Disc driving device employing a seven drive head positioning uni

Details Disc driving device employing a seven drive head positioning uni Disc driving device employing a seven drive head positioning uni

1987-02-18

1988-10-18

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

744248R, G11B 555

Patent

active

047791551

ABSTRACT:
In a disc driving device with a carriage moving means including a screw shaft formed with a single spiral groove on an outer circumference thereof, the spiral groove being formed by a plurality of circumferential groove portions each having a greatly small lead angle and a straight bottom, the groove portions being sequentially shifted in an axial direction of the screw shaft, a stepping motor for rotatively driving the screw shaft, and a carriage having an engagement means adapted to be engaged with the spiral groove; the improvement is characterized in that each of the groove portions is divided into three parts, that is, a central small groove corresponding to a normal track position and both adjacent small grooves corresponding to a fine adjustment position, and that both the adjacent small grooves are axially shifted from the central small groove by an amount required for predetermined fine adjustment.

REFERENCES:
patent: 4638677 (1987-01-01), Fuke

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