Head drum forming an air film between an outer surface thereof and a tape medium
US5041937A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 1990 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Feb 15, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A head drum for a recording and/or reproducing apparatus is provided. The head drum includes a rotary drum, a stationary drum, and a plurality of magnetic heads for recording and/or reproducing signals on a magnetic tape. A chamber is provided which includes a first circumferentially extending recessed portion formed on the rotary drum and a second circumferentially extending recessed portion formed in the stationary drum. A plurality of grooves are formed in a surface of the rotary drum which communicates between the chamber and the exterior of the head drum. In a first embodiment, the second recessed portion is eccentrically arranged to extend closer to a first position on an exterior surface of the head drum where the magnetic tape starts to wrap about the head drum than at a second position on said exterior surface. In an alternative embodiment, the second circular recessed portion has a greater depth from the first circular recessed portion at the first position than at the second position. The recesses are provided to form a uniform air film between the magnetic tape and the head drum in cooperation with circumambient air introduced therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.