Rotary head device having a motor within the rotary drum, and magnetic recording and reproducing apparatus using the same
US5119257A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 26, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jan 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotary head device having a rotary drum and a rotating motor within the rotary drum, with the stator of the motor being supported by a fixed arm attached to a fixed drum or to a fixed drum supporting member. The construction permits the manufacture of the rotary head device using the manufacturing equipment used for conventional rotary shaft type rotary head devices despite the rotary head device being a thin device. In this rotary head device the position of contact of a ground brush and a rotor can be set at the center of rotation or thereabouts, so despite it being a thin device, the sliding speed of the ground brush is low, and hence it is possible to prevent the abrasion of the ground brush and also to prevent increase of the rotative driving torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.