JPS5948867A - Magnetic head device - Google Patents

Abstract

PURPOSE:To always keep a head in contact surely with a disk and to ensure the stable reading and writing of information, by suppressing the malformation of a spring within an allowable stress of the spring which shifts the head by a stopper. CONSTITUTION:A lower head 1a opposite to a disk 6 is held by a support arm 3 of a support mechanism 2 via a plate spring 7, etc. Stoppers 10a and 10b are unified with the arm 3 at a lower part to the head 1a. A moving range is limited down to a prescribed degree for a downward shift of the head 1a therefore the malformation of the spring 7 is suppressed within the range of an elasticity allowable stress. As a result, an assured contact is always kept between the head 1a and the disk 6. Accordingly, the stable writing and reading of information can be ensured.

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, 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.

Such heads Ia and lb 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 has a gimbal flexure 5.
This allows it to move over a relatively wide range in the vertical direction. In such a structure, the upper head 1b moves downward and contacts the disk 6 while the lower head 1a is in contact with the rotating disk 6. Due to this downward movement of the upper head 1b, the disk 6
And the lower head 1a moves somewhat downward in the seven directions. 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 return to their original positions and become 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 ia and lb of the above mechanism, head 1
It is possible to stably perform IJ-write of data on the disk 6 by buffering the impact caused when the disk 6 contacts the disk 6. By the way, as mentioned above, the conventional heads 7a, lb can be moved vertically with a sufficient degree of freedom by the operation of the sliding ring 4 or the leaf spring 7. For this reason, for example, het "la".

When attaching or detaching 1b, 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 sedge ring 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 lh and lb cannot be maintained.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and prevents the application of a force exceeding the allowable stress to the spring or plate spring that supports the head in a magnetic disk drive, thereby ensuring that the head is always firmly attached to the disk. Contact and lead data.

An object of the present invention is to provide a magnetic head device that can perform writing stably.

[Summary of the invention]

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

[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 structure (only necessary parts) of a magnetic head device according to the present invention.

In FIG. 3, (the lower head 1 is
3A shows a configuration in which the symbol a is held by the support arm 3 of the support mechanism 2 via the leaf spring 7. In this case, the support arms 3 are provided with support arms 10a and 10b below the lower head 1a.
It is installed in an integrated manner. This stone z410a, 1
0b limits 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 groove bottom, when the lower head 1a in contact with the disk 6 moves downward, that is, when downward force is applied, the leaf spring 7 also deforms downward due to the force (deformation amount). . The amount of deformation of this leaf spring 7 is 410 m as shown in FIG.

10b, it is restricted 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 “O” to the stoppers 10a and 1θb, 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 the 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 through a tin ring 4 with respect to the disk 6. Specifically, the upper head 1b is attached to the gimbal flexure 5, and the upper head 1b is attached to the gimbal flexure 5.
is held by the support arm 3 via a spring 4, so that it can move in the vertical direction.

In this case, as shown in FIG. 4, the stopper 10av
lOb is provided.

The stoppers 10a and 10b limit 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. In other words, the amount of deformation of the spring 4 is limited to a certain range.

Therefore, in this case as well, as in the case of Fig. 3 above,
The upper head 1b moves due to the downward force and the disk 6
When it comes into contact with , the sedge ring 4 also deforms downward. The amount of deformation of this spring 4 is limited within a certain range depending on 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. Thereby, 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 described in detail above, according to the present invention, in a magnetic disk drive, when the head moves up and down, the movement range is set so that the deformation of the spring or leaf spring, etc. 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 come into contact with the head, 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...
Disc, 7...plate spring, 1θa, lθb...stopper.

Claims (1)

[Claims] In a magnetic disk drive, there is a magnetic head that contacts the disk to read and write data, a spooling means that supports this magnetic head, and a spring means that controls the range of movement of the head when it moves up and down. A magnetic head device 0 characterized in that it is equipped with a support mechanism for the head having a strut or means for limiting the stress within the permissible stress of the spring means.