Title:
消磁場形成防止式磁気EASマーカ活性化方法及び装置
Document Type and Number:
Japanese Patent JP3877780
Kind Code:
B2
Abstract:
A two-dimensional array of magnetomechanical markers is adhered to a continuous web. A magnetizer element is scanned across the web to magnetize the bias elements in a group of the markers with a first polarity, thereby activating the group of markers. The web is then advanced and the magnetizer is scanned across the web in an opposite direction to the previous scan, to magnetize the bias elements of a second group of the markers with a second polarity, thereby activating the second group of markers. The web is slit in a longitudinal direction to produce web-strips each carrying a column of the activated markers. The web-strips are rolled to form marker roll assemblies each having about half the bias elements magnetized with a first polarity and the remaining bias elements magnetized with an opposite polarity. The roll of activated markers forms no more than a minimal "leakage" magnetic field.
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Inventors:
Richard Elle, Copeland
Ryan, Min Earl
Ryan, Min Earl
Application Number:
JP52254198A
Publication Date:
February 07, 2007
Filing Date:
September 12, 1997
Export Citation:
Assignee:
SENSORMATIC ELECTORONICS CORPORATION
International Classes:
G08B13/24; H01F13/00
Foreign References:
| US5469140 |
Attorney, Agent or Firm:
Yuzo Yamazaki
Kiko Okada
Naomi Mae
Kiko Okada
Naomi Mae