TWM589067U - Active stylus and pen pressure sensing module thereof - Google Patents

Abstract

An active stylus includes a pen, a pen core module and a pen pressure sensing module. The pen pressure sensing module includes a base unit, a linkage block, a conductive rubber block and a pen pressure sensing unit. The base unit defines a socket channel extending along the central axis. The linking block is arranged in the socket channel and has a columnar portion protruding backward. The conductive rubber block is sleeved on the columnar part and has a cap part protruding rearward. The cap part and the columnar part are spaced apart on the central axis by a buffer space. The conductive rubber block can be deformed by being pressed together by the linkage block and the induction circuit board of the pen pressure sensing unit, and by providing a buffer space between the cap portion of the conductive rubber block and the columnar portion of the linkage block, the conductive rubber The deformable amount of the block is larger, which improves the pen pressure resolution and the buffer stroke of the pen core module.

Description

Active stylus and pen pressure sensing module

The present invention relates to a stylus, in particular to an active stylus and its pen pressure sensing module.

Referring to FIGS. 1 and 2, the existing stylus 9 generally includes a pen core (not shown), a pen core base 91, a shaft kit 92, a linkage block 93, a conductive rubber block 94, and a sensing circuit board 95. The refill base 91 sandwiches the refill, and can push the linking block 93 by the pressure transmitted by the refill when the user operates the stylus 9, and the linking block 93 pushes the conductive rubber block In 94, the conductive rubber block 94 is pressed against the induction circuit board 95 and deformed. One end of the conductive rubber block 94 is connected to the linking block 93, and the other end is used to contact the two electrodes 951 of the induction circuit board 95. When the conductive rubber block 94 is deformed by force, the resistance value of the conductive rubber block 94 decreases as the amount of pressure is increased, thereby causing a change in the resistance value on the electrodes 951. The arithmetic unit of the stylus 9 ( (Not shown in the figure) can be converted into pen pressure by weighting operation and output.

However, the existing conductive rubber block 94 does not have too much effective deformation due to space, resulting in insufficient pen pressure resolution. In addition, the thickness of the conductive rubber block 94 is also very limited, so when the stylus 9 falls, The buffer protection of the conductive rubber block 94 to the refill is not enough; refer to FIG. 3. Furthermore, the existing conductive rubber block 94 does not have sufficient limit in the shaft kit 92, resulting in the conductive rubber block 94 having a chance relative to The electrodes 951 generate displacements as shown in FIG. 3, causing errors in pen pressure detection.

Referring to FIGS. 4 and 5, there are two other common implementations. In this design, the conductive rubber block 94 is fixed in the improved interlocking block 93, so that the conductive rubber block 94 is less likely to shift. However, this design will further reduce the size of the conductive rubber block 94, which will adversely affect the resolution of the pen pressure, and is not sufficient to provide sufficient fall protection for the pen core.

Therefore, one of the objectives of the present invention is to provide an active stylus that can overcome the problems of the prior art.

Therefore, in some embodiments, the new active stylus is suitable for writing on a panel, and includes a pen, a pen core module, and a pen pressure sensing module. The pen holder defines an accommodating space extending along a central axis, and includes a pen unit. The refill module is disposed in the accommodating space, and includes a refill body partially protruding from the refill unit. The pen pressure sensing module is disposed in the accommodating space, and includes a base unit, a linkage block, a conductive rubber block, a pen pressure sensing unit, an arithmetic processing unit, and a voltage transformation unit. The base unit defines a socket channel extending along the central axis. The linking block is arranged in the sleeve channel, and has a base part abutting against the pen core module, and a columnar part protruding backward from the rear side of the base part along the central axis. The conductive rubber block is sleeved on the columnar portion and has a cap portion protruding rearward. The cap portion and the columnar portion are spaced apart on the central axis by a buffer space. The pen pressure sensing unit has an induction circuit board located on the central axis and adjacent to the conductive rubber block, wherein the conductive rubber block can be deformed by being pressed together by the linking block and the induction circuit board, and the induction circuit board It is used to generate a signal according to the resistance value of the conductive rubber block after being pressed. The arithmetic processing unit is electrically connected to the pen pressure sensing unit and the pen core module. The arithmetic processing unit is used to receive and process signals transmitted by the sensing circuit board. The voltage transformation unit is electrically connected to the arithmetic processing unit and the refill module, and can convert a voltage according to the processed signal to send to the panel through the refill module.

In some embodiments, the diameter of the base is larger than the diameter of the cylindrical portion, and has a joint surface facing the conductive rubber block and surrounding the peripheral side of the cylindrical portion, the conductive rubber block also has a connection The front edge of the cap portion has a larger diameter than the ring portion of the cap portion, and the ring portion is joined to the joint surface and the cylindrical portion.

In some embodiments, the sensing circuit board has two electrodes, each of which is comb-shaped and crosses each other to interweave into a sensing surface for the conductive rubber block to press against.

In some embodiments, the base unit has a bearing member, the bearing member defines a first mounting slot, the refill module has a pen holder and a pen body, the pen holder can be along the central axis It is movably arranged in the first mounting groove and abuts on the base of the linking block, the pen core body is penetrated through the pen head unit, and one end is arranged on the pen core seat, and the other end is exposed on the pen head unit .

In some embodiments, the pen pressure sensing module further includes a conductive elastic element disposed on the pen core base and electrically connected to the voltage transformation unit, the conductive elastic element is used to reset the pen core mold under pressure Group, and can receive the voltage transmitted from the transformer unit and then transmit to the refill module.

In some implementations, the pen pressure sensing module further includes a main circuit board disposed on the carrier, the conductive elastic member has a set of emitting spring portions disposed on the pen core base, and a self-emission One end of the spring portion extends and is mechanically connected and electrically connected to the extension rod portion of the main circuit board.

In some embodiments, the pen pressure sensing module further includes a power supply unit electrically connected to the main circuit board, the transformer unit is electrically connected to the power supply unit, and can provide the power supply unit The voltage is converted into the voltage required by the refill module.

In addition, another object of the present invention is to provide a pen pressure sensing module that can overcome the defects of the prior art.

Therefore, in some implementation aspects, the novel pen pressure sensing module is suitable for being disposed on an active stylus, which is suitable for writing on a panel and includes a pen module. The pen pressure sensing module includes a base unit, a linkage block, a conductive rubber block, a pen pressure sensing unit, an arithmetic processing unit and a voltage transformation unit. The base unit defines a socket channel extending along a central axis. The linking block is arranged in the sleeve channel, and has a base part abutting against the pen core module, and a columnar part protruding backward from the rear side of the base part along the central axis. The conductive rubber block is sleeved on the columnar portion and has a cap portion protruding rearward. The cap portion and the columnar portion are spaced apart on the central axis by a buffer space. The pen pressure sensing unit has an induction circuit board located on the central axis and adjacent to the conductive rubber block, wherein the conductive rubber block can be deformed by being pressed together by the linking block and the induction circuit board, and the induction circuit board It is used to generate a signal according to the resistance value of the conductive rubber block after being pressed. The arithmetic processing unit is electrically connected to the pen pressure sensing unit and the pen core module. The arithmetic processing unit is used to receive and process signals transmitted by the sensing circuit board. The voltage transformation unit is electrically connected to the arithmetic processing unit and the refill module, and can convert a voltage according to the processed signal to send to the panel through the refill module.

The present invention has at least the following effects: Compared with the existing conductive rubber block, there is a possibility of displacement relative to the sensing circuit board. The active stylus of the present invention makes the conductive rubber block cover the cylindrical portion of the linking block to make the conductive The rubber block is limited by the columnar part and cannot be displaced in the radial direction of the columnar part relative to the columnar part, further fixing the relative position of the conductive rubber block and the induction circuit board in the radial direction of the columnar part; In addition, compared with the existing conductive rubber block, the amount of deformation is insufficient and the buffer protection is not enough. The new active stylus is provided on the central axis between the cap portion of the conductive rubber block and the cylindrical portion of the linkage block. Reserve buffer space, in addition to the deformation of the conductive rubber block after being compressed, the pen pressure resolution is improved, and the buffer stroke of the refill module is improved, which can absorb more when the active stylus is high. The impact force generated when it is dropped greatly reduces the risk of the refill module breaking due to falling.

Referring to FIGS. 6 and 7, an embodiment of the novel active stylus 100 is suitable for writing on a panel (not shown). The panel may be, for example, a digital tablet, a tablet screen, or a smartphone screen. , Wearable device screen and other devices. The active stylus 100 of this embodiment includes a pen lever 1, a pen core module 2, and a pen pressure sensing module 3. The pen holder 1 includes a pen body 11 and a pen head unit 12. The pen body 11 has a hollow cylindrical shape, and has an inner wall surface 111, and two engaging grooves 112 extending from the front end of the inner wall surface 111 toward each other in a front-back direction D1. The pen unit 12 has a pen case 121 detachably disposed at the front end of the pen body 11, and a refill kit 122 disposed at the front end of the pen case 121. The pen body 11 and the pen unit 12 together define an accommodating space 13 extending along a central axis C1. In this embodiment, the pen casing 121 is disposed on the pen body 11 in a screw-fixed manner, but it is not limited in this way.

Referring to FIGS. 8 to 11, the refill module 2 is disposed in the accommodating space 13 and includes a pen body 21 and a pen holder 22. Both the refill body 21 and the refill base 22 are made of metal materials. The refill body 21 is passed through the refill kit 122 of the pen unit 12, and one end is disposed on the refill seat 22, and the other end is exposed from the refill kit 122 in a normal state. The installation position of the refill seat 22 will be described in detail in the following paragraphs.

The pen pressure sensing module 3 is disposed in the accommodating space 13 and includes a base unit 31, a linking block 32, a conductive rubber block 33, a pen pressure sensing unit 34, a main circuit board 35, and a conductive elastic 36, an arithmetic processing unit 37, a power supply unit 38, and a transformer unit 39. In this embodiment, the base unit 31 has a carrier 311, a shaft kit 312, and a cover 313. The carrier 311 has a generally semi-cylindrical structure, and has two engaging portions 311a respectively located on opposite sides of the left and right sides. The appearance of the engaging portions 311a cooperates with the engaging groove 112 (see FIG. 7) of the pen body 11 to enable the base unit 31 to be installed in the receiving space 13 during the process The engaging portions 311a can slide into and engage with the engaging grooves 112 along the front-rear direction D1, respectively. In addition, the carrier 311 is recessed downward from the top surface to form three mounting grooves sequentially arranged along the central axis C1, and the mounting grooves are defined as a first mounting groove 311b, a second mounting groove 311c, and a third Installation slot 311d. The refill seat 22 is disposed in the first mounting groove 311b, and can move under pressure in the first mounting groove 311b along the central axis C1. The shaft assembly 312 is disposed in the second mounting groove 311c and defines a socket channel 312a extending along the central axis C1. The cover member 313 is disposed downward on the carrier 311 along an up-down direction D2 and corresponds to the top of the first mounting groove 311b, together with the carrier 311 in the up-down direction D2 and an upper limit of the left-right direction D3笔芯座22.

Referring to FIGS. 10, 12 and 13, the linking block 32 and the conductive rubber block 33 are sequentially arranged on the socket channel 312 a along the central axis C1. The linking block 32 has a base 321 and a columnar portion 322 protruding rearward from the rear side of the base 321 along the central axis C1. The diameter of the base portion 321 is greater than the diameter of the cylindrical portion 322, and has a slot 321a recessed from the front side along the central axis C1, and a face facing the conductive rubber block 33 and surrounding the cylindrical portion 322 The joining surface 321b on the peripheral side. The slot 321 a is provided for corresponding insertion of the rear end of the refill holder 22, so that the front side of the base 321 abuts the refill holder 22.

The conductive rubber block 33 is sleeved on the columnar portion 322 and has an annular portion 331 and a cap portion 332 protruding rearward from the rear side of the annular portion 331. The ring portion 331 is connected to the front edge of the cap portion 332 and has a larger diameter than the cap portion 332, and surrounds the joint surface 321 b of the peripheral surface of the columnar portion 322 and the base portion 321. The cap portion 332 and the columnar portion 322 are separated by a buffer space 333 on the central axis C1.

Referring to FIGS. 10 and 14, the pen pressure sensing unit 34 is disposed on the base unit 31 adjacent to the conductive rubber block 33 and has an upright position in the third mounting groove 311 d facing the conductive rubber block 33 The induction circuit board 341. The sensing circuit board 341 has two electrodes 341a, and the electrodes 341a are comb-shaped, and are arranged opposite to each other and interwoven into a substantially rectangular sensing surface 341b. In this embodiment, the comb structure of one electrode 341a extends downward, and the comb structure of the other electrode 341a extends upward, but in a variation of the implementation, the comb shape of the electrodes 341a The structure may also be arranged to extend and cross in the left-right direction D3, and is not limited to this embodiment. The pen pressure sensing unit 34 is used to sense the resistance value of the conductive rubber block 33 under different pressure levels. The specific technical content will be described in detail in the following paragraphs.

9-11, the main circuit board 35 is horizontally adjacent to the sensing circuit board 341 and is covered in the third mounting groove 311d, and can accommodate multiple electronic components (such as the arithmetic processing unit 37, the power supply unit 38. Transformer unit 39) installed on the top surface of the main circuit board 35 or on the bottom surface of the main circuit board 35 and accommodated in the third mounting groove 311d, thereby increasing the area where the electronic components can be installed .

The conductive elastic member 36 is disposed on the pen holder 22 and electrically connected to the arithmetic processing unit 37. Specifically, in this embodiment, the conductive elastic member 36 has a set of radiating spring portions 361 disposed on the refill base 22, and a mechanical mechanism that extends backward from one end of the radiating spring portion 361 past the shaft assembly 312 and mechanically It is connected and electrically connected to the extension rod portion 362 of the main circuit board 35. The front and back ends of the launching spring portion 361 abut the refill seat 22 and the bearing member 311 respectively, so as to provide a resilient return force of the refill module 2 toward the front.

The arithmetic processing unit 37 is electrically connected to the pen pressure sensing unit 34 and the pen core module 2, and is used to receive and process signals transmitted by the sensing circuit board 341. The power supply unit 38 is electrically connected to the arithmetic processing unit 37 and has a rechargeable battery (not shown) disposed in the accommodating space 13 for providing the power source of the active stylus 100. The voltage transformation unit 39 is electrically connected to the power supply unit 38 and the refill module 2, and can convert the voltage of the rechargeable battery into the refill module 2 according to the signal processed by the arithmetic processing unit 37 The voltage is then transmitted to the extension rod portion 362, transmitted to the refill module 2 through the transmission spring portion 361, and then sent to the panel through the refill body 21.

This paragraph details the operation flow of the active stylus 100. When a user operates the active stylus 100, the refill body 21 will withstand different degrees of pressure with different writing postures and handwritings, and cooperate with the elastic return force provided by the launch spring portion 361 to interlock The refill seat 22 dynamically moves forward and backward in the first mounting groove 311b, and then the interlocking block 32 is interlocked to be displaced back and forth in the socket channel 312a. When the interlocking block 32 moves backward, the interlocking block 32 will push the conductive rubber block 33 to contact the induction circuit board 341, so that the conductive rubber block 33 and the induction circuit board 341 share The deformation of the pressing force changes the resistance value, and at the same time, the resistance value changes due to the area of the sensing surface 341b crimped on the electrodes 341a. The sensing circuit board 341 can generate a plurality of continuously dynamically changing signals according to the resistance value change of the conductive rubber block 33 after being pressed and send it to the arithmetic processing unit 37. It should be particularly noted that by forming a buffer space 333 between the cap portion 332 of the conductive rubber block 33 and the columnar portion 322 of the linking block 32, the amount of deformation of the conductive rubber block 33 that can be compressed increases. The deformation process of the conductive rubber block 33 is also more gentle, so that the active stylus 100 has a higher and more stable pen pressure resolution. In addition, the improvement of the cushion stroke of the refill module 2 can also absorb more impact force generated when the active stylus 100 is dropped from a height, which greatly reduces the breakage of the refill module 2 due to falling There is a risk, and by setting the refill seat 22 in the first mounting groove 311b, the refill body 21 also partially retracts into the pen unit 12 when the active stylus 100 falls, increasing the buffering effect. In addition, by covering the conductive rubber block 33 with the cylindrical portion 322 of the linking block 32, the range of deviation of the conductive rubber block 33 in the radial direction of the cylindrical portion 322 is limited; By designing the electrodes 341a in a comb-like staggered manner, even if the conductive rubber block 33 is displaced, the contact area ratio on the electrodes 341a will not change, minimizing the influence of the mechanism tolerance on the stability of the pen pressure.

The arithmetic processing unit 37 is used to receive the signal transmitted from the sensor circuit board 341, calculate the pressure of the pen tip, and convert it into the corresponding pressure order (for example, the force of 10g~350g corresponds to the pressure of 1~1024 level, respectively) Order), and then convert different pressure orders to different frequencies (such as the Microsoft MPP standard) or digital signals (such as the universal pen USI protocol). The voltage transformation unit 39 can convert the above-mentioned frequency or signal into the voltage required by the refill module 2 and transmit it to the transmitting spring portion 361 through the extension rod portion 362 of the conductive elastic member 36 and then to the refill module 2 to send to the panel to form a handwriting.

In summary, compared to the existing conductive rubber block 33 having a chance to be displaced relative to the sensing circuit board 341, the new type active stylus 100 has the conductive rubber block 33 sleeved on the cylindrical portion of the linking block 32 322, the conductive rubber block 33 is limited by the columnar portion 322, and cannot be displaced in the radial direction of the columnar portion 322 relative to the columnar portion 322, further fixing the conductive rubber block 33 and the induction circuit board 341 at the The relative position in the radial direction of the columnar portion 322; in addition, compared with the existing conductive rubber block 33, the deformation amount is insufficient and the buffer protection is not enough, the new active stylus 100 is provided by the cap of the conductive rubber block 33 A buffer space 333 is reserved between the portion 332 and the columnar portion 322 of the linking block 32 along the central axis C1. In addition to the deformation of the conductive rubber block 33 after being compressed, the pen pressure resolution is improved and the conductivity is improved. The cushioning stroke of the rubber block 33 can further absorb the impact force generated when the active stylus 100 is dropped from a height, greatly reducing the risk of the pen core module 2 breaking due to falling, so it can indeed be achieved The purpose of this new model.

However, the above are only examples of the new model. When the scope of the new model cannot be limited by this, any simple equivalent changes and modifications made according to the patent application scope and patent specification content of the new model are still regarded as Within the scope of this new patent.

100‧‧‧Active stylus 1‧‧‧pen 11‧‧‧ pen body 111‧‧‧Inner wall 112‧‧‧Snap slot 12‧‧‧pen unit 121‧‧‧ Pen case 122‧‧‧Refill kit 13‧‧‧accommodation space 2‧‧‧Refill module 21‧‧‧Refill body 22‧‧‧Refill seat 3‧‧‧ Pen pressure sensing module 31‧‧‧Base unit 311‧‧‧Carrier 311a‧‧‧Joint Department 311b‧‧‧First installation slot 311c‧‧‧Second mounting slot 311d‧‧‧third mounting slot 312‧‧‧Shaft kit 312a‧‧‧Socket socket 313‧‧‧Cover parts 32‧‧‧Linked block 321‧‧‧Base 321a‧‧‧slot 321b‧‧‧Joint surface 322‧‧‧Column 33‧‧‧ conductive rubber block 331‧‧‧Circular Department 332‧‧‧Cap 333‧‧‧Buffer space 34‧‧‧ Pen pressure sensor unit 341‧‧‧Induction circuit board 341a‧‧‧electrode 341b‧‧‧sensing surface 35‧‧‧Main circuit board 36‧‧‧conductive elastic parts 361‧‧‧ Launch Spring Department 362‧‧‧Extended rod 37‧‧‧ arithmetic processing unit 38‧‧‧Power supply unit 39‧‧‧Transformer unit 9‧‧‧stylus 91‧‧‧Refill seat 92‧‧‧Shaft kit 93‧‧‧Linked block 94‧‧‧ conductive rubber block 95‧‧‧Induction circuit board 951‧‧‧electrode C1‧‧‧Central axis D1‧‧‧Fore and aft direction D2‧‧‧Up and down direction D3‧‧‧direction

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a schematic diagram of an existing stylus; 2 is a schematic front view of a conductive rubber block of a conventional stylus pressing against an induction circuit board; FIG. 3 is a schematic front view illustrating that the existing conductive rubber block does not have sufficient limits, resulting in the conductive rubber block having a chance to be displaced relative to the electrodes, causing errors in pen pressure detection; 4 is a schematic diagram of another existing stylus; 5 is a schematic diagram of the interior of yet another conventional stylus; 6 is a perspective view of an embodiment of the novel active stylus; 7 is an exploded perspective view of the embodiment; 8 is a perspective view of a pen core module and a pen pressure sensing module of this embodiment; 9 is an exploded perspective view of FIG. 8; 10 is another exploded perspective view of FIG. 8; 11 is a block diagram illustrating the electrical connection relationship between the pen pressure sensing module and the pen core module; 12 is a schematic partial cross-sectional view of the embodiment; 13 is a partial enlarged view of FIG. 12; FIG. 14 is a schematic front view illustrating that a pen pressure sensing unit of the pen pressure sensing module has an induction circuit board having two comb-shaped electrodes each intersecting with each other and interwoven with each other Into a rectangular sensing surface; and 15 is a schematic front view illustrating that when a conductive rubber block of this embodiment is pressed against the electrodes, even if a displacement occurs, the ratio of the contact area with the electrodes will not change.

22‧‧‧Refill seat

312a‧‧‧Socket socket

32‧‧‧Linked block

321‧‧‧Base

321a‧‧‧slot

321b‧‧‧Joint surface

322‧‧‧Column

33‧‧‧ conductive rubber block

331‧‧‧Circular Department

332‧‧‧Cap

333‧‧‧Buffer space

341‧‧‧Induction circuit board

Claims (8)

An active stylus pen is suitable for writing on a panel. The active stylus pen includes: A stroke rod, defining an accommodating space extending along a central axis, and including a stroke head unit; A pen core module, disposed in the accommodating space, and including a pen core body partially protruding from the pen unit; and A pen pressure sensing module is set in the accommodating space and includes A base unit defining a socket channel extending along the central axis, A linking block, which is arranged in the sleeve channel and has a base abutting on the refill module, and a cylindrical part protruding backward from the rear side of the base along the central axis, A conductive rubber block is sleeved on the column portion and has a cap portion protruding rearward, the cap portion and the column portion are spaced apart on the central axis by a buffer space, A pressure sensing unit has a sensing circuit board located on the central axis and adjacent to the conductive rubber block, wherein the conductive rubber block can be deformed by being pressed by the linking block and the sensing circuit board together, and the sensing circuit board It is used to generate a signal according to the resistance value of the conductive rubber block after being pressed, An arithmetic processing unit, electrically connecting the pen pressure sensing unit and the pen core module, the arithmetic processing unit is used to receive and process signals transmitted by the sensing circuit board, and A voltage transformation unit is electrically connected to the arithmetic processing unit and the refill module, and can convert a voltage according to the processed signal to send to the panel through the refill module. The active stylus according to claim 1, wherein the diameter of the base is larger than the diameter of the columnar part, and has a joint surface facing the conductive rubber block and surrounding the peripheral side of the columnar part, the The conductive rubber block further has an annular portion connected to the front edge of the cap portion and having a larger diameter than the cap portion. The annular portion is joined to the joint surface and the cylindrical portion. The active stylus according to claim 1, wherein the sensing circuit board has two electrodes, each of which is comb-shaped and crosses each other and interwoven into a sensing surface for the conductive rubber block to press against . The active stylus according to claim 1, wherein the base unit has a carrier, the carrier defines a first mounting slot, and the pen core module has a pen holder and a pen body, the The refill seat is movably provided along the central axis in the first mounting groove and abuts against the base of the linking block, the refill body penetrates the pen unit, and one end is provided in the refill seat, The other end is exposed to the pen unit. The active stylus according to claim 4, wherein the pen pressure sensing module further includes a conductive elastic member disposed on the pen holder and electrically connected to the voltage transformation unit, the conductive elastic member is used for The pen core module under pressure is reset, and the voltage transmitted from the voltage transformation unit can be received and then transmitted to the pen core module. The active stylus according to claim 5, wherein the pen pressure sensing module further includes a main circuit board disposed on the carrier, and the conductive elastic member has a set of transmitters disposed on the pen holder The spring portion, and an extension rod portion extending from one end of the emitting spring portion and mechanically connected and electrically connected to the main circuit board. The active stylus according to claim 6, wherein the pen pressure sensing module further includes a power supply unit electrically connected to the main circuit board, and the transformer unit is electrically connected to the power supply unit, and The voltage provided by the power supply unit can be converted into the voltage required by the refill module. A pen pressure sensing module is suitable for being set on an active stylus. The active pen is suitable for writing on a panel and includes a pen core module. The pen pressure sensing module includes A base unit defines a socket channel extending along a central axis; A linking block is provided in the sleeve channel and has a base abutting the refill module, and a columnar portion protruding rearward from the rear side of the base along the central axis; A conductive rubber block, sleeved on the columnar part, and having a cap part protruding rearward, the cap part and the columnar part are spaced apart on the central axis by a buffer space; A pressure sensing unit has a sensing circuit board located on the central axis and adjacent to the conductive rubber block, wherein the conductive rubber block can be deformed by being pressed by the linking block and the sensing circuit board together, and the sensing circuit board It is used to generate a signal according to the resistance value of the conductive rubber block after being pressed; An arithmetic processing unit, which is electrically connected to the pen pressure sensing unit and the pen core module, and the arithmetic processing unit is used to receive and process signals transmitted by the sensing circuit board; and A voltage transformation unit is electrically connected to the arithmetic processing unit and the refill module, and can convert a voltage according to the processed signal to send to the panel through the refill module.

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