Charging device and charging system of handwriting pen

Abstract

The invention provides a charging device and a charging system of a handwriting pen, relates to the technical field of charging equipment of the handwriting pen, and can improve the charging convenience of the handwriting pen. The charging device comprises a pen cap and a charging assembly. A cylindrical containing cavity is formed in the pen sleeve and used for containing a handwriting pen. The charging assembly comprises a first elastic piece and a second elastic piece, and the first elastic piece and the second elastic piece are arranged in the pen cap; the charging assembly charges the handwriting pen in the cylindrical containing cavity through the first elastic piece and the second elastic piece.

Description

Technical Field

[0001] This application relates to the technical field of charging devices for styluses, and particularly to a charging device and a charging system for a stylus. Background Art

[0002] Currently, with the increasing demand for office work on display devices such as mobile phones and tablet computers, styluses have gradually become important accessories for display devices.

[0003] Styluses include electromagnetic pens and capacitive pens. Capacitive pens are widely used because of their high sensitivity. However, a capacitive pen requires a battery to provide power to ensure its use. The battery has a limited stored power. After the capacitive pen is used for a period of time, it needs to be taken out of the pen case to replenish power through a power cord or a wireless charging device, so the charging convenience is relatively low. Summary of the Invention

[0004] This application provides a charging device and a charging system for a stylus, which can improve the charging convenience of the stylus and at the same time reduce the risk of the stylus being forgotten or lost.

[0005] To achieve the above object, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, a charging device for a stylus is provided. The charging device includes a pen case and a charging component. A cylindrical accommodating cavity is provided in the pen case for accommodating the stylus. The charging component includes a first elastic sheet and a second elastic sheet, and the first elastic sheet and the second elastic sheet are arranged in the pen case. The charging component charges the stylus in the cylindrical accommodating cavity by means of the first elastic sheet and the second elastic sheet.

[0007] In this way, the stylus can be charged in the pen case without being taken out of the pen case. Therefore, the charging convenience is relatively high, and the risk of the stylus being lost is relatively low. Moreover, the charging device supplies power to the stylus in a contact manner. Compared with the wireless charging method, the contact charging method has less power loss and can improve the charging efficiency of the charging device to the stylus.

[0008] Optionally, one end of the columnar placement cavity is open axially to form an opening. The stylus can be inserted into the columnar placement cavity through this opening or withdrawn from the columnar placement cavity through this opening. The first elastic piece includes a fixing portion, an elastic arm portion, and a contact portion. The fixing portion is fixed to the pen sleeve. The elastic arm portion includes opposite first and second ends. The first end is connected to the fixing portion, and the contact portion is connected to the second end. From the first end to the second end, the elastic arm portion extends away from the opening and inclines towards the center line of the columnar placement cavity. In this way, during the process of inserting the stylus into the columnar placement cavity through the opening, the contact portion can be squeezed, and the second end of the elastic arm portion can be forced to bend and deform relative to the first end towards the fixing portion to accumulate elastic force. This elastic force enables the contact portion to be in close contact with the stylus to ensure conductive stability. At the same time, the extending direction of the elastic arm portion from the first end to the second end is substantially the same as the direction of inserting the stylus into the columnar placement cavity, which can ensure the smoothness of inserting the stylus into the columnar placement cavity.

[0009] Optionally, the two ends of the fixing portion along the axis of the columnar placement cavity are respectively a third end and a fourth end, and the third end is located between the fourth end and the opening; the first end is connected to the third end. In this way, the first elastic piece undergoes a reverse bend on the extension path from the fourth end → the third end / the first end → the second end, so the size of the first elastic piece in the axial direction of the columnar placement cavity can be reduced.

[0010] Optionally, the fixing portion is sheet-shaped, and the orthographic projections of the elastic arm portion and the contact portion on the fixing portion are located within the fixing portion. In this way, the occupied area of the first elastic piece is small, which is convenient for installation in the pen sleeve.

[0011] Optionally, the pen sleeve is provided with an elastic piece installation groove, and the elastic piece installation groove is recessed from the inner wall surface of the columnar placement cavity towards the outer side of the pen sleeve. At least the fixing portion of the first elastic piece is accommodated in the elastic piece installation groove. In this way, at least the fixing portion of the first elastic piece sinks into the elastic piece installation groove, which is beneficial to increasing the size of the first elastic piece and enhancing the elastic force of the first elastic piece. At the same time, the size of the pen sleeve can be reduced, and the compactness of the internal structure of the pen sleeve can be improved.

[0012] Optionally, the shrapnel mounting groove has opposite first inner side and second inner side; the arrangement direction of the first inner side and the second inner side is perpendicular to the axial direction of the cylindrical accommodating cavity. The pen cap further includes a first limiting notch and a second limiting notch. The first limiting notch is recessed from the first inner side towards a direction away from the second inner side, and the second limiting notch is recessed from the second inner side towards a direction away from the first inner side. The edge of the fixing portion facing the first inner side is the first edge, and the edge of the fixing portion facing the second inner side is the second edge. The first shrapnel includes a first limiting portion and a second limiting portion. The first limiting portion extends from the first edge towards a direction away from the second edge and is received in the first limiting notch, and the second limiting portion extends from the second edge towards a direction away from the first edge and is received in the second limiting notch. In this way, by means of the cooperation between the first limiting portion and the first limiting notch, and the cooperation between the second limiting portion and the second limiting notch, the first shrapnel can be limited in the depth direction of the shrapnel mounting groove, preventing the first shrapnel from disengaging from the shrapnel mounting groove in the depth direction of the shrapnel mounting groove.

[0013] Optionally, the shrapnel mounting groove includes a first mounting groove portion and a second mounting groove portion. The inner side of the first mounting groove portion away from the opening is the third inner side, and the second mounting groove portion extends from the third inner side towards a direction away from the opening. The first inner side and the second inner side are located in the second mounting groove portion, and the width of the second mounting groove portion in the arrangement direction of the first inner side and the second inner side is smaller than the width of the first mounting groove portion in the arrangement direction of the first inner side and the second inner side; the first limiting notch and the second limiting notch extend towards the first mounting groove portion and penetrate the third inner side. In this way, the first limiting portion can be installed into the first limiting notch from the end of the first limiting notch penetrating the third inner side, and similarly, the second limiting portion can be installed into the second limiting notch from the end of the second limiting notch penetrating the third inner side, thereby simplifying the assembly operation of the first shrapnel in the shrapnel mounting groove.

[0014] Optionally, the first shrapnel further includes a first wing portion and a second wing portion. The first wing portion extends from the first edge towards the shrapnel arm portion, and the second wing portion extends from the second edge towards the shrapnel arm portion, and the first wing portion and the second wing portion are located between the first inner side and the second inner side. The cooperation between the first wing portion and the first inner side, and the cooperation between the second wing portion and the second inner side can prevent the first shrapnel from moving in the arrangement direction of the first inner side and the second inner side.

[0015] Optionally, the first wing portion and the second wing portion are located on a side of the first limiting portion and the second limiting portion away from the first mounting groove portion. With such a layout, the set length of the first limiting notch and the second limiting notch in the axial direction of the cylindrical accommodating cavity can be reduced, thereby ensuring the structural strength of the pen cap.

[0016] Optionally, the inner side of the elastic sheet mounting groove away from the opening is the fourth inner side. The pen sleeve further has a circuit board mounting groove and a socket. The circuit board mounting groove is located on the side of the elastic sheet mounting groove away from the opening. The charging assembly includes a circuit board, and the circuit board is received in the circuit board mounting groove. The socket extends from the fourth inner side towards the direction away from the opening and communicates with the circuit board mounting groove. The first elastic sheet further includes a plugging portion. The plugging portion is connected to the fixing portion, and the plugging portion is plugged into the socket. One end of the plugging portion away from the fixing portion extends into the circuit board mounting groove and is electrically connected to the circuit board. In this way, the electric quantity from the first power receiving structure can be supplied to the first elastic sheet through the circuit board, and further supplied to the stylus through the first elastic sheet. This structure is simple, and the first elastic sheet generally extends along the axial direction of the columnar accommodating cavity. Therefore, the occupied space of the first elastic sheet in the radial direction of the columnar accommodating cavity can be reduced, which is beneficial to reducing the volume of the pen sleeve.

[0017] Optionally, the first elastic sheet further includes a third limiting portion. The third limiting portion includes an opposite fifth end and sixth end. The fifth end is connected to the fixing portion, and the sixth end is connected to the plugging portion. From the fifth end to the sixth end, the third limiting portion extends along the fourth inner side. In this way, by means of the cooperation between the third limiting portion and the fourth inner side, the first elastic sheet can be limited along the axial direction of the columnar accommodating cavity, thereby firmly connecting the first elastic sheet in the elastic sheet mounting groove and preventing the first elastic sheet from loosening in position when the stylus is inserted.

[0018] Optionally, the contact portion includes a contact portion main body and a contact layer. The contact portion main body is connected to the second end. The contact layer is disposed on the surface of the contact portion main body, and the conductivity of the contact layer is greater than that of the contact portion main body. The contact layer is used to contact the stylus. In this way, by means of the contact layer, the conductivity efficiency between the contact portion and the stylus can be improved.

[0019] Optionally, the material of the contact layer includes at least one of gold, nickel, silver, and copper.

[0020] Optionally, the charging device further includes a protective shell body for protecting the display device. The pen sleeve is disposed on the outer side of the protective shell body, and a part of the charging assembly is disposed in the protective shell body. This structure is simple, and the charging device can bind the stylus and the display device into a whole to prevent the stylus from being lost.

[0021] Optionally, the protective shell body includes a main shell and a hinge protection cover. The first power receiving structure is disposed on the main shell. The hinge protection cover is rotatably connected to the main shell, and the pen sleeve is disposed on the outer side of the hinge protection sleeve. In this way, the protective shell body can be used to protect the folding screen device, and at the same time, it can avoid the protective shell body from blocking the inner screen and the outer screen of the folding screen device. Moreover, since the pen sleeve is disposed on the outer side of the hinge protection sleeve, the pen sleeve does not occupy the outer space of the main shell. When the display component is in a folded state and placed on the desktop, the outer side surface of the main shell can contact the desktop to ensure flatness.

[0022] Optionally, the axis of the columnar accommodating cavity is parallel to the rotation axis of the hinge protection cover relative to the main housing. This is beneficial for reducing the size of the structure formed by the pen sleeve and the protection shell body.

[0023] Optionally, a notch is provided on the side wall of the pen sleeve facing away from the hinge protection cover, and the notch communicates with the columnar accommodating cavity. The notch extends along the axis of the columnar accommodating cavity and communicates with the opening, and the width of the notch is smaller than the maximum cross-sectional width of the columnar accommodating cavity. In this way, after the stylus is inserted into the columnar accommodating cavity, the pen sleeve can limit the stylus to prevent the stylus from falling out through the notch. At the same time, defining the arrangement direction of the hinge protection cover and the pen sleeve as the first direction, with the help of the notch, the thickness of the pen sleeve along the first direction can be reduced, and the height of the pen sleeve protruding from the outside of the hinge protection cover can be reduced, which is beneficial for reducing the volume of the charging device.

[0024] Optionally, an elastic limiting member may be provided on the inner wall of the columnar accommodating cavity, and the material of the elastic limiting member includes but is not limited to rubber, silica gel, and foam. When the stylus is inserted into the columnar accommodating cavity, the elastic limiting member is compressed and deformed and accumulates elastic force, and this elastic force can limit the stylus to prevent the stylus from falling out of the opening.

[0025] In a second aspect, a charging system is further provided, and the charging system includes a charging device and a stylus. The charging device is the charging device described in any of the above technical solutions. The stylus is accommodated in the columnar accommodating cavity, and the stylus includes a first conductive contact member and a second conductive contact member, and the first conductive contact member is in electrical conduction contact with the first elastic sheet, and the second conductive contact member is in electrical conduction contact with the second elastic sheet.

[0026] Since the charging system provided in this application includes the charging device described in any of the above technical solutions, the two can solve the same technical problems and achieve the same effects.

[0027] Optionally, the first conductive contact member and the second conductive contact member extend along the circumferential direction of the stylus. In this way, the stylus has a circumferential misalignment margin, so that when the stylus is misaligned circumferentially relative to the pen sleeve, the first conductive contact member and the second conductive contact member can still be in stable contact and electrical conduction with the first elastic sheet and the second elastic sheet respectively.

[0028] Optionally, the central angle of the first conductive contact member and the second conductive contact member relative to the central axis of the stylus is greater than or equal to 15° and less than 180°. In this way, the size of the central angle is appropriate, which can ensure the circumferential misalignment margin of the stylus. Description of the Drawings

[0029] Figure 1 A three-dimensional view of the charging system provided in some embodiments of the present application when the display device is in the unfolded state;

[0030] Figure 2 is Figure 1 a perspective view of the exploded structure of the charging system shown;

[0031] Figure 3 is Figure 2 a perspective view of the exploded structure of the charging system shown from another perspective;

[0032] Figure 4 is Figure 1 a perspective view of the charging system shown when the display device is in a folded state;

[0033] Figure 5 is Figure 2 a schematic cross-sectional structure view of the display device in the charging system shown along the A-A direction;

[0034] Figure 6 is Figure 2 and Figure 3 a block diagram of the internal circuit of the display device in the charging system shown;

[0035] Figure 7 is Figures 1-4 a perspective view of the charging device in the charging system shown from one perspective;

[0036] Figure 8 is Figures 1-4 a perspective view of the charging device in the charging system shown from another perspective;

[0037] Figure 9 is Figure 7 and Figure 8 a schematic exploded view of the protective cover shown;

[0038] Figure 10 is Figure 2 and Figure 3 a circuit diagram of the charging system shown;

[0039] Figure 11 is Figure 2 and Figure 3 a perspective view of the stylus in the charging system shown;

[0040] Figure 12 is a perspective view of the charging device and the stylus in the charging system provided by some other embodiments of the present application;

[0041] Figure 13 is Figure 12 a schematic exploded view of the charging system shown after hiding the hinge protective cover and the pen sleeve of the charging device;

[0042] Figure 14 is Figure 13 a partial enlarged view of the charging system shown in Region I;

[0043] Figure 15 For Figure 14 The structural schematic diagram of the first elastic piece in the charging device of the charging system shown;

[0044] Figure 16 For Figure 12 The structural schematic diagram of the charging device when viewed from the second direction;

[0045] Figure 17 For Figure 15 The structural schematic diagram of the assembly of the first elastic piece in the pen sleeve;

[0046] Figure 18 For Figure 14 The structural schematic diagram of the assembly of the first elastic piece, the second elastic piece and the writing pen in the charging device of the charging system shown;

[0047] Figure 19 For Figure 18 The cross-sectional structural schematic diagram of the writing pen at the first conductive contact and the second conductive contact in the charging device shown;

[0048] Figure 20 For Figures 12-14 The circuit block diagram of the charging system shown.

[0049] Reference numerals:

[0050] 100 - Charging system;

[0051] 10 - Display device; 11 - Inner screen; 111 - First inner screen part; 112 - Second inner screen part; 113 - Third inner screen part; 12 - First housing; 121 - First middle frame; 122 - Outer screen; 13 - Second housing; 131 - Second middle frame; 132 - Back cover; 14 - Hinge mechanism; 15 - Second charging structure; TX1 - First charging coil; 151 - First magnetic isolation part; C1 - First capacitor; 101 - First charging management module; 102 - Power management module; 103 - First battery; 104 - Controller;

[0052] 20 - Charging device; 21 - Protective case body; 211 - Main case; 2111 - First rigid body; 2112 - First soft film; 212 - Hinge protection cover; 213 - Clamping flange; 214 - Avoidance opening; 215 - Magnet; O1 - First rotating shaft; 216 - Soft material; 2161 - First part of soft material; 2162 - Second part of soft material; 22 - Pen sleeve; 22a - Cylindrical accommodating cavity; 22b - Opening; 22c - Notch; 30b - Pen clip; 23 - Second soft film; 24 - Charging component; 241 - First power receiving structure; RX1 - First power receiving coil; 211a - First installation groove; 25 - First plugging member; 242 - First charging structure; TX2 - Second charging coil; 212a - Second installation groove; 26 - Second plugging member; 243 - Conversion circuit; C2 - Second capacitor; C3 - Third capacitor; 2431 - Rectification circuit; 2432 - Transformer circuit; 2433 - Inverter circuit; 211b - Third installation groove; 27 - Third plugging member;

[0053] 30 - Stylus pen; 30a - Charging port; 30b - Pen clip; 31 - Pen case; 311 - Pen barrel; 312 - Pen tip; 32 - Second power receiving structure; RX2 - Second power receiving coil; C4 - Fourth capacitor; 33 - Second charging management module; 34 - Second battery;

[0054] 242a - First elastic piece; 242a1 - Fixed part; a3 - Third end; a4 - Fourth end; 242a2 - Elastic arm part; a1 - First end; a2 - Second end; 242a3 - Contact part; 242a4 - First limiting part; 242a5 - Second limiting part; 242a6 - First wing part; 242a7 - Second wing part; 242a8 - Insertion part; 242a9 - Third limiting part; a5 - Fifth end; a6 - Sixth end;

[0055] 221 - Elastic piece installation groove; 221a - Bottom surface; 221b - First inner side surface; 221c - Second inner side surface; 222 - First limiting notch; 223 - Second limiting notch; L1 - First edge; L2 - Second edge; 2211 - First installation groove part; 221d - Third inner side surface; 2212 - Second installation groove part; 221e - Fourth inner side surface; 224 - Circuit board installation groove; 225 - Socket;

[0056] 242b - Second elastic piece;

[0057] 244 - Circuit board. Specific embodiments

[0058] In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", "fourth", "fifth", or "sixth" may explicitly or implicitly include one or more of such features.

[0059] In the embodiments of the present application, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising such element.

[0060] In the embodiments of the present application, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0061] The present application provides a charging system for charging a stylus.

[0062] Please refer to Figures 1-4 , Figure 1 which is a perspective view of the charging system 100 provided in some embodiments of the present application when the display device 10 is in an unfolded state, Figure 2 is Figure 1 a perspective view of the exploded structure of the charging system 100 shown, Figure 3 is Figure 2 a perspective view of the exploded structure of the charging system 100 shown from another perspective, Figure 4 is Figure 1 a perspective view of the charging system 100 shown when the display device 10 is in a folded state. The charging system 100 includes a display device 10, a charging device 20, and a stylus 30.

[0063] The display device 10 serves as a power source for the stylus 30.

[0064] Specifically, the display device can be a foldable screen device or a straight plate display device. Specifically, the display device can be a user equipment (UE) or a terminal device, etc. For example, the display device can be a portable android device (PAD), a laptop, a watch, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc., including mobile terminals or fixed terminals.

[0065] In this application, the display device is taken as an example of a foldable screen device for illustrative purposes. Specifically, the foldable screen device can be a handheld device with wireless communication function, such as a mobile phone.

[0066] Specifically, please refer to Figure 2 and Figure 3 , the display device 10 includes an inner screen 11, a first housing 12, a second housing 13, and a hinge mechanism 14.

[0067] The inner screen 11 is used to display information such as images and videos. The inner screen 11 can be an organic light-emitting diode (OLED) screen, a micro organic light-emitting diode screen, a quantum dot light emitting diode (QLED) screen, a liquid crystal display (LCD), and so on.

[0068] The inner screen 11 has a display surface for displaying image information, and the display surface of the inner screen 11 is exposed to present information such as images and videos to the user. The inner screen 11 includes a first inner screen portion 111, a second inner screen portion 112, and a third inner screen portion 113, and the third inner screen portion 113 is connected between the first inner screen portion 111 and the second inner screen portion 112. In Figure 4 In the display device 10 shown, the inner screen 11 is in an unfolded state, and the first inner screen portion 111, the third inner screen portion 113, and the second inner screen portion 112 are arranged in sequence along the length direction of the display device 10. In this way, the display device 10 is folded transversely. In some other embodiments, when the inner screen 11 is in an unfolded state, the first inner screen portion 111, the third inner screen portion 113, and the second inner screen portion 112 may also be arranged in sequence along the width direction of the display device 10. In this way, the display device 10 is folded longitudinally. When the inner screen 11 is in an unfolded state, large-screen display can be realized to provide users with richer information and a better user experience.

[0069] At least the third inner screen portion 113 of the inner screen 11 is a flexible screen structure. In this way, the third inner screen portion 113 can be bent and deformed under the action of an external force, so that the inner screen 11 is folded from Figure 2 and Figure 3 the unfolded state shown to Figure 4 the folded state shown. When the inner screen 11 is in a folded state, the display surface of the first inner screen portion 111 faces the display surface of the second inner screen portion 112. The first inner screen portion 111 and the second inner screen portion 112 of the inner screen 11 may be flexible screen structures, may also be rigid screen structures, or may be partially flexible screen structures and partially rigid screen structures, which are not specifically limited herein.

[0070] The first housing 12 carries the first inner screen portion 111, and the second housing 13 carries the second inner screen portion 112. The hinge mechanism 14 is connected between the first housing 12 and the second housing 13 and carries the third inner screen portion 113. The hinge mechanism 14 is used to realize the rotation between the second housing 13 and the first housing 12 to support the folding of the inner screen 11 between the unfolded state and the folded state.

[0071] In the above embodiments, optionally, please refer to Figure 3 for emphasis. The first housing 12 may include a first middle frame 121 and an outer screen 122 connected together. The first inner screen portion 111 is carried on the first middle frame 121, and the outer screen 122 is located on the side of the first middle frame 121 away from the first inner screen portion 111, and the outer screen 122 can be replaced with a back cover.

[0072] The second housing 13 may also include a second middle frame 131 and a back cover 132 that are connected together. The second inner screen portion 112 is carried on the second middle frame 131, and the back cover 132 is located on the side of the second middle frame 131 away from the second inner screen portion 112, and the back cover 132 may also be replaced with a display screen.

[0073] In some embodiments, referring to Figure 2 and Figure 3 , the display device 10 further includes a second charging structure 15 for outputting electric power to a charging device 20 and further supplying the electric power to the stylus 30 by means of the charging device 20. When the second charging structure 15 does not cover the charging device 20, the second charging structure 15 may also output electric power to electronic devices such as mobile phones, tablet computers, smart watches, and smart bracelets.

[0074] The second charging structure 15 may be disposed on the second housing 13. Specifically, referring to Figure 5 , Figure 5 For Figure 2 shown in the schematic cross-sectional structure diagram of the display device 10 along the A-A direction in the charging system 100, the second charging structure 15 may be accommodated in the accommodation space between the second middle frame 131 and the back cover 132 to ensure the appearance neatness and consistency of the display device 10.

[0075] In other embodiments, the second charging structure 15 may also be disposed on the first housing 12 or the hinge mechanism 14. The following embodiments are described by way of example with the second charging structure 15 disposed on the second housing 13.

[0076] In some embodiments, please continue to refer to Figure 5 , the second charging structure 15 may include a first charging coil TX1. Specifically, the first charging coil TX1 may be a planar spiral coil or a cylindrical spiral coil. In this application, the first charging coil TX1 is described by way of example as a planar spiral coil. The first charging coil TX1 may be wound by a wire or may be a metal pattern layer disposed on a circuit board. Among them, the circuit board includes but is not limited to a printed circuit board (PCB) and a flexible printed circuit (FPC) board.

[0077] In this way, the first charging coil TX1 can be hidden inside the second housing 13. In other embodiments, the first charging coil TX1 may also be disposed on the surface of the back cover 132 facing away from the second middle frame 131 or be wrapped by the material of the back cover 132.

[0078] Based on the above embodiments, please continue to refer to Figure 5, the second charging structure 15 may further include a first magnetic shielding member 151. The first magnetic shielding member 151 may be in a sheet shape. In other examples, the first magnetic shielding member 151 may also be in a plate shape or a block shape. The first magnetic shielding member 151 may be disposed on a side of the first charging coil TX1 facing away from the back cover 132.

[0079] The first magnetic shielding member 151 is used to reduce the magnetic field absorption of other metal structures in the second housing 13 on the first charging coil TX1. At the same time, the first magnetic shielding member 151 can increase the magnetic field strength on the side of the first charging coil TX1 facing the back cover 132, so that the first charging coil TX1 has the directivity of energy emission, thereby increasing the electromagnetic induction distance. The first magnetic shielding member 151 may include a magnetic material. For example, the first magnetic shielding member 151 may include ferrite. In some other embodiments, the first magnetic shielding member 151 may also include at least one of magnetic materials such as neodymium iron boron alloy (Nd-Fe-B), samarium, aluminum nickel cobalt alloy (Al-Ni-Co), iron silicon aluminum alloy (Fe-Si-Al), and permalloy (Ni-Fe).

[0080] In other embodiments, the second charging structure 15 may also be a conductive sheet, a conductive elastic sheet, or a spring pin (also known as a pogo pin). The following embodiments are further described based on the second charging structure 15 including the first charging coil TX1 and the first magnetic shielding member 151, which should not be considered as a special limitation to this application.

[0081] In some embodiments, the second charging structure 15 is also used to cooperate with a charging device to receive power from the charging device. The charging device includes but is not limited to a charging stand or electronic devices such as mobile phones, tablet computers, smart watches, and smart bracelets.

[0082] To achieve the above object, please refer to Figure 6 , Figure 6 For Figure 2 and Figure 3 the internal circuit block diagram of the display device 10 in the charging system 100 shown. The display device 10 may further include a first capacitor C1, a first charging management module 101, a power management module 102, a first battery 103, and a controller 104.

[0083] The first capacitor C1 and the first charging coil TX1 are connected in series to form a first LC circuit.

[0084] The first charging management module 101 is connected between the first LC circuit and the first battery 103 to store the power received by the first charging coil TX1 in the first battery 103.

[0085] The power management module 102 is connected between the first LC circuit and the first battery 103. The power management module 102 is also connected to the controller 104. The power management module 102 is configured to supply the power of the first battery 103 to the first LC circuit after the controller 104 receives a preset instruction, so as to realize power output by means of the first charging coil TX1. Among them, the preset instruction can be triggered by a mechanical button, a virtual button, a fingerprint recognition module or a menu option displayed on the screen of the display device 10, and the present application does not make specific limitations on this.

[0086] On the basis above, please refer back to Figures 1-4 , the charging device 20 is configured to supply the power of the display device 10 to the stylus 30. In some embodiments, the charging device 20 can be a protective case of the display device 10. The protective case is used to protect the display device 10, and at the same time, the protective case is also used to store the stylus 30, so as to bind the stylus 30 to the display device 10, prevent the stylus 30 from being lost, and improve the convenience of using and carrying the stylus 30.

[0087] In some embodiments, please refer to Figure 7 and Figure 8 , Figure 7 is Figures 1-4 a perspective view of the charging device 20 in the charging system 100 shown in one perspective, Figure 8 is Figures 1-4 a perspective view of the charging device 20 in the charging system 100 shown in another perspective. The charging device 20 includes a protective case body 21 and a pen sleeve 22.

[0088] The protective case body 21 covers and protects the outside of the display device 10 to play a protective role of anti-falling and anti-scratching. Based on this, for the convenience of description, unless otherwise specified, in the following embodiments, the "outer side" used to describe the protective case body 21 and each part in the protective case body 21 refers to the side of the described object facing away from the display device 10, the "outer surface" refers to the surface of the described object facing away from the display device 10, the "inner side" refers to the side of the described object facing the display device 10, and the "inner surface" refers to the surface of the described object facing the display device 10. The corresponding descriptions in the following text should be understood in the same way and will not be repeated one by one.

[0089] Specifically, the protective case body 21 can cover the display side of the inner screen 11, the side of the first housing 12 facing away from the first inner screen part 111, the side of the second housing 13 facing away from the second inner screen part 112, or the side of the hinge mechanism 14 facing away from the third inner screen part 113. Among them, the display side of the inner screen 11 refers to the side facing the display surface of the inner screen 11.

[0090] Exemplarily, please refer back to Figure 1 and Figure 3, the protective shell body 21 can cover one side of the second shell 13 facing away from the second inner screen part 112 and one side of the hinge mechanism 14 facing away from the third inner screen part 113, and does not cover the display side of the inner screen 11 and one side of the first shell 12 facing away from the first inner screen part 111. In this way, it is possible to prevent the protective shell body 21 from blocking the inner screen 11 and the outer screen 122.

[0091] Based on this, optionally, please continue to refer to Figure 7 and Figure 8 and in combination with referring to Figure 2 and Figure 3 , the protective shell body 21 can include a main shell 211 and a hinge protection cover 212.

[0092] The main shell 211 can cover one side of the second shell 13 facing away from the second inner screen part 112 to protect the second shell 13.

[0093] In some embodiments, please refer to Figure 7 and Figure 8 , a clamping flange 213 can be provided at the edge of the main shell 211. The clamping flange 213 is used to clamp the second shell 13 to fix the positions of the main shell 211 and the second shell 13. In other embodiments, a magnetic attracting member can also be provided on the main shell 211 to magnetically attract and fix the second shell 13 by means of the magnetic attracting member.

[0094] An avoidance opening 214 is further provided on the main shell 211. The avoidance opening 214 is used to avoid the camera decoration of the display device 10, and the shape and size of the avoidance opening 214 can be adapted to the shape and size of the camera decoration.

[0095] Please refer to Figure 7 , the hinge protection cover 212 is rotatably connected to the main shell 211. Based on this, the rotation axis of the hinge protection cover 212 and the main shell 211 is defined as the first rotation axis O1. In combination with referring to Figure 2 and Figure 3 , the hinge protection cover 212 can cover one side of the hinge mechanism 14 facing away from the third inner screen part 113 to protect the hinge mechanism 14.

[0096] In some embodiments, please refer to Figure 7 , a magnet 215 can be provided inside the hinge protection cover 212. The hinge protection cover 212 can be magnetically attracted and fixed to the hinge mechanism 14 by means of the magnet 215. This structure is simple and can ensure the clean consistency of the appearance.

[0097] In the above embodiments, the magnet 215 can be a permanent magnet, and the materials of the permanent magnet include but are not limited to neodymium iron boron magnets, ferrite magnets, and cobalt magnets. Of course, in other embodiments, the magnet 215 can also be an electromagnet.

[0098] The number of magnets 215 can be one or more. In some embodiments, refer to Figure 7 , the number of magnets 215 is two, and the two magnets 215 are arranged at intervals along a direction parallel to the first rotation axis O1. In this way, the number of magnets 215 is moderate, which can take into account both cost and magnetic adsorption stability.

[0099] In other embodiments, the hinge protection cover 212 can also be fixedly connected to the hinge mechanism 14 by means of threaded connectors or snap connectors, and the present application does not make specific limitations thereon.

[0100] The hinge protection cover 212 and the main housing 211 can be rotatably connected by a hinge or can be rotatably connected by a soft material.

[0101] In some embodiments, refer to Figure 7 , a soft material 216 is connected between the hinge protection cover 212 and the main housing 211. The soft material 216 includes but is not limited to nylon and leather. Among them, leather includes but is not limited to genuine leather, recycled leather, artificial leather or synthetic leather. The materials of artificial leather and synthetic leather can be polyurethane (PU) or polyvinyl chloride (PVC). The hinge protection cover 212 and the main housing 211 are rotatably connected by means of the soft material 216. In this way, the structure of the protection shell body 21 is simple and the cost is low.

[0102] Refer to Figure 9 , Figure 9 is Figure 7 and Figure 8 the exploded structural schematic diagram of the charging device 20 shown in. The soft material 216 includes a first part of the soft material 2161 and a second part of the soft material 2162. The first part of the soft material 2161 is connected between the outer surface of the main housing 211 and the outer surface of the hinge protection cover 212, and the second part of the soft material 2162 is connected between the inner surface of the main housing 211 and the inner surface of the hinge protection cover 212. And the part of the first part of the soft material 2161 located between the main housing 211 and the hinge protection cover 212 is the first part, and the part of the second part of the soft material 2162 located between the main housing 211 and the hinge protection cover 212 is the second part, and the first part and the second part are bonded.

[0103] In this way, the connection stability of the soft material 216 with the main housing 211 and the hinge protection cover 212 is relatively good, and the electrical connection lines between the main housing 211 and the hinge protection cover 212 can be blocked and protected by means of the first part of the soft material 2161 and the second part of the soft material 2162.

[0104] In some embodiments, refer to Figure 9, the main housing 211 may include a first rigid body 2111 and a first soft film 2112.

[0105] The material of the first rigid body 2111 may be a non-metallic material such as polycarbonate (PC), PC + glass fiber, or acrylonitrile butadiene styrene plastic (ABS plastic).

[0106] The first rigid body 2111 serves as the "structural framework" of the main housing 211, which is used to maintain the structural form of the main housing 211 and support other structural components on the main housing 211. Based on this, the above-mentioned snap flange 213 may be fixed to the first rigid body 2111. Specifically, the snap flange 213 may be integrally formed with the first rigid body 2111 or fixed to the first rigid body 2111 by gluing. This application does not make specific limitations on this.

[0107] The material of the first soft film 2112 includes but is not limited to nylon, leather, and the like. The first soft film 2112 is laminated on the outer side of the first rigid body 2111. Specifically, the first soft film 2112 may be fixedly glued to the first rigid body 2111. The first soft film 2112 forms the appearance surface of the main housing 211, which is used to ensure the touch and texture of the main housing 211.

[0108] In some embodiments, please continue to refer to Figure 9 , the first soft film 2112 may be made of the same material as the above-mentioned first part of the soft material 2161 and is an integral structural member. In this way, the complexity of the composition structure of the protective shell body 21 can be reduced, and the assembly efficiency can be improved.

[0109] On the above basis, the pen sleeve 22 is arranged on the outer side of the protective shell body 21. In some embodiments, please refer to Figures 7-9 , the pen sleeve 22 may be arranged on the outer side of the hinge protection cover 212. In this way, the pen sleeve 22 does not occupy the outer space of the main housing 211. When the charging system 100 is in a folded state and placed on the desktop, the outer side surface of the main housing 211 can contact the desktop to ensure flatness.

[0110] In some embodiments, please refer with emphasis to Figure 8, a columnar accommodating cavity 22a is provided inside the pen sleeve 22, and the columnar accommodating cavity 22a is used to accommodate the stylus 30. The axial direction of the columnar accommodating cavity 22a is parallel to the rotation axis of the hinge protection cover 212 relative to the main housing 211, and the axial direction of the columnar accommodating cavity 22a is consistent with the length direction of the stylus 30 accommodated therein. One end of the columnar accommodating cavity 22a in the axial direction is open to form an opening 22b, and the stylus 30 can be inserted into the columnar accommodating cavity 22a through the opening 22b, or withdrawn from the columnar accommodating cavity 22a through the opening 22b. This structure is simple and occupies a small volume, which is beneficial to the miniaturization of the volume of the charging device 20.

[0111] In some embodiments, an elastic limiting member (not shown in the figure) may be provided on the inner wall of the columnar accommodating cavity 22a, and the material of the elastic limiting member includes but is not limited to rubber, silica gel, and foam. When the stylus 30 is inserted into the columnar accommodating cavity 22a, the elastic limiting member is compressed and deformed and stores elastic force, and this elastic force can limit the stylus 30 to prevent the stylus 30 from falling out through the opening 22b.

[0112] Among them, the elastic limiting member may be a ring structure, and this ring structure is arranged along the circumferential direction of the columnar accommodating cavity 22a. In this way, the elastic force distribution of each part along the circumference of the stylus 30 is uniform, and the stylus 30 can be held at the central part of the columnar accommodating cavity 22a.

[0113] In some embodiments, please continue to refer to Figure 8 , a notch 22c is provided on the side wall of the pen sleeve 22 facing away from the hinge protection cover 212, and the notch 22c communicates with the columnar accommodating cavity 22a. The notch 22c extends along the axial direction of the columnar accommodating cavity 22a and communicates with the opening 22b, and the width W of the notch 22c is smaller than the maximum cross-sectional width of the columnar accommodating cavity 22a. In this way, after the stylus 30 is inserted into the columnar accommodating cavity 22a, the pen sleeve 22 can limit the stylus 30 to prevent the stylus 30 from falling through the notch 22c. At the same time, define the arrangement direction of the hinge protection cover 212 and the pen sleeve 22 as the first direction D1. By means of the notch 22c, the thickness of the pen sleeve 22 along the first direction D1 can be reduced, and the height of the pen sleeve 22 protruding from the outside of the hinge protection cover 212 can be reduced, which is beneficial to reducing the volume of the charging system 100.

[0114] On the basis of the above embodiments, please refer to Figure 8 , and in combination with referring to Figure 2 and Figure 3 , the stylus 30 is provided with a pen clip 30b. When the stylus 30 is inserted into the columnar accommodating cavity 22a, the pen clip 30b can be accommodated in the notch 22c. In this way, the position of the stylus 30 along its own circumference can be limited, which is convenient for charging and positioning the stylus 30. At the same time, the user's finger can pull the pen clip 30b through the notch 22c, and the stylus 30 can be withdrawn from the columnar accommodating cavity 22a, and this operation is convenient.

[0115] In some embodiments, referring to Figure 2 and Figure 3 , the stylus 30 is provided with a charging port 30a. In this way, the stylus 30 can be taken out of the pen sleeve 22 and charged by means of a charging cable.

[0116] In some embodiments, referring to Figure 9 , the charging device 20 may further include a second soft film 23. The second soft film 23 covers the pen sleeve 22 and the hinge protection cover 212 to enhance the appearance texture and touch feeling of the pen sleeve 22 and the hinge protection cover 212.

[0117] In some embodiments, continue to refer to Figure 9 , the second soft film 23, the first soft film 2112 and the first part of the soft material 2161 are made of the same material and are an integral structural member. In this way, the complexity of the composition structure of the protective shell body 21 can be reduced, and the assembly efficiency can be improved.

[0118] Based on any of the above embodiments, please pay attention to Figure 9 , in addition to including the protective shell body 21 and the pen sleeve 22, the charging device 20 further includes a charging component 24.

[0119] The charging component 24 includes a first power receiving structure 241 and a first charging structure 242.

[0120] The first power receiving structure 241 is disposed on the protective shell body 21, and the power receiving end of the first power receiving structure 241 faces the inner side of the protective shell body 21 to receive the power from the display device 10. Wherein, the power receiving end of the first power receiving structure 241 is also the end of the first power receiving structure 241 for receiving power.

[0121] In this way, the first power receiving structure 241 can cooperate with the second charging structure 15 of the display device 10 to receive the power from the display device 10.

[0122] In some embodiments, referring to Figure 7 , the first power receiving structure 241 can be disposed on the main housing 211, which has a reasonable layout and is convenient for charging in cooperation with the display device 10. Of course, in other embodiments, the first power receiving structure 241 can also be disposed on the hinge protection cover 212.

[0123] In some embodiments, the first power receiving structure 241 may include a first power receiving coil RX1. Specifically, the first power receiving coil RX1 may be a planar spiral coil or a cylindrical spiral coil. The present application is exemplified by taking the first power receiving coil RX1 as a planar spiral coil. The coil may be wound by a wire or may be a metal pattern layer disposed on a circuit board. The circuit board includes but is not limited to a PCB and an FPC board. In this way, the first power receiving coil RX1 may be hidden inside the main housing 211 to ensure the neat appearance of the main housing 211.

[0124] When the charging device 20 covers the outside of the display apparatus 10 , the plane where the first receiving coil RX1 is located is substantially parallel to the plane where the first charging coil TX1 is located, and the area surrounded by the first receiving coil RX1 is at least partially opposite to the area surrounded by the first charging coil TX1 .

[0125] In this way, when the alternating current I1 is passed through the first charging coil TX1, an alternating magnetic field is generated around the first charging coil TX1, and the magnetic induction lines of the magnetic field at least partially pass through the area surrounded by the first receiving coil RX1. Based on this, according to the principle of electromagnetic induction, an alternating current I2 can be induced in the first receiving coil RX1, thereby realizing wireless transmission of electric energy. This charging method does not require a charging cable connection, so it is convenient to use and safe and reliable.

[0126] On the basis of the above embodiment, the first power receiving structure 241 may further include a second magnetic shielding member (not shown in the figure), which may be in the form of a sheet, or in other examples, in the form of a plate or block. The second magnetic shielding member may be disposed on the side of the first power receiving coil RX1 that is opposite to the first charging coil TX1.

[0127] The second magnetic shielding member is used to reduce the magnetic field absorption of the first power receiving coil RX1 by other metal structures outside the charging device 20. At the same time, the second magnetic shielding member can increase the magnetic field strength received by the first power receiving coil RX1, so that the first power receiving coil RX1 has the directionality of energy reception, thereby increasing the electromagnetic induction distance.

[0128] Of course, in other embodiments, the first power receiving structure 241 may also be a conductive sheet, a conductive spring sheet or a pogo pin. The following embodiments are further described based on the first power receiving structure 241 including the first power receiving coil RX1 and the second magnetic shielding member, which cannot be considered as a special limitation of the present application.

[0129] In some embodiments, see Figure 9, the main housing 211 is provided with a first installation groove 211a. The first installation groove 211a is recessed from the inner surface to the outer surface of the main housing 211. Optionally, the first installation groove 211a can be annular, and the first power receiving structure 241 is accommodated in the first installation groove 211a. On this basis, the charging device 20 can further include a first plugging member 25, which is also accommodated in the first installation groove 211a and is located between the first power receiving structure 241 and the inner surface of the main housing 211. In this way, the first plugging member 25 can cover and protect the first power receiving structure 241, and at the same time, the first plugging member 25 does not protrude from the inner surface of the main housing 211, avoiding affecting the tightness of the fit between the display device 10 and the main housing 211.

[0130] Among them, the material of the first plugging member 25 can be selected as elastic soft materials such as silica gel and rubber. In this way, the first plugging member 25 can produce elastic deformation to match the first installation groove 211a. Moreover, the first plugging member 25 can be adhesively fixed to the main housing 211 or can be snap-fixed to the main housing 211. The present application does not make specific limitations on this.

[0131] On the above basis, please continue to refer to Figure 9 , the first charging structure 242 is provided on the pen sleeve 22, and the charging end of the first charging structure 242 faces the inner side of the pen sleeve 22. The charging end of the first charging structure 242 is also the end of the first charging structure 242 that emits electric energy; the inner side of the pen sleeve 22 refers to the side of the pen sleeve 22 facing the columnar accommodation cavity 22a.

[0132] The first charging structure 242 can include a second charging coil TX2. Specifically, the second charging coil TX2 can be a planar spiral coil or a cylindrical spiral coil. In this application, the second charging coil TX2 is taken as an example of a planar spiral coil for illustrative purposes. The coil can be wound by a wire or can be a metal pattern layer provided on a circuit board. Among them, the circuit board includes but is not limited to a PCB and an FPC board. This structure is simple and easy to implement.

[0133] On the basis of the above embodiments, the first charging structure 242 can further include a third magnetic isolation member (not shown in the figure). The third magnetic isolation member is provided on the side of the second charging coil TX2 facing away from the columnar accommodation cavity 22a, so that the second charging coil TX2 has the directivity of energy emission, thereby increasing the electromagnetic induction distance.

[0134] Similarly, in other embodiments, the first charging structure 242 can also be a conductive sheet, a conductive elastic sheet or a pogopin. The following embodiments are further described on the basis that the first charging structure 242 includes the second charging coil TX2 and the third magnetic isolation member, which should not be considered as a special limitation to this application.

[0135] In some embodiments, please continue to refer to Figure 9 In Figure 9 , the hinge protection cover 212 is provided with a second installation groove 212a, and the second installation groove 212a is recessed from the inner surface of the hinge protection cover 212 towards the pen sleeve 22. Optionally, the second installation groove 212a is rectangular, and the first charging structure 242 is accommodated in the second installation groove 212a. On this basis, the charging device 20 may further include a second plugging member 26, and the second plugging member 26 is also accommodated in the second installation groove 212a and is located between the first charging structure 242 and the inner surface of the hinge protection cover 212. In this way, the second plugging member 26 can cover and protect the first charging structure 242, and at the same time, the second plugging member 26 does not protrude from the inner surface of the hinge protection cover 212, avoiding affecting the tightness of the fit between the display device 10 and the hinge protection cover 212.

[0136] Among them, the material of the second plugging member 26 can be selected as elastic soft materials such as silica gel and rubber. In this way, the second plugging member 26 can produce elastic deformation to match the second installation groove 212a. Moreover, the second plugging member 26 can be adhesively fixed to the hinge protection cover 212 or can be snap-fitted to the hinge protection cover 212, and the present application does not make specific limitations on this.

[0137] The first charging structure 242 is electrically connected to the first power receiving structure 241, and the electric power received by the first power receiving structure 241 from the display device 10 can be further supplied to the stylus 30 through the first charging structure 242 to charge the stylus 30.

[0138] In this way, the stylus 30 can be charged in the pen sleeve 22 without being taken out of the pen sleeve 22. Therefore, the charging convenience is relatively high, and the risk of loss of the stylus 30 is relatively low. Moreover, in an outdoor scenario without a charging device, the stylus 30 can be charged by means of the display device 10, so that the charging system 100 can still meet the office needs in an outdoor scenario.

[0139] In the above embodiment, when the magnitude and form of the electric power received by the first power receiving structure 241 meet the charging power magnitude and form requirements of the first charging structure 242 for the stylus 30, the first charging structure 242 can be directly electrically connected to the first power receiving structure 241. When the magnitude and form of the electric power received by the first power receiving structure 241 do not meet the charging power magnitude and form requirements of the first charging structure 242 for the stylus 30, the first charging structure 242 can be electrically connected to the first power receiving structure 241 by means of a conversion circuit.

[0140] For example, please refer to Figure 10 Figure 10 For Figure 2 and Figure 3The circuit diagram of the charging system 100 shown. Inside the charging device 20, a conversion circuit 243 is connected between the second charging coil TX2 and the first power receiving coil TX1. The conversion circuit 243 may include a second capacitor C2, a third capacitor C3, a rectification circuit 2431, a voltage conversion circuit 2432, and an inversion circuit 2433.

[0141] The second capacitor C2 and the first power receiving coil RX1 are connected in series to form a second LC circuit. The third capacitor C3 and the second charging coil TX2 are connected in series to form a third LC circuit.

[0142] The rectification circuit 2431 is electrically connected to the second LC circuit and is used to convert the alternating current signal received by the first power receiving coil RX1 into a direct current signal. The voltage conversion circuit 2432 is electrically connected to the rectification circuit 2431 and is used to adjust the voltage of the direct current signal formed after rectification by the rectification circuit 2431 to be adapted to the stylus 30. Among them, the voltage conversion circuit 2432 may include at least one of a boost circuit and a buck circuit. The inversion circuit 2433 is electrically connected between the voltage conversion circuit 2432 and the third LC circuit and is used to convert the direct current signal with the adjusted voltage by the voltage conversion circuit 2432 into an alternating current signal and output it to the second charging coil TX2 so as to transmit to the stylus 30 by means of the second charging coil TX2.

[0143] In this way, by means of the conversion circuit 243, the amount and form of the electric quantity received by the first power receiving structure 241 can be converted to meet the requirements of the amount and form of the charging electric quantity of the first charging structure 242 for the stylus 30. The structure of this conversion circuit 243 is simple and the volume is small, which is convenient for installation in the charging device 20.

[0144] In some embodiments, the conversion circuit 243 may be disposed in the main housing 211. Specifically, please refer back to Figure 9 , the main housing 211 may be provided with a third installation groove 211b, and the third installation groove 211b is recessed from the inner surface to the outer surface of the main housing 211. Optionally, the third installation groove 211b may be rectangular, and the conversion circuit 243 is accommodated in the third installation groove 211b. On this basis, the charging device 20 may further include a third plugging member 27, and the third plugging member 27 is also accommodated in the third installation groove 211b and is located between the conversion circuit 243 and the inner surface of the main housing 211. In this way, the third plugging member 27 can cover and protect the conversion circuit 243, and at the same time, the third plugging member 27 does not protrude from the inner surface of the main housing 211, avoiding affecting the tightness of the fit between the display device 10 and the main housing 211.

[0145] Among them, the material of the third plugging member 27 can be selected as elastic soft materials such as silica gel and rubber. In this way, the third plugging member 27 can undergo elastic deformation to match the third installation groove 211b. Moreover, the third plugging member 27 can be adhesively fixed to the main housing 211 or can be snap-fixed to the main housing 211, and the present application does not make specific limitations thereon.

[0146] In some embodiments, the third plugging member 27 and the first plugging member 25 can be an integral structural member. In this way, the number of components of the charging device 20 can be reduced, and the assembly difficulty can be lowered.

[0147] Based on the above embodiments, please refer to Figure 10 and Figure 11 , Figure 11 which is Figure 2 and Figure 3 a perspective view of the stylus 30 in the charging system 100 shown. The stylus 30 can include a pen shell 31 and a second power receiving structure 32, a fourth capacitor C4, a second charging management module 33, and a second battery 34 accommodated in the pen shell 31.

[0148] Among them, the pen shell 31 can include a pen barrel 311 and a pen tip 312, and the pen barrel 311 and the pen tip 312 can be connected by means such as plugging, snapping, and threading.

[0149] The second power receiving structure 32 is used to cooperate with the first charging structure 242 to receive power from the charging device 20.

[0150] The second power receiving structure 32 can include a second power receiving coil RX2. Specifically, the second power receiving coil RX2 can be a planar spiral coil or a cylindrical spiral coil. In the present application, the second power receiving coil RX2 is taken as a planar spiral coil for illustrative purposes. The coil can be wound by a wire or can be a metal pattern layer provided on a circuit board.

[0151] In this way, the second power receiving coil RX2 can be hidden in the pen shell 31, which can ensure the appearance neatness of the stylus 30.

[0152] Based on the above embodiments, the second power receiving structure 32 can further include a fourth magnetic isolation member (not shown in the figure). The fourth magnetic isolation member is disposed on the side of the second power receiving coil RX2 facing away from the second charging coil TX2, so that the second power receiving coil RX2 has energy receiving directivity and improves the charging efficiency.

[0153] Based on the above, the cooperation mode of the second power receiving coil RX2 and the second charging coil TX2 can be the same as that of the first power receiving coil RX1 and the first charging coil TX1, and will not be elaborated here.

[0154] In other embodiments, the second power receiving structure 32 can also be a conductive sheet, a conductive elastic sheet, or a pogo pin. This embodiment exemplarily illustrates the second power receiving structure 32 including a second power receiving coil RX2 and a fourth magnetic isolation member.

[0155] The fourth capacitor C4 is connected in series with the second power receiving structure 32 to form a fourth LC circuit.

[0156] The second charging management module 33 is connected between the fourth LC circuit and the second battery 34 to store the power received by the second power receiving structure 32 in the second battery 34.

[0157] The above embodiments introduce a two-stage wireless charging component composed of the display device 10, the charging device 20, and the stylus 30, which can meet the charging requirements of the stylus 30. In this wireless charging component, the charging coil is hidden inside the device, which can ensure the appearance neatness. Of course, in other embodiments, between the display device 10 and the charging device 20, and / or between the charging device 20 and the stylus 30, a conductive contact member and a conductive elastic sheet can also be used to contact, or a conductive contact member and a pogo pin can be used to contact to achieve power transmission. Compared with the wireless charging method, the contact charging method has less power loss and higher charging efficiency.

[0158] For example, please refer to Figures 12-14 , Figure 12 which is a three-dimensional view of the charging device 20 and the stylus 30 in the charging system 100 provided by some other embodiments of the present application. Figure 13 It is Figure 12 a schematic exploded view of the charging system 100 shown after hiding the hinge protection cover 212 and the pen sleeve 22 of the charging device 20. Figure 14 It is Figure 13 a partial enlarged view of the charging system 100 shown in area I. In the charging system 100 described in this embodiment, the charging device 20 is different from Figures 7-8 the charging device 20 shown as follows: In this embodiment, the first charging structure 242 includes elastic sheets, and the elastic sheets are arranged inside the pen sleeve 22. When the stylus 30 is inserted into the pen sleeve 22, the first charging structure 242 contacts the stylus 30 by means of the elastic sheets to supply power to the stylus 30. In this way, the charging device 20 supplies power to the stylus 30 in a contact manner, which can improve the charging efficiency of the charging device 20 to the stylus 30.

[0159] Specifically, please focus on referring to Figure 14 , the elastic sheets can include a first elastic sheet 242a and a second elastic sheet 242b, and the first elastic sheet 242a and the second elastic sheet 242b are respectively used as a positive charging terminal and a negative charging terminal to supply power to the stylus 30.

[0160] In some embodiments, the first elastic piece 242a can be used as the positive charging terminal, and the second elastic piece 242b is used as the negative charging terminal. In other embodiments, the first elastic piece 242a can also be used as the negative charging terminal, and the second elastic piece 242b is used as the positive charging terminal.

[0161] The structure of the first elastic piece 242a will be mainly introduced below. The structure of the second elastic piece 242b can be the same as that of the first elastic piece 242a, and this embodiment will not elaborate on this.

[0162] Please refer to Figures 15-17 , Figure 15 For Figure 14 the schematic structural diagram of the first elastic piece 242a in the charging device 20 in the charging system 100 shown in Figure 16 For Figure 12 the schematic structural diagram of the charging device 20 as viewed from the second direction D2 shown in Figure 17 For Figure 15 the schematic assembly structure diagram of the first elastic piece 242a in the pen sleeve 22 shown in

[0163] The fixing portion 242a1 is fixed to the pen sleeve 22. Please pay special attention to refer to Figure 15 and Figure 16 , the elastic arm portion 242a2 may include an opposite first end a1 and a second end a2. The first end a1 is connected to the fixing portion 242a1, and the contact portion 242a3 is connected to the second end a2. From the first end a1 to the second end a2, the elastic arm portion 242a2 extends in a direction away from the opening 22b and inclines towards the center line O2 of the cylindrical accommodating cavity 22a. Among them, the center line O2 of the cylindrical accommodating cavity 22a refers to the straight line formed by connecting the centers of the cross-sections at each axial position of the cylindrical accommodating cavity 22a.

[0164] The contact portion 242a3 is used to contact the stylus 30 to transmit electric power.

[0165] In this way, during the process of the stylus 30 being inserted into the cylindrical accommodating cavity 22a from the opening 22b, the contact portion 242a3 can be squeezed, and the second end a2 of the elastic arm portion 242a2 is forced to bend relative to the first end a1 towards the fixing portion 242a1 to accumulate elastic force. This elastic force enables the contact portion 242a3 to be in close contact with the stylus 30 to ensure conductive stability. At the same time, the extending direction of the elastic arm portion 242a2 from the first end a1 to the second end a2 is substantially the same as the direction in which the stylus 30 is inserted into the cylindrical accommodating cavity 22a, which can ensure the smoothness of the stylus 30 being inserted into the cylindrical accommodating cavity 22a.

[0166] In some embodiments, please refer to Figure 15, the fixing part 242a1 includes opposite third end a3 and fourth end a4. When the first elastic piece 242a is received and fixed in the elastic piece mounting groove 221, please refer to Figure 16 , the third end a3 and the fourth end a4 are arranged along the axial direction of the columnar accommodating cavity 22a (represented as the X direction in the figure), and the third end a3 is located between the fourth end a4 and the opening 22b. That is to say, the distance from the third end a3 to the opening 22b is less than the distance from the fourth end a4 to the opening 22b.

[0167] Based on this, the first end a1 of the elastic arm part 242a2 can be connected to the third end a3 of the fixing part 242a1. In this way, the first elastic piece 242a makes a reverse bend on the extension path of the fourth end a4 → the third end a3 / the first end a1 → the second end a2, so that the size of the first elastic piece 242a in the axial direction of the columnar accommodating cavity 22a can be reduced.

[0168] On the basis of the above embodiment, optionally, please refer to Figure 15 , the fixing part 242a1 is in a sheet shape, and the orthographic projections of the elastic arm part 242a2 and the contact part 242a3 on the fixing part 242a1 are located within the fixing part 242a1. Among them, the orthographic projections of the elastic arm part 242a2 and the contact part 242a3 on the fixing part 242a1 refer to the projection areas of the elastic arm part 242a2 and the contact part 242a3 on the plane along the direction perpendicular to the plane on the basis of ignoring the thickness of the fixing part 242a1 and equivalenting the fixing part 242a1 to a plane.

[0169] In this way, the occupied area of the first elastic piece 242a is small, which is convenient for installation in the pen sleeve 22.

[0170] The contact part 242a3 can be in a convex spherical shape, a convex spherical shell shape, a columnar shape, a block shape, etc., and the present application does not make specific limitations on this. In some embodiments, please refer to Figure 15 , the contact part 242a3 can be a bent structure, and this bent structure bends from the second end a2 of the elastic arm part 242a2 to the fixing part 242a1. This structure is simple, and the surface of the contact part 242a3 facing the stylus 30 is smooth, which can reduce friction and wear.

[0171] Optionally, the contact part 242a3 can include a contact part main body and a contact layer. The contact part main body is connected to the second end a2. The contact layer is arranged on the surface of the contact part main body, and the conductivity of the contact layer is greater than that of the contact part main body. The contact layer is used to contact the stylus 30. In this way, with the help of the contact layer, the conductivity efficiency between the contact part 242a3 and the stylus 30 can be improved.

[0172] In some embodiments, the material of the contact layer can include at least one of gold, nickel, silver and copper. The conductivity efficiency of these materials is relatively high, which is beneficial to improving the conductivity efficiency.

[0173] In some embodiments, referring to Figure 16 and Figure 17 , the pen cap 22 is provided with a shrapnel mounting groove 221, and the shrapnel mounting groove 221 is recessed from the inner wall surface of the cylindrical accommodating cavity 22a towards the outer side of the pen cap 22. Among them, please refer to Figure 12 in combination. The outer side of the pen cap 22 refers to the side of the pen cap 22 facing away from the cylindrical accommodating cavity 22a. The outer side of the pen cap 22 includes the side of the pen cap 22 facing the hinge protection cover 212, the side of the pen cap 22 facing away from the hinge protection cover 212, and the other two opposite sides located between the side of the pen cap 22 facing the hinge protection cover 212 and the side of the pen cap 22 facing away from the hinge protection cover 212.

[0174] On the above basis, at least the fixing portion 242a1 of the first shrapnel 242a is accommodated in the shrapnel mounting groove 221.

[0175] In this way, at least the fixing portion 242a1 of the first shrapnel 242a sinks into the shrapnel mounting groove 221, which is beneficial to increasing the size of the first shrapnel 242a and enhancing the elastic force of the first shrapnel 242a. At the same time, the size of the pen cap 22 can be reduced, and the compactness of the internal structure of the pen cap 22 can be improved.

[0176] Optionally, please refer to Figure 17 with emphasis. The shrapnel mounting groove 221 includes a bottom surface 221a. The fixing portion 242a1 is accommodated in the shrapnel mounting groove 221 and fixed on the bottom surface 221a. Specifically, the fixing portion 242a1 can be fixed on the bottom surface 221a by means such as gluing or snap connection.

[0177] Of course, in other embodiments, the fixing portion 242a1 can also be directly fixed on the inner wall surface of the cylindrical accommodating cavity 22a, or fixed on a convex block that protrudes from the inner wall surface of the cylindrical accommodating cavity 22a towards the inside of the cylindrical accommodating cavity 22a.

[0178] In some embodiments, please continue to refer to Figure 17 , the shrapnel mounting groove 221 has a first inner side surface 221b and a second inner side surface 221c that face each other.

[0179] The arrangement direction of the first inner side surface 221b and the second inner side surface 221c is perpendicular to the axial direction (X direction) of the cylindrical accommodating cavity 22a. Among them, the arrangement direction of the first inner side surface 221b and the second inner side surface 221c refers to the direction perpendicular to the first inner side surface 221b and the second inner side surface 221c, which is represented as the Y direction in the figure. In some embodiments, please refer to Figure 17 , the bottom surface 221a is connected between the first inner side surface 221b and the second inner side surface 221c.

[0180] On the basis described above, please continue to refer to Figure 17 , the pen cap 22 further includes a first limiting notch 222 and a second limiting notch 223. The first limiting notch 222 is recessed from the first inner side surface 221b in a direction away from the second inner side surface 221c, and the second limiting notch 223 is recessed from the second inner side surface 221c in a direction away from the first inner side surface 221b.

[0181] Please refer to Figure 15 , the fixing portion 242a1 includes opposite first and second edges L1 and L2. When the first elastic piece 242a is received and fixed in the elastic piece mounting groove 221, the first edge L1 faces the first inner side surface 221b, and the second edge L2 faces the second inner side surface 221c.

[0182] The first elastic piece 242a further includes a first limiting portion 242a4 and a second limiting portion 242a5. The first limiting portion 242a4 extends from the first edge L1 in a direction away from the second edge L2, and the second limiting portion 242a5 extends from the second edge L2 in a direction away from the first edge L1. When the first elastic piece 242a is received and fixed in the elastic piece mounting groove 221, please refer to Figure 17 , the first limiting portion 242a4 is received in the first limiting notch 222, and the second limiting portion 242a5 is received in the second limiting notch 223.

[0183] In this way, by means of the cooperation between the first limiting portion 242a4 and the first limiting notch 222, and the cooperation between the second limiting portion 242a5 and the second limiting notch 223, the first elastic piece 242a can be limited in the depth direction (represented as the Z direction in the figure) of the elastic piece mounting groove 221, preventing the first elastic piece 242a from disengaging from the elastic piece mounting groove 221 along the Z direction.

[0184] On the basis of the above embodiments, in order to facilitate the assembly of the first elastic piece 242a in the elastic piece mounting groove 221, in some embodiments, please continue to refer to Figure 17 , the elastic piece mounting groove 221 may include a first mounting groove portion 2211 and a second mounting groove portion 2212.

[0185] The inner side surface of the first mounting groove portion 2211 away from the opening 22b is the third inner side surface 221d, and the second mounting groove portion 2212 extends from the third inner side surface 221d in a direction away from the opening 22b.

[0186] The first inner side surface 221b and the second inner side surface 221c are located in the second installation groove portion 2212, and the width of the second installation groove portion 2212 in the arrangement direction (Y direction) of the first inner side surface 221b and the second inner side surface 221c is smaller than the width of the first installation groove portion 2211 in the arrangement direction (Y direction) of the first inner side surface 221b and the second inner side surface 221c. The first limiting notch 222 and the second limiting notch 223 extend towards the first installation groove portion 2211 and penetrate through the third inner side surface 221d.

[0187] In this way, the first limiting portion 242a4 can be installed into the first limiting notch 222 through the open end at one end of the first limiting notch 222 that penetrates the third inner side surface 221d. Similarly, the second limiting portion 242a5 can be installed into the second limiting notch 223 through the open end at one end of the second limiting notch 223 that penetrates the third inner side surface 221d. Thus, the assembly operation of the first elastic piece 242a in the elastic piece installation groove 221 can be simplified.

[0188] In some embodiments, please continue to refer to Figure 15 , the first elastic piece 242a further includes a first wing portion 242a6 and a second wing portion 242a7. The first wing portion 242a6 extends from the first edge L1 towards the elastic arm portion 242a2, and the second wing portion 242a7 extends from the second edge L2 towards the elastic arm portion 242a2.

[0189] When the first elastic piece 242a is accommodated and fixed in the elastic piece installation groove 221, please refer to Figure 17 , the first wing portion 242a6 and the second wing portion 242a7 are located between the first inner side surface 221b and the second inner side surface 221c. The first wing portion 242a6 cooperates with the first inner side surface 221b, and the second wing portion 242a7 cooperates with the second inner side surface 221c, which can prevent the first elastic piece 242a from moving in the arrangement direction (Y direction) of the first inner side surface 221b and the second inner side surface 221c.

[0190] In some embodiments, please refer to Figure 17 , when the first elastic piece 242a is accommodated and fixed in the elastic piece installation groove 221, the first wing portion 242a6 and the second wing portion 242a7 are located on the side of the first limiting portion 242a4 and the second limiting portion 242a5 away from the first installation groove portion 2211. With such a layout, the set length of the first limiting notch 222 and the second limiting notch 223 in the axial direction (X direction) of the columnar accommodation cavity 22a can be reduced, thereby ensuring the structural strength of the pen sleeve 22.

[0191] In some embodiments, please continue to refer to Figure 17 , the inner side surface of the elastic piece installation groove 221 away from the opening 22b is the fourth inner side surface 221e.

[0192] The pen cap 22 is further provided with a circuit board mounting groove 224 and a socket 225. The circuit board mounting groove 224 is located on a side of the elastic piece mounting groove 221 away from the opening 22b. Based on this, the charging assembly 24 includes a circuit board 244, and the circuit board 244 includes but is not limited to a PCB and an FPC board. In this application, the circuit board 244 is an FPC board for exemplary illustration.

[0193] The circuit board 244 is received in the circuit board mounting groove 224. The socket 225 extends from the fourth inner side surface 221e in a direction away from the opening 22b and communicates with the circuit board mounting groove 224.

[0194] On the basis of the above, please also refer to Figure 15 and Figure 17 , the first elastic piece 242a further includes a plugging portion 242a8, the plugging portion 242a8 is connected to the fixing portion 242a1, the plugging portion 242a8 is plugged in the socket 225, and one end of the plugging portion 242a8 away from the fixing portion 242a1 extends into the circuit board mounting groove 224 and is electrically connected to the circuit board 244. Specifically, the plugging portion 242a8 and the circuit board 244 can be welded or in contact electrical connection, and this application does not make specific limitations on this.

[0195] In this way, the electric quantity from the first power receiving structure 241 can be supplied to the first elastic piece 242a through the circuit board 244, and further supplied to the stylus 30 through the first elastic piece 242a. This structure is simple, and the first elastic piece 242a generally extends along the axial direction of the columnar accommodating cavity 22a. Therefore, the occupied space of the first elastic piece 242a in the radial direction of the columnar accommodating cavity 22a can be reduced, which is beneficial to reducing the volume of the pen cap 22.

[0196] In some embodiments, please also refer to Figure 15 and Figure 17 , the first elastic piece 242a further includes a third limiting portion 242a9. The third limiting portion 242a9 includes opposite fifth ends a5 and sixth ends a6. The fifth end a5 is connected to the fixing portion 242a1, and the sixth end a6 is connected to the plugging portion 242a8. When the first elastic piece 242a is received and fixed in the elastic piece mounting groove 221, the third limiting portion 242a9 extends along the fourth inner side surface 221e from the fifth end a5 to the sixth end a6.

[0197] In this way, by means of the cooperation between the third limiting portion 242a9 and the fourth inner side surface 221e, the first elastic piece 242a can be limited along the axial direction (X direction) of the columnar accommodating cavity 22a, thereby firmly connecting the first elastic piece 242a in the elastic piece mounting groove 221 and preventing the first elastic piece 242a from loosening in position when the stylus 30 is inserted.

[0198] On the basis of any of the above embodiments, please refer toFigure 18 , Figure 18 is Figure 14 a schematic assembly structure diagram of a first elastic piece 242a, a second elastic piece 242b and a stylus 30 in a charging device 20 in the charging system 100 shown in the figure. The stylus 30 may include a first conductive contact 30c and a second conductive contact 30d. The first conductive contact 30c is in contact and electrical conduction with the first elastic piece 242a, and the second conductive contact 30d is in contact and electrical conduction with the second elastic piece 242b.

[0199] The materials of the first conductive contact 30c and the second conductive contact 30d include but are not limited to copper or copper alloy.

[0200] In some embodiments, please continue to refer to Figure 18 , the first conductive contact 30c and the second conductive contact 30d may be disposed at an end of the pen barrel 311 facing the pen tip 312. In other embodiments, the first conductive contact 30c and the second conductive contact 30d may also be disposed at an end of the pen tip 312 facing the pen barrel 311, and may also be independent of the pen barrel 311 and the pen tip 312 and disposed between the pen barrel 311 and the pen tip 312.

[0201] In this way, the first conductive contact 30c and the second conductive contact 30d do not affect the structural integrity of the pen tip 312 and the pen barrel 311, and the stylus 30 has better appearance performance.

[0202] Based on the above embodiments, please refer to Figure 19 , Figure 19 is Figure 18 a schematic cross-sectional structure diagram of the stylus 30 at the first conductive contact 30c and the second conductive contact 30d in the charging device 20 shown in the figure. The central axis of the stylus 30 is the central axis O3. The first conductive contact 30c and the second conductive contact 30d may extend along the circumferential direction of the stylus 30, and the circumferential direction of the pen barrel 311 refers to the direction around the central axis O3.

[0203] In this way, the stylus 30 has a circumferential misalignment margin, so that when the stylus 30 is misaligned circumferentially relative to the pen sleeve 22, the first conductive contact 30c and the second conductive contact 30d can still stably contact and conduct electricity with the first elastic piece 242a and the second elastic piece 242b respectively.

[0204] Based on this, optionally, please refer to Figure 19, the central angles θ1 and θ2 of the first conductive contact 30c and the second conductive contact 30d with respect to the central axis O3 can be greater than or equal to 15° and less than 180°. Specifically, the central angles θ1 and θ2 can be 15°, 30°, 60°, 90°, 135° or 175°. In this way, the sizes of the central angles θ1 and θ2 are appropriate, which can ensure the circumferential misalignment margin of the stylus 30.

[0205] Please refer to Figure 20 , Figure 20 is Figures 12-14 the circuit block diagram of the charging system 100 shown in the figure.

[0206] In this embodiment, the conversion circuit 243 may include a second capacitor C2, a rectification circuit 2431 and a voltage conversion circuit 2432.

[0207] The capacitor C2 is connected in series with the first power receiving structure 241 to form a second LC circuit.

[0208] The rectification circuit 2431 is electrically connected to the second LC circuit for converting the alternating current signal received by the first power receiving structure 241 into a direct current signal. The voltage conversion circuit 2432 is electrically connected to the rectification circuit 2431 for adjusting the voltage of the direct current signal formed after rectification by the rectification circuit 2431 to be adapted to the stylus 30. Among them, the voltage conversion circuit 2432 may include at least one of a boost circuit and a buck circuit. The first elastic piece 242a and the second elastic piece 242b are both electrically connected to the voltage conversion circuit 2432 to supply the direct current signal after voltage conversion by the voltage conversion circuit 2432 to the stylus 30.

[0209] In this way, with the help of the conversion circuit 243, the amount and form of the power received by the first power receiving structure 241 can be converted. At the same time, the charging system 100 charges the stylus 30 by means of first-stage wireless charging, which can improve the charging efficiency of the charging device 20 to the stylus 30.

[0210] The above describes the embodiment in which the charging device 20 is the protective case of the display device. In other embodiments, the charging device 20 may also be other structures, or a dedicated charging device for the stylus 30, and the present application does not make specific limitations thereon. At the same time, the above describes the embodiment in which the charging device 20 supplies the power of the display device to the stylus 30. In this embodiment, the power source of the stylus 30 is the display device 10. In other embodiments, a charging port may also be provided on the charging device 20 to use a charging cable as the power source of the stylus 30, and the present application does not make specific limitations thereon.

[0211] In the description of this specification, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A charging device for a stylus, characterized in that, Comprising: A pen cap, inside which there is a columnar accommodation cavity for accommodating a stylus. A charging component, which includes a first elastic sheet and a second elastic sheet, and the first elastic sheet and the second elastic sheet are arranged inside the pen cap; the charging component charges the stylus in the columnar accommodation cavity by means of the first elastic sheet and the second elastic sheet.

2. The charging device according to claim 1, wherein One end of the columnar accommodation cavity in the axial direction is open to form an opening. The first elastic sheet includes a fixing part, an elastic arm part and a contact part. The fixing part is fixed to the pen cap, the elastic arm part includes a first end and a second end which are opposite, the first end is connected to the fixing part, and the contact part is connected to the second end. From the first end to the second end, the elastic arm part extends in a direction away from the opening and inclines towards the center line of the columnar accommodation cavity.

3. The charging device according to claim 2, wherein The two ends of the fixing part in the axial direction of the columnar accommodation cavity are respectively a third end and a fourth end, and the third end is located between the fourth end and the opening; the first end is connected to the third end.

4. The charging device according to claim 3, wherein The fixing part is sheet-shaped, and the orthographic projections of the elastic arm part and the contact part on the fixing part are located inside the fixing part.

5. The charging device according to any one of claims 2-4, characterized in that, The pen cap is provided with an elastic sheet installation groove, which is recessed from the inner wall surface of the columnar accommodation cavity towards the outside of the pen cap. At least the fixing part of the first elastic sheet is accommodated in the elastic sheet installation groove.

6. The charging device according to claim 5, characterized in that, The elastic sheet installation groove has a first inner side face and a second inner side face facing each other; the arrangement direction of the first inner side face and the second inner side face is perpendicular to the axial direction of the columnar accommodation cavity. The pen cap further includes a first limiting notch and a second limiting notch; the first limiting notch is recessed from the first inner side face in a direction away from the second inner side face, and the second limiting notch is recessed from the second inner side face in a direction away from the first inner side face. The edge of the fixing part facing the first inner side face is the first edge, and the edge of the fixing part facing the second inner side face is the second edge; the first elastic sheet includes a first limiting part and a second limiting part, the first limiting part extends from the first edge in a direction away from the second edge and is accommodated in the first limiting notch, and the second limiting part extends from the second edge in a direction away from the first edge and is accommodated in the second limiting notch.

7. The charging device according to claim 6, wherein The elastic sheet installation groove includes a first installation groove part and a second installation groove part. The inner side face of the first installation groove part away from the opening is the third inner side face, and the second installation groove part extends from the third inner side face in a direction away from the opening. The first inner side face and the second inner side face are located in the second installation groove part, and the width of the second installation groove part in the arrangement direction of the first inner side face and the second inner side face is smaller than the width of the first installation groove part in the arrangement direction of the first inner side face and the second inner side face; the first limiting notch and the second limiting notch extend towards the first installation groove part and penetrate through the third inner side face.

8. The charging device according to claim 7, characterized in that, The first elastic sheet further includes a first wing part and a second wing part. The first wing portion extends from the first edge towards the elastic arm portion, and the second wing portion extends from the second edge towards the elastic arm portion. The first wing portion and the second wing portion are located between the first inner side surface and the second inner side surface.

9. The charging device according to claim 8, wherein, The first wing portion and the second wing portion are located on one side of the first limiting portion and the second limiting portion away from the portion of the first mounting groove.

10. The charging device according to any one of claims 5-9, characterized in that, The inner side surface of the elastic sheet mounting groove away from the opening is the fourth inner side surface; The pen sleeve is further provided with a circuit board mounting groove and a socket. The circuit board mounting groove is located on the side of the elastic sheet mounting groove away from the opening; the charging assembly includes a circuit board, and the circuit board is accommodated in the circuit board mounting groove; the socket extends from the fourth inner side surface in a direction away from the opening and communicates with the circuit board mounting groove; The first elastic sheet further includes a plugging portion, the plugging portion is connected to the fixing portion, and the plugging portion is plugged into the socket. One end of the plugging portion away from the fixing portion extends into the circuit board mounting groove and is electrically connected to the circuit board.

11. The charging device according to claim 10, characterized in that, The first elastic sheet further includes a third limiting portion; The third limiting portion includes an opposite fifth end and sixth end. The fifth end is connected to the fixing portion, and the sixth end is connected to the plugging portion; from the fifth end to the sixth end, the third limiting portion extends along the fourth inner side surface.

12. The charging device according to any one of claims 2-11, characterized in that, The contact portion includes a contact portion main body and a contact layer; The contact portion main body is connected to the second end; the contact layer is provided on the surface of the contact portion main body, and the conductivity of the contact layer is greater than that of the contact portion main body; the contact layer is used for contacting the stylus.

13. The charging device according to claim 12, wherein The material of the contact layer includes at least one of gold, nickel, silver, and copper.

14. The charging device according to any one of claims 2-13, characterized in that, Further included: A protective shell body for protecting a display device. The pen sleeve is disposed on the outer side of the protective shell body, and a part of the charging assembly is disposed on the protective shell body.

15. The charging device according to claim 14, wherein The protective shell body includes a main shell and a hinge protection cover; the first power receiving structure is disposed on the main shell; The hinge protection cover is rotatably connected to the main shell, and the pen sleeve is disposed on the outer side of the hinge protection sleeve.

16. The charging device according to claim 15, wherein The axial direction of the columnar accommodating cavity is parallel to the rotation axis of the hinge protection cover relative to the main shell.

17. The charging device according to claim 16, wherein A notch is provided on the side wall of the pen sleeve facing away from the hinge protection cover, and the notch communicates with the columnar accommodating cavity; The notch extends along the axial direction of the columnar accommodating cavity and communicates with the opening. The width of the notch is smaller than the maximum cross-sectional width of the columnar accommodating cavity.

18. A charging system, characterized in that, Including: The charging device according to any one of claims 1-17; A stylus, which is accommodated in the columnar accommodating cavity. The stylus includes a first conductive contact member and a second conductive contact member. The first conductive contact member is in electrical conduction contact with the first elastic sheet, and the second conductive contact member is in electrical conduction contact with the second elastic sheet.

19. The charging system according to claim 18, wherein The first conductive contact member and the second conductive contact member extend along the circumferential direction of the stylus.

20. The charging system according to claim 19, wherein The central angle of the first conductive contact and the second conductive contact with respect to the central axis of the stylus is greater than or equal to 15° and less than 180°.

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