Magnetic disk drive having a position detection unit for detecti

Details Magnetic disk drive having a position detection unit for detecti Magnetic disk drive having a position detection unit for detecti

1997-02-03

2000-06-06

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, 360106, G11B 5596

Patent

active

060726555

ABSTRACT:
In a magnetic disk drive for driving a magnetic disk inserted thereinto, a position detection unit comprises a scale and a photointerrupter. The scale is mounted on a carriage at a side opposed to a main surface of a main frame. The scale has a plurality of slits which are equally spaced along the scale in a direction parallel to a predetermined radial direction. The photointerrupter is mounted on the main frame. The photointerrupter comprises a light-emitting section and a light-receiving section which are opposed to each other with the scale arranged therebetween. The position detection unit may comprise a magnetic scale and a magnetic sensor. The magnetic scale has a plurality of magnetic poles which extend to a in a direction parallel to with the predetermined radial direction and which are periodically reversed at regular intervals. The magnetic sensor is opposed to the magnetic scale. Preferably, the magnetic sensor may comprise of a magneto-resistive element.

REFERENCES:
patent: 5177648 (1993-01-01), Inoue
patent: 5270886 (1993-12-01), Nigam
patent: 5305159 (1994-04-01), Sakai et al.
patent: 5587852 (1996-12-01), Yoshiura et al.

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