JPH05225769A - Information recording and reproducing device and method for assembling the same - Google Patents

Abstract

PURPOSE:To package disk heads at a high density by forming a head disk assembly of flat planar and bowl-shaped housings, providing a recess on the inner side of the bowl-shaped housing and disposing a spindle and a carriage arm therein. CONSTITUTION:An actuator consisting of disks 2, a spindle 3, a motor 4, a magnetic head 5 and a carriage arm 7, a voice coil motor 9, etc., is provided on the flat planar housing 1. The bowl-type housing 51 having the recess on the surface opposite to the flat plate surface of the housing 1 is formed and a circuit board 31 is mounted to the upper part of the housing 51 in the form that the parts of electronic circuits infiltrate the recess. The thickness and spacing of the disks 2 are reduced as far as possible. The spindle 3, the motor 4, the magnetic head 5 and the carriage arm 7, etc., of the actuator are packaged into the recess of the inner side of the housing 1 and housing 2. Thus, the packaging of the many disks and the magnetic head is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a random access magnetic disk device which is one of the external storage devices of a computer system, and in particular, enables high-density mounting within a fixed device size, Further, the present invention relates to a magnetic disk device and an assembling method thereof that provide an easy assembling method.

[0002]

2. Description of the Related Art A so-called magnetic disk device is a disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a magnetic head for performing electromagnetic conversion, and a magnetic head for radial direction of the recording medium. A head disk assembly (hereinafter abbreviated as HDA) including an actuator for moving and positioning the head and a housing for preventing dust from entering from outside, and for recording / reproducing information and for the motor and the actuator. A circuit board on which an electronic circuit for controlling is mounted, a frame on which the head disk assembly and the circuit board are attached and which are attached to a system case,
It comprises a vibration-proof leg which is provided between the head disk assembly and the frame and blocks vibration impact from the housing.

In the HDA, there are various sealed structures by the housing, and there are various structures in which the circuit board is mounted within a predetermined size of the device.

For example, as a first conventional example, a spindle and a motor incorporating a disk are inserted into a housing having a square cross section and an opening in the peripheral portion, and a magnetic head is further inserted from another opening. After inserting the mounted actuator assembly, there is a structure in which a cover covering these openings is mounted. Further, in this case, since the HDA in which eight discs are mounted occupies the predetermined size of the device, particularly in the height direction, the circuit board on which the electronic circuit is mounted is divided into the frame periphery and the frame. It is mounted in the space between the HDA and the HDA. As this conventional example, there is JP-A-2-260292.

Further, as a device structure of the second conventional example, the housing is divided at substantially the center of the height and is sealed by two bowl-shaped housings. You can think of it as the same as the example. They are,
One or more circuit boards are mounted on the bottom of the device,
The HDA and the circuit board are attached to the frame to form the device. Alternatively, as the device structure of the third conventional example,
It has an HDA structure in which a spindle containing a motor is attached to a bowl-shaped housing, discs are laminated, an actuator assembly having a magnetic head is attached to the disc, and the disc is sealed with a flat cover. A conventional example of these is disclosed in Japanese Patent Laid-Open No. 59-186183.

[0006]

In the case of the first conventional example, when assembling various parts or subassemblies of HDA, they cannot be incorporated from one direction, and the circuit board is also divided. The assembly of the device is complicated and the structure is costly. Further, in the device structure such as the conventional example of the second conventional example, the HDA is
When assembling the parts, the parts and subassemblies can be assembled from one direction, but when attaching the circuit board, the HDA must be inverted, and there is a risk of damaging the disk and head due to the impact of handling, and the bowl-shaped housing. For this reason, there is little gap for arranging jigs and tools for holding parts and sub-assemblies, and it is difficult to insert the magnetic head into the gap of the disk particularly when assembling the HDA, and the assembly cost is high.

When a large number of disks and magnetic heads are to be mounted within the limited device size as in the first conventional example,
The height dimension of the HDA must be substantially the same as the height dimension of the device, and as a result, the circuit board is also divided, resulting in a complicated assembly of the device and a costly structure.

[0008]

In order to solve the above-mentioned problems, a disk of a recording medium, a spindle and a motor, a magnetic head and an actuator are provided on a plate-shaped housing, and the plate-shaped housing is provided. The head disk assembly is composed of a bowl-shaped housing having a concave portion on the surface opposite to the flat plate surface, and a circuit board is provided on the top of the bowl-shaped housing so that the circuit components of the electronic circuit enter the concave portion of the bowl-shaped housing. Attach the board to the bowl-shaped housing.
At this time, a frame for mounting the magnetic disk device in the system case, the head disk assembly and the frame.
An anti-vibration leg that blocks vibration and impact from the casing is provided between the frames.

Further, the thickness and spacing of the discs are reduced as much as possible, and recesses are provided inside the flat plate-shaped housing and the bowl-shaped housing where the movable parts such as the spindle and the motor, the magnetic head and the actuator are mounted. This makes it possible to mount a large number of discs and magnetic heads.

Such an assembly structure enables an easy assembly method and a high-density mounting structure.

..

By the above means, it is possible to mount a large number of disk heads within a limited device size.

Further, an assembly jig and the like can be arranged around the housing by means of a flat housing to assemble HDA components, and a flat housing incorporating the HDA components, a bowl-shaped housing, an electronic circuit board. It is possible to assemble the devices from one direction by stacking them in the order of frames, and the HDA can be hermetically sealed by covering the HDA with a bowl-shaped housing.
An easy assembling method is possible without deteriorating the strength of A. In addition, since the bowl-shaped housing is provided with a concave portion and the electronic circuit board can be mounted without dividing the circuit board in such a manner that a part of the electronic circuit is housed therein, a high-density mounting structure is possible.

Further, since the dividing surface between the flat housing and the bowl-shaped housing does not interfere with the frame, even if the disk diameter and the width of the housing are substantially equal to each other, the frame can be framed.
Since a part of the frame can be mounted in such a manner as to bite into the bowl-shaped housing, the frame strength can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 4 is a perspective view showing the internal structure of the mechanical portion of the magnetic disk device to which the present invention is applied. The disk 2 of the recording medium is placed on the flat housing 1 in a plane parallel to the plane of the housing 1. A spindle 3 rotatably supported, a motor 4 (which is built in the spindle 3) for rotationally driving the spindle 3, a magnetic head 5 for recording and reproducing information in the disk 2 in the form of residual magnetization, and a magnetic A support spring 6 for floating the head 5 on the surface of the disc 2 with a minute gap, a carriage 7 to which one end of the support spring 6 is attached, a pivot 8 for rotatably supporting the carriage 7, and a carriage. A voice coil motor 9 for moving and positioning the magnetic head 5 in the radial direction of the disk 2 by rotating 7 is provided. Here, in the flat housing 1, as shown in FIG. 2, a hygroscopic desiccant 21, a sealing seal 22 therefor, and a hygroscopic desiccant provided on the surface opposite to the surface facing the disk 2. 21, a small hole 23 connecting the space inside the housing, a reference signal writing magnetic head insertion hole 41 for writing a servo signal, a drive mechanism insertion hole 42 for the carriage 7, and a sealing plate 43 for these.
44 is provided. Here, the reference signal writing magnetic head insertion hole 41, the drive mechanism insertion hole 42 of the carriage 7 and the insertion portion of the moisture absorbent desiccant 21 have a step 45 in the periphery thereof, and the sealing plates 43, 44 and the sealing plate. The stop seal 22 is arranged so as to be substantially flush with the flat housing 1.
Furthermore, in the flat housing 1, as shown in FIG.
A clamp 11 for fixing the disc 2 to the spindle 3 is provided, and when a plurality of discs 2 are mounted on the spindle 3, a magnetic head 5 is provided on each face facing the face of the disc 2. Therefore, the spacers 10 are mounted between the discs 2, respectively. In addition, the plate-shaped housing 1 is provided with a flexible printed board 31 which is attached to the carriage 7 and which can draw out a signal line from the magnetic head 5. An information recording / reproducing amplifier 32, which is mounted on reinforcing plates 34a, 34b for bending and fixing the flexible printed circuit board 31 in the housing, and which records / reproduces information on / from the magnetic head 5, is provided on the flexible printed circuit board 31.
An amplifier (not shown) dedicated to the servo signal mounted on the carriage 7 and used for positioning the magnetic head 5 is provided. By providing the vertical portion 34a and the horizontal portion 34b, the reinforcing plate 34 does not interfere with the recess 52 of the bowl-shaped housing described later even when a plurality of information recording / reproducing amplifiers 32 are mounted as shown in FIG. Instead, the information recording / reproducing amplifier 32 can be mounted on the flat housing 1. Also,
The carriage 7 is provided on the bent portion of the flexible printed circuit board 31.
Flexible printed circuit board 3 that presses in the specified direction
1 may be provided with a plate-shaped spring (not shown). Further, in the flat housing 1, a circulation filter 27 for collecting dust in the housing and a vibration of a support spring 6 for supporting the magnetic head 5 by the flow of fluid (usually air) accompanying the rotation of the disk 2 are oscillated. A spoiler 28 for preventing the above is provided. Here, the circulation filter 27 and the spoiler 2
Reference numeral 8 shows an example of being integrally formed.

On the other hand, as shown in FIG. 1, the bowl-shaped housing 51 has a concave portion 52 on a surface parallel to the plane of the flat-plate-shaped housing 1, and a peripheral portion of the bowl-shaped housing 51 contacting the flat-plate-shaped housing 1 is provided. A sealing seal 53 is arranged, and is fixed to the flat housing 1 with a screw 99 by a flange 54 provided outside thereof. Further, the bowl-shaped housing 51 is provided with a boss 55 for mounting a circuit board 71 on which an electronic circuit is mounted on a plane substantially parallel to the plane of the flat housing 1, and as shown in FIG. The frame 81 and the circuit board 71 are attached via the anti-vibration rubber 82. (In FIG. 6, electronic components mounted on the circuit board 71 are omitted.) Further, the bowl-shaped housing 5
As shown in FIG. 1, in FIG. 1, a ridge line 56 on which a frame 81 is mounted is mounted inside a ridge line formed by a surface substantially parallel to the surface of the flat housing 1 and a peripheral surface thereof. As long as it does not interfere with parts such as the disk 2, the recess 57
6 and the frame 8 is provided in the recess 57 as shown in FIG.
The first rib 81a is mounted so as to bite. Further, as shown in FIGS. 6 and 7, the bowl-shaped housing 51 has
An HDA 100 having a flat housing 1 and a bowl-shaped housing 51, in which an arc-shaped surface 51a which is substantially perpendicular to the surface of the flat housing 1 is formed along the disk 2 mounted on the flat housing 1. Circuit board 7 that does not interfere with
It has a rear surface portion 71a of No. 1 and, as shown in FIG. 7, has second and third connectors 71d and 71e for transmitting and receiving control signals to the rear surface portion 71a of the circuit board 71.

In addition, the bowl-shaped housing 51 is shown in FIG.
As shown in FIG. 3, a breathing hole 65 that adjusts the inner and outer pressures of the housing to be the same when sealed in combination with the flat housing 1 and a breathing filter 66 that prevents dust from entering from the outside of the housing through the breathing hole 65 are provided. ing.

Next, the HDA 100 and the circuit board 71 composed of the flat housing 1 and the bowl-shaped housing 51.
The dimensional relationship in the thickness direction will be described with reference to FIGS. 6 and 8. In FIG. 8, the height of the electronic component mounted on the component mounting surface 71d of the circuit board 71 is 5 mm or less, and the thickness of the circuit board 71 (usually made of copper-clad glass epoxy) is 1 mm or less. Further, in FIG. 8, the gap 401 between the HDA 100 and the back surface of the circuit board 71 is defined by the surface 58 on which the magnetic head 5, the support spring 6, the carriage 7, the pivot 8, and the spindle 3 shown in FIG. 1 are mounted, and the voice coil motor 9. Is 2.5 mm or less except the surface 59 mounted inside, and a chip-shaped circuit component is provided on the back surface of the circuit board 71 facing this surface. In addition, the magnetic head 5, the support spring 6, and the carriage 7
The surface 58 on which the pivot 8 is mounted inside and the surface 59 on which the voice coil motor 9 and the spindle 3 are mounted inside secure a clearance of at least 0.1 mm or more from the back surface of the circuit board 71. An insulating plate or an insulating plate and a shielding plate 402 are provided in the gap between the HDA 100 and the back surface of the circuit board 71.
insert. Further, the discs 2 having a thickness of 0.8 mm are stacked on the spindle 3 at intervals of 3 mm, and the flange 3 having a thickness of about 1.8 mm, which is a receiving surface of the discs 2 provided on the spindle 3, is provided.
It is fixed with screws 12 using a clamp 11 having a thickness substantially equal to b. Here, three or more screws 12 are arranged circumferentially, and the seating surface is attached to the clamp 11 in such a manner as to sink. In addition, the flat housing 1 and the bowl-shaped housing 51 are provided with recesses 501 to 504 on the inner surfaces thereof on which the arm portion 7a of the carriage 7 and the spindle 3 are mounted. 7, the arm portion 7a of the spindle 7 and the spindle 3 are arranged so as to bite, and the flange 3 of the spindle 3
With respect to a and the clamp 11, the magnetic head 5, the support spring 6 and the carriage 7, the flat housing 1 and the bowl-shaped housing 51 have a slight clearance. Also, this recess 5
The thickness of the flat plate-shaped housing 1 and the bowl-shaped housing 51 of 01 to 504 parts is 0.8 mm or less, and the flat-plate-shaped housing 1 and the bowl-shaped housing 51 other than the recessed portion
Has a thickness of approximately 2 mm.

The carriage 7 has an arm portion 7a for mounting the support spring 6, a cylindrical portion 7b for insertion into the pivot 8 and an arm portion 7 for mounting the coil 9a of the voice coil motor 9.
c is integrally configured. The axial length of the cylindrical portion 7b is shorter than the axial length of the arm portion 7a to which the support spring 6 is attached, and longer than the axial length of the arm portion 7c to which the coil 9a of the voice coil motor 9 is attached. The pair of bearings 8b provided in the pivot 8 are disposed substantially at both ends of the cylindrical portion 7b of the carriage 7, and the bearings 8b
It has a span shorter than the axial length of the rib portion 7a. The pivot 8 is composed of a fixed shaft 8c, a bearing 8b, a cylinder 8d, and a spring 8e for applying a pressure when the inner and outer rings of the bearing 8b are bonded to the cylinder 8d and the fixed shaft 8c. The cylinder 8d has no flange. The cylindrical portion 7b of the carriage 7 is connected to the cylindrical portion 8 of the pot 8.
It is covered with d and fixed from the side by screws 8f.

A small hole 7e for fixing the support spring 6 is arranged at the tip of the arm 7a of the carriage 7. As shown in FIG. 11, the support spring 6 has a spacer 6a in advance.
Are provided by welding or the like, and the spacer 6a is provided with a boss 6c having a small hole 6b in the center by a method such as pressing. The outer diameter (Dc) of the boss 6c is the small hole 7 of the arm 7a.
It is slightly smaller than the inner diameter (Da) of e, and the inner diameter of the boss 6c partially has a step 6d of the inner diameter (Db). This support spring 6
Is attached to the carriage 7 by the following procedure. First, as shown in FIG. 12a, for example, the boss 6c of the support spring 6 attached to the upper surface of the arm 7a is inserted into the small hole 7e of the arm 7a. At this time, the carriage 7 and the spacer 6a of the support spring 6 are fixed by a jig (not shown). Next, a ball 311 having a diameter (d1) slightly larger than the inner diameter (Db) of the step 6d of the boss 6c is passed from the spacer 6a side into the small hole 6b of the spacer 6a, and the diameter of the ball 311 ( d
The ball 312 having a diameter (d2) slightly larger than 1) is fixed by passing it from the spacer 6a side through the small hole 6b of the spacer 6a. Then, as shown in FIG. 12b, the carriage 7
The boss 6c of the spacer 6a of the support spring 6 attached to the lower surface of the arm 7a is inserted into the small hole 7e of the arm 7a and fixed by another jig. And again, balls 311 and 312
Through the small holes 6b of the spacer 6a from the spacer 6a side, and all the support springs 6 are attached to the carriage 7. When the support springs are attached only to the upper surface or the lower surface of the arms 7a at both ends of the carriage 7, it may be performed in the step of attaching the support springs to the upper surface or the lower surface, respectively. Here, when the support springs are attached only to the upper surface or the lower surface of the arms 7f at both ends of the carriage 7, at least the arms 7f at both ends of the carriage 7 are provided.
The portion of the support spring 6 to which the spacer 6a is attached is
The balls 311 and 3 have a thickness substantially equal to that of the other arm 7a.
It has the effect of preventing the arm 7f from bending when passing through 12. In this case, the arms 7f at both ends of the carriage 7 are
There may be steps here. Above is the sphere 311 and 31
Although the method of connecting the carriage 7 and the support spring 6 in the step of passing the spacer 2 from the direction of the spacer 6a toward the arms 7a and 7f has been described, as shown in FIG.
A method may be used in which the carriage 7 and the support spring 6 are coupled in the step of passing 12 from the direction of the arms 7a and 7f toward the spacer 6a. A thin plate arm 7 that is substantially equal to or almost the same as the thickness of the boss 6c of the pair of facing spacers 6a.
This is effective when using a and 7f. This is a sphere 311
And 312 pass through the step 6d of the boss 6c, the step 6d of the boss 6c slightly extends in the axial direction through which the spheres 311 and 312 pass, and the bosses 6c of the opposed spacers 6a interfere with each other. This is to prevent

By constructing the carriage 7 and the pivot 8 in this manner, the flat plate-shaped housing 1 can be provided with the cylindrical support portion 1b for fixing the fixed shaft 8c of the pivot 8 thereto, and furthermore, the pivot The flat housing 1 and the bowl-shaped housing 51 where 8 is located need not be provided with a recess. Further, the flat plate-shaped housing 1 can be provided with a cylindrical support portion 1c for fixing and fixing the fixed shaft 3a of the spindle 3 and further, the spindle 3
It is not necessary to provide the flat housing 1 and the bowl-shaped housing 51 with a recess other than the flange 3b where the is located and the clamp 11.

By making the dimensional relationship as described above, the thickness dimension of the magnetic disk device shown in FIG.
It is possible to mount 8 disks 2 and 16 magnetic heads 5 in mm. Further, as shown in FIG. 9, when the thickness of the device is set to 25.4 mm, it becomes possible to mount four discs 2 and eight magnetic heads 5. Here, the thickness of the disc 2 is 0.8 mm, and the interval between the discs 2 is 3 mm.
However, by setting the thickness of the disk 2 to 0.64 mm or less and the distance between the disks 2 to 2.54 mm or less, the HDA 100 and the circuit board 71 shown in FIG. Even when configuring a disk device, the device thickness dimension 4
It is possible to mount nine or more disks 2 and 18 or more magnetic heads 5 with a size of 1.3 mm, and the thickness dimension of the device is 2
When it is set to 5.4 mm, it is possible to mount five or more discs 2 and ten or more magnetic heads 5.

Further, in the above-described embodiment, the carriage 7
Although the cylindrical portion 7b has a shorter axial length than the arm portion 7a, the carriage 7 and the arm portion 7a have substantially the same axial length. Also good.

That is, the axial length of the cylindrical portion 7b of the carriage 7 is equal to or shorter than the axial length of the arm portion 7a to which the support spring 6 is attached, and the coil 9a of the voice coil motor 9 is used.
It is configured to be longer than the axial length of the arm portion 7c to be mounted. Further, the axial length of the whole or a part of the cylindrical portion 7b of the carriage 7 is made substantially equal to the length of the cylindrical portion 8d of the pivot 8. FIG. 10 shows the shape of the carriage 7. The bearing 8b provided on the pivot 8 is covered with a part or the whole of the cylindrical portion 7b of the carriage 7. By arranging the bearings 8b at both ends of the cylindrical portion 8d of the pivot 8 which is substantially equal to the cylindrical portion 7b of the carriage 7 in this way, the flow of the wind caused by the rotation of the disc 2 arranged on the spindle 3 directly affects the pivot. The lubricant (such as grease) sealed in the bearing 8b without hitting the side surfaces of the bearing 8b provided at both ends of the cylindrical portion 8d of No. 8
Is prevented from leaking from the end of the bearing, and the cleanliness inside the HDA can be maintained. Therefore, when the bearing 8b provided on the pivot 7 is covered with a part of the cylindrical portion 7b of the carriage 7, the axial length on the arm side where the support spring 6 of the cylindrical portion 7b of the carriage 7 is mounted is set to the axial length of the carriage 7. Cylindrical part 7
Install the coil 9a of the voice coil motor 9b
The length may be longer than the axial length on the side of the diaphragm. Even with such a configuration, the axial length of the cylindrical portion 7b of the carriage 7 can be made shorter than the axial length of the arm portion 7a to which the support spring 6 is attached, and at the same time as the arm portion 7a of the carriage 7. Since the contacting cylindrical portion 7d only rotates around the pivot 8, the above-mentioned effects are not lost at all, and a high-density disc / head can be mounted.

Next, the features of the apparatus viewed in plan, such as the rotational center arrangement of the spindle 3 and the pivot 8 of the magnetic disk apparatus described above, will be described with reference to FIG.

FIG. 14 is a plan view of the HDA 100 shown in FIG. 1, showing its internal arrangement. A description will be given by taking the longitudinal dimension of the device as the vertical axis and the rectangular dimension as the horizontal axis, and the rotation center 3e of the spindle 3 as the coordinate origin. In FIG. 14, the rotation direction of the spindle 3 and the disc 2 is counterclockwise, and the rotation center 8g of the pivot 8 is located in the third quadrant. Further, the recessed portion 52 provided in the bowl-shaped housing 51 described above is arranged in the fourth quadrant. The arm 7a of the carriage 7 and the support spring 6 of the magnetic head 5 linearly extend from the rotation center 8g of the pivot 8 in the fourth quadrant so as to traverse the disk 2 in the radial direction. A line 7f connecting the rotation center 8g of the pivot 8 and the center of the recording / reproducing gap 5b provided at one end of the slider portion 5a of the magnetic head 5 shown in FIG. 16 is offset in parallel with the center line 6a of the support spring 6. The carriage 7, the magnetic head 5, the support spring 6, and the VCM coil 9b are asymmetric with respect to the line 7f connecting the center 8f of the pivot 8 and the center of the recording / reproducing gap 5b.

The recording area of the disk 2 is in the range of radii Rin to Rout, and some guard bands are arranged outside and inside so that it can be detected that it is outside the recording area. A signal is written on the disk 2.
Here, the rotation radius of the recording / reproducing gap 5b with respect to the rotation center 8g of the pivot 8 is Rh, and the axial distance between the rotation center 8g of the pivot 8 and the rotation center 3e of the spindle 3 is D.
And Further, the rotation locus 5r of the recording / reproducing gap 5b of the magnetic head 5 and the radius Rin and Rout of the recording area.
Let S and T be the intersections with and respectively, and the vertical lines 3e-S and 3 drawn from the rotation center 3e of the spindle 3 to S and T, respectively.
Line segments perpendicular to e-T are S1-S2 and T1-T2.
Furthermore, the line connecting the rotation center 8g of the pivot 8 and S and the line segment S
The angle formed by 1-S2 is α, the rotation center 8g of the pivot 8 and T
The angle formed by the line connecting T and the line segment T1-T2 is β. This α
And β are from the recording area radius Rin of the disc 2 to Rout,
The radius of rotation Rh of the recording / reproducing gap 5b and the axial distance D between the center of rotation 8g of the pivot 8 and the center of rotation 3e of the spindle 3 are unitarily determined, and are generally called yaw angles. In this embodiment, the slider 5a of the magnetic head 5 is used.
Slider 5a provided with a recording / reproducing gap 5b
17 is set to α≈−1 ° and β≈18 ° so that the floating amount of the floating surface 5c of the disk 2 changes in the radial direction of the disk 2 as much as possible. The change is indicated by. At this time, the magnetic head 5
The flying height of the other air bearing surface 5d of the slider 5a not provided with the recording / reproducing gap 5b is set higher than the flying height of the air bearing surface 5c. Therefore, the weight 5e applied to the slider 5a of the magnetic head 5 from the support spring 6 is arranged offset from the center line of each side as shown in FIG. 15 (b). Where the ratio of α to β is (β
/ Α) ≈ 15 is shown, but this is especially the case where a disk with a small diameter is used and the ratio of the recording area radius Rin to Rout (R
Even when out / Rin) is large, it is effective as a method for reducing the amount of change in the flying height of the flying surface 5c of the slider 5a in the radial direction of the disc 2. In this embodiment, the disc 2 has a diameter of 95 mm, (Rout / Rin) ≈2, a radius of gyration Rh≈56 mm, and an interaxial distance D≈60 mm. From the above, as shown in FIG. 17, the flying height 191 of the flying surface 5c of the slider 5a provided with the recording / reproducing gap 5b of the slider 5a of the magnetic head 5 does not change by 20% or more in the radial direction of the disc 2. The amount can be set, and as a result, the recording linear density of the disc 2 can be set as shown in FIG. 18, which has the effect of increasing the storage capacity, and can be made compact without enlarging the longitudinal dimension of the device. ..

Next, a procedure for assembling and manufacturing the above-mentioned structure will be described.

First, as shown in FIG. 2, the plate-shaped housing 1 is subjected to an impact-type desiccant 21, a device nameplate 26, a shock during the manufacturing process, or until the magnetic disk device is attached to the system case. A member provided on the opposite side of the mounting surface of the disc 2 such as a damper 25 for relaxing the above is attached in advance. Thereafter, as shown in FIG. 3, the spindle 3 having the motor 4 built in the flat housing 1 and the pivot 8 are provided on the flat housing 1 by fixing one ends of the respective shafts 3a and 8a by adhesion. The reference surface 1a is mounted with a predetermined size. Next, this flat housing is placed on the pallet 300 used in the manufacturing process shown in FIG. 5, and as shown in FIG. 4, the disk 2 is mounted on the spindle 3 incorporating the motor 4 via the spacer 10. The magnetic head 5 and the coil 9 of the voice coil motor 9 are stacked in the pivot 8.
a and the carriage 7 provided with the flexible printed circuit board 31 are attached from the side with screws (not shown), the magnetic head 5 is inserted between the discs 2, and then the magnet 9b of the voice coil motor 9 is attached to the flat housing 1. Attach to.
The flexible printed board 31 is attached to the flat housing 1 at the position of the reinforcing plate 34. (The pallet 300 is omitted in FIGS. 1, 3, 4, and 6 used in the following description.) Thus, after the main components of the HDA 100 are attached to the flat housing 1, as shown in FIG. The HDA 100 is completed by covering the bowl-shaped housing 51 with a flange 54 provided on the outer side of the bowl-shaped housing 51, and by butt-contacting the flat-plate housing 1 and crushing the seal 53 provided on the bowl-shaped housing 51. At this time, the other ends of the shafts 3a and 8a of the spindle 3 and the pivot 8 are fixed to the bowl-shaped housing 51 with screws 61 and 62, and the other end of the flexible printed board 31 is a seal 53.
It is pulled out through the outside of the HDA 100.

Next, the HDA 100 is loaded into the pallet 300.
5 is mounted on the servo signal writing device 200 while the flat housing 1 is mounted on the servo signal writing device 200 as shown in FIG. 5, and the flat signal is provided on the flat housing 1. Insertion hole 4 of the magnetic head 201 for signal writing
1 through the drive mechanism insertion hole 42 of the carriage 7
A magnetic head 201 for writing a reference signal and a drive pin 2 of the carriage 7 provided in the device 200 for writing a signal.
02 is inserted and the servo signal is written.

After that, the insertion hole 41 of the magnetic head for writing the reference signal and the insertion hole 42 for the drive mechanism of the carriage 7 provided in the flat housing 1 have the sealing plates 43 and 44 in the form shown in FIG. Then, the HDA 100 is sealed and completed.

In this HDA 100, as shown in FIG.
A circuit board 71 having an electronic circuit mounted on a boss 52 provided in a bowl-shaped housing 51 is provided with a vibration proof rubber 82 to form a frame 8.
1 and the horizontal frame 83. Also, HDA
The other end of the flexible printed board 31 that is drawn out of the 100 is inserted into the power supply connector 71b of the circuit board 71, and the lead wire 4a of the motor 4 built in the spindle 3 is provided.
Is similarly inserted into the power supply connector 71c of the circuit board 71 to complete the magnetic disk device. At this time, the circuit board 71 is placed in the recess 52 provided in the bowl-shaped housing 51.
It is mounted in such a way that a part of the electronic components mounted in is inserted.

Finally, the function and performance of this completed magnetic disk device are tested by a tester while being placed on a pallet, and a series of manufacturing steps are completed. The magnetic disk device that has been inspected has the appearance as shown in FIG. 7 after being removed from the pallet, and is shipped with the damper 25 attached first.

When this magnetic disk device is mounted in the casing of an information processing device such as a workstation, the circuit board 71 is arranged so that the circuit board 71 is on the lower surface or the side surface as shown in FIG. -It is fixed to the housing by the screw hole 81b of the hole 81.

By adopting the above-described assembly / manufacturing procedure, it is possible to prevent the HDA from being inverted during manufacturing.
Further, since the damper 25 or the vibration-proof rubber 82 acts as an interference with the HDA 100 even when the magnetic disk device receives a shock during handling before being mounted in the housing of the information processing apparatus, it is provided in the HDA 100. Disc 2
And has an effect of preventing damage to the magnetic head 5.

[0036]

According to the present embodiment, first, it becomes possible to mount a large number of disk heads within a certain limited device size.
It is possible to prevent the flow of air in A from adversely affecting the lubricant used for the rotating member.

Further, a spindle motor and a pivot mounted on a flat housing, a disc laminated on the spindle motor, a magnetic head mounted on the pivot and a carriage provided with a coil of a voice coil motor, and a voice coil motor. It is possible to install main parts such as the magnetet from one direction of the surface of the flat plate-shaped housing. Furthermore, when the magnetic head is inserted between the discs, the flat plate-shaped housing is used, A jig or the like can be arranged including the periphery of the housing. After attaching the main components of HDA to the flat housing,
The bowl-shaped housing can be assembled from the same direction as the spindle motor, pivot, disk, or carriage, and the electronic circuit board and frame can be assembled in the same direction as the bowl-shaped housing. Since the magnetic disk device can be assembled from one side, the magnetic disk device can be assembled on one side and the assembly is facilitated.

Also, when writing a servo signal to the HDA, the assembled HDA can be mounted in the servo signal writing device without inverting, and the circuit board to be assembled thereafter is also arranged on the upper surface of the HDA. Therefore, the device test can be performed while taking out the internal signal of the circuit, and it becomes easy to comprehensively automate the assembly inspection process.

Further, the height mounted on the circuit board is high,
For example, since a hybrid IC or the like can be mounted in such a manner as to bite into a bowl-shaped housing, the mounting density of the circuit board is improved, and even if the number of circuit components increases, it can be accommodated in a predetermined external dimension, and a small magnetic disk device is provided. Has the effect that can.

Further, a frame is attached to a part of the bowl-shaped housing.
Since it can be mounted in such a way that the ribs of the frame bite into it, it has the effect of improving the strength of the frame.

Furthermore, since the bowl-shaped housing has a part of the side surface formed by the curved surface along the disk, when the circuit board is attached to the bowl-shaped housing, the surface of the circuit board facing the bowl-shaped housing is fixed. A surface that is not covered by the bowl-shaped housing is provided so that circuit components such as a connector can be attached to the surface, and when the magnetic disk device is mounted in a casing such as a workstation, the connector can be easily mounted. Can be fitted.

[Brief description of drawings]

FIG. 1 is a perspective view of a bowl-shaped housing.

FIG. 2 is a perspective view showing a flat housing and components.

FIG. 3 is a perspective view showing a spindle and a pivot attached to a flat housing.

FIG. 4 is a perspective view of a flat housing in which main components of HDA are mounted on the flat housing.

FIG. 5 is a perspective view of HDA mounted on a pallet mounted on a servo signal writing device.

FIG. 6 is a perspective view in which a circuit board and a frame are attached to an HDA.

FIG. 7 is a perspective view of the completed magnetic disk device.

FIG. 8 is a sectional view showing the internal structure (1) of the magnetic disk device.

FIG. 9 is a sectional view showing the internal structure (2) of the magnetic disk device.

FIG. 10 is a perspective view showing the structure of a carriage.

FIG. 11 is a perspective view of a support spring.

FIG. 12 is a sectional view showing a mounting method 1 of a support spring.

FIG. 13 is a sectional view showing a mounting method 2 of a support spring.

FIG. 14 is a plan view of HDA.

FIG. 15 is a perspective view of a support spring and a magnetic head.

FIG. 16 is a perspective view of a slider portion.

FIG. 17 is a graph showing the flying height and yaw angle change in the radial direction of the disc.

FIG. 18 is a graph showing changes in recording density in the radial direction of the disc.

[Explanation of symbols]

1 Flat housing 2 Disc 3
Spindle 4 Motor 5 Magnetic head 6
Support spring 7 Carriage 7a Carriage arm part 7b Carriage cylinder part 8 Pivot 9 Voice coil motor 10 Spacer 11 Clamp 31 Flexible printed circuit board 51 Bowl-shaped housing 52 Recess 57
Recess 51a Arc surface 81 Frame 81a Rib 82
Anti-vibration rubber 501-504 Gap

Front page continuation (72) Inventor Haruhiko Hosokawa 2880 Kokuzu, Odawara-shi, Kanagawa Hitachi Ltd. Odawara factory (72) Inventor Toshihisa Okazaki 2880 Kozu, Odawara, Kanagawa Hitachi Ltd. Odawara factory

Claims (14)

[Claims] 1. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. An information recording / reproducing apparatus comprising a circuit board on which an electronic circuit for controlling the information recording / reproducing apparatus is provided, wherein a recess for arranging the spindle and at least the arm of the carriage is provided inside the housing. 2. The information recording / reproducing apparatus according to claim 1, wherein the housing comprises a substantially flat plate-shaped member and a bowl-shaped member. 3. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus including a circuit board on which a controlling electronic circuit is mounted, a recess for arranging the spindle and at least the carriage arm is provided inside the housing, and the spindle and at least the carriage arm are provided in the recess. A method for mounting an information recording / reproducing apparatus, characterized in that the information recording / reproducing apparatus is arranged in such a manner as to bite into it. 4. An information recording / reproducing apparatus according to claim 3, wherein the housing comprises a substantially flat plate-shaped member and a bowl-shaped member. 5. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. An information recording / reproducing apparatus comprising a circuit board on which an electronic circuit for controlling the information recording / reproducing apparatus is provided, wherein the housing is provided with a substantially annular rising portion for mounting at least the shaft of the spindle or the shaft supporting the carriage. Playback device. 6. An information recording / reproducing apparatus according to claim 5, wherein the housing comprises a substantially flat plate-shaped member and a bowl-shaped member. 7. The information recording / reproducing apparatus according to claim 5, wherein the housing comprises a substantially flat plate-shaped member and a bowl-shaped member, and the housing has at least a shaft of the spindle,
Alternatively, the mounting method of the information recording / reproducing apparatus is characterized in that the shaft of the spindle or the shaft supporting the carriage is attached to the substantially annular rising portion to which the shaft supporting the carriage is attached by adhesion. 8. An information recording / reproducing apparatus according to claim 5, wherein the housing comprises a substantially flat plate-shaped member and a bowl-shaped member, and the rising portion is provided on the substantially flat plate-shaped member. Playback device. 9. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus including a circuit board on which a controlling electronic circuit is mounted, the carriage includes a first arm portion supporting the converter, a substantially cylindrical portion having a rotation center, and the first arm portion. The second arm portion extends in the opposite direction, and at least the axial length of the substantially cylindrical portion is shorter than the axial length of the first arm portion, or the second arm portion. Longer than the axial length of the Information recording and reproducing apparatus characterized. 10. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. A mechanism portion including a pivot for rotatably supporting the carriage, an actuator for moving and positioning the converter in the radial direction of a recording medium, and a housing including these, and at least recording / reproducing information and rotating the motor. In an information recording / reproducing apparatus comprising a circuit board on which an electronic circuit for controlling or controlling the actuator is mounted,
The information recording / reproducing apparatus, wherein the carriage has a substantially cylindrical portion that engages with the pivot, and the substantially cylindrical portion axially covers all or part of the circumference of the pivot. 11. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus in which a circuit board on which a controlling electronic circuit is mounted is arranged in parallel with the recording medium in the axial direction of the spindle,
A recess for arranging the spindle and at least the arm of the carriage is provided inside the housing, and 8 or more recording media and 16 or more converters are provided within a device size of 41.3 mm in the axial direction of the spindle. An information recording / reproducing apparatus characterized by being provided. 12. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus in which a circuit board on which a controlling electronic circuit is mounted is arranged in parallel with the recording medium in the axial direction of the spindle,
A recess for arranging the spindle and at least the arm of the carriage is provided inside the housing, and four or more recording media and eight or more converters are provided within a device size of 25.4 mm in the axial direction of the spindle. An information recording / reproducing apparatus characterized by being provided. 13. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus in which a circuit board on which an electronic circuit for controlling is mounted is arranged in parallel with the recording medium in the axial direction of the spindle, and the converter is linearly arranged from the rotation center of the actuator, A recess for arranging the spindle and at least the arm of the carriage is provided inside, and 8 or more of the recording media are converted within the device size of 41.3 mm in the axial direction of the spindle. Information recording and reproducing apparatus characterized by the provided 16 or more. 14. A disk-shaped recording medium for recording information, a spindle and a motor for rotating the recording medium, a converter for electromagnetically converting information to the recording medium, and a carriage for supporting the converter. An actuator for moving and positioning the converter in the radial direction of the recording medium, and a mechanism section including a housing including these elements, and at least recording / reproducing of information, rotation control of the motor, or control of the actuator. In an information recording / reproducing apparatus in which a circuit board on which an electronic circuit for controlling is mounted is arranged in parallel with the recording medium in the axial direction of the spindle, and the converter is linearly arranged from the rotation center of the actuator, A recess for arranging the spindle and at least the arm of the carriage is provided on the inside, and four or more recording media are converted within a device size of 25.4 mm in the axial direction of the spindle. Information recording and reproducing apparatus characterized by the provided 8 or more.