Optical information storage disk for use with electronic article

Details Optical information storage disk for use with electronic article Optical information storage disk for use with electronic article

1992-04-22

1994-09-13

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Combined with diverse art structure

340572, 369292, G11B 724, G08B 1308

Patent

active

053475089

ABSTRACT:
An optical information storage disk especially adapted for tamper-proof monitoring by an electronic article surveillance (EAS) system. The compact disk hereof includes a generally planar, annular first disk surface and an opposed, generally annular second disk surface, a plurality of generally concentric data tracks on at least one of the disk surfaces, a centered aperture and a generally annular EAS magnetic marker concentrically oriented about the centered aperture. The annular EAS marker comprises a dual status, multi-directional marker with a selectively demagnetizable, essentially linear magnetic switching field. The marker is preferably received within a grooved recess in one of the disk surfaces and is immovably retained within the grooved recess by a coating covering the disk surface.

REFERENCES:
patent: 4692746 (1987-09-01), Budin et al.
patent: 4709813 (1987-12-01), Wildt
patent: 4710754 (1987-12-01), Montean
patent: 4794470 (1988-12-01), Lauffenberger et al.
patent: 4910625 (1990-03-01), Albrecht et al.
patent: 4967185 (1990-10-01), Montean
patent: 5012380 (1991-04-01), Harissis et al.
patent: 5081446 (1992-01-01), Gill et al.

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