Track seeking using a track following loop

Details Track seeking using a track following loop Track seeking using a track following loop

1987-11-23

1989-06-13

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 44, G11B 7085

Patent

active

048398764

ABSTRACT:
An optical disk recorder includes a position servo control loop for causing a beam of radiation to faithfully follow a track on the disk, jump from a current track to an adjacent track or to a small number of tracks away from the current track. Operation of the position servo loop is altered by selectively reversing the phase of a differentiated position error signal and integrating the differentiated position error signal for comparison with a sawtooth signal for moving the beam of radiation from the current track to an immediately adjacent track under continuous position servo control. Upon reaching the adjacent track, the sawtooth signal returns to a reference potential for initiating track following. The servo error between the integrated differentiated position error signal and the sawtooth signal is sufficiently small such that relaxation of the sawtooth signal does not cause any significant perturbations in the positioning servo loop operation. A velocity long seek servo can be substituted for the position servo loop for more rapid long seeks.

REFERENCES:
patent: Re32051 (1985-12-01), Ceshkovsky et al.
patent: 2843841 (1958-07-01), King et al.
patent: 3473164 (1969-10-01), Jensen
patent: 3480919 (1969-11-01), Jensen et al.
patent: 4217612 (1980-08-01), Matla et al.
patent: 4613963 (1986-09-01), Hirano
patent: 4659972 (1987-04-01), Uchikoshi et al.
patent: 4701898 (1987-10-01), Giddings
patent: 4731771 (1988-03-01), Maeda et al.
patent: 4748607 (1988-05-01), Nakane

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