Electronic tag for detecting humidity

Abstract

The invention relates to the technical field of RFID, and particularly provides an electronic tag for detecting humidity. The electronic tag for detecting humidity comprises a chip, an antenna and two detection strips, the two detection strips and the antenna are electrically connected with the chip, and the two detection strips are used for being in contact with liquid; a capacitance detection module is arranged in the chip and is used for measuring the humidity according to the capacitance change between the two detection strips. According to the invention, the detection problem of the baby diaper is solved by using the passive RFID, and the detection problem can be HF or UHF. The temperature of the diaper is tested by using two symmetrical and equal conductive aluminum foils (any conductive material can be used). And conduction is carried out by using a conductive adhesive process or a dotting mode. The humidity sensor is obtained with low cost in a vacuum plating mode. The change value of the capacitance and the actual condition of the baby diaper are subjected to benchmarking setting, and a replacement threshold value is obtained. Therefore, the humidity in the baby diaper can be detected in time, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the field of RFID technology, and in particular to an electronic tag for detecting humidity. Background Art

[0002] RFID (Radio Frequency Identification) is short for radio frequency identification technology. The radio signal it forms transmits data from a tag attached to an object through an electromagnetic field tuned to a radio frequency to automatically identify and track the object. Some tags can obtain energy from the electromagnetic field emitted by the identifier during identification, and do not require batteries. The tag contains electronically stored information and can be identified within a few meters. Unlike barcodes, radio frequency tags do not need to be within the line of sight of the identifier and can also be embedded in the tracked object. RFID can be classified into three types according to whether it is active or not: active, passive and semi-active. Among them, passive RFID requires external excitation to generate electricity and send data through the antenna. At present, the situation of wet diapers for disabled elderly people or children needs to be manually detected, which is troublesome. Embedding RFID sensing devices requires additional humidity sensors, which have complex structures and high costs. Summary of the invention

[0003] Based on this, it is necessary to provide an electronic tag for detecting humidity to solve at least one of the above technical problems.

[0004] An electronic tag for detecting humidity comprises a chip, an antenna and two detection strips, wherein the two detection strips and the antenna are electrically connected to the chip, and the two detection strips are used to contact liquid; the chip is equipped with a capacitance detection module for measuring humidity according to the capacitance change between the two detection strips.

[0005] In one embodiment, the antenna is a HF antenna or a UHF antenna, comprising a metal coil formed around.

[0006] In one embodiment, the two detection strips are metal strips parallel to each other, and a detection gap is formed between the two metal strips.

[0007] In one embodiment, the two metal strips are in the same rectangular strip shape and have the same width, and the width of the metal strip is greater than the width of the detection gap.

[0008] In one embodiment, the humidity detecting electronic tag is embedded in the diaper, the two metal strips are used to detect the humidity of urine, and the chip calibrates the temperature and liquid level according to different humidity.

[0009] In one embodiment, the metal strip is a conductive aluminum foil, and the two conductive aluminum foils are connected to the antenna by using a conductive adhesive process or a dot-marking method.

[0010] In one embodiment, the two conductive aluminum foils are made by vacuum plating and combined with each other to form a humidity sensor.

[0011] In one embodiment, the humidity detecting electronic tag is a passive RFID electronic tag, which is used to perform a benchmark setting based on the change value of the capacitance and the humidity condition of the diaper to obtain a replacement threshold.

[0012] In one embodiment, the metal coil is in the shape of a rectangular frame as a whole, and its length direction is parallel to the length direction of the conductive aluminum foil, and its length is smaller than the length of the conductive aluminum foil.

[0013] In one embodiment, the metal coil is made of a metal sheet that starts from a starting end and gradually winds inward until a triangular ending end is formed on the inner side; a connecting end adjacent to the starting end is also provided on one side of the metal coil, the starting end and the connecting end are arranged side by side and are respectively electrically connected to the ends of the two conductive aluminum foils, the connecting end is electrically connected to a metal frame wire, the metal frame wire extends around the periphery of the metal coil to an end away from the conductive aluminum foil, a triangular connecting block is provided at the outer side of a corner of a side of the metal coil away from the starting end, the triangular connecting block is integrally formed at the end of the metal frame wire, and is electrically connected to the triangular ending end through a cross-line, and circular holes are provided on the triangular connecting block and the triangular ending end.

[0014] The present invention has the following beneficial effects:

[0015] 1. Use passive RFID to solve the problem of diaper detection, which can be HF or UHF.

[0016] 2. Use two symmetrical and equal conductive aluminum foils to test the temperature of the diaper (any conductive material can be used).

[0017] 3. Use conductive glue technology or dotting method to achieve conduction.

[0018] 4. The humidity sensor is obtained at a low cost by vacuum plating.

[0019] 5. By comparing the change in capacitance with the actual situation of the diaper, the threshold for changing the diaper can be obtained.

[0020] In summary, the present invention can detect the humidity in the diaper in a timely manner and has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 FIG. 4 is a schematic diagram of an electronic tag for detecting humidity according to an embodiment of the present invention.

[0023] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0024] Figure 3 is a schematic diagram of a UHF antenna according to an embodiment.

[0025] Figure 4 FIG. 4 is a schematic diagram of a three-dimensional structure of two detection strips according to an embodiment.

[0026] Figure 5 for Figure 4 A three-dimensional schematic diagram of the two detection bars shown from another perspective.

[0027] Figure 6 FIG. 4 is a cross-sectional schematic diagram of two detection strips according to an embodiment.

[0028] Figure 7 for Figure 6 A partial enlarged view of point B in the middle.

[0029] In the figure:

[0030] Antenna 100 Detection strip (metal strip, conductive aluminum foil) 200

[0031] Metal coil 208 Triangle end 209 Start end 210

[0032] Connection end 213 Metal frame wire 215 Triangular connection block 218

[0033] Round hole 300 Detection gap 205 DETAILED DESCRIPTION

[0034] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0035] See also Figures 1 to 3 The present invention provides an electronic tag for detecting humidity, including a chip, an antenna 100 and two detection strips 200. The two detection strips 200 and the antenna 100 are electrically connected to the chip, and the two detection strips 200 are used to contact liquid; the chip has a built-in capacitance detection module for measuring humidity according to the capacitance change between the two detection strips 200.

[0036] By utilizing the liquid soaking between the two detection strips 200, the capacitance change between the two detection strips 200 can be affected, so that the empirical value can obtain the wetness of the diaper, and then determine whether the diaper needs to be changed, especially for disabled elderly people or children's diapers. For example, in a nursing home where there are a large number of elderly people wearing diapers, the present invention can very conveniently determine who needs to be changed.

[0037] For example, the antenna 100 is a HF antenna or a UHF antenna (such as Figure 3 As shown in the figure, the electronic tag for detecting humidity is embedded in the diaper. For example, it can be embedded in the cotton core of the diaper.

[0038] For example, the two metal strips 200 are used to detect the humidity of urine, and the chip calibrates the temperature and liquid level according to different humidity. The metal strip 200 is a conductive aluminum foil 200, and the two conductive aluminum foils 200 are connected to the antenna 100 by a conductive glue process or a dotting method. The two conductive aluminum foils 200 are made by vacuum plating and combined with each other to form a humidity sensor. The electronic tag for detecting humidity is a passive RFID electronic tag, which is used to perform a benchmark setting according to the change value of the capacitance and the humidity condition of the diaper to obtain a threshold for changing the diaper. The metal coil 208 is in the shape of a rectangular frame as a whole, and its length direction is parallel to the length direction of the conductive aluminum foil 200, and its length is less than the length of the conductive aluminum foil 200.

[0039] For example, see Figure 2 The metal coil 208 is made of a metal sheet, which gradually circles inward from a starting end 210 until a triangular end 209 is formed on the inner side; a connecting end 213 adjacent to the starting end 210 is also provided on one side of the metal coil 208, the starting end 210 and the connecting end 213 are arranged side by side and are electrically connected to the ends of the two conductive aluminum foils 200 respectively, the connecting end 213 is electrically connected to a metal frame wire 215, the metal frame wire 215 extends around the periphery of the metal coil 208 to an end away from the conductive aluminum foil 200, a triangular connecting block 218 is provided on the outer side of a corner of the side of the metal coil 208 away from the starting end 210, the triangular connecting block 218 is integrally formed at the end of the metal frame wire 215, and is electrically connected to the triangular end 209 through a cross-line, and a circular hole 300 is opened on both the triangular connecting block 218 and the triangular end 209.

[0040] The present invention has the following beneficial effects:

[0041] 1. Use passive RFID to solve the problem of diaper detection, which can be HF or UHF.

[0042] 2. Use two symmetrical and equal conductive aluminum foils 200 to test the temperature of the diaper (any conductive material can be used).

[0043] 3. Use conductive glue technology or dotting method to achieve conduction.

[0044] 4. The humidity sensor is obtained at a low cost by vacuum plating.

[0045] 5. Use the change value of the capacitance to compare with the actual situation of the diaper to obtain the replacement threshold. In summary, the present invention can detect the humidity in the diaper in a timely manner and has a simple structure and low cost.

[0046] When in use, by embedding the above-mentioned electronic tags for detecting humidity in multiple diapers, it is possible to read the electronic tags in multiple diapers through a card reader in the room or within a preset time period, so as to determine how many diapers are wet and need to be replaced, thereby eliminating the need for manual inspection and greatly saving time.

[0047] For example, in one embodiment, the antenna 100 is an HF antenna or a UHF antenna, specifically a metal coil 208 formed around. The two detection strips 200 are metal strips 200 parallel to each other, and the metal strips are in the shape of rectangular sheets. A detection gap 205 is formed between the two metal strips 200, which is in the shape of a slit. The two metal strips 200 are the same rectangular strips and have the same width, and the width of the metal strip 200 is greater than the width of the detection gap 205, for example, it can be 5-8 times. The electronic tag for detecting humidity is embedded in the diaper. For example, it can be embedded inside or at the bottom of the cotton core of the diaper.

[0048] The two metal strips 200 are used to detect the humidity of urine, and the chip calibrates the temperature and liquid level according to different humidity. The metal strip 200 is a conductive aluminum foil 200, and the two conductive aluminum foils 200 are connected to the antenna 100 by conductive glue technology or dotting. The two conductive aluminum foils 200 are made by vacuum plating and combined with each other to form a humidity sensor. The electronic tag for detecting humidity is a passive RFID electronic tag, which is used to perform calibration settings according to the change value of the capacitance and the humidity of the diaper to obtain a replacement threshold. The metal coil 208 is in the shape of a rectangular frame as a whole, and its length direction is parallel to the length direction of the conductive aluminum foil 200, and its length is less than the length of the conductive aluminum foil 200. The starting end 210 and the connecting end 213 are located at one end of the metal coil 208.

[0049] Please refer to 4 to Figure 7 In one embodiment, two connecting bridges 31 are provided between the two detection strips 200, and a plurality of adhesive strips 32 are provided on the side of the two detection strips 200 away from each other, which are used to be attached to the diaper. A recessed portion 325 is provided at the bottom of each adhesive strip 32, and each connecting bridge 31 includes a bottom plate 312 and an arched bridge 315 provided on the bottom plate 312. A rectangular notch 313 is formed on the opposite side of the arched bridge 315 of the two connecting bridges 31, and a sliding groove 316 is recessed on the two bottom plates 312. The two sliding grooves 316 are arranged opposite to each other, and the end of each sliding groove 316 passes through the side of the bottom plate 312. Flat-fitting portions 317 are formed at the opposite ends of the arched bridge 315, and screws 318 are provided on the flat-fitting portions 317, which pass through the bottom of the detection strip 200. The side walls of the two detection strips 200 on one side opposite to each other are concavely provided with a strip groove 319, which extends along the straight direction of the detection strip 200, and a step portion 310 is formed in the strip groove 319. The two detection strips 200 are respectively provided with an arch strip 41 on the side away from each other, and the arch strip 41 extends along the length direction of the detection strip 200. By providing two adhesive strips 32, it is convenient to stick the two detection strips 200 to the inside of the diaper.

[0050] For example, in another embodiment, two connecting bridges 31 are provided between the two detection strips 200, and a plurality of adhesive strips 32 are provided on the side of the two detection strips 200 away from each other, which are pasted in a rectangular block shape and are used to be pasted on the diaper. A recessed portion 325 is provided at the bottom of each adhesive strip 32, and the recessed portion 325 is rectangular. Each connecting bridge portion 31 includes a bottom plate 312 and an arched bridge 315 provided on the bottom plate 312, and rectangular notches 313 are formed on the opposite sides of the arched bridges 315 of the two connecting bridge portions 31. Chamfered inclined surfaces 42 are formed at the corners of the detection strip 200. Sliding grooves 316 are recessed on the two bottom plates 312, and the two sliding grooves 316 are arranged opposite to each other, and the end of each sliding groove 316 passes through the side of the bottom plate 312. The opposite ends of the arch bridge 315 are respectively formed with flat parts 317, and screws 318 are arranged on the flat parts 317, and the screws 318 penetrate to the bottom of the detection bar 200. The side walls of the two detection bars 200 on the opposite side are inwardly concavely provided with strip grooves 319, which extend along the straight direction of the detection bar 200, and a step part 310 is formed in the strip groove 319. The two detection bars 200 are respectively provided with arch bars 41 on the side away from each other, and the arch bars 41 extend along the length direction of the detection bar 200. The two detection bars 200 are provided with two avoidance grooves 44 on the side away from each other, and the two avoidance grooves 44 penetrate the upper surface and the lower surface of the detection bar 200 and penetrate the arch bars 41. The arch bars 41 are convexly arranged on the surface of the detection bar 200, and a strip through hole 415 is formed therein. The detection bar 200 is also provided with a plurality of pin holes 418, which are arranged at intervals, and the lower end of each pin hole 418 extends into the strip groove 319. Each detection bar 200 is also provided with a plurality of triangular holes 419, and each triangular hole 419 is respectively provided with a plurality of pin holes 418. By providing a plurality of pin holes 418, it is convenient to position the detection bar 200, and the provision of the triangular holes 419 can save the raw materials of the detection bar 200. The provision of the screws 318 facilitates the fixing of the connecting bridge 31 to the detection bar 200.

[0051] In another embodiment, the two bottom plates 312 are both provided with a sliding groove 316, the two sliding grooves 316 are arranged opposite to each other, and the end of each sliding groove 316 passes through the side of the bottom plate 312. The two opposite ends of the arch bridge 315 are respectively formed with a flat part 317, and a screw 318 is arranged on the flat part 317, and the screw 318 passes through the bottom of the detection bar 200. The side wall of the two detection bars 200 on the opposite side is inwardly provided with a strip groove 319, the strip groove 319 extends along the straight direction of the detection bar 200, and a step part 310 is formed in the strip groove 319. The two detection bars 200 are respectively provided with an arch bar 41 on the side away from each other, and the arch bar 41 extends along the length direction of the detection bar 200. The two detection bars 200 are both provided with two avoidance grooves 44 on the side away from each other, and the two avoidance grooves 44 pass through the upper surface and the lower surface of the detection bar 200 and pass through the arch bar 41. The arched strip 41 is convexly disposed on the surface of the detection strip 200. By providing the arched portion 41, the detection strip 200 can better fit the shape of the diaper, thereby increasing the bonding strength.

[0052] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An electronic tag for detecting humidity, characterized in that: It includes a chip, an antenna and two detection strips. The two detection strips and the antenna are electrically connected to the chip. The two detection strips are used to contact the liquid. The chip has a built-in capacitance detection module for measuring humidity based on the capacitance change between the two detection strips.

2. The humidity detection electronic tag as claimed in claim 1, characterized in that: The antenna is a HF antenna or a UHF antenna, and includes a metal coil formed around.

3. The humidity detection electronic tag as claimed in claim 2, characterized in that: The two detection strips are metal strips parallel to each other, and a detection gap is formed between the two metal strips.

4. The humidity detection electronic tag as claimed in claim 3, characterized in that: The two metal strips are in the same rectangular strip shape and have the same width, and the width of the metal strip is greater than the width of the detection gap.

5. The humidity detection electronic tag as claimed in claim 4, characterized in that: The electronic tag for detecting humidity is embedded in the diaper, the two metal strips are used to detect the humidity of urine, and the chip calibrates the temperature and liquid level according to different humidity.

6. The humidity detecting electronic tag as claimed in claim 5, characterized in that: The metal strip is a conductive aluminum foil, and the two conductive aluminum foils are connected to the antenna by using a conductive glue process or a dot-marking method.

7. The humidity detecting electronic tag as claimed in claim 6, characterized in that: The two conductive aluminum foils are made by vacuum plating and are combined to form a humidity sensor.

8. The humidity detecting electronic tag as claimed in claim 7, characterized in that: The humidity detecting electronic tag is a passive RFID electronic tag, which is used to perform a benchmark setting according to the change value of the capacitance and the humidity condition of the diaper to obtain a replacement threshold.

9. The humidity detecting electronic tag as claimed in claim 8, characterized in that: The metal coil is in the shape of a rectangular frame as a whole, and its length direction is parallel to the length direction of the conductive aluminum foil, and its length is smaller than the length of the conductive aluminum foil.

10. The humidity detecting electronic tag as claimed in claim 9, characterized in that: The metal coil is made of a metal sheet that gradually winds inward from a starting end until a triangular end is formed on the inner side; a connecting end adjacent to the starting end is also provided on one side of the metal coil, the starting end and the connecting end are arranged side by side and are electrically connected to the ends of the two conductive aluminum foils respectively, the connecting end is electrically connected to a metal frame wire, the metal frame wire extends around the periphery of the metal coil to an end away from the conductive aluminum foil, a triangular connecting block is provided on the outer side of a corner of a side of the metal coil away from the starting end, the triangular connecting block is integrally formed at the end of the metal frame wire, and is electrically connected to the triangular end through a cross-over line, and circular holes are provided on the triangular connecting block and the triangular end.

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