Non-contact head with variable clearance compensating means

Details Non-contact head with variable clearance compensating means Non-contact head with variable clearance compensating means

1987-03-03

1988-08-30

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360109, 340347P, G11B 512, G11B 510, G11B 548

Patent

active

047681195

ABSTRACT:
A non-contact detection head which compensates for variation and the spacing between a detection head and a circular recording medium. The recording medium has a magnetized pattern recorded along the periphery thereof, and is mounted on a central rotary shaft. A detection head is spaced from and faces the recorded pattern on the recording medium and generates an output as a function of the recorded pattern. In one embodiment, pneumatic means is provided for preventing fluctuations in the clearance between the recording medium and the detection head from influencing the output of the detection head. In a second embodiment, a mechanical arrangement is provided to achieve this result. In a third embodiment, an electrical circuit is provided to compensate for fluctuations in the clearance between the recording medium and the detection head.

REFERENCES:
patent: 3992576 (1976-11-01), Sugiura

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