Capacitance film of active pen and active pen

Abstract

The utility model provides a capacitance film of an active pen and the active pen. A capacitance film of the active pen is wrapped between an inner pen tube and a shell of the active pen, and the capacitance film comprises a first covering layer, a touch control layer, a second covering layer and an elastic layer which are arranged in a stacked mode. The touch layer comprises a touch electrode layer, a first substrate and a wiring layer which are arranged in a stacked mode. The thickness of the touch electrode layer ranges from 22 micrometers to 30 micrometers, the thickness of the first substrate ranges from 15 micrometers to 25 micrometers, and the thickness of the wiring layer ranges from 22 micrometers to 30 micrometers. The first covering layer covers the touch electrode layer, the second covering layer covers the wiring layer, the first covering layer is attached to a shell of the active pen, and the second covering layer is attached to an inner pen tube of the active pen through the elastic layer. According to the technical scheme, the comprehensive performance of the active pen and the use experience of a user on the active pen can be improved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more specifically, to a capacitive film for an active pen and the active pen itself. Background Technology

[0002] An active stylus, also known as an active pen, is an advanced electronic writing tool that interacts with a touchscreen through built-in electronic components and sensors, providing a more precise and fluid writing experience than traditional passive styluses. With continuous technological advancements, the functionality and performance of active pens are constantly improving, making them an indispensable accessory for smart devices.

[0003] Improving the performance of active pens to enhance the user experience is a pressing technical issue that needs to be addressed. Utility Model Content

[0004] This application provides a capacitive film for an active pen and an active pen, which have superior performance.

[0005] In a first aspect, a capacitive film for an active pen is provided, disposed between the inner pen tube and the outer shell of the active pen. The capacitive film includes: a first cover layer, a touch layer, a second cover layer, and an elastic layer stacked together; wherein the touch layer includes a touch electrode layer, a first substrate, and a wiring layer stacked together; the thickness of the touch electrode layer is between 22 μm and 30 μm, the thickness of the first substrate is between 15 μm and 25 μm, and the thickness of the wiring layer is between 22 μm and 30 μm; the first cover layer covers the touch electrode layer, the second cover layer covers the wiring layer, and the first cover layer is attached to the outer shell of the active pen, and the second cover layer is attached to the inner pen tube of the active pen through the elastic layer.

[0006] The technical solution of this application embodiment provides a capacitor film between the inner pen tube and the outer shell of the active pen. This capacitor film can effectively detect the user's grip on the active pen and also provide more operating areas for the active pen, namely, for detecting user clicks, presses, and other operations on the outer shell, thereby expanding the functionality of the active pen and improving its overall performance and user experience. In this capacitor film, the first and second covering layers can be used to protect the touch layer; the touch electrode layer and the wiring layer are insulated from each other by the first substrate, and the wiring layer is used to realize the wiring distribution of the touch layer; the touch layer can be used to form a capacitor structure, and the user's touch on the active pen can be detected by detecting the capacitance signal of the capacitor structure; by setting the thickness of the touch electrode layer, the first substrate, and the wiring layer to meet the above-mentioned ranges, the touch layer can have a suitable thickness, which is beneficial to reducing the thickness of the capacitor film, thereby reducing the space occupied by the capacitor film in the active pen, and also ensuring that the active pen has better detection performance for user touch.

[0007] In conjunction with the first aspect, in one possible implementation, the active pen also includes an electromagnetic shielding layer disposed between the second cover layer and the inner pen tube of the active pen, with the thickness of the electromagnetic shielding layer between 22 μm and 25 μm.

[0008] In this embodiment, the electromagnetic shielding layer is used to shield electromagnetic interference and reduce mutual interference between the touch signal of the active pen and other signals. By setting the thickness of the electromagnetic shielding layer to meet the above range, the electromagnetic shielding layer can have a suitable thickness, reducing the thickness of the capacitor film, thereby reducing the space occupied by the capacitor film in the active pen.

[0009] In conjunction with the first aspect, in one possible implementation, an electromagnetic shielding layer is disposed between the second covering layer and the elastic layer, a first adhesive layer is disposed between the electromagnetic shielding layer and the elastic layer, and a second adhesive layer is disposed between the elastic layer and the inner pen tube of the active pen. The thickness of the first adhesive layer is between 25 μm and 50 μm, and the thickness of the second adhesive layer is between 25 μm and 50 μm.

[0010] In this embodiment, the first adhesive layer is used to bond the electromagnetic shielding layer and the elastic layer, and the second adhesive layer is used to bond the elastic layer and the inner pen tube of the active pen, which is beneficial to improving the structural stability of the active pen. By setting the thickness of the first adhesive layer and the second adhesive layer to meet the above range respectively, the thickness of the capacitor film can be reduced, thereby reducing the space occupied by the capacitor film in the active pen.

[0011] In conjunction with the first aspect, in one possible implementation, a pressure-sensing layer is further included, which is disposed between the touch layer and the second cover layer; the pressure-sensing layer includes a pressure-sensing electrode layer and a second substrate stacked together, the pressure-sensing electrode layer is connected to the wiring layer in the touch layer, the thickness of the pressure-sensing layer is between 22μm and 30μm, and the thickness of the second substrate is between 12μm and 15μm.

[0012] In this embodiment, the pressure-sensing layer can be used to form a capacitor structure. By detecting the capacitance signal of the capacitor structure, the user's pressure on the active pen can be detected. Multiple pressure-sensing electrodes can be distributed in the pressure-sensing layer. By detecting the capacitance signal (e.g., self-capacitance signal) of the pressure-sensing electrodes, the user's pressure can be detected. By setting the thickness of the pressure-sensing layer and the second substrate to meet the above-mentioned ranges, it is beneficial to reduce the thickness of the capacitor film, thereby reducing the space occupied by the capacitor film in the active pen.

[0013] In conjunction with the first aspect, in one possible implementation, the pressure-sensing electrode layer, the second substrate, and the wiring layer form a double-sided circuit board, the touch electrode layer and the first substrate form a single-sided circuit board, and the double-sided circuit board and the single-sided circuit board are connected by a third adhesive layer, the thickness of which is between 13μm and 30μm.

[0014] In this embodiment, the third adhesive layer is used to bond the double-sided circuit board and the single-sided circuit board, which is beneficial to improving the structural stability of the active pen; by setting the thickness of the third adhesive layer to meet the above range, the thickness of the capacitor film can be reduced, thereby reducing the space occupied by the capacitor film in the active pen.

[0015] In conjunction with the first aspect, in one possible implementation, when the user presses on the outer shell of the active pen, the pressure-sensing electrode layer is used to compress the elastic layer under the user's pressure, so as to cause a change in the thickness of the elastic layer and a change in the distance between the pressure-sensing electrode layer and the inner pen tube. This change in distance is used to characterize the change in capacitance detected by the pressure-sensing electrode layer, wherein the thickness of the elastic layer is between 50 μm and 150 μm.

[0016] In this embodiment, during the user's pressing process, the pressure can squeeze the outer shell and the membrane layer in the capacitor diaphragm, thereby deforming the elastic layer. The inner pen tube of the active pen can be grounded to form the ground terminal of the active pen. When the elastic layer deforms, the capacitance between the pressure sensing electrode in the pressure sensing layer and the active pen changes. By detecting this change in capacitance signal, the user's pressure can be detected.

[0017] In conjunction with the first aspect, in one possible implementation, the number of pressure-sensing electrodes in the pressure-sensing electrode layer is less than or equal to the number of touch electrodes in the touch electrode layer.

[0018] In this embodiment, by setting the number of pressure sensing electrodes in the pressure sensing electrode layer to be less than or equal to the number of touch electrodes in the touch electrode layer, the detection range accuracy of touch detection can be higher, while the detection range accuracy of pressure detection is relatively lower. While taking into account the pressure detection performance, it is beneficial to simplify the hardware and software implementation of pressure detection and improve the overall performance of the active pen.

[0019] In conjunction with the first aspect, in one possible implementation, the first cover layer includes a first polymer layer and a fourth adhesive layer stacked together; the thickness of the first polymer layer is between 12.5 μm and 15 μm, and the thickness of the fourth adhesive layer is between 15 μm and 20 μm.

[0020] In this embodiment, the first polymer layer is used to receive the user's squeezing signal, and the fourth adhesive layer is used to bond the touch layer and the first polymer layer, which helps to improve the structural stability of the active pen; by setting the thickness of the fourth adhesive layer to meet the above range, the thickness of the capacitor film can be reduced, thereby reducing the space occupied by the capacitor film in the active pen.

[0021] In conjunction with the first aspect, in one possible implementation, the second cover layer includes a second polymer layer and a fifth adhesive layer stacked together; the thickness of the second polymer layer is between 12.5 μm and 15 μm, and the thickness of the fifth adhesive layer is between 15 μm and 20 μm.

[0022] In this embodiment, the second polymer layer can be used to protect the touch layer, and the fifth adhesive layer is used to bond the touch layer and the second polymer layer, which is beneficial to improving the structural stability of the active pen. By setting the thickness of the fifth adhesive layer to meet the above range, the thickness of the capacitor film can be reduced, thereby reducing the space occupied by the capacitor film in the active pen.

[0023] In conjunction with the first aspect, in one possible implementation, the capacitor film includes: a detection region and an electrical connection region, with an elastic layer covering the detection region but not the electrical connection region; in the electrical connection region, the capacitor film further includes: a reinforcing layer attached to a first cover layer or a second cover layer.

[0024] In this embodiment, the elastic layer can be used to protect the detection area; by providing a reinforcing layer, support can be provided for the electrical connection area, enhancing the strength and hardness of the electrical connection area.

[0025] In conjunction with the first aspect, in one possible implementation, the second covering layer covers the detection area but not the electrical connection area, and the surface of the pressure sensing electrode layer in the pressure sensing layer is covered with black ink, the thickness of which is between 27.5 μm and 35 μm.

[0026] In this embodiment, by using black ink, it is beneficial to prevent external foreign matter such as water and oxygen from entering the pressure sensing electrode layer, thereby improving the reliability of pressure detection and thus enhancing the stability of the active pen.

[0027] In conjunction with the first aspect, in one possible implementation, a touch chip is disposed in the electrical connection area of ​​the capacitive film, the electrical connection area is located in the axial section of the active pen, and the inner shell of the active pen is disposed on both sides of the electrical connection area.

[0028] In this embodiment, the touch chip is used to control the touch layer and pressure sensing layer in the capacitive film to perform touch detection and pressure detection, and can further process the related capacitive signals of touch detection and pressure detection.

[0029] In conjunction with the first aspect, in one possible implementation, a capacitive film is annularly fitted between the outer shell of the active pen and the inner pen tube of the active pen. The outer wall of the outer shell is deformable when pressed by the user, and the inner pen tube is resistant to deformation when pressed by the user.

[0030] In this embodiment, by setting the outer wall of the shell to deform when the user squeezes it, the thickness of the elastic layer changes. This helps the elastic layer convert the squeezing pressure into a change in the distance between the finger and the touch capacitive layer, which is beneficial for detecting changes in capacitance at the squeezing position. By setting the inner pen tube to resist deformation when the user presses it, the deformation resistance of the active pen can be improved, and the structural stability of the active pen can be further improved.

[0031] In conjunction with the first aspect, in one possible implementation, the capacitive film is positioned in the 1 / 3 to 1 / 2 area of ​​the active pen near the tip. This arrangement facilitates the user's grip and operation of the corresponding area of ​​the capacitive film within the active pen, enhancing the user experience.

[0032] Secondly, an active pen is provided, comprising: a housing, an inner pen tube, and a capacitor film as described in any of the above possible implementations, wherein the capacitor film is disposed between the housing and the inner pen tube. Attached Figure Description

[0033] Figure 1 This is a schematic structural diagram of an electronic device component provided in an embodiment of this application.

[0034] Figure 2 This is a schematic structural diagram of an active pen provided in an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of the structure of the capacitive film of an active pen provided in an embodiment of this application.

[0036] Figure 4 This is another structural schematic diagram of the capacitor film provided in the embodiments of this application.

[0037] Figure 5 This is a schematic diagram of another capacitor film structure provided in an embodiment of this application.

[0038] Figure 6 This is a planar schematic diagram of the touch electrode layer in the capacitor film provided in the embodiments of this application.

[0039] Figure 7 This is a three-dimensional schematic diagram of a capacitor film according to an embodiment of this application.

[0040] Figure 8 This is a planar schematic diagram of an electrical connection region in a capacitor film according to an embodiment of this application.

[0041] Figure 9 This is a schematic cross-sectional view of the capacitor film provided in the embodiments of this application.

[0042] Figure 10 This is a schematic cross-sectional view of the capacitor film provided in the embodiments of this application.

[0043] Figure label:

[0044] Electronic device component 100, active pen 101, housing 1013, inner pen tube 1012, electronic device 102, capacitor film 110, first cover layer 111, first polymer layer 1111, fourth adhesive layer 1112, touch layer 112, touch electrode layer 1121, first substrate 1122, wiring layer 1123, second cover layer 113, second polymer layer 1131, fifth adhesive layer 1132, elastic layer 114, electromagnetic shielding layer 115, first adhesive layer 116, second adhesive layer 117, pressure sensing layer 118, second substrate 1181, pressure sensing electrode layer 1182, third adhesive layer 119, detection area 120, electrical connection area 121, reinforcing layer 122, double-sided circuit board 123, single-sided circuit board 124, adhesive layer 125, adhesive layer 126, black ink 127. Detailed Implementation

[0045] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0046] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0047] In the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more, and "at least one" and "one or more" refer to one, two, or more than two. The singular expressions "a," "an," "the," "the," "this," and "this" are intended to also include expressions such as "one or more," unless the context explicitly indicates otherwise.

[0048] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0049] In the description of the embodiments of this application, the terms "upper," "lower," "inner," "outer," "vertical," and "horizontal," etc., indicate orientations or positional relationships relative to the indicated placement of components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply a specific orientation that the device or component must have, or its construction and operation in a specific orientation. They can change accordingly depending on the orientation of the components in the accompanying drawings, and therefore should not be construed as limiting this application. Furthermore, "vertical" in this application is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0050] In the embodiments of this application, the same reference numerals are used to denote the same component or part. For the same part in the embodiments of this application, only one part or component may be labeled with reference numerals in the figures. It should be understood that the reference numerals also apply to other identical parts or components. In addition, the various parts in the figures are not drawn to actual scale, and the dimensions and sizes of the parts shown in the figures are only exemplary and should not be construed as limiting this application.

[0051] Figure 1 A schematic structural diagram of an electronic device component provided in an embodiment of this application is shown.

[0052] refer to Figure 1 The electronic device component 100 includes an active pen 101 and an electronic device 102. The active pen 101 can provide input to the electronic device 102, and the electronic device 102 can perform an operation in response to the input based on the input from the active pen 101. For example, the electronic device 102 may include a touch screen, on which the active pen 101 can perform touch operations to provide input signals, and correspondingly, the touch screen receives the input signals.

[0053] In some embodiments, the active pen 101 and the electronic device 102 can be connected via a communication network to enable wireless signal interaction. For example, the communication network can be a Wi-Fi network, a Bluetooth network, or other short-range communication networks.

[0054] In this embodiment, the electronic device 102 can be a mobile phone, laptop computer, tablet computer, in-vehicle system, smartwatch, smart bracelet, television, camera, or other device with a touch screen. This application does not impose any special limitations on the specific form of the electronic device 102; for ease of understanding, [further details are provided]. Figure 1 The following explanation uses electronic device 102 as an example, which is a tablet computer.

[0055] Figure 2 A schematic structural diagram of an active pen provided in an embodiment of this application is shown. Figure 2 As shown, the active pen 101 may include: a pen tip 1011, an inner pen tube 1012, and a housing 1013. The pen tip 1011 is connected to one end of the housing 1013, and the connection between the pen tip 1011 and the housing 1013 forms a receiving space, in which the inner pen tube 1012 is housed. Depending on the position and function of the housing 1013, the housing 1013 may also include multiple different areas. For example, as... Figure 2 As shown, the housing 1013 may include a pen-holding area for the user when using the active pen 101, and the size of the pen-holding area can be set according to the actual application.

[0056] For example, the housing 1013 may also include a pen tail, which is the end region of the housing 1013 and is the end opposite to the pen tip 1011. As another example, the housing 1013 may also include a button, which can be used to control the active pen 101 to perform related operations; the housing 1013 may also include an indicator light, which can illuminate to indicate or prompt the user.

[0057] Optionally, in this embodiment, the active pen 101 can be an active capacitive pen or an electromagnetic active pen, etc.

[0058] To improve the user experience of the active pen 101, this application embodiment provides a capacitive film 110 disposed in the active pen 101. The capacitive film 110 can be disposed between the inner pen tube 1012 and the outer shell 1013 of the active pen. When the user holds the active pen 101, their finger can be located in the corresponding area of ​​the capacitive film 110. The user can operate in this area to control the active pen 101, and thus control the electronic device 102 connected to the active pen 101.

[0059] As an example, such as Figure 2As shown, the capacitor film 110 may be annularly wrapped around the inner pen tube 1012. In some alternative embodiments, the capacitor film 110 may be wrapped around a portion of the side of the inner pen tube 1012; for example, the capacitor film may be C-shaped and wrapped around the inner pen tube 1012.

[0060] Figure 3 A schematic diagram of the structure of the capacitive film of an active pen provided in an embodiment of this application is shown.

[0061] like Figure 3 As shown, the capacitor film 110 includes a first cover layer 111, a touch layer 112, a second cover layer 113, and an elastic layer 114 stacked together. The touch layer 112 includes a touch electrode layer 1121, a first substrate 1122, and a wiring layer 1123 stacked together. The thickness of the touch electrode layer 1121 is between 22 μm and 30 μm, the thickness of the first substrate 1122 is between 15 μm and 25 μm, and the thickness of the wiring layer 1123 is between 22 μm and 30 μm. The first cover layer 111 covers the touch electrode layer 1121, the second cover layer 113 covers the wiring layer 1123, and the first cover layer 111 is attached to the outer shell 1013 of the active pen 101, and the second cover layer 113 is attached to the inner pen tube 1012 of the active pen 101 through the elastic layer 114.

[0062] The first cover layer 111 covers the touch electrode layer 1121 and is used to protect the touch layer 112. For example, the first cover layer 111 can provide waterproof and dustproof protection for the touch layer 112.

[0063] For example, the first cover layer 111 is provided to facilitate installation inside the active pen. For instance, due to limitations such as the function of the touch layer, the surface of the touch layer may be a non-smooth surface. In this case, the side of the first cover layer 111 that contacts the housing 1013 can be set as a smooth surface, thereby facilitating a tight fit with the housing 1013 to accurately detect the user's touch in the corresponding area of ​​the capacitive film.

[0064] The touch layer 112 forms a capacitive structure, and the user's touch on the active pen is detected by detecting the capacitance signal of this structure. In some examples, multiple touch electrodes may be distributed in the touch layer 112, and these multiple touch electrodes can be various forms such as planar electrodes and strip electrodes. Optionally, the touch electrodes can form a self-capacitive structure with the ground terminal in the active pen, and the user's touch is detected by detecting the self-capacitive signal of the touch electrodes.

[0065] For example, the touch layer 112 may include a multi-layer structure stacked together, such as a three-layer structure. The touch layer 112 may include a touch electrode layer 1121, a first substrate 1122 and a wiring layer 1123 stacked together. The touch electrode layer 1121 and the wiring layer 1123 are insulated from each other through the first substrate 1122. The wiring layer 1123 is used to realize the wiring distribution of the touch layer 112.

[0066] The thickness of the touch electrode layer 1121 is between 22 μm and 30 μm, the thickness of the first substrate 1122 is between 15 μm and 25 μm, and the thickness of the wiring layer 1123 is between 22 μm and 30 μm. By setting the thicknesses of the touch electrode layer 1121, the first substrate 1122, and the wiring layer 1123 to meet the above-mentioned ranges, the touch layer can have a suitable thickness, which helps to reduce the thickness of the capacitor film, thereby reducing the space occupied by the capacitor film in the active pen. In addition, the setting of this touch layer can also ensure that the active pen has better detection performance for user touch.

[0067] The thickness of the touch electrode layer 1121 is not limited in this embodiment. For example, the thickness of the touch electrode layer 1121 may be 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, or any value within the above range, such as 22μm.

[0068] For example, the thickness of the first substrate 1122 may be 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, or any value within the above range, such as 25μm.

[0069] The thickness of the wiring layer 1123 is not limited in this embodiment. For example, the thickness of the wiring layer 1123 can be 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, or any value within the above range, such as 22μm.

[0070] Optionally, the material of the first substrate 1122 may include, for example, polyimide (PI), and the materials of the touch electrode layer 1121 and the wiring layer 1123 may include, for example, metal materials such as copper.

[0071] The second cover layer 113 covers the wiring layer 1123 and is attached to the inner pen tube 1012 of the active pen 101 via the elastic layer 114. The second cover layer 113 can be used to protect the touch layer 112. For example, the second cover layer 113 can provide waterproof and dustproof protection for the touch layer 112.

[0072] Optionally, the first cover layer 111 and the second cover layer 113 can be black cover layers.

[0073] In some embodiments, the elastic layer 114 is used to change its thickness under external touch pressure, thereby providing a buffering effect for the external force and reducing the impact of the external force on the active pen. In addition, the elastic layer 114 can also reduce the gap between the capacitor film and the inner pen tube after the capacitor film is attached and installed, so that the capacitor film can make complete contact with the inner pen tube, which is beneficial to improving the stability of the capacitor film.

[0074] For example, the elastic layer 114 may include foam.

[0075] Through the technical solution of this application embodiment, a capacitor film is provided between the inner pen tube and the outer shell of the active pen. The capacitor film can effectively detect the user's grip on the active pen and can also provide more operating areas for the active pen, that is, to detect the user's touch, click, press and other operations on the outer shell, thereby expanding the function of the active pen, improving the overall performance of the active pen and the user's experience of using the active pen.

[0076] Figure 4 Another structural schematic diagram of the capacitor film provided in an embodiment of this application is shown.

[0077] like Figure 4 As shown, in Figure 3 Based on the film structure shown, the capacitor film 110 further includes an electromagnetic shielding layer 115, which is disposed between the second cover layer 113 and the inner pen tube 1012 of the active pen 101. The electromagnetic shielding layer 115 is used to shield electromagnetic interference and reduce mutual interference between the touch signal of the active pen 101 and other signals. In some embodiments, the electromagnetic shielding layer 115 may be provided with a ground potential line.

[0078] In some embodiments, the thickness of the electromagnetic shielding layer 115 is between 22 μm and 25 μm. Optionally, the thickness of the electromagnetic shielding layer 115 can be 22 μm, 23 μm, 24 μm, 25 μm, or any value within the above range. The thickness of the electromagnetic shielding layer 115 satisfies the above range, allowing it to have a suitable thickness and reducing the thickness of the capacitor film 110.

[0079] In some embodiments, an electromagnetic shielding layer 115 is disposed between a second cover layer 113 and an elastic layer 114. A first adhesive layer 116 is disposed between the electromagnetic shielding layer 115 and the elastic layer 114, and a second adhesive layer 117 is disposed between the elastic layer 114 and the inner pen tube 1012 of the active pen 101. The thickness of the first adhesive layer 116 is between 25 μm and 50 μm, and the thickness of the second adhesive layer 117 is between 25 μm and 50 μm. The first adhesive layer 116 is used to bond the electromagnetic shielding layer 115 and the elastic layer 114, and the second adhesive layer 117 is used to bond the elastic layer 114 and the inner pen tube 1012 of the active pen 101.

[0080] In some embodiments, the thickness of the first adhesive layer 116 can be 22 μm, 23 μm, 24 μm, 25 μm, or any value within the aforementioned range. The thickness of the second adhesive layer 117 can be 22 μm, 23 μm, 24 μm, 25 μm, or any value within the aforementioned range. The thicknesses of the first adhesive layer 116 and the second adhesive layer 117 satisfying the aforementioned ranges can reduce the thickness of the capacitor film 110 and reduce the space occupied by the capacitor film 110 in the active pen 101.

[0081] In some embodiments, such as Figure 4 As shown, the first cover layer 111 includes a first polymer layer 1111 and a fourth adhesive layer 1112 stacked together; the thickness of the first polymer layer 1111 is between 12.5 μm and 15 μm, and the thickness of the fourth adhesive layer 1112 is between 15 μm and 20 μm. The fourth adhesive layer 1112 is used to bond the touch layer 112 and the first polymer layer 1111.

[0082] For example, the first polymer layer 1111 may be a non-conductive layer. For instance, the material of the first polymer layer 1111 may be any of the following: polyimide (PI), polyhexene (PE), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), or polyvinyl chloride (PVC), etc. The material of the first cover layer 111 may be chosen as needed.

[0083] In some embodiments, the thickness of the fourth adhesive layer 1112 can be 22μm, 23μm, 24μm, 25μm, or any value within the above range. The thickness of the fourth adhesive layer 1112 within the above range can reduce the thickness of the capacitor film 110 and reduce the space occupied by the capacitor film 110 in the active pen 101.

[0084] In some embodiments, such as Figure 4As shown, the second cover layer 113 includes a second polymer layer 1131 and a fifth adhesive layer 1132 stacked together; the thickness of the second polymer layer 1131 is between 12.5 μm and 15 μm, and the thickness of the fifth adhesive layer 1132 is between 15 μm and 20 μm. The second polymer layer 1131 can be used to protect the touch layer 112, and the fifth adhesive layer 1132 is used to bond the touch layer 112 and the second polymer layer 1131.

[0085] For example, the second polymer layer 1131 may be a non-conductive layer. For instance, the material of the second polymer layer 1131 may be any of the following: polyimide (PI), polyhexene (PE), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), or polyvinyl chloride (PVC), etc. The material of the second polymer layer 1131 may be selected as needed.

[0086] In some embodiments, the thickness of the fifth adhesive layer 1132 can be 22μm, 23μm, 24μm, 25μm, or any value within the above range. The thickness of the fifth adhesive layer 1132 within the above range can reduce the thickness of the capacitor film 110 and reduce the space occupied by the capacitor film 110 in the active pen 101.

[0087] For example, the first adhesive layer 116 described above may include a double-sided coated adhesive, such as acrylic adhesive, rubber, or other types of adhesives. The second adhesive layer 117 may include a double-sided mesh adhesive. The fourth adhesive layer 1112 and the fifth adhesive layer 1132 may include any one or more of the following materials: polyimide (PI), polyester (PET), thermosetting resin coating adhesive, epoxy resin (EP) coating adhesive, etc.

[0088] For example, the electromagnetic shielding layer 115, elastic layer 114, first adhesive layer 116, and second adhesive layer 117 described above may be disposed only in a portion of the capacitor film.

[0089] The above text Figure 3 and Figure 4 The capacitive film in the illustrated embodiment may include two metal layers, namely a touch electrode layer 1121 and a wiring layer 1123, for realizing user touch detection. This application embodiment also provides a capacitive film that may include three metal layers; in this case, the capacitive film can simultaneously realize touch detection and pressure detection.

[0090] Figure 5 A schematic diagram of another capacitor film structure provided in an embodiment of this application is shown.

[0091] like Figure 5 As shown above, Figure 3Based on the illustrated membrane structure, the capacitive membrane 110 further includes a pressure-sensing layer 118, which can be disposed between the touch layer 112 and the second cover layer 113. For example, the pressure-sensing layer 118 can be disposed between the wiring layer 1123 and the second cover layer 113 in the touch layer 112. The pressure-sensing layer 118 can also be used to form a capacitor structure, detecting the user's pressure on the stylus by detecting the capacitance signal of this capacitor structure. In some examples, multiple pressure-sensing electrodes can be distributed in the pressure-sensing layer 118, and these electrodes can be in various forms such as block electrodes or strip electrodes. Optionally, the pressure-sensing electrodes can form a self-capacitive structure with the ground terminal in the stylus, and the user's pressure can be detected by detecting the self-capacitive signal of the pressure-sensing electrodes.

[0092] During the user's press, the pressure can squeeze the outer shell and the membrane layer in the capacitor diaphragm 110, thereby deforming the elastic layer 114. The inner pen tube of the active pen can be grounded to form the ground terminal of the active pen. When the elastic layer 114 deforms, the capacitance between the pressure sensing electrode in the pressure sensing layer 118 and the active pen changes. By detecting this change in capacitance signal, the user's pressure can be detected.

[0093] In some embodiments, such as Figure 5 As shown, the pressure sensing layer 118 includes a pressure sensing electrode layer 1182 and a second substrate 1181 stacked together. The pressure sensing electrode layer 1182 is connected to the wiring layer 1123 in the touch layer 112 through the second substrate 1181.

[0094] For example, the first substrate 1122 and the second substrate 1181 can be made of the same material, for example, both can be PI material. In an alternative example, the first substrate 1122 and the second substrate 1181 can also be made of other organic materials with better stability.

[0095] In some embodiments, the overall thickness of the pressure-sensing layer 118 is between 22 μm and 30 μm, wherein the thickness of the second substrate 1181 is between 12 μm and 15 μm, and the thickness of the pressure-sensing electrode layer 1182 is between 10 μm and 15 μm. This embodiment can reduce the thickness of the capacitor film 110 and reduce the space occupied by the capacitor film 110 in the active pen 101. For example, the thickness of the pressure-sensing layer 118 can be 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, or any value within the above range, such as 22 μm. The thickness of the second substrate can be 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, or any value within the above range, such as 12.5 μm.

[0096] In some embodiments, the pressure-sensing electrode layer 1182, the second substrate 1181, and the wiring layer 1123 form a double-sided circuit board 123, and the touch electrode layer 1121 and the first substrate 1122 form a single-sided circuit board 124. The double-sided circuit board 123 and the single-sided circuit board 124 are connected by a third adhesive layer 119, which is used to bond the single-sided circuit board 124 and the double-sided circuit board 123, thereby improving the structural stability of the active pen 101.

[0097] In this embodiment, the single-sided circuit board 124 can be fabricated by mechanical methods such as hot pressing, cold pressing, or rolling, directly rolling copper foil onto the surface of the first substrate 1122 near the touch electrode layer 1121. The double-sided circuit board 123 can also be fabricated by mechanical methods such as hot pressing, cold pressing, or rolling, directly rolling copper foil onto the two surfaces of the second substrate 1181 near the pressure sensing electrode layer 1182 and the wiring layer 1123, respectively. Optionally, the single-sided circuit board 124 and the double-sided circuit board 123 can be a single-sided adhesive-free rolled foil circuit board (or a single-sided adhesive-free rolled copper circuit board) and a double-sided adhesive-free rolled foil circuit board (or a double-sided adhesive-free rolled copper circuit board), respectively.

[0098] Optionally, the third adhesive layer 119 may include a double-sided coated polyimide material to reduce air gaps between the double-sided circuit board 123 and the single-sided circuit board 124, thereby ensuring bonding quality.

[0099] In some embodiments, the thickness of the third adhesive layer 119 is between 13 μm and 30 μm. Specifically, the thickness of the third adhesive layer 119 can be 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, or any value within the above range, such as 13 μm. The thickness of the third adhesive layer 119 satisfying the above range can reduce the thickness of the capacitor film 110 and reduce the space occupied by the capacitor film 110 in the active pen 101.

[0100] In some embodiments, the pressure-sensing electrode layer 1182 is used to compress the elastic layer 114 under the action of a user's press, so as to cause a change in the thickness of the elastic layer 114 and a change in the capacitance detected by the pressure-sensing electrode layer 1182.

[0101] Optionally, the thickness of the elastic layer 114 is between 50 μm and 150 μm. When the thickness of the elastic layer 114 is greater than or equal to 50 μm, the elastic layer 114 can have a suitable thickness and can have sufficient deformation under extrusion operation; when the thickness of the elastic layer 114 is less than or equal to 150 μm, the thickness of the elastic layer 114 can be reduced, thereby reducing the space occupied by the capacitor film 110 in the active pen 101.

[0102] For example, the thickness of the elastic layer 114 can be 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, or any value within the above range, such as 150μm.

[0103] For ease of description, in the embodiments of this application, unless otherwise specified, the capacitance signals are the capacitance signals corresponding to the touch layer 112 and the pressure sensing layer 118.

[0104] In some embodiments, the number of pressure-sensing electrodes in the pressure-sensing electrode layer 1182 is less than or equal to the number of touch electrodes in the touch electrode layer 1121. This allows for higher accuracy in touch detection range, while relatively lower accuracy in pressure detection range. While maintaining pressure detection performance, this simplifies the hardware and software implementation of pressure detection and improves the overall performance of the active pen. For example, the number of pressure-sensing electrodes in the pressure-sensing electrode layer 1182 can be 12, and the number of touch electrodes in the touch electrode layer 1121 can be 36. This embodiment of the application does not limit this.

[0105] Figure 6 This is a planar schematic diagram of the touch electrode layer in the capacitor film provided in an embodiment of this application.

[0106] like Figure 6 As shown, an electrode array can be distributed in the touch electrode layer 1121. As an example, each electrode in the electrode array can be a rectangular electrode, which can be referred to as an electrode pad. In other alternative embodiments, the shape of the electrodes in the electrode array can also be designed as rhombus or other shapes, and this application embodiment does not specifically limit this.

[0107] Each electrode in the electrode array can form a single plate of a capacitor, and the other plate of the capacitor can be the ground terminal of the active pen, for example, the inner pen tube of the active pen. When a user's finger touches the active pen 101, a driving voltage can be input to the electrode array, and then the voltage signal of the electrode array can be detected. The change in the voltage signal can reflect the change in the capacitance signal, thereby realizing the detection of the user's touch.

[0108] Optionally, the distribution of the electrode array in the pressure-sensing electrode layer 1182 can be consistent with... Figure 6 The illustrated embodiment is similar. Optionally, the area of ​​each electrode in the pressure-sensing electrode layer 1182 can be greater than [missing information - likely a number]. Figure 6 The area of ​​each electrode in the touch electrode layer 1121 is shown. Optionally, the number of electrodes in the pressure-sensing electrode layer 1182 may be less than [a certain value]. Figure 6 The number of electrodes in the touch electrode layer 1121 shown.

[0109] Similar to the touch detection process described above, when a user's finger presses on the active pen 101, a driving voltage can be input to the electrode array in the pressure sensing electrode layer 1182, and then the voltage signal of the electrode array can be detected. The change in the voltage signal can reflect the change in the capacitance signal, thereby realizing the detection of the user's pressure.

[0110] Figure 7 A three-dimensional schematic diagram of a capacitor film according to an embodiment of this application is shown.

[0111] like Figure 7 As shown, the capacitor film 110 may include a detection area 120 and an electrical connection area 121. The touch electrode layer 1121 in the detection area 120 may be provided with multiple touch electrodes, and the pressure sensing electrode layer 1182 may be provided with multiple pressure sensing electrodes. (The above text is incomplete and requires further context.) Figures 3 to 6 The solutions in the embodiments shown are all related to the detection area 120 in the capacitor film 110.

[0112] Figure 8 A planar schematic diagram of the electrical connection region in a capacitor film is shown.

[0113] like Figure 8 As shown, in the capacitor film 110, the electrical connection area 121 can be connected to a touch chip (Touch IC). The touch chip can be soldered to the main board of the active pen through the gold fingers (the area shown in the red box in the figure). The main board supplies power to the capacitor film through the gold fingers, and at the same time realizes the communication and interaction between the main controller and the touch chip through the GPIO interrupt signal and communication signal (such as IIC) of the gold fingers.

[0114] Combination Figure 7 and Figure 8 As shown, the electrical connection area 121 of the capacitor film 110 and the detection area 120 are not located on the same plane. Optionally, in some embodiments, the detection area 120 is wound up, and the electrical connection area 121 connected to the detection area 120 can be bent and disposed in the space formed by the winding of the detection area 120. Optionally, the electrical connection area 121 can be located in the axial section of the active pen 101, wherein the axial section of the active pen 101 can be a section parallel to the central axis of the active pen 101. The electrical connection area 121 is not attached to the outer shell of the active pen 101 or the inner pen tube of the active pen 101, but is located in the central axis region of the active pen 101, which is beneficial to protecting the touch chip on the electrical connection area 121. In some embodiments, the inner shell of the active pen 101 can be correspondingly disposed on both sides of the electrical connection area 121, thereby further protecting the touch chip.

[0115] Figure 9 and Figure 10 Two schematic cross-sectional views of the capacitor film provided in the embodiments of this application are shown.

[0116] like Figure 9 and Figure 10 As shown, the capacitor film 110 includes a detection area 120 and an electrical connection area 121. Figure 9 In the embodiment shown, the stacked structure of the capacitor film 110 in the detection area 120 can be referred to above. Figure 4 The relevant description of the illustrated embodiment. Figure 10 In the embodiment shown, the stacked structure of the capacitor film 110 in the detection area 120 can be referred to above. Figure 5 The relevant description of the illustrated embodiment is provided below. For the sake of brevity, the relevant scheme of the detection area 120 in the capacitor film 110 will not be described in detail here.

[0117] See Figure 9 The elastic layer 114 covers the detection area 120 but not the electrical connection area 121. If the capacitor film 110 also includes an electromagnetic shielding layer 115, this electromagnetic shielding layer 115 also covers the detection area 120 but not the electrical connection area 121. Correspondingly, the first adhesive layer 116 and the second adhesive layer 117 connecting the elastic layer 114 and the electromagnetic shielding layer 115 also cover the detection area 120 but not the electrical connection area 121. The elastic layer 114 is mainly used for sufficient contact between the detection area 120 in the capacitor film 110 and the inner pen tube of the active pen. The electrical connection area 121 does not need to contact the inner pen tube of the active pen, therefore this elastic layer is not required. The electromagnetic shielding layer 115 is mainly used to shield the electromagnetic interference signal of the detection area 120 in the capacitor film 110 and does not need to cover the electrical connection area 121.

[0118] In the electrical connection region 121, the capacitor film 110 further includes a reinforcing layer 122, which provides support and reinforcement for the electrical connection region 121. Figure 9 In the example shown, the reinforcing layer 122 can be attached to the second cover layer 113 via an adhesive layer 125. Alternatively, in some alternative embodiments, the reinforcing layer can also be attached to the first cover layer 111 via an adhesive layer. Optionally, adhesive layers, such as adhesive layers 125 and 126 shown in the figure, can be provided on both sides of the reinforcing layer 122 to facilitate the stability of the reinforcing layer 122 in the active pen.

[0119] In some embodiments, the material of the reinforcing layer 122 may include a steel sheet and an adhesive backing; for example, the material of the reinforcing layer may include a SUS304 steel sheet.

[0120] In some embodiments, the thickness of the reinforcing layer 122 is between 50 μm and 150 μm to achieve a better reinforcing effect.

[0121] See Figure 10 As shown, besides the elastic layer 114 covering the detection area 120 but not the electrical connection area 121, the second covering layer 113 also covers the detection area 120 but not the electrical connection area 121. The surface of the pressure sensing electrode layer 1182 in the pressure sensing layer 118 is covered with black ink 127, the thickness of which can be between 27.5 μm and 35 μm. By providing black ink 127, it is beneficial to prevent external foreign matter such as water and oxygen from entering the pressure sensing electrode layer, thereby improving the stability of the active pen 101.

[0122] Optionally, the thickness of the black ink 127 can be 27.5μm, 28.5μm, 29.5μm, 30.5μm, 31.5μm, 32.5μm, 33.5μm, 34.5μm, 35μm, or any value within the above range. For example, the thickness of the black ink 127 can be 27.5μm.

[0123] Optionally, such as Figure 10 As shown, in this embodiment, the reinforcing layer 122 can be attached to the first cover layer 111 via an adhesive layer 125. Optionally, adhesive layers can be provided on both sides of the reinforcing layer 122, such as adhesive layers 125 and 126 shown in the figure.

[0124] In some embodiments, the capacitive film 110 may be disposed in one-third to one-half of the area of ​​the active pen 101 near the pen tip, which is beneficial for the user to hold and operate, and improves the user experience.

[0125] This application also provides an active pen 101, which includes a housing 1013, an inner pen tube 1012, and a capacitor film 110 as described in any of the above embodiments, wherein the capacitor film 110 is disposed between the housing 1013 and the inner pen tube 1012.

[0126] In some embodiments, the outer wall of the outer casing 1013 is deformable when squeezed by the user, and the inner pen tube 1012 is resistant to deformation when squeezed by the user; the material of the outer casing 1013 includes a polymer or a plastic, and the material of the inner pen tube 1012 includes a metal material. Optionally, the thickness of the outer casing 1013 may be between 0.7 mm and 0.8 mm.

[0127] In this embodiment, the outer wall of the outer shell 1013 can deform when the user squeezes it, thereby causing the elastic layer 114 to change in thickness. This is beneficial for the elastic layer 114 to convert the squeezing pressure into a change in the distance between the finger and the touch electrode layer 1121, which is beneficial for detecting the change in capacitance value at the squeezing position. The inner pen tube 1012 can resist deformation when the user presses it, which can improve the deformation resistance of the active pen 101 and further improve the structural stability of the active pen 101.

[0128] In some embodiments, the outer casing 1013 may be made of an insulating material such as a polymer or plastic; for example, the outer casing may be made of polycarbonate. The inner pen tube 1012 may be made of metal.

[0129] In some embodiments, the thickness of the outer shell 1013 is between 0.7 mm and 0.8 mm. Specifically, the thickness of the outer shell 1013 can be 0.7 mm, 0.71 mm, 0.72 mm, 0.73 mm, 0.74 mm, 0.75 mm, 0.76 mm, 0.77 mm, 0.78 mm, 0.79 mm, 0.8 mm, or any value within the above range, which is beneficial for the outer shell 1013 to deform when squeezed by the user.

[0130] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A capacitive film for an active pen, characterized in that, The capacitive film, disposed between the inner pen tube and the outer shell of the active pen, comprises: a first covering layer, a touch layer, a second covering layer, and an elastic layer stacked together; The touch layer includes a touch electrode layer, a first substrate, and a wiring layer stacked together; the thickness of the touch electrode layer is between 22μm and 30μm, the thickness of the first substrate is between 15μm and 25μm, and the thickness of the wiring layer is between 22μm and 30μm. The first cover layer covers the touch electrode layer, the second cover layer covers the wiring layer, and the first cover layer is attached to the outer shell of the active pen, while the second cover layer is attached to the inner pen tube of the active pen through the elastic layer.

2. The capacitor film according to claim 1, characterized in that, The active pen also includes an electromagnetic shielding layer, which is disposed between the second cover layer and the inner pen tube of the active pen, and the thickness of the electromagnetic shielding layer is between 22μm and 25μm.

3. The capacitor film according to claim 2, characterized in that, The electromagnetic shielding layer is disposed between the second cover layer and the elastic layer. A first adhesive layer is disposed between the electromagnetic shielding layer and the elastic layer. A second adhesive layer is disposed between the elastic layer and the inner pen tube of the active pen. The thickness of the first adhesive layer is between 25 μm and 50 μm, and the thickness of the second adhesive layer is between 25 μm and 50 μm.

4. The capacitor film according to claim 1, characterized in that, It also includes a pressure-sensing layer disposed between the touch layer and the second cover layer; the pressure-sensing layer includes a pressure-sensing electrode layer and a second substrate stacked together, the pressure-sensing electrode layer being connected to the wiring layer in the touch layer, the thickness of the pressure-sensing layer being between 22μm and 30μm, and the thickness of the second substrate being between 12μm and 15μm.

5. The capacitor film according to claim 4, characterized in that, The pressure-sensing electrode layer, the second substrate, and the wiring layer form a double-sided circuit board, and the touch electrode layer and the first substrate form a single-sided circuit board. The double-sided circuit board and the single-sided circuit board are connected by a third adhesive layer, the thickness of which is between 13μm and 30μm.

6. The capacitor film according to claim 4, characterized in that, When a user presses on the outer shell of the active pen, the pressure-sensing electrode layer is used to squeeze the elastic layer under the user's pressure, so as to change the thickness of the elastic layer and the distance between the pressure-sensing electrode layer and the inner pen tube. The distance change is used to characterize the capacitance change detected by the pressure-sensing electrode layer. The thickness of the elastic layer is between 50 μm and 150 μm.

7. The capacitor film according to claim 4, characterized in that, The number of pressure-sensing electrodes in the pressure-sensing electrode layer is less than or equal to the number of touch electrodes in the touch electrode layer.

8. The capacitor film according to any one of claims 1 to 7, characterized in that, The first cover layer includes a first polymer layer and a fourth adhesive layer stacked together; the thickness of the first polymer layer is between 12.5 μm and 15 μm, and the thickness of the fourth adhesive layer is between 15 μm and 20 μm.

9. The capacitor film according to any one of claims 1 to 7, characterized in that, The second cover layer includes a second polymer layer and a fifth adhesive layer stacked together; the thickness of the second polymer layer is between 12.5 μm and 15 μm, and the thickness of the fifth adhesive layer is between 15 μm and 20 μm.

10. The capacitor film according to any one of claims 1 to 7, characterized in that, The capacitor film includes a detection area and an electrical connection area, wherein the elastic layer covers the detection area but does not cover the electrical connection area; in the electrical connection area, the capacitor film further includes a reinforcing layer, which is attached to the first covering layer or the second covering layer.

11. The capacitor film according to claim 10, characterized in that, The second cover layer covers the detection area but not the electrical connection area. The surface of the pressure sensing electrode layer in the pressure sensing layer located between the touch layer and the second cover layer is covered with black ink, and the thickness of the black ink is between 22.5 μm and 35 μm.

12. The capacitor film according to claim 10, characterized in that, The electrical connection area of ​​the capacitor film is provided with a touch chip. The electrical connection area is located in the axial section of the active pen. The inner shell of the active pen is provided on both sides of the electrical connection area.

13. The capacitor film according to any one of claims 1 to 7, characterized in that, The capacitor film is arranged in a ring around the outer shell of the active pen and the inner pen tube of the active pen. The outer wall of the outer shell can deform when the user presses it, and the inner pen tube can resist deformation when the user presses it.

14. The capacitor film according to any one of claims 1 to 7, characterized in that, The capacitor film is disposed in the 1 / 3 to 1 / 2 region of the active pen near the pen tip.

15. An active pen, characterized in that, include: The outer casing, the inner pen tube, and the capacitor film as described in any one of claims 1 to 14, wherein the capacitor film is disposed between the outer casing and the inner pen tube.

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