Flexible pressure-sensitive fiber fabric sensor

Abstract

The utility model discloses a flexible pressure-sensitive fiber fabric sensor which comprises an upper electrode base material, an upper electrode wiring layer, an upper sensitization conductive fabric layer, a flexible pressure-sensitive fiber fabric layer, a lower electrode base material, a lower electrode wiring layer and a lower sensitization conductive fabric layer, the upper electrode base material and the lower electrode base material are both used for providing mechanical support and surface protection, so that the sensor can be sewn to a sensor use terminal; the upper electrode wiring layer and the lower electrode wiring layer are both made of stainless steel wires, carbon fibers or silver fibers, the upper electrode wiring layer is sewn on the upper electrode base material, and the lower electrode wiring layer is sewn on the lower electrode base material; the upper sensitization conductive fabric layer covers the upper electrode wiring layer; the lower sensitization conductive fabric layer covers the lower electrode wiring layer; and the upper side surface of the flexible pressure-sensitive fiber fabric layer covers the upper sensitization conductive fabric layer, the upper electrode wiring layer and the upper electrode base material.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of sensor technical field, in particular to a kind of flexible pressure-sensitive fiber fabric sensor. BACKGROUND

[0002] Flexible pressure-sensitive fiber fabric sensor is a kind of novel sensor that combines flexible material, pressure-sensitive sensing element and textile fiber or fabric structure, which can sense external pressure or deformation in real time and convert it into electrical signal (such as resistance, capacitance or voltage change). Its core feature is flexible, wearable and high sensitivity, which can be seamlessly integrated into clothing, robot skin or medical devices to dynamically monitor pressure distribution. Flexible pressure-sensitive fiber fabric sensor has a wide range of applications, and can be used in mattress, pillow, car seat, smart wear, humanoid robot and other fields.

[0003] In the prior art, flexible pressure-sensitive fiber fabric sensor has the technical problems of unstable voltage, pressure resistance network attenuation and short service life. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a flexible pressure-sensitive fiber fabric sensor to solve the technical problems of unstable voltage, pressure resistance network attenuation and short service life in the prior art.

[0005] The utility model adopts the following technical scheme: a flexible pressure-sensitive fiber fabric sensor, comprising an upper electrode substrate, an upper electrode wiring layer, an upper sensitized conductive fabric layer, a flexible pressure-sensitive fiber fabric layer, a lower electrode substrate, a lower electrode wiring layer and a lower sensitized conductive fabric layer.

[0006] The upper electrode substrate and the lower electrode substrate are used to provide mechanical support and surface protection, so that the sensor can be sewn to the sensor terminal.

[0007] The upper electrode wiring layer and the lower electrode wiring layer are made of stainless steel wire, carbon fiber wire or silver fiber wire, the upper electrode wiring layer is sewn on the upper electrode substrate, and the lower electrode wiring layer is sewn on the lower electrode substrate.

[0008] The upper sensitized conductive fabric layer covers the upper electrode wiring layer.

[0009] The lower sensitized conductive fabric layer covers the lower electrode wiring layer.

[0010] The upper side of the flexible pressure-sensitive fiber fabric layer covers the upper sensitized conductive fabric layer, the upper electrode wiring layer and the upper electrode substrate, and the lower side of the flexible pressure-sensitive fiber fabric layer covers the lower sensitized conductive fabric layer, the lower electrode wiring layer and the lower electrode substrate.

[0011] In a possible implementation, the upper electrode wiring layer forms a longitudinal or transverse electrode grid on the upper electrode substrate, and the upper sensitized conductive fabric layer covers the electrode grid.

[0012] In a possible implementation, the lower electrode wiring layer forms a longitudinal or transverse electrode grid on the lower electrode substrate, and the lower sensitized conductive fabric layer covers the electrode grid.

[0013] In a possible implementation, the longitudinal or transverse electrode grid formed on the lower electrode substrate is perpendicular to the longitudinal or transverse electrode grid formed on the upper electrode substrate.

[0014] In a possible implementation, the upper sensitized conductive fabric layer and the lower sensitized conductive fabric layer are both formed by a plurality of conductive fabrics arranged longitudinally or transversely, and the conductive fabrics arranged longitudinally or transversely in the upper sensitized conductive fabric layer are perpendicular to the conductive fabrics arranged longitudinally or transversely in the lower sensitized conductive fabric layer.

[0015] In a possible implementation, the end of the upper electrode wiring layer forms a snap terminal to snap with the upper electrode substrate.

[0016] In a possible implementation, the end of the lower electrode wiring layer forms a snap terminal to snap with the lower electrode substrate.

[0017] In a possible implementation, the upper electrode substrate and the lower electrode substrate are both made of cloth or leather.

[0018] In a possible implementation, when the upper electrode wiring layer is made of stainless steel wire, the surface of the stainless steel wire is hot-melted to bond with the upper sensitized conductive fabric layer.

[0019] In a possible implementation, when the lower electrode wiring layer is made of stainless steel wire, the surface of the stainless steel wire is hot-melted to bond with the lower sensitized conductive fabric layer.

[0020] Compared with the prior art, the upper electrode wiring layer and the lower electrode wiring layer are both made of stainless steel wire, carbon fiber wire or silver fiber wire, and are respectively sewn on the upper electrode substrate and the lower electrode substrate, so that the tensile strength of the sensor can be improved, and the problem of electrode contact resistance drift over time can be solved. The upper surface and the lower surface of the flexible pressure-sensitive fiber fabric layer are respectively covered by the upper sensitized conductive fabric layer and the lower sensitized conductive fabric layer, so that the resistance drift caused by unilateral friction and wear can be avoided. The multilayer sandwich structure can solve the problems of unstable voltage of the flexible pressure-sensitive fiber fabric sensor, easy attenuation of the piezoresistive network, and short service life. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the flexible pressure-sensitive fiber fabric sensor of the utility model.

[0022] In the figure:

[0023] 1, upper electrode base material;

[0024] 2, upper electrode trace layer;

[0025] 3, upper sensitized conductive fabric layer;

[0026] 4, flexible pressure-sensitive fiber fabric layer;

[0027] 5, lower electrode base material;

[0028] 6, lower electrode trace layer;

[0029] 7, lower sensitized conductive fabric layer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0033] As Figure 1The flexible pressure sensitive fiber fabric sensor shown includes an upper electrode substrate 1, an upper electrode trace layer 2, an upper sensitized conductive fabric layer 3, a flexible pressure sensitive fiber fabric layer 4, a lower electrode substrate 5, a lower electrode trace layer 6 and a lower sensitized conductive fabric layer 7; the upper electrode substrate 1 and the lower electrode substrate 5 are used to provide mechanical support and surface protection, so that the sensor can be sewn to the sensor terminal; the upper electrode trace layer 2 and the lower electrode trace layer 6 are made of stainless steel wire, carbon fiber wire or silver fiber wire, the upper electrode trace layer 2 is sewn on the upper electrode substrate 1, and the lower electrode trace layer 6 is sewn on the lower electrode substrate 5; the upper sensitized conductive fabric layer 3 covers the upper electrode trace layer 2; the lower sensitized conductive fabric layer 7 covers the lower electrode trace layer 6; the upper side of the flexible pressure sensitive fiber fabric layer 4 covers the upper sensitized conductive fabric layer 3, the upper electrode trace layer 2 and the upper electrode substrate 1, and the lower side of the flexible pressure sensitive fiber fabric layer 4 covers the lower sensitized conductive fabric layer 7, the lower electrode trace layer 6 and the lower electrode substrate 5. It should be noted that the upper electrode substrate 1 and the lower electrode substrate 5 can cover the upper and lower sides of the flexible pressure sensitive fiber fabric layer 4 by sewing, the stainless steel wire, the carbon fiber wire or the silver fiber wire itself has the characteristics of anti-oxidation, resistance to sweat and corrosion of washing liquid, can improve the tensile strength of the sensor and prolong the service life of the sensor, the upper sensitized conductive fabric layer 3 and the lower sensitized conductive fabric layer 7 can expand the point contact into a surface contact, on the one hand, significantly reduce the interface contact impedance, on the other hand, form a soft cushion, absorb micro friction energy, inhibit the fiber powdering or filler migration caused by repeated compression, and delay the solidification of the persistent resistance network.

[0034] The upper electrode trace layer 2 and the lower electrode trace layer 6 are made of stainless steel wire, carbon fiber wire or silver fiber wire, and are respectively sewn on the upper electrode substrate 1 and the lower electrode substrate 5, which can improve the tensile strength of the sensor, and further solve the problem of electrode contact resistance drift over time, the upper and lower surfaces of the flexible pressure sensitive fiber fabric layer 4 are respectively covered by the upper sensitized conductive fabric layer 3 and the lower sensitized conductive fabric layer 7, which can avoid resistance drift caused by unilateral friction and wear, and the multi-layer sandwich structure can solve the problems of unstable voltage of the flexible pressure sensitive fiber fabric sensor, easy attenuation of the piezoresistive network and short service life.

[0035] In a possible implementation, the upper electrode trace layer 2 forms a longitudinal or transverse electrode grid on the upper electrode substrate 1, and the upper sensitized conductive fabric layer 3 covers the electrode grid. It should be noted that the upper electrode trace layer 2 is inlaid on the upper electrode substrate 1 in a grid shape, so that the metal wire and the substrate fiber are in a winding and embedding state, the tensile strength is improved, and it can resist million times of bending and stretching cycles, thereby solving the problem of upper electrode contact resistance drift over time.

[0036] In a possible implementation, the lower electrode wiring layer 6 forms a longitudinal or transverse electrode grid on the lower electrode substrate 5, and the lower conductive fabric layer 7 covers the electrode grid. It should be noted that the lower electrode wiring layer 6 is also woven into a grid shape on the lower electrode substrate 5, so that the metal wires are in a state of winding and embedding with the substrate fibers, thereby improving the tensile strength, enabling it to withstand millions of bending and stretching cycles, and thereby solving the problem of the contact resistance of the lower electrode drifting over time.

[0037] In a possible implementation, the longitudinal or transverse electrode grid formed on the lower electrode substrate 5 is perpendicular to the longitudinal or transverse electrode grid formed on the upper electrode substrate 1. It should be noted that the upper and lower electrode grids are arranged orthogonally at 90°, which facilitates matrix scanning to obtain a two-dimensional pressure distribution, while ensuring that the area of each sensing unit is consistent and reducing output unevenness.

[0038] In a possible implementation, the upper conductive fabric layer 3 and the lower conductive fabric layer 7 are both formed by a plurality of conductive fabrics arranged longitudinally or transversely, and the conductive fabrics arranged longitudinally or transversely in the upper conductive fabric layer 3 are perpendicular to the conductive fabrics arranged longitudinally or transversely in the lower conductive fabric layer 7. It should be noted that the conductive fabrics are arranged uniformly at intervals, and each conductive fabric is arranged along the corresponding electrode grid, so that each conductive fabric can cover the electrode grid, thereby increasing the sensing area of the electrode. Since the upper electrode grid is perpendicular to the lower electrode grid, the upper conductive fabric is perpendicular to the lower conductive fabric.

[0039] In a possible implementation, the end of the upper electrode wiring layer 2 forms a snap terminal that is snapped with the upper electrode substrate 1. It should be noted that the snap of the upper snap terminal with the upper electrode substrate 1 can improve the stability of the connection.

[0040] In a possible implementation, the end of the lower electrode wiring layer 6 forms a snap terminal that is snapped with the lower electrode substrate 5. It should be noted that the snap of the lower snap terminal with the lower electrode substrate 5 can improve the stability of the connection. The upper snap terminal corresponds to the lower snap terminal, and the terminal snap replaces the traditional stitching welding, thereby increasing the tensile strength and improving the external plug-in frequency and long-term reliability of the terminal.

[0041] In a possible implementation, the upper electrode substrate 1 and the lower electrode substrate 5 are both made of cloth or leather. It should be noted that the upper electrode substrate 1 and the lower electrode substrate 5 are both made of cloth or leather, which can be sewn and bent. The flexible cushioning effect can disperse macroscopic stress when the sensor is used at the terminal, avoid concentrated strain directly acting on the conductive circuit, and thereby reduce the probability of electrode wire breakage and resistance mutation from the root.

[0042] In a possible implementation, when the upper electrode wire layer 2 is made of stainless steel wire, the surface of the stainless steel wire is fused to bond with the upper sensitized conductive fabric layer 3. It should be noted that the conductive fabric of the upper sensitized conductive fabric layer 3 is bonded to the stainless steel wire by hot-melt adhesive to increase the sensing area, which is convenient and firm.

[0043] In a possible implementation, when the lower electrode wire layer 6 is made of stainless steel wire, the surface of the stainless steel wire is fused to bond with the lower sensitized conductive fabric layer 7. It should be noted that the conductive fabric of the lower sensitized conductive fabric layer 7 is bonded to the stainless steel wire by hot-melt adhesive to increase the sensing area, which is convenient and firm.

[0044] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A flexible pressure sensitive fabric sensor, characterized in that, The upper electrode substrate, the upper electrode trace layer, the upper conductive fabric layer, the flexible pressure sensitive fabric layer, the lower electrode substrate, the lower electrode trace layer and the lower conductive fabric layer are sequentially arranged. The upper electrode substrate and the lower electrode substrate are used to provide mechanical support and surface protection, so that the sensor can be sewn to the sensor terminal. The upper electrode trace layer and the lower electrode trace layer are made of stainless steel wire, carbon fiber wire or silver fiber wire, the upper electrode trace layer is sewn on the upper electrode substrate, and the lower electrode trace layer is sewn on the lower electrode substrate. The upper conductive fabric layer covers the upper electrode trace layer. The lower conductive fabric layer covers the lower electrode trace layer. The upper side of the flexible pressure sensitive fabric layer covers the upper conductive fabric layer, the upper electrode trace layer and the upper electrode substrate, and the lower side of the flexible pressure sensitive fabric layer covers the lower conductive fabric layer, the lower electrode trace layer and the lower electrode substrate.

2. The flexible pressure-sensitive fabric sensor of claim 1, wherein, The upper electrode trace layer forms a longitudinal or transverse electrode grid on the upper electrode substrate, and the upper conductive fabric layer covers the electrode grid.

3. The flexible pressure-sensitive fabric sensor of claim 2, wherein, The lower electrode trace layer forms a longitudinal or transverse electrode grid on the lower electrode substrate, and the lower conductive fabric layer covers the electrode grid.

4. The flexible pressure-sensitive fabric sensor of claim 3, wherein, The longitudinal or transverse electrode grid formed on the lower electrode substrate is perpendicular to the longitudinal or transverse electrode grid formed on the upper electrode substrate.

5. The flexible pressure-sensitive fabric sensor of claim 4, wherein, The upper conductive fabric layer and the lower conductive fabric layer are formed by arranging a plurality of conductive fabrics in the longitudinal or transverse direction, and the conductive fabrics arranged in the longitudinal or transverse direction in the upper conductive fabric layer are perpendicular to the conductive fabrics arranged in the longitudinal or transverse direction in the lower conductive fabric layer.

6. The flexible pressure-sensitive fabric sensor of claim 1, wherein, The end of the upper electrode trace layer forms a clamping terminal to clamp the upper electrode substrate.

7. The flexible pressure-sensitive fabric sensor of claim 1, wherein, The end of the lower electrode trace layer forms a clamping terminal to clamp the lower electrode substrate.

8. The flexible pressure-sensitive fabric sensor of claim 1, wherein, The upper electrode substrate and the lower electrode substrate are made of cloth or leather.

9. The flexible pressure-sensitive fabric sensor of claim 1, wherein, When the upper electrode trace layer is made of stainless steel wire, the surface of the stainless steel wire is hot-melted to bond with the upper conductive fabric layer.

10. The flexible pressure-sensitive fabric sensor of claim 1, wherein, When the lower electrode trace layer is made of stainless steel wire, the surface of the stainless steel wire is hot-melted to bond with the lower conductive fabric layer.

Images