Patent ID: 6020817
Filing Date: 2000-02-01
Classification: G08B

Abstract:
A roll assembly of magnetomechanical EAS markers, comprising:a backing sheet having a length extent and a width extent, said length extent being at least 10 times as long as said width extent; anda plurality of magnetomechanical markers adhered to said backing sheet, said markers each including an active element for resonating in response to an EAS interrogation signal and a bias element for applying a bias magnetic field to said active element, each said marker having a longitudinal axis and being oriented relative to said backing sheet so that said longitudinal axis is transverse to the length extent of said backing sheet, said plurality of markers consisting of a first subset and a second subset, the markers of said first subset having respective bias elements that are magnetized with a north polarity oriented in a first direction that is transverse relative to the length extent of said backing sheet, the markers of said second subset having respective bias elements that are magnetized with a north polarity oriented in a second direction that is transverse relative to the length extent of said backing sheet and is opposite to the first direction, each of said first and second subsets consisting of at least 30% and no more than 70% of said plurality of markers.