Bulk tape erasing system
US4462055A · kind A · utility
12Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jan 4, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/0245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A degaussing head is mounted on a tape drive transport unit adjacent to a rotating reel of tape. The degaussing head is selectively energized by a signal indicating that the tape is to be erased. Preferably, the degaussing head takes the form of an E-shaped iron core driven by a coil supplied with attenuated DC current. The degaussing head is mounted on the door of the tape drive transport cabinet in such a manner that when the door is closed the legs of the degaussing head orthogonally span the tape in the reel to provide an attenuated alternating magnetic field for bulk erasing the tape as it is rotated past the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.