JPH0125158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic head device for a magnetic disk device.

[Technical background of the invention and its problems]

Generally, in a magnetic disk device such as a floppy disk device, a magnetic head (hereinafter simply referred to as a head) contacts a magnetic disk (hereinafter simply referred to as a disk) that stores data to read and write data. It will be done.

Such heads 1a, 1b are usually supported by a support mechanism 2 as shown in FIG. That is, both the upper head 1b and the lower head 1a are supported by the carriage 3 via the spring 4. Further, the upper head 1b can move over a relatively wide range in the vertical direction by means of a gimbal flexure 5. In such a structure, the upper head 1b is in contact with the rotating disk 6 while the lower head 1a is in contact with the rotating disk 6.
moves downward and contacts the disk 6. This downward movement of the upper head 1b causes the disk 6 and the lower head 1a to move downward somewhat. Immediately after this, due to the repulsive force of the spring 4 of the lower head 1a, the lower head 1a and the disk 6
returns to its original position and becomes stable. Note that FIG. 2 shows a case where a leaf spring 7 is used as the spring 4 that supports the lower head 1a, and the operation is the same as described above.

With the heads 1a and 1b of the mechanism as described above,
It buffers the shock caused when the head 1b contacts the disk 6, and reads data from the disk 6.
Lighting can be performed stably. by the way,
The conventional heads 1a and 1b as described above are designed to be able to move vertically with a sufficient degree of freedom by the action of a spring 4 or a leaf spring 7. For this reason, when attaching or detaching the heads 1a, 1b, for example, a deformation amount (external force) greater than the allowable stress may be applied to the spring 4 or the leaf spring 7. As a result, the spring 4 or the leaf spring 7 is deformed and cannot be restored to its original state, resulting in a drawback that the original dimensional accuracy with respect to the heads 1a, 1b cannot be maintained.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and is designed to prevent a force exceeding the allowable stress from being applied to the spring or leaf spring supporting the head in a magnetic disk device, thereby ensuring that the head is always firmly attached to the disk. An object of the present invention is to provide a magnetic head device that can stably read and write data through contact.

[Summary of the invention]

That is, in this invention, when the head supported by the spring means moves up and down, the head support mechanism is provided with a stopper that limits the range of movement within the allowable stress limit of the spring means.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 3 and 4 show the configuration (only necessary parts) of the floppy disk device according to the same embodiment. FIG. 3 shows a structure in which, for example, a lower head 1a with respect to a disk 6 is held by a support arm 3 of a support mechanism 2 via a leaf spring 7. In this case, the stoppers 10a and 10b are placed below the support arm 3 with respect to the lower head 1a.
It is provided in an integrated manner. This stopper 10
a and 10b limit the amount of deformation of the leaf spring 7, for example, so that when the lower head 1a moves downward, it stops within a predetermined movement range.

With such a configuration, when the lower head 1a in contact with the disk 6 moves downward, that is, when a downward force is applied, the leaf spring 7 also deforms downward due to the force (deformation amount). The amount of deformation of the leaf spring 7 is determined by the stoppers 10a and 10b as shown in FIG.
Therefore, it is limited within a certain range φ.
This range φ, that is, the distance from the position where the amount of deformation of the leaf spring 7 is approximately “0” to the stoppers 10a, 10b, is set to a value within the allowable stress limit of the leaf spring 7. Therefore, even if the leaf spring 7 is pressurized downward as described above, the leaf spring 7 will not be deformed beyond the allowable stress limit and will surely return to its original state by its repulsive force. As a result, the lower head 1a and the disk 6 can absorb downward impact and can reliably return to their original positions.

Next, FIG. 4 shows a case where the upper head 1b is held by the support arm 3 via the spring 4 with respect to the disk 6. Specifically, the upper head 1b is attached to the gimbal flexure 5,
This gimbal flexure 5 is held by the support arm 3 via a spring 4, so that it can move in the vertical direction. and,
In this case, as shown in FIG.
A stopper 10 is moved downward at a constant interval φ from
a and 10b are provided. This stopper 10a,
10b limits the movement distance of the gimbal flexure 5, for example, when the upper head 1b moves downward due to the operation of the spring 4 and the gimbal flexure 5. That is, the amount of deformation of the spring 4 is limited to a certain range.

Therefore, in this case as well, when the upper head 1b moves due to a downward force and comes into contact with the disk 6, the spring 4 also deforms downward. The amount of deformation of this spring 4 is limited within a certain range according to the movement range φ of the gimbal flexure 5 as described above. In this case, the range φ is set so that the amount of deformation of the spring 4 is within the allowable stress limit. Therefore,
Even when pressurized downward, the spring 4 never deforms beyond the allowable stress limit, and its repulsive force ensures that it returns to its original state. As a result, the upper head 1b and the disk 6 can absorb the downward impact and can reliably return to their original positions.

〔Effect of the invention〕

As detailed above, according to the present invention, in a magnetic disk device, when the head moves up and down, the movement range is set so that the deformation of the spring or leaf spring can be limited to within the limit of allowable stress. , it is possible to reliably prevent a force exceeding the allowable stress limit from being applied in one direction to a spring or a leaf spring. Therefore, the head can always be in reliable contact with the disk, and data can be read and written stably.

[Brief explanation of drawings]

1 and 2 are diagrams showing the configuration of a conventional magnetic head device, FIG. 3 is a diagram showing the configuration of a magnetic head device according to an embodiment of the present invention, and FIG. 4 is a diagram showing another embodiment of the present invention. 1 is a diagram showing the configuration of a magnetic head device according to an example. 1a, 1b...head, 3...support arm, 4...spring, 5...gimbal flexure, 6...disk, 7...plate spring, 10a, 10b...stopper.

Claims (1)

[Scope of Claims] 1. A magnetic head device used in a magnetic disk device, comprising: a magnetic head that contacts the disk to read and write data; supporting means that supports the magnetic head via spring means; A magnetic head device comprising stopper means for limiting the amount of deformation of the spring means within an allowable stress limit when the magnetic head moves to come into contact with or separate from the disk.