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    • 53. 发明公开
    • ANZEIGELEMENT FÜR DIE VERWENDUNG IN EINEM MAGNETISCHEN DIEBSTAHLSICHERUNGSSYSTEM
    • FOR USE IN A磁防盗系统显示器元件
    • EP0871945A2
    • 1998-10-21
    • EP96946049.0
    • 1996-12-06
    • Vacuumschmelze GmbH
    • HERZER, Giselher
    • C22C45G08B13G09F3H01L41
    • G08B13/2408C22C45/02G08B13/2442H01L41/20
    • A display element is proposed for use in a magnetic theft-prevention system comprising the following elements: an elongated ductile magnetostrictive strip of amorphous ferromagnetic material which can be activated and deactivated by applying and removing respectively a bias magnetisation field Hbias and can in the activated state be stimulated by an alternating magnetic field to generate longitudinal mechanical resonance vibrations of resonance frequency fr. The mechanical stresses resulting from the resonance vibrations cause the magnetisation of the strip to change detectably. The display element is characterised in that: the material has a flat B(H) loop which is as linear as possible as far as the saturation region; a strip of the material has a magnetic anisotropy perpendicular to the strip length and the anistropy field strength HK is greater than the bias magnetisation field strength Hbias; and a strip of the material in the activated state of slight variation in a test bias magnetisation field strength Hbias = 6 Oe undergoes a change in the resonance frequency dfr in relation to the change in the bias magnetisation field strength dHbias of 400 Hz/Oe ≤ |dfr/dHbias| ≤ 800 Hz/Oe; and the strip in transition from its activated to deactivated state undergoes a change in the resonance frequency Δ fr ≥ 1.2 kHz.