JP2002298528A - Magnetic head loading mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positioning speed and accuracy of a magnetic head 22 in a swing arm type magnetic head loading mechanism. SOLUTION: A carriage 20 comprises an arm part 26, a main body 36 and a pedestal part 38. The arm part 26 has a head mounting block 28 that can be turned with a spindle 30 as a center, a suspension 24 is fixed to the head mounting block 28, and a magnetic head 22 is further fixed to the top end of the suspension 24. The arm part 26 is fixed to the main body 36, and the main body 36 has a loading control lever 32 for driving the head mounting block 28 and controlling the loading and unloading of the magnetic head 22. The main body part 36 is fixed onto the pedestal part 38. A stage 40 movable to/from a magnetic disk 12 has a carriage mounting part 44 for mounting the pedestal part 38 turnably and attachably/detachably. A motor for feeding motive power necessary for a loading and unloading control is provided in the stage 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing arm type magnetic head loading mechanism for mounting a magnetic head in a magnetic disk inspection apparatus used for inspecting a magnetic disk or a magnetic head. The present invention relates to a swing arm type magnetic head loading mechanism that reduces the weight of a carriage so as to improve accuracy. Also disclosed is a magnetic head loading mechanism that suppresses vibration during carriage replacement and reduces adverse effects on other carriages during inspection work.

[0002]

2. Description of the Related Art A magnetic disk device known as a hard disk of a personal computer or the like, in a manufacturing process, a magnetic disk and a magnetic head constituting the magnetic disk device are provided with
An inspection is performed to determine whether the quality is above a certain level. For such inspection, a dedicated magnetic disk inspection device is used. A magnetic disk inspection apparatus writes and reads out a predetermined signal from a blank (no signal is written) magnetic disk to be inspected using a magnetic head whose quality is already known to be reliable. Thus, the quality inspection of the magnetic disk to be inspected is performed. Conversely, the quality of the magnetic disk to be inspected is written to and read from the magnetic disk of which the quality is already known to be reliable by using the magnetic head to be inspected.

The magnetic disk inspection process is performed while rotating the magnetic disk with a spindle motor. If a defect, dust, or the like exists on the magnetic disk, a signal waveform that should be originally present in the read electrical signal is not included. Shows a different variation (irrelevant) part. Therefore, by analyzing the abnormal portion, it is possible to detect whether the defect is a magnetic defect or dust. Defects and dust detected in this way (hereinafter collectively referred to as points on the magnetic disk)
Is specified as a position on the magnetic disk and recorded as an inspection result. In this case, the position of the point on the magnetic disk is specified using the radius from the center of the magnetic disk and the sector number. The sectors in the magnetic disk inspection are different from those used in the actual hard disk medium device, and are obtained by dividing the disk medium at arbitrary equal angles according to the convenience of the inspection. FIG. 4 is a diagram showing an example of this. The magnetic disk 12 is divided into 1024 at equal angles, and 0000 to 1023 (the number is 10 Numbers) are sequentially assigned. As a result, for example, a magnetic defect has a sector number 0505 and a radius of 5.05.
The position of a point on the disk medium can be specified, for example, at a millimeter position.

As described above, since no signal is initially written on the blank magnetic disk to be inspected, no servo signal for servoing the magnetic head is written, of course. Therefore, it is not possible to guide the magnetic head to a desired position on the magnetic disk by reading the servo signal. Therefore, in order to accurately load the magnetic head to a desired position on the magnetic disk, it is necessary that the magnetic head can be accurately positioned only by the loading mechanism itself.

[0005] As a loading mechanism for such a magnetic disk inspection apparatus, a linear type has conventionally been widely used. This is because the linear type is easy to increase the positioning accuracy. Such a linear magnetic head loading mechanism is disclosed in, for example,
No. 6349. In the linear type, the head moving unit holding the magnetic head is supported by a linear bearing, and the feed screw is connected by a spindle motor to linearly move the linear bearing. The advantage of the linear type is that by using a highly accurate feed screw,
The point is that the positioning accuracy can be increased.

When a linear type magnetic head loading mechanism is used, the magnetic disk to be inspected is arranged so that the center of the magnetic disk is on a straight line on which the magnetic head moves. Therefore, in the linear type, the moving amount of the magnetic head and the moving amount in the radial direction on the magnetic disk have a linear relationship. Therefore, even when the magnetic head is moved to a position of an arbitrary radius and sector number on the magnetic disk, the amount of movement of the magnetic head can be easily calculated. In order to move the magnetic head to a position of an arbitrary sector number and access a desired point, the rotation of the spindle motor is controlled, and the signal read by the magnetic head and the angle from the reference line 79 are set. It is realized by.

However, in actual hard disk drives sold as products, since servo signals are recorded on a magnetic disk, a loading mechanism of a type that holds a magnetic head at the tip of a swing arm is mainly used. That is, a magnetic head is provided at the tip of a swing arm that swings in an arc shape about a rotation axis, thereby reading and writing data. It should be noted here that the skew angle of the magnetic head (the angle of the head with respect to the tangent of the disk) changes between the inner and outer tracks of the magnetic disk.

In consideration of the change in the skew angle, it is desirable that the inspection of the magnetic disk be performed using a swing arm type head loading mechanism as in the actual hard disk medium device. However, the swing arm type head loading mechanism has a drawback that it is more difficult to increase the mechanical accuracy than the linear type, and thus it is difficult to increase the positioning accuracy of the magnetic head.

FIG. 5 is a perspective view showing an example of a conventional swing arm type magnetic head loading mechanism. The magnetic disk 12 is fixed to the spindle motor 10 by a disk clamp 14 and rotated. The carriage 20 includes an arm 26, a motor 34, a main body 36, and a pedestal 38. The arm 26 has a head
A mounting block 28 is mounted for rotation about an axis 30. The suspension 24 is fixed to the head mounting block 28, and the magnetic head 22 is fixed to the tip of the suspension 24. A force is applied to the head mounting block 28 to push the suspension 24 downward by the elastic force of a spring (not shown). The loading control lever 32 on the main body 36 is connected to the head mounting block 2.
When the magnetic head 22 is pressed downward, the magnetic head 22 is unloaded from the magnetic disk 12. When the loading control lever 32 reduces the force of pressing the head mounting block 28 downward, the magnetic head 22 is loaded onto the magnetic disk 12. The motor 34 supplies control power for swinging the loading control lever 32 up and down. The arm 26 and the pedestal 28 are fixed to the main body 36. Furthermore, the main body 36
Is fixed on the base 38.

The pedestal portion 38 of the carriage 20 is rotatably and detachably mounted on a carriage mounting portion 44 of the stage 40. Since the carriage 20 is rotatable with respect to the stage 40, the magnetic disk 12 can be inspected while changing the skew angle of the magnetic head 22, as in the actual hard disk device. The stage 40 is slidably mounted on the linear guide 42. By moving the stage 40 linearly along the linear guide 42, the distance between the carriage 20 and the magnetic disk 12 can be adjusted. Although not shown, another one is symmetrical with respect to the magnetic disk 12.
There are two carriages and a stage. That is, the magnetic disk 12 is inspected simultaneously by a pair of carriages. This is to improve the inspection efficiency by performing a magnetic disk inspection with two magnetic heads. In addition, the stage 40 is the above-mentioned Japanese Patent Publication 6-1.
As described in Japanese Patent No. 6349, the motor can be moved along a guide by power from a stage driving motor (not shown).

The carriage 20 is detached from the stage 40 when the magnetic head 22 needs to be replaced even during the inspection of the magnetic disk, and is replaced as needed. This is because the carriage 20 needs to be replaced to replace the magnetic head 22.
While the magnetic head 22 and the suspension 26 are fixed.
This is because replacing the entire carriage 20 can be replaced in a shorter time than replacing the entire carriage 20, and as a result, the interruption of the magnetic disk inspection work can be shortened. Such exchanges have been made using mechanical mechanisms or all manually.

[0012]

There are several methods for increasing the positioning speed and accuracy of the magnetic head 22 with respect to the magnetic disk 12, and one of the methods is to reduce the weight of the carriage 20. Can be However, the arm 26 and the like are made of aluminum, and weight reduction has already been progressed. Then, the motor 34 is connected to the carriage 2
It is conceivable that it is removed from zero and arranged at another place, but in that case, how to supply the power for driving the loading control lever 32 becomes a problem.

Considering the replacement of the carriage 20 during the inspection work of the magnetic disk, it is desirable that vibrations are not generated as much as possible during the replacement operation. This is because, as described above, two (or more) carriages are often arranged on one linear guide in order to improve the work efficiency, so that if the carriages can be replaced without vibration, adverse effects on other carriages will occur. This is because it can be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head loading mechanism in which the weight of a carriage is reduced and the speed and accuracy of positioning a magnetic head with respect to a magnetic disk are improved. Another object of the present invention is to provide a magnetic head loading mechanism characterized in that the occurrence of vibration at the time of carriage replacement is reduced.

[0015]

SUMMARY OF THE INVENTION A magnetic head according to the present invention
The loading mechanism is used particularly in a magnetic disk inspection apparatus for inspecting a magnetic disk or a magnetic head. The carriage has an arm section having a movable mechanism to which the magnetic head is fixed and which enables loading and unloading of the magnetic head with respect to the magnetic disk; And a pedestal portion to which the main body is fixed, the main body having a loading control lever for controlling loading and unloading of the body. The stage movable with respect to the magnetic disk is provided with a carriage mounting portion for rotatably and detachably mounting a pedestal portion of the carriage. The guide means guides the movement of the stage, and the stage drive means changes the distance between the magnetic disk and the carriage by moving the stage along the guide. The rotation driving means supplies power for rotating the carriage to the stage.
The loading control power supply means is provided inside the stage, and uses a shaft to supply power required for controlling the loading and unloading of the magnetic head to and from the magnetic disk by the loading control lever.

As described above, according to the present invention, the loading control power supply means is provided not on the main body of the carriage but on the stage, so that the weight of the carriage can be reduced. On the other hand, by using the shaft, it is possible to supply the power required for loading and unloading to the loading control lever.

At this time, the above-mentioned shaft is constituted by a first shaft whose main part is arranged inside the carriage and a second shaft whose main part is arranged inside the stage.
The first shaft and the second shaft are connected or disconnected according to attachment and detachment of the carriage to and from the stage.

More specifically, according to the present invention, a shoulder for supporting the weight of the carriage when the pedestal portion of the carriage is mounted on the carriage mounting portion of the stage is provided on the pedestal portion. A pedestal support is provided for supporting the pedestal portion by contacting the shoulder of the pedestal portion when the portion is mounted. Further, one or both of the stage and the carriage are provided with magnetic property control means for controlling the magnetic properties of one or both of the shoulder and the pedestal support. Then, when the carriage is removed from the stage, a magnetic repulsive force is generated between the shoulder and the pedestal support under the control of the magnetic characteristic control means, and the carriage is lifted, so that the carriage can be removed from the stage. This reduces vibration generated when the carriage is removed.

[0019]

FIG. 1 is a partial perspective view of an example of an embodiment using a magnetic head loading mechanism according to the present invention. Components corresponding to those of the conventional example will be described with the same reference numerals. When comparing FIG. 1 and FIG. 5, a major feature is that the motor 34 is eliminated from the carriage 20. As a result, the weight of the entire carriage 20 is reduced as compared with the related art, whereby the positioning speed and accuracy of the magnetic head 22 with respect to the magnetic disk 12 are improved.

FIG. 2 is a sectional view of an example of an embodiment using a magnetic head loading mechanism according to the present invention. The motor 35 supplies control power required for loading and unloading to the loading control lever 32 using the shaft 50. The loading control lever 32 is
When the shaft 50 moves up and down, the shaft 50 rotates around the axis 33,
This causes the head mounting block 28 to rotate about the axis 30. As a result, the loading or unloading of the magnetic head 22 at the tip of the suspension 24 fixed to the head mounting block 28 with respect to the magnetic disk 12 is performed.

The shaft 50 slides along a shaft guide 52 that encloses the outer periphery. Furthermore, shaft 5
Reference numeral 0 denotes a first shaft 50a whose main part exists on the carriage 20 side and a second shaft 50b whose main part exists on the stage 40 side. The first and second shafts 50a and 50b are connected or disconnected at the connecting portion 54 in accordance with attachment and detachment of the carriage 20 to and from the stage 40. The second shaft 5
Ob has elasticity so that even if the shaft guide 52 is curved, it can be deformed and slid along it.

The pedestal portion 38 of the carriage 20 has a shape in which two cylindrical shapes having different diameters are stacked, and has a T-shape in the sectional view shown in FIG. When the pedestal portion 38 is mounted on the carriage mounting portion 44 of the stage 40,
The weight of the carriage 20 is supported by the stage 40 at the lower end (hereinafter referred to as a shoulder) 56 of the upper cylindrical shape. Correspondingly, the pedestal support 46 supporting the weight of the carriage 20 in contact with the shoulder 56 is provided on the carriage mounting portion 44.
Is provided. A bearing (not shown) is provided on the shoulder 56 or the pedestal support 46 so that the carriage 20 can rotate smoothly. The rotation drive motor 47 rotates the carriage 20 as needed.

FIG. 3 shows a state where the carriage 20 can be removed from the stage 40. The shoulder 56 is provided with a permanent magnet (not shown), while the pedestal support 4
6 is provided with an electromagnet (not shown). When the carriage 20 is removed from the stage 40, the magnetic property control circuit 48 provided inside the stage 40 supplies a current to the electromagnets on the pedestal support portion 46, and makes the magnetic characteristics of the shoulder portion 56 and the pedestal support portion 46 mutually. It has the same polarity, thereby generating a magnetic repulsion between the shoulder 56 and the pedestal support 46. At this time, by gradually increasing the current,
The carriage 20 is slowly levitated from the stage 40. Thus, vibration generated when the carriage 20 is detached from the stage 40 can be reduced. The vibration is most likely to occur when the shoulder 56 is attached to the pedestal support 46.
It is the moment you leave. Therefore, it is important to perform this moment using magnetic repulsion. Once the shoulder 56 is separated from the pedestal support 46, the carriage 20 may be completely removed from the stage 40 manually or using a mechanical mechanism.

Although an example in which a permanent magnet is provided on the shoulder 56 has been described here, an electromagnet is used instead.
A permanent magnet may be used for the pedestal support 46. of course,
Electromagnets may be used for both the shoulder 56 and the pedestal support 46. In any case, it is only necessary to use an electromagnet for either the shoulder 56 or the pedestal support 46 so that magnetic force can be generated as needed.

As described above, according to the magnetic head loading mechanism of the present invention, the motor for supplying the power for controlling the loading and unloading of the magnetic head is changed from the carriage to the stage by utilizing the power transmission by the shaft. This makes it possible to reduce the weight of the carriage. Thereby, the positioning speed and accuracy of the magnetic head with respect to the magnetic disk can be improved. In addition, when the carriage is removed from the stage, the carriage is gently lifted using magnetic repulsion to reduce the occurrence of vibration. As a result, it is possible to reduce the adverse effect on the inspection operation performed by another carriage when replacing the carriage, and to improve the inspection efficiency.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of an example of an embodiment using a magnetic head loading mechanism according to the present invention.

FIG. 2 is a cross-sectional view of an example of an embodiment using a magnetic head loading mechanism according to the present invention.

FIG. 3 is a cross-sectional view showing a state in which a carriage can be removed from a stage in the magnetic head loading mechanism according to the present invention.

FIG. 4 is a diagram showing an example of sector allocation in magnetic disk inspection.

FIG. 5 is a perspective view showing an example of a conventional swing arm type magnetic head loading mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spindle motor 12 Magnetic disk 14 Disk clamp 20 Carriage 22 Magnetic head 24 Suspension 26 Arm part 26 Suspension 28 Head mounting block 28 Pedestal part 30 Axis 32 Loading control lever 33 Axis 34 Motor 35 Motor 35 Main body 38 Pedestal part 40 Stage 42 Stage guide 44 Carriage mounting part 46 Pedestal support part 48 Magnetic characteristic control circuit 50 Shaft 50a First shaft 50b Second shaft 52 Shaft guide 54 Connecting part 56 Shoulder

Claims (3)

[Claims] A magnetic head loading mechanism in a magnetic disk inspection apparatus for inspecting a magnetic disk or a magnetic head, wherein a movable mechanism that fixes a magnetic head and enables loading and unloading of the magnetic head with respect to the magnetic disk. A main body having a loading control lever for controlling the loading and unloading of the magnetic head onto and from the magnetic disk by driving the movable mechanism while the arm is fixed, and the main body is fixed. A carriage having a pedestal portion; a stage having a carriage mounting portion for rotatably and detachably mounting the pedestal portion, the stage being movable with respect to the magnetic disk; and guide means for guiding the movement of the stage; Move the stage along the guide A stage driving unit for changing a distance between the magnetic disk and the carriage by moving; a rotation driving unit for supplying power for rotating the carriage to the stage; A magnetic head loading mechanism comprising: loading control power supply means for supplying power required for controlling loading and unloading of the magnetic head to and from the magnetic disk by the loading control lever using a shaft. The shaft comprises a first shaft whose main part is arranged inside the carriage, and a second shaft whose main part is arranged inside the stage. The shaft is adapted to be attached to and detached from the stage. The first
2. The magnetic head loading mechanism according to claim 1, wherein the shaft and the second shaft are connected or disconnected. 3. The pedestal portion of the carriage has a shoulder for supporting the weight of the carriage when mounted on the carriage mounting portion, and the carriage mounting portion of the stage has the pedestal portion mounted thereon. Sometimes having a pedestal support that supports the pedestal in contact with the shoulder of the pedestal, wherein one or both of the stage and the carriage are magnetically coupled to one or both of the shoulder and the pedestal support. Magnetic characteristic control means for controlling dynamic characteristics, when the carriage is detached from the stage, a magnetic repulsive force is generated between the shoulder and the pedestal support under the control of the magnetic characteristic control means to cause the carriage 3. The apparatus according to claim 1, wherein the carriage is detachable from the stage by lifting the carriage.
The magnetic head loading mechanism as described in the above.