Patent Publication Number: US-2023148721-A1

Title: Electronic device cover

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a bypass continuation of International Application No. PCT/KR2021/008420, filed on Jul. 2, 2021, which claims priority from Korean Patent Application No. 10-2020-0091306 filed on Jul. 22, 2020, in the Korean Intellectual Property Office, the contents of which are incorporated by reference in their entireties. 
    
    
     BACKGROUND 
     1. Technical Field 
     Various embodiments of the present disclosure relate to an electronic device cover. 
     2. Description of the Related Art 
     A cover may be attached to an electronic device such as a tablet PC. The cover may protect the electronic device. A collapsible cover may be used to mount an electronic device at various angles. 
     For example, the cover may include a collapsible structure that allows a user to freely adjust an angle at which the electronic device is mounted. The collapsible structure may be included in the cover so that the cover may be maintained or fixed at any angle. However, the collapsible structure makes it difficult for the cover to be slim. 
     SUMMARY 
     Various embodiments of the present disclosure may provide an electronic device cover capable of contributing to slimness by simplifying a structure. 
     Technical problems to be solved by the present disclosure are not limited to the above-mentioned technical problems, and other technical problems, which are not mentioned above, may be clearly understood from the following descriptions by those skilled in the art to which the present disclosure pertains. 
     According to an embodiment of the present disclosure, disclosed is a cover for an electronic device, the cover including: a first plate configured to be attached to or detached from one surface of the electronic device; a second plate disposed to overlap the first plate; and a third plate connected to the second plate by a hinge and configured such that an angle defined by the third plate and the first plate is changed by a rotation of the third plate relative to the second plate, wherein at least one of the second plate or the third plate includes a composite material sheet, and wherein at least a part of the hinge is disposed in the composite material sheet. 
     In an embodiment, the second and the third plates include composite material sheets, and the hinge includes: one or more first hinge plates at least partially disposed in the composite material sheet of the second plate; one or more second hinge plates at least partially disposed in another composite material sheet of the third plate; and a rotary part configured to connect the one or more first hinge plates and the one or more second hinge plates. 
     In an embodiment, the cover further includes: a plurality of magnetic elements at least partially disposed in a composite material sheet of the first plate, wherein the plurality of magnetic elements applies an attractive force between the first plate and the electronic device. 
     In an embodiment, the cover further includes: a magnetic element at least partially disposed in a composite material sheet of the first plate; and another magnetic element at least partially disposed in another composite material sheet of the third plate, wherein the magnetic element and the other magnetic element overlaps each other and applies an attractive force between the first plate and the third plate when the first plate and the third plate define an angle of 0 degree. 
     In an embodiment, the cover further includes: a fourth plate disposed at a side opposite to the third plate and configured to be rotatable relative to the second plate. 
     The electronic device cover according to an embodiment of the present disclosure may contribute to slimness and simplify a manufacturing process thereof. 
     Other effects, which may be obtained or expected by various embodiments of the present disclosure, will be directly or implicitly disclosed in the detailed description on the embodiments of the present disclosure. For example, various effects expected according to various embodiments of the present disclosure will be disclosed in the detailed description to be described below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS.  1 ,  2 ,  3 , and  4    are views illustrating a state in which a cover according to an embodiment is attached to an electronic device. 
         FIG.  5    is a deployed perspective view of the cover according to an embodiment illustrated in  FIG.  1   . 
         FIGS.  6 A and  6 B  are top plan views of the cover in an unfolded state according to an embodiment. 
         FIG.  7 A  is a view illustrating a cross-sectional structure taken along line D-D′ in  FIG.  5    according to an embodiment. 
         FIG.  7 B  is a view illustrating a cross-sectional structure taken along line E-E′ in  FIG.  5    according to an embodiment. 
         FIG.  7 C  is a view illustrating a cross-sectional structure taken along line F-F′ in  FIG.  5    according to an embodiment. 
         FIG.  8    is a view illustrating a cross-sectional structure taken along line C-C′ in FIG.  1  according to an embodiment. 
         FIG.  9    is a view illustrating a cross-sectional structure taken along line A-A′ in  FIG.  6 A  according to an embodiment. 
         FIG.  10    is a view illustrating a cross-sectional structure taken along line B-B′ in  FIG.  6 B  according to an embodiment. 
         FIG.  11    is a view illustrating a cross-sectional structure in a state in which a third cover part according to an embodiment is rotated relative to a second cover part so as to be separated from a first plate. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. 
     Various embodiments of the present document and the terms used in the embodiments are not intended to limit the technical features disclosed in the present document to the particular embodiments and should be understood as including various alterations, equivalents, or alternatives of the corresponding embodiments. In connection with the description of the drawings, the same or similar reference numerals may be used for the similar components. A singular form of a noun corresponding to an item may include one or more of the items, unless the relevant context clearly indicates otherwise. As used in the present document, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). 
       FIG.  1 ,  2 ,  3   , or  4  illustrates a state in which a cover  100  according to an embodiment is attached to an electronic device  200 . 
     According to an embodiment, the cover  100  may be attached to the electronic device  200  (e.g., a tablet PC (a tablet personal computer)). For example, the cover  100  may be attached to a rear surface (e.g., a rear surface  201  in  FIG.  4   ) of the electronic device  200 . The rear surface of the electronic device  200  may be a surface directed in a direction opposite to a direction in which a display of the electronic device  200  is directed. The cover  100  may be a collapsible cover that allows a user to freely adjust an angle at which the electronic device  200  is mounted. 
     According to an embodiment, the cover  100  may include a folding structure and be disposed in an unfolded state (a flat state) or a folded state by using the folding structure.  FIG.  1    illustrates the unfolded state of the cover  100  attached to the electronic device  200 . The cover  100  may include a cover part assembly  140  (see  FIG.  1  or  2   ) including a first cover part  110 , a second cover part  120 , and/or a third cover part  130 . The second cover part  120  may be rotatably connected to one side of the first cover part  110 , and the third cover part  130  may be rotatably connected to the other side of the first cover part  110 . The cover  100  may include a folding part between the first cover part  110  and the second cover part  120 , and another folding part between the first cover part  110  and the third cover part  130 . In a state in which the cover  100  is attached to the electronic device  200 , the second cover part  120  may rotate about a first folding axis (or a first rotation axis) C 1  of the folding part relative to the first cover part  110 , and the third cover part  130  may rotate about a second folding axis (or a second rotation axis) C 2  of another folding part relative to the first cover part  110 . The first folding axis C  1  and the second folding axis C 2  may be substantially parallel to each other. For example, the first cover part  110 , the second cover part  120 , and the third cover part  130  may be rectangular plates having the same width in a direction of the folding axis (e.g., the first folding axis C 1  or the second folding axis C 2 ). The cover  100  may be unfolded in the form (e.g., a rectangular shape) in which the cover  100  mostly overlaps the rear surface of the electronic device  200  (see  FIG.  1   ). In the unfolded state, for example, the first cover part  110  and the second cover part  120  may substantially define an angle of 180 degrees, or the second cover part  120  and the rear surface of the electronic device  200  may substantially define an angle of 0 degree. In the unfolded state, for example, the first cover part  110  and the third cover part  130  may substantially define an angle of 180 degrees, or the third cover part  130  and the rear surface of the electronic device  200  may substantially define 0 degree. The angle between the first cover part  110  and the second cover part  120  or the angle between the first cover part  110  and the third cover part  130  has been described on the basis of a state in which the rear surface of the electronic device  200  is substantially flat. However, the cover may be implemented on the basis of the shape of the rear surface of the electronic device  200 , such that the angle between the cover part or the angle between the cover part and the rear surface may be variously implemented. 
       FIG.  2 ,  3   , or  4  illustrates the folded state of the cover  100  attached to the electronic device  200  according to an embodiment. For example,  FIG.  2  or  3    illustrates a first folded state in which the second cover part  120  is rotated about the first folding axis C 1  relative to the first cover part  110 . In the first folded state of the cover  100 , the second cover part  120  may be used as a support, such that the electronic device  200  may stand on an object such as a table. An angle at which the electronic device  200  stands (or a direction in which a screen of the electronic device  200  is directed) may vary depending on the angle between the second cover part  120  and the first cover part  110  or the angle between the second cover part  120  and the rear surface of the electronic device  200 . 
     For example, a pen input device  400  (e.g., a stylus pen) (see  FIG.  4   ) may be positioned on the rear surface  201  of the electronic device  200 . The pen input device  400  may be positioned on the rear surface  201  of the electronic device  200  by an attractive force between a magnetic element (e.g., a magnet) included in the pen input device  400  and a magnetic element (e.g., a magnet) included in the electronic device  200 . According to an embodiment, the third cover part  130  of the cover  100  may include a pen cover part  105  including a recess (e.g., a concavely recessed space)  104  that accommodates at least a part of the pen input device  400 . In case that the third cover part  130  is attached to the rear surface  201  of the electronic device  200  or the first cover part  110  and the third cover part  130  substantially define an angle of 180 degrees (see  FIG.  1 ,  2   , or  3 ), at least a part of the pen input device  400  attached to the rear surface  201  of the electronic device  200  may be accommodated in the recess  104  and covered by the pen cover part  105 . For example, the pen cover part  105  may have a protruding shape including the recess  104 . As illustrated in  FIG.  4   , in a second folded state in which the third cover part  130  is rotated about the second folding axis C 2  relative to the first cover part  110 , the pen input device  400  attached to the rear surface  201  of the electronic device  200  may be exposed to the outside. 
     For example, the electronic device  200  may include a first camera module  202 , a second camera module  203 , and/or a flash  204  disposed on the rear surface  201 . According to an embodiment, the third cover part  130  of the cover  100  may include a first opening  101 . In case that the third cover part  130  is attached to the rear surface  201  of the electronic device  200  or the first cover part  110  and the third cover part  130  substantially define an angle of 180 degrees (see  FIG.  1 ,  2   , or  3 ), the first camera module  202 , the second camera module  203 , and the flash  204  may overlap the first opening  101  and be exposed to the outside. 
     According to any embodiment, the electronic device  200  may not support the function of attaching or detaching the pen input device  400 . In this case, the third cover part  130  of the cover  100  may be eliminated or substituted for the third cover part  130 , such that the first cover part  110  may be further expanded. 
     According to an embodiment, the cover  100  may include a first plate  510  (see  FIG.  2  or  3   ). The cover  100  may be attached to the electronic device  200  by using the first plate  510 . For example, a plurality of magnetic elements (e.g., magnets) may be disposed in the first plate  510 . The first plate  510  may be attached to the rear surface  201  of the electronic device  200  by an attractive force between the plurality of magnetic elements disposed in the first plate  510  and the magnetic elements included in the electronic device  200 . The rear surface  201  of the electronic device  200  may include a third area  201   a  that overlaps the first cover part  110 . The rear surface  201  of the electronic device  200  may include a fourth area  201   b  that may overlap the second cover part  120 . The first plate  510  may include a first area (not illustrated) positioned between the first cover part  110  and the third area  201   a  of the rear surface  201 . The first plate  510  may include a second area  510   b  extending from the first area and configured to face the fourth area  201   b  of the rear surface  201 . The first cover part  110  may be attached to the rear surface  201  of the electronic device  200  by an attractive force between at least one magnetic element (e.g., a magnet) positioned in the first area of the first plate  510  and at least one magnetic element (e.g., a magnet) included in the electronic device  200 . The second area  510   b  of the first plate  510  may be attached to the rear surface  201  of the electronic device  200  by an attractive force between one or more magnetic elements positioned in the second area  510   b  of the first plate  510  and one or more magnetic elements included in the electronic device  200 . The second cover part  120  and attached to the second area  510   b  by an attractive force between at least one magnetic element included in the second area  510   b  and the at least one magnetic element included in the second cover part  120  (e.g., see  FIG.  1   ). The second cover part  120  may be separated from the second area  510   b  by being rotated by an external force and define a corresponding angle with the second area  510   b  (see  FIG.  2  or  3   ). 
     According to an embodiment, the third cover part  130  may be attached to the rear surface  201  of the electronic device  200  by an attractive force between at least one magnetic element included in the third cover part  130  and at least one magnetic element included in the electronic device  200  (see  FIG.  1 ,  2   , or  3 ). The third cover part  130  may be separated from the rear surface  201  of the electronic device  200  by being rotated by an external force and define a corresponding angle with the rear surface  201  (see  FIG.  4   ). 
     According to an embodiment, the cover  100  may include a hinge (or a hinge structure) that defines the first folding axis C 1 . For example, the hinge may include at least one first hinge arm coupled to the first cover part  110 , at least one second hinge arm coupled to the second cover part  120 , and a rotary part configured to connect at least one first hinge arm and at least one second hinge arm. The first folding axis C 1  may be defined by the rotary part of the hinge. The hinge enables the user to freely adjust an angle between the first cover part  110  and the second cover part  120 . The hinge may have a fixing force that may maintain the first cover part  110  and the second cover part  120  at any angle. For example, the hinge may include a free-stop hinge. 
     According to an embodiment, at least a part of the hinge may be positioned in the first cover part  110  or the second cover part  120 . For example, at least one first hinge arm may extend into the first cover part  110 . According to an embodiment, the first hinge arm may be provided on a second plate by in-molding, and the second plate may be included in the first cover part  110  and provided in the form of a sheet made of a composite material. For example, at least one second hinge arm may extend into the second cover part  120 . According to an embodiment, the second hinge arm may be provided on a third plate by in-molding, and the third plate may be included in the second cover part  120  and provided in the form of a sheet made of a composite material. 
       FIG.  5    is a deployed perspective view of the cover  100  according to an embodiment illustrated in  FIG.  1   .  FIG.  6 A or  6 B  is a top plan view of the cover  100  in the unfolded state according to an embodiment.  FIG.  7 A  is a view illustrating a cross-sectional structure  701  taken along line D-D′ in  FIG.  5    according to an embodiment.  FIG.  7 B  is a view illustrating a cross-sectional structure  702  taken along line E-E′ in  FIG.  5    according to an embodiment.  FIG.  7 C  is a view illustrating a cross-sectional structure  703  taken along line F-F′ in  FIG.  5    according to an embodiment. 
     With reference to  FIG.  5   , in an embodiment, the cover  100  may include the first plate  510 , a second plate  520 , a third plate  530 , a fourth plate  540 , a plurality of first magnetic elements  610 , one or more second magnetic elements  620 , one or more third magnetic elements  630 , one or more fourth magnetic elements  640 , a hinge  700 , a first sheet  810 , or a second sheet  820 . A repeated description of some of the reference numerals will be omitted. 
     According to an embodiment, with reference to  FIGS.  5  and  6 A , the first plate  510  may include the first area  510   a  and the second area  510   b . For example, the first area  510   a  and the second area  510   b  may be rectangular areas extending in two opposite directions based on the first folding axis C 1  and having the same width extending in the direction of the first folding axis C 1  when viewed from above the first plate  510 . 
     According to an embodiment, the plurality of first magnetic elements  610  (e.g., the plurality of first magnets) may be positioned in the first plate  510 . In  FIG.  1   , the electronic device  200  may include a plurality of magnetic elements corresponding to the plurality of first magnetic elements  610 . The first plate  510  may be attached to the electronic device  200  by an attractive force between the plurality of first magnetic elements  610  and the plurality of magnetic elements included in the electronic device  200 . The first plate  510  may include a first surface  511 , and a second surface (not illustrated) directed in a direction opposite to the first surface  511 . For example, when the cover  100  is attached to the electronic device  200  (see  FIG.  1   ), the first surface  511  may face the rear surface  201  of the electronic device  200  (see  FIG.  4   ). The plurality of first magnetic elements  610  may be provided between the first surface  511  and the second surface and positioned in the first plate  510 . According to various embodiments, the plurality of first magnetic elements  610  may be at least partially disposed in the first plate  510  so as to be closer to the first surface  511  than the second surface. According to various embodiments, the plurality of first magnetic elements  610  may be disposed in a recess (not illustrated) formed in the first surface  511  and may not protrude with respect to the first surface  511 . According to any embodiment, the plurality of first magnetic elements  610  may be disposed in a recess (not illustrated) formed in the second surface. 
     According to an embodiment, the plurality of first magnetic elements  610  may be positioned in the first plate  510  and disposed at spacing distances. For example, some of the plurality of first magnetic elements  610  may be positioned in the first area  510   a , and some of the plurality of first magnetic elements  610  may be positioned in the second area  510   b . The number of the plurality of first magnetic elements or the positions of the plurality of first magnetic elements may be variously provided without being limited to an embodiment illustrated in  FIG.  5  or  6 A . 
     According to an embodiment, the first plate  510  may include a first composite material sheet. For example, the first plate  510  may be formed by compressing (e.g., thermally compressing) a plurality of prepregs (pre-impregnated materials). For example, the prepreg may be a composite material intermediate material made by infiltrating a coupling agent (e.g., liquid synthetic resin) into reinforcing fibers (or fiber reinforcement) (or impregnating reinforcing fibers (or fiber reinforcement) with a coupling agent (e.g., liquid synthetic resin)). For example, the reinforcing fiber of the prepreg may include at least one of carbon fiber, fiberglass, or aramid fiber. For example, the coupling agent of the prepreg may include at least one of epoxy resin, polyester resin, or thermoplastic resin. With reference to the cross-sectional structure  701  (see  FIG.  7 A ) taken along line D-D′ in  FIG.  5   , the first plate  510  may include a first layer  5101 , a second layer  5102 , and a third layer  5103 , for example. The second layer  5102  (e.g., an inner core) may be positioned between the first layer  5101  and the third layer  5103 . For example, the first layer  5101 , the second layer  5102 , and/or the third layer  5103  may be formed by compressing (e.g., thermally compressing) a plurality of prepregs. The second layer  5102  may include a first space portion  5104  (e.g., an opening) in which one of the plurality of first magnetic elements  610  is disposed. An operation of disposing the one of the plurality of first magnetic elements  610  in the first space portion  5104  of the second layer  5102  and an operation of coupling (e.g., thermally compressing) the first layer  5101 , the second layer  5102 , and the third layer  5103  by using an adhesive material (e.g., a thermally reactive adhesive agent) may be performed. With this method, the plurality of first magnetic elements  610  may be positioned in the first plate  510  (e.g., in-molding). The plurality of first magnetic elements  610  may be coupled to the first layer  5101 , the second layer  5102 , and the third layer  5103  by means of the adhesive material. The number of layers included in the first plate  510  may vary without being limited to an embodiment illustrated in  FIG.  7 A . 
     According to another embodiment, the first plate  510  may be implemented to be coupled to the plurality of first magnetic elements  610  by using insert molding. According to various embodiments, the first plate  510  may include a plurality of layers (or sheets). The plurality of first magnetic elements may be positioned between the plurality of layers. For example, the first plate  510  may include various polymer layers. 
     For example, the plurality of first magnetic elements  610  may have one or more magnetic structure arrangements including first polarities of N-polarities and second polarities of S-polarities (two arrangements in the example illustrated in  FIG.  6 A ). The magnetic structure arrangements of some of the plurality of first magnetic elements  610  may be disposed in an x-axis direction, and the magnetic structure arrangements of some of the plurality of first magnetic elements  610  may be disposed in a y-axis direction. The arrangement direction of the magnetic structure and/or the positions of the plurality of first magnetic elements  610  may guide the position or direction in which the first plate  510  is attached to the electronic device  200  to the user. 
     According to an embodiment, the second plate  520  and the third plate  530  may be connected by the hinge  700 . The hinge  700  may include one or more first hinge arms  710 , one or more second hinge arms  720 , and a rotary part  730 . The one or more first hinge arms  710  may be coupled to the second plate  520 . The one or more second hinge arms  720  may be coupled to the third plate  530 . The rotary part  730  may connect the one or more first hinge arms  710  and the one or more second hinge arms  720 . The second plate  520  coupled to the one or more first hinge arms  710  and the third plate  530  coupled to the one or more second hinge arms  720  may rotate relative to each other by means of the rotary part  730 . The rotary part  730  may have a fixing force that may maintain a positional relationship between the second plate  520  and the third plate  530  at any angle between the second plate  520  and the third plate  530 . 
     According to an embodiment, at least a part of the hinge  700  may be positioned in the second plate  520  or the third plate  530 . For example, the one or more first hinge arms  710  may extend into the second plate  520 . For example, the one or more second hinge arms  720  may extend into the third plate  530 . The second plate  520  and/or the third plate  530  may include various polymers such as epoxy. 
     According to an embodiment, the second plate  520  may include a second composite material sheet. For example, the second plate  520  may be formed by compressing (e.g., thermally compressing) a plurality of prepregs. With reference to the cross-sectional structure  702  (see  FIG.  7 B ) taken along line E-E′ in  FIG.  5   , the second plate  520  may include a first layer  5201 , a second layer  5202 , and a third layer  5203 , for example. The second layer  5202  (e.g., an inner core) may be positioned between the first layer  5201  and the third layer  5203 . For example, the first layer  5201 , the second layer  5202 , and/or the third layer  5203  may be formed by compressing (e.g., thermally compressing) a plurality of prepregs. The second layer  5202  may include a fifth space portion  5204  (e.g., an opening) in which the first hinge arm  710  is disposed. An operation of disposing the first hinge arm  710  in the fifth space portion  5204  of the second layer  5202  and an operation of coupling (e.g., thermally compressing) the first layer  5201 , the second layer  5202 , and the third layer  5203  by using an adhesive material (e.g., a thermally reactive adhesive agent) may be performed. With this method, the one or more first hinge arms  710  may be disposed in the second plate  520  in a state in which the one or more first hinge arms  710  extend into the second plate  520  (e.g., in-molding). The one or more first hinge arms  710  may be coupled to the first layer  5201 , the second layer  5202 , and the third layer  5203  by means of the adhesive material. The number of layers included in the second plate  520  may vary without being limited to an embodiment illustrated in  FIG.  7 B . 
     According to an embodiment, although not illustrated, the third plate  530  may be implemented in substantially the same way as the second plate  520 , and the one or more second hinge arms  720  may be disposed in the third plate  530  in a state in which the one or more second hinge arms  720  extend into the third plate  530 . For example, the third plate  530  may include a third composite material sheet formed by compressing a plurality of prepreg, and the one or more second hinge arms  720  may be positioned and extend into the third composite material sheet (e.g., in-molding). 
     According to another embodiment, the second plate  520  coupled to the one or more first hinge arms  710  may be implemented by insert molding. According to another embodiment, the third plate  530  coupled to the one or more second hinge arms  720  may be implemented by insert molding. 
     According to an embodiment, the one or more first hinge arms  710  may be provided in the form of a plate to minimize a thickness of the second plate  520  while increasing a junction area with the second plate  520 . The first hinge arm having a plate shape may be referred to as a first hinge plate. The one or more second hinge arms  720  may be provided in the form of a plate to minimize a thickness of the third plate  530  while increasing a junction area with the third plate  530 . The second hinge arm having a plate shape may be referred to as a second hinge plate. At least a part of the hinge  700  may contribute to slimness of the cover  100  by simplifying the structure positioned in the second plate  520  or the third plate  530 . 
     According to an embodiment, the rotary part  730  may define the first folding axis C 1  (e.g., a shaft included in the rotary part  730 ) and be disposed along the first folding axis C 1  between one side edge of the second plate  520  and one side edge of the third plate  530 . In any embodiment, various other terms such as a ‘hinge assembly’ including the second plate  520 , the third plate  530 , and the hinge  700  may be used. 
     According to an embodiment, the second plate  520  and the third plate  530  may each have a rectangular shape extending in the opposite directions based on the first folding axis C 1  and having the same width in the direction of the first folding axis C 1  (e.g., the x-axis direction). The second plate  520  may at least partially overlap the first area  510   a  of the first plate  510  when viewed from above the first plate  510  (e.g., when viewed in the x-axis direction). The first plate  510  and the second plate  520  may be substantially parallel to each other. As illustrated, in case that the second plate  520  and the third plate  530  substantially define an angle of 180 degrees, the third plate  530  may be disposed substantially in parallel with the first plate  510  while at least partially overlapping the first plate  510 . The third plate  530  may be rotated about the first folding axis C 1  relative to the second plate  520  while deviating from the state parallel to the first plate  510 , such that the third plate  530  may define the corresponding angle with respect to the first plate  510 . The second plate  520  may be included in the first cover part  110  (see  FIG.  6 A or  6 B ), and the third plate  530  may be included in the second cover part  120  (see  FIG.  6 A or  6 B ). 
     According to an embodiment, the one or more second magnetic elements  620  (e.g., the one or more second magnets) may be positioned in the first plate  510 . The one or more second magnetic elements  620  may be positioned in the first plate  510  in substantially the same way as the plurality of first magnetic elements  610 . For example, the one or more second magnetic elements  620  may be at least partially positioned in the first plate  510 . According to an embodiment, the second layer  5102  (see  FIG.  7 A ) of the first plate  510  may further include not only the first space portions (e.g., see the first space portion  5104 ) in which the plurality of first magnetic elements  610  is disposed, but also second space portions in which the one or more second magnetic elements  620  are disposed. An operation of disposing the plurality of first magnetic elements  610  in the first space portions of the second layer  5102  and disposing the one or more second magnetic elements  620  in the second space portions of the second layer  5102  and an operation of coupling (e.g., thermally compressing) the first layer  5101 , the second layer  5102 , and the third layer  5103  by using an adhesive material (e.g., a thermally reactive adhesive agent) may be performed. With this method, the plurality of first magnetic elements  610  and the one or more second magnetic elements  620  may be positioned in the first plate  510  (e.g., in-molding). The plurality of first magnetic elements  610  and the one or more second magnetic elements  620  may be coupled to the first layer  5101 , the second layer  5102 , and the third layer  5103  by means of the adhesive material. 
     According to an embodiment, the one or more third magnetic elements  630  (e.g., the one or more third magnets) may be positioned in the third plate  530 . The one or more third magnetic elements  630  may be positioned in the third plate  530  in substantially the same way as the plurality of first magnetic elements  610 . For example, the one or more third magnetic elements  630  may be at least partially positioned in the third plate  530 . With reference to the cross-sectional structure  703  (see  FIG.  7 C ) taken along line F-F′ in  FIG.  5   , the third plate  530  may be a third composite material sheet and include a first layer  5301 , a second layer  5302 , and a third layer  5303 , for example. The second layer  5302  (e.g., an inner core) may further include not only sixth space portions (not illustrated) in which the one or more second hinge arms  720  are disposed, but also third space portions (e.g., see a third space portion  5304 ) in which the one or more third magnetic elements  630  are disposed. An operation of disposing the one or more second hinge arms  720  in the sixth space portions of the second layer  5302  and disposing the one or more third magnetic elements  630  in the third space portions of the second layer  5202  and an operation of coupling (e.g., thermally compressing) the first layer  5301 , the second layer  5302 , and the third layer  5303  by using an adhesive material (e.g., a thermally reactive adhesive agent) may be performed. With this method, the one or more second hinge arms  720  and the one or more third magnetic elements  630  may be positioned in the third plate  530  (e.g., in-molding). The one or more second hinge arms  720  and the one or more third magnetic elements  630  may be coupled to the first layer  5301 , the second layer  5302 , and the third layer  5303  by means of the adhesive material. The number of layers included in the third plate  530  may vary without being limited to an embodiment illustrated in  FIG.  7 C . 
     According to an embodiment, when the first plate  510  and the third plate  530  substantially define an angle of 0 degree (or disposed in parallel with each other) while overlapping each other, the one or more second magnetic elements  620  and the one or more third magnetic elements  630  may be aligned with one another while overlapping one another in a one-to-one manner. The state in which the third plate  530  is parallel to the first plate  510  while overlapping the first plate  510  may be maintained by an attractive force between the one or more second magnetic elements  620  and the one or more third magnetic elements  630  that are aligned with one another while overlapping one another. 
     According to an embodiment, the one or more third magnetic elements  630  may be positioned in the third plate  530  so as to be closer to the other side edge  533  parallel to one side edge than one side edge disposed adjacent to the first folding axis C 1 . This prevents the attractive force between the one or more second magnetic elements  620  and the one or more third magnetic elements  630  from being applied to be close to the first folding axis C 1 . Therefore, it is possible to allow the second cover part  120  (see  FIG.  6 A or  6 B ) including the third plate  530  to be tightly attached to the first plate  510  or it is possible to improve openness when the second cover part  120  is attached to or separated from the first plate  510 . The number of third magnetic elements or the position of the third magnetic element and the number of second magnetic elements or the position of the second magnetic element corresponding to the third magnetic element may vary without being limited to an embodiment illustrated in  FIG.  5  or  6 A . 
     According to an embodiment, the fourth plate  540  may be disposed to be rotatable relative to the second plate  520  and provided at the side different from the side of the third plate  530 . In the illustrated example, the fourth plate  540  may be rotated relative to the second plate  520  and provided at the side opposite to the side of the third plate  530 , and the fourth plate  540  may be included in the third cover part  130  (see  FIG.  6 A or  6 B ). For example, the folding axis between the second plate  520  and the fourth plate  540  may be parallel to the first folding axis C 1  between the second plate  520  and the third plate  530 . An area in which the fourth plate  540  overlaps the rear surface  201  of the electronic device  200  (see  FIG.  4   ) when the second plate  520  and the fourth plate  540  substantially define an angle of 180 degrees may be positioned at the side opposite to the side of the fourth area  201   b  (see  FIG.  1   ) with the third area  201   a  (see  FIG.  1   ) interposed therebetween. 
     According to another embodiment, the fourth plate  540  may be disposed to be rotatable relative to the second plate  520  and provided at another side without being limited to the illustrated embodiment. 
     According to an embodiment, the first plate  510  may be formed so as not to be expanded to the area in which the fourth plate  540  overlaps the rear surface  201  of the electronic device  200  (see  FIG.  4   ) when the second plate  520  and the fourth plate  540  substantially define an angle of 180 degrees. For example, the first plate  510  may be formed so as not to be expanded between the fourth plate  540  and the rear surface  201  of the electronic device  200  (see  FIG.  4   ) when the second plate  520  and the fourth plate  540  substantially defines an angle of 180 degrees. 
     According to an embodiment, the one or more fourth magnetic elements  640  (e.g., the one or more fourth magnets) may be positioned in the fourth plate  540 . The one or more fourth magnetic elements  640  may be positioned in the fourth plate  540  in substantially the same way as the plurality of first magnetic elements  610 . For example, the one or more fourth magnetic elements  640  may be at least partially positioned in the fourth plate  540 . The one or more fourth magnetic elements  640  may be aligned with and overlap the one or more magnetic elements included in the electronic device  200  in a one-to-one manner, and the third cover part  130  may be attached to the electronic device  200  by the attractive force between the one or more fourth magnetic elements  640  and the one or more magnetic elements included in the electronic device  200 . 
     According to various embodiments (not illustrated), the fourth plate  540  may be a fourth composite material sheet formed by compressing a plurality of prepregs and include a first layer, a second layer, and a third layer, for example. The second layer may include fourth space portions (e.g., substantially identical in shape to the first space portion  5104 ) in which the one or more fourth magnetic elements  640  are disposed. An operation of disposing the one or more fourth magnetic elements  640  in the fourth space portions of the second layer and an operation of coupling (e.g., thermally compressing) the first layer, the second layer, and the third layer by using an adhesive material (e.g., a thermally reactive adhesive agent). With this method, the one or more fourth magnetic elements  640  may be positioned in the fourth plate  540  (e.g., in-molding). The one or more fourth magnetic elements  640  may be coupled to the first layer, the second layer, and the third layer by means of the adhesive material. 
     According to an embodiment, the pen cover part  105 , which includes the recess  104 , and a structure  106 , which includes the first opening  101 , may be disposed on the fourth plate  540 . The structure  106  may include a material different from a material of the fourth plate  540 . For example, the structure  106  and the fourth plate  540  may be formed by dual injection molding. According to any embodiment, the structure  106  and the fourth plate  540  may be integrated and include the same material. 
     According to an embodiment, the first sheet  810  may include a first part  1  coupled to the second plate  520 , a second part  2  coupled to the third plate  530 , and/or a third part  3  coupled to the fourth plate  540 . The second sheet  820  may include a fourth part  4  coupled to the second plate  520 , a fifth part  5  coupled to the third plate  530 , and/or a sixth part  6  coupled to the fourth plate  540 . The second plate  520  may be positioned between the first part  1  and the fourth part  4  and may not be exposed to the outside. The third plate  530  may be positioned between the second part  2  and the fifth part  5  and may not be exposed to the outside. The fourth plate  540  may be positioned between the third part  3  and the sixth part  6  and may not be exposed to the outside. An adhesive polymer material may be disposed between the second plate  520  and the first part  1 , between the second plate  520  and the fourth part  4 , between the third plate  530  and the second part  2 , between the third plate  530  and the fifth part  5 , between the fourth plate  540  and the third part  3 , and/or between the fourth plate  540  and the sixth part  6 . For example, the adhesive material may include a thermally reactive adhesive agent, a general adhesive agent, and/or a double-sided tape. 
     According to an embodiment, the first sheet  810  and/or the second sheet  820  may include leather. According to another embodiment, the first sheet  810  and/or the second sheet  820  may include a fabric. According to another embodiment, the first sheet  810  and/or the second sheet  820  may include various polymers. 
     According to an embodiment, the first sheet  810  may include a first folding part F 1  between the first part  1  and the second part  2 , and a second folding part F 2  between the first part  1  and the third part  3 . The first folding part F 1  and the second folding part F 2  may extend in parallel with each other in the direction of the first folding axis C 1  (e.g., the x-axis direction). The first folding part F 1  may overlap the first folding axis C 1 . For example, the first part  1  and the second part  2  may have the same width extending in the direction of the first folding axis C 1  and be rectangular areas extending toward two opposite sides based on the first folding part F 1 . For example, the third part  3  may have the same width, which extends in the direction of the first folding axis C 1 , as the first part  1 . The third part  3  may be a rectangular area extending from the second folding part F 2  toward the side opposite to the first part  1 . The first part  1  may be included in the first cover part  110  ( FIG.  6 A or  6 B ). The second part  2  may be included in the second cover part  120  ( FIG.  6 A or  6 B ). The third part  3  may be included in the third cover part  130  ( FIG.  6 A or  6 B ). The first folding part F 1  and the second folding part F 2  have higher bendability than the other parts of the first sheet  810 . For example, the first folding part F 1  and the second folding part F 2  may be variously implemented to have a shape (e.g., a groove extending in the direction of the first folding axis C 1 ) having a relatively smaller thickness than the other parts or have a shape having an opening (e.g., a fourth opening  814  formed in the first folding part F 1 ). 
     According to an embodiment, the second sheet  820  may include a third folding part F 3  between the fourth part  4  and the fifth part  5 , and a fourth folding part F 4  between the fourth part  4  and the sixth part  6 . The third folding part F 3  and the fourth folding part F 4  may extend in parallel with each other in the direction of the first folding axis C 1  (e.g., the x-axis direction). For example, the fourth part  4  and the fifth part  5  may have the same width extending in the direction of the first folding axis C 1  and have rectangular shapes extending toward two opposite sides based on the third folding part F 3 . For example, the sixth part  6  may have the same width, which extends in the direction of the first folding axis C 1 , as the fourth part  4 . The sixth part  6  may have a rectangular shape extending from the fourth folding part F 4  toward the side opposite to the fourth part  4 . The fourth part  4  may be included in the first cover part  110  (see  FIG.  6 A or  6 B ). The fifth part  5  may be included in the second cover part  120  (see  FIG.  6 A or  6 B ). The sixth part  6  may be included in the third cover part  130  (see  FIG.  6 A or  6 B ). The third folding part F 3  and the fourth folding part F 4  have higher bendability than the other parts of the second sheet  820 . For example, the third folding part F 3  and the fourth folding part F 4  may be variously implemented to have a shape (e.g., a groove extending in the direction of the first folding axis C 1 ) having a relatively smaller thickness than the other parts. The third folding part F 3  may overlap the first folding axis C 1 . The rotary part  730  of the hinge  700  may be positioned between the first folding part F 1  of the first sheet  810  and the third folding part F 3  of the second sheet  820 . The first folding part F 1  of the first sheet  810  and the third folding part F 3  of the second sheet  820  may be positioned to cover edges of two opposite ends of the rotary part  730  of the hinge  700  (see the parts indicated by reference numerals ‘ 821 ’ and ‘ 822 ’ in  FIG.  6 B ). The fourth folding part F 4  may overlap the second folding part F 2  of the first sheet  810 . The second folding part F 2  of the first sheet  810  and the fourth folding part F 4  of the second sheet  820  may define the second folding axis C 2  (see  FIG.  6 A or  6 B ) of the cover  100 . Even though the third cover part  130  (see  FIG.  6 A or  6 B ) including the fourth plate  540  is not directly and hingedly connected to the second plate  520 , the third cover part  130  may be rotated relative to the first cover part  110  (see  FIG.  6 A or  6 B ) including the second plate  520  about the second folding axis C 2  defined by the second folding part F 2  of the first sheet  810  and the fourth folding part F 4  of the second sheet  820 . 
     According to an embodiment, the first sheet  810  may include a second opening  102  formed in the third part  3 . The second opening  102  may overlap the recess  104  and the first opening  101  of the fourth plate  540 . 
     According to an embodiment, the second sheet  820  may include a third opening  103  formed in the sixth part  6 . With reference to  FIG.  6 B , at least a part of the structure  106  may be exposed through the third opening  103 . For example, the first opening  101  included in the structure  106  may be exposed through the third opening  103 . For example, the pen cover part  105  may be disposed in a shape passing through the third opening  103  of the second sheet  820  and protruding in a z-axis direction. 
     According to an embodiment, an edge of the cover part assembly  140  disposed along the dotted line indicated by reference numeral ‘E’ (see  FIG.  6 A or  6 B ) may be formed by coupling the first sheet  810  and the second sheet  820 . 
     According to an embodiment, the first plate  510  may be coupled and attached to the first cover part  110  (see  FIG.  6 A or  6 B ). The first part  1  of the first sheet  810  included in the first cover part  110  may be positioned between the first area  510   a  of the first plate  510  and the second plate  520 . An adhesive material (e.g., a thermally reactive adhesive agent) may be disposed between the first part  1  of the first sheet  810  and the first area  510   a  of the first plate  510 . 
     According to an embodiment, the second cover part  120  (e.g., see  FIG.  6 A or  6 B ) may be rotated about the first folding axis C 1  relative to the first cover part  110 . In accordance with a rotation angle of the second cover part  120 , the second cover part  120  may define a corresponding angle with respect to the second area  510   b  by adjoining the second area  510   b  of the first plate  510  or being separated from the second area  510   b  of the first plate  510 . 
       FIG.  8    is a view illustrating a cross-sectional structure  800  taken along line C-C′ in  FIG.  1    according to an embodiment. 
     A repeated description of some of the reference numerals in  FIG.  8    will be omitted. 
     With reference to  FIG.  8   , in an embodiment, the electronic device  200  may include a housing that at least partially defines an external appearance. The housing may include a front surface plate  801  configured to at least partially define a front surface, a rear surface plate  802  configured to at least partially define the rear surface  201 , and a lateral member  803  configured to at least partially surround a space between the front surface plate  801  and the rear surface plate  802 . The electronic device  200  may include a support member (e.g., a bracket)  804  positioned between the front surface plate  801  and the rear surface plate  802 . The support member  804  may be connected to the lateral member  803  or integrated with the lateral member  803 . A display  805  may be provided between the front surface plate  801  and the support member  804  and disposed on the support member  804 , light outputted from the display  805  may propagate to the outside while passing through the front surface plate  801 . A printed circuit board  806  may be provided between the rear surface plate  802  and the support member  804  and disposed on the support member  804 . According to an embodiment, the magnetic element  810  may be provided in the electronic device  200  and disposed on the rear surface plate  802 . A position of the magnetic element  810  may be variously configured without being limited to an embodiment illustrated in  FIG.  8   . For example, the magnetic element  810  may be positioned in the rear surface plate  802 . 
     According to an embodiment, the cover  100  may be attached to the rear surface  201  of the electronic device  200 . The magnetic element  810  included in the electronic device  200  and the one of the plurality of first magnetic elements  610  positioned in the first plate  510  of the cover  100  may be aligned to at least partially overlap each other when viewed from above the front surface plate  801 . The cover  100  may be attached to the rear surface  201  of the electronic device  200  by an attractive force between the magnetic element  810  included in the electronic device  200  and the plurality of first magnetic elements  610  positioned in the first plate  510 . 
     According to an embodiment, the edge of the cover part assembly  140  (see  FIG.  6 A or  6 B ) may be formed by joining the first sheet  810  and the second sheet  820 . For example, in  FIG.  8   , an edge  840  of the second cover part  120  may be formed by coupling the first sheet  810  and the second sheet  820 , and a coupling structure may cover a side surface of the third plate  530 . 
     According to an embodiment, as illustrated in  FIG.  8   , in the state in which the second cover part  120  is attached to the first plate  510  by the attractive force between the magnetic elements, a gap  850  may be formed between the second cover part  120 , the rear surface  201  of the electronic device  200 , and the first plate  510 . In the state in which the second cover part  120  is attached to the first plate  510  by the attractive force between the magnetic elements, the first plate  510  may not overlap the edge  840  of the second cover part  120  when viewed from above the front surface plate  801 . The size of the first plate  510  may be reduced so that the first plate  510  does not overlap the second cover part  120  any further without being limited to the example illustrated in  FIG.  8   . According to an embodiment, the gap  850  allows the user to easily manipulate the second cover part  120  when the user rotates the second cover part  120 . The gap may also be formed for the first cover part  110  and/or the third cover part  130  illustrated in  FIG.  6 A or  6 B . 
     According to various embodiments, the first plate  510  may be implemented to be substituted for the rear surface plate  802  of the electronic device  200 . In this case, the plurality of first magnetic elements  610  illustrated in  FIG.  5    may be eliminated from the first plate  510 . 
       FIG.  9    is a view illustrating a cross-sectional structure  900  taken along line A-A′ in  FIG.  6 A  according to an embodiment. A repeated description of some of the reference numerals will be omitted. 
     With reference to  FIG.  9   , in an embodiment, the second cover part  120  may be attached to the first plate  510  by an attractive force between the one or more second magnetic elements  620  positioned in the first plate  510  and the one or more third magnetic elements  630  positioned in the third plate  530  included in the second cover part  120 . The one or more second magnetic elements  620  may be positioned at various other positions without being limited to the example illustrated in  FIG.  9   . For example, the one of the one or more second magnetic elements  620  may be disposed in a recess formed in the first surface  511  or a second surface  512  of the first plate  510 . The one or more third magnetic elements  630  may be positioned at various other positions without being limited to the example illustrated in  FIG.  9   . For example, one of the one or more third magnetic elements  630  may be disposed in a recess formed in one surface  531  or the other surface  532  of the third plate  530 . 
       FIG.  10    is a view illustrating a cross-sectional structure  1000  taken along line B-B′ in  FIG.  6 B  according to an embodiment. A repeated description of some of the reference numerals will be omitted. 
     With reference to  FIG.  10   , in an embodiment, the first hinge arm  710  of the hinge  700  may be at least partially positioned in the second plate  520 . The second hinge arm  720  of the hinge  700  may be at least partially positioned in the third plate  530 . 
     According to an embodiment, the first sheet  810  may include the fourth opening  814  corresponding to the rotary part  730  of the hinge  700 . A part  731  of the rotary part  730  included in the hinge  700  may protrude toward the first plate  510  relative to the second plate  520  and/or the third plate  530 . The part  731  of the rotary part  730  may be disposed in the fourth opening  814  of the first sheet  810 . Although not illustrated, the fourth opening  814  may be substituted for a recess formed in one surface of the first sheet  810  that faces the rotary part  730 . The part  731  of the rotary part  730  may be inserted into the recess. The fourth opening  814  may prevent damage to the cross-sectional structure  1000  illustrated in  FIG.  10    and/or contribute to slimness of the cross-sectional structure  1000 . 
     For example, in case that the first sheet  810  may not include the fourth opening  814  or the recess corresponding to the part  731  of the rotary part  730 , the first sheet  810  may be deformed as indicated by the imaginary line designated by reference numeral ‘ 1001 ’ by being pressed by the part  731  of the rotary part  730 . For this reason, the coupling between the second plate  520  and the first sheet  810 , the coupling between the third plate  530  and the first sheet  810 , and/or the coupling between the first sheet  810  and the first plate  510  may be unstable or damaged. The first sheet  810  may not include the fourth opening  814  or the recess, and a first thickness T 1  of a portion positioned between the first sheet  810  and the first hinge arm  710  of the second plate  520  and/or a second thickness T 2  of a portion positioned between the first sheet  810  and the second hinge arm  720  of the third plate  530  may be increased, which makes it possible to prevent the part  731  of the rotary part  730  from affecting the first sheet  810 . However, the thickness of the cover  100  may be increased. 
     According to various embodiments, the thickness of the first sheet  810  may be about 0.42 mm, the thickness of the second sheet  820  may be about 0.42 mm, and the thickness of the second plate  520  and/or the third plate  530  (e.g., a height between the first sheet  810  and the second sheet  820 ) may be about 1.1 mm. According to various embodiments, the thickness of the first cover part  110  (see  FIG.  1   ) or the second cover part  120  (see  FIG.  1   ) may be about 1.8 mm to about 2.0 mm. 
     According to various embodiments, the first sheet  810  may not include the fourth opening  814  or the recess, and the second hinge arm  720  may be positioned to be closest to the second sheet  820  so that the first hinge arm  710  is positioned to be closest to the second sheet  820 . For example, although not illustrated, a first recess may be provided in one surface of the second plate  520  that faces the first sheet  810 , and the first hinge arm  710  may be disposed in the first recess. For example, a second recess may be provided in one surface of the third plate  530  that faces the second sheet  820 , and the second hinge arm  720  may be disposed in the second recess. In this case, the first hinge arm  710  may be implemented so as not to protrude toward the second sheet  820  relative to the second plate  520 , and the second hinge arm  720  may be implemented so as not to protrude toward the second sheet  820  relative to the third plate  530 . 
     According to any embodiment (not illustrated), in case that the rotary part  730  of the hinge  700  has a smaller size than that in an embodiment illustrated in  FIG.  10   , the first sheet  810  may not include the fourth opening  814  or the recess or may have only a shape for the first folding part F 1  (see  FIG.  5   ). 
     According to any embodiment, the first sheet  810  may have a part corresponding to the second cover part  120  and a part corresponding to the third cover part  130  that are separated from each other at a spacing distance while being substituted for the fourth opening  814 . 
       FIG.  11    illustrates a cross-sectional structure  1100  in which the third cover part  130  according to an embodiment is rotated relative to the second cover part  120  so as to be separated from the first plate  510 . A repeated description of some of the reference numerals in  FIG.  11    will be omitted. 
     With reference to  FIG.  11   , in an embodiment, the fourth opening  814  may reduce damage to the first sheet  810  when the third cover part  130  is rotated about the first folding axis C 1  relative to the second cover part  120 . For example, in case that the first sheet  810  does not include the fourth opening  814  corresponding to the rotary part  730 , a part  811  corresponding to the second cover part  120  and a part  812  corresponding to the third cover part  130  are moved away from each other when the third cover part  130  is rotated. For this reason, a part of the first sheet  810 , which corresponds to the rotary part  730 , may be damaged by tensile stress. 
     According to an embodiment of the present disclosure, the electronic device cover (e.g., the cover  100  in  FIG.  5   ) may include the first plate (e.g., the first plate  510  in  FIG.  5   ) that may be attached to or detached from one surface (e.g., the rear surface  201  in  FIG.  4   ) of the electronic device. The electronic device may include the second plate (e.g., the second plate  520  in  FIG.  5   ) coupled to overlap the first plate. The electronic device may include the third plate (e.g., the third plate  530  in  FIG.  5   ) connected to the second plate by means of the hinge (e.g., the hinge  700  in  FIG.  5   ). The angle defined by the first plate and the third plate may be changed by the rotation of the third plate relative to the second plate. The second plate and/or the third plate may each include a composite material sheet. At least a part of the hinge may be positioned in the composite material sheet. 
     According to an embodiment of the present disclosure, the hinge (e.g., the hinge  700  in  FIG.  5   ) may include one or more first hinge plates (e.g., the one or more first hinge arms  710  in  FIG.  5   ) at least partially positioned in the composite material sheet that constitutes the second plate (e.g., the second plate  520  in  FIG.  5   ). The hinge may include one or more second hinge plates (e.g., the one or more second hinge arms  720  in  FIG.  5   ) at least partially positioned in another composite material sheet that constitutes the third plate (e.g., the third plate  530  in  FIG.  5   ). The hinge may include the rotary parts (e.g., the rotary part  730  in  FIG.  5   ) configured to connect the one or more first hinge plates and the one or more second hinge plates. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the plurality of magnetic elements (e.g., the plurality of first magnetic elements  610  in  FIG.  5   ) at least partially positioned in the composite material sheet that constitutes the first plate (e.g., the first plate  510  in  FIG.  5   ). The plurality of magnetic elements applies attractive forces between the first plate and the electronic device. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include: the magnetic elements (e.g., the one or more second magnetic elements  620  in  FIG.  5   ) at least partially positioned in the composite material sheet that constitutes the first plate (e.g., the first plate  510  in  FIG.  5   ); and another magnetic element (e.g., the one or more third magnetic elements  630  in  FIG.  5   ) at least partially positioned in another composite material sheet that constitutes the third plate (e.g., the third plate  530  in  FIG.  5   ). The magnetic element and the other magnetic element overlap each other when the first plate and the third plate define an angle of 0 degree, such that the attractive force may be applied between the first plate and the third plate. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) disposed at the side opposite to the third plate (e.g., the third plate  530  in  FIG.  5   ) and configured to be rotatable relative to the second plate (e.g., the second plate  520  in  FIG.  5   ). 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include at least one sheet (e.g., the first sheet  810  and/or the second sheet  820  in  FIG.  5   ) attached to the second plate (e.g., the second plate  520  in  FIG.  5   ), the third plate (e.g., the third plate  530  in  FIG.  5   ), and the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The at least one sheet may have the folding part (e.g., the first folding part F 1  and/the third folding part F 3  in  FIG.  5   ) between the second plate and the third plate, and another folding part (e.g., the second folding part F 2  and/or the fourth folding part F 4  in FIG.  5 ) between the second plate and the fourth plate. 
     According to an embodiment of the present disclosure, the first plate (e.g., the first plate  510  in  FIG.  5   ) may be formed so as not to be expanded to the area in which the fourth plate overlaps one surface (e.g., the rear surface  201  in  FIG.  5   ) when the second plate (e.g., the second plate  520  in  FIG.  5   ) and the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) define an angle of 180 degrees. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include one or more magnetic elements (e.g., the one or more fourth magnetic elements  640  in  FIG.  5   ) at least partially positioned in the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The one or more magnetic elements may overlap one or more magnetic elements included in the electronic device and apply the attractive force when the second plate (e.g., the second plate  520  in  FIG.  5   ) and the fourth plate define an angle of 180 degrees. 
     According to an embodiment of the present disclosure, the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) may further include the recess (e.g., the recess  104  in  FIG.  4   ) configured to accommodate the pen input device (e.g., the pen input device  400  in  FIG.  4   ) positioned on one surface (e.g., the rear surface  201  in  FIG.  4   ) when the second plate (e.g., the second plate  520  in  FIG.  5   ) and the fourth plate define an angle of 180 degrees. 
     According to an embodiment of the present disclosure, the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) may further include the opening (e.g., the first opening  101  in  FIG.  5   ) that overlaps the camera module (e.g., the first camera module  202 , the second camera module  203 , or the flash  204  in  FIG.  4   ) positioned on one surface (e.g., the rear surface  201  in  FIG.  4   ) when the second plate (e.g., the second plate  520  in  FIG.  5   ) and the fourth plate define an angle of 180 degrees. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the first sheet (e.g., the first sheet  810  in  FIG.  5   ). The first sheet may include: the first part (e.g., the first part  1  in  FIG.  5   ) positioned between the first plate (e.g., the first plate  510  in  FIG.  5   ) and the second plate (e.g., the second plate  520  in  FIG.  5   ); the second part (e.g., the second part  2 ) extending from the first part and coupled to the third plate (e.g., the third plate  530  in  FIG.  5   ); and the third part (e.g., the third part  3  in  FIG.  5   ) extending from the first part and coupled to the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The first sheet may include: the first folding part (e.g., the first folding part F 1  in  FIG.  5   ) between the first part and the second part; and the second folding part (e.g., the second folding part F 2  in  FIG.  5   ) between the first part and the third part. 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the adhesive material disposed between the first plate (e.g., the first plate  510  in  FIG.  5   ) and the first part (e.g., the first part  1  in  FIG.  5   ). 
     According to an embodiment of the present disclosure, the first folding part (e.g., the first folding part F 1  in  FIG.  5   ) may include the opening (e.g., the fourth opening  814  in  FIG.  5 ,  10   , or  11 ) that overlaps the hinge (e.g., the hinge  700  in  FIG.  5   ). 
     According to an embodiment of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the second sheet (e.g., the second sheet  820  in  FIG.  5   ). The second sheet may include: the fourth part (e.g., the fourth part  4  in  FIG.  5   ) coupled to the second plate (e.g., the second plate  520  in  FIG.  5   ); the fifth part (e.g., the fifth part  5  in  FIG.  5   ) extending from the fourth part and coupled to the third plate (e.g., the third plate  530  in  FIG.  5   ); and the sixth part (e.g., the sixth part  6  in  FIG.  5   ) extending from the fourth part and coupled to the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The second plate may be positioned between the first part (e.g., the first part  1  in  FIG.  5   ) and the fourth part. The third plate may be positioned between the second part (e.g., the second part  2  in  FIG.  5   ) and the fifth part. The fourth plate may be positioned between the third part (e.g., the third part  3  in  FIG.  5   ) and the sixth part. The second sheet may include: the third folding part (e.g., the third folding part F 3  in  FIG.  5   ) between the fourth part and the fifth part; and the fourth folding part (e.g., the fourth folding part F 4  in  FIG.  5   ) between the fourth part and the sixth part. 
     According to various embodiments of the present disclosure, the electronic device cover (e.g., the cover  100  in  FIG.  5   ) may include the first plate (e.g., the first plate  510  in  FIG.  5   ) that may be attached to or detached from one surface (e.g., the rear surface  201  in  FIG.  4   ) of the electronic device and made of the first composite material sheet. The cover may include the second plate (e.g., the second plate  520  in  FIG.  5   ) coupled to overlap the first plate and made of the second composite material sheet. The cover may include the third plate (e.g., the third plate  530  in  FIG.  5   ) connected to the second plate by means of the hinge (e.g., the hinge  700  in  FIG.  7   ). The third plate may be made of the third composite material sheet. The angle defined by the first plate and the third plate may be changed by the rotation of the third plate relative to the second plate. The hinge may include one or more first hinge plates (e.g., the one or more first hinge arms  710  in  FIG.  5   ) at least partially positioned in the second composite material sheet. The hinge may include one or more second hinge plates (e.g., the one or more second hinge arms  720  in  FIG.  5   ) at least partially positioned in the third composite material sheet. The hinge may include the rotary parts (e.g., the rotary part  730  in  FIG.  5   ) configured to connect the one or more first hinge plates and the one or more second hinge plates. 
     According to various embodiments of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the plurality of first magnetic elements (e.g., the plurality of first magnetic elements  610  in  FIG.  5   ) positioned in the first composite material sheet. The cover may further include one or more second magnetic elements (e.g., the one or more second magnetic elements  620  in  FIG.  5   ) positioned in the first composite material sheet. The cover may further include one or more third magnetic elements (e.g., the one or more third magnetic elements  630  in  FIG.  5   ) positioned in the third composite material sheet. The plurality of first magnetic elements applies attractive forces between the first plate and the electronic device. The one or more second magnetic elements and the one or more third magnetic elements may overlap one another and apply the attractive forces between the first plate and the third plate when the first plate and the third plate define an angle of 0 degree. 
     According to various embodiments of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) disposed at the side opposite to the third plate (e.g., the third plate  530  in  FIG.  5   ) and configured to be rotatable relative to the second plate (e.g., the second plate  520  in  FIG.  5   ). The first plate (e.g., the first plate  510  in  FIG.  5   ) may be formed so as not to be expanded to the area in which the fourth plate overlaps one surface (e.g., the rear surface  201  in  FIG.  4   ) when the second plate and the fourth plate define an angle of 180 degrees. 
     According to various embodiments of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include one or more fourth magnetic elements (e.g., the one or more fourth magnetic elements  640  in  FIG.  5   ) positioned in the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The one or more fourth magnetic elements may overlap one or more magnetic elements included in the electronic device and apply the attractive force when the second plate and the fourth plate define an angle of 180 degrees. 
     According to various embodiments of the present disclosure, the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) may further include the recess (e.g., the recess  104  in  FIG.  4  or  5   ) configured to accommodate the pen input device (e.g., the pen input device  400  in  FIG.  4   ) positioned on one surface (e.g., the rear surface  201  in  FIG.  4   ) when the second plate (e.g., the second plate  520  in  FIG.  5   ) and the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ) define an angle of 180 degrees. 
     According to various embodiments of the present disclosure, the cover (e.g., the cover  100  in  FIG.  5   ) may further include at least one sheet (e.g., the first sheet  810  and/or the second sheet  820  in  FIG.  5   ) attached to the second plate (e.g., the second plate  520  in  FIG.  5   ), the third plate (e.g., the third plate  530  in  FIG.  5   ), and the fourth plate (e.g., the fourth plate  540  in  FIG.  5   ). The at least one sheet may have the folding part (e.g., the first folding part F 1  and/the third folding part F 3  in  FIG.  5   ) between the second plate and the third plate, and another folding part (e.g., the second folding part F 2  and/or the fourth folding part F 4  in  FIG.  5   ) between the second plate and the fourth plate. 
     The embodiments of the present disclosure disclosed in the present specification and illustrated in the drawings are provided as particular examples for easily explaining the technical contents according to the embodiment of the present disclosure and helping understand the embodiment of the present disclosure, but not intended to limit the scope of the embodiment of the present disclosure. Accordingly, the scope of the various embodiments of the present disclosure should be interpreted as including all alterations or modifications derived from the technical spirit of the various embodiments of the present disclosure in addition to the disclosed embodiments.