Single-track video ferrite record/reproduce head and manufacturing method therefor
US4017899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1976 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Mar 22, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/187
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two magnetic ferrite pieces having longitudinal channels formed in the side faces thereof are bonded together with a gapping substance so that the resultant channels form a window. The bonded pieces are precisely slotted to a depth below the apex of the window to form a narrow track-defining comb-like array. The resulting slots are adapted to receive gap-protecting compatible ceramic support material which is so chosen as to wear slightly faster than the ferrite surfaces. In one embodiment, the slots contain ceramic-convertible glass which is devitrified by firing the array. The assembly is then processed to form a ceramic-ferrite-ceramic or ceramic-ferrite transducer sandwich which may be further processed to form part of a magnetic record and/or reproduce head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.