Jaký princip používá odpojení EAS k odemknutí?

EAS, the full name of Electronic Article Surveillance, the principle of EAS Detacher mainly relies on the deactivation or removal of the anti-theft tag, and the specific implementation method depends on the type of EAS system. The following is an explanation of the core principles:

1. EAS system type and corresponding unlocking principle

RF system

Tag principle: The tag contains an LC resonant circuit (inductor-capacitor), which resonates with the specific frequency (such as 8.2MHz) emitted by the detection door to trigger the alarm.

Unlocking method: Magnetic release: Use a strong magnetic field (such as a permanent magnet or electromagnetic device) to destroy the capacitor or inductor in the tag, making the resonant frequency invalid.

RF signal interference: Transmit a specific frequency signal to cover the tag resonance, or directly rewrite the tag circuit (high-end equipment).

Acoustic magnetic (AM) system

Tag principle: Use magnetostrictive material to vibrate and reflect a specific frequency (about 58kHz) signal under the alternating magnetic field of the detection door.

Unlocking method: Pulse magnetic field: EAS Detacher uses high-intensity magnetic pulses to saturate the magnetization of the tag material and lose its vibration characteristics.

Mechanical destruction: directly smash the fragile components inside the tag (such as illegal physical unlocking methods).

Electromagnetic (EM) system

Tag principle: EAS Detacher is based on magnetic metal strips, and the detection door identifies undemagnetized tags through magnetic flux changes.

Unlocking method: Demagnetization: Use an alternating attenuation magnetic field (such as a demagnetizer) to disrupt the magnetic domain arrangement of the tag's magnetic material, making it unable to trigger an alarm.

2. The difference between legal and illegal unlockers

Legal unlockers: used by merchants when checking out, such as demagnetization equipment at supermarket checkout counters, and tags are safely deactivated through standardized operations.

Illegal unlockers: copying EAS frequencies or using strong magnetic fields/physical destruction may involve legal risks.

3. Attention Notes

Technical neutrality: EAS Detacher technology itself is neither good nor evil, but abuse may violate the law (such as anti-theft system circumvention).

Physical protection: Some tags contain ink capsules, and violent removal will cause damage to the goods.