Stylus for capacity change detection type disc system

Details Stylus for capacity change detection type disc system Stylus for capacity change detection type disc system

1984-04-06

1987-02-24

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369173, 427 38, C23C 1100, G11B 700

Patent

active

046462821

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.

REFERENCES:
patent: 4296144 (1981-10-01), Maby et al.
patent: 4420675 (1983-12-01), Takehara

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