Stylus for capacity change detection type disc system
US4646282A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Apr 6, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/075
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A stylus for a capacity change detection type disc system which reads information signals such as audio or video signals out of a track which is formed in a disc surface as an arrangement of pits corresponding to the information signals has a body portion which is made of a diamond. Argon plus ions are implanted in the stylus body portion from the surface of the diamond portion to graphitize the diamond to provide a conductive layer which serves as a detecting electrode portion. The graphitizing rate is highest at the surface portion of the electrode portion which consists of the formed conductive layer. The graphitizing rate changes from the surface portion toward a portion remote from the surface portion, where the graphitizing rate is lowest, with a variation rate smaller than that of the graphitizing rate which would result from a single implantation of ions into the diamond.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.