Antipilferage tags having an acoustic resonator chamber

Details Antipilferage tags having an acoustic resonator chamber Antipilferage tags having an acoustic resonator chamber

1989-04-27

1991-03-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1318

Patent

active

049996096

ABSTRACT:
An antipilferage tag (10) includes an acoustic resonator chamber (12) which has a membrane (1,2) formed of a layer of magnetostrictive material (2) as well as a system which may incorporate such tags. The system has a generator for generating an alternating magnetic field and a tag capable of interacting with the alternating magnetic field to generate an alarm tone, characterized in that (i) the alarm tone is generated by a tag which includes an acoustic resonator; and (ii) the generator for generating an alternating magnetic field and the tag are so arranged that an audible alarm tone is generated by the tag when it is subjected to the alternating magnetic field.

REFERENCES:
patent: 4622543 (1986-11-01), Anderson, III et al.

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