Manufacturing methods of magnetomechanical electronic article surveillance markers
US6720877B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2001 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | May 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/244
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of making a magnetomechanical electronic article surveillance marker is provided that, in one embodiment, includes deposition or placing of at least one elongated bias magnet onto a substrate, depositing a cavity layer onto the substrate where the cavity layer defines an elongated cavity adjacent the bias magnet. Placing a magnetomechanical resonator into the cavity and sealing a cover onto the cavity layer wherein the resonator is captured in the cavity and free to mechanically vibrate substantially unencumbered. The substrate itself may be magnetic thereby eliminating a separate bias magnet. In an alternate embodiment, a cavity is molded in a plastic substrate sized to fit a resonator, and a cover is sealed to the substrate to capture a resonator in the cavity. At least one bias magnet is placed onto the cover adjacent the cavity and a second cover is sealed to the substrate, to the first cover, and to the bias fixing the bias in place adjacent the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.