Capacitive sensor for head positioning in magnetic recording dis

Dynamic information storage or retrieval – Simultaneous diverse types of storage or retrieval

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Details

369126, 360 7703, 360103, G11B 1300, G11B 5596

Patent

active

048232050

ABSTRACT:
A capacitive sensor for detecting capacitive contrast servo information on a disk in a data recording disk file includes a center-tapped inductor connected to a high frequency oscillator, a sensing probe formed on the back side of the slider and electrically coupled to one end of the inductor, and a dummy probe also formed on the back side of the slider and electrically connected to the other end of the inductor. The center-tapped inductor forms a primary coil of a transformer so that variations in capacitance sensed by the sensing probe provide a differential output signal in the inductor which is sensed by the transformer secondary coil. The probes, and their electrically conductive leads and terminal pads, are formed by thin film deposition techniques on the back side of the slider and are located with respect to the inductive read/write head so as to equally receive any noise generated by the read/write head. The dummy probe is spaced away from the air bearing surface of the slider so that the variation in capacitance due to the capacitive contrast pattern on the disk is received only by the sensing probe.

REFERENCES:
patent: 4400807 (1983-08-01), Furuichi et al.
patent: 4556597 (1985-12-01), Best et al.
patent: 4639906 (1987-01-01), Goto
patent: 4648087 (1987-03-01), Scranton et al.
Klaassen, K. B., "Capacitive Servo Detector", IBM Technical Disclosure Bulletin, vol. 26, No. 6, Nov. 1983, pp. 2942-2946.
Clemens, J. K., "Capacitive Pickup and the Buried Subcarrier Encoding System for the RCA VideoDisc", RCA Review, vol. 39, Mar. 1978, pp. 33-41.

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