Patent Description:
This application relates to the field related to accessories of electronic devices, and in particular, to a support apparatus.

With rapid development of Internet technologies, various electronic products have become an indispensable part of daily work and life. Touch electronic devices have been applied to work and study by more and more people with the advantages of display and handwriting.

A touch electronic device is generally provided with a stylus. To prevent the stylus from being lost, the stylus is often bound to the electronic device. For example, accessories such as support apparatuses and support frames commonly used in electronic devices are provided with structures such as clamping grooves and stylus cases to fasten styluses. However, during use of these structures, the styluses are clamped too tightly, easy to fall off, or inconvenient to place and take, which affects user experience.

<CIT> discloses that a first charging coil and a second charging coil are respectively disposed in a stylus. At least one of the first charging coil and the second charging coil is a circle coil, and the circle coil is disposed around circumference of an accommodating portion of the stylus. The stylus can be charged when the stylus is blindly inserted into the accommodating portion, to resolve a problem that a user cannot quickly charge the stylus because the charging coils need to be aligned for a plurality of times when the stylus is charged.

The present invention is defined by the features disclosed in the independent claims. Additional embodiments are defined in the dependent claims. This application provides a support apparatus and an electronic device, so as to resolve the problems that a stylus is clamped too tightly, easy to fall off and inconvenient to place and take by providing a magnetic stylus fastener and a magnet of the stylus to generate a magnetic acting force.

According to a first aspect, a support apparatus is provided in accordance with claim <NUM>. The support apparatus may be configured to fasten a stylus, the stylus includes a penholder and a magnet, the penholder includes an internal accommodating space, and the magnet is mounted in the accommodating space. The magnet includes a first wall surface and a second wall surface facing away from the first wall surface, and a polarity of the first wall surface is opposite to that of the second wall surface. Specifically, the first wall surface is an N pole, and the second wall surface is an S pole; or the first wall surface is an S pole, and the second wall surface is an N pole.

The support apparatus includes a main body, a support frame, a connecting part, and a stylus fastener, the support frame is connected to the main body by using the connecting part, and the support frame may be folded or unfolded with respect to the main body. The support frame is configured to support a mobile terminal. When the support frame is folded with respect to the main body, the mobile terminal can be accommodated between the support frame and the main body to protect appearance of the mobile terminal; and the support frame can support the mobile terminal at an angle when being unfolded with respect to the main body.

The stylus fastener is disposed on the main body, the support frame, or the connecting part.

In this embodiment, the connecting part includes an accommodating groove for accommodating the stylus, and a notch of the accommodating groove faces a side of the support apparatus in an X-axis direction, so that the stylus can be easily placed and taken. The stylus fastener is mounted in the accommodating groove without occupying an extra space of the support apparatus, so as to ensure that the support apparatus has a regular appearance contour. In an embodiment, an outer wall surface includes a first plane, and a second plane is disposed on a wall of the accommodating groove. After the stylus fastener is mounted in the accommodating groove, the first plane is attached and fastened to the second plane, so that the stylus fastener is in a surface-to-surface contact with the wall of the accommodating groove to improve stability of the stylus fastener.

In other embodiments, the main body includes a housing, and the housing includes a first mounting surface and a first appearance surface that faces away from the first mounting surface. When the support frame is folded with respect to the main body, the first mounting surface faces the support frame and is in an invisible state to protect the mobile terminal located between the main body and the support frame, and the first appearance surface faces away from the support frame and is in a visible state. The stylus fastener is disposed on the first appearance surface. When the support frame is unfolded with respect to the main body, the first mounting surface is exposed to show a keyboard disposed thereon for a user to operate. The first mounting surface also supports a bottom of the mobile terminal to prevent the mobile terminal from shaking, and the first appearance surface is in contact with an object such as a desktop for the user to use the mobile terminal.

In another embodiment, the support frame includes a second mounting surface and a second appearance surface that faces away from the second mounting surface, and when the support frame is folded with respect to the main body, the second mounting surface faces the main body and is in an invisible state to protect the mobile terminal located between the main body and the support frame. The second appearance surface faces away from the second mounting surface and is in a visible state, and the stylus fastener is disposed on the second appearance surface. When the support frame is folded with respect to the main body, the second mounting surface carries the mobile terminal, so that it is easy to use the mobile terminal.

In this embodiment, the stylus fastener includes an annular body and a mounting space formed by the body, the body is magnetic and includes an inner wall surface, an outer wall surface, and two opposite peripheral wall surfaces. The inner wall surface faces the mounting space, the outer wall surface faces away from the inner wall surface, opposite sides of the inner wall surface are connected to one side of the two peripheral wall surfaces, and opposite sides of the outer wall surface are connected to the other side of the two peripheral wall surfaces. Widths of the inner wall surface and the outer wall surface in the X-axis direction are the same, and widths of the two peripheral wall surfaces in a direction perpendicular to an X axis are the same, so that the stylus fastener can be easily machined to reduce costs. The inner wall surface has a first polarity, the outer wall surface has a second polarity, and the first polarity is opposite to the second polarity.

The stylus is mounted in the mounting space in the X-axis direction, so that the stylus fastener is sleeved onto a periphery of the stylus; and both the first wall surface and the second wall surface are disposed opposite to the inner wall surface, a first magnetic force is generated between the first wall surface and the inner wall surface, a second magnetic force is generated between the second wall surface and the inner wall surface, and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet.

The stylus is fastened by using the first magnetic force and the second magnetic force between the magnet and the stylus fastener. When the stylus tends to slide out of the mounting space of the stylus fastener, the first magnetic force and the second magnetic force lead to a significant shear force between the magnet and the stylus fastener, so that the stylus is not clamped too tightly to be taken out, and can be reliably fastened, thereby effectively preventing the stylus from falling off. To use the stylus, the user can take out the stylus by simply overcoming a magnetic force between the magnet and the stylus fastener; after use, the user inserts the stylus into the stylus fastener, and the magnet and the magnetic holder can be automatically adsorbed to fasten the stylus without additional operation. Therefore, it is very easy to place and take the stylus.

In an embodiment, the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. Specifically, a direction of magnetic lines of the body is from the inner wall surface to the outer wall surface, the first polarity is an S pole, the second polarity is an N pole, the first wall surface has a polarity of the N pole, and the second wall surface has a polarity of the S pole; or a direction of magnetic lines of the body is from the outer wall surface to the inner wall surface, the first polarity is an N pole, the second polarity is an S pole, the first wall surface has a polarity of the S pole, and the second wall surface has a polarity of the N pole. In this case, the first magnetic force between the inner wall surface and the first wall surface is a magnetic adsorption force. The magnetic adsorption force is greater than the second magnetic force, so that a resultant force of the first magnetic force and the second magnetic force is an adsorption force to ensure that the magnet and the stylus fastener attract each other. Therefore, the stylus can be reliably fastened through mutual attraction between the magnet and the stylus fastener.

In an embodiment, the second magnetic force is a magnetic repulsion force, and a direction of the first magnetic force is the same as that of the second magnetic force. Specifically, the first magnetic force between the inner wall surface and the first wall surface is a magnetic adsorption force, the second magnetic force between the inner wall surface and the second wall surface is a magnetic repulsion force, and a direction of the magnetic adsorption force is the same as that of the magnetic repulsion force, so that an acting force between the magnet and the stylus fastener can be strengthened. Therefore, the stylus can be fastened more reliably.

In an embodiment, magnetic lines of the body are evenly distributed in an extension direction of the body; and in a direction perpendicular to the X axis, a distance between the first wall surface and the inner wall surface is a first distance, a distance between the second wall surface and the inner wall surface is a second distance, and the first distance is less than the second distance. Specifically, the first distance is a linear distance between each point of the first wall surface and each point of a corresponding area of the inner wall surface, and the second distance is a linear distance between each point of the second wall surface and each point of a corresponding area of the inner wall surface. After the stylus is mounted in the mounting space of the stylus fastener, an axis of the accommodating space of the penholder in the X-axis direction coincides with an axis of the mounting space of the stylus fastener in the X-axis direction, the magnet is fastened to an inner wall of the accommodating space, and the first wall surface is closer to the inner wall of the accommodating space. In this case, the magnet deviates from the axis of the penholder in the X-axis direction, so that the first distance between the first wall surface and the inner wall surface is less than the second distance between the second wall surface and the inner wall surface. In this case, magnetic lines of the body are evenly distributed, and the first wall surface is closer to the inner wall surface to ensure that the first magnetic force is greater than the second magnetic force, so that the magnet and the stylus fastener can be reliably adsorbed, thereby improving fastening stability of the stylus.

In an embodiment, in a direction around the X axis, the inner wall surface includes a first area and a second area, and a density of magnetic lines of the first area is higher than that of the second area; and in the direction perpendicular to the X axis, the first wall surface is opposite to a part of the first area, and the second wall surface is opposite to a part of the second area. Specifically, after the stylus is mounted in the mounting space of the stylus fastener, the first distance between the first wall surface and the inner wall surface is less than the second distance between the second wall surface and the inner wall surface. In this case, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher, and a distance between the inner wall surface and the first wall surface is shorter, so that a magnetic acting force between the inner wall surface and the first wall surface is stronger. Therefore, the magnetic adsorption force can be greater than the second magnetic force to ensure that a resultant force of the first magnetic force and the second magnetic force is an adsorption force.

In an embodiment, the first wall surface is opposite to a part of the first area, the second wall surface is opposite to the entire second area, and the first distance between the first wall surface and the inner wall surface is less than the second distance between the second wall surface and the inner wall surface. Therefore, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher, and a distance between the inner wall surface and the first wall surface is shorter, so as to ensure that a magnetic adsorption force between the inner wall surface and the first wall surface is stronger.

In an embodiment, the first wall surface is opposite to the entire first area, the second wall surface is opposite to a part of the second area, and the first distance between the first wall surface and the inner wall surface is less than the second distance between the second wall surface and the inner wall surface. Therefore, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher, and a distance between the inner wall surface and the first wall surface is shorter, so as to ensure that a magnetic adsorption force between the inner wall surface and the first wall surface is stronger.

In an embodiment, in a direction perpendicular to the X axis, a density of magnetic lines of an area that is of the inner wall surface and that is opposite to the first wall surface is higher than that of an area that is of the inner wall surface and that is opposite to the second wall surface. Specifically, after the stylus is mounted in the mounting space of the stylus fastener, an axis of the accommodating space of the penholder in the X-axis direction coincides with an axis of the mounting space of the stylus fastener in the X-axis direction, and magnets are fastened in the middle of the accommodating space in the X-axis direction. In this case, the magnets are symmetrically disposed along an axis of the penholder in the X-axis direction. Therefore, in the direction perpendicular to the X axis, the first distance between the first wall surface and the inner wall surface is the same as the second distance between the second wall surface and the inner wall surface. In this case, the distance between the first wall surface and the inner wall surface is the same as the distance between the second wall surface and the inner wall surface, and a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher. Therefore, a magnetic acting force between the inner wall surface and the first wall surface is stronger to ensure that a resultant force of the first magnetic force and the second magnetic force is an adsorption force.

In an embodiment, the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. Specifically, a direction of magnetic lines of the body is from the inner wall surface to the outer wall surface, the first polarity is an S pole, the second polarity is an N pole, the first wall surface has a polarity of the S pole, and the second wall surface has a polarity of the N pole; or a direction of magnetic lines of the body is from the outer wall surface to the inner wall surface, the first polarity is an N pole, the second polarity is an S pole, the first wall surface has a polarity of the N pole, and the second wall surface has a polarity of the S pole. In this case, the second magnetic force between the inner wall surface and the second wall surface is a magnetic adsorption force. The magnetic adsorption force is greater than the first magnetic force, so that a resultant force of the first magnetic force and the second magnetic force is an adsorption force to ensure that the magnet and the stylus fastener attract each other. Therefore, the stylus can be reliably fastened through mutual attraction between the magnet and the stylus fastener.

In an embodiment, the first magnetic force is a magnetic repulsion force, and a direction of the magnetic adsorption force is the same as that of the magnetic repulsion force. Specifically, the first magnetic force between the inner wall surface and the first wall surface is a magnetic repulsion force, the second magnetic force between the inner wall surface and the second wall surface is a magnetic adsorption force, and a direction of the magnetic adsorption force is the same as that of the magnetic repulsion force, so that an acting force between the magnet and the stylus fastener can be strengthened. Therefore, the stylus can be fastened more reliably.

In an embodiment, magnetic lines of the body are evenly distributed in an extension direction of the body; and in a direction perpendicular to the X axis, a distance between the first wall surface and the inner wall surface is a first distance, a distance between the second wall surface and the inner wall surface is a second distance, and the first distance is greater than the second distance. After the stylus is mounted in the mounting space of the stylus fastener, an axis of the accommodating space of the penholder in the X-axis direction coincides with an axis of the mounting space of the stylus fastener in the X-axis direction, the magnet is fastened to an inner wall of the accommodating space, and the second wall surface is closer to the inner wall of the accommodating space. In this case, the magnet deviates from the axis of the penholder in the X-axis direction, so that the first distance between the first wall surface and the inner wall surface is greater than the second distance between the second wall surface and the inner wall surface. In this case, magnetic lines of the body are evenly distributed, and the second wall surface is closer to the inner wall surface to ensure that the magnetic adsorption force is greater than the first magnetic force, so that the magnet and the stylus fastener can be reliably adsorbed, thereby improving fastening stability of the stylus.

In an embodiment, in a direction perpendicular to the X axis and in a direction around the X axis, the inner wall surface includes a first area and a second area, and a density of magnetic lines of the first area is lower than that of the second area; and the first wall surface is opposite to a part of the first area, and the second wall surface is opposite to a part of the second area. Specifically, after the stylus is mounted in the mounting space of the stylus fastener, a distance between the first wall surface and the inner wall surface is a first distance, a distance between the second wall surface and the inner wall surface is a second distance, and the first distance is greater than or equal to the second distance. In this case, a distance between the inner wall surface and the first wall surface is greater than or equal to a distance between the inner wall surface and the second wall surface, and a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher, so that a magnetic acting force between the inner wall surface and the first wall surface is stronger. Therefore, the magnetic adsorption force can be greater than the second magnetic force to ensure that a resultant force of the first magnetic force and the second magnetic force is an adsorption force.

In an embodiment, the first wall surface is opposite to the entire first area, the second wall surface is opposite to a part of the second area, and the first distance between the first wall surface and the inner wall surface is greater than or equal to the second distance between the second wall surface and the inner wall surface. Therefore, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the second wall surface is higher, and a distance between the inner wall surface and the second wall surface is shorter, so as to ensure that a magnetic adsorption force between the inner wall surface and the second wall surface is stronger.

In an embodiment, the first wall surface is opposite to a part of the first area, the second wall surface is opposite to the entire second area, and the first distance between the first wall surface and the inner wall surface is greater than or equal to the second distance between the second wall surface and the inner wall surface. Therefore, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the second wall surface is higher, and a distance between the inner wall surface and the second wall surface is shorter, so as to ensure that a magnetic adsorption force between the inner wall surface and the second wall surface is stronger.

In an embodiment, widths of the first wall surface, the second wall surface, and the inner wall surface are the same in the X-axis direction. Specifically, because a difference in widths of the magnet and the stylus fastener in the X-axis direction affects a position where the stylus is inserted, the larger the difference in dimensions of the magnet and the stylus fastener, the position of the stylus may change each time the stylus is inserted. Therefore, if the first wall surface, the second wall surface, and the inner wall surface are disposed to have the same dimension in the X-axis direction, the magnet and the stylus fastener are aligned in the X-axis direction when the stylus is mounted in the mounting space in the X-axis direction. Then, each time the stylus is inserted into the stylus fastener after use, the position of the stylus is basically fixed to prevent a tip or a protective cap of the stylus from extending out of the support apparatus.

In an embodiment, the stylus fastener includes a plurality of magnets, and the plurality of magnets are disposed around the X axis to enclose into an annular shape. "A plurality of" means two or more. When the stylus fastener is equally divided into a plurality of magnets for machining, a bending degree of each magnet is small to reduce magnetization difficulty and costs.

In an embodiment, lengths of the plurality of magnets are the same in a direction around the X axis. Therefore, a plurality of magnets can be machined in batches to reduce machining difficulty and costs.

In an embodiment, the stylus fastener is integrally formed into an annular stylus fastener, magnetic induction lines of the integrally formed stylus fastener are evenly distributed, and a stress on the stylus is relatively uniform and stable, so that fastening stability of the stylus can be improved.

In an embodiment, a quantity of the stylus fasteners is more than one, the plurality of stylus fasteners are equally spaced in the X-axis direction, and mounting spaces of the plurality of stylus fasteners are coaxially disposed. Specifically, a plurality of magnets are disposed in the accommodating space of the penholder. Therefore, correspondingly, a plurality of stylus fasteners are disposed, the plurality of stylus fasteners are equally spaced in the X-axis direction, and mounting spaces of the plurality of stylus fasteners are coaxially disposed, where "a plurality of" means two or more. When the stylus is mounted, the stylus sequentially runs through the plurality of stylus fasteners. In this case, the plurality of magnets are in a one-to-one correspondence with the plurality of stylus fasteners, and a magnetic acting force is generated between each set of magnets and stylus fasteners, so that fastening reliability of the stylus can be improved. The plurality of stylus fasteners are equally spaced, so that a stress on the stylus is relatively uniform, and stability is higher.

In an embodiment, a plurality of magnets are disposed in the accommodating space of the penholder, and the plurality of magnets are randomly arranged in the X-axis direction of the accommodating space. Therefore, correspondingly, a plurality of stylus fasteners are randomly arranged in the X-axis direction. Specifically, a spacing between magnets located in the middle of the accommodating groove in the X-axis direction is less than a spacing between magnets located at ends. Because the stylus is long, the magnets in the middle of the accommodating groove are densely distributed, so that fastening strength in the middle of the stylus may be improved, and the entire stylus can be reliably fastened.

In an embodiment, a quantity of the stylus fasteners is one, the one stylus fastener is fastened in the middle of the accommodating groove, and the middle of the accommodating groove means any position between two ends of the accommodating groove, so as to reduce costs, reduce a weight of the support apparatus, and reduce a burden of a user to carry the electronic device provided with the support apparatus. In other embodiments, the stylus fastener is fastened at either end of the accommodating groove.

In an embodiment, the stylus fastener has a circular annular shape, a square annular shape, an elliptical annular shape, or a triangular annular shape, which may be matched with a circular stylus, a square stylus, an elliptical stylus, or a triangular stylus, respectively, so as to improve applicability matching of the stylus fastener.

In an embodiment, the stylus fastener is a closed annular stylus fastener, so that when the stylus is inserted into the stylus fastener at any angle, the first wall surface and the second wall surface of the magnet may be opposite to the inner wall surface, and the first magnetic force between the first wall surface and the inner wall surface is relatively stable, which can improve convenience of fastening the stylus.

In an embodiment, the stylus fastener is annular with an opening, so that a weight of the stylus fastener may be reduced, thereby reducing a weight of the entire support apparatus, and reducing a burden of a user to carry the electronic device provided with the support apparatus.

The support apparatus according to an embodiment of this application includes a stylus fastener, the stylus fastener and a magnet in the stylus generate a first magnetic force and a second magnetic force, and a resultant force of the first magnetic force and the second magnetic force can reliably fasten the stylus, which can not only prevent the stylus from being clamped too tightly, but also prevent the stylus from falling off. To use the stylus, the stylus can be taken out by overcoming a magnetic acting force between the magnet and the stylus fastener; and after use, the user inserts the stylus into the stylus fastener, and the magnet and the stylus fastener are automatically adsorbed to fasten the stylus. Therefore, it is easy to place and take the stylus.

In another embodiment, the stylus includes a penholder, the penholder is provided with an accommodating space, magnets are mounted in the accommodating space and are located in the middle of the accommodating space, the magnets are symmetrically disposed along an axis, and the first wall surface and the second wall surface are located on two sides of the axis. In this case, a density of magnetic lines of an area that is of the inner wall surface and that is corresponding to the first wall surface is higher than that of an area that is of the inner wall surface and that is corresponding to the second wall surface, so that a magnetic adsorption force is greater than a magnetic repulsion force to ensure that the stylus can be well fastened.

The stylus of the electronic device according to this embodiment of this application is fastened by using the magnetic acting force between the magnet and the stylus fastener. The stylus is not clamped too tightly, and fastening reliability is high, so that the stylus will not easily fall off from the electronic device. To use the stylus, the stylus can be taken out by overcoming a magnetic acting force between the magnet and the stylus fastener; and after use, the user inserts the stylus into the stylus fastener, and the magnet and the stylus fastener are automatically adsorbed to fasten the stylus. Therefore, it is easy to place and take the stylus.

To describe technical solutions in embodiments or the background of this application more clearly, the following describes accompanying drawings required in embodiments or the background of this application.

Embodiments of this application are described below with reference to accompanying drawings in embodiments of this application.

Referring to <FIG> and <FIG>, <FIG> is a schematic diagram of a structure of an electronic device <NUM> according to an embodiment of this application in a state; and <FIG> is a schematic diagram of a structure of a support apparatus of the electronic device <NUM> shown in <FIG>. The electronic device <NUM> shown in <FIG> is in an unfolded and active state.

For ease of description, a length direction of the electronic device <NUM> is defined as an X-axis direction, a width direction of the electronic device <NUM> is defined as a Y-axis direction, and a thickness direction of the electronic device <NUM> is defined as a Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

Surface magnetism: a magnetic induction intensity at a point on a surface of a stylus fastener.

The electronic device <NUM> includes a mobile terminal <NUM>, a support apparatus <NUM>, and a stylus <NUM>, and the mobile terminal <NUM> is detachably mounted on the support apparatus <NUM>. The mobile terminal <NUM> may be an electronic product with a touch panel, such as a mobile phone, a tablet computer, a personal digital assistant (personal digital assistant, PDA), an interactive electronic whiteboard, and a learning machine. In this embodiment of this application, that the mobile terminal <NUM> is a tablet computer and the support apparatus <NUM> is a tablet computer protection bracket is used as an example for description, and the tablet computer in this embodiment is equipped with a stylus <NUM>. The stylus <NUM> may be an inductive stylus or a capacitance stylus. The mobile terminal <NUM> has a display surface <NUM>, and the display surface <NUM> is used to display information such as pictures and text, and is operated by touch with the stylus <NUM>. When the electronic device <NUM> is in an unfolded state, the display surface <NUM> is exposed with respect to the support apparatus <NUM>, so that a user can easily operate and view information displayed on the display surface <NUM>.

Still referring to <FIG>, the support apparatus <NUM> includes a main body <NUM>, a support frame <NUM>, a connecting part <NUM>, and a stylus fastener <NUM>. A length direction, a width direction, and a thickness direction of the support apparatus <NUM> are the same as those of the electronic device <NUM>, respectively. Specifically, the length direction of the support apparatus <NUM> is an X-axis direction shown in the figure, the width direction of the support apparatus <NUM> is a Y-axis direction shown in the figure, and the thickness direction of the support apparatus <NUM> is a Z-axis direction shown in the figure. The support frame <NUM> is connected to the main body <NUM> by using the connecting part <NUM>, and may be folded or unfolded with respect to the main body <NUM>. The support frame <NUM> is configured to accommodate and/or support the mobile terminal <NUM>. When the support frame <NUM> is folded with respect to the main body <NUM>, the mobile terminal <NUM> may be accommodated between the main body <NUM> and the support frame <NUM> to protect appearance of the mobile terminal <NUM>. The support frame <NUM> can support the mobile terminal <NUM> at an angle when being bent and unfolded with respect to the main body <NUM>. The stylus fastener <NUM> is configured to carry and fasten the stylus <NUM>; and the stylus fastener <NUM> is disposed on the main body <NUM>, the support frame <NUM>, or the connecting part <NUM>.

In this embodiment, the main body <NUM> includes a housing <NUM>, an electronic component, and a keyboard <NUM>. The electronic component is mounted inside the housing. The electronic component may be a circuit board or a processor. The keyboard <NUM> is mounted on the housing, and the keyboard <NUM> is exposed with respect to the housing <NUM> for a user to operate the keyboard. Specifically, the keyboard is electrically connected to the electronic component, the user may operate the keyboard <NUM> to generate an operation signal, and the electronic component may process the operation signal. For example, the keyboard <NUM> and the tablet computer are electrically connected by using the electronic component for signal transmission. The tablet computer and the electronic component are connected in a wireless or wired manner for communication.

In this embodiment, the housing <NUM> includes a first mounting surface <NUM> and a first appearance surface <NUM>. When the support frame <NUM> is folded with respect to the main body <NUM>, the first mounting surface <NUM> is attached to the support frame <NUM>, and the first mounting surface <NUM> is configured to carry the electronic component and the keyboard <NUM>. The first appearance surface <NUM> is exposed and is in a visible state. When the support frame <NUM> is unfolded with respect to the main body <NUM>, the first mounting surface <NUM> is visible, and the keyboard carried by the first mounting surface <NUM> is exposed for the user to operate. The first appearance surface <NUM> is in contact with an object on which the electronic device <NUM> can be placed, such as a desktop, is in an invisible state, and plays a role in supporting the electronic device <NUM>.

The support frame <NUM> is configured to support the mobile terminal <NUM>. The support frame <NUM> includes a second mounting surface <NUM> and a second appearance surface <NUM>. When the support frame <NUM> is folded with respect to the main body <NUM>, the second mounting surface <NUM> is attached to the main body <NUM>, the second appearance surface <NUM> is exposed and is in a visible state, and the second mounting surface <NUM> is configured to carry the mobile terminal <NUM>. When the support frame <NUM> is unfolded with respect to the main body <NUM>, the support frame <NUM> may be folded into a support state. Specifically, the support frame <NUM> is bent in a direction towards the second appearance surface <NUM>, so that the support frame <NUM> has a vertically placed V-shaped structure. Aback of the mobile terminal <NUM> is supported by the second mounting surface <NUM>, and a bottom thereof is supported on the first mounting surface <NUM> of the housing <NUM> of the main body <NUM>, that is, the support apparatus <NUM> supports the mobile terminal <NUM> at an angle. In this case, the second appearance surface <NUM> faces away from the display surface <NUM>. In this embodiment, the support frame <NUM> is formed by wrapping a hard plate with a flexible outer surface layer, and the support frame <NUM> is bent through a gap between the hard plate when bending. The mobile terminal <NUM> is accommodated between the main body <NUM> and the support frame <NUM>, and the support apparatus <NUM> and the mobile terminal <NUM> may be fastened by using an external buckle or a binding rope. In other embodiments, a periphery or four corners of the second mounting surface <NUM> are provided with a wrapping to wrap a periphery of the mobile terminal <NUM>, so as to fasten the mobile terminal <NUM> and protect the periphery of the mobile terminal <NUM>.

The connecting part <NUM> of this embodiment is made of a flexible material, and is connected between the main body <NUM> and the support frame <NUM>. It may be understood that the connecting part <NUM> is a rotating structure between the main body <NUM> and the support frame <NUM> to implement free rotation of the support frame <NUM> with respect to the main body <NUM>. The connecting part <NUM> includes an accommodating groove <NUM> for accommodating the stylus <NUM> and the stylus fastener, and a notch <NUM> of the accommodating groove <NUM> faces a side of the support apparatus <NUM> in the X-axis direction, so that the stylus <NUM> can be easily placed and taken. In other embodiments, the connecting part <NUM> is a rotating shaft structure to implement connection and relative rotation between the main body <NUM> and the support frame <NUM>. The stylus fastener may be disposed on the support frame <NUM> or the main body <NUM>.

The stylus fastener <NUM> is mounted in the accommodating groove <NUM> of the connecting part <NUM> without occupying an extra space of the support apparatus <NUM>, so as to ensure that the support apparatus <NUM> has a regular appearance contour. In other embodiments, the stylus fastener <NUM> is disposed on a side of the main body <NUM> or on the first appearance surface <NUM>, or is disposed on a side of the support frame <NUM> or on the second appearance surface <NUM> for easy placement and taking.

<FIG> is a schematic diagram of a structure of a stylus <NUM> of an electronic device <NUM> according to an embodiment of this application. The stylus <NUM> includes a penholder <NUM>, a stylus tip <NUM>, a protective cap <NUM>, and a magnet <NUM>. The stylus tip <NUM> and the protective cap <NUM> are respectively located at two ends of the penholder <NUM>, and the protective cap <NUM> is detachably and fixedly connected to the penholder <NUM>.

In this embodiment, the penholder <NUM> includes an internal accommodating space <NUM>, the accommodating space <NUM> is provided with an opening at an end of the penholder <NUM>, and the protective cap <NUM> is covered on the opening to seal the accommodating space <NUM>. The accommodating space <NUM> is configured to mount components of the stylus <NUM>, such as a battery, a circuit board, a communication module, and a magnet <NUM>. When the protective cap <NUM> is removed from the penholder <NUM>, a battery can be replaced, circuit maintenance can be performed, and the like. The battery supplies power to the stylus <NUM>, and the battery may be a small battery. The communication module facilitates communication between the stylus <NUM> and the electronic device <NUM>, and the communication module may be a short distance communication network such as a Wi-Fi module, a Bluetooth module, and a near field communication (near field communication, NFC) module. The communication module is disposed on the circuit board, and the battery is electrically connected to the circuit board. Generally, the penholder <NUM> may be cylindrical, elliptic cylindrical, cuboid-shaped, triangular prism-shaped, and hexagonal prism-shaped, and correspondingly, a cross-sectional shape of the penholder <NUM> is circular, elliptical, rectangular, square, triangular, and hexagonal, which is not limited herein in this application.

<FIG> is a schematic diagram of a structure of a magnet <NUM> of the stylus <NUM> shown in <FIG>. The magnet <NUM> has a rectangular plate structure with a specific thickness, and the thickness may be set based on a size of the accommodating space <NUM> of the penholder <NUM>. The magnet <NUM> includes a first wall surface <NUM> and a second wall surface <NUM> that are oppositely disposed in a Z-axis direction. A polarity of the first wall surface <NUM> is opposite to that of the second wall surface <NUM>. Specifically, one of the first wall surface <NUM> and the second wall surface <NUM> is an N pole and the other is an S pole. In other embodiments, the first wall surface <NUM> and the second wall surface <NUM> are oppositely disposed in the Y-axis direction. In this embodiment, "first" and "second" in the first wall surface <NUM> and the second wall surface <NUM> are used for descriptive purposes, but are not intended to limit this embodiment. In other embodiments, the first wall surface <NUM> may also be referred to as the second wall surface <NUM>, and the second wall surface <NUM> may also be referred to as the first wall surface <NUM>.

In this embodiment, the magnet <NUM> is mounted in the accommodating space <NUM> of the penholder <NUM> of the stylus <NUM>, and the magnet <NUM> is fastened to an inner wall of the accommodating space <NUM>. In this case, the magnet <NUM> deviates from an axis in the X-axis direction. In other embodiments, magnets <NUM> are mounted in the penholder of the stylus <NUM> and are located in the middle of the accommodating space <NUM> in the X-axis direction. In this case, a central axis of the magnets <NUM> in the X-axis direction coincides with an axis of the accommodating space <NUM> of the penholder <NUM> in the X-axis direction, and the magnets <NUM> are symmetrically disposed along an X-axis direction of the accommodating space <NUM>, that is, the first wall surface <NUM> and the second wall surface <NUM> may be symmetrical with the axis of the accommodating space <NUM> in the X-axis direction.

<FIG> is a structural diagram of a stylus fastener of the support apparatus <NUM> shown in <FIG>. In this embodiment, the stylus fastener <NUM> includes an annular body 240A and a mounting space <NUM> formed by the body 240A. Specifically, the body 240A is of a circular annular structure, and at least one stylus fastener <NUM> is provided and is mounted in the accommodating groove <NUM>. A center line of the annular body 240A coincides with a center line in a length direction of the accommodating groove <NUM>, so as to ensure a mounting accuracy. Therefore, the stylus <NUM> can be accurately inserted into the mounting space <NUM> of the stylus fastener <NUM> after being mounted in the accommodating groove <NUM>. Specifically, the body 240A is magnetic and includes an inner wall surface <NUM>, an outer wall surface <NUM>, and two opposite peripheral wall surfaces <NUM>. The inner wall surface <NUM> is an annular surface that surrounds and faces the mounting space <NUM>, and the outer wall surface <NUM> is disposed away from the inner wall surface <NUM>. Opposite sides of the inner wall surface <NUM> are connected to one side of the two peripheral wall surfaces <NUM>, and opposite sides of the outer wall surface <NUM> are connected to the other side of the two peripheral wall surfaces <NUM>. The inner wall surface <NUM> has a first polarity, the outer wall surface <NUM> has a second polarity, and the first polarity is opposite to the second polarity. The first polarity is an S pole, the second polarity is an N pole, or the second polarity is an S pole, and the first polarity is an N pole. The mounting space <NUM> is used for insertion of the stylus <NUM>, and the stylus fastener <NUM> and the stylus <NUM> are fastened through magnetic adsorption. An axial direction of the stylus fastener <NUM> is an X-axis direction shown in <FIG>. The X-axis direction, a Y-axis direction, and a Z-axis direction in <FIG> are the same as those shown in <FIG>. The body 240A in this embodiment includes two parts <NUM> and <NUM> that are connected for magnetizing the stylus fastener <NUM> during manufacturing.

In this embodiment, the stylus fastener <NUM> is a closed annular stylus fastener, so that when the stylus <NUM> is inserted into the stylus fastener <NUM> at any angle, the first wall surface <NUM> and the second wall surface <NUM> of the magnet <NUM> may be opposite to the inner wall surface <NUM>, and a magnetic acting force between the first wall surface <NUM> and the inner wall surface <NUM> is relatively stable, which can improve convenience of fastening the stylus <NUM>. In other embodiments, the stylus fastener <NUM> is annular with an opening, so that a weight of the stylus fastener <NUM> may be reduced, thereby reducing a weight of the entire support apparatus <NUM>, and reducing a burden of a user to carry the electronic device <NUM> provided with the support apparatus <NUM>.

In this embodiment, referring to <FIG> is a schematic diagram showing a state in which a stylus <NUM> is mounted in a stylus fastener <NUM>, and <FIG> is a schematic diagram showing a direction of a magnetic acting force between a magnet <NUM> and a stylus fastener <NUM>. When the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM> in the X-axis direction so that the stylus fastener <NUM> is sleeved onto a periphery of the stylus <NUM>, the first wall surface <NUM> and the second wall surface <NUM> are disposed opposite to the inner wall surface <NUM>, a first magnetic force is generated between the first wall surface <NUM> and the inner wall surface <NUM>, and the first magnetic force and the second magnetic force have a difference, so that the stylus <NUM> can be magnetically fastened to the stylus fastener by using the magnet <NUM>.

The inner wall surface <NUM> of the stylus fastener <NUM> in this application has a first polarity, the outer wall surface <NUM> has a second polarity, and the first polarity is opposite to the second polarity. It may be understood that magnetic lines of the annular stylus fastener <NUM> are radially arranged; and the first magnetic force and the second magnetic force have a difference, so that the stylus <NUM> is magnetically fastened to the stylus fastener by using the magnet <NUM>. The stylus fastener <NUM> is magnetic, and magnetic lines are radially arranged. Compared with a conventional manner of fastening a stylus <NUM> by using an iron ring and a magnet <NUM>, a magnetic acting force between the stylus fastener <NUM> and the magnet <NUM> is significantly increased. A shear force generated when the magnet <NUM> and the stylus fastener move away from each other in the X-axis direction is affected by a magnetic acting force therebetween: A stronger magnetic acting force indicates a stronger shear force, and a weaker magnetic acting force indicates a weaker shear force. Therefore, when the magnetic acting force is significantly increased, the shear force is also greatly increased. Specifically, when the stylus <NUM> tends to slide out of the mounting space <NUM> of the stylus fastener <NUM>, the magnet <NUM> and the stylus fastener tend to move away from each other in the X-axis direction. Because of a magnetic acting force therebetween, the magnet <NUM> and the stylus fastener tend to move close to each other due to the magnetic acting force, and in this case, a shear force is generated to prevent the stylus <NUM> from sliding out in the X-axis direction. Because the magnetic acting force is strong, the shear force is correspondingly strengthened, so that the stylus <NUM> is not clamped too tightly to be taken out, and can be reliably fastened, thereby effectively preventing the stylus <NUM> from falling off. Compared with a magnet <NUM> with annularly arranged magnetic lines in the conventional technology, a magnetic fastening force is strengthened. To use the stylus <NUM>, the user can take out the stylus <NUM> by simply overcoming a magnetic acting force; and after use, the user inserts the stylus <NUM> into the stylus fastener <NUM>, and the magnet <NUM> and the magnetic holder can be automatically adsorbed to fasten the stylus <NUM> without additional operation. Therefore, it is very easy to place and take the stylus.

In an embodiment, the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. In another embodiment, the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. When the first magnetic force is greater than the second magnetic force, the first magnetic force is a magnetic adsorption force, the second magnetic force is a magnetic repulsion force, and a direction of the magnetic repulsion force is the same as that of the first magnetic force, the stylus <NUM> may be pushed close to a direction of the adsorption force, so as to further improve a fastening effect of the stylus <NUM>. If the magnetic adsorption force is greater than the magnetic repulsion force, a situation in which the magnet <NUM> and the stylus fastener <NUM> repel each other due to an excessive magnetic repulsion force may be prevented, so as to avoid affecting fastening of the stylus <NUM>.

Still referring to <FIG>, in this embodiment, the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. A direction of magnetic lines of the body 240A is from the inner wall surface <NUM> to the outer wall surface <NUM>, and the magnetic lines of the body 240A are evenly distributed in the X-axis direction. The first polarity is an S pole, the second polarity is an N pole, the first wall surface <NUM> has a polarity of the N pole, and the second wall surface <NUM> has a polarity of the S pole. In this case, the inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic adsorption force F11, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic repulsion force F21. A force generated by the magnetic adsorption force F11 on the stylus <NUM> and a force generated by the magnetic repulsion force F21 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F01 between the magnet <NUM> and the stylus fastener <NUM> is equal to F1 <NUM>+F21, and the magnetic acting force F01 is radially outward along the stylus fastener <NUM>, so that a fastening force on the stylus <NUM> from the stylus fastener is strengthened, thereby further improving the fastening stability.

In another implementation of this embodiment, referring to <FIG> is a schematic diagram showing a direction of a magnetic acting force between another magnet <NUM> and a stylus fastener <NUM>. A direction of magnetic lines of the body 240A is from the outer wall surface <NUM> to the inner wall surface <NUM>, the first polarity is an N pole, the second polarity is an S pole, the first wall surface <NUM> has a polarity of the S pole, and the second wall surface <NUM> has a polarity of the N pole. In this case, the inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic adsorption force F12, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic repulsion force F22. A force generated by the magnetic adsorption force F12 on the stylus <NUM> and a force generated by the magnetic repulsion force F22 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F02 between the magnet <NUM> and the stylus fastener <NUM> is equal to F12+F22, and the magnetic acting force F02 is radially outward along the stylus fastener <NUM>, so that a fastening force on the stylus <NUM> from the stylus fastener is strengthened, thereby improving fastening stability of the stylus <NUM>.

In this embodiment, the magnet <NUM> is fastened to an inner wall of the accommodating space <NUM>, and the magnet <NUM> deviates from an axis of the penholder in the X-axis direction. After the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM>, an axis of the accommodating space <NUM> of the penholder in the X-axis direction coincides with an axis of the mounting space <NUM> of the stylus fastener <NUM> in the X-axis direction. After the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM>, in a direction perpendicular to the X axis, a distance between the first wall surface <NUM> of the magnet <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is a first distance, and a distance between the second wall surface <NUM> and the inner wall surface <NUM> is a second distance. In this embodiment, the first distance is less than the second distance. In other implementations, magnets <NUM> are fastened in the middle of the accommodating space <NUM> of the penholder in the X-axis direction, the magnets <NUM> are symmetrically disposed along an axis of the penholder in the X-axis direction, and the magnets <NUM> deviate from an axis of the mounting space <NUM> in the X-axis direction. After the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM>, an axis of the accommodating space <NUM> of the penholder in the X-axis direction deviates from an axis of the mounting space <NUM> of the stylus fastener <NUM> in the X-axis direction. In the direction perpendicular to the X axis, the first distance between the first wall surface <NUM> and the inner wall surface <NUM> is less than the second distance between the second wall surface <NUM> and the inner wall surface <NUM>. In this embodiment, magnetic lines of the body 240A are evenly distributed in the X-axis direction. A distance between the first wall surface <NUM> of the magnet <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is a first distance, a distance between the second wall surface <NUM> of the magnet <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is a second distance, and the first distance is less than the second distance, so that the magnetic adsorption force is strengthened. Therefore, the magnetic repulsion force F21 is less than the magnetic adsorption force F11. Therefore, when the stylus <NUM> tends to fall off from the stylus fastener <NUM>, the shear force is also significant to prevent the stylus <NUM> from falling off, thereby fastening the stylus <NUM> reliably.

In another implementation of this embodiment, the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. Different from the foregoing embodiments, referring to <FIG> is a schematic diagram of a structure of a magnetic acting force between still another magnet <NUM> and a stylus fastener. In a direction around the X axis, the inner wall surface <NUM> includes a first area <NUM> and a second area <NUM>, and a density of magnetic lines of the first area <NUM> is higher than that of the second area <NUM>; and in the direction perpendicular to the X axis, the first wall surface <NUM> is opposite to a part of the first area <NUM>, and the second wall surface <NUM> is opposite to a part of the second area <NUM>. In other implementations, the first wall surface <NUM> is disposed opposite to a part of the first area <NUM>, and the second wall surface <NUM> is disposed opposite to the entire second area <NUM>. In other implementations, the first wall surface <NUM> is disposed opposite to the entire first area <NUM>, and the second wall surface <NUM> is disposed opposite to a part of the second area <NUM>. In the foregoing implementations, a density of magnetic lines of the first area <NUM> that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> may be higher than that of the second area <NUM> that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>. In an implementation, a distance between the first wall surface <NUM> of the magnet <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is a first distance, a distance between the second wall surface <NUM> and the inner wall surface <NUM> is a second distance, and the first distance is less than the second distance. The inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic adsorption force F13, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic repulsion force F23. A force generated by the magnetic adsorption force F13 on the stylus <NUM> and a force generated by the magnetic repulsion force F23 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F03 between the magnet <NUM> and the stylus fastener <NUM> is equal to F <NUM>+F23, and the magnetic acting force F03 is radially outward along the stylus fastener <NUM>. A density of magnetic lines of an area that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> is higher, so that the magnetic adsorption force is strengthened, and the first distance is less than the second distance, so as to further strengthen the magnetic adsorption force, and finally ensure that the magnetic adsorption force is obviously greater than the magnetic repulsion force. Therefore, connection stability between the magnet <NUM> and the stylus fastener <NUM> is greatly improved, thereby improving fastening stability of the stylus <NUM>.

In still another implementation, referring to <FIG> is a schematic diagram of a structure of a magnetic acting force between yet another magnet <NUM> and a stylus fastener. Magnets <NUM> are fastened in the middle of the accommodating space <NUM> in the X-axis direction, and in this case, the magnets <NUM> are symmetrically disposed along an axis of the penholder in the X-axis direction. In the direction around the X axis, the inner wall surface <NUM> includes a first area <NUM> and a second area <NUM>. A density of magnetic lines of the first area <NUM> is higher than that of the second area <NUM>, and in the direction perpendicular to the X axis, the first wall surface <NUM> is opposite to a part of the first area <NUM>, and the second wall surface <NUM> is opposite to a part of the second area <NUM>. In other implementations, the first wall surface <NUM> is disposed opposite to a part of the first area <NUM>, and the second wall surface <NUM> is disposed opposite to the entire second area <NUM>. In other implementations, the first wall surface <NUM> is disposed opposite to the entire first area <NUM>, and the second wall surface <NUM> is disposed opposite to a part of the second area <NUM>. In the foregoing implementations, a density of magnetic lines of the first area <NUM> that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> may be higher than that of the second area <NUM> that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>. That the first wall surface <NUM> is opposite to the entire first area <NUM> means that a projection that is of the first wall surface <NUM> and that is on the first area <NUM> in the Z-axis direction coincides with the first area <NUM>; and that the first wall surface <NUM> is opposite to a part of the first area <NUM> means that a projection that is of the first wall surface and that is on the first area <NUM> in the Z-axis direction covers a part of the first area <NUM>, but does not cover the entire first area <NUM>. For a relative relationship between the second wall surface <NUM> and the second area <NUM>, refer to a relative relationship between the first wall surface <NUM> and the first area <NUM>. Therefore, details are not described again.

After the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM>, an axis of the accommodating space <NUM> of the penholder in the X-axis direction coincides with an axis of the mounting space <NUM> of the stylus fastener <NUM> in the X-axis direction. Therefore, in the direction perpendicular to the X axis, the first distance between the first wall surface <NUM> and the inner wall surface <NUM> is the same as the second distance between the second wall surface <NUM> and the inner wall surface <NUM>. The inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic adsorption force F14, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic repulsion force F24. A force generated by the magnetic adsorption force F14 on the stylus <NUM> and a force generated by the magnetic repulsion force F24 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F04 between the magnet <NUM> and the stylus fastener <NUM> is equal to F14+F24, and the magnetic acting force F04 is radially outward along the stylus fastener <NUM>. Therefore, the first distance is equal to the second distance, and a density of magnetic lines of an area that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> is higher than that of an area that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>, so that the magnetic adsorption force is strengthened, thereby ensuring that the magnetic adsorption force is greater than the magnetic repulsion force, and improving fastening reliability of the stylus <NUM>.

A 3D simulation software is used to simulate a fastening force between the stylus <NUM> and the stylus fastener <NUM> in the first embodiment of this embodiment. More specifically, a maxwell 3D (maxwell 3D) simulation software is used for simulation, so as to analyze a first magnetic force and a shear force between the magnet <NUM> and the stylus fastener <NUM>, and analyze a first magnetic force and a shear force between an iron ring and a magnet <NUM> in the conventional technology. Results from simulation analysis are shown in Table <NUM>. The shear force is a force that is generated by the first magnetic force to stabilize the stylus <NUM> in the stylus fastener <NUM> when the stylus <NUM> tends to fall off from the stylus fastener <NUM>, and a direction of the shear force is parallel to the X-axis direction.

During the simulation analysis, the magnet <NUM> matched with the iron ring and the magnet <NUM> matched with the stylus fastener <NUM> have the same properties, such as volume. It can be learned from Table <NUM> that when the magnet <NUM> cooperates with the iron ring to fasten the stylus <NUM>, a magnetic acting force between the magnet <NUM> and the iron ring is <NUM> mN, and a shear force between the magnet <NUM> and the iron ring is <NUM> N; and when the magnet <NUM> cooperates with the stylus fastener <NUM> to fasten the stylus <NUM>, a magnetic acting force between the magnet <NUM> and the stylus fastener <NUM> is <NUM> mN, and a shear force between the magnet <NUM> and the stylus fastener <NUM> is <NUM> N. An optimized amount of the magnetic acting force is as follows: (<NUM>-<NUM>)/<NUM>≈<NUM>%; and an optimized amount of the shear force is as follows: (<NUM>-<NUM>)/<NUM>≈<NUM>%. It can be learned that when the stylus fastener <NUM> cooperates with the magnet <NUM> to fasten the stylus <NUM>, an optimized amount of the magnetic acting force is <NUM>%, and an optimized amount of the shear force is <NUM>%.

It can be learned that compared with an annular magnet <NUM> in the conventional technology, a magnetic acting force and a shear force of an annular stylus fastener <NUM> provided with radial magnetic lines are greatly improved, especially the shear force is increased at a newton level, so that the shear force is improved more significantly, thereby effectively preventing the stylus <NUM> from falling off. In this embodiment of this application, the magnet <NUM> cooperates with the stylus fastener <NUM>, and magnetic lines of the stylus fastener <NUM> are radially distributed, so that the magnetic acting force and the shear force are effectively strengthened, and fastening reliability of the stylus <NUM> is improved to prevent the stylus <NUM> from falling off from the electronic device <NUM>, and the stylus <NUM> can be easily placed and taken.

A second embodiment of this application differs from the foregoing embodiments in that the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. When the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force, the first magnetic force is a magnetic repulsion force, and the magnetic adsorption force and the magnetic repulsion force have the same direction. Due to the magnetic repulsion force, the stylus <NUM> tends to move close to a direction of the adsorption force, so as to further improve fastening reliability of the stylus <NUM>. If the magnetic adsorption force is greater than the magnetic repulsion force, a situation in which the magnet <NUM> and the stylus fastener <NUM> repel each other due to an excessive magnetic repulsion force may be prevented, so as to avoid affecting fastening of the stylus <NUM>.

In the second embodiment, referring to <FIG> is a schematic diagram showing a direction of a magnetic acting force between still yet another magnet <NUM> and a stylus fastener <NUM>. The second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. A direction of magnetic lines of the body 240A is from the inner wall surface <NUM> to the outer wall surface <NUM>, and the magnetic lines of the body 240A are evenly distributed in the X-axis direction. The first polarity is an S pole, the second polarity is an N pole, the first wall surface <NUM> has a polarity of the S pole, and the second wall surface <NUM> has a polarity of the N pole. In this case, the inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic repulsion force F15, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic adsorption force F25. A force generated by the magnetic repulsion force F15 on the stylus <NUM> and a force generated by the magnetic adsorption force F25 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F05 between the magnet <NUM> and the stylus fastener <NUM> is equal to F15+F25, and the magnetic acting force F05 is radially outward along the stylus fastener <NUM>, so that a fastening force on the stylus <NUM> from the stylus fastener is strengthened, thereby further improving the fastening stability.

In another implementation of the second embodiment, referring to <FIG> is a schematic diagram showing a direction of a magnetic acting force between a further magnet <NUM> and a stylus fastener <NUM>. A direction of magnetic lines of the body 240A is from the outer wall surface <NUM> to the inner wall surface <NUM>, the first polarity is an N pole, the second polarity is an S pole, the first wall surface <NUM> has a polarity of the N pole, and the second wall surface <NUM> has a polarity of the S pole. In this case, the inner wall surface <NUM> and the first wall surface <NUM> generate a magnetic repulsion force F <NUM>, and the inner wall surface <NUM> and the second wall surface <NUM> generate a magnetic adsorption force F26. A force generated by the magnetic repulsion force F16 on the stylus <NUM> and a force generated by the magnetic adsorption force F26 on the stylus <NUM> have the same direction, and both are radially outward along the stylus fastener <NUM>. Therefore, a magnetic acting force F06 between the magnet <NUM> and the stylus fastener <NUM> is equal to F16+F26, and the magnetic acting force F06 is radially outward along the stylus fastener <NUM>, so that a fastening force on the stylus <NUM> from the stylus fastener is strengthened, thereby improving fastening stability of the stylus <NUM>.

In an implementation of the second embodiment, the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. Magnetic lines of the body 240A are evenly distributed in an extension direction of the body 240A. In the direction perpendicular to the X axis, a distance between the first wall surface <NUM> and the inner wall surface <NUM> is a first distance, a distance between the second wall surface <NUM> and the inner wall surface <NUM> is a second distance, and the first distance is greater than the second distance, so that the magnetic adsorption force is strengthened. Therefore, the magnetic repulsion force F21 is less than the magnetic adsorption force F11. Therefore, when the stylus <NUM> tends to fall off from the stylus fastener <NUM>, the shear force is also significant to prevent the stylus <NUM> from falling off, thereby fastening the stylus <NUM> reliably.

In another implementation of the second embodiment, the second magnetic force is greater than the first magnetic force, and the second magnetic force is a magnetic adsorption force. Specifically, in a direction around the X axis, the inner wall surface <NUM> includes a first area and a second area, and a density of magnetic lines of the first area is lower than that of the second area; and in the direction perpendicular to the X axis, the first wall surface <NUM> is opposite to a part of the first area, and the second wall surface <NUM> is opposite to a part of the second area. In other implementations, the first wall surface <NUM> is opposite to a part of the first area, and the second wall surface <NUM> is opposite to the entire second area. In other implementations, the first wall surface <NUM> is opposite to the entire first area, and the second wall surface <NUM> is opposite to a part of the second area. In the foregoing implementations, a density of magnetic lines of the first area that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> may be lower than that of the second area that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>. In an implementation, a distance between the first wall surface <NUM> of the magnet <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is a first distance, a distance between the second wall surface <NUM> and the inner wall surface <NUM> is a second distance, and the first distance is greater than the second distance. Therefore, a density of magnetic lines of an area that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM> is higher, so that the magnetic adsorption force is strengthened, and the first distance is greater than the second distance, so as to further strengthen the magnetic adsorption force, and finally ensure that the magnetic adsorption force is obviously greater than the magnetic repulsion force. Therefore, connection stability between the magnet <NUM> and the stylus fastener <NUM> is greatly improved, thereby improving fastening stability of the stylus <NUM>.

In still another implementation of the second embodiment, magnets <NUM> are fastened in the middle of the accommodating space <NUM> in the X-axis direction, and in this case, the magnets <NUM> are symmetrically disposed along an axis of the penholder in the X-axis direction. In addition, in the direction around the X axis, the inner wall surface <NUM> includes a first area and a second area, and a density of magnetic lines of the first area is lower than that of the second area; and in the direction perpendicular to the X axis, the first wall surface <NUM> is opposite to a part of the first area, and the second wall surface <NUM> is opposite to a part of the second area. In other implementations, the first wall surface <NUM> is opposite to a part of the first area, and the second wall surface <NUM> is opposite to the entire second area. In other implementations, the first wall surface <NUM> is opposite to the entire first area, and the second wall surface <NUM> is opposite to a part of the second area. In the foregoing implementations, a density of magnetic lines of the first area that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> may be lower than that of the second area that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>. After the stylus <NUM> is mounted in the mounting space <NUM> of the stylus fastener <NUM>, an axis of the accommodating space <NUM> of the penholder in the X-axis direction coincides with an axis of the mounting space <NUM> of the stylus fastener <NUM> in the X-axis direction. Therefore, in the direction perpendicular to the X axis, the first distance between the first wall surface <NUM> and the inner wall surface <NUM> is the same as the second distance between the second wall surface <NUM> and the inner wall surface <NUM>. Therefore, the first distance is equal to the second distance, and a density of magnetic lines of an area that is of the inner wall surface <NUM> and that is opposite to the first wall surface <NUM> is lower than that of an area that is of the inner wall surface <NUM> and that is opposite to the second wall surface <NUM>, so that the magnetic adsorption force is strengthened, thereby ensuring that the magnetic adsorption force is greater than the magnetic repulsion force, and improving fastening reliability of the stylus <NUM>.

Still referring to <FIG>, in an embodiment, widths of the first wall surface <NUM>, the second wall surface <NUM>, and the inner wall surface <NUM> are the same in the X-axis direction. Assembly errors and machining errors are allowed here. Specifically, because a difference in dimensions of the magnet <NUM> and the stylus fastener <NUM> in the X-axis direction affects a position where the stylus <NUM> is inserted, the larger the difference in dimensions of the magnet <NUM> and the stylus fastener <NUM>, the position of the stylus <NUM> may change each time the stylus <NUM> is inserted. Therefore, if the first wall surface <NUM>, the second wall surface <NUM> and the inner wall surface <NUM> are disposed to have the same width in the X-axis direction, the magnet <NUM> and the stylus fastener <NUM> are aligned in the X-axis direction when the stylus <NUM> is mounted in the mounting space <NUM> in the X-axis direction. Then, each time the stylus <NUM> is inserted into the stylus fastener <NUM> after use, the position of the stylus <NUM> is basically fixed to prevent a tip or a protective cap of the stylus <NUM> from extending out of the support apparatus <NUM>. Dimensions of the first wall surface <NUM>, the second wall surface <NUM>, and the inner wall surface <NUM> are the same within allowable ranges of machining errors and assembly errors.

In a specific implementation, a width of the first wall surface <NUM> and a width of the second wall surface <NUM> of the magnet <NUM>, and a width of the inner wall surface <NUM> of the stylus fastener <NUM> are the same. Here, the width of the first wall surface <NUM>, the width of the second wall surface <NUM>, and the width of the inner wall surface <NUM> are dimensions in the X-axis direction. Specifically, a width of the inner wall surface <NUM> of the stylus fastener <NUM> is a, and widths of both the first wall surface <NUM> and the second wall surface <NUM> of the magnet <NUM> are b, and then in an implementation, a is equal to b. In another implementation, due to existence of machining errors and assembly errors, the width of the first wall surface <NUM> and the width of the second wall surface <NUM> of the magnet <NUM>, and the width of the inner wall surface <NUM> of the stylus fastener <NUM> are also considered to be the same when a and b satisfy the following relationship: a is greater than or equal to <NUM>. 9a and less than or equal to <NUM>. Therefore, after the stylus <NUM> is inserted into the mounting space <NUM>, the first wall surface <NUM>, the second wall surface <NUM>, and the inner wall surface <NUM> will not have different locating positions each time due to width differences, to ensure that the stylus fastener and the magnet <NUM> are basically aligned in a width direction, so that fastened positions of the stylus <NUM> are basically consistent after each insertion. This prevents the stylus <NUM> from being inserted at a different position each time, and ensures that neither a tip nor a protective cap of the stylus <NUM> extends beyond a contour of the support apparatus <NUM> each time the stylus <NUM> is inserted.

Still referring to <FIG>, in the X-axis direction, widths of the inner wall surface <NUM> and the outer wall surface <NUM> of the stylus fastener are the same. Machining errors are allowed here. In a specific implementation, a width of the inner wall surface <NUM> is a, and a width of the outer wall surface <NUM> is c, and then in an implementation, a is equal to c. In another implementation, a and c are also considered to be the same if the following relationship is satisfied: a is greater than or equal to <NUM>. 9c and less than or equal to <NUM>. Therefore, machining of the stylus fastener can be facilitated.

Still referring to <FIG>, in this embodiment, the accommodating space <NUM> of the penholder is provided with a plurality of magnets <NUM>. Therefore, correspondingly, a quantity of the stylus fasteners <NUM> is more than one, the plurality of stylus fasteners <NUM> are equally spaced in the X-axis direction, and mounting spaces <NUM> of the plurality of stylus fasteners <NUM> are coaxially disposed, where "a plurality of" means two or more. When the stylus <NUM> is mounted, the stylus <NUM> sequentially runs through the plurality of stylus fasteners <NUM>. In this case, the plurality of magnets <NUM> are in a one-to-one correspondence with the plurality of stylus fasteners <NUM>, and a magnetic acting force is generated between each set of magnets <NUM> and stylus fasteners <NUM>, so that fastening reliability of the stylus <NUM> can be improved. The plurality of stylus fasteners <NUM> are equally spaced, so that the stylus <NUM> is uniformly stressed and has higher stability. In other embodiments, a quantity of the stylus fasteners <NUM> is one, the one stylus fastener <NUM> is fastened in the middle of the accommodating groove <NUM>, and the middle of the accommodating groove <NUM> means any position between two ends of the accommodating groove <NUM>, so as to reduce costs, reduce a weight of the support apparatus <NUM>, and reduce a burden of a user to carry the electronic device <NUM> provided with the support apparatus <NUM>. The one stylus fastener <NUM> may also be fastened at either end of the accommodating groove <NUM> to facilitate mounting of the stylus fastener <NUM>.

In this embodiment, a quantity of the stylus fasteners <NUM> is three, two of the stylus fasteners <NUM> are equally spaced on a side wall of the accommodating groove <NUM> of the connecting part <NUM> in an X-axis direction of the accommodating groove <NUM>, and an X-axis direction of the stylus fasteners <NUM> is the same as that of the accommodating groove <NUM>. Correspondingly, a quantity of the magnets <NUM> on the stylus <NUM> is three. After the stylus <NUM> is mounted in mounting spaces <NUM> of the stylus fasteners <NUM>, the three stylus fasteners <NUM> are in a one-to-one correspondence with the three magnets <NUM>, which can improve fastening strength of the stylus fastener <NUM>. Two of the three stylus fasteners <NUM> fasten two ends of the stylus <NUM> in the X-axis direction respectively, and the other stylus fastener <NUM> fastens a middle of the stylus <NUM> in the X-axis direction, so that the stylus <NUM> is uniformly stressed and has high fastening reliability.

In an embodiment, a quantity of the stylus fasteners <NUM> is four, the four stylus fasteners <NUM> are equally spaced on a side wall of the accommodating groove <NUM> of the connecting part <NUM> in an X-axis direction of the accommodating groove <NUM>, and an X-axis direction of the stylus fasteners <NUM> is the same as that of the accommodating groove <NUM>. Correspondingly, a quantity of the magnets <NUM> on the stylus <NUM> is four. After the stylus <NUM> is mounted in mounting spaces <NUM>, the four stylus fasteners <NUM> are in a one-to-one correspondence with four magnets <NUM>, so as to fasten the stylus <NUM> reliably. Two of the four stylus fasteners <NUM> fasten two ends of the stylus <NUM> in the X-axis direction respectively, and the other two stylus fasteners <NUM> fasten a middle of the stylus <NUM> in the X-axis direction. Because the stylus <NUM> is long, the two stylus fasteners in the middle improve fastening reliability at the middle of the stylus <NUM>, thereby further improving firmness of the stylus <NUM>.

The stylus fastener according to any one of the foregoing embodiments may be integrally formed. <FIG> is a schematic diagram of a structure of an integrally formed stylus fastener. The integrally formed stylus fastener has high uniformity of magnetic lines, and stability of the first magnetic force and the second magnetic force between the integrally formed stylus fastener and the magnet <NUM> is higher, so as to improve fastening stability of the stylus <NUM>.

In this embodiment, referring to <FIG> is a schematic diagram of a structure of a stylus fastener that is equally divided into two parts. A stylus fastener <NUM> is annular and is separately formed. Specifically, the stylus fastener <NUM> is divided into two magnets for machining, and the two parts are a first magnet <NUM> and a second magnet <NUM>. Both the first magnet <NUM> and the second magnet <NUM> are semicircular, and an inner cambered surface of the first magnet <NUM> and an inner cambered surface of the second magnet <NUM> enclose into a circular mounting space <NUM>. In other embodiments, lengths, widths, and thicknesses of the first magnet <NUM> and the second magnet <NUM> are equal, and central angles of the first magnet <NUM> and the second magnet <NUM> are both <NUM>°. After the first magnet <NUM> and the second magnet <NUM> are mounted in the support apparatus <NUM>, there is a gap between the first magnet <NUM> and the second magnet <NUM>, which can ensure an adsorption force between the stylus fastener and the magnets of the stylus, and can also reduce volumes of the first magnet <NUM> and the second magnet <NUM> to save costs. In some other embodiments, the first magnet <NUM> and the second magnet <NUM> are two unequal parts, a central angle of the first magnet <NUM> is <NUM>°, and a central angle of the second magnet is <NUM>°; or a central angle of the first magnet is <NUM>°, and a central angle of the second magnet is <NUM>°. After the stylus fastener <NUM> is divided into two parts for machining, magnetization difficulty is reduced, and magnetization costs are reduced. In other embodiments, the stylus fastener is integrally formed into a whole ring, or is separately formed into three parts, four parts, five parts, and the like. The stylus fastener is divided into two magnets for machining. A magnet volume is less than that of a whole-ring stylus fastener, so that the stylus fastener cannot be easily damaged during transportation, and transportation costs are reduced. After the stylus fastener is divided into two magnets, an instantaneous current required for magnetizing is lower than that of the whole-ring stylus fastener, and an impact force of a magnetic field generated by the instantaneous current on the magnet is weakened. Therefore, there is no need to make a special clamp for magnetizing the magnet, and a common clamp may be used for magnetization, so as to reduce magnetization costs.

In this embodiment, the stylus fastener <NUM> is fastened in the accommodating groove <NUM> by using an adhesive. Specifically, referring to <FIG> is a schematic diagram of a structure of an annular groove disposed on a wall of an accommodating groove of a connecting part. The annular groove <NUM> is disposed on a wall of the accommodating groove <NUM>, the annular groove <NUM> is formed around the X axis, and the stylus fastener <NUM> is mounted in the annular groove <NUM>. Specifically, after coating the adhesive on the outer wall surface <NUM> of the first magnet <NUM>, and coating the adhesive on the outer wall surface <NUM> of the second magnet <NUM>, the first magnet <NUM> and the second magnet <NUM> are mounted in the annular groove <NUM>, so that the stylus fastener <NUM> is fastened in the accommodating groove <NUM> by a limiting effect of the annular groove <NUM> and a fastening effect of the adhesive. A width of the annular groove <NUM> in the X-axis direction is slightly greater than that of the stylus fastener <NUM> in the X-axis direction, so that the first magnet <NUM> and the second magnet <NUM> may be smoothly mounted in the annular groove <NUM>.

In an embodiment, referring to <FIG> is a schematic diagram of a structure of a stylus fastener that is equally divided into four parts. The stylus fastener <NUM> is divided into four magnets, specifically including: a first magnet 2401b, a second magnet 2402b, a third magnet 2403b, and a fourth magnet 2404b. In the case of equal parts, central angles of the first magnet 2401b to the fourth magnet 2404b are all <NUM>°. After the stylus fastener is divided into four parts, a magnet volume of each part is further reduced, so that a damage rate during transportation is further reduced, thereby reducing costs. During magnetization, an instantaneous current required for magnetization is further reduced, a required clamp is further simplified, and a volume of the clamp is correspondingly reduced, thereby further reducing magnetization costs.

In another embodiment, referring to <FIG> is a schematic diagram of a structure of a stylus fastener that is equally divided into six parts. The stylus fastener <NUM> is divided into six magnets, specifically including: a first magnet 2401d, a second magnet 2402d, a third magnet 2403d, a fourth magnet 2404d, a fifth magnet 2405d, and a sixth magnet 2406d. In the case of equal parts, central angles of the first magnet 2401d to the sixth magnet 2406d are all <NUM>°. After the stylus fastener is divided into six parts, a magnet volume of each part is smaller, so that the stylus fastener is easier to transport and has lower transportation costs. During magnetization, an instantaneous current required for magnetization is higher, and a clamp has a simpler structure and a smaller volume, so that magnetization costs are lower.

In another embodiment of this application, referring to <FIG> is a schematic diagram of a structure in which a stylus <NUM> is mounted in a stylus fastener and stylus fasteners are randomly distributed. The accommodating space <NUM> of the penholder is provided with a plurality of magnets <NUM>, and the plurality of magnets <NUM> are randomly arranged in the X-axis direction of the accommodating space <NUM>. Therefore, correspondingly, a plurality of stylus fasteners <NUM> are randomly arranged in the X-axis direction. A spacing between magnets <NUM> located in the middle of the accommodating groove <NUM> in the X-axis direction is less than a spacing between magnets <NUM> located at ends. Because the stylus <NUM> is long, the magnets <NUM> in the middle of the accommodating groove <NUM> are densely distributed, so that fastening strength in the middle of the stylus <NUM> may be improved, and the entire stylus <NUM> can be reliably fastened. For example, a quantity of the magnets <NUM> is four, and correspondingly, a quantity of the stylus fasteners <NUM> is four. The four stylus fasteners <NUM> are a first stylus fastener 240a, a second stylus fastener 240b, a third stylus fastener 240c, and a fourth stylus fastener 240d; a distance between the first stylus fastener 240a and the second stylus fastener 240b is L1, a distance between the second stylus fastener 240b and the third stylus fastener 240c is L2, and a distance between the third stylus fastener 240c and the fourth stylus fastener 240d is L3, where L1 is equal to L3, L1 is greater than L2; and the second stylus fastener 240b and the third stylus fastener 240c are symmetrically distributed along a central plane in the X-axis direction of the accommodating groove <NUM>. After the stylus <NUM> is inserted into the stylus fastener <NUM>, the four stylus fasteners <NUM> are in a one-to-one correspondence with the four magnets <NUM>. The second stylus fastener 240b and the third stylus fastener 240c can better fasten the middle of the stylus <NUM>, and the first stylus fastener 240a and the fourth stylus fastener 240d can better fasten two ends of the stylus <NUM>, so as to improve fastening reliability of the stylus <NUM>. In other embodiments, both the second stylus fastener 240b and the third stylus fastener 240c are located in the middle of the accommodating groove <NUM> in the X-axis direction, and are stacked in the X-axis direction, so as to better fasten the stylus <NUM>.

In this embodiment, referring to <FIG> is a sectional view of a stylus <NUM> mounted in a stylus fastener <NUM>. The stylus fastener <NUM> has a circular annular shape, the mounting space <NUM> also has a circular annular shape, and a cross section of the stylus <NUM> mounted in the mounting space <NUM> also has a circular shape. The stylus <NUM> may be attached to the inner wall surface <NUM> after being inserted into the mounting space <NUM>, so as to improve fastening stability. In other embodiments, the stylus fastener <NUM> may be a stylus fastener <NUM> that has a mounting space <NUM> and that is of another shape, such as square, ellipse, and triangle, provided that the stylus does not fall off after being inserted into the mounting space <NUM>.

In an embodiment, referring to <FIG> is a sectional view of a stylus <NUM> that is of another shape that is mounted in a stylus fastener <NUM>. In this embodiment, the stylus fastener <NUM> has a square annular shape, the mounting space <NUM> is square, and a cross section of the stylus <NUM> mounted in the mounting space <NUM> is also square. The stylus <NUM> is attached to the inner wall surface <NUM> after being inserted into the mounting space <NUM>, so as to improve fastening stability. A cross section of the outer wall surface <NUM> of the stylus fastener <NUM> is also square, and shapes of the inner wall surface <NUM> and the outer wall surface <NUM> are the same, which also facilitates machining, thereby reducing costs. The outer wall surface <NUM> with a square cross section has four flat surfaces P, any one of the four flat surfaces P is used as a first plane, and a second plane is disposed on a wall of the accommodating groove <NUM> correspondingly. When the stylus fastener <NUM> is fastened to the support apparatus <NUM>, the first plane is attached to the second plane, so that the stylus fastener <NUM> is in a surface-to-surface contact with the wall of the accommodating groove <NUM>, thereby improving fastening reliability of the stylus fastener <NUM>. The fastening reliability of the stylus fastener <NUM> is improved, and correspondingly, fastening reliability of the stylus <NUM> is ensured.

In an embodiment, referring to <FIG> is a sectional view of a stylus <NUM> that is of still another shape and that is mounted in a stylus fastener <NUM>. In this embodiment, the stylus fastener <NUM> has an elliptical annular shape, the mounting space <NUM> is elliptical, and a cross section of the stylus <NUM> mounted in the mounting space <NUM> is also elliptical. The stylus <NUM> is attached to the inner wall surface <NUM> after being inserted into the mounting space <NUM>. Therefore, a contact area between the stylus <NUM> and the inner wall surface <NUM> of the stylus fastener <NUM> is large, so as to prevent the penholder <NUM> from rotating in the mounting space <NUM>, thereby improving fastening reliability of the stylus <NUM>, and preventing the stylus <NUM> from falling off. Apart of the outer wall surface <NUM> of the stylus fastener <NUM> is arc-shaped, the other part is a flat surface P, and the part that is the flat surface P is parallel to a long axis of an ellipse. Therefore, a volume of the stylus fastener <NUM> may be less than that of a stylus fastener with an elliptical outer wall surface <NUM>, so that a space occupied by the stylus fastener <NUM> can be reduced, and the outer wall surface <NUM> of the part that is the flat surface P of the stylus fastener <NUM> can be in contact with the support apparatus <NUM>. Therefore, the stylus fastener <NUM> is in a surface-to-surface contact with the support apparatus <NUM>, thereby improving fastening reliability of the stylus fastener <NUM>.

In this embodiment, the stylus fastener is radially magnetized. During magnetization, the stylus fastener is clamped by using a customized magnetization clamp, then an instantaneous current is applied to the stylus fastener by using an electrified coil, and the stylus fastener is magnetized by using an instantaneous magnetic field generated by the instantaneous current. The integrally formed stylus fastener has a high structural strength and can be easily mounted on the support apparatus <NUM>, so that mounting difficulty may be reduced, thereby accelerating production and improving production efficiency.

A magnetization manner is constant current magnetization or pulse magnetization, which is not limited in this embodiment.

After the magnetization, magnetization uniformity of the stylus fastener is tested. Specifically, a magnetization uniformity test process is as follows: A plurality of test points are selected at different positions on a surface of the stylus fastener after the magnetization to detect surface magnetism at each test point, and errors in surface magnetism at the test points are compared. If errors between the test points are less than <NUM> millitesla (mT), it proves that magnetization uniformity is good. On the contrary, if errors between the test points are greater than or equal to <NUM> mT, it proves that magnetization uniformity is poor; and in this case, remagnetization is required, and then demagnetization is required.

<FIG> is a schematic diagram of a sampling structure of test points for testing magnetization uniformity of a stylus fastener. Specifically, a teslameter is used to take three test points A1, A2, and A3 in the middle of the inner wall surface <NUM> of the stylus fastener <NUM>, and take three test points B <NUM>, B2, and B3 at an edge of the inner wall surface <NUM>. Then a mean value P1 of all test points is calculated, P1=(A1+A2+A3+B1+B2+B3)/<NUM>, and an error between each test point and the mean value P1 is compared. If errors between more than <NUM>% of all test points and the mean value are less than <NUM> mT, it proves that magnetization uniformity of the inner wall surface <NUM> of the stylus fastener <NUM> is good.

A teslameter is used to take three test points C <NUM>, C2, and C3 in the middle of the outer wall surface <NUM> of the stylus fastener <NUM>, and take three test points D1, D2, and D3 at an edge of the outer wall surface <NUM>. Then a mean value P2 of all test points is calculated, P2=(C1+C2+C3+D1+D2+D3)/<NUM>, and an error between each test point and the mean value P2 is compared. If errors between more than <NUM>% of all test points and the mean value are less than <NUM> mT, it proves that magnetization uniformity of the outer wall surface <NUM> of the stylus fastener <NUM> is good.

<FIG> is a schematic diagram of a structure of a magnetization clamp. Specifically, due to a magnetic field generated by an instantaneous current at the moment of magnetization, the stylus fastener is subjected to a strong rebound force, and the rebound force may cause the stylus fastener to jump, so that a magnetization clamp <NUM> needs to clamp the stylus fastener to prevent the stylus fastener from jumping. Specifically, the magnetization clamp <NUM> includes a workbench <NUM>, a first bracket <NUM>, a second bracket <NUM>, a slide rail <NUM>, a first clip <NUM>, a second clip <NUM>, and a locking rod <NUM>. The workbench <NUM> has a placement end face <NUM>, a bottom end of the first bracket <NUM> and the slide rail <NUM> are fastened on the placement end face <NUM>, a bottom end of the second bracket <NUM> is connected to the slide rail <NUM>, and the second bracket <NUM> may slide along the slide rail <NUM> to move close to or away from the first bracket <NUM>. A bottom end of the second bracket <NUM> is provided with a locating hole, and a plug-in hole <NUM> corresponding to the locating hole is provided on the slide rail <NUM>. After the second bracket <NUM> moves in place, the locking rod <NUM> is inserted into the plug-in hole <NUM> and the locating hole to lock the second bracket <NUM>. The first clip <NUM> is fastened on top of the first bracket <NUM>, and the second clip <NUM> is fastened on top of the second bracket <NUM>. When the second bracket <NUM> moves, the second clip <NUM> is driven to move, so that the second clip <NUM> is close to or away from the first clip <NUM>. The first clip <NUM> is provided with a first clamping groove facing the second clip <NUM>, and the second clip <NUM> is provided with a second clamping groove facing the first clip <NUM>. When the second clip <NUM> is close to the first clip <NUM>, the first clamping groove cooperates with the second clamping groove to clamp the stylus fastener. When the stylus fastener includes two magnets, one of the magnets may be magnetized first, and then the other magnet may be magnetized.

When the stylus fastener is magnetized, the second bracket <NUM> moves in a direction away from the first bracket <NUM> along the slide rail <NUM>, so that the first clamping groove (not shown in the figure) and the second clamping groove (not shown in the figure) are away from each other. Then, the stylus fastener <NUM> is placed between the first clamping groove and the second clamping groove by using a manipulator or manually, and the stylus fastener is as close to the first clamping groove as possible or is in direct contact with an inner wall of the first clamping groove. Then, the second bracket <NUM> moves in a direction close to the first bracket <NUM> along the slide rail <NUM>, so that the first clamping groove and the second clamping groove are close to each other until the first clamping groove and the second clamping groove clamp the stylus fastener. Then, the locking rod <NUM> is inserted into the plug-in hole <NUM> and the locating hole to lock the second bracket <NUM>, so as to prevent the stylus fastener <NUM> from falling off due to shaking of the second clip <NUM>.

Still referring to <FIG>, a driving component <NUM> is disposed on the placement end face <NUM>, a driving end <NUM> of the driving component <NUM> is fastened to the second bracket <NUM>, and the driving component <NUM> drives the second bracket <NUM> to move along the slide rail <NUM>, so as to increase a degree of automation, accelerate production, and improve production efficiency. The driving component <NUM> is specifically a cylinder or a motor. When the driving component <NUM> is a cylinder, a connecting rod of the cylinder is fixedly connected to the second bracket <NUM> as a driving end <NUM>; or when the driving component <NUM> is a motor, a driving shaft of the motor is fixedly connected to the second bracket <NUM> as a driving end <NUM>.

Claim 1:
A support apparatus (<NUM>), wherein the support apparatus (<NUM>) comprises a stylus fastener (<NUM>), the stylus fastener (<NUM>) is configured to fasten a stylus (<NUM>), a magnet (<NUM>) of the stylus (<NUM>) comprises a first wall surface (<NUM>) and a second wall surface (<NUM>) facing away from the first wall surface (<NUM>), and a polarity of the first wall surface (<NUM>) is opposite to that of the second wall surface (<NUM>), the stylus fastener (<NUM>) comprises an annular body (240A) and a mounting space (<NUM>) formed by the body (240A), the body (240A) is magnetic and comprises an inner wall surface (<NUM>) and an outer wall surface (<NUM>), the inner wall surface (<NUM>) faces the mounting space (<NUM>), the outer wall surface (<NUM>) faces away from the inner wall surface (<NUM>), the inner wall surface (<NUM>) has a first polarity, the outer wall surface (<NUM>) has a second polarity, and the first polarity is opposite to the second polarity; and
the stylus (<NUM>) is mounted in the mounting space (<NUM>) in an X-axis direction, so that the stylus fastener (<NUM>) is sleeved onto a periphery of the stylus (<NUM>), and the X-axis direction is a length direction of the support apparatus (<NUM>); and both the first wall surface (<NUM>) and the second wall surface (<NUM>) are disposed opposite to the inner wall surface (<NUM>),
characterised in that
a first magnetic force is generated between the first wall surface (<NUM>) and the inner wall surface (<NUM>), a second magnetic force is generated between the second wall surface (<NUM>) and the inner wall surface (<NUM>), and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet,
wherein in a direction around the X axis, the inner wall surface (<NUM>) of the body (240A) comprises a first area (<NUM>) and a second area (<NUM>), and a density of magnetic lines of the first area is higher than that of the second area; and
wherein, in the direction perpendicular to the X axis, the first wall surface (<NUM>) is opposite to a part of the first area (<NUM>) or the entire first area (<NUM>), and the second wall surface (<NUM>) is opposite to a part of the second area or the entire second area, and
wherein the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force.