JPH0386982A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To apply fixed bias force to a carriage in a small setting space by banding a leaf spring, for which one end is fixed to the prescribed position of the carriage and the other end is fixed to a prescribed fixed part, near the rotational center of an actuator. CONSTITUTION:Since one end of a leaf spring 80 is fixed to a carriage 40 and the other end is fixed to the prescribed fixed part, the bias force is always applied to the carriage 40 by restoring force for the bend of the leaf spring 80. Since the rotation driving force of the carriage 40 is interrupted by an actuator 50 when the rotation of a magnetic recording disk is stopped, the carriage 40 is rotationally operated so that a magnetic head 30 can be moved to a shipping area on the magnetic recording disk by the restoring force of this leaf spring 80. Thus, since the retract of the magnetic head 30 is executed by the leaf spring 80, the setting space is not required so much and the fixed bias force can be always applied to the carriage 40.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk drive, and more particularly to a method for retracting a magnetic head with respect to a magnetic recording disk in a magnetic disk drive equipped with a rotary actuator.

[Conventional technology]

Conventionally, various methods have been devised for moving the magnetic head to a portion of the magnetic recording disk where data is not recorded, such as a shipping area, when the rotation of the magnetic recording disk in a magnetic disk device stops.

Normally, when the magnetic recording disk is rotating and the magnetic head is reading/writing data, the magnetic head is not in contact with the magnetic recording disk and floats slightly due to the air flow caused by the rotation. There is. However, when the magnetic recording disk stops rotating, no airflow is generated, the magnetic head does not fly, and the magnetic head and magnetic recording disk come into contact. If this contact occurs in the data area, there is a risk of destroying the recorded data. Therefore, when the rotation of the magnetic recording disk stops, it is necessary to move the magnetic head to the shipping area (ie, a retract operation). As a conventional technique related to this, for example, as described in Japanese Patent Application Laid-Open No. 61-269275, a unidirectional force is applied to an actuator by the tension of a spring, thereby moving a magnetic head to a predetermined position on a magnetic recording disk. There is something to move.

Further, Japanese Patent Application Laid-Open No. 63-23283 discloses that a magnetic head is moved to a predetermined position on a magnetic disk by the restoring force of a flexible printed circuit board (FPC).

[Problem to be solved by the invention]

According to the above-mentioned conventional technology, for example, the technology in which the magnetic head is moved to a predetermined position using a spring spring, there is the hassle of installing the spring spring in a narrow installation space inside a small magnetic disk, and the number of parts increases. There is a problem.

Furthermore, there is a problem in that the carriage vibrates due to the compression wave vibration of the spring spring, and furthermore, the spring breaks due to the vibration of the carriage.

In addition, according to the latter conventional technology in which a magnetic head is moved to a predetermined position on a magnetic disk using an FPC,
Although it has the advantage of not increasing the number of parts, FP
Fatigue occurs due to repeated bending of C, which may cause damage to the FPC.

Further, since the FPC is made of resin, its restoring force weakens as it is repeatedly bent, and there is a problem in that it is not possible to provide a constant pie spacing to the carriage.

An object of the present invention is to provide a system that can always maintain a constant pie spacing in a relatively small installation space. An object of the present invention is to provide a magnetic disk device having a tract structure similar to that provided in Nodge.

[Means to solve the problem]

In order to achieve the above object, a leaf spring is provided with one end fixed to a predetermined position of the carriage and the other end fixed to a predetermined fixed part, and this leaf spring is bent near the rotation center of the actuator. It is something.

In addition, in order to reduce fatigue caused by repeated bending of the leaf spring, the normal line of the leaf spring fixed to the carriage at the point where it contacts the carriage is directed approximately toward the center of rotation of the rotary actuator. Define contact points.

[Effect]

Since one end of the leaf spring is fixed to the carriage and the other end is fixed to a predetermined fixed part, the carriage is always given a bias due to the restoring force of the bending of the leaf spring. When the rotation of the magnetic recording disk stops, the power to the rotating part of the carriage by the actuator is cut off, so the restoring force of this leaf spring causes the carriage to rotate so as to move the magnetic head to the shipping area on the magnetic recording disk. . As a result, the magnetic head is always in the shipping area when the rotation of the magnetic recording disk stops, thereby preventing damage to the data area.

Further, as described above, both ends of the leaf spring are fixed, and since the carriage and the leaf spring and the base and the leaf spring do not slide due to movement of the carriage, there is no problem of dust generation.

Furthermore, since the contact point was determined so that the normal line to the leaf spring at the point where the leaf spring fixed to the carriage contacts the carriage is approximately directed toward the rotation center of the rotary actuator, this allows the bending part of the leaf spring to bend. This reduces the degree of bending and prevents fatigue of the leaf spring due to repeated bending.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 is a configuration diagram of a magnetic disk device equipped with a leaf spring according to the present invention.

The magnetic disk device 1 includes a magnetic recording disk 10 for magnetically recording data. A spindle motor 20 rotates this at a constant speed. A magnetic head 30 that writes/writes data to/from the magnetic recording disk 10. Kise ridge 40 for supporting the magnetic head 30. A rotary actuator 50 that rotates the carriage 40 and positions the magnetic head 30 on the magnetic recording disk 10 for data writing/writing. FPC 60 and fixed plate 61 for transmitting signals from the magnetic head 30 to the circuit section. magnetic head 30
when the magnetic recording disk 10 stops rotating.

A leaf spring 80 for moving to the shipping area 100 where data is not recorded. and a base 70 on which these are mounted.

During operation of the magnetic disk device 1, the magnetic head 3° reads/writes data while slightly floating within the data area 101 of the magnetic recording disk 1o. When the operation of the magnetic disk device 1 stops, the magnetic head 30 comes into contact with the magnetic recording disk 10 and stops while sliding. At this time,
By bending and installing a leaf spring 80 between the carriage 40 and the fixed plate 61, the leaf spring 80 pushes the carriage 40 so that the magnetic head 30 moves to the shipping area 100. Also, one end of the leaf spring 80 is attached to a screw 8.
2 to the carriage 40, and the other end is fixed to the fixing plate 61 with screws 81. Therefore, due to the rotational movement of the carriage 40, the carriage 40 and the leaf spring 80
Since no sliding occurs, it is possible to prevent one dust from being generated. Also, in order to prevent the magnetic head 30 from passing through the shipping area 100 and going further inside, a stopper 8 is provided.
3 will be provided.

FIG. 2 is a diagram showing the state of the leaf spring 80 attached to the fixed plate 61.

Since the leaf spring 80 changes from its initial state (dotted chain line) to a bent state (solid line), it acts as a restoring force to move the magnetic head 30 attached to the carriage 40 to the shipping area 100 of the magnetic recording disk 10. A force acts.

FIG. 3 is a diagram showing a carriage according to an embodiment of the present invention.

The leaf spring 80 has one end fixed to the carriage 40 with a screw 82, and the other end fixed to the fixed plate 61 with a screw 81.

Regarding attaching the leaf spring 80 to the carriage 40,
As shown in FIG. 3, by mounting the leaf spring 80 so that the normal line to the length direction of the leaf spring 80 at the point of contact with the carriage 40 is approximately directed toward the center of rotation of the rotary actuator, the leaf spring 80 can be The radius of curvature R of the bent portion is approximately the same no matter where the magnetic head 30 is located within the data area 101. Inverter and leaf spring 80
Since the degree of bending due to repeated bending is reduced, the fatigue life of the leaf spring 80 can be made sufficiently long.

〔Effect of the invention〕

According to the present invention, since the magnetic head is tracted by a plate spring, it does not take up much installation space.

A constant pie spacing can always be applied to the carriage. Furthermore, the life can be extended compared to the conventional retraction using FPC.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic disk drive showing an embodiment of the present invention, FIG. 2 is a diagram showing the state of the spring in FIG. 1, and FIG. 3 is a diagram of the carrier in FIG. 1. 10...Magnetic recording disk. 20... Spindle motor, 30... Head, 40... Carriage, 70... Base, 80... Leaf spring, 81.82... Screw. The ridge indicating the ridge The center of the second meeting of the second flash

Claims (1)

[Claims] 1. A rotatably supported magnetic recording disk for recording data, a magnetic head for writing and reading data to and from the magnetic recording disk, and a magnetic head for supporting the magnetic head. A magnetic disk drive comprising a carriage and an actuator that rotationally drives the carriage to move the magnetic head supported by the carriage to a desired position on the magnetic recording disk, wherein one end is placed at a predetermined position on the carriage. A magnetic disk drive characterized in that a plate spring is fixed and the other end is fixed to a predetermined fixing part, and the plate spring is bent near the center of rotation of an actuator. 2. In the description of claim 1, the normal to the length direction of the leaf spring at the contact point between the leaf spring and the carriage on the side closer to the bent portion of the leaf spring is approximately in the direction of the rotation center of the carriage. A magnetic disk device characterized in that the plate spring and the carriage are fixed so as to face each other.