VCR head drum coated with diamond-like hard carbon films and the method and apparatus for manufacturing the same
US5938838A · kind A · utility
0Cited by
7References
5Claims
0Family size
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Key dates
| Filing date | Mar 19, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Mar 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A head drum is coated with double films, each having different characteristics, by forming a first diamond-like hard carbon film of high degree of hardness and then forming a second diamond-like hard carbon film of a lower degree of hardness thereon. The degree of hardness of the second film is lower than that of the first film. The double coating is performed by means of a synthesizing apparatus which comprises a reactor consisting of a power supply electrode, a workpiece support and and an annular ground electrode spaced from the stacked head drums by a predetermined distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.