JPS6363189A - Magnetic recording disk device - Google Patents

Abstract

PURPOSE:To improve a recording medium and a recording and reproducing head in durability by supporting a magnetic disk pivotally in an airtight housing filled with lubricating oil and providing the recording and reproducing head which slides on the magnetic disk. CONSTITUTION:The airtight housing 1 is filled with the lubricating oil, and the magnetic disk 2 for vertical magnetic recording, and the recording and reproducing heads 3 and 4 which contact opposite positions on the top and reverse surfaces of the magnetic disk 2 are arranged. Thus, the airtight housing 1 is filled with the lubricating oil, so the heads 2 and 3 and magnetic disk 2 are lubricated. Therefore, the friction generated when the heads 3 and 4 run is reduced and the friction between the heads 3 and 4 and magnetic disk 2 is eliminated to secure the sufficient durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording disk device used in a perpendicular magnetic recording system.

[Prior art and its problems]

BACKGROUND ART In recent years, perpendicular magnetic recording methods, in which signals are recorded and reproduced by magnetizing in the "thickness direction" of a recording medium such as a magnetic tape or a magnetic disk, have been actively researched and attracting attention.

As is well known, according to this method, the minimum magnetization reversal period of the recording medium can be made much more similar than in the conventional so-called longitudinal (in-plane) direction magnetization recording. That is, recording density can be increased. According to the ``Performance of single and perpendicular magnetic heads'' conducted by Nakamura, Lee, Watanabe, and Iwa 11i in the 6th Academic Conference Abstracts of the Japan Society of Applied Magnetics (1982, November), page 9205, the recording density It has been reported that it can actually be increased to more than 200KFRPI. Incidentally, the minimum magnetization reversal period in the recording medium in this case reaches 0.13 μm.

Therefore, conventionally, when recording and reproducing digital signals based on such a perpendicular magnetic recording method, the bit length of the signal itself becomes a slender one corresponding to the above-mentioned minimum magnetization reversal period. In addition to the film thickness of the main magnetic pole that is directly involved in writing and reading the signal, the spacing between the head main magnetic pole and the recording medium is also sufficiently smaller than the minimum magnetization reversal period to ensure that the same signal can be input and output. and reading.

The IEICE study group report (MR84-27) by Yamasui, Nakabo, and Iwasaki, "Spacing loss in perpendicular magnetic recording," reports on the effects of spacing of 1 to 2 μm or less. According to this report, even if dual-layer media and single-pole heads are used for high-density recording, unless the spacing is made sufficiently small relative to the recording wavelength, spacing losses will become large. It has been pointed out. After all, it is a premise that the head main pole or the recording medium is run while the head main pole and the recording medium are in contact with each other.

However, if one of the head main poles and the recording medium is in contact with each other, and one of them is run, the head main pole and the recording medium will wear out due to the friction generated between them, and the head main pole and the recording medium will not have sufficient durability. There was a problem. For this reason, conventional measures have been taken such as applying lubricating oil to the recording medium or using a material with self-lubricating oil for the slider of the head, but it has not been possible to obtain sufficient durability.

In addition, since high-density recording is performed in the perpendicular magnetic recording method, if dirt or dust adheres to the recording medium, data dropouts and data errors may occur during recording and playback. there were.

In addition, JIS C62861 disk cartridge, JIS C6290200mm flexible disk cartridge, and JIS C'6291 1
The 30-run flexible disk cartridge specified is often used for longitudinal magnetization recording for the purpose of facilitating interchange of recording media, but it solves the problems that occur with the perpendicular magnetic recording method as described above. No consideration has been given to this.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic recording disk device in which the durability of a recording medium and a recording/reproducing head is improved, and data dropouts and data errors do not occur.

[Means for solving problems]

The magnetic recording disk device of the present invention is constructed by providing a recording/reproducing head that pivotally supports a d-air disk and slides on the magnetic disk inside an airtight casing filled with lubricating oil.

(Function) According to the magnetic recording disk device of the present invention, the magnetic disk and the recording/reproducing head are lubricated with lubricating oil, so they do not wear out.Furthermore, since the magnetic disk is housed in an airtight housing, No dirt or dust attached.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing a first embodiment of a magnetic recording disk device according to the present invention, and FIG. 2 is a side view of the embodiment shown in FIG. The inside of the airtight casing 1 in this embodiment is filled with lubricating oil, and there is also a magnetic disk 2 for perpendicular magnetic recording, a recording/reproducing head 3 in contact with opposing positions on the upper and lower surfaces of the magnetic disk 2, and a recording/reproducing head 3 and A head 4 for use is provided.

The center of the magnetic disk 2 is fixed to a shaft 5, and the shaft 5 is supported by bearings 6 and 7. Then, the shaft 5 is led out to the outside through the oil-sealed bearing 7 and the hole 8 of the airtight housing 1.
It is directly connected to the rotating shaft of a spindle motor 9 fixed to the outer shell of the housing 1. Therefore, this spindle motor 9 rotates the magnetic disk 2.

Each of the recording and reproducing heads 3 and 4 is fixed to the tips of a temporary spring 11 and a plate spring 12, which are fixed to the yoke part 10a of the arm 10 so as to face each other, and the magnetic disk is They are pressed against the upper and lower surfaces of 2, respectively. The arm 10 includes a sliding portion 13 provided with an oil seal and a hole 1 in the airtight housing 1.
4, and a steel belt 15 is fixed to the end projecting to the outside. This steel belt 15 is wound around a spindle 17 of a stepping motor 16, and when the stepping motor 16 rotates, it is sent out or retracted, thereby moving the arm 10 left and right. At this time, each recording/reproducing head 3, 4
slide on the upper and lower surfaces of the magnetic disk 2 to the left and right, respectively.

Therefore, each of the recording and reproducing heads 3 and 4 runs on the upper and lower surfaces of the magnetic disk 10, respectively, as the spindle motor 9 rotates and the arm 10 moves. Note that the line 1 connected to each recording/reproducing head 3 and 4, respectively.
8 and line 19 are led out to the outside of the airtight housing 1 through the inside of the arm 10, and these lines 18.1
A digital signal is transmitted to 9 when each head 3, 4 runs, and recording and reproduction is performed.

In this way, since the inside of the airtight housing 1 is filled with lubricating oil, the distance between each head 3, 4 and the magnetic disk 2 is always T1.
1 is filled. Therefore, the friction generated when each head 3, 4 runs is reduced, the wear of each head 3.4 and the magnetic disk 2 is prevented, and sufficient durability is ensured. Further, since dust and dirt do not adhere to the magnetic disk 2, data dropouts and data errors do not occur.

FIG. 3 is a side view showing a second embodiment of the magnetic recording disk device according to the present invention. In this figure, the same reference numerals are given to the parts of the magnetic recording disk 5A shown in FIGS. 1 and 2. In this embodiment, a dicephram 30 is provided on the wall of the airtight casing 1 of the disk device shown in FIGS. 1 and 2, and the center of the pulley 31 is fixed to the upper part of the shaft 5. A cylindrical oil filter 32 is fitted inside the oil filter 31.

The daicephram 30 acts to alleviate the pressure difference between the outside and the inside of the airtight housing 1, and to prevent lubricating oil from leaking and air bubbles from entering the inside.

The pulley 31 rotates together with the shaft 5 to circulate the lubricating oil from the inside to the outside of the pulley 31, and the oil filter 32 filters 1g11 of the lubricating oil circulated from the inside to the outside. This functions to collect dust and dirt mixed into the lubricating oil and keep the inside of the airtight casing 1 clean at all times.

FIG. 4 is a plan view showing a third embodiment of the magnetic recording disk device according to the present invention. Inside the airtight casing 4Q filled with lubricating oil in this embodiment, there is a rotatably supported magnetic disk 41, a recording/reproducing head 42 that slides into opposing positions on the upper and lower surfaces of the magnetic disk 41, and a recording/reproducing head 42 for recording and reproducing. A head 43 (not shown), a leaf spring 44 and a leaf spring 45 (not shown), which face each other vertically and have the heads 42 and 43 fixed to their tips, respectively.
An arm 46 to which a 4.45 is fixed, and a voice coil motor 48 to which one end of the arm 46 is fixed to a rotation shaft 47 are provided. When the rotation shaft 47 of the voice coil motor 48 rotates, each head 42 and 43 slides on the upper and lower surfaces of the magnetic disk 41 in the directions of the arrows.

The shaft 49 of the magnetic disk 41 is directly connected to, for example, a spindle motor via an oil-sealed bearing and a hole in the airtight housing 41, and is rotated by this motor.

FIG. 5 is a plan view showing a fourth embodiment of the magnetic recording disk device according to the present invention, and FIG. 6 is a side view of the embodiment shown in FIG. In this embodiment, the inside of the airtight casing 51 is filled with lubricating oil, and a magnetic disk 52 and a recording/reproducing head 53 and a recording/reproducing head 54 contacting opposing positions on the upper and lower surfaces of the magnetic disk 52, respectively. is installed.

A shaft 55 is fixed at the center of the magnetic disk 52, and this shaft 55 is connected to the hole 56 of the airtight housing 51.
It is led out to the outside via a bearing 57 provided with an oil seal, and is supported by the bearing 57 and the bearing 58. Note that the shaft 55 is externally rotated by, for example, a spindle motor (not shown).

Each of the recording and reproducing heads 53 and 54 is fixed to the tips of a plate spring 59 and a temporary spring 60, each having an elongated hole.
They are pressed against the upper and lower surfaces of 2, respectively. The shafts 55 of these leaf springs 59 and 60 extend through their respective elongated holes, and their ends are fixed to arms 61 and 62, respectively. These arms 61 and 62
are led out to the outside through the rubbing parts 63 and 64 provided with oil seals, and the holes 65 and 66 of the airtight housing 51, respectively.

Further, signal transmission lines 67 and 68 are connected to each recording/reproducing head 53 and 54, respectively, and each line 67 and 68 is connected to each arm 61 and 68.
External terminal 69 jj and external terminal 70 through the inside of 2
are connected to each. In addition, each arm 61.62
is externally moved left and right by, for example, a linear pulse motor, and in conjunction with this, each of the recording and reproducing heads 53 and 54 slides left and right on the upper and lower surfaces of the magnetic disk 52, respectively.

According to this embodiment, each of the recording and reproducing heads 53 and 54 has a temporary spring 59 having an elongated hole through which the shaft 55 passes.
．． 60 and slides on the surface of the magnetic disk 52 opposite to the position of each arm 61, 62, compared to the embodiment shown in FIGS. 1 and 2, each arm 6
The airtight housing 51 is miniaturized without requiring a housing space of 1.62 mm.

FIG. 7 is a side view showing a fifth embodiment of the magnetic recording disk cartridge according to the present invention. In this figure, the same parts as in the magnetic recording ice cartridge shown in FIGS. 5 and 6 are given the same reference numerals. This example is
Instead of the airtight casing 51 of the disk cartridge shown in FIGS. 5 and 6, an airtight casing 71 in which a convex portion 71a is formed is used, and a diaphragm 72 is provided on the wall of this airtight casing 71. The center of the morning market 73 is fixed to the upper part of the shaft 55 inside the convex portion 71a, and a cylindrical oil filter 74 is fitted inside the morning market 73.

The diaphragm 72 acts to alleviate the pressure difference between the outside and the inside of the airtight housing 71 and prevent lubricating oil from leaking and air bubbles from entering the inside.

The morning market 73 rotates together with the shaft 55 to circulate lubricating oil from the inside to the outside of the morning market 73,
Further, the oil filter 74 filters the lubricating oil that is circulated from the inside to the outside, collects dust and dirt mixed in the lubricating oil, and serves to keep the inside of the airtight casing 1 clean at all times.

FIG. 8 is a side view showing a sixth embodiment of the magnetic recording disk device according to the present invention. In this figure, the same reference numerals as t are given to the same parts as those of the magnetic recording disk device shown in FIGS. 5 and 6. In this embodiment, a shaft 8 is located inside the cylindrical airtight housing 81 filled with lubricating oil.
2, and three magnetic disks 52 whose centers are fixed at
Recording/reproducing heads 53 and 54 are provided. Then, the three sets of recording and reproducing heads 53 and 54
are fixed to the tips of 3 dark blue leaf springs 59 and 60 fixed to arms 61 and 62 of 3!1, respectively. Further, the arms 61 and 62 of 311 are led out to the outside through each oil-sealed sliding portion 83 and a hole 84 in the airtight casing 81. In addition,
A diaphragm 85 for adjusting the pressure of lubricating oil is provided on the wall of the airtight casing 81, and a morning market 86 and an oil filter 87 are provided above the shaft 51.

According to this embodiment, since three magnetic disks 52 are housed inside the airtight housing 81, one magnetic disk 52 is housed inside the airtight housing 81.
Compared to the magnetic recording disk device in which 2 is accommodated,
Has 3 times as much memory as 8 ears.

〔Effect of the invention〕

As described above, the present invention is constructed by pivotally supporting a magnetic disk and providing a recording/reproducing head in sliding contact with the magnetic disk inside an airtight casing filled with lubricating oil. Therefore, the magnetic disk and the recording/reproducing head are lubricated between each other so that they do not wear out, and dust and dirt do not adhere to the magnetic disk. Therefore, it is possible to provide a magnetic recording disk device in which the durability of the magnetic disk and the recording/reproducing head is improved, and data dropouts and data errors do not occur.

[Brief explanation of drawings]

1 and 2 are a plan view and a side view showing a first embodiment of a magnetic recording disk device according to the present invention, and FIG. 3 is a plan view and a side view showing a second embodiment of a magnetic recording disk device according to the present invention. A side view, FIG. 4 is a plan view showing a third embodiment of the magnetic recording disk device according to the present invention, and FIGS. 5 and 6 show a fourth embodiment of the magnetic recording disk device according to the present invention. A plan view and a side view, FIG. 7 is a side view showing a fifth embodiment of the magnetic recording disk device according to the present invention, and FIG. 8 is a side view showing a sixth embodiment of the magnetic recording disk device according to the present invention. It is a diagram. 1.40.51.71.81...Airtight housing, 2゜41
．． 52...Magnetic disk, 3,4.42,53゜54
...recording/reproducing head, 5,49.55.82...
Shaft, 6.7.57.58... Bearing, 9... Spindle motor, 10.46, 61.62... Arm, 11, 12, 44.59, 60... Leaf spring, 13.
63, 64.83... Grinding portion, 15... Steel belt, 16-... Stepping motor, 17...
Spindle, 18, 19.67.68... line. Figure 2 Figure 6

Claims (1)

[Scope of Claims] An airtight casing filled with lubricating oil, a magnetic disk pivotally supported inside the airtight casing, and a recording/reproducing head provided inside the airtight casing and slidingly in contact with the magnetic disk. A magnetic recording disk device comprising: