Capacitance testing device of touch pen

Abstract

The utility model discloses a capacitance testing device for a touch pen, relates to the technical field of capacitance testing, and solves the technical problem that a conventional testing jig is difficult to test whether a pressure sensing channel of the touch pen is good or bad. The device is used for testing whether an induction area of the stylus is bad or not and comprises N pairs of conductive test modules. Each pair of conductive test modules comprises an upper conductive unit and a lower conductive unit; a lower pen groove is formed below each upper conductive unit; an upper pen groove is formed above each lower conductive unit; the lower pen grooves of the upper conductive units and the upper pen grooves of the lower conductive units are arranged in a one-to-one correspondence mode, and the touch pens are clamped in the lower pen grooves and the upper pen grooves. According to the utility model, the capacitance test of all pressure sensing channels on the stylus can be completed at one time.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitance testing, and in particular to a capacitance testing device for a touch pen. Background Art

[0002] A stylus is a portable input tool used to input commands to touchscreen devices such as computer screens, mobile devices, and drawing tablets. Users can select files or draw by tapping the touchscreen with the stylus. Currently, when drawing, most styluses allow users to double-click the touch-sensitive area (the front half of the pen body) to quickly switch between the eraser and brush. Touch channels and touch chips, among other related circuits, are typically laid out on a flexible printed circuit (FPC) module via flexible cables. The back of the FPC module is designed to be paved, allowing the FPC's soft properties to assemble and fit the pen body's inner wall and refill.

[0003] After assembly is completed, it is necessary to test whether all channels of the touch module in the stylus have touch capacitance changes to test the touch performance of the stylus. Conventional test fixtures such as Figure 1 and Figure 2 As shown, the structure is divided into an upper test mold 100 and a lower test mold 200. Pen grooves are designed in the upper test mold 100 and the lower test mold 200 to cover the sensing area 1 of the stylus body for press-fit testing. The purpose is to make all channels have touch capacitance changes, so as to determine whether a touch channel is defective due to the assembly of the entire pen.

[0004] With the development of stylus technology and the increase of user demand, touch pressure sensing technology has gradually been applied to stylus. Figure 2 and Figure 3 As shown, the outermost layer of the stylus is the pen shell 106. Inside the pen shell 106 are several touch sensing channels 105, an FPC module 104, several pressure sensing channels 103, elastic foam 102 and a steel pen core 101. In this way, the pressure sensing channel forms an inductive capacitor with the steel pen core 101 through the elastic foam. When the pen body shell is squeezed, the elastic foam will be compressed, and the distance between the pressure sensing channel and the steel pen core 101 will become shorter, thereby causing a change in capacitance.

[0005] Through this touch pressure-sensing technology, you can quickly pop up the tool tray on the touch device by squeezing gestures on the stylus, so that you can quickly switch brush tools, line thickness, color, etc. The addition of touch pressure-sensing technology can meet the needs of users for a lot of writing or painting, improving work efficiency and personal experience. However, after the stylus with touch pressure-sensing technology is assembled, it is necessary to test not only the touch channel but also the pressure sensing channel to test whether all the touch channels and all the pressure sensing channels of the FPC module are defective. But if it is used Figure 1 The test fixture shown here has two pressing molds that contact the entire front half of the pen body. This prevents significant surface deformation of the pen body, even with the greatest pressing force. As a result, the FPC module remains unchanged, making it difficult to test the quality of the pressure sensing channel.

[0006] In the process of implementing the present invention, the applicant discovered that the prior art has at least the following problems:

[0007] It is difficult for existing test fixtures to detect whether the pressure sensing channel of a stylus pen is good or bad. Utility Model Content

[0008] The present invention aims to provide a stylus capacitance tester to address the technical issue of existing test fixtures, which make it difficult to determine whether a stylus's pressure sensing channel is good or bad. The various technical advantages achieved by the preferred solution among the various technical solutions provided by this invention are detailed below.

[0009] To achieve the above objectives, the present invention provides the following technical solutions:

[0010] The present invention provides a capacitance testing device for a stylus pen, which is used to test whether the sensing area of ​​the stylus pen is defective. The device includes N pairs of conductive testing modules. Each pair of conductive testing modules includes an upper conductive unit and a lower conductive unit. A lower pen slot is provided below each upper conductive unit. An upper pen slot is provided above each lower conductive unit. The lower pen slot of each upper conductive unit is provided in a one-to-one correspondence with the upper pen slot of the lower conductive unit. The stylus pen is engaged in the lower pen slot and the upper pen slot.

[0011] Optionally, a set distance is set between every two pairs of the conductive test modules.

[0012] Optionally, the set distances between every two pairs of the conductive testing modules are equal or unequal.

[0013] Optionally, the width of each pair of the conductive testing modules is smaller than 1 / N of the length of the sensing area of ​​the stylus.

[0014] Optionally, a total length of the width of each pair of the conductive testing modules plus a set distance between all the conductive testing modules is smaller than a length of the sensing area of ​​the stylus.

[0015] Optionally, the set distance between every two pairs of the conductive test modules is adjustable.

[0016] Optionally, the capacitance testing device is further provided with N-1 first conductive blocks and N-1 second conductive blocks; the top of each upper conductive unit is fixedly connected by N-1 first conductive blocks; the bottom of each lower conductive unit is fixedly connected by N-1 second conductive blocks.

[0017] Optionally, each pair of the upper conductive unit and the lower conductive unit is pressed together by pneumatic control.

[0018] Optionally, the material of each pair of the upper conductive unit and the lower conductive unit is conductive silicone.

[0019] Implementing one of the above technical solutions of the utility model has the following advantages or beneficial effects:

[0020] The present invention designs a segmented capacitance testing device based on the number of pressure sensing channels set in the stylus sensing area. The stylus is placed in the pen slot, and each pair of conductive test modules acts on each set of pressure sensing channels of the stylus respectively. Each pair of conductive test modules is controlled to press together, which can segmentally squeeze each set of pressure sensing channels in the sensing area, causing the elastic foam between the pressure sensing channels in the sensing area and the steel pen core to deform, thereby changing the distance between the pressure sensing channels and the steel pen core, thereby triggering a change in the capacitance of each set of pressure sensing channels. The capacitance change is used to determine whether the pressure sensing channels of the stylus are defective, and all pressure sensing channels on the stylus can be tested at one time. This device can not only test whether the pressure sensing channels are defective, but also whether the touch sensing channels are defective. Only one device is used to complete the testing of both channels at the same time, greatly improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of 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. In the drawings:

[0022] Figure 1 This is a first structural diagram of the prior art stylus pen test fixture of the utility model;

[0023] Figure 2This is a second structural diagram of the prior art stylus pen test fixture of the present utility model;

[0024] Figure 3 This is an exploded view of the prior art stylus structure of the present utility model;

[0025] Figure 4 It is a structural diagram of the prior art touch pen structure of the utility model;

[0026] Figure 5 This is a first structural diagram of a capacitance testing device for a stylus pen according to an embodiment of the present utility model;

[0027] Figure 6 This is a second structural diagram of the capacitance testing device for a stylus according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the pressure sensing channel on the back of the stylus FPC module according to an embodiment of the present invention;

[0029] In the figure: 1. Sensing area; 2. Conductive test module; 21. Upper conductive unit; 211. Lower pen slot; 22. Lower conductive unit; 221. Upper pen slot; 31. First conductive block; 32. Second conductive block; 100. Upper test mold; 200. Lower test mold; 101. Steel sheet refill; 102. Elastic foam; 103. Array pressure sensing channel group; 104. FPC module; 105. Several touch sensing channels; 106. Pen case. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, in which various exemplary embodiments that may be used to implement the present invention are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods and devices that are consistent with some aspects of the present disclosure as detailed in the appended claims, and other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", etc. indicate the orientation or position relationship based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, be constructed and operate in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0032] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below, in which only the parts related to the embodiment of the present invention are shown.

[0033] Example 1:

[0034] like Figure 4 As shown, the present invention provides a capacitance testing device for a stylus pen, which is used to test whether the sensing area 1 of the stylus pen is defective, including N pairs of conductive testing modules 2; each pair of conductive testing modules 2 includes an upper conductive unit 21 and a lower conductive unit 22; a lower pen slot 211 is provided below each upper conductive unit 21; an upper pen slot 221 is provided above each lower conductive unit 22; the lower pen slot 211 of each upper conductive unit 21 and the upper pen slot 221 of the lower conductive unit 22 are provided in a one-to-one correspondence, and the stylus pen is engaged in the lower pen slot 211 and the upper pen slot 221. Specifically, the sensing area 1 of the stylus pen is located in the lower pen slot 211 and the upper pen slot 221. When the upper conductive unit 21 and the lower conductive unit 22 are controlled to be pressed together, the elastic foam 102 in the sensing area 1 will be deformed.

[0035] This embodiment designs a segmented capacitance testing device based on the number of pressure sensing channels set in the stylus sensing area 1. The stylus is placed in the pen slot, and each pair of conductive test modules 2 acts on each set of pressure sensing channels of the stylus respectively. Each pair of conductive test modules 2 is controlled to press together, which can segmentally squeeze each set of pressure sensing channels on the sensing area 1, causing the elastic foam between the pressure sensing channels on the sensing area 1 and the steel sheet pen core 101 to deform, thereby changing the distance between the pressure sensing channels and the steel sheet pen core 101, thereby triggering a change in the capacitance of each set of pressure sensing channels. The capacitance change is used to determine whether the pressure sensing channels of the stylus are defective, and all pressure sensing channels on the stylus can be tested at one time. This device can not only test whether the pressure sensing channels are defective, but also test whether the touch sensing channels are defective. Only one device is used to complete the testing of both channels at the same time, greatly improving testing efficiency.

[0036] like Figure 4 As shown in FIG, when testing a stylus having two groups of pressure sensing channels, a capacitance testing device including two pairs of conductive testing modules 2 is used. The structure of the stylus sensing area 1 is shown in FIG. Figure 2 and Figure 3 As shown, the stylus's structure, from inside out, consists of a steel refill 101, elastic foam 102, an array of pressure-sensing channels 103, an FPC module 104, several touch-sensing channels 105, and a pen housing 106. One pressure-sensing channel group includes several pressure-sensing channels, and two pressure-sensing channel groups are arranged front and back on the stylus.

[0037] As an optional embodiment, a set distance is set between each pair of conductive test modules 2, so that each pair of conductive test modules 2 is arranged in segments, and each pair of conductive test modules 2 acts on a group of pressure sensing channels one by one. Since the conductive test modules 2 do not completely wrap the stylus, the segmentation can cause the elastic foam 102 between each group of pressure sensing channels and the steel sheet pen core 101 to undergo local deformation, thereby changing the capacitance of the pressure sensing channel. The set distance between each pair of conductive test modules 2 is adjustable, and the set distance can be flexibly adjusted according to actual conditions and is not fixed. The set distance between each pair of conductive test modules 2 is equal or unequal; N pairs of conductive test modules 2 can be arranged at equal distances or at unequal distances, as long as each conductive test module 2 can act on a group of pressure sensing channels. The set distance between the two pairs of conductive test modules 2 cannot exceed the length of the stylus sensing area 1 to ensure that each pair of conductive test modules 2 can act on the stylus sensing area 1.

[0038] As an optional embodiment, the width of each pair of conductive test modules 2 is less than 1 / N of the length of the stylus's sensing area 1. Generally, each pressure-sensing channel of a stylus is of equal length, and the total length of each set of pressure-sensing channels equals the length of the sensing area 1. Setting the width of each pair of conductive test modules 2 to less than 1 / N of the length of the stylus's sensing area 1 ensures that the conductive test modules 2 act on only one set of pressure-sensing channels. If there are two sets of pressure-sensing channels, the width of the conductive test modules 2 should be less than 1 / 2 of the length of the sensing area 1.

[0039] As an optional embodiment, the total length of the width of each pair of conductive testing modules 2 plus the set distance between all conductive testing modules 2 is less than the length of the stylus sensing area 1. This can further ensure that each pair of conductive testing modules 2 can act on the stylus sensing area 1.

[0040] As an alternative embodiment, Figure 5 As shown, the capacitance test device is further provided with N-1 first conductive blocks 31 and N-1 second conductive blocks 32. Each upper conductive unit 21 is fixedly connected to the top by the N-1 first conductive blocks 31, and each lower conductive unit 22 is fixedly connected to the bottom by the N-1 second conductive blocks 32. To facilitate testing and operation of the capacitance test device, the head and tail of each pair of conductive test modules 2 can also be fixed by the first and second conductive blocks 32. This provides the same testing effect as a capacitance test device with adjustable spacing, but is more convenient for storage and accommodation.

[0041] As an optional embodiment, each pair of upper conductive units 21 and lower conductive units 22 is pressed together by pneumatic control. Each pair of conductive test modules 2 is pressed together by startup control, thereby realizing automation of the test.

[0042] As an optional embodiment, each pair of upper conductive units 21 and lower conductive units 22 is made of conductive silicone. Using conductive silicone as the upper conductive units 21 and lower conductive units 22 to press the stylus can simulate the action of a human finger squeezing the stylus, ensuring test accuracy.

[0043] Below, we take the stylus pressure sensing channel group as two groups as an example, combined with Figure 4-6 The working principle of the capacitance testing device for a touch pen provided in this embodiment is described in detail:

[0044] like Figure 6As shown in the figure, it is a schematic diagram of the pressure sensing channel routing on the back of the FPC module in the stylus sensing area 1. In the figure, there are 12 pressure sensing channels in total, divided into two groups on the left and right, with each group having 6 channels. The pressure sensing channel on the back of the FPC module is attached to the steel pen core 101 through elastic foam. The thickness of the elastic foam is the distance between the pressure sensing channel and the steel pen core 101. When the distance between them changes, the capacitance value of the pressure sensing channel will change. Figure 4 As shown, the two pairs of upper and lower conductive units 21 and 22 are pressed together using actuation control, acting only on the two ends of the pen's sensing area. Specifically, one pair of conductive test modules 2 acts on the six pressure-sensing channels in the left group, and the other pair of conductive test modules 2 acts on the six pressure-sensing channels in the right group. When the two silicone rubber pieces are pneumatically pressed together (simulating the action of a finger pinching a stylus), the two pairs of conductive test modules 2 squeeze the pen's body in sections, deforming the elastic foam and changing the distance between the pressure-sensing channels and the steel refill 101. This triggers a change in the capacitance of the two pressure-sensing channels. A change in capacitance indicates that the FPC module's pressure-sensing channels within the pen are functioning properly. Simultaneously, the touch-sensing channels can also be measured. When the conductive test modules 2 come into contact with the sensing area 1, they simulate a human finger touching the touch-sensing channels to generate coupling capacitance. If there is a capacitance change on each touch-sensing channel, it indicates that the FPC module's touch-sensing channels within the pen are functioning properly. Using a single device to simultaneously test both channels greatly improves testing efficiency.

[0045] The embodiment is only a special example and does not indicate that the present invention is implemented in such a way.

[0046] The above description is merely a preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A capacitance testing device for a touch pen, characterized in that: The invention is used for testing whether the sensing area (1) of a stylus pen is defective, and comprises N pairs of conductive test modules (2); each pair of the conductive test modules (2) comprises an upper conductive unit (21) and a lower conductive unit (22); a lower pen slot (211) is provided below each upper conductive unit (21); an upper pen slot (221) is provided above each lower conductive unit (22); the lower pen slot (211) of each upper conductive unit (21) is provided in one-to-one correspondence with the upper pen slot (221) of the lower conductive unit (22), and the stylus pen is engaged in the lower pen slot (211) and the upper pen slot (221).

2. The capacitance testing device for a touch pen according to claim 1, wherein: Each two pairs of the conductive test modules (2) are spaced apart by a set distance.

3. The capacitance testing device for a touch pen according to claim 2, wherein: The set distances between every two pairs of the conductive test modules (2) are equal or unequal.

4. The capacitance testing device for a touch pen according to claim 3, wherein: The width of each pair of the conductive test modules (2) is smaller than 1 / N of the length of the sensing area (1) of the stylus.

5. The capacitance testing device for a touch pen according to claim 3, wherein: The total length of the width of each pair of the conductive test modules (2) plus the set distance of all the conductive test modules (2) is less than the length of the sensing area (1) of the stylus.

6. The capacitance testing device for a touch pen according to claim 2, wherein: The set distance between each two pairs of the conductive test modules (2) is adjustable.

7. The capacitance testing device for a touch pen according to claim 1, characterized in that: The capacitance testing device is further provided with N-1 first conductive blocks (31) and N-1 second conductive blocks (32); the upper portion of each upper conductive unit (21) is fixedly connected via the N-1 first conductive blocks (31); and the lower portion of each lower conductive unit (22) is fixedly connected via the N-1 second conductive blocks (32).

8. The capacitance testing device for a touch pen according to claim 1, wherein: Each pair of the upper conductive unit (21) and the lower conductive unit (22) is pressed together by pneumatic control.

9. The capacitance testing device for a touch pen according to claim 1, wherein: The material of each pair of the upper conductive unit (21) and the lower conductive unit (22) is conductive silicone.

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