JP5383566B2 - Magnetic head loading device and inspection device - Google Patents

Description

  The present invention relates to a magnetic head loading apparatus and an inspection apparatus for ramp loading a magnetic head when inspecting a magnetic disk or a magnetic head, and more particularly to a magnetic head assembly (including a magnetic head and a suspension spring) provided with a protrusion for ramp loading. The magnetic head loading device and the inspection device are capable of appropriately maintaining the load angle of the magnetic head assembly and easily exchanging the magnetic head assembly.

  A magnetic disk frequently used as an information recording medium and a magnetic head assembly for reading and writing data are subjected to precise performance inspections by respective inspection devices at the manufacturing stage. Recently, the density of magnetic disks has been increasing, and HDDs of the order of several hundred gigabytes have become mainstream. Also, the head loading mechanism has been improved, and instead of the contact start / stop (CSS) method, the magnetic head assembly is placed at the outer periphery of the magnetic disk and separated by a predetermined distance when the HDD is stopped or not accessed. A ramp loading type head loading mechanism is used which is held by a ramp (an inclined surface base) provided.

  In the ramp load system, an elastic suspension spring (or a gimbal spring) in which a projection portion for ramp loading is formed on the magnetic head assembly is provided. In this specification and claims, the magnetic head, the suspension spring, the magnetic head, and the gimbal spring are treated as the concept of the magnetic head assembly. The applicant has filed a head loading mechanism for directly loading a magnetic disk using a ramp load type magnetic head assembly having protrusions, and this direct loading head loading mechanism is currently used (patent). Reference 1).

JP 2002-251856 A

  The head loading mechanism disclosed in Patent Document 1 is moved up and down slightly to a predetermined angle in the unloaded state by the vertical rotation mechanism to retract, and in the loaded state, the load bar is moved a predetermined distance from the magnetic disk. And the magnetic head is loaded onto the magnetic disk. On the other hand, when replacing the magnetic head assembly, the load bar is largely retracted so that the replacement can be easily performed. Also, since the load bar position needs to be finely adjusted in the load state, the distance from the rotary shaft to the adjustment mechanism of the vertical rotation mechanism must be several times the distance from the rotary shaft to the load bar. It is necessary to increase the rotation angle to ensure workability. Therefore, since the above-described loading mechanism needs to have a large operation area, it has a problem that it is not suitable for mounting around a dense head.

  The object of the present invention has been made in view of the above points, and it is possible to easily replace a magnetic head assembly in which a protrusion for ramp loading a magnetic head is formed even in a dense head periphery. It is an object of the present invention to provide a head loading device and an inspection device.

A first feature of the magnetic head loading device according to the present invention is that a load bar means is engaged with a protrusion provided at the tip of the magnetic head assembly means so that the magnetic head portion of the magnetic head assembly means is attached to the magnetic disk. In the magnetic head loading apparatus for setting the load / unload state, the load bar means is provided at one end portion, and the other end portion is driven up and down to rotate around a rotation axis, and the load bar means Load arm means for controlling the engagement state between the magnetic head assembly means and the projecting portion of the magnetic head assembly means to set the loading / unloading state of the magnetic head part, and the load arm means as a whole along the vertical direction. The magnetic head assembly means can be driven in the linear direction when replacing the magnetic head assembly means. The larger the a load arm holding means to retract the load bar, the load / unload state of the magnetic head unit by driving only the other end portion in the vertical direction of the load arm means than in the unloaded state by And driving means for driving the other end portion of the load arm means and simultaneously driving the load arm holding means in the linear direction to retract the load bar means largely. .
A projection for ramp loading is formed at the tip of the magnetic head assembly means. When the magnetic head assembly means is in an unloaded state with respect to the magnetic disk, the load bar means engages with the back surface of the protruding portion to prevent the magnetic head portion from descending toward the magnetic disk. On the other hand, when the magnetic head assembly means is in a loaded state with respect to the magnetic disk, the load bar means is located at a predetermined distance from the surface of the magnetic disk, and the magnetic head portion floats on the surface of the magnetic disk. The engagement between the load bar means and the rear surface of the protruding portion is released. When exchanging the magnetic head assembly means, the magnetic head assembly means and the magnetic head loading device should be largely retracted from the magnetic disk, and the load bar means should be retracted to a position away from the protruding portion to facilitate the replacement work. There is. Further, since it is necessary to minimize the friction between the protrusions of the magnetic head assembly means and the load bar means during the load / unload operation, it is desirable that the rotation mechanism approximate the movement of the magnetic head assembly means. The operation is less likely to be such a rotating mechanism. Therefore, in the present invention, the load arm means for performing the load / unload operation by the rotation mechanism is mounted in the load arm holding means for moving to the retracted position. During the load / unload operation, the other end of the load arm means is driven independently in the vertical direction by the drive means, and when the load bar means is largely retracted, both the load arm means and the load arm holding means are driven by the same drive means. Drives continuously in a linear direction. Thus, it is possible to miniaturize the operating area by combining a linear motion of the rotational operation and the load arm holding means of the load arm means, and to realize a highly accurate magnetic head loading mechanism.

A second feature of the magnetic head loading device according to the present invention is the magnetic head loading device according to the first feature, wherein the load arm means and the load arm holding means are provided with a height adjusting screw means. A substantially U-shaped load mechanism base means formed so as to have a plate portion and a base portion fixed to the base at both ends, and a space between the top plate portion and the base portion along the linear direction. Linear guide means for sliding movement, load arm support block means mounted on the linear guide means, and first compression spring means for pressing the load arm support block means against the height adjustment screw means of the top plate portion The load arm is provided above one end of the load arm support block means, and is pushed down by the drive means to thereby form the load arm A first bearing means for slidingly moving the holding block means along the linear direction, and the load bar means at the tip, and rotating on one side surface of the load arm support block means about the rotation axis A load arm means provided on the one end of the load arm means, a second bearing means for rotating the load arm means by being pushed down by the drive means, and the load arm means The second compression spring means is configured to be biased in a direction opposite to the direction of rotation. This is a specific example of a mechanism for realizing the rotation operation of the load arm means and a mechanism for realizing the linear operation of the load arm holding means in correspondence with the embodiment.

  An inspection apparatus according to the present invention is to inspect a magnetic disk or a magnetic head using the magnetic head loading apparatus described in the first feature or the second feature. This is to inspect the magnetic disk or the magnetic head using any one of the magnetic head loading devices.

  According to the present invention, there is an effect that the replacement of the magnetic head assembly formed with the projection for ramp loading the magnetic head can be easily performed even in a dense head periphery.

It is a figure which shows the Example of the head loading mechanism of the test | inspection apparatus to which this invention is applied. It is a figure which shows the detailed structure of the load drive part and link mechanism part of FIG. It is a figure which shows the detailed structure of the load mechanism part and magnetic head assembly of FIG. It is a figure which shows the state of a magnetic head assembly when a magnetic head is loaded on the magnetic disk. FIG. 5 is a diagram illustrating a state where the load mechanism unit and the magnetic head assembly of FIG. 4 are retracted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same component is shown with the same code | symbol and those description is abbreviate | omitted. FIG. 1 is a diagram showing an embodiment of a head loading mechanism of an inspection apparatus to which the present invention is applied. FIG. 1A is a top view of the head loading mechanism as viewed from above, and FIG. 1B is a side view thereof.

  The magnetic disk 1 is mounted on the spindle 1a. The spindle 1a is coupled to the rotation shaft of the spindle motor 2 and is driven to rotate. The head loading mechanism 3 includes a load driving unit 4, a link mechanism unit 5, and a load mechanism unit 6. The head loading method for the magnetic disk 1 shown in FIG. 1 is an inline method in which the magnetic head assembly 7 is fixed by the head clamp table 36 in a direction along the circumference of the magnetic disk 1. As a head loading method for the magnetic disk 1, a linear method in which the direction of the magnetic head assembly 7 is the radial direction of the magnetic disk may be used. In either method, the configuration of the head loading mechanism itself is the same.

  FIG. 2 is a diagram illustrating a detailed configuration of the load driving unit and the link mechanism unit of FIG. 2A is a top view of the load driving unit and the link mechanism unit as viewed from above, and corresponds to FIG. 1A, FIG. 2B is a side view thereof, and FIG. Correspond. As shown on the left side of FIG. 2, the load drive unit 4 is attached to a mounting base 8 fixed to the base body 40, a motor 9 fixed by screwing to the mounting base 8, and a rotation shaft of the motor 9 to rotate. The cam 10 includes a dog 11 that operates during forced unloading, a mechanical stopper 12 for forced unloading, and three cam position detection sensors 13a to 13c. The load drive unit 4 performs drive stop control of the motor 9 in each of the loading, unloading, and retracting states of the magnetic head assembly 7 in accordance with output signals from the three cam position detection sensors 13a to 13c. Further, when the abnormality occurs, the dog 11 comes into contact with the mechanical stopper 12 so that the magnetic head assembly 7 is forcibly unloaded.

  As shown on the right side of FIG. 2, the link mechanism unit 5 includes a mounting base 14, a link bar rotating shaft 15, a link bar 16, a tension spring 17, and a cam follower 18. The link bar 16 is formed of a bar bent so as to extend in the horizontal direction with a predetermined step, and one of the bent portions is configured to match the ring bar rotating shaft 15. The link bar 16 has a cam follower 18 provided so as to be in constant contact with the cam 10 at the left end, and the load mechanism 6 is provided at the right end. A tension spring 17 is provided between the other bent portion of the link bar and the mounting base 8, and the cam follower 18 is always in contact with the cam 10 of the load driving unit 4 by the tension. Therefore, since the cam follower 18 moves along the shape of the cam 10, this moving operation is transmitted to the load mechanism section 6 via the link bar 16.

  FIG. 3 is a diagram showing a detailed configuration of the load mechanism and the magnetic head assembly of FIG. 3A is a top view of the load mechanism and the magnetic head assembly as viewed from above, corresponding to FIG. 1A, and FIG. 3B being a side view thereof, FIG. Correspond. As shown in FIG. 3, the magnetic head assembly 7 is fixed to the head clamp table 36 in the loaded state. As a result, the magnetic head assembly 7 is supported from the head clamp table 36 with a horizontal or small depression angle with respect to the surface of the magnetic disk 1 so that the magnetic head 34 floats on the magnetic disk 1 as shown in FIG. It has become. A load bar 19 is interposed between the protrusion 33 at the head end of the magnetic head assembly 7 and the magnetic disk 1 at a predetermined interval, and the load bar 19 comes into contact with the protrusion 33 at the head end and lifts the magnetic head 34. Is moved away from the magnetic disk 1 to be in an unloaded state.

  As shown in FIG. 3, the load mechanism unit 6 loads and unloads the magnetic head assembly 7 with respect to the surface of the magnetic disk 1 by the load bar 19, and retracts the load bar 19 when the magnetic head assembly 7 is replaced. I have. The load mechanism unit 6 includes a load mechanism base 20, a linear guide 21, a load arm support block 22, compression springs 23 and 24, an adjustment screw 25, a bearing 26, a load arm rotating shaft 27, a load arm 28, a load bar base 29, and a compression. A spring 30, an adjustment screw 31, and a bearing 32 are included.

  The load mechanism base 20 is substantially U-shaped, and a base portion 20b having a larger area than the top plate portion 20a is fixed to the base body 40, and an adjustment screw 25 is provided on the other top plate portion 20a. A linear guide 21 slidably movable in the vertical direction in FIG. 3B is provided in the space between the top plate portion 20a and the base portion 20b of the load mechanism base 20. A load arm support block 22 is attached to the linear guide 21. The load arm support block 22 is pressed against the adjusting screw 25 by compression springs 23 and 24 provided on both sides of the linear guide 21, and is configured to be slidable in the vertical direction along the linear guide 21. . A bearing 26 is mounted on the upper side of the left end portion of the load arm support block 22. When the link bar 16 is lowered in the direction of the arrow 3 a, the bearing 26 is pushed down, and accordingly, the load arm support block 22 performs a linear motion in the vertical direction along the linear guide 21.

  On one side surface of the load arm support block 22 (the lower side in FIG. 3A), a load arm 28 that rotates about the load arm rotation shaft 27 is mounted. The load bar base 29 and the load bar 19 are screwed to the tip of the load arm 28 (the tip in the right direction in FIG. 3). The load bar 19 and the load bar base 29 are bonded to form an integral structure. A compression spring 30 is provided between the lower side of the left end portion of the load arm 28 and the L-shaped projection flat portion 22 b formed at the lower left end portion of the load arm support block 22. The compression spring 30 is pressed against the L-shaped projection flat portion 22 b by an adjustment screw 31 provided via a projection flat portion 22 a formed on the left upper end portion of the load arm support block 22. A bearing 32 is attached to the left end portion of the load arm 28. When the link bar 16 is lowered in the direction of the arrow 3 a, the bearing 32 is pushed down before the bearing 26. That is, when the link bar 16 is lowered in the direction of the arrow 3a and comes into contact with the bearing 32, the bearing 32 is pushed down in the direction of the arrow 3b. To do.

  Since the link bar 16 is not in contact with both the bearing 26 and the bearing 32 in the loaded state, the load bar is positioned at the head end whose parallelism and height with the magnetic disk 1 are adjusted by the adjusting screw 25 and the adjusting screw 31. The protrusion 33 and the magnetic disk 1 are set so as to be approximately at an intermediate position of about 0.3 [mm]. By adjusting the load operation and the unload operation as the rotation operation and increasing the distance from the load arm rotation shaft 27 to the adjustment screw 31, the adjustment allowance is secured.

  In the unloaded state, the link bar 16 pushes only the bearing 32. As a result, the load arm 28 rotates about the load arm rotating shaft 27 in the direction of the arrow 3b, the load bar 19 lifts the protruding portion 33 at the tip of the head, and the magnetic head 34 moves 0.3 to 0. A distance of about 5 mm can be maintained.

  FIG. 5 is a diagram illustrating a state where the load mechanism unit and the magnetic head assembly of FIG. 4 are retracted. FIG. 5 (A) corresponds to FIG. 3 (A), FIG. 5 (B) is a side view thereof, and corresponds to FIG. 4 (B). In FIG. 5, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 5, in the retracted state, the link bar 16 keeps pushing the bearing 32 and further pushes down the bearing 26 in the direction of the arrow 3c. In FIG. 5, the load mechanism 6 and the magnetic head assembly 7 indicated by a two-dot chain line show a state before the bearing 32 is pushed down, and the load mechanism 6 and the magnetic head assembly 7 indicated by a solid line are pushed down in the direction of the arrow 3c. The state that has been displayed. As the link bar 16 pushes down both the bearing 26 and the bearing 32 in this way, both the load arm 28 and the load arm support block 22 move in the direction of the arrow 3c, and the load bar 19 is moved from the magnetic head assembly 7. Evacuate greatly. Since the retracting operation at this time is a linear operation, the operation stroke can be made smaller than in the case of retracting by a rotating operation as in the prior art. Further, by such a retracting operation, the magnetic head assembly 7 is supported only by the head clamp table 36, and the head replacement operation can be easily performed in this state. In the above-described embodiment, the head loading mechanism in the case of the in-line method has been described. However, the present invention can be similarly applied to a linear type head loading mechanism.

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk 2 ... Spindle motor 3 ... Head loading mechanism 4 ... Load mechanism part 5 ... Link mechanism part 6 ... Drive part 7 ... Magnetic head assembly 8 ... Mounting base 9 ... Motor 10 ... Cam 11 ... Dog 12 ... Mechanical stopper 13 ... Cam position detection sensor 14 ... Mounting base 15 ... Link bar rotating shaft 16 ... Link bar 17 ... Tension spring 18 ... Cam follower 19 ... Load bar 20 ... Load mechanism base 21 ... Linear guide 22 ... Load arm support block 23 ... Compression spring 24 ... Compression spring 25 ... Adjustment screw 26 ... Bearing 27 ... Load arm rotating shaft 28 ... Load arm 29 ... Load bar base 30 ... Compression spring 31 ... Adjustment screw 32 ... Bearing 33 ... Protruding portion 34 at head end ... Magnetic head 35 ... Suspension spring 36 ... Head clamp stand

Claims (3)

In a magnetic head loading device, wherein a load bar means is engaged with a protrusion provided at the tip of a magnetic head assembly means to set the magnetic head portion of the magnetic head assembly means to a load / unload state with respect to a magnetic disk.
The load bar means is provided at one end portion, and the other end portion is driven in the vertical direction to rotate around a rotation axis, and the engagement state between the load bar means and the protruding portion of the magnetic head assembly means is established. Load arm means for controlling and setting a load / unload state of the magnetic head unit;
The load arm means is held so as to be movable in a linear direction along the vertical direction, and when the magnetic head assembly means is replaced, it is driven in the linear direction so as to be larger than in the unload state. Load arm holding means for retracting the means;
The loading / unloading state of the magnetic head unit is set by driving only the other end portion of the load arm means in the vertical direction, and simultaneously holding the load arm while driving the other end portion of the load arm means. A magnetic head loading device comprising: driving means for retracting the load bar means largely by driving the means in the linear direction. The magnetic head loading device according to claim 1,
The load arm means and the load arm holding means are:
A substantially U-shaped load mechanism base means formed to have a top plate portion provided with a height adjusting screw means and a base portion fixed to the base at both ends;
Linear guide means for slidingly moving between the top plate portion and the base portion along the linear direction;
Load arm support block means mounted on the linear guide means;
First compression spring means for pressing the load arm support block means against the height adjustment screw means of the top plate portion;
A first bearing means provided above one end of the load arm support block means and slidably moving the load arm support block means along the linear direction by being pushed down by the drive means;
Load arm means having the load bar means at the tip, and provided on one side surface of the load arm support block means so as to rotate about a rotation axis;
A second bearing means provided on one end of the load arm means and rotating the load arm means by being pushed down by the drive means;
A magnetic head loading device comprising: a second compression spring means for urging the load arm means in a direction opposite to the direction of the rotation.   An inspection apparatus for inspecting a magnetic disk or a magnetic head using the magnetic head loading apparatus according to claim 1.

Images