Track pitch calibration system for use in optical storage device

Details Track pitch calibration system for use in optical storage device Track pitch calibration system for use in optical storage device

1984-07-06

1986-03-25

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

346 76L, 369111, G11B 700

Patent

active

045787867

ABSTRACT:
A system and method for maintaining a prescribed track pitch in an optical storage system wherein a second radiation beam is aligned a desired distance from a first radiation beam, the first radiation beam being controllably steered to follow a previously written data track on a record carrier used within the optical storage system. A write alignment servo aligns the second radiation beam the prescribed distance from the first radiation beam in response to an offset signal. The offset signal is generated by optically measuring the distance between a pair of calibration tracks that have previously been placed on the disk so as to have the desired track pitch therebetween. The effect of variations or drift occurring in the optical or electrical components of either the write alignment servo or the optical track pitch measurement system is significantly reduced by regularly calibrating against the fixed track pitch of the calibration tracks.

REFERENCES:
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4167024 (1979-09-01), Hamisch
patent: 4283777 (1981-08-01), Curry et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4432083 (1984-02-01), Hsieh et al.
patent: 4504939 (1985-03-01), Eberly

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