Electronic article surveillance (EAS) system
Electronic article surveillance (EAS) systems are used for inventory control and to prevent theft and similar unauthorized removal of articles from a controlled area. Electronic article surveillance systems allow the identification of a marker or tag within a given detection region. EAS systems have many uses, but most often they are used as security systems for preventing shoplifting in stores or removal of property in office buildings. EAS systems come in many different forms and make use of a number of different technologies. The EAS systems typically utilize interrogation zones that must be traversed to remove articles from the controlled area. An electronic article surveillance system detectable label is attached to every article that is to be protected. When an unauthorized article removal is attempted, the EAS system detects the label as the article traverses the interrogation zone. The electronic article surveillance responds to the detected label with an alarm condition and a preselected action is taken. When an article is properly purchased or otherwise authorized for removal from the protected area, the EAS marker is either removed or deactivated. If the EAS marker is not removed or deactivated, the electromagnetic field causes a response from the EAS marker in the interrogation zone. A typical EAS system includes an electronic detection unit, markers and/or tags, and a detacher or deactivator. An antenna acting as a receiver detects the EAS marker's response indicating an active marker is in the interrogation zone. An associated controller provides an indication of this condition such that appropriate action can be taken to prevent unauthorized removal of the item from the protected area. The markers and/or tags have special characteristics and are specifically designed to be affixed to or embedded in merchandise or other objects sought to be protected. Electronic article surveillance (EAS) systems have employed either reusable EAS tags or disposable EAS tags to monitor articles. The reusable labels normally placed on the goods at the commercial establishment by a clerk and are removed from the goods by the clerk with a special tool before the customer exits the store. The label is then reused by having the clerk place the label on another article. The disposable tags are generally attached to the packaging by adhesive or are disposed inside the packaging. These tags remain with the articles and must be deactivated before they are removed from the store by the customer. Deactivation devices use coils which are energized to generate a magnetic field of sufficient magnitude to render the EAS tag inactive.
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