FOLDABLE ELECTRONIC DEVICE AND CONTROL METHOD THEREOF

A foldable electronic device includes a hinge structure, a first housing structure connected to the hinge structure, a second housing structure, which is connected to the hinge structure and is foldable with respect to the first housing structure around the hinge structure, a foldable display disposed on one surface of the first housing structure and one surface of the second housing structure, a first magnetic body portion, which is disposed at a position adjacent to one side edge of the first housing structure and includes a magnetic body arranged in the longitudinal direction of the first housing structure and a second magnetic body portion disposed at a position adjacent to one side edge of the second housing structure and at a position corresponding to the first magnetic body portion and includes a magnetic body arranged in the longitudinal direction of the second housing structure and a power supply circuit.

TECHNICAL FIELD

The invention relates to a foldable electronic device, more particularly to a foldable electronic device and a method for controlling the same.

BACKGROUND ART

In line with increasing demands for mobile communication and trends towards highly-integrated electronic devices, various technologies have been developed to improve the portability of electronic devices (for example, mobile communication terminals) and to improve user convenience in connection with use of multimedia functions and the like.

For example, a laptop computer may have an automatic opening module made of a shape memory alloy such that a housing on which a display is installed may be opened automatically, thereby providing user convenience.

There has also been ongoing research such that a foldable electronic device which has a foldable display, and which undergoes frequent opening/closing operations, has an automatic opening module made of a shape memory alloy as in the case of the laptop computer, thereby providing user convenience.

The above-described information may be provided as background art to aid in understanding the invention.

DETAILED DESCRIPTION OF THE INVENTION

Technical Problem

In the case of a shape memory alloy-based opening module of an electronic device, temperature is a major factor of the operating mechanism, and the same may thus be heavily affected by ambient temperature. According to the prior art, a shape memory alloy-based automatic opening module of an electronic device may not respond to the temperature of various environments, thereby causing a time delay for operating and restoring. This may degrade opening and/or restoring immediacy, thereby inconveniencing the user.

Technical Solution

Various embodiments may provide a foldable electronic device including a hinge structure, a first housing structure connected to the hinge structure, a second housing structure connected to the hinge structure and configured to be foldable with respect to the first housing structure around the hinge structure, a foldable display disposed on a surface of the first housing structure and a surface of the second housing structure, a first magnetic body part including a magnetic body which is disposed at a position adjacent to a side edge of the first housing structure and arranged along the longitudinal direction of the first housing structure, and a second magnetic body part including a magnetic body which is disposed at a position adjacent to a side edge of the second housing structure and at a position corresponding to the first magnetic body part and arranged along the longitudinal direction of the second housing structure, wherein at least one of the first magnetic body part or the second magnetic body part is formed as a movable magnetic body module including a power supply circuit and a shape memory alloy wire elongated from one side of the magnetic body along the longitudinal direction of the electronic device.

Various embodiments may provide a method for controlling a foldable electronic device including obtaining at least one of a temperature of or around the electronic device, a tilting state of the electronic device with respect to a direction of gravity, and a folding state of the electronic device, wherein the foldable electronic device comprises a first housing structure and a second housing structure foldable with respect to the first housing structure, and including a processor and an automatic opening module configured to perform an opening operation of the first housing structure with respect to the second housing structure, by using a magnetic body part disposed in each of the first housing structure and the second housing structure and a shape memory alloy member disposed in at least one of the first housing structure or the second housing structure, wherein the processor is configured to adjust a magnitude of power and/or a supply time period of power supplied to the shape memory alloy member, based on at least one element of the temperature of or around the electronic device, the tilting of the electronic device with respect to the direction of gravity, and the folding state of the electronic device.

Various embodiments may provide a foldable electronic device including a hinge structure configured to form a folding axis, a first housing structure which is connected to the hinge structure to be rotatable around the folding axis and includes a first surface configured to face a first direction, a second surface configured to face a second direction opposite to the first direction, and a first side surface disposed to be directed parallel to and spaced apart from the folding axis of the hinge structure, between the first surface and the second surface, a second housing structure which is connected to the hinge structure to be rotatable around the folding axis and includes a third surface configured to face a third direction, a fourth surface configured to face a fourth direction opposite to the third direction and a second side surface disposed to be directed parallel to and spaced apart from the folding axis of the hinge structure, between the third surface and fourth surface, a foldable display disposed on a surface of the first housing structure and a surface of the second housing structure, a power supply circuit, a movable magnetic body module including a magnetic body which is disposed at a position adjacent to the first side surface of the first housing structure and arranged along the longitudinal direction of the first housing structure, and a shape memory alloy member which is electrically connected to the power supply circuit and which is capable of being deformed or restored along the longitudinal direction of the electronic device, and a stationary magnetic body disposed at a position adjacent to a second side surface of the second housing structure and at a position corresponding to the first magnetic body part and arranged along the longitudinal direction of the second housing structure.

Advantageous Effects

According to various embodiments, user convenience may be improved by providing a foldable electronic device configured such that the electronic device can be automatically opened from a closed state to an open state.

According to various embodiments, immediacy of opening and/or restoring operations may be secured in temperature environments in which a shape memory alloy is used, and appropriate control may be performed according to various tilting and folding states of a foldable electronic device, thereby reducing the time of opening and/or restoring operations and power consumption.

According to various embodiments, an automatic opening module including a shape memory alloy may be used to switch the polarity of a magnetic body array, and driving force of a hinge and repulsive force of a flexible display are used for opening operations, thereby implementing an easy-opening operation in which that the same is automatically opened by a predetermined angle (or predetermined distance), thereby improving usability.

MODE FOR CARRYING OUT THE INVENTION

FIG.2is a view illustrating an unfolded state of an electronic device200, according to an embodiment.FIG.3is a view illustrating a folded state of an electronic device200, according to an embodiment. An electronic device200may be a foldable or a bendable electronic device as an example of the electronic device101illustrated inFIG.1.

Referring toFIG.2andFIG.3, in an embodiment, the electronic device200may include a foldable housing201and a flexible or a foldable display250(hereinafter, abbreviated as a “display”250) (e.g., the display device160ofFIG.1) disposed in a space formed by the foldable housing201. According to an embodiment, a surface (or a surface in which the display250is seen from the outside of the electronic device200), on which the display250is disposed, may be defined as the front surface of the electronic device200. In addition, a surface opposite to the front surface may be defined as the rear surface of the electronic device200. In addition, a surface surrounding a space between the front surface and the rear surface may be defined as the side surface of the electronic device200.

According to an embodiment, the foldable housing201may include a first housing structure210, a second housing structure220including a sensor area222, a first rear cover215, a second rear cover225, and a hinge structure230. Here, the hinge structure230may include a hinge cover configured to cover a foldable portion of the foldable housing201. The foldable housing201of the electronic device200may not be limited to the shape and the combination illustrated inFIG.2andFIG.3, and may be implemented by other shapes or combinations and/or couplings of other components. For example, in another embodiment, the first housing structure210and the first rear cover215may be integrally formed, and the second housing structure220and the second rear cover225may be integrally formed.

According to an embodiment, an illuminance sensor (e.g., not shown) and an image sensor (not shown) may be arranged in the sensor area212. The illuminance sensor may detect the amount of light around the electronic device200, and the image sensor may convert light incident through a camera lens into a digital signal. The illuminance sensor and the image sensor may be visually exposed on the flexible display250. According to another embodiment, the illuminance sensor and the image sensor may not be visually exposed. For example, a camera may include an under-display camera (UDC). Pixels in an area of the flexible display250corresponding to the position of the UDC may be configured differently from pixels in other areas so that the image sensor and/or the camera are not visually exposed.

According to an embodiment, the first housing structure210may be connected to the hinge structure230and may include a first surface configured to face a first direction, and a second surface configured to face a second direction opposite to the first direction. The second housing structure220may be connected to the hinge structure230and may include a third surface configured to face a third direction, and a fourth surface configured to face a fourth direction opposite to the third direction. The second housing structure220may rotate with respect to the first housing structure210around the hinge structure230. The electronic device200may be changed to a folded state (status) or an unfolded state (status).

According to an embodiment, the first housing structure210, between the first surface and the second surface, may include a first side surface211adisposed to be parallel to and spaced apart from a folding axis A of the hinge structure230, and the second housing structure220, between the third surface and the fourth surface, may include a second side surface221adisposed to be parallel to and spaced apart from the folding axis A of the hinge structure230. In addition, the first housing structure210may include a third side surface211bwhich is perpendicular to the first side surface211aand has one end connected to the first side surface211aand the other end connected to the hinge structure230, and a fourth side surface211cwhich is perpendicular to the first side surface211a, has one end connected to the first side surface211aand the other end connected to the hinge structure230, and is spaced apart in a direction parallel to the third side surface211b. The second housing structure220may include a fifth side surface221bwhich is perpendicular to the second side surface221aand has one end connected to the second side surface221aand the other end connected to the hinge structure230, and a sixth side surface221cwhich is perpendicular to the second side surface221a, has one end connected to the second side surface221aand the other end connected to the hinge structure230, and is spaced apart in a direction parallel to the fifth side surface221b. When the second housing structure220is folded with respect to the first housing structure210around the hinge structure230, the first side surface211amay be close to the second side surface221a, and when the second housing structure220is unfolded with respect to the first housing structure210around the hinge structure230, the first side surface211aand the second side surface221amay be far away from each other.

According to an embodiment, when the electronic device200is in a fully folded state, the first surface may face the third surface, and when being in a fully unfolded state, the third direction may be identical to the first direction. When being in a fully unfolded state, the distance between the first side surface211aand the second side surface221amay be the farthest.

According to an embodiment, the first housing structure210and the second housing structure220may be respectively arranged at both sides with reference to the folding axis A, and may have an overall symmetrical shape with respect to the folding axis A. As will be described below, the angle formed by or the distances between the first housing structure210and the second housing structure220may become different depending on whether the electronic device200is in an unfolded state (status), a folded state (status), or a partially unfolded (or partially folded) intermediate state (status).

According to an embodiment, as illustrated inFIG.2, the first housing structure210and the second housing structure220may together form a recess configured to accommodate the display250. According to an embodiment, at least a part of the first housing structure210and the second housing structure220may be formed of a metal material or a non-metal material having rigidity of a size selected to support the display250. The at least a part formed of the metal material may provide a ground plane of the electronic device200, and may be electrically connected to a ground line formed on a printed circuit board disposed inside the foldable housing201.

According to an embodiment, a protective member (not shown) may be disposed on the perimeter of the flexible display250. The protective member may be integrally formed with the side surface of the foldable housing201or may be formed as a separate structure. The flexible display250may not be adhered to the side surface of the foldable housing201and/or the protective member. A gap may be formed between the flexible display250and the protective member. The protective member may be configured to cover the internal configuration of the electronic device200from the outside, or to protect the internal configuration of the electronic device200from external impact. According to an embodiment, the protective member may be configured to cover a wire mounted to the flexible display250from the outside, or to protect the wire from external impact.

According to an embodiment, the first rear cover215may be disposed at a side of the folding axis A on the rear surface of the electronic device200and for example, may have a substantially rectangular edge (periphery), and the edge thereof may be surrounded by the first housing structure210. Similarly, the second rear cover225may be disposed at the other side of the folding axis A on the rear surface of the electronic device200, and the edge thereof may be surrounded by the second housing structure220.

According to an embodiment, the first rear cover215and the second rear cover225may have a substantially symmetrical shape with reference to the folding axis A. However, the first rear cover215and the second rear cover225may not necessarily have a mutually symmetrical shape, and in another embodiment, the electronic device200may include the first rear cover215and the second rear cover225having various shapes. In another embodiment, the first rear cover215may be integrally formed with the first housing structure210, and the second rear cover225may be integrally formed with the second housing structure220.

According to an embodiment, the first rear cover215, the second rear cover225, the first housing structure210, and the second housing structure220may form a space in which various components (e.g., a printed circuit board or a battery) of the electronic device200can be arranged. According to an embodiment, one or more components may be arranged or may be visually exposed on the rear surface of the electronic device200. For example, at least a part of a sub display may be visually exposed through a first rear area216of the first rear cover215. In another embodiment, one or more components or sensors may be visually exposed through a second rear area226of the second rear cover225. In an embodiment, the sensor may include a proximity sensor and/or a rear camera.

According to an embodiment, a front camera exposed on the front surface of the electronic device200or the rear camera exposed through the second rear area226of the second rear cover225may include one lens or multiple lenses, an image sensor, and/or an image signal processor. For example, a flash may include a light-emitting diode or a xenon lamp. In some embodiments, two or more lenses (an infrared camera, a wide-angle lens, and a telephoto lens) and image sensors may be arranged on one surface of the electronic device200.

Referring toFIG.3, a hinge cover (e.g., the hinge cover232ofFIG.4) included in the hinge structure230may be disposed between the first housing structure210and the second housing structure220, and may be configured to cover an internal component (e.g., the hinge plate231). According to an embodiment, the hinge structure230may be configured to be covered by a part of the first housing structure210and the second housing structure220or to be exposed to the outside, according to a state (an unfolded state (status), an intermediate state (status), or a folded state (status)) of the electronic device200.

According to an embodiment, as illustrated inFIG.2, when the electronic device200is in an unfolded state (e.g., a fully unfolded state (status)), the hinge structure230may be covered by the first housing structure210and the second housing structure220not to be exposed. As another example, as illustrated inFIG.3, when the electronic device200is in a folded state (e.g., a fully folded state (status)), the hinge structure230may be exposed to the outside, between the first housing structure210and the second housing structure220. As another example, when the first housing structure210and the second housing structure220are in an intermediate state (status) which is folded with a certain angle, the hinge structure230may be partially exposed to the outside, between the first housing structure210and the second housing structure220. However, in an embodiment, the exposed area may be smaller than that in the fully folded state. In an embodiment, the hinge structure230may include a curved-surface.

According to an embodiment, the display250may be disposed in a space formed by the foldable housing201. For example, the display250may be seated in a recess formed by the foldable housing201and may be seen from the outside through the front surface of the electronic device200. For example, the display250may be configured to form most of the front surface of the electronic device200. Accordingly, the front surface of the electronic device200may include the display250, and a partial area of the first housing structure210and a partial area of the second housing structure220, which are adjacent to the display250. In addition, the rear surface of the electronic device200may include the first rear cover215, a partial area of the first housing structure210adjacent to the first rear cover215, the second rear cover225, and a partial area of the second housing structure220adjacent to the second rear cover225.

According to an embodiment, the display250may mean a display at least a partial area of which can be deformed into a flat-surface or a curved-surface. According to an embodiment, the display250may include a folding area253, a first area251disposed at a side (e.g., the left side of the folding area253illustrated inFIG.2) with reference to the folding area253, and a second area252disposed at the other side (e.g., the right side of the folding area253illustrated inFIG.2).

However, in an embodiment, the division of the area of the display250illustrated inFIG.2may be exemplary, and the display250may be divided into multiple (e.g., four or more, or two) areas according to a structure or a function thereof. For example, in the embodiment illustrated inFIG.2, the area of the display200may be divided by a folding area203extending parallel to the folding axis A, but in another embodiment, the area of the display200may be divided with reference to another folding axis (e.g., a folding axis parallel to the width direction of the electronic device).

According to an embodiment, the display250may be coupled to or disposed adjacent to a touch panel provided with a touch sensing circuit and a pressure sensor capable of measuring the intensity (pressure) of a touch. For example, the display250may be an example of a touch panel, and may be coupled to or disposed adjacent to a touch panel configured to detect an electromagnetic resonance (EMR) type stylus pen.

According to an embodiment, the first area251and the second area252may have an overall symmetrical shape with reference to the folding area253.

Hereinafter, the operation of the first housing structure210and the second housing structure220and each area of the display250according to a state (e.g., a folded state (status), an unfolded state (status), or an intermediate state (status)) of the electronic device200will be described, according to an embodiment.

According to an embodiment, when the electronic device200is in an unfolded state (status) (e.g.,FIG.2), the first housing structure210and the second housing structure220may form an angle of about 180 degrees and may be arranged to face the same direction. The surface of the first area251and the surface of the second area252of the display250may form about 180 degrees each other, and may face the same direction (e.g., the front surface direction of the electronic device). The folding area253may form the same flat surface as the first area251and the second area252.

According to an embodiment, when the electronic device200is in a folded state (status) (e.g.,FIG.3), the first housing structure210and the second housing structure220may be arranged to face each other. The surface of the first area251and the surface of the second area252of the display250may form a narrow angle (e.g., an angle between 0 degrees and 10 degrees) and thus may face each other. At least a part of the folding area253may be formed as a curved-surface having a predetermined curvature.

According to an embodiment, when the electronic device200is in an intermediate state (status), the first housing structure210and the second housing structure220may be arranged to have a certain angle. The surface of the first area251and the surface of the second area252of the display250may form an angle larger than that of a folded state and smaller than that of an unfolded state. At least a part of the folding area253may be formed as a curved-surface having a predetermined curvature, and in this case, the curvature may be smaller than that of a folded state (status).

In an embodiment and referring toFIG.2andFIG.3, a first vent hole281, a second vent hole282, first electrical component holes291, and a second electrical component hole292may be formed through the electronic device200.

According to an embodiment, the first vent hole281and the first electrical component holes291may be formed through the upper side surface of the first housing structure210. According to an embodiment, the first vent hole281may be formed closer to the hinge structure230than the first electrical component holes291.

According to an embodiment, the second vent hole282and the second electrical component hole290may be formed through the upper side surface of the second housing structure220. According to an embodiment, the second electrical component hole292may be formed closer to the hinge structure230than the second vent hole282.

According to an embodiment, in a state in which the second housing structure220is folded with respect to the first housing structure210, the second electrical component hole292formed through the second housing structure220may be disposed on the same line as the first vent hole281formed through the first housing structure210of the electronic device200in a folded state.

According to an embodiment, in a state in which the second housing structure220is folded with respect to the first housing structure210, the second vent hole282formed through the second housing structure220may be disposed on the same line as any one of the first electrical component holes291formed through the first housing structure210of the electronic device200in a folded state.

In an embodiment, the first electrical component holes291and the second vent hole282, and the first vent hole281and the second electrical component hole292may be arranged on the same line, and thus a user may feel an aesthetic feeling from the arrangement of each configuration thereof.

According to an embodiment, the first vent hole281and the second vent hole282may be formed to communicate with a closed space which is formed by a first waterproof member to fourth waterproof member (e.g., the first waterproof271to the fourth waterproof member274ofFIG.4) arranged on the front surface and rear surface of the foldable housing201, which is to be described later. The first vent hole281and the second vent hole282may be configured to allow gas to flow therethrough, and to block the inflow of liquid.

According to an embodiment, the positions of the second electrical component hole292and the second vent hole282may be changed, and the positions of the first electrical component holes291and the first vent hole281may also be configured to be changed.

FIG.4is an exploded perspective view of an electronic device200, according to an embodiment.FIG.5Ais a perspective view illustrating an electronic device200opened from a closed state to an open state, according to an embodiment.FIG.5Bis a view illustrating the shape of a cam included in the hinge structure230, according to an embodiment.

In an embodiment, the views belowFIG.4illustrate a spatial coordinate system defined by the X-axis, the Y-axis, and the Z-axis which are orthogonal to each other. Here, the X-axis may indicate the width direction of the electronic device, the Y-axis may indicate the longitudinal direction of the electronic device, and the Z-axis may indicate the height (or thickness) direction of the electronic device. In describing an embodiment, a “first direction (or third direction)” may mean a direction parallel to the +Z-axis, and a “second direction (or fourth direction)” may mean a direction parallel to the −Z-axis.

In describing the elements of the electronic device200illustrated inFIG.4, descriptions for elements described above throughFIG.2andFIG.3will be omitted within a range overlapping with the above descriptions.

According to an embodiment, the electronic device200may include various electronic components arranged in the inner space or the outer space of the first housing structure210and the second housing structure220. For example, the various electronic components may include a processor263(e.g., the processor120ofFIG.1), a memory (e.g., the memory130ofFIG.1), an input module (e.g., the input module150ofFIG.1), a sound output module (e.g., the sound output module155ofFIG.1), the display250(e.g., the display module160ofFIG.1), an audio module (e.g., the audio module170ofFIG.1), a sensor (e.g., the sensor module176ofFIG.1), an interface (e.g., the interface177ofFIG.1), a connection terminal (e.g., the connection terminal178ofFIG.1), a haptic module (e.g., the haptic module179ofFIG.1), a camera module (e.g., the camera module180ofFIG.1), a power management module (e.g., the power management module188ofFIG.1), batteries261and262(e.g., the battery189of theFIG.1), a communication module (e.g., the communication module190ofFIG.1), a subscriber identification module (e.g., the subscriber identification module196ofFIG.1), or an antenna module (e.g., the antenna module197ofFIG.1), and the electronic components may be appropriately divided to be arranged in the inner space or the outer space of the first housing structure210and the second housing structure220. In the electronic device200, at least one (e.g., the connection terminal178) of the elements may be omitted, or one or more other elements may be added. In addition, some of the elements may be integrated into one element.

According to an embodiment, the electronic device200may be a foldable electronic device, and may include multiple batteries for supplying, to electronic components, and storing power required for driving thereof. For example, a first battery261and a second battery262respectively arranged in the first housing structure210and the second housing structure220may be included therein.

According to an embodiment, the electronic device200may be a foldable electronic device, and may be provided with support members (or plates)244and245which are configured to allow components to be arranged in each of the first housing structure210and the second housing structure220. Various types of electronic components and/or printed circuit boards241and242may be arranged on the support members244and245. For example, a first support member (or a first plate)244and a first printed circuit board241may be arranged in the first housing structure210, and a second support member (or second plate)245and a second printed circuit board242may be arranged in the second housing structure220. For example, the second printed circuit board242may be a main printed circuit board on which the processor263is disposed. Signals of the processor263configured to implement various functions and operations of the electronic device200may be delivered to electronic components through various types of conductive lines243and/or connection members (connectors) formed on the printed circuit boards241and242.

According to an embodiment, the flexible display250may include a display panel (not shown). In an embodiment, the first support member243and the second support member244may be arranged between the display panel, the first printed circuit board241, and the second printed circuit board242. The hinge structure230may be disposed between the first support member243and the second support member244.

According to an embodiment, the hinge structure230may include a hinge plate and a hinge cover. The hinge cover may be configured to cover the hinge plate disposed inside the hinge structure230and hinge modules coupled thereto.

According to an embodiment, the first housing structure210and the second housing structure220may be assembled to each other to be coupled to both sides of the hinge structure230when the flexible display250is coupled to the first support member243and the second support member244. For example, the first housing structure210may be coupled by sliding from one side of the hinge structure230, and the second housing structure220may be coupled by sliding from the other side of the hinge structure230.

According to an embodiment, various members may be arranged inside the electronic device200. According to an embodiment, the various members may be arranged in the first housing structure210and/or between the first support member243and the flexible display250. According to an embodiment, the various members may be arranged in the second housing structure220and/or between the second support member244and the flexible display250. According to another embodiment, the various members may be arranged on first printed circuit board241and/or between the first housing structure210and the first rear cover215, and may be arranged on the second printed circuit board242and/or between the second housing structure220and the second rear cover225. According to an embodiment, the various members may include a waterproof member270, an adhesive member, a support member, and a buffer member.

According to an embodiment,FIG.4illustrates the multiple waterproof members270as the various members. For example, the electronic device may include a first waterproof member271, a second waterproof member272, a third waterproof member273, and a fourth waterproof member274.

According to an embodiment, the first waterproof member271may be disposed between the first support member243of the first housing structure210and a first area (e.g., the first area251ofFIG.2) of the flexible display250. According to an embodiment, the first waterproof member271may be formed as a waterproof tape. The first waterproof member271may be adhered to the first housing structure and/or the first support member243, and may be adhered to the flexible display250. The first waterproof member271may be formed as a closed curve. The first waterproof member271formed as a closed curve may include at least one area. As the first waterproof member271is formed as a waterproof tape and includes at least one area formed as a closed curve, it may be possible to prevent liquid from flowing into the inside of the closed curve from the outside of the closed curve of the first waterproof member271.

According to an embodiment, the second waterproof member272may be disposed between the second support member244of the second housing structure220and a second area (e.g., the second area252ofFIG.2) of the flexible display250. According to an embodiment, the second waterproof member272may be formed as a waterproof tape. The second waterproof member272may be adhered to the second housing structure220and/or the second support member244, and may be adhered to the flexible display250. The second waterproof member272may be formed as a closed curve. The second waterproof member272formed as a closed curve may include at least one area. As the second waterproof member272is formed as a waterproof tape and includes at least one area formed as a closed curve, it may be possible to prevent liquid from flowing into the inside of the closed curve from the outside of the closed curve of the second waterproof member272.

According to an embodiment, the first waterproof member271and the second waterproof member272may be arranged not to be in contact with the hinge structure230. According to an embodiment, the third waterproof member273may be disposed between the first housing structure210and the first rear cover215. According to an embodiment, the third waterproof member273may be formed as a bond and/or a waterproof tape. The third waterproof member273may be adhered to the first housing structure210, and may be adhered to the first rear cover215. The third waterproof member273may be formed as a closed curve. The third waterproof member273formed as a closed curve may include at least one area. As the third waterproof member273is formed as a waterproof tape and includes at least one area formed as a closed curve, it may be possible to prevent liquid from flowing into the inside of the closed curve from the outside of the closed curve of the third waterproof member273.

According to an embodiment, the fourth waterproof member274may be disposed between the second housing structure220and the second rear cover225. According to an embodiment, the fourth waterproof member274may be formed as a waterproof tape. The fourth waterproof member274may be adhered to the second housing structure the220, and may be adhered to at least a part of the second rear cover225. The fourth waterproof member274may be formed as a closed curve. The fourth waterproof member274formed as a closed curve may include at least one area. As the fourth waterproof member274is formed as a bond and includes at least one area formed as a closed curve, it may be possible to prevent liquid from flowing into the inside of the closed curve from the outside of the closed curve of the fourth waterproof member274.

In an embodiment, as the waterproof member270is disposed inside the electronic device200, it is possible to prevent liquid from flowing into the inside of the electronic device200from the outside of the electronic device200.

In addition, in an embodiment, at least one of various members (e.g., an adhesive member, a support member, and/or a buffer member) may be arranged inside the electronic device200.

In an embodiment and referring toFIG.4andFIG.5Atogether, in a foldable electronic device which is very frequently opened or closed and has a foldable display, an automatic opening module300may be provided to provide user convenience.

According to an embodiment, the automatic opening module300may include a first magnetic body part310which is disposed at a position adjacent to a side edge of the first housing structure210and includes magnetic bodies arranged along the longitudinal direction (e.g., the Y-axis direction) of the first housing structure210, and a second magnetic body part320which is disposed at a position adjacent to a side edge of the second housing structure220and a position corresponding to the first magnetic body part310and includes magnetic bodies arranged along the longitudinal direction (e.g., Y-axis direction) of the second housing structure220.

In an embodiment, at least one of the first magnetic body part310and the second magnetic body part320may be formed as a movable magnetic body module including a shape memory alloy (SMA) member capable of being deformed or restored along the longitudinal direction (e.g., the Y-axis direction) of the electronic device. For example, as illustrated inFIG.4, the first magnetic body part310may be formed as a movable magnetic body module. In the case, as illustrated inFIG.4, the second magnetic body part320may be provided as a stationary magnetic body, or as will be described later throughFIG.12, the second magnetic body part320may also be formed as a movable magnetic body module.

According to an embodiment, the first magnetic body part310, in the first housing structure210, may be disposed at a position adjacent to a first side surface (e.g., the first side surface211aofFIG.2) which is parallel to and spaced apart from the hinge structure230, for example, the space between the first battery261and the first housing structure210. In addition, the second magnetic body part320, in the second housing structure220, may be disposed at a position adjacent to a second side surface (e.g., the second side surface221aofFIG.2) which is parallel to and spaced apart from the hinge structure230, for example, the space between the second battery262and the second housing structure220.

In an embodiment and referring toFIG.5AandFIG.5Btogether, when the electronic device is changed from a closed state (e.g., the left view ofFIG.5A) to an open state (e.g., the right view ofFIG.5A), the electronic device200may be configured to use the automatic opening module300including a shape memory alloy member, and thus may be configured to implement an easy-opening operation of automatically opening the first housing structure210and the second housing structure220of the electronic device200by a predetermined angle θ (or a predetermined distance), thereby improving user convenience. According to an embodiment, the predetermined angle θ may be an angle designated by the hinge structure230provided with cams231and232which have surfaces facing each other, each of the surfaces having a valley portion and a mounting portion which correspond to each other. Referring toFIG.5A, when the electronic device200is in a closed state, the first magnetic body part310and the second magnetic body part320may be configured to generate attractive force to each other, and when the electronic device200is changed into an open state, the automatic opening module300including the shape memory alloy may be used to move at least one magnetic body array in one direction, thereby removing the attractive force between the first magnetic body part310and the second magnetic body part320. In the case, the angle between the first housing structure210and the second housing structure220of the electronic device200may be opened by the predetermined angle θ by driving force of the hinge structure230and/or repulsive force of the flexible display250.

According to an embodiment, when being changed into an open state, the automatic opening module300including the shape memory alloy member may be used to change the polarity of the magnetic body array, and thus attractive force between the first magnetic body part310and the second magnetic body part320is removed and repulsive force is generated between the first magnetic body part310and the second magnetic body part320, so that the housing structures can be opened by an angle greater than the predetermined angle θ.

FIG.6is a view illustrating a movable magnetic body module, according to an embodiment.FIG.7is a view illustrating a magnetic body array having a Halbach arrangement, according to an embodiment.FIG.8AtoFIG.8Care views showing an operation of an automatic opening module before feeding and after feeding, according to an embodiment.

According to an embodiment and referring toFIG.6toFIG.8Ctogether with the drawings described above, the automatic opening module300included in the electronic device according to an embodiment will be described in more detail.

In an embodiment, and as describe above throughFIG.4, at least one of the first magnetic body part310and the second magnetic body part320may be formed as a movable magnetic body module including a shape memory alloy member capable of being deformed or restored along the longitudinal direction (e.g., the Y-axis direction) of the electronic device. For example, when the first magnetic body part310is formed as a movable magnetic body module, the second magnetic body part320may be formed as a stationary magnetic body, and on the contrary thereto, when the first magnetic body part310is formed as a stationary magnetic body, the second magnetic body part320may be formed as a movable magnetic body module. As another example, both the first magnetic body part310and the second magnetic body part320may be formed as a movable magnetic body module.

In the following drawings (e.g.,FIG.6toFIG.9), the structure and the operation method of the automatic opening module300will be described according to an embodiment in which the first magnetic body part310is formed as a movable magnetic body module and the second magnetic body part320is formed as a stationary magnetic body. Hereinafter, the first magnetic body part310may be referred to as a “movable magnetic body module310”, and the second magnetic body part320may be referred to as a “stationary magnetic body320”.

According to an embodiment, the movable magnetic body module310may include a magnetic body array311, a support body312provided at a side of the magnetic body array311, a shape memory alloy member capable of being contracted or relaxed in a state of being at least partially supported to the support body312, and a spring315configured to restore the movable magnetic body module.

In an embodiment, the magnetic body array311of the movable magnetic body module310may be formed by multiple permanent magnets which are successively connected to each other in one direction (e.g., the longitudinal direction (e.g., the Y-axis direction) of the electronic device200), and the multiple permanent magnets may be arranged such that the directions of the magnetic fields, which are formed between the magnets adjacent to each other, are different. In this case, the number of the arrayed magnets may not be limited. According to an embodiment, the stationary magnetic body320may also include a magnetic body array321corresponding to the magnetic body array311of the movable magnetic body module310. The fact that the magnetic body array321of the stationary magnetic body320corresponds to the magnetic body array311of the movable magnetic body module310may mean that the numbers of the successively connected permanent magnets are the same and the magnetic body arrays are formed to have the same total length.

In an embodiment and referring toFIG.7, the magnetic body array311may be formed such that a series of permanent magnets form a Halbach arrangement in which a weak magnetic field is generated in one direction and a strong magnetic field is generated in the other direction. According to an embodiment, when the magnetic body array311(hereinafter, may be referred to as a “first magnetic body array311”) of the movable magnetic body module310forms a Halbach arrangement, the magnetic body array321(hereinafter, may be referred to as a “second magnetic body array321”) of the stationary magnetic body320may also form a Halbach arrangement. For example, referring toFIG.7, the first magnetic body array311may include multiple first poles311aconfigured to form a magnetic field in a direction perpendicular to the longitudinal direction of the first magnetic body array311and multiple second poles311bconfigured to form a magnetic field in a direction parallel to the longitudinal direction thereof, and the multiple first poles311aand the multiple second poles311bmay be arranged to alternately generate a strong magnetic field and generate also a strong magnetic field toward one surface (e.g., the downward direction ofFIG.7) of the first magnetic body array311. The second magnetic body array321may include multiple third poles321aconfigured to form a magnetic field in a direction perpendicular to the longitudinal direction of the second magnetic body array321and multiple fourth poles321bconfigured to form a magnetic field in a direction parallel to the longitudinal direction thereof, and the multiple third poles321aand the multiple fourth poles321bmay be arranged to alternately generate a strong magnetic field and generate also a strong magnetic field toward one side (e.g., the upward direction ofFIG.7) of the second magnetic body array321. As illustrated inFIG.7, in a state where one ends and the other ends of the first magnetic body array311and the second magnetic body array321are aligned with each other and magnets of thereof are arranged to face one to one, when the first poles311aof the first magnetic body array311and the third poles321aof the second magnetic body array321are directed in the same direction, and the second poles311bof the first magnetic body array311and the fourth poles321bof the second magnetic body array321are directed in different directions, attractive force may be applied between the magnetic body arrays311and321. As described above, as the magnetic body arrays311and321are formed in a Halbach arrangement, the space (or area), which is occupied by the magnetic body arrays311and321in the inner space of the electronic device200, may be minimized, and the maximum magnetic force may be generated.

In an embodiment and referring again toFIG.6, the support body312may be a portion having a long body in the same direction as the direction in which the magnetic body array311extends, and for example, may have a function such as a bracket for the magnetic body array311and the shape memory alloy member.

In an embodiment, the shape memory alloy member may have a configuration in which the arrangement of crystals thereof can be deformed according to a temperature or restored to the original shape after deformation. According to an embodiment, for example, the shape memory alloy member may include a shape memory alloy wire313. The shape memory alloy wire313may be contracted or relaxed according to a temperature so that the total length thereof is changed. As illustrated in the drawings, the shape memory alloy wire313may be provided with multiple wires313aand313b. At least a part of the shape memory alloy wire313may be supported by the support body312.

According to an embodiment, a part of the shape memory alloy wire313may be configured to surround the support body312, and other parts thereof may be formed to be fixed to other elements (e.g., the feeder267). Referring again toFIG.6, the shape memory alloy wire313may be configured such that one end and the other end thereof are connected to other elements (e.g., the feeder267) in a state of surrounding the support body312. In this state, the shape memory alloy wire313may be contracted or relaxed according to a temperature. The shape memory alloy wire313may be contracted in a high-temperature environment so that the total length thereof is shortened, and may be relaxed in a low-temperature environment so that the length thereof is restored to the original length. In connection with the movable magnetic body module310, when the shape memory alloy wire313contracts in a high-temperature environment, the support body312and the magnetic body array311may be moved in the direction in which the shape memory alloy wire313is contracted, and when the shape memory alloy wire313relaxes in a low-temperature environment, the support body312and the magnetic body array311may be moved in the direction in which the shape memory alloy wire313is relaxed.

In an embodiment, the feeder267may be the configuration for changing the temperature of the shape memory alloy wire313. The feeder267may be a configuration connected to a power supply circuit disposed in the electronic device200, and may be disposed in the longitudinal direction of the movable magnetic body module310. One end and the other end of the shape memory alloy wire313may be fixedly connected to the feeder267. The feeder267may supply power to the shape memory alloy wire so as to raise temperature of the wire.

In an embodiment, the spring315may be a configuration configured to allow the support body312and the magnetic body array311to be restored back to the original position thereof, and for example, when the shape memory alloy wire313contracts due to becoming a high-temperature, the spring may be contracted together, and when the shape memory alloy wire313is relaxed due to becoming a low-temperature, the spring may apply an elastic restoring force to the support body312and the magnetic body array311.

According to an embodiment, the movable magnetic body module310may additionally include a retaining member314. The retaining member314may be provided to limit a moving distance thereof when the support body312of the movable magnetic body module310moves in response to the contraction or relaxation of the shape memory alloy wire313.

At least one of the position, number, and shape of the spring315and/or the retaining member314may be variously applied according to an embodiment.

In an embodiment and referring toFIG.8AtoFIG.8C,FIG.8Aillustrates a movable magnetic body module310in a state before feeding or a restored (recovered) state after feeding, andFIG.8Billustrates a movable magnetic body module310in a state in which the position thereof is moved according to the contraction of a shape memory alloy wire313when feeding.FIG.8Aillustrates a state in which attractive force is applied between the first magnetic body array311of the movable magnetic body module310and the second magnetic body array321of the stationary magnetic body320.

In an embodiment, comparingFIG.8AandFIG.8B, when the feeder267supplies power to the shape memory alloy wire313so as to raise the temperature of the shape memory alloy wire313, the shape memory alloy wire313may reach a critical temperature and thus may be contracted. Therefore, the support body312and the first magnetic body array311of the movable magnetic body module310may move in a direction (e.g., the longitudinal direction (the Y-axis direction) of the electronic device200) by the contraction force of the shape memory alloy wire313. As illustrated inFIG.8B, as the movable magnetic body module310moves, the arrangement configured to allow attractive forces between the first magnetic body array311and the second magnetic body array321to be generated may be changed, and thus a change in magnetic force between the magnetic bodies may occur. For example, the state of magnetic force between the magnetic bodies may become a state in which attractive force between the first magnetic body array311and the second magnetic body array321is removed. In another embodiment, after attractive force between the first magnetic body array311and the second magnetic body array321is removed, the state of magnetic force between the magnetic bodies may become a state in which repulsive force is generated. As illustrated inFIG.8C, the electronic device200may be opened to an open state by the change in magnetic force between the magnetic bodies.

Other elements included in an electronic device200according to an embodiment will be described in more detail with reference toFIG.9andFIG.10together with the drawings described above.

FIG.9is a view illustrating an inner shape in an open state of an electronic device200, according to an embodiment.FIG.10is a view illustrating a cross section taken along the direction B-B′ in the view ofFIG.9, according to an embodiment. In describing the elements illustrated in the views ofFIG.9andFIG.10, contents overlapping with the above-described elements will be omitted.

In an embodiment and as illustrated inFIG.9, the movable magnetic body module310and the stationary magnetic body320may be respectively arranged on opposite edges of the first housing structure210and the second housing structure220of the electronic device200. The second magnetic body array321of the stationary magnetic body320may be disposed at a position corresponding to the first magnetic body array311of the movable magnetic body module310. According to an embodiment, the movable magnetic body module310may have a length longer and a volume larger than those of the stationary magnetic body320. Therefore, it may be preferable that the movable magnetic body module310is disposed in consideration of the arrangement state between the other components inside the housing of the electronic device200, but the condition may not limit the arrangement position of the movable magnetic body module310. For example, according to the embodiment illustrated inFIG.9, electronic components such as a key input device, a fingerprint sensor, and/or a camera module are arranged adjacent to the side surface of the second housing structure320, and thus the stationary magnetic body320having a relatively small volume is disposed in the second housing structure220and the movable magnetic body module310is disposed in the first housing structure210. However, it may not be necessarily limited thereto, and differently from what is illustrated in the drawing, the embodiment, in which the stationary magnetic body is disposed in the first housing structure210and the movable magnetic body module is disposed in the second housing structure220, may be applied thereto.

In an embodiment, the movable magnetic body module310disposed in the first housing structure210may include other elements including the first magnetic body array311, which are arranged to extend parallel to the longitudinal direction (e.g., the Y-axis direction) of the electronic device200(or the second housing structure220). For example, as illustrated inFIG.9andFIG.10, the magnetic body array311, the support body312, the shape memory alloy wire313, and the feeder267, which are included in the movable magnetic body module310, may be arranged to extend parallel to the longitudinal direction (e.g., the Y-axis direction) of the electronic device200(or the second housing structure220), at a position adjacent to the first side surface211a.

In an embodiment, the electronic device200may include a power supply circuit. The power supply circuit may be one of the various electronic components arranged in the inner space or the outer space of the first housing structure210and the second housing structure220, and according to an embodiment, may be disposed on the first printed circuit board241or the second printed circuit board242.

According to an embodiment, the electronic device200, as a power supply circuit thereof, may further include a circuit266configured to supply power to the shape memory alloy member and control power (hereinafter, shortly referred to as a “shape memory alloy (SMA) controller266”). The shape memory alloy member may have a temperature as an operation mechanism thereof, and may receive power supplied therefrom to generate heat. Since Joule's heat increases as power is higher, the shape memory alloy member may be controlled through controlling power by using the SMA controller266. The SMA controller266may be electrically connected to the feeder267to increase or lower current or voltage provided to the shape memory alloy member (e.g., the shape memory alloy wire313), and also to adjust the time period in which current or voltage is applied thereto. According to various embodiments, the SMA controller266may be disposed to be spaced apart from the processor263, and as illustrated inFIG.9, the SMA controller and the processor may be arranged on different printed circuit boards in different housing structures. In this case, the electrical connection with the processor263may be implemented by a conductive line disposed on the printed circuit board and/or a connection member243.

In an embodiment, the electronic device200may include various sensors (e.g., the sensor module176ofFIG.1) related to an automatic opening operation of the electronic device200.

For example, the electronic device200may include a sensor264(hereinafter, referred to as an “angle sensor264”) capable of detecting a folding angle between the first housing structure210and the second housing structure220. For example, by detecting the angle between the first housing structure210and the second housing structure220, which is detected by the angle sensor264, when the first housing structure210and the second housing structure220are opened to a predetermined angle or more, the processor263may be configured to provide current or voltage to the shape memory alloy wire313through the SMA controller266so as to stop an automatic opening operation in progress, thereby preventing unnecessary power consumption.

In another embodiment, the electronic device200may include a sensor265(hereinafter, referred to as a “temperature sensor265”) configured to detect a change in temperature of the electronic device or around the electronic device. The temperature of the electronic device200or the temperature of an environment around the electronic device200may be measured through the temperature sensor265, and the processor263, based on the temperature data, may set an optimal operating voltage to the SMA controller266so as to perform feeding to the shape memory alloy wire313.

For example, in an embodiment, the following Table is a table showing the contraction and the relaxation speed of the shape memory alloy wire313responding to an opening operation and/or a restoring operation of the electronic device when voltages (or currents) having different magnitudes are applied thereto according to temperatures of a terminal.

Referring to Table 1, immediacy may be enhanced by obtaining the temperature of the electronic device200through the temperature sensor and controlling such that the electronic device rapidly operates according to a temperature condition.

In an embodiment and referring to Table 1 above, in an opening operation, it may be identified that the contraction speed is faster as the voltage is higher. On the other hand, in a restoring operation, it may be identified that the relaxation speed is slower as the voltage is higher. Therefore, the immediacy in the speed of an opening operation and/or a restoring operation may be enhanced by applying a high-voltage thereto in the opening operation and applying a low-voltage thereto in the restoring operation. For example, the immediacy may be enhanced by differently setting voltages applied thereto according to the opening operation and the restoring operation. On the other hand, according to an embodiment, it may not be that, always, only a high-voltage is applied thereto in the case of an opening operation, it may not be that, always, only a low-voltage is applied thereto in the restoring operation, and the applied voltages may be different in consideration of a temperature condition of the electronic device200. For example, when a voltage of about 4V is applied thereto in an approximate −20° C. environment, the opening speed is about 6.3 seconds. Therefore, it may be identified that the opening speed becomes significantly faster as the applied voltage is higher (e.g., the opening speed is about 1.7 seconds when about 5V voltage is applied, and the opening speed is about 0.9 seconds when about 6V voltage is applied). On the other hand, when a voltage of about 4V is applied thereto in an approximate 60° C. environment, the opening speed is about 1.5 seconds. Although the opening speed is slightly faster as the applied voltage is higher, it may be identified that the difference therebetween is not significant (e.g., the opening speed is about 0.8 seconds when about 5V voltage is applied, and the opening speed is about 0.6 seconds when about 6V voltage is applied). Considering the tendency, a high-voltage may be applied thereto under a low-temperature, and an average voltage may be applied thereto under a high-temperature.

In another embodiment, although not illustrated in the drawings, the electronic device200may include a sensor (not shown) (hereinafter, referred to as an “acceleration sensor”) configured to detect the tilt of the electronic device200with respect to the direction of gravity. The horizontal, the vertical, the tile, etc. of the electronic device200with respect to the direction of gravity with reference to the ground may be accurately identified using the acceleration sensor, and the processor263, based on the data, may set an optimal operating voltage to the SMA controller266so as to perform feeding to the shape memory alloy wire313. An embodiment configured to detect the tilt with respect to the direction of gravity will be described later in more detail as illustrated inFIG.14AtoFIG.14F.

According to an embodiment, the electronic device200may include the above-described sensors and may be configured to control current or voltage flowing through the shape memory alloy, based on the data measured by the sensors, thereby ensuring immediacy in opening and/or restoring in various temperature environments. In addition, the electronic device may be configured to perform an appropriate control according to various tilting states and folding states of the foldable electronic device, thereby reducing the opening and/or the restoring time and power consumption thereof.

FIG.11Ais a view illustrating an array structure of a magnetic body array, according to an embodiment.FIG.11Bis a view illustrating an array structure of a magnetic body array, according to an embodiment.

In an embodiment,FIG.11AandFIG.11Billustrate two magnetic body arrays411and511having different dimensions. One magnetic body array411of the two magnetic body arrays411and511may have a length which is a length in the longitudinal direction (the Y-axis direction) of the electronic device and is formed to be relatively long, and a width which is a length in the width direction (the X-axis direction) of the electronic device and is formed to be relatively short. The other one magnetic body array511may have a length which is a length in the longitudinal direction (the Y-axis direction) of the electronic device and is formed to be relatively short, and a width which is a length in the width direction (the X-axis direction) of the electronic device and is formed to be relatively long. The one magnetic body array411may be formed by the combination of permanent magnets each having a length d and a width2h, and the other one magnetic body array511may be formed by the combination of permanent magnets each having a length2dand a width h. In this case, it may be assumed that the total area of each thereof is identical and thus each thereof provides a magnetic force having the same magnitude. When the magnetic body arrays411and511are used as the automatic opening module of the electronic device, the one magnetic body array411may have the short length d which allows attractive force to be removed when moving in the electronic device, but the other one magnetic body array511may have the length2dwhich is formed relatively long and allows attractive force to be removed when moving in the electronic device. In the magnetic body array511, it may mean that it takes more time to remove the attractive force therebetween. That is, according to the embodiment illustrated inFIG.11AandFIG.11B, an electronic device, which has the magnetic body array511used as the automatic opening module, may have an operating speed slower that the operating speed of an electronic device using the magnetic body array411.

In an embodiment, in order to ensure immediacy, the electronic device array (e.g., the magnetic body array411) having a length which is a length in the longitudinal direction (the Y-axis direction) of the electronic device and is formed to be relatively long and having a length which is a length in the width direction (the X-axis direction) of the electronic device and is formed to be relatively short, may be adopted as a magnetic body array according to various embodiments of the disclosure.

FIG.12Ais an enlarged view of a portion of a support body312included in a movable magnetic body module310, according to an embodiment.FIG.12Bis a view showing a state in which a shape memory alloy wire313is seated on a support body312, according to an embodiment.

In an embodiment, seating parts312aand312bmay be formed on a surface of the support body312, and the wire313may be contracted or may be relaxed, and the wire313deformed in a state in which at least a portion of the wire313is seated in or accommodated in the seating parts312aand312b. According to an embodiment, the seating parts312aand312bmay include a recess formed on the side surface of the support body312.

In an embodiment and referring toFIG.12AandFIG.12B, another method for securing immediacy in an opening operation and/or a restoring operation by using the automatic opening module of the electronic device may be disclosed. According to an embodiment, multiple shape memory alloy wires313may be used therefor. When the multiple shape memory alloy wires313are used, the force pulling the support body312and the magnetic body array311may be distributed to each of the wires, thereby reducing the diameter of each of the wires.

According to an embodiment, in the case where the diameter of each of the wires is reduced, a surface area to density thereof may be increased and thus the contraction speed or the relaxation/deformation speed of the wires according to a temperature change may be increased, thereby enhancing immediacy in an operation. According to an embodiment, as illustrated inFIG.12B, the multiple wires may be arranged to have distances therebetween, each of which is greater than the diameter of each of the wires to minimize influence between adjacent wires. For example, when the multiple shape memory alloy wires are formed in a combined (e.g., twist) form, the effect of shape deformation according to temperature change may be reduced. Therefore, as illustrated inFIG.12B, it may be preferable that the wires are separate from each other. The following Table shows various combinations of the shape memory alloy wires, and it is possible to identify the differences in the contraction speed and the relaxation speed according to each of the combinations.

In an embodiment, Table 2 above is a table showing comparison between the speeds during contraction and the speeds during relaxation, according to an embodiment, in which one shape memory alloy wire having a diameter of about 250 μm is applied thereto, an embodiment in which two shape memory alloy wires, each of which has a diameter of about 125 μm and which are combined, are applied thereto, and an embodiment in which two shape memory alloy wires, each of which has a diameter of about 125 μm and which are separated, are applied thereto. Since the shape memory alloy has a movement mechanism contracted and relaxed by heat as a parameter, the speed during contraction and the speed during relaxation may have a trade-off relationship with each other according to the size relation of the diameter.

When taking this into account, according to an embodiment, as a method for improving usability of the automatic opening module of the electronic device, an embodiment for significantly improving the speed during relaxation may be applied thereto although having somewhat disadvantage in the speed during contraction. For example, referring to Table 2, in the case where one shape memory alloy wire having a diameter of about 250 μm is applied thereto, it may be identified that the speed during contraction is the fastest, but the speed during relaxation is about 7 seconds or more. In the case of an electronic device to which the one shape memory alloy wire having a diameter of about 250 μm is applied, it may mean that it takes 7 seconds or more in the process of restoring (e.g., closed) after opening (e.g., open). Referring again to Table 2, under the same temperature condition, an embodiment, to which one shape memory alloy wire having a large diameter is applied, may have a speed during relaxation faster than that of an embodiment to which two combined shape memory alloy wires are applied. Furthermore, it may be identified that an embodiment, to which two separated shape memory alloy wires are applied, has the fastest speed during relaxation. The speed during contraction according to an embodiment, to which two shape memory alloy wires each having a diameter of about 125 μm are applied, may take longer by approximately 0.8 seconds to about 0.9 seconds than that of an embodiment to which one shape memory alloy wire having a diameter of about 250 ums is applied. However, the speed during relaxation may be reduced by approximately about 2 seconds to about 5 seconds or more. When taking this into account, according to an embodiment, two wires having a small diameter may be used instead of using one wire having a large diameter, and although two wires having a small diameter are applied thereto, the separated shape may be applied instead of a combined shape, thereby enhancing immediacy in the opening speed and/or the restoring speed of the electronic device.

AlthoughFIG.12AandFIG.12Billustrate two wires as multiple wires, it should be noted that embodiments including three, or four or more wires are also applied thereto.

FIG.13Ais a view illustrating automatic opening modules300, according to an embodiment.FIG.13Bis a view illustrating automatic opening modules300′, according to an embodiment.

In an embodiment and referring toFIG.13AandFIG.13B, the automatic opening modules300and300′ may include at least one movable magnetic body module. The automatic opening module may include the shape memory alloy member, the support body312to which the shape memory alloy member may be caught and supported, the spring315capable of restoring the movable magnetic body module back to the original position thereof, and one pair of magnetic body arrays which may influence each other through attractive force and repulsive force.FIG.13Aillustrates an embodiment provided with one movable magnetic body module310and one stationary magnetic body320, andFIG.13Billustrates an embodiment provided with one pair of movable magnetic body modules310and320. Referring toFIG.13B, when the movable magnetic body module is provided as one pair, the magnetic body arrays311and321may be arranged at positions corresponding to each other, and other elements may be arranged to face opposite directions. For example, the first support body312, the shape memory alloy wire313, the spring315, and the feeder267of the first movable magnetic body module310may be arranged to face the longitudinal direction (e.g., the Y-axis direction) of the electronic device (e.g., the electronic device200ofFIG.9), and the second support body322, the shape memory alloy wire323, the spring325, and the feeder268of the second movable magnetic body module320may be arranged to face a direction opposite to the longitudinal direction (e.g., a direction opposite to the Y-axis) of the electronic device (e.g., the electronic device200ofFIG.9). As illustrated inFIG.13B, when the automatic opening module300′ is configured as one pair of movable magnetic body modules, the contraction and relaxation operations by using the shape memory alloy member may be simultaneously operated in one direction (e.g., the Y-axis direction) and in the opposite direction (e.g., a direction opposite to the Y-axis), respectively. Therefore, the speed of the opening operation and/or the restoring operation may be faster so that it is advantageous to secure immediacy.

FIG.14AtoFIG.14Fare views illustrating various folded states of an electronic device and the tilt thereof with respect to the direction of gravity, according to an embodiment.

In an embodiment, a foldable electronic device200capable of being carried by a user, may be positioned in various states according to a user's grip state differently from laptop computers. In addition, different gravities may be applied thereto depending on the tilting state of the electronic device, and thus the hinge driving force for opening a terminal may vary according to the tilting state of the electronic device.

Therefore, according to an embodiment, the degree of tilt of the electronic device may be sensed using a sensor (e.g., the acceleration sensor) capable of detecting the tilt thereof, the positioning of a terminal may be determined based on the sensed tilt, and then a voltage may be changed and then supplied to respond to the change of the hinge driving force due to the influence of gravity, thereby preventing malfunction and reducing power consumption.

In an embodiment and as illustrated inFIGS.14A and14B, considering the direction of gravity G, when the electronic device200is positioned in a horizontal direction with respect to the ground, it may be determined that the hinge driving force required to open the electronic device200is great, and thus a voltage higher than an average voltage may be supplied thereto in order for rapid opening thereof.

In an embodiment, as illustrated inFIGS.14C,14D, and14E, considering the direction of gravity G, when the electronic device200is positioned in a vertical direction with respect to the ground, it may be determined that the hinge driving force required to open the electronic device200is small, and thus a voltage lower than an average voltage may be supplied thereto.

In an embodiment, as illustrated inFIG.14F, considering the direction of gravity G, when the electronic device200is obliquely tilted with respect to the ground, it may be determined that the hinge driving force required to open the electronic device200is smaller than those ofFIGS.14A and14Band greater than those ofFIGS.14C,14D, and14E, and thus an average voltage may be supplied thereto.

According to an embodiment, data on the degree of tilt of the electronic device may change in real time, and thus it may be necessary to obtain and correct data for a predetermined time period. Accordingly, the processor (e.g., the processor120ofFIG.1) may accumulate data for a predetermined time before feeding to the shape memory alloy member, and may perform a correction by using various algorithms. In this case, according to an embodiment, when feeding is performed to the shape memory alloy member, the processor may be configured such that power is gradually applied thereto so as to control the temperature rise speed thereof, thereby preventing a sudden operation thereof. Therefore, the load, to which the shape memory alloy member can be subjected due to the rapid operation thereof, may be reduced to prevent shortening of life.

FIG.15is a flowchart of a control method of a foldable electronic device (e.g., the foldable electronic device200ofFIG.4), according to an embodiment.

According to an embodiment, a control method of a foldable electronic device including the processor and the automatic opening module (e.g., the automatic opening module300ofFIG.4) configured to perform an opening operation of the first housing structure with respect to the second housing structure, by using the shape memory alloy member (e.g., the shape memory alloy member313FIG.6) disposed in at least one of the first housing structure (e.g., the first housing structure210ofFIG.9) or the second housing structure (e.g., the second housing structure220ofFIG.9), may be provided.

Each of the operations, according to an embodiment illustrated inFIG.15, may be performed by the processor (e.g., the processor263ofFIG.9). Each of operations illustrated inFIG.15, as an example thereof, may be described through an embodiment in which the movable magnetic body module (e.g., the movable magnetic body module310ofFIG.9) and the stationary magnetic body (e.g., the stationary magnetic body320ofFIG.9) are respectively arranged in the first housing structure210and second housing structure220, and when the foldable electronic device is closed (e.g., the closed state ofFIG.3), attractive force is applied between the movable magnetic body module310and the stationary magnetic body320. It should be noted that each of operations illustrated inFIG.15may be also applied to other various embodiments falling within the scope of the disclosure.

In an embodiment, in relation to operation1501, an opening request for the foldable electronic device may be input. The “opening request” may include various embodiments. For example, the “opening request” may correspond to an input to the electronic device (e.g., an execution of an application and/or an input to a key input device such as a button) by a user, or an electronic device opening operation algorithm pre-stored in the electronic device.

In an embodiment and in relation to operation1503, for example, when the opening request is inputted, the processor may obtain information on at least one element among the temperature of or around the electronic device, the tile of the electronic device with respect to the direction of gravity, and/or the folded state of the electronic device, from the sensor capable of detecting the folding angle of the electronic device (e.g., the angle sensor264ofFIG.9), the sensor (e.g., the temperature sensor265ofFIG.9) capable of detecting a change in temperature of or around the electronic device, and/or the sensor (not shown) capable of detecting the tilt of the electronic device with respect to the direction of gravity.

In an embodiment and in relation to operation1505, the processor may perform first feeding, based on at least one element among the temperature of or around the electronic device, the tilt of the electronic device with respect to the direction of gravity, and the folded state of the electronic device. Here, the “first feeding” may mean controlling power supplied to the shape memory alloy (SMA) member (e.g., the shape memory alloy wire513ofFIG.6) in the opening operation, and/or the supply time period of power.

In an embodiment and in relation to operation1507, when the first feeding is performed to the shape memory alloy wire513, the shape memory alloy wire513may be contracted so that the movable magnetic body module310moves, and thus attractive force applied between the movable magnetic body module310and the stationary magnetic body320may be removed. According to an embodiment, the attractive force may be removed according to the amount of movement of the movable magnetic body module310, and also repulsive force may be applied between the movable magnetic body module310and the stationary magnetic body320. When attractive force between the movable magnetic body module310and the stationary magnetic body320is removed, alternatively or additionally, by the repulsive force of the flexible display250, the first housing structure210and the second housing structure220may be automatically opened without any additional force by a user. Summarizing operations1501to1507, when only the opening request is input, the foldable electronic device according to various embodiments may be configured to implement an easy-opening operation of automatically opening the first housing structure210and the second housing structure220by a predetermined angle θ (or a predetermined distance), thereby improving user convenience.

In an embodiment, the foldable electronic device200may perform a restoring operation following the opening operation, or through an input separated from the opening operation.

In relation to operation1509, a restoring request for the foldable electronic device may be input. The “restoring request” may include various embodiments. For example, the “restoring request” may correspond to an input to the electronic device (e.g., an execution of an application and/or an input to a key input device such as a button) by a user, or an electronic device restoring operation algorithm pre-stored in the electronic device. For another example, the restoring operation algorithm may include an algorithm configured to be automatically performed after a predetermined time elapses after the electronic device is opened according to operation1507.

In an embodiment and in relation to operation1511, for example, when the restoring request is inputted, the processor may obtain information on at least one element among the temperature of or around the electronic device, the tile of the electronic device with respect to the direction of gravity, and/or the folded state of the electronic device, from the sensor capable of detecting the folding angle of the electronic device (e.g., the angle sensor264ofFIG.9), the sensor (e.g., the temperature sensor265ofFIG.9) capable of detecting a change in temperature of or around the electronic device, and/or the sensor (not shown) capable of detecting the tilt of the electronic device with respect to the direction of gravity.

In an embodiment and in relation to operation1513, the processor may perform second feeding, based on at least one element among the temperature of or around the electronic device, the tilting state of the electronic device with respect to the direction of gravity, and the folding state of the electronic device. Here, the “second feeding” may mean controlling power supplied to the shape memory alloy member513in the restoring operation, and/or the supply time period of power. The second feeding may be different from the aforementioned first feeding. For example, as described above through Table 1, it may be identified that in the opening operation, the contraction speed of the wire is faster as the voltage is higher, and it may be identified that in the restoring operation, the relaxation speed of the wire is slower as the voltage is higher. Considering that the wire is relaxed in the restoring operation, a voltage (or current), which is a level different from that in the first feeding, may be applied thereto.

In an embodiment and in relation to operation1515, when the second feeding is performed to the shape memory alloy wire513, the shape memory alloy wire513may be relaxed so that the movable magnetic body module310may move. According to an embodiment, the “restoring operation” of the foldable electronic device200may mean an operation of restoring the electronic device from an open state (e.g., the open state of theFIG.2, or the open state of theFIG.5A) to a closed state (e.g., the closed state of the. FIG.3). However, the invention is not limited thereto, and according to another embodiment, it may mean that only the movable magnetic body module310returns to the original state according to the relaxation of the shape memory alloy wire513. For example, the restoring of the electronic device from an open state to a closed state may mean restoring to a state in which the side surface (e.g., the first side surface211ainFIG.9) of the first housing structure210and the side surface (e.g., the second side surface221aofFIG.9) of the second housing structure220are in contact with each other by attractive force applied between the movable magnetic body module310and the stationary magnetic body module320. In another embodiment, the restoring of only the movable magnetic body module310to the original state may mean restoring to a state in which the first housing structure210and the second housing structure220are not in contact with each other although the movable magnetic body module310is restored to the original position. According to an embodiment, by “being restored” according to operation1515, the foldable electronic device200may become a closed state in which the first housing structure210and the second housing structure220are in contact with each other. In another embodiment, the foldable electronic device may become a state in which the foldable electronic device can be easily closed by the user (e.g., a state in which attractive force may be applied between the movable magnetic body module310and the stationary magnetic body320) although the first housing structure210and the second housing structure220of the foldable electronic device200are not in contact with each other.

According to an embodiment, a foldable electronic device may be provided, wherein the foldable electronic device (e.g., the foldable electronic device200ofFIG.4) includes a hinge structure (e.g., the hinge structure230ofFIG.4), a first housing structure (e.g., the first housing structure210ofFIG.4) connected to the hinge structure, a second housing structure (e.g., the second housing structure220ofFIG.4) connected to the hinge structure and configured to be foldable with respect to the first housing structure around the hinge structure, a foldable display (e.g., the foldable display250ofFIG.2) disposed on a surface of the first housing structure and a surface of the second housing structure, a first magnetic body part (e.g., the first magnetic body part310ofFIG.4) including a magnetic body which is disposed at a position adjacent to a side edge of the first housing structure and arranged along the longitudinal direction of the first housing structure, a second magnetic body part (e.g., the second magnetic part320ofFIG.4) including a magnetic body which is disposed at a position adjacent to a side edge of the second housing structure and at a position corresponding to the first magnetic body part and arranged along the longitudinal direction of the second housing structure, and a power supply circuit (e.g., the shape memory alloy (SAM) controller266ofFIG.9), wherein at least one of the first magnetic body part or the second magnetic body part is electrically connected to the power supply circuit and formed as a movable magnetic body module including a shape memory alloy member capable of being deformed and restored along the longitudinal direction of the electronic device.

According to an embodiment, the movable magnetic body module may include a magnetic body array (e.g., the magnetic body array311ofFIG.6), a support body (e.g., the support body312ofFIG.6) provided at a side of the magnetic body array, a shape memory alloy wire (e.g., the shape memory alloy wire313ofFIG.6) which is electrically connected to the power supply circuit and is capable of being contracted or relaxed in a state where at least a part thereof is supported to the support body, and a spring (e.g., the spring315ofFIG.6) configured to restore the movable magnetic body module.

According to an embodiment, a feeder (e.g., the feeder267ofFIG.6), which is disposed in the longitudinal direction of the movable magnetic body module to be connected to the shape memory alloy wire, may be included therein.

According to an embodiment, the magnetic body array may include a Halbach arrangement (e.g., the Halbach arrangement ofFIG.7).

According to an embodiment, the shape memory alloy wire may be formed to be seated in a recess (e.g., the seating parts312aand312bofFIG.12B) formed on a side surface of the support body.

According to an embodiment, the shape memory alloy wire may include multiple wires arranged to be parallel to each other along the longitudinal direction of the movable magnetic body module.

According to an embodiment, the distance between the multiple wires may be formed to be greater than the diameter of each of the wires.

According to an embodiment, the first magnetic body part and the second magnetic body part may be respectively formed as movable magnetic body modules (e.g., the movable magnetic body modules310and320ofFIG.13B) arranged to face directions opposite to each other.

According to an embodiment, a first battery (e.g., the first battery261ofFIG.9) may be included in the inner space of the first housing structure, the first magnetic body part may be disposed in a space between the first battery and the first housing structure, a second battery (e.g., the second battery262ofFIG.9) may be included in the inner space of the second housing structure, and the second magnetic body part may be disposed in a space between the second battery and the second housing structure.

According to an embodiment, a sensor (e.g., the sensor264ofFIG.9) capable of detecting a folding angle between the first housing structure and the second housing structure may be further included therein.

According to an embodiment, a sensor capable of detecting tilting of the electronic device with respect to the direction of gravity may be further included therein.

According to an embodiment, a sensor (e.g., the sensor265ofFIG.9) configured to detect a temperature change of the electronic device or around the electronic device may be further included therein.

According to an embodiment, a processor (e.g., the processor263ofFIG.9) may be further included therein, wherein the processor may be configured to adjust the magnitude of power and/or a supply time period of power supplied to the shape memory alloy member, based on at least one element of a temperature of or around the electronic device, the tilting state of the electronic device with respect to the direction of gravity, and the folding state of the electronic device.

According to an embodiment, a control method of a foldable electronic device may be provided, wherein the control method of a foldable electronic device includes a first housing structure and a second housing structure foldable with respect to the first housing structure, and includes a processor and an automatic opening module configured to perform an opening operation of the first housing structure with respect to the second housing structure, by using a magnetic body part disposed in each of the first housing structure and the second housing structure and a shape memory alloy member disposed in at least one of the first housing structure or the second housing structure, wherein the processor is configured to adjust power and/or a supply time period of power supplied to the shape memory alloy member, based on at least one element of a temperature of or around the electronic device, the tilting state of the electronic device with respect to the direction of gravity, and the folding state of the electronic device.

According to an embodiment, the magnetic body part may include a magnetic body array having a Halbach arrangement, the processor may be configured to supply power for moving the shape memory alloy member such that attractive force between the magnetic body parts respectively arranged in the first housing structure and the second housing structure is removed.

According to an embodiment, a foldable electronic device (e.g., the foldable electronic device200ofFIG.4) may be provided, wherein the foldable electronic device may include a hinge structure (e.g., the hinge structure230ofFIG.4) configured to form a folding axis, a first housing structure (e.g., the first housing structure210ofFIG.4) which is connected to the hinge structure to be rotatable around the folding axis and includes a first surface configured to face a first direction (e.g., the +Z direction ofFIG.4), a second surface configured to face a second direction (e.g., the −Z direction ofFIG.4) opposite to the first direction, and a first side surface (e.g., the first side surface211aofFIG.9) disposed to be parallel to and spaced apart from the folding axis of the hinge structure, between the first surface and the second surface, a second housing structure (e.g., the second housing structure220ofFIG.4) which is connected to the hinge structure to be rotatable around the folding axis and includes a third surface configured to face a third direction (e.g., the +Z direction ofFIG.4), a fourth surface configured to face a fourth direction (e.g., the −Z direction ofFIG.4) opposite to the third direction, and a second side surface (e.g., the second side surface221aofFIG.9) disposed to be parallel to and spaced apart from the folding axis of the hinge structure, between the third surface and fourth surface, a foldable display (e.g., the foldable display250ofFIG.2) disposed on a surface of the first housing structure and a surface of the second housing structure, a power supply circuit (e.g., the SMA controller266ofFIG.9), a movable magnetic body module (e.g., the movable magnetic body module310ofFIG.9) including a magnetic bodies which are arranged at a position adjacent to the first side surface of the first housing structure and arranged along the longitudinal direction of the first housing structure, and a shape memory alloy member which is electrically connected to the power supply circuit and is capable of being deformed or restored along the longitudinal direction of the electronic device, and a stationary magnetic body (e.g., the stationary magnetic body320ofFIG.9) disposed at a position adjacent to a second side surface of the second housing structure and at a position corresponding to the first magnetic body part and arranged along the longitudinal direction of the second housing structure.

According to an embodiment, the movable magnetic body module may include a magnetic body array (e.g., the magnetic body array311ofFIG.6), a support body (e.g., the support body312ofFIG.6) provided at a side of the magnetic body array, a shape memory alloy wire (e.g., the shape memory alloy wire313ofFIG.6) which is electrically connected to the power supply circuit and is capable of being contracted or relaxed in a state where at least a part thereof is supported to the support body, and a spring (e.g., the spring315ofFIG.6) configured to restore the movable magnetic body module.

According to an embodiment, a feeder (e.g., the feeder267ofFIG.6), which is disposed in the longitudinal direction of the movable magnetic body module to be connected to the shape memory alloy wire, may be included therein.

According to an embodiment, the shape memory alloy wire may include multiple wires arranged to be parallel to each other along the longitudinal direction of the movable magnetic body module, and the distance between the multiple wires may be formed to be greater than the diameter of each of the wires.

According to an embodiment, a processor (e.g., the processor263ofFIG.9) may be further included therein, wherein the processor may be configured to adjust the magnitude of power and/or a supply time period of power supplied to the shape memory alloy member, based on at least one element of a temperature of or around the electronic device, the tilting state of the electronic device with respect to the direction of gravity, and the folding state of the electronic device.

Although specific embodiments are described in the above detailed description, it will be obvious to a person skilled in the art that various changes are possible within the range without departing from the scope of the invention.