CN207367174U - Conductive stylus tip and stylus - Google Patents

Abstract

The utility model discloses a conductive touch pen tip and a touch pen, wherein the conductive touch pen tip comprises a metal rod and a plastic covering; the metal rod has a rod head, a tail and a rod body, wherein a connecting core rod extends between the rod head and the rod body; the plastic covering and the metal rod are integrally injection molded, and the plastic covering comprises a conductive part and a non-conductive part which are connected to each other and cover the rod head and the rod body respectively; the connecting core rod is covered between the conductive part and the non-conductive part, and the tail of the metal rod protrudes outside the non-conductive part; thereby, the signal strength can be effectively increased to improve the touch accuracy.

Description

Conductive stylus tip and stylus

technical field

The utility model relates to a stylus, in particular to a replaceable conductive stylus head and stylus which improve the touch accuracy.

Background technique

With the development of science and technology, 3C products are introduced faster and faster, especially touch-operated interface products, such as tablet computers and smart phones, have become the trend and mainstream of future development. Touch operation interface products are mainly realized by the touch screen combined with the graphical operation interface of the operating system (operation system). Touch screens can be divided into resistive touch screens, capacitive touch screens, and electromagnetic touch screens according to their sensing principles. There are several types of touch screens.

The various touch screens mentioned above are used to detect the position of the stylus to generate corresponding pointers or cursors to interact with the corresponding touch operation interface products. However, when the stylus is tilted on the touch screen, there is often a gap between the position of the pointer or cursor displayed on the touch screen and the position to be clicked and controlled by the stylus, resulting in poor accuracy and insufficient sensitivity. Operational inconvenience. In addition, since the tip of the stylus will wear out after long-term use, and even be bent or broken due to pressure, it cannot be used, that is, the entire stylus must be replaced, which increases user costs.

Therefore, how to overcome the above-mentioned deficiency by improving the structural design has become one of the important issues to be solved in this project.

Utility model content

One of the purposes of the present invention is to provide a conductive stylus tip and a stylus that increase the signal strength to effectively improve the touch accuracy.

Another object of the present invention is to provide a replaceable conductive touch pen head and touch pen.

In order to achieve the above purpose, the utility model provides a conductive stylus tip, which is assembled on a pen shaft and operates a capacitive touch sensing device. The conductive stylus head includes a metal rod and a plastic covering part. The metal rod has a head, a tail and a body connecting the head and the tail, wherein a connecting mandrel extends between the head and the body. The plastic covering part includes a conductive part and a non-conductive part which are connected with each other and cover the rod head and the rod body respectively. The connecting mandrel is wrapped between the conductive part and the non-conductive part, and the tail of the metal rod protrudes out of the non-conductive part.

In order to achieve the above purpose, the utility model also provides a stylus, including a pen shaft and the above-mentioned conductive stylus head. The conductive stylus can be replaceably assembled on the pen holder, and the pen holder is a suitable conductive part or any suitable non-conductive part, depending on the requirements of the stylus.

The utility model also has the following effects. In a specific embodiment, the plastic covering part and the metal rod are integrally injection-molded, that is, the conductive part and the non-conductive part are integrally injected into the metal rod, and the positioning groove of the metal rod increases two Positioning effect of different materials. There is also a connecting mandrel between the rod head and the connecting rod body, and the positioning groove is formed on the connecting mandrel. In other words, the radial direction of the connecting mandrel is turned by turning the rod body, for example, to form a positioning groove on the connecting mandrel, so as to increase the positioning effect with the plastic covering part.

Since the cross-sectional area of the connecting mandrel is less than twice the cross-sectional area of the rod head, it is less likely for the connecting mandrel to generate capacitive sensing signals with the touch screen. That is to say, since the distance between the connecting mandrel and the touch screen is increased, and the distance between the conductive stylus and the touch screen is shortened, the contact point where the conductive stylus touches the touch screen is different from the position actually judged by the system. Therefore, the accuracy and sensitivity of the touch between the conductive stylus and the touch screen can be effectively improved.

In the utility model, when the conductive parts of the conductive stylus tip are worn/abrased by long-term use, or even accidentally broken or bent, the worn-out conductive stylus tip can be easily unscrewed from the insertion hole of the pen holder through the thread structure, and A new conductive stylus tip with an external thread portion is screwed to the internal thread portion of the insertion hole for fastening. In other embodiments, it can also be replaced by methods such as interference fit, snap-fitting and the like. Therefore, the conductive stylus tip of this embodiment is easy to replace and has good reliability, and there is no need to buy a whole new stylus, which can greatly reduce the purchase cost.

Description of drawings

FIG. 1 is a schematic diagram of a stylus of the present invention, that is, a schematic diagram of a conductive stylus head installed on a pen holder.

Fig. 2 is a perspective view of the metal rod of the conductive stylus tip of the present invention.

Fig. 3 is a cross-sectional view of the metal rod of the conductive stylus tip of the present invention.

Fig. 4 is a sectional view of the integral injection molding of the metal rod and the conductive part of the present invention.

Fig. 5 is a cross-sectional view of the metal rod and the non-conductive part of the utility model for integral injection molding.

Fig. 6 is a perspective view of the plastic covering part solidified and bonded to the metal rod of the present invention.

FIG. 7 is a cross-sectional view of the replaceable screw connection of the conductive stylus tip of the present invention to the pen holder.

FIG. 8A is an experimental diagram of a known capacitive touch sensing device controlled by a stylus.

FIG. 8B is an experimental diagram of the capacitive touch sensing device controlled by the stylus of the present invention.

Explanation of symbols in the accompanying drawings:

1 conductive stylus tip; 2 metal rod; 21 rod head; 22 rod body; 221 convex ring part; ;31 conductive part; 32 non-conductive part; 33 extended non-conductive part; 4 socket part; L" length.

Detailed ways

The detailed description and technical content of the present utility model are described below with drawings, but the attached drawings are only for reference and illustration, and are not intended to limit the present utility model.

Referring to FIG. 1 to FIG. 6 , the present invention provides a conductive stylus 1 , which is assembled on a pen shaft 5 to form a stylus 6 . The stylus 6 of this embodiment can actively transmit signals or actively receive signals generated by touching a capacitive touch sensing device (not shown) with a touch screen, such as tablet computers, mobile devices, graphics An active capacitive stylus 6 is formed by a tablet or other suitable touch sensing devices, so that the conductive stylus tip 1 is assembled in the pen barrel 5 with a power supply or a capacitive circuit. However, in other different embodiments, the stylus 6 can also be a passive stylus or other suitable stylus, which can be changed as needed.

In the embodiment shown in FIG. 1 , the pen holder 5 of the active capacitive stylus 6 is provided with, for example, an insertion hole 51 , a circuit unit 52 having electronic components such as capacitors, and a power supply unit 53 coupled to the circuit unit 52 . The power supply unit 53 is, for example, a dry battery, a storage battery or a lithium battery to provide power required by the stylus 6 . The contact position is determined according to the capacitance value change between the conductive stylus tip 1 and the capacitive touch sensing device, and its coordinates are detected by the induced current generated by the touch position. The conductive stylus head 1 can be assembled on the pen holder 5 replaceably, and the pen holder 5 is a suitable conductive part or any suitable non-conductive part, depending on the requirements of the stylus 6 . Specifically, the insertion hole 51 of the pen holder 5 is detachably assembled with the conductive stylus tip 1 , and the assembly method will be described later.

As shown in FIGS. 2 to 6 , the conductive stylus tip 1 includes a metal rod 2 and a plastic covering part 3 . The metal rod 2 has a head 21 , a tail 23 and a body 22 connecting the head 21 and the tail 23 , wherein a connecting mandrel 25 extends between the head 21 and the body 22 . The metal rod 2 of this embodiment is preferably in the shape of an upright rod, and its material includes but not limited to iron, steel, copper or alloys thereof and other materials with good electrical conductivity. One end of the metal rod 2 supports and holds the plastic cover 3 , and the other end is electrically coupled with the circuit unit 52 of the penholder 5 for conducting an input signal generated by the touch screen (not shown) through the circuit unit 52 Receive the input signal and transmit an output signal to the touch sensing device (system), and then interact with the system to determine its coordinate position.

The plastic covering part 3 and the metal rod 2 are integrally injection-molded to control the touch sensing device with elasticity and wear resistance (figure omitted). In particular, the plastic covering part 3 includes a conductive part 31 and a non-conductive part 32 connected to each other and respectively covering the rod head 21 and the rod body 22 . The connecting mandrel 25 is located between the conductive element 31 and the non-conductive element 32 , and the tail 23 of the metal rod 2 protrudes from the non-conductive element 32 .

A positioning groove 24 is formed on the connecting mandrel 25 , and the positioning groove 24 is located on the surface of the connecting mandrel 25 in an annular shape. In this embodiment, the conductive element 31 and the non-conductive element 32 are preferably double-molded with the metal rod 2 by insert molding. The positioning effect or bonding strength of two different materials is increased through the positioning groove 24 of the metal rod 2 . In the embodiment shown in FIGS. 2 to 6 , the rod body 22 can form a positioning groove 24 on the connecting mandrel 25 by turning the connecting mandrel 25 in a radial direction, for example, to increase the compatibility with the plastic coating. The positioning effect of item 3. The diameter of the connecting mandrel 25 is smaller than the diameter of the rod head 21 or the rod body 22, so that the plastic covering part 3 and the connecting mandrel 25 are more firmly connected.

It should be noted here that the shape of the rod head 21 is preferably a disc shape, while the shape of the connecting mandrel 25 is a cylinder, so that the cross-sectional area of the rod head 21 is greater than twice that of the connecting core The cross-sectional area of the rod 25 section. The conductive member 31 also partially exposes the connecting mandrel 25, that is, the non-conductive member 32 partially covers the connecting mandrel 25, so that both the rod head 21 and the connecting mandrel 25 located on the conductive member 31 can generate inductive capacitance with the touch screen. coupled to an input signal. However, the connecting mandrel 25 and the rod body 22 located on the non-conductive member 32 will not generate capacitive sensing signals with the touch screen because the material is non-conductive.

It should be noted here that although both the rod head 21 and the connecting mandrel 25 located on the conductive member 31 can generate capacitive induction with the touch screen, the cross-sectional area of the connecting mandrel 25 is smaller than twice the rod head The cross-sectional area of the section 21 makes it less likely for the connecting mandrel 25 to generate capacitive sensing signals with the touch screen. That is to say, since the distance between the connecting mandrel 25 and the touch screen is increased, and the distance between the rod head 21 and the touch screen is shortened, the contact point where the conductive stylus tip 1 touches the touch screen is different from the actual judgment of the system. The difference/error between positions is reduced, so the precision and sensitivity of touch between the conductive stylus tip 1 and the touch screen can be effectively improved.

The steps of integral injection molding of the plastic covering part 3 and the metal rod 2 will be further described below, as shown in FIGS. 4 to 6 . Generally speaking, a metal rod 2 made by turning or other suitable manufacturing methods is put into a mold (not shown). Firstly, a plastic material mixed with metal powder is injected into the mold to properly cover the rod head 21 and part of the connecting mandrel 25 . After the conductive element 31 is solidified, the step of injecting the non-conductive element 32 is performed. When injecting such as polyoxymethylene (Polyoxymethylene; POM) non-conductive member 32 in the mould, the non-conductive member 32 just connects the conductive member 31 and the covering part connects the mandrel 25 to the socket part 4, using the positioning groove 24 and The two cavities 222 on the protruding ring portion 221 are used to increase the positioning effect or bonding strength between the non-conductive element 32 and the conductive element 31 .

Polyoxymethylene (POM) is also used as the plastic material of the conductive element 31, so that the solidified conductive element 31 and the non-conductive element 32 have suitable surface resistance, strength, elasticity, wear resistance and excellent dimensional stability. However, in other different embodiments, the conductive element 31 and the non-conductive element 32 may also use polyurethane (PU; Polyurethane) or other suitable thermoplastics, wherein metal powder is added to the polyurethane to become the conductive element 31 .

In addition, the length L' of the conductive member 31 along the longitudinal direction of the metal rod 2 is preferably smaller than the length L" of the non-conductive member 32 along the longitudinal direction of the metal rod 2. , can reliably generate capacitive sensing signals with the club head 21 located in the conductive member 31 .

In the embodiment shown in FIG. 5 and FIG. 6 , it also includes an inserting portion 4 assembled on the pen holder 5 . The insertion portion 4 includes a protruding ring portion 221 disposed around the rod body 22 and an extended non-conductive member 33 covering the protruding ring portion 221 . The protruding ring portion 221 is also provided with two corresponding cavities 222 towards the direction of the rod head 21, which can be inserted into each cavity 222 when the extended non-conductive parts 33 are formed, so as to increase the number of extended non-conductive parts 33/non-conductive parts 32 The positioning effect with the metal rod 2. In this embodiment, the extended non-conductive element 33 injection-molded on the protruding ring portion 221 is preferably integrally injection-molded when the non-conductive element 32 is injection-molded, so as to save process time and cost.

In addition, the outer surface of the tail portion 23 also has an external thread portion 231 , which can be screwed to the pen holder 5 replaceably. Referring to FIG. 7 , the pen holder 5 is further provided with an insertion hole 51 corresponding to the insertion portion 4 and an internal thread portion 511 along the inner wall of the insertion hole 51 . When the conductive part 31 of the conductive stylus 1 is worn/abrased by long-term use, or even accidentally broken or bent, the worn-out conductive stylus 1 can be easily screwed from the socket hole 51 of the pen holder 5 through the thread structure. out, and use the new conductive stylus tip 1 with the external thread portion 231 to be screwed to the internal thread portion 511 of the insertion hole 51 for fastening. In other different embodiments, the conductive stylus tip 1 and the pen holder 5 can also be replaced by snap-fastening methods such as interference fit or flanges/depressions, but are not limited thereto. Therefore, the conductive stylus 1 of this embodiment is easy to replace and has good reliability, and there is no need to buy a new stylus 6, which can greatly reduce the purchase cost.

The following further compares the differences between the conductive stylus 1 and the stylus 6 of the present invention and the existing stylus-controlled capacitive touch sensing device (figure omitted), as shown in FIGS. 8A and 8B . FIG. 8A is an experimental diagram of a known capacitive touch sensing device controlled by a stylus. FIG. 8B is an experimental diagram of controlling the capacitive touch sensing device with the stylus of the present invention. In a specific embodiment, when the conductive stylus 1 tilts to touch the capacitive touch sensing device (not shown), the signal strength generated by the existing stylus (not shown) on the capacitive touch sensing device is 1014 (the upper part of FIG. 8A ), while the signal strength of the conductive stylus tip 1 of the present invention in the capacitive touch sensing device is 1746 (the upper part of FIG. 8B ), which is obviously higher than the existing design.

Furthermore, due to the structural design of the metal rod 2 of the present invention, the noise (that is, both sides of the signal strength) is also significantly reduced. There is no difference in the signal strength between the conductive stylus 1 and the stylus 6 of the present invention and the touch sensing device when they stand upright, but the noise of the present invention is significantly lower than that of the prior art, refer to the lower half of Figures 8A and 8B shown. Therefore, the conductive stylus tip 1 and the stylus 6 of the present invention have been proved by experiments to effectively increase the signal strength and achieve the effect of improving the touch accuracy.

To sum up, the embodiments disclosed herein should be regarded as illustrating the utility model rather than limiting the utility model. The scope of the present invention shall be defined by the claims of the appended claims, and shall cover their legal equivalents, and not be limited by the foregoing description.

Claims (11)

1. A conductive stylus tip, assembled in a pen holder, is characterized in that, said conductive stylus tip comprises: A metal rod having a head, a tail, and a body connecting the head and the tail, wherein a connecting mandrel extends between the head and the body; and A plastic covering part, including a conductive part covering the rod head and a non-conductive part covering the rod body, wherein the connecting mandrel is covered between the conductive part and the non-conductive part between, and the tail of the metal rod protrudes out of the non-conductive member. 2. The conductive stylus tip according to claim 1, wherein a positioning groove is formed on the connecting core rod. 3. The conductive stylus tip as claimed in claim 1, wherein the diameter of the connecting mandrel is smaller than the diameter of the rod head, the shape of the rod head is a disk, and the connecting core The shape of the rod is a cylinder. 4 . The conductive stylus tip according to claim 1 , wherein the cross-sectional area of the tip section is more than twice the cross-sectional area of the connecting mandrel section. 5 . 5 . The conductive stylus tip according to claim 1 , wherein the length of the conductive member along the longitudinal direction of the metal rod is smaller than the length of the non-conductive member along the longitudinal direction of the metal rod. 6 . The conductive stylus tip according to claim 1 , wherein the conductive element comprises metal powder mixed with a plastic material, and both the non-conductive element and the plastic material are polyoxymethylene. 7. A touch pen, characterized in that, comprising: a lump sum; and A conductive stylus tip as claimed in any one of claims 1 to 6, wherein the conductive stylus tip is replaceably assembled on the pen holder. 8. The stylus according to claim 7, wherein the conductive stylus head further comprises an inserting portion assembled on the pen holder, and the inserting portion comprises a ring set around the rod body The protruding ring part and an extended non-conductive part covering the protruding ring part. 9. The stylus according to claim 8, wherein two corresponding cavities are opened in the direction of the protruding ring facing the stick head, and the extended non-conductive parts are embedded in each of the The cavity covers the body of the stick. 10 . The stylus according to claim 8 , wherein the pen barrel is further provided with an insertion hole corresponding to the insertion portion and an internal thread portion along the inner wall of the insertion hole. 11 . 11. The stylus according to claim 10, wherein the outer surface of the tail of the conductive stylus also has an external thread, and the external thread of the conductive stylus is screwed on The internal thread portion of the pen holder.