Coarse and fine head positioning apparatus which uses a slidable

Details Coarse and fine head positioning apparatus which uses a slidable Coarse and fine head positioning apparatus which uses a slidable

1993-11-24

1996-05-21

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 7804, 360 7805, 369223, G11B 555

Patent

active

055195539

ABSTRACT:
This invention provides a small-sized and easy-assembling head positioning apparatus having a coarse moving mechanism and fine moving mechanism, by which the desired fine moving accuracy is easy to attain. A head positioning apparatus has a first stepping motor, a lead screw, and a cylindrical rack for coarse moving. The cylindrical rack is formed by rotating a rack around the axis of the lead screw and is provided with the lead screw. The head positioning apparatus has a second stepping motor and gears for reducing the speed of the rotation of the second stepping motor for fine moving means, and fine moving is carried out by moving the cylindrical rack by the gear. The lead screw is provided so that the first stepping motor could be moved in a X1, X2 direction in the fixed moving range.

REFERENCES:
patent: 3774172 (1973-11-01), Silverman
patent: 4630145 (1986-12-01), Thompson et al.
patent: 4829394 (1989-05-01), Tokuda et al.
patent: 4845697 (1989-07-01), Giddings
patent: 4875120 (1989-10-01), Takahashi et al.
patent: 5164931 (1992-11-01), Yamaguchi et al.

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