JPS60205880A - Attachment structure of magnetic head - Google Patents

Abstract

PURPOSE:To reduce the head span and then to miniaturize a magnetic head or to increase the capacity by fixing the upper and lower hed assemblies to a head arm obliquely to each other when viewed vertically by means of screws. CONSTITUTION:Head assemblies HA and HB contain magnetic heads 8A and 8B attached to gimbals 9A and 9B respectively, and the base end parts of both assemblies are attached to the upper and lower surfaces of a tip part 6a of a head arm with two screws 10A and 10B respectively. These assemblies HA and HB are attached obliquely to each other when viewed vertically. Thus both screws 10A and 10B can be attached with a shift between them and therefore are not overlapped with each other. In such a way, the head span down to 6.0mm. from conventional 7.5mm. is reduced. Thus the packing space can be reduced to attain miniaturization or increase of the capacity of a magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a structure for attaching a magnetic head to a helad arm.

2. Background of the Technology In magnetic disk drives, it is an important issue to achieve both miniaturization and large capacity by mounting a large number of magnetic disks and magnetic heads for reading and writing information in as small a space as possible.

One effective means to solve this problem is to narrow the mounting interval of the magnetic disks. This magnetic disk mounting interval is the spacing between both the upward (up type) and downward (down type) magnetic heads V arranged between the disks.
I owe money to my husband. However, the conventional magnetic head mounting structure has the following problems, and it has been difficult to reduce its span.

PRIOR ART AND PROBLEMS In general, a magnetic head is assembled to an elastic support member (generally referred to as a "gimbal") in advance before being attached to a head arm, and this magnetic head assembly (hereinafter simply referred to as a "head") is assembled in advance. The head arm is attached by screwing the head arm to the upper and lower surfaces of the head arm.

However, in the past, both the up-type and down-type head assemblies were mounted at the same location so that they overlapped each other when viewed in the vertical direction of the tab. Therefore, the set screw position is also the same. In this case, it is necessary to cut taps for the set screws from the upper and lower surfaces of the head arm at the same location, and therefore the head arm plate needs to be thicker than the length of the two set screws. For this reason, conventionally, the minimum thickness of the head arm was limited to approximately 3.0 mm. On the other hand, the minimum height dimension of the head assembly currently in practical use is approximately 2.22w.
Therefore, the head width 4, which includes both the up-type and down-type head assemblies plus the head arm plate thickness, is approximately 7.m.
5m, which was the minimum distance between the disks.

Furthermore, since the mounting positions of both the up-type and down-type head assemblies are the same, there is also the problem that the imaging frequency of the head assemblies is easily transmitted to the head arm.

OBJECTS OF THE INVENTION In view of the above-mentioned prior art, the present invention aims to reduce the size and increase the capacity of a magnetic disk device by making it possible to narrow the disk mounting interval by narrowing the horns of the magnetic head. The purpose of this invention is to provide an improved structure for attaching a magnetic head to a helad arm as a means for improving vibration characteristics.

Structure of the Invention The present invention provides a magnetic disk drive in which a pair of up-type and down-type head assemblies are attached to the upper and lower surfaces of a head arm by screws, respectively, as described above. The structure is such that they are attached obliquely to each other when viewed in the direction of the direction.

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

FIG. 1 is a schematic longitudinal cross-sectional view of a magnetic disk drive according to the present invention, and FIG. 2 is a plan view of the main parts as viewed in the direction of arrow A--A in FIG. Furthermore, the top view 3 and FIG. 4 are top views of the main parts as seen in the directions of arrows B-B and C-C in FIG. 2, respectively.

FIG. 1 schematically shows the main parts of the right half of a disk enclosure of a magnetic disk drive, and reference numerals 1 and 2 designate its housing and cover. Inside the casing 1, a disk assembly in which magnetic disks 3 are stacked in multiple stages is mounted on a spindle 4, and is rotationally driven by a motor 5 provided outside the casing 1. Also assembled inside the housing 1 is a carriage assembly in which the head arm 6 is mounted on a carriage (not shown), and a motor (?
It is rotated by a coil motor).

One head arm 60 is shown in FIG.
is its pit center, and code 0 is the center of the spindle 4. As particularly clearly shown in FIGS. 3 and 4, the tip 6a of the head arm 6 is equipped with an up-type head assembly) IA.
A down-type head f and a three-dimensional HB are attached. Each of these head assemblies HA and HB is a magnetic head 8A.

8B is attached to 9A and 9B.
Attach the base hooks of cymbals 9A and 9B to the head arm tip 6.
It is fastened with two setscrews 10A and 10B on the upper and lower surfaces of the parts a, respectively. Set screw IO
A. The IOB is screwed into a tap formed at the tip of the head arm 6a. However, as is clear from Fig. 2 and Fig. 3, the head is not assembled.

The HBs are mounted obliquely to each other when viewed in the vertical direction (as viewed in Figure 2).

With this, the stopper of both head assemblies HA and HB is The screws IOA and IOB do not overlap but are shifted laterally from each other.

Therefore, the plate thickness t of the Radar arm tip 6a is equal to the set screw 1
It only needs to be longer than the actual length, and can be made thinner than conventional ones.

Incidentally, in the present invention, t can be set to 1.56 gourds, so each head assembly HA.

If the span h of the HB is 2.22m, the entire horn 4-inch H
is 6.0-. In other words, it can be much smaller than the conventional 7.5 liters, and this makes the aesthetic spacing of the magnetic disk 3 (
(see FIG. 1), it becomes possible to mount a large number of magnetic disks in the same casing volume, and a small-sized, large-capacity magnetic disk device can be realized.

Further, as described above, by mounting the head assembly diagonally to the outside, the resonance frequency of the head assembly can be dispersed when transmitted to the head arm, and the vibration characteristics are also improved.

Incidentally, in the diagonal mounting of the head assembly as described above, problems arise such as differences in the azimuth angle of the magnetic head and deviation from the recording area of the magnetic disk. However, these problems can be suppressed to an almost non-problematic level by appropriately selecting the following meters. In Fig. 2, the symbol is a line connecting the spindle center 0 and the head arm bit center P, symbol M A
IMB is the spindle center 0 and magnetic heads 8A, 8B.
and the line connecting each gap center point with the symbol N
A and NB are head arm pivot center P and magnetic head 8
A line connecting each gap center point of A and 8B is shown.

Also, the angle α is between the gap end face of the magnetic head 8A and the line Nh.
The angle β is the angle between the gap end face of the magnetic head 8B and the line NB, and the angle δ is the angle between the line NA and the line N'B.
It is the angle formed by In addition, all of these angles in the factor plane of FIG. 2 should be as close to 90'' as possible, and the difference between the two should be several degrees or less.Furthermore, the angle δ should be as small as possible, for example 0.5 ′ or less.

Effects of the Invention As described above, according to the present invention, by obliquely mounting up-type and down-type magnetic head assemblies to the helad arm, a magnetic disk device that is small in size, has a large capacity, and has excellent vibration characteristics can be realized. can do 0

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of a magnetic disk device according to the present invention, FIG. 2 is a plan view of essential parts taken along the line A-A in FIG.
Figure 3 is a side view of the main part taken along arrow B-B in Figure 2, and Figure 4 is a side view of the main part of Figure 2.
FIG. 2 is a side view of the main part taken along the line CC in the figure. 1... Housing, 2... Cover, 3... Magnetic disk, 4... Spindle, 6... Magnetic helad arm, H
A. HB...Magnetic head assembly, 8A, 8B...Magnetic head, 9A, 9B...Gimbal, 10A110B...
- Set screw.

Claims (1)

[Claims] 1. A magnetic disk drive in which a pair of up-type and down-type magnetic head assemblies, each constructed by assembling a magnetic head on an elastic support member, is attached by screws to the upper and lower surfaces of a head arm, respectively. A magnetic head mounting structure characterized in that both magnetic head assemblies are mounted diagonally to each other when viewed in the vertical direction.