Precision measurement and positioning system for disk storage sy

Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly

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Details

356358, 360 7811, 360 7812, G11B 700, G11B 2504, G11B 2102

Patent

active

048706353

ABSTRACT:
The invention uses a small sized, low cost, high accuracy, semiconductor laser interferometer to position the transducer in a disc storage system. Light is reflected back over the path to be measured and directly back into the semiconductor laser. This causes the power present in the laser to be varied. Unexpectedly, the output of the photosensor associated with the laser has an asymmetric, sawtooth waveform.

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patent: 4531167 (1985-07-01), Berger
patent: 4706234 (1987-11-01), Okada

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