Record stylus for capacitance disks

Details Record stylus for capacitance disks Record stylus for capacitance disks

1982-03-12

1985-03-05

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369173, G11B 906

Patent

active

045035296

ABSTRACT:
For detection of signals recorded in the form of minute pits along tracks as capacitance variations, a record stylus is disclosed as comprising a shank having a portion of cross-sectional area decreasing toward one end of the stylus. A diamond, partially embedded in the shank, has a decreasing cross-sectional area toward said end of the stylus as a continuation of the decreasing cross-section of the shank. The bottom and rear face of the diamond are inclined so that the adjacent angle therebetween is smaller than 90 degrees. An electrode attached to the rear face of the diamond extends from the bottom of the diamond toward the other end of the stylus. The electrode is thus inclined in a direction opposite to the direction of movement of the recording medium to provide less concentration of electric lines of force on the rear bottom edge thereof.

REFERENCES:
patent: 2992007 (1961-07-01), Bondley
patent: 4052738 (1977-10-01), Hosomi et al.
patent: 4152641 (1979-05-01), Hughes et al.
patent: 4199782 (1980-04-01), Wada et al.
patent: 4340954 (1982-07-01), Chio et al.

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