Circuit arrangement for applying high frequency energy to a capa

Details Circuit arrangement for applying high frequency energy to a capa Circuit arrangement for applying high frequency energy to a capa

1982-09-09

1985-01-22

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

G11B 906, G11B 1700

Patent

active

044956100

ABSTRACT:
A circuit arrangement comprises a first delay circuit which is responsive to the leading edge of a command signal to generate a first signal a delay time after the occurrence of the leading edge and a second delay circuit which is responsive to the trailing edge of the command signal to generate a second signal a delay time after the occurrence of the trailing edge. A stylus control solenoid responds to the leading edge of the command signal for lowering the stylus into slidable contact with the surface of a capacitance disc record and further responds to the second signal for lifting the stylus from the record. A high frequency source is arranged to respond to the first signal by generating high frequency energy for application to the electrode of a capacitance detection stylus and further responds to the trailing edge of the command signal.

REFERENCES:
patent: 3870320 (1975-03-01), Torrington
patent: 4017678 (1977-04-01), Baker
patent: 4086617 (1978-04-01), Baker

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