JPH0410275A - Cross gimbal and magnetic head supporting mechanism - Google Patents

Abstract

PURPOSE:To prevent a recording medium or a magnetic head from being damaged by stabilizing the posture of the magnetic head by suppressing the vibration of the magnetic head by distorting a gimbal in the vertical direction of the plate surface without providing any pivot. CONSTITUTION:The edges of cross gimbals 13 and 14 are fixed to a magnetic head supporting mechanism 16, and magnetic heads 11 and 12 are attached at positions including the intersected point of the crossed shafts of the gimbals 13 and 14. Then, the distortion amount of the cross gimbal when applying load to the magnetic heads 11 and 12 vertically to the faces of the cross gimbals 13 and 14 is defined as 0.1-5mum/g for the 0-face side cross gimbal 13 of a floppy disk 17 and as 3-35 mum/g for the one-face side cross gimbal 13 in proportion to the load. Thus, since the vibration of the magnetic heads 11 and 12 is suppressed by distorting the gimbals 13 and 14 in the vertical direction of the plate face without providing any pivot in the magnetic head supporting mechanism 16, the stable output can be obtained and the floppy disk 17 or the magnetic heads 11 and 12 can be prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism and gimbal spring for supporting a magnetic head used in a magnetic disk device.

(Prior Art) Floppy disk devices are widely used as external storage devices for small computers because they allow random access and are inexpensive, and their performance continues to improve as recording densities and There are two types of floppy disk drives: single-sided type, which uses only one side of the floppy disk, and double-sided type, which uses both sides of the floppy disk, but double-sided type is becoming more common as density increases. It has become a target.

In a double-sided floppy disk device, two magnetic heads (sliders) 11 are placed facing each other as shown in FIG.
and 12 sandwich the flexible magnetic disk 17, and in order to perform recording and reproduction on both sides, a gimbal mechanism (gimbal springs 13 and 14) is attached to the head support structure 16 to make it flexible, so that the head follows the disk. It has a structure.

A gimbal spring is made by cutting out a groove in a leaf spring so that a cross-shaped beam remains at the center of the head.

This gimbal is called a cross gimbal, and has a degree of freedom of movement around the axis in the rotational direction of the disk (rolling direction) and around the axis in the radial direction (pitching direction) with the head position as the center. Since the head is fixed at the intersection of the vibration axes in two directions, the head has two degrees of freedom: rolling vibration and pitching vibration, and the back side of the gimbal spring where the magnetic head is attached is part of the head support mechanism. It comes in contact with a hard pivot 15, which defines vertical distortion.

In addition, in order to achieve higher recording density in floppy disk devices, unlike the conventional longitudinal recording method in which recording is performed by magnetizing the magnetic material of the recording medium in the in-plane direction, A so-called perpendicular recording method has been developed in which information is recorded by magnetizing a magnetic material. Perpendicular recording type recording media are required to have magnetic properties that correspond to the hollow recording density, and thin-film type flexible magnetic recording media using Co-Cr alloy as the magnetic material are attracting attention and being used as recording media suitable for this purpose. ing.

[Problem to be solved by the invention]

In order to achieve high-density recording in perpendicular recording type floppy disk devices such as those mentioned above, in addition to improving the performance of the recording medium and magnetic head, in order to achieve high reliability, it is necessary to improve the performance of the disk/magnetic head interface. Control of friction and wear phenomena is necessary. That is, it is necessary to reduce the frictional force between the disk and the magnetic head, to keep their relative positions stable, and to maintain smooth running without damaging the disk.

Conventionally, sliders 11 and 12 for double-sided floppy disk drives have been in contact with a recording medium 17 on a flat surface (sliding surface), as shown in FIG. , the central portion is supported by a hard pivot 15 of a magnetic head support mechanism 16. The tip of the pivot 15 and the edge of the magnetic head support mechanism 16 are on the same plane, and the head sliders 11 and 12 are structured to easily rotate and vibrate around the contact point with the pivot 15. When the head sliders 11 and 12 vibrate greatly, not only is it impossible to obtain a stable output, but the sliders also damage the disk, causing damage to the head itself.

The purpose of the present invention is to solve the problem of the magnetic head of the conventional double-sided floppy disk device as described above, prevent damage to the recording medium and magnetic head by maintaining a stable posture, and provide high durability. An object of the present invention is to provide a cross gimbal and a magnetic head support mechanism for providing a magnetic head that realizes recording with high performance and high reliability.

[Means to solve the problem]

In the cross-shaped gimbal of the present invention, the edge of the gimbal is fixed to a magnetic head support mechanism, and when a load is applied perpendicularly to the cross-shaped gimbal, the amount of distortion of the gimbal spring is proportional to the load, and the amount of distortion on the zero side of the disk is 0. It is characterized in that it is 1 to 5 μm/g, and 3 to 35 μm/g for the first surface of the disk. At this time, the magnetic head support mechanism is not provided with a pivot, or is provided with an elastic pivot, which will be described later. Furthermore, the gimbals on the 0-plane side and the 1-plane side are made thicker on the 0-plane side so that the amount of distortion on the 0-plane side gimbal is always smaller. The material for the gimbal spring should have a Young's modulus of 5 x 10" to 20 x 10" N/m2.
It is desirable that

Further, the magnetic head support mechanism of the present invention is characterized in that a point corresponding to the magnetic head bonding position on the back surface of the magnetic head bonding surface of the gimbal is supported by a pivot made of an elastic material. Elastic rubber, helical spring, etc. are used as the pivot material.

[Effect]

In the present invention, the vibration of the head is suppressed by providing the pivot with elasticity or by not providing the pivot to distort the gimbal in the direction perpendicular to its plate surface. As a result, stable output can be obtained and fewer scratches occur on the head and recording medium.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 are cross-sectional views of the magnetic head support mechanism and the center position of the magnetic head according to an embodiment of the present invention. FIG. 1 shows an embodiment without a pivot, and FIG. 2 shows an embodiment with a pivot.

The configuration of the cross gimbal used in each of these embodiments is shown in FIG. As already explained, the cross gimbal is made by connecting the plate springs to the beams 8a, 8b, and 9 in a cross shape centered on the head position.
It is made by cutting out the grooves so that a and 9b remain. First, a U-shaped or semicircular groove is cut out so that the beams 9a and 9b remain in the rotational direction of the disk, and a U-shaped or semicircular groove is cut inside the groove so that the beams 8a and 8b remain in the radial direction of the disk. A circular groove is cut out. As the material for the gimbal spring, iron alloys such as stainless steel, or copper and copper alloys are used. A magnetic head is attached to the cross gimbal at an attachment position 6 indicated by a dotted line.

In FIG. 1 and FIG. 2, the first side gimbal 13
A magnetic head (slider) 11 is attached to the
A magnetic head (slider) 1 is installed on the side gimbal 14.
2 is attached, and the edges of the first side sub-shaped gimbal 13 and the O side cross gimbal 14 are fixed to the magnetic head support mechanism 16.

The cross gimbal is distorted by the load of the attached head, but in this example, the gimbal springs on the 0-side and 1-side sides are made of the same material, and the thickness of the 0-side gimbal 14 is twice that of the 1-side gimbal 13. By doing the above, the amount of distortion is made smaller on the zero plane side.

In the embodiment shown in FIG. 2, a pivot 15 made of elastic rubber is attached to the head support mechanism 16 so as to come into contact with the center position of the slider.
Indicated by Silicone rubber was used as the elastic rubber. When the head load is applied, the pivot 15, specifically the tip end portion 25 of the pivot that is in contact with the gimbal, contracts and the gimbal I
3 and I4 are distorted with pivot 15.

For the embodiments of FIGS. 1 and 2, the Young's modulus of the cross gimbal material, the length and thickness of beams 8a, 8b and 9a 9b (for one cross gimbal, beams 8a, 8b
, 9a and 9b are all the same length and thickness), measure the amount of distortion when a head load is applied, and pm
It is shown in Table 1 in units of /g. In Table 1, Examples 1 to 8 show the cases of the embodiment shown in FIG. 1, and Examples 9 to 16 show the cases of the embodiment shown in FIG. For comparison, examples in which the amount of strain was measured with a conventional hard pivot are shown in Comparative Examples 1 to 10.

Table 1 As is clear from Table 1, when a hard pivot is used (Comparative Examples 1 to 8), the strain amount is O, whereas in Examples 1 to 8, the strain amount is O.
8, the amount of distortion on the 0-side gimbal is 0.1 to 5.0 pm.
/g, the distortion amount of the 1st side gimbal is 3~35JJm/g
and Example 9 using a silicone rubber pivot
In 16, the distortion amount of the 0 side gimbal is 0.05 to 7.5
μm/g, the amount of distortion of the 1st side gimbal is 2.2 to 33μ
m/g.

The gimbals (equipped with magnetic heads) and head support mechanisms of Examples 1 to 16 and Comparative Examples 1 to 10 described above were incorporated into a floppy disk drive, and the vibration state of the head on the first side was measured using an optical displacement sensor. Examined. Is the magnetic head installed as shown in Figure 3? At 1f6, avoid the pivot (if a pivot is used) and move it to the center of the magnetic head (position 5a) in the longitudinal direction, and from there to the leading side.
The vibration amplitude at a point (position 5b) separated by mm was measured, and the results are shown in Table 2.

Further, a continuous running experiment was conducted, and the recording medium was taken out at regular intervals and the surface was observed under a microscope. Table 2 also shows the number of runs until scratches occurred.

As is clear from Table 2, the gimbal and magnetic head support mechanism according to the present invention suppressed head vibration and greatly improved the life of the recording medium.

[Effects of the Invention] As explained above, the present invention provides the following advantages:
Alternatively, by providing an elastic pivot, the gimbal is distorted by the head load, which suppresses pitching vibration, and the magnetic vent maintains a stable posture, preventing damage to the recording medium or magnetic head. Therefore, it is possible to provide a gimbal and a magnetic head support mechanism for a magnetic head that realizes highly durable and reliable recording and reproducing.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of the magnetic head support mechanism and the center position of the magnetic head according to an embodiment of the present invention, FIG. 3 is a diagram showing the shape of a cross gimbal, and FIG. 4 is a diagram showing a conventional FIG. 3 is a diagram showing a cross section of the magnetic head support mechanism and the center position of the magnetic head. 5a, 5b... Vibration measurement position 6... Magnetic head attachment position 7... Pivot position 11, 12... Magnetic head (slider) 13,
14... Cross gimbal 15... Pivot 16... Head support mechanism 17... Floppy disk

Claims (2)

[Claims] (1) Disk 0 side and disk 1 attached to the magnetic head support mechanism used in a double-sided magnetic disk device
For the cross gimbal on the surface side, fix the edge of the cross gimbal to the magnetic head support mechanism, attach the magnetic head at a position that includes the intersection of the cross axes of the cross gimbal, and place the magnetic head against the surface of the cross gimbal. The amount of distortion of the cross gimbal when a load is applied vertically is 0.1 to 5 μm/g for the cross gimbal on the disk 0 side and 3 to 35 μm/g for the cross gimbal on the disk 1 side in proportion to the load. A cross gimbal featuring (2) A magnetic head support mechanism used in a double-sided magnetic disk drive, characterized in that the back side of the cross gimbal where the magnetic head is attached is supported by a pivot made of an elastic material.