Security tag for compact disc storage container

Details Security tag for compact disc storage container Security tag for compact disc storage container

1990-09-24

1992-01-14

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340568, G08B 1314

Patent

active

050814460

ABSTRACT:
A security tag for a compact disc container holding a compact disc is comprised of a generally flat substrate which includes circuitry for establishing a resonant circuit. The substrate is positioned within the compact disc storage container such that a first portion of the substrate extends beyond the periphery of the compact disc and a second portion of the substrate overlaps at least a portion of the compact disc. A part of the circuitry is located on each of the first and second portions of the substrate so that the frequency of the resonant circuit is established at least in part by interaction between the circuitry and the compact disc. The security tag is used in an electronic security system for a surveilled area, including a transmitter for transmitting electromagnetic energy into the surveilled area at a predetermined detection frequency and a receiver for detecting the presence of a security tag resonating at a detection frequency within the surveilled area.

REFERENCES:
patent: 4021705 (1977-05-01), Lichtblau
patent: 4567473 (1986-01-01), Lichtblau
patent: 4774521 (1988-09-01), Okada
patent: 4914421 (1990-04-01), d'Alayer de Costemore d'Arc

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