JPH02216681A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To increase the seek speed and to accurately record and reproduce data by moving two magnetic heads, which are arranged in the front end of a supporting member, on corresponding areas on the surface of a magnetic disk divided into two in the diametral direction. CONSTITUTION:Movement in the diametral direction of a magnetic disk 8 is controlled through a voice coil 14 by a controller 15, and a magnetic head 9 arranged on the inner side out of two magnetic heads 9 and 10 supported by one carriage arm 11 records and reproduces data in the half inner peripheral area of the magnetic disk 8. The magnetic head 10 arranged on the outer side records and reproduces data in the half outer peripheral area of the magnetic disk 8. Thus, the seek time is shortened to a half of the conventional seek time because the extent of movement of magnetic heads 9 and 10 is reduced to an about hall in comparison with a conventional magnetic disk device. Since the azimuthal angle is averaged for each cylinder, accurate recording and reproducing are possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic disk device in which seek (search) speed is increased.

(Prior Art) Magnetic disk drives have conventionally been used as external storage devices for information processing equipment such as computers and word processors.

FIG. 5 shows the configuration of the main parts of a conventional magnetic disk device.

In the figure, numeral 1 is a magnetic disk which is a medium on which data is recorded, 2 is a magnetic head that records and reproduces data on the magnetic disk 1, and 3 is a carriage arm that is disposed facing the surface of the magnetic disk 1 and supports the magnetic head 2. , 4 is a suspension that connects the magnetic head 2 to the carriage arm 3, 5 is a pivot that is an axis around which the carriage arm rotates, and 6 is a voice coil that drives the carriage arm 3 to rotate around the pivot 5.

In such magnetic disk drives, the demand for faster seek times has been conventionally met by increasing the amount of current flowing through the voice coil 6 and increasing the moving speed of the carriage arm 3.

However, since the magnetic head 2 must be positioned with high precision with respect to each of a plurality of cylinders that are a collection of tracks of a plurality of magnetic disks 1, there is a limit to the means for increasing the moving speed of the carriage arm 3. , This alone was not able to sufficiently respond to the increase in seek time.

In addition, as density increases, the data array spacing on the magnetic disk 1 becomes narrower, so that recording and reproduction are more susceptible to the influence of the azimuth angle α, as described below.

That is, as shown in FIG. 6, the magnetic head 2 is supported by the carriage arm 3 and moves in an arc around the pivot 5, moving from the innermost circumference to the outermost circumference of the magnetic disk 1 in a radial direction. Seek to. At this time, the angle formed by the magnetic gap of the magnetic head 2 and the tangent to the cylinder 7 is called the azimuth angle α, and the closer this angle is to 06, the more accurately data can be recorded and reproduced. However, in conventional magnetic disk drives, Since one magnetic head 2 moves on the surface of the magnetic disk 1 from the innermost circumference to the outermost circumference, the azimuth angle α becomes larger at the periphery, and the more densely arranged data is, the more susceptible to this effect it is. There was a problem.

(Problems to be Solved by the Invention) As described above, in conventional magnetic disk drives, when the moving speed of the carriage arm is increased in response to faster seek times, accurate positioning of the magnetic head becomes difficult.

Furthermore, since one magnetic head performs recording and reproduction on all tracks and all cylinders, there is a problem in that the azimuth angle becomes large at the periphery, making accurate recording and reproduction impossible.

The present invention has been made to solve these problems, and an object of the present invention is to provide a magnetic disk device that can speed up seek and accurately record and reproduce data.

[Structure of the Invention] (Means for Solving the Problems) A magnetic disk device of the present invention includes a magnetic disk, a support member disposed facing a surface of the magnetic disk, and a support member disposed at the tip of the support member. two magnetic heads, a moving means for moving the support member substantially in the radial direction of the magnetic disk, and each of the magnetic heads moves respectively in corresponding areas of the surface of the magnetic disk divided into two in the radial direction. The present invention is characterized in that it comprises a control means for controlling the moving means.

(Function) In the magnetic disk device of the present invention, two magnetic heads attached to the tip of one support member with a slight distance from each other are attached to corresponding areas of the surface of the magnetic disk divided into two in the radial direction. Since the magnetic heads move respectively, the moving distance of each magnetic head becomes approximately half of the moving distance in a conventional magnetic disk device, and the time required for seeking is reduced by approximately half.

Furthermore, since the azimuth angle is averaged for each of the plurality of cylinders of the magnetic disk, it is possible to accurately record and reproduce data.

(Example) Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a plan view showing an embodiment of the magnetic disk device of the present invention.

In the figure, reference numeral 8 indicates a magnetic disk which is a medium on which data is recorded and is rotated by a motor such as a spindle motor, and 9 and 10 indicate magnetic heads for recording and reproducing data on the magnetic disk 8, respectively.

Further, 11 is a carriage arm that is a support member for these magnetic heads, 12 is a suspension that connects each magnetic head 9.10 to the carriage arm 11, 13 is a pivot that is an axis around which the carriage arm 11 rotates, and 14 is a carriage arm 11. 15 is a control device.

The movement of the carriage arm 11, that is, the magnetic disk 8
The radial movement of one carriage arm 11 is controlled by a control device 15 via a voice coil 14.
The magnetic head (1) 9 placed on the inside of the two magnetic disks 9 and 10 supported by the disk records and reproduces data in the inner half area of the magnetic disk 8, and the magnetic head (1) 9 placed on the outside The magnetic head (2) 10 is configured to record and reproduce data in the outer half area of the magnetic disk 8.

Further, in FIG. 2, which is an enlarged view of the installation of these magnetic heads 9 and 10, reference numeral 16 indicates the suspension 12.
The gimbal is a spring member attached to the tip of the gimbal, 17 indicates a slider attached to the gimbal 16 in parallel with the gimbal, and the two magnetic heads 9 and 10 have the following positional relationships with respect to the pivot 13. They are each fixed to the slider 17 so that they are as shown in FIG.

That is, as shown in FIG. 3, if the angle formed by the two lines connecting the pivot 13 and the positions of the corresponding magnetic helads 9 and 10 on the innermost and outermost peripheries of the magnetic disk 8 is θ, then , 1/4 outward and inward from these lines, respectively.
Magnetic head (1) 9 and magnetic head (2) are placed at θ.
) 10 are arranged, and the angle between each magnetic head is 1.
/2θ.

In the magnetic disk drive of the embodiment configured as described above, the carriage arm 11 rotates around the pivot 13 by passing a current through the voice coil 14, and thereby the two carriage arms supported by the gear ridge arm 11 rotate. Although the magnetic heads 9 and 10 rotate, the control device 15
Since the operation of the voice coil 14 is controlled by
10 moves in the area from the middle circumference to the outermost circumference. In this way, an appropriate magnetic head is selected and seek is performed depending on the position of the cylinder, so that the distance traveled by each magnetic head 9, 10 in the radial direction of the magnetic disk 8 can be reduced to approximately the distance traveled by a conventional magnetic disk drive. Can be halved.

In addition, in the magnetic disk drive of the embodiment, as shown in FIG. 4, the angle between the magnetic gap of each magnetic head and the tangent line of the corresponding cylinder, that is, the azimuth angle α, is averaged from the inner circumferential side to the outer circumferential side. Since this value is close to 0@, accurate recording and reproduction of data is possible.

In the figure, a-e indicate the tangent lines to cylinders 1 to 5, respectively, A and B indicate the direction of the magnetic gap of the magnetic head (1) 9 in cylinders 1 and 2, respectively, and C-E indicate the direction of the magnetic gap of the magnetic head (1) 9 in cylinders 1 and 2, respectively. 5 shows the direction of the magnetic gap of the magnetic head (2) 10 in FIG.

Further, in the present invention, it is desirable that the two magnetic heads 9, 10 are arranged at unequal distances from the pivot 13.

In this case, the azimuth angle α for each cylinder from the innermost circumference to the outermost circumference does not change drastically, so that data can be recorded and reproduced at the position where the corresponding magnetic head gap is the best. It has the advantage of being able to

[Effects of the Invention] As explained above, in the magnetic disk device of the present invention, the moving distance of each magnetic head is approximately half that of the conventional magnetic disk device, so the seek time can be reduced to 1/2 compared to the conventional magnetic disk device.
/2.

Furthermore, since the azimuth angle is averaged for each cylinder, accurate recording and reproduction can be performed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic disk device of the present invention, FIG. 2 is a partially enlarged view of this embodiment, and FIG. 3 is an enlarged view of the mounting position of the magnetic head in the same embodiment. 4 is an explanatory diagram showing changes in azimuth angle in the same embodiment. FIG. 5 is a plan view showing main parts of a conventional magnetic disk device. FIG. 6 is a diagram showing problems in a conventional magnetic disk device. FIG. 8...Magnetic disk, 9.10...Magnetic head, 1
DESCRIPTION OF SYMBOLS 1... Carriage arm, 3... Pivot, 4... Voice coil, 5... Control device.

Claims (1)

[Claims] (1) A rotating magnetic disk, a support member disposed facing the surface of the magnetic disk, two magnetic heads disposed at the tip of the support member, and the support member arranged around the diameter of the magnetic disk. and a control means for controlling the moving means so that each of the magnetic heads moves in a corresponding area of the surface of the magnetic disk divided into two in the radial direction. A magnetic disk device characterized by: