Piezoresistive layer and smart mat

Abstract

This disclosure provides a pressure-sensitive layer and a smart pad, relating to the field of smart pad technology. The pressure-sensitive layer includes: a first electrode layer, a second electrode layer, a pressure-sensitive layer, and a first adhesive layer. The first electrode layer includes a first base layer and a plurality of first conductive lines, which extend along a first direction and are spaced apart along a second direction. The second electrode layer includes a second base layer and a plurality of second conductive lines, which extend along a second direction and are spaced apart along the first direction. The plurality of first conductive lines and the plurality of second conductive lines are located between the first base layer and the second base layer. The pressure-sensitive layer is located between the first electrode layer and the second electrode layer, and includes a plurality of pressure-sensitive strips extending along the first direction and spaced apart along the second direction. The first adhesive layer includes a plurality of adhesive strips, and each pressure-sensitive strip is bonded to both sides in the second direction with adhesive strips, and each pressure-sensitive strip is bonded to the first electrode layer and the second electrode layer through the adhesive strips on both sides, thereby improving the formation of wrinkles in the pressure-sensitive layer.

Description

Technical Field

[0001] This disclosure relates to the field of smart pad technology, and more specifically, to a pressure-sensitive layer and a smart pad. Background Technology

[0002] As people's living standards continue to improve, more and more people are paying attention to physical exercise, such as using fitness mats (yoga mats, dance mats) for exercise. However, due to insufficient mastery of the relevant movements, it is easy for practitioners to perform the movements incorrectly or even make mistakes. This can cause muscle or bone injuries in mild cases, and serious illnesses in severe cases. For example, due to high work intensity and high pressure, people are paying more and more attention to sleep quality. When resting and sleeping on a mattress, it is necessary to understand one's own sleep quality.

[0003] To guide users in performing the correct movements when using a smart fitness mat, the pressure points on the mat can be located. These locations can then be compared with reference points to help users determine the accuracy of their current position. Alternatively, to sense the position of the human body on a mattress, the pressure points on a smart sensor mattress can be located. These locations can then be analyzed to understand the user's sleep patterns. The pressure-sensitive layer is an essential component for the smart mat to achieve its positioning function.

[0004] However, existing pressure-sensitive layers tend to wrinkle during manufacturing, which affects the performance of the smart pad.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this disclosure is to provide a pressure-sensitive layer and a smart pad that improves the formation of wrinkles.

[0007] According to one aspect of this disclosure, a pressure transformer sensing layer is provided, the pressure transformer sensing layer comprising:

[0008] A first electrode layer, comprising a first base layer and a plurality of first wires located on the first base layer, wherein the plurality of first wires extend along a first direction and are spaced apart along a second direction, the first direction intersecting the second direction;

[0009] The second electrode layer includes a second base layer and a plurality of second wires located on the second base layer. The plurality of second wires extend along a second direction and are spaced apart along a first direction. The plurality of first wires and the plurality of second wires are located between the first base layer and the second base layer.

[0010] A pressure-sensitive layer is located between the first electrode layer and the second electrode layer. The pressure-sensitive layer includes a plurality of pressure-sensitive strips extending along the first direction and spaced apart along the second direction. The plurality of pressure-sensitive strips are arranged in a one-to-one correspondence with the plurality of first wires.

[0011] The first adhesive layer includes a plurality of adhesive strips, each pressure-sensitive strip having adhesive strips bonded to both sides in the second direction, and each pressure-sensitive strip being bonded to the first electrode layer and the second electrode layer through the adhesive strips on both sides.

[0012] In one exemplary embodiment of this disclosure, the first adhesive layer is a hot melt adhesive film.

[0013] In one exemplary embodiment of this disclosure, the pressure transformer sensing layer further includes:

[0014] The second adhesive layer is used to bond the first conductor to the first base layer.

[0015] In one exemplary embodiment of this disclosure, the pressure transformer sensing layer further includes:

[0016] The third adhesive layer is used to bond the second conductor to the second base layer.

[0017] In an exemplary embodiment of this disclosure, in the thickness direction of the pressure-sensitive layer, the orthographic projection of the pressure-sensitive strip has a connection area on both sides along the second direction that extends beyond the orthographic projection of the corresponding first conductor, and the portion of the adhesive strip connected to the pressure-sensitive strip is located within the connection area.

[0018] In one exemplary embodiment of this disclosure, the width of the connecting region in the second direction is 5mm to 8mm.

[0019] In one exemplary embodiment of this disclosure, in the second direction, the width of the overlapping portion of the pressure-sensitive strip and the adhesive strips on both sides is less than or equal to 5 mm.

[0020] In one exemplary embodiment of this disclosure, in the first direction, the pressure-sensitive strip has the same length as the adhesive strips on both sides.

[0021] In one exemplary embodiment of this disclosure, there is a gap between two adjacent adhesive strips in the second direction.

[0022] In one exemplary embodiment of this disclosure, the adhesive strip is bonded to the side of the pressure-sensitive strip opposite to the first electrode layer.

[0023] According to another aspect of this disclosure, a smart pad is provided, the smart pad comprising:

[0024] A first surface layer and a second surface layer are disposed opposite to each other;

[0025] The aforementioned pressure-sensitive layer is located between the first surface layer and the second surface layer.

[0026] In one exemplary embodiment of this disclosure, the thickness of the first surface layer and the second surface layer is less than or equal to 1.5 mm, and the thickness of the pressure transducer layer is less than or equal to 0.5 mm.

[0027] The pressure-sensitive layer disclosed herein has each pressure-sensitive strip bonded to the first electrode layer and the second electrode layer via adhesive strips on both sides. The first electrode layer and the second electrode layer are bonded only in the direction of gravity, that is, only vertical pressure is applied, which avoids lateral pulling on the non-woven fiber layer. The base material can maintain a natural and flat state, thereby preventing the generation of wavy wrinkles and improving the appearance quality and overall stability of the product.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0030] Figure 1 This is a schematic diagram of a smart pad provided for one embodiment of the present disclosure.

[0031] Figure 2 An exploded view of a smart pad provided for one embodiment of this disclosure.

[0032] Figure 3 This is a schematic diagram of a pressure transformer induction layer provided in one embodiment of the present disclosure.

[0033] Figure 4An exploded view of a pressure transformer induction layer provided in one embodiment of this disclosure.

[0034] Figure 5 This is a schematic diagram of a first adhesive layer disposed in a pressure transformer induction layer according to an embodiment of the present disclosure.

[0035] Figure 6 This is a schematic diagram showing adhesive strips on both sides of a pressure-sensitive strip according to an embodiment of the present disclosure.

[0036] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Smart mat;

[0039] 110. First surface layer; 120. Second surface layer; 131. Upper shell; 132. Lower shell; 140. Circuit board; 150. Indicator light; 160. Battery; 170. Switch;

[0040] 200, Pressure-sensitive layer; 210, First electrode layer; 211, First base layer; 212, First conductor; 220, Second electrode layer; 221, Second base layer; 222, Second conductor; 230, Pressure-sensitive layer; 231, Pressure-sensitive strip; 240, First adhesive layer; 241, Adhesive strip. Detailed Implementation

[0041] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0042] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0043] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0044] Embodiments of this disclosure provide a smart pad 10, such as Figures 1-4 As shown, the smart pad 10 includes a first surface layer 110, a second surface layer 120, and a pressure sensing layer 200. The second surface layer 120 and the first surface layer 110 are disposed opposite each other along the thickness direction Z of the smart pad 10. The pressure sensing layer 200 is located between the first surface layer 110 and the second surface layer 120, and the first surface layer 110 and the second surface layer 120 form a protection for the pressure sensing layer 200. Along the thickness direction Z of the pressure sensing layer 200, the pressure sensing layer 200 includes a first electrode layer 210, a pressure-sensitive layer 230, and a second electrode layer 220 stacked sequentially. The first electrode layer 210 includes multiple first conductive lines 212, and the second electrode layer 220 includes multiple second conductive lines 222. The pressure-sensitive layer 230 can change its resistance under external force, thereby changing the resistance between the first conductive lines 212 and the second conductive lines 222 at the pressure location.

[0045] In one embodiment, the smart pad 10 further includes a detection circuit, which may include a circuit board 140, a first flexible circuit board, and a second flexible circuit board. The first flexible circuit board is located on the side of the first electrode layer 210, and the conductive ends of multiple first wires 212 are connected to the first flexible circuit board. The second flexible circuit board is located on the side of the second electrode layer 220, and the conductive ends of multiple second wires 222 are connected to the second flexible circuit board. Thus, the first flexible circuit board and the second flexible circuit board can obtain the information of the first wires 212 and the second wires 222 whose resistance changes. The first flexible circuit board and the second flexible circuit board are connected to the circuit board 140. The circuit board 140 obtains the information of the first wires 212 and the second wires 222 whose resistance changes through the first flexible circuit board and the second flexible circuit board, and then outputs the coordinate information of the pressure applied to the smart pad 10 according to the position of the first wires 212 and the second wires 222.

[0046] The first surface layer 110 and the second surface layer 120 of the smart pad 10 can be made of TPU material. The edges of the first surface layer 110 and the second surface layer 120 are sealed together to form a sealed cavity between them. The edges of the first surface layer 110 and the second surface layer 120 can be sealed together by means of adhesive bonding, sewing, weaving, etc., and this disclosure does not impose any limitations on this. The first electrode layer 210 and the first surface layer 110 can be connected by means of adhesive bonding, sewing, etc., and the second electrode layer 220 and the second surface layer 120 can be connected by means of adhesive bonding, sewing, etc.

[0047] The pressure-sensitive layer 200 is located between the first surface layer 110 and the second surface layer 120. The first electrode layer 210 is fixedly connected to the first surface layer 110, and the second electrode layer 220 is fixedly connected to the second surface layer 120. The materials used for the first surface layer 110 and the second surface layer 120 have good deformation and self-recovery capabilities, so that they can generate elastic deformation when an external force is applied and can return to their original shape after the external force is removed. This allows the first electrode layer 210 and the second electrode layer 220 to return to their original shape after the external force is removed, thereby restoring the pressure of the first electrode layer 210 and the second electrode layer 220 on the pressure-sensitive layer 230.

[0048] The smart pad 10 may also include insulating layers. An insulating layer exists between the first electrode layer 210 and the first surface layer 110, and an insulating layer exists between the second electrode layer 220 and the second surface layer 120. The insulating layers provide insulation for the smart pad 10, preventing electric shock to the user due to leakage from the voltage transformer sensing layer 200. Alternatively, both the first surface layer 110 and the second surface layer 120 may be directly supported by insulating material to achieve the same insulation performance.

[0049] In one embodiment, such as Figure 2 As shown, the smart pad 10 also includes a housing, which is formed by fastening an upper shell 131 and a lower shell 132 together. The upper shell 131 and the lower shell 132 fasten together to form an accommodating space, in which a circuit board 140 is accommodated. The housing provides protection for the circuit board 140.

[0050] The smart pad 10 also includes a switch 170, which can be used to turn the smart pad 10 on or off. The control key of the switch 170 is located outside the housing, while the main body of the switch 170 is located inside the housing.

[0051] The housing also houses a battery 160, which powers the entire detection circuit. The battery 160 can be a removable secondary battery for easy replacement and charging; alternatively, it can be a non-removable secondary battery that is charged via a charging interface.

[0052] The housing has a light-transmitting area, and the circuit board 140 has an indicator light 150, whose light signal can be observed through the housing. The light signal can be the battery level signal of the battery 160, the signal indicating whether the circuit board 140 is working properly, etc., and this disclosure does not limit it.

[0053] The voltage transformer induction layer 200 provided in this disclosure will now be described in detail.

[0054] Figures 2-5 As shown, the pressure-sensitive layer 200 includes a first electrode layer 210, a pressure-sensitive layer 230, and a second electrode layer 220 stacked sequentially along the thickness direction Z. The first electrode layer 210 includes a first base layer 211 and a plurality of first conductors 212 extending along the first direction X and spaced apart along the second direction Y on the first base layer 211. The second electrode layer 220 includes a second base layer 221 and a plurality of second conductors 222 extending along the second direction Y and spaced apart along the first direction X on the second base layer 221. The pressure-sensitive layer 230 includes a plurality of pressure-sensitive strips 231 extending along the first direction X and spaced apart along the second direction Y, with each pressure-sensitive strip 231 corresponding to one of the plurality of first conductors 212.

[0055] By configuring multiple pressure-sensitive strips 231 to correspond one-to-one with multiple second wires 222, when the second wire 222 corresponding to the pressure position of the smart mat 10 is subjected to pressure, the pressure exerted on the corresponding pressure-sensitive strip 231 below it by the first wire 212 and the second wire 222 increases. The resistance of the pressure-sensitive strip 231 will change significantly after being compressed, thereby changing the resistance between the first wire 212 and the second wire 222. For example, under a fixed voltage, the current change between the first wire 212 and the second wire 222 at this position can be detected by the detection circuit to determine the position of the wire with the current change, thereby determining the pressure position of the smart mat 10 and feeding the pressure position back to the user for reference, thereby identifying the human stepping position and assisting in judging whether the exercise movement is standard.

[0056] The pressure-sensitive layer 230 can be made of conductive carbon film, i.e., multiple pressure-sensitive strips 231 are strip-shaped carbon films. The resistance of these strip-shaped carbon films changes significantly under pressure, thus altering the resistance between the corresponding first wire 212 and second wire 222 when compressed. The conductive carbon film is relatively thin, so its use in the smart pad 10 does not affect the overall thickness of the smart pad 10, nor does it create noticeable bumps, improving the user experience. The pressure-sensitive layer 230 can also be made of a material that can deform and whose resistance changes; this disclosure does not limit its use. It is understood that, in addition to being formed from the aforementioned conductive carbon film, the pressure-sensitive layer 230 can also be formed from materials such as single-crystal silicon and graphene, whose resistance changes after compression.

[0057] In some embodiments, such as Figure 6 and Figure 7 As shown, the pressure-sensitive layer 230 is provided with a first adhesive layer 240, which includes a plurality of adhesive strips 241. Each pressure-sensitive strip 231 is bonded to both sides of the second direction Y with adhesive strips 241, and each pressure-sensitive strip 231 is bonded to the first electrode layer 210 and the second electrode layer 220 through the adhesive strips 241 on both sides.

[0058] In the traditional manufacturing process of the pressure-sensitive layer 200, the traditional sewing process applies lateral tensile force to the nonwoven fabric fiber layer due to puncture and thread tension, resulting in wavy wrinkles on both sides of the fabric. This not only affects the product's appearance but may also reduce the service life of the pressure-sensitive layer 200 and even affect the sensing accuracy due to stress concentration at the wrinkles. In this disclosure, each pressure-sensitive strip 231 is bonded to the first electrode layer 210 and the second electrode layer 220 through adhesive strips 241 on both sides. The first electrode layer 210 and the second electrode layer 220 are bonded only in the direction of gravity, that is, only vertical pressure is applied, avoiding lateral tensile force on the nonwoven fabric fiber layer. The base material can maintain a natural and flat state, thereby preventing the generation of wavy wrinkles and improving the product's appearance quality and overall stability.

[0059] In some embodiments, the voltage transformer sensing layer 200 further includes a second adhesive layer, through which the first conductor 212 is bonded to the first base layer 211. For example, the second adhesive layer may be double-sided adhesive, through which the first conductor 212 is bonded to the first base layer 211.

[0060] The second adhesive layer can be a strip structure matching the shape of the first conductor 212 (such as a strip adhesive layer along the extension direction of the first conductor 212), tightly adhering to the surface of the first base layer 211 to ensure the straightness and uniformity of the spacing of the first conductor 212 along the first direction X. Even if the base material is slightly stretched due to stress, the first conductor 212 can maintain its initial position under the constraint of the second adhesive layer, avoiding positioning errors caused by spacing deviations. At the same time, the first conductor 212 (e.g., aluminum foil, copper foil, silver paste wire, or conductive fiber wire) will be repeatedly bent due to the deformation of the first base layer 211 during long-term use, and is prone to breakage if not firmly fixed; the second adhesive layer tightly bonds the first conductor 212 to the first base layer 211, dispersing the bending stress on the first conductor 212, reducing the risk of breakage due to bending fatigue, and extending the service life of the first conductor 212.

[0061] In some embodiments, the voltage transformer sensing layer 200 further includes a third adhesive layer, through which the second conductor 222 is bonded to the second base layer 221. For example, the third adhesive layer may be double-sided adhesive, through which the second conductor 222 is bonded to the second base layer 221.

[0062] The third adhesive layer can be a strip structure matching the shape of the second conductor 222 (such as a strip adhesive layer extending along the direction of the first conductor 212), tightly adhering to the surface of the second base layer 221 to ensure the straightness and uniformity of the spacing of the second conductor 222 along the first direction X. Even if the base material is slightly stretched due to stress, the second conductor 222 can maintain its initial position under the constraint of the second adhesive layer, avoiding positioning errors caused by spacing deviations. At the same time, the second conductor 222 (e.g., aluminum foil, copper foil, silver paste wire, or conductive fiber wire) will be repeatedly bent due to the deformation of the second base layer 221 during long-term use, and is prone to breakage if not firmly fixed; the third adhesive layer tightly bonds the second conductor 222 to the second base layer 221, dispersing the bending stress on the second conductor 222, reducing the risk of breakage due to bending fatigue, and extending the service life of the second conductor 222.

[0063] In some embodiments, the first adhesive layer 240 may be a TPU-type hot melt adhesive film. A hot melt adhesive film is a material that achieves adhesion by melting upon heating. After melting, the hot melt adhesive film can fully fuse with the adhered materials (such as the first base layer 211, the second base layer 221, and the surface of the pressure-sensitive strip 231), resulting in an adhesive strength far exceeding the mechanical interlocking of stitching. This strength can withstand slight deformation and stretching of the base material during long-term use, preventing interlayer separation. Simultaneously, the adhesive strength of the hot melt adhesive film is less affected by ambient temperature and humidity, meeting the usage requirements of the smart pad 10 under different temperature conditions. During the melting and bonding process, air can be expelled by pressurization, achieving bubble-free bonding and ensuring 100% adhesion between the adhesive strip 241 and the adhered surface, eliminating the risk of localized delamination.

[0064] The hot melt adhesive film can be pre-die-cut into a shape and size matching the adhesive strip 241. The hot melt adhesive film and pressure-sensitive strip 231 can be pre-processed into a single unit using a machine. Release paper is placed on one side of the pre-processed hot melt adhesive film and pressure-sensitive layer 230 to facilitate subsequent processing. The back of the first conductor 212 has double-sided adhesive, which is then attached to the first base layer 211 to form the first electrode layer 210. The back of the second conductor 222 also has double-sided adhesive, which is then attached to the second base layer 221 to form the second electrode layer 220. Adhesion position limiting lines can be provided on the first base layer 211. The pre-processed hot melt adhesive film and pressure-sensitive layer 230 are then attached to the first base layer 211 along the limiting lines. The release paper on the back is then removed, and the second electrode layer 220 is attached diagonally downwards. Next, the entire pressure-sensitive layer 200 is hot-pressed, with the hot-pressing temperature controlled at around 110 degrees Celsius and the hot-pressing time kept not exceeding 10 seconds. This firmly fixes the first base layer 211, pressure-sensitive strip 231, and second base layer 221 together, while maintaining flexibility and curability after fixing. This process is simple to operate, reduces manual labor, and allows for better dimensional control during processing, thus improving the product yield.

[0065] Because hot melt adhesive film is flexible and stretchable, it can fully wet the surface of the adhered object after hot pressing and melting, filling tiny gaps and forming good intermolecular forces. Furthermore, it exhibits almost no shrinkage or deformation after curing, ensuring the surface smoothness of the sensing layer and consequently guaranteeing the smoothness of the finished product. In addition, the hot melt adhesive film can adaptively expand and contract with slight deformations of the upper and lower substrates, reducing material fatigue wear during long-term use and extending the service life of the pressure transducer layer 200.

[0066] In some embodiments, along the thickness direction Z of the pressure-sensitive layer 200, the orthographic projection of the pressure-sensitive strip 231 has connection areas on both sides extending beyond the orthographic projection of the corresponding first conductor 212 along the second direction Y. The portion of the adhesive strip 241 connected to the pressure-sensitive strip 231 is located within these connection areas. By providing connection areas extending beyond the first conductor 212 on the pressure-sensitive strip 231, the adhesive strip 241, after being connected to the pressure-sensitive strip 231, will not overlap with the first conductor 212. The adhesive strip 241 only covers the connection area of ​​the pressure-sensitive strip 231, leaving the core sensing area (middle part) of the pressure-sensitive strip 231 completely exposed. This allows the pressure-sensitive strip 231 to deform sufficiently and accurately sense pressure changes. Simultaneously, the pressure-sensitive strip 231 does not have a portion located between the first conductor 212, the pressure-sensitive strip 231, and the second conductor 222. Therefore, the adhesive strip 241 does not affect the resistance between the first conductor 212 and the second conductor 222, ensuring the sensitivity of the pressure-sensitive layer 200.

[0067] In the second direction Y, the width of the connecting area is 5mm to 8mm, such as 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc., which will not be listed here in this disclosure.

[0068] In the second direction Y, the width of the overlap between the pressure-sensitive strip 231 and the adhesive strips 241 on both sides is less than or equal to 5 mm. Limiting the overlap width to less than or equal to 5 mm ensures that the adhesive strip 241 only covers the edge area of ​​the pressure-sensitive strip 231, while the middle part is completely exposed.

[0069] In the first direction X, the pressure-sensitive strip 231 is the same length as or slightly shorter than the adhesive strips 241 on both sides, so as to ensure that the adhesive strip 241 extends from one end of the pressure-sensitive strip 231 to the other end, achieving full-length coverage and fixation. This ensures that each position of the pressure-sensitive strip 231 in the first direction X is subject to uniform constraint force, avoiding local loosening or displacement, and ensuring full adhesion between the pressure-sensitive strip 231 and the electrode layer.

[0070] In the second direction Y, there is a gap between two adjacent adhesive strips 241. The non-woven fabric and other base materials have a certain degree of elasticity and can stretch and contract with human movement. Continuous adhesive strips 241 restrict this stretching and contraction, causing the pressure sensing layer 200 to fail to conform to the dynamic changes of the human body, affecting the real-time performance of pressure sensing. The base material in the gap area is not covered by the adhesive strips 241 and can freely stretch and deform, allowing the pressure sensing layer 200 to maintain its overall softness.

[0071] The adhesive strip 241 can be bonded to the side of the pressure-sensitive strip 231 away from the first electrode layer 210. Since the adhesive strip 241 is parallel to the extending direction of the first conductor 212, it can form a continuous bond with the first base layer 211; however, the adhesive strip 241 intersects the extending direction of the second conductor 222, thus the adhesive strip 241 is intermittently bonded to the second base layer 221. By bonding the adhesive strip 241 to the side of the pressure-sensitive strip 231 away from the first electrode layer 210, i.e., by placing the adhesive strip 241 close to the second base layer 221, the bonding strength between the adhesive strip 241 and the second base layer 221 can be relatively improved. Of course, the adhesive strip 241 can be bonded to the side of the pressure-sensitive strip 231 away from the second electrode layer 220, or adhesive strips 241 can be provided on both sides of the pressure-sensitive strip 231; this disclosure does not impose any limitations on this.

[0072] In some embodiments, the first base layer 211 and the second base layer 221 may be made of the same material. Using the same material for the first base layer 211 and the second base layer 221 makes it easier to achieve a good fusion effect with the hot melt adhesive film during hot pressing, thus improving the bonding quality.

[0073] The first base layer 211 is made of non-woven fabric, and / or the second base layer 221 is made of non-woven fabric, which facilitates good fusion with the hot melt adhesive film.

[0074] The multiple first wires 212 in the first electrode layer 210 and the multiple second wires 222 in the second electrode layer 220 can be conductive printed circuits made of metal foil or thin film.

[0075] In some embodiments, in the second direction Y, the ratio of the width of the first conductor 212 to the width of the corresponding pressure-sensitive strip 231 is a, and 0.9≤a<1, for example, 0.90, 0.92, 0.95, 0.97, 0.99, etc., that is, the width of the pressure-sensitive strip 231 is slightly larger than the width of the first conductor 212, ensuring that the subsequent pressure-sensitive strip 231 can completely cover the first conductor 212.

[0076] In some embodiments, in the first direction X, the ratio of the length of the first conductor 212 to the length of the corresponding pressure-sensitive strip 231 is b, where 0.9 ≤ b ≤ 1.1, and b is, for example, 0.9, 0.95, 1.0, 1.05, 1.1, etc. By making the length of the first conductor 212 comparable to the length of the corresponding pressure-sensitive strip 231, a greater overlap in the length direction can be achieved between the first conductor 212 and the pressure-sensitive strip 231 located in the same accommodating space, enabling pressure positioning of more areas and improving the detection range and detection accuracy.

[0077] In some embodiments, the thicknesses of the first surface layer 110 and the second surface layer 120 are each less than or equal to 1.5 mm, and the thickness of the pressure-sensitive layer 200 is less than or equal to 0.5 mm, that is, the thickness of the smart pad 10 does not exceed 3.5 mm.

[0078] The first surface layer 110 and the second surface layer 120 can be made of elastic materials such as TPE (thermoplastic elastomer), PU (polyurethane), and rubber. Since the surface layer material of the smart pad 10 is typically TPE, which is expensive and prone to wear and tear and decreased cushioning after long-term use, the cost of using the smart pad 10 is high for users. This disclosure, by ensuring that the thickness of the smart pad 10 does not exceed 3.5mm, allows the smart pad 10 to be placed under a regular TPE pad. After long-term use, only the surface layer of the regular TPE pad needs to be replaced, thereby extending the lifespan of the smart pad 10 and reducing user costs.

[0079] It should be noted that the smart mat 10 provided in this disclosure can be a yoga mat, dance mat, etc., serving as a smart fitness mat for users to exercise. When users exercise on the smart fitness mat, their movement accuracy can be determined by locating the pressure points on the mat, and then comparing the located pressure points with reference positions to help users judge the accuracy of their current position. The smart mat provided in this disclosure can also be a smart sensor mattress. When users rest or sleep on the mattress, the smart sensor mattress can locate the pressure points on the mattress, and then analyze the located pressure points to obtain information about the user's sleep patterns.

[0080] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A piezoelectric sensing layer, characterized by, include: A first electrode layer, comprising a first base layer and a plurality of first wires located on the first base layer, wherein the plurality of first wires extend along a first direction and are spaced apart along a second direction, the first direction intersecting the second direction; The second electrode layer includes a second base layer and a plurality of second wires located on the second base layer. The plurality of second wires extend along a second direction and are spaced apart along a first direction. The plurality of first wires and the plurality of second wires are located between the first base layer and the second base layer. A pressure-sensitive layer is located between the first electrode layer and the second electrode layer. The pressure-sensitive layer includes a plurality of pressure-sensitive strips extending along the first direction and spaced apart along the second direction. The plurality of pressure-sensitive strips are arranged in a one-to-one correspondence with the plurality of first wires. The first adhesive layer includes a plurality of adhesive strips, each pressure-sensitive strip having adhesive strips bonded to both sides in the second direction, and each pressure-sensitive strip being bonded to the first electrode layer and the second electrode layer through the adhesive strips on both sides.

2. The pressure transducer layer according to claim 1, characterized in that, The first adhesive layer is a hot melt adhesive film.

3. The piezoelectric sensing layer of claim 1, wherein, The pressure-sensitive layer further includes: The second adhesive layer is used to bond the first conductor to the first base layer.

4. The piezoelectric sensing layer according to claim 1 or 3, characterized in that, The pressure-sensitive layer further includes: The third adhesive layer is used to bond the second conductor to the second base layer.

5. The piezoelectric sensing layer of claim 1, wherein, In the thickness direction of the pressure-sensitive layer, the orthographic projection of the pressure-sensitive strip has a connection area on both sides along the second direction that exceeds the orthographic projection of the corresponding first conductor, and the part of the adhesive strip connected to the pressure-sensitive strip is located in the connection area.

6. The piezoelectric sensing layer of claim 5, wherein, In the second direction, the width of the connecting area is 5mm to 8mm.

7. The piezoelectric sensing layer of claim 6, wherein, In the second direction, the width of the overlapping portion of the pressure-sensitive strip and the adhesive strips on both sides is less than or equal to 5 mm.

8. The pressure transducer layer according to claim 1, characterized in that, In the first direction, the pressure-sensitive strip has the same length as the adhesive strips on both sides.

9. The pressure transducer layer according to claim 1, characterized in that, In the second direction, there is a gap between two adjacent adhesive strips.

10. The pressure transducer layer according to claim 1, characterized in that, The adhesive strip is bonded to the side of the pressure-sensitive strip that is away from the first electrode layer.

11. A smart cushion, characterized in that include: A first surface layer and a second surface layer are disposed opposite to each other; The pressure transducer layer according to any one of claims 1 to 10, wherein the pressure transducer layer is located between the first surface layer and the second surface layer.

12. The smart mat of claim 11, wherein, The thickness of the first surface layer and the second surface layer is less than or equal to 1.5 mm, and the thickness of the pressure transducer layer is less than or equal to 0.5 mm.

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