JPS5810190Y2 - Head access facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a head access mechanism in a magnetic disk storage device.

Magnetic disk storage is a storage device that consists of a flat disk coated with magnetic material on both sides, with several trunks on each side, and data is stored by a read/write head (hereinafter referred to simply as the head). ) is read from this trunk or written to the track.

In this case, a method is generally adopted in which an arm attached to the head is mechanically moved to access (call) the trunk.

The present invention relates to an improvement of this head access mechanism, and an example of the conventional mechanism will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view, and FIG. 2 is a cross-sectional view thereof.

In Figures 1 and 2, 1 is a magnet, and 2
and 3 constitute a magnetic circuit using electromagnetic soft iron for the back plate and front plate, respectively, and 4 for the center hole also uses electromagnetic soft iron.

5G! The movable frame 5 has a cylindrical shape, and a winding 6 is wound around the outer circumference of the movable frame 5.

A magnetic circuit is constructed to pass magnetic flux between the front plate 3 and the center pole 4.

At the same time, a portion of the winding 6 is arranged in the same gap.

By passing a current through the winding 6, a force is exerted to move the movable frame 5 in the left and right directions in the second drawing, thereby driving the access of a head (not shown) integrally attached to the movable frame 5. Become the source.

However, in the conventional mechanism as described above, electromagnetic soft iron is used for each of the back plate 2, front plate 3, and center pole 4, which increases the weight of the access mechanism as a whole.

In magnetic disk storage devices, especially in the case of random access, all heads use a floating head system, so the weight of the entire head access mechanism is required to be as light as possible.

The special voice coil motor has a distance of several tens of vrm.
It is necessary to move on the order of several tens of meters with a load of 1,000 yen, and the generated force must therefore reach 10 kg.

The coil portion needs to be strong enough to withstand this force.

Naturally, increasing the strength of the coil section will inevitably make the load heavier, and the heavier the weight, the slower the access time will be.
The followability of the head is poor, the drive current is large, and the amount of heat generated is also a problem.

This invention eliminates these conventional drawbacks, and the result is a head access mechanism that has good head followability, is small, lightweight, requires low drive current, and can even shorten access time. The purpose is to provide the following.

As an example of the present invention to achieve the above object, a movable frame is formed by planting a plurality of rectangular insulating substrates radially around a single insulating shaft, and each insulating substrate is moved in the front and back direction. A plurality of magnets that generate a magnetic flux that penetrates the substrate are placed between each insulating substrate, and these magnets are fixedly supported by a fixed frame, and a current in a direction perpendicular to the axis is applied to the printed wiring placed on the board surface of each insulating substrate. A configuration is adopted in which the movable frame is driven in its axial direction by flowing water.

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

In Fig. 3, reference numeral 15 is a movable frame with a plurality of frames (3 in the example).
It is constructed by planting rectangular insulating substrates 1γ, 1γ:1γ〃 on one insulating shaft 18 radially.

11, 11', and 11'' are magnets that generate magnetic flux that penetrates these insulating substrates in the front and back directions;
As shown in the figure, it is arranged between each insulating substrate and fixedly supported by a fixed frame 12.

The movable frame 15 is held movably within the gap formed by these magnets and the fixed frame;
Ru.

As shown in FIG. 4, printed wiring 16 through which a current can flow in a direction perpendicular to the axis is provided on the surface of each insulating substrate 17, 17', 17''.

By passing a current through this printed wiring 16, a driving force in the axial direction is exerted on the movable frame 15 due to the electromagnetic force between it and the magnetic flux generated by the magnets 11, 11', 11''.

In this case, by switching the direction changeover switch SW shown in FIG. 4, the movable frame 15 can be moved either to the left or to the right of the paper in FIG. It can be driven.

Although not shown in the drawings, since the head of the movable frame 15Vc is fixedly attached via an arm, head access is performed in accordance with the movement of the movable frame 15.

As explained above, in the conventional mechanism, electromagnetic soft iron was used in the structure of the magnetic circuit, which inevitably resulted in a large weight and was inconvenient. By using printed broken lines for the conductors, the weight can be significantly reduced, making it possible to reduce the overall weight compared to conventional mechanisms, making it practical. The effect is dog-like.

[Brief explanation of drawings]

Figure 1 is a perspective view of the conventional example, Figure 2 is its cross-sectional view, and Figure 3 is a perspective view of the conventional example.
The figure is a perspective view of one embodiment of the present invention, and FIG. 4 is an enlarged perspective view and an electric circuit diagram of a part thereof. Explanation of symbols, 1...Magnet, 2...
・Pack plate, 3...Front plate,
4... Center pole, 5... Movable frame,
6...Winding, 15...Movable frame, 16.
・-・・・Printed wiring, 11, 11', 11"...
...Magnet, 17, 17', 17'/...
...Rectangular insulating substrate, 18...Insulator shaft, 12
・−・・Fixed frame.

Claims (1)

[Scope of utility model registration request] A plurality of rectangular insulating substrates are arranged radially around an insulating shaft, and a movable frame has an arm supporting a Vcm head coupled to the insulating shaft, and a magnetic flux passing through the insulating substrate in the direction of the plate surface is formed. The movable frame is driven in the axial direction by passing a current perpendicular to the axis through printed wiring placed on the surface of each insulating substrate. A head access mechanism for a magnetic disk storage device, characterized in that it is configured to.