JPH04355292A - Floating type magnetic head device - Google Patents

Abstract

PURPOSE:To regulate the floating quantity of a slider to the quantity approximately constant over the entire area of the recording region of a hard disk and to shorten the access time as well as to lower the electric power of a drive. CONSTITUTION:This magnetic head device consists of the slider 1 which floats a magnetic head apart a slight spacing from the hard disk and a head supporting member 2 which suppors the above-mentioned slider 1. The slider 1 is mounted to the head supporting member 2 by inclining the slider 1 at such an angle as to decrease a skew angle to zero on the innermost periphery of the recording region of the hard disk.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying magnetic head device for recording and reproducing information on a so-called hard disk, and more particularly to the attachment of a slider to a head support member.

0002

2. Description of the Related Art As a floating magnetic head device for recording and reproducing information on a hard disk, for example, as shown in FIG. A structure in which the head support member 52 is attached to the head support member 52 via a leaf spring has been proposed. Normally, in this type of magnetic head device, the slider 51 has air inflow grooves 51a provided in the slider 51 with respect to the head support member 52.
The hard disk drives 53 are aligned in the longitudinal direction, and are provided facing the hard disk 53 as shown in FIG.

By the way, in a drive device incorporating the above-mentioned floating magnetic head device, due to miniaturization, a rotary actuator is used to support the base end 52a of the head support member 52 and to move the slider 51 up and down and rotate it. The length of the arm (not shown) is made as short as possible to shorten the access time. That is, the center of rotation of the actuator (indicated by the middle point O in FIG. 10) is moved as far as possible in the direction of the arrow Y in the figure to shorten the arm length. However, within the drive, the distance between the hard disk 53 and the rotation center O of the actuator is restricted by the size of the spindle motor that rotates the actuator, and has a lower limit. Therefore, when trying to shorten the arm length of the actuator, the air inflow groove 51a provided in the slider 51 is formed in the direction (line A).
Indicated by ) and the circumferential velocity vector (indicated by line B) at the innermost circumference of the recording area 53a of the hard disk 53 (hereinafter referred to as skew angle θ), it becomes necessary to change the angle θ (hereinafter referred to as skew angle θ) from negative to positive. .

However, as shown in FIG. 10, when the skew angle θ of the slider 51 is varied from negative to positive from the inner circumference to the outer circumference of the hard disk 53, the peripheral speed gradually increases from the innermost circumference to the outermost circumference of the recording area 53a. The speed becomes faster, and the skew angle θ changes from negative to zero and then to positive accordingly.
As shown in FIG. 11, the flying height of the slider 51 changes more greatly from the innermost circumference to the outermost circumference. At the innermost circumference of the recording area 53a, the skew angle θ is negative and the circumferential speed is not so high, so the flying height is not very large. However, at a position in the middle of the recording area 53a where the skew angle θ becomes zero, the circumferential velocity increases. The flying height increases significantly as . Then, as the slider 51 moves further to the outermost circumference of the recording area 53a, the circumferential speed gradually increases, but the skew angle θ increases accordingly, so the flying height gradually decreases. Note that the broken line in FIG. 11 indicates a change in the flying height of the slider 51 when the skew angle θ is fixed to zero.

As described above, when the flying height of the slider 51 changes greatly from the inner circumference to the outer circumference of the hard disk 53, the output varies when writing or reading information signals, which is disadvantageous in achieving high-density recording. Furthermore, today, in order to increase the recording density, so-called zone bit recording is performed in which recording is performed at a higher frequency from the inner circumference to the outer circumference of the disk. In particular, in zone bit recording, since the recording area 53a is divided into several zones and recording is performed at the same recording density, it is desirable that the flying height of the slider 51 be constant over the entire recording area 53a. However, as described above, since the flying height of the slider 53 changes more widely from the inner circumference to the outer circumference of the hard disk 53, zone bit recording cannot be made effective.

[0006]

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above-mentioned conventional situation. It is an object of the present invention to provide a flying magnetic head device that can be expected to shorten the time and reduce the power consumption of the drive device.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a floating magnetic head device of the present invention includes a slider that levitates a magnetic head with a small gap with respect to a hard disk, and a slider that supports the slider. The slider is installed at an angle to the head support member so that the skew angle becomes zero at the innermost periphery of the recording area of the hard disk.

[0008]

[Operation] When the slider is installed so that the skew angle is negative at the innermost circumference of the recording area of the hard disk, the skew angle changes from negative to zero and from zero to positive from the innermost circumference to the outer circumference of the hard disk. Since the flying height of the slider changes over time, the flying height of the slider changes greatly. However, in the floating magnetic head device according to the present invention, since the slider is mounted at an angle to the head support member so that the skew angle is zero at the innermost circumference of the recording area of the hard disk, the skew angle of the slider is zero. There is only a change from positive to negative. In this case, the circumferential speed of the hard disk gradually increases from the inner circumference to the outer circumference, but the skew angle increases accordingly, so the flying height increases due to the increase in circumferential speed and the flying height due to the increase in the skew angle. By offsetting the decrease in , the flying height becomes substantially constant from the inner circumference to the outer circumference of the hard disk.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to a so-called composite type flying magnetic head device in which a bulk type magnetic head is embedded in a slider. As shown in FIGS. 1 and 2, the floating magnetic head device according to the embodiment includes a slider 1 provided with a magnetic head that flies with a small gap with respect to a hard disk, and a head that supports this slider 1. It is composed of a support member 2.

The slider 1 is made of a non-magnetic material such as ceramics, and is formed as a rectangular parallelepiped with a substantially rectangular plane. An air inlet groove 4 having a substantially rectangular cross section is provided on the air bearing surface 3 of the slider 1 facing the hard disk to stabilize the flying state of the slider 1. The air inflow groove 4 is arranged in the longitudinal direction of the slider 1,
In other words, this air bearing surface 3 extends from the air inflow end 1a to the air outflow end 1b, which is the introduction direction of the air flow shown by arrow X in FIG.
A groove with a rectangular cross section is formed approximately in the center of the groove. The air inlet groove 4 serves to prevent the slider 1 from swinging in the left-right direction and stabilize the floating state by introducing air into the groove.

In addition, the slider 1 has a structure in which the slider 1 can be floated stably by smoothly circulating air to the air bearing surface 3 facing the hard disk and increasing the rigidity of the air layer generated between the air bearing surface 3 and the hard disk. Slanted surfaces 5a and 5b are provided for checking the condition. The inclined surfaces 5a and 5b are provided on the air bearing surface 3 on the side of the air inflow end 1a, and are inclined so that the air flowing in can easily go around the air bearing surface 3.

The slider 1 has a magnetic head 6.
is embedded. The magnetic head 6 is a bulk type magnetic head in which a pair of magnetic cores 7 and 8 made of ferrite or the like constituting a closed magnetic path are glass-fused and a magnetic gap g is formed at the abutting surfaces of the cores 7 and 8 . The magnetic head 6 is attached to the slider 1 by being fitted into a head fitting groove 9 cut out on one side edge of the air outflow end 1b toward the air inflow end 1a and glass-fused. Integrated joint. Note that the magnetic gap g of the magnetic head 6
is designed to appear on the air bearing surface 3.

The slider 1 with the magnetic head 6 integrated therein is attached to the tip of the head support member 2 via a flexible leaf spring (not shown), as shown in FIG. It is being The slider 1 is mounted tilted toward the outer circumference with respect to the head support member 2 so that the skew angle θ becomes zero at the innermost circumferential position of the recording area 10a of the hard disk 10 shown in FIG. That is, in the slider 1, the direction in which the air inflow grooves 4 are formed at the innermost circumferential position of the recording area 10a of the hard disk 10 is the circumferential velocity vector at the innermost circumferential position of the recording area 10a (indicated by line X in FIG. 10). The head support member 2 is attached to the head support member 2 so as to be inclined toward the outer circumferential side of the hard disk 10 so as to coincide with the head support member 2 .

The slider 1 attached to the head support member 2 as described above is provided opposite to the hard disk 10, and is arranged so that the skew angle θ becomes zero at the innermost circumferential position of the recording area 10a. The hard disk 10 is transferred in the radial direction using the rotation center O of the actuator as a fulcrum. Move the slider 1 above to hard disk 10
When the hard disk 10 is accessed, the skew angle θ is zero at the innermost circumferential position of the hard disk 10, but as it is operated toward the outer circumference, the skew angle θ gradually increases. In this example, the slider 1 is installed at an angle to the head support member 2 so that the skew angle θ becomes zero at the innermost circumference of the hard disk 10, so the skew angle θ only changes from zero to positive. . Therefore, as the slider 1 moves from the inner circumference to the outer circumference, its flying height gradually increases due to the increase in circumferential speed, but at the same time, the skew angle θ also increases, so the flying height is canceled out, and as a result, as shown in FIG. To,
The flying height becomes substantially constant from the inner circumference to the outer circumference of the hard disk. As a result, zone bit recording can be used, the storage capacity of the drive can be increased, and high-density recording can be achieved. In addition, the broken line in FIG. 4 shows the change in the flying height of the slider 1 when the skew angle θ is fixed to zero.

Here, for example, the above-described conventional flying magnetic head device shown in FIG. When the rotation center P of the actuator is brought to an extension line in the direction in which the inflow groove 51a is formed, when this slider 52 is accessed,
As in the previous embodiment, the flying height of the slider 52 is approximately constant over the entire recording area of the hard disk 10. However, in this case, the arm length of the actuator becomes longer, and the access time becomes longer due to an increase in the moment of inertia of the arm. On the other hand, if the rotation center O of the actuator is moved to the outer circumferential side of the hard disk 10 as in the previous embodiment, the arm length of the actuator can be shortened, and the access time can be shortened. The flying height of the slider 1 can also be made constant at the same time. Therefore, it is possible to reduce the size of the drive device and also to reduce power consumption.

By the way, in the above-mentioned floating magnetic head device, servo surface servo (a system that uses a dedicated servo surface with servo information) is effective, but data surface servo (a system that uses a dedicated servo surface that has servo information) is effective, but data surface servo (a system that uses a dedicated servo surface that has servo information (a method in which servo information is written to the In other words, since the slider 1 is installed at an angle with respect to the head support member 2, the magnetic field will not be affected by the trajectory of the slider 1 (indicated by the middle line a in FIG. 8), which is operated using the rotation center O of the rotary actuator as a fulcrum. Gap g1 intersects each servo signal track T
When writing servo signals every r, some parts are left unwritten. To prevent this, as shown in FIG. 7, the magnetic gap g should be
must be located.

As a means to solve this problem, for example, as shown in FIG. 5, a parallelogram-shaped slider 11 is used, and as shown in FIG. 6, the skew angle is set to zero at the innermost circumference of the hard disk. Attach it to the head support member 2 at an angle. In this way, the end surface 11a of the slider 11 on which the magnetic head 6 on the air outflow end side is provided is aligned with the slider 1.
1, and the magnetic gap g of the magnetic head 6 provided parallel to this end surface 11a is parallel to the trajectory. Further, in this magnetic head device as well, it is possible to obtain a constant flying height from the inner circumference to the outer circumference of the hard disk 10, as in the previous magnetic head device.

[0018]

As is clear from the above description, in the floating magnetic head device of the present invention, the slider is mounted at an angle to the head support member so that the skew angle is zero at the innermost circumference of the hard disk. Therefore, the flying height of the slider can be made substantially constant from the inner circumference to the outer circumference of the hard disk. Therefore, zone bit recording becomes possible, and the recording density can be greatly improved. Furthermore, in the flying magnetic head device of the present invention, even if the arm length of the actuator is shortened, the flying height of the slider can be made substantially constant over the entire recording area of the hard disk. Therefore, access time can be shortened, and the drive device can be made smaller and consume less power.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view showing a slider portion of a floating magnetic head device to which the present invention is applied.

FIG. 2 is a plan view showing an example of a floating magnetic head device to which the present invention is applied.

FIG. 3 is a schematic diagram showing a state in which a hard disk is accessed by a floating magnetic head device to which the present invention is applied.

FIG. 4 is a characteristic diagram showing changes in the flying height of a slider when a hard disk is accessed by a flying magnetic head device to which the present invention is applied.

FIG. 5 is a plan view showing an example of a flying magnetic head device in which a parallelogram-shaped slider is attached to a head support member.

FIG. 6 is a schematic diagram showing changes in the flying height of a slider when a hard disk is accessed by a flying magnetic head device in which a parallelogram-shaped slider is attached to a head support member.

7 is a schematic diagram showing the locus of the magnetic gap in the floating magnetic head device of FIG. 5. FIG.

8 is a schematic diagram showing the locus of the magnetic gap in the floating magnetic head device of FIG. 2; FIG.

FIG. 9 is a plan view showing an example of a conventional floating magnetic head device.

10 is a schematic diagram showing a state in which a hard disk is accessed by the floating air head device of FIG. 9; FIG.

11 is a characteristic diagram showing changes in the flying height of a slider when a hard disk is accessed by the flying magnetic head device of FIG. 9; FIG.

[Explanation of symbols]

1...Slider 2...Head support member 3...Floating surface 4...Air inflow groove 10...Hard disk

Claims (1)

[Claims] 1. Consisting of a slider for floating a magnetic head with a minute gap with respect to the hard disk, and a head support member for supporting the slider, the slider has a skew angle at the innermost circumference of the recording area of the hard disk. A floating magnetic head device, wherein the floating magnetic head device is mounted on the head support member at an angle so that the angle becomes zero.