JPS62141623A - Head support swing mechanism of magnetic disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a head support swing mechanism for a magnetic disk device, and in particular to a head support swing mechanism related to the arrangement of a flexible cable connecting a head and a circuit board. Regarding improvements to the mechanism.

[Background of the invention]

A conventional head support swing mechanism is, for example, disclosed in Japanese Patent Application Laid-Open No. 56-1
No. 30865 and JP-A No. 57-56373. FIG. 4 shows a typical structure of a conventional head support swing mechanism including these. A U-shaped support block 1 supports both ends of a carriage shaft 2 via rolling bearings 3. A carriage block 4 is fixed to the carriage/gift 2, and a plurality of head bars 5 are attached to the carriage block 4.
is fixed. A recording/reproducing head 8 is attached to the tip of each head bar via a gimbal. A voice coil motor 7 is placed on the opposite side of the carriage shaft 2 from the head bar 5. Due to the energization of the voice coil motor 7, the head carriage (carriage head 8) moves along the disk surface as shown by arrow 6.

Each head 8 is connected to a switching circuit board 9 fixed to the carriage block 4, and other circuit boards (not shown) are connected to the switching circuit board 9 via a flexible cable/pull cable 10.
For example, it is connected to a preamplifier board. In order to reduce the range of movement of the flexible cable caused by the swinging motion of the head carriage as much as possible, the flexible/pull cable should be The cable IO passes between the support block 1 and the carriage block, bypasses the column IA of the support block 1, and takes a U-shaped route. The curvature of this U-shaped portion is desired to be as large as possible for the above-mentioned purpose.

In a conventional magnetic disk drive, the side surface of the voice coil motor 7 is spaced by a dimension 31 from the surface of the column IA of the support block.
By pulling in only the flexible cable 10
Such a route as described above is easily realized. Furthermore, in the case of a large device, there is plenty of space, so it is relatively easy to create an appropriate route for the flexible cable. However, in small devices, space is limited and the dimensions, shapes, and arrangement of various parts are critical, so flexible
There are many difficulties in securing the required route for the pull cable.

Especially when high access speed is required (recent 5-inch disk drives require a capacity of over 100 megabytes and an average access time of about 25 milliseconds).
In this case, the voice coil motor 7 becomes large-sized, and the above-mentioned retraction dimension 31 cannot be provided, and on the contrary, the voice coil motor 7 protrudes greatly. In this state, the flexible cable 10 is connected to the U-shaped path as shown in FIG.
In order to provide this, the portion of the pillar portion IA of the support block on the voice coil motor 7 side must be sharply shaved off. However, such a change in the shape of the support block 1
significantly reduces the stiffness of A head support rocking mechanism for high-speed access must have high rigidity sufficient to withstand high-speed rocking.

[Purpose of the invention]

An object of the present invention is to provide a head support swing mechanism that provides the necessary path and movement space for the flexible cable connecting the head carriage and the circuit board, and has sufficiently high rigidity, even in a small high-speed magnetic disk drive. , to provide.

[Summary of the invention]

According to the present invention, the pillar portion of the support flock that supports the carriage shaft is provided with an opening through which the funkin pull cable passes. In other words, the support block according to the invention has two pillars, and the flexible/pull cable passes through the space between these two pillars. This structure allows the flexible cable to have a route that is not obstructed by the large voice coil motor, and also has a semi-column structure in which the pillars of the support block are largely shaved off as described above, and a relatively soft 1~. The support block can have high rigidity.

In order to keep the opening as small as possible and to facilitate assembly, it is advantageous to provide a slit extending from the bottom surface fixed to the base to the opening as an insertion passage for the flexible cable.

[Embodiments of the invention]

Figures 1-3 generally illustrate one embodiment of the invention. Fig. 1 is an exploded perspective view of the head support swing mechanism, and Fig. 2 is a cross-sectional view of the support block taken along the plane AA' in Fig. 1, with the cover of the third same-sex magnetic disk drive removed. It is a top view in a state. In FIG. 3, the support block is depicted in partial section. In these figures.

Reference numerals 2 to 10 indicate parts or items corresponding to those indicated by the same reference numerals in FIG. However, the details of these parts are not necessarily the same. The support block labeled l in FIG. 4 is designated by 19 in these figures. Code 7A in Figures 1 and 3
The component indicated by is the coil of the voice coil motor 7.

Similar to the mechanism shown in FIG. 4, the entire head carriage (carriage 4 and head bar 5 fixed thereto) and head 8 attached thereto move in a voice coy manner. As a result, the head 8 moves along the surface of the disk 11 in the direction of the arrow 6 and is positioned on the designated track. The disk 11 is rotated by a spindle motor 12.

As is well known, the head 8 has a structure that maintains a small gap between it and the surface of the rotating disk by aerodynamic action.

A flexible/pull cable 10 connected to the head 8 and extending from the switching circuit board 9 fixed to the carriage block 4 is fixed to the carriage block 4 by a holding metal fitting 13, bent into a U-shape from there and connected to the preamplifier board 14. reach In order to make the curvature of this U-shaped part as narrow as possible, no circuit element is mounted on the part of the read/write circuit board 15 that is attached to this U-shaped part, and the wall of the pace 16 is bent in this part. Then, a space 32+ is formed in which the U-shaped portion of the flexible/pull cable 10 is accommodated. The four corners of the base 16 are recessed by a dimension 18 in order to insert a vibration-proof rubber piece 17 between the pace 16 and the outer case to protect the device from external vibrations and shocks.

As mentioned above, a large voice coil motor 7 is used in a small device.
When a flexible cable is installed, it is difficult to secure a route for the flexible cable. As shown in FIGS. 1 and 2, the support block 19 according to the present invention has an opening 20 in its column portion, through which the flexible cable 10 passes. In other words, the column portion of the support block 19 consists of two columns 19A and 1913, and a space for the flexible/pull cable is formed between them. Dimensions of opening 20 24.
25 must be sufficient to allow the flexible cable 10 to move freely as the head carriage swings. On the other hand, it is desirable that these dimensions be as small as possible in order to prevent the rigidity of the support block 19 from decreasing due to shock force. The switching circuit board 9 and the preamplifier board 14 must have widths 21 and 22 sufficient to mount necessary circuit elements. However, flexible cable 10idfi
Since it only includes the printed circuit pattern for the line, its width 23 can be made sufficiently small. It is sufficient that the vertical dimension 24 of the opening 20 is slightly thicker than the width 23 of the flexible cable 10.

If the flexible cable 10 and the preamplifier board 14 are connected via a connector or the like and can be separated by one,
First, the flexible cable 10 can be passed through the opening 20 and then connected to the preamplifier board 14 via a connector.

However, the flexible cable is fixedly attached to the circuit board. In that case, the preamplifier board 14, which is wider than the flexible/pull cable 10, cannot pass through the opening 20 having the above dimensions. Therefore, assembly problems arise. To solve this problem, a slit 26 is provided that reaches from the bottom of the support block 19 to the opening 20, through which the flexi pull cape is positioned at a predetermined location and then opened at 27.28°2.
9.30 is a screw hole 27N drilled at the bottom of the support block 19 through the bottom plate of the base 16.

They are tightened to 28A, 29A, and 30iL respectively.

In this way, the two parts separated by the slit 26 are each fixed to the bottom plate of the pace 16, thereby compensating for the decrease in rigidity caused by the restriction of the slit 26.

In the embodiment described above, the opening 20 in the support block is
Vacant space 32 that can be formed by placing parts on the circuit board
Combined with this, it provides sufficient space for flexible cables. The slit 26 in the bottom of the support block facilitates assembly, and the loss of stiffness caused by the slit is compensated for by the anchoring of the bottom of the support block to the base.

〔Effect of the invention〕

According to the present invention, even in a small ++ Ti disk device equipped with a large voice coil motor, it is possible to provide the necessary route and space for the flexible/pull cable (high movement space). It is possible to provide sufficient rigidity. Therefore, it becomes easy to realize a compact high-speed access magnetic disk device.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of flFIJ, one embodiment of the present invention;
The figure is a sectional view taken along the line AA' of the support block in FIG. 1, and FIG. 3 is a magnetic disk including the embodiment of FIG. FIG. 3 is a plan view of the disk device with the cover removed. FIG. 4 is a perspective view of a conventional head support swing mechanism. 2... Carriage shaft, 4... Carriage block, 5... Head bar, 7... Voice coil motor,
8...Head, 10...7 Receiver/pull cable, 1
9. Support block, 20. Opening, 26. Slit.

Claims (1)

[Claims] 1. A head carriage that holds a recording/reproducing head for a magnetic disk at one end and can swing around a shaft, a drive device that applies a swinging force to the other end of the head carriage, and a drive device that supports the shaft. and a flexible cable extending from the head carriage to a circuit board, characterized in that the support block has an opening in a column portion thereof through which the flexible cable passes. 2. In claim 1, the support block is
A head support swing mechanism further comprising: a slit extending from a bottom surface of the mechanism to the opening as an insertion path for the flexible cable into the opening, and the bottom surface of the mechanism is fixed to a base.