Electronic article surveillance markers for direct application to optically recorded media

US6097291A · kind A · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Ching-Long Tsai · Daxi District, TW
• Chester Piotrowski · White Bear Lake, US
• Rita M. Lunderville · Menomonie, US
• Norman L. Koning · Hastings, US
• John Fitzgerald · Limerick, IE

Key dates

• Filing date: May 25, 1999
• Grant date: Aug 1, 2000
• Expiry date: May 25, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/24
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An Electronic Article Surveillance (EAS) marker is adapted for direct application to optically recorded media such as compact disks, CD-ROM's, laser disks, digital video disks, and the like. The marker includes a support sheet and one or more marker elements which are positioned such that the mass distribution of the marker is symmetrically disposed about the center of the marker. This ensures that when the marker is properly positioned on the optically recorded media, the marker does not adversely affect the mechanical balance of the media.