Anti-tamper label
By designing anti-tamping RFID tags and using a structure of bent metal lines and pretangent lines, the problem of unrecognition after the label is torn off is solved, and the label's anti-tamping effect and simple production process are achieved.
Patent Information
- Application Number
- CN202420255175.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-02-01
AI Technical Summary
If the existing RFID tag is torn off and put back after it is removed, the system will not recognize it, resulting in the risk of theft of the goods.
Design an anti-tampered RFID tag, which uses an insulated carrier substrate and a radiation body composed of multiple bent metal wires, with a gap inside, the chip and the coupling feed ring form an inductor ring, and the pre-tangent line passes through the inductor ring, making the label easy to tear Bad, prevent complete removal.
The anti-tamping effect of RFID tags is achieved, the structure is simple, and can be produced by conventional etching method, using PET or PI as the bearing substrate, and the intermittent notch of the pre-tangent line avoids the coupling feed ring to ensure that the tag cannot be re-teared after being torn off. Identified by the system.
Smart Images
Figure CN222439969U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of RFID tags, in particular to an anti-tampering RFID tag. Background Art
[0002] RFID, a passive IoT identification technology, has been applied in a growing number of scenarios. In unmanned retail, RFID technology has been widely adopted due to its unique passivity, multi-readability, and cost-effectiveness. In unmanned retail, RFID tags are typically affixed to items. Once an item is removed, if the RFID system cannot read the item's corresponding RFID information, it is identified as having been taken by the customer, effectively purchasing the item, and the item is added to the customer's checkout list. However, if someone removes the item but removes the RFID tag and places it back in the identification area, the system will deem the item still present. Consequently, the item may be removed without the customer completing the checkout process, exposing the item to theft.
[0003] There are currently some anti-tampering RFID tags, but they generally use fragile substrates as the substrate for RFID tag antennas. Fragile substrates are usually paper, but paper cannot withstand direct immersion in acid or alkali solutions and cannot be directly produced using conventional etching methods. There are three conventional methods: 1. The paper needs to undergo special treatment, such as coating with a waterproof and acid- and alkali-resistant film, which is a relatively complex process; 2. First, the waterproof and acid- and alkali-resistant substrate is used to complete the production, and then the antenna layer is transferred to the fragile substrate after the production is completed. This method is not only complex but also wastes raw materials; 3. Printing is used for production, but this process is not yet mature. Summary of the Invention
[0004] In order to solve the above problems, the utility model provides an anti-tampering label, including an insulating carrier substrate and a radiating body, a coupling feed ring, a chip and a pre-cut wire located on the carrier substrate. The radiating body is composed of multiple bent metal wires and has a gap inside. The chip and the coupling feed ring are connected together to form an inductor ring. The width of the gap exceeds the width of the inductor ring. The inductor ring is located in the gap and does not contact the radiating body. It is characterized in that one end of the inductor ring connected to the chip exceeds the radiating body, the pre-cut wire passes through the part of the inductor ring that exceeds the radiating body, and the intermittent gap on the pre-cut wire avoids the coupling feed ring.
[0005] The inductive loop and the radiating body together constitute an RFID tag with far-field radiation capability.
[0006] The pre-cut lines are cut into the carrier substrate using a die cutter to create intermittent, linear notches. When external force is applied to the label, the pre-cut lines will tear first. This is a common pre-treatment method. The pre-cut lines pass through the portion of the inductor loop that extends beyond the radiating body. The intermittent notches on the pre-cut lines must avoid the coupling feed loop to avoid affecting its conductivity.
[0007] The radiator and inductor are made of conductive materials such as aluminum, copper, silver paste, and conductive ink. They are attached to an insulating carrier substrate, which can be made of ordinary materials such as coated paper, PET film, PI film, or PP film.
[0008] The radiating body is made of bent metal wire. The bending can reduce the overall size while ensuring the signal radiation characteristics. The radiating body has self-resonance characteristics. For example, the self-resonance of the radiating body can be designed to be between 920MHz and 925MHz, which complies with the frequency band specifications of China's ultra-high frequency RFID.
[0009] It should be noted that the position of the gap does not need to be in the middle of the radiation body, as long as it is inside the radiation body.
[0010] A self-adhesive adhesive can be pre-coated on the carrier substrate located on either side of the upper and lower sides of the pre-cut line for attachment to a target object.
[0011] The pre-cut line can be used as the pasting reference line, and the side with the chip is preferably pasted to the object. The advantage of this is that even if the partially coupled feed ring and the chip are pasted on a metal object to form a short circuit, induction between the radiating body and the feed ring can still be achieved through inductive coupling, thereby enabling the entire tag to communicate normally with the reader.
[0012] The chip should be kept as close to the pre-cutting line as possible, preferably 2-10mm. This ensures that the pre-cutting is not difficult, but also prevents the chip from being activated after being torn due to insufficient conductor length. To ensure a secure bond between the label and the item, the support substrate area can be increased. It's best to increase the length of this support substrate, rather than its width, to keep the cut line as short as possible, making it easier to break at the cut line during tearing.
[0013] This tamper-evident label has a strong tamper-evident effect and a simple structure. It can be produced using conventional etching methods, using PET or PI as the carrier substrate. The pre-cut lines prevent the label from being easily torn, preventing complete removal. The production process can be based on conventional etching methods, with a simple pre-cutting step added at the end. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of an anti-tamper label according to the first embodiment of the present invention.
[0015] Figure 2 This is a schematic diagram of the positional relationship between the radiation body and the gap therein according to the first embodiment of the present invention.
[0016] Figure 3 This is a schematic diagram of the inductor ring structure of Example 1 of the present utility model.
[0017] Figure 4 This is a schematic structural diagram of an anti-tamper label according to the second embodiment of the present invention.
[0018] Figure 5 This is a schematic diagram of the position where the anti-tamper label of the present invention is affixed to a product. DETAILED DESCRIPTION
[0019] It should be understood that in the description of the present invention, the orientations or positional relationships indicated by positional terms such as "length", "width", "inside", "upper" and "lower" are all based on the orientations or positional relationships shown in the accompanying drawings, where "length" is the vertical direction and "width" is the horizontal direction.
[0020] Example 1: Figures 1 to 3 The utility model provides an anti-tampering label including an insulating carrier substrate 1 and a radiating body 2, a coupling feed ring 3, a chip 4 and a pre-cut wire 5 located on the carrier substrate 1. The radiating body 2 is composed of a plurality of bent metal wires and has a gap 6 inside. The chip 4 and the coupling feed ring 3 are connected together to form an inductor ring 7. The width of the gap 6 exceeds the width of the inductor ring 7. The inductor ring 7 is located in the gap 6 and does not contact the radiating body 2. The utility model is characterized in that one end of the inductor ring 7 connected to the chip 4 exceeds the radiating body 2, the pre-cut wire 5 passes through the part of the inductor ring 7 that exceeds the radiating body 2, and the intermittent gap on the pre-cut wire 5 avoids the coupling feed ring 3.
[0021] Example 2: Figure 4 The gap 6 does not necessarily need to be located in the center of the radiator; it can be located inside the radiator. To ensure a more secure bond, the area of the substrate supporting the chip on the side to be bonded to the object should be significantly larger than the area enclosed by the attached inductor loop and pre-cut wires, preferably 5 to 15 times the area enclosed by the inductor loop and pre-cut wires.
[0022] like Figure 5When attaching this label to an object, the pre-cut line serves as the reference point. The portion containing the chip on one side of the line is attached to the object, while the radiator on the other side extends beyond the object. When the label is removed, it separates into two parts along the pre-cut line. The lower portion remains attached to the object due to the adhesive, while the upper portion, after being removed, becomes inoperable due to the lack of the chip. Even if the torn portion is replaced, the system will no longer be able to read the label's information.
Claims
1. An anti-tampering label, comprising an insulating carrier substrate (1) and a radiating body (2), a coupling feed ring (3), a chip (4) and a pre-cut wire (5) located on the carrier substrate (1), wherein the radiating body (2) is composed of a plurality of bent metal wires and has a gap (6) inside, the chip (4) and the coupling feed ring (3) are connected together to form an inductor ring (7), the width of the gap (6) exceeds the width of the inductor ring (7), the inductor ring (7) is located in the gap (6) and does not contact the radiating body (2), and is characterized in that: One end of the inductor ring (7) connected to the chip (4) extends beyond the radiating body (2), the pre-cut wire (5) passes through the portion of the inductor ring (7) that extends beyond the radiating body (2), and the discontinuous gap on the pre-cut wire (5) avoids the coupling feed ring (3).
2. The tamper-evident label according to claim 1, characterized in that: Use the pre-cut line as the reference line for pasting, and paste the side with the chip on the object.
3. The tamper-evident label according to claim 1, characterized in that: The distance between the chip and the pre-cut line is 2~10mm.
4. The tamper-evident label according to claim 2, characterized in that: The area of the supporting substrate on the side where the object is pasted is 5 to 15 times the area enclosed by the inductor loop and the pre-cut wire.