JPS5814468Y2 - magnetic disk storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk storage device, and more particularly to a magnetic head positioning device.

Conventionally, in disk devices with replaceable recording media,
The head positioning mechanism is fixed to the device.

Therefore, in order to prevent positional deviations that occur when the recording medium is replaced, etc., a complicated and expensive head positioning servo mechanism is provided.

Furthermore, since high positioning accuracy is required, there are drawbacks such as difficulty in improving bit density.

An object of the present invention is to provide a magnetic disk storage device equipped with a magnetic head positioning device that has a simple configuration and enables highly accurate positioning.

The present invention is characterized by: a magnetic disk, a first rotating means for holding and rotating the magnetic disk, a second rotating means disposed at the center of the magnetic disk;
a positioning rotation member having a spiral guide means held by the second rotation means; an access member engaging the spiral guide means of the positioning rotation member;
a magnetic head attached to the access member;
The magnetic disk and the magnetic head positioning device are used as a replacement unit, and the access member is driven by the spiral guide means by rotating the positioning rotating member by the second rotating means, and the magnetic head is moved through the access member. and positioning the magnetic disk at a desired trunk of the magnetic disk being rotated by the first rotating means.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 1, 10 is a cover in which a magnetic disk 12 fixed to a hub 11 is accommodated.

The magnetic disk 12 is held in the nozzle 11 by inserting its outer peripheral portion into a groove formed in the nozzle 11.

The nozzle 11 is attached to a drive shaft 13, and when the drive shaft 13 rotates, the nozzle 11 and the disk 12 rotate.

A bearing is provided between the hub 11 and the cover 10, so that the hub 11 can be moved without affecting the cover 10.
only rotates.

A magnetic head 14 for recording and reading data on the surface of a magnetic disk is attached to an access rod 16 by a Herad spring 15, and the access rod 16 is attached to an access plate 18.
is fixed.

The access rod 16 is housed in the holder 11 and the holder 1
7 and move inside the holder.

One end of the holder 17 is fixed to the cover 10, and is prevented from being rotated in the circumferential direction of the magnetic disk 12 by movement of the access rod 16.

The holder 17 is shown in FIG. 2. The holder 17 is formed into a cylindrical shape, and grooves A are cut in the upper and lower surfaces of the holder 17. The magnetic head 14 and the head spring 15 protrude outside the holder 1γ from the grooves A.

The tip of the access plate 18 is fitted into a spiral groove B cut in the positioning disk 19 as shown in FIG.
It will be done.

The positioning disk 19 is attached to the rotating shaft of a pulse motor 20 as shown in FIG. 1, and rotates when the pulse motor 20 is driven.

The pulse motor 4 is fixed to a recessed portion (center portion) of the cover 10.

The center part of the cover 10 corresponds to the hole in the center of the magnetic disk 12, and the pulse motor 20 is installed in this part.
By arranging this, the entire magnetic disk device can be made compact.

As the pulse motor 20 rotates, the positioning disk 19 rotates, and the access plate 18 that engages with the spiral groove B moves in the radial direction of the magnetic disk 12.
The access rod 16 fixed to the access plate 18 also moves in the radial direction of the magnetic disk 12.

Therefore, the magnetic head 1 attached to the access rod 16
4 also moves on the magnetic disk 12 in its radial direction.

By controlling the rotation angle and rotation direction of the pulse motor 20, the magnetic head 14 can be positioned on a desired track on the magnetic disk 12.

The magnetic head 14 is connected to the magnetic disk 1 by a helad spring 15.
2. Load the above.

The curve of the spiral groove B of the positioning disk 19 is set such that, for example, the access plate 18 moves by one track for each operation of the pulse motor 20 (rotation by a set rotation angle).

Forming the spiral groove B in the positioning disk 19 is easily possible using a well-known technique (such as milling).

Furthermore, compared to a conventional positioning mechanism using a voice coil motor or the like, this device not only has an extremely simple structure and is inexpensive, but also has high positioning accuracy because it is regulated by a spiral groove.

In addition, the material of the positioning disk can be selected arbitrarily.
In particular, by selecting the coefficient of thermal expansion in relation to other members, it is also possible to minimize track positional deviations due to thermal expansion.

In the embodiment shown in FIG. 1, when replacing the magnetic disk 12, the entire head positioning device is replaced.

Therefore, highly accurate positioning is possible, which makes it easier to improve the bit density, and it is now possible to lower the dimensional accuracy of parts for the same bit density.

As described above, the positioning device of the present invention has a simple configuration and is inexpensive, so it is ideal for magnetic disk devices and fixed disk devices where the head positioning device is replaced as a unit, but it is not limited to this, because it has high positioning accuracy. It is applicable to all magnetic disk devices.

Above all, it has the practical advantage of being low-priced.

As described above, according to the present invention, it is possible to obtain a magnetic disk storage device having a simple configuration, low cost, and equipped with a highly accurate magnetic head positioning device.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the present invention, FIG. 2 is a plan view showing details of an access rod, and FIG. 3 is a plan view showing details of a positioning disk. 10...cover, 11...no-bu, 1
2...Magnetic disk, 13...Drive shaft, 14...Magnetic head, 15...Head blade, 16...Access rod, 1T・・・・・・
・Holder, 18...Access board, 19...
...Positioning disc, 20...Pulse motor, B...Spiral groove.

Claims (1)

[Scope of utility model registration request] a magnetic disk whose outer periphery is held by a hub and surrounded by a cover; a first rotation means for rotating the magnetic disk via the hub; and a hole in the center of the magnetic disk and the cover. a positioning rotary member having a second rotation means disposed above, a spiral guide means held by the second rotation means, and engaged with the spiral guide means of the positioning rotation member; and a magnetic head attached to the access member, the magnetic disk and the magnetic head positioning device are used as a replacement unit for the first rotation means, and the positioning rotation member is used as a replacement unit for the first rotation means. The access member is driven by the spiral guiding means by rotating the access member, and the magnetic head is positioned via the access member at a desired track of the magnetic disk being rotated by the first rotating means. magnetic disk storage device.