FIG.  6 A  is a cross-sectional view of a fourth embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  6 B  is an enlarged perspective view of a fourth embodiment of the interlocking part and a motion restriction member of  FIG.  6 A . 
         FIG.  6 C  is a schematic cross-sectional view illustrating an operation of the interlocking part and the motion restriction member of  FIG.  6 B . 
         FIG.  6 D  is a cross-sectional view of a fifth embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  6 E  is an enlarged perspective view of a fifth embodiment of an interlocking part and a motion restriction member of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIGS.  7 A to  7 D  are schematic cross-sectional views of various embodiments of a sliding member and a linear brake of  FIGS.  6 A to  6 E . 
         FIG.  8 A  is a cross-sectional view of a sixth embodiment of a hinge part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  8 B  is an enlarged perspective view of a sixth embodiment of the sliding member and the motion restriction member of  FIG.  8 A . 
         FIG.  8 C  is a schematic cross-sectional view illustrating an operation of the sliding member and the motion restriction member of  FIG.  8 B . 
         FIG.  9 A  is a perspective view of an embodiment of an electrical switch of a button part of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  9 B  is a perspective view of an embodiment of a push button of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  9 C  is a schematic cross-sectional view illustrating an operation of the button part and members of the foldable electronic device of  FIGS.  2 A to  2 F . 
         FIG.  10    is a flowchart schematically illustrating operations that may occur based on manipulation of the button part shown in  FIG.  9 C  of the foldable electronic device of  FIGS.  2 A to  2 F . 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various embodiments or implementations of the invention. As used herein “embodiments” and “implementations” are interchangeable words that are non-limiting examples of devices or methods employing one or more of the inventive concepts disclosed herein. It is apparent, however, that various embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring various embodiments. Further, various embodiments may be different, but do not have to be exclusive. For example, specific shapes, configurations, and characteristics of an embodiment may be used or implemented in another embodiment without departing from the inventive concepts. 
     Unless otherwise specified, the illustrated embodiments are to be understood as providing exemplary features of varying detail of some ways in which the inventive concepts may be implemented in practice. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions, and/or aspects, etc. (hereinafter individually or collectively referred to as “elements”), of the various embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts. 
     The use of cross-hatching and/or shading in the accompanying drawings is generally provided to clarify boundaries between adjacent elements. As such, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, dimensions, proportions, commonalities between illustrated elements, and/or any other characteristic, attribute, property, etc., of the elements, unless specified. Further, in the accompanying drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. When an embodiment may be implemented differently, a specific process order may be performed differently from the described order. For example, two consecutively described processes may be performed substantially at the same time or performed in an order opposite to the described order. Also, like reference numerals denote like elements. 
     When an element, such as a layer, is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it may be directly on, connected to, or coupled to the other element or layer or intervening elements or layers may be present. When, however, an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers present. To this end, the term “connected” may refer to physical, electrical, and/or fluid connection, with or without intervening elements. Further, the D1-axis, the D2-axis, and the D3-axis are not limited to three axes of a rectangular coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the D1-axis, the D2-axis, and the D3-axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be construed as X only, Y only, Z only, or any combination of two or more of X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     Although the terms “first,” “second,” etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure. 
     Spatially relative terms, such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), and the like, may be used herein for descriptive purposes, and, thereby, to describe one elements relationship to another element(s) as illustrated in the drawings. Spatially relative terms are intended to encompass different orientations of an apparatus in use, operation, and/or manufacture in addition to the orientation depicted in the drawings. For example, if the apparatus in the drawings is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. Furthermore, the apparatus may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and, as such, the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms, “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Moreover, the terms “comprises,” “comprising,” “includes,” and/or “including,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is also noted that, as used herein, the terms “substantially,” “about,” and other similar terms, are used as terms of approximation and not as terms of degree, and, as such, are utilized to account for inherent deviations in measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. 
       FIG.  1    is a block diagram illustrating an electronic device  101  in a network environment  100  according to various embodiments. Referring to  FIG.  1   , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or at least one of an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input module  150 , a sound output module  155 , a display module  160 , an audio module  170 , a sensor module  176 , an interface  177 , a connecting terminal  178 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module (SIM)  196 , or an antenna module  197 . In some embodiments, at least one of the components (e.g., the connecting terminal  178 ) may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In some embodiments, some of the components (e.g., the sensor module  176 , the camera module  180 , or the antenna module  197 ) may be implemented as a single component (e.g., the display module  160 ). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  coupled with the processor  120 , and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor  120  may store a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . According to an embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor  123  (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  121 . For example, when the electronic device  101  includes the main processor  121  and the auxiliary processor  123 , the auxiliary processor  123  may be adapted to consume less power than the main processor  121 , or to be specific to a specified function. The auxiliary processor  123  may be implemented as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one component (e.g., the display module  160 , the sensor module  176 , or the communication module  190 ) among the components of the electronic device  101 , instead 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 state (e.g., executing an application). According to an embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . According to an embodiment, the auxiliary processor  123  (e.g., the neural processing unit) may include a hardware structure specified for artificial intelligence model processing. An artificial intelligence model may be generated by machine learning. Such learning may be performed, e.g., by the electronic device  101  where the artificial intelligence is performed or via a separate server (e.g., the server  108 ). Learning algorithms may include, but are not limited to, e.g., supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers. The 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), deep Q-network or a combination of two or more thereof but is not limited thereto. The artificial intelligence model may, additionally or alternatively, include a software structure other than the hardware structure. 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thereto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . 
     The program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input module  150  may receive a command or data to be used by another component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . 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). 
     The sound output module  155  may output sound signals 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 playing multimedia or playing record. The receiver may be used for receiving incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display module  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display module  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display module  160  may include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of force incurred by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module  170  may obtain the sound via the input module  150 , or output the sound via the sound output module  155  or a headphone of an external electronic device (e.g., an electronic device  102 ) directly (e.g., wiredly) or wirelessly coupled with the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and then generate an electrical signal or data value corresponding to the detected state. According to an embodiment, the sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly (e.g., wiredly) or wirelessly. According to an 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. 
     A connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). According to an embodiment, the connecting terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. According to an embodiment, the haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image or moving images. According to an embodiment, the camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to one embodiment, the power management module  188  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . According to an embodiment, the battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  194  (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  199  (e.g., a long-range communication network, such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify and authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module  196 . 
     The wireless communication module  192  may support a 5G network, after a 4G network, and next-generation communication technology, e.g., new radio (NR) access technology. The NR access technology may support enhanced mobile broadband (eMBB), massive machine type communications (mMTC), or ultra-reliable and low-latency communications (URLLC). The wireless communication module  192  may support a high-frequency band (e.g., the mmWave band) to achieve, e.g., a high data transmission rate. The wireless communication module  192  may support various technologies for securing performance on a high-frequency band, such as, e.g., beamforming, massive multiple-input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, or large-scale antenna. The wireless communication module  192  may support various requirements specified in the electronic device  101 , an external electronic device (e.g., the electronic device  104 ), or a network system (e.g., the second network  199 ). According to an embodiment, the wireless communication module  192  may support a peak data rate (e.g., 20 Gbps or more) for implementing eMBB, loss coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of downlink (DL) and uplink (UL), or a round trip of 1 ms or less) for implementing URLLC. 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  101 . According to an embodiment, the antenna module  197  may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, the antenna module  197  may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  198  or the second network  199 , may be selected, for example, by the communication module  190  (e.g., the wireless communication module  192 ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module  197 . 
     According to various embodiments, the antenna module  197  may form a mmWave antenna module. According to an embodiment, the mmWave antenna module may include a printed circuit board, a RFIC disposed on a first surface (e.g., the bottom surface) of the printed circuit board, or adjacent to the first surface and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., the top or a side surface) of the printed circuit board, or adjacent to the second surface and capable of transmitting or receiving signals of the designated high-frequency band. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . Each of the electronic devices  102  or  104  may be a device of a same type as, or a different type, from the electronic device  101 . According to an embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , or  108 . For example, if the electronic device  101  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MWC), or client-server computing technology may be used, for example. The electronic device  101  may provide ultra-low-latency services using, e.g., 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 a neural network. According to an embodiment, the external electronic device  104  or the server  108  may be included in the second network  199 . The electronic device  101  may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology or IoT-related technology. 
     The electronic device according to various embodiments may be one of various types of electronic devices. The electronic devices 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 home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases 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, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used in connection with various embodiments of the disclosure, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various embodiments as set forth herein may be implemented as software (e.g., the program  140 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  136  or external memory  138 ) that is readable by a machine (e.g., the electronic device  101 ). For example, a processor (e.g., the processor  120 ) of the machine (e.g., the electronic device  101 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a complier or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, the term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an embodiment, a method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., Playstree t ), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
       FIGS.  2 A to  2 F  illustrate an embodiment of a foldable electronic device in the form of a mobile phone having an in-folding type housing structure constructed according to the principles of the invention. Specifically,  FIGS.  2 A and  2 B  illustrate the front of the foldable electronic device in an unfolded position.  FIG.  2 C  is a perspective view illustrating the back of the foldable electronic device in a folded position.  FIG.  2 D  is a plan view illustrating the back of the foldable electronic device in an unfolded position.  FIG.  2 E  is a perspective view of the foldable electronic device in an intermediate position.  FIG.  2 F  is an exploded perspective view of the foldable electronic device. 
     Referring to  FIGS.  2 A to  2 F , a foldable electronic device  200  (e.g., the electronic device  101  in  FIG.  1   ) may include an enclosure that maybe in the form of first housing  210 , a second housing  220 , a hinge that maybe in the form of a hinge assembly  240  interconnecting the first housing  210  and the second housing  220  such that the second housing  220  is rotatable relative to the first housing  210 , a flexible or foldable display  299  disposed in a space defined by the foldable housings  210  and  220 , and a sensor module (e.g., the sensor module  176  in  FIG.  1   ). 
     The display  299  may be disposed from the first housing  210  to the second housing  220  across the hinge assembly  240 . The display  299  may be divided into a first display area  211  disposed in the inner space of the first housing  210  and a second display area  221  disposed in the inner space of the second housing  220  with reference to the folding axis A. The sensor module (e.g., an illuminance sensor) may be disposed under a sensor area (or a light transmission area)  242   a  of the first display area  211  in a plan view. The location and/or size of the sensor area  242   a  in the first display area  211  may be determined by the location and/or size of the illuminance sensor disposed thereunder. For example, the size (e.g., the diameter) of the sensor area  242   a  may be determined based on a field of view (FOV) of the illuminance sensor. In an embodiment, the sensor area  242   a  may be configured to have a lower pixel density and/or a lower wiring density than that in the periphery thereof to improve light transmittance. 
     The hinge assembly  240  may be implemented to allow inward folding (in-folding type), which causes the two display areas  211  and  221  to face each other when the foldable electronic device  200  is switched from the expanded (e.g., unfolded) position (e.g., the position in  FIGS.  2 A,  2 B, and  2 D ) to the compact (e.g., folded) position (e.g., the position in  FIG.  2 C ). For example, when the electronic device  200  is in the unfolded position, the two display areas  211  and  221  may face substantially the same direction. As the position is changed from the unfolded position to the folded position, the two display areas  211  and  221  may be rotated in a direction in which the two display areas face each other. The hinge assembly  240  may be configured such that the foldable housings  210  and  220  has resistance to rotation. When an external force exceeding the resistance is applied to the foldable housings  210  and  220 , the foldable housings  210  and  220  may be rotated. 
     Based on the angle formed between the two display areas  211  and  221 , the position of the electronic device  200  may be defined. For example, the position of the electronic device  200  may be defined as an expanded, unfolded (in other words, flat, or open) position when the angle between the two display areas  211  and  221  is about 180 degrees. When the angle between the two display areas  211  and  221  is between about 0 and 10 degrees, the position of the foldable electronic device  200  may be defined as a compact, folded or closed position. When the two display areas  211  and  221  form an angle greater than the angle in the folded position and smaller than the angle in the unfolded position (e.g., between about 10 degrees and 179 degrees), the position may be defined as an intermediate position (in other words, a partially folded or partially unfolded position) as illustrated in  FIG.  2 E . 
     An active area in which visual information (e.g., text, image, or icon) is to be displayed on the display  299  may be determined based on the position of the foldable electronic device  200 . For example, when the electronic device  200  is in the intermediate position, the active area may be determined as the first display area  211  or the second display area  221 . Of the first display area  211  and the second display area  221 , an area having a relatively smaller movement may be defined as the active area. For example, when the user holds one housing of the electronic device  200  with one hand and opens another housing with a finger (e.g., the thumb) of the same hand or the other hand, the electronic device  200  may be switched from the folded position to the intermediate position, and as a result, in the electronic device  200 , the display area of the held housing (i.e., the housing having a relatively smaller movement) may be defined as the active area. When the foldable electronic device  200  is in the unfolded position, the entire area of the display  299  (e.g., both the first display area  211  and the second display area  221 ) may be defined as the active area. 
     In the unfolded position, the first housing  210  may include a first surface (a first display area)  211  oriented in a first direction (e.g., the front direction) (the z-axis direction) and a second surface  212  oriented in a second direction (e.g., a rear direction) (the −z-axis direction) in which the second surface faces away from the first surface  211 . In the unfolded position, the second housing  220  may include a third surface (a second display area)  221  oriented in the first direction (e.g., the z-axis direction) and a fourth surface  222  oriented in the second direction (e.g., the −z-axis direction). The electronic device  200  may be operate such that, in the unfolded position, the first surface  211  of the first housing  210  and the third surface  221  of the second housing  220  are oriented in the same first direction (e.g., the z-axis direction), and, in the folded position, the first surface  211  and the third surface  221  face each other. The electronic device  200  may be operated such that, in the unfolded position, the second surface  212  of the first housing  210  and the fourth surface  222  of the second housing  220  are oriented in the same second direction (the z-axis direction), and, in the folded position, the second surface  212  and the fourth surface  222  face away from each other. 
     The first housing  210  may include a first side frame  213  forming at least a portion of the exterior of the electronic device  200  and a first rear cover  214  coupled to the first side frame  213  and forming at least a portion of the second surface  212  of the electronic device  200 . According to an embodiment, the first side frame  213  may include a first side surface  213   a , a second side surface  213   b  extending from one end of the first side surface  213   a , and a third side surface  213   c  extending from the other end of the first side surface  213   a . According to an embodiment, the first side frame  213  may be formed in a substantially rectangular (e.g., square or rectangular) shape via the first side surface  213   a , the second side surface  213   b , and the third side surface  213   c.    
     A portion of the first side frame  213  may be formed of a conductor. For example, referring to  FIG.  2 B , a portion   of the first side surface  213   a , a portion   of the second side surface  213   b , and a portion   of the third side surface  213   c  may be formed of a metal material. The conductors may be electrically connected to grip sensors, respectively, which are disposed in the inner space of the first housing  210  adjacent thereto. A processor may measure the capacitances formed between the conductors and a ground (e.g., a ground of a main printed circuit board) via the grip sensors, and may recognize that a dielectric body (e.g., a finger, a palm, or a face) is adjacent to (or in contact with) the first housing  210  and a location that is contact with the dielectric body in the first housing  210  (e.g., the first side surface  213   a , the second side surface  213   b , or the third side surface  213   c ) based on the measured capacitance values. 
     The second housing  220  may include a second side frame  223  forming at least a portion of the exterior of the electronic device  200  and a second rear cover  224  coupled to the second side frame  223  and forming at least a portion of the fourth surface  222  of the electronic device  200 . According to an embodiment, the second side frame  223  may include a fourth side surface  223   a , a fifth side surface  223   b  extending from one end of the fourth side surface  223   a , and a sixth side surface  223   c  extending from the other end of the fourth side surface  223   b . According to an embodiment, the second side frame  223  may be formed in a rectangular shape via the fourth side surface  223   a , the fifth side surface  223   b , and the sixth side surface  223   c.    
     A portion of the second side frame  223  may be formed of a conductor. For example, referring to  FIG.  2 B , a portion   of the fourth side surface  223   a , a portion   of the fifth side surface  223   b , and a portion   of the sixth side surface  223   c  may be formed of a metal material. The conductors may be electrically connected to grip sensors (not illustrated), respectively, which are disposed in the inner space of the second housing  220  adjacent thereto. A processor may measure the capacitance formed between the conductors and a ground (e.g., a ground of a main printed circuit board) via the grip sensors, and may recognize that a dielectric body is close to (or in contact with) the second housing  220  and a place that is contact with the dielectric body in the second housing  220  (e.g., the fourth side surface  223   a , the fifth side surface  223   b , or the sixth side surface  223   c ) based on the measured capacitance values. 
     Embodiments of the pair of housing structures  210  and  220  are not limited to the illustrated shape and assembly, but may be implemented in other shapes or other combinations and/or assemblies of components. For example, the first side frame  213  and the first rear cover  214  may be integrally formed, and the second side frame  223  and the second rear cover  224  may be integrally formed. 
     The first rear cover  214  and the second rear plate  224  may be formed of one or a combination of two or more of, for example, coated or colored glass, ceramic, polymer, or metal (e.g., aluminum, stainless steel (STS), or magnesium). 
     The electronic device  200  may include a first protective cover  215  (e.g., a first protective frame or a first decorative member) coupled along the edges of the first housing  210 . The electronic device  200  may include a second protective cover  225  (e.g., a second protective frame or a second decorative member) coupled along the edges of the second housing  220 . According to an embodiment, the first protective cover  215  and the second protective cover  225  may be formed of a metal or polymer material. 
     The electronic device  200  may include a sub-display  231  disposed separately from the display  299 . According to an embodiment, the sub-display  231  is at least partially exposed on the second surface  212  of the first housing  210 , so that when the electronic device  200  is in a folded position, the sub-display  231  may display information of the electronic device  200 , such as its attitude or position. According to an embodiment, the sub-display  231  may be visible from the outside through at least a partial area in the first rear cover  214 . In some embodiments, the sub-display  231  may be disposed on the fourth surface  224  of the second housing  220 . In this case, the sub-display  231  may be visible from the outside through at least one area in the second rear cover  224 . 
     The electronic device  200  may include at least one of an input device  203 , a sound output device  201  or  202 , a camera module  205  or  208 , a key input device  206 , a connector port  207 , and a sensor module (not illustrated). In an embodiment, the sensor module (e.g., the sensor module  176  in  FIG.  1   ), and the camera  205  may be disposed below the display  299  in a plan view. 
     The electronic device  200  may be operated to maintain the intermediate position via the hinge assembly  240 . In this case, the electronic device  200  may control the display  299  to display different contents on the display area corresponding to the first surface  211  and the display area corresponding to the third surface  221 , respectively. 
     Referring to  FIG.  2 F , the electronic device  200  may include a first side frame  213 , a second side frame  223 , and a hinge assembly  240  rotatably connecting the first side frame  213  and the second side frame  223  to each other. According to an embodiment, the electronic device  200  may include a first support plate  2131  at least partially extending from the first side frame  213  and a second support plate  2231  at least partially extending from the second side frame  223 . According to an embodiment, the first support plate  2131  may be integrally formed with the first side frame  213  or may be structurally coupled to the first side frame  213 . Similarly, the second support plate  2231  may be integrally formed with the second side frame  223  or may be structurally coupled to the second side frame  223 . According to an embodiment, the electronic device  200  may include a display  299  supported by the first support plate  2131  and the second support plate  2231 . According to an embodiment, the electronic device  200  may include a first rear cover  214  coupled to the first side frame  213  and providing a first space with the first support plate  2131 , and a second rear cover  224  coupled to the second side frame  223  and providing a second space with the second support plate  2231 . In some embodiments, the first side frame  213  and the first rear cover  214  may be integrally formed. In some embodiments, the second side frame  223  and the second rear cover  224  may be integrally formed. According to an embodiment, the electronic device  200  may include a first housing  210  provided via the first side frame  213 , the first support plate  2131 , and the first rear cover  214 . Also, the electronic device  200  may include a second housing  220  provided via the second side frame  223 , the second support plate  231 , and the second rear cover  224 . 
     The hinge assembly  240  may include a first arm structure coupled to the first housing  210  (e.g., the first support plate  2231 ), a second arm structure coupled to the second housing  220  (e.g., the second support plate  2232 ), and a detent structure that is in physical contact with the first arm structure and the second arm structure such that the first housing  210  and the second housing  220  have resistance to rotation. The foldable housings  210  and  220  may have resistance to rotation by the contact force of the detent structure (e.g., the force pushing the first arm structure and the second arm structure). 
     The electronic device  200  may include a first board assembly  261  (e.g., a main printed circuit board), a camera assembly  263 , a first battery  271 , or a first bracket  251  disposed in a first space between the first side frame  213  and the first rear cover  214 . According to an embodiment, the camera assembly  263  may include a plurality of cameras (e.g., the camera modules  205  and  208  in  FIGS.  2 A and  2 C ), and may be electrically connected to the first board assembly  261 . The first bracket  251  may provide a support structure for supporting the first board assembly  261  and/or the camera assembly  263  and improved rigidity. The electronic device  200  may include a second board assembly  262  (e.g., a sub printed circuit board), an antenna  290  (e.g., a coil member), a second battery  272 , or a second bracket  252  disposed in a second space between the second side frame  223  and the second rear cover  224 . The electronic device  200  may include a wiring member  280  (e.g., a flexible printed circuit board (FPCB)) disposed to extend from the first board assembly  261  across the hinge assembly  240  to a plurality of electronic components (e.g., the second board assembly  262 , the second battery  272 , or the antenna  290 ) disposed between the second side frame  223  and the second rear cover  224  and to provide an electrical connection. 
     The electronic device  200  may include a hinge cover  241 , which is configured to support the hinge assembly  240 , exposed to the outside when the electronic device  200  is in the folded position, and introduced into the first space and the second space to be invisible from the outside when the electronic device  200  is in the unfolded position. 
     The electronic device  200  may include a first protective cover  215  coupled along the edges of the first side frame  213 . According to an embodiment, the electronic device  200  may include a second protective cover  225  coupled along the edges of the second side frame  223 . In the display  299 , the edges of the first display area  211  may be protected by the first protective cover  215 . The edges of the second display area  221  may be protected by the second protective cover  225 . Protective caps  235  may be disposed in an area corresponding to the hinge assembly  240  to protect bent portions of the edges of the display  299 . 
       FIG.  3 A  is a cross-sectional view of a first embodiment of a hinge that may be in the form of a hinge part  310  of the foldable electronic device. 
       FIG.  3 B  is a cross-sectional view of a first embodiment of a follower that may be in the form of an interlocking part  320  ( 321  and  322 ) and a stop that may be in the form of a motion restriction member  340  ( 3431  and  344 ) of the foldable electronic device. 
       FIG.  3 C  is a schematic cross-sectional view illustrating an operation of the interlocking part  320  and the motion restriction member  340  of  FIG.  3 B . 
     Referring to  FIG.  3 A , the foldable electronic device (e.g., the electronic device  200  in  FIGS.  2 A to  2 F ) may include a foldable enclosure that may be in the form of a foldable housing  301 , a hinge that may be in the form of a hinge part  310 , a biaser that may be in the form of an elastic member  313 , a follower that may be in the form of an interlocking part  320 , a stop that may be in the form of a motion restriction member  340 , and an actuator that may be in the form of a button part  350 . 
     The foldable housing  301  (which may be the same as, for example, the foldable housings  210  and  220  in  FIGS.  2 A to  2 F ) may include a plurality of sub-housings  302   a  and  302   b  (e.g., a first housing  302   a  and a second housing  302   b ) in which components of the foldable electronic device, such as a foldable display (e.g., the foldable display  299  in  FIGS.  2 A to  2 F ), are located. The foldable housing  301  may be folded such that the sub-enclosures that may be in the form of sub-housings  302   a  and  302   b  is folded around hinge parts  310 , which will be described later, to face each other in a compact position, or may be unfolded such that the sub-housings  302   a  and  302   b  are located in substantially the same plane defining an expanded position. 
     The hinge parts  310  (e.g., the hinge assembly  240  in  FIGS.  2 A to  2 F ) may be connected to the ends of the plurality of sub-housings  302   a  and  302   b , respectively, and may be rotatable about at least one rotation axis so as to rotatably couple the sub-housings  302   a  and  302   b  to each other. 
     In some embodiments, the hinge parts  310  may include a plurality of hinge leaves  311  coupled to the one of the sub-housings  302   a  and  302   b , and rotated with the sub-housings  302   a  and  302   b  and a plurality of hinge gears  312  configured to cause rotation actions of the hinge leaves  311  to be synchronized with each other during the rotation operation of the hinge. 
     In some embodiments, the foldable electronic device may include a folding sensor  304  (shown in  FIG.  3 A ) configured to detect the rotation operation of the hinge. The folding sensor  304  may be, for example, a motion sensor, such as an optical encoder or a magnetic encoder, attached to the hinge parts  310 . The folding sensor  304  may detect the folding or unfolding operation of the foldable electronic device and may generate a signal to cause the foldable electronic device to perform a selected operation. In another embodiment, the folding sensor  304  may include first and second folding sensors  304   a  and  304   b  secured relative to the first housing  302   a  and the second housing  302   b , respectively. Each of the first and second folding sensors  304   a  and  304   b  may include an inertial sensor that measures an angular velocity of a rotation motion in at least one axial direction and an acceleration of a translation motion in at least one direction. By measuring and comparing the angular velocities and accelerations applied to the first housing  302   a  and the second housing  302   b  of the foldable housing, the folding or unfolding operation of the foldable housing can be detected. Measurement and comparison of angular velocities and accelerations may be performed, for example, by a signal processing processor or other processors (e.g., the processor  120  in  FIG.  1   ) embedded in folding sensor  304 . The inertial sensors may each include, for example, a MEMS inertial sensor driven by a piezoelectric element. The operation of the foldable electronic device based on signals detected by the folding sensor  304  will be described later. 
     The elastic member  313  may be a member configured to unfold the foldable housing  301  by applying a rotational force to the hinge by an elastic force. In some embodiments, the elastic member  313  may include a coil spring disposed substantially parallel to the rotation axis of the hinge. The axial thrust of the coil spring may be converted into a rotational force by a cylindrical cam  314  to drive the hinge. In another embodiment, the elastic member  313  may include various elastic rotation members  313  that apply a rotational force by an elastic force, such as a torsion bar, a torsion spring, a spiral spring, or a clockwork. When the elastic member  313  applies a rotational force to the hinge, the user may perform an unfolding operation of the foldable electronic device without directly applying a force to the foldable electronic device, thereby improving the user&#39;s convenience. 
     The interlocking part  320  may be a part that is located inside at least one of the sub-housings  302   a  and  302   b  and moves in an interlocking manner with the folding or unfolding operation of the foldable housing  301 . The motion restriction member  340  may be a member that selectively restricts the movement of the interlocking part  320  by selectively coming into contact with or being separated from the interlocking part  320 . The interlocking part  320  moves in an incremental such as step-wise manner with the folding or unfolding operation of the foldable housing  301 , and since the motion restriction member  340  selectively restricts the movement of the interlocking part  320 , the user may control the folding and/or unfolding operation of the foldable electronic device via the motion restriction member  340 . The motion restriction member  340  may include a return spring  352  that returns the positions of the motion restriction member  340  and the button part  350  to be described later when the user does not manipulate the motion restriction member  340 . 
     Various embodiments of the interlocking part  320  and the motion restriction member  340  will be described below with respect to  FIGS.  3 B and  3 C . 
     The button part  350  may be a member that drives the movement restriction member  340  to selectively come into contact with or be separated from the interlocking part  320  by being manipulated by the user. When the user manipulates the button part  350 , the motion restriction member  340  is operated, and the movement of the interlocking part  320  is selectively restricted by the motion restriction member  340 . Therefore, the user may control the folding and/or unfolding operation of the foldable electronic device. The button part  350  may include a push button  351  or a push lever that can be manipulated by being pushed or moved by the user. In some embodiments, the button part  350  may include an electrical switch  354  configured to generate an electrical signal in response to the user&#39;s manipulation and may be configured to also function as a power key (e.g., the key input device  206  in  FIGS.  2 A to  2 F ). In some embodiments, the movement restriction member  340  may include a button base  341  having a surface oriented in the direction in which the push button  351  or the push lever is manipulated. The electrical switch is disposed on the oriented surface. When the user does not press the push button  351 , the return spring  352  presses the button base  341 , and the button base  341  presses the electrical switch  354  and the push button  351 , whereby the push button  351  can be returned. The foldable electronic device may determine whether or not the button part  350  is manipulated by the user using the electrical switch  354 , and may perform a selected operation depending on whether or not the button part  350  is manipulated by the user. The operation of the foldable electronic device based on the manipulation of the electrical switch  354  of the button part  350  will be described later with  FIGS.  9 A to  9 C . 
     Referring to  FIGS.  3 A to  3 C , the interlocking part  320  may include a ratchet wheel  321 , and the motion restriction member  340  may include a ratchet pawl  3431 . 
     The ratchet wheel  321  may be a disk-shaped member that is rotated about an axis and having a plurality of teeth provided on the outer periphery thereof. In some embodiments, the interlocking part  320  may include a first interlocking gear  322  coupled with the ratchet wheel  321  about the same axis as the ratchet wheel  321 . Referring to  FIGS.  3 A and  3 B , the interlocking part  320  may further include a second interlocking gear  323 , which is engaged with the hinge gear  312  of the hinge part  310  and the first interlocking gear  322  to make the ratchet wheel  321  interlock with the rotation action of the ratchet wheel  321 . 
     The ratchet pawl  331  may be a member that stops rotation of the ratchet wheel  321  by being selectively engaged with the ratchet wheel  321 . In some embodiments, the motion restriction member  340  may include a wedge member  344 , which is driven by the button part  350  and has an inclined surface  3441 , wherein, when moving relative to the ratchet pawl  331 , the inclined surface  3441  moves the ratchet pawl  331  in a direction in which the ratchet pawl  331  is disengaged from the ratchet wheel  321 . When the button part  350  is pushed by the user, the wedge member  344  moves the ratchet pawl  331  to disengage the ratchet pawl  331  and the ratchet wheel  321  from each other, whereby the ratchet wheel  321  can be rotated, and thus the hinge can be rotated to fold or unfold the foldable electronic device. 
       FIG.  4 A  is a cross-sectional view of a second embodiment of a hinge part  310  ( 312 ) of the foldable electronic device. 
       FIG.  4 B  is an enlarged perspective view of a second embodiment of an interlocking part  320  ( 322 ,  323 , and  324 ) and a motion restriction member  340  ( 341 ,  342 , and  3432 ) of the foldable electronic device. 
       FIG.  4 C  is a schematic cross-sectional view illustrating an operation of the interlocking part  324  and the motion restriction member  3432  of  FIG.  4 B . 
     Referring to  FIGS.  4 A and  4 B , the interlocking part  320  may include a brake rotor  324 , and the motion restriction member  340  may include a brake shoe  3432 . In some embodiments, the brake rotor  324  may include a brake drum having a truncated cone shape, and a first friction surface  324   a  may be formed on the side surface of the truncated cone shape. The brake shoe  3432  may include a second friction surface  3432   a  having a shape corresponding to the first friction surface  324   a . The truncated cone-shaped brake rotor  324  may have an advantage in that the area of the first friction surface  324   a  can be increased compared to a cylindrical shape or disk shape having the same diameter. The brake rotor  324  may be coupled to the first interlocking gear  322  about the same axis as the first interlocking gear  322 , and may be interlocked with the hinge gear  312  of the hinge part  310  via the second interlocking gear  323 . 
     The motion restriction member  340  may include a beam  342  connecting the brake shoe  3432  to the button base  341 . When the button part  350  is not pushed, the return spring  352  presses the button base  341 , and the force of the return spring  352  is transmitted to the brake shoe  3432  of the motion restriction member  340  via the beam  342  to bring the brake shoe  3432  into contact with the brake rotor  324  and to press the brake shoe  3432  against the brake rotor  324 . In a position in which the brake shoe  3432  presses the brake rotor  324 , the folding and unfolding operations may be restricted due to a frictional force applied to the brake rotor  324 . By adjusting the number, arrangement, and spring coefficient of return springs  352 , the strength of the frictional force can be adjusted. 
     Referring to  FIG.  4 C , when the button part  350  (shown in  FIG.  4 A ) is pushed, the brake shoe  3432  may be separated from the brake rotor  324 . Since no frictional force is applied to the brake rotor  324  when the brake shoe  3432  is separated, the brake rotor  324  is freely rotatable so that the folding or unfolding operation of the foldable electronic device according to the rotation of the hinge gear  312  can be performed. 
     Since the folding or unfolding operation of the foldable electronic device is controlled by the brake rotor  324  and the brake shoe  3432 , there is an advantage in that the foldable housing  301  can be fixed at an arbitrary folding angle. The description, “the foldable housing  301  can be fixed at any folding angle”, may be referred to as “free stop”. In addition, when a force for folding or unfolding the foldable electronic device is applied from the outside in the position in which the user does not manipulate the button part  350 , the brake shoe  3432  and the brake rotor  324  may allow rotation while slipping, thereby allowing the folding or unfolding of the foldable electronic device. Therefore, even if the user folds or unfolds the foldable electronic device without manipulating the button part  350 , the risk of damage to the hinge part  310  and/or the interlocking part  320  may be reduced. 
       FIG.  5 A  is a cross-sectional view illustrating an operation of third embodiment of a hinge part  310  of the foldable electronic device. 
       FIG.  5 B  is an enlarged perspective view illustrating the sliding pin  333  of the foldable electronic device of  FIG.  5 A . 
       FIG.  5 C  is a cross-sectional view of a third embodiment of an interlocking part  320  ( 322 ,  323 ,  330  and  331 ) and a motion restriction member  340  ( 341 ,  342  and  3452 ) of the foldable electronic device. 
       FIG.  5 D  is an enlarged perspective view of the interlocking part and a motion restriction member of  FIG.  5 C . 
       FIG.  5 E  is a schematic cross-sectional view illustrating an operation of the interlocking part and the motion restriction member of  FIG.  5 D . 
     Referring to  FIG.  5 A , the rotation axis A of a sub-housing  302  (e.g., a second housing  302   b ) of the foldable electronic device may be spaced apart from the rotation axis B of the hinge gear  312  of the hinge part  310 . In this case, the rotation trajectory A′ of the sub-housing  302   b  and the rotation trajectory B′ of a hinge leaf  311  (shown in  FIG.  3 A ) of the hinge part  310  may be different from each other. Accordingly, the distance (D1, D2) between the hinge gear  312  of the hinge part  310  and the first interlocking gear  322  located in the sub-housing  302   b  may vary at the time of folding and unfolding operations of the foldable housing  301  which includes a plurality of sub-housings  302   a  and  302   b  (e.g., a first housing  302   a  and a second housing  302   b ). The configuration of the hinge part  310  rotating about the rotation axis spaced apart from the rotation axis of the hinge gear  312  may be referred to as a blooming hinge. The blooming hinge may compensate for the thickness of the hinge part  310  and/or the foldable housing  301  to provide assistance such that the foldable display (e.g., the foldable display  299  in  FIG.  2 F ) can be unfolded to be flat when the foldable electronic device is unfolded. 
     Referring to  FIG.  5 B , in order to compensate for the change in the distance between the sub-housings  302   a  and  302   b  (shown in  FIG.  3 A ) and the hinge shaft, the foldable electronic device may include a sliding pin  333  fixed relative to the hinge leaf  311  of the hinge part  310 , and a sliding guide  303  fixed to the sub-housing  302   b  of the foldable housing  301  and slidably coupled to the sliding pin  333 . 
     Referring to  FIGS.  5 C and  5 D , the interlocking part  320  (shown in  FIG.  5 A ) may include a movable member that may be in the form of a sliding member  330 . The sliding member  330  may be a member that is interlocked with the folding and unfolding operations of the foldable housing  301  and slides relative to the sub-housings  302   a  and  302   b . In some embodiments, the sliding member  330  may be coupled to the sliding pin  333 . The sliding member  330  may include a rack  331  having gear teeth linearly arranged in the direction in which the sliding member  330  slides. The second interlocking gear  323  of the interlocking part  320  may be a pinion gear that is rotated in engagement with the rack  331 . The second interlocking gear  323  may be engaged with the first interlocking gear  322  coupled on the same rotation axis as the brake rotor  324 . The brake rotor  324  may have a first friction surface  324   a  having a cylindrical shape, and the brake shoe  3432  of the motion restriction member  340  may have a second friction surface  3432   a  having a shape corresponding to the cylindrical shape of the brake rotor  324 . 
     When the button part  350  ( 351 ,  352  and  354  shown in  FIG.  5 C ) is not pushed, the return spring  352  of the button part  350  may bring the brake shoe  3432  of the motion restriction member  340  into contact with the brake rotor  324  and may press the brake shoe  3432  against the brake rotor  324  via the beam  342 . In a position in which the brake shoe  3432  presses the brake rotor  324 , the folding operation may be restricted due to the frictional force applied to the brake rotor  324 . Referring to  FIG.  5 D , the brake shoe  3432  may be coupled to the button part  350  via the beam  342 . In some embodiments, an electrical switch  354  is located on a surface of the beam  342  that is pressed by the push button  351  of the button part  350  so that the electrical switch  354  can generate an electrical signal when the button part  350  is pushed. 
     Referring to  FIG.  5 E , when the button part  350  is pushed, the brake shoe  3432  may be separated from the brake rotor  324 . Since no frictional force is applied to the brake rotor  324  when the brake shoe  3432  is separated, the brake rotor  324  is freely rotatable so that the folding or unfolding operation of the foldable electronic device according to the rotation of the hinge can be performed. 
       FIG.  6 A  is a cross-sectional view of a fourth embodiment of a hinge part of the foldable electronic device. 
       FIG.  6 B  is an enlarged perspective view of a fourth embodiment of the interlocking part  320  and a motion restriction member  340  of  FIG.  6 A . 
       FIG.  6 C  is a schematic cross-sectional view illustrating an operation of the interlocking part  330  and the motion restriction member  3433  of  FIG.  6 B . 
       FIG.  6 D  is a cross-sectional view of a fifth embodiment of a hinge part of the foldable electronic device. 
       FIG.  6 E  is an enlarged perspective view of a fifth embodiment of the interlocking part  320  and the motion restriction member  340  of  FIG.  6 D . 
     Referring to  FIGS.  6 A and  6 B , the interlocking part  320  may include a sliding cantilever  334  extending from the sliding pin  333  and a sliding member  330 . The sliding member  330  may include a sliding friction surface  332 . The sliding member  330  may be disposed at the distal end of the sliding cantilever  334  such that the sliding friction surface  332  is oriented in a direction opposite to the direction in which the button part is pushed by the user. The motion restriction member  340  may include a linear brake  3433  including a surface  3434  facing the sliding friction surface  332 , wherein the linear brake  3433  applies a frictional force to the sliding member  330  by bringing the linear friction surface into contact with the sliding friction surface  332  and is operated by the button part  350  via the beam  342 . 
     Referring to  FIG.  6 C , when the user does not manipulate the button part  350 , the return spring  352  may press the base plate of the button part  350 , and the linear brake  3433  may be pressed against the sliding friction surface  332  of the sliding member  330  by the beam  342  coupled to the base plate to apply a frictional force against the movement of the sliding member  330 . When the user manipulates the button part  350 , the linear brake  3433  is separated from the sliding member  330  to release the frictional force, and no resistance is applied against the folding and unfolding operations. 
     In some embodiments, at least one of the sliding friction surface  332  and/or the surface of the linear brake  3433  facing the sliding friction surface  332  may include an irregularity. The irregularity may increase the frictional force applied by the linear brake  3433  to the sliding member  330 . The configuration of the irregularity will be described later. 
     Referring to  FIGS.  6 D and  6 E , in another embodiment, the motion restriction member  340  may include a plate-shaped beam  342  extending in a direction perpendicular to the button base  351  from the center of the button base  341  in the long axis direction, wherein the plate-shaped beam  342  is cut to form a hollow portion  342   a  such that the return spring  352  and a support rod  353  supporting the return spring  352  are located in the hollow portion  342   a . The linear brake  3433  may be arranged in a bent direction at the distal end of the plate-shaped beam  342 . Since the beam  342  has a plate shape, it is possible to stably support the linear brake  3433  with respect to the button base  341 . In some embodiments, the brake may include a latch  3433   a , which is a member that restricts the range of motion of the sliding member and prevents the button base from being jammed due to excessive pressing by the return spring  352 . 
       FIGS.  7 A to  7 D  are schematic cross-sectional views of various embodiments of a sliding member  330  and a linear brake  3433  of  FIGS.  6 A to  6 E . 
     Referring to  FIG.  7 A , the sliding member  330  may include a sliding friction surface  332 , and the linear brake  3433  may include a friction surface  3434  facing the sliding friction surface  332 . Referring to  FIG.  7 B , in some embodiments, the sliding member  330  may include a first brake pad  332   a  attached on the sliding friction surface  332 , and the linear brake  3433  may include a second brake pad  3434   a  attached on the surface  3434  facing the sliding friction surface  332  to face the first brake pad  332   a . The first and second brake pads  332   a  and  3434   a  may include a material having high frictional force and high heat resistance, such as rubber, carbon fiber, Kevlar fiber, ceramic, a metallic sintered compact, or a combination thereof. Since the sliding member  330  and the linear brake  3433  include the first brake pad  332   a  and the second brake pad  3434   a , respectively, it is possible to reduce problems such as abrasion and thermal damage due to heat generation caused when the structural materials of the sliding member  330  and the linear brake  3433  directly rub against each other. 
     Referring to  FIG.  7 C , in some embodiments, the sliding member  330  and the linear brake  3433  may respectively include irregularities  332   b  and  3434   b  formed on the sliding friction surface  332  and the surface  3434  facing the sliding friction surface  332 . The irregularities  332   b  and  3434   b  may improve the friction coefficient of the frictional force applied by the linear brake  3433  to the sliding member  330 . Accordingly, by reducing the elastic force of the return spring  352  required to apply the same frictional force, it is possible to reduce the force required for the user to manipulate the button part  350 . The number, height, and shape of the irregularities  332   b  and  3434   b  may be adjusted to obtain a level of frictional force required to stop the folding and unfolding operations of the foldable housing  301 . Although not illustrated, in some embodiments, the irregularities  332   b  and  3434   b  may be formed on the first brake pad  332   a  and the second brake pad  3434   a , respectively. 
     Referring to  FIG.  7 D , in some embodiments, the sliding member  330  and the linear brake  3433  may respectively include asymmetric irregularities  332   c  and  3434   c  formed on the sliding friction surface  332  and the surface  3434  facing the sliding friction surface  332 . The asymmetric irregularities  332   c  and  3434   c  may have a relatively gentle slope with respect to the direction in which the sliding member  330  moves when the foldable housing  301  is folded, and a relatively steep slope with respect to the direction in which the sliding member  330  when the foldable housing  301  is unfolded. Since the sliding member  330  and the linear brake  3433  include the asymmetric irregularities  332   c  and  3434   c , respectively, a relatively weak frictional force may be applied when the foldable electronic device is folded, and a relatively strong frictional force may be applied when the foldable electronic device is unfolded. In order to automate the unfolding operation of the foldable electronic device, the elastic member  313  applies a rotational force to the hinge part  310  in the rotation direction in which the foldable electronic device is unfolded. Thus, stopping the unfolding operation applies a relatively large load to the motion restriction member  340  compared to stopping the folding operation. Therefore, it may be desirable for the interlocking part  320  and the motion restriction member  340  to apply a relatively stronger frictional force for the unfolding operation. 
     In the illustrated embodiments, the frictional force applied by the motion restriction member  340  is set equal to or greater than the force applied to the interlocking part  320  by the elastic force applied by the elastic member  313  to the hinge part  310 . In addition, the frictional force may be set to a level capable of allowing slip between the motion restriction member  340  and the interlocking part  320  while avoiding damage to the hinge part  310 , the interlocking part  320 , and the motion restriction member  340  when folding and unfolding operations of the foldable electronic device are performed. 
       FIG.  8 A  is a cross-sectional view of a sixth embodiment of a hinge part of the foldable electronic device. 
       FIG.  8 B  is an enlarged perspective view of a sixth embodiment of the sliding member  330  and the motion restriction member  340  of  FIG.  8 A . 
       FIG.  8 C  is a schematic cross-sectional view illustrating an operation of the sliding member  330  and the motion restriction member  340  of  FIG.  8 B . 
     Referring to  FIGS.  8 A and  8 B , the sliding member  330  may include a plurality of second sliding friction surfaces  332 ′ disposed to face each other, and the motion restriction member  340  may include a clamp  3435  configured to apply a frictional force to the plurality of second sliding friction surfaces  332 ′ by holding the sliding member  330 . The clamp  3435  is is disposed to face the second sliding friction surfaces  332 ′ at the distal end of the beam  342 , and may be coupled to the distal end of the beam  342  to be movable toward the second sliding friction surfaces  332 ′. In some embodiments, the clamp  3435  may be rotatably coupled to the distal end of the beam  342  via a living hinge made of a material having high stiffness, low viscosity, and high fatigue resistance, such as polypropylene and/or acrylonitrile butadiene styrene (ABS). 
     Referring to  FIG.  8 C , the motion restriction member  340  may include a clamp housing  344  including an inner space into which at least a portion of the clamp  3435  is inserted, and the clamp  3435  may include an inclined surface  3436 , which is in contact with an inner surface  3435   a  of the clamp housing  344 . A return spring  352  is located between the button base  341  and the clamp housing  344  to press the button base  341 , so that the return spring  352  can press the button base  341 . Accordingly, the clamp  3435  coupled to the button base  341  via the beam  342  may be inserted into the clamp housing  344  by the return spring  352 . When the clamp  3435  is inserted into the clamp housing  344 , the inclined surface  3436  slides while being in contact with the inner surface  3435   a  of the clamp housing  344 , and since the clamp  3435  is pressed against the second sliding friction surfaces  332 ′ by the inclined surface  3436 , the clamp  3435  may hold the sliding member  330 . 
     Referring back to  FIG.  8 C , the sliding member  330  may include an expansion portion  335  in which the thickness of the sliding member  330  is gradually increased. The expansion portion  335  may be located at the base portion of the second sliding friction surfaces  332 ′. The clamp  3435  may include a curved portion  3437  formed at the distal end facing the expansion portion  335 . When the button part  350  is manipulated by the user so that the button base  341  is pressed and the clamp  3435  is moved toward the base portion of the sliding member  330 , the curved portion  3437  is moved along the surface of the expansion portion  335 , whereby the clamp  3435  may be opened and the sliding member  330  may be released and slid. 
     Since the clamp  3435  is opened by the expansion portion  335  and the sliding member  330  is released when the user manipulates the button, the clamp  3435  does not require a separate elastic member for release, and the elastic force of the return spring  352  does not need to be large in order to overcome the elastic force of the elastic member of the clamp  3435 . Therefore, there is an advantage in that the button is soft to be easily pushed by the user. 
       FIG.  9 A  is a perspective view of an embodiment of an electrical switch  354  of a button part  350  of the foldable electronic device. 
       FIG.  9 B  is a perspective view of an embodiment of a push button  351  of the foldable electronic device. 
       FIG.  9 C  is a schematic cross-sectional view illustrating an operation of the button part  350  and members of the foldable electronic 
     Referring to  FIG.  9 A , the button part  350  of the foldable electronic device may include an electrical switch  354 . The electrical switch  354  may include a switch board  3541 , a switch cable  3542 , and an elastic dome  3543 . The switch board  3541  may be a member on which a switch circuit is disposed. The switch circuit may include, for example, a plurality of conductive patterns disposed on the board to be electrically spaced apart from each other in a position of being adjacent to each other. The material of the board may be a printed circuit board (PCB) or a flexible printed circuit board (FPCB). Since the flexible printed circuit board has a small thickness, the flexible printed circuit board may occupy a small amount of the internal space of the flexible electronic device. In some embodiments, the button part  350  may be located above the switch board  3541  to be spaced apart from a plurality of conductors and may include a membrane including a conductor and pressed against the switch board  3541  to come into contact with and interconnect the plurality of conductor patterns when the user manipulates the button part  350 . 
     The elastic dome  3543  may be a member that is pressed and elastically deformed when the user manipulates the push button  351  to electrically connect the switch circuit, and that is restored by elasticity when the manipulation is finished. In some embodiments, the elastic dome  3543  may include a thin metal material that is shaped in a dome shape and comes into contact with the plurality of conductor patterns when elastically deformed. In another embodiment, the elastic dome  3543  may include a material such as TPU or silicone rubber, and may be a member for electrically connecting a plurality of conductor patterns to each other by pressing the conductor disposed on the membrane. 
     The switch cable  3542  may be a member that transmits an electrical signal generated by the electrical switch  354  to another component of the electronic device, for example, the processor  120  of  FIG.  1   . Preferably, the switch cable  3542  may be a cable having a small thickness, such as a ribbon cable, a flexible flat cable (FFC), or a flexible printed cable (FPC). Electrical signals generated by the electrical switch  354  may be associated with, for example, an operation of turning on/off of the foldable electronic device and/or a display, a voice recognition AI call operation, and/or various operations of the foldable electronic device set by the user. In addition, the foldable electronic device may be set to perform various operations by causing the electrical signals generated by the electrical switch  354  to be associated with signals generated from the folding sensor  304 . Various operations of the foldable electronic device associated with the electrical switch  354  and the folding sensor  304  will be described later. 
     Referring to  FIG.  9 B , the push button  351  may include a manipulation portion  3512 , a protrusion  3513 , and a main body portion  3511 . The manipulation portion  3512  may be a portion that protrudes to the outside of the foldable housing  301  and is manipulated by the user. The manipulation portion  3512  may have a hexahedral shape as illustrated in  FIG.  9 B . However, this is an example, and the manipulation portion  3512  may have various shapes such as a cylindrical shape or a hemispherical shape. The protrusion  3513  may be a portion that presses the electrical switch  354  when the push button  351  is pushed. The main body portion  3511  may provide a base to which the manipulation portion  3512  and the protrusion  3513  are coupled. In some embodiments, the push button  351  may include ribs  3514  that supplements the rigidity of the main body portion  3511  and adjusts the pushed depth of the push button  351 . 
     In some embodiments, the push button  351  may include a biometric sensor located on a surface to be touched by the user&#39;s finger when the push button  351  is manipulated by the user. The biometric sensor may be various sensors that recognize the user&#39;s unique biometric data, such as a fingerprint recognition sensor and/or a vein pattern sensor. The biometric sensor may detect the user&#39;s unique biometric data for performing an unlocking operation of the foldable electronic device in association with an electrical signal generated by the button part  350  or performing various functions (e.g., electronic payment and/or user authentication) associated with user identification, for example, fingerprint pattern or vein pattern data. 
     Referring to (A) of  FIG.  9 C , in an initial position, the motion restriction member  340  applies a frictional force by pressing the interlocking part  320  (e.g., the sliding member  330 ), and the push button  351  is supported by the elastic dome  3543 . Referring to (B) of  FIG.  9 C , when the user starts to push the push button  351 , the push button  351  presses the elastic dome  3543  so that an electrical signal can be generated by in the electrical switch  354 . In some embodiments, the elastic dome  3543  can be prevented from being excessively pressed by the ribs  3514  supporting the push button  351  in the position in which the elastic dome  3543  is sufficiently pressed. Referring to (C) of  FIG.  9 C , when the user further pushes the push button  351 , the ribs  3514  of the push button  351  presses the motion restriction member  340  in a direction in which the frictional force applied to the interlocking part  320  is reduced, and thus the folding or unfolding operation of the foldable electronic device may be facilitated. 
       FIG.  10    is a flowchart schematically illustrating operations that may occur based on the manipulation of the button part  350  shown in  FIG.  9 C  of the foldable electronic device. 
     Referring to  FIG.  10   , the foldable electronic device may identify whether the electrical switch  354  operates (step  401 ), may identify whether or not a folding or unfolding operation is performed using the folding sensor  304  when detecting an electrical signal of the electrical switch  354  (step  402 ), and may perform a folding or unfolding haptic operation when the folding or unfolding operation is performed (step  403 ). 
     The folding or unfolding haptic operation (step  403 ) may be an operation of feeding back to the user a fact that the folding or unfolding operation is performed in the position in which the user pushes the button part  350  via various sensory signals. For example, the folding or unfolding haptic operation (step  403 ) may include an operation including at least one of effect sound playback, haptic vibration, animation playback, and turning on/off of a display. 
     The effect sound may be a sound that enhances the user&#39;s recognition of the normal folding or unfolding operation of the foldable electronic device and evokes a feeling of comfort, such as a sound that reminds user of the normal operation of a mechanical device. The haptic sound may include, for example, sounds such as a click reminiscent of engagement of a mechanical device, a motor rotation sound and/or a wind noise reminiscent of opening and closing of an automatic door. The haptic vibrations may include low and constant vibrations that remind the user of the normal operation of a mechanical device. The animation may include an image, drawing, or  3 D modeling indicating folding or unfolding of the foldable electronic device. In some embodiments, the animation may include various animations that remind the user of a folding or unfolding operation, such as animations depicting flowers blooming and/or sunrise. The turning on/off of the display may include an operation of displaying a standby screen or a lock screen on the display. In some embodiments, when the button part  350  includes a biometric sensor, the operation of turning on of the display may be performed together with the unlocking operation of the foldable electronic device. 
     Referring back to  FIG.  10   , the foldable electronic device may identify whether or not the electrical switch  354  is operated (step  401 ), and when a folding or unfolding operation is detected in the position in which the electrical switch  354  is not operated (step  402 ), the foldable electronic device may perform a warning operation (step  405 ). The warning operation (step  405 ) is an operation of notifying that there is a risk of a problem such as failure or abrasion of the foldable electronic device when the user folds or unfolds the foldable electronic device in the position in which the button part  350  is not manipulated. In some embodiments, the warning operation (step  405 ) may include operations, such as generation of a warning sound, warning vibration, and/or displaying of a warning message. The warning sound may be a sound that alerts the user or makes the user uncomfortable. The warning sound may include, for example, an effect sound reminiscent of a friction sound of a machine lacking lubrication, a brake operation sound during sudden braking of a vehicle, or a sound of rupture or scratch. Warning vibrations may include vibrations that alert the user and suggest a malfunction of the mechanism, such as strong, short, and repetitive vibrations. The warning message may include a text, a picture, and/or an animation for notifying the user that the button part  350  must be pressed when the foldable electronic device is folded or unfolded. 
     Referring back to  FIG.  10   , when only an electrical signal of the electrical switch  354  is detected without a folding or unfolding operation, the foldable electronic device may perform a basic operation (step  404 ) assigned to the electrical switch  354 , such as turning on/off of a display, voice recognition AI execution, or an operation preset by the user. When the user does not operate the electrical switch  354  and also does not perform a folding or unfolding operation, the foldable electronic device may maintain an idle position (step  406 ) in which the above-described operations are not performed. 
     When the folding or unfolding operation of the foldable electronic device is performed, the aforementioned folding or unfolding haptic operation (step  404 ) may also be performed, thereby improving the user experience of the foldable electronic device. In addition, when the user applies an excessive force to the foldable electronic device to fold or unfold the foldable electronic device without manipulating the button part  350 , the foldable electronic device performs the warning operation (step  405 ) for the user so that the risk of damage to the electronic device by the user&#39;s mistake can be reduced. 
     Although certain embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Accordingly, the inventive concepts are not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as would be apparent to a person of ordinary skill in the art.