JPH06119733A - Head retracting mechanism of magnetic disk device - Google Patents

Abstract

PURPOSE:To comply with the request thinning a magnetic disk by providing a slider retracting part, having the thickness equivalent to the that of the magnetic disk in the neighborhood of the outer periphery of the magnetic disk and also in its extended area. CONSTITUTION:In the magnetic disk device, the slider retracting part 7a having the thickness equivalent to that of the magnetic disk 2 is provided in the neighborhood of the outer periphery of the magnetic disk 2 and also its extended area, as a head retracting mechanism. By this arrangement, the slider 6 can be retracted by only moving the slider 6 to the side of the slider retracting part 7a which is arranged in the extended area of the magnetic disk 2, in parallel to the magnetic disk surface from a contact start stop position at the time of retracting operation, without lifting the slider 6 in the vertical direction from the surface of the magnetic dusk 2. Consequently, the distance between each magnetic disks 2 and furthermore the overall thickness of the magnetic disk device 1 itself are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head retracting mechanism for a magnetic disk drive which employs, for example, a peripheral contact start / stop system.

[0002]

2. Description of the Related Art An outline of a conventional magnetic disk device will be described with reference to FIG. In the conventional magnetic disk device 50, an arbitrary number of magnetic disks 52 arranged in parallel which are rotationally driven in a horizontal arrangement by a drive source (not shown),
A load arm 53 that is rotatably supported by a support shaft arranged in an outer region of the magnetic disk 52 and moves along the surface of the magnetic disk 52, and an upper surface and a lower surface of the magnetic disk 52 that are supported by the load arm 53. And a slider 51 for writing and reading magnetic information in contact with or in close proximity to.

In the magnetic disk device 50 having the above-described structure, when the slider 51 is retracted from the upper surface and the lower surface of the magnetic disk 52 together with the load arm 53, the load arm 53 is moved from the upper surface and the lower surface of the magnetic disk 52 to h1 (=
After a distance of several mm, the load arm 53 is rotated to retract the slider 51 to the outside of the magnetic disk 52. With such a configuration, the slider 51 and the magnetic disk 52 are prevented from being damaged by the impact force from the outside, and also the damage due to the collision between the load arms 53 arranged above and below is prevented. Three
No. 503101).

[0004]

However, in the case of the above-mentioned conventional magnetic disk device 50, the load arm 5 is used.
In order to secure a state in which 3 is separated from the upper surface and the lower surface of the magnetic disk 52 by h1, in the case where there are a plurality of magnetic disks 52, in addition to the proper proper interval between the magnetic disks 52, 2 × h1 minutes It is necessary to provide an interval h0 between the magnetic disks 52 that is as large as possible. As a result, in the conventional magnetic disk device 50, the thickness of the magnetic disk device 50 becomes large, and there is a problem that it is not possible to meet the demand for thinning the magnetic disk device 50.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a head retracting mechanism which can improve the structure and contribute to the thinning of a magnetic disk device.

[0006]

The invention according to claim 1 is
A magnetic disk that is driven to rotate, a load arm that is rotatably supported by a support shaft that is arranged in an outer region of the magnetic disk, and moves along the magnetic disk surface, and a load arm that is supported by the load arm and that is on the magnetic disk surface A head retracting mechanism used in a magnetic disk device having a slider for writing and reading magnetic information in contact with or in close proximity to the magnetic disk, in the vicinity of the outer circumference of the magnetic disk and in an extension region thereof, having a thickness equal to that of the magnetic disk. It is characterized in that a slider retreat having a thickness of 1 is provided.

According to a second aspect of the present invention, the slider retracting portion is made of the same material as the magnetic disk.

According to a third aspect of the present invention, the slider retracting portion is made of a polymer material.

According to a fourth aspect of the present invention, the slider retracting portion is made of a polymer material containing Teflon.

According to a fifth aspect of the present invention, a chamfered portion of 0.05 mm to 0.3 mm is provided at the outer peripheral end of the magnetic disk and the end of the slider retracting part facing the outer periphery of the magnetic disk. .

[0011]

According to the head retracting mechanism used in the magnetic disk device having the above-described structure, the slider retracting portion having a thickness equivalent to that of the magnetic disk is provided in the vicinity of the outer periphery of the magnetic disk and in the extension region thereof. Without retracting the slider vertically from the magnetic disk surface during the retracting operation, the magnetic head can be retracted simply by moving from the contact start / stop position to the slider retracting portion side that is arranged in the extension area of the magnetic disk parallel to the magnetic disk surface. You can As a result, the distance between the magnetic disks and the overall thickness of the magnetic disk device itself can be reduced as compared with the conventional example.

Further, when the slider retreat portion is made of the same material as the magnetic disk or is formed of a polymer material, particularly a polymer material including Teflon, the lower surface of the slider is damaged by impact when the slider is retracted. Can be prevented.

Further, at the outer peripheral end of the magnetic disk and the end of the slider retracting part facing the outer periphery of the magnetic disk,
By providing the chamfered portion of 0.05 mm to 0.3 mm, the slider can be smoothly moved during the retracting operation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A head retracting mechanism of a magnetic disk device according to an embodiment of the present invention will be described in detail below. FIG. 1 is a schematic plan view of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view taken along the line AA in FIG.

The magnetic disk drive 1 shown in FIGS. 1 and 2.
Is a box-shaped main body 1A, an arbitrary number of magnetic disks 2 which are horizontally arranged at predetermined positions in the main body 1A with a constant interval, and are concentrically mounted and driven to rotate, and this magnetic disk. 2, a substantially rectangular load arm 5 that is rotatably supported by a support shaft 3 arranged in the outer region of the magnetic disk 2 and moves along the surface of the magnetic disk 2, and a load arm 5 that is supported by a protruding tip portion of the load arm 5 and is magnetic. A slider 6 for writing and reading magnetic information in contact with or in the vicinity of the surface of the disk 2, a square bobbin 13 attached to the rear side of the support shaft 3 of the load arm 5, and a bobbin 13 on the bobbin 13. The wound coil 12, the magnet 16 arranged below the rotating region of the bobbin 13, and the inner end of the bobbin 13 arranged between the bobbin 13 and the outer peripheral side of the magnetic disk 2 come into contact with each other. The outer stopper 14, the bobbin 1
An inner stopper 15 with which an outer end portion of a bobbin 13 arranged outside of 3 abuts, and a first plunger 8 having a first plunger pin 9 arranged outside the magnet 16 near the outer stopper 14. , A second plunger 10 comprising a second plunger pin 11 arranged between the first plunger 8 and the inner stopper 15.
And a retreat portion 7 provided with a slider retreat portion 7a having a thickness equivalent to the thickness of the magnetic disk 2 arranged in the extension region in the vicinity of the outer periphery of the magnetic disk 2.

The coil 12 and the magnet 16 constitute a voice coil motor 4 for rotationally driving the load arm 5. First plunger pin 9 of first plunger 8
Is capable of projecting and retracting in an end region of the bobbin 13, and engages with an engaging recess 13a provided in the bobbin 13 when protruding. The first plunger 8 temporarily stops the slider 6 at the contact start / stop position when the magnetic head 6a is retracted, and prevents the slider 6 from moving due to a shock or the like when the slider 6 is retracted. Is. The second plunger 10 is for temporarily stopping the slider 6 which rotates from the retracted position on the magnetic disk when the magnetic disk 2 is activated, to the contact start / stop position on the magnetic disk.

As shown in FIG. 2, the retracting section 7 is a main body 1A.
Mounting piece 7 attached to the bottom of the bolt 17
b, and a slider retreat portion 7a that horizontally protrudes from the mounting piece 7b in the vicinity of the outer circumference of the magnetic disk 2 and in an extension area thereof. The slider retreat portion 7a is provided according to the number of magnetic disks 2. The slider retreat portion 7a is formed of the same material as the magnetic disk 2 or a polymer material, particularly a polymer material including Teflon.

Further, at the outer peripheral end of the magnetic disk 2 and the end of the slider retracting portion 7a of the retracting portion 7 facing the outer periphery of the magnetic disk 2, as shown enlarged in FIG.
Chamfered portions 2a and 7c having a size of mm to 0.3 mm are provided. In addition, as shown enlarged in FIG.
Of the inclination angle (yaw angle) θ between a line orthogonal to the line connecting the center of the slider 6 and the center of the slider 6 and the side surface of the slider 6.
Are formed. Therefore, the outer peripheral end of the magnetic disk 2 and the end of the slider retracting portion 7a are shown in FIG.
And the inclination width W2 of the slider 6 shown in FIG.
If the retracting portion 7 is formed so that the relationship with W1 <W2, the slider 6 can smoothly move the chamfered portions 2a and 7c described above during the retracting operation of the slider 6. If the chamfered portion is smaller than 0.05 mm, the chamfering effect cannot be expected, and if the chamfered portion is larger than 0.3 mm, a part of the slider may be caught in the above-mentioned interval W1.

FIG. 5 shows a main part of a control system of the magnetic disk device 1, and a control part 21 for controlling the whole.
In addition, a disk drive unit 2 that rotationally drives the magnetic disk 2
2, the coil 12 of the voice coil motor 4, the head processing unit 23 for writing and reading drive of the slider 6, the first plunger 8 and the second plunger 10 are connected.

Next, the rotating operation of the load arm 5 and the slider 6 in the magnetic disk device 1 will be described with reference to FIGS. 6 to 8. 6 to 8 are views of the slider and the like as seen from the direction of arrows BB. When the rotation of the magnetic disk 2 is stopped, a current is applied to the coil 12 by the control unit 21 in a direction to move the slider 6 to the outside, and the first plunger pin 9 of the first plunger 8 is set to the projecting state. The first plunger pin 9 is engaged with the inner end of the bobbin 13 as shown in FIG. As a result, the bobbin 13 and the load arm 5 are positioned at the contact start / stop positions. At this time, the rotation of the magnetic disk 2 is stopped.

Next, the controller 21 causes the first plunger pin 9 of the first plunger 8 to be retracted, and the second plunger pin 9 is retracted.
The second plunger pin 11 of the plunger 10 is set in the protruding state, and a current is passed through the coil 12 in the direction to move the slider 6 to the outside by the controller 21.
The load arm 5 and the slider 6 move outward from the contact start / stop position, and the load arm 5 and the slider 6 move from 0.05 mm to 0.3 mm.
The head surface of the slider 6 is in a state of being supported by the slider retracting portion 7a by smoothly overcoming the chamfered portions 2a and 7a of mm. In this state, as shown in FIG.
The outer end of the abutment is brought into contact with the outer stopper 14.

In this state, the control section 21 causes the first plunger pin 9 of the first plunger 8 to project as shown in FIG. 6, and engages the first plunger pin 9 with the engaging recess 13a of the bobbin 13. To combine. As a result, the bobbin 13 is fixed in the retracted position by the first plunger pin 9 and the outer stopper 14, and the load arm 5 and the slider 6 are positioned in the states shown in FIGS. 1 and 6. Thus, the withdrawal of the slider 6 is completed.

When the rotation of the magnetic disk 2 is started, the control unit 2 is first operated while the rotation of the magnetic disk 2 is stopped.
1 by the first plunger pin 9 of the first plunger 8
Is set in the retracted state as shown in FIG. 7, the second plunger pin 11 of the second plunger 10 is set in the projected state as shown in FIG.
An electric current is passed through the coil 12 in the direction of moving inward. As a result, the load arm 5 and the slider 6 move inward, and the outer end of the bobbin 13 is moved to the second plunger pin 11.
The load arm 5 and the slider 6 are positioned at the contact start / stop positions.

In this state, the magnetic disk 2 is activated.
When the magnetic disk 2 starts to rotate, the controller 21
As shown in FIG. 8, the first plunger pin 9 of the first plunger 8 is in a protruding state, and the second plunger 10 of the second plunger 10 is in the second state.
The plunger pin 11 of is brought into a retracted state. As a result, the slider 6 can freely slide on the magnetic disk 2 to write and read data. At this time, by making the first plunger pin 9 project, the runaway of the slider 6 can be prevented.

According to the magnetic disk device 1 having the above-described structure, the slider retracting portion 7a having a thickness equivalent to that of the magnetic disk 2 is provided as a head retracting mechanism in the vicinity of the outer periphery of the magnetic disk 2 and in the extension area thereof. Since the slider 6 is provided, the slider 6 is not lifted vertically from the surface of the magnetic disk 2 during the retracting operation, and is moved from the contact start / stop position to the slider retracting portion 7a side parallel to the magnetic disk surface in the extension area of the magnetic disk 2. The slider 6 can be retracted only by moving. Therefore, the distance between the magnetic disks 2 and the total thickness of the magnetic disk device 1 itself can be reduced as compared with the conventional example.

Further, the slider retreat portion 7a is made of the same material as the magnetic disk 2 or is made of a polymer material, particularly a polymer material including Teflon, so that even if an impact due to an earthquake or the like is applied at the time of retreat. It is possible to prevent the head surface of the slider 6 from being damaged.

Further, the chamfered portions 2a, 7 of 0.05 mm to 0.3 mm are provided at the outer peripheral end of the magnetic disk 2 and the end of the slider retracting portion 7a facing the outer peripheral of the magnetic disk 2.
By providing a, the slider 6 and the load arm 5 can be moved smoothly during the retracting operation.

The present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the invention.

[0029]

According to the present invention described in detail above, since it has the above-mentioned configuration, it is possible to reduce the distance between the magnetic disks and the overall thickness of the magnetic disk device itself as compared with the conventional example. A head retracting mechanism for the device can be provided.

Further, according to the present invention, the slider retreat portion is made of the same material as the magnetic disk or is made of a polymer material, particularly a polymer material containing Teflon, so that the slider is relieved by an impact such as an earthquake at the time of retreat. It is possible to effectively prevent the lower surface of the substrate from being damaged.

Further, according to the present invention, the chamfered portion of 0.05 mm to 0.3 mm is provided at the outer peripheral end of the magnetic disk and the end of the slider retreat portion facing the outer periphery of the magnetic disk, whereby the retreat is performed. The slider can be moved smoothly during operation.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG.

FIG. 3 is a partially enlarged view of the device of this embodiment.

FIG. 4 is an enlarged partial cross-sectional view of a magnetic disk and a slider retracting portion of the apparatus of this embodiment.

FIG. 5 is a block diagram of a control system of the apparatus of this embodiment.

FIG. 6 is a diagram for explaining the operation of the device of this embodiment.

FIG. 7 is an explanatory diagram of the operation of the device of this embodiment.

FIG. 8 is an explanatory diagram of the operation of the device of this embodiment.

FIG. 9 is a schematic view of a conventional magnetic disk device.

[Explanation of symbols]

 1 magnetic disk device 2 magnetic disk 3 spindle 4 voice coil motor 5 load arm 6 slider 6a magnetic head 7 retreat part 7a slider retreat part

Claims (5)

[Claims] 1. A magnetic disk which is rotationally driven, a load arm which is rotatably supported by a support shaft arranged in an outer region of the magnetic disk and moves along a magnetic disk surface, and a load arm which is supported by the load arm. A head retracting mechanism used in a magnetic disk device having a slider for writing and reading magnetic information in contact with or in close proximity to the surface of the magnetic disk, wherein the magnetic field is provided near the outer periphery of the magnetic disk and in an extension area thereof. A head retracting mechanism for a magnetic disk device, wherein a slider retracting portion having a thickness equivalent to that of the disk is provided. 2. The head retracting mechanism for a magnetic disk drive according to claim 1, wherein the slider retracting portion is made of the same material as the magnetic disk. 3. The head retracting mechanism for a magnetic disk drive according to claim 1, wherein the slider retracting portion is made of a polymer material. 4. The head retracting mechanism for a magnetic disk drive according to claim 1, wherein the slider retracting portion is a polymer material containing Teflon. 5. An outer peripheral end of the magnetic disk and an end of a slider retreat facing the outer circumference of the magnetic disk,
The head retracting mechanism for a magnetic disk device according to claim 1, 2, 3, or 4, wherein a chamfered portion of 0.05 mm to 0.3 mm is provided.