JPH0474357A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce an effect of thermal off-track by orienting the seek direction of a magnetic head at right angles to the direction of dead weight of a spindle. CONSTITUTION:The seek direction of the magnetic head 3 is at right angles to the direction of the dead weight of the spindle 2. That is, the direction of dead weight of the spindle 2 is conformed to the direction of a load of a radial spring 8, and a carriage 5 is fixed in a position on a base plate 4 where the seek direction of the magnetic head 3 is orthogonal to the direction of the dead weight of the spindle 2. In this case, when a temp. rise of the magnetic disk device and an environmental temp. change, etc, take place, the fitting condition of a bearing into a bearing fitting hole on the base plate is changed due to a difference of thermal expansion coeffts. of the relevant parts, so that the spindle 2 is inclined by pressing force of the radial spring 8 to generate thermal off-track. By this method, the thermal off-track is diminished, and hence the magnetic head is accurately positioned to amgnetic disk 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a spindle that loads a plurality of magnetic disks at predetermined intervals, and a magnetic head that records and reproduces information on and from the magnetic disks. The present invention relates to a magnetic disk device including a carriage for mounting a magnetic disk and positioning it in a designated cylinder of a magnetic disk.

[Conventional technology]

2. Description of the Related Art In recent years, the storage density of magnetic disk devices has increased as the storage capacity has increased, and along with this, it has become necessary to improve the positioning accuracy of the magnetic head with respect to the magnetic disk.

The magnetic head positioning means in a magnetic disk device includes a dedicated magnetic head (servo head) for positioning operation, and positioning information is recorded in advance on a storage surface (servo surface) of a magnetic disk corresponding to this servo head. The positioning information is then read by a servo head. Therefore, the relative positional deviation between the servo head and other magnetic heads and the relative positional deviation between the servo surface and the storage surface of other magnetic disks is a deviation from the track that should originally be followed. ie, the off-track amount, and the smaller the off-track amount, the higher the positioning accuracy.

However, in actual magnetic disk drives, off-traffic overflow exceeding the allowable limit may occur due to various factors. In particular, off-track caused by an increase in the temperature of the magnetic disk drive itself or a change in environmental temperature is called thermal off-track and is one of the biggest causes.

Thermal off-track is caused by differences in thermal expansion coefficients between the mechanical parts that make up the magnetic disk drive.

FIG. 3 is a plan view showing an example of a conventional magnetic disk device.

The magnetic disk device shown in FIG. 3 has a plurality of magnetic disks 1
1 are stacked at predetermined intervals and mounted on a spindle 12 to rotate. A plurality of magnetic heads 13 for recording and reproducing information on the magnetic disk 11 are held by a plurality of magnetic helad arms 17, and the magnetic helad arms 17 are held by a carriage 15. The carriage 15 performs a positioning operation by causing the magnetic head 13 to seek in the direction of arrow C. On the other hand, the spindle 12 has its own weight in the direction of arrow B, and the directions C and B are not perpendicular to each other.

[Problem to be solved by the invention]

In the conventional magnetic disk drive described above, a load is applied in the radial direction to remove the play between the spindle 12 and the base plate 14, and the load is applied in the radial direction so as not to adversely affect the thermal off-track. The seek direction of the magnetic head 13 is perpendicular to arrow C). However, in the direction of spindle 12's own weight, arrow B
) and the seek direction (arrow C) of the magnetic head 13 are not perpendicular to each other. The load and the direction of the weight of the spindle 12 (arrow B) are different from each other, which has an adverse effect on the thermal off-track.

The problem to be solved by the present invention, in other words, the purpose of the present invention is to solve the above-mentioned drawbacks of conventional magnetic disk devices, and to solve the problem of thermal An object of the present invention is to provide a highly reliable magnetic disk device that reduces the effects of off-track.

[Means to solve the problem]

The magnetic disk device of the present invention includes: a spindle for stacking a plurality of magnetic disks at predetermined intervals; a plurality of magnetic heads provided corresponding to the recording surfaces of the plurality of magnetic disks; and the magnetic head. a plurality of arms that hold the plurality of arms; a carriage that holds the plurality of arms and positions the magnetic head in a designated cylinder of the magnetic disk; and the spindle and the carriage are mounted and fixed in a predetermined position. In the magnetic disk device, the seek direction of the magnetic head is perpendicular to the direction of the weight of the spindle.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

The first section is a plan view showing one embodiment of the present invention, and the second section is a plan view showing an embodiment of the present invention.
The magnetic disk drive shown in FIGS. 1 and 2, which are cross-sectional views of the illustrated embodiment, rotates by mounting a plurality of magnetic disks 1 stacked on a spindle 2 at predetermined intervals. A plurality of magnetic heads 3 for recording and reproducing information on the magnetic disk 1 are held by a plurality of magnetic head arms 7, and the arms 7 are held by a carriage 5. The carriage 5 performs a positioning operation by seeking the magnetic head 3 in the direction of arrow A. On the other hand, the spindle 2 carries its own weight in the direction of arrow B, and the directions A and B are perpendicular to each other.

Bearings 6 are provided at the upper and lower ends of the spindle 2 in order to maintain the accuracy of its rotational movement, and a radial spring 8 is provided between the outer ring of the lower bearing and the base plate 4, and a radial spring 8 is provided between the outer ring of the lower bearing and the base plate 4. bearing and base plate 4 by applying a load to
We are working to smooth out the gap between the two. In addition, the outer ring ζ of the lower bearing is pressed by the thrust valve 9, thereby removing looseness between the outer ring and the inner ring of the bearing.

If the temperature of the magnetic disk drive increases or the environmental temperature changes, the fitting conditions between the bearing and the bearing fitting hole of the base plate t will change due to differences in the thermal expansion coefficients of related parts, so the radial spring 8 will not be pushed. The pressure causes the spindle 2 to tilt, causing thermal off-track.

Thermal off I-rank in the seek direction (radial direction of the magnetic disk) of the magnetic head 3 causes a data error of about a few microns and becomes a problem.
Thermal off-track in the direction perpendicular to the seek direction (direction tangential to the circumference of the magnetic disk 1) has some margin compared to this. Therefore, it is desirable that the direction of inclination of the spindle 2 caused by a change in temperature be perpendicular to the seek direction of the magnetic head 3. Further, by matching the direction of the weight of the spindle 2 with the direction of the load of the radial spring 8, the load in the radial direction can be applied accurately. Therefore, as shown in FIG. 1, the direction of the weight of the spindle 2 and the radial spring 8
The carriage 5 is fixed on the base plate 4 at a position where the seek direction of the magnetic head 3 is perpendicular to the direction of the weight of the spindle 2.

〔Effect of the invention〕

As explained above, the magnetic disk drive of the present invention reduces the thermal off-track by fixing the carriage at a position where the seek direction of the magnetic head is perpendicular to the direction of the spindle's own weight, thereby accurately moving the magnetic head. This has the effect that positioning can be performed on the magnetic disk, and therefore a highly reliable magnetic disk device can be obtained.

Bindle, 313-...Magnetic head, 4.14-.
... Base plate, 515 ... Kia Ridge, 6
...Bearing, 7-17...Arm,
8... Radial spring, 9... Thrust spring.

Claims (1)

[Claims] 1. A spindle on which a plurality of magnetic disks are stacked at predetermined intervals, a plurality of magnetic heads provided corresponding to the recording surfaces of the plurality of magnetic disks, and the magnetic head. a plurality of arms that hold the plurality of arms; a carriage that holds the plurality of arms and positions the magnetic head in a designated cylinder of the magnetic disk; and the spindle and the carriage are mounted and fixed in a predetermined position. In a magnetic disk device comprising a base plate,
A magnetic disk drive characterized in that the seek direction of the magnetic head is perpendicular to the direction of the weight of the spindle. 2. A spindle that loads a plurality of magnetic disks at predetermined intervals, a plurality of magnetic heads provided corresponding to the recording surfaces of the plurality of magnetic disks, and a plurality of magnetic heads that hold the magnetic heads. A magnetic device comprising an arm, a carriage that holds the plurality of arms and positions the magnetic head on a designated cylinder of the magnetic disk, and a base plate that mounts the spindle and the carriage and fixes it in a predetermined position. In the disk device,
The direction of the dead weight of the spindle is perpendicular to the seek direction of the magnetic head, and the direction of the dead weight of the spindle and the loading direction of a radial spring that applies a load in the radial direction to a bearing that supports the rotational movement of the spindle. A magnetic disk device characterized by having the following.