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AssigneeSensormatic Electronics Corporation
InventorsDavid R. Humble, Jon N. Weaver, David L. Gentzler, Ezra D. Eskandry, Peter J. Lamanna
Estimating the term…
A continuous loop transmitting winding assembly is disposed in one panel and a vertically oriented figure eight receiving coil winding assembly is disposed in a second panel, the two panels being mounted on pivots for swinging gate type movement straddling the pathway to be controlled by a magnetic surveillance system. This arrangement confines the surveillance field to the pathway and tends to follow the passage of an object bearing a marker therealong. No marker detecting backfield is generated. Alternatively, one winding assembly is moveable while the other is stationary thereby similarly confining the field. Special winding configurations are used to reduce interference from third harmonic signals produced in adjacent metallic counters. The arrangement also imposes immunity to signals emanating from cash registers, motors and the like. Door and single gate mounted magnetic and microwave surveillance systems are also disclosed.
Apparatus for detecting the presence within a surveillance zone of an electrical energy responsive marker wherein a transmitter is coupled to an electrical energy field radiator for establishing throughout said zone an AC energy field, and a receiver is coupled to an electrical energy field receptor for detecting a predetermined alteration of said AC energy field caused by the presence of said marker within said AC energy field, characterized in that at least one of said radiator and receptor is disposed in a gate-like structure that is mounted for rotation to and fro about a vertical axis with substantially all of said structure extending horizontally to one side of said axis.
Apparatus for detecting the presence within a surveillance zone of a body of high permeability material wherein a transmitter is coupled to a first coil element for establishing in said zone an AC magnetic field, and a receiver is coupled to a second coil element for detecting a predetermined disturbance to said field caused by the presence of said body within said field, characterized in that said coil elements are mounted respectively on opposite sides of said zone, each element for rotation about a vertical axis, said elements being constructed and arranged to confine to a region straddled by said axes substantially all of said field that is effective for detecting said body.
Apparatus for detecting, witin a surveillance zone confined to a pathway along which a pedestrian is constrained to travel when proceeding between two areas within a building, the presence of an electrical energy responsive marker wherein a transmitter is coupled to an electrical energy field radiator for establishing throughout said zone an AC energy field, and a receiver is coupled to an electrical energy field receptor for detecting a predetermined alteration of said AC energy field caused by the presence of said marker within said AC energy field, characterized in that at least one gate-like structure is mounted on one side of said pathway for rotation to and fro about a vertical axis, said structure being rotatable about said axis between positions respectively barring and permitting passage of said pedestrian along said pathway, and at least one of said radiator and receptor is disposed in said structure.
Apparatus for detecting, within a surveillance zone region of an aisle traversed by shopping carts, the presence of an electrical energy responsive marker wherein a transmitter is coupled to an electrical energy field radiator for establishing throughout said zone an AC energy field, and a receiver is coupled to an electrical energy field receptor for detecting a predetermined alteration of said AC energy field caused by the presence of said marker within said AC energy field, characterized in that at least one of said radiator and receptor is disposed in a gate-like structure that is rotatably mounted relative to said aisle for movement between two positions, one of which is transverse to said aisle for barring passage of said cart along said aisle while the other of which is arranged to permit passage of said cart, and said radiator and receptor establish an effective surveillance zone for detecting all said markers that are carried along said aisle past said gate-like structure by a person propelling said cart.
Apparatus for detecting, within a surveillance zone region of an aisle traversed by shopping carts, the presence of an electrical energy responsive marker wherein a transmitter is coupled to an electrical energy field radiator for establishing throughout said zone an AC energy field, and a receiver is coupled to an electrical energy field receptor for detecting a predetermined alteration of said AC energy field caused by the presence of said marker within said AC energy field, characterized in that at least one of said radiator and receptor is disposed within a gate-like structure mounted for rotation about an axis positioned relative to said aisle for establishing said zone within said aisle and moveable between a first position transverse to said aisle for engagement by a shopping cart traversing said aisle and a second position substantially parallel to said aisle for permitting passage of said cart thereby.
Apparatus for detecting the presence within a surveillance zone of an electrical energy responsive marker wherein a transmitter is coupled to an electrical energy field radiator for establishing throughout said zone an AC energy field, and a receiver is coupled to an electrical energy field receptor for detecting a predetermined alteration of said AC energy field caused by the presence of said marker within said AC energy field, characterized in that at least one of said radiator and receptor is mounted for rotation about an axis through an arc no greater than 180.degree., and positioned relative to said zone, for confining to a region substantially entirely on one side of a given plane containing said axis, as it is rotated about said axis, that field which is effective to detect said marker.
Dependencies are inferred from the claim text.