JP2007242084A - Head holder attachment and detachment mechanism, magnetic head tester and magnetic disk tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head holder attachment and detachment mechanism for easily switching a magnetic head (head assembly), and to provide a magnetic head tester and a magnetic disk tester capable of improving the throughput of inspection. <P>SOLUTION: In the head holder attachment and detachment mechanism 10, a head holder support plate 1 having a clip mechanism 2 is provided between a head holder and a head carriage supporting the head holder so as to be able to be easily attached and detached, and the head holder is fixed to a front end side of the head holder support plate 1. The head holder support plate 1 is overlapped upon an arm of the head carriage or a mounting pedestal, sandwiched vertically by rotation force from both sides by a roller, pressing the arm or the mounting pedestal and fixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a head holder attaching / detaching mechanism, a magnetic head tester, and a magnetic disk tester, and more particularly, a head holder attaching / detaching mechanism in which a magnetic head (head assembly) can be easily replaced and a magnetic head capable of improving inspection throughput. The present invention relates to a tester and a magnetic disk tester.

In recent years, the track width has been narrowed along with the improvement of the recording density in the magnetic disk apparatus. For this reason, the magnetic head tester or the magnetic disk tester is required to further improve the head positioning accuracy. In addition, the rotational speed of the disk is changed from 5400 rpm to 7000 rpm to 15000 rpm, and a disk with a higher rotational speed is now in practical use.
For this reason, Japanese Patent Application Laid-Open No. 2003-272326 “Applied by the applicant as an invention for maintaining an ON track state by providing a piezo actuator between the suspension spring and the head carriage and driving the piezo actuator according to a servo signal. There is a magnetic head tester, a magnetic disk tester, and a head cartridge used in these devices (Patent Document 1).
In the invention described in Patent Document 1, when a head positioned on a predetermined track is accessed, the head cartridge having a low mass is dynamically moved according to a servo signal, or the head cartridge is moved inside the head cartridge. The head assembly (suspension spring + head) is rotated and moved dynamically according to the servo signal to compensate for the deviation of the head from the track center so that the head is in the ON track state. Servo control.
JP 2003-272326 A

The actual size of the HDD head assembly in recent years is about 15 mm to 20 mm for a disk of 1.8 inches or less, and the size of the magnetic head provided at the tip of the suspension spring is also about 0.5 mm square. , Less than that, very small. Moreover, the distance between the magnetic head and the magnetic disk approaches 10 to several tens of nm, and this type of head assembly is mounted on the head carriage via the head holder.
In the magnetic head tester and the magnetic disk tester, the magnetic head often needs to be replaced. Under the above conditions, the magnetic head is replaced in units of head assemblies. Therefore, when replacing the head assembly, an accident that damages the magnetic head is likely to occur, and the magnetic head must be replaced carefully. For this reason, there is a problem that the throughput of inspection decreases.

In view of this, it has been considered that the head holder is provided with a connector and is attached to the head carriage in the form of a head cartridge, and the head cartridge is removed from the head carriage to replace the head assembly. That is the head cartridge. However, when the head cartridge is actually attached to and detached from the head carriage, the positioning accuracy between the head carriage and the head carriage is lowered due to the mounting play. For this reason, inspection with high accuracy cannot be expected. In addition, a highly accurate structure is required for the head cartridge mounting mechanism, and it is difficult to devise a mounting mechanism that can withstand the mounting and dismounting of the head cartridge with respect to the head carriage many times.
An object of the present invention is to solve such problems of the prior art and to provide a head holder attaching / detaching mechanism in which a magnetic head (head assembly) can be easily replaced.
Another object of the present invention is to provide a magnetic head tester and a magnetic disk tester capable of easily exchanging a magnetic head (head assembly) and improving the inspection throughput.

The head holder attaching / detaching mechanism, magnetic head tester, and magnetic disk tester according to the present invention that achieves such an object are characterized in that they are provided between the head holder to which the head assembly is fixed and the head carriage, and the head holder is fixed to the tip side. And a clip mechanism provided on the head holder support plate behind the tip side,
The clip mechanism includes two levers, a roller, and an urging member. The two levers are arranged at a predetermined interval in a direction crossing the head holder support plate and project in a direction to stand up with respect to the plane of the head holder support plate. The rollers are provided on the leading ends of these levers, and the urging member is provided with two levers so that these rollers can rotate in a direction approaching each other. When the head holder support plate is superimposed on the arm or mounting base of the head carriage, the rollers approach each other due to the biasing force of the biasing member, and are opposite to the overlapping surface of the arm or mounting base. The head holder support plate is fixed to the arm or mounting base by engaging and pressing the surface of the arm or mounting base on the side. A.

Thus, according to the present invention, the head holder support plate having the clip mechanism is provided between the head holder and the head carriage that supports the head holder so as to be easily attached and detached, and the head holder is fixed to the distal end side thereof.
The head holder support plate is overlapped with the arm or mounting base of the head carriage, and is fixed by pressing the arm or mounting base in the vertical direction by sandwiching it up and down by the turning force from both sides by rollers. As a result, both sides and the vertical direction are closely positioned with high accuracy, and the head holder can be supported on the head carriage via the head holder attaching / detaching mechanism of the present invention.
Since the head holder attaching / detaching mechanism according to the present invention is a clip mechanism, when removing the head holder support plate, the rollers are rotated in the opposite direction so that the distance between the rollers approaching each other is increased. The head holder support plate (head holder attaching / detaching mechanism) can be removed simply by releasing the engagement. If the head holder support plate is removed from the arm or the mounting base, a small head assembly can be easily removed from the head holder.
In addition, if a head assembly clamp mechanism (hereinafter referred to as a head clamp mechanism) in which the head assembly can be attached to and detached from the head holder is provided, the attachment and detachment of the head assembly is further facilitated.
In addition, a plurality of rollers are provided on each lever along the axial direction of the head holder support plate, and both end surfaces of the opposite surface to the overlapping surface of the head carriage arm or mounting base are chamfered. If a plurality of rollers are respectively engaged with the chamfered end faces, high mounting accuracy can be secured.
As a result, a head holder attaching / detaching mechanism in which the magnetic head (head assembly) can be easily replaced can be realized, and the magnetic head tester and the magnetic disk tester can improve the inspection throughput by easily replacing the magnetic head (head assembly). be able to.

FIG. 1 is a front view (FIG. 1 (a)) and a plan view (FIG. 1 (b)) of a head holder attaching / detaching mechanism of an embodiment to which the head holder attaching / detaching mechanism of the present invention is applied, and FIG. FIG. 3 is a side view of the head holder attached thereto, FIG. 4 is a front view of the head holder attaching / detaching mechanism removed from the head carriage, and FIG. 5 is a head view of the head holder attached side. It is a top view centering on the head arm of a carriage.
1 (a) and 1 (b), 10 is a head holder attaching / detaching mechanism, 1 is a head holder supporting plate, 2 is a clip mechanism provided on the head holder supporting plate, 3 is a lever, 4 is attached. The bias spring / lever support block 5 includes two rollers (see FIG. 3) provided on both sides, 6 is a through shaft that passes through the lever 3 and serves as a rotating shaft thereof, and 7 is a coil spring (biasing member). 8a to 8e are positioning holes provided in the head holder support plate into which positioning pins are inserted, 9a is a head holder mounting hole, and 9b is a positioning guide hole. The positioning holes 8a and 8d are elliptical positioning guide holes.

As shown in the plan view of FIG. 1B, the head holder support plate 1 has a head holder mounting portion 1a at the tip, a clip mechanism fixing portion 1b at the center, and a rear positioning pin insertion portion 1c at the rear end. In the center portion, there is a notch portion 1d in which both sides are cut into a rectangle.
The head holder mounting portion 1a is provided with a head holder mounting hole 9a and its positioning guide hole 9b. The clip mechanism fixing portion 1b is provided with an urging spring / lever support block 4, and the clip mechanism fixing portion 1b Positioning holes 8a to 8c are provided on the front end side, and positioning holes 8d and 8e are provided on the rear positioning pin insertion portion 1c, respectively. These positioning holes are provided on the arm (or mounting base) 11 (see FIG. 5) side of the head carriage 12. The positioning pins 11a to 11e thus fitted are respectively fitted to position the head holder support plate 1.

As shown in FIGS. 1 and 3, the urging spring / lever support block 4 is a block fixed on the head holder support plate 1, and a flat plate block 4c made of aluminum is provided at the lower stage. In addition, a convex shape is formed in which an aluminum prism block 4d is overlaid thereon. The plate block 4c has through-shafts 6 and 6, which are the center of rotation of the lever 3, fixed to the bottoms of both end portions in the direction crossing the head holder support plate 1, and passes through the lever 3 to the left and right sides. It is inserted. Thereby, the plate block 4c supports the lever 3 through the through shaft 6 so as to be rotatable.
On the other hand, the coil springs 7 and 7 are inserted in a compressed state between the spring insertion holes 4a provided in the prismatic block 4d and the corresponding insertion holes 3a provided in the lever 3, so that the plate block 4c. A repulsive force is generated in the lever 3 in the direction crossing the head holder support plate 1.

As a result, the levers 3 and 3 provided at both end portions protrude up and down on both sides of the head holder support plate 1 in a direction to stand up with respect to the plane of the head holder support plate, and are provided on the head holder support plate 1. It fits in the notches 1d and 1d, and is pivotally supported by the through shafts 6 and 6, respectively. The levers 3 and 3 are urged to rotate outwardly by the coil springs 7 and 7 respectively, and are urged to rotate in a direction in which the rollers 5 on the front end side approach each other. It rotates along a vertical plane that crosses the plane of the support plate 1.
As shown in FIG. 3, the levers 3 and 3 have a width in the axial direction of the head holder support plate 1, and each of the levers 3 has two rollers 5 and 5 inserted before and after the tip side 3b. The arm (or mounting base) 11 is engaged with a predetermined width. The rear end portions of the levers 3 and 3 are bent portions 3 c and 3 c that are bent outward, and the rear end portions 3 d and 3 d ahead of the levers 3 and 3 serve as roller opening / closing operation portions of the clip mechanism 2.

The distance W (see FIG. 1B) between the notch 1d and the notch 1d of the head holder support plate 1 is equal to or larger than the width of the arm (or mounting base) 11, and the lever 3 is In a state perpendicular to the surface of the head holder support plate 1, the head holder support plate 1 is disposed at a position where it does not contact the side surface with a gap between the arm (or mounting base) 11 and the side surface. Therefore, when the rollers 5 and 5 are energized and closed (the rollers 5 are close to each other), the interval between the rollers 5 is smaller than the interval W.
Note that the lever 3, the notch 1 d, and the side surface of the notch 1 d are brought into contact with each other at the interval W and the rotation at the intermediate position is prevented, thereby preventing the lever 3 from rotating more than necessary. This facilitates the attachment / detachment operation of the head holder attaching / detaching mechanism 10.
Furthermore, by making the interval W slightly wider than the interval between the arms (or mounting bases) 11, the head holder support plate 1 can be used for fixing and positioning with respect to the arms (or mounting bases) 11. The attachment and removal of the support plate 1 are facilitated.
The distance D between the lower surface 1e of the head holder support plate 1 (see FIGS. 1 (a) and 2) and the outer peripheral surfaces of the rollers 5 and 5 is the rotation to the inside of the lever 3 (direction approaching each other). In order to make this possible, the thickness of the arm (or mounting base) 11 is slightly larger than the thickness.
Accordingly, the rollers 5 biased by the coil springs 7 and 7 can be rotated so as to approach each other and engage both sides of the arm (or mounting base) 11 and the back side. The head holder support plate 1 and the arm (or mounting base) 11 of the head carriage are coupled via the clip mechanism 2. This will be described later.
As a result, as shown in the side view of FIG. 3, the head holder 120, the head holder support plate 1, and the arm (or mounting base) 11 of the head carriage are coupled.
As shown in the side view of FIG. 3, the arm (or mounting base) 11 of the head carriage 12 is provided with a chamfering engagement surface 11f having chamfered both ends of the lower surface. The rollers 5 and 5 engage with the inclined chamfering engagement surface 11f, thereby applying an oblique force to the arm (or mounting base) 11 to fix the head holder support plate 1 with high positioning accuracy. .
3 is an operation lever for fixing / releasing the head assembly in the head clamp mechanism 14 that attaches and detaches the head assembly 13 to and from the head holder 120.

FIG. 2 is a plan view showing the relationship between the head holder and the head holder attaching / detaching mechanism, and is a view seen from the head assembly mounting side (from the lower side to the upper side) for convenience of explanation of the head assembly. The head holder support plate 1 is indicated by a two-dot chain line.
The head holder 120 is composed of two blocks, a first block 121 and a second block 122, made of SUS (stainless steel). As shown in FIG. 4, the first block 121 has a head clamp mechanism 14 attached to the lower surface thereof, and supports the head assembly 13 via the head clamp mechanism 14. 13a is a head and 13b is a suspension spring.
The second block 122 is a block attached to the head holder support plate 1 for embedding and fixing the piezo actuator 15 as shown in a partially cutaway sectional view.
The two blocks of the first block 121 and the second block 122 are substantially equal in thickness and width, are arranged at a predetermined interval, and are a single thin coupling path (first) having a width of about 1 mm when viewed from the plane. The support part 123a of the block 121) is connected to the rear end side of the two blocks and is coupled by a curved connection path (auxiliary support part of the first block 121) 123b that supports the first block 121 so that it can rotate. ing.
In FIG. 2, FIG. 1 is enlarged and the coupling path 123 a and the connection path 123 b are slightly exaggerated. The connection path 123b allows a slight rotation (swing) of the coupling path 123a due to its curved state.
The coupling path 123a and the connection path 123b are cut out by cutting a groove of about 1 mm from one block together with the first block 121 and the second block 122. In FIG. Although the space between the blocks and the curved portion are shown slightly exaggerated, the lengths of the first block 121 and the second block 122 are almost the same, and the coupling path 123a is narrow as viewed from the plane. The head assembly fixing block 2 can be supported in a swung state with respect to the support block 3 by bending.

As shown in FIG. 2, the piezo actuator 15 is inserted into a hole 124 provided on the rear end side of the first block 121 opposite to the front end side to which the head assembly 13 is attached with the coupling path 123a interposed therebetween. Then, it is embedded and fixed in the hole 124 via the fixing bracket 125.
The drive surface on which the piezo actuator 15 advances and retreats is integrated with the first block 121 by being screwed with a foot portion of a screw 126 screwed and embedded at a corresponding position of the first block 121. A knob 126a is provided at the head of the screw 126, and a hole through which the terminal 15a of the piezo actuator 15 passes is provided in the fixing bracket 125.
As a result, when the piezo actuator 15 is driven, the screw 126 advances and retreats accordingly, and the first block 121 moves to the left and right in the drawing via the screw 126, and the flexible coupling is performed according to this left and right movement. The path 123a bends, and the first block 121 rotates minutely (swings) as indicated by an arrow on the lower side of the drawing in FIG. As a result, the head assembly 13 rotates, and the head 13a on the tip side thereof dynamically performs a minute movement operation in a direction crossing a track of a magnetic disk (not shown).
At this time, the connection path 123b may be provided according to the width and depth of the coupling path 123a and the weight of the first block 121, and is not necessarily required for the rotation of the head. Further, by turning the knob 1261a of the screw 126, the advancing / retreating drive surface of the piezo actuator 5 and the screw 21 can be brought into close contact with each other, and these can be coupled and fixed.

As shown in FIGS. 3 and 5, the second block 122 is screwed by a screw 128 via a screwing screw hole 127 provided on the upper surface of the second block 122 and a head holder mounting hole 9 a of the head holder support plate 11. These are integrated by being fixed. A positioning pin 129 (see FIG. 5) is provided in the second block 122 adjacent to the screwing screw hole 127, and when these are integrated, the pin 129 is fitted into the positioning guide hole 9b. To do.
As a result, the head assembly 13, the head clamp mechanism 14, and the piezo actuator 15 are arranged on both sides of the attachment position of the head holder support plate 1 with the screw 129, and these are arranged with a good weight balance. Is supported by the head holder support plate 1 in a balanced state, and the head positioning accuracy can be improved.
Further, since the second block 122 is configured to rotatably support the first block 121 by the coupling path 123a, it is not necessary to support the first block 121 with a special rotating mechanism. In addition, the only block to be rotated is the first block 121, and the first block 121 is a block for fixing the head assembly 13, and can be made small. Thereby, reduction of the mass of a rotation part can be aimed at.

Attachment and removal of the head holder attaching / detaching mechanism 10 to / from the head carriage 12 will be described.
The head holder attaching / detaching mechanism 10 is attached to the head carriage 12 by coupling the head holder supporting plate 1 and the head carriage arm (or mounting base) 11 via the clip mechanism 2. In this connection, the rear end portions 3d and 3d of the levers 3 and 3 are pinched with fingers to open the rollers 5 and 5 at the front end portion, hold the head holder support plate 1, and connect the plate positioning mounting hole 4b to the head carriage. After being fitted to positioning pins 11 a to 11 e provided on the arm (or mounting base) 11, the head holder support plate 1 is overlaid on the arm (or mounting base) 11 of the head carriage and the levers 3 and 3 are placed behind. The ends 3d and 3d may be separated. FIG. 5 is an explanatory plan view showing this state.
In FIG. 5, 12 is a head carriage, 12a is a moving table, 12b is a guide frame of the moving table, and an arm (or mounting base) 11 is fixed to the moving table 12a.
When the rear end portions 3d and 3d of the levers 3 and 3 are released, the rollers 5 and 5 are urged in the closing direction (the direction in which the rollers approach each other) by the coil springs 7 and 7 to the rollers 5 and 5. The head holder support plate 1 is forcibly pressed against the arm (or mounting base) 11 from the side and in the vertical direction by the rotational force applied, and then the head holder support plate 1 is pressed against the arm (or mounting base) 11 by the roller 5. , 5 and is fixed.
As described above, the rollers 5 and 5 are engaged with the chamfering engagement surface 11f of FIG. 3, whereby an oblique force is applied to the arm (or mounting base) 11 to thereby apply the head holder support plate 1. Is fixed with high positioning accuracy.

When detaching the head holder attaching / detaching mechanism 10 from the head carriage 12, the rear ends 3d, 3d of the levers 3, 3 are pinched with fingers and the rollers 5, 5 at the front end are made larger than the width of the arm (or mounting base) 11. It is only necessary to open and lift the head holder support plate 1 via the clip mechanism 2.
FIG. 4 shows a state of the removed head holder attaching / detaching mechanism 10.
In FIG. 4, the head assembly 13 (magnetic head) is exchanged by using the head clamp mechanism 14 in the removed state. In order to replace the head assembly 13, the head assembly 13 can be safely and easily removed by rotating the operating lever 14a provided on the head clamp mechanism 14 about 10 degrees clockwise as shown in FIG. it can.
The operation lever 14a for fixing / releasing the head assembly is fixed inside a rectangular hole groove provided in common to the first block 121 and the head clamp mechanism 14, and is supported so that the tip side is rotated by a bearing. The head assembly fixing / releasing operation lever bar 14a extends to the lower side of the bearing to loosen the leaf spring, so that the head assembly fixing / releasing operation lever bar 14a moves to the right side of the drawing at the position of the dotted line. Then, the loose head assembly 13 is opened, and the head assembly fixing / releasing operation lever 14a is engaged at the position of the solid line, and the block 14b is moved to the left side of the drawing to fix the head assembly 13.
The new head assembly 13 (magnetic head) is attached by turning the head holder attaching / detaching mechanism 10 in the state shown in FIG. Conversely, the operation lever 14a is returned to the solid line position.
As a result, a head holder attaching / detaching mechanism in which the magnetic head can be easily replaced can be realized, and in particular, the inspection throughput can be improved in the magnetic head tester.

In this embodiment, positioning with respect to the arm (or mounting base) 11 of the head holder support plate 1 is performed by engagement of the positioning pins 11a to 11e and the positioning holes 8a to 8e, but the positioning pins 11a to 11e and the positioning holes One pivot may be provided for 8a to 8e. Further, since the levers 3 and 3 are provided on both sides, the positioning by the rotation of the levers 3 and 3 is also possible, so that positioning pins and positioning holes are not necessarily required.
In this embodiment, each lever 3 is provided with two (a plurality of) rollers 5 so as to be engaged with each other. However, in the present invention, the roller 5 itself has a width. Of course, one roller 5 may be provided.
In the embodiment, the coil spring is used as the biasing member. However, the biasing member is not limited to the coil spring, and the position thereof is not limited to being provided above the rotation center of the lever 3. In addition, when providing a coil spring below the rotation center of the lever 3, it will provide in a tension | pulling state.

As described above, in the embodiment, the driving surface of the piezo actuator and the first block are integrated. However, since the flexible coupling path is bent, there is a return force. Thus, in a mechanism in which the first block is moved back to the left or right only in the drawing and returned, it is not always necessary to integrate the drive surface of the piezoelectric actuator and the first block.
In the embodiment, the magnetic disk tester is mainly described as an example, but the present invention can be applied to a magnetic head tester.

FIG. 1 shows a head holder attaching / detaching mechanism according to an embodiment to which the head holder attaching / detaching mechanism of the present invention is applied. FIG. 1 (a) is a front view thereof, and FIG. 1 (b) is a plan view thereof. FIG. 2 is a plan view of the head holder as viewed from the back side (head assembly mounting side). FIG. 3 is a side view with the head holder attached. FIG. 4 is a front view of the head holder attaching / detaching mechanism removed from the head carriage. FIG. 5 is a plan view centering on the head arm of the head carriage.

Explanation of symbols

1 ... head holder support plate, 2 ... clip mechanism,
3 ... Lever, 4 ... Biasing spring / lever support block,
5 ... roller, 6 ... shaft pin, 7 ... coil spring (biasing member),
8: Plate positioning mounting hole,
9a: Head holder mounting hole, 9b: Positioning guide hole,
10 is a head holder attaching / detaching mechanism,
11: Arm (or mounting base) of the head carriage,
12 ... head carriage,
13 ... Head assembly,
14 ... Head clamp mechanism, 15 ... Piezo actuator,
120 ... head holder,
121 ... 1st block, 122 ... 2nd block,
123a ... connection path, 123b ... connection path, 124 ... hole,
125 ... fixing bracket, 126 ... screw.

Claims (8)

A head holder attaching / detaching mechanism in a head carriage mechanism comprising a head assembly, a head holder for holding the head assembly, and a plate-like arm or mounting base provided on a head carriage for supporting the head holder,
A head holder support plate provided between the head holder and the head carriage and having the head holder fixed on the tip side; and a clip mechanism provided on the head holder support plate behind the tip side. ,
The clip mechanism includes two levers, a roller, and an urging member, and the two levers are arranged at a predetermined interval in a direction transverse to the head holder support plate and stand up with respect to the plane of the head holder support plate. The roller is provided on the tip side of each lever, and the urging member is rotated in the direction in which these rollers approach each other. The two levers are biased to each other, and when the head holder support plate is overlaid on the arm or the mounting base, the rollers approach each other by the biasing of the biasing member. Alternatively, the head holder can be formed by engaging and pressing the arm or the surface of the mounting base opposite to the surface of the mounting base. Head holder detachment mechanism for fixing the lifting plate to the arm or the mounting base.   The roller is provided in each of a plurality of levers along the axial direction of the head holder support plate, and both end surfaces of the back surface are chamfered, and the plurality of rollers are engaged with the chamfered surfaces, respectively. The head holder attaching / detaching mechanism according to claim 1.   Either the positioning pin or the positioning hole is provided on the overlapping surface of the arm or the mounting base, and the positioning pin or the positioning hole is formed on the surface of the head holder support plate that is overlaid on the overlapping surface. 3. The head holder attaching / detaching mechanism according to claim 1, wherein one of the other is provided, and the positioning pin and the positioning hole are fitted to overlap the head holder supporting plate and the arm or the mounting base.   The two levers are erected in an up-down direction with respect to the plane of the head holder support plate, and each center of rotation is supported by the head holder support plate and provided in the middle of the lever. 4. The head holder attaching / detaching mechanism according to claim 3, wherein an end portion of the lever on the opposite side serves as an opening / closing operation portion of the roller, and a lower surface of the head holder is provided with a clamp mechanism for attaching / detaching the head assembly.   The head holder includes a first block to which the head assembly is fixed and a second block in which the actuator is provided to drive the first block forward and backward. The first block and the first block The second block is connected to the second block by a flexible coupling path, and the actuator rotates the first block with respect to the second block around the position of the coupling path. Item 2. A head holder attaching / detaching mechanism according to Item 1.   The actuator is a piezo actuator, and the head assembly and the piezo actuator are provided on opposite sides of the coupling path, and the head assembly rotates when the piezo actuator advances and retracts the first block. The head holder attaching / detaching mechanism according to claim 5.   7. A head holder attaching / detaching mechanism according to claim 1, the head carriage mechanism, a spindle, and a magnetic disk mounted on the spindle, and fixed to the head assembly with respect to the magnetic disk. A magnetic head tester for inspecting the read / write characteristics of a magnetic head.   The head holder attaching / detaching mechanism according to claim 1, the head carriage mechanism, a spindle, and a magnetic disk mounted on the spindle, and inspecting electrical characteristics of the magnetic disk. Magnetic disk tester.

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