JP5922726B2 - Bending structure of electronic equipment and electronic equipment - Google Patents

Description

  The present invention relates to a bending structure for bending two rigid parts, and further relates to a bending structure based on a new design concept that can replace the hinge mechanism of an electronic device.

  For portable electronic devices such as notebook personal computers (notebook PCs), smartphones, tablet terminals, and mobile phones, the housing can take a plurality of postures in use or display in use In some cases, a hinge structure is provided for opening a casing on which a keyboard is mounted and closing the casing in a storage state.

  Patent Document 1 discloses a hinge device employed in a portable information processing apparatus. The hinge device includes a plurality of pivot shafts in which three or more rhombus-shaped intermediate members are coupled so as to be pivotable with respect to each other. Patent Document 2 discloses a bending-regulating planar material used for a tablet-type mobile terminal. The planar material is composed of a resin rod-like member arranged on a continuous sheet having flexibility and resilience with a gap between each other by a shape or an arrangement interval.

JP 2000-186710 A JP 2012-190321 A

  FIG. 12 is a diagram for explaining an example of a general hinge mechanism employed by the notebook PC 10. In the notebook PC 10, a display housing 11 that houses a display, an antenna, and the like and a system housing 13 that houses a mother board, a storage device, and the like on which system devices are mounted are coupled to each other by hinge mechanisms 15a and 15b. The hinge mechanisms 15a and 15b include a torque mechanism that generates an appropriate torque for stopping the display housing 11 at an arbitrary position.

  12A is a perspective view, FIG. 12B is a rear view of the display housing 11 closed, and FIG. 12C is a partial side view of the display housing 11 opened. FIG. 12D is a partial side view when the display housing 11 is opened up to 180 degrees. Clearances 17a and 17b are formed in the attachment portions of the hinge mechanisms 15a and 15b between the system housing 13 and the free space necessary for rotation.

  The gaps 17 a and 17 b also serve as places where water and dust enter the system housing 13. A necessary space for rotation is also formed as a gap 19 at the ends of the display housing 11 and the system housing 13. The size of the gaps 17a, 17b, and 19 changes depending on whether the display housing 11 is open or closed. Therefore, particularly in the case of a child with a small finger, when the display housing 11 is opened or closed by mistake, It cannot be said that there is no possibility of pinching.

  FIG. 13 is a diagram for explaining an example of a general hinge mechanism adopted by the tablet terminal 30. In the tablet terminal 30, independent housings 31 a and 31 b each housing a touch screen are coupled by hinge mechanisms 33 a and 33 b. Such a tablet terminal 30 has the same problem as the notebook PC 10.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bending mechanism with improved safety that can be employed in electronic equipment. Furthermore, the objective of this invention is providing the bending mechanism excellent in the beauty | look. A further object of the present invention is to provide a bending mechanism in which foreign matter does not easily enter the inside of the housing. Furthermore, the objective of this invention is providing the portable electronic device and bending method which employ | adopted such a bending mechanism.

  The bending mechanism according to the present invention includes a hinge mechanism that includes a plurality of rotation shafts and is coupled to the first body and the second body, and an elastic cover that covers a surface of the hinge mechanism. Since the hinge mechanism includes a plurality of rotating shafts, it forms a bent portion where the envelope curve smoothly curves with respect to the elastic cover when bent. By covering the surface of the hinge mechanism, the elastic cover can prevent foreign matter from entering the main body and finger scissors. By arranging a plurality of control pieces made of a material having rigidity higher than that of the elastic cover so as to be embedded in the elastic cover, the surface of the elastic cover can be smoothly curved along the envelope of the hinge mechanism at the bent portion. .

  By arranging the control piece between the adjacent rotating shafts, the bending mechanism can be made thin. By making the cross-sectional area of each control piece on the end side larger than the cross-sectional area of the central part, it is possible to prevent the elastic cover from being bent in the direction of the rotation axis on the end side. The bending mechanism can be bent in two directions from an unbent rotation reference state. At this time, a plurality of control pieces can be arranged on both sides of the rotation reference plane.

  The elastic cover and the control piece can be formed by insert injection molding using a liquid elastic material. At this time, if the elastic cover covers the first main body, the second main body, and the hinge mechanism, a seamless structure can be realized by eliminating the boundary between the region corresponding to the bent portion of the elastic cover and the region corresponding to the main body. Can do. By forming a plurality of control holes for suppressing the outward bulge in the side wall of the elastic cover corresponding to the hinge mechanism, the bulge of the side wall can be suppressed.

  According to the present invention, it is possible to provide a bending mechanism with improved safety that can be employed in an electronic device. Furthermore, according to the present invention, a bending mechanism having an excellent aesthetic appearance can be provided. Furthermore, according to the present invention, it is possible to provide a bending mechanism in which foreign matter hardly enters the inside of the housing. Furthermore, according to the present invention, a portable electronic device and a bending method employing such a bending mechanism can be provided.

3 is an exploded perspective view for explaining an example of a basic configuration of a bending mechanism 90. FIG. It is a figure for demonstrating the bending mechanism 90 of the assembled state. 4 is a diagram for explaining a configuration of a control piece group 200. FIG. It is sectional drawing for demonstrating the behavior of the bending mechanism which does not provide control piece group 200,500. It is sectional drawing for demonstrating the behavior of the bending mechanism 11 which does not provide the control piece groups 200 and 500. FIG. It is sectional drawing for demonstrating the behavior of the bending mechanism 90 provided with control piece group 200,500. It is sectional drawing for demonstrating the behavior of the bending mechanism 90 provided with control piece group 200,500. 5 is a plan view for explaining the function of a control hole 105. FIG. It is a figure for demonstrating notebook PC600 to which the bending mechanism 90 is applied. It is a figure for demonstrating the tablet terminal 700 to which the bending mechanism 90 is applied. It is a figure for demonstrating the separation-type portable computer 800 to which the bending mechanism 90 is applied. It is a figure for demonstrating a general hinge mechanism. It is a figure for demonstrating a general hinge mechanism.

  FIG. 1 is an exploded perspective view for explaining an example of a basic configuration of a bending mechanism 90 according to the present embodiment. FIG. 2 is a view for explaining the bending mechanism 90 in an assembled state. FIG. 3 is a diagram for explaining the configuration of the control piece group 500. Since the bending mechanism 90 can be applied to various electronic devices, it is not necessary to limit the application. However, here, the bending mechanism 90 is applied to a portable electronic device from the viewpoint of aesthetic requirements, improved safety during operation, and suppression of foreign matter intrusion. The case of applying will be described as an example.

  1, the bending mechanism 90 has a structure in which an elastic cover 100a, main bodies 401a and 401b, a control piece group 200, a hinge mechanism 300, a control piece group 500, main bodies 403a and 403b, and an elastic cover 100b are stacked from above. . The elastic covers 100a and 100b are formed of an elastic material such as silicon rubber. The material of the elastic covers 100a and 100b need not be limited to silicon rubber as long as it has elasticity, resilience, strength, and other environmental characteristics suitable for the application.

  The elastic covers 100a and 100b cover the entirety of the main bodies 401a and 401b, the control piece group 200, the hinge mechanism 300, the control piece group 500, and the main bodies 403a and 403b in an assembled state. Alternatively, the elastic covers 100a and 100b may cover only the bent portion 91 (FIG. 2). In this case, a boundary is formed between the bent portion 91 and the non-bent portions 93 and 95 (FIG. 2).

  The group of the main bodies 401a and 403a, the group of the main bodies 401b and 403b, and the corresponding regions of the elastic covers 100a and 100b constitute non-bent portions 93 and 95 that are the objects to be bent by the bent portion 91. The main bodies 401a, 401b, 403a, and 403b can be formed of a metal material such as a magnesium alloy or an aluminum alloy, a plastic, a fiber reinforced plastic reinforced with carbon fiber or glass fiber, or a composite material that combines them.

  When the bending mechanism 90 is applied to the notebook PC 10 (FIG. 12), the set of the main bodies 401a and 403a can correspond to the display casing 11, and the set of the main bodies 401b and 403b can correspond to the system casing 13. When the bending mechanism 90 is applied to the smartphone 30 (FIG. 13), the set of the main bodies 401a and 403a can be made to correspond to one housing 31a, and the set of the main bodies 401b and 403b can be made to correspond to the other housing 31b. .

  The region of the hinge mechanism 300 and the corresponding elastic covers 100a and 100b constitutes a bent portion 91. As an example, the hinge mechanism 300 includes fixing portions 305a and 305b for fixing to the main bodies 403a and 403b, a hinge piece group 301 disposed between the fixing portions 305a and 305b, and a plurality of connecting portions 303a and 303b. . Each of the plurality of cylindrical hinge pieces 301a to 301h (FIG. 3) constituting the hinge piece group 301 includes a rotation shaft, and adjacent hinge pieces can rotate about each rotation shaft. Therefore, when the bending part 91 bends, the hinge piece group 301 draws a smooth curve on the outer and inner envelopes at the time of bending in the cross section.

  When the hinge mechanism 300 is not bent, the respective rotation axes exist on the same plane. On this plane, an X axis is defined in a direction perpendicular to the rotation axis, a Y axis is defined in a direction parallel to the rotation axis, and a Z axis is defined in a direction perpendicular to the XY plane. The state of the bending mechanism 90 when all the rotation axes exist in the XY plane is referred to as a rotation reference state, and the XY plane at this time is referred to as a rotation reference surface 97 (FIG. 2). A curved surface connecting the rotation axes when the bent portion 91 is bent is referred to as a rotation surface 98 (FIG. 7).

  Each of the control piece groups 200 and 500 includes a plurality of control pieces. The control piece groups 200 and 500 are made of a plastic material such as polycarbonate (PC) or PC / ABS resin, or a metal such as an aluminum alloy or a magnesium alloy in order to control the deformation amount of the elastic covers 100a and 100b when the bent portion 91 is bent. The elastic cover 100a, 100b, such as a material, is formed of a material having higher rigidity. Control pieces 500a to 500g (FIG. 3) are fitted into a plurality of elongated recesses 101 extending in the Y-axis direction formed inside the elastic covers 100a and 100b, respectively, and main bodies 403a and 403b are fitted into the recesses 103a and 103b. It has a structure.

  The structure to be fitted here means a structure in which the main bodies 403a and 403b and the control piece group 500 do not slide and move freely on the XY plane while the bending mechanism 90 is bent. In the present embodiment, the main bodies 403a and 403b and the control piece group 500 are inserted in advance at predetermined positions inside the mold cavity, and liquid silicone rubber is insert injection molded, whereby the main bodies 403a and 403b are controlled. An inset structure is realized by integrally molding the piece group 500 and the elastic cover 100b. Similarly, the main bodies 401a and 401b, the control piece group 200, and the elastic cover 100a can be integrally formed.

  3A is a plan view of the main bodies 403a and 403b, the control piece group 500, and the elastic cover 100b integrally formed by insert injection molding, and FIG. 3B is an AA arrow in FIG. 3A. FIG. 3C is an enlarged partial cross-sectional view taken along the line BB in FIG. 3A. FIG. 3B shows hinge pieces 301a to 301h and connecting members 303a and 303b constituting the hinge piece group 301 by dotted lines. The hinge pieces 301a to 301h are columnar members that can generate an appropriate rotational torque at the ends.

  Starting from a hinge piece 301a coupled to the fixed portion 305b in the X-axis direction, a pair of adjacent hinge pieces 301a and 301b, a group of 301c and 301d, a group of 301e and 301f, and a group of 301g and 301h are connected members 303b, respectively. Both ends are pivotally coupled. Also, starting from the hinge piece 301b, adjacent pairs of hinge pieces 301b and 301c, 301d and 301e, and 301f and 301g are respectively coupled by a connecting member 303b so that both ends are rotatable.

  As a result of such a configuration, each of the hinge pieces 301a to 301h is independently rotated about the rotation axis of the adjacent hinge piece, and the bent portion 91 has a rotation reference plane as shown in FIG. It can be rotated in two directions from 97. The independent control pieces 500a to 500g constituting the control piece group 500 are arranged in parallel to the hinge piece group 301 (parallel to the Y axis) and at equal intervals in the X axis direction.

  In order to avoid unevenness on the surface of the elastic cover 100b, the control piece group 500 prevents the inner surface of the elastic cover 100b from coming into contact with the hinge piece group 301 when in the rotation reference state. The position of each control piece 500a to 500g in the X-axis direction is not necessarily at the center between the rotation axes of the adjacent hinge pieces, but if arranged at the center, the control piece group 500 is hinged in the rotation reference state. Since the rotation reference surface 97 can be brought close to the group 301 without contacting the group 301, it is effective in reducing the thickness of the bending mechanism. The structures of the elastic cover 100a and the control piece group 200 are also the same.

  Each of the control pieces 500a to 500g is a rectangular bar-shaped member having an example of a cross section, and ribs 501a to 501g are formed on both ends. The ribs 501a to 501g prevent the bent portion 91 from bending in the Y-axis direction. Therefore, instead of the ribs 501a to 501g, other structures that increase the cross-sectional areas of the control pieces 500a to 500g may be adopted. The shape of the surface close to the surface of the elastic cover 100b of the control pieces 500a to 500g is such that the surface of the elastic cover when the degree of bending of the bent portion 91 is large is an ideal curved surface shape along the envelope of the hinge piece group 301 You may make it a curved surface so that it may approach. The structures of the elastic cover 100a and the control piece group 200 are also the same.

  4 and 5 are cross-sectional views for explaining the behavior of the bending mechanism 11 (FIG. 5) without the control piece groups 200 and 500. FIG. 4 shows a state in which compressive stress and tensile stress are applied in the length direction to a plate-like member 50 having a length L1 made of silicon rubber. Since silicon rubber undergoes almost no change in volume when elastically deformed by externally applied stress, it deforms as shown in FIG. 4B for compressive stress and FIG. 4C for tensile stress. ) Becomes longer in the pulling direction and the thickness decreases.

  5A is a cross-sectional view showing a rotation reference state of the bending mechanism 11 configured without the control piece groups 200 and 500 provided in the bending mechanism 90 of FIG. 1, and FIG. 5B shows the bent state. It is sectional drawing shown. When the bending mechanism 11 is bent as shown in FIG. 5B, tensile stress is generated in the elastic cover 100a and compressive stress is generated in the elastic cover 100b. As shown in FIG. 4C, the elastic cover 100 a extends in the pulling direction and decreases in thickness, and the surface of the elastic cover 100 a approaches the hinge piece group 301.

  As a result, the region corresponding to the bent portion 91 of the elastic cover 100a is in a state where the outline of the hinge piece group 301 is visible or feels uncomfortable when touched with a finger. A sense of unity between the surfaces corresponding to the regions 93 and 95 and the region corresponding to the bent portion 91 is lost, which is not preferable from an aesthetic point of view. The elastic cover 100b is not aesthetically pleasing because it is compressed as shown in FIG. 4B and is deformed so as to swell inside or become wrinkles.

  6 and 7 are cross-sectional views for explaining the behavior of the bending mechanism 90 provided with the control piece groups 200 and 500. FIG. FIG. 6 shows a compressive stress and a longitudinal stress applied to a plate-like member 60 produced by alternately arranging layers 63 of silicon rubber and layers 61 of a highly rigid material corresponding to the control piece groups 200 and 500. The state when tensile stress is applied is shown. When compressive stress is applied to the plate-like member 60, as shown in FIG. 6B, the layer 61 of high rigidity material hardly deforms and only the silicon rubber layer 63 deforms. However, since the length L in the compression direction is shorter than the length L1 of the plate-like member 50, the silicon rubber layer 63 does not swell greatly as shown in FIG.

  At this time, the layer 61 of the highly rigid material controls the amount and direction of deformation of the silicon rubber layer 63 by making the length L in the compression direction of the silicon rubber layer 63 shorter than L1. With respect to the tensile stress, as shown in FIG. 6C, the layer 61 of a highly rigid material hardly deforms, but the thickness of the silicon rubber layer 63 decreases. The uniform plate-like member 50 shown in FIG. 4C has a small overall thickness, but the plate-like member 60 shown in FIG. 6C is an element formed by a layer 61 of a highly rigid material. And a thin layer formed by the silicon rubber layer 63 are alternately generated. The bending mechanism 90 uses this principle to control the surface of the bending portion 91 to be a smooth curved surface during bending.

  When the bending structure 90 in the rotation reference state shown in FIG. 7A is bent in the direction of FIG. 7B, a tensile stress is generated in the outer elastic cover 100a, as in FIG. 5B. In addition, a compressive stress is generated in the inner elastic cover 100b. The elastic cover 100a extends in the pulling direction as shown in FIG. 6C, and the control piece group 200 contacts the hinge piece group 301.

  As shown in FIG. 7C, the surface 111a in the region of the elastic cover 100a corresponding to the specific control piece is restrained from moving in the direction of the rotation surface 98 by the control piece group 200. Further, the surface 113a of the region of the elastic cover 100a corresponding between the control pieces is restrained from moving in the direction of the rotation surface 98 by the two control pieces on both sides. Therefore, the surface of the elastic cover 100a does not approach the hinge piece group 301 to the extent that the outline of the hinge piece group 301 appears as shown in FIG.

  As shown in FIG. 7D, the elastic cover 100b that receives compressive stress maintains the shape of the surface 111b of the region corresponding to the control piece group 500, and the surface 113b of the region corresponding to the space between the control pieces. Swells slightly as shown in FIG. At this time, since the length in the X-axis direction is short, the surface 113b is deformed only between the adjacent control pieces, and does not swell greatly or become wrinkled as shown in FIG. Since the relationship between the hinge piece group 301 and the control piece groups 200 and 500 is symmetrical with respect to the rotation reference plane 97, a compressive stress is generated in the elastic cover 100a when bent in the opposite direction. The elastic cover 100b exhibits a similar behavior when a tensile stress is generated.

  FIG. 8 is a plan view for explaining the function of the plurality of control holes 105 provided in the side wall 107 in the region corresponding to the bent portion 91 of the elastic cover 100b shown in FIG. 8A and 8B show the side wall 107a without a control hole, and FIGS. 8C and 8D show the side wall 107 of FIG. 2 provided with a plurality of control holes 105 in the X-axis direction. Yes. If the both ends of the side wall 107a are bent from the rotation reference state of FIG. 8A with the dotted line as the center, a compressive stress is generated inside the side wall 107a.

  Since one side surface of the side wall 107a is in contact with the ribs 501a to 501g (FIG. 2), the side wall 107a subjected to the compressive stress swells outward as shown in FIG. 8B. On the other hand, when the side wall 107 provided with the control hole 105 is bent about the position of the dotted line from the rotation reference state of FIG. 8C, the plurality of control holes 105 absorb the compressive stress of the side wall 107. Therefore, as shown in FIG. 8D, the amount of outward bulge can be reduced.

  FIG. 9 is a diagram for explaining a notebook PC 600 to which the bending mechanism 90 is applied. In the notebook PC 600, a system casing 603 on which a keyboard 601 is mounted and a display casing 607 on which a touch screen 605 is mounted are coupled by a bent portion 91. 9A shows a state in which the display housing 607 is tilted to an appropriate angle and is used as a notebook PC, and FIG. 9B shows a state in which the display housing 607 is closed, and FIG. ) Shows a state in which the bending portion 91 is bent so that the system casing 603 and the display casing 607 are back to back and used as a tablet terminal.

  FIG. 10 is a diagram for explaining a tablet terminal 700 to which the bending mechanism 90 is applied. The tablet terminal 700 equipped with the touch screen 701 can be used in various postures by bending a part of the housing at the bending portion 91 and using it as a support base. FIG. 11 is a diagram for explaining a separation-type portable computer 800 to which the bending mechanism 90 is applied. The portable computer 800 includes a keyboard casing 801 on which a keyboard 803 is mounted and a tablet terminal 805 on which a touch screen 807 is mounted.

  The keyboard housing 801 includes a mounting portion 804 that is processed so that the cross-sectional shape of the end portion is U-shaped. The tablet terminal 805 can be bent at the bent portion 91 in the same manner as the tablet terminal 700 (FIG. 10). The tablet terminal 805 has a terminal at an end thereof, and is electrically connected to the system device of the keyboard housing 801 when inserted into the mounting portion 804. The tablet terminal 805 and the keyboard housing 801 may be connected wirelessly. The computer 800 can be used by separating the tablet terminal 805 and can be used as a constituent element of a notebook PC by being attached to the attachment portion 804. Further, at the time of coupling, the bent portion 91 can be bent and the tablet terminal 805 can be used at various positions.

  The bending mechanism 90 is a new design concept that maintains the same appearance in the bent portion 91 and the non-bent portions 93 and 95 in both the bent state and the rotation reference state, and does not allow the user to recognize the presence of the bent portion 91. Provide electronic equipment. Moreover, since the clearance which existed in the conventional hinge mechanism and housing | casing can be hidden with an elastic cover, safety | security can be improved further. Further, since the gap of the hinge mechanism is covered with the elastic cover, it is possible to prevent foreign matter from entering the inside of the housing.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

90 bending mechanism 91 bending part 93, 95 non-bending part 97 rotation reference surface 98 rotation surface 100a, 100b elastic cover 105 control hole 107 side wall 200, 500 control piece group 500a-500g control piece 300 hinge mechanism 301 hinge piece group 301a ˜301h Hinge pieces 303a and 303b coupling portions 305a and 305b coupling portions 401a, 401b, 403a and 403b

Claims (19)

A bending mechanism of an electronic device including a first body and a second body,
A hinge mechanism including a plurality of pivot shafts and coupled to the first body and the second body;
An elastic cover covering the surface of the hinge mechanism;
A bending mechanism having a plurality of control pieces arranged to be embedded in the elastic cover in order to control a deformation amount of the elastic cover when the hinge mechanism is bent . The bending mechanism according to claim 1, wherein the control piece is formed of a material having rigidity higher than that of the elastic cover. The bending mechanism according to claim 1 , wherein the control piece is disposed between the adjacent rotating shafts. The bending mechanism according to claim 1 , wherein a cross-sectional area of each control piece on an end side is larger than a cross-sectional area of a central part. The bending mechanism according to claim 1 , wherein the bending mechanism is bent in two directions from the rotation reference state. The bending mechanism according to claim 5, wherein the plurality of control pieces are arranged on both sides of a rotation reference surface formed in the rotation reference state .   The bending mechanism according to claim 1, wherein the elastic cover and the control piece are formed by insert injection molding using a liquid elastic material.   The bending mechanism according to claim 7, wherein the elastic cover covers the first body, the second body, and the hinge mechanism.   The bending mechanism according to claim 1, wherein a plurality of control holes are formed in a side wall of the elastic cover in a region corresponding to the hinge mechanism to suppress swelling in the direction of the rotation shaft. A first body,
A second body;
A hinge mechanism including a plurality of hinge pieces each having a rotation axis and coupled to the first body and the second body;
An elastic cover that covers surfaces of the first body, the second body, and the hinge mechanism;
A portable electronic device comprising: a plurality of control pieces arranged to be embedded in the elastic cover in order to control a deformation amount of the elastic cover when the hinge mechanism is bent . The portable electronic device, the portable electronic device according to claim 10 which is a notebook portable computer including a display housing corresponding to said first system casing corresponding to the main body the second body . The portable electronic device according to claim 10 , wherein the portable electronic device is a tablet terminal including a casing corresponding to the first main body and a support base corresponding to the second main body. A first main body including a touch screen; a second main body; a hinge mechanism including a plurality of pivot shafts and coupled to the first main body and the second main body; the first main body and the second main body; And a plurality of control pieces arranged so as to be embedded in the elastic cover in order to control the amount of deformation of the elastic cover when the hinge mechanism is bent. A terminal,
A portable electronic device having a keyboard and a keyboard housing having a mounting portion on which the second main body can be mounted. The portable electronic device according to claim 13 , wherein each of the second main body and the mounting portion includes a terminal that can be electrically connected when mounted. A method of bending a first block and a second block,
Coupling the first block and the second block with a hinge mechanism comprising a plurality of pivot axes;
Covering the surface of the first block, the second block, and the hinge mechanism with an elastic cover;
Controlling the deformation of the inner and outer sides of the elastic cover at the bent portion when the hinge mechanism is rotated. The step of controlling the deformation includes shortening the length of the elastic cover in a direction perpendicular to the rotation axis with a material having higher rigidity than the elastic cover embedded in the bent portion of the elastic cover. The method of claim 15 , comprising reducing the amount of inner deformation. The method according to claim 16 , further comprising the step of disposing the rigid material from the first block toward the second block at a predetermined interval. 16. The step of controlling the deformation according to claim 15 , wherein the step of controlling the deformation suppresses a material having a higher rigidity than the elastic cover embedded in the bent portion of the elastic cover from approaching the surface of the elastic cover in the direction of the rotation shaft. Method. The method of claim 18 , wherein the stiff material contacts the hinge mechanism to inhibit access.

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