Refill pressure sensing assembly for active capacitance pen

Abstract

The invention relates to the field of active capacitance pens, in particular to a refill pressure sensing assembly for an active capacitance pen, which comprises a capacitance pen body, a pen point is mounted at one end of the capacitance pen body, and a control chip is mounted in the middle of the capacitance pen body. The capacitive pen further comprises an elastic clamping mechanism, a limiting mechanism, a conductive module, an elastic induction module, a signal processing module, a connection interface module and an installation process module, the elastic clamping mechanism is arranged on the inner wall of one end of the capacitive pen body, the limiting mechanism is arranged on the inner wall of the pen point, and the elastic clamping mechanism and the limiting mechanism are arranged in a separable clamping mode. The free ends of the multiple spiral springs correspond to the independent strain gauges, pressure distribution of different positions of the pen point can be detected at the same time, multi-dimensional pressure sensing is achieved, the silica gel pad is matched for absorbing impact force of the pen point, the deformation quantity of the spiral springs is controlled within the elastic limit, hard contact between the spiral springs and the supporting ring is avoided, and the service life of the pen point is prolonged. And fatigue damage of the spiral spring is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the field of active capacitive pens, in particular to a refill pressure sensing assembly for an active capacitive pen. BACKGROUND

[0002] An active capacitive pen is a high-precision input device that interacts with a touch screen through an internal circuit. Compared with a passive capacitive pen (which only simulates finger touch), it has advantages such as pressure sensing, tilt detection, and low latency, and is widely used in fields such as drawing, note-taking, and design. An active capacitive pen is a new type of digital handwriting tool that can be connected to devices such as mobile phones and tablets through Bluetooth or USB to write and draw on the screen. Compared with traditional pens, an active capacitive pen has higher sensitivity and a wider range of applications. An active capacitive pen has a built-in battery and control chip that can actively emit electromagnetic signals to interact with a touch screen. Compared with a passive capacitive pen, the tip of an active capacitive pen is usually thinner, providing higher precision and better writing experience.

[0003] However, the existing active capacitive pen has the following defects when in operation: the pressure sensing assembly of the active capacitive pen usually adopts a single elastic support structure, which can only detect the pressure in the vertical direction of the pen tip, making it difficult to capture the subtle pressure changes in the lateral direction or different positions of the pen tip during writing. Traditional pressure sensing assemblies rely on piezoresistive sensors, which have a low response frequency and cannot meet the needs of high-frequency pressure changes during fast writing or drawing. This can cause signal lag or loss. The signal processing module of the existing pressure sensing assembly has high power consumption, which requires additional battery capacity, resulting in an increase in the size of the capacitive pen or a reduction in its battery life. The elastic support structure of the traditional pressure sensing assembly directly contacts the pen tip, which can cause fatigue and deformation of the elastic structure due to the hard contact of the pen tip during long-term writing. The signal transmission interface of the pressure sensing assembly can be easily damaged due to the bending or vibration of the refill, resulting in poor contact. Therefore, there is a need for a solution that can perform multi-dimensional pressure detection, low-power signal processing, and structural reliability optimization. SUMMARY

[0004] The present application aims to provide a refill pressure sensing assembly for an active capacitive pen, which mainly solves the technical problems of low pressure sensing accuracy, poor dynamic response, short battery life, and fatigue in the prior art.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] A kind of refill pressure sensing assembly for active capacitive pen, including capacitive pen body, the tip is installed at one end of capacitive pen body, control chip is installed in the middle part of capacitive pen body, it further include elastic clamping mechanism, limiting mechanism, conductive module, elastic response module, signal processing module, connection interface module and installation process module, elastic clamping mechanism is arranged on the inner wall of one end of capacitive pen body, limiting mechanism is arranged on the inner wall of the tip, and elastic clamping mechanism and limiting mechanism are separable clamping arrangement, conductive module is arranged in the tip, and one end of conductive module extends to the inside of capacitive pen body, and is used to transmit electric signal, elastic response module is arranged on the inner wall of capacitive pen body, and the outside of elastic response module and the inside of conductive module are contact arrangement, and the center of elastic response module and one end of conductive module are contact connection arrangement, and elastic response module is used to convert the pressure change received by the tip into electric signal, signal processing module is arranged in the inside of capacitive pen body, signal processing module is close to the left side of elastic response module, and is used to amplify, filter and analog-digital conversion processing electric signal, and the pressure parameter signal for subsequent use is output, connection interface module is arranged in the inside of capacitive pen body, connection interface module is close to the right side of control chip, and connection interface module is used to realize the transmission of pressure parameter signal, installation process module is arranged between elastic response module and signal processing module, and elastic response module and signal processing module are connected through installation process module, for reducing signal transmission delay and noise interference.

[0007] The working principle and beneficial effects of the present application are as follows:

[0008] 1. Working principle: the elastic response module receives the pressure of the conductive module received by the tip, and then cooperates with the signal processing module to output the pressure parameter signal for use, thereby realizing the pressure sensing writing effect of the capacitive pen body. The connection interface module is used to realize the transmission of the pressure parameter signal. The elastic response module and the signal processing module are connected through the installation process module to reduce signal transmission delay and noise interference, facilitate multi-dimensional pressure detection, low-power processing and stable signal transmission, balance detection accuracy and device endurance, and are suitable for touch terminals such as tablet computers and electronic notebooks. In addition, the limiting mechanism is moved into the elastic clamping mechanism, and then the tip is rotated clockwise, which facilitates the tip to drive the limiting mechanism to extrude and clamp the elastic clamping mechanism, thereby limiting and fixing the position of the tip. Counterclockwise rotation of the tip allows the limiting mechanism to separate from the elastic clamping mechanism, so that the tip can be conveniently disassembled or installed.

[0009] 2. Beneficial effects:

[0010] (1) Through the free end of the several spiral springs corresponding to the independent strain gauge, the pressure distribution at different positions of the pen tip can be detected simultaneously to realize multi-dimensional pressure sensing. In addition, the impact force of the pen tip is absorbed by the silica gel pad to control the deformation of the spiral spring within the elastic limit, avoid the hard contact between the spiral spring and the support ring, and cause the fatigue damage of the spiral spring.

[0011] (2) The strain gauge array is connected through the Wheatstone bridge circuit, which is convenient for offsetting environmental noise through differential signal, ensuring the static pressure accuracy, and improving the dynamic response speed by more than 30%.

[0012] (3) Through the successive approximation type or Σ-Δ type architecture of the analog-to-digital converter, the working current is reduced while ensuring the conversion accuracy. In addition, the low-power power management unit controls the working power consumption of the analog-to-digital converter and the digital signal processor to prolong the battery life of the capacitive pen.

[0013] (4) Since the contact seat and the analog-to-digital converter are connected through flip-chip technology, replacing the traditional wire welding, reducing the influence of mechanical stress on signal transmission, the signal distortion rate is reduced by more than 50%, and the component life can reach more than 500,000 writing cycles.

[0014] (5) Through the flexible circuit board wiring, the bending resistance is strong, and can withstand more than 100,000 bends to avoid line breakage caused by pen core deformation.

[0015] (6) The pen tip drives the connecting block to move from the guide groove to the rotating groove, and then rotates the pen tip clockwise to make the connecting block move to the side of the clamping spring. In addition, the special-shaped groove makes the connecting block extrude the clamping spring when the clamping spring is deformed. When the clamping spring moves to the limiting groove, the clamping spring resets to make the clamping spring support and extrude the connecting block. In this way, the position of the connecting block is limited and fixed to ensure the stability of the pen tip. In addition, counterclockwise rotation of the pen tip makes the limiting block drive the limiting groove to extrude and compress the clamping spring, which facilitates the separation of the pen tip from the clamping spring and the limiting block, and through the guide groove, the limiting block is pulled out of the guide groove. In this way, the pen tip is conveniently disassembled or installed.

[0016] Preferably, the conductive module comprises a conductive rod, a support ring and a conductive touch rod, one end of the conductive rod is installed in the pen tip, the outer wall of one end of the conductive rod is fixedly connected with the support ring, and the conductive touch rod is installed at one end of the conductive rod. When the pen tip is installed at one end of the capacitive pen body, the pen tip drives the conductive rod to move, the conductive rod drives the support ring to move, and the conductive touch rod moves at the same time. When the support ring moves to contact with the several silica gel pads, the conductive touch rod is connected with the contact seat to supply power.

[0017] Preferably, the elastic sensing module comprises a contact seat, a resistance sensor, a spiral spring, a silica gel pad and a strain gauge, the contact seat is mounted on the inner wall of the capacitive pen body, a plurality of resistance sensors are embedded and mounted on the left side of the contact seat, the resistance sensors are arranged in a ring array at equal intervals, the right side of the resistance sensor is provided with a strain gauge, the right side of the strain gauge is provided with a spiral spring, and one end of the spiral spring is fixedly connected with a silica gel pad; the free end of the spiral spring is correspondingly provided with an independent strain gauge, which can cooperate with the resistance sensor to detect the pressure distribution at different positions of the pen tip at the same time, and multi-dimensional pressure sensing is realized.

[0018] Preferably, the signal processing module comprises an analog-to-digital converter, a digital signal processor and a low-power power management unit, the analog-to-digital converter is mounted in the capacitive pen body, the analog-to-digital converter is close to the left side of the elastic sensing module, the left side of the analog-to-digital converter is provided with a digital signal processor, and the low-power power management unit is mounted on the outer side of the digital signal processor in the capacitive pen body; the low-power power management unit is electrically connected with the main battery of the capacitive pen body, and the working power consumption of the analog-to-digital converter and the digital signal processor is controlled in cooperation with the low-power power management unit, thereby prolonging the endurance time of the capacitive pen.

[0019] Preferably, the connection interface module comprises a flexible circuit board, and the flexible circuit board is mounted on the right side of the control chip; in cooperation with the flexible circuit board, the bending resistance is strong, and more than 10,000 times of bending can be tolerated, so as to avoid line breakage caused by deformation of the pen core.

[0020] Preferably, the installation process module comprises a flip chip, the flip chip is installed between the contact seat and the signal processing module, and the contact seat and the signal processing module are connected through the flip chip process, so as to reduce signal transmission delay and noise interference.

[0021] Preferably, the elastic clamping mechanism comprises a fixed ring, a guide groove, a rotating groove and a clamping spring, the outer wall of the fixed ring is fixedly connected to the inner wall of one end of the capacitive pen body, two guide grooves are formed in the right side of the fixed ring, the two guide grooves are symmetrically arranged in a ring array, a rotating groove is formed in the inner wall of the fixed ring and communicates with the two guide grooves, and two clamping springs are fixedly connected to the inner wall of the rotating groove, the two clamping springs are symmetrically arranged in a ring array; the clamping spring is in L shape, the pen tip is rotated clockwise, the pen tip drives the limiting mechanism to move to one side of the clamping spring, the limiting mechanism extrudes the clamping spring by continuously rotating the pen tip, the clamping spring is deformed, when the clamping spring moves into the limiting mechanism, the clamping spring resets, the clamping spring extrudes the limiting mechanism to support the limiting mechanism, and the position of the limiting mechanism is limited and fixed.

[0022] Preferably, the limiting mechanism comprises support plates, connecting blocks, limiting grooves and special-shaped grooves, the support plates are provided with two, one end of each of the two support plates is fixedly connected to the inner wall of the pen tip, the two support plates are symmetrically arranged in an annular array, one end of the support plate is fixedly connected with the connecting block, the connecting block is provided with a limiting groove on the outer side, and the connecting block is provided with special-shaped grooves on the outer sides of both ends; the thickness of the connecting block is less than the thickness of the rotating groove, the height of the connecting block is adapted to the internal height of the rotating groove, and the width of the connecting block is adapted to the width of the guide groove, so that the connecting block can be moved into the rotating groove along the guide groove.

[0023] Preferably, the plurality of silica gel pads are in contact with one side of the conductive module; the silica gel pads absorb the impact force of the pen tip, the deformation amount of the coil spring is controlled within the elastic limit, and hard contact between the coil spring and the support ring is avoided to cause fatigue damage of the coil spring.

[0024] Preferably, the plurality of strain gauges form an array and are connected through a Wheatstone bridge circuit; and the strain gauge array is connected through the Wheatstone bridge circuit, so that environmental noise can be easily offset through a differential signal. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of a pen core pressure sensing assembly for an active capacitive pen.

[0026] Figure 2 It is a contact seat structure diagram of a pen core pressure sensing assembly for an active capacitive pen.

[0027] Figure 3 It is a coil spring structure diagram of a pen core pressure sensing assembly for an active capacitive pen.

[0028] Figure 4 It is a pen tip front view of a pen core pressure sensing assembly for an active capacitive pen.

[0029] Figure 5 It is a limiting mechanism structure diagram of a pen core pressure sensing assembly for an active capacitive pen.

[0030] Figure 6 It is an elastic clamping mechanism structure diagram of a pen core pressure sensing assembly for an active capacitive pen.

[0031] Figure 7 It is a module diagram of a pen core pressure sensing assembly for an active capacitive pen.

[0032] The reference signs in the drawings of the specification include:

[0033] 1, capacitive pen body; 2, pen tip;

[0034] 3, elastic clamping mechanism; 301, fixed ring; 302, guide slot; 303, rotating slot; 304, clamping elastic sheet;

[0035] 4, limiting mechanism; 401, support plate; 402, connecting block; 403, limiting slot; 404, special-shaped slot;

[0036] 5, conductive module; 501, conductive rod; 502, support ring; 503, conductive touch rod;

[0037] 6, elastic sensing module; 601, contact seat; 602, resistance sensor; 603, spiral spring; 604, silica gel pad; 605, strain gauge;

[0038] 7, signal processing module; 701, analog-to-digital converter; 702, digital signal processor; 703, low-power power management unit;

[0039] 8, connection interface module; 801, flexible circuit board;

[0040] 9, mounting process module; 901, flip chip;

[0041] 10, control chip. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] As Figures 1-7As shown, a pen core pressure sensing assembly for active capacitive pen, including a capacitive pen body 1, one end of the capacitive pen body 1 is provided with a pen tip 2, the middle of the capacitive pen body 1 is provided with a control chip 10, further comprising elastic clamping mechanism 3, limiting mechanism 4, conductive module 5, elastic sensing module 6, signal processing module 7, connection interface module 8 and installation process module 9, the inner wall of one end of the capacitive pen body 1 is provided with elastic clamping mechanism 3, the inner wall of the pen tip 2 is provided with limiting mechanism 4, and the elastic clamping mechanism 3 and the limiting mechanism 4 are detachably clamped, the elastic clamping mechanism 3 comprises a fixed ring 301, a guide groove 302, a rotating groove 303 and a clamping spring 304, the outer wall of the fixed ring 301 is fixedly connected to the inner wall of one end of the capacitive pen body 1, two guide grooves 302 are formed on the right side of the fixed ring 301, and the two guide grooves 302 are arranged in annular array, the inner wall of the fixed ring 301 is provided with a rotating groove 303 communicating with the two guide grooves 302, and the inner wall of the rotating groove 303 is fixedly connected with two clamping springs 304, the two clamping springs 304 are arranged in annular array, the limiting mechanism 4 comprises a support plate 401, a connecting block 402, a limiting groove 403 and a special-shaped groove 404, two support plates 401 are arranged, one end of the two support plates 401 is fixedly connected to the inner wall of the pen tip 2, and the two support plates 401 are arranged in annular array, the outer side of one end of the support plate 401 is fixedly connected with the connecting block 402, the limiting groove 403 is formed on the outer side of the connecting block 402, and the special-shaped groove 404 is arranged on both ends of the outer side of the connecting block 402, the pen tip 2 is pulled, the pen tip 2 drives the connecting block 402 to align with the guide groove 302, then the connecting block 402 is embedded into the guide groove 302, and moves from the guide groove 302 to the rotating groove 303, then the pen tip 2 is rotated clockwise, the pen tip 2 drives the connecting block 402 to move to one side of the clamping spring 304, the pen tip 2 is continuously rotated, the support plate 401 drives the special-shaped groove 404 on one side of the connecting block 402 to press the clamping spring 304, the clamping spring 304 is deformed, when the clamping spring 304 moves to the limiting groove 403, the clamping spring 304 resets, the clamping spring 304 supports and presses the connecting block 402, thereby limiting and fixing the position of the connecting block 402, ensuring the stability of the pen tip 2, the conductive module 5 is arranged in the pen tip 2, one end of the conductive module 5 extends into the capacitive pen body 1, and is used for transmitting electric signal, the conductive module 5 comprises a conductive rod 501, a support ring 502 and a conductive touch rod 503, one end of the conductive rod 501 is mounted in the pen tip 2, the outer wall of one end of the conductive rod 501 is fixedly connected with the support ring 502, and the conductive touch rod 503 is mounted at one end of the conductive rod 501, the pen tip 2 drives the conductive rod 501 to move, the conductive rod 501 drives the support ring 502 to move, and simultaneously drives the conductive touch rod 503 to move, when the support ring 502 moves to contact with the plurality of silica gel pads 604, at this time the conductive touch rod 503 is connected with the contact seat 601 to electrify, in addition, the pen tip 2 is counterclockwise rotated, the limiting block drives the limiting groove 403 to press and compress the clamping spring 304,The restriction block is separated from the clamping elastic sheet 304 by the pen nib 2. When the restriction block is rotated to be aligned with the guide groove 302, the pen nib 2 is pulled to the right of the body 1, so that the pen nib 2 pulls the restriction block out of the guide groove 302, thereby conveniently disassembling the pen nib 2.

[0044] The elastic sensing module 6 is arranged on the inner wall of the capacitive pen body 1, and the outer side of the elastic sensing module 6 is in contact with the inner side of the conductive module 5. The center of the elastic sensing module 6 is in contact with one end of the conductive module 5. The elastic sensing module 6 is used to convert the pressure change of the pen tip 2 into an electrical signal. The elastic sensing module 6 includes a contact seat 601, a resistance sensor 602, a spiral spring 603, a silica gel pad 604, and a strain gauge 605. The contact seat 601 is mounted on the inner wall of the capacitive pen body 1. A plurality of resistance sensors 602 are embedded and mounted on the left side of the contact seat 601. The resistance sensors 602 are arranged in a ring array at equal intervals. The resistance sensor 602 is mounted on the right side of the strain gauge 605. The strain gauges 605 form an array and are connected through a Wheatstone bridge circuit. The spiral spring 603 is mounted on the right side of the strain gauge 605. One end of the spiral spring 603 is fixedly connected with the silica gel pad 604. The right side of the silica gel pad 604 is in contact with one side of the conductive module 5. The signal processing module 7 is arranged inside the capacitive pen body 1. The signal processing module 7 is close to the left side of the elastic sensing module 6. The signal processing module 7 is used to amplify, filter, and analog-digital convert the electrical signal, and output a pressure parameter signal for subsequent use. The signal processing module 7 includes an analog-digital converter 701, a digital signal processor 702, and a low-power power management unit 703. The analog-digital converter 701 is mounted inside the capacitive pen body 1. The analog-digital converter 701 is close to the left side of the elastic sensing module 6. The digital signal processor 702 is mounted on the left side of the analog-digital converter 701. The low-power power management unit 703 is mounted on the outer side of the digital signal processor 702 inside the capacitive pen body 1. The installation process module 9 is arranged between the elastic sensing module 6 and the signal processing module 7. The elastic sensing module 6 and the signal processing module 7 are connected through the installation process module 9. The installation process module 9 includes a flip chip 901. The flip chip 901 is installed between the contact seat 601 and the signal processing module 7. The contact seat 601 and the signal processing module 7 are connected through the flip chip 901 process. The flip chip 901 is used to reduce signal transmission delay and noise interference. Through the free ends of the spiral springs 603 corresponding to the independent strain gauges 605, the resistance sensors 602 can detect the pressure distribution of the pen tip 2 at different positions at the same time, realize multi-dimensional pressure sensing, and control the deformation amount of the spiral spring 603 within the elastic limit by cooperating with the silica gel pad 604 to absorb the impact force of the pen tip 2. The spiral spring 603 is prevented from being in hard contact with the support ring 502, causing fatigue damage of the spiral spring 603. The strain gauge 605 array is connected through a Wheatstone bridge circuit, which is convenient for canceling environmental noise through differential signals. While ensuring the static pressure accuracy, the dynamic response speed is improved by more than 30%. The analog-digital converter 701 adopts a successive approximation type or Σ-Δ type architecture, which reduces the working current while ensuring the conversion accuracy. The low-power power management unit 703 controls the working power consumption of the analog-digital converter 701 and the digital signal processor 702, prolongs the endurance time of the capacitive pen,Since the contact seat 601 is connected with the analog-to-digital converter 701 through the flip chip 901 process instead of traditional wire welding, the influence of mechanical stress on signal transmission is reduced, the signal distortion rate is reduced by more than 50%, the service life of the assembly can reach more than 500,000 writing cycles, and then the received signal is processed by the control chip 10.

[0045] The connection interface module 8 is arranged in the body 1 of the capacitive pen, the connection interface module 8 is close to the right side of the control chip 10, and the connection interface module 8 is used for realizing transmission of the pressure parameter signal, the connection interface module 8 comprises a flexible circuit board 801, the flexible circuit board 801 is installed on the right side of the control chip 10, and the flexible circuit board 801 is matched with a wire harness, so that the bending resistance is high, more than 100,000 times of bending can be resisted, and line breakage caused by pen core deformation is avoided.

[0046] From the above, the specific embodiment of the present application is as follows: the pen tip 2 is pulled, so that the pen tip 2 drives the connecting block 402 to align with the guide groove 302, then the connecting block 402 is embedded into the guide groove 302 and moved from the inside of the guide groove 302 to the inside of the rotating groove 303, and then the pen tip 2 is rotated clockwise, so that the pen tip 2 drives the connecting block 402 to move to one side of the clamping spring 304, the pen tip 2 is continuously rotated, so that the support plate 401 drives the special-shaped groove 404 on one side of the connecting block 402 to extrude the clamping spring 304, so that the clamping spring 304 is deformed, when the clamping spring 304 moves to the inside of the limiting groove 403, the clamping spring 304 resets, so that the clamping spring 304 supports and extrudes the connecting block 402, so as to limit and fix the position of the connecting block 402, ensure the stability of the pen tip 2, at this time the pen tip 2 drives the conductive rod 501 to move, the conductive rod 501 drives the support ring 502 to move, and at the same time drives the conductive contact rod 503 to move, when the support ring 502 moves to contact the plurality of silica gel pads 604, at this time the conductive contact rod 503 is connected with the contact point seat 601 to be electrified, in the use process of the capacitance pen body 1, through the free end of the plurality of spiral springs 603 corresponding to the independent strain gauges 605, the pressure distribution at different positions of the pen tip 2 can be detected simultaneously by cooperating with the resistance sensor 602, multi-dimensional pressure sensing is realized, then the silica gel pad 604 is used to absorb the impact force of the pen tip 2, the deformation amount of the spiral spring 603 is controlled within the elastic limit, hard contact between the spiral spring 603 and the support ring 502 is avoided, fatigue damage of the spiral spring 603 is avoided, and the strain gauge 605 array is connected through a Wheatstone bridge circuit, so as to facilitate the cancellation of environmental noise through a differential signal, while ensuring the static pressure accuracy, the dynamic response speed is improved by more than 30%, through the successive approximation type or sigma-delta type architecture of the analog-to-digital converter 701, while ensuring the conversion accuracy, the working current is reduced, then the low-power power management unit 703 is used to control the working power consumption of the analog-to-digital converter 701 and the digital signal processor 702, the endurance time of the capacitance pen is prolonged, since the contact point seat 601 and the analog-to-digital converter 701 are connected through a flip chip 901 process, instead of traditional wire welding, the influence of mechanical stress on signal transmission is reduced, the signal distortion rate is reduced by more than 50%, and the component life can reach more than 500,000 writing cycles, then the received signal is processed by the control chip 10, then the flexible circuit board 801 is used to arrange the wires, so that the bending resistance is strong, and more than 100,000 bends can be borne, line breakage caused by the deformation of the pen core is avoided, in addition, the pen tip 2 is counterclockwise rotated, so that the limiting block drives the limiting groove 403 to extrude and compress the clamping spring 304, the pen tip 2 drives the limiting block to separate from the clamping spring 304 is facilitated, when the pen tip 2 drives the limiting block to rotate to align with the guide groove 302, the pen tip 2 is pulled to the right side of the capacitance pen body 1, so that the pen tip 2 drives the limiting block to pull out of the guide groove 302, so that the pen tip 2 is conveniently disassembled.

[0047] The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A pen core pressure sensing component for an active capacitive stylus, characterized in that: The invention comprises a capacitive pen body (1), a pen tip (2) is installed at one end of the capacitive pen body (1), a control chip (10) is installed in the middle of the capacitive pen body (1), and further comprises an elastic clamping mechanism (3), a limiting mechanism (4), a conductive module (5), an elastic sensing module (6), a signal processing module (7), a connection interface module (8) and an installation process module (9). The inner wall of one end of the capacitive pen body (1) is provided with an elastic clamping mechanism (3), the inner wall of the pen tip (2) is provided with a limiting mechanism (4), and the elastic clamping mechanism (3) and the limiting mechanism (4) are detachable clamping arrangements. The conductive module (5) is arranged inside the pen tip (2), one end of the conductive module (5) extends into the interior of the capacitive pen body (1) and is used to transmit electrical signals. The elastic sensing module (6) is arranged on the inner wall of the capacitive pen body (1), and the outer side of the elastic sensing module (6) is in contact with the inner side of the conductive module (5). The center of the sensing module (6) is connected to one end of the conductive module (5) as a contact, and the elastic sensing module (6) is used to convert the pressure change of the pen tip (2) into an electrical signal. The signal processing module (7) is arranged inside the capacitive pen body (1), the signal processing module (7) is close to the left side of the elastic sensing module (6), and is used to amplify, filter and perform analog-to-digital conversion processing on the electrical signal, and output a pressure parameter signal for subsequent use. The connection interface module (8) is arranged inside the capacitive pen body (1), the connection interface module (8) is close to the right side of the control chip (10), and the connection interface module (8) is used to realize the transmission of the pressure parameter signal. The installation process module (9) is arranged between the elastic sensing module (6) and the signal processing module (7), and the elastic sensing module (6) and the signal processing module (7) are connected through the installation process module (9), so as to reduce signal transmission delay and noise interference.

2. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The conductive module (5) comprises a conductive rod (501), a support ring (502) and a conductive touch rod (503); one end of the conductive rod (501) is mounted inside the pen tip (2); the outer wall of one end of the conductive rod (501) is fixedly connected to the support ring (502); and the conductive touch rod (503) is mounted on one end of the conductive rod (501).

3. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The elastic sensing module (6) comprises a contact seat (601), a resistance sensor (602), a coil spring (603), a silicone pad (604) and a strain gauge (605); the contact seat (601) is installed on the inner wall of the capacitive pen body (1); a plurality of resistance sensors (602) are embedded and installed on the left side of the contact seat (601); the plurality of resistance sensors (602) are equidistantly arranged in a circular array; a strain gauge (605) is installed on the right side of the resistance sensor (602); a coil spring (603) is installed on the right side of the strain gauge (605); and one end of the coil spring (603) is fixedly connected to the silicone pad (604).

4. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The signal processing module (7) comprises an analog-to-digital converter (701), a digital signal processor (702) and a low-power power management unit (703); the analog-to-digital converter (701) is installed inside the capacitive stylus body (1); the analog-to-digital converter (701) is close to the left side of the elastic sensing module (6); the digital signal processor (702) is installed on the left side of the analog-to-digital converter (701); and the low-power power management unit (703) is installed inside the capacitive stylus body (1) close to the outside of the digital signal processor (702).

5. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The connection interface module (8) comprises a flexible circuit board (801), and the flexible circuit board (801) is installed on the right side of the control chip (10).

6. The refill pressure sensing assembly for an active capacitive stylus according to claim 3, characterized in that: The mounting process module (9) comprises a flip chip (901), wherein the flip chip (901) is arranged between the contact seat (601) and the signal processing module (7), and the contact seat (601) and the signal processing module (7) are connected through a flip chip (901) process.

7. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The elastic locking mechanism (3) comprises a fixed ring (301), a guide groove (302), a rotating groove (303) and a locking spring (304); the outer wall of the fixed ring (301) is fixedly connected to the inner wall of one end of the capacitive stylus body (1); two guide grooves (302) are provided on the right side of the fixed ring (301); the two guide grooves (302) are symmetrically arranged in a ring array; the inner wall of the fixed ring (301) is provided with a rotating groove (303) communicating with the two guide grooves (302); the inner wall of the rotating groove (303) is fixedly connected to two locking springs (304); the two locking springs (304) are symmetrically arranged in a ring array.

8. The refill pressure sensing assembly for an active capacitive stylus according to claim 1, characterized in that: The limiting mechanism (4) comprises a support plate (401), a connecting block (402), a limiting groove (403) and a special-shaped groove (404); two support plates (401) are provided, one end of each of the two support plates (401) is fixedly connected to the inner wall of the pen tip (2); the two support plates (401) are symmetrically arranged in a ring array; the outer side of one end of the support plate (401) is fixedly connected to the connecting block (402); the outer side of the connecting block (402) is provided with a limiting groove (403); and both ends of the outer side of the connecting block (402) are provided with special-shaped grooves (404).

9. The refill pressure sensing assembly for an active capacitive stylus according to claim 3, characterized in that: The right sides of the plurality of silicone pads (604) are in contact with one side of the conductive module (5).

10. The refill pressure sensing assembly for an active capacitive stylus according to claim 3, characterized in that: A plurality of strain gauges (605) form an array and are connected via a Wheatstone bridge circuit.

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