Antipilferage system utilizing "figure-8" shaped field producing

Details Antipilferage system utilizing "figure-8" shaped field producing Antipilferage system utilizing "figure-8" shaped field producing

1977-05-24

1979-01-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

179 82, G08B 1324

Patent

active

041351835

ABSTRACT:
An improved apparatus for producing a magnetic field within an interrogation zone for detecting perturbations in the field produced by the presence of a ferromagnetic marker element includes at least a pair of field producing coils, each of which is substantially planar and is positioned on opposite sides of the interrogation zone such that the planes of the coils are parallel to each other and to a corridor defined therebetween. Each of the coils are of substantially the same overall dimension and have either a "figure-8" or "hour-glass" shape, each half of which is symmetric about a horizontal axis passing through a crossing or necked-in portion and consist of a substantially triangular shape.

REFERENCES:
patent: 3758849 (1973-09-01), Susman et al.
patent: 3765007 (1973-10-01), Elder
patent: 3838409 (1974-09-01), Minasy et al.
patent: 3938125 (1976-02-01), Benassi

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