Foldable electronic device

Abstract

Provided in the present application is a foldable electronic device. A functional device of the foldable electronic device is fixed to a first middle frame. The electronic device further comprises a first magnetic member, a second magnetic member and an auxiliary magnetic attraction member, wherein at least part of the auxiliary magnetic attraction member and the first magnetic member are fixed to the first middle frame, the second magnetic member is fixed to a second middle frame, the auxiliary magnetic attraction member comprises at least one of a magnetic portion and a metal portion, and the auxiliary magnetic attraction member is composed of a part of the structure of the functional device or a folding mechanism. When the electronic device is in a closed state, the first middle frame and the second middle frame are oppositely folded, a first portion of the second magnetic member directly faces the auxiliary magnetic attraction member, the second magnetic member attracts the auxiliary magnetic attraction member, a second portion of the second magnetic member directly faces the first magnetic member, and the second magnetic member attracts the first magnetic member. In the present application, the second magnetic member is configured to attract the auxiliary magnetic attraction member and the first magnetic member at the same time, so that a relatively high closing stability is achieved while taking into account the thinning of the electronic device.

Description

Foldable electronic devices

[0001] This application claims priority to the Chinese patent application with application number 202323276388.1 filed with the State Intellectual Property Office of China on November 30, 2023, and priority to the Chinese patent application with the invention name “Foldable Electronic Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of foldable electronic devices, and in particular to a foldable electronic device. Background Art

[0003] With the development of technology, foldable electronic devices are becoming increasingly common in people's daily lives. Current foldable electronic devices typically use one or more pairs of magnets to attract each other, providing the suction force required to close the device. However, as foldable devices become thinner, their internal space is shrinking, leading to a continuous reduction in the size of the magnets. Limited by their size, the suction force between the magnets is insufficient to meet the closing suction requirements of the device, resulting in poor closing stability and a poor user experience.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a foldable electronic device, aiming to provide an electronic device that can achieve both thinness and closure stability.

[0006] The present application provides a foldable electronic device. The foldable electronic device includes a first middle frame, a second middle frame, a folding mechanism, and a functional device. The folding mechanism connects the first middle frame and the second middle frame, and the functional device is fixed to the first middle frame. The electronic device also includes a first magnetic member, a second magnetic member, and an auxiliary magnetic member. At least part of the auxiliary magnetic member and the first magnetic member are fixed to the first middle frame, and the second magnetic member is fixed to the second middle frame. The auxiliary magnetic member includes at least one of a magnetic part or a metal part, and the auxiliary magnetic member is composed of a partial structure in the functional device or the folding mechanism. The electronic device has an open state and a closed state. When the electronic device is in the open state, the first middle frame and the second middle frame are relatively flattened. When the electronic device is in the closed state, the first middle frame and the second middle frame are relatively folded, the first part of the second magnetic member is facing the auxiliary magnetic member, the second magnetic member is attracted to the auxiliary magnetic member, the second part of the second magnetic member is facing the first magnetic member, and the second magnetic member is attracted to the first magnetic member.

[0007] It is understandable that, compared to some embodiments, when the electronic device is in a closed state, the first magnetic part and the second magnetic part of the electronic device overlap in projection in the thickness direction of the electronic device, and the two are attracted to each other to provide suction for the closure of the electronic device. By simultaneously increasing the size of the first magnetic part and the second magnetic part, the overlapping area of ​​the projections of the two in the first direction is increased, that is, the suction area of ​​the two is increased, thereby increasing the suction force between the two to meet the closing suction force requirements of the electronic device. However, the internal space of the electronic device is limited, and the first magnetic part and the second magnetic part are limited by size, resulting in a small suction area between the two. The suction force of the two cannot meet the closing suction force requirements of the electronic device, affecting the user experience.

[0008] When the electronic device in this embodiment is in a closed state, the first part of the second magnetic member can face the auxiliary magnetic member (also the magnetic member of the functional device in this embodiment), and the second magnetic member can generate a first attraction force with the auxiliary magnetic member. The second part of the second magnetic member can face the first magnetic member, and the second magnetic member can generate a second attraction force with the first magnetic member. In this way, the second magnetic member can simultaneously generate a first attraction force with the auxiliary magnetic member and a second attraction force with the first magnetic member. The closing attraction force of the electronic device is the sum of the first attraction force and the second attraction force. In other words, by setting the first part of the second magnetic member to face the auxiliary magnetic member and the second part of the second magnetic member to face the first magnetic member, this embodiment can increase the size of the first magnetic member and the second magnetic member by setting the second magnetic member to attract the auxiliary magnetic member and the first magnetic member at the same time, thereby increasing the attraction area between the second magnetic member and other components (also the first magnetic member and the auxiliary magnetic member in this embodiment), thereby effectively improving the closing attraction force of the electronic device when it is closed, meeting the closing attraction force requirements of the electronic device, improving the closing stability of the electronic device, and thus improving the user experience.

[0009] In one possible implementation, the functional device is a speaker or a vibration motor, and the functional device has at least one magnetic component, with the magnetic component of the functional device constituting at least part of the magnetic portion. This allows the magnetic components in the functional device to be reused, saving space within the electronic device.

[0010] In one possible implementation, the functional device is a speaker with a voice coil, and the magnetic component of the functional device is used to drive the voice coil of the functional device to vibrate; or the functional device is a vibration motor with a rotor, and the magnetic component of the functional device is used to drive the rotor of the functional device to rotate. In this way, the magnetic components of the functional device can be reused, which helps save internal space in the electronic device.

[0011] In one possible implementation, the first part fits the second part. It is understood that, compared to some embodiments in which the second magnetic member is divided into two independent parts, when the electronic device is in the closed state, the two parts of the second magnetic member are respectively facing the first magnetic member and the auxiliary magnetic member, that is, the two independent parts of the second magnetic member are attracted to the first magnetic member and the auxiliary magnetic member respectively. This requires that the two independent parts of the second magnetic member be assembled and fixed separately, making the assembly process more cumbersome. In this embodiment, the second magnetic member is a single integral structural member, and the first part of the second magnetic member can be connected to the second part, so that the second magnetic member only needs to be assembled and fixed once, the assembly process is relatively simple, and it is beneficial to improve the production efficiency of the electronic device. At the same time, when the electronic device is in the closed state, the second magnetic member can not only face the first magnetic member and the auxiliary magnetic member, but also face the gap between the first magnetic member and the auxiliary magnetic member. In this way, the larger size of the second magnetic member is beneficial to increase the first attraction between the second magnetic member and the first magnetic member, and increase the second attraction between the second magnetic member and the auxiliary magnetic member, thereby facilitating the increase of the closing attraction of the electronic device and improving the user experience.

[0012] In addition, compared to some embodiments, the second magnetic part is divided into two or more independent parts spaced apart from each other, and the second middle frame is provided with multiple grooves to accommodate the multiple parts of the second magnetic part in a one-to-one correspondence. The groove walls of the multiple grooves will occupy more space inside the electronic device, which reduces the space utilization rate inside the electronic device. In this embodiment, there is no gap between the first part and the second part of the second magnetic part, and the two can be regarded as an integral structural part, so that the second middle frame only needs to be provided with one groove to accommodate the second magnetic part. In this way, when the size of the second magnetic part is the same, the number of grooves in this embodiment is smaller, and the groove walls of the grooves occupy less space inside the electronic device, thereby freeing up more available space inside the electronic device to store other components, which is conducive to improving the space utilization rate inside the electronic device.

[0013] In a possible implementation, the first portion and the second portion are integrally formed, so that the second magnetic member 60 has a higher structural reliability.

[0014] In one possible implementation, the distance between the first magnetic member and the magnetic portion is greater than or equal to 0.2 mm. This allows for a greater distance between the first magnetic member and the magnetic portion, effectively preventing the first magnetic member from interfering with the normal operation of the magnetic portion, thereby ensuring the normal operation of the magnetic portion.

[0015] In one possible implementation, when the electronic device is closed, the first portion of the second magnetic member is spaced from the magnetic portion in a first direction by a first spacing, and the first spacing is greater than or equal to 1 mm. The first direction is the thickness direction of the electronic device when the electronic device is closed. This greater spacing between the second magnetic member and the magnetic portion effectively prevents the second magnetic member from interfering with the normal operation of the magnetic portion.

[0016] In a possible implementation, the first distance is greater than or equal to 2 mm. In this way, the second magnetic member has less interference with the magnetic portion.

[0017] In a possible implementation, when the electronic device is in a closed state, a distance between the second portion and the first magnetic component in the first direction is a second distance, and the second distance is smaller than the first distance.

[0018] It can be understood that, compared to electronic devices in which the first spacing and the second spacing are equal in some embodiments, in order to ensure that the second magnetic part can maintain a certain spacing distance from the magnetic part when the electronic device is in a closed state, the second magnetic part is smaller in size while ensuring the overall thickness of the electronic device, resulting in smaller first suction force and second suction force, affecting the closing experience of the electronic device. The second magnetic part in this embodiment forms a stepped surface on its surface facing the first middle frame and makes the second spacing smaller than the first spacing, thereby increasing the thickness of the second part while ensuring the spacing distance between the first part and the magnetic part, so as to increase the size of the second magnetic part. In other words, the electronic device in this embodiment, when its own thickness is the same and the first spacing is the same, by setting the second part of the second magnetic part to sink relative to the first part, the second spacing is smaller than the first spacing, so that the size of the second magnetic part can be increased while ensuring the first spacing, thereby effectively improving the first suction force to meet the closing suction force requirements of the electronic device and improving the user experience.

[0019] In one possible implementation, the functional device further includes a device housing, which is fixedly connected to the second middle frame. When the electronic device is in a closed state, the second magnetic member faces the device housing, and the second magnetic member and the device housing are attracted to each other. The portion of the device housing that is attracted to the second magnetic member constitutes at least part of the metal portion of the auxiliary magnetic member. In this way, the second magnetic member can attract not only the magnetic member of the functional device but also the device housing of the functional device, thereby increasing the closing suction force of the electronic device without increasing the size of the second magnetic member, which is beneficial for improving the closing stability of the electronic device.

[0020] In one possible implementation, the electronic device further includes a first back cover, a second back cover, and a magnetic sheet. The first back cover is fixedly connected to the first middle frame, the second back cover is fixedly connected to the second middle frame, and the magnetic sheet is fixed to at least one of the first back cover and the second back cover. When the electronic device is in a closed state, the first and second middle frames are folded relative to each other, the first back cover faces the second back cover, and the magnetic sheet is located between the first magnetic member and the second magnetic member, and / or the magnetic sheet is located between the magnetic portion of the auxiliary magnetic member and the second magnetic member.

[0021] It can be understood that in this embodiment, a magnetic sheet is provided, and when the electronic device is in a closed state, the magnetic sheet can be located between the first magnetic part and the second magnetic part, and / or, the magnetic sheet is located between the auxiliary magnetic part and the second magnetic part. In this way, when the first magnetic part, the second magnetic part and the auxiliary magnetic part are of the same size, the provision of a magnetic sheet can effectively enhance the suction force between the second magnetic part and the first magnetic part, and / or enhance the suction force between the second magnetic part and the auxiliary magnetic part, thereby improving the closing experience of the electronic device. When the suction force between the second magnetic part and the first magnetic part, and the suction force between the second magnetic part and the auxiliary magnetic part are of the same size, the provision of a magnetic sheet can reduce the thickness of the first magnetic part and / or the second magnetic part while meeting the closing suction force requirements of the electronic device, which is conducive to achieving a thin setting of the electronic device.

[0022] In one possible implementation, the magnetic sheet is embedded in at least one of the first and second rear covers. In this way, the magnetic sheet can enhance the first and second suction forces while not occupying space inside the electronic device, thereby facilitating a thinner electronic device.

[0023] In one possible implementation, the electronic device further includes a first back cover and a second back cover, the first back cover being fixedly connected to the first middle frame, the second back cover being fixedly connected to the second middle frame, the first middle frame being defined with a first groove, the opening of the first groove facing away from the first back cover, and the first magnetic member being received in the first groove. When the electronic device is in a closed state, the first middle frame and the second middle frame are folded relative to each other, the first back cover being located on a side of the first middle frame facing away from the second middle frame, and the second back cover being located on a side of the second middle frame facing away from the first middle frame.

[0024] It is understandable that, compared to an electronic device with a folding screen, the opening of the first groove faces the first back cover, so that there is still a portion of the middle frame between the first magnetic part and the second magnetic part, the distance between the first magnetic part and the second magnetic part is relatively far, and the suction force between the two is relatively small. In this embodiment, by setting the opening of the first groove to face away from the first back cover. In this way, when the electronic device is in the closed state, the opening of the first groove can face the second middle frame, so that the distance between the first magnetic part and the second magnetic part is relatively close, the suction force between the two is relatively large, which is conducive to improving the closing stability of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the implementation methods or background technologies of the present application, the drawings required for use in the implementation methods or background technologies of the present application will be described below.

[0026] FIG1 is a schematic structural diagram of an electronic device in an open state provided by an embodiment of the present application;

[0027] FIG2 is a schematic structural diagram of the electronic device shown in FIG1 in a closed state;

[0028] FIG3 is a schematic diagram of a partially exploded structure of the electronic device shown in FIG1 in some embodiments;

[0029] FIG4 is a partial cross-sectional structural diagram of an embodiment of the electronic device shown in FIG2 taken along line AA;

[0030] FIG5 is a schematic diagram of the assembly structure of a portion of the electronic device shown in FIG3 from another perspective;

[0031] FIG6 is a schematic diagram of the assembly structure of a portion of the electronic device shown in FIG3 from another perspective;

[0032] FIG7 is a schematic structural diagram of the structure shown in FIG3 in another embodiment;

[0033] FIG8 is a schematic diagram of a partial cross-sectional structure of an embodiment of the electronic device shown in FIG2 taken along line AA;

[0034] FIG9 is a schematic diagram of a partial structure of the electronic device shown in FIG2 ;

[0035] FIG10 is a schematic structural diagram of the structure shown in FIG9 from another perspective;

[0036] FIG11 is a schematic structural diagram of the structure shown in FIG8 in another embodiment;

[0037] FIG12 is a schematic structural diagram of the structure shown in FIG10 in another embodiment;

[0038] FIG13 is a schematic structural diagram of the second magnetic component of the electronic device shown in FIG3 from another perspective in yet another embodiment;

[0039] FIG14 is a schematic structural diagram of FIG8 in yet another embodiment;

[0040] FIG15 is a schematic diagram of a partial internal structure of another electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0042] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inside", "outside", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0043] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0044] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0045] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in another embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0046] It is understood that the specific embodiments described herein are only used to explain the relevant patent, rather than to limit the patent. It should also be noted that, for ease of description, only the parts related to the patent are shown in the drawings.

[0047] Fig. 1 is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application when in an open state. Fig. 2 is a schematic diagram of the structure of the electronic device 1000 shown in Fig. 1 when in a closed state.

[0048] As shown in Figures 1 and 2, the electronic device 1000 may include a housing device 100 and a screen 200. The screen 200 may be mounted on the housing device 100. The housing device 100 may be in an open state as shown in Figure 1, and in a closed state as shown in Figure 2. The housing device 100 may also be in an intermediate state between unfolding and folding. The intermediate state may be any state between the open state and the closed state. The screen 200 may move together with the housing device 100. The housing device 100 may drive the screen 200 to unfold or fold, so that the electronic device 1000 can unfold to an open state, or fold to a closed state. When the electronic device 1000 is in a closed state, the housing device 100 may be located on the inner side of the screen 200. In other words, the electronic device 1000 may be an electronic device 1000 with an outward-folding screen. In some embodiments, the electronic device 1000 may also be an electronic device with an inward-folding screen.

[0049] In this embodiment, when electronic device 1000 is in the open state, screen 200 can be flattened. In this case, screen 200 can display full screen, and electronic device 1000 has a larger display area, which is conducive to improving the user's viewing and operating experience. When electronic device 1000 is in the closed state, the planar size of electronic device 1000 is small, making it easy for users to carry and store.

[0050] Exemplarily, the screen 200 may be integrated with a display function and a touch sensing function. The display function of the screen 200 is used to display images, videos, etc., and the touch sensing function of the screen 200 is used to sense the user's touch actions to achieve human-computer interaction. Exemplarily, the screen 200 includes a flexible display screen that can be bent. Among them, the flexible display screen can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED) display screen, an active matrix organic light-emitting diode or an active matrix organic light-emitting diode (AMOLED) display screen, a flexible light-emitting diode (FLED) display screen, a MiniLED display screen, a MicroLED display screen, a Micro-OLED display screen, a quantum dot light-emitting diode (QLED) display screen, etc.

[0051] Fig. 3 is a schematic diagram of a partially exploded structure of the electronic device 1000 shown in Fig. 1 in some embodiments. Fig. 4 is a schematic diagram of a partial cross-sectional structure of the electronic device 1000 shown in Fig. 2 taken along line AA in one embodiment.

[0052] As shown in Figures 3 and 4, the housing device 100 may include a first housing 10, a second housing 20, and a folding mechanism 30. The folding mechanism 30 may connect the first housing 10 and the second housing 20. The folding mechanism 30 may move so that the first housing 10 and the second housing 20 can be relatively unfolded to an open state, or relatively folded to a closed state.

[0053] Exemplarily, the first housing 10 may include a first middle frame 11 and a first back cover 12. The first middle frame 11 may include a first frame 111 and a first middle plate 112. The first frame 111 may be connected to the outer peripheral sidewall of the first middle plate 112. The first back cover 12 may be fixedly connected to the first frame 111. The first middle frame 11 may be provided with a first groove 113 and a second groove 114 spaced apart. The opening of the first groove 113 and the opening of the second groove 114 may both face the first back cover 12.

[0054] Exemplarily, the second housing 20 may include a second middle frame 21 and a second back cover 22. The second middle frame 21 may include a second side frame 211 and a second middle plate 212. The second side frame 211 may be connected to the outer peripheral sidewalls of the second middle plate 212. The second back cover 22 is fixedly connected to the second side frame 211. The second middle frame 21 may be provided with a third groove 213. The opening of the third groove 213 may face the second back cover.

[0055] For example, when the electronic device is in a closed state, the first groove 113 and the second groove 114 of the first middle frame 11 can be stacked with the third groove 213 of the second middle frame 21 in a first direction. The first direction is the thickness direction of the electronic device 1000 when the electronic device is in a closed state.

[0056] It should be understood that the first housing 10 and the second housing 20 are both housing members used to mount and secure other components of the electronic device 1000 and have a variety of structures. The folding mechanism 30 is used to achieve relative movement between the first housing 10 and the second housing 20 and also has a variety of structures. The embodiments of this application do not strictly limit the specific structures of the first housing 10, the second housing 20, and the folding mechanism 30. The drawings of this application only illustrate the general structure of the first housing 10, the second housing 20, and the folding mechanism 30 in one embodiment.

[0057] It should be understood that Figures 1 to 4 only schematically illustrate some components included in the electronic device 1000, and the actual shape, size, and structure of these components are not limited by Figures 1 to 4. In other embodiments, when the electronic device 1000 is a device of other forms, the electronic device 1000 may also not include the screen 200.

[0058] In this embodiment, the electronic device 1000 is taken as an example of a two-fold structure, that is, the electronic device 1000 includes two flat parts and a bent part connected between the two flat parts. Among them, the two flat parts can be rotated toward each other to overlap each other (corresponding to the closed state in the previous text), so that the electronic device 1000 presents a two-layer form; the two flat parts can also be rotated away from each other to be flattened (corresponding to the open state in the previous text). In other embodiments, the electronic device 1000 can also be a structure that folds three or more, that is, the electronic device 1000 includes three or more flat parts, and two adjacent flat parts are connected by a bent part, and the two adjacent flat parts can be rotated relative to each other to overlap each other or rotated away from each other to be flattened. When the electronic device 1000 is a structure that folds three or more, the structure of the electronic device 1000 can be adaptively designed with reference to the description of the two-fold structure in this embodiment, and this application will not go into details about this.

[0059] Fig. 5 is a schematic diagram of the assembly structure of a portion of the electronic device 1000 shown in Fig. 3 from another perspective. Fig. 6 is a schematic diagram of the assembly structure of a portion of the electronic device 1000 shown in Fig. 3 from another perspective.

[0060] As shown in Figures 3, 5 and 6, the electronic device 1000 may further include a first magnetic member 40 and a functional device 50. Both the first magnetic member 40 and the functional device 50 may be fixed to the first middle frame 11. The material of the first magnetic member 40 may be a hard magnetic material, also known as a permanent magnetic material (permanent magnet) or a permanent magnetic material (permanent magnet), that is, the first magnetic member 40 may be a permanent magnet. The first magnetic member 40 may be housed in the first groove 113. The shape of the first groove 113 may be adapted to the shape of the first magnetic member 40. For example, the first magnetic member 40 may be fixedly connected to the bottom wall and the inner peripheral side wall of the first groove 113 by bonding or other means. In this way, the bonding area of ​​the first magnetic member 40 is larger, and the connection stability between the first magnetic member 40 and the first middle frame 11 is higher. At the same time, the first magnetic member 40 is housed in the first groove 113, which is beneficial to the positioning and assembly of the first magnetic member 40 on the one hand, and on the other hand, it can also prevent the glue of the first magnetic member 40 from overflowing during the bonding process, affecting the normal operation of other components in the first middle frame 11.

[0061] Exemplarily, the functional device 50 can be accommodated in the second groove 114. The shape of the second groove 114 can be adapted to the shape of the functional device 50. Among them, at least one magnetic part 51 can be provided inside the functional device 50 (illustrated by dotted lines in Figure 5). The functional device 50 can be a device with a magnetic part inside, such as a speaker. The functional device 50 in this embodiment is introduced by taking a speaker as an example. At this time, the magnetic part inside the speaker can constitute the magnetic part 51 of the functional device 50. For example, the magnetic part 51 of the functional device 50 can be a magnet in the magnetic circuit system inside the speaker, and the magnetic part 51 can be used to drive the voice coil of the speaker to vibrate. In some embodiments, the functional device 50 can also include a device housing 52. The device housing 52 can be fixedly connected to the groove wall of the second groove 114. The magnetic part 51 of the functional device 50 can be accommodated inside the device housing 52.

[0062] Exemplarily, the spacing between the first magnetic member 40 and the magnetic member 51 of the functional device 50 may be greater than or equal to 0.2 mm. The spacing between the first magnetic member 40 and the magnetic member 51 of the functional device 50 may be the minimum distance between the two. In this way, the spacing between the first magnetic member 40 and the magnetic member 51 of the functional device 50 is relatively large, thereby effectively preventing the first magnetic member 40 from interfering with the normal operation of the magnetic member 51 of the functional device 50, which is conducive to ensuring the normal operation of the functional device 50. In some embodiments, when multiple magnetic members 51 are provided inside the functional device 50, the spacing between the first magnetic member 40 and the magnetic member 51 of any one of the functional devices 50 may be greater than or equal to 0.2 mm.

[0063] Exemplarily, the electronic device 1000 may further include a second magnetic member 60. The second magnetic member 60 may be a permanent magnet. The second magnetic member 60 may be fixed to the second middle frame 21. The second magnetic member 60 may be accommodated in the third groove 213. The shape of the third groove 213 may be adapted to the shape of the second magnetic member 60. Exemplarily, the second magnetic member 60 may include a first portion 61 and a second portion 62. The first portion 61 may fit the second portion 62. The first portion 61 may also be integrally formed with the second portion 62, that is, the second magnetic member 60 may also be an integrally formed structural member. In this case, the second magnetic member 60 may be an independent permanent magnet. In some embodiments, the first portion 61 and the second portion 62 may be two independent small permanent magnets. The first portion 61 may be fixedly connected to the second portion 62 by bonding or other means to form an integral structural member with the second portion 62. Alternatively, the first portion 61 may also be spliced / lapped together with the second portion 62 to form an integral structural member with the second portion 62. In other words, there is no gap between the first portion 61 and the second portion 62 of the second magnetic member 60. In other embodiments, the first portion 61 and / or the second portion 62 may include a plurality of small permanent magnets. There is no gap between any two adjacent small permanent magnets, meaning that any two adjacent small permanent magnets can be connected together.

[0064] It should be noted that FIG3 and FIG6 and subsequent figures schematically divide the first portion 61 and the second portion 62 by dotted lines.

[0065] In some embodiments, the first middle frame 11 and / or the second middle frame 21 may further include more grooves for mounting and securing components such as a battery and a motherboard. In other embodiments, the first middle frame 11 may not include the first groove 113, the second groove 114, and the like, and the first magnetic member 40 and the functional component 50 may be directly secured to the first middle frame 11 by bonding or other means.

[0066] In other embodiments, as shown in FIG7 , the functional device 50 may also be a vibration motor. In this case, the magnetic member inside the vibration motor may constitute the magnetic member 51 of the functional device 50. The magnetic member 51 may be used to drive the rotor of the vibration motor to rotate.

[0067] Figure 8 is a partial cross-sectional structural diagram of an embodiment of the electronic device 1000 shown in Figure 2, taken along AA. Figure 9 is a partial structural diagram of the electronic device 1000 shown in Figure 2. Figure 10 is a structural diagram of the structure shown in Figure 9 from another perspective. It should be noted that the electronic device 1000 shown in Figures 9 and 10 both hide the first shell 10, the second shell 20 and the folding mechanism 30, and both use narrower dotted lines to indicate the obscured first magnetic part 40, and use wider dotted lines to indicate the obscured part of the functional device 50. For ease of understanding, Figures 9 and 10 also hide part of the device shell 52 of the functional device 50 to expose the magnetic part 51 of the functional device 50.

[0068] As shown in Figures 8 to 10, when the electronic device 1000 is in a closed state, the first housing 10 and the second housing 20 can be folded relative to each other. At this time, the first back cover 12 and the second back cover can both be located between the first middle frame 11 and the second middle frame 21. That is, the first middle frame 11, the first back cover 12, the second back cover 22, and the second middle frame 21 can be stacked in sequence along the first direction. The surface of the first back cover 12 facing away from the second back cover 22 is the first surface 121. The surface of the second back cover 22 facing away from the first back cover 12 is the second surface 221.

[0069] For example, when the electronic device 1000 is in a closed state, the second magnetic member 60 located in the third groove 213 and the first magnetic member 40 located in the first groove 113 at least partially overlap in their projections in the first direction. The second magnetic member 60 located in the third groove 213 and the magnetic member 51 of the functional device 50 located in the second groove 114 at least partially overlap in their projections in the first direction. Specifically, the first portion 61 of the second magnetic member 60 may directly face the magnetic member 51 of the functional device 50. The second portion 62 of the second magnetic member 60 may directly face the first magnetic member 40. In other words, when the electronic device 1000 is in a closed state, a portion of the projection of the second magnetic member 60 along the first direction may cover at least a portion of the first magnetic member 40, and a portion of the projection of the second magnetic member 60 along the first direction may also cover at least a portion of the magnetic member 51 of the functional device 50. In this case, the first magnetic member 40 and the second magnetic member 60 may attract each other, and the attractive force between them is the first attractive force. The magnetic member 51 of the functional device 50 and the second magnetic member 60 may attract each other, and the attractive force between them is the second attractive force. The closing suction force of the electronic device 1000 is the sum of the first suction force and the second suction force. The magnetic member 51 of the functional device 50 that generates suction with the second magnetic member 60 can constitute the auxiliary magnetic member of the electronic device 1000. That is, the suction force between the auxiliary magnetic member and the second magnetic member 60 is the second suction force. Exemplarily, the distance between the second magnetic member 60 and the magnetic member 51 of the functional device 50 in the first direction is a first distance D1. The first distance D1 can be greater than or equal to 1 mm. This creates a greater distance between the second magnetic member 60 and the magnetic member 51 of the functional device 50, effectively preventing the second magnetic member 60 from interfering with the normal operation of the magnetic member 51 of the functional device 50, thereby ensuring the normal operation of the functional device 50. It should be understood that the projection of a component along / in the first direction can be the projection of the component onto a reference plane perpendicular to the first direction. In this embodiment, the reference plane can be the first surface 121 of the first back cover 12. In some embodiments, the first distance D1 can also be greater than or equal to 2 mm. In this way, the second magnetic component 60 has less interference with the magnetic component 51 of the functional device 50 .

[0070] It is understandable that, compared to some embodiments, when the electronic device is in a closed state, the first magnetic part and the second magnetic part of the electronic device overlap in projection in the thickness direction of the electronic device, and the two are attracted to each other to provide suction for the closure of the electronic device. By simultaneously increasing the size of the first magnetic part and the second magnetic part, the overlapping area of ​​the projections of the two in the first direction is increased, that is, the suction area of ​​the two is increased, thereby increasing the suction force between the two to meet the closing suction force requirements of the electronic device. However, the internal space of the electronic device is limited, and the first magnetic part and the second magnetic part are limited by size, resulting in a small suction area between the two. The suction force of the two cannot meet the closing suction force requirements of the electronic device, affecting the user experience.

[0071] When the electronic device 1000 in this embodiment is in a closed state, the first part 61 of the second magnetic part 60 can face the auxiliary magnetic part (that is, the magnetic part 51 of the functional device 50 in this embodiment), and the second magnetic part 60 can generate a first suction force with the auxiliary magnetic part. The second part 62 of the second magnetic part 60 can face the first magnetic part 40, and the second magnetic part 60 can generate a second suction force with the first magnetic part 40. In this way, the second magnetic part 60 can simultaneously generate a first suction force with the auxiliary magnetic part and a second suction force with the first magnetic part 40. The closing suction force of the electronic device 1000 is the sum of the first suction force and the second suction force. In other words, this embodiment sets the first part 61 of the second magnetic part 60 to face the auxiliary magnetic part, and sets the second part 62 of the second magnetic part 60 to face the first magnetic part 40. This can increase the suction area between the second magnetic part 60 and other components (that is, the first magnetic part 40 and the auxiliary magnetic part in this embodiment) by setting the second magnetic part 60 to attract the auxiliary magnetic part and the first magnetic part 40 at the same time without increasing the size of the first magnetic part 40 and the second magnetic part 60, thereby effectively improving the closing suction force of the electronic device 1000 when it is in the closed state, meeting the closing suction force requirements of the electronic device 1000, improving the closing stability of the electronic device 1000, and thus improving the user experience.

[0072] Secondly, compared to some embodiments in which the second magnetic part is divided into two independent parts, when the electronic device is in a closed state, the two parts of the second magnetic part are respectively facing the first magnetic part and the auxiliary magnetic part, that is, the two independent parts of the second magnetic part are attracted to the first magnetic part and the auxiliary magnetic part respectively. This requires the two independent parts of the second magnetic part to be assembled and fixed separately, and the assembly process is more complicated. In this embodiment, the second magnetic part 60 is an integral structural part, and the first part 61 of the second magnetic part 60 can be connected to the second part 62, so that the second magnetic part 60 only needs to be assembled and fixed once, and the assembly process is relatively simple, which is conducive to improving the production efficiency of the electronic device 1000. At the same time, when the electronic device 1000 is in a closed state, in addition to facing the first magnetic part 40 and the auxiliary magnetic part, the second magnetic part 60 can also face the gap between the first magnetic part 40 and the auxiliary magnetic part. In this way, the second magnetic part 60 has a larger size, which is conducive to increasing the first suction force between the second magnetic part 60 and the first magnetic part 40, and increasing the second suction force between the second magnetic part 60 and the auxiliary magnetic part, thereby helping to increase the closed suction force of the electronic device and enhance the user experience.

[0073] In addition, compared to some embodiments, the second magnetic part is divided into two or more independent parts that are spaced apart from each other, and the second middle frame is provided with multiple grooves to accommodate multiple parts of the second magnetic part in a one-to-one correspondence. The groove walls of the multiple grooves will occupy more space inside the electronic device, which reduces the space utilization rate inside the electronic device. In this embodiment, there is no gap between the first part 61 and the second part 62 of the second magnetic part 60, and the two can be regarded as an integral structural member, so that the second middle frame 21 only needs to be provided with one groove (that is, the third groove 213 in this embodiment) to accommodate the second magnetic part 60. In this way, when the size of the second magnetic part 60 is the same, the number of grooves in this embodiment is smaller, and the groove walls of the grooves occupy less space inside the electronic device 1000, thereby freeing up more available space inside the electronic device 1000 to store other components, which is conducive to improving the space utilization rate inside the electronic device 1000.

[0074] In some embodiments, the auxiliary magnetic element may include both a magnetic portion and a metal portion. The magnetic element 51 of the functional device 50 may constitute at least a portion of the magnetic portion. The metal portion may be made of a metal material such as iron or stainless steel that can be magnetized by the magnetic element. The metal portion may be comprised of one or more metal portions within the device housing 52 of the functional device 50, such as a metal portion within the frame of the device housing 52, a metal portion within the plate of the device housing 52, or a metal portion within the connector of the device housing 52. When the electronic device 1000 is in a closed state, the second magnetic element 60 may face the first magnetic element 40, the second magnetic element 60 may face the magnetic portion of the auxiliary magnetic element, or the second magnetic element 60 may face the metal portion of the auxiliary magnetic element. The attractive force generated between the second magnetic element 60 and the magnetic portion of the auxiliary magnetic element is a first sub-attractive force. The attractive force generated between the second magnetic element 60 and the metal portion of the auxiliary magnetic element is a second sub-attractive force. The first and second sub-attractive forces may together constitute the first attractive force.

[0075] In other embodiments, the metal portion of the auxiliary magnetic member may also be formed from a portion of another component of the electronic device 1000, such as a metal portion of the back cover of the electronic device 1000, a metal portion of the shielding cover of the electronic device 1000, a metal portion of the heat pipe of the electronic device 1000, a metal portion of the folding mechanism 30 of the electronic device 1000, etc. In some other embodiments, the auxiliary magnetic member may also include only a metal portion.

[0076] Figure 11 is a schematic diagram of another embodiment of the structure shown in Figure 8. Figure 12 is a schematic diagram of another embodiment of the structure shown in Figure 10. It should be noted that the dot-dash line in Figure 12 indicates the obscured first magnetic sheet 70.

[0077] As shown in Figures 11 and 12, the electronic device 1000 may further include a magnetic sheet, for example, a first magnetic sheet 70. The first back cover 12 may be provided with a first groove 122. The opening of the first groove 122 may be formed on the first surface 121 of the first back cover 12. The first magnetic sheet 70 may be accommodated in the first groove 122 and fixedly connected to the first back cover 12. That is, the first magnetic sheet 70 may be embedded in the first back cover 12. In other embodiments, the first back cover 12 may not be provided with the first groove 122. The first magnetic sheet 70 may also be directly fixed to the first surface 121.

[0078] For example, when the electronic device 1000 is in a closed state, the first groove 122 can be stacked with the first groove 113 in the first direction. The first groove 122 can also be stacked with the second groove 114 in the first direction. A portion of the first magnetic sheet 70 can be located between the second magnetic part 60 and the first magnetic part 40, and a portion of the first magnetic sheet 70 can be located between the second magnetic part 60 and the magnetic part 51 of the functional device 50. At this time, the first magnetic sheet 70 located in the first groove 122 and the first magnetic part 40 located in the first groove 113 are projected at least partially overlapping in the first direction. The first magnetic sheet 70 located in the first groove 122 and the magnetic part 51 of the functional device 50 located in the second groove 114 are projected at least partially overlapping in the first direction.

[0079] It will be appreciated that in this embodiment, by providing the first magnetic sheet 70, a portion of the first magnetic sheet 70 can be positioned between the first magnetic member 40 and the second magnetic member 60, and a portion of the first magnetic sheet 70 can also be positioned between the auxiliary magnetic member and the second magnetic member 60 when the electronic device 1000 is in the closed state. Thus, when the first magnetic member 40, the second magnetic member 60, and the auxiliary magnetic member are of the same size, providing the first magnetic sheet 70 can effectively enhance the suction force between the second magnetic member 60 and the first magnetic member 40 (i.e., the first suction force), as well as the suction force between the second magnetic member 60 and the auxiliary magnetic member (i.e., the second suction force), thereby improving the closing experience of the electronic device 1000. When the first and second suction forces are of the same magnitude, providing the first magnetic sheet 70 can reduce the thickness of the first magnetic member 40 and / or the second magnetic member 60 while meeting the closing suction force requirements of the electronic device 1000, thereby facilitating a thinner design for the electronic device 1000.

[0080] Secondly, the first rear cover 12 of this embodiment further has a first groove 122 for accommodating the first magnetic sheet 70. In this way, the first magnetic sheet 70 can enhance the first and second suction forces while not occupying space inside the electronic device 1000, thereby facilitating a thinner configuration of the electronic device 1000.

[0081] In some embodiments, when the electronic device 1000 is in a closed state, the first magnetic sheet 70 may also be located only between the first magnetic component 40 and the second magnetic component 60, or the first magnetic sheet 70 may also be located only between the second magnetic component 60 and the auxiliary magnetic component.

[0082] In other embodiments, the first magnetic sheet 70 can also be fixed to the second back cover 22. In some other embodiments, the electronic device 1000 can also include a second magnetic sheet. The first magnetic sheet 70 can be fixed to the first back cover 12. The second magnetic sheet can be fixed to the second back cover 22.

[0083] Fig. 13 is a schematic diagram of the structure of the second magnetic member 60 of the electronic device 1000 shown in Fig. 3 in another embodiment from another perspective. Fig. 14 is a schematic diagram of the structure of Fig. 8 in another embodiment.

[0084] As shown in Figures 13 and 14, when the electronic device 1000 is in a closed state, the first part 61 can cover at least a portion of the magnetic part 51 of the functional device 50 when projected along the first direction. The second part 62 can cover at least a portion of the first magnetic part 40 when projected along the first direction. The spacing between the first part 61 and the magnetic part 51 of the functional device 50 in the first direction is a first spacing D1. The first spacing D1 can be greater than or equal to 1 mm. The spacing between the second part 62 and the first magnetic part 40 is a second spacing D2. The second spacing D2 can be smaller than the first spacing D1. At this time, the surface of the second part 62 facing the first middle frame 11 can be closer to the first middle frame 11 than the surface of the first part 61 facing the second middle frame 21. In other words, the surface of the second magnetic part 60 facing the first middle frame 11 can form a stepped surface.

[0085] It is understandable that, compared to the electronic device 1000 in some embodiments where the first distance D1 and the second distance D2 are equal, in order to ensure that the second magnetic member 60 can maintain a certain spacing distance from the magnetic member 51 of the functional device 50 when the electronic device 1000 is in a closed state (that is, the first distance D1 is greater than or equal to 1 mm), the second magnetic member 60 is smaller in size while ensuring the overall thickness of the electronic device 1000, resulting in smaller first and second suction forces, which affects the closing experience of the electronic device 1000. In this embodiment, the second magnetic member 60 forms a stepped surface on its surface facing the first middle frame 11 and makes the second distance D2 smaller than the first distance D1. This can increase the thickness of the second portion 62 while ensuring the spacing distance between the first portion 61 and the magnetic member 51 of the functional device 50, thereby increasing the size of the second magnetic member 60. In other words, when the first distance D1 is the same, the electronic device 1000 in this embodiment sets the second part 62 of the second magnetic part 60 to sink relative to the first part 61 so that the second distance D2 is smaller than the first distance D1. This can increase the size of the second magnetic part 60 while ensuring the first distance D1, thereby effectively improving the first suction force to meet the closed suction force requirements of the electronic device 1000 and enhance the user experience.

[0086] FIG15 is a schematic diagram of a partial internal structure of another electronic device provided in an embodiment of the present application.

[0087] As shown in Figure 15, the structure of the electronic device 1000 in this embodiment is roughly the same as the structure of the electronic device 1000 shown in Figure 8, and the same parts are not repeated here. The difference is that the electronic device 1000 in this embodiment can also be an electronic device 1000 with an inward folding screen. When the electronic device 1000 is in a closed state, the first groove 113 of the first middle frame 11, the second groove 114 of the first middle frame 11, and the third groove 213 of the second middle frame 21 can all be located between the first back cover 12 and the second back cover 22. Among them, the opening of the first groove 113 can face the second middle frame 21, that is, the opening of the first groove 113 can face away from the first back cover 12. The opening of the second groove 114 can face the first back cover 12. The opening of the third groove 213 can face the first middle frame 11, that is, the opening of the third groove 213 can face away from the second back cover 22. In this way, compared to an electronic device with an inward-folding screen, the opening of the first groove faces the first back cover, and the opening of the third groove faces the second back cover, so that there is still a part of the middle frame between the first magnetic part and the second magnetic part, the distance between the first magnetic part and the second magnetic part is relatively far, and the suction force between the two is relatively small. In this embodiment, by setting the opening of the first groove 113 to face away from the first back cover 12, and setting the opening of the third groove 213 to face away from the second back cover 22. In this way, when the electronic device 1000 is in a closed state, the opening of the first groove 113 can face the second middle frame 21, and the opening of the third groove 213 can face the first middle frame 11, so that the distance between the first magnetic part 40 and the second magnetic part 60 is relatively close, the suction force between the two is relatively large, which is conducive to improving the closing stability of the electronic device 1000.

[0088] In some embodiments, the first middle frame 11 may further include a through hole. The through hole may penetrate a portion of the bottom wall of the second groove 114 and communicate with the second groove 114. A portion of the functional device 50 may be exposed through the through hole. In this way, if the functional device 50 is a speaker, the through hole can avoid the vibration space of the speaker's diaphragm, facilitating a thinner design for the electronic device 1000.

[0089] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the scope of protection of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0090] It should be noted that all the above drawings are for illustrative purposes only and do not represent the actual size of the product. Furthermore, the dimensional ratios between the components in the drawings are not intended to limit the actual product of the present application.

[0091] The above are only some of the embodiments of this application, and the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A foldable electronic device (1000), characterized in that: It comprises a first middle frame (11), a second middle frame (21), a folding mechanism (30), and a functional device (50), wherein the folding mechanism (30) connects the first middle frame (11) and the second middle frame (21), and the functional device (50) is fixed to the first middle frame (11); The electronic device (1000) further comprises a first magnetic component (40), a second magnetic component (60) and an auxiliary magnetic component, wherein at least a portion of the auxiliary magnetic component and the first magnetic component (40) are fixed to the first middle frame (11), the second magnetic component (60) is fixed to the second middle frame (21), the auxiliary magnetic component comprises at least one of a magnetic part or a metal part, and the auxiliary magnetic component is composed of a partial structure of the functional device (50) or the folding mechanism (30); The electronic device (1000) has an open state and a closed state, and when the electronic device (1000) is in the open state, the first middle frame (11) and the second middle frame (21) are relatively flat; When the electronic device (1000) is in the closed state, the first middle frame (11) and the second middle frame (21) are folded relative to each other, the first part (61) of the second magnetic part (60) faces the auxiliary magnetic part, the second magnetic part (60) and the auxiliary magnetic part are attracted to each other, and the second part (62) of the second magnetic part (60) faces the first magnetic part (40), and the second magnetic part (60) and the first magnetic part (40) are attracted to each other.

2. The electronic device (1000) according to claim 1, characterized in that: The functional device (50) is a speaker or a vibration motor, and the functional device (50) has at least one magnetic part (51), and the magnetic part (51) of the functional device (50) constitutes at least part of the magnetic part.

3. The electronic device (1000) according to claim 2, characterized in that: The functional device (50) is a loudspeaker, the functional device (50) has a voice coil, and the magnetic component (51) of the functional device (50) is used to drive the voice coil of the functional device (50) to vibrate; Alternatively, the functional device (50) is a vibration motor, the functional device (50) has a rotor, and the magnetic component (51) of the functional device (50) is used to drive the rotor of the functional device (50) to rotate.

4. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: The first portion (61) fits the second portion (62).

5. The electronic device (1000) according to claim 4, characterized in that: The first part (61) and the second part (62) are integrally formed.

6. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: The distance between the first magnetic member (40) and the magnetic portion is greater than or equal to 0.2 mm.

7. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: When the electronic device (1000) is in the closed state, the distance between the first part (61) of the second magnetic part (60) and the magnetic part in the first direction is a first distance (D1), the first distance (D1) is greater than or equal to 1 mm, and the first direction is the thickness direction of the electronic device (1000) when the electronic device (1000) is in the closed state.

8. The electronic device (1000) according to claim 7, characterized in that: The first distance (D1) is greater than or equal to 2 mm.

9. The electronic device (1000) according to claim 7, characterized in that: When the electronic device (1000) is in the closed state, the distance between the second portion (62) and the first magnetic member (40) in the first direction is a second distance (D2), and the second distance (D2) is smaller than the first distance (D1).

10. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: The functional device (50) further comprises a device housing (52), wherein the device housing (52) is fixedly connected to the second middle frame (21); when the electronic device (1000) is in the closed state, the second magnetic component (60) faces the device housing (52), the second magnetic component (60) and the device housing (52) are attracted to each other, and the portion of the device housing (52) that is attracted to the second magnetic component (60) constitutes at least a portion of the metal portion of the auxiliary magnetic component.

11. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: The electronic device (1000) further comprises a first back cover (12), a second back cover (22) and a magnetic sheet, wherein the first back cover (12) is fixedly connected to the first middle frame (11), the second back cover (22) is fixedly connected to the second middle frame (21), and the magnetic sheet is fixed to at least one of the first back cover (12) and the second back cover (22); When the electronic device (1000) is in the closed state, the first middle frame (11) and the second middle frame (21) are folded relative to each other, the first back cover (12) faces the second back cover (22), the magnetic attraction sheet is located between the first magnetic component (40) and the second magnetic component (60), and / or the magnetic attraction sheet is located between the magnetic part of the auxiliary magnetic component and the second magnetic component (60).

12. The electronic device (1000) according to claim 11, characterized in that: The magnetic sheet is embedded in at least one of the first rear cover (12) and the second rear cover (22).

13. The electronic device (1000) according to any one of claims 1 to 3, characterized in that: The electronic device (1000) further comprises a first back cover (12) and a second back cover (22), the first back cover (12) being fixedly connected to the first middle frame (11), the second back cover (22) being fixedly connected to the second middle frame (21), the first middle frame (11) being provided with a first groove (113), the opening of the first groove (113) being facing away from the first back cover (12), and the first magnetic member (40) being received in the first groove (113); When the electronic device (1000) is in the closed state, the first middle frame (11) and the second middle frame (21) are folded relative to each other, the first back cover (12) is located on a side of the first middle frame (11) that is away from the second middle frame (21), and the second back cover (22) is located on a side of the second middle frame (21) that is away from the first middle frame (11).

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