JPS6252384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk device, and more specifically, the present invention relates to a magnetic disk device, and more specifically, to a magnetic disk device in which an access mechanism changes the relative position of each magnetic head and a magnetic disk without excessive positional deviation when accessing the magnetic head. It is related to the device.

A conventional magnetic disk device has a structure as shown in FIG. As shown in the figure, a plurality of magnetic disks 1 are fixed at regular intervals by a hub 2 and fixed to a spindle 3, and the spindle 3 is axially attached to a protrusion of a flat base 5 via bearings 4, 4'. A pulley 6 that is supported and transmits the rotation of a motor (not shown) is fixed thereto.

The plurality of magnetic heads 7 are attached to both sides of a head arm whose one end is connected to a carriage 8. On the opposite side of the head arm, a guide part 9 for moving the carriage 8 in the radial direction of the magnetic disk is provided. An electromagnetic actuator 10 for moving the spindle 8 is disposed on the upper surface of the base 5 so as to slide the carriage 8 in the axial direction of the spindle 3. 11 is a stator of the electromagnetic actuator.

In the magnetic disk device having the above structure, when the magnetic disk 1 is rotated and the carriage 8 is moved by the electromagnetic actuator 10, a reaction force is generated on the stator 11, and the reaction force is applied to the base 5 in the bending direction. The shock load causes the cantilevered base 5 to bend and tilt the guide portion 9, thereby tilting the carriage 8 with respect to the magnetic disk 1.

Therefore, a deviation occurs in the relative position of each magnetic head 7 with respect to the magnetic disk 1, and excessive positional deviation vibration occurs. In order to reduce the amplitude of this misalignment vibration, measures have been taken such as increasing the plate thickness to increase the rigidity of the base 5 or providing a reinforcing beam, but since the base 5 has a cantilevered structure, the stator There was a problem in that it was not possible to achieve a significant effect of reducing deflection against the impactive bending load of the reaction force generated on the head, and as a result, it was not possible to prevent positional displacement due to excessive vibration when accessing the head. .

The present invention has been improved in view of the above-mentioned problems, and the rigidity of the holding member is increased by making the member holding the guide portion of the carriage have a support structure on both ends bridging the magnetic disk. To provide a magnetic disk device whose direction is on a radial line passing through the axial center of gravity of a spindle to which a magnetic disk is fixed, and whose purpose is to prevent vibrations during head access due to reaction force of a stator. .

To achieve the above object, the present invention provides a magnetic disk device equipped with a spindle for supporting a disk-like medium, and an access mechanism provided with a moving coil for moving a magnetic head in the radial direction of the disk-like medium. , both ends of the spindle to which the disk-shaped medium is fixed are pivotally supported via bearings to a housing that houses the disk-shaped medium and is sealed, and the legs of the access mechanism holding member are fixed to the vicinity of the spindle pivot portion. There is a particular thing.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an exploded perspective view of the magnetic disk device of the present invention, in which the same members as in FIG. 1 are given the same symbols.

In Fig. 2, Fig. A shows an assembly of magnetic disks, in which a plurality of magnetic disks 1 are fixed to a spindle 3 at regular intervals by a hub 2, and a flange 1
Bearings 4, 4' with externally fitted bearings 2, 12' are press-fitted into both upper and lower ends of the spindle 3.

As shown in Figures B and C, the housings 13 and 14 have a structure that allows them to be divided into two along a plane parallel to the spindle 3 that supports them, so that it is easy to attach and remove media when replacing the magnetic disk 1. , housings 13 and 14 on each dividing surface.
A fastening hole 15 is provided to connect the two, and a semicircular recess for pivotally supporting the magnetic disk assembly is provided at the upper and lower center of the divided surface, and flanges 12, 12' of the magnetic disk assembly are fixed to the outer surface of the recess. flange fixing surfaces 16, 16' are formed.

Additionally, as shown in Figure B, the housing 13 has
A protrusion 21 for fixing a carriage guide mechanism is disposed inside adjacent to the upper and lower recesses for pivotally supporting the magnetic disk assembly.

Figure D shows the carriage guide mechanism 17, which has a U-shape in side view that is large enough to straddle the magnetic disk 1 from the vicinity of the spindle 3, and has flanges 12, 1 of the magnetic disk assembly at the center of the end faces of the opposing legs.
2' A holding member 1 having a double-end support structure, which has a semicircular recess that tightly fits the outer periphery thereof, and has fixing parts 19 fixed to the protrusions 21 of the housing 13 on both sides of the recess.
8, a carriage 8 is attached with a magnetic head (not shown) on one side and a voice coil 20 for electromagnetic operation is fixed on many sides. It is placed between the legs so that it can slide.

A method of constructing a magnetic disk device using the above-mentioned components is to attach the flanges 12, 12' of the magnetic disk assembly shown in Figure A to the housing 13 of the magnetic disk assembly shown in Figure B.
The flange fixing surface 16,1 is fitted into the upper and lower recesses of the
6', and by fitting the end face recesses of the opposing legs of the holding member 18 into the flanges 12, 12', the sliding direction of the carriage 8 becomes the axial direction of the spindle 3, and the protrusion 21 of the housing 13 The carriage guide mechanism 17 is fixed by tightening the fixing portion 19 to the holder.

Then, with the voice coil 20 of the carriage guide mechanism 17 protruding from the hole provided at the bottom of the housing 14 as shown in Figure C, the carriage guide mechanism 1
7 and the housing 1 by attaching it to the magnetic disk assembly.
3 and a stator 22 for electromagnetic operation shown in Fig. E.
is fixed to the housing 14 so as to be concentric with the voice coil 20 protruding to the outside.

As a result, the carriage guide mechanism 17 is fixed to the protrusions 21 disposed above and below inside the housing 13, forming a support structure on both end faces, and the stator 22 for electromagnetic operation is fixed to the housing 14, so that its center line is aligned with the carriage guide mechanism 17. 8, that is, the radial direction passing through the axial center of gravity of the magnetic disk assembly. Therefore, the reaction force of the stator 22 generated when the magnetic head is accessed becomes an impact load in the tensile direction of the housing 14.

Therefore, there is no bending or elastic deformation of the carriage guide mechanism 17 due to impact loads, and since the carriage guide mechanism has a support structure on both ends as described above, it does not require a strong and heavy structure like a conventional base.

As a result of the above, the carriage guide mechanism is lightweight and has excellent rigidity, and is extremely effective in preventing excessive positional displacement vibrations that occur when the magnetic head is accessed.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a conventional magnetic disk device, and FIG. 2 is an exploded perspective view showing the magnetic disk device of the present invention. In the figure, 1 is a magnetic disk, 2 is a hub, and 3
is the spindle, 4 is the bearing, 5 is the base, 6
is a pulley, 7 is a magnetic head, 8 is a carriage, 9
10 is a carriage guide, 10 is an electromagnetic actuator, 11 is a stator, 12 and 12' are flanges, 13 and 14 are housings, 15 is a fastening hole, 16 and 16' are flange fixing surfaces, 17 is a carriage guide mechanism, 18 is a holding member, 19 and 19' are fixed parts, 20 is a voice coil, 21 is a protrusion of the housing, and 22 is a stator for electromagnetic operation.

Claims (1)

[Scope of Claims] 1. A magnetic disk device equipped with a spindle that supports a disk-shaped medium and an access mechanism provided with a moving coil that moves a magnetic head in the radial direction of the disk-shaped medium. A magnetic disk assembly having two pieces of the disk-shaped medium fixedly fixed to each other and having a bearing with a flange externally fitted at both ends, and a magnetic disk assembly having a shape that can be divided into two parts along a plane parallel to the pivoting spindle, and the upper and lower centers of the dividing plane. a pair of housings that surround and hold the magnetic disk assembly, each having a semicircular recess and a fixing surface that hold the flange; a carriage guide mechanism disposed between the two leg parts so as to slide the carriage to which the magnetic head and the movable coil are fixed to a holding member having a support structure on both end faces in a direction toward the center of the disc-shaped medium; and a stator for driving the movable coil, the magnetic disk assembly having the flange sandwiched and fixed by the pair of housing recesses and surrounded by the pair of housings, and the carriage guide mechanism. The fixing portion is fixed near the upper and lower recesses of the housing, and the stator is attached to the movable coil protruding outward from the housing, and the stator and the carriage guide mechanism are fixed to the movable coil protruding from the housing. A magnetic disk device characterized in that the sliding direction and the center line of the stator are arranged on a radial line passing through the center of gravity of the magnetic disk assembly.