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Acoustic magnetic anti-theft label with stable property and easy manufacture

An anti-theft label, non-ferromagnetic technology, applied in the direction of electric alarms, record carriers used by machines, instruments, etc., can solve the problem of label alarm distance changes, bias field changes sharply, labels can not reach the best alarm distance, etc. question

Inactive Publication Date: 2014-05-21
NINGBO XUNQIANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct contact between the resonant plate and the bias plate makes the bias field change more violently
The eddy current generated by the metal of the bias plate also affects the resonance amplitude of the resonant plate, resulting in obvious changes in the label alarm distance in all directions
It is especially important that the tag cannot achieve the optimal alarm distance

Method used

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  • Acoustic magnetic anti-theft label with stable property and easy manufacture
  • Acoustic magnetic anti-theft label with stable property and easy manufacture
  • Acoustic magnetic anti-theft label with stable property and easy manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 2 As shown, an acoustomagnetic anti-theft label with stable performance and easy manufacture includes a long and narrow box body 3, a resonant sheet 2 and a bias sheet 1, and the box body is covered with a box composed of double-sided adhesive tape 5 and sealing film 6. Cover, the box body and the lid are closed to form a resonant cavity 7, the resonant plate and the bias plate are arranged in the resonant cavity, and a piece of non-ferromagnetic and non-metallic spacer 6 is also provided in the resonant cavity, the spacer Separate the bias plate from the resonant plate. There are three resonant plates and one bias plate.

[0022] In this embodiment, the bias plate is not fixed in the resonant cavity. Generally, the thickness of the separator is controlled within the range of 0.1-1.2mm. The spacer can be made of non-ferromagnetic and non-metallic materials, which can be paper or plastic.

[0023] The manufacturing method of the acoustomagnetic anti-t...

Embodiment 2

[0027] The specific solution is the same as that in Embodiment 1, except that in this embodiment, both ends of the bias plate are fixed to the inner wall of the box, so that the bias plate is fixed at the bottom of the resonance cavity.

Embodiment 3

[0029] The specific scheme is the same as embodiment one, and the difference is that in the present embodiment, the spacer is two pieces, see image 3 .

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Abstract

The invention relates to a commercial antitheft warning device and a manufacturing method thereof, in particular to an acoustic magnetic anti-theft label with stable property and easy manufacture. The acoustic magnetic anti-theft label with stable property and easy manufacture comprises a narrow box body, at least one resonance member and at least one polarization member, wherein a cover consisting of a double faced adhesive tape and a sealing film covers on the box body, a resonant cavity is formed by sealing the box body and the box cover, and the at least one resonance member is arranged in the resonance cavity; and at least one inhibiting film is made from a nonferromagnetic and nonmetal material and is further arranged in the resonance cavity, and the at least one polarization member and the at least one resonance member are separated by the inhibiting film. At the moment, according to the different positions of the inhibiting film, one of structures is that the polarization member is arranged in the resonant cavity, and the other one structure is that the polarization member is arranged outside the resonant cavity. Therefore, polarization fields are uniformly distributed by the structure, vortex can be eliminated, and a best warning structure can be maintained.

Description

technical field [0001] The invention relates to a commercial anti-theft protection alarm device and a manufacturing method, in particular to an acoustomagnetic anti-theft label with stable performance and easy manufacture. Background technique [0002] Acoustomagnetic anti-theft labels have been widely used in the anti-theft of various commodities, and the structure of the current acoustomagnetic anti-theft labels is generally (see figure 1 , figure 1 The upper part is the convex side of the resonant cavity, figure 1 The bottom is the convex side of the resonant cavity downward): the resonant plate is sealed in the resonant cavity, and the bias plate is fixed outside the resonant cavity. In this way, when the label is on the convex side of the resonant cavity, the distances t1 and t2 between the resonant plate and the bias plate change greatly, resulting in a large change in the actual bias field. This further causes a large change in the resonance frequency of the tag, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/067G08B13/24
Inventor 李霖
Owner NINGBO XUNQIANG ELECTRONICS TECH
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