JPH021749Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mounting section for a servo head in a magnetic disk device used as an external storage device of a computer system.

[Technology background]

FIG. 1 is a sectional view showing the internal structure of a sealed magnetic disk unit. 1... is a magnetic disk,
It is fixed to spindle 2. A magnetic head 3 for reading and writing data on the recording surface of each magnetic disk is connected to the head via a gimbal.
The head arm 4 is supported at the tip of an arm 4, and is sought to a predetermined track position on the magnetic disk 1 by rotationally driving the head arm 4 with a motor 6 about a support shaft 5. The spindle 2 is connected to a motor 7, and the motor 7 drives the magnetic disk 1...
is rotated. In the sealed magnetic disk device, the magnetic disks 1..., the magnetic heads 3..., and the movable parts such as the head arms that drive the magnetic heads are housed in a chamber 10 that is sealed with a base 8 and a casing 9. It constitutes a type magnetic disk unit.

[Prior art and its problems]

The interval d between each magnetic disk 1 is constant,
Also, the head arms 4 on which the magnetic heads are mounted all have a constant wall thickness. In a magnetic disk drive, a servo surface is provided, and position information is obtained by reading the servo surface to position the read/write head.
The servo surface is usually provided on the bottom surface of the lowest magnetic disk 1a, and the servo arm 4 is provided on the lowest stage.
A servo head 3a is often mounted on the servo head 3a. Alternatively, instead of providing it at the bottom stage, it may be provided between adjacent magnetic disks 1, 1 like a servo arm 4b, and the servo head 3b may be attached to this servo arm 4b.
It is also done to install. In this way, by providing the servo head 3b between the middle magnetic disks among the plurality of magnetic disks 1, there is an advantage that the deviation between the detected position by the servo head and the target position of the read/write head can be reduced.

However, in either case, the dimensions of the servo arm and read/write arm are the same. In addition, the dimensions of the servo arm and read/write arm are determined based on mechanical strength, prevention of device size increase, and weight reduction. However, since the servo arm controls the heart of position information, if the servo arm vibrates, the reliability of the servo information will decrease, and when seeking the read/write head to the target position, Unreliable servo information will be transmitted to all read/write heads 3, which will reduce the reliability of the entire device.

[Purpose of invention]

The purpose of the present invention is to eliminate such problems in conventional magnetic disk drives, and to make only the servo head less susceptible to vibrations, etc., even when the servo head is placed between adjacent magnetic disks. be.

[Structure of the idea]

The technical means of the present invention taken to achieve this purpose is a magnetic disk drive system with a structure in which a plurality of magnetic disks are mounted on a rotating shaft at intervals, and a servo head is arranged between adjacent magnetic disks. This disk device has a configuration in which the spacing between magnetic disks on which servo heads are arranged is larger than the spacing between magnetic disks on which read/write heads are arranged.

[Example of idea]

Next, how the magnetic disk device according to the present invention is actually implemented will be explained using examples. FIG. 2 is a longitudinal cross-sectional view showing an embodiment of the magnetic disk device according to the present invention, in which parts having the same structure as the conventional magnetic disk device shown in FIG. 1 are given the same numbers.

In the case of the present invention, instead of making the intervals between all the magnetic disks 1 constant, the intermediate servo head 4
Only at position 11 where c should be placed, as shown by D,
The disk spacing d is larger than other disk spacings. Inter-disk position 1 for other read/write head placement only
2... all have a constant dimension d.

Furthermore, in the present invention, not only the disk spacing in the servo head arrangement section is widened, but also the wall thickness of the servo arm 4c that supports the servo head 3c is made larger than that of other read/write head arms 4. . Therefore, the strength of the servo arm increases, making it less susceptible to the effects of vibrations and the like, making it possible to prevent the reliability of servo information from decreasing due to vibrations. That is, the problem of lowering the reliability of positioning of all read/write heads supported by other read/write arms due to the weak strength of one servo arm is solved.

The head arm 4, which is dedicated to read/write heads, has a thinner wall thickness as before.
If all the heads and arms are made thicker, the weight will increase, and the drive motor 6 must also have a large capacity. In addition, if the other head arms 4 are made thicker and the spacing between all the disks is widened, there is a problem that the entire magnetic disk device becomes larger, but in this invention, the wall thickness is increased and the spacing between the disks is widened. Since there is only one location on the servo head side, an increase in weight and an increase in external size can be minimized.

[Effect of idea]

As described above, according to the present invention, only the servo arm on which the servo head is mounted is thickened to increase its strength, and it is possible to prevent servo information from becoming distorted due to vibration. The reliability of read/write head positioning is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a conventional magnetic disk device, and FIG. 2 is a vertical sectional view showing an embodiment of the magnetic disk device according to the present invention. In the figure, 1 is a magnetic disk, 3 is a lead
4 is a head arm for a read/write head; 3a, 3b, and 3c are servo heads; 4a, 4b, and 4c are servo arms; and 6 is a carriage drive motor.

Claims (1)

[Scope of utility model registration request] A magnetic disk device having a structure in which a plurality of magnetic disks are mounted on a rotating shaft at intervals, and a servo head is arranged between adjacent magnetic disks, and the magnetic disk spacing in which read/write heads are arranged. A magnetic disk device characterized in that the spacing between magnetic disks in which servo heads are arranged is larger than that of the magnetic disk device.