Adjustable pressure sensor for flexible electronic skin
By employing partitioned or stacked distributions of conductive inks with different resistance values in flexible electronic skin, a multi-channel pressure signal sensor is constructed, overcoming the shortcomings of piezoresistive thin-film pressure sensors in terms of accuracy and range matching, and achieving improvements in sensitivity and adaptability.
Patent Information
- Application Number
- CN202522240636.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-23
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-10-23
AI Technical Summary
Existing piezoresistive thin-film pressure sensors cannot simultaneously meet multiple requirements in terms of accuracy and range, especially when sensing different pressure ranges, where the matching between accuracy and range is insufficient.
Conductive inks with different resistance values are distributed in layers or regions on a flexible sheet to form a stacked structure or partitioned arrangement, thus constructing a multi-channel pressure signal sensor. The resistance value is adjusted by regulating the ratio of low resistance to high resistance, achieving a balance between accuracy and range.
It achieves high accuracy in small ranges and extended range in large ranges, meeting various pressure sensing needs and improving the sensitivity and adaptability of the sensor.
Smart Images
Figure CN223636998U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pressure sensor technical field especially relates to a kind of for the regulating formula pressure sensor of flexible electronic skin. BACKGROUND
[0002] Electronic skin, also known as bionic skin or smart skin, is a new type of flexible electronic device that mimics or even surpasses the functions of human skin. It is usually made of soft, stretchable, and even self-repairable materials.
[0003] Electronic skin integrates different functional sensors (pressure, temperature, humidity, and chemistry) in high density on the same flexible substrate. As a multi-modal sensing component, electronic skin is applied in robots to detect pressure distribution, object hardness and surface texture. It can achieve safe interaction, real-time feedback of force, and avoid mechanical damage or human-machine collision. It can also adapt to the environment and conform to complex surfaces of robots, such as fingers and joints, to achieve dynamic response.
[0004] Due to the flexible, thin, and conformable characteristics of electronic skin, only thin film pressure sensors can perfectly match these requirements. Thin film pressure sensors are divided into piezoresistive, capacitive, and piezoelectric types.
[0005] The principle of piezoresistive thin film pressure sensors, which have the highest sensitivity, is to convert external pressure (or mechanical deformation) into detectable resistance changes using piezoresistive effect. Then, the resistance signal is read through the circuit to infer the size, distribution, or trend of pressure. Piezoresistive thin film pressure sensors have a typical "sandwich" flexible laminated structure, with a substrate with electrodes at the bottom, an ink layer in the middle, and a flexible electrode film at the top.
[0006] Conductive ink is the core material for preparing piezoresistive sensitive layers. It is essentially an "ink-like fluid containing conductive functional particles / materials" that is attached to a flexible substrate through printing, coating, or other processes. After solidification, it forms a thin film structure with conductive ability and piezoresistive sensitivity. Different resistances of conductive ink can affect the precision and range of piezoresistive thin film pressure sensors. Generally, high resistance conductive ink has a large range and small precision, while low resistance conductive ink has a small range and large precision. To address these characteristics, this application proposes a piezoresistive thin film pressure sensor that meets multiple requirements by changing the distribution of conductive ink. UTILITY MODEL CONTENTS
[0007] The utility model aims at: in order to solve the above problem, and propose a kind of for the regulating formula pressure sensor of flexible electronic skin.
[0008] To achieve the above purpose, the utility model adopts the following technical solutions:
[0009] An adjustable pressure sensor for flexible electronic skin, comprising a substrate and a flexible sheet, the substrate is integrated with a circuit composed of a positive electrode and a negative electrode, the flexible sheet is printed with an ink layer composed of a plurality of ink units, the ink units are composed of conductive ink with different resistances, and the conductive ink with different resistances forms a loop with the positive electrode and the negative electrode when the flexible sheet is deformed under pressure.
[0010] Preferably, the conductive ink with different resistances is distributed on the flexible sheet in layers to form a stacked structure.
[0011] Preferably, the conductive ink with different resistances is distributed on the flexible sheet in the shape of a "H" character, and the conductive ink with different resistances is located in the same plane.
[0012] Preferably, the ink units are divided into a plurality of regions, and the conductive ink with different resistances is distributed in different regions.
[0013] Preferably, each of the regions is of the same size and is located in the same plane and is distributed at equal angles.
[0014] Preferably, each of the regions is distributed with one or more resistances of conductive ink.
[0015] Preferably, the negative electrode comprises a plurality of electrically connected open ring ones, and each of the open ring ones is electrically connected with an open ring two.
[0016] Preferably, the open ring one and the open ring two are oriented in the same direction.
[0017] Preferably, the positive electrode comprises an open ring three corresponding to the open ring one and oriented in the opposite direction, and the inner side and the outer side of the open ring three are respectively provided with a lead one and a lead two.
[0018] Preferably, the end of the lead one is circularly arranged and concentrically arranged with the open ring one, the open ring two and the open ring three.
[0019] As described above, due to the adoption of the above technical scheme, the present application has the following beneficial effects:
[0020] In the present application, the ink layer is formed by a plurality of ink unit arrays, and each ink unit is composed of conductive ink with different resistances, and the conductive ink is arranged in different zones, and the sensitivity of the conductive ink with different resistances is different due to the different conductive particle concentrations of the conductive ink with different resistances, thereby constructing a "multi-channel pressure signal" and realizing a small range and high precision while improving the upper limit of the range of the entire sensor. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 The surface structure of the substrate according to the present application is shown.
[0022] Figure 2 The flexible sheet structure schematic diagram according to the embodiment 1 of the utility model is shown.
[0023] Figure 3 The flexible sheet structure schematic diagram according to the embodiment 2 of the utility model is shown.
[0024] Figure 4 The flexible sheet structure schematic diagram according to the embodiment 3 of the utility model is shown.
[0025] Figure 5 The negative electrode structure schematic diagram according to the utility model is shown.
[0026] Figure 6 The positive electrode structure schematic diagram according to the utility model is shown.
[0027] Legend:
[0028] 1, substrate; 2, circuit; 3, flexible sheet; 4, ink unit;
[0029] 21, positive electrode; 211, open ring three; 212, lead one; 213, lead two;
[0030] 22, negative electrode; 221, open ring one; 222, open ring two. DETAILED DESCRIPTION
[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0032] Embodiment 1
[0033] Please refer to Figure 1 、 Figure 3 、 Figure 5 and Figure 6 , the utility model provides a technical scheme:
[0034] A kind of for flexible electronic skin's adjustable pressure sensor, including substrate 1 and flexible sheet 3, flexible sheet 3 is attached on substrate 1, flexible sheet 3 substrate 1 is integrated with the circuit 2 being composed of positive electrode 21 and negative electrode 22, negative electrode 22 is array distribution, multiple contacts are equipped on each negative electrode 22, positive electrode 21 is independent structure, corresponding with the contact on negative electrode 22, this kind of setting mode can reduce external wiring, and overall volume is reduced, adaptation miniaturization installation demand;
[0035] The negative electrode 22 comprises a plurality of electrically connected open rings I 221, each of which is electrically connected with an open ring II 222, the open ring I 221 and the open ring II 222 have the same orientation, and the negative electrode 22 is an integral structure;
[0036] The positive electrode 21 comprises an open ring III 211 corresponding to the open ring I 221 and having an opposite orientation, the open ring III 211 is located between the open ring I 221 and the open ring II 222, the inner side and the outer side of the open ring III 211 are respectively provided with a lead wire I 212 and a lead wire II 213, the open ring III 211, the lead wire I 212 and the lead wire II 213 are an integral structure, the end of the lead wire I 212 is circularly arranged, extends into the inside of the open ring II 222, and is concentrically distributed with the open ring I 221, the open ring II 222 and the open ring III 211, the lead wire II 213 extends to the outside of the open ring I 221 through the gap of the open ring I 221, and the end of the lead wire II 213 is circularly arranged to increase the contact area, the positive electrode 21 and the negative electrode 22 are complementary in design, which reduces the area occupation of the substrate 1 and facilitates contact with the ink unit 4;
[0037] The flexible sheet 3 is printed with an ink layer composed of a plurality of ink units 4, the number of the ink units 4 corresponds to the number of the positive electrode 21, the ink units 4 are composed of conductive inks with different resistances, when the flexible sheet 3 is deformed under pressure, the conductive inks with different resistances form loops with the positive electrode 21 and the negative electrode 22, the conductive particles of the conductive inks with different resistances have different concentrations, the higher the concentration, the greater the contact probability between the particles, the denser the conductive path, and the lower the resistance of the ink, and vice versa.
[0038] In the application of robot manipulator, the low-resistance conductive ink has small range and high precision, and is used to perceive small pressure, such as paper and feather, and the high-resistance conductive ink has large range and small precision, and is used to perceive large pressure, such as metal block.
[0039] The conductive inks with different resistances are distributed on the flexible sheet 3 in layers, and the conductive inks with different resistances can be respectively contacted with the positive electrode 21 and the negative electrode 22 to form loops, in the printing process, the conductive inks with different resistances are printed in sequence, the conductive ink printed later directly covers the conductive ink printed earlier, forming a stacked structure.
[0040] Embodiment 2
[0041] Different from embodiment 1, please refer to Figure 2, the ink unit 4 is divided into three regions. The three regions are independently arranged with gaps between them. Conductive inks with different resistances are correspondingly distributed in different regions. The three regions are of the same size, located on the same plane, and are distributed at equal angles. Each region is distributed with one or more kinds of conductive inks with different resistances, and each region needs to be printed separately.
[0042] Embodiment 3
[0043] Different from Embodiment 1, please refer to Figure 1 and Figure 4 , conductive inks with different resistances are distributed in a "return" shape on the flexible sheet 3. The conductive inks with different resistances are located on the same plane. During the printing process of the conductive ink, starting from the conductive ink at the center point, it expands outwards in sequence. The conductive inks with different resistances will not overlap. There are certain requirements for the printing process, but it can save conductive ink. When the flexible sheet 3 is deformed under pressure, the conductive inks with different resistances can contact the positive electrode 21 and the negative electrode 22 and form a circuit.
[0044] Based on the above Embodiment 1 and Embodiment 2, in this application, the resistance size is adjusted by adjusting the ratio of the low resistance value to the high resistance value. It can be seen from Table 1 that in the same circuit, resistors of different sizes have different ranges and accuracies for the sensor.
[0045] Table 1
[0046]
[0047] Note: LR / HR is the ratio of the low resistance value to the high resistance value.
[0048] The above description of the embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A regulated pressure sensor for a flexible electronic skin, comprising a substrate (1) on which an electrical circuit (2) consisting of a positive electrode (21) and a negative electrode (22) is integrated, and a flexible sheet (3) on which an ink layer consisting of a plurality of ink cells (4) is printed, characterized in that, The ink unit (4) is composed of conductive inks with different resistances. When the flexible sheet (3) is deformed under pressure, the conductive inks with different resistances form a circuit with the positive electrode (21) and the negative electrode (22).
2. The tunable pressure sensor for flexible electronic skin of claim 1, wherein, The conductive inks with different resistances are distributed in layers on the flexible sheet (3) to form a stacked structure.
3. The tunable pressure sensor for flexible electronic skin of claim 1, wherein, The conductive inks with different resistances are distributed in a "return" shape on the flexible sheet (3), and the conductive inks with different resistances are located on the same plane.
4. The tunable pressure sensor for flexible electronic skin of claim 1, wherein, The ink unit (4) is divided into multiple regions, and the conductive inks with different resistances are correspondingly distributed in different regions.
5. The tunable pressure sensor for flexible electronic skin of claim 4, wherein, The size of each of the regions is the same, all located on the same plane, and distributed at equal angles.
6. A tunable pressure sensor for a flexible electronic skin according to claim 4 or 5, wherein, Each of the regions is distributed with one or more kinds of conductive inks with different resistances.
7. The tunable pressure sensor for flexible electronic skin of claim 1, wherein, The negative electrode (22) includes a plurality of electrically connected first open rings (221), and a second open ring (222) is electrically connected inside each of the first open rings (221).
8. The tunable pressure sensor for flexible electronic skin of claim 7, wherein, The first open ring (221) and the second open ring (222) face the same direction.
9. The tunable pressure sensor for flexible electronic skin according to claim 1 or 8, wherein, The positive electrode (21) includes a third open ring (211) corresponding to the first open ring (221) and facing in the opposite direction. A first lead (212) and a second lead (213) are provided inside and outside the third open ring (211) respectively.
10. The tunable pressure sensor for flexible electronic skin of claim 9, wherein, The end of the first lead (212) is circularly arranged and is concentrically distributed with the first open ring (221), the second open ring (222), and the third open ring (211).