Touch pen

Abstract

A touch pen comprises a hollow pen tube, a pen point, a cantilever plate, a first strain electrode and a second strain electrode. The pen point is arranged at the open end of the hollow pen tube. The cantilever plate is arranged in the hollow pen tube and provided with a fixed side, a free side, a first surface and a second surface, the fixed side is fixed to the hollow pen tube, and the first surface faces the open end. The first strain electrode is arranged on the first surface of the cantilever plate. The second strain electrode is arranged on the second surface of the cantilever plate. The pen point can move relative to the hollow pen tube to drive the cantilever plate to deform, so that the first strain electrode and the second strain electrode deform synchronously.

Description

Technical Field

[0001] This invention relates to an electronic product, and more particularly to a stylus. Background Technology

[0002] With the rapid development of technology, many electronic devices use touch panels as their operating interface, such as smartphones or tablets, to enhance convenience for users. However, to make the operation of touch panels faster and more accurate, most users choose to use a stylus for touch input (such as writing or clicking).

[0003] Styluses typically incorporate a pressure sensor within the pen casing. When a user touches the touchscreen with the stylus, the pen tip presses against the pressure sensor to perform touch operations. However, this pressure sensor-triggered method requires the user to apply considerable force to activate the pen smoothly, and a certain travel distance is also needed between the pressure sensor and the pen tip. This can cause the pen tip to wobble during use, affecting the tactile feedback. Summary of the Invention

[0004] In view of the above, in one embodiment, a stylus is provided, comprising a hollow pen tube, a pen tip, a cantilever plate, a first strain electrode, and a second strain electrode. The hollow pen tube has an open end. The pen tip is disposed at the open end. The cantilever plate is disposed inside the hollow pen tube, and the cantilever plate has a fixed side, a free side, and opposing first and second surfaces. The fixed side is fixed to the hollow pen tube, and the first surface faces the open end. The first strain electrode is disposed on the first surface of the cantilever plate. The second strain electrode is disposed on the second surface of the cantilever plate. The pen tip is movable relative to the hollow pen tube to cause the cantilever plate to deform, causing the first and second strain electrodes to deform synchronously.

[0005] In summary, the stylus of this embodiment can move its tip relative to the hollow pen tube, causing the cantilever plate to deform and thus triggering the generation of a signal by simultaneously deforming the strain electrodes. This significantly reduces the force required for user operation and avoids pen tip wobbling during operation, resulting in a better tactile feel. Furthermore, by placing the first and second strain electrodes on opposite surfaces of the cantilever plate, the deformation of these electrodes generates a greater difference in resistance, improving sensing sensitivity and simplifying the circuit design. Attached Figure Description

[0006] Figure 1 This is a perspective view of the first embodiment of the stylus of the present invention;

[0007] Figure 2This is an exploded perspective view of the first embodiment of the stylus of the present invention;

[0008] Figure 3 This is a partial perspective view of the first embodiment of the stylus of the present invention;

[0009] Figure 4 This is a cross-sectional view of the first embodiment of the stylus of the present invention;

[0010] Figure 5 This is an animation diagram illustrating the operation of the first embodiment of the stylus of the present invention;

[0011] Figure 6 This is a circuit diagram of the first embodiment of the stylus of the present invention;

[0012] Figure 7 This is a partial planar schematic diagram of the second embodiment of the stylus of the present invention;

[0013] Figure 8 This is a circuit diagram of the second embodiment of the stylus of the present invention;

[0014] Figure 9 This is a partial perspective view of the third embodiment of the stylus of the present invention;

[0015] Figure 10 This is a partial perspective view of the fourth embodiment of the stylus of the present invention;

[0016] Figure 11 This is a partial perspective view of the fifth embodiment of the stylus of the present invention;

[0017] Figure 12 This is a partial perspective view of the sixth embodiment of the stylus of the present invention;

[0018] Figure 13 This is a partial perspective view of the seventh embodiment of the stylus of the present invention.

[0019] [Symbol Explanation]

[0020] 1: Stylus

[0021] 10: Hollow Pen Tube

[0022] 101:Pen body tube

[0023] 102: Pen tip tube

[0024] 11: Open end

[0025] 20: Pen tip

[0026] 201: First threaded section

[0027] 30: Cantilever plate

[0028] 301: Side

[0029] 305: Convex plate

[0030] 31: Fixed side

[0031] 32: Free side

[0032] 33: First Surface

[0033] 34: Second Surface

[0034] 35: Groove

[0035] 36: Support plate

[0036] 361: Opening groove

[0037] 37: Fixing plate

[0038] 41: First strain electrode

[0039] 42: Second strain electrode

[0040] 43: Third strain electrode

[0041] 44: Fourth strain electrode

[0042] 45: First Flexible Sheet

[0043] 451: First side

[0044] 46: Second flexible sheet

[0045] 461: Second side

[0046] 47, 47a, 47b, 47c, 47d, 47e: Bending pieces

[0047] 471b, 471d: Openwork section

[0048] 50: Linkage components

[0049] 51: First end

[0050] 52: Second end

[0051] 53: Hollow Column

[0052] 531: Second threaded section

[0053] 54: Touch plate

[0054] 541: Protrusion

[0055] 55: Connecting plate

[0056] 60: Circuit board

[0057] C: Sensing circuit

[0058] 61: First fixed resistor

[0059] 62: Second fixed resistor

[0060] 63: Operational amplifier

[0061] L1: Arrow Detailed Implementation

[0062] It should be noted that in the descriptions of the various embodiments, the terms "first," "second," "third," and "fourth" are used to describe different elements, and these elements are not limited by such predicates. Furthermore, for ease of explanation and clarity, the thickness or dimensions of the elements in the drawings are exaggerated, omitted, or approximated for the understanding and reading of those skilled in the art. The dimensions of each element are not exactly their actual dimensions and are not intended to limit the implementation conditions of the invention; therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in this invention. The same reference numerals will be used to denote the same or similar elements in all the drawings.

[0063] Figure 1 This is a perspective view of the first embodiment of the stylus of the present invention. Figure 2 This is an exploded perspective view of the first embodiment of the stylus of the present invention. Figure 3 This is a partial perspective view of the first embodiment of the stylus of the present invention. Figure 4 This is a cross-sectional view of the first embodiment of the stylus of the present invention. Figure 5 This is an animated diagram illustrating the operation of the first embodiment of the stylus of the present invention. Figures 1 to 5 As shown, the stylus 1 of this embodiment includes a hollow pen tube 10, a pen tip 20, a cantilever plate 30, a first strain electrode 41 and a second strain electrode 42.

[0064] like Figure 1 and Figure 2 As shown, the hollow pen tube 10 has an open end 11. In this embodiment, the hollow pen tube 10 has a pen body 101 and a pen tip 102. One end of the pen tip 102 is attached to the pen body 101. For example, the pen body 101 and the pen tip 102 can be connected by screwing, snapping, or tight fitting. The open end 11 is located at the other end of the pen tip 102. In some embodiments, the pen body 101 and the pen tip 102 can also be integrally connected, forming a one-piece structure for the hollow pen tube 10.

[0065] like Figures 2 to 4As shown, the pen tip 20 is disposed at the open end 11 of the hollow pen tube 10 and is movable relative to the hollow pen tube 10. In this embodiment, the pen tip 20 is connected to a linkage 50, which is movably disposed inside the hollow pen tube 10 and adjacent to the open end 11. The linkage 50 has a first end 51 and a second end 52 opposite to each other, wherein the first end 51 is closer to the open end 11 relative to the second end 52, and the linkage 50 is not fixed and can move along the extending direction of the hollow pen tube 10 when subjected to force.

[0066] like Figure 2 and Figure 4 As shown, in this embodiment, the first end 51 of the linkage 50 has a hollow post 53, the end of the pen tip 20 located inside the hollow pen tube 10 has a first threaded portion 201, the hollow post 53 of the linkage 50 has a second threaded portion 531, and the first threaded portion 201 of the pen tip 20 and the second threaded portion 531 of the linkage 50 are screwed together. Therefore, when the pen tip 20 is subjected to force and moves towards the interior of the hollow pen tube 10 (e.g. Figure 4 As indicated by arrow L1, it can synchronously drive the linkage 50 to move relative to the hollow pen tube 10. However, the above embodiment is only an example. In some embodiments, the pen tip 20 and the linkage 50 can also be connected by other means (such as snap-fit ​​or tight fit).

[0067] like Figures 2 to 4 As shown, a cantilever plate 30 is disposed inside the hollow pen tube 10. The cantilever plate 30 has a fixed side 31, a free side 32, and opposing first surfaces 33 and second surfaces 34. The fixed side 31 of the cantilever plate 30 is fixed to the hollow pen tube 10, while the free side 32 is not fixed. The first surface 33 and the second surface 34 are connected between the fixed side 31 and the free side 32, with the first surface 33 facing the open end 11 of the hollow pen tube 10 and the second surface 34 facing away from the open end 11. Thus, when the first surface 33 or the second surface 34 of the cantilever plate 30 is subjected to an external force, the cantilever plate 30 can swing and deform relative to the hollow pen tube 10 about the fixed side 31 as an axis. When the external force is released, the cantilever plate 30 returns to its original state of not swinging or deforming.

[0068] like Figures 2 to 4 As shown, the first strain electrode 41 is disposed on the first surface 33 of the cantilever plate 30, and the second strain electrode 42 is disposed on the second surface 34 of the cantilever plate 30. The first strain electrode 41 and the second strain electrode 42 can be conductive lines made of metallic materials (such as copper-nickel alloy, nickel-chromium alloy or copper). For example, in this embodiment, the conductive lines are wound to form a metal wire sensitive grid. When the cantilever plate 30 deforms, the first strain electrode 41 and the second strain electrode 42 can deform accordingly, causing the conductive lines to be stretched or compressed.

[0069] In some embodiments, the first strain electrode 41 and the second strain electrode 42 can be directly formed on the surface of the cantilever plate 30. For example, the first strain electrode 41 and the second strain electrode 42 can be formed on the first surface 33 and the second surface 34 of the cantilever plate 30 respectively by electroplating or etching. Alternatively, the first strain electrode 41 and the second strain electrode 42 can also be indirectly disposed on the first surface 33 and the second surface 34 of the cantilever plate 30 respectively via a substrate. For example, such as Figure 2 and Figure 4 As shown, in this embodiment, a first flexible sheet 45 is provided on the first surface 33 of the cantilever plate 30, and a second flexible sheet 46 is provided on the second surface 34 of the cantilever plate 30. The first flexible sheet 45 and the second flexible sheet 46 are made of flexible insulating material (e.g., insulating plastic), and can be adhesively bonded to the first surface 33 and the second surface 34 of the cantilever plate 30, respectively. The first strain electrode 41 can be located on the first flexible sheet 45, and the second strain electrode 42 can be located on the second flexible sheet 46, thus indirectly disposing the first strain electrode 41 and the second strain electrode 42 on the first surface 33 and the second surface 34 of the cantilever plate 30, respectively. Furthermore, based on the flexible characteristics of the first flexible sheet 45 and the second flexible sheet 46, when the cantilever plate 30 deforms, the first strain electrode 41, the second strain electrode 42, the first flexible sheet 45, and the second flexible sheet 46 can deform simultaneously.

[0070] Figure 5 This is an animated diagram illustrating the operation of the first embodiment of the stylus of the present invention. Figures 2 to 5 As shown, the linkage 50 is located between the pen tip 20 and the first surface 33 of the cantilever plate 30, and the second end 52 of the linkage 50 contacts the first surface 33 of the cantilever plate 30. In this embodiment, the second end 52 of the linkage 50 has a pressing plate 54, and the surface of the pressing plate 54 facing the cantilever plate 30 has a protrusion 541, which contacts the first surface 33 of the cantilever plate 30. In addition, the linkage 50 also has a plurality of connecting plates 55, which are integrally connected between the pressing plate 54 and the hollow column 53.

[0071] In this way, such as Figures 2 to 5 As shown, when the user operates the stylus 1 and places the stylus tip 20 against the touch surface of the electronic device, the stylus tip 20 can be pressed and drive the linkage 50 to move relative to the hollow pen tube 10 toward the cantilever plate 30 (e.g., Figure 4(In the direction indicated by arrow L1), the second end 52 of the linkage 50 pushes against the first surface 33 of the cantilever plate 30, thereby causing the cantilever plate 30 to deform, causing the first strain electrode 41 and the second strain electrode 42 to deform synchronously and generate a change in resistance value. The processor of the stylus 1 (not shown in the figure) is electrically connected to the first strain electrode 41 and the second strain electrode 42, and the processor can generate a corresponding touch signal according to the change in resistance value.

[0072] Furthermore, in this embodiment of the invention, the stylus 1 is provided with the first strain electrode 41 and the second strain electrode 42 respectively on the first surface 33 and the second surface 34 opposite to the cantilever plate 30. When the cantilever plate 30 deforms and simultaneously causes the first strain electrode 41 and the second strain electrode 42 to deform, one of the first strain electrode 41 and the second strain electrode 42 will be stretched and the other will be compressed, causing the resistance values ​​of the first strain electrode 41 and the second strain electrode 42 to change in opposite directions. That is, the resistance value of one of the first strain electrode 41 and the second strain electrode 42 will increase and the resistance value of the other will decrease, thereby generating a larger difference in resistance value.

[0073] For example, such as Figures 2 to 5 As shown, in this embodiment, when the cantilever plate 30 is pushed by the linkage 50, it bends and / or deforms in a direction away from the pen tip 20 (e.g., Figure 5As shown). If the strain electrodes (first strain electrode 41 and second strain electrode 42) are both disposed on the same surface of the cantilever plate 30 (such as the first surface 33 or the second surface 34), the first strain electrode 41 and the second strain electrode 42 will be stretched or compressed, causing the resistance value to rise or fall synchronously, resulting in little change in the resistance difference between the first strain electrode 41 and the second strain electrode 42 (i.e., the change in resistance value difference is small). In contrast, the first strain electrode 41 and the second strain electrode 42 of this embodiment are respectively disposed on the first surface 33 and the second surface 34 of the cantilever plate 30. Therefore, when the cantilever plate 30 is bent and / or deformed, the first strain electrode 41 will be stretched and its resistance value will increase, while the second strain electrode 42 will be compressed and its resistance value will decrease. That is to say, the resistance values ​​of the first strain electrode 41 and the second strain electrode 42 will show opposite changes, one positive and one negative. Compared with the above-mentioned placement of all strain electrodes on the same surface of the cantilever plate 30, the first strain electrode 41 and the second strain electrode 42 of this embodiment will produce a larger difference in resistance value after deformation (i.e., the resistance difference between the first strain electrode 41 and the second strain electrode 42 is larger), thereby improving the sensing sensitivity and simplifying the circuit design (e.g., no noise filtering circuit is required). Furthermore, due to the improved sensitivity of the sensor, the force required for user operation can be greatly reduced and the pen tip 20 of the stylus 1 can be prevented from shaking during operation, thus giving the stylus 1 a better operating feel.

[0074] Figure 6 This is a circuit diagram of a first embodiment of the stylus of the present invention. In some embodiments, the first strain electrode 41 and the second strain electrode 42 may be connected to an amplifier to further amplify the change in resistance value, thereby improving the accuracy of sensing. Figure 1 , Figure 2 and Figure 6As shown, in this embodiment, the stylus 1 includes a circuit board 60, which is disposed inside the hollow pen tube 10. The circuit board 60 has a sensing circuit C, which includes a first fixed resistor 61, a second fixed resistor 62, and an operational amplifier 63. The first strain electrode 41 and the first fixed resistor 61 are connected in series to form a first series circuit, and the second strain electrode 42 and the second fixed resistor 62 are connected in series to form a second series circuit. The first series circuit and the second series circuit are connected in parallel to form a Wheatstone bridge, thus the electrical connection between the first strain electrode 41 and the second strain electrode 42 is non-series. Furthermore, the first series circuit and the second series circuit are respectively connected to the two input terminals of the operational amplifier 63. When the first strain electrode 41 and the second strain electrode 42 deform, the resistance difference between them (i.e., the change in resistance value) can be further amplified by the operational amplifier 63, and the processor can generate a corresponding touch signal based on the amplified information. In addition, in some embodiments, the connection positions of the first strain electrode 41 and the first fixed resistor 61 can be interchanged, and the connection positions of the second strain electrode 42 and the second fixed resistor 62 can be interchanged, which can also form a Wheatstone bridge and achieve the aforementioned purpose of generating a larger resistance value difference.

[0075] Figure 7 This is a partial planar schematic diagram of the second embodiment of the stylus of the present invention. Figure 7 As shown, in another embodiment, the stylus 1 may further include a third strain electrode 43 and a fourth strain electrode 44. The third strain electrode 43 and the fourth strain electrode 44 may also be conductive lines made of metallic materials (such as copper-nickel alloy, nickel-chromium alloy, or copper). For example, in this embodiment, the conductive lines are wound to form a metal wire sensitive grid. The third strain electrode 43 and the fourth strain electrode 44 are respectively disposed on the first surface 33 and the second surface 34 of the cantilever plate 30. For example, in this embodiment, the first strain electrode 41 and the third strain electrode 43 are disposed on the first flexible sheet 45, and the second strain electrode 42 and the fourth strain electrode 44 are disposed on the second flexible sheet 46. In this way, when the cantilever plate 30 deforms, the first strain electrode 41, the second strain electrode 42, the third strain electrode 43, and the fourth strain electrode 44 can all deform synchronously. For example, the first strain electrode 41 and the third strain electrode 43 will be subjected to tensile deformation, which will increase the resistance value, while the second strain electrode 42 and the fourth strain electrode 44 will be subjected to compressive deformation, which will decrease the resistance value. This makes the difference between the total resistance value of the first strain electrode 41 and the third strain electrode 43 and the total resistance value of the second strain electrode 42 and the fourth strain electrode 44 larger, thereby generating a larger change in resistance value to improve the sensing sensitivity.

[0076] Figure 8This is a circuit diagram of a second embodiment of the stylus of the present invention. In some embodiments, the first strain electrode 41, the second strain electrode 42, the third strain electrode 43, and the fourth strain electrode 44 can also be connected to an amplifier to further amplify the change in resistance value, thereby improving the accuracy of sensing. Figure 8 As shown, in this embodiment, the first strain electrode 41 and the fourth strain electrode 44 are connected in series to form a first electrode group, and the second strain electrode 42 and the third strain electrode 43 are connected in series to form a second electrode group. The first electrode group and the second electrode group are connected in parallel to form a Wheatstone bridge, thus ensuring that the electrical connection between the first strain electrode 41 and the second strain electrode 42 is non-series, and the electrical connection between the fourth strain electrode 44 and the third strain electrode 43 is also non-series. Furthermore, the first electrode group and the second electrode group are respectively connected to the two input terminals of the operational amplifier 63. When the first strain electrode 41, the second strain electrode 42, the third strain electrode 43, and the fourth strain electrode 44 deform, the resistance difference between the four (i.e., the change in resistance value) can be further amplified by the operational amplifier 63, and the processor generates a corresponding touch signal based on the amplified information.

[0077] like Figure 5 As shown, in this embodiment, the protrusion 541 of the second end 52 of the linkage 50 contacts the first surface 33 of the cantilever plate 30 and is adjacent to the free side 32. Therefore, when the pen tip 20 is pressed and causes the linkage 50 to push against the cantilever plate 30, the protrusion 541 pushes against the cantilever plate 30, making it easier and resulting in a greater amount of deformation, thereby further reducing the force required for user operation.

[0078] like Figure 2 and Figure 4 As shown, the stylus 1 also includes a support plate 36, which is disposed inside the hollow pen tube 10 and connected to the linkage 50 and adjacent to the first end 51, so that the linkage 50 is supported and avoids shaking during operation. In this embodiment, the support plate 36 is a U-shaped plate with an opening groove 361. The area of ​​the linkage 50 adjacent to the first end 51 is accommodated in the opening groove 361, so that the support plate 36 can obtain a better limiting effect.

[0079] like Figure 2 and Figure 4As shown, the support plate 36 can be connected to the cantilever plate 30. In this embodiment, the hollow pen tube 10 has a fixing plate 37 inside. For example, the fixing plate 37 can be fixed to the inner wall of the hollow pen tube 10 by means of screwing, snap-fitting, or tight fitting. The fixing side 31 of the cantilever plate 30 is integrally connected to one end of the fixing plate 37, so that the fixing side 31 is fixed to the hollow pen tube 10. The support plate 36 is integrally connected to the other end of the fixing plate 37, so that the support plate 36 and the cantilever plate 30 are connected to each other through the fixing plate 37. In this way, by making the support plate 36, the fixing plate 37, and the cantilever plate 30 an integral structure, the assembly time can be effectively reduced. In some embodiments, the support plate 36, the fixing plate 37, and the cantilever plate 30 may not be an integral structure.

[0080] like Figure 3 As shown, in this embodiment, the first flexible sheet 45 and the second flexible sheet 46 are integrally connected by a bending piece 47, and the first flexible sheet 45, the second flexible sheet 46, and the circuit board 60 are also an integral structure, so that the first flexible sheet 45, the second flexible sheet 46, and the circuit board 60 are connected to each other before assembly, thereby making the assembly process easier. In some embodiments, the first flexible sheet 45, the second flexible sheet 46, and the bending piece 47 may not be integrally connected.

[0081] In some embodiments, the connection position or shape of the aforementioned bent piece 47 may be designed differently according to actual product requirements, which are explained below with reference to the accompanying drawings. Figure 2 and Figure 3 As shown, the first flexible sheet 45 has a first side 451, and the second flexible sheet 46 has a second side 461, with the first side 451 and the second side 461 adjacent to each other. A bending piece 47 is integrally connected to the first side 451 and the second side 461 and covers a partial area of ​​the side 301 of the cantilever plate 30, wherein the length of the bending piece 47 is equal to the length of the first side 451 and the second side 461.

[0082] Figure 9 This is a partial perspective view of the third embodiment of the stylus of the present invention. Figure 9 As shown, in this embodiment, the bending piece 47a is also integrally connected to the first side 451 of the first flexible piece 45 and the second side 461 of the second flexible piece 46. This embodiment is similar to the one described above. Figure 3 The difference in the embodiment is that the length of the bending piece 47a in this embodiment is less than the lengths of the first side 451 and the second side 461. This reduces the stress generated when the bending piece 47a is bent, which is beneficial to the assembly of the first flexible piece 45 and the second flexible piece 46.

[0083] Figure 10 This is a partial perspective view of the fourth embodiment of the stylus of the present invention. Figure 10As shown, in this embodiment, the bending piece 47b is also integrally connected to the first side 451 of the first flexible piece 45 and the second side 461 of the second flexible piece 46. This embodiment is similar to the one described above. Figure 3 The difference in the embodiment is that the bending piece 47b in this embodiment has at least one hollow portion 471b. By setting the hollow portion 471b, the stress generated by the bending piece 47b when bending can also be reduced, which is conducive to the assembly of the first flexible piece 45 and the second flexible piece 46.

[0084] Figure 11 This is a partial perspective view of the fifth embodiment of the stylus of the present invention. Figure 11 As shown, this embodiment is similar to the one described above. Figure 3 The difference in this embodiment is that the bending piece 47c is integrally connected to the side of the free side 32 of the cantilever plate 30 adjacent to the first flexible piece 45 and the second flexible piece 46, and the bending piece 47c covers at least a portion of the free side 32 of the cantilever plate 30. Therefore, during the assembly of the first flexible piece 45 and the second flexible piece 46 to the cantilever plate 30, the bending piece 47c can be placed correspondingly on the free side 32 of the cantilever plate 30, which quickly pre-positions the first flexible piece 45 and the second flexible piece 46, thus accelerating the assembly process.

[0085] Figure 12 This is a partial perspective view of the sixth embodiment of the stylus of the present invention. Figure 12 As shown, this embodiment is similar to the one described above. Figure 11 The difference in the embodiment is that the bent piece 47d in this embodiment has a hollow portion 471d, and one side of the cantilever plate 30 (here, the free side 32) has a protrusion 305. The protrusion 305 passes through the hollow portion 471d of the bent piece 47d, so that the first flexible piece 45 and the second flexible piece 46 can obtain a better positioning effect during the assembly process.

[0086] Figure 13 This is a partial perspective view of the seventh embodiment of the stylus of the present invention, as shown below. Figure 13 As shown, this embodiment is similar to the one described above. Figure 11 The difference in the embodiment is that one side (here, the free side 32) of the cantilever plate 30 has a groove 35. The bending piece 47e of this embodiment is accommodated in the groove 35 of the cantilever plate 30, which also allows the first flexible piece 45 and the second flexible piece 46 to achieve a better positioning effect during the assembly process.

[0087] The stylus of this invention has a first strain electrode and a second strain electrode, which are respectively disposed on opposite sides of a cantilever plate. Compared to only disposing of the strain electrode on one side of the cantilever plate, the first and second strain electrodes of this invention can generate a larger change in resistance value when deformed, thereby improving the sensing sensitivity. Furthermore, due to the improved sensing sensitivity, the force required for the user to operate the stylus can be reduced, giving the stylus of this invention a better tactile feel.

[0088] Although the technical content of the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications and refinements made by those skilled in the art without departing from the spirit of the present invention should be included within the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A stylus, characterized in that, include: Hollow pen tube with an open end; The pen tip is located at the opening end; A cantilever plate is disposed inside the hollow pen tube. The cantilever plate has a fixed side, a free side, and opposing first and second surfaces. The fixed side is fixed to the hollow pen tube, and the first surface faces the open end. A first strain electrode is disposed on the first surface of the cantilever plate; as well as The second strain electrode is disposed on the second surface of the cantilever plate; The pen tip can selectively move relative to the hollow pen tube to cause the cantilever plate to deform, so that the first strain electrode and the second strain electrode deform synchronously.

2. The stylus as described in claim 1, characterized in that, It also includes a linkage that is movably disposed inside the hollow pen tube. The linkage has a first end and a second end that are opposite each other. The first end is connected to the pen tip, and the second end has a protrusion that contacts the first surface of the cantilever plate and is adjacent to the free side.

3. The stylus as described in claim 1, characterized in that, When the first strain electrode and the second strain electrode deform, the resistance of one of the first strain electrode and the resistance of the second strain electrode increases, while the resistance of the other decreases.

4. The stylus as described in claim 1, characterized in that, It also includes a circuit board having a sensing circuit having a first fixed resistor and a second fixed resistor, the first strain electrode and the first fixed resistor being connected in series to form a first series circuit, the second strain electrode and the second fixed resistor being connected in series to form a second series circuit, and the first series circuit and the second series circuit being connected in parallel.

5. The stylus as described in claim 1, characterized in that, It also includes a third strain electrode and a fourth strain electrode, which are respectively disposed on the first surface and the second surface; when the cantilever plate deforms, the third strain electrode and the fourth strain electrode deform synchronously.

6. The stylus as described in claim 5, characterized in that, The first strain electrode and the fourth strain electrode are connected in series to form a first electrode group, the second strain electrode and the third strain electrode are connected in series to form a second electrode group, and the first electrode group and the second electrode group are connected in parallel.

7. The stylus as described in claim 1, characterized in that, The first surface of the cantilever plate is provided with a first flexible sheet, the second surface is provided with a second flexible sheet, the first strain electrode is located on the first flexible sheet, and the second strain electrode is located on the second flexible sheet.

8. The stylus as described in claim 7, characterized in that, The first flexible sheet and the second flexible sheet are integrally connected as a bending sheet.

9. The stylus as described in claim 8, characterized in that, The cantilever plate has a groove on one side, and the bent piece is accommodated in the groove.

10. The stylus as described in claim 8, characterized in that, The bending piece covers at least a portion of the free side of the cantilever plate.

11. The stylus as described in claim 8, characterized in that, The bent piece has a hollowed-out section.

12. The stylus as described in claim 11, characterized in that, The cantilever plate has a protruding plate on one side, which inserts into the hollow part of the bent piece.

13. The stylus as described in claim 1, characterized in that, It also includes a linkage that is movably disposed inside the hollow pen tube and located between the pen tip and the cantilever plate. The linkage has a first end and a second end opposite to each other. The first end is connected to the pen tip, and the second end contacts the first surface of the cantilever plate.

14. The stylus as described in claim 13, characterized in that, It also includes a support plate disposed inside the hollow pen tube, and the support plate is connected to the linkage and adjacent to the first end of the linkage connected to the pen tip.

15. The stylus as described in claim 14, characterized in that, The support plate is connected to the cantilever plate.

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