Pressure sensor structure with conductive silica gel

Abstract

The utility model discloses a pressure sensor structure with conductive silica gel, and particularly relates to the field of electronic components, the pressure sensor structure comprises a flexible circuit, the lower part of the front surface of the flexible circuit is covered with a connection contact, and the geometric center of the connection contact is provided with a connection through hole. According to the utility model, through cooperation between the arranged threaded electrode and the P I pad material, when the intelligent pen core is applied to sensing of electric signals in the intelligent pen in the later period, the conductive silica gel is pressed through the trigger mechanism connected with the intelligent pen core, and the contact area and the fitting tightness of the conductive silica gel and the threaded electrode are controlled to be different; different pressing forces are converted into deformation of the conductive silica gel and then are converted into change of conduction resistance of the threaded electrodes, so that conversion from pressure signals to electric signals is completed, and due to the fact that the conductive silica gel has certain conductivity, after the conductive silica gel is in contact with the threaded electrodes, the threaded electrodes have certain resistance instead of being conducted, and the pressure signals are converted into the electric signals. And the resistance value is related to the contact surface of the conductive silica gel and the threaded electrode.

Description

Technical Field

[0001] The utility model relates to the field of electronic components, and more specifically, to a pressure sensor structure with conductive silica gel. Background Art

[0002] In the field of smart pens, flexible film pressure sensors are often used. Pressure sensors are devices that can sense pressure signals and convert them into usable output electrical signals according to certain rules. Pressure sensors are usually composed of pressure sensitive elements and signal processing units:

[0003] When the pressure sensor in the existing smart pen is in use, since the current pressure sensor adopts a flexible adjustment method, some sensors adopt flexible adjustment resistance value internally, thereby changing the change of voltage signal to complete the pressure sensing. In the existing adjustment method, a flexible film is covered with silver paste or carbon paste on one side, and then the film and electrode are contacted by external pressing to complete the sensing. However, this kind of process has high requirements for assembly and relatively precise requirements for the size of the materials when in use, and there are still certain limitations.

[0004] Therefore, in order to solve the above problems, a pressure sensor structure with conductive silicone is proposed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a pressure sensor structure with conductive silicone to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure sensor structure with conductive silicone, comprising a flexible circuit, the front side of the flexible circuit is covered with a connection contact below, a connection through hole is opened at the geometric center of the connection contact, a copper foil is fixedly connected to the back side of the connection through hole, a threaded electrode is connected to the top of the copper foil, the back side of the threaded electrode is covered with a first reinforcement sheet, one side of the threaded electrode is provided with conductive silicone, and a gap is left between the threaded electrode and the conductive silicone.

[0007] Preferably, the first reinforcing sheet covers and adheres to the front side of the flexible circuit, PI pads are provided on both sides of the threaded electrode, and the PI pads are adhered to both sides of the threaded electrode on the back side of the flexible circuit.

[0008] Preferably, the front side of the PI pad material is in contact with the inner wall of the conductive silicone, and the material of the PI pad material is polyimide engineering plastic.

[0009] Preferably, two threaded electrodes are provided, and the two threaded electrodes are not in contact with each other, and both end portions of the two threaded electrodes are respectively connected to the two groups of copper foils.

[0010] Preferably, the conductive silicone is placed above the PI pad and forms a certain gap with the threaded electrode.

[0011] Preferably, a first reinforcing sheet is provided above the front side of the flexible circuit, and a double-sided adhesive film is provided above the first reinforcing sheet. The upper back side of the flexible circuit is a threaded electrode, and the cumulative thickness range of the double-sided adhesive film, the first reinforcing sheet, the flexible circuit and the PI pad is 0.35±0.03MM; a second reinforcing sheet is attached to the lower back side of the flexible circuit, and the cumulative thickness range of the second reinforcing sheet and the flexible circuit is 0.25±0.03MM.

[0012] Preferably, pressing the conductive silicone rubber controls the conductive silicone rubber to make contact with the threaded electrodes at the rear end, thereby controlling the closed-circuit connection of the electrical signals of the two groups of threaded electrodes.

[0013] Technical effects and advantages of the utility model:

[0014] 1. Compared with the prior art, the pressure sensor structure with conductive silicone is used for the internal electrical signal sensing of the smart pen in the future through the cooperation between the threaded electrode and the PI pad material. The conductive silicone body is pressed by the switch to control the conductive silicone to be pressed inward, so as to connect with the two ends of the threaded electrode. At the same time, the threaded electrode is connected through the conductive silicone to form a complete loop, so as to control the connection contact to connect the electrical signal, thereby forming the connection of the sensor. The design of conductive silicone is used for the internal electrical signal transmission of the smart pen in the future. Compared with the traditional pressure sensor, the trigger force is adjusted by adjusting the parameters of the FPC wiring structure to achieve a more sensitive response. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the connection contact structure of the utility model.

[0016] Figure 2 This is a schematic diagram of the threaded electrode structure of the utility model.

[0017] Figure 3 This is a schematic diagram of the conductive silicone structure of the utility model.

[0018] Figure 4 This is a schematic diagram of the PI cushion material structure of the utility model.

[0019] Figure 5 This is a schematic diagram of the conductive silicone structure of the utility model.

[0020] Figure 6This is a schematic diagram of the structure of the first reinforcing sheet of the utility model.

[0021] The accompanying drawings are marked as follows: 1. double-sided adhesive film; 2. connecting contacts; 3. connecting through holes; 4. threaded electrodes; 5. copper foil; 6. second reinforcing sheet; 7. first reinforcing sheet; 8. PI pad material; 9. flexible circuit; 10. conductive silicone. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] As attached Figures 1 to 6 A pressure sensor structure with conductive silicone is shown, including a flexible circuit 9, a connection contact 2 is covered on the lower front of the flexible circuit 9, a connection through hole 3 is opened at the geometric center of the connection contact 2, a copper foil 5 is fixedly connected to the back of the connection through hole 3, a threaded electrode 4 is connected above the copper foil 5, the back of the threaded electrode 4 is covered with a first reinforcement sheet 7, a conductive silicone 10 is provided on one side of the threaded electrode 4, and a gap is left between the threaded electrode 4 and the conductive silicone 10.

[0025] In this embodiment, the first reinforcing sheet 7 covers and fits on the front side of the flexible circuit 9, and PI pads 8 are provided on both sides of the threaded electrode 4 to fit on both sides of the threaded electrode 4 on the back side of the flexible circuit 9. When working, the device uses the PI pad 8 to support the conductive silicone rubber 10 on the outside as a whole, and at the same time forms a certain gap between the threaded electrode 4 to leave space for pressing the conductive silicone rubber later.

[0026] In this embodiment, the front side of the PI pad 8 is attached to the inner wall of the conductive silicone 10. The material of the PI pad 8 is polyimide engineering plastic. When working, the PI pad 8 of the device is made of engineering plastic and is used as a pad with insulation properties.

[0027] In this embodiment, two threaded electrodes 4 are provided, and the two threaded electrodes 4 are not in contact with each other, and the two ends of the two threaded electrodes 4 are respectively connected to two groups of copper foils 5. When working, the device adopts a special design of threaded electrodes, and there is no connection between the two groups of threaded electrodes. When the conductive silicone 10 is pressed, the contact surface is larger, and it is not easy to have a non-touch situation.

[0028] In this embodiment, the conductive silicone 10 is placed above the PI pad 8 and forms a certain gap with the threaded electrode 4, and the gap is used for pressing the conductive silicone 10 for contact later, and the outer surface of the first reinforcement sheets 6 and 7 is also covered with a layer of double-sided adhesive film for assembling and fixing the sensor.

[0029] In this embodiment, a first reinforcing sheet 7 is provided above the front side of the flexible circuit 9, and a double-sided adhesive film 1 is covered on the top of the first reinforcing sheet 7. A first reinforcing sheet 6 is attached to the bottom of the back side of the flexible circuit 9, and a surface of the first reinforcing sheet 6 is covered with a double-sided adhesive film 1. When working, the sensor is attached to the corresponding cavity position of the pen through the double-sided adhesive film 1, and the double-sided adhesive film 1 can protect the outer wall of the sensor.

[0030] In this embodiment, pressing the conductive silicone 10 controls the conductive silicone 10 to touch the threaded electrode 4 at the rear end, thereby controlling the closed-circuit connection of the electrical signals of the two groups of threaded electrodes 4. When working, the user presses the conductive silicone 10 through the trigger mechanism connected to the smart pen core to control the contact area and the degree of tightness between the conductive silicone 10 and the threaded electrode 4, and converts the different pressing forces into deformation of the conductive silicone 10, and then into changes in the on-resistance of the threaded electrode, completing the conversion of the pressure signal to the electrical signal. Since the conductive silicone has a certain conductivity, after the conductive silicone 10 contacts the threaded electrode 4, the threaded electrodes 4 change from being non-conductive to having a certain resistance, and the resistance value is related to the contact surface between the conductive silicone and the threaded electrode.

[0031] The working process of the utility model is as follows:

[0032] When this pressure sensor structure with conductive silicone is applied to a smart pen in the later stage, it is connected to the smart pen circuit through the connecting contact 2, and the electrical signal is transmitted to the back copper foil 5 through the connecting hole 3 via the contact 2, and then the electrical signal is transmitted to the upper threaded electrode 4. At the same time, the two groups of threaded electrodes 4 are not connected. At the same time, the PI pads 8 set at both ends of the threaded electrodes 4 are used for support. At this time, the smart pen switch is pressed, thereby driving the conductive silicone 10 at the front end of the PI pad 8 to be squeezed inward to connect the two groups of threaded electrodes 4, thereby forming an electrical signal transmission, thereby realizing the working process of the pressure sensor.

[0033] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pressure sensor structure with conductive silicone, comprising a flexible circuit (9), characterized in that; The front side of the flexible circuit (9) is covered with a connection contact (2) below, a connection through hole (3) is provided at the geometric center of the connection contact (2), a copper foil (5) is fixedly connected to the back side of the connection through hole (3), a threaded electrode (4) is connected to the top of the copper foil (5), the back side of the threaded electrode (4) is covered with a first reinforcing sheet (7), a conductive silicone rubber (10) is provided on one side of the threaded electrode (4), and a gap is left between the threaded electrode (4) and the conductive silicone rubber (10).

2. A pressure sensor structure with conductive silicone according to claim 1, characterized in that: The first reinforcing sheet (7) covers and adheres to the front side of the flexible circuit (9), and PI pads (8) are provided on both sides of the threaded electrode (4).

3. The pressure sensor structure with conductive silicone according to claim 2, characterized in that: The front side of the PI pad material (8) is bonded to the inner wall of the conductive silica gel (10).

4. The pressure sensor structure with conductive silicone according to claim 2, characterized in that: Two threaded electrodes (4) are provided, and the two threaded electrodes (4) are not in contact with each other, and the two end portions of the two threaded electrodes (4) are respectively connected to the two groups of copper foils (5).

5. The pressure sensor structure with conductive silicone according to claim 2, characterized in that: The conductive silica gel (10) is placed on the PI pad (8) and forms a certain gap with the threaded electrode (4).

6. The pressure sensor structure with conductive silicone according to claim 1, characterized in that: A first reinforcing sheet (7) is arranged above the front side of the flexible circuit (9), and a double-sided adhesive film (1) is covered above the first reinforcing sheet (7). The upper back side of the flexible circuit (9) is a threaded electrode (4), and the cumulative thickness of the double-sided adhesive film (1), the first reinforcing sheet (7), the flexible circuit (9), and the PI pad (8) is in the range of 0.35±0.03MM; a second reinforcing sheet (6) is attached to the lower back side of the flexible circuit (9), and the cumulative thickness of the second reinforcing sheet (6) and the flexible circuit (9) is in the range of 0.25±0.03MM.

7. The pressure sensor structure with conductive silicone according to claim 1, characterized in that: Pressing the conductive silicone rubber (10) controls the conductive silicone rubber (10) to make contact with the threaded electrode (4) at the rear end, thereby controlling the closed-circuit connection of the electrical signals of the two groups of threaded electrodes (4).

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