DE20008705U1 - Special transponder for use on or in a metallic environment as well as in an elevated temperature environment - Google Patents

Description

Special transponder for use on or in metallic environments and in elevated temperature environments

2.2 State of the art

Electronic transponders usually consist of a coil and an electronic transponder chip as well as a resonance capacitor, which is usually integrated into the transponder chip by the manufacturer.

These two components are usually inserted into plastic parts such as coins and key chains or plastic cards and glued or laminated. Transponders are used today in numerous areas such as time recording, warehouse logistics and process data acquisition.

2.3. Issue

The transponders specified in claim 1 are based on the problem of creating a transponder that can also be used and read in an environment in which the transponder's function is normally influenced or even completely disrupted by metallic influences.

Furthermore, a transponder had to be created that could also be used in harsh conditions (for example in machine and tool construction).

These transponders can no longer be manufactured in the conventional way because the metal changes the inductance value of the coil to an unknown extent and thus detunes the resonance frequency of the transponder.

2.4. Solution

The problem is solved with the construction of claims 1.1 to 1.5.

This is a transponder in which the coil is shielded from the metallic environment by a special ferrite core.

2. Description

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2.5. Benefits achieved

Due to its special shape (see drawing of pot core), the ferrite core directs the magnetic field of the transponder in a specific direction (front side open) and at the same time shields the opposite side.

The ferrite core largely determines the inductance of the coil and thus the resonance frequency of the transponder.

The transponder is then glued into a metal housing in the correct position and

shed.

The potting compound also serves as an orientation for the transponder direction.

2.6. Further development

The advantages of the above-mentioned design arise from the excellent properties of the transponders in terms of readability in metallic objects such as high shelves but also in machines and systems.

Coupled with the mechanical and thermal resilience provided by the installation of a metal or plastic housing, a component was created that can be used in a wide range of applications, such as statistical process control on machines, etc.

Furthermore, the transponder's high thermal resilience means it can be used in systems where a conventional transponder does not offer the necessary reliability. The metal housing also contributes to the mechanical protection of the transponder.

The above-mentioned transponders can be designed as screws (see drawing: Transponder screw MIO) and are therefore very

easy to assemble

Claims (5)

1. Special transponder for use on or in metallic environments and in elevated temperature environments, characterized in that the receiving coil of the transponder chip is glued into a special ferrite core (see drawing: ferrite core for metal transponders) 2. Transponder according to protection claim 1, characterized in that the shielded coil can additionally be built into a metallic housing (see drawing: coin tag for metal). 3. Transponder according to protection claim 1, characterized in that the shielded coil can also be installed in a special plastic housing, such as Teflon for higher temperatures. 4. Transponder according to protection claim 1, characterized in that the shielded coil, after installation in the above-mentioned housing, is glued to this housing with a special high-temperature-resistant 2-component casting resin. 5. Transponder according to protection claim 1, characterized in that a special ferrite (FeZn) with an extremely low temperature drift is used for the transponder.