Anti-theft electronic tag for laser welding

Abstract

The utility model relates to a laser welding anti-theft electronic tag which comprises a thin film layer, a first metal circuit layer and a second metal circuit layer, wherein the first metal circuit layer and the second metal circuit layer are arranged on two sides of the thin film layer; the first metal circuit layer comprises a first capacitor plate, a coil and a first connecting line, and the second metal circuit layer comprises a second capacitor plate and a second connecting line; the first capacitor plate, the second capacitor plate, the first connecting wire and the second connecting wire are correspondingly arranged on two sides of the thin film layer; the welding structure is characterized in that the first connecting line and the second connecting line form a welding point in a laser welding mode. According to the invention, the processing precision of the connection point of the electronic tag is higher, the quality is higher, the speed is higher, the appearance consistency is better, the firmness of the connection point is better, and the performance of the electronic tag is more stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of anti-theft electronic tags (EAS tags), and in particular to an anti-theft electronic tag welded by laser welding. Background Technology

[0002] Electronic tags mainly consist of a coil surface, a film layer, and a capacitor surface, which are bonded together with adhesive. The coil surface (the side primarily containing the coil circuit and part of the capacitor circuit) and the capacitor surface (the side primarily containing part of the capacitor circuit) are connected by aluminum foil to form an LC resonant circuit, as shown in the attached diagram. Figure 1 This LC oscillation circuit, under the influence of a spatial electromagnetic field, can generate LC oscillations through electromagnetic induction, emitting a specific frequency radio frequency signal. This signal is then recognized by a corresponding antenna system, triggering an alarm and achieving anti-theft functionality. Electronic tags can be designed with circuits of different sizes, shapes, and thicknesses to achieve varying tag performance and recognition strength.

[0003] Existing technology for connecting the aluminum foil separating the coil and capacitor sides of the thin film layer mainly involves mechanical perforation to physically connect the two aluminum foil layers of the circuit. This is achieved by using a flat-press file to perforate the aluminum foil on both sides of the electronic tag's coil and capacitor sides, thus creating conductivity. Figure 2 Existing mechanical connection points have the following drawbacks: low precision (prone to misalignment), low production efficiency, and the mechanical files are prone to wear during frequent operation, leading to poor metal connection between the coil and capacitor sides of the electronic tag, affecting product connection performance and production yield. Visually, these mechanical connection points are irregularly shaped with protrusions. Some protrusions are thick, some are thin, some are penetrated, and some are not (not properly connected). Because the connection points are mechanical, the finished tags are easily affected by external environmental factors, such as temperature fluctuations causing thermal expansion and contraction, which can lead to failure and limit the application range of the tags. Utility Model Content

[0004] The purpose of this invention is to provide a laser-welded anti-theft electronic tag, which mainly solves the problems existing in the prior art. It can make the processing accuracy of the connection point of the electronic tag higher, the quality higher, the speed faster, and the appearance more consistent, while also making the connection point stronger and the electronic tag more stable and reliable.

[0005] The specific technical solution of this utility model is as follows:

[0006] A laser-welded anti-theft electronic tag includes a thin film layer and a first metal circuit layer and a second metal circuit layer disposed on both sides of the thin film layer; the first metal circuit layer includes a first capacitor plate, a coil, and a first connecting line, and the second metal circuit layer includes a second capacitor plate and a second connecting line; the first and second capacitor plates, the first and second connecting lines are all correspondingly disposed on both sides of the thin film layer; the first and second connecting lines are characterized in that the first and second connecting lines form welding points by laser welding.

[0007] The laser-welded anti-theft electronic tag is characterized in that: the welding points are multiple and have the same shape.

[0008] The laser-welded anti-theft electronic tag is characterized in that: the welding points are multiple and arranged in an array.

[0009] The laser-welded anti-theft electronic tag is characterized in that: the welding points are multiple and form a grid shape.

[0010] The laser-welded anti-theft electronic tag is characterized in that the materials of the first metal circuit layer and the second metal circuit layer are aluminum foil.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The electronic tag of this invention forms welding points on its first and second connecting lines using laser welding. This structure enables higher processing precision, higher quality, faster processing, and better appearance consistency at the connection points of the electronic tag (eliminating problems such as irregular connection point shapes, protrusions, uneven thickness, and inconsistent penetration). It also improves the strength of the connection points, making the electronic tag's performance more stable and reliable.

[0013] Because the welding points of this invention are formed by the high-temperature melting of metal, the welding points are relatively strong and are not affected by the external temperature. This eliminates the disadvantages of mechanical welding and makes the label's application range wider. It can be used on frozen products at lower temperatures as well as in environments with higher temperatures. Attached Figure Description

[0014] Figure 1 This is the circuit diagram of the anti-theft electronic tag (i.e., a schematic diagram of an LC oscillation circuit).

[0015] Figure 2 This is an external diagram of the mechanical connection point of an existing anti-theft electronic tag.

[0016] Figure 3 This is a structural schematic diagram of the anti-theft electronic tag of this utility model.

[0017] Figure 4 This is a schematic diagram of the processing method of the anti-theft electronic tag of this utility model.

[0018] Figure 5 This is a schematic diagram of the second processing method for the anti-theft electronic tag of this utility model.

[0019] Figure 6 This utility model of anti-theft electronic tag has multiple welding points. Figure 1 .

[0020] Figure 7 This utility model of anti-theft electronic tag has multiple welding points. Figure 2 .

[0021] Figure 8 This utility model of anti-theft electronic tag has multiple welding points. Figure 3 . Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 3 , 4 This is a schematic diagram of a laser-welded anti-theft electronic tag. As shown in the figure, it includes a thin film layer 2 and a first metal circuit layer 1 and a second metal circuit layer 3 (e.g., the material of the first metal circuit layer 1 and the second metal circuit layer 3 is aluminum foil) disposed on both sides of the thin film layer 2. The first metal circuit layer 1 includes a first capacitor plate, a coil, and a first connecting wire. The second metal circuit layer 3 includes a second capacitor plate and a second connecting wire. The first and second capacitor plates, the first connecting wire, and the second connecting wire are all correspondingly disposed on both sides of the thin film layer 2. The first and second connecting wires are laser-welded to form welding points 4.

[0024] The laser welding method forms the welding point 4 by irradiating the laser beam 5 onto the predetermined welding point position on the first or second connecting line of the electronic tag, causing the aluminum foil and film on both sides to melt at high temperature. The circuits on the first metal circuit layer 1 and the second metal circuit layer 3 are welded together after melting, making the entire circuit conductive and forming the LC circuit required by the electronic tag.

[0025] Figure 4 During the processing, the laser beam 5 irradiates from the second metal circuit layer 3 toward the first metal circuit layer 1 and processes the laser welding point. Figure 5In the latter case, during the processing, the laser beam 5 irradiates from the first metal circuit layer 1 towards the second metal circuit layer 3 and processes the laser welding points. The effect of both is essentially the same.

[0026] In this invention, the connection points are processed using laser welding. Lasers possess advantages such as high monochromaticity, high coherence, high directionality, and high energy. Laser welding enables higher precision, faster processing, and better appearance consistency at the electronic tag welding points. Furthermore, the high-temperature laser welding melts the metal, resulting in stronger weld points. Laser welding overcomes the limitations of existing connection technologies, making the processing of electronic tag connection points more precise and efficient, while also ensuring more stable and reliable electronic tag performance.

[0027] In this invention, the processed welding point 4 can be one or more. When the welding point 4 is processed into multiple parts, it can take the following forms:

[0028] The first form, such as Figure 6 There are multiple welding points 4, and they are all the same shape.

[0029] The second form, such as Figure 7 The welding point 4 has multiple points and is distributed in an array.

[0030] The third form, such as Figure 8 The welding point 4 has multiple points and forms a grid shape.

[0031] Regardless of the method used, the shapes of the connection points are relatively regular and neat, and the surfaces show traces of high-temperature welding, with some metal surfaces showing signs of charring and blackening. It is also very easy to distinguish between laser-welded and machined connection points by appearance.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A laser-welded anti-theft electronic tag, comprising a thin film layer (2) and a first metal circuit layer (1) and a second metal circuit layer (3) disposed on both sides of the thin film layer (2); the first metal circuit layer (1) includes a first capacitor plate, a coil, and a first connecting line, and the second metal circuit layer (3) includes a second capacitor plate and a second connecting line; the first capacitor plate and the second capacitor plate, the first connecting line and the second connecting line are all disposed on both sides of the thin film layer (2); characterized in that: The first connecting line and the second connecting line form a welding point (4) by laser welding.

2. The anti-theft electronic tag welded by laser according to claim 1, characterized in that: The welding point (4) has multiple points and is of the same shape.

3. The anti-theft electronic tag welded by laser according to claim 1, characterized in that: The welding point (4) has multiple points and is distributed in an array.

4. The anti-theft electronic tag welded by laser according to claim 1, characterized in that: The welding point (4) has multiple points and forms a grid shape.

5. The laser-welded anti-theft electronic tag according to claim 1, 2, 3, or 4, characterized in that: The first metal circuit layer (1) and the second metal circuit layer (3) are made of aluminum foil.

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