JPH04298855A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent spacing between a magnetic head and a medium from generating without possibility to damage the medium in a magnetic recording and reproducing device recording or reproducing magnetically information by supporting to fix the magnetic head to an erastic supporting plate and pressing it with contact and sliding and bringing into contact with the magnetic recording medium. CONSTITUTION:This device is constituted so that by a structure forming long holes 16a-16d in the supporting plate 16, the magnetic head 2 is supported erastically and rockingably so as to incline from a parallel plane (the parallel plane to the supporting plate 16 in figure) to the medium and the magnetic head 2 is supported erastically and movably to the pressurizing direction pressing it with contact with the medium and to the opposite direction (the vertical direction in figure). Thus, force imparted to the magnetic head 2 to the vertical direction is absorbed or mitigated and the spacing is prevented effectively without damaging the medium.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording/reproducing device, and particularly to a magnetic recording/reproducing device in which a magnetic head is fixed and supported on an elastic support plate.
The present invention relates to a magnetic recording/reproducing device that magnetically records or reproduces information by pressing and slidingly contacting a magnetic recording medium.

0002

2. Description of the Related Art A device of this type is a floppy disk device (hereinafter referred to as a floppy disk device) which is used as an external storage device for information processing devices such as computers, and magnetically records or reproduces information on a flexible magnetic disk as a magnetic recording medium. FDD). In recent years, FDDs have been rapidly becoming smaller and larger in capacity, and accordingly higher recording density is required, and for this purpose it is advantageous to narrow the width of the magnetic gap of the magnetic head. It is known that this is a good method. However, when the gap width is narrowed, a change in the size of the gap (hereinafter referred to as spacing) between the magnetic recording medium (hereinafter referred to as medium) and the magnetic head appears as a large change in the output of the magnetic head. For this reason, the state of contact between the magnetic head and the medium is important, and it is necessary to stably keep the spacing small.

[0003] Against this backdrop, in conventional FDDs, a configuration as shown in the exploded perspective view of FIG. 3 is used as a magnetic head device consisting of two magnetic heads and a carriage for transporting the magnetic heads. In FIG. 3, a magnetic head device is constructed by fixing an upper magnetic head device 21 to a lower magnetic head device 20 with fixing screws 15. Reference numeral 7 indicates a medium (magnetic disk).

In the lower magnetic head device 20, reference numeral 8
A carriage for transporting the magnetic head is driven along the radial direction of the medium 7 (in the direction of arrows A and A') by a driving means (not shown). A first magnetic head 1 for recording and reproducing information on the lower surface of the medium 7 is supported and fixed on the upper surface of the leading end of the carriage 8 via a support plate 3. Further, a shield ring 5 for shielding noise from the magnetic head 1 is fixed to the support plate 3 so as to surround the magnetic head 1.

Further, a support member 13 of an upper magnetic head device 21 is fixed onto the carriage 8 by a fixing screw 15. The arm 9 is cantilevered to the support member 13 via a leaf spring 12 so as to be elastically displaceable in the vertical direction.
It is urged downward by a pressing spring 14.

A second magnetic head 2 for recording and reproducing information on the upper surface of the medium 7 is mounted on the lower surface of the tip of the arm 9 and has a gimbal, which is an elastic support plate whose peripheral edge is fixed to the arm 9. It is fixedly supported by the plate 4. The magnetic head 2 is arranged facing the magnetic head 1, and the arm 9
The upward position of the gimbal plate 4 is regulated by a pivot 10 provided on the gimbal plate 4.
It is supported so that it can swing due to its elasticity, that is, it can tilt from a plane parallel to the medium 7. Note that a shield ring 6 is fixed to the gimbal plate 4 so as to surround the magnetic head 2.

Next, the operation of this conventional example will be explained. During recording and reproduction, the pressing spring 14 presses the arm 9 downward, and this pressing force brings the magnetic heads 1 and 2 into pressure contact with the medium 7, and while the medium 7 is being held between them, the medium 7 is moved by an arrow B by a driving means (not shown). The magnetic heads 1 and 2 slide in contact with the medium 7 to perform recording or reproduction. Here, the magnetic heads 1 and 2 are an FPC (flexible printed circuit board) and an FPC (not shown), respectively.
It is connected to a recording/reproducing circuit (not shown) of the FDD via the PC 11, and input/output of recording signals or reproduction signals is performed between the circuit and the magnetic heads 1, 2.

According to the configuration of the conventional example as described above, during recording and reproduction, the magnetic heads 1 and 2 are brought into pressure contact with the medium 7 by the pressing force of the pressing spring 14, and the magnetic head 2 is brought into elastic contact with the medium 7 by the gimbal plate 4. The magnetic head 1 is supported so as to be swingable and follow the medium 7.
, 2 are placed in close contact with the medium 7 to suppress the occurrence of spacing.

[0009]

However, in the conventional configuration described above, the magnetic head 2 is swingably supported by the gimbal plate 4 so that it can be tilted from a plane parallel to the medium 7; It is not movably supported in the pressing direction in which it comes into pressure contact with 7 and in the opposite direction (vertical direction in the figure). The magnetic head 2 is a fixed magnetic head 1.
Therefore, if a force is generated in the opposite direction to the pressing direction due to non-uniform sliding friction between the magnetic head and the medium 7, the force will be directly generated as a magnetic reaction force against the pressing force. There is a problem in that the pressure acts directly on the head 2, thereby weakening the pressure and causing spacing.

In order to suppress the occurrence of spacing, there is a method of further increasing the pressing force of the magnetic heads 1 and 2 against the medium by the pressing spring 14, but if the pressing force is too strong, the medium 7 may be damaged.

Another method is to use the support plate 3 of the first magnetic head 1 as a gimbal plate so that the magnetic head 1 can also swing, but this would result in too large a swing, so the gap between the magnetic heads 1 and 2 would be too large. This causes another problem in that recording and reproduction are not performed at appropriate track positions.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in this type of magnetic recording/reproducing device, and to effectively prevent the occurrence of spacing between the magnetic head and the medium without damaging the medium. The purpose is to do so.

[0013]

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, in the above-mentioned type of magnetic recording/reproducing device, an elastic support plate supporting the magnetic head supports the magnetic head on a magnetic recording medium. It is configured to be elastically swingable so as to be tilted from a parallel plane, and to be elastically movably supported in the pressing direction in which the magnetic head is brought into contact with the medium and in the opposite direction.

[0014]

[Operation] According to such a structure, when a force in a direction opposite to the pressing direction is applied to the magnetic head during recording and reproduction, the force is elastically absorbed and buffered. Moreover, when the above-mentioned pressing force is strongly applied, the pressing force is relaxed.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the above-mentioned FDD magnetic head device will be taken as an example. In the apparatus of this embodiment, the structure of the elastic support plate that supports the upper magnetic head in the above-described configuration is different from that of the gimbal plate 4 of the conventional example, and its structure and operation will be explained below.

First, FIG. 1 is a perspective view showing the structure of a support plate 16 that supports the above magnetic head in an apparatus according to an embodiment of the present invention. The support plate 16 in FIG. 1 is made of elastic metal and has a rectangular shape. Four U-shaped elongated holes are formed in the support plate 16. First, a first elongated hole 16a is formed in parallel to three sides of the support plate 16, and a second elongated hole 16a is formed inside the first elongated hole 16a.
A long hole 16b is formed in the opposite direction to the long hole 16a, a third long hole 16c is formed inside the long hole 16c in a direction 90 degrees different from the long hole 16b, and a fourth long hole 16d is formed inside the third long hole 16c. 1
It is formed in the opposite direction to 6c.

A first cantilever portion 161 is provided between the elongated holes 16a and 16b, a second cantilever portion 162 is provided between the elongated holes 16b and 16c, and a third cantilever portion is provided between the elongated holes 16c and 16d. 1
63 is formed. Further, the magnetic head 2 and the shield ring 6 shown by dashed lines are fixed to a rectangular central portion 164 inside the elongated hole 16d. Cantilever portions 161 to 163
and the central portion 164 are elastically swingable about their respective proximal ends as fulcrums, whereby the magnetic head 2 is cantilevered multiple times in four directions that differ by 90 degrees within the plane of the support plate 16. It is supported so as to be swingable so as to be tilted from a plane parallel to the plate 16, and is movably supported in the vertical direction in the drawing perpendicular to the support plate 16.

Since the support plate 16 is made parallel to the medium during recording and reproduction, the magnetic head 2 can be elastically swung by the support plate 16 so as to be tilted from a plane parallel to the medium. It is supported to be elastically movable in the direction toward and away from the medium 7, that is, in the pressing direction in which the medium 7 is pressed by the pressing spring 14 shown in FIG. 3 and in the opposite direction.

According to this embodiment, when a force is generated in the opposite direction to the pressing direction of the magnetic head against the medium due to uneven sliding friction between the magnetic head and the medium during recording and reproduction, the magnetic head 2 Since it is elastically movable in the opposite direction to the pressing direction, it elastically absorbs the force in the opposite direction.
It is possible to effectively suppress the occurrence of spacing between the magnetic head and the medium. In addition, if the magnetic head presses too strongly against the medium, the pressing force is applied to the support plate 1.
6, it is also possible to prevent damage to the medium.

Note that the support plate 16 may be formed as shown in FIGS. 2(a) to 2(c) as another embodiment. In Figure 2 (
In a), there are two U-shaped long holes 1 in opposite directions in the support plate 16.
6a and 16b are formed, and the magnetic head is cantilevered only in two directions that differ by 180 degrees. This alone can be quite effective.

In addition, in FIG. 2(b), instead of the long holes 16a and 16b of the support plate 16 in FIG.
b', 16b' are formed. This is a mix of the conventional so-called gimbal structure and the cantilever-supported rocking structure of the above-described embodiment. According to this structure, higher effects can be obtained especially when the medium causes undulating vibration during recording and reproduction.

Furthermore, in FIG. 2(c), a pair of U-shaped long holes 16a', 16a' are formed in the support plate 16, facing each other at a narrow distance.
is formed, and a U-shaped long hole 16b is formed inside thereof,
Further, inside thereof, a U-shaped long hole 16c is formed in the opposite direction to the long hole 16b. Similar effects can also be obtained with such a structure.

In each of the above embodiments, the thickness of the support plate 16 and the size of the elongated hole 16a are determined by the thickness of the support plate 16 and the size of the elongated hole 16a in the opposite direction to the pressing direction of the magnetic head, which occurs due to non-uniform sliding friction during recording and reproduction as described above. It is set appropriately by considering the magnitude of the force (which varies depending on the sliding speed of the magnetic head and the medium).

Further, the structure related to the shape and arrangement of the holes in the support plate 16 is not limited to the above-mentioned structure, but the point is that the magnetic head can be elastically oscillated so as to be tilted from a plane parallel to the medium, and is also in pressure contact with the medium. Any material may be used as long as it is elastically movable in the pressing direction and the opposite direction.

[0025]

As is clear from the above description, according to the present invention, a magnetic head is fixed and supported on an elastic support plate, and the magnetic head is brought into pressure contact and sliding contact with a magnetic recording medium. In a magnetic recording/reproducing device that performs recording or reproduction,
The support plate is configured to be able to elastically swing the magnetic head so as to tilt it from a plane parallel to the medium, and to support the magnetic head to be elastically movable in a pressing direction in which the magnetic head is brought into pressure contact with the medium and in a direction opposite thereto. With this structure, when a force in the opposite direction to the pressing direction is applied to the magnetic head during recording and reproduction, the force is absorbed or buffered, and when the pressing force is too strong, the pressing force is relaxed, so that the medium is not damaged. Therefore, it is possible to effectively prevent the occurrence of spacing between the magnetic head and the medium, and the excellent effect of improving the recording and reproducing characteristics of the device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a support plate that supports a magnetic head in an FDD magnetic head device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a support plate according to another embodiment.

FIG. 3 is an exploded perspective view of a conventional FDD magnetic head device.

[Explanation of symbols]

1, 2 Magnetic head 3 Support plate 5, 6 Shield ring 8 Carriage 9 Arm 16a-16d Long hole 161-163 Cantilever section 164 Central part

Claims (1)

[Claims] 1. A magnetic recording/reproducing device in which a magnetic head is fixedly supported on an elastic support plate and magnetically records or reproduces information by bringing the magnetic head into pressure contact and sliding contact with a magnetic recording medium, wherein the support plate is The magnetic head is configured to be elastically swingable so as to be tilted from a plane parallel to the medium, and to be elastically movably supported in a pressing direction in which the magnetic head is brought into pressure contact with the medium and in a direction opposite thereto. Features of magnetic recording and reproducing device.