CN210515236U - Active touch pen and pen pressure sensing module thereof - Google Patents

Abstract

An active touch pen and a pen pressure sensing module thereof are provided. The pen pressure sensing module comprises 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 a central axis. The linkage block is arranged in the sleeve joint channel and is provided with a post-shaped part protruding backwards. The conductive rubber block is sleeved on the columnar part and is provided with a cap part protruding towards the back, and the cap part and the columnar part form a buffer space on the central shaft at intervals. The conductive rubber block can be pressed and pressed by the linkage block and the induction circuit board of the pen pressure induction unit together to generate deformation, and a buffer space is reserved between the cap part of the conductive rubber block and the columnar part of the linkage block, so that the deformability of the conductive rubber block is larger, and the pen pressure resolution and the buffer stroke of the pen core module are improved.

Description

Active touch pen and pen pressure sensing module thereof

Technical Field

The utility model relates to a touch-control pen especially relates to an active touch-control pen and a pressure sensing module thereof.

Background

Referring to fig. 1 and 2, the conventional touch pen 9 generally includes a pen core (not shown), a pen core holder 91, a shaft assembly 92, a linkage block 93, a conductive rubber block 94, and a sensing circuit board 95. The refill seat 91 sandwiches the refill therein, and when a user operates the stylus 9, the pressure transmitted by the refill pushes the linkage block 93, and the linkage block 93 pushes the conductive rubber block 94, so that the conductive rubber block 94 is pressed against the sensing circuit board 95 by force and deforms. One end of the conductive rubber block 94 is connected to the linkage block 93, and the other end is used for contacting two electrodes 951 of the induction circuit board 95. When the conductive rubber block 94 is deformed by a force, the resistance value of the conductive rubber block 94 decreases as the pressure amount increases, so that the resistance value changes on the electrode 951, and an arithmetic unit (not shown) of the stylus pen 9 converts the resistance value into a pen pressure through a weighting operation and outputs the pen pressure.

However, the effective deformation of the conventional conductive rubber block 94 is not too much due to the spatial relationship, which results in insufficient resolution of the pen pressure; in addition, the thickness of the conductive rubber block 94 is limited, so that when the touch control pen 9 falls, the buffering protection force of the conductive rubber block 94 on the pen core is not enough; referring to fig. 3, in addition, the conventional conductive rubber block 94 has no sufficient limit in the shaft sleeve 92, so that the conductive rubber block 94 has a chance to displace relative to the electrode 951 as shown in fig. 3, which causes an error in pen pressure detection.

Referring to fig. 4 and 5, in another two common embodiments, the conductive rubber block 94 is fixed in the modified linkage block 93, so that the conductive rubber block 94 is less prone to shift, but the conductive rubber block 94 is further reduced in size, which adversely affects the resolution of the pen pressure and is not enough to provide enough shock protection for the pen core.

Disclosure of Invention

One of the objectives of the present invention is to provide an active stylus capable of overcoming the problems of the prior art.

The utility model discloses an active stylus is applicable to and writes on the panel in some implementation form appearance to contain pen-holder, refill module and pen pressure sensing module. The pen holder defines an accommodating space extending along the central axis and comprises a pen point unit. The pen core module is arranged in the accommodating space and comprises a pen core body, and part of the pen core body extends out of the pen point unit. The pen pressure sensing module is arranged in the accommodating space and comprises a base unit, a linkage block, a conductive rubber block, a pen pressure sensing unit, an operation processing unit and a voltage transformation unit. The base unit defines a socket channel extending along the central axis. The linkage block is arranged in the sleeving connection channel and is provided with a base portion abutting against the refill module and a columnar portion protruding backwards from the rear side of the base portion along the central shaft. The conductive rubber block is sleeved on the columnar portion and provided with a rearwardly protruding cap portion, and the cap portion and the columnar portion are separated to form a buffer space on the central shaft. The pen pressure sensing unit is provided with a sensing circuit board which is positioned on the central shaft and is adjacent to the conductive rubber block, wherein the conductive rubber block can be pressed and pressed by the linkage block and the sensing circuit board together to generate deformation, and the sensing circuit board is used for generating signals according to the change of the resistance value of the compressed conductive rubber block. The operation processing unit is electrically connected with the pen pressure sensing unit and the pen core module and is used for receiving and processing signals transmitted by the sensing circuit board. The voltage transformation unit is electrically connected with the operation processing unit and the refill module and can transform voltage according to processed signals and send the voltage to the panel through the refill module.

In some embodiments, the base portion has a diameter larger than that of the columnar portion, and has an engagement surface facing the conductive rubber block and surrounding a periphery of the columnar portion, and the conductive rubber block further has an annular portion connected to a front edge of the cap portion and having a diameter larger than that of the cap portion, the annular portion being engaged with the engagement surface and the columnar portion.

In some embodiments, the sensing circuit board has two electrodes, each of the electrodes is comb-shaped and is disposed opposite to each other in an intersecting manner to form a sensing surface against which the conductive rubber blocks are pressed.

In some embodiments, the base unit has a supporting member defining a first mounting groove, the cartridge module has a cartridge seat and a cartridge body, the cartridge seat is movably disposed in the first mounting groove along the central axis and abuts against the base of the linkage block, the cartridge body penetrates through the pen head unit, and one end of the cartridge body is disposed in the cartridge seat, and the other end of the cartridge body is exposed from the pen head unit.

In some embodiments, the pressure sensing module further includes a conductive elastic member disposed on the cartridge seat and electrically connected to the voltage transforming unit, and the conductive elastic member is used for resetting the pressed cartridge module and receiving the voltage transmitted from the voltage transforming unit and then transmitting the voltage to the cartridge module.

In some embodiments, the pressure sensing module further includes a main circuit board disposed on the supporting member, and the conductive elastic member has a launching spring portion sleeved on the refill seat, and an extending rod portion extending from one end of the launching spring portion, mechanically connected to the launching spring portion, and electrically connected to 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, and the voltage transforming unit is electrically connected to the power supply unit and is capable of transforming the voltage provided by the power supply unit into the voltage required by the pen core module.

In addition, another objective of the present invention is to provide a pressure sensing module capable of overcoming the drawbacks of the prior art.

The utility model discloses a pen pressure sensing module is applicable to the setting at active stylus in some implementation form appearance, active stylus is applicable to and writes and contain the refill module on the panel. The pen pressure sensing module comprises a base unit, a linkage block, a conductive rubber block, a pen pressure sensing unit, an operation processing unit and a voltage transformation unit. The base unit defines a socket channel extending along a central axis. The linkage block is arranged in the sleeving connection channel and is provided with a base portion abutting against the refill module and a columnar portion protruding backwards from the rear side of the base portion along the central shaft. The conductive rubber block is sleeved on the columnar portion and provided with a rearwardly protruding cap portion, and the cap portion and the columnar portion are separated to form a buffer space on the central shaft. The pen pressure sensing unit is provided with a sensing circuit board which is positioned on the central shaft and is adjacent to the conductive rubber block, wherein the conductive rubber block can be pressed and pressed by the linkage block and the sensing circuit board together to generate deformation, and the sensing circuit board is used for generating signals according to the change of the resistance value of the compressed conductive rubber block. The operation processing unit is electrically connected with the pen pressure sensing unit and the pen core module and is used for receiving and processing signals transmitted by the sensing circuit board. The voltage transformation unit is electrically connected with the operation processing unit and the refill module and can transform voltage according to processed signals and send the voltage to the panel through the refill module.

The utility model discloses a profitable effect lies in: compared with the existing conductive rubber block, the active stylus pen of the present invention has the opportunity to displace relative to the sensing circuit board, and the conductive rubber block is sleeved on the columnar portion of the linkage block, so that the conductive rubber block is limited by the columnar portion and cannot displace relative to the columnar portion in the radial direction of the columnar portion, and the relative positions of the conductive rubber block and the sensing circuit board in the radial direction of the columnar portion are further fixed; in addition, compare in the not enough and buffering protection power of the deflection of current conductive rubber piece, the utility model discloses active touch-control pen is through reserving the buffer space along the center pin between the cap portion of conductive rubber piece and the column portion of interlock piece, except that make conductive rubber piece pressurized back deflection can be bigger, improves the pen pressure resolution, and promoted the buffer stroke of refill module, and then can absorb more impact forces that produce when active touch-control pen falls by the eminence, reduced the refill module by a wide margin because of falling cracked risk.

Drawings

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of the interior of a conventional stylus;

FIG. 2 is a front view of a conventional stylus with a conductive rubber block pressed against an inductive circuit board;

FIG. 3 is a front view illustrating that the conventional conductive rubber block has insufficient spacing, so that the conductive rubber block has a chance to displace relative to the electrodes, resulting in an error in the detection of the pen pressure;

FIG. 4 is a schematic view of the interior of another conventional stylus;

FIG. 5 is a schematic diagram of the interior of yet another conventional stylus;

fig. 6 is a perspective view of an embodiment of an active stylus of the present invention;

FIG. 7 is an exploded perspective view of the embodiment;

FIG. 8 is a perspective view of a cartridge module and a pressure sensing module of the embodiment;

FIG. 9 is an exploded perspective view of FIG. 8;

FIG. 10 is another exploded perspective view of FIG. 8;

fig. 11 is a block diagram illustrating an electrical connection relationship between the pressure sensing module and the cartridge module;

FIG. 12 is a partial cross-sectional view of the embodiment;

FIG. 13 is an enlarged fragmentary view of FIG. 12;

FIG. 14 is a front view of the pen pressure sensing module with a pen pressure sensing unit having a sensing circuit board with two comb-shaped electrodes interleaved with each other to form a generally rectangular sensing surface; and

fig. 15 is a front view schematically illustrating that when a conductive rubber block of the embodiment is pressed against the electrode, the ratio of the contact area with the electrode does not change even if displacement occurs.

Detailed Description

Referring to fig. 6 and 7, an embodiment of the active stylus 100 of the present invention is suitable for writing on a panel (not shown), which may be, for example, a digital drawing board, a tablet computer screen, a smart phone screen, a wearable device screen, or the like. The active stylus 100 of the embodiment includes a pen shaft 1, a pen core module 2, and a pen pressure sensing module 3. The pen holder 1 includes a body 11 and a nib unit 12. The pen body 11 has a hollow cylindrical shape and has an inner wall surface 111 and two engaging grooves 112 extending rearward from the front end of the inner wall surface 111 in a front-rear direction D1. The pen head unit 12 has a pen head housing 121 detachably disposed at the front end of the pen body 11, and a pen core kit 122 disposed at the front end of the pen head housing 121. The pen body 11 and the pen head unit 12 define a receiving space 13 extending along a central axis C1. In the embodiment, the pen head housing 121 is disposed on the pen body 11 in a screwed manner, but the invention is not limited thereto.

Referring to fig. 8 to 11, the cartridge module 2 is disposed in the accommodating space 13 and includes a cartridge body 21 and a cartridge seat 22. The refill body 21 and the refill seat 22 are made of metal materials. The pen core body 21 is disposed through the pen core kit 122 of the pen point unit 12, and one end of the pen core body is disposed on the pen core seat 22, and the other end of the pen core body is exposed to the pen core kit 122 in a normal state. The position of the cartridge holder 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 linkage block 32, a conductive rubber block 33, a pen pressure sensing unit 34, a main circuit board 35, a conductive elastic member 36, an operation processing unit 37, a power supply unit 38, and a transforming unit 39. In the present embodiment, the base unit 31 has a bearing member 311, a shaft sleeve member 312, and a cover member 313. The bearing member 311 is generally in a semi-cylindrical structure and has two engaging portions 311a located on opposite left and right sides. The shape of the engaging portion 311a is matched with the engaging groove 112 (see fig. 7) of the pen body 11, so that the engaging portion 311a can slide into and engage with the engaging groove 112 along the front-back direction D1 respectively when the base unit 31 is installed in the accommodating space 13. In addition, the supporting element 311 is recessed downward from the top surface to form three mounting slots sequentially arranged along the central axis C1, and the mounting slots are defined as a first mounting slot 311b, a second mounting slot 311C and a third mounting slot 311 d. The refill seat 22 is disposed in the first mounting groove 311b and is movable in the first mounting groove 311b along the central axis C1 under pressure. The shaft sleeve 312 is disposed in the second mounting groove 311C and defines a receiving channel 312a extending along the central axis C1. The cover 313 is disposed downward along a vertical direction D2 on the bearing 311 corresponding to the upper side of the first mounting slot 311b, and together with the bearing 311, limits the refill seat 22 in the vertical direction D2 and a left-right direction D3.

Referring to fig. 10, 12 and 13, the linkage block 32 and the conductive rubber block 33 are sequentially disposed on the socket channel 312a along the central axis C1. The linkage block 32 has a base 321 and a column 322 protruding from the rear side of the base 321 along the central axis C1. The base portion 321 has a diameter larger than that of the columnar portion 322, and has a slot 321a recessed from the front side along the central axis C1, and a joint surface 321b facing the conductive rubber block 33 and surrounding the columnar portion 322. The slot 321a is used for inserting the tail end of the refill seat 22, so that the front side of the base 321 abuts against the refill seat 22.

The conductive rubber block 33 is sleeved on the cylindrical 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 annular portion 331 is connected to the front edge of the cap portion 332, has a larger diameter than the cap portion 332, and is circumferentially engaged with the engagement surface 321b of the base portion 321 and the circumferential surface of the column portion 322. The cap portion 332 and the column portion 322 define a buffer space 333 at the center axis C1.

Referring to fig. 10 and 14, the pressure sensing unit 34 is disposed on the base unit 31 adjacent to the conductive rubber block 33, and has a sensing circuit board 341 vertically disposed in the third mounting groove 311d and facing the conductive rubber block 33. The sensing circuit board 341 has two electrodes 341a, and the electrodes 341a are comb-shaped, and are arranged to be opposite to each other and interleaved into a generally rectangular sensing surface 341 b. In the embodiment, the comb-shaped structure of one electrode 341a extends downward, and the comb-shaped structure of the other electrode 341a extends upward, but in an alternative implementation, the comb-shaped structures of the electrodes 341a may extend and cross in the left-right direction D3, and the implementation is not limited to this embodiment. The pen pressure sensing unit 34 is used for sensing the resistance value change of the conductive rubber block 33 under different compression degrees, and the specific technical content will be detailed in the following paragraphs.

Referring to fig. 9 to 11, the main circuit board 35 is horizontally adjacent to the sensing circuit board 341 and covers the third mounting groove 311d, and a plurality of electronic components (e.g., the processing unit 37, the power supply unit 38, and the transforming unit 39) can be disposed on the top surface of the main circuit board 35 or disposed on the bottom surface of the main circuit board 35 and received in the third mounting groove 311d, thereby increasing the area where the electronic components can be disposed.

The conductive elastic element 36 is disposed on the pen core holder 22 and electrically connected to the arithmetic processing unit 37. Specifically, in the present embodiment, the conductive elastic element 36 has a launching spring portion 361 installed on the refill seat 22, and an extending rod portion 362 extending from one end of the launching spring portion 361 to the rear side, extending above the shaft sleeve 312, and mechanically and electrically connected to the main circuit board 35. The front end and the rear end of the launching spring 361 are respectively abutted against the refill seat 22 and the bearing 311 to provide a forward elastic restoring force for the refill module 2.

The arithmetic processing unit 37 is electrically connected to the pen pressure sensing unit 34 and the pen core module 2, and is configured to receive and process the signal 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 a power source for the active stylus 100. The transformer unit 39 is electrically connected to the power supply unit 38 and the cartridge module 2, and can convert the voltage of the rechargeable battery into a voltage required by the cartridge module 2 according to the signal processed by the processing unit 37, transmit the voltage to the extension rod 362, transmit the voltage to the cartridge module 2 through the transmission spring 361, and transmit the voltage to the panel through the cartridge body 21.

This section describes the operation of the active stylus 100 in detail. When a user operates the active stylus 100, the pen core body 21 bears different degrees of pressure along with different writing postures and handwriting, and cooperates with the elastic restoring force provided by the launching spring portion 361 to link the pen core seat 22 to move back and forth dynamically in the first mounting groove 311b, so as to link the linking block 32 to move back and forth in the sleeving channel 312 a. When the linkage block 32 moves backward, the linkage block 32 pushes the conductive rubber block 33 to abut against the sensing circuit board 341, so that the conductive rubber block 33 not only deforms due to the common pressing of the linkage block 32 and the sensing circuit board 341 and changes the resistance value, but also changes the resistance value according to the different areas of the sensing surface 341b pressed against the electrode 341 a. The sensing circuit board 341 can generate a plurality of signals with continuous dynamic changes according to the resistance value changes of the conductive rubber block 33 after being pressed, and transmit the signals to the arithmetic processing unit 37. It should be noted that, by forming the buffer space 333 between the cap portion 332 of the conductive rubber block 33 and the column portion 322 of the linkage block 32, the amount of deformation of the conductive rubber block 33 that can be pressed is increased, the deformation process of the conductive rubber block 33 is more gradual, and the active stylus 100 has a higher and more stable pen pressure resolution. In addition, the buffer stroke of the pen core module 2 is increased to absorb more impact force generated when the active stylus 100 falls from a high place, so as to greatly reduce the risk of breakage of the pen core module 2 caused by falling, and the pen core holder 22 is disposed in the first mounting groove 311b, so that the pen core body 21 is partially retracted into the pen head unit 12 when the active stylus 100 falls, thereby increasing the buffer effect. In addition, the conductive rubber block 33 is sleeved on the columnar part 322 of the linkage block 32, so that the offset range of the conductive rubber block 33 in the radial direction of the columnar part 322 is limited; referring also to fig. 15, by designing the electrodes 341a to be comb-shaped and interlaced, even if the conductive rubber block 33 is displaced, the contact area ratio on the electrodes 341a is not changed, and the influence of the mechanical tolerance on the stability of the writing pressure is minimized.

The arithmetic processing unit 37 is configured to receive the signal transmitted by the sensing circuit board 341, calculate the pen tip pressure, convert the pen tip pressure into a corresponding pressure order (for example, the forces of 10g to 350g correspond to pressure orders of 1 to 1024 orders, respectively), and convert different pressure orders into different frequencies (such as microsoft MPP standard) or digital signals (such as the universal pen USI protocol). The transformer unit 39 converts the frequency or the signal into a voltage required by the cartridge module 2, transmits the voltage to the firing spring 361 via the extension rod 362 of the conductive elastic member 36, and transmits the voltage to the cartridge module 2 to be transmitted to a panel to form handwriting.

To sum up, compared to the conventional conductive rubber block 33 that has a chance to displace relative to the sensing circuit board 341, the active stylus pen 100 of the present invention enables the conductive rubber block 33 to be limited by the column portion 322 by sleeving the conductive rubber block 33 on the column portion 322 of the linkage block 32, and cannot displace relative to the column portion 322 in the radial direction of the column portion 322, so as to further fix the relative positions of the conductive rubber block 33 and the sensing circuit board 341 in the radial direction of the column portion 322; in addition, compare in the not enough and buffering protective force of the deflection of current conductive rubber piece 33, the utility model discloses active touch-control pen 100 is through reserving buffer space 333 between cap portion 332 of conductive rubber piece 33 and the column portion 322 of trace block 32 along center pin C1, except that make conductive rubber piece 33 pressurized back deflection can be bigger, improves the pen pressure resolution, and promoted conductive rubber piece 33's buffer stroke, and then can absorb more impact forces that produce when active touch-control pen 100 is dropped by the eminence, reduced refill module 2 because of falling the cracked risk of falling by a wide margin, so can reach the purpose of the utility model.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the description of the present invention are still within the scope of the present invention.

Claims (8)

1. An active stylus, suitable for writing on a panel, comprising: the active stylus includes:

a pen holder defining an accommodating space extending along a central axis and including a pen head unit;

the pen core module is arranged in the accommodating space and comprises a pen core body, and part of the pen core body extends out of the pen point unit; and

a pen pressure sensing module disposed in the accommodating space and including

A base unit defining a socket channel extending along the central axis,

the linkage block is arranged in the sleeving connection channel and is provided with a base abutting against the refill module and a columnar part protruding backwards from the rear side of the base along the central shaft,

a conductive rubber block sleeved on the columnar part and provided with a cap part protruding backwards, wherein the cap part and the columnar part form a buffer space on the central shaft at intervals,

the pen pressure sensing unit is provided with a sensing circuit board which is positioned on the central shaft and is adjacent to the conductive rubber block, wherein the conductive rubber block can be pressed by the linkage block and the sensing circuit board together to generate deformation, the sensing circuit board is used for generating signals according to the change of the resistance value of the compressed conductive rubber block,

the operation processing unit is electrically connected with the pen pressure sensing unit and the pen core module and is used for receiving and processing the signal transmitted by the sensing circuit board, and

and the voltage transformation unit is electrically connected with the operation processing unit and the refill module and can transform voltage according to the processed signal and send the voltage to the panel through the refill module.

2. The active stylus of claim 1, wherein: the diameter of basal portion is greater than the diameter of column portion to have the face towards conductive rubber piece and surround in the composition surface of column portion week side, conductive rubber piece still has connect in cap portion leading edge and diameter are greater than the annular portion of cap portion, the annular portion joint in the composition surface with column portion.

3. The active stylus of claim 1, wherein: the induction circuit board is provided with two electrodes which are respectively in a comb shape and are oppositely and crossly arranged to be interwoven into an induction surface for the conductive rubber block to press against.

4. The active stylus of claim 1, wherein: the base unit is provided with a bearing piece which defines a first mounting groove, the refill module is provided with a refill seat and a refill body, the refill seat can be movably arranged in the first mounting groove along the central shaft and is abutted against the base part of the linkage block, the refill body penetrates through the pen point unit, one end of the refill body is arranged in the refill seat, and the other end of the refill body is exposed out of the pen point unit.

5. The active stylus of claim 4, wherein: the pen pressure sensing module further comprises a conductive elastic piece arranged on the pen core seat and electrically connected with the voltage transformation unit, the conductive elastic piece is used for resetting the pressed pen core module and can receive the voltage transmitted by the voltage transformation unit and then transmit the voltage to the pen core module.

6. The active stylus of claim 5, wherein: the pen pressure sensing module further comprises a main circuit board arranged on the bearing piece, the conductive elastic piece is provided with an emission spring portion sleeved on the refill seat, and an extension rod portion extending from one end of the emission spring portion, mechanically connected with the emission spring portion and electrically connected with the main circuit board.

7. The active stylus of claim 6, wherein: the pen pressure sensing module further comprises a power supply unit electrically connected with the main circuit board, and the voltage transformation unit is electrically connected with the power supply unit and can convert the voltage provided by the power supply unit into the voltage required by the pen core module.

8. A pressure sensing module is suitable for being arranged on an active touch pen, the active touch pen is suitable for writing on a panel and comprises a pen core module, and the pressure sensing module comprises

A base unit defining a socket channel extending along a central axis;

the linkage block is arranged in the sleeving connection channel and is provided with a base abutting against the refill module and a columnar part protruding backwards from the rear side of the base along the central shaft;

the conductive rubber block is sleeved on the columnar part and is provided with a cap part protruding backwards, and a buffer space is formed between the cap part and the columnar part on the central shaft;

the pen pressure sensing unit is provided with a sensing circuit board which is positioned on the central shaft and is adjacent to the conductive rubber block, wherein the conductive rubber block can be pressed by the linkage block and the sensing circuit board together to generate deformation, and the sensing circuit board is used for generating signals according to the change of the resistance value of the compressed conductive rubber block;

the operation processing unit is electrically connected with the pen pressure sensing unit and the pen core module and is used for receiving and processing the signals transmitted by the sensing circuit board; and

and the voltage transformation unit is electrically connected with the operation processing unit and the refill module and can transform voltage according to the processed signal and send the voltage to the panel through the refill module.

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