Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-03-23
1997-09-02
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7806, 360 7813, 360105, 318811, 388804, G11B 2102
Patent
active
056638469
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a large-capacity storage device for use with an information processing apparatus, and more particularly to a loading and unloading apparatus for starting and stopping a rotary-disk storage device such as a magnetic disk, an optical disk, or the like, and a drive control circuit for such a loading and unloading apparatus.
BACKGROUND ART
There has heretofore been known a magnetic disk device of the ramp loading type, i.e., a magnetic disk device of the dynamic loading/unloading type, which is a version of the so-called non-contact start-stop (N-CSS) system in which a magnetic head is held out of contact with a disk. Such a magnetic disk device is arranged as shown in FIG. 1 of the accompanying drawings.
As shown in FIG. 1, a magnetic disk device 1 includes a magnetic disk 2 which can be rotated and an actuator 3 which supports a head slider for movement in a slightly floating condition radially over the surface of the magnetic disk 2.
The actuator 3 comprises an arm 5 supported for rotation about a rotational shaft 4, a head slider 7 supported on a distal end of the arm 5 by a suspension 6, and a voice coil motor having a voice coil 8 for rotating the arm 5 about the rotational shaft 4.
The head slider 7 has a magnetic head (not shown).
The magnetic disk device 1 also includes a cam follower 6a extending from a distal end of the suspension 6, and a cam 9 disposed in the vicinity of an outer circumferential edge of the magnetic disk 2. These components make up a loading and unloading apparatus.
With the magnetic disk device 1 thus arranged, the head slider 7 is kept slightly floated off the surface of the magnetic disk 2 which is rotating.
When the arm 5 is rotated about the rotational shaft 4, the head slider 7 moves radially over the surface of the magnetic disk 2 thereby accessing tracks positioned circumferentially on the magnetic disk 2.
When the magnetic disk device 1 starts and stops operating, loading and unloading operations are carried out as follows:
In the loading operation, the arm 5 is turned about the rotational shaft 4 by the voice coil 8 to move the cam follower 6a radially inwardly of the magnetic disk 2, i.e., in the direction indicated by the arrow R1 from a parking area 9a of the cam 9.
As the arm 5 is turned, therefore, the head slider 7 is lifted over the magnetic disk 2 and thereafter lowered along a cam surface 9b of the cam into a position near the surface of the magnetic disk 2.
In the unloading operation, the arm 5 is turned about the rotational shaft 4 by the voice coil 8 to move the cam follower 6a radially outwardly of the magnetic disk 2. While the cam follower 6a is being held in abutment against the cam surface 9b, which is a slanted surface, of the cam 9, the cam follower 6a is lifted and moved in the direction indicated by the arrow R2 toward the parking area 9a.
As the arm 5 is turned, therefore, the head slider 7 is moved away from the surface of the magnetic disk 2, and thereafter lifted along the cam surface 9b of the cam 9. Subsequently, the head slider 7 is carried onto the parking area 9a of the cam 9.
The loading speed is generally given as a considerably high speed for enabling the head slider 7 to move from the parking area 9a onto the magnetic disk 2 against the resistance due to the friction between the cam follower 6a and the cam 9.
The unloading speed is generally given also as a considerably high speed for enabling the head slider 7 to move from the magnetic disk 2 onto the parking area 9a against the resistance due to the friction between the cam follower 6a and the cam 9.
In case of emergency such as a power failure while the head slider 7 is floating, the magnetic disk device 1 unloads the head slider 7 to retract the same. The unloading speed at this time (the unloading speed at the time the head slider 7 is retracted will hereinafter be referred to as a "retracting speed") is generally given as a considerably high speed. The retraction is an Unloading action in case of emergency.
A magnetic disk device
REFERENCES:
patent: 4329721 (1982-05-01), Lee
patent: 4864437 (1989-09-01), Couse et al.
patent: 5128568 (1992-07-01), Carpenter
patent: 5384675 (1995-01-01), Crawforth et al.
patent: 5455496 (1995-10-01), Williams
Electric Motors & Their Controls, by Kenja, .COPYRGT.1991 pp. 130-135.
Masuoka Dai
Toru Takeda
Faber Alan
Kananen Ronald P.
Psitos Aristotelis M.
Sony Corporation
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