Theft-proof label used in sound-magnetic electronic article monitoring system

Abstract

The invention provides a theft-proof label used in a sound-magnetic electronic article monitoring system, which comprises a box body, wherein an amorphous resonance sheet and a bias magnetic sheet are arranged in the box body, and the bias magnetic sheet is made from carbon steel; and the bias magnetic field strength of the bias magnetic sheet is more than or equal to 2.5Oe and is less than or equal to 4Oe, and the size of length, width and thickness is between 30 x 4 x 0.05mm and 32 x 6 x 0.1mm. The invention breaks through the traditional design idea of the anti-theft label, uses non-rectangular magnetic carbon steel as the bias magnetic sheet, and combines and uses the carbon steel as the bias magnetic sheet so as to enable the various parameters of the theft-proof label to meet use requirements by reducing the bias magnetic field strength to 2.5 to 4Oe; in addition, the carbon steel needs not to be subject to heat treatment and can be used as a material of the bias magnetic sheet by direct cold rolling, thereby significantly reducing the cost of the anti-theft label.

Description

technical field [0001] The invention relates to an anti-theft label used in an acousto-magnetic electronic article monitoring system. Background technique [0002] The anti-theft tag is an identification device applied in the electronic article monitoring system, which can interact with the electromagnetic field arranged at the exit of the goods to indicate whether the removal of the goods is legal. Based on whether it can be reused or not, anti-theft tags are divided into soft tags and hard tags. Hard tags can be reused because they can be degaussed and remagnetized repeatedly, but their manufacturing costs, maintenance costs are high, and they are large in size. The application of goods sales places such as supermarkets is gradually replaced by soft labels. The soft label is a one-time identification device, which contains an amorphous resonator and a magnetic bias element. When the goods are sold, after the bias magnetic element is demagnetized, the label will lose its f...

AI Technical Summary

Problems solved by technology

In this way, the bias magnetic sheet needs to use expensive alloy materials such as iron, nickel, chromium, and cobalt, such as FeNiTi, FeCrCoNi, FeMn, FeNiMo, FeCu, FrCrCo, FrCr, FeCoV, FCrCo, FeNi, etc., and, in the process of processing In order to achieve the required coercivity and consistency of the bias magnetic sheet and the DC remanence of the bias magnetic sheet, a very demanding annealing heat treatment method must be used...

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