Browse Prior Art Database

Cartridge Bulk Eraser

IP.com Disclosure Number: IPCOM000084580D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Thornley, RM: AUTHOR

Abstract

This device is useful for erasing magnetic recording media. For example, a cartridge of the type described in U. S. Patent 3,825,208 containing a wound reel of magnetic media can be completely erased in a single operation, by passing it through the annular opening in this device.

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Cartridge Bulk Eraser

This device is useful for erasing magnetic recording media. For example, a cartridge of the type described in U. S. Patent 3,825,208 containing a wound reel of magnetic media can be completely erased in a single operation, by passing it through the annular opening in this device.

The device, shown in section, consists of permanent ring magnet 2 with an annulus sufficient to allow a cartridge to pass through it.

The magnet is enclosed within a magnetically permeable cylindrical enclosure 4. The enclosure includes entrance 6 and exit 8 aligned with the opening through the magnet 2. In operation a cartridge can be inserted into entrance 6, through magnet 2 and out of exit 8 in a single operation to entirely erase magnetic data recorded on the media within the cartridge.

This device can be utilized either alone or as a gate on a library exit. For example, where it is built into all of the cartridge exits of a library system no cartridge can be removed from the library without being automatically erased. This provides one means to protect data security.

This device is of great utility as it does not require that the media be unrolled in order to erase it. Additionally, since it utilizes a permanent magnet, it requires no electrical power and is always "on". Due to the construction of the device most of the magnetic field is maintained within the boundaries of the magnetically permeable enclosure 4, and the external field is of such a small magnit...