JPS62226472A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To reduce the pressing force of a pressing pad and to improve the durability of a magnetic head and that of a disk by confronting a hollow part installed in the center of the pressing pad with the gap part of the magnetic head and arranging the hollow part. CONSTITUTION:The pressing pad 6 has the hollow 5 in its center, and the hollow part 5 is arranged so as to be confronted with the recording and reproducing gap 1a and the erasure gap 1b of the magnetic head 1, and pressurizes a flexible magnetic disk FD 2. By bending the FD 2 in such a way the contact of the FD 2 with the head 1, which is caused by the elasticity of the FD 2 itself, is utilized, whereby the pressing force of the pad 6 is reduced to improve the durability of the head 1 and that of the FD 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an auxiliary storage device for an electronic computer, and particularly to a magnetic recording device using a flexible magnetic disk.

(Prior Art) In recent years, with the miniaturization and increase in capacity of electronic computers, magnetic recording devices (floppy disk drives) that drive flexible magnetic disks (floppy disks; hereinafter referred to as FD), which are one of the auxiliary storage devices, have become popular. ; hereinafter referred to as ri'DD), there is also a demand for miniaturization and larger capacity, as well as long life and high reliability of the magnetic heads mounted on l''Ds and FDDs.

By the way, the king of FDs, magnetic heads, and pressing pads presses the FD with a pad so as to bring it into close contact with the gap of the magnetic head in order to perform highly efficient electromagnetic conversion. Therefore, the greater the pressing force, the more likely the holder will wear out, which is a disadvantage in terms of extending the lifespan and high reliability of FDs and FDDs.

As these prior art, for example, Utility Model Application Publication No. 60-770
No. 68 and Utility Model Application Publication No. 60-77069 are known.

An example of an FDD equipped with a conventional FD pressing pad will be described below with reference to the drawings.

FIG. 7 shows the configuration of an FDD to which the present invention is applied, and FIG. 8 is a schematic diagram of an FD cartridge used in the FDD shown in FIG. It shows the arrangement. Further, FIG. 9 shows a conventional pressing pad (made of felt material), which is arranged so as to face the magnetic head 1 and press down the r/D 2, as shown in FIG.

The operation of the FDD configured as above will be explained below. FD2 is normally 300 by the drive motor 14.
The magnetic head 1 and the pressing pad 6 are driven at a rotation speed of RPM, and the carriage 8 randomly accesses the FD 2 from the outer circumference to the inner circumference as a unit. FIG. 10 is a diagram showing a state in which the conventional FD pressing pad 6 shown in FIG. 9 presses the FD 2. Gap part 1
Recording, reproduction, and erasing are performed by pressing the FD 2 against the gaps 1b and 1b.

At this time, in order to minimize the separation length between the magnetic head 1 and the FD 2, it was necessary to increase the pressing force of the pressing pad 6 as much as possible. The pad pressing load is normally set to about 20 g. In FIG. 8, 4 is a liner, and in FIG. 10, 16 is a recording track.

(Problem to be solved by the invention) However, in the above configuration, when the FD rotates, the F
This has the disadvantage that the frictional force between D2 and the magnetic head 1 increases, causing wear of the magnetic layers of the magnetic head 1 and FD2, thereby shortening the life of the FD and the magnetic head. Specifically, sliding scratches occur on the surfaces of FDs and magnetic heads, and these scratches cause deterioration of electromagnetic conversion characteristics and erroneous signals. Furthermore, when the pressing force becomes large, the pressing pad deforms during long-term use, resulting in uneven pressing force and deterioration of electromagnetic conversion characteristics. In addition, reducing the pressing force to reduce wear on the FD and magnetic head will extend the life of both, but due to the generation of a separation length, the electromagnetic conversion characteristics will deteriorate, such as a decrease in the reproduction output of the magnetic head and an increase in modulation. It had the disadvantage that it decreased. In the case of conventional pressure pads, the life of the FD is usually about 5 million passes (1
continuous use of trucks).

In view of the above problems, the present invention provides an FDD equipped with a pressing pad that makes it possible to improve the durability of the magnetic head and FD by reducing the pressing force of the pressing pad.
It provides:

(Means for Solving the Problems) In order to solve the second problem, the present invention provides a cavity or a concave recess in the center of the pressing pad, and the cavity or recess is connected to the gap of the magnetic head. The FD is pressed against the FD.

Further, in the present invention, the pressure pad is tilted by making the thickness of the pressure pad slope or by tilting the holding part of the pressure pad, and the lowest point of the pressure pad due to the slope is set to the FD of the magnetic head. It is located on the approach side.

(Function) With the above configuration, the present invention utilizes the contact between the FD and the magnetic head due to the elastic force of the FD itself by pressing and bending the FD instead of using the pressing force of the pressing pad. can be made smaller, and the durability of the magnetic head and FD can be greatly improved. Furthermore, the separation length between the FD and the magnetic head can be made smaller.

There is no deterioration in electromagnetic conversion characteristics.

(Example) Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 7 shows an FDD to which the present invention is applied, as described above.
This is what is shown. In the following embodiments, members having the same names as those in the conventional example will be described with the same reference numerals.

In FIG. 7, 1 is a magnetic head, 2 is FIG), 6
is a pressing pad; 7 is an arm that holds the pressing pad; the magnetic head 1 and the pressing pad 6 are held integrally with a carriage 8, and are accessed in the X direction. Further, the pressing pad 6 presses the FD 2 against the magnetic head 1 with a pressing load of 7 g.

FIG. 1 shows a pressure pad in a first embodiment of the present invention. Further, FIG. 2 shows a state in which the pressing pad 6 presses the FD 2 against the magnetic head 1. The pressure pad 6 has a cavity 5 in the center, and this cavity 5
is arranged so as to face the recording/reproducing gap portion 1a and the erasing gap portion 1b of the magnetic head 1, and presses the FD 2.

As shown in FIG. 2, the FD 2 is pressed and bent along the spherical surface of the magnetic head 1 by the pressing pad 6, and the FD 2 comes into close contact with the gap part of the magnetic head 1 due to its elastic force, allowing recording, reproducing, and recording. Erasure is performed.

In the pressing pad shape of this example, the pad pressing load is 3
I investigated the playback output and modulation of the magnetic head by changing it from g to 25g. As a result, Figures 11 and 1
As shown in Figure 2, the pad pressing load is from 3g to 10g.
However, it turned out that the playback output was sufficiently high and the modulation was small. On the other hand, in the case of this embodiment, the playback output actually decreases with a pressing load of 10 g or more, but this is because when the pressing load increases, the pressing pad 6
This is because the frictional force between the magnetic head 1 and the magnetic head 1 increases, and the FD floats up into the cavity 5 of the pressing pad, increasing the length by one separation. This shows a behavior that is very different from the relationship between the pad pressing load and the playback output in the conventional example.

As described above, according to this embodiment, by providing the cavity 5 in the center of the pressing pad, the pressing load can be reduced from 5 g to Log.
Since it becomes possible to reduce the size to a certain extent, the durability of the FD can be greatly improved to 20 million to 30 million passes (continuous use of one track). Note that the durability of the conventional example is about 5 million passes.

FIG. 3 shows a pressure pad according to a second embodiment of the present invention. Further, FIG. 5 shows a modified embodiment in which the rectangular pressure pad of FIG. 3 is transformed into a trapezoid, but a cavity 5 is provided in the center of the pressure pad 6 as in the first embodiment. As a result, the pad pressing load can be reduced, and the durability of the FD can be greatly improved.

FIG. 4 shows a pressure pad according to a third embodiment of the present invention. In FIG. 4, 5a is a spherical depression provided in the pressure pad 6. In the case of this embodiment as well, the first. Exactly the same effect as the second example was obtained.

FIG. 6 shows a state in which a magnetic head is pressed by a pressing pad according to a fourth embodiment of the present invention. In this embodiment, a pressure pad having the same shape as that shown in FIG. 1 is used, but differs from the embodiment shown in FIG. 1 in that the holding arm 7 of the pressure pad is inclined by 5 degrees. In this case, the lowest pressure point of the pressing pad 6 is on the side where the FD 2 enters the magnetic head and the pressing pad, that is, on the side of the pressing pad 6a on the side of the recording/reproducing gear part 1a, and the pressing pad on the side of the erasing gear part 1b. 6
b is in a state slightly floating from the magnetic head.

By tilting the pressure pad in this way, the first
As shown in Figures 1 and 12, the frictional force between the magnetic head and the FD caused by increasing the pressing load can be alleviated by the pressing pad on the erasing gap side, thereby preventing the floating of p''D. I was able to do that.

In this embodiment, although the lower limit of the pad pressing load is slightly larger than in the first embodiment, the appropriate range of the pressing load can be widened, and it is possible to select an appropriate load according to the application and usage environment of the FDD. It is now possible, and the durability of the FD is also 200%.
00,000 passes were obtained, and almost the same effect as the first example was obtained.

In this embodiment, the holding arm is tilted in order to give the pressure pad an inclination, but the pressure pad itself may be made to have an inclination.

(Effect of the invention) As is clear from the above explanation, according to the present invention, the FD
A hollow or concave recess is provided in the center of the pressing pad D, and a groove is formed so that the hollow or concave recess faces the gap of the magnetic head and presses the UXD, which reduces the conventional pressing load. Even with less than half the load, the FDD can be stably operated without impairing the electromagnetic conversion characteristics of the magnetic head, and the excellent effect of providing long life and high reliability of the magnetic head and FD can be obtained.

Furthermore, the thickness of the pressing pad is sloped, or the holding part of the pressing pad is sloped to give the pressing pad a slope, and the lowest pressure point of the pressing pad due to the slope is on the entrance side of the FD to the magnetic head. By configuring it to be located at
The appropriate range of pressing load is widened from low load to high load,
It is possible to select an appropriate load according to the application and usage environment of the FDD, and the excellent effect of greatly improving the durability of the magnetic head and the FD can be obtained.

In addition, since the electromagnetic characteristics are not impaired even when the pressing load is around 7 g, there is no problem with durability even if the magnetic head's constituent materials are changed from conventional ferrite and barium titanate to permalloy and metal support materials. Another advantage is that the price of the head can be reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a pressure pad according to a first embodiment of the present invention, FIG. 2 is a diagram showing a state in which the pressure pad presses an FD, and FIGS. FIG. 5 is a configuration diagram of a pressure pad according to a modified embodiment of FIG. 3, and FIG. 6 is an FD using a pressure pad according to a fourth embodiment of the present invention. 7 is a diagram showing the pressed state, FIG. 7 is a configuration diagram of an FDD to which the present invention is applied, and FIG.
Schematic diagram of the FD cartridge used in the FDD shown in Figure 9.
10 is a diagram showing the FD pressing state by the pressing pad, and FIGS. 11 and 12 show the pad pressing load in the embodiment of the present invention and the conventional example. FIG. 3 is a characteristic diagram showing the relationship between reproduction output and modulation. DESCRIPTION OF SYMBOLS 1... Magnetic head, 1a... Gap part for recording and reproduction, 1b... Gap part for erasing, 2...
Magnetic disk, 5... Cavity, 5a... Hollow,
6...Press pad, 7...Arm, 8...
carriage. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 (a) (b) 7 Arm Figure 2 (a) (b) l b -'J k Iff X'wtsu7' 4F 3rd
Figure (a) (b) Figure 4 (a) (bl 5G...IndentationFigure 5 (a) (b)・Atto 7...Arm Figure 8 Figure 9 (a) (b) (o) (b) Figure 11 Figure 12 Bye position location (9r)

Claims (2)

[Claims] (1) In a magnetic recording device equipped with a magnetic disk pressing pad that presses a flexible magnetic disk against a magnetic head, the pressing pad has a cavity or a concave depression in its center, and the cavity or concave part A magnetic recording device characterized in that a recessed portion is arranged to face a gap portion of the magnetic head. (2) The pressure pad has an inclination in its thickness or is inclined due to the inclination of the holding member of the pressure pad, and the lowest point of the pressure pad due to the inclination is the position of the magnetic disk toward the magnetic head. The magnetic recording device according to claim 1, wherein the magnetic recording device is located on the entrance side.