EP1057148B1 - Anti-theft element - Google Patents

Abstract

The invention relates to an anti-theft element for acoustic magnetic security systems, comprising a module which is positioned in a housing and has at least one magnetic element and a metal platelet. To largely protect said element against manipulation, notably deactivation by strong magnetic fields, without a significant increase in size the invention provides for the magnetic element to be embodied by a magnetic film which is polarized in the direction of the north or south pole.

Description

The invention relates to a goods security element for acustomagnetic security systems, with an assembly arranged in a housing and comprising at least one magnetic element and a metal plate, the magnetic element being formed by the arrangement of a magnetic film polarized in the north pole or south pole orientation,

Such goods security elements, also called AM labels, which can be used in so-called acustomagnetic systems using acustomagnetic technology, are known per se and are used extensively. They are used to identify goods on which such labels are applied or in which such labels are inserted.

Known AM labels consist of a plastic housing, a metal plate and a magnetic plate. The magnetic plate has a north-south polarity and the metal plate is positioned at a precisely defined distance from it. The dimensions of the two plates are also precisely specified. The tolerances are in the range of tenths of a millimeter.

Acustomagnetic system locks, consisting of transmitter and receiver units, record the resonance at a frequency of approximately 58 kHz of such labels and trigger. In order not to trigger such labels, large alternating currents are generated by large copper coils, which erase the north-south pole structure located on the magnetic stripe. The acustomagnetic system locks no longer respond.

However, such labels can also be manipulated very easily. This is done, for example, by deliberate deactivation.

There are areas of application that are particularly sensitive to theft, for example CD departments of department stores, music stores and the like. Here, a different system is used instead of the deactivatable labels, the labels being placed in so-called safers that remain in the shop. But here, too, the security systems can be manipulated by applying pressure, mechanical bending or deletion in the sense described above.

From US-PS 4,510,489 a security device is known in which the magnetic element is formed by arranging two magnetic materials with high coercivity at opposite ends of a magnetizable strip, the two magnetically high coercive materials being arranged so that they are a single one Induce pole pair alignment.

The present invention is based on the above. The prior art is based on the object of providing an article security element which largely prevents manipulation without increasing the structural shape.

To solve this problem technically, the invention further develops a security device of the generic type in that it cannot be deactivated, that is to say is designed to be permanently activated.

Technically, this object is achieved in that a strip (5) of the magnetic film polarized in the north pole orientation and a strip (6) of the magnetic film polarized in the south pole orientation are introduced on opposite sides of the article security element (1). It has surprisingly been found that flexible magnetic strips, one with a north pole orientation and one with a south pole orientation, arranged on opposite sides of the label, can be adjusted together with the metal plate to a frequency of approximately 58 kHz. For this, the dimension of the magnetic strips and the distance are opposite the metal plate essential. It has been found to be particularly advantageous to have a magnetic film strip approximately 1.4 mm high, approximately 1.5 cm long and approximately 2 mm wide. These strips are placed on diagonally opposite sides of the label. It has surprisingly been found that such labels can no longer be deactivated with conventional deactivation units.

Such permanently activated labels are therefore particularly suitable for systems in which the security element remains within a security area. Special fuse housings, so-called safers, can therefore be provided with labels according to the invention, so that the safer labels can no longer be manipulated. This results in increased security. The designs are not enlarged, but miniaturizations are possible. The economic manufacturing effort remains low.

Fig. 1 -

eine schematische perspektivische Ansicht eines Ausführungsbeispiels für ein Warensicherungselement;

Fig. 2 -

eine Draufsicht auf das Element gemäß Figur 1 und

Fig. 3 -

eine Stirnansicht des Elementes gemäß Figur 1.

Further advantages and features of the invention result from the following description with reference to the figures. Show:

Fig. 1 -

a schematic perspective view of an embodiment of a security device;

Fig. 2 -

a plan view of the element of Figure 1 and

Fig. 3 -

2 shows an end view of the element according to FIG. 1.

1 to 3 show an exemplary embodiment for an article security element 1. This consists of a carrier 2 in which the metal plate 3, for example so-called metal glass, is inserted. As FIG. 3 shows, the carrier 2 has a cross section with rounded longitudinal edges.

A frame 4 is positioned on a surface of the carrier, preferably as an assembly aid.

Magnets 5 and 6 are arranged diagonally opposite one another. These are the strips of a flexible film with appropriate polarization.

The dimensions of the article security element 1 essentially correspond to the dimensions of the article security element known per se, so that these can be replaced without further notice, without the need for new devices.

The exemplary embodiment described serves for explanation and is not restrictive.

Part number list

1 -

Merchandise security element

2 -

carrier

3 -

metal plate

4 -

frame

5 -

magnet

6 -

magnet

Claims (4)

1. An anti-theft element for use with acoustomagnetic anti-theft systems containing a subassembly, arranged in a housing and comprising at least one magnetic element (5, 6) and a thin metal plate (3), wherein the magnetic element (5, 6) is formed from a polarized flexible magnetic foil being aligned in a north pole and a south pole direction, respectively,
   characterized in that
   one strip (5) of the magnetic foil polarized in a north pole alignment and one strip (6) of the magnetic foil polarized in a south pole alignment are brought in at opposite sides of the anti-theft element (1 ).
2. An anti-theft element (1) according to one of the preceeding claims, characterized by the fact that the magnetic foil (5, 6) has a height of 1,4 mm, a length of 1,5 cm and a width of approximately 2 mm.
3. An anti-theft element (1) according to one of the preceeding claims, characterized by the fact that the strips (5, 6) of the magnetic foil which are magnetized with a north pole alignment and a south pole alignment and the thin metal plate (3) are adjusted to a resonance of approximatelxy 58 kHz.
4. An anti-theft element (1) according to one of the preceeding claims, characterized by the fact that the anti-theft element (1) is accommodated in a housing with dimensions that correspond to conventional AM labels.