Inductive film and smart floor

Abstract

The application discloses an inductive film and a smart floor. The inductive film comprises a substrate, a resistive pressure sensor and an electromagnetic inductive sensor formed on the substrate. The resistive pressure sensor is used for sensing the pressure applied on the inductive film, and the electromagnetic inductive sensor is used for sensing the bioelectric field acting on the inductive film. The inductive film and the smart floor can effectively improve the monitoring precision and sensitivity of the smart floor to the standing posture, walking state and motion track of the monitored person by the combined action of the resistive pressure sensor and the electromagnetic inductive sensor arranged in the inductive film.

Description

Technical Field

[0001] The present invention relates to sensor technology and the field of smart home, and in particular to a sensing film and a smart floor. Background Art

[0002] With the development of the Internet of Things, information technology, and artificial intelligence, a future unmanned, fully automated society is gradually becoming possible. The use of sensors to monitor and identify pedestrian flows in public or specific areas is a rapidly developing area. In nursing homes, monitoring the movement and posture of residents, while ensuring privacy and minimizing disruption, combined with big data analysis, can provide staff with behavioral analysis, traffic statistics, and fall alerts. In large shopping malls, tracking consumer location and behavior and applying data analysis techniques can quickly provide merchants with high-value business information, such as shelf status tracking, customer entry and exit statistics, and consumer preference analysis.

[0003] Currently, video surveillance and machine vision methods based on visual sensors are widely used to obtain information about people in monitored areas. With the rise of machine learning methods such as deep learning and convolutional neural networks, the performance of these methods has greatly improved. However, they also have certain drawbacks. For example, visual sensors can interfere with people's privacy needs and make people feel like they are being monitored. Furthermore, visual sensors consume a lot of computing power and energy, resulting in high power and hardware costs.

[0004] Therefore, it is necessary to provide a sensing film and a smart floor to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a sensing film and a smart floor, which can effectively monitor the standing posture, walking status and movement trajectory of people located on the smart floor.

[0006] To achieve the above-mentioned objectives, the present invention provides a sensing film for use in smart floors. The sensing film includes a substrate and a resistive pressure sensor and an electromagnetic induction sensor formed on the substrate. The resistive pressure sensor is used to sense the pressure applied to the sensing film, and the electromagnetic induction sensor is used to sense the bioelectric field acting on the sensing film.

[0007] In one or more embodiments, the substrate includes a first base, an isolation layer, and a second base stacked in sequence; the first mounting surface of the first base is connected to the isolation layer, and the second mounting surface of the second base is connected to the isolation layer.

[0008] In one or more embodiments, the resistive pressure sensor includes an electrode unit disposed on the first mounting surface and a pressure sensing unit disposed on the second mounting surface. Under the action of external force, the electrode unit and the pressure sensing unit can contact each other to generate an electrical signal.

[0009] In one or more embodiments, the electrode unit and the pressure sensing unit are arranged opposite to each other, and the insulating layer has connection holes corresponding to the electrode unit and the pressure sensing unit, and the connection holes are used for contact between the electrode unit and the pressure sensing unit.

[0010] In one or more embodiments, an air guide groove communicating with the connection hole is provided on the rubber isolation layer, and the connection hole is communicated with the outside through the air guide groove.

[0011] In one or more embodiments, the electrode unit is an interdigitated electrode structure.

[0012] In one or more embodiments, the second substrate has a third mounting surface opposite to the second mounting surface, and the electromagnetic induction sensor includes a sensing unit disposed on the third mounting surface, wherein the sensing unit includes an induction coil and a carbon paste block covering the induction coil.

[0013] In one or more embodiments, the electromagnetic induction sensor includes a shielding unit disposed on the second mounting surface.

[0014] In one or more embodiments, projections of the resistive pressure sensor and the electromagnetic induction sensor on the second mounting surface are intertwined.

[0015] The present invention provides a smart floor, comprising:

[0016] ground body;

[0017] The above-mentioned induction film is laid on the ground body;

[0018] The protective layer is laid on the sensing film.

[0019] Compared with the existing technology, the sensing film and smart floor according to the present invention can effectively improve the monitoring accuracy and sensitivity of the smart floor on the standing posture, walking status and movement trajectory of the monitored person through the cooperation of the resistive pressure sensor and the electromagnetic induction sensor set in the sensing film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded view of a smart floor according to one embodiment of the present invention;

[0021] Figure 2is a schematic diagram of a sensing film according to one embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of an electrode unit of a resistive pressure sensor according to an embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of an insulating layer according to one embodiment of the present invention;

[0024] Figure 5 is an exploded view of a sensing film according to one embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of a sensing unit of an electromagnetic induction sensor device according to an embodiment of the present invention;

[0026] Figure 7 FIG. 1 is a projection diagram of a resistive pressure sensor and an electromagnetic induction sensor on a second mounting surface according to an embodiment of the present invention.

[0027] Description of main reference numerals:

[0028] 1. Ground body; 2. Sensing film; 21. Base material; 22. Resistive pressure sensor; 221. Electrode unit; 222. Pressure sensing unit; 23. Electromagnetic induction sensor; 231. Sensing unit; 2311. Sensing coil; 2312. Carbon pulp block; 232. Shielding unit; 211. First substrate; 2111. First mounting surface; 212. Glue insulation layer; 2121. Connection hole; 2122. Air guide groove; 213. Second substrate; 2131. Second mounting surface; 2132. Third mounting surface; 3. Protective layer. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0030] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0031] like Figure 1 As shown, the smart floor according to one embodiment of the present invention includes a floor body 1 , a sensing film 2 laid on the floor body 1 , and a protective layer 3 laid on the sensing film 2 .

[0032] Specifically, the smart floor adopts a "sandwich" structure, and the sensing film 2 is arranged between the floor body 1 and the protective layer 3 through bonding technology.

[0033] It should be noted that the floor surface 1 can be considered to be a naturally occurring or artificially poured floor. The protective layer 3 can be made of ceramic tile, marble, wooden flooring, carpet, or PVC flooring, etc., and serves to protect the sensing film 2, preventing the monitored person from direct contact with the sensing film 2, thereby extending the service life of the sensing film 2 and ensuring its monitoring sensitivity and accuracy.

[0034] It can be understood that the sensing film 2 in the smart floor of the present invention can be connected to the cloud or processor, and the sensing film 2 transmits the detected signal or information to the cloud or processor. The cloud or processor performs processing, calculation, judgment and other steps based on the received signal or information, thereby determining the standing posture, walking status, movement trajectory and other information of the monitored person on the smart floor.

[0035] like Figure 2 、 Figure 5 and Figure 7 As shown, in a specific embodiment, the sensing film 2 includes a substrate 21 and a resistive pressure sensor 22 and an electromagnetic induction sensor 23 formed on the substrate 21. The resistive pressure sensor 22 is used to sense the pressure applied to the sensing film 2, and the electromagnetic induction sensor 23 is used to sense the bioelectric field information of the human body acting on the sensing film 2. The cloud or processor preliminarily infers the status of the monitored person, such as standing, walking, lying down, etc., based on the electromagnetic field information sensed by the electromagnetic induction sensor 23.

[0036] like Figure 6 Specifically, the electromagnetic induction sensor 23 may include a sensing unit 231 for sensing bioelectric field information. The sensing unit 231 of the electromagnetic induction sensor 23 utilizes a single-layer electrode structure and includes an induction coil 2311 and a carbon paste block 2312. The induction principle of the induction unit 231 is to charge the induction coil 2311, thereby generating a capacitance value between the induction coil 2311 and the carbon paste block 2312. When a person or other organism steps on the sensing film 2, the bioelectric field of the person or other organism changes the original capacitance value of the sensing unit 231. When the detection circuit in the electromagnetic induction sensor 23 detects a corresponding change in the capacitance value of the sensing unit 231, it indicates that the electromagnetic induction sensor 23 has sensed the bioelectric field of the human body or other organism.

[0037] It should be noted that the resistive pressure sensor 22 can sense changes in pressure acting on the sensing film 2 and convert the pressure change value into a resistance change value, thereby outputting information. The electromagnetic induction sensor 23 can sense the bioelectric field of a person or other organism acting on the sensing film 2. The bioelectric field causes the capacitance value of the sensing unit 231 within the electromagnetic induction sensor 23 to change, and the capacitance value change information is output to an external cloud or processor. The cloud or processor receives the information transmitted by the two sensors, analyzes them separately, and obtains preliminary inference results. The preliminary inference results obtained by the two sensors are then summarized and comprehensively analyzed and calculated to obtain the final result. The final result is derived from the combined inference of the sensing information of the two sensors, and the result is more accurate. Therefore, it can be considered that the sensing film 2 and the smart floor of the present invention can effectively improve the monitoring accuracy and sensitivity of the smart floor to the standing posture, walking state, and movement trajectory of the monitored person, and has the advantages of multi-dimensional sensing, high accuracy, and good stability.

[0038] It is understood that the electromagnetic induction sensor 23 senses bioelectric field information. Specifically, when a person passes over the sensing film 2, the human bioelectric field affects the charge distribution on the induction coil 2311, causing the capacitance of the induction coil 2311 to change. Of course, if an animal or other organism passes over the sensing film 2, the electromagnetic induction sensor 23 will also respond, causing the capacitance of the electromagnetic induction sensor 23 to change. At this point, the cloud or processor will make a comprehensive assessment based on the information from the electromagnetic induction sensor 23 and the resistive pressure sensor 22 to determine the specific situation.

[0039] Specifically, the sensing distance of the electromagnetic induction sensor 23 can be selected according to needs. For example, in a shopping mall, the maximum sensing distance of the electromagnetic induction sensor 23 only needs to be within 10 cm from the upper surface of the protective layer 3.

[0040] like Figure 2 As shown, in one embodiment, the substrate 21 includes a first base 211, an insulating layer 212, and a second base 213 stacked in sequence. The first mounting surface 2111 of the first base 211 is connected to the insulating layer 212, and the second mounting surface 2131 of the second base 213 is connected to the insulating layer 212. Specifically, the first base 211 and the second base 213 are respectively attached to opposite sides of the insulating layer 212.

[0041] Preferably, the first substrate 211 , the rubber barrier layer 212 and the second substrate 213 may all be PE films, PET films or PI films; and the thicknesses of the first substrate 211 , the rubber barrier layer 212 and the second substrate 213 may all be controlled within a range of 100 to 200 μm.

[0042] like Figure 2 、 Figure 3 and Figure 5 As shown, in one embodiment, the resistive pressure sensor 22 includes an electrode unit 221 disposed on a first mounting surface 2111 and a pressure sensing unit 222 disposed on a second mounting surface 2131. Under the action of an external force, the electrode unit 221 and the pressure sensing unit 222 can contact each other to generate an electrical signal. It is understood that to improve the sensitivity and accuracy of the sensing film 2, multiple resistive pressure sensors 22 can be mounted in an array on the substrate 21; or a single resistive pressure sensor 22 can include multiple groups of electrode units 221 and pressure sensing units 222 distributed in an array.

[0043] like Figure 3 As shown, preferably, the electrode unit 221 is an interdigital electrode structure. The interdigital electrode structure mainly includes four structural parameters, namely, the number of interdigital pairs, the width of the interdigital fingers, the spacing between the interdigital fingers, and the thickness of the interdigital fingers. The more interdigital pairs there are, the larger the sensor signal that can be detected; the larger the aspect ratio of the interdigital electrodes, the greater the density of the interdigits, and the smaller the spacing between adjacent interdigits, the higher the sensitivity and response speed of the sensor. Therefore, by adjusting the four structural parameters of the interdigital electrode structure, the performance parameters of the resistive pressure sensor 22, such as sensitivity, response time, and signal value, can be adjusted.

[0044] like Figures 2 to 5 As shown, specifically, the electrode unit 221 and the pressure sensing unit 222 are arranged opposite to each other, and the isolation layer 212 has connection holes 2121 corresponding to the electrode unit 221 and the pressure sensing unit 222. The connection holes 2121 are used for contact between the electrode unit 221 and the pressure sensing unit 222.

[0045] Specifically, the cross section of the connection hole 2121 can be circular, quasi-circular, square, rectangular, polygonal or other irregular shapes. For example, Figure 4 The cross-section of the connection hole 2121 is circular, and the sensitivity of the resistive pressure sensor 22 can be adjusted by changing the diameter of the connection hole 2121. Specifically, one electrode unit 221 can cover multiple connection holes 2121. That is, the contact area between the electrode unit 221 and the pressure sensing unit 222 can be adjusted by adjusting the diameter of each connection hole 2121, thereby achieving the effect of adjusting the sensitivity of the resistive pressure sensor 22.

[0046] like Figure 4As shown, the rubber barrier layer 212 is provided with an air guide groove 2122 that communicates with the connection hole 2121. The connection hole 2121 is connected to the outside world through the air guide groove 2122. The air guide groove 2122 serves to conduct the gas within the connection hole 2121 with the outside air, thereby preventing the resistive pressure sensor 22 from sensing errors caused by the sealing of the connection hole 2121. This ensures the operational repeatability and stability of the resistive pressure sensor 22.

[0047] like Figure 2 、 Figure 5 and 6 As shown, in one embodiment, the second substrate 213 has a third mounting surface 2132 disposed opposite the second mounting surface 2131. The electromagnetic induction sensor 23 includes a sensing unit 231 disposed on the third mounting surface 2132. The sensing unit 231 can be prepared by first coating or printing an induction coil 2311 on the third mounting surface 2132, and then coating or printing a carbon paste block 2312. In other words, the induction coil 2311 can be considered to be located between the carbon paste block 2312 and the second substrate 213.

[0048] It is understandable that, in order to improve the sensitivity and accuracy of the sensing film 2 , a plurality of electromagnetic induction sensors 23 may be mounted on the substrate 21 in an array; or one electromagnetic induction sensor 23 may include a plurality of sensing units 231 and shielding units 232 in an array.

[0049] like Figure 5 and Figure 7 As shown, in one embodiment, the projections of the resistive pressure sensor 22 and the electromagnetic induction sensor 23 on the second mounting surface 2131 are staggered. The staggered arrangement can ensure the performance of the resistive pressure sensor 22 and the electromagnetic induction sensor 23 while minimizing the mutual influence between the resistive pressure sensor 22 and the electromagnetic induction sensor 23. For example, Figure 5 As shown, the pressure sensing units 222 of the resistive pressure sensor 22 and the shielding units 232 of the electromagnetic induction sensor 23 are alternately distributed on the second mounting surface 2131 .

[0050] like Figure 5 and 7As shown, specifically, the electromagnetic induction sensor 23 includes a shielding unit 232 arranged on the second mounting surface 2131. The projections of the resistive pressure sensor 22 and the electromagnetic induction sensor 23 on the second mounting surface 2131 are interlaced with each other. Specifically, the projections can be divided into a plurality of strip-shaped areas distributed at intervals, and each strip-shaped area has the sensing units 231 of the resistive pressure sensor 22 and the electromagnetic induction sensor 23 distributed in an array. The area between adjacent strip-shaped areas can be considered as a wire area, that is, the wire area is used to arrange the wires connecting the sensing units 231 of each resistive pressure sensor 22 and the electromagnetic induction sensor 23. The projection of the shielding unit 232 of the electromagnetic induction sensor 23 on the second mounting surface 2131 coincides with the wire area. The shielding unit 232 can suppress the interference of external electromagnetic wave signals and electromagnetic wave signals generated by the wires on the electromagnetic induction sensor 23, thereby improving the working stability of the electromagnetic induction sensor 23. It can be understood that since the electrode unit 221 and the pressure sensing unit 222 are arranged relative to each other, Figure 7 The projections of the electrode unit 221 and the pressure sensing unit 222 of the resistive pressure sensor 22 on the second mounting surface 2131 overlap with each other.

[0051] In a specific embodiment, the electrode unit 221 and the pressure-sensing unit 222 of the resistive pressure sensor 22, as well as the sensing unit 231 and the shielding unit 232 of the electromagnetic induction sensor 23, can be formed on the corresponding surface of the substrate 21 by screen printing using conductive ink. Specifically, the conductive ink is one or more of conductive silver paste, conductive copper paste, conductive nickel paste, conductive aluminum paste, conductive graphene paste, and conductive carbon paste. The above conductive inks can be purchased directly on the market or can be customized. For example, the electrode unit 221 of the resistive pressure sensor 22 and the induction coil 2311 of the electromagnetic induction sensor 23 are both made by screen printing using conductive silver paste; the pressure-sensing unit 222 of the resistive pressure sensor 22 and the shielding unit 232 and the carbon paste block 2312 of the electromagnetic induction sensor 23 are both made by screen printing using conductive carbon paste.

[0052] The inductive film 2 and the smart floor of the present invention are not only applicable to scenes such as nursing homes, commercial centers, and unmanned supermarkets, but can also be applied to areas where it is impossible or prohibited to install cameras or video surveillance. In summary, the inductive film and the smart floor of the present invention, by combining resistive pressure sensors and electromagnetic induction sensors, can effectively improve the monitoring accuracy and sensitivity of the smart floor to the standing posture, walking status, and movement trajectory of the monitored person, and have the advantages of multi-dimensional sensing, high accuracy, and good stability. In addition, the manufacturing process of the resistive pressure sensor and the electromagnetic induction sensor in the present invention can adopt a printed electronic additive manufacturing process, so that large-area, high-speed, low-cost mass production can be achieved, and it has significant advantages such as diversified substrates, simple process, and green environmental protection.

[0053] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A sensing film, applied to smart ground, characterized in that: The sensing film includes a substrate and a resistive pressure sensor and an electromagnetic induction sensor formed on the substrate, wherein the resistive pressure sensor is used to sense the pressure applied to the sensing film, and the electromagnetic induction sensor is used to sense the bioelectric field acting on the sensing film; The substrate comprises a first base, an isolation layer, and a second base stacked in sequence; a first mounting surface of the first base is connected to the isolation layer, and a second mounting surface of the second base is connected to the isolation layer; The resistive pressure sensor includes an electrode unit provided on the first mounting surface and a pressure sensing unit provided on the second mounting surface. Under the action of an external force, the electrode unit and the pressure sensing unit can contact each other to generate an electrical signal. The electromagnetic induction sensor includes an induction unit, which adopts a single-layer electrode structure. The induction unit includes an induction coil and a carbon paste block covering the induction coil.

2. The sensing film according to claim 1, wherein: The electrode unit and the pressure sensing unit are arranged opposite to each other. The insulating layer has connection holes corresponding to the electrode unit and the pressure sensing unit. The connection holes are used for contact between the electrode unit and the pressure sensing unit.

3. The sensing film according to claim 2, wherein: An air guide groove connected to the connection hole is provided on the rubber isolation layer, and the connection hole is connected to the outside through the air guide groove.

4. The sensing film according to claim 1, wherein: The electrode unit is an interdigitated electrode structure.

5. The sensing film according to claim 1, wherein: The second substrate has a third mounting surface disposed opposite to the second mounting surface, and the induction unit of the electromagnetic induction sensor is disposed on the third mounting surface.

6. The sensing film according to claim 5, wherein: The electromagnetic induction sensor includes a shielding unit arranged on the second mounting surface.

7. The sensing film according to claim 1, wherein: The projections of the resistive pressure sensor and the electromagnetic induction sensor on the second mounting surface are intertwined.

8. A smart ground, characterized in that: include: ground body; The sensing film according to any one of claims 1 to 7, laid on the ground body; The protective layer is laid on the sensing film.

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