Rotary head drum unit
US5237478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Jul 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotary head drum unit for a recording/reproducing apparatus comprises a stationary upper drum provided at its lower end with a taper surface for biasing a magnetic tape downward, a stationary lower drum provided in its circumference with a helical tape lead or guide surface to guide the lower edge of a tape helically extended across the upper and lower drums, and rotary heads inserted between the upper and lower drums. At least a portion of the taper surface of the upper drum in a lead-out region near a position where the magnetic tape departs from the rotary head drum unit is a helical taper section extended helical substantially in parallel to the helical tape lead or guide surface of the lower drum. The taper surface having the helical taper section is able to bias the magnetic taper downward in the lead-out region so that the lower edge of the magnetic tape is guided securely by the helical tape guide surface of the lower drum and keeps the upper edge of the magnetic tape taut through the entire arc of contact of the magnetic tape with the rotary head drum unit, so that the magnetic tape is secured for stable running.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.