Handwriting pen

Abstract

The utility model provides a handwriting pen which comprises a capacitor and a first circuit board, the capacitor comprises a first electrode and a second electrode which are oppositely arranged, and the first electrode is fixed on the first circuit board and electrically connected with the first circuit board. A first electrode is arranged on the first circuit board, a metal coating is arranged on the first electrode, a bonding pad is correspondingly arranged on the first circuit board, and the metal coating and the bonding pad are connected, fixed and electrically connected through welding, so that the capacitor is fixed on the first circuit board and electrically connected with the first circuit board. The handwriting pen is simple in structure, easy to install, good in stability of mechanical connection and electric connection and high in sensitivity.

Description

Technical Field

[0001] The utility model relates to the technical field of computer peripheral equipment, in particular to a stylus pen. Background Art

[0002] Digital electronic information devices have the function of trajectory input, which can be implemented through handwriting input. Pressure capacitive stylus pens are widely used in digital electronic information devices. They can not only input text through handwriting, but also realize drawing and point control operations.

[0003] The ceramic pressure capacitors and chip capacitors of existing styluses require separate leads for the two electrodes to be led out to the circuit board, which are then connected by welding. The leads are thin and long, or one end of a conductive elastic member or conductive sheet is welded to the circuit board, and the two electrodes are connected to each other in combination with a conductive elastic body. The conductive contact area is small, making it difficult to manufacture and assemble, and it is easy to damage. The stability and reliability of signal transmission are low.

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

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

[0006] A stylus pen with a refill, comprising:

[0007] A capacitor comprising a first electrode and a second electrode disposed opposite to each other;

[0008] a first circuit board, wherein the first electrode is fixed to the first circuit board and electrically connected to the first circuit board;

[0009] Among them, a metal coating is provided on the first electrode, and a soldering pad is correspondingly provided on the first circuit board. The metal coating and the soldering pad are connected and fixed and electrically connected by welding to fix the capacitor to the first circuit board and electrically connect the first circuit board.

[0010] In one embodiment, the first electrode and the first circuit board are further connected and fixed via colloid.

[0011] In one embodiment, the periphery of the first electrode is fixedly connected to the first circuit board via the colloid.

[0012] In one embodiment, the stylus further includes a second circuit board, which is disposed on a side of the first circuit board away from the capacitor and has a conductive path with the first circuit board.

[0013] In one embodiment, a via is provided on the first circuit board, the via is a through hole, the via is located in an outer area of ​​the pad, and electrical connections are formed between the pad and the via, and between the via and the second circuit board through conductive lines.

[0014] In one embodiment, the number of the via holes is two or more, and the via holes are distributed on both sides of the pad.

[0015] In one embodiment, the pads, the conductive circuits distributed on two opposite surfaces of the first circuit board, and the inner wall of the via hole are interconnected to form a whole.

[0016] In one embodiment, the pads, the conductive circuits distributed on two opposite surfaces of the first circuit board, and the inner wall of the via hole are formed from the same metal layer.

[0017] In one embodiment, a surface of the first circuit board opposite to the capacitor includes a central area and a peripheral area surrounding the central area, and the conductive circuit located on the surface is located in the peripheral area.

[0018] In one embodiment, the first circuit board extends outwardly with two ears, the two ears are located in the peripheral area, and the two ears are fixed to the second circuit board by welding to form an electrical connection, so as to fix the first circuit board to the second circuit board and form an electrical connection with the second circuit board.

[0019] Compared with the prior art, the stylus provided in the embodiment of the present invention enhances the stability of the mechanical and electrical connections between the ceramic capacitor and the circuit board by welding, gluing and / or adding a conductive path, resulting in good stability, high reliability and a better writing experience for the stylus.

[0020] At the same time, the elastic member in the stylus of the present invention only needs to abut against the first circuit board and the fixing member and only serves as a reset element, so that the stylus has a simple structure, is easy to manufacture and assemble, and is not easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0022] Figure 1 This is a three-dimensional schematic diagram of the stylus of the embodiment of the utility model with the outer shell removed;

[0023] Figure 2 yes Figure 1 An exploded schematic diagram of the stylus shown;

[0024] Figure 3 yes Figure 1 A cross-sectional view and a partially enlarged view of the stylus shown;

[0025] Figure 4 yes Figure 2 Exploded analysis diagram of the magnetic core, silicone sheath, housing and ejector pin;

[0026] Figure 5 yes Figure 2 An exploded schematic diagram of the fixing assembly shown;

[0027] Figure 6 yes Figure 2 A schematic diagram of the three-dimensional structure of the pressure sensing component shown;

[0028] Figure 7 yes Figure 2 A schematic diagram of the three-dimensional structure of the first circuit board is shown;

[0029] Figure 8 yes Figure 2 A schematic diagram and a partial enlarged view of the bracket at another angle;

[0030] Figure 9 yes Figure 2 A partial enlarged view of the second circuit board is shown.

[0031] Figure 10 yes Figure 2 The figure shows a three-dimensional diagram of the ceramic capacitor and the first circuit board at an angle.

[0032] Figure 11 yes Figure 2 A three-dimensional schematic diagram of the ceramic capacitor and the first circuit board from another angle is shown. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Please refer to Figure 1 and Figure 2 , Figure 1 This is a three-dimensional schematic diagram of the stylus of the utility model after removing the outer shell in one embodiment. Figure 2 yes Figure 1The stylus 10 includes a housing (not shown), a refill 12, a magnetic core assembly 13, a fixing assembly 14, a pressure sensing assembly 15, a bracket 16, and a circuit board 17. The housing defines a receiving space for the refill 12, the magnetic core assembly 13, the fixing assembly 14, the pressure sensing assembly 15, the bracket 16, and the circuit board 17.

[0035] Please refer to Figure 2 and Figure 3 The 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 or vice versa is defined as the extension direction of the refill 12. This direction is substantially parallel to or overlaps with the axial direction of the stylus 10. The refill 12 can be replaced by plugging and unplugging from the writing end 121. The fixed end 123 extends through the magnetic core assembly 13 and is fixed to the fixed assembly 14.

[0036] Please refer to Figure 4 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. The silicone sheath 135 is sleeved over the end of the magnetic core 131 near the fixed end 123 of the pen refill 12 through the second through-hole and is fixedly received in the fixing assembly 14 and abutted against the fixing assembly 14. The fixed end 123 passes through the first and second through-holes through the magnetic core 131 and the silicone sheath 135 and is fixed to the fixing assembly 14.

[0037] Please refer to Figure 5 , Figure 5 yes Figure 2 The fixing assembly 14 comprises a seat 141 and a push rod assembly 143 , wherein the seat 141 accommodates a portion of the push rod assembly 143 .

[0038] In this embodiment, the housing 141 is generally cylindrical in structure, with openings at both ends. The housing 141 includes a sidewall 1411 and a partition wall 1415 disposed within the housing 141. The partition wall 1415 divides the housing 141 into a first receiving space 1414 and a second receiving space 1416, which are distributed along the extension of the lead. The sidewall 1411 is cylindrical in shape, and an external thread 1413 is provided on the outer surface of the end of the sidewall 1411 away from the writing end 121. A connecting hole 1412 is defined in the partition wall 1415. The partition wall 1415 and the sidewall 1411 enclose the first receiving space 1414 on the side closest to the writing end 121, and the partition wall 1415 and the sidewall 1411 enclose the second receiving space 1416 on the side away from the writing end 121. The connecting hole 1412 connects the first receiving space 1414 and the second receiving space 1416.

[0039] The push rod assembly 143 includes a push rod 1431 and a fixing member 1433. In this embodiment, the push rod 1431 is a plastic push rod. In other embodiments, the push rod 1431 can also be made of other materials, such as silicone. The push rod 1431 is received in the second receiving space 1416 and fixes the fixing member 1433 away from the pressure sensing component 15.

[0040] The ejector pin 1431 includes a clamping portion 14311 and a limiting ring 14313 connected to the clamping portion 14311. The clamping portion 14311 and the limiting ring 14313 are distributed along the extending direction of the refill 12. The clamping portion 14311 clamps and fixes the fixed end 123 of the refill 12, and a limiting protrusion 14315 is provided on the outer ring surface of the limiting ring 14313. A slot 14111 is provided on the inner side surface of the side wall 1411 of the housing 141. The slot 14111 corresponds to the limiting protrusion 14315, and the limiting protrusion 14315 engages with the slot 14111 to fix the clamping portion 14311 in the second receiving space 1416 of the housing 141. In other embodiments, the positions of the retaining groove 14111 and the limiting protrusion 14315 can be interchanged. That is, the retaining groove 14111 can be provided on the outer surface of the limiting ring 14313, and the limiting protrusion 14315 can be provided on the inner surface of the side wall 1411 of the housing 141. Furthermore, the clamping portion 14311 and the housing 141 can be retained and secured using other methods, such as a threaded connection.

[0041] The fixing member 1433 includes a column portion 14331 and a protrusion 14333. The protrusion 14333 is distributed on the side of the column portion 14331 facing the top rod 1431, and is used to fix the fixing member 1433 to the top rod 1431. The protrusion 14333 is formed by extending the end surface of the column portion 14331 along the direction in which the refill 12 extends. Specifically, in this embodiment, the protrusion 14333 is located at the center position of the end surface of the column portion 14331. In other embodiments, the protrusion 14333 can be located at other positions on the end surface of the column portion 14331, and there can be multiple protrusions 14333, and the multiple protrusions 14333 can be symmetrically or asymmetrically distributed. In this embodiment, the limiting ring 14313 defines a groove 143131 at one end thereof facing the fixing member 1433. The groove 143131 has an opening on the end surface of the limiting ring 14313 facing the fixing member 1433. The groove 143131 corresponds to the protrusion 14333. The protrusion 14333 extends from the opening into the groove 143131 and is secured therein, thereby securing the fixing member 1433. The column portion 14331 defines a groove 143311. For ease of distinction, hereinafter, the groove 143311 defined on the column portion 14331 is referred to as the "first groove 143311," and the groove 143131 defined on the limiting ring 14313 is referred to as the "second groove 143131." The first groove 143311 is located on one end of the column portion 14331 facing the pressure sensing component 15 , and an opening is defined on the end surface of the column portion 14331 .

[0042] It should be noted that in this embodiment, the second groove 143131 fixes the protrusion 14333 by inserting during injection molding, and the fixing method is not limited to the injection molding method. At the same time, the material used for the fixing member 1433 includes but is not limited to conductive materials such as metal and conductive silicone.

[0043] Please refer to Figure 6 , Figure 6 yes Figure 2The three-dimensional structural diagram of the pressure sensing component 15 is shown. In this embodiment, the pressure sensing component 15 includes a conductive silicone member 151, an FPC flexible cable 153, a ceramic capacitor 155, a circuit board 157 and an elastic member 159. In other embodiments, the ceramic capacitor 155 can be replaced by other types of capacitors, such as chip capacitors. For ease of distinction, hereinafter, the circuit board 157 is referred to as the "first circuit board 157" and the circuit board 17 is referred to as the "second circuit board 17". The conductive silicone member 151 is partially fixedly accommodated in the first groove 143311, the FPC flexible cable 153 is clamped between the fixing member 1433 and the conductive silicone member 151, and the ceramic capacitor 155 is fixed to the first circuit board 157 and forms an electrical connection with the first circuit board 157. In this embodiment, forming an electrical connection means that a current path is formed between the two when power is supplied. The conductive silicone member 151 and the ceramic capacitor 155 are initially in contact. In this embodiment, the initial state is defined as a state where the writing end 121 of the stylus 10 is not subjected to writing pressure and the components inside the stylus 10 are not subjected to pressure from outside the stylus 10. The initial contact refers to a state where the conductive silicone member 151 and the ceramic capacitor 155 are in contact but do not apply pressure to each other in the initial state.

[0044] The conductive silicone member 151 includes a base 1511 and an elastic protrusion 1513 connected to each other. The base 1511 passes through the opening of the first groove 143311 and is fixedly accommodated in the first groove 143311. The elastic protrusion 1513 faces the ceramic capacitor 155 and is initially in contact with the ceramic capacitor 155.

[0045] The FPC flexible cable 153 includes a hollow ring-shaped end 1531, which is sleeved on the base 1511. Furthermore, the hollow ring-shaped end 1531 is clamped between the elastic protrusion 1513 and the fixing member 1433, and is abutted against the elastic protrusion 1513 and the fixing member 1433, thereby forming an electrical connection with the elastic protrusion 1513.

[0046] The ceramic capacitor 155 includes a first electrode 1551 and a second electrode 1553 disposed opposite each other. The first electrode 1551 is fixed to the first circuit board 157, and the second electrode 1553 faces the elastic protrusion 1513. In this embodiment, the first electrode can be fixed to the first circuit board 157 by welding or gluing with conductive adhesive, and is electrically connected to the first circuit board 157.

[0047] Please refer to Figure 7 , Figure 7 yes Figure 2 The figure shows a schematic diagram of the three-dimensional structure of the first circuit board 157. In this embodiment, the first circuit board 157 is substantially perpendicular to the extension direction of the refill 12. In this embodiment, a soldering pad 1571 is provided on the first circuit board 157. The soldering pad 1571 is located on the side of the first circuit board 157 facing the ceramic capacitor 155. The first electrode 1551 is welded to the soldering pad 1571 and electrically connected to the circuit on the first circuit board 157 via the soldering pad 1571. The first circuit board 157 also includes two ears 1573 extending from one end in opposite directions. In this embodiment, for ease of description, two directions perpendicular to the extension direction of the refill are defined as the upward direction and the downward direction, with the upward direction being opposite to the downward direction. Two other directions perpendicular to the extension direction of the refill, the upward direction, and the downward direction are defined as the left direction and the right direction, respectively. The spatial positional relationship of the components is defined by these upward, downward, left, and right directions, as well as the extension direction of the refill 12. In this embodiment, the two ears 1573 are formed by the left and right extensions of the upper end of the first circuit board 157.

[0048] It should be noted that, in this embodiment, the first electrode 1551 is welded and fixed to the pad 1571. In other embodiments, the first electrode 1551 can also be fixed to the first circuit board 157 by means of conductive adhesive and electrically connected to the circuit on the first circuit board 157.

[0049] One end of the elastic member 159 is disposed in contact with the first circuit board 157 , and the other end is disposed in contact with the fixing member 1433 . In this embodiment, the elastic member 159 does not conduct any circuit, that is, the elastic member 159 does not constitute a part of any circuit inside the stylus 10 .

[0050] Please refer to Figure 8 , Figure 8 yes Figure 2 The bracket 16 is a partially enlarged view of the bracket 16. The bracket 16 comprises a first fixing portion 161, a second fixing portion 163 and a third fixing portion 165 which are sequentially connected along the extending direction of the refill 12.

[0051] The first fixing portion 161 is substantially cylindrical and includes an annular wall 1611. The annular wall 1611 surrounds a through hole 1617 extending along the extension direction of the refill 12. The inner side of the annular wall 1611 is provided with an internal thread 1613 corresponding to the external thread 1413 of the housing 141. The internal thread 1613 screws together with the external thread 1413 to fix the housing 141 and the bracket 16 to each other. In other embodiments, the housing 141 may be provided with an internal thread, and the annular wall 1611 may be provided with a corresponding internal thread to fix the housing 141 and the bracket 16 to each other. Alternatively, the housing 141 and the bracket 16 may be fixed to each other by other means, such as a snap fastener. In this way, the housing 141 and the bracket 16 are connected in a detachable manner. By setting the seat bin 141 and the bracket 16 to be detachably connected, the components accommodated or partially accommodated inside the seat bin 141 can be directly placed through the openings at both ends of the seat bin 141, avoiding the need to open holes on the side walls of the seat bin 141, which increases the process and cost and reduces the strength of the seat bin 141; the components accommodated or partially accommodated in the bracket 16 can be directly placed through the opening at one end of the bracket, avoiding the need to open holes on the bracket 16, which increases the process and cost and reduces the strength of the bracket 16.

[0052] The fixing member 1433 is received in the through hole 1617 and abuts against the pressure sensing component 15 .

[0053] The second fixing portion 163 includes an arcuate wall 1631, a bottom wall 1633 substantially perpendicular to the arcuate wall 1631, and a clamping portion 1635. One end of the arcuate wall 1631 is connected to the annular wall 1611, and the other end is connected to the bottom wall 1633. In this embodiment, the arcuate wall 1631 is formed by a portion of the end of the annular wall 1611 away from the seat bin 141 extending toward the third fixing portion. The bottom wall 1633 is semicircular or fan-shaped, and the radius of the bottom wall 1633 is the same as the arc of the arcuate wall 1631. Adapting to the radius of the circle, the curved wall 1631 and the bottom wall 1633 enclose a space 1636, which communicates with the through-hole 1617. Because the curved wall 1631 is arc-shaped rather than a completely enclosed cylindrical shape, the space 1636 enclosed by the curved wall 1631 and the bottom wall 1633, in addition to the opening communicating with the through-hole 1617, also has an opening 1637 perpendicular to the opening. This opening 1637 allows the other end of the FPC cable 153 to pass through and connect to the second circuit board 17. The retaining portion 1635 is connected to the curved wall 1631 and is disposed at the opening 1637. Specifically, in this embodiment, the retaining portion 1635 is formed by extending upward from the end of the curved wall 1631 that is closest to the first fixing portion 161. The retaining portion 1635 is located above the curved wall 1631 and is shaped like a hook with its opening facing the third fixing portion 165. In this embodiment, there are two retaining portions 1635, one on each side of the opening 1637. The pressure sensing assembly 15 is housed within the space 1636, and the first circuit board 157 is disposed in contact with the bottom wall 1633.

[0054] The third fixing portion 165 is used to secure the second circuit board 17 and includes a curved wall 1651 and a blocking block 1653. In one embodiment, the curved wall 1651 is a semi-annular wall. The curved wall 1651 is formed by extending the curved wall 1631 along the direction of the pen refill 12. The blocking block 1653 is located above the bottom wall 1633 and is perpendicular to the semi-bottom wall 1633. In other embodiments, the curved walls 1651 and 1631 can be replaced by walls of other shapes, such as rectangular walls.

[0055] Please refer to Figure 9 , Figure 9 yes Figure 2The following is a three-dimensional schematic diagram and a partially enlarged view of the second circuit board 17. The second circuit board 17 is plate-shaped and is mounted above the curved wall 1651, abutting against the curved wall 1651. One end of the second circuit board 17 is clamped by the two clamping portions 1635. Specifically, in this embodiment, the clamped end of the second circuit board 17 is provided with a first straight groove 171 and a second straight groove 173. The first straight groove 171 passes through the end surface of the clamped end of the second circuit board 17, and the second straight groove 173 is connected to the first straight groove 171, and the two cooperate to form a T-shaped slot. The first straight groove 171 is provided corresponding to the first circuit board 157, and the second straight groove 173 is provided corresponding to the clamping block 1653. The first circuit board 157 is embedded in the first straight groove 171, and the second circuit board 17 is sandwiched between the curved wall 1651 and the two ears 1573 of the first circuit board 157. At the same time, the two ear portions 1573 of the first circuit board 157 are electrically connected to the second circuit board 17 by welding or other means, thereby forming a current path when the stylus 10 is powered.

[0056] When writing with the stylus 10, pressure is applied to the writing tip 121. As the pressure gradually increases, the fixed end 123 pushes the push rod 1431 toward the ceramic capacitor 155. This push on the fixed member 1433 drives the conductive silicone member 151 toward the ceramic capacitor 155, compressing the elastic member 159. The elastic protrusion 1513 of the conductive silicone member 151 squeezes the second electrode 1553 of the ceramic capacitor 155, causing it to deform and increase its contact area with the second electrode 1553. This increases the capacitance between the first electrode 1551 and the second electrode 1553. When the writing force decreases or is removed, the pressure on the writing tip 121 decreases, and the elastic force of the elastic member 159 becomes greater than the pressure, pushing the elastic member 159 toward the writing tip 121. The contact area between the elastic protrusion 1513 and the second electrode 1553 decreases until the initial contact state is restored.

[0057] Please combine again Figure 10 and Figure 11, shows the fixed and electrically connected relationship between the ceramic capacitor 155 and the first circuit board 157 in one embodiment of the present invention. The first electrode 1551 of the ceramic capacitor 155 is plated with a metal coating 1554 on the surface facing the first circuit board 157. The material of the metal coating may be, for example, gold or silver. The area of ​​the metal coating 1554 may be equal to the area of ​​the corresponding surface of the first electrode 1551 facing the first circuit board 157, that is, the metal coating 1554 may completely cover the corresponding surface of the first electrode 1551. In this embodiment, the area of ​​the metal coating 1554 is smaller than the area of ​​the corresponding surface of the first electrode 1551. Specifically, the metal coating 1554 is located at the center of the corresponding surface of the first electrode 1551. The first circuit board 157 is provided with a soldering pad 1571 corresponding to the metal coating 1554, and the metal coating 1554 is welded to the soldering pad 1571 by low-temperature soldering. The first circuit board 157 is further provided with one or more vias 1575, and the vias 1575 are through holes. The vias 1575 connect the conductive paths on the front and back sides of the first circuit board 157. In this embodiment, there are three vias 1575, which are distributed on opposite sides of the pad 1571. The pad 1571 and the vias 1575 are connected by a conductive circuit 1576 to form a conductive path for current to flow. A conductive circuit 1577 is provided on the side of the first circuit board 157 opposite to the ceramic capacitor 155, and the conductive circuit 1577 is then connected to the conductive circuit (not shown) on the second circuit board 17. Specifically, in this embodiment, the two ears 1573 are fixed to the second circuit board 17 by welding to fix the first circuit board 157 to the second circuit board 17, and the conductive circuit 1577 is electrically connected to the conductive circuit on the second circuit board 17. In this embodiment, the pad 1571, the conductive line 1576, the inner wall of the via 1575 and the conductive line 1577 are interconnected as a whole, and are made by etching or other existing circuit board processing technology using the same metal layer on the first circuit board 157, such as copper foil. On the side facing the ceramic capacitor 155, the metal layer distribution area is the pad area and the area where the three conductive lines 1576 connected to the three vias 1575 are located; the first circuit board 157 is divided into a central area and a peripheral area surrounding the central area on the side facing away from the ceramic capacitor 155. The metal layer distribution area is the peripheral area, including the positions of the two ears 1573, and is roughly U-shaped. In other embodiments, it can also be O-shaped or C-shaped. In other embodiments, the number of vias 1575 can be more or less than three, and the number of conductive lines 1577 connected to the vias 1575 can also be increased or decreased accordingly.Providing more than one via 1575 enhances the adhesion and stability of the metal layers on both sides of the first circuit board 157, while also enhancing the connection stability between the ceramic capacitor 155 and the first circuit board 157. Furthermore, by providing more than one via 1575, more than one conductive path is formed between the front and back sides of the first circuit board 157. If any one conductive path fails, there are still remaining conductive paths to electrically connect the first electrode 1551 of the ceramic capacitor 155 and the second circuit board 17, thereby reducing the risk of overall malfunction of the stylus 10 and improving the performance of the stylus 10.

[0058] Furthermore, to enhance stability, a colloid (not shown) is used to reinforce the connection between the first electrode 1551 and the first circuit board 157. Specifically, in one embodiment, a periphery of the first electrode 1551 is connected and secured to the first circuit board 157 via glue dispense, thereby enhancing the connection stability between the first electrode 1551 and the first circuit board 157. It should be noted that the colloid can be distributed over the entire periphery of the first electrode 1551 or only in a portion of the periphery.

[0059] It should be noted that although the ceramic capacitor 155 is used as an example to illustrate the mechanical fixed connection and electrical connection between the capacitor plate and the circuit board in the embodiment of the present application, the electrodes of other capacitors, such as chip capacitors, can also be fixed and electrically connected to the circuit board in the manner described above.

[0060] Compared to the prior art, the stylus 10 provided in the present embodiment utilizes an FPC flexible cable 153 to connect the second electrode 1553 to the second circuit board 17, resulting in a simple connection and easy assembly. Compared to solutions using elastic members for electrical conduction, this increases the conductive contact area, resulting in more stable and reliable performance. Furthermore, the stylus 10 provided in the present embodiment utilizes two circuit boards to achieve capacitor fixation, signal transmission, and processing. This not only reduces the size of the circuit boards, making the stylus smaller, but also reduces the number of required fixing components, making assembly easier. Furthermore, the unique connection between the first capacitor electrode 1551 and the first circuit board 157—through welding, gluing, and / or adding a conductive path—enhances the mechanical and electrical stability of the connection between the ceramic capacitor and the circuit board.

[0061] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A stylus pen having a refill, characterized in that: include: A capacitor comprising a first electrode and a second electrode disposed opposite to each other; a first circuit board, wherein the first electrode is fixed to the first circuit board and electrically connected to the first circuit board; Among them, a metal coating is provided on the first electrode, and a soldering pad is correspondingly provided on the first circuit board. The metal coating and the soldering pad are connected and fixed and electrically connected by welding to fix the capacitor to the first circuit board and electrically connect the first circuit board.

2. The stylus pen according to claim 1, wherein: The first electrode and the first circuit board are further connected and fixed via colloid.

3. The stylus pen according to claim 2, wherein: The periphery of the first electrode is fixedly connected to the first circuit board through the colloid.

4. The stylus pen according to claim 1, wherein: The device further includes a second circuit board, which is arranged on a side of the first circuit board away from the capacitor and has a conductive path with the first circuit board.

5. The stylus pen according to claim 4, wherein: The first circuit board has a via hole, which is a through hole. The via hole is located outside the pad. The pad and the via hole are electrically connected to each other, and the via hole and the second circuit board are electrically connected via a conductive line.

6. The stylus pen according to claim 5, wherein: The number of the via holes is two or more, and the via holes are distributed on both sides of the pad.

7. The stylus pen according to claim 6, wherein: The pads, the conductive circuits distributed on two opposite surfaces of the first circuit board, and the inner wall of the via hole are interconnected to form a whole.

8. The stylus pen according to claim 7, wherein: The pads, the conductive circuits distributed on two opposite surfaces of the first circuit board, and the inner walls of the via holes are formed by the same metal layer.

9. The stylus pen according to claim 7, wherein: A surface of the first circuit board opposite to the capacitor includes a central area and a peripheral area surrounding the central area, and the conductive circuit located on the surface is located in the peripheral area.

10. The stylus pen according to claim 9, wherein: The first circuit board extends outwardly with two ears, which are located in the peripheral area. The two ears are fixed to the second circuit board by welding and form an electrical connection, so as to fix the first circuit board to the second circuit board and form an electrical connection between the second circuit board.

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