JPS6314368A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To suppress the change in the size between gaps and to attain high track density by mounting a magnetic head on the side 1 to a 2-axis gimbal plate and supporting the head by a pivot and fitting the magnetic head on the side O to the center of an elastic support plate whose surrounding is fixed to a carriage. CONSTITUTION:Since the elastic support plate 10 is thin and has no pivot, the elastic support plate 10 is deformed elastically in a concaved shape as shown in double-dotted chain lines in applying a force F to the magnetic head 4 in the depressing direction to sink the magnetic head 4, and when the force F is released, the plate 10 is restored to the original flat plate, and the elastic plate 10 is bent to enable the magnetic head 4 to be tilted somewhat. Thus, the tracking of the magnetic head 4 on the side O with respect to the magnetic disc 1 is improved. Since the elastic support plate 10 does not adopt gimbal structure, the magnetic head 4 tilted largely is limited and the quantity of change of the size X between the gaps attended with the change in the penetra tion is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head support device, and more particularly to a magnetic head support device in a magnetic disk storage device that records information on both sides of a flexible magnetic disk.

2. Description of the Related Art Various types of magnetic head support devices have been proposed in the past for double-sided recording type magnetic disk storage devices that record information on both sides of a flexible magnetic disk. Note that this type of magnetic head support device maintains the dimension of the gap between opposing magnetic heads in the magnetic disk radial direction (hereinafter referred to as the gear-to-gear dimension) even if the attachment status of the magnetic head to the magnetic disk changes. It is necessary that there be no change (the amount of change in the dimension between the gears is referred to as the amount of change in the dimension between the gears), and that the followability of the magnetic head to the magnetic disk is not impaired. This is because a change in the dimension between the gears results in off-track, and a decrease in followability results in a reproduction loss, both of which reduce the reproduction output. In particular, as the track density of recording becomes higher, it is required to suppress the amount of dimensional change between gears to several microns. Further, the above-mentioned device also needs to have a structure in which the magnetic disk and magnetic head are not easily worn out.

U.S. Pat. No. 4,151,573 discloses that a magnetic head that contacts side O of a flexible magnetic disk is completely fixed to a carriage, and a magnetic head that contacts side 1 is fixed to a biaxial gimbal plate on an arm. The configuration received with the pivot is shown. In this configuration, since the magnetic head on the side O side is completely fixed, the dimensional change m between the gears is good.

However, when the height position of the rotating surface of the magnetic disk changes due to dimensional errors in the disk rotation mechanism and disk cartridge, the magnetic head on the side O side cannot follow the magnetic disk, and the side O side The trackability of the side magnetic head is poor.

In order to improve this followability, the positional relationship between the magnetic head on the side O side and the magnetic disk is determined so that the magnetic disk is deformed into a convex shape and presses against the magnetic head. There is a problem that the magnetic head is easily worn out.

Furthermore, as shown in Japanese Patent Publication No. 58-43826, there is a device in which both the side O side and side 1 side magnetic heads are fixed to a two-axis gimbal plate and supported by a pivot. In this device, both magnetic heads can swing back and forth and left and right around the pivot, so the tracking performance of the magnetic head is improved without putting the magnetic disk and magnetic head in a state where they are prone to wear as described above. This makes it possible to improve trackability and wear compared to the above-mentioned devices. However, since the opposing magnetic heads both swing back and forth and left and right, the dimension between the gears is likely to change.

As an improvement to this device, the magnetic head on the side 1 side is attached to a biaxial gimbal plate and supported by a pivot in the same way as above, and the magnetic head on the side O side is a uniaxial gimbal plate that has a degree of freedom only in the circumferential direction of the magnetic disk. A device configured to be attached to a gimbal plate and received by a pivot was published in 1986-42.
No. 542. According to this configuration, since the magnetic head on the side 0 side can swing in the circumferential direction of the magnetic disk, the magnetic head can swing in the radial direction of the magnetic disk while maintaining good followability and wear resistance. By limiting the oscillation of υ1, it can be expected that the dimensional change m between the gears can be suppressed to a small value.

Problems to be Solved by the Invention Graph line a in FIG. 5 shows the measurement results of the dimensional change between the gear teeth when the penetration was changed in the above-mentioned apparatus. Penetration here refers to the state of contact between the magnetic head and the magnetic disk as shown in the figure, zero penetration is the state in which the magnetic head is in contact with the magnetic disk without bending it, and positive penetration is the state in which the magnetic head is in contact with the magnetic disk without bending it. A state in which the magnetic head on the side O side is pushing up the magnetic disk, and negative penetration refers to a state in which the magnetic head on the side 1 side is pushing down the magnetic disk. The penetration value is the dimension (μm) in which the magnetic head penetrates into the magnetic disk from the zero penetration position.

Penetration changes depending on the relative positions of the magnetic head and the magnetic disk in the axial direction of the magnetic disk.

From the graph line ■a above, the penetration is 1400~
In the range of +400μm, the dimension between gears is approximately 4μ
1, it can be seen that there is a relatively large change. This is because the force is lost on the weaker side of the -axis gimbal plate, causing the single-axis gimbal plate to swing in a direction that is tilted relative to its original rotational axis, which is the axis in the circumferential direction of the disk. It is thought that.

In addition, the above device has a penetration rate of 1400
The level of the output signal reproduced by the magnetic head on the side O side and the magnetic head on the side 1 side was measured while changing the magnetic head in the range of ~+400 μm.

Expressing this measurement result as a ratio to the recording level (hereinafter referred to as output level ratio), the output level ratio of the magnetic head on the side 0 side is the graph line Ira o in Figure 6, and the output level of the magnetic head on the side 1 side is The ratio is shown in graph line II in the figure.
[It will be as shown by a+. As can be seen from this, the output level of the magnetic head on the side O side was significantly reduced on the positive side of penetration, posing a problem in terms of performance.

This significant decrease in the output level is thought to be due to the fact that the magnetic head on the side O side takes pictures.

Note that when the above device is moved in the radial direction of the magnetic disk to perform recording and reproduction, the amount of dimensional change between the gears is as follows:
The output level ratio of the magnetic heads on the side O side and the side 1 side changes as shown by the graph line 11/a in FIG.

and VIa+.

SUMMARY OF THE INVENTION In view of the above-mentioned causes, it is an object of the present invention to provide a magnetic head support device that solves the above-mentioned problems.

Means for Solving the Problems In the magnetic head support device of the present invention, the magnetic head on the side 1 side is attached to a biaxial gimbal plate and supported by a pivot as in the conventional case, and the magnetic head on the side 0 side is supported by a pivot. , the periphery is attached to the center of an elastic support plate fixed to the carriage.

Since the acting elastic support plate does not have a gimbal structure, there is little change in the attitude of the magnetic head, which further suppresses the amount of dimensional change between gear teeth when penetration changes.

When the elastic support plate is pushed, it bends into a concave shape and returns to its original shape when the load is removed. This ensures the followability of the magnetic head on the side O side.

The elastic support plate limits vibrations caused by contact between the magnetic head on the side O side and the rotating magnetic disk, thereby improving the motion resistance of the magnetic head on the side O side. This side O side magnetic head has good photographic durability and a small change in posture, which improves the output level ratio. When the magnetic head on the side O side vibrates, the magnetic head on the side 1 side also vibrates due to this influence, and the output level ratio of the magnetic head on the side 1 side decreases, but the magnetic head on the side 0 side has good durability. The vibration property reduces the vibration of the magnetic head on the side 1 side and improves the output level ratio of the magnetic head on the side 1 side.

Embodiment Next, an embodiment of the magnetic head support device of the present invention will be described.

Figure 1 is an exploded perspective view of the main parts of the magnetic head support device;
The figure shows a side view.

Reference numeral 1 designates a flexible magnetic disk, whose central hub 2 is mounted on a turntable 3 and rotates in six directions indicated by arrows.

Reference numeral 4 designates a side 0 side magnetic head that contacts the side 0 side of the magnetic disk 1, and 5 represents a side 1 side magnetic head that contacts the side 1 side of the magnetic disk 1.

The side 1 side magnetic head 5 is attached to the lower center surface of a biaxial gimbal plate 7 whose periphery is bonded to an arm 6, and is supported by a pivot 8 so as to be able to swing in the circumferential direction and radial direction of the magnetic disk 1. It is possible to move. The biaxial gimbal plate 7 is made of beryllium copper or stainless steel, and has a thickness of 0.05 am.

The side O side magnetic head 4 is glued around the periphery to form an opening 9a.
It is attached to the upper center surface of the elastic support plate 10 which is fixed to the carriage 9 by covering it. The elastic support plate 10 is made of beryllium copper or stainless steel, and has a thickness of 0.08~0.
2jllI. There is no pivot for receiving this magnetic head 4.

The arm 6 is attached to the carriage 9 via a leaf spring 11. This arm 6 is biased in the direction of arrow B by a spring 12, and the magnetic head 4.5 is in contact with the magnetic disk 4. In this state, the carriage 9 moves in the radial direction of the magnetic disk 1 as shown by arrow C, and recording and reproduction are performed.

As shown enlarged in FIG. 3, in the magnetic heads 4 and 5, the distance between the respective R/W gaps 4a and 5a is a predetermined dimension x (for example, the dimension for 4 tracks) in the track alignment direction (disk radial direction). ) The positions are adjusted so that they are at odds with each other.

Next, support for the O-side magnetic head 4, which is a main part of the present invention, will be explained.

As mentioned above, since the elastic support plate 10 is thin and has no pivot, when a force F in the direction of pushing down the magnetic head 4 acts on the magnetic head 4 as shown in FIG. The magnetic head 4 is elastically deformed into a concave shape and sinks, and when the force F is removed, it returns to its original flat state. Further, the elastic support plate 10 is bent to allow the magnetic head 4 to tilt to some extent.

Thereby, the followability of the side oil head to the upper head air disk 1 is improved.

Further, since the elastic support plate 10 does not have a gimbal structure, it restricts the magnetic head 4 from tilting significantly. That is, the magnetic head 4 is displaced up and down while maintaining the posture shown by the solid line in FIG. This makes it possible to reduce the amount of change in the gear-to-gear dimension X due to changes in penetration.

Further, due to its strength, the elastic support plate 10 supports the magnetic head 4.
functions to suppress vibration.

When the imaging of the magnetic head 4 is suppressed, the magnetic head 5 is also not affected by vibrations.

4. The magnetic head can reduce the amount of dimensional change between the gears.
By suppressing the vibration of 5, each magnetic head 4.5
Both the output level ratios of the reproduced signals are improved.

Further, the deformation of the elastic support plate 10 shown in FIG. 4 exhibits a damper effect to absorb shocks caused by head loading, etc., and improves the wear resistance of the magnetic disk 1 and the magnetic head 4. In addition,
The material and thickness of the elastic support plate 10 are determined so that plastic deformation does not occur due to impact such as head load.

Note that the two-axis gimbal plate 7 and the pivot 8 function in the same manner as before.

Next, the characteristics of the above device will be explained.

FIG. 5 shows the relationship between the penetration of the magnetic head and the amount of dimensional change between the gears. With the above device, the measurement results shown in the graph line were obtained. As you can see,
Penetration of magnetic head is 1400~+400μ
In the range of m, the amount of dimensional change between carriages is about 2 μm, which is about 1/2 of the conventional value. This is because the attitude of the magnetic head 4 does not change.

FIG. 6 shows the relationship between the penetration of the magnetic head and the output level ratio. The output level ratio of the magnetic disk 4 was the measurement result shown by the graph line IIo, and the output level ratio of the Wiki disk 5 was the measurement result shown by the graph line I[[+.

As can be seen from the figure, the output level ratio of the side 0 side magnetic head 4 in the vicinity of penetration +400μ has been significantly improved, and the output level ratio of each magnetic head 4.5 is overall higher than that of the conventional one. It has been improved. This is because, firstly, the vibration of the magnetic head 4 is suppressed by the elastic support plate 10, and accordingly, the magnetic head 5 does not move, and secondly, as mentioned above, the dimensional change between the gears is This is because it is small.

Next, a description will be given of the characteristics when the carriage 9 is moved in the direction of arrow C and the magnetic head 4.5 is moved from the outer circumference to the inner circumference of the magnetic disk 1, that is, during actual recording and reproduction.

FIG. 7 shows the amount of dimensional change between gears, and FIG. 8 shows the output level ratio.

FIGS. 9A, 9B, and 9C show states when the central outer circumferential side and the inner circumferential side of the magnetic disk are reproduced, respectively. The magnetic disk 1 rotates with the outer circumferential side slightly lower than the inner circumferential side, and if the penetration of the magnetic head is zero at the center, the penetration of the magnetic head is positive on the outer circumferential side and negative on the inner circumferential side.

The amount of dimensional change between the gears is as shown by graph line IV in FIG. 7, and is suppressed to about 1/3 of that in the conventional case.

Due to the rigidity of the elastic support plate 10, the magnetic head 4 moves between the inner and outer peripheries of the magnetic disk while maintaining a horizontal position as shown in FIGS. This is because the head 4 pushes up the magnetic disk 1 and the amount of change in the height of the magnetic head 4 is also small.

Since the amount of dimensional change between the gears is smaller than that of the conventional device, the device of the present invention is useful in realizing a high track density recording/reproducing device.

The output level ratio of the magnetic head 4 became as shown by the graph line V in FIG. 8, and the output level ratio of the magnetic head 5 became as shown by the graph line ■ in the figure. As you can see from this,
The reproduction level ratio is improved for both the side 0 side and the side 1 side compared to the conventional one.This is because the elastic support plate 10 allows the magnetic head 4. Furthermore, the vibration of the magnetic head 5 is suppressed and the amount of dimensional change between the gears is small.

Moreover, a notch for adjusting elasticity may be formed in the elastic support plate 10, if necessary.

Further, the shape of the elastic support plate 10 is not limited to a circle, but may be, for example, a square.

Effects of the Invention As described above, according to the present invention, the magnetic head that contacts side 0 of the flexible magnetic disk is mounted at the center of the elastic support plate whose periphery is fixed to the carriage and can be bent in a direction perpendicular to the surface. The magnetic head that contacts side 1 of the flexible magnetic disk is attached to the center of a biaxial gimbal plate fixed to an arm provided on a carriage and received by a pivot, so it has the following features. .

('l) Due to its rigidity, the elastic support plate limits the free change in the attitude of the side 0 side magnetic head, so when the penetration of the magnetic head changes, the dimension between the gears changes and the opening becomes smaller than before. It can be suppressed. This is useful in achieving high track density.

(2) The elastic support plate limits vibration of the side 0 magnetic head due to its rigidity. Since the vibration of the side O magnetic head is limited, the vibration of the side 1 magnetic head, which is affected by this magnetic head, is also reduced. This, together with the ability to reduce the amount of dimensional change between the gears, can improve the output level ratio of each magnetic head.

(2) Due to the flexibility of the elastic support plate, the followability of the side 0 side magnetic head can be improved.

G4) The flexibility of the elastic support plate can absorb shocks such as head load, and can improve the wear resistance of the magnetic disk and the side O side magnetic head.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of an embodiment of the magnetic head support device according to the present invention, FIG. 2 is a side view thereof, and FIG.
FIG. 4 is an enlarged view showing the positional relationship between the upper and lower magnetic heads in the figure. FIG. 4 is a view showing the state of deflection of the elastic support plate. FIG. Figure 6 shows the change in the output level ratio with respect to the penetration of the magnetic head, and Figure 7 shows the change in the amount of dimensional change between the gears when the magnetic head plays back a flexible magnetic disk over the inner and outer circumferences. Figures 8 and 8 are diagrams showing changes in the output level ratio of each magnetic head when the magnetic heads reproduce data from the inner and outer circumferences of a replaceable magnetic disk, and Figures 9 (A), (B), and (C) ) is a diagram showing the contact state of the magnetic head to the magnetic disk when the magnetic head is respectively reproducing the center, outer circumference, and inner circumference of the flexible magnetic disk. DESCRIPTION OF SYMBOLS 1... Flexible magnetic disk, 3... Turntable, 4... Side 0 side magnetic head, 4a, 5a...R
/W gap, 5...Side 1 side magnetic head, 6...
・Arm, 7... Biaxial gimbal plate, 8... Pivot, 9... Carriage, 9a... Opening, 10.
... Elastic support plate, 11... Leaf spring, 12... Spring. Figure 2 and Figure 3

Claims (2)

[Claims] (1) In a magnetic head support device that brings magnetic heads into contact with both sides of a flexible magnetic disk, the magnetic head that contacts the side 0 side of the flexible magnetic disk is fixed around the periphery to a carriage in a direction perpendicular to the surface. A magnetic head, which is attached to the center of an elastic support plate that can be bent, and which contacts side 1 of the flexible magnetic disk, is attached to the center of a two-axis gimbal plate that is fixed to an arm provided on the carriage, and is supported by a pivot. A magnetic head support device characterized by having the following configuration. (2) The elastic support plate has a thickness of 0.08 to 0.2 mm.
2. The magnetic head support device according to claim 1, wherein the magnetic head support device is a plate made of beryllium copper or stainless steel.