Video head assembly having discrete arcurate ceramic pieces on rotor between heads
US4040110A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Sep 12, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video head assembly employing ceramic-ferrite transducer heads, the present invention proposes modification of head assembly components, i.e., the recording tape vacuum guide and the head wheel, so that a head assembly may be provided which possesses an operating lifetime commensurate with the ceramic-ferrite transducer heads. The invention proposes a head wheel having an outer surface which will wear to an unacceptably out-of-round condition at a significantly slower rate than present head wheels. To complement the proposed head wheel, the invention further proposes a tape guide having a guide surface so constructed as to wear more slowly than present tape guides so the radius as defined by the SMPTE will be maintained for more tape hours, thus helping to retain the proper guide surface contour throughout the life of the transducer heads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.