KR20110020667A - Soft touch pen for capacitive touch screen panel - Google Patents

Abstract

PURPOSE: A soft touch pen for a capacitive touch screen panel is provided to induce the variation in electrostatic capacitance which can be recognized on a contact area of the touch screen panel by changing the contact area of an elastic body or brush on the touch screen panel. CONSTITUTION: A hollow elastic body(120) is prepared on one end of a pen body(110), and has conductivity and elastic restoration. The elastic body changes the area which contacts the touch screen panel. The elastic body is made of a silicone, urethane, rubber or synthetic resin. The elastic body has conductivity by forming a conductive coating film on an inner or outer plane thereof or mixing a carbon with a metal power in the process of forming the elastic body.

Description

Soft touch pen for capacitive touch screen panel

The present invention relates to a touch pen, and more particularly, to a touch pen that can be applied to a capacitive touch screen panel.

 Touch pens are widely used in touch screen panels employing a pressure-sensitive method using a pen pressure in which upper and lower electrodes selectively contact with a predetermined pressure.

For example, on a display panel provided by a personal portable device including a tablet of a digitizer, a mobile communication device such as a mobile phone, a personal digital assistant (PDA), a notebook computer, or the like. It is widely used for the purpose of accurately touching a desired part.

Meanwhile, the conventional touch pen may be used in a pressure-sensitive touch screen panel in which the upper and lower electrodes selectively contact with a predetermined pressure, but the capacitive method detects the contact position of the body by measuring the change in capacitance. Not suitable for use in touch screen panels.

Because, unlike the decompression method that can detect a specific position pressurized, in the electrostatic method that detects the change of capacitance at the touched part and detects the position, the change of capacitance does not occur with the conventional non-conductive touch pen. In the conventional touch pen, since the end portion of the touch pen is very narrow, it is difficult to substantially change the capacitance even if a conductive material is used.

The present invention provides a touch pen that can be applied to a capacitive touch screen panel.

The present invention provides a touch pen for a capacitive touch screen that can change the area so that the area in contact with the touch screen panel can provide a detectable change in capacitance.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the touch pen for applying to the touch screen panel to determine the contact position by measuring the change in capacitance, the pen body, and the pen body It is provided at one end of the, and includes a hollow elastic body having a predetermined elastic restoring force conductive, the elastic body is in contact with the touch screen panel is the area that is in contact with the touch screen panel is variable.

Accordingly, the touch pen can be used for accurately touching a desired portion on the display panel of the terminal to which the capacitive touch screen panel is applied. In particular, when the elastic body of the touch pen is vacant, the pen is pressed to the side by applying pressure. As it crushs, the area of contact with the touch screen panel is increased by touching the touch screen panel, which can cause a change in capacitance that the touch screen panel can detect.

In addition, the touch pen of another preferred embodiment of the present invention is provided on the pen body and one end of the pen body, has a conductive and predetermined elastic restoring force, the plate-like elastic body is gradually closer to both sides as the distance from the pen body It includes, and the elastic body may be in contact with the touch screen panel and the area in contact with the touch screen panel is variable.

In addition, the touch pen according to another preferred embodiment of the present invention, which is provided on the pen body and one end of the pen body, and includes a conductive brush portion, the brush portion is in contact with the touch screen panel variable area of contact with the touch screen panel You can also

The touch pen of the present invention may be applied to a capacitive touch screen panel by an electrically conductive elastic body or a brush part.

The elastic body or the brush portion of the touch pen of the present invention may change the area in contact with the touch screen panel by touching the touch screen panel, thereby inducing a change in capacitance in which the area in contact with the touch screen panel is detectable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. For reference, in the present description, the same numbers refer to substantially the same elements, and may be described by quoting contents described in other drawings under such a rule, and the contents repeated or deemed apparent to those skilled in the art may be omitted.

Example 1

A capacitive touch screen panel generally senses the contact of a finger that is in contact. A finger is a type of conductor through which electricity can flow, and when a finger comes close to an electrode, charge can be collected between the electrode and the finger. As the charge is collected, it becomes possible to measure the capacitance or capacitance between the finger and the electrode, which can be used to indirectly detect the touch of the finger.

On the other hand, the finger has a limit in accurately selecting the area and the contact point in contact with the touch screen panel, and may be further affected by the area of the touch screen panel. In order to solve this inconvenience, a touch pen may be used.

1 is a perspective view of an elastic body for explaining a touch pen according to a first embodiment of the present invention, Figures 2 and 3 are cross-sectional views of the elastic body of the touch pen according to the first embodiment.

1 to 3, the touch pen 100 according to the present embodiment includes a pen body 110 and an elastic body 220.

Since the elastic body 120 in contact with the touch screen panel in the touch pen 100 is conductive, the elastic body 120 may be applied to a touch screen panel which measures a change in capacitance to determine a contact position.

Pen body 110 is provided in the form of a rod that is easy to use by the user, can be manufactured using a conductive material such as metal as a whole, in the present embodiment is manufactured using a synthetic resin, the surface of the conductive material Coating. In this case, the surfaces of the pen body 110 and the elastic body 120 are electrically connected to the inside of the pen body 110 so that the surfaces of the elastic body 120 and the pen body 110 to be described later are electrically connected to each other. The conductive line 112 may be disposed. Thus, an electrical connection is made between the elastic body 120 and the hand, which is a kind of conductor directly contacting the pen body 110, and when the elastic body 120 approaches the electrode of the touch screen panel, the electrode and the elastic body 120 are close to each other. Charges can collect. As the charge is collected, it becomes possible to measure the capacitance or capacitance between the electrode and the elastic body 120. By using this phenomenon, the touch of the elastic body 120 can be indirectly sensed.

On the other hand, the elastic body 120 is made of at least one of silicon, urethane, rubber, synthetic resin hollow hollow form, in order to impart conductivity to the elastic body 120, the process of forming the elastic body 120 After mixing the carbon and the metal powder, or after forming the elastic body 120 and the conductive coating treatment on any one of the inner surface and the outer surface of the elastic body 120, it is connected to the conductive wires to be electrically connected to each other.

As shown in FIG. 2, in general, the cross section of the elastic body 120 is maintained in a generally circular state. On the other hand, as shown in Figure 3, when the elastic body 120 touches the touch screen panel, since the elastic body 120 is vacant in the center, the area in contact with the touch screen panel increases while being pressed and crushed by pressure. In addition, a change in capacitance that can be detected by the control unit of the touch screen panel may be performed. For reference, as shown, the elastic body 120 may be manufactured to have a circular cross section, but in some cases, may be manufactured in an elliptical shape.

Example 2

Components of the touch pen according to the present exemplary embodiment are substantially the same as the touch pen described with reference to FIGS. 1 to 3, and thus, the present exemplary embodiment will be described based on a somewhat different elastic body than the previous exemplary embodiment. Description of the components may be referred to the description and drawings of the touch pen of the previous embodiment, and repeated content will be omitted.

4 is a cross-sectional view of the elastic body of the touch pen according to the second embodiment of the present invention.

Referring to FIG. 4, the touch pen according to the present embodiment includes a pen body and an elastic body 220.

The elastic body 220 according to the present embodiment is coupled to the pen body, and a portion facing the pen body coupled portion is formed to protrude toward the center thereof.

That is, the elastic body 220 is formed such that the diameter of the cross section cut in the longitudinal direction decreases as the part facing the portion coupled to the pen body moves away from the pen body, so that the elastic body 220 faces the touch screen panel. When pressed in the direction, the area in close contact with each other may increase. Of course, even if the width of the cut surface along the longitudinal direction of the elastic body as a whole, when pressed, the area in close contact with the touch screen panel may increase, which is not excluded from the present invention.

In addition, the elastic body 220 is made of hollow, hollow inside using at least one of silicon, urethane, rubber, synthetic resin, in order to impart conductivity, carbon and metal powder in the process of forming the elastic body 220 After mixing or forming the elastic body 220, either of the inner surface and the outer surface of the elastic body 220 may be subjected to a conductive coating. The elastic body 220 is coupled to one end of the pen body, and may be electrically connected to the surface of the pen body by a conductive wire.

On the other hand, the central portion (A) of the opposite side of the elastic body 220 coupled to the pen body is formed so that the length of the inner diameter gradually decreases away from the pen body, the contact area increases as it is pressed toward the surface of the touch screen panel Manufactured to be. Thus, since the user can easily adjust the adhesion area of the elastic body 220 to the touch screen panel, it is possible to accurately touch the desired portion on the display panel, and in some cases the contact area between the elastic body 220 and the touch screen panel is In the case of generating a weak capacitance change that is difficult to locate the contact point, by pressing the elastic body 220 toward the touch screen panel, the area that is in contact with each other can be increased, and sufficient capacitance change can be generated. have.

Example 3

Components of the touch pen according to the present embodiment are substantially the same as the touch pen described in the first embodiment, and therefore, the present embodiment will be described with reference to the wrinkles formed on the elastic body, unlike the previous embodiment. Description of the components may be referred to the description and drawings of the touch pen of the previous embodiment, and repeated content will be omitted.

5 and 6 are cross-sectional views of elastic bodies for describing a touch pen according to a third embodiment of the present invention.

The touch pen according to the present embodiment includes a pen body and an elastic body 320.

As shown in FIG. 5, the elastic body 320 according to the present embodiment is coupled to the pen body, and a portion facing the pen body coupled portion has a diameter of the cross section cut in the longitudinal direction as the pen body is further away from the pen body. It is formed to decrease.

In addition, the elastic body 320 is made of at least one of silicon, urethane, rubber, synthetic resin, the hollow inside is hollow, in order to impart conductivity, carbon and metal powder in the process of forming the elastic body 320 After mixing or forming the elastic body 320, one of the inner surface and the outer surface of the elastic body 320 may be subjected to a conductive coating. The elastic body 320 is coupled to one end of the pen body, and is electrically connected to the surface of the pen body by a conductive line.

On the other hand, the central portion (B) of the opposite side of the elastic body 320 is coupled to the pen body is projected relative to the periphery, the contact area increases as it touches the surface of the touch screen panel. Accordingly, the user can easily adjust the adhesion area of the elastic body 320 to the touch screen panel, and in some cases, the area of contact between the elastic body 320 and the touch screen panel is weak enough to be difficult to determine the position of the contact point. In the case of generating a change, by pressing the elastic body 320 toward the touch screen panel, it is possible to increase the area in contact with each other and to generate a sufficient change in capacitance.

In particular, a ring-shaped pleat portion 340 is formed around the protruding center portion B along the transverse direction of the elastic body 320 so as to surround the center portion B. The center portion is formed by the pleat portion 340. When the portion B is pressed against the touch screen panel, as shown in FIG. 6, the central portion B is inserted into the elastic body 320 along the pleats 340, and thus the elastic body 320 and The area of contact between the touch screen panels may be increased.

Example 4

Components of the touch pen according to the present embodiment are substantially the same as the touch pen described in the first embodiment, and therefore, the present embodiment will be described with reference to the wrinkles formed on the elastic body, unlike the previous embodiment. Description of the components may be referred to the description and drawings of the touch pen of the previous embodiment, and repeated content will be omitted.

7 is a perspective view of an elastic body for explaining a touch pen according to a fourth embodiment of the present invention.

Referring to FIG. 7, the touch pen 400 according to the present embodiment includes a pen body 410 and an elastic body 420.

The elastic body 420 according to the present embodiment is coupled to the pen body 410, and the portion of the elastic body 420 facing the portion coupled to the pen body 410 decreases in diameter in the longitudinal direction as the distance from the pen body increases. It is formed to be hollow, hollow inside, and has conductivity.

On the other hand, the opposite central portion (C) of the elastic body 320 is coupled to the pen body 410 is projected in a direction opposite to the pen body compared to its periphery, the contact area increases as it is pressed against the surface of the touch screen panel .

In particular, a ring-shaped corrugation portion 440 formed along the transverse direction of the elastic body 420 is formed around the center portion C so as to surround the central portion C, and is spaced apart from each other by a predetermined distance. When the center portion C is pressed against the touch screen panel by the pleats 440 and is pressed, as shown in FIG. 7, the center portion C is the elastic body 420 along the pleats 440. Step by step) can be inserted into. Thus, the user can easily adjust the adhesion area of the elastic body 320 to the touch screen panel.

Example 5

Components of the touch pen according to the present embodiment are substantially the same as the touch pen described in the first embodiment, and therefore, the present embodiment will be described with reference to the wrinkles formed on the elastic body, unlike the previous embodiment. Description of the components may be referred to the description and drawings of the touch pen of the previous embodiment, and repeated content will be omitted.

8 is a perspective view and a cross-sectional view of an elastic body for explaining a touch pen according to a fifth embodiment of the present invention.

Referring to FIG. 8, the elastic body 520 of the touch pen according to the present embodiment is coupled to the pen body, and a portion opposite to the portion coupled to the pen body is cut in the longitudinal direction as it moves away from the pen body. It is formed to reduce the diameter.

The elastic body 520 is made of a hollow hollow inside, the outer surface has a predetermined wrinkled portion 540 extending in the longitudinal direction from the portion coupled to the pen body to the central portion opposite to the portion coupled to the pen body predetermined A plurality is formed at intervals.

The opposite central portion D of the elastic body 520 coupled to the pen body protrudes relative to the periphery thereof, and the contact area increases as it touches the surface of the touch screen panel.

In particular, since the wrinkles 540 extend in the longitudinal direction from the portion coupled to the pen body to the central portion opposite to the portion coupled to the pen body on the outer surface of the elastic body 520, the protruding center portion (D) ) Is pressed against the touch screen panel, the center portion B is easily bent, thereby increasing the area pressed against the touch screen panel.

Example 6

FIG. 9 is a perspective view illustrating a touch pen according to a sixth embodiment of the present invention, and FIG. 10 is a cross-sectional view of the touch pen of FIG. 9 cut in the A-A direction.

9 and 10, the touch pen 600 includes a pen body 610, a brush part 620, and a cover part 630.

Since the brush unit 620 in contact with the touch screen panel in the touch pen 600 according to the present invention is conductive, the brush unit 620 may be applied to a touch screen panel which measures a change in capacitance and grasps a contact position.

Pen body 610 is provided in the form of a rod that is easy to use by the user, can be manufactured using a conductive material such as metal as a whole, in the present embodiment is manufactured using a synthetic resin, the surface of the conductive material Coating. In this case, the surface of the pen body 610 and the brush portion 620 are electrically inside the pen body 610 so that the surfaces of the brush unit 620 and the pen body 610 to be described later are electrically connected to each other. Conductive lines 612 may be arranged to connect. Thus, an electrical connection is made between the brush 620 and the hand, which is a kind of conductor directly contacting the pen body 610. When the brush 620 approaches the electrode of the touch screen panel, the electrode and the brush unit ( Charges may collect between 620. As the charge is collected, it becomes possible to measure the capacitance or the capacitance between the electrode and the brush unit 620. By using this phenomenon, the touch of the brush unit 620 may be indirectly sensed.

On the other hand, the brush unit 620 includes a hair formed using at least any one of silicon, urethane, rubber, fiber, synthetic resin, and in order to provide conductivity to the hair, carbon and metal powder in the process of forming the hair After mixing or forming a wool, the surface of the wool is subjected to conductive coating using methods such as electroless plating and sputtering using carbon and metal.

As described above, the formed hair is fixed to the circular metal plate 611 that is coupled to the pen body 610, wherein the metal plate 611 and one end of the conductive wire 612 is connected, the hair and the pen body 610 The surface of) may be electrically connected.

Accordingly, the brush unit 620 presses a specific point of the capacitive touch screen panel to cause a change in capacitance, but the contact area between the brush unit 620 and the touch screen panel to determine the position of the contact point. In case of generating a weak change in the capacitance, the brush portion 620 is pushed toward the touch screen panel a little more to increase the mutually contacting area, thereby generating a sufficient change in capacitance and determining the position of the contact. Can be.

In addition, a cover portion 630 is provided to protect the brush portion 620 in a usual manner, the cover portion 630 is coupled to the pen body 610 to slide along the outer surface of the pen body 610. Specifically, the outer surface of the pen body 610 is formed with a groove-shaped slide groove 633, the inner surface of the brush portion 620 is formed with a projection protrusion of the projection shape is inserted into the slide groove 633 is formed By sliding the slide groove 633, the brush unit 620 may be selectively covered.

Example 7

11 is a partial cross-sectional view for describing a touch pen according to a seventh embodiment of the present invention.

Referring to FIG. 11, the touch pen 700 according to the present embodiment includes a pen body 710 and an elastic body 720.

The pen body 710 is provided in the form of a rod that is easy to be used by the user, and may be manufactured using a conductive material such as metal as a whole. Coating. In this case, the surface of the pen body 710 is electrically connected to the surface of the pen body 710 and the elastic body 720 so that the surfaces of the elastic body 720 and the pen body 710 to be described later are electrically connected to each other. A conductive line can be arranged.

On the other hand, the elastic body 720 is made of at least any one of silicon, urethane, rubber, synthetic resin hollow hollow form, in order to impart conductivity to the elastic body 720, the process of forming the elastic body 720 After mixing the carbon and the metal powder, or after forming the elastic body 720, any one of the inner surface and the outer surface of the elastic body 720 is subjected to a conductive coating, it is connected to the conductive line to be electrically connected to each other.

As shown in FIG. 11, in general, the cross section of the elastic body 720 maintains a substantially triangular shape. On the other hand, when the elastic body 720 touches the touch screen panel, since the elastic body 720 is vacant in the center, the elastic body 720 is pressed and crushed to increase the area in contact with the touch screen panel, and thus, the touch screen panel is detectable. Can make the work of changing capacitance.

On the other hand, in the present embodiment, the elastic piece 740 is disposed so as to be spaced apart from the inner surface of the elastic body 720 in the interior of the elastic body 780, a dome shape between the elastic piece 740 and the pen body 710. Dome switch 750 is disposed.

The elastic piece 740 has an outer edge coupled to the pen body 710, and an inner side thereof is spaced apart from the pen body 710 to form a space. At this time, the dome switch 750 is disposed in the internal space.

Therefore, when the elastic body 720 is pressed toward the touch screen panel, the area in contact with the touch screen panel increases, but when the inner surface of the elastic body 720 contacts the elastic piece 740, the dome switch 750 is covered. The elastic piece 740 is in close contact with the dome switch 750, and the shape of the dome switch 750 is deformed, and the form is restored when the pressure is released. In this case, when the shape of the dome switch 750 is changed, the user may feel a click through the pen body 710.

In addition, since the elastic body 720 is elastically supported by the switch unit 750, the user may press the elastic body 720 toward the touch screen panel with a suitable force.

On the other hand, in the present embodiment, the elastic piece 740 is provided in the form of a rod, the form may be provided in a form corresponding to the inner surface of the elastic body.

Example 8

Components of the touch pen according to the present embodiment are substantially the same as the touch pen described with reference to FIG. 3, and thus, the present embodiment will be described based on an elastic body that is somewhat different from the previous embodiment. For a description thereof, reference may be made to the description and drawings of the touch pen of the foregoing embodiment, and repeated descriptions thereof will be omitted.

12 is a perspective view of an elastic body for explaining a touch pen according to an eighth embodiment of the present invention.

Referring to FIG. 12, the touch pen according to the present embodiment includes a pen body and an elastic body 820.

The pen body 810 may be manufactured using a conductive material as a whole, but may be manufactured using synthetic resin, and the surface of the pen body 810 may be coated with a conductive material. In addition, the pen body may be electrically connected to the elastic body 820 and have an elastic restoring force, and the pen body may be provided in a plate shape in which distances on both sides thereof become gradually closer to each other.

On the other hand, the elastic body 820 is made of at least any one of silicon, urethane, rubber, synthetic resin, the inside is tightly integrated, and in order to give conductivity to the elastic body 820, the process of forming the elastic body 820 After mixing the carbon and the metal powder, or to form the elastic body 820 and the conductive coating on the outer surface of the elastic body 820.

As shown in FIG. 12, in general, the cross section of the elastic body 820 remains substantially triangular. On the other hand, when the elastic body 820 touches the touch screen panel, the elastic body 820 is pressed by the pressure and crushed to increase the area in contact with the touch screen panel, thereby changing the capacitance change that the touch screen panel can detect Can kill the job.

For reference, the elastic body 820 may be manufactured to have a triangle as shown in the figure, but the cross section cut in the longitudinal direction of the elastic body may be formed in the pen body so that the area of contact with the touch screen panel increases during pressing. It may also be formed in other forms in which the width thereof becomes narrower toward the portion opposite to the portion to be joined.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a perspective view of an elastic body for explaining a touch pen according to a first embodiment of the present invention.

2 and 3 are cross-sectional views of elastic bodies of the touch pen according to the first embodiment.

4 is a cross-sectional view of the elastic body of the touch pen according to the second embodiment of the present invention.

5 and 6 are cross-sectional views of elastic bodies for describing a touch pen according to a third embodiment of the present invention.

7 is a perspective view of an elastic body for explaining a touch pen according to a fourth embodiment of the present invention.

8 is a perspective view and a cross-sectional view of an elastic body for explaining a touch pen according to a fifth embodiment of the present invention.

9 is a perspective view illustrating a touch pen according to a sixth embodiment of the present invention.

FIG. 10 is a cross-sectional view of the touch pen of FIG. 9 cut in the A-A direction.

11 is a partial cross-sectional view for describing a touch pen according to a seventh embodiment of the present invention.

12 is a partial cross-sectional view for describing a touch pen according to an eighth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: Touch pen 110: Pen body

220: elastic body 340: wrinkle part

611: metal plate 612: conductive wire

613: Slide groove 620: Brush part

630: cover 633: slide projection

Claims (15)

In the touch pen for applying to the touch screen panel to measure the change in capacitance to determine the contact position, Pen body; And And a hollow elastic body provided at one end of the pen body and having a predetermined elastic restoring force having conductivity. The elastic body is in contact with the touch screen panel, the touch pen, characterized in that the area in contact with the touch screen panel is variable. The method of claim 1, The elastic body is formed using at least any one of silicone, urethane, rubber, synthetic resin, Touch pen, characterized in that to form the elastic body is mixed with carbon and metal powder, or after forming the elastic body to give the conductive to the elastic body by using a conductive coating on any one of the inner surface and the outer surface of the elastic body. The method of claim 1, The touch pen further comprises a wrinkle portion formed in the horizontal or vertical direction on the outer surface of the elastic body. The method of claim 1, The pen body is conductive, And the elastic body and the pen body are electrically connected to each other. The method of claim 1, The cross section of the elastic body is a touch pen, characterized in that the circular or oval. The method of claim 1, The elastic body is a touch pen, characterized in that the diameter of the cross-section is reduced as the portion facing the portion coupled to the pen body away from the pen body. The method of claim 1, An elastic piece disposed to be spaced apart from an inner surface of the elastic body in the elastic body; And And a dome switch interposed between the elastic piece and the pen body. In the touch pen for applying to the touch screen panel to measure the change in capacitance to determine the contact position, Pen body; And And a plate-shaped elastic body provided at one end of the pen body and having conductivity and a predetermined elastic restoring force, and the distance between both sides gradually closer to the pen body. The elastic body is in contact with the touch screen panel, the touch pen, characterized in that the area in contact with the touch screen panel is variable. The method of claim 8, The elastic body is formed using at least any one of silicone, urethane, rubber, synthetic resin, Touch pen, characterized in that for mixing the carbon and metal powder in the process of forming the elastic body, or after forming the elastic body to give conductivity to the elastic body by using a conductive coating on the outer surface of the elastic body. The method of claim 8, The elastic body is a touch pen, characterized in that provided in the form of a triangle. 10. The method of claim 9, The pen body is conductive, And the elastic body and the pen body are electrically connected to each other. In the touch pen for applying to the touch screen panel to measure the change in capacitance to determine the contact position, Pen body; And A brush portion provided at one end of the pen body and having a conductivity; The brush unit is in contact with the touch screen panel, the touch pen, characterized in that the area in contact with the touch screen panel is variable. The method of claim 12, The brush unit includes a hair formed using at least any one of silicone, urethane, rubber, fiber, and synthetic resin, Touch pen, characterized in that for mixing the carbon and metal powder in the process of forming the hair or after forming the hair to give the hair a conductivity using a conductive coating on the surface of the hair. The method of claim 12, And a cover part which slides along the outer surface of the pen body to cover the brush part. The method of claim 12, The pen body has conductivity, and the brush unit and the pen body are electrically connected to each other.

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