JPH06101212B2 - Transducer positioning device for magnetic disk - Google Patents

Description

The present invention relates to a magnetic disk transducer positioning device, and more particularly to a magnetic disk transducer positioning device that employs a swing arm system.

[Conventional technology]

A transducer positioning mechanism used in a magnetic disk device is a magnetic disk (hereinafter simply referred to as "disk").
Concentric tracks (hereinafter referred to simply as "tracks")
It is indispensable for magnetically recording and reproducing predetermined information.

In this case, the transducer needs to be accurately positioned on a selected track on the disk surface. Predetermined information is written and read by this accurately positioned transducer.

For the positioning of the transducer, conventionally, a mechanism in which a leaf spring-shaped suspension mechanism, a slider, a head support arm and the like are combined is used.

In the swing arm system in which the head support arm or the like is rotated about the pivot part, it is generally necessary that the accuracy of the main shaft of the slider equipped with the magnetic head and the main shaft of the suspension mechanism be at a right angle. ing.

[Problems to be Solved by the Invention]

In the above conventional example, the main shaft portion of the suspension mechanism is extended from the main shaft portion of the head support arm in the same direction (almost one side of the thick head support arm when viewed from the side). Equipped in parallel). For this reason, the turning radius becomes large as a whole, so that a large moment of inertia is generated in the surrounding of the pivot part, which hinders the rapid movement and stop of the transducer and makes it possible to accurately stop at the stop position. There is an inconvenience that it takes more time than necessary.

On the other hand, there are other conventional examples, for example, those in which the spindle along the moving surface of the slider and the spindle of the suspension mechanism are arranged so that their angles are substantially parallel to each other. Similar to the above-mentioned case, the angles of and were arranged so as to be substantially parallel when viewed from the lateral direction. And
In the case of the other conventional example, when the size is reduced, interference (mechanical collision) between the holder and the magnetic disk is apt to occur, and in order to avoid this, normally, from the transducer to the rear end of the arm (anti-transducer of the arm). End face)
Large mechanical dimensions are set up. For this reason,
As a result, it has a large moment of inertia around the pivot as in the case described above. As in the case of the above-mentioned conventional example, this has a disadvantage that the rapid positioning of the transducer is significantly hindered.

[Object of the Invention]

The present invention improves the inconveniences of the conventional example, in particular, downsizing the entire apparatus and reducing the moment of inertia of the entire magnetic head portion, and at the same time, for positioning the transducer with respect to the magnetic disk relatively quickly. It is an object of the invention to provide a positioning device for a transducer.

[Means for Solving the Problems]

The present invention is provided with a magnetic head assembly having a slider that supports a transducer arranged corresponding to a magnetic disk at its tip, and a suspension mechanism composed of a leaf spring member that supports the slider. Also, a holder that supports this magnetic head assembly at one end via a support arm,
The slider is provided with a pivot portion that supports the other end portion of the holder, and a drive arm that extends to the opposite side of the holder through the pivot portion and that is integrally connected to the holder. It is configured to be reciprocally movable in the radial direction of the magnetic disk with the pivot portion as the center of rotation.

Further, the center line of the member connecting the holder, the pivot portion and the drive arm is arranged so as to be separated from the outer peripheral edge of the magnetic disk and substantially parallel to the outer peripheral tangent line of the magnetic disk on the drive arm side.

Then, the slider is fixed in a state rotated by a predetermined angle from the central axis of the suspension mechanism and mounted on the suspension mechanism so that the extension line of the central axis of the slider passes through the rotation center point of the pivot portion. . This aims to achieve the above-mentioned object.

[Action]

First, when writing / reading data, the magnetic head assembly rotates around the pivot portion, and the slider at the tip portion is moved along the radial direction of the magnetic disk.
Then, the data writing or reading operation is performed at a predetermined position.

In this case, the central line of the member connecting the holder, the pivot portion and the drive arm is arranged so as to be separated from the outer peripheral edge of the magnetic disk and substantially parallel to the outer peripheral tangent line of the lower end portion of the magnetic disk in FIG. In addition, since the magnetic head is projected from the one end of the holder toward the magnetic disk in a bent state, the radius of gyration of the slider is smaller than that of the conventional holder 1.
Since it is smaller than the state in which it is extended and installed, not only the size of the entire apparatus can be reduced, but also the moment of inertia of the magnetic head assembly portion can be made smaller than the conventional one. Therefore, the slider transfer control and the stop control at the write / read position can be performed more quickly.

Further, as described above, since the holder is arranged substantially parallel to the tangent line of the lower end edge of the magnetic disk in FIG. 1, the magnetic head portion is rotated about the pivot portion and the innermost circumference on the magnetic disk is rotated. Even when the holder is moved to the track position (the position indicated by the chain double-dashed line in FIG. 1), the holder is always located outside the magnetic disk. Therefore, the holder that supports the magnetic head at the center of rotation is It will not come into contact with the magnetic disk.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 2 indicates a magnetic head assembly,
12 indicates a magnetic disk. The magnetic head assembly 2 is configured to include a slider 9B that supports a transducer 9A arranged corresponding to the magnetic disk 1 at its tip and a suspension mechanism 8 that is a leaf spring member that supports the slider 9B. There is. The magnetic head assembly 2 is supported by one end of the holder 1 via a support arm 2A. Here, the core 9 is composed of the transducer 9A and the slider 9B supporting the transducer 9A.

The other end of the holder 1 is integrally supported by the pivot part 10 and is equipped so as to be capable of reciprocating rotation when the pivot part 10 reciprocates. Further, the drive arm 4 is extended to the opposite side of the holder 1 via the pivot portion 10 and is integrally connected to the holder 1. The drive arm 4 includes a thin steel strip 5 and a spring member 6 for fastening the steel strip.
Is connected to the actuate motor 7 via.

Further, while the slider 9B is held by the suspension mechanism 8, the support arm 2A and the holder 1, when the pivot part 10 is reciprocally rotated, the radius of the magnetic disk is centered around the center part of the pivot part 10. It is equipped so that it can be reciprocated in any direction.

Further, the center line of the member connecting the holder 1, the pivot portion 10 and the drive arm 4 is separated from the outer peripheral edge of the magnetic disk 12 and is substantially parallel to the outer peripheral tangent line of the lower end portion of the magnetic disk 12 in FIG. It is arranged. The slider 9B moves the central axis of the slider 9B so that the extension of the central axis of the slider 9B along the surface of the magnetic disk 12 passes through the rotation center point of the pivot portion 10. Is mounted on the suspension mechanism 8 in a state of being rotated by a predetermined angle from the central axis line along the longitudinal direction of the.

Here, the suspension mechanism 8 is composed of an elongated plate-shaped load spring plate 8A and a strip-shaped suspension member 8B attached to the tip of the load spring plate 8A. This suspension member 8B is a load spring plate.
Equipped along 8A.

The magnetic head assembly 2 is irremovably mounted in a sealed container 13 together with the magnetic disk 12 shown in FIG. In this embodiment, the magnetic head assembly 2 is of a winch-ester type and is used for writing or reading on the lower surface of the magnetic disk 12 or on any surface of the stacked magnetic disks 12, and therefore the slider 9B is used.
The part is adapted to float on the magnetic disk 12. The magnetic head assembly 2 may be configured such that a laminated structure is attached to the holder 1.

A hard disk having wear resistance is used as the magnetic disk 12. The magnetic disk 12 is attached to a spindle motor 14 and is driven at a constant rotation speed during operation.

On the other hand, although the step motor is used as the actuate motor 7, a torque motor having an optical or magnetic encoder may be used.

As shown in FIG. 2, thin steel strips 5A and 5B are wound around the output shaft 7A of the actuate motor 7. One end of each of the thin steel strips 5A and 5B is wound around and fixed to the output shaft of the actuate motor 7, and the other end thereof is pulled out and fixed to both ends of the V-shaped spring 6. Here, the actuate motor 7 is arranged on the opening side of the V-shaped leaf spring 6.

Thus, the output shaft 7A of the actuate motor 7 is connected to the V-shaped leaf spring 6 via the thin steel strips 5A and 5B.

The V-shaped leaf spring 6 has one side connected to the drive arm 4. Therefore, the thin steel strips 5A and 5B can be wound or unwound on the actuate output shaft 7A to transmit the rotational movement of the actuate motor 7 described above to the drive arm 4.

Then, in the above embodiment, the inclination angle between the extension line of the central axis connecting the above-mentioned pivot portion 10 of the slider 9B and the tangent line of the innermost track or outermost track having the largest inclination (commonly known as The core 9 is arranged and fixed so that the yaw angle α is within 15 °.

Further, the angle β (see FIG. 3) between the central axis of the slider 9B and the longitudinal central axis of the suspension mechanism 15 is 15 ° or more and 75 ° or less (about 18.5 ° in FIG. 1). Is installed as.

Next, the operation of the above embodiment will be described.

First, when writing / reading data, the actuate motor 7 is actuated by external control to rotate the magnetic head assembly 2 about the pivot portion 10, and the slider 9B at the tip end moves in the radial direction of the magnetic disk 12. Will be transported along. Then, the data writing or reading operation is performed at a predetermined position.

In this case, the central line of the member connecting the holder 1, the pivot part 10 and the drive arm 4 is separated from the outer peripheral edge of the magnetic disk 12 and is substantially parallel to the outer peripheral tangent line of the lower end of the magnetic disk 12 in FIG. , And the magnetic head assembly 2 is projected from the one end of the holder 1 toward the magnetic disk 12 so that the radius of gyration of the slider 9B is extended to that of the conventional holder 1. The size of the magnetic head assembly 2 can be made smaller than that of the conventional one, and the moment of inertia of the magnetic head assembly 2 can be made smaller than the conventional one.
Therefore, it is possible to more quickly perform the transfer control of the slider 9B and the stop control at the write / read position.

Further, as described above, since the holder 1 is arranged substantially parallel to the tangent line of the lower edge of the magnetic disk 12 in FIG. 1,
Even when the magnetic head assembly 2 part is rotated around the pivot 10 part and is transferred to the innermost track position on the magnetic disk 12 (the position indicated by the chain double-dashed line in FIG. 1), the holder 1 remains Since it is always located outside the magnetic disk 12, the holder 1 that supports the magnetic head assembly 2 at the center of rotation does not come into contact with the magnetic disk 12.

For this reason, it becomes possible to form the rotation center side relatively robustly, the moment of inertia can be reduced at this point as well, and at the same time, the separation distance between the recording surface of the magnetic disk 12 and the slider 9B is 0.2 to 0.3. There is an advantage that [μm] can be maintained with high accuracy for a long time. That is, this embodiment has the advantages that the overall size of the device can be reduced and the operation of the magnetic head assembly 2 can be made smooth at the same time, and the durability of the entire device can be improved.

Further, in the present embodiment, when the magnetic head assembly 2 is moved from the position of the solid line to the position of the chain line as shown in FIG. The innermost part and the outermost part are arranged in the opposite directions at substantially the same inclination (angle α) with respect to the close battle, and are equipped so as to be almost overlapped with the close fight of the central truck. There is. Therefore, in the present embodiment, the maximum value of the inclination of the slider 9B with respect to the close battle of the track is set to be relatively small, which allows the position control during reading and writing to be executed with relatively high accuracy. There is.

In the above embodiment, the steel strips 5A and 5B wound around the output shaft 7A of the actuate motor 7 are separate steel strips, but the diameter of the wound portion of the output shaft 7A is formed to be large. In addition, it may be configured to use thin steel strips connected to each other.

〔The invention's effect〕

Since the present invention is constructed and functions as described above, according to this, the central line of the member connecting the holder, the pivot portion and the drive arm is separated from the outer peripheral edge of the magnetic disk and the outer peripheral tangent line of the magnetic disk. Since the magnetic head assembly is provided so as to project toward the magnetic disk in a state of being bent from one end of the holder, the substantial turning radius of the slider can be reduced. Therefore, the moment of inertia of the magnetic head portion can be made smaller than that of the conventional one. At the same time, since the relationship between the holder and the magnetic head assembly is configured as described above, the turning radius of the slider is reduced. Nevertheless, it is possible to effectively avoid the holder portion from hitting the magnetic disk during the reciprocating movement of the slider. Therefore, at the center of rotation of the magnetic head assembly, The holder portion can be made robust and the magnetic head assembly portion on the rotating end side can be made light in weight. Therefore, also in this respect, the moment of inertia of the magnetic head assembly portion can be reduced, and at the same time, To provide an unprecedented excellent magnetic disk transducer positioning device that can quickly and accurately move a slider to a predetermined position on a magnetic disk and can continue and maintain this for a long time. You can

[Brief description of drawings]

FIG. 1 is a partially omitted plan view showing an embodiment of the present invention,
2 is an explanatory view showing the relationship between the actuate motor and the V-shaped spring in FIG. 1, and FIG. 3 is a plan view showing the magnetic head assembly portion in FIG. 1 ... Holder, 2 ... Magnetic head assembly, 4 ... Drive arm, 8 ... Suspension mechanism, 9A ... Transducer, 9B ...
… Slider, 10 …… Pivot part, 12 …… Magnetic disk.

Claims (1)

[Claims] 1. A magnetic head assembly comprising a slider for supporting a transducer arranged corresponding to a magnetic disk at a tip portion thereof, and a suspension mechanism composed of a leaf spring member for supporting the slider, and a magnetic head assembly. A holder that supports the solid body at one end through a support arm, a pivot portion that supports the other end of the holder, and a holder that extends to the opposite side of the holder through the pivot portion and is integral with the holder. A transducer positioning device for a magnetic disk, comprising: a drive arm connected to the slider, wherein the slider is configured to be reciprocally movable in a radial direction of the magnetic disk with the pivot portion as a rotation center, wherein the holder, the pivot portion, and the drive arm are provided. The center line of the member that connects the magnetic disk is separated from the outer peripheral edge of the magnetic disk, The slider is arranged substantially parallel to the circumferential tangent line, and the slider is moved from the central axis in the longitudinal direction of the suspension mechanism so that the extension line of the central axis in the moving surface of the slider passes through the rotation center point of the pivot portion. A transducer positioning device for a magnetic disk, which is mounted on the suspension mechanism while being rotated by an angle.