Capacitance detection type record stylus having a conductive sha

Details Capacitance detection type record stylus having a conductive sha Capacitance detection type record stylus having a conductive sha

1982-03-12

1984-12-11

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369173, G11B 900

Patent

active

044882815

ABSTRACT:
A capacitance detection type record stylus comprises a conductive shank and a diamond partially embedded in the shank so that the diamond projects downwardly from one end of the shank. The shank is formed with a bottom face for making slidable contact with the disk record. The shank and diamond are formed with a pair of common rear faces inclined with respect to the axis of the stylus to define an electrode forming face therebetween which extends from the bottom face of the diamond partially into the shank. The electrode forming face is inclined at an acute angle with respect to the axis so that the lower end of the electrode forming face is located at a point forward with respect to the upper end thereof and subtends at the lower end thereof at such an angle that the diamond can be lapped without causing defects to occur on the lapped surfaces. The electrode forming face is entirely covered by a conductive layer so that the latter establishes electrical connection with the shank to allow signals detected by the electrode to pass through the shank to an external circuit.

REFERENCES:
patent: 2992007 (1961-07-01), Bondley
patent: 4162510 (1979-07-01), Keizer
patent: 4165560 (1979-08-01), Matsumoto
patent: 4199782 (1980-04-01), Wada et al.
patent: 4340954 (1982-07-01), Chio et al.

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