An electronic pen

Abstract

The present invention discloses an electronic pen, which comprises a metal pen tube, a conductive pen core and a circuit board. The conductive pen core and the circuit board are both arranged in the metal pen tube and are both insulated from the metal pen tube. The pen tip of the conductive pen core extends outward from the front end of the metal pen tube. The conductive pen core is electrically connected to the signal generating circuit of the circuit board as a signal transmitting antenna. The electronic pen uses the metal pen tube for signal shielding, which will effectively reduce the interference of the outside world on the signal sent by the electronic pen, thereby improving the signal strength; on the other hand, the pen core uses a conductive pen core to improve the overall conductivity of the pen core, which can further improve the signal strength when the conductive pen core is used as an antenna for signal transmission.

Description

Technical Field

[0001] The invention relates to the technical field of electronic pens, and in particular to the structural design of electronic pens. Background Art

[0002] With the development of electronic pen technology, users can use electronic pens to write on the screen of electronic devices to directly save and transmit electronic documents of the written content, such as signing electronically with the electronic pen. Moreover, the electronic pen can also be used to perform operations similar to a mouse, such as sending signals to electronic devices by operating the buttons of the electronic pen, so that the electronic device responds to the signal and performs function settings that match the operation.

[0003] When the user uses the electronic pen to perform mouse-like operations, the user hopes that the electronic pen's suspension height (i.e., the effective operating distance relative to the electronic device) is as large as possible, so that the user can still control the electronic device through the electronic pen when the user is at a certain distance from the electronic device, thereby improving the flexibility of use. However, since the electronic pen's signal strength that can be sensed by the electronic device becomes weaker as the electronic pen moves away from the electronic device, the electronic pen cannot sense the electronic device when the electronic pen moves away from the electronic device beyond a certain distance. Therefore, in order to make the electronic pen have a better suspension height, it is very necessary to provide a technical solution that can improve the signal strength of the signal sent by the electronic pen. Summary of the invention

[0004] An object of the embodiments of the present invention is to provide an electronic pen to improve the signal strength of a signal sent by the electronic pen.

[0005] According to a first aspect of the present invention, there is provided an electronic pen, comprising a metal pen tube, a conductive pen core and a circuit board, wherein the conductive pen core and the circuit board are both arranged in the metal pen tube and are both insulated from the metal pen tube, the pen tip of the conductive pen core extends outward from the front end of the metal pen tube, and the conductive pen core serves as a signal transmitting antenna and is electrically connected to the signal generating circuit of the circuit board.

[0006] Optionally, the electronic pen further comprises a spring, wherein the spring is sleeved on the conductive pen core, and the conductive pen core is electrically connected to the signal generating circuit via the spring.

[0007] Optionally, the conductive pen core is provided with a first insulating sleeve at the pen tip, and the conductive pen core is insulated from the metal pen tube by the first insulating sleeve.

[0008] Optionally, the thickness of the first insulating sleeve on the center line of the conductive pen core is less than or equal to 1 mm.

[0009] Optionally, the first insulating sleeve is provided with a through hole that allows the covered portion of the conductive pen core to communicate with the inner cavity of the metal pen tube.

[0010] Optionally, the conductive pen core includes a first conductive part and a second conductive part, one end of the first conductive part is located at the pen tip, the other end of the first conductive part is electrically connected to the second conductive part, and the first insulating sleeve is covered on the first conductive part.

[0011] Optionally, the other end of the first conductive part is electrically connected to the second conductive part via a threaded fitting structure.

[0012] Optionally, the electronic pen further comprises an insulating bracket installed in the metal pen tube, the second conductive part is located in the insulating bracket, and the conductive pen core is also insulated from the metal pen tube by the insulating bracket.

[0013] Optionally, an upper limit structure is formed between the second conductive portion and the insulating bracket, wherein the upper limit structure is used to limit an upper limit position of the pen core moving toward the front end of the pen tube.

[0014] Optionally, the first conductive part includes a head, a neck, a main body and a tail connected in sequence, wherein the neck shrinks inwardly relative to the head in the radial direction of the first conductive part, the main body expands outwardly relative to the neck in the radial direction, and the tail expands outwardly relative to the main body in the radial direction, the head and part of the neck are located at the pen tip, and the tail is electrically connected to the second conductive part at the other end of the first conductive part.

[0015] Optionally, the electronic pen also includes a pressure sensor, which is arranged on the circuit board, and the force-bearing surface of the pressure sensor faces the force-applying end of the conductive pen core, and the conductive pen core is provided with a second insulating sleeve at the force-applying end, wherein the force-applying end and the pen tip part are arranged at both ends of the conductive pen core.

[0016] Optionally, the pen tip of the conductive pen core has a step surface, the step surface is opposite to the end surface of the front end of the metal pen tube and has a gap, the step surface and the end surface of the front end form a lower limit structure, wherein the lower limit structure is used to limit the lower limit position of the pen core moving toward the pressure sensor.

[0017] One beneficial effect of the present invention is that the electronic pen of the embodiment of the present invention adopts a metal pen tube for signal shielding, which will effectively reduce external interference with the signal sent by the electronic pen, thereby improving the signal strength; on the other hand, the use of a conductive pen refill can enhance the overall conductivity of the pen refill, which can further improve the signal strength when the conductive pen refill is used as an antenna for signal transmission.

[0018] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0020] Figure 1 is a schematic cross-sectional structural diagram of an electronic pen according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the electronic pen after removing the pen tube;

[0022] Figure 3 for Figure 1 A perspective structural diagram of a first conductive part of the electronic pen and a first insulating sleeve covering the first conductive part;

[0023] Figure 4 for Figure 1 A schematic diagram of the appearance structure of a first conductive part of the electronic pen and a first insulating sleeve covering the first conductive part;

[0024] Figure 5 is a schematic diagram of a three-dimensional structure of an electronic pen without a pen tube according to another embodiment of the present invention;

[0025] Figure 6 for Figure 5 A schematic diagram of a local enlarged structure;

[0026] Figure 7 FIG. 4 is a schematic cross-sectional structural diagram of an electronic pen according to another embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1-pen tube; 11-end surface;

[0029] 2-pen core; 21-first insulating sleeve;

[0030] 211-through hole; 22-second insulating sleeve;

[0031] 23-first conductive part; 231-head;

[0032] 232-neck; 233-main body;

[0033] 234-tail portion; 24-second conductive portion;

[0034] 241-step surface; 25-pen tip;

[0035] 26-force-applying end; 251-step surface;

[0036] 3-main support; 31-step surface;

[0037] 32-mounting slot; 4-pressure sensor;

[0038] 41-stress surface; 5-circuit board;

[0039] 51-first circuit board; 52-second circuit board;

[0040] 6-adjusting mechanism; 61-adjusting block;

[0041] 62-transmission pair; 621-adjustment seat;

[0042] 622-adjusting screw; 6221-adjusting head;

[0043] 6222-screw part; 7-spring;

[0044] 8-buffer block; 9-sleeve;

[0045] 2_9-Mating surface. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] <Structure of the electronic pen>

[0052] An embodiment of the present invention provides an electronic pen for a user to write on an electronic device. The electronic pen includes a pen tube, a pen core, a pressure sensor and a circuit board, wherein the pen core, the pressure sensor and the circuit board are all installed in the pen tube, wherein the pen core can move relative to the pen tube with a set displacement along the axial direction of the pen core (or the length direction of the pen tube), and the pressure sensor and the circuit board are both fixedly installed relative to the pen tube.

[0053] The nib of the pen core extends outward from the front end of the pen tube so that writing can be performed through the nib.

[0054] The force-bearing surface of the pressure sensor faces the force-applying end of the pen core, and the force-applying end and the pen tip are respectively arranged at two ends of the pen core in the length direction of the pen tube.

[0055] When a user uses an electronic pen to write on the screen of an electronic device, pressure is applied to the pen core through the screen. Under the action of the pressure, the pen core will produce a small displacement toward the pressure sensor, so that the force-applying end of the pen core can transmit the pressure to the force-bearing surface of the pressure sensor. In this way, the pressure sensor can output an electrical signal representing the pressure value of the pressure.

[0056] The circuit board of the electronic pen has a processor such as an MCU, a signal generating circuit, etc. The signal output end of the pressure sensor is electrically connected to the corresponding connection end of the circuit board, and the pressure sensor outputs an electrical signal representing the pressure value to the processor through the connection end, so that the processor can obtain the current pressure value according to the electrical signal, and control the signal generating circuit to generate a signal carrying the pressure value, and the signal is sent to the electronic device used in conjunction with the electronic pen via the pen core (used as an antenna), wherein the electronic device has a signal receiving circuit adapted to the signal generating circuit, so that the electronic device can obtain the current pressure value by analyzing the received signal, and perform corresponding writing presentation according to the current pressure value.

[0057] In one embodiment, the pressure sensor may be directly soldered on the circuit board, that is, soldered on the corresponding connection terminal of the circuit board.

[0058] In one embodiment, the pressure sensor may also be electrically connected to a corresponding connection terminal of the circuit board through a wire, a flat cable, etc., for example, plugged into the corresponding connection terminal.

[0059] The electronic pen may be any type of electronic pen with electronic writing function, such as a capacitive pen, an electromagnetic pen, etc., and is not limited here.

[0060] According to one aspect of the present invention, a structural design for controlling the idle stroke of the electronic pen is proposed. Figure 1 and Figure 2 ,as well as Figure 5 and Figure 6 As shown, the electronic pen includes a pen tube 1, a pen core 2, a pressure sensor 4 and an adjusting mechanism 6. The pen core 2, the pressure sensor 4 and the adjusting mechanism 6 are all installed in the pen tube 1, and the pen tip 25 of the pen core 2 extends outward from the front end of the pen tube 1. The pressure sensor 4 is located between the pen core 2 and the adjusting mechanism 6 in the length direction of the pen tube 1, and the force-bearing surface 41 of the pressure sensor 4 faces the force-applying end 26 of the pen core 2. The adjusting mechanism 6 is configured to adjust the idle stroke between the force-bearing surface 41 and the force-applying end 26.

[0061] The above idle stroke indicates that in order for the pressure sensor to sense the pressure value applied to the pen tip 25, it is necessary to press the pen core 2 to move the minimum displacement toward the pressure sensor 4, that is, when the electronic pen is in a free state without being used, it is necessary to apply pressure to the pen tip 25 so that the force-applying end 26 of the pen core 2 moves the minimum displacement toward the pressure sensor 4, so that the pressure sensor can detect the pressure value of the applied pressure.

[0062] For electronic pens, the structural design must reserve an idle stroke to ensure that the pressure sensor has no output when the electronic pen is in a free state and not in use. However, if the idle stroke is too large, the pressure sensor will not be able to sense the small pressure applied, which will reduce the sensitivity of the pressure sensor. Therefore, it is very necessary to control the size of the idle stroke. However, in fact, due to the processing errors of the parts of the electronic pen, there are also assembly errors when assembling the electronic pen. These errors can neither be avoided nor monitored, which leads to the current electronic pens being in an uncontrollable state of idle stroke, resulting in the phenomenon of uneven quality of electronic pens.

[0063] The electronic pen of this embodiment solves this problem better by providing an adjustment mechanism 6. According to the structure of the electronic pen of this embodiment, when assembling and / or inspecting the electronic pen, the operator can control the idle stroke within a set range through the adjustment mechanism, which is conducive to forming a specification for constraining the idle stroke, so that the electronic pens leaving the factory have a uniform quality standard.

[0064] In addition, for the electronic pen of this embodiment, by providing an adjustment mechanism to adjust the idle stroke, the idle stroke can be reduced as much as possible, the sense of collapse during writing can be reduced, the sensitivity of the pressure sensor can be increased, and the writing experience can be improved.

[0065] The adjustment of the idle stroke by the adjustment mechanism can be performed in the semi-finished state of the electronic pen, wherein all functional components have been assembled in the semi-finished state, and the writing function of the electronic pen can be realized, but at least the pen tube 1 has not been assembled yet, so that the assembler can adjust the idle stroke by operating the adjustment mechanism 6. After completing the adjustment of the idle stroke, the assembler can further complete subsequent assembly, such as installing the pen tube 1, etc., to obtain a finished electronic pen.

[0066] <Example 1>

[0067] Figure 1 and Figure 2 The structure design of an electronic pen according to an embodiment of the present invention is shown.

[0068] In this embodiment, the electronic pen may include a main bracket 3 , which is disposed in the pen tube 1 and is used to mount various components of the electronic pen.

[0069] In this embodiment, the main support 3 may have a mounting groove 32, in which the pressure sensor 4 and the adjustment mechanism 6 are both mounted, and the refill 2 is mounted in the main support 3, wherein the tip 25 of the refill 2 is located outside the main support 3, and the force-applying end 26 of the refill 2 is located inside the main support 3, and the force-applying end 26 of the refill 2 extends into the mounting groove 32. This structure can position the pressure sensor 4 and the adjustment mechanism 6 in the pen tube 1 through the mounting groove 32, which is conducive to quickly and accurately completing the assembly of the pressure sensor 4, the adjustment mechanism 6, etc. in the pen tube 1.

[0070] In this embodiment, the electronic pen may further include a buffer block 8, which is disposed in the mounting groove 32 and is configured to limit the freedom of movement of the pressure sensor 4. The limiting function of the buffer block 8 is reflected in: on the one hand, the buffer block 8 provides the adjustment amount for the adjustment mechanism 6 to adjust the idle stroke by its own elastic deformation property; on the other hand, after the adjustment of the position of the pressure sensor 4 in the length direction of the pen tube 1 is completed by the adjustment mechanism 6, the pressure sensor 4 can be limited to the adjusted position, wherein the adjusted position is used to determine the idle stroke between the force-bearing surface of the pressure sensor 4 and the force-applying end 26 of the pen core 2.

[0071] In this embodiment, the buffer block 8 and the adjustment mechanism 6 can be arranged on both sides of the pressure sensor 4 in the length direction of the pen tube 1. During the adjustment process, the adjustment mechanism 6 can adjust the empty stroke by controlling the pressure sensor 4 to squeeze the buffer block 8 or release the buffer block 8.

[0072] The buffer block 8 can be, for example, a gasket made of a material capable of elastic deformation, such as a silicone pad or a rubber pad.

[0073] In this embodiment, the electronic pen may include a spring 7, which is sleeved on the pen core 2 and is configured to apply a reset force to the pen core 2 toward the front end of the pen tube 1. This means that when the pen core 2 is pressed, the reset force applied by the spring 7 needs to be overcome to push the pen core 2 toward the pressure sensor 4, so that the pressure applied by pressing the pen core 2 is transmitted to the force-bearing surface 41 of the pressure sensor 4 through the force-applying end 26 of the pen core 2, and when the applied pressure is released, the pen core 2 can be reset under the action of the reset force applied by the spring 7, and the idle travel reserved between the force-bearing surface 41 of the pressure sensor 4 and the force-applying end 26 can be quickly and reliably restored. In this embodiment, the position of the pen core 2 can be more accurately controlled by providing the spring 7.

[0074] Furthermore, the refill 2 is located in the main support 3, and an upper limit structure is formed between the refill 2 and the main support 3, wherein the upper limit structure is configured to define the idle stroke together with the adjustment mechanism 6. Here, the upper limit structure is used to limit the upper limit of the position of the refill 2 after it is reset under the action of the reset force applied by the spring 7, that is, to limit the upper limit of the position of the refill 2 moving toward the front end of the pen tube 1, so the upper limit structure will realize the restriction of the idle stroke together with the adjustment mechanism 6.

[0075] like Figure 1 and Figure 2 As shown, the upper limit structure is formed by the step surface 241 of the pen core 2 facing the pen tip 25 and the step surface 31 of the main support 3 facing the force application end 26. When the pen core 2 is reset, the step surface 241 of the pen core will abut against the step surface 31 of the main support 3, thereby limiting the pen core 2 to a position where the step surface 241 abuts against the step surface 31.

[0076] In this embodiment, Figure 1 and Figure 2 As shown, the electronic pen further includes a circuit board 5, the pressure sensor 4 is welded on the circuit board 5, and the adjustment mechanism 6 acts on the pressure sensor 4 through the circuit board 5 to adjust the idle stroke. This shows that the pressure sensor 4 and the circuit board 5 are an integrated structure, the adjustment mechanism 6 is in direct contact with the circuit board 5, and the positions of the circuit board 5 and the pressure sensor 4 are adjusted jointly by acting on the circuit board 5.

[0077] In this embodiment, the circuit board 5 may be a flexible printed circuit (FPC), and further, the electronic pen may further include a fixing member (not shown in the figure), which is arranged on the surface of the circuit board 5 that interacts with the adjustment mechanism 6. This means that the adjustment mechanism 6 is in direct contact with the fixing member, and the fixing member can effectively protect the circuit board 5 from damage.

[0078] The fixing piece may be a steel sheet, or may be made of other materials that are not easily deformed.

[0079] The fixing member should be insulated from the circuit board 5 . For example, the insulation can be achieved directly through the insulating substrate of the circuit board 5 . For another example, a fixing member made of an insulating material can also be used.

[0080] In this embodiment, the circuit board 5 may further include a first circuit board 51 and a second circuit board 52 connected to each other, the pressure sensor 4 is welded on the first circuit board 51, and the first circuit board 51 and the second circuit board 52 may be arranged on both sides of the adjustment mechanism 6 in the length direction of the pen tube 1. This structure can effectively utilize the larger installation space of the electronic pen in the length direction of the pen tube 1 and improve the compactness of the structural design.

[0081] The above first circuit board 51 is mainly used for welding the pressure sensor 4, and the second circuit board 52 is used to provide other functional circuits of the electronic pen, for example, other functional circuits include a processor, a signal generating circuit, a key circuit, etc., wherein the pressure sensor 4, the signal generating circuit, and the key circuit are all connected to the processor.

[0082] In one example, the first circuit board 51 and the second circuit board 52 are arranged orthogonally, for example, the first circuit board 51 is arranged perpendicular to the length direction of the pen tube 1 so that the force-bearing surface 41 of the pressure sensor 4 faces the force-applying end 26 of the pen core 2, and the second circuit board 52 is arranged parallel to the length direction of the pen tube 1. The reverse is also possible.

[0083] In one example, the circuit board 5 is a flexible circuit board, and the first circuit board 51 and the second circuit board 52 can be directly connected by the wiring of the flexible circuit board itself. That is, in this example, the circuit board 5 is a whole circuit board, but the circuit board 5 is bent to form a first circuit board 51 located on one side of the adjustment mechanism 6 and a second circuit board 52 located on the other side of the adjustment mechanism 6.

[0084] In an example, the first circuit board 51 and the second circuit board 52 may be connected to each other by a wire or a flat cable.

[0085] In one example, the circuit board 5 is a flexible circuit board, and the electronic pen can be provided with two fixing parts, one fixing part is provided on the surface of the first circuit board 51 interacting with the adjustment mechanism 6, and the other fixing part is provided on the surface of the second circuit board 52 to fix and protect the second circuit board 52.

[0086] In this embodiment, Figure 1 and Figure 2As shown, the adjustment mechanism 6 can be an adjustment block 61, which is a standard part similar to a standard weight and plays a measuring role, specifically, size measurement. The adjustment block 61 is provided with a mark for identifying the size of the adjustment block in the length direction of the pen tube 1 (referred to as thickness in the following example). The mark can be in any form as long as it can distinguish adjustment blocks of different sizes, and there is no limitation here.

[0087] In one example, the mark may be a specific thickness dimension value.

[0088] In an example, the mark may also be a color representing a thickness dimension value, for example, adjustment blocks of different sizes have different colors.

[0089] In one example, the mark can also be a number indicating the thickness dimension value. For example, there are 6 sizes of adjustment blocks in total, and these adjustment blocks are numbered from 1 to 6. The larger the number, the larger the thickness dimension. The above-mentioned thickness dimension is the distance dimension of the adjustment block in the length direction of the pen tube 1. Of course, it can also be described by width dimension, height dimension, etc.

[0090] In this embodiment, the principle of adjusting the idle stroke by the adjustment block 61 is that the selected adjustment block can ensure that the electronic pen does not output a pressure signal when it is not under force, thereby avoiding water leakage. After being under force, the pen core of the electronic pen only needs to move a minimum displacement to output a pressure signal to improve the sensitivity of the electronic pen. The steps of adjusting the idle stroke by using the adjustment block 61 may include:

[0091] Step 1: Select the adjustment block 61 of size class j j Adjust the idle stroke to detect whether the electronic pen is leaking. If it is leaking, execute step 2. If it is not leaking, execute step 3. In this embodiment, the adjustment block 61 j Represents an adjustment block with size level j, where j is a natural number from 1 to M, where M represents the highest size level and 1 represents the lowest size level. In the operation of adjusting the idle stroke, j can be any value from 1 to M and is not limited here.

[0092] Water leakage refers to the situation where handwriting information appears on the screen of the electronic device when the electronic pen is brought close to the screen of the electronic device (at this time, the screen does not apply pressure to the pen tip 25) to write.

[0093] Waterproof means that the electronic pen will not output a pressure signal when no force is applied, that is, when the electronic pen is brought close to the screen of an electronic device for writing, no handwriting information will appear on the screen of the electronic device.

[0094] In this embodiment, the lowest size level adjustment block 61 1Generally, it will not cause the electronic pen to leak water. Here, a set of adjusting blocks can be designed to have a relatively large size level range so that a set of adjusting blocks can meet the adjustment requirements of all electronic pens. In addition, multiple electronic pens can also be used for testing to design appropriate adjusting blocks with the lowest size level and the highest size level, thereby improving the efficiency of adjusting the idle stroke of the electronic pen.

[0095] Step 2: If the electronic pen leaks water, replace the adjusting block 61 with the next smaller size level. j-1 Adjust the idle stroke and check whether the electronic pen leaks water. If it does not leak water, determine to use this adjusting block 61. j-1 Limit the idle stroke of the electronic pen to complete the adjustment of the idle stroke. If it leaks water, continue to replace the adjusting block 61 with the next smaller size level. j-2 Adjust the idle stroke and check whether the electronic pen leaks water, and so on, to select a suitable adjusting block 61.

[0096] Step 3: If the electronic pen does not leak water and j = M, that is, the adjusting block 61 j is the adjusting block 61 with the highest size level M , then determine to use this adjusting block 61. j Limit the idle stroke of the electronic pen to complete the adjustment of the idle stroke. If the electronic pen does not leak water and j < M, then replace the adjusting block 61 with the previous larger size level. j+1 Adjust the idle stroke and check whether the electronic pen leaks water. If the adjusting block 61 j+1 leaks water, then determine to use the adjusting block 61. j Limit the idle stroke of the electronic pen to complete the adjustment of the idle stroke. If the adjusting block 61 j+1 does not leak water, then continue to replace the adjusting block 61 with the previous larger size level. j+2 Adjust the idle stroke and check whether the electronic pen leaks water, and so on, to select a suitable adjusting block 61.

[0097] According to the above steps, in this embodiment, the standard for selecting the adjusting block 61 is that the selected adjusting block 61 makes the electronic pen not leak water and the adjusting block 61 of the previous size level makes the electronic pen leak water. In this way, the idle stroke can be reduced as much as possible and the idle stroke can be limited within the set range.

[0098] In practical applications, the adjustment of the idle stroke can start from selecting the adjusting block with the highest size level, or it can also start from selecting the adjusting block with the lowest size level. In addition, since the consistency of the same batch of parts is relatively good, after trial-assembling several pens, the range of the size level of the suitable adjusting block 61 can be judged. In this way, an adjusting block of a size level can be selected from this range to start the water leakage detection. For example, from the adjusting block 61 M-2Start water leakage detection to improve the efficiency of adjusting the idle stroke through the adjustment block 61.

[0099] Further, based on the adjustment mechanism using the adjustment block 61 of the present embodiment, the embodiment of the present invention provides an idle stroke adjustment system, which includes an electronic pen having an adjustment block 61, an electronic device compatible with the electronic pen, and a group of adjustment blocks 61, wherein the group of adjustment blocks 61 includes a plurality of adjustment blocks 61 with different thicknesses, and each adjustment block 61 is marked with a corresponding size mark. The adjustment block 61 used to limit the idle stroke in the electronic pen is an adjustment block 61 selected from the group of adjustment blocks 61, wherein the selected adjustment block 61 makes the electronic pen (specifically the pen tip 25 of the electronic pen) not output a pressure signal in a non-stressed state and thus does not leave handwriting information on the electronic device, that is, the electronic pen does not leak, and the adjustment block 61 of the upper thickness level of the selected adjustment block 61 makes the electronic pen appear handwriting information on the electronic device in a non-stressed state, that is, there is a water leakage phenomenon.

[0100] <Example 2>

[0101] Figure 5 and Figure 6 The structure design of an electronic pen according to another embodiment of the present invention is shown.

[0102] The main difference between this embodiment and the above-mentioned embodiment 1 is that the adjustment mechanism 6 is implemented by a transmission pair 62 .

[0103] The transmission pair 62 may be a screw-nut transmission pair, and the transmission pair 62 may include an adjustment seat 621 and an adjustment screw 622, the adjustment seat 621 is fixedly installed in the pen tube 1, and the adjustment screw 622 includes an adjustment head 6221 and a screw portion 6222 connected to the adjustment head 6221, wherein the screw portion 6222 has an external thread, and the adjustment seat 621 has an internal thread that matches the external thread of the screw portion 6222, and the adjustment screw 622 is threadedly connected to the adjustment seat 621 through the screw portion 6222, and the screw portion 6222 of the adjustment screw 622 extends outward from the side of the adjustment seat 621 facing the pressure sensor 4, and the pressure sensor 4 is supported on the screw. The adjusting head 6221 of the adjusting screw 622 is located on the side of the adjusting seat 621 facing away from the pressure sensor 4, that is, the adjusting head 6221 and the end of the screw 6222 are arranged on both sides of the adjusting seat 621 in the length direction of the pen tube 1. In this way, by rotating the adjusting head 6221 of the adjusting screw 622 on the side of the adjusting seat 621 facing away from the pressure sensor 4, the length of the screw 6222 extending outward from the adjusting seat 621 can be controlled, thereby realizing the adjustment of the idle stroke between the force-bearing surface 41 of the pressure sensor 4 and the force-applying end 26 of the pen core 2.

[0104] In this embodiment, the adjustment seat 621 can be fixedly installed in the installation groove 32 of the main bracket 3, and the adjustment head 6221 of the adjustment screw 622 is located outside the installation groove 32 to facilitate the rotation of the adjustment screw 622 to adjust the idle stroke.

[0105] In this embodiment, other structural designs of the electronic pen can refer to the above embodiment 1 and will not be described in detail here.

[0106] In this embodiment, the steps of adjusting the idle stroke through the transmission pair 62 may include:

[0107] Step 1: When the electronic pen is in a semi-finished state, rotate the adjusting screw 622 to the initial position, wherein the initial position is the position where the screw portion 6222 of the adjusting screw 622 extends outward the longest from the adjusting seat 621. At this time, the adjusting head 6221 of the adjusting screw 622 abuts against the adjusting seat 621 on the side of the adjusting seat 621 that is away from the pressure sensor 4, and cannot rotate in a direction that causes the screw portion 6222 to further extend outward relative to the adjusting seat 621, and can only rotate in a direction that causes the screw portion 6222 to retract inward relative to the adjusting seat 621, wherein during the process of the screw portion 6222 retracting inward relative to the adjusting seat 621, the end of the screw portion 6222 moves in a direction gradually approaching the adjusting seat 621.

[0108] Step 2: When the adjusting screw 622 is at the initial position, detect whether the electronic pen is leaking. If not, determine that the adjustment of the idle stroke is completed, that is, the adjusted idle stroke is the idle stroke defined by the adjusting screw 622 at the initial position.

[0109] Step 3: If the adjusting screw 622 is in the initial position and the electronic pen is leaking, the adjusting head 6221 is rotated so that the screw part 6222 is retracted one step inward relative to the adjusting seat 621. At this time, it is detected whether the electronic pen is leaking. If it is not leaking, it is determined that the adjustment of the idle stroke is completed. If it is leaking, the adjusting head 6221 is further rotated so that the screw part 6222 is retracted one step inward relative to the adjusting seat 621, and the electronic pen is detected to be leaking. By analogy, the final adjustment position of the adjusting screw 622 is determined. That is, the standard for adjusting the adjusting screw 622 is: the electronic pen is not leaking when the adjusting screw 622 is in the final adjustment position, and leaking when the adjusting screw 622 is in the previous adjustment position. In this way, the idle stroke can be reduced as much as possible and limited to a set range.

[0110] In the above adjustment operation, the length of each adjustment step can be set as needed. For example, a step length can be set equal to a pitch of the screw portion 6222, etc. For another example, a step length can be set equal to the linear displacement of the screw portion 6222 caused by rotating the adjustment head 6221 half a circle or one circle.

[0111] <Example 3>

[0112] According to another aspect of the present invention, a structural design is proposed to protect the pressure sensor 4 from being damaged by the pen core 2.

[0113] In this embodiment, see Figures 1 to 4 As shown, the pen tip 25 of the pen core 2 may have a step surface 251, which is opposite to the end surface 11 of the front end of the pen tube 1 and has a gap, that is, when the pen core 2 is in a free state without force, there is a gap between the step surface 251 and the end surface 11, and the step surface 251 and the end surface 11 of the pen tube 1 form a lower limit structure, wherein the lower limit structure is configured to limit the lower limit position of the pen core 2 moving toward the pressure sensor 4, that is, when the pen core 2 moves toward the pressure sensor 4 to the lower limit position, the step surface 251 of the pen tip 25 abuts against the end surface 11, thereby preventing the pen core 2 from moving further toward the pressure sensor 4.

[0114] In this embodiment, by forming a lower limit structure between the pen tip 25 and the end surface 11 of the pen tube 1, the lower limit position of the movement of the pen core 2 toward the pressure sensor 4 can be limited, thereby effectively protecting the pressure sensor 4 from damage. In the case where the force-bearing surface 41 of the pressure sensor 4 has a maximum displacement amount of the pressure movement, the lower limit position should make the displacement amount of the force-bearing surface 41 less than the maximum displacement amount.

[0115] In addition, since the pen tube 1 can share part of the pressure when the pen core 2 moves toward the pressure sensor 4 to the lower limit position, it can reduce the pressure on the force-bearing surface 41 transmitted to the pressure sensor 4 through the force-applying end 26. In this way, when the pen core 2 is subjected to an instantaneous excessive pressure, for example, when the electronic pen falls and the pen tip 25 is subjected to a large pressure applied by the ground, the pressure sensor 4 can be effectively protected from being damaged by the instantaneous excessive pressure.

[0116] <Example 4>

[0117] According to the third aspect of the present invention, a structural design is proposed for improving the signal strength of signals sent to electronic devices, thereby obtaining a better suspension height.

[0118] In this embodiment, see Figures 1 to 4As shown, the pen tube 1 is a metal pen tube, the pen core 2 is a conductive pen core, the pen core 2 and the circuit board 5 are both insulated from the pen tube 1, and the pen core 2 serves as a signal transmitting antenna and is electrically connected to the signal generating circuit of the circuit board 5.

[0119] In this embodiment, on the one hand, the metal pen tube 1 can play a signal shielding role, which will effectively reduce the interference of the outside world on the signal output by the signal generating circuit, thereby improving the signal strength; on the other hand, the conductive pen core 2 can enhance the conductivity of the pen core 2, which can also improve the signal strength.

[0120] Through these two effects, the electronic pen of this embodiment can obtain a better suspension height by improving the signal strength, wherein the suspension height reflects the farthest distance at which the electronic pen can interact with the electronic device. When the distance between the electronic pen and the electronic device exceeds the farthest distance, the electronic device will not be able to accurately receive and identify the signal. The higher the signal strength of the signal sent by the electronic pen, the higher the suspension height will be.

[0121] Since the electronic pen of this embodiment has a good floating height, the user can operate the electronic pen within a certain range from the electronic device. At this time, the electronic device can also accurately receive the signal sent by the electronic pen and respond. For example, when the user operates the button of the electronic pen within a certain range, the electronic device can perform function settings that match the button operation.

[0122] In one example, the circuit board 5 includes a first circuit board 51 and a second circuit board 52. The signal generating circuit can be arranged on the second circuit board 52, but a connection point for electrically connecting the signal generating circuit to the pen core 2 is formed on the first circuit board 51 arranged adjacent to the pen core 2 to facilitate the electrical connection.

[0123] In this embodiment, the electronic pen may further include a spring 7, which is sleeved on the pen core 2, and the pen core 2 is electrically connected to the signal generating circuit through the spring 7. For example, one end of the spring 7 may be welded to the connection point of the signal generating circuit, and the other end of the spring 7 may be connected to the pen core 2, so as to achieve reliable connection between the spring 7, the signal generating circuit and the pen core 2. For another example, one end of the spring 7 may be welded to the connection point of the signal generating circuit, and the spring 7 may be sleeved on the pen core 2 to achieve electrical contact, that is, the spring 7 and the pen core 2 are electrically connected in a contact manner.

[0124] In this embodiment, the spring 7 can also be configured to apply a restoring force to the pen core 2 toward the front end of the pen tube 1 .

[0125] In this embodiment, the pen core 2 is provided with a first insulating sleeve 21 at the pen tip 25, and the pen core 2 is insulated from the pen tube 1 by the first insulating sleeve 21. The first insulating sleeve 21 is made of insulating rubber, for example.

[0126] In one example, the thickness of the first insulating sleeve 21 on the center line of the pen core 2 is less than or equal to 1 mm, that is, the thickness is the straight-line distance from the pen tip point of the pen tip 25 formed by the first insulating sleeve 21 to the conductor of the pen core 2 on the center line of the pen core 2. By limiting the thickness, it can be ensured that the signal strength transmitted through the pen core 2 is substantially not affected by the first insulating sleeve 21.

[0127] In this embodiment, the first insulating sleeve 21 is provided with a through hole 211 that allows the covered portion of the pen core 2 to communicate with the inner cavity of the pen tube 1. By providing the through hole 211, the resistance of installing the first insulating sleeve 21 can be reduced, and the installation efficiency can be improved.

[0128] In this embodiment, the refill 2 may further include a first conductive portion 23 and a second conductive portion 24, one end of the first conductive portion 23 is located at the pen tip 25, the other end of the first conductive portion 23 is electrically connected to the second conductive portion 24, and the first insulating sleeve 21 is coated on the first conductive portion 23. This segmented structure is conducive to reducing the difficulty of processing and improving the overall processing accuracy of the refill 2.

[0129] In this embodiment, the other end of the first conductive part 23 can be electrically connected to the second conductive part 24 through a threaded matching structure. For example, the other end of the first conductive part 23 has an external thread, and the second conductive part 24 is provided with a matching internal thread, and the assembler can screw the first conductive part 23 into the second conductive part 24 to complete the connection between the two.

[0130] In other embodiments, the first conductive portion 23 and the second conductive portion 24 may also be electrically connected via a clamping structure, a welding structure, etc., which is not limited here.

[0131] In this embodiment, the electronic pen may further include a main bracket 3 installed in the pen tube 1. The main bracket 3 is an insulating bracket. The second conductive part 24 is located in the insulating bracket. The pen core 2 is also insulated from the pen tube 1 through the insulating bracket.

[0132] In this embodiment, components such as the circuit board 5 can also be installed in the main bracket 3 to achieve an insulation setting with the pen tube 1.

[0133] In this embodiment, an upper limit structure may be formed between the second conductive portion 24 and the main bracket 3 , wherein the upper limit structure is configured to limit the upper limit position of the movement of the refill 2 toward the front end of the pen tube 1 .

[0134] like Figure 1 and Figure 2As shown, the upper limit structure is formed by the step surface 241 of the pen core 2 facing the pen tip 25 and the step surface 31 of the main support 3 facing the force application end 26. When the pen core 2 moves up and resets, the step surface 241 of the pen core will abut against the step surface 31 of the main support 3, thereby limiting the pen core 2 to the upper limit position where the step surface 241 abuts against the step surface 31.

[0135] In this embodiment, Figure 4 As shown, the first conductive part 23 may include a head 231, a neck 232, a main body 233 and a tail 234 which are connected in sequence, wherein the neck 232 shrinks inwardly relative to the head 231 in the radial direction of the first conductive part 23, the main body 233 expands outwardly relative to the neck 232 in the radial direction, and the tail 234 expands outwardly relative to the main body 233 in the radial direction, the head 231 and part of the neck 232 are located at the nib 25, and the tail 234 is electrically connected to the second conductive part 234 as the other end of the first conductive part 23. The first conductive part 23 adopts this structure, and the first insulating part 21 can be reliably positioned by the dimensional changes of the head 231, the neck 232 and the main body 233 in the radial direction of the first conductive part 23, and in addition, a reliable electrical connection with the second conductive part 24 can be achieved through the tail 234.

[0136] In this embodiment, the electronic pen further includes a pressure sensor 4, which is disposed on a circuit board 5, and a force-bearing surface 41 of the pressure sensor 4 faces a force-applying end 26 of the pen core 2, and the pen core 2 is provided with a second insulating sleeve 22 at the force-applying end 26, wherein the force-applying end 26 and the pen tip 25 are respectively provided at two ends of the pen core 2. In this embodiment, the second insulating sleeve 22 is provided to achieve an insulation setting between the pen core 2 and the pressure sensor 4, thereby avoiding a short circuit problem between the two.

[0137] In one example, the first conductor 23 and the second conductor 24 may be made of stainless steel SUS304 or brass H59.

[0138] In one example, the first insulating sleeve 21 and the second insulating sleeve 22 can be made of POM (plastic steel), PA66 (nylon), TPEE, TPU, etc.

[0139] <Example 5>

[0140] According to the fourth aspect of the present invention, a structural design is proposed that can reduce the shaking of the pen core while effectively controlling the ink gram force.

[0141] See also Figure 7As shown, in this embodiment, the electronic pen includes a pen tube 1, a sleeve 9, a pen core 2 and a pressure sensor 4. The sleeve 9, the pen core 2 and the pressure sensor 4 are all installed in the pen tube 1. The sleeve 9 is fixed relative to the pen tube 1. The pen core 2 passes through the sleeve 9 inside the pen tube 1 and slides with the sleeve 9 in the length direction of the pen tube 1. The sliding mating surfaces 2_9 are all metal surfaces, and the 2_9 mating surfaces include the outer surface of the mating part of the pen core 2 and the inner surface of the sleeve 9.

[0142] In one example, the sleeve 9 can be made entirely of metal.

[0143] In one example, the sleeve 9 may also include a sleeve body and a metal coating coated on the inner surface of the sleeve body, so as to form a sliding fitting mating surface 2_9 using the metal coating.

[0144] In one example, at least one section of the matching portion of the pen core 2 is made of metal.

[0145] In one example, there may be a hardness difference between the outer surface of the matching portion of the pen core 2 and the inner surface of the sleeve 9 to further improve the smoothness of the sliding fit.

[0146] In this embodiment, the pen core 2 has a pen tip 25 and a force-applying end 26 for applying pressure to the pressure sensor 4. The sleeve 9 is located between the pen tip 25 and the force-applying end 26. The pen tip 25 extends outward from the front end of the pen tube 1, and the force-applying end 26 faces the force-bearing surface 41 of the pressure sensor 4.

[0147] In this embodiment, since the electronic pen is provided with a sleeve 9 in the pen tube 1 to slide with the pen core 2, the electronic pen can effectively limit the movable clearance of the pen core 2 in its own radial direction through the sleeve 9, and improve the straightness of the movement of the pen core 2 in its own axial direction. At the same time, the matching surface 2_9 for forming the sliding fit is set as a metal surface, so that the matching surface 2_9 can have good hardness and smoothness characteristics, so that it can ensure that the pen core 2 and the sleeve 9 have a high consistency in coaxiality, and can effectively control the friction between the sleeve 9 and the pen core 2, so that the pen core 2 still has a small pressure loss during the pressure transmission process, and the control of the water output gram force is achieved.

[0148] The water gram force refers to the minimum pressure value formed between the electronic pen and the screen of the electronic device to achieve writing. The smaller the water gram force is, the better. The smaller the water gram force is, the higher the sensitivity of the electronic pen is. In the field of electronic pens, the water gram force is usually required to be controlled within 5-10g. According to this embodiment, by setting the sleeve 9 and the pen core 2 to slide together, the bilateral shaking amount can be limited to 0.01-0.03mm, which is a great improvement over the existing electronic pens; at the same time, the use of metal surface to achieve sliding cooperation will basically not affect the water gram force of the electronic pen, and the water gram force can still be controlled within the range of 5-10g.

[0149] In this embodiment, the electronic pen may further include a main bracket 3 fixedly installed in the pen tube 1, the above sleeve 9, pen core 2 and pressure sensor 4 are all installed in the main bracket 3, and the sleeve 9 is fixedly connected to the main bracket 3 to be fixedly arranged relative to the pen tube 1.

[0150] In one example, the main support 3 and the sleeve 9 can be formed separately, and the sleeve 9 can be fixedly installed at a set position of the main support 3. This can be achieved by, for example, interference fit, bonding, or other means to achieve a fixed connection between the sleeve 9 and the main support 3.

[0151] In one example, the sleeve 9 can also be used as an insert to mold the structure of the main bracket 3 to achieve a fixed connection between the two. In this example, the sleeve 9 can be molded first, and then the sleeve 9 is placed as an insert in the mold for injection molding the main bracket 3, so that a fixed connection between the two can be achieved.

[0152] In one example, the pen tube 1 may be a metal pen tube, the pen core 2 may be a conductive pen core, the electronic pen further comprises a circuit board 5, the pressure sensor 4 is welded on the circuit board 5, the pen core 2, the circuit board 4 and the sleeve 9 are all insulated from the pen tube 1, and the pen core 2 is electrically connected to the signal generating circuit of the circuit board 5 as a signal transmitting antenna. For example, referring to the above embodiment 4, the pen core 2 is electrically connected to the signal generating circuit of the circuit board 5 through the spring 7.

[0153] In this example, the pen core 1 may be provided with a first insulating sleeve 21 at the pen tip 25 , and the pen core 2 is insulated from the pen tube 1 by the first insulating sleeve 21 .

[0154] In this example, the pen core 1 may be provided with a second insulating sleeve 22 at the force applying end 26 .

[0155] In this example, both the sleeve 9 and the circuit board 5 can be insulated from the pen tube 1 by the main bracket 3 .

[0156] In an example, the refill 1 may include a first conductive part 23 and a second conductive part 24, the first end of the first conductive part 23 is located at the pen tip 25, the first end of the second conductive part 24 is located at the force applying end 26, the second end of the first conductive part 23 is electrically connected to the second end of the second conductive part 24, the refill 3 is provided with a first insulating sleeve 21 at the pen tip 25, and the sleeve 9 can be slidably matched with the first conductive part 23.

[0157] In one example, an upper limit structure may be formed between the second conductive part 24 and the main support 3, wherein the upper limit structure is set to an upper limit position for limiting the movement of the refill 2 toward the front end of the pen tube 1. In this example, the upper limit structure may be formed by a step surface 241 formed by the refill 2 facing the pen tip 25 and a step surface 31 formed by the main support 3 facing the force-applying end 26. In this example, the lower surface of the sleeve 9 facing the second conductive part 24 may be flush with the step surface 31, or may be retracted relative to the step surface 31 toward the front end of the pen tube 1.

[0158] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments, and each embodiment can be used alone or in combination as needed. For example, those skilled in the art can design an electronic pen by combining any two or more of Embodiments 1, 3, 4, and 5 as needed, or

[0159] Any two or more of Embodiment 2, Embodiment 3, Embodiment 4 and Embodiment 5 may be combined to design an electronic pen, etc., which is not limited here.

[0160] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An electronic pen, characterized in that: The electronic pen comprises a metal pen tube, a conductive pen core and a circuit board, wherein the conductive pen core and the circuit board are both arranged in the metal pen tube and are both insulated from the metal pen tube, the pen tip of the conductive pen core extends outward from the front end of the metal pen tube, and the conductive pen core is electrically connected to the signal generating circuit of the circuit board as a signal transmitting antenna; the electronic pen also comprises a pressure sensor and an adjusting mechanism, wherein the pressure sensor is located between the conductive pen core and the adjusting mechanism in the length direction of the metal pen tube, and the force-bearing surface of the pressure sensor faces the force-applying end of the conductive pen core, and the adjusting mechanism comprises a transmission pair, and the transmission pair The invention comprises an adjusting seat and an adjusting screw, wherein the adjusting seat is fixedly installed in the pen tube, the adjusting screw comprises an adjusting head and a screw part connected to the adjusting head, the adjusting screw is threadedly connected to the adjusting seat through the screw part, and the screw part of the adjusting screw extends outward from a side of the adjusting seat facing a pressure sensor, the pressure sensor is supported on the screw part, the adjusting head of the adjusting screw is located on a side of the adjusting seat facing away from the pressure sensor, and the adjusting mechanism is configured to control the length of the screw part extending outward from the adjusting seat through the adjusting head so as to adjust the idle stroke between the force-bearing surface and the force-applying end.

2. The electronic pen according to claim 1, characterized in that: The electronic pen further comprises a spring, wherein the spring is sleeved on the conductive pen core, and the conductive pen core is electrically connected to the signal generating circuit via the spring.

3. The electronic pen according to claim 1, characterized in that: The conductive pen core is provided with a first insulating sleeve at the pen tip, and the conductive pen core is insulated from the metal pen tube by the first insulating sleeve.

4. The electronic pen according to claim 3, characterized in that: The thickness of the first insulating sleeve on the center line of the conductive pen core is less than or equal to 1 mm.

5. The electronic pen according to claim 3, characterized in that: The first insulating sleeve is provided with a through hole that allows the covered portion of the conductive pen core to communicate with the inner cavity of the metal pen tube.

6. The electronic pen according to claim 3, characterized in that: The conductive pen core includes a first conductive part and a second conductive part, one end of the first conductive part is located at the pen tip, the other end of the first conductive part is electrically connected to the second conductive part, and the first insulating sleeve is covered on the first conductive part.

7. The electronic pen according to claim 6, characterized in that: The other end of the first conductive part is electrically connected to the second conductive part through a threaded fitting structure.

8. The electronic pen according to claim 6, characterized in that: The electronic pen further comprises an insulating bracket installed in the metal pen tube, the second conductive part is located in the insulating bracket, and the conductive pen core is also insulated from the metal pen tube by the insulating bracket.

9. The electronic pen according to claim 8, characterized in that: An upper limit structure is formed between the second conductive portion and the insulating bracket, wherein the upper limit structure is used to limit the upper limit position of the pen core moving toward the front end of the pen tube.

10. The electronic pen according to claim 6, characterized in that: The first conductive part includes a head part, a neck part, a main body part and a tail part which are connected in sequence, wherein the neck part contracts inwardly relative to the head part in the radial direction of the first conductive part, the main body part expands outwardly relative to the neck part in the radial direction, and the tail part expands outwardly relative to the main body part in the radial direction, the head part and part of the neck part are located at the pen tip, and the tail part is electrically connected to the second conductive part at the other end of the first conductive part.

11. The electronic pen according to claim 1, characterized in that: The pen tip of the conductive pen core has a step surface, which is opposite to the end surface of the front end of the metal pen tube and has a gap. The step surface and the end surface of the front end form a lower limit structure, wherein the lower limit structure is used to limit the lower limit position of the pen core moving toward the pressure sensor.

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