CN209842675U

CN209842675U - Radio frequency anti-theft label

Info

Publication number: CN209842675U
Application number: CN201920726675.2U
Authority: CN
Inventors: 黄宗杭
Original assignee: Shanghai Electronic Science And Technology Co Ltd Of Ratio Of Greater Inequality Section
Current assignee: Shanghai Electronic Science And Technology Co Ltd Of Ratio Of Greater Inequality Section
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2019-12-24
Anticipated expiration: 2029-05-20

Abstract

The utility model discloses a radio frequency anti-theft label, including the surperficial substrate layer, two-layer conductive coil about being equipped with below the surperficial substrate layer is equipped with the bond line below the lower floor's conductive coil, is equipped with insulating medium, a serial communication port between the upper and lower two-layer conductive coil, insulating medium be the wax layer. The utility model discloses changing insulating medium into wax, having improved the Q value of label, and as long as add in when processing the label can, do not need purchase CPP film and carry out complicated manufacturing process, reduce the processing cost, and compare in prior art, use the more environmental protection of label after the wax, because the wax of liquid state can be according to the free thickness regulation that carries on of manufacturing process, the thickness of effectual control label.

Description

Radio frequency anti-theft label

Technical Field

The utility model relates to a radio frequency anti-theft label belongs to electronic tags technical field.

Background

Currently, electronic tags are used in various aspects, and some of the electronic tags are marked and some of the electronic tags are used for preventing theft, for example, radio frequency anti-theft tags. Security tags are affixed to various products in a store and the presence of the security tags can be checked when passing through a security checkpoint or area. The radio frequency anti-theft label comprises a surface base material, wherein two layers of metal foil coils are arranged below the surface base material, the two layers of metal foil coils are separated through an insulating medium, the two layers of metal foil coils are connected together through an adhesive, and an adhesive layer is arranged on the bottom surface of each metal foil coil and used for being fixed on a product. Whether a radio frequency anti-theft tag is good or not is checked, and the radio frequency anti-theft tag is distinguished through the high and low of the Q value of the radio frequency anti-theft tag, wherein the higher the Q value is, the better the radio frequency anti-theft tag is. (Q value is a main parameter for measuring an inductance device, and means the ratio of the inductance presented by an inductor to the equivalent loss resistance when the inductor works under the alternating voltage of a certain frequency, and the higher the Q value of the inductor is, the lower the loss is, the higher the efficiency is.)

The currently used insulating medium is resin, a CPP film (a CPP film is a casting polypropylene film, also called an unstretched polypropylene film) or common plastic, and due to factors such as cost, efficiency and the like, most of the CPP films are used, the CPP films are compounded between two layers of metal foil coils, the processing technology is complex, and a large amount of static electricity can be generated and retained in the processing process of the CPP, so that the radio frequency tag is easily killed by the static electricity in the later processing process; the CPP film belongs to the class of plastics, is produced in a chemical mode, and is environmentally-friendly from the aspect of environmental protection; the CPP film needs to be purchased from a merchant, and the cost is high.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the problem of how to improve radio frequency anti-theft tag Q value is solved.

In order to solve the technical problem, the utility model provides a radio frequency anti-theft label is provided, including the surperficial substrate layer, two-layer conductive coil about being equipped with below the surperficial substrate layer is equipped with the bond line below the lower floor's conductive coil, is equipped with insulating medium between the upper and lower two-layer conductive coil, its characterized in that, insulating medium be the wax layer.

Preferably, the conductive coil is a metal foil coil.

Preferably, the surface base material layer is bonded with the upper conductive coil through an adhesive; the upper and lower layers of conductive coils are respectively bonded with the insulating medium through adhesives.

Preferably, the melting point of the wax layer is 40 ℃ to 200 ℃.

Preferably, the wax layer comprises paraffin wax, microcrystalline wax, PE wax, synthetic wax, animal or vegetable wax, or a multi-layer insulating medium structure or mixture containing wax.

The utility model provides an insulating medium uses wax, the multilayer insulating medium structure or the mixture of wax-containing, has improved the Q value of label, and as long as add in when processing the label can, do not need purchase CPP film and carry out complicated processing technology, reduce the processing cost, and compare in prior art, use the environmental protection more of label behind the wax, because the wax of liquid state can be according to the free thickness regulation that carries on of processing technology, the thickness of effectual control label.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a radio frequency anti-theft tag;

fig. 2 is an exploded view of an rf security tag.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The utility model relates to a radio frequency anti-theft label, as shown in figure 1 and figure 2, which comprises a surface substrate layer 1, wherein an upper conductive coil and a lower conductive coil are arranged below the surface substrate layer 1, a bonding layer 5 is arranged below the lower conductive coil, an insulating medium is arranged between the upper conductive coil and the lower conductive coil, and the surface substrate layer 1 is bonded with the upper conductive coil through an adhesive; the upper and lower layers of conductive coils are respectively bonded with the insulating medium through adhesives. The conductive coil is a metal foil coil, namely the upper conductive coil is a first metal foil coil 2, and the lower conductive coil is a second metal foil coil 4. The insulating medium is a wax layer 3, and the wax layer 3 is respectively bonded with the upper and lower conductive coils through adhesives. The wax layer 3 comprises paraffin wax, microcrystalline wax, PE wax, synthetic wax (coal fired wax, fischer tropsch wax), animal or vegetable wax or a multi-layer insulating medium structure or mixture containing wax. The melting point of the wax layer 3 is 40-200 ℃. During processing, the wax layer 3 is liquefied and adhered between the two conductive coils.

The quality factor can be written as the energy stored in the Q2 pi circuit/the energy consumed in one cycle of the circuit;

the passband BW is related to the resonant frequency w0 and the quality factor Q by: BW is w0/Q, which indicates that Q is large and the passband is narrow, and Q is small and the passband is wide.

The Q value is calculated by the formula: q is omega L/R is 1/omega RC;

wherein:

q is a quality factor;

ω is the power supply frequency at which the circuit resonates;

l is an inductance;

r is the resistance of the string;

c is a capacitance;

the Q value is a quality factor, which is the ratio of active power to total active power;

respectively coating the adhesive and the wax on the surface of the metal foil by a roller coating method and drying.

In this example, microcrystalline wax having a melting point of 40 ℃ was used for the wax layer 3.

The conventional product Q value on the market is 60 +/-5, the utility model discloses a Q value is 95 +/-5, and Q value size and metal antenna's size also has the relation, generally directly proportional. An example is a 40mmX40mm size.

A table illustration is provided according to patent CN 200410059023-method of manufacturing a resonant tag and an embodiment of a resonant tag.

	Comparative example 1	Comparative example 2	The utility model discloses
				Material	Aluminium	Aluminium	Aluminium
Thickness (obverse/reverse)	40μm/40μm	50μm/10μm	50μm/50μm
				Dielectric medium	Resin coating film	Polyethylene film	Wax coating film
L (inductor)	0.154μH	3.06μH	0.08741μH
				Coil resistor	0.03976mΩ	0.6860mΩ	0.046mΩ
Measured value	60	58	98

Example 2

In this example, polypropylene wax having a melting point of 170 ℃ was used for the wax layer 3.

The rest is the same as in example 1.

Claims

1. The radio frequency anti-theft label comprises a surface base material layer (1), an upper conductive coil and a lower conductive coil are arranged below the surface base material layer (1), an adhesive layer (5) is arranged below the lower conductive coil, and an insulating medium is arranged between the upper conductive coil and the lower conductive coil, and is characterized in that the insulating medium is a wax layer (3).

2. The radio frequency tag of claim 1, wherein said conductive coil is a metal foil coil.

3. The radio-frequency anti-theft tag according to claim 1, wherein the surface substrate layer (1) is bonded with the upper conductive coil through an adhesive; the upper and lower layers of conductive coils are respectively bonded with the insulating medium through adhesives.

4. A radio frequency tag according to claim 1, wherein said wax layer (3) has a melting point of 40 ℃ to 200 ℃.

5. The radio frequency tag according to claim 1 or 4, wherein the wax layer (3) comprises paraffin wax, microcrystalline wax, PE wax, synthetic wax, animal or vegetable wax or a multi-layer insulating medium structure or mixture containing wax.