Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2001-01-26
2002-04-09
Nguyen, Hoa T. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S097030, C360S097040
Reexamination Certificate
active
06369977
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk device and, more particularly, to a magnetic disk drive which has a high reliability and is capable of reducing windage vibrations of a magnetic head due to turbulent air currents produced by a rotating magnetic disk.
FIG. 6
shows a known magnetic disk device
600
disclosed in JP-A No. 2000-156068. The magnetic disk device
600
drives a magnetic disk
11
by way of a spindle motor
12
. A magnetic head for writing information to and reading information from the magnetic disk
11
is supported on the extremity of a suspension
21
. A carriage arm
25
supports the suspension
21
. The carriage arm
25
has a base end fixed to a pivot shaft
20
. A voice coil motor
28
drives the carriage arm
25
for turning. This prior art magnetic disk device
600
is provided with a filter
60
placed on an air passage
61
formed by cutting a portion of a shroud
41
.
SUMMARY OF THE INVENTION
The air passage
61
formed by cutting a portion of the shroud
41
as shown in
FIG. 6
often enhances the hydrodynamic vibrations of the magnetic disk
11
generally called disk fluttering
Accordingly, it is an object of the present invention to provide a magnetic disk device which has a high reliability and is capable of reducing windage vibrations of a magnetic head caused by air currents produced by a rotating magnetic disk.
With the foregoing object in view, according to a first aspect of the present invention, a magnetic disk device comprises a magnetic disk for recording information, a spindle motor for driving the magnetic disk for rotation, a magnetic head for writing information to and reading information from the magnetic disk, a carriage arm supporting the magnetic head, a voice coil motor for moving the carriage arm, a shroud forming a peripheral wall, a structure forming an air passage extending through a clearance between the voice coil motor and the shroud between a position on the upper side of the carriage arm with respect to the direction of rotation of the magnetic disk and a position on the lower side of the carriage arm with respect to the direction of rotation of the magnetic disk, and a filter placed in the air passage to clean air flowing through the air passage.
According to a second aspect of the present invention, a magnetic disk device comprises a magnetic disk for recording information, a spindle motor for driving the magnetic disk for rotation, a magnetic head for writing information to and reading information from the magnetic disk, a carriage arm supporting the magnetic head, a voice coil motor for moving the carriage arm, a loading/unloading mechanism for retracting the carriage arm from a position on the magnetic disk, a shroud forming a peripheral wall, and a structure forming an air passage extending through a clearance between the voice coil motor and the shroud between a position on the upper side of the carriage arm with respect to the direction of rotation of the magnetic disk and a position on the lower side of the carriage arm with respect to the direction of rotation of the magnetic disk.
According to a third aspect of the present invention, a magnetic disk device comprises a magnetic disk for recording information, a spindle motor for driving the magnetic disk for rotation, a magnetic head for writing information to and reading information from the magnetic disk, a carriage arm supporting the magnetic head, a voice coil motor for moving the carriage arm, a loading/unloading mechanism for retracting the carriage arm from a position on the magnetic disk, and a shroud forming a peripheral wall; wherein the rotating direction of the magnetic disk is the same as a direction from the free end of the carriage arm toward the base end of the same.
REFERENCES:
patent: 4725904 (1988-02-01), Dalziel
patent: 5636082 (1997-06-01), Shibuya et al.
patent: 6054833 (2000-04-01), Takeuchi
patent: 6125003 (2000-09-01), Tsuda et al.
patent: 6208484 (2001-03-01), Voights
Patent Abstract of Japan Publication No. 2000-156068 Date Jun. 6, 2000.
Goto Marutomo
Imai Satomitsu
Kouno Takashi
Nakamura Shigeo
Sega Masahiko
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Nguyen Dzung C.
Nguyen Hoa T.
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