stylus

Abstract

This invention provides a stylus, comprising: a pen refill having a writing end and a fixed end; a push rod for receiving and fixing the fixed end; and a pressure sensing component adjacent to the push rod for sensing writing pressure of the writing end under the push of the push rod. The push rod includes a clamping portion for clamping the fixed end, the clamping portion including: an inner space, a front opening and a rear opening communicating with the inner space, a plurality of protrusions distributed in a direction surrounding the central axis of the inner space, and clearance portions located between adjacent protrusions. The central axis passes through the front opening and the rear opening, and the plurality of protrusions cooperate to clamp and fix the fixed end. The push rod also includes an actuating portion, the actuating portion being connected to the rear end of the clamping portion and opposite to the rear opening, the actuating portion abutting against the fixed end. This invention improves the stability of the stylus.

Description

Technical Field

[0001] This utility model relates to the field of computer peripheral equipment technology, and in particular to a stylus. Background Technology

[0002] Digital electronic information devices have a trajectory input function, which can be achieved through handwriting input. Pressure-capacitive styluses are widely used in digital electronic information devices, enabling not only handwriting input of text but also drawing and point-control operations.

[0003] In existing styluses, the pen tip is fixed circumferentially by a push rod. The writing pressure on the pen tip is transmitted to the pressure sensing component located behind the push rod. However, due to the current design of the push rod, if the manufacturing error of the pen tip is large, the tightness of inserting and removing the pen tip in different directions of circumferential rotation will vary considerably, and the clamping of the pen tip will be unstable. In addition, if the push rod is misaligned or off-axis, it will cause relative translation or offset between the components within the pressure sensing component, resulting in inaccurate pressure sensing and affecting the stability of the product.

[0004] Therefore, there is an urgent need to provide a new stylus to solve one or more of the aforementioned technical problems. Utility Model Content

[0005] In order to solve at least one of the above problems, this utility model provides a stylus.

[0006] A stylus, comprising:

[0007] The pen refill has a writing end and a fixing end;

[0008] Top rod, the top rod receiving and fixing the fixed end; and

[0009] A pressure-sensing component, disposed adjacent to the push rod, is used to sense the writing pressure of the writing end when the push rod is pushed.

[0010] The push rod includes:

[0011] The clamping part clamps and fixes the fixed end, and the clamping part includes:

[0012] Inner space;

[0013] The front opening connects to the inner space;

[0014] The rear opening connects to the inner space;

[0015] A plurality of protrusions are distributed along a central axis surrounding the inner space, the central axis passing through the front opening and the rear opening, the plurality of protrusions cooperating to clamp and fix the fixed end; and

[0016] The clearance portion located between adjacent protrusions; and

[0017] The function part is connected to the rear end of the clamping part and is opposite to the rear end opening, and the function part abuts against the fixed end.

[0018] In one embodiment, the actuating part includes a front side and a rear side, the front side facing the rear opening and abutting the fixed end, and the rear side having an arcuate surface that contacts the front side of the pressure sensing component to push against the pressure sensing component.

[0019] In one embodiment, the front side of the pressure sensing component is a plane, and the arcuate surface is tangent to the front side of the pressure sensing component when they come into contact.

[0020] In one embodiment, the pressure sensing component includes a conductive base, an FPC flexible flat cable, a conductive silicone component, a capacitor, a first circuit board, and an elastic element. When the arc-shaped surface contacts the front side of the conductive base, the two are tangent. The rear end of the conductive base has a receiving space to accommodate the conductive silicone component. One end of the FPC flexible flat cable is clamped between the conductive base and the conductive silicone component, and the other end is connected to a second circuit board. The rear end of the conductive silicone component is opposite to the capacitor. The capacitor is electrically connected to the first circuit board and then connected to the second circuit board through the first circuit board. The elastic element abuts against the conductive base and provides power for the conductive base to reset.

[0021] In one embodiment, the stylus further includes a seat assembly, which includes a detachably connected front compartment and a rear compartment. The front compartment has a partition wall, and the push rod and the pressure sensing component are housed in the rear compartment. The front end of the push rod extends from the rear compartment and abuts against the partition wall.

[0022] In one embodiment, the cockpit assembly further includes a cockpit that is received and fixed to the rear cockpit, a partition wall is provided inside the cockpit, and the capacitor is located inside the cockpit and on one side of the partition wall of the cockpit.

[0023] In one embodiment, the two ends of the elastic member abut against the spacer wall of the conductive base and the housing, respectively.

[0024] In one embodiment, both the rear compartment and the sidewall of the conductive base are provided with openings, and the other end of the FPC flexible flat cable passes through the openings in sequence to connect to the second circuit board.

[0025] In one embodiment, the cross-section of each of the protrusions is arc-shaped in a direction perpendicular to the central axis.

[0026] In one embodiment, each of the protrusions extends from the front opening to the rear opening, and / or the extension direction of each of the protrusions is parallel to the central axis.

[0027] Compared to existing technologies, the stylus provided in this embodiment features a top rod with protrusions and clearances spaced apart along its central axis. When the protrusions hold the pen refill, the force on each protrusion is more balanced, resulting in a more stable grip on the refill. This also prevents uneven tightness when inserting or removing the refill in different directions around its circumference and reduces the precision requirements for refill manufacturing. Furthermore, by making the contact surface between the top rod and the conductive base tangent to the contact surface on the conductive base, the top rod always applies force to the conductive base through a single point on the arc-shaped surface when the pen refill receives writing pressure. This avoids relative translation or offset of components within the pressure sensing assembly and the resulting inaccurate pressure sensing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0029] Figure 1 This is a three-dimensional schematic diagram of the stylus after removing the outer shell according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 An exploded view of the stylus shown.

[0031] Figure 3 yes Figure 1 The stylus shown is a cross-sectional view and a magnified view of a portion thereof;

[0032] Figure 4 yes Figure 2 A three-dimensional structural diagram and an exploded view of the stylus's housing assembly;

[0033] Figure 5 yes Figure 2 A three-dimensional structural diagram of the top rod of the stylus shown;

[0034] Figure 6 yes Figure 5 A schematic diagram showing the connection between the push rod and the pen refill in the push rod assembly shown.

[0035] Figure 7 yes Figure 2 The diagram shows a three-dimensional structural schematic and an exploded view of the pressure sensing component. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0037] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a three-dimensional schematic diagram of the stylus of this utility model after removing the outer shell in one embodiment. Figure 2 yes Figure 1 The diagram shows an exploded view of the stylus. The stylus 10 includes a housing (not shown), a pen tip 12, a magnetic core assembly 13, a fixing assembly 14, a pressure sensing assembly 15, and a circuit board 17. The housing has an internal receiving space to accommodate the pen tip 12, the magnetic core assembly 13, the fixing assembly 14, the pressure sensing assembly 15, and the circuit board 17.

[0038] Please refer to the reference. Figure 2 and Figure 3 The pen refill 12 includes a writing end 121 and a fixed end 123. In this embodiment, the direction extending from the writing end 121 to the fixed end 123 is defined as the direction of extension of the pen refill 12, which is substantially parallel to or overlaps with the axial direction of the stylus 10. This specification uses the direction of extension of the pen refill 12 to define the front and rear ends of the stylus 10, the front and rear ends of each component, and the front-rear positional relationship of each component. Specifically, for example, for the pen refill 12, the writing end 121 is the front and the fixed end 123 is the rear, and the front-rear direction of the stylus 10 as a whole and its components is defined with reference to the front-rear direction of the pen refill 12. The pen refill 12 can be replaced from the writing end 121 by plugging and unplugging. The fixed end 123 passes through the magnetic core assembly 13 and is fixed to the fixing assembly 14.

[0039] The magnetic core assembly 13 includes a magnetic core 131, an induction coil 133, and a silicone sheath 135. The magnetic core 131 has a first through hole, and the induction coil 133 is wound around the outer surface of the magnetic core 131. The silicone sheath 135 has a second through hole, and the silicone sheath 135 is fitted onto the rear end of the magnetic core 131 through the second through hole and fixedly housed in the fixing assembly 14, abutting against the spacer wall 14115 inside the fixing assembly 14. The fixing end 123 passes through the first and second through holes, penetrating the magnetic core 131 and the silicone sheath 135, and is then fixed to the fixing assembly 14.

[0040] The fixed assembly 14 includes a cockpit assembly 141 and a push rod 143, the push rod 143 being housed in the cockpit assembly 141.

[0041] Please refer to Figure 4 , Figure 4 Part (a) is an exploded view of the cockpit assembly 141. Figure 4 Part (b) is a three-dimensional structural diagram of the cockpit assembly 141. In this embodiment, the cockpit assembly 141 includes a front cockpit 1411, a rear cockpit 1413, and a seat 1415. The front cockpit 1411 and the rear cockpit 1413 are detachably connected, and the seat 1415 is disposed within the rear cockpit 1413. The components of the pressure sensing assembly 15 are housed within the rear cockpit 1413 and the seat 1415.

[0042] The front compartment 1411 has a cylindrical structure with openings at both its front and rear ends, distributed along the extension direction of the pen refill. The front compartment 1411 includes a side wall 14110 and a partition wall 14115 disposed inside the front compartment 1411. The partition wall 14115 divides the front compartment 1411 into a first receiving space 14114 and a second receiving space 14116, both distributed along the extension direction of the pen refill. The inner surface of the side wall 14110, at the end away from the writing end 121, is provided with an internal thread 14113. A connecting hole 14112 is provided on the partition wall 14115. The partition wall 14115 and the side wall 14110 enclose the first receiving space 14114 on the side closer to the writing end 121, and the partition wall 14115 and the side wall 14110 enclose the second receiving space 14116 on the side away from the writing end 121. The connecting hole 14112 connects the first receiving space 14114 and the second receiving space 14116.

[0043] The rear compartment 1413 has a cylindrical structure with openings at both its front and rear ends along the extension direction of the pen refill. The rear compartment 1413 includes a front portion 14131 that mates with the front compartment 1411 and a rear portion 14132 located behind the front portion 14131. The outer side wall of the front portion 14131 has external threads, and the front portion 14131 extends into the second receiving space 14116 of the front compartment 1411. The external threads mate with the internal threads 14113 of the front compartment 1411, assembling the front compartment 1411 and the rear compartment 1413 into a detachable unit. The side wall of the rear portion 14132 has an opening 14133 and multiple engaging structures.

[0044] It is understood that in other embodiments, the front compartment 1411 is provided with an external thread, and the rear compartment is provided with an internal thread that mates with the external thread on the front compartment 1411. Alternatively, the front compartment 1411 and the rear compartment 1413 are connected in other ways, such as by a snap-fit ​​connection, to form a detachable whole.

[0045] The seat compartment 1415 is disposed within the rear compartment 1413. Specifically, in one embodiment, the seat compartment is engaged with the rear compartment via a locking structure on the rear compartment. The seat compartment 1415 has a cylindrical structure with openings at both its front and rear ends along the extension direction of the pen refill 12. A partition wall 14151 is provided inside the seat compartment 1415. The partition wall 1415 divides the seat compartment 1415 into a first accommodating space 14152 and a second accommodating space 14153 distributed along the extension direction of the pen refill 12. The first accommodating space 14152 is closer to the front compartment 1411, and the second accommodating space 14153 is distributed further away from the front compartment 1411.

[0046] Please see Figure 1-3 As shown, the push rod 143 is adjacent to the conductive seat 151 in the pressure sensing assembly 15. Both the push rod 143 and the pressure sensing assembly 15 are housed within the seat assembly 141. More specifically, the push rod 143 is partially housed within the rear compartment 1413, and the entire pressure sensing assembly 15 is housed within the rear compartment 1413, with the rear end of the pressure sensing assembly 15 partially housed within the seat compartment 1415. The conductive seat 151 is made of a rigid material. The push rod 143 and the conductive seat 151 are in a separated state. The push rod 143 can move to abut against, push against, or move away from the conductive seat 151. That is, apart from the push rod 143 abutting against and pushing the conductive seat 151 in one direction, the push rod 143 and the conductive seat 151 do not have any other substantial connection, and neither has any structure or construction that allows them to engage, screw together, attract, fix, or restrict each other.

[0047] Please see Figure 5 and Figure 6 As shown, Figure 5 This is a 3D schematic diagram of the push rod 143. Figure 6 This is a schematic diagram showing the engagement of the push rod 143 and the pen refill 12. In this embodiment, the push rod 143 is a plastic push rod; in other embodiments, the push rod 143 can also be a push rod made of other materials, such as silicone. The push rod 143 is housed in the second receiving space 14116.

[0048] The push rod 143 includes a clamping part 1431 and an actuating part 1433 connected to the clamping part 1431. The clamping part 1431 and the actuating part 1433 are distributed along the direction of extension of the pen refill 12. The clamping part 1431 clamps and fixes the fixed end 123 of the pen refill 12, and the actuating part 1433 abuts against and pushes the conductive base 151 to move when moving. The clamping part 1431 is cylindrical and has openings at both ends along the direction of extension of the pen refill 12. The actuating part 1433 is connected to the rear end of the clamping part 1431 and is opposite to the opening at the rear end. Furthermore, the actuating part 1433 covers the opening at the rear end. The clamping part 1431 has an inner space 14311 for the pen refill 12 to pass through. The inner space 14311 connects to the openings at both ends of the clamping part 1431 and has a central axis 14312, which or its extension passes through the openings at both ends of the clamping part 1431. The inner wall of the clamping part 1431 has multiple protrusions 14313 that protrude towards the inner space 14312. These protrusions 14313 are distributed around the central axis 14312, and the distribution can be uniform, symmetrical, asymmetrical, and / or non-uniform. In one embodiment, the protrusions 14313 extend from the front opening of the clamping part 1431 to the rear opening. The extension direction of the protrusions 14313 can be parallel to the central axis 14312 or form an angle with the central axis 14312. In another embodiment, the protrusion 14313 extends rearward from the front opening of the clamping portion 1431 but terminates before the rear opening. In another embodiment, the protrusion 14313 begins after the front opening of the clamping portion 1431 and ends at or before the rear opening. In yet another embodiment, from the front opening to the rear opening of the clamping portion 1431, some of the protrusions 14313 are positioned forward and some are positioned backward. In short, the distribution of the protrusions 14313 is not limited except that they need to be distributed around the central axis.

[0049] Please also refer to Figure 5 and Figure 6In the direction surrounding the central axis 14312, there is also a clearance portion 14314 between the protrusions 14313. After the pen refill 12 is inserted into the push rod 143, the protrusions 14313 abut against the outer periphery of the pen refill 12 to limit the pen refill 12 in the circumferential direction. In the direction perpendicular to the central axis 14312, the cross-section of the protrusion 14313 is arc-shaped, or at least, the portion of the protrusion 14313 that contacts the pen refill 12 is arc-shaped. The clearance portion 14314 provides clearance space for the pen refill 12. The clearance portion 14314 solves the problem that if the cylindricity error of the pen refill 12 is large, causing the pen refill 12 to be elliptical or other non-cylindrical, after the pen refill 12 is inserted into the push rod 143, the protrusion 14313 and the clearance portion 14314 are spaced apart, and the point with the largest diameter of the pen refill 12 will automatically slide toward the clearance portion 14314. This makes the force on the protrusion 143113 that holds the pen refill 12 more balanced and the clamping of the pen refill 12 more stable. It also avoids the different tightness when the pen refill 12 is inserted and pulled in different directions around the circumference of the pen refill 12. In addition, by setting the protrusion 14313 and the clearance portion 14314 around the central axis 14312, the manufacturing precision requirements of the pen refill 12 can be reduced, and it can accommodate larger pen refill manufacturing dimensional errors.

[0050] The outer side of the clamping part 1431 is cylindrical or frustum-shaped. In this embodiment, the diameter of the front end of the outer side of the clamping part 1431 is slightly larger than the diameter of the rear end. After the front compartment 1411 and the rear compartment 1413 are assembled into one unit, the push rod 143 is housed in the rear compartment 1413, and the front end of the push rod 143 extends out of the rear compartment 1413 to abut against the partition wall 14115 of the front compartment 1411.

[0051] The actuating part 1433 has a front side and a rear side. The front side opens towards the rear end of the clamping part 1431 and is planar. After the pen refill 12 is inserted into the push rod 143, the end of its fixed end 123 abuts against the front side of the actuating part 1433. The rear side of the actuating part 1433 away from the clamping part 1431 is a rearwardly convex arc shape, or at least the central part of the rear side is a rearwardly convex arc shape. That is, the actuating part 1433 has a rearwardly convex arc surface 14331 on its rear side. The front side of the conductive seat 151 facing the push rod 143 is planar. After the push rod 143 abuts against the conductive seat 151, only the arc surface 14331 of the push rod 143 contacts the front side of the conductive seat 151, and the arc surface 14331 is tangent to the front side of the conductive seat 151. When writing with the stylus 10, the pressure on the pen tip 10 is transmitted to the push rod 143, and then the push rod 143 acts on the conductive base 151. Since the push rod 143 abuts against the conductive base 151 through the arc-shaped surface 14331, and the arc-shaped surface 14331 is tangent to the conductive base 151, the push rod 143 always applies force to the conductive base 151 through a point on the arc-shaped surface 14331. Even if there are manufacturing and / or assembly errors that cause the push rod 143 to be skewed or not coaxial with the pen tip 12 on the front side or the pressure sensing component 15 on the rear side, it will not cause relative translation or offset of the components within the pressure sensing component 15, thus avoiding inaccurate pressure sensing caused by relative translation or offset of the components within the pressure sensing component 15.

[0052] Please see Figure 7 As shown, Figure 7 Part (a) is an exploded view of the pressure sensing component 15. Figure 7Part (b) is a three-dimensional structural schematic diagram of the pressure sensing component 15. In this embodiment, the pressure sensing component 15 includes a conductive base 151, a conductive silicone element 152, an FPC (Flexible Printed Circuit) cable 153, a capacitor 154, a circuit board 157, and an elastic element 159. The conductive base 151 may be a metal base. The capacitor 154 may be a ceramic capacitor or other types of capacitors, such as surface mount capacitors. For ease of distinction, the circuit board 157 is referred to as "first circuit board 157" and the circuit board 17 is referred to as "second circuit board 17" below. The conductive base 151 is housed in the rear compartment 1413, and the conductive base 151 has a receiving space 1511 at its rear end, which penetrates the rear end face of the conductive base 151, and the receiving space 1511 has an opening 1512 on the side wall of the conductive base 151. The front end of the conductive silicone element 152 is housed in the receiving space 1511, and the rear end is located outside the receiving space 1511 opposite to the capacitor 154. One end of the FPC flexible flat cable 153 is clamped between the conductive base 151 and the conductive silicone component 152, and the other end extends successively from the opening 1512 on the side wall of the conductive base 151 and the opening 14133 on the side wall of the rear compartment 1413, extending rearward and finally fixed to the solder pad of the second circuit board 17, forming an electrical connection with the second circuit board 17. One end of the second circuit board 17 is engaged with the rear compartment 1413.

[0053] The capacitor 154 is fixed to the first circuit board 157 via solder pads, forming an electrical connection with the first circuit board 157. The capacitor 154 is located within the second accommodating space 14153 of the seat compartment 1415. The first circuit board 157 is installed within the rear compartment 1413. Specifically, the first circuit board 157 is engaged within the rear compartment 1413 via a snap-fit ​​structure (e.g., an opening) on ​​the rear compartment 1413. The rear end of the conductive silicone element 152 is accommodated within the first accommodating space 14152 of the seat compartment 1415. One end of the elastic element 159 abuts against the conductive base 151, and the other end abuts against the partition wall 14152 within the seat compartment 1415, providing power for the reset of the conductive base 151.

[0054] The conductive silicone element 151 includes an elastic protrusion 1513, which is located at the rear end of the conductive silicone element 151 and faces the capacitor 154.

[0055] One end of the elastic element 159 is abutted against the conductive base 151, and the other end is abutted against the partition wall 14152 of the seat 1415. In this embodiment, the elastic element 159 does not conduct any circuit, that is, the elastic element 159 does not constitute part of any circuit inside the stylus 10.

[0056] When writing with the stylus 10, the writing end 121 is subjected to pressure. As the pressure gradually increases, the fixed end 123 pushes the push rod 143 towards the capacitor 154. The conductive base 151 is pushed, causing the conductive silicone part 152 to move towards the capacitor 154. At the same time, the elastic part 159 is compressed. The elastic protrusion 1523 of the conductive silicone part 152 squeezes the capacitor 154 and deforms, gradually increasing the contact area with the capacitor 154, thereby changing the capacitance value of the capacitor 154. When the writing force decreases or is removed, the pressure on the writing end 121 decreases, and the elastic force of the elastic part 159 is greater than the pressure. At this time, the elastic part provides power for the return of the conductive base 151, pushing the conductive base 151 towards the writing end 121. The conductive base 151 and the conductive silicone part 152 are tightly fitted. The return of the conductive base 151 causes the conductive silicone part 152 and the push rod 143 to return to their original positions. The return of the push rod 143 causes the pen tip 12 to return to its original position.

[0057] Compared to existing technologies, the stylus provided in this embodiment features a top rod with protrusions and clearances spaced apart along its central axis. When the protrusions abut against the pen refill, the force on each protrusion is more balanced, resulting in a more stable grip on the pen refill. This also prevents uneven tightness when inserting or removing the pen refill in different directions around its circumference and reduces the precision requirements for pen refill manufacturing. Furthermore, by making the surface of the top rod that contacts the conductive base arc-shaped, tangent to the contact surface on the conductive base, the top rod always applies force to the conductive base through a single point on the arc-shaped surface when the pen refill receives writing pressure. This avoids relative translation or offset of components within the pressure sensing assembly and the resulting inaccurate pressure sensing.

[0058] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A stylus, characterized in that, include: The pen refill has a writing end and a fixing end; Top rod, which receives and fixes the fixed end; and A pressure-sensing component, disposed adjacent to the push rod, is used to sense the writing pressure of the writing end when the push rod is pushed. The push rod includes: The clamping part clamps and fixes the fixed end, and the clamping part includes: Inner space; The front opening connects to the inner space. The rear opening connects to the inner space. A plurality of protrusions are distributed along a central axis surrounding the inner space, the central axis passing through the front opening and the rear opening, the plurality of protrusions cooperating to clamp and fix the fixed end; and The clearance portion located between adjacent protrusions; and The function part is connected to the rear end of the clamping part and is opposite to the rear end opening, and the function part abuts against the fixed end.

2. The stylus according to claim 1, characterized in that, The actuating part includes a front side and a rear side. The front side faces the rear opening and abuts against the fixed end. The rear side has an arc-shaped surface, which contacts the front side of the pressure sensing component to push against the pressure sensing component.

3. The stylus according to claim 2, characterized in that, The front side of the pressure sensing component is a plane, and the arc-shaped surface is tangent to the front side of the pressure sensing component when they come into contact.

4. The stylus according to claim 3, characterized in that, The pressure sensing component includes a conductive base, an FPC flexible flat cable, a conductive silicone component, a capacitor, a first circuit board, and an elastic element. When the arc-shaped surface contacts the front side of the conductive base, the two are tangent. The rear end of the conductive base has a receiving space to accommodate the conductive silicone component. One end of the FPC flexible flat cable is clamped between the conductive base and the conductive silicone component, and the other end is connected to a second circuit board. The rear end of the conductive silicone component is opposite to the capacitor. The capacitor is electrically connected to the first circuit board and then connected to the second circuit board through the first circuit board. The elastic element abuts against the conductive base and provides power for the conductive base to reset.

5. The stylus according to claim 4, characterized in that, It also includes a cockpit assembly, which includes a detachably connected front cockpit and a rear cockpit. The front cockpit has a partition wall, and the push rod and the pressure sensing component are housed in the rear cockpit. The front end of the push rod extends from the rear cockpit and abuts against the partition wall.

6. The stylus according to claim 5, characterized in that, The cockpit assembly also includes a cockpit, which is housed and fixed to the rear compartment. A partition wall is provided inside the cockpit, and the capacitor is located inside the cockpit and on one side of the partition wall.

7. The stylus according to claim 6, characterized in that, The two ends of the elastic element abut against the spacer wall between the conductive base and the housing, respectively.

8. The stylus according to claim 5, characterized in that, Both the rear compartment and the side wall of the conductive base have openings, and the other end of the FPC flexible cable passes through the openings to connect to the second circuit board.

9. The stylus according to claim 1, characterized in that, In a direction perpendicular to the central axis, the cross-section of each of the protrusions is arc-shaped.

10. The stylus according to claim 1, characterized in that, Each of the protrusions extends from the front opening to the rear opening, and / or the extension direction of each of the protrusions is parallel to the central axis.

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