System for position detection on a rotating disk

Details System for position detection on a rotating disk System for position detection on a rotating disk

1982-12-30

1986-05-06

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 360 78, 369 14, G11B 555

Patent

active

045875790

ABSTRACT:
An information reading/writing head is positioned to follow data tracks that are formed concentrically on a magnetic recording disk. A set of spiral radial position-indicating markings if formed which can be detected on the disk optically, or capacitively. The position of the head is determined by sensing the spiral markings. The reference for the phase detection is detected by sensing radial indicia on the disk periphery or spiral markings of servo data with a different pitch and frequency from the position-indicating spiral markings. A servo control system operated by the above disk, reads the radial position-indicating spiral pattern and the reference pattern on the disk and compares the relative phases of the two to compute the track position of the head. A set of phase-locked loops with subsequent phase comparators is used to decode the servo data.

REFERENCES:
patent: 3212074 (1965-10-01), Daniels et al.
patent: 3426337 (1969-02-01), Black et al.
patent: 3879753 (1975-04-01), Dunn
patent: 3898690 (1975-08-01), Desai
patent: 4157577 (1979-06-01), Porter, Jr. et al.
IBM Technical Disclosure Bulletin, vol. 23, No. 2, Jul. 1980, pp. 787-789, Servo System for Magnetic Recording Based on Time Comparison, E. Gruss et al.

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