Flexible stress sensor applied to membrane structure

Abstract

The utility model discloses a flexible stress sensor applied to a membrane structure, which comprises a polydimethylsiloxane flexible substrate, the top end of the polydimethylsiloxane flexible substrate is provided with a placing groove, the top end of the placing groove is provided with a thin film, the inner bottom end of the placing groove is provided with a sensing element, and the thin film is arranged in the placing groove. A first interdigital electrode and a second interdigital electrode are symmetrically arranged on the two sides of the sensing element, a positive electrode contact connected with the first interdigital electrode is arranged on the side, away from the sensing element, of the first interdigital electrode, and a negative electrode contact connected with the second interdigital electrode is arranged on the side, away from the sensing element, of the second interdigital electrode. The beneficial effects are that the protection assembly is arranged to protect the wire and prevent the wire from fracture failure caused by bending, the wire joint protection sleeve in the protection assembly can protect the wire joint part and prevent the wire joint part from being exposed to cause oxidation damage when the wire joint part is not used, and the safety is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a flexible stress sensor applied to a membrane structure. Background Art

[0002] With the development of wearable devices, flexible wearable stress sensors have become a hot topic in recent years because they can monitor a series of tiny biological signals such as joint movement, muscle movement, breathing rate, pulse beat and heart rate. The wearable stress sensor can achieve high sensitivity, fast response and high stability under the condition of small stress. At the same time, its high flexibility can stretch, bend and fold with the movement of the wearer, and can monitor human movement by recording its own current changes in real time.

[0003] The lead of the existing flexible stress sensor is connected to an external power source when in use, and disconnected from the power source when not in use. The lead is easily oxidized and damaged when exposed to the environment, which affects subsequent use.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related art, the utility model proposes a flexible stress sensor applied to a membrane structure to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A flexible stress sensor for membrane structure, comprising a polydimethylsiloxane flexible substrate, a placement groove is provided at the top of the polydimethylsiloxane flexible substrate, a thin film is provided at the top of the placement groove, a sensing element is provided at the bottom of the placement groove, symmetrically arranged interdigital electrodes 1 and 2 are provided on both sides of the sensing element, a positive contact connected to the interdigital electrode 1 is provided on the side away from the sensing element, a negative contact connected to the interdigital electrode 2 is provided on the side away from the sensing element, a wire extending to the outside of the polydimethylsiloxane flexible substrate is provided on both sides of the polydimethylsiloxane flexible substrate, and protective components matching the wires are provided on both sides of the polydimethylsiloxane flexible substrate.

[0008] Preferably, the polydimethylsiloxane flexible substrate is provided with adhesive tape on one side of the film.

[0009] Preferably, the sensing element, the first interdigital electrode, the second interdigital electrode, the positive electrode contact and the negative electrode contact are all attached to the polydimethylsiloxane flexible substrate.

[0010] Preferably, the protective component includes reinforcing sleeves provided on both sides of the polydimethylsiloxane flexible substrate and on the outer wall of the wire, the reinforcing sleeves are fixedly connected to the polydimethylsiloxane flexible substrate, and a wire joint protective sleeve is provided at the bottom end of the reinforcing sleeve, and the wire joint protective sleeve is connected to the reinforcing sleeve through a flexible belt.

[0011] Preferably, the reinforcement sleeve is made of silicone material.

[0012] Preferably, an elastic rubber pad is provided on the inner wall of the wire connector protective sleeve.

[0013] The beneficial effects of the utility model are as follows: by arranging a protection component, the wires can be protected to prevent the wires from breaking and malfunctioning due to bending; at the same time, the wire joint protection cover in the protection component can protect the wire joint part to prevent the wire joint part from being exposed to the outside and causing oxidation damage when not in use, thereby further improving its safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the overall structure of a flexible stress sensor applied to a membrane structure according to an embodiment of the utility model;

[0016] Figure 2 This is a front view of a flexible stress sensor applied to a membrane structure according to an embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of a polydimethylsiloxane flexible substrate in a flexible stress sensor applied to a membrane structure according to an embodiment of the utility model;

[0018] Figure 4 This is a top view of the interior of a polydimethylsiloxane flexible substrate in a flexible stress sensor applied to a membrane structure according to an embodiment of the utility model;

[0019] Figure 5 It is a cross-sectional view of a wire connector protective sleeve in a flexible stress sensor applied to a membrane structure according to an embodiment of the utility model.

[0020] In the figure:

[0021] 1. Polydimethylsiloxane flexible substrate; 2. Placement groove; 3. Film; 4. Sensing element; 5. Interdigital electrode 1; 6. Interdigital electrode 2; 7. Positive contact; 8. Negative contact; 9. Wire; 10. Adhesive tape; 11. Reinforcement sleeve; 12. Wire joint protective sleeve; 13. Flexible belt; 14. Elastic rubber pad. DETAILED DESCRIPTION

[0022] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] According to an embodiment of the present utility model, a flexible stress sensor applied to a membrane structure is provided.

[0024] Embodiment 1;

[0025] like Figure 1-5 As shown, according to an embodiment of the utility model, a flexible stress sensor applied to a membrane structure includes a polydimethylsiloxane flexible substrate 1, a placement groove 2 is provided at the top of the polydimethylsiloxane flexible substrate 1, a thin film 3 is provided at the top of the placement groove 2, a sensing element 4 is provided at the bottom end of the placement groove 2, and symmetrically arranged interdigitated electrodes 5 and interdigitated electrodes 6 are provided on both sides of the sensing element 4, a positive contact 7 connected to the interdigitated electrode 1 5 is provided on the side away from the sensing element 4, and a negative contact 8 connected to the interdigitated electrode 2 6 is provided on the side away from the sensing element 4, a wire 9 extending to the outside of the polydimethylsiloxane flexible substrate 1 is provided on the positive contact 7 and the negative contact 8, and protective components matching the wire 9 are provided on both sides of the polydimethylsiloxane flexible substrate 1.

[0026] Embodiment 2:

[0027] like Figure 1-5As shown, it comprises a polydimethylsiloxane flexible substrate 1, a placement groove 2 is provided at the top of the polydimethylsiloxane flexible substrate 1, a film 3 is provided at the top of the placement groove 2, a sensor element 4 is provided at the bottom of the placement groove 2, and a symmetrically arranged interdigital electrode 1 5 and an interdigital electrode 2 6 are provided on both sides of the sensor element 4, a positive contact 7 connected to the interdigital electrode 1 5 is provided on the side away from the sensor element 4, and a negative contact 8 connected to the interdigital electrode 2 6 is provided on the side away from the sensor element 4, and a wire 9 extending to the outside of the polydimethylsiloxane flexible substrate 1 is provided on both sides of the polydimethylsiloxane flexible substrate 1, and protective components matching the wire 9 are provided on both sides of the polydimethylsiloxane flexible substrate 1. A tape 10 is provided on one side of the polydimethylsiloxane flexible substrate 1 located on the film 3. The sensor element 4, the interdigital electrode 1 5, the interdigital electrode 2 6, the positive contact 7 and the negative contact 8 are all attached to the polydimethylsiloxane flexible substrate 1. The protection component includes a reinforcing sleeve 11 which is provided on both sides of the polydimethylsiloxane flexible substrate 1 and is located on the outer wall of the wire 9. The reinforcing sleeve 11 is fixedly connected to the polydimethylsiloxane flexible substrate 1. A wire joint protective sleeve 12 is provided at the bottom of the reinforcing sleeve 11. The wire joint protective sleeve 12 is connected to the reinforcing sleeve 11 through a flexible belt 13. The reinforcing sleeve 11 is made of silicone material. An elastic rubber pad 14 is provided on the inner wall of the wire joint protective sleeve 12.

[0028] In actual application, the side of the polydimethylsiloxane flexible substrate 1 with the film 3 is pasted on the skin through the tape 10. When the skin squeezes the film 3, the sensor element 4 receives the external stress change, and then the conductive fiber composite structure in the sensor element 4 undergoes microscopic deformation, causing its resistance to change, thereby changing the current in the sensor element 4. The external stress and strain will be converted into a current output signal, thereby realizing the detection of human micro-movement. In this process, the reinforcing sleeve 11 can protect the wire 9 to prevent the wire 9 from bending and breaking. When the sensor element 4 is not in use, the wire 9 can be disconnected from the external power supply, and the wire joint protective sleeve 12 can be put on the joint of the wire 9 to prevent it from contacting the external environment and causing oxidation damage. The elastic rubber pad 14 in the wire joint protective sleeve 12 squeezes the wire 9 to make it firmly connected and prevent it from falling off.

[0029] To sum up, with the help of the above-mentioned technical scheme of the utility model, the wires can be protected by setting up a protective component to prevent the wires from breaking and failing due to bending. At the same time, the wire joint protective cover in the protective component can protect the wire joint part to prevent the wire joint part from being exposed to the outside and causing oxidation damage when not in use, thereby further improving its safety.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible stress sensor for a membrane structure, comprising a polydimethylsiloxane flexible substrate (1), characterized in that: The polydimethylsiloxane flexible substrate (1) has a placement groove (2) at the top, a film (3) at the top, a sensor element (4) at the bottom of the placement groove (2), symmetrically arranged interdigital electrodes (5) and (6) at both sides of the sensor element (4), a positive electrode contact (7) connected to the interdigital electrode (5) at a side away from the sensor element (4), a negative electrode contact (8) connected to the interdigital electrode (6) at a side away from the sensor element (4), a conductive wire (9) extending to the outside of the polydimethylsiloxane flexible substrate (1) is provided on both sides of the polydimethylsiloxane flexible substrate (1), and protective components matching the conductive wire (9) are provided on both sides of the polydimethylsiloxane flexible substrate (1).

2. The flexible stress sensor applied to a membrane structure according to claim 1, characterized in that: The polydimethylsiloxane flexible substrate (1) is provided with an adhesive tape (10) on one side of the film (3).

3. The flexible stress sensor applied to a membrane structure according to claim 1, characterized in that: The sensing element (4), the interdigital electrode 1 (5), the interdigital electrode 2 (6), the positive electrode contact (7) and the negative electrode contact (8) are all attached to the polydimethylsiloxane flexible substrate (1).

4. The flexible stress sensor for membrane structure according to claim 1, characterized in that: The protective component comprises a reinforcing sleeve (11) provided on both sides of the polydimethylsiloxane flexible substrate (1) and on the outer wall of the conductive wire (9), the reinforcing sleeve (11) being fixedly connected to the polydimethylsiloxane flexible substrate (1), a conductive wire joint protective sleeve (12) being provided at the bottom end of the reinforcing sleeve (11), and the conductive wire joint protective sleeve (12) being connected to the reinforcing sleeve (11) via a flexible belt (13).

5. The flexible stress sensor applied to a membrane structure according to claim 4, characterized in that: The reinforcing sleeve (11) is made of silicone material.

6. The flexible stress sensor applied to a membrane structure according to claim 4, characterized in that: An elastic rubber pad (14) is provided on the inner wall of the wire connector protective sleeve (12).

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