JPH0325769A - Head supporting device - Google Patents

Abstract

PURPOSE:To stably obtain the low contact force of a head and to attain simple manufacture process, miniaturization, and a low cost by superimposing an auxiliary flat spring on the base part side of a main flat spring on whose tip the head is mounted, and fixing them mutually. CONSTITUTION:The main flat spring 11 is formed by molding integrally a pair, upper and lower, parallel flat springs 12 with a base part side connecting plate 13 and a tip part side connecting plate 14 which connect the base part sides 12a and tip part sides 12b perpendicularly. The auxiliary flat spring 17 is formed by molding integrally a pair, upper and lower, parallel flat springs 18 with a base part side connecting plate 19 which connects the base sides 18a perpendicularly, and a notched part 20 is provided at tip part sides 18b, and the connecting plates 13 and 19 are tightened with screws, which forms double flat spring structure. Thereby, the spring constant of the base part side 12a is set larger than that of the tip part side 12b of the pair of parallel flat springs 12 of the spring 11. Therefore, it is possible to stably obtain the low contact force of the head 23 mounted at the tip part side 12b for a disk.

Description

Detailed Description of the Invention [Field of Industrial Application] The present BA relates to a support device for a recording and/or reproducing head that is most suitable for application to a recording and reproducing device for a disk-shaped recording medium, such as a FLJ. be.

[Summary of the invention]

The present BA is a head support device that supports a head for recording and/or reproducing a recording medium such as a disk-shaped recording medium at the tip of a leaf spring, in which the base side of the leaf spring has a double leaf spring structure. This makes it possible to improve the ability of the head to follow large surface runout of the recording medium.

[Conventional technology]

Japanese Patent Laid-Open No. 55-22296 discloses a conventional technology for a head support device that supports a head for recording and/or reproducing a disk-shaped recording medium at the tip of a leaf spring.

As shown in FIG. 6, this conventional head support device consists of a leaf spring 1 having an elastic portion 2 on its base side, and a pair of folds bent upward at right angles along both left and right edges on the tip side. The bent edge 3 is shaped and its tip side is formed into a rigid part 4, and a recording and/or reproducing head 5 is attached to the tip of the rigid part 4.
The elastic part 2 is fixed to a head support 6 with screws 7, and the head 5 is rotated by the head support 6 in the direction of arrow a, which is the radial direction of a disk-shaped recording medium (hereinafter simply referred to as a disk) 8. The disc 8 is configured to perform recording and/or reproduction by scanning the disc 8.

In response to surface runout of the disk 8, the leaf spring 1 is configured to flex in the direction of the arrow b at the elastic portion 2 on the base side, as shown by the dashed line.

[Problem to be solved by 8J4] However, the conventional head support device has a problem in that when the surface runout of the disk 8 is large, the followability of the head 5 with respect to the disk 8 deteriorates.

That is, conventionally, the swing fulcrum of the leaf spring 1 is the elastic part 2 on the base side.
At one point, the contact force of the head 5 with the disk 8 is determined by the spring constant of the elastic portion 2. Therefore, the contact force of the head 5 with respect to the disk 8 is low (the head 5
In order to hold the head 5 at a constant position relative to the disk 8 so that the head 5 does not come into contact with the disk 8 more strongly than necessary, the thickness of the elastic portion 2 is increased to increase the repulsion constant of the elastic portion 2. Then, it becomes impossible to obtain a large amount of displacement of the head 5 in the direction of arrow b.

Therefore, considering the large surface runout of the disk 8, the elasticity s
It is desirable to reduce the thickness of the elastic portion 2 so that the spring constant of the elastic portion 2 is small and the amount of displacement of the head 5 in the direction of arrow b can be increased.

However, if the spring constant of the elastic part 2 is made too small, it becomes impossible to obtain a low contact force of the head 5 with respect to the disk 8. Moreover, by reducing the spring constant of the elastic part 2 on the base side of the leaf spring 1, the large surface runout of the disk 8 causes the entire leaf spring 1 to vibrate due to circular motion in the direction of arrow b, centering on the elastic part 2. This may result in poor contact of the groove 5 with the disk 8, tracking deviation or jitter of the head 5, or arrow a on the head 5.
Problems such as directional scanning becoming unstable tend to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head support device that can obtain a low contact force of the head with respect to a recording medium and also allows the head to follow a large surface runout of the recording medium.

[Means to solve the problem]

In order to achieve the above object, a head support device according to claim 1 of the present invention. In this example, an auxiliary leaf spring is stacked on the base side of a main leaf spring with a head attached to its tip and fixed to each other.

1. In the head support device according to claim 2, the main leaf spring and the auxiliary leaf spring are each formed into a pair of parallel leaf springs integrally formed from a single leaf spring material, and the pair of parallel leaf springs of the fresh spring material A pair of parallel leaf springs of the auxiliary leaf spring are stacked on the base side of the leaf spring and fixed to each other.

[For production]

The head support device according to claim 1 configured as described above,
Since the base side of the main leaf spring to which the head is attached at the tip has a double leaf spring structure with the auxiliary diagonal spring, the spring constant on the base side is larger than that at the tip of the main leaf spring. Therefore, it is possible to obtain a low contact force of the head with respect to the recording medium.

In addition, the head can be made to follow small surface runouts of the recording medium by the tip side of the main leaf spring with a small spring constant, and the head can be made to follow a small surface runout of the recording medium by the base side of the main leaf spring with a large spring constant. The head can be followed by the head.

In the head support device of claim 2, the pair of parallel leaf springs, the main leaf spring and the auxiliary leaf spring, each formed integrally with a single leaf spring material, are stacked and fixed to each other, so that the head is lowered relative to the recording medium. A stable contact force can be obtained, and the head is moved in parallel by the pair of parallel leaf springs, the main leaf spring and the auxiliary leaf spring, and these pair of parallel leaf springs have extremely high rigidity against torsion. . Therefore, it is possible to reduce tracking deviation, jitter, etc. caused when the recording medium has a large surface vibration t'L or when the head scans.

[Example 1] Hereinafter, an example in which the present invention is applied to a head support device in a recording/reproducing apparatus for a disk-shaped recording medium will be described with reference to the drawings.

1. As shown in FIG. 1, the main leaf spring 11, which is press-formed from one piece of leaf spring material, has a pair of upper and lower parallel leaf springs 12, and a space between the base side 12a and the tip side 12.
A base side connecting plate 13 and a tip side connecting plate 14 that vertically connect between the two connecting plates 13,
An opening 15 is provided between the openings 14. 1. An auxiliary leaf spring 17 that is pressed from a single leaf spring material 16.
is a pair of upper and lower parallel plate springs 18 and their base gA1
A base-side connecting plate 19 that vertically connects 8a is formed integrally with the base side connecting plate 19, and a notch 2 is formed between the tip side 18b.
It has a mouth. In addition, both base side connecting plates 13, 19
A plurality of holes 21 and 22 are provided for screw fixing. Both leaf spring materials 10.16 are made of SOS (C stainless steel) 'PBe' having a thickness of, for example, 10 μm or more.
Various metal plates such as Cu (beryllium copper) material are used. The total length AI of the main leaf spring 11 is, for example, about 10 to 43 mm, and the maximum width W is, for example, about 4 to 6 mm. 2, l3 are arranged to have approximately the same length, and the total length l4 of the auxiliary leaf spring 17 is, for example, 2 to 3 mm.
That's about it. The pair of parallel leaf springs 12 of the main leaf spring 11 exert a parallel leaf spring action on the length of the opening i-3 1 5 - e5, and the pair of parallel leaf springs 18 of the auxiliary leaf spring 17 exerts a leaf spring action over 16 lengths of the notch 20 on the tip end side iBb.

Next, as shown in FIGS. 2 to 5, the auxiliary leaf spring 17 is fitted inside the base side 12a of the pair of parallel leaf springs 12 of the main leaf spring 11, and the pair of parallel leaf springs 18 are fitted. The pair of parallel plate springs 12 are stacked on the inner surface of the base M side 12a, and the base i connection plate 19 is stacked on the inner surface of the base side connection plate 13, and these parallel plate springs 12, 18 and both base side connection Board 16
, 19 are fixed to each other by, for example, ultrasonic welding or JP bonding. Then, a recording and/or reproducing head 23 such as a magnetic head is vertically fixed to the side surface of the connecting plate 14 on the tip end side of the main leaf spring 11 by adhesive or the like, and the raw leaf spring 1
1 and the auxiliary leaf spring 170 and both base side connecting plates 13 and 19 are fixed to the head support body 24 by a plurality of screws 25 inserted through a plurality of holes 21 and 22. Note that the connecting plate 14 on the distal end side of the main temporary spring 11 is supported by the head support body 24 via a pair of upper and lower dampers 26 so as to be movable within a certain range in the vertical direction.

The head 17 is brought into vertical contact with the surface of a disk-shaped recording medium (hereinafter simply referred to as a disk) 27 such as an SSR (stretched surface record), and the disk 27 is moved by a spindle 28, for example, by an arrow C. The head 23 is scanned by the head support 24 in the direction of the arrow a, which is the radial direction of the disk 27, while being rotated at a high speed of, for example, 3.60 rpm. is configured to perform playback.

According to the head support device constructed as described above, when the disk 27 is rotated at a high speed of about 3-60 O rpm, the disk 21 made of SSR causes a surface runout of about 50 μm, and a pair of parallel A housing in which the head 23 maintains perpendicularity to the disk 27 according to the surface runout of the disk 27 by a ten-row swinging motion in which the plate blades 12 and 18 swing in all directions of arrow d while maintaining a parallel state. 1 to move in parallel in the direction of arrow d.

At this time, the main plate spring 11 with the head 23 attached to the tip
Since the base portion 4aJ12a of the pair of parallel leaf springs 12 is constructed in a double leaf spring structure by the pair of parallel leaf springs 18 of the auxiliary leaf spring 17, the pair of parallel leaf springs 12 of the main leaf spring 11 The proximal side 12b is compared to the distal side 12b. The spring constant of 12a is greatly increased. Therefore, it is possible to stably obtain a low contact force (for example, 0.5 g or less) between the head 2 and the disk 27.Moreover, as shown in FIG. As shown in FIG. 4, the head 23 can be made to follow (slightly move) the disk 27 by the tip N12b having a small spring constant, and in response to a large surface runout of the disk 27 of about 20 to 50 μm, as shown in FIG. The head 23 can be caused to follow (coarsely move) the disk 27 by the base side 12a having a double spring structure with a large spring constant.

In this way, for small surface runout of the disk 27,
The head 23 is slightly moved by the tip side 12b of the pair of parallel leaf springs 12, and in response to large surface runout of the disk 27, the head 23 is moved by the base glJ1 of the pair of parallel leaf springs 12.
2a, the pair of parallel plate springs 12 will not vibrate as a whole due to large surface runout of the disk 27. Therefore, the ability of the head 23 to follow a large surface runout of the disk 27 is improved, and a good contact state of the head 23 with the disk 27 can always be maintained even when the disk 27 has a large surface runout.

Moreover, each one costs 149. The pair of parallel plates 12 and 18 of the main plate spring 11 and the auxiliary plate spring 17, which are integrally molded with the plate spring materials 10 and 16 of Extremely high rigidity against twisting in the direction of arrow e.

Therefore, it is possible to reduce tracking deviations, jitter, etc. that occur when the disk 27 has a large surface runout or when the head 23 scans in the direction of the arrow a.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various effective changes can be made based on the technical idea of the present invention.

The present invention can be applied to support devices for recording and/or reproducing heads of various types of recording media in addition to disk-shaped recording media.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

In the head support device according to claim 1, since the base side of the main leaf spring to which the head is attached at the tip is configured with the auxiliary leaf spring in a double leaf spring structure, the spring on the base side is smaller than the base side of the main leaf spring. The constant becomes larger. Therefore, it is possible to obtain a low contact force of the head with respect to the recording medium. Moreover,
The head can be made to follow a small surface runout of the recording medium by the tip side of the main leaf spring with a small spring constant, and the head can be made to follow a large surface runout of the recording medium by the head side of the main leaf spring with a large spring constant. Since the head can be made to follow the recording medium, there is no need for the entire leaf spring to vibrate due to large surface runout of the recording medium.
The ability of the head to follow large surface runouts of the recording medium is improved, and a good contact state of the head with the recording medium can always be maintained even when the recording medium has large surface runouts.

In the head support device according to the second aspect, since the main plate spring and the pair of parallel plate springs of the auxiliary plate spring, which are each integrally molded from one plate spring material, are stacked and fixed to each other, the contact force of the head with respect to the recording medium is low. can be stably obtained, the head is moved in parallel by the pair of parallel leaf springs of the main leaf spring and the auxiliary leaf spring, and the rigidity of the pair of parallel leaf springs is extremely high. Therefore, it is possible to reduce tracking deviation and jitter when the recording medium has a large surface runout or when the head is scanning, and especially when used as a recording and/or reproducing head for a disk-shaped recording medium, the scanning of the head can be reduced. It can be done stably. In addition, by overlapping and fixing the pair of parallel diagonal springs of the main leaf spring and the auxiliary leaf spring, which are each integrally formed from one sheet of leaf spring material, the spring constant on the basic side of the pair of parallel leaf springs of the main leaf spring can be increased. The structure in which the tip is made larger than the tip side is easy to process, has high mass productivity, and is an optimal structure for downsizing and cost reduction.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is an exploded perspective view of a main leaf spring and an auxiliary leaf spring, and FIG.
The figure is a perspective view of the entire head support device, Figure 3 is a front view illustrating fine movement of the head, Figure 4 is a front view illustrating coarse movement of the head, and Figure 5 is a V-V arrow view of the third cabinet. cross-sectional view, No. 6
The figure is a side view illustrating a conventional example. In addition, in the symbols used in the drawings, 10...
...Plate spring material 11... Main leaf spring 12 ... Parallel leaf spring 12a ... Base side 12b of parallel leaf spring ... Parallel leaf spring Tip side 16...Plate spring material 17...Auxiliary leaf spring 18...Parallel plate spring 23... Head 23... Head support 27... Disk-shaped recording medium.

Claims (2)

[Claims] (1) In a head support device that supports a head for recording and/or reproducing a recording medium at the tip of a leaf spring, an auxiliary leaf spring is stacked on the base side of the main leaf spring to which the head is attached to the end, and the head is mutually connected. A head support device characterized by being fixed. (2) In the head support device according to claim 1, the main leaf spring and the auxiliary leaf spring are each formed into a pair of parallel leaf springs integrally formed from a single leaf spring material, and the main leaf spring is a pair of parallel leaf springs. A head support device characterized in that a pair of parallel leaf springs of the auxiliary leaf spring are stacked on the base side of the parallel leaf spring and fixed to each other.