JPH0235682A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enable every part to be displaced in the same direction even when the temperature of a magnetic disk device changes and to prevent relative height between a magnetic disk and a magnetic head from being changed by aligning the pressing direction of a disk rotary shaft to that of a head rotary shaft. CONSTITUTION:The title device is provided with a rotary mechanism equipped with the disk rotary shaft 2 to support the magnetic disk 1 and a first pre-load spring 6a to press the disk rotary shaft 2 in an axial direction, and a rotary type carriage equipped with the head rotary shaft 13 to support the magnetic head 9a provided corresponding to the magnetic disk 1 and a second pre-load spring 6b to press the head rotary shaft 13 in the axial direction. Here, the first pre-load spring 6a and the second pre-load spring 6b are arranged so that the pressing direction of the disk rotary shaft 2 can be aligned to that of the head rotary shaft 13. In such a way, it is possible to prevent the relative height of the magnetic disk and the magnetic head from being changed even when thermal expansion is generated in every part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device in which a magnetic head reads required data from a rotating magnetic disk surface and writes it to the magnetic disk surface.

[Prior Art] In general, this type of magnetic disk device has a magnetic head mounted on a rotary carriage, and uses air pressure generated as the magnetic disk rotates at high speed to levitate the magnetic head through a minute gap to read and write magnetic records. Running.

The carriage of this magnetic disk device uses a servo head to read a positioning pattern written on a magnetic disk, and performs positioning by forming a servo loop.

In addition, this magnetic disk device is progressing in the direction of improving the Q density, but methods for improving this recording density include increasing the bit density of the track, and increasing the track density by reducing the track width. There is a method. Recently, this settling width has been reduced to about 20 μm.

In a conventional magnetic disk drive, as shown in FIG. 4, a magnetic disk 1 is rotatably supported on a substrate 3 at both ends of a disk rotating shaft 2 via a spindle hub 4 and bearings 5a and 5b. The bearing 5a is fixed to the substrate 3, while the bearing 5b
is slidably fitted into the bearing support portion 3a of the base plate 3, and is biased in a direction away from the bearing 5a by a first preload spring 6a for removing backlash. On the other hand, a magnetic head 9a corresponding to the magnetic disk 1 is supported by an arm 12a, a carriage 15 and a bearing 14a.

It is rotatably supported by the head rotation shaft 13 via the head rotation shaft 14b. The bearing 14a is slidably inserted into the bearing support portion 15a of the carriage 15, is spaced apart from the bearing 14b fixed to the carriage 15 by a second preload spring 6C for removing backlash, and is opposite to the disk rotation shaft 2. biased in the direction. The magnetic head 9a is rotationally driven by the torque generated by the magnetic circuit 17.

The magnetic head 9a is composed of a servo head 8 used for positioning and a data head 7 for reading and writing data.
and a data arm 10.

[Problems to be Solved by the Invention] By the way, with the spread of computers, the range of environmental temperatures in which they are installed has widened, and as a result, there may be a large difference in the environmental temperature between when writing and reading data. In such a case, due to the temperature expansion of each part of the device, the RAD 7 will shift relative to the data from the track positioned by the RAD 8 to the servo, which is one of the major causes of off-track and the inability to read information. There was a problem with that.

The reason for this is that in conventional magnetic disk drives, when the environmental temperature rises, the magnetic disk l is
．． Fixed side bearing 5 due to thermal expansion of magnetic disk primary material
arrow A according to the biasing force of the first preload spring 6a with reference to a.
move in the direction of

On the other hand, the magnetic head 9a moves in the direction of arrow B according to the biasing force of the second preload spring 6C with respect to the fixed side bearing 14b due to thermal expansion of the materials such as the arm 12a and the carriage 15.
In other words, the relative height of the magnetic disk 1 and the magnetic helad 9a varies greatly due to temperature changes. With this, the fifth
This is because, as shown in the figure, the head gimbal 18a attached to the magnetic head 9a tilts significantly, causing the magnetic head 9a to move to a different location than before the temperature change.

Therefore, the technical problem of the present invention is that even if each part thermally expands,
The purpose is to eliminate relative height changes between the magnetic disk and the magnetic head.

[Means for Solving the Problems] The present invention solves the above problems, and aims to provide a magnetic disk device that improves the relative misalignment between the servo head and the data head of the magnetic head due to temperature changes. , a rotation mechanism including a disk rotation shaft that supports a magnetic disk, a first preload spring that biases the disk rotation shaft in the axial direction, and a head rotation shaft that supports a magnetic head provided corresponding to the magnetic disk. and a rotary type carriage equipped with a second preload spring that biases the head rotation shaft in the axial direction, the first preload spring and the second preload spring are configured to axially bias the head rotation shaft. The biasing direction and the biasing direction of the head rotation shaft are arranged in the same direction.

[Embodiment] Hereinafter, a magnetic disk device according to an embodiment of the present invention will be described in detail based on the accompanying drawings. This magnetic disk device includes a rotation mechanism and a rotary carriage.

FIG. 1 shows a magnetic disk device according to a first embodiment. The rotation mechanism of this magnetic disk device includes a spindle hub 4 that supports a magnetic disk l. This spindle hub is fixed to a disk rotating shaft 2, and this disk rotating shaft 2 has bearings 5a mounted on a base plate 3 at both ends thereof.
, 5b. The bearing 5a is connected to the substrate 3
On the other hand, the bearing 5b is slidably inserted into the bearing support part 3a of the base plate 3, and is biased away from the bearing 5a by a first preload spring 6a loaded in the bearing support part 3a. has been done.

Further, the rotary type carriage is provided with a magnetic disk 9a provided corresponding to the magnetic disk 1. This magnetic helad 9a is supported by an arm 12a fixed to a carriage 15, and the carriage 15 has a bearing 14a on the head rotation shaft 13.

It is rotatably supported via 14b. Bearing 14a
is fixed to the carriage 15, while the bearing 14b is slidably inserted into the bearing support portion 15a of the gear ridge 15, and a second tension preload spring 6 provided on the outside of the bearing 14b
b in the direction away from the bearing 14a and in the same direction as the disk rotating shaft 2.

As described above, the magnetic head 9a includes the servo head 8 and the data head 7, and correspondingly, the arm 12a includes the servo arm 11 and the data arm 10.

Therefore, according to the magnetic disk device according to the first embodiment, when the temperature of the magnetic disk device rises, the magnetic disk 1 is moved to the spindle hub 4. Due to thermal expansion of the material of the magnetic disk 1, the magnetic disk moves in the direction of arrow A based on the fixed side bearing 5a according to the urging force of the first preload spring 6a.
On the other hand, the magnetic helad 9a also moves according to the biasing force of the second preload spring 6b based on the fixed side bearing 14a due to the remaining amount of the arm 12a, carriage 15, etc. In this case, the bearing 14b which is loaded with preload However, the head rotation axis 13
with respect to its axial direction, li! Since the disk rotating shaft 2 of the disk rotating mechanism is biased in the same direction, the magnetic helad 9a moves in the same direction as the arrow A. As a result, the relative relationship between the magnetic disk l and the magnetic helad 9a The height hardly changes even with temperature changes, ie, the off-track is also extremely small, and the problem of not being able to read information is solved.

FIGS. 2(a) and 2(b) show the preload spring load positions of the bearings of the rotating mechanism section and carriage section of the magnetic disk device according to the second embodiment. This is the first preload spring 6
A is a compression spring and is disposed inside the bearing 5b, while the second preload spring 6b is also a compression spring and is disposed inside the bearing 14b. Therefore, similarly to the first embodiment, the disk rotation shaft 2 and the head rotation shaft 13 are urged in the same direction, and the same operations and effects as described above are achieved.

FIGS. 3(a) and 3(b) show the preload spring load positions of the bearings of the rotating mechanism section and carriage section of the magnetic disk device according to the third embodiment. This allows the bearing 5a and the bearing 14a to slide, is biased by a first preload spring 6e made of a compression spring with the bearing 5a placed on the inside, and is biased by a second preload spring 6e made of a tension spring with the bearing 14a placed on the outside. Biased with preload spring 6f.

The disk rotation shaft 2 and head rotation shaft 13 are biased in the same direction.

[Effects of the Invention] As explained above, according to the present invention, the urging directions of the disk rotation axis and the head rotation axis are made to match, so even if the temperature of the magnetic disk device changes, each part is displaced in the same direction. Therefore, due to this.

The magnetic disk and the magnetic head are also displaced in the same direction, and there is almost no change in relative height between the magnetic disk and the magnetic head.As a result, off-track can be made extremely small, making it possible to read information. The effect is that it can be done reliably.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a magnetic disk device according to a first embodiment of the present invention, FIGS. 2(a), (b), and 3(a),
(b) is a schematic diagram showing the preload spring load positions of the rotation mechanism section and the bearing of the carriage section in the second and third embodiments of the present invention. FIG. 5
FIG. 2 is a diagram showing a relative height change between a magnetic disk and a magnetic head when there is a temperature change in a conventional magnetic disk device, and an off-track diagram of the magnetic head caused by the change. 1: Magnetic disk 2: Disk rotating shaft 3: Substrate 4 Spindle hub 5a, 5b: Bearing 6a, 6e: First preload spring: Second preload spring 6b, 6c, 6d, 6f 7: Data head 8: Servo Head 9a: Magnetic head 9b: Magnetic head IO after temperature change: Data arm ll: Servo arm 12a: Arm 12b: Magnetic head 13 after temperature change: Head rotation shafts 14a, 14b: Bearing 15: Carriage 16: Housing 17: Magnetic circuit 18a: Head gimbal 18b: Head gimbal after temperature change

Claims (1)

[Claims] A rotation mechanism including a disk rotating shaft that supports a magnetic disk, a first preload spring that biases the disk rotating shaft in the axial direction, and a magnetic head provided corresponding to the magnetic disk. In a magnetic disk drive having a rotary type carriage equipped with a head rotation shaft to support and a second preload spring that biases the head rotation shaft in the axial direction, the first preload spring and the second preload spring are A magnetic disk drive, characterized in that the disk rotating shaft is biased in the same direction as the head rotating shaft in the same direction.