JPH0229565Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head support device for a double-sided floppy disk device.

Conventionally, a double-sided floppy disk device is known in which a magnetic head is brought into contact with both sides of a floppy disk (hereinafter simply referred to as a disk) via magnetic head support members.

The magnetic head support member generally includes a first magnetic head support member.
A gimbal spring 10 as shown in the figure is used. As is well known, the gimbal spring 10 is shaped like a line punched out of the center of a metal plate. That is, inside the base plate 1, a vertical swing plate 2 is supported by being bridged by horizontal bridges 1h, 1'h, and further inside this vertical swing plate 2, vertical bridges 2v, 2' are supported. The rocking plate 3 is supported by being bridged by v. And this rocking plate 3
A magnetic head H is fixed to the center of the head.

Here, the direction Y connecting the vertical bridges 2v and 2'v
-Y corresponds to the radial direction of the disk, and the direction XX connecting the lateral bridge dimensions 1h and 1'h corresponds to the so-called track direction perpendicular to the radial direction of the disk. Therefore, the horizontal bridges 1h, 1'h can be elastically bent so that the vertical swing plate 2 can swing freely in the direction Y-Y, and the vertical bridges 2v, 2'v can be bent elastically so that the vertical swing plate 2 can swing freely in the direction Y-Y. 3 can be elastically deflected so as to be swingable in the direction XX. Therefore, the magnetic head H on the swing plate 3 is swingable with respect to the base plate 1 in both the direction The magnetic head H can follow the deflection.

By the way, in the past, sufficient deflection performance has been given not only to the vertical bridges 2v and 2'v but also to the horizontal bridges 1h and 1'h. There is a problem in that the distance between the magnetic gap of the upper magnetic head and the magnetic gap of the lower magnetic head changes, resulting in track deviation.

That is, the pair of magnetic gaps, which are composed of a pair of upper and lower magnetic heads with a disk in between, are spaced apart to prevent mutual interference, and although it is desirable that this space be constant, the deflection characteristics of the lateral bridge Therefore, if the magnetic head is tilted in the radial direction, it becomes impossible to align the magnetic gap with the desired track.

Conventional techniques proposed to solve such problems include Japanese Patent Publication No. 43828/1983 and Japanese Patent Application Laid-open No. 58-43828.
There is a technology published in each publication of No. 139369.

The idea common to these techniques is that the base plate 1 and the vertical swing plate 2 shown in FIG. 1 are formed completely integrally, thereby eliminating the bending function provided by the horizontal bridges 1h and 1'h. Specifically, it corresponds to a gimbal spring as shown by the reference numeral 10' in FIG.

In this gimbal spring 10', the vertical bridge 2v,
2'v allows the magnetic head to swing only in the track direction, but not in the radial direction. Therefore, no track deviation occurs due to the gimbal spring as in the above example. However, it has been found that when this one-way gimbal spring is used, a new problem arises in that the modulation performance is degraded.

By the way, modulation is one of the characteristic values that expresses the degree of contact between the disk and the magnetic head, and is the value obtained by dividing the difference between the maximum signal amplitude and the minimum signal amplitude in the output waveform of the floppy disk by the sum (percentage). ). The standard is set at 10% or less.

In order to improve this modulation performance, it is sufficient to increase the contact pressure between the magnetic head and the magnetic disk, but if it is increased too much, the disk is likely to be damaged, resulting in a shortened service life.

SUMMARY OF THE INVENTION It is therefore an object of this invention to provide an improved magnetic head support device for a double-sided floppy disk device that does not cause track misalignment and can also improve modulation propensity.

In accordance with the above-mentioned purpose of this invention, the magnetic field of a double-sided floppy disk device is designed such that the deflection performance of the gimbal spring in the disk radial direction is set to a strength within a range that does not cause track deviation and does not deteriorate modulation performance. A head support device is provided.

The configuration of this invention will be explained below based on one embodiment.

Embodiment 1 (See FIG. 3) In the figure, a gimbal spring 1000 as a magnetic head support member has a general shape similar to the gimbal spring 10 shown in FIG. That is, the horizontal bridges 100h, 10
A vertical rocking plate 200 is supported by being bridged by 0'h, and furthermore, inside this vertical rocking plate 200,
The swing plate 300 is supported by being bridged by vertical bridges 200v and 200'v. A magnetic head H is fixed to the center of the swing plate 300.

Here, the horizontal bridges 100h and 100′h are
It has a function to control the rocking followability of the floppy disk in the radial direction Y-Y of the vertical rocking plate 200 and, ultimately, of the magnetic head H on the rocking plate 300. Further, the vertical bridges 200v and 200'v have a function of controlling the rocking followability of the magnetic head H on the rocking plate 300 in the track direction XX.

Therefore, we focused on the above functions and created a horizontal bridge 10.
The bridge length of 0h and 100'h is A, the bridge width is D, the bridge length of vertical bridge 200v and 200'v is B, and the bridge width is C.
In this example, the relationships B>A and C≦D are set when respectively expressed as .

Embodiment 2 (See FIG. 4) A gimbal spring 1001 as a magnetic head support member in this embodiment has a general shape similar to the gimbal spring 1000 shown in FIG. 3. Therefore, to avoid complexity, the names and symbols of each member will be the same as in the previous example.

In this example, the relationships A≦B and D>C are set.

Embodiment 3 (See FIG. 5) A gimbal spring 1002 as a magnetic head support member in this embodiment also has a general shape similar to the gimbal spring 1000 shown in FIG. 3.

Therefore, to avoid complexity, the names and symbols of each member will be the same as in the previous example.

In this example, the relationships are set as B>A and D<C.

In all three examples above, the vertical bridge 2
00v, 200′v and horizontal bridge 100h, 1
While maintaining the spring characteristics in the torsional direction due to 00'h, when comparing the spring forces of the two, the spring force of the horizontal bridges 100h and 100'h is the same as that of the vertical bridge 2.
The spring force is set to be stronger than the spring forces of 00v and 200'v. Therefore, a gimbal spring having such a structure is used as a magnetic head support member on at least one of the upper surface and the lower surface of the disk.

According to the present invention, the oscillation followability of the magnetic head in the radial direction of the floppy disk can be improved while keeping the oscillation followability of the magnetic head in the track direction to an appropriate level. It is possible to set the spring strength to an intermediate range that does not cause the contact with the media and maintains a good contact state with the media.

Therefore, a magnetic head support device is provided which is free from track deviation and has good modulation performance.

[Brief explanation of the drawing]

1 and 2 are front views of a conventional gimbal spring, and FIGS. 3 to 5 are front views of a gimbal spring as an embodiment of the present invention. 1000, 1001, 1002...Gimbal spring as a magnetic head support member, 100h, 10
0'h...Horizontal bridge, 200v, 200'v...
Vertical bridge.

Claims (1)

[Scope of Claim for Utility Model Registration] A magnetic head support device for a double-sided floppy disk device in which the magnetic heads are brought into contact with both sides of the floppy disk via magnetic head support members, each of the above-mentioned magnetic head supports Among the members, for at least one magnetic head support member, the vertical bridge dimension that governs the rocking followability of the magnetic head in the track direction orthogonal to the radial direction of the floppy disk, and the radial direction of the floppy disk. A double-sided floppy disk device characterized in that the lateral bridge dimension that governs the rocking followability is set so that the rocking followability of the latter is smaller than the rocking followability of the former. Magnetic head support device.