JPH0896538A - Magnetic head loading device - Google Patents

Abstract

PURPOSE: To obtain a magnetic head loading device suitable for use of a high- density magnetic disk without damaging the magnetic disk at the time of loading of a magnetic head. CONSTITUTION: An arm part 44 mounting a magnetic head 52 at the front end is turnably mounted at a base part 42. A slider 58 having a cam follower 60 at one end is arranged in this base part. The arm part and a slider are connected by a driving spring. A magnetic head cartridge including the base part, the arm part, the slider and the driving spring is mounted at a carriage mechanism 34 via a clamping mechanism 32. The carriage mechanism has a cam to drive the slider and the slider slides within the arm by driving control of the cam. The driving spring presses the arm part to turn the arm part to put the magnetic head into a loading state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head loading device, and more particularly to a magnetic head loading device used in a magnetic disk inspection device.

[0002]

2. Description of the Related Art In testing a magnetic disk, as is well known, a magnetic head is brought into contact with, or loaded into, the magnetic disk for writing and reading test data. FIG. 6 shows a first example of a conventional magnetic head loading device. The magnetic head 10 is formed by attaching a slider 14 which is an electric element for writing and reading data to one end of a gimbal bar 12 which is an elastic plate piece. The magnetic head 10 is clamped by the clamp mechanism 18, and the carriage mechanism 20 operates the clamp mechanism 18 in the vertical direction and moves it in the horizontal direction. In this apparatus, the carriage mechanism 20 moves the magnetic head 10 above the magnetic disk 16 and then lowers it directly below to perform loading. Since the gimbal bar 12 is inclined with respect to the magnetic disk 16, the tip corner portion of the slider 14 is initially placed on the magnetic disk 16 when loading.
Hit The entire lower surface of the slider 14 is the magnetic disk 16
When the magnetic head 10 descends until it comes into contact with, the bending portion of the mounting portion of the gimbal bar 12 extends during that time, so that the slider 14 advances on the magnetic disk 16 toward its center. At this time, the slider 14 moves the magnetic disk 1
The surface of 6 may be damaged.

FIG. 7 shows a second example of a conventional magnetic head loading device. In this example, the magnetic head 10 is operated only in the horizontal direction by the carriage mechanism 20. The lever mechanism 22 operates in the vertical direction with respect to the clamp structure 18 on which the magnetic head 10 is clamped. During loading, the lever 24 of the lever mechanism 22 lifts the magnetic head 10 and prevents the slider 14 from colliding with the magnetic disk 16 while the magnetic head 10 moves in the horizontal direction. When the magnetic head 10 stops at a predetermined position, the lever mechanism 22 causes the magnetic head 10 to move to the magnetic disk 1.
6, the lever 24 stands by between the gimbal bar 12 and the magnetic disk 16 during the read / write operation of the magnetic head 10.

[0004]

As the recording density of the magnetic disk becomes higher, the flying height of the magnetic head 10 becomes lower,
The distance between the magnetic disk 16 and the clamp portion of the magnetic head 10, the so-called z height, is a short distance of about 0.4 mm. In the loading apparatus shown in FIG. 7, the lever 22 stands by between the gimbal lever 12 and the magnetic disk 16, and the lever 24 has a certain thickness. Therefore, for testing such a high density magnetic disk with a small z-height. Not suitable. Further, since the gimbal bar 12 is lifted each time it is loaded, the portion of the gimbal bar 12 clamped to the clamp structure 18 becomes fatigued and the life of the magnetic head 10 is shortened.

Therefore, an object of the present invention is to provide a magnetic head loading device which is suitable for use on a high density magnetic disk without damaging the magnetic disk when loading the magnetic head.

[0006]

A magnetic disk according to the present invention
In the loading device, an arm portion having a magnetic head attached to its tip is rotatably attached to a base portion.
A slider having a cam follower at one end is arranged in the base portion, and the arm portion and the slider are connected by a drive spring. The slider and the drive spring are rotation transmitting means for rotating the arm portion. These base part, arm part,
The magnetic head cartridge including the slider and the drive spring is attached to the carriage mechanism via the clamp mechanism. The carriage mechanism has a cam that drives the slider, and the slider slides in the arm by the drive control of the cam.
The drive spring presses the arm portion to rotate it, and the magnetic head enters the loading state.

[0007]

Since the loading and unloading operations of the magnetic head are performed by the rotation of the arm portion in accordance with the rotation control of the cam, it is not necessary to use a lever for lifting the gimbal bar at the time of unloading, which is required in the conventional method. -The height can be reduced, the magnetic disk for high-density recording can be tested, and the magnetic head is not fatigued by loading and unloading operations.

[0008]

1 and 2 are a plan view and a side view showing a magnetic head loading device of the present invention. This device uses an in-line method for loading the magnetic head. In these figures, a magnetic head cartridge 30 to which a magnetic head is attached is detachably fixed to a cartridge clamp mechanism 32 attached to a carriage mechanism 34 by a screw or the like. The magnetic disk 36 is detachably fixed to a disk clamp mechanism 38 having a rotation motor built therein, and is rotated at a constant speed during the test of the magnetic disk. The carriage 34 and the disc clamp mechanism 38 are arranged on a base 40. During the test of the magnetic disk 36, the carriage mechanism 34
Is moved by a drive means (not shown) in a direction perpendicular to the plane of the drawing, and the magnetic head cartridge 30 is also moved.

FIG. 3 shows the magnetic head cartridge 30 removed from the clamp mechanism 32. The magnetic head cartridge 30 includes a base portion 42 and the base portion 42.
It has an arm portion 44 rotatably attached to. The base portion 42 is coupled to the first rectangular portion and the first rectangular portion,
It is composed of a second rectangular portion having an area smaller than this (in FIG. 1, the hidden portion of the outline of the first rectangular portion is indicated by a dotted line).
The arm portion 44 is formed by providing a pair of protrusions on the rectangular portion and forming a concave portion corresponding in shape to the second rectangular portion of the base portion 42. A through hole is provided in the second rectangular portion of the base portion 42, and a through hole is provided in the pair of protrusions of the arm portion 44. By inserting the shaft pin 46 (shown by the one-dot chain line in FIG. 1) into the through hole in a state where these through holes are aligned, the arm portion 44 becomes rotatable with respect to the base portion 42. The shaft pin 46 is a cylinder having a built-in bearing, and female ends are cut at both ends thereof. Male screw 4 on both ends of shaft pin 46
By screwing in 8, the shaft pin 46 is arranged without slipping out from the base portion 42 and the arm portion 44.

A rectangular notch is formed below the tip of the arm portion 44, and a head mounting block 50 is attached to this notch. The magnetic head 52 is a gimbal
It consists of a bar 54 and a slider 56 attached to one end of the gimbal bar. The slider 56 is the magnetic disk 3
6 is an electric element for writing or reading data to or from the device 6. The magnetic head 52 is attached to the arm portion 44 by attaching the other end of the gimbal bar 54 to the head attachment block 50 with a screw or the like. Gimbal Bar 5
4 is slightly bent at its mounting portion.
The head mounting block 50 is replaced depending on the type of the magnetic head 52. Usually, a plurality of magnetic heads are used to shorten the test time of the magnetic disk, and two magnetic heads 52 are attached in FIG.

A receiving plate 54 contacts the lower surface of the base portion 42. The receiving plate 54 has a slightly larger area than the first rectangular portion of the base portion 42, and projects from the first rectangular portion on the second rectangular portion side. The base portion 42 and the receiving plate 54 are cut out so that the lower side of one side of the first rectangular portion is equal to the width of the second rectangular portion as shown in FIG. 4 when viewed from the right side in FIG. , In FIG. 4, in the direction perpendicular to the paper surface,
In FIG. 3, it has a dent portion extending laterally on the paper surface, and a cavity 56 is formed between it and the receiving plate 54.

A slider 58 made of a material having a small friction coefficient such as Teflon is inserted in the cavity 56. Figure 4
As shown in, the cross-sectional area of the slider 58 is equal to the cross-sectional area of the cavity 56, most of which extends into the cavity portion 56 and one end of which is exposed from the cavity 56. A bearing acting as a cam follower 60 is attached to one end of the exposed slider 58, as described later.

The arm portion 44 and the slider 58 are made of steel wire.
They are connected by a drive spring 62 which is formed by winding and is shown by a solid line and a dotted line in FIG. The spring 62 has one end inserted into a small hole provided in the vicinity of the upper end of the surface of the arm portion 44 on the side opposite to the side where the magnetic head is attached, and the middle portion of the spring 62.
The other end is bent through the groove provided in the first rectangular portion 2 and the groove provided in the slider 58, and is inserted into the hole provided in the slider 58. The groove provided in the slider 58 is inclined with respect to the longitudinal direction of the slider 58, and the spring 62 is arranged so as to be inclined. As a result, in the non-loading state in which the cam follower 60 is not pressed, the spring 62 supports the arm portion 44 in the inclined state in which the tip end is raised. In FIG. 3, the arm unit 4
4 is in contact with the receiving plate 54 at the lower right end, and the base portion 4 is at the upper right end.
The arm portion 42 is restricted to a constant tilted state by abutting on 2. Therefore, in the non-loading state, the magnetic head 52 is maintained at a predetermined raised position as shown in FIG.
A stop plate 64 is attached to the upper surface of the base portion 42 and a part of the upper surface of the protrusion of the arm portion 44. This stop plate 64
Restricts the inclination of the arm portion 44 in the rotating state and restricts the magnetic head to a constant lowered position.

The clamp shaft 66 is composed of a central shaft, a coil spring and a knob, and penetrates the base portion 42 and the receiving plate 54. Connect the central shaft of the clamp shaft 66 to the clamp mechanism 3
The magnetic head cartridge 30 is inserted into the opening corresponding to 2 and the magnetic head cartridge 30 is clamped by the clamp mechanism 3.
Fixed to 2. This clamp operation is not the subject matter of the present invention, so a detailed description thereof will be omitted.

As shown in FIGS. 1 and 2, when the magnetic head cartridge 30 is fixed to the clamp mechanism 32, the cam follower 60 attached to the slider 58 faces the cylindrical cam 68. The cam 68 has an eccentric rotating shaft,
The rotation is controlled by an appropriate driving means, the cam follower 60 is not pressed during non-loading, and the cam follower 60 is pressed during loading. FIG. 5 shows a loading state of the magnetic head 36 by the cam 68 pressing the cam follower 60. At this time, the slider 58 slides to the left, the drive spring 62 presses the upper end of the right side surface of the arm portion 44, and rotates the arm portion 44 counterclockwise.
The right upper surface of the arm portion 44 contacts the stop plate 64, and the arm portion 42 and the magnetic head 52 are located at a position where the lower surface of the slider 56 of the magnetic head 52 appropriately contacts the magnetic disk 36.
Stops. Even if the slider 60 is further pressed by the cam 68 after the right upper surface of the arm portion 44 hits the stop plate 64,
The spring 62 absorbs the force. When the magnetic head 52 is released from the loading state, the cam 68 is rotationally controlled again to return the slider 58 to the original position, whereby the arm portion 44 is rotated clockwise, and the magnetic head 52 is not loaded. It becomes a state. As described above, since the loading and unloading operations of the magnetic head 52 are performed by the rotation of the arm portion 44 in accordance with the rotation control of the cam 68, the gimbal bar is lifted at the time of unloading as in the conventional example shown in FIG. Since there is no need to use a lever, the z-height can be lowered and it can be used for testing high density recording magnetic disks.

As shown in FIG. 6, when the magnetic head 52 coupled to the arm portion 44 rotates during the loading operation, the tip corners of the slider 56 first come into contact with the magnetic disk 36, and as the rotation progresses, the slider moves. The entire lower surface of 56 comes into contact with the magnetic disk 36. At this time, the slider 56 is pulled in the direction of the arm portion 44 by the rotation about the shaft pin 46, but at the same time, the bent portion of the gimbal bar 54 is extended, and the slider 56 is moved in the direction opposite to the arm portion 44. Is pushed out, the slider 56 only moves a small distance in the direction of the arm portion 44. Therefore, since only the corners of the slider 56 hardly move by hitting the magnetic disk 36, it is possible to avoid damaging the magnetic disk 36 with the slider 56 during loading.

Although one embodiment of the present invention has been described above, various modifications and changes can be made without departing from the gist of the present invention. For example, although an in-line loading device is illustrated in FIG. 1, it will be apparent to those skilled in the art that the present invention can be applied to a transversal loading device.

[0018]

[Explanation of symbols]

According to the magnetic head loading apparatus of the present invention, the loading and non-loading operations of the magnetic head are performed by the rotation of the arm portion in accordance with the rotation control of the cam. No need to use a lever to lift the gimbal bar,
The z-height can be lowered, the magnetic disk for high-density recording can be tested, and the magnetic head is not fatigued by loading and unloading operations.

[Brief description of drawings]

FIG. 1 is a plan view showing a magnetic head loading device of the present invention.

FIG. 2 is a side view showing a magnetic head loading device of the present invention.

FIG. 3 is a side view showing a magnetic head cartridge of the apparatus shown in FIG.

FIG. 4 is a rear view showing a part of the magnetic head cartridge.

FIG. 5 is a diagram showing a loading state of a magnetic head.

FIG. 6 is an enlarged view for explaining the movement of the tip of the magnetic head.

FIG. 7 is a simplified diagram showing a conventional magnetic head loading device.

FIG. 8 is a simplified diagram showing a conventional magnetic head loading device.

[Explanation of symbols]

 30 magnetic head cartridge 32 clamp mechanism 34 carriage mechanism 42 base portion 44 arm portion 52 magnetic heads 58 and 62 rotation transmission means 68 drive means

Claims (1)

[Claims] 1. A base portion, an arm portion rotatably attached to the base portion, a magnetic head attached to a tip of the arm portion, and a magnetic head movably arranged on the base portion to rotate the arm portion. A magnetic head cartridge having a rotation transmitting means driven to move, and a cartridge for fixing the magnetic head cartridge.
A clamp mechanism; and a carriage mechanism having the drive mechanism for moving the magnetic magnetic head with respect to the magnetic disk mounted on the disk clamp mechanism and driving the rotation transmission means. A magnetic head loading device characterized in that