JPH0793735A - Suspension for magnetic disk and its production - Google Patents

Abstract

PURPOSE:To make a suspension thin, to stabilize levitation characteristics and to reduce cost. CONSTITUTION:A magnetic head 3 is fitted to one end of the body 1 of a suspension made of a thin plate and the suspension for a magnetic disk is disposed so that the head 3 is brought close to a magnetic disk D and kept apart from it. A coated electric wire 5 led from the head 3 is fixed almost parallel to the surface of the body 1 of the suspension wit.h a UV-curing adhesive. A loop shape is imparted to the coated electric wire from the head to the fixing position on the body of the suspension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk suspension for supporting a magnetic head for reading information written on a magnetic disk such as a hard disk drive or for writing information on the magnetic disk, and a method for manufacturing the same. , In particular, by considering the routing of the signal line connected to the magnetic head, a magnetic disk suspension and a suspension thereof for increasing the capacity of the magnetic disk, stabilizing the floating characteristics of the magnetic head, and preventing disconnection of the signal line are provided. It relates to a manufacturing method.

[0002]

2. Description of the Related Art In a hard disk drive used as a recording medium, a magnetic head supported by a suspension is provided between a plurality of stacked magnetic disks. In a so-called floating magnetic head device, when the magnetic disk rotates, a buoyant force acts on the magnetic head from the surface of the magnetic disk, thereby reading information written on the magnetic disk and writing information on the magnetic disk.

In this type of hard disk drive, signal lines for guiding the magnetic signal detected by the magnetic head to the reading device or for outputting the magnetic signal from the writing device to the magnetic head are read / written by the magnetic head. It must be installed between the plug-in device and the plug-in device.

Therefore, in the conventional hard disk drive, a wire wire (electric wire coated with a thin insulating film is formed on a suspension that supports a magnetic head.
Hereinafter, it is also referred to as a covered electric wire. ) Is also supported. Specifically, as shown in FIG. 6, a flange 21 for crawling the covered electric wire 20 is formed on the side edge of the suspension body 1 made of a thin stainless steel plate, and the hook 2 is further formed.
It is fixed by 2. However, since the covered electric wire is fixed to the suspension by caulking the hook, it is necessary to prevent the hook from damaging the insulating film. For this reason, in the conventional coated electric wire, at least the outer surface of the attachment range to the suspension is further covered with the insulating tube 23, with the expectation that the reliability regarding the insulation property is further enhanced.

[0005]

By the way, in order to simultaneously realize the two demands of downsizing the drive body and increasing the capacity of the magnetic disk in the hard disk drive, a large number of magnetic disks are provided in a predetermined space. Is needed. Therefore, it is necessary to thin the suspension provided between the magnetic disks.

However, in the present technology, the thin stainless steel plate 1 constituting the suspension body is about 0.07.
mm, the covered electric wire is about 0.05 mm, but the outer diameter of the tube 23 can be reduced to only about 0.4 mm. Therefore, as long as the coated electric wire covered with such an insulating tube is used as a signal line, there is a problem that the thickness of the tube becomes a neck and the suspension cannot be thinned.

Further, when writing or reading is performed, the gap between the magnetic disk D and the magnetic head 3 (usually,
0.01 to 0.05 μm) is maintained by the balance between the buoyant force acting on the magnetic head from the disk surface (mirror surface) generated by the rotation of the magnetic disk and the spring force of the suspension trying to press the magnetic head against the magnetic disk. However, when the suspension also supports the covered electric wire 20, not only the spring force of the suspension body but also the elastic force of the tube covering the covered electric wire acts on the suspension, and as a result, the mechanical characteristics (flying characteristics) of the magnetic head,
Specifically, there is a problem in that the flying height, pitch, roll characteristics, etc. are reduced.

Particularly, when the conventional tube 23 is made of a material having a relatively high rigidity such as PTFE (polytetrafluoroethylene), the tube 23
In the case where the route for handling is complicated, it has a great influence on the spring force of the suspension, and it was extremely difficult to adjust the levitation characteristics in consideration of this.

Moreover, since the covered electric wire is fixed to the suspension indirectly by fixing the tube to the suspension, if the tension is applied only to the covered electric wire after the tube is fixed to the suspension, the covered electric wire and the tube are fixed. It was not uncommon for slippage to occur between the two and the resulting change in the levitation characteristics once adjusted.

Therefore, although the present inventors certainly contribute to the reliability of the insulation property such as noise countermeasures, the reliability obtained by the tube is excessive quality, and even if the tube is abolished, the insulation tube is covered. As long as the thin film insulation film formed on the wire is not destroyed, it is confirmed that the insulation property is sufficient, and then it is possible to prevent damage to the thin film insulation film of the covered wire and realize a miniaturized suspension. The present invention has been completed as a result of studying the optimum routing. As described above, the present invention aims to reduce the thickness of the suspension, stabilize the buoyancy characteristic, and reduce the cost.

[0011]

In order to achieve the above object, in a magnetic disk suspension of the present invention, a magnetic head is attached to one end of a suspension body made of a thin plate so as to move toward and away from the magnetic disk. In the magnetic disk suspension provided in, the signal line led out from the magnetic head is fixed to the suspension body substantially parallel to the surface of the suspension body.

At this time, it is desirable that the shape of the signal line from the magnetic head to the fixed position on the suspension body is loop-shaped.

The signal line is preferably fixed to the suspension body with an adhesive.

In order to achieve the above object, in the method of manufacturing a suspension for a magnetic disk according to the present invention, a suspension body having a magnetic head fixed to one end is positioned, and then a signal line led out from the magnetic head is placed at a predetermined position. It is characterized in that it is fixed to the suspension body while being wound around the arranged guide pin.

At this time, the signal line is preferably fixed to the suspension body with an adhesive.

[0016]

The magnetic disk suspension of the present invention is characterized in that the signal line derived from the magnetic head is fixed to the suspension body substantially parallel to the surface of the suspension body, and the suspension having the magnetic head fixed to one end thereof. It is obtained by positioning the main body and then fixing it to the suspension main body while winding the signal line extending from the magnetic head along the guide pin arranged at a predetermined position.

An adhesive is preferably used to fix the signal line to the suspension, and the signal line from the magnetic head to the fixing position on the suspension body is preferably loop-shaped.

Since the signal line derived from the magnetic head is fixed substantially parallel to the surface of the suspension body,
The overall suspension can be made thinner. In addition, the signal line covered with a thin insulating film does not affect the rigidity of the suspension at all, and the signal line from the magnetic head to the fixed position on the suspension body is formed in a loop shape. This loop portion alleviates and absorbs adverse effects on the levitation characteristics of the main body, thus stabilizing the buoyancy characteristics of the suspension.
In addition, according to the fixing method using an adhesive, there is no possibility of damaging the insulating film during assembly unlike the conventional signal line.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing a suspension for a magnetic disk (hard disk) according to an embodiment of the present invention, and FIG. 1B is a side view of the same.

As shown in FIG. 1, the hard disk suspension of this embodiment has a suspension body 1 made of, for example, a stainless steel thin plate, and a boss hole 2 is formed at one end thereof. The boss hole 2 is a hole for mounting two suspensions on an arm (not shown) by superimposing the two suspensions back to back. Since information is written on the front and back of the hard disk D, two suspensions are inserted between the disks D and D, and by the magnetic head 3 attached to the tip of these suspensions,
Information is written in and read from each disc D.

The shape of the suspension body 1 is shown in FIG.
The boss hole 2 is not limited to the embodiment shown in FIG.
Between the magnetic head 3 and the tip of the main body to which the magnetic head 3 is attached,
Due to the buoyancy acting on the magnetic head 3, the magnetic head 3 is bent at an angle α so as to have a predetermined rigidity. And
When the disk D is stationary, the magnetic head 3 contacts the disk D as shown by the solid line in FIG. 1B due to the rigidity of the suspension body 1. However, when the disk D rotates, the magnetic head 3 and the disk A buoyant force that lifts the magnetic head is generated between the magnetic head 3 and the surface (which is processed into a mirror surface state), and the magnetic head 3 stands still at a position where the buoyant force and the rigidity of the suspension body 1 are balanced.
Normally, the magnetic head 3 and the disk D in the balanced position
The gap with the surface is 0.01 to 0.05 μm.

At the tip of the suspension body 1, a universal joint 4 is formed by locally thinning a thin plate constituting the main body, and the magnetic head 3 is attached to the universal joint 4 (FIG. 1). It is attached to the back surface in the plan view shown in (a)). The universal joint portion 4 allows the magnetic head 1 to swing with respect to the suspension body 1.

The magnetic signal detected by the magnetic head 3 is output to a signal processing device (not shown) of the hard disk using the pad surface of the magnetic head 3 as a terminal. In the suspension of this embodiment, the magnetic head 3 is used. The wiring of the covered electric wire (signal wire) 5 for connecting the pad surface of No. 1 and the signal processing device of the hard disk is taken into consideration.

That is, as shown in FIG. 1 (a), since the suspension body 1 is a conductor in this embodiment, a thin insulating film is formed on a wire of, for example, about 0.05 mmφ to form the covered wire 5. This covered electric wire 5 is formed into a loop shape as shown in FIG. 1A and used as it is as a signal wire.

In this way, in forming the loop shape, it is desirable that the angle β shown in FIG. 1A be 0 to 45 °. If the angle β is 0 ° or less, the pad surface of the magnetic head 3 is significantly bent, which is not preferable in terms of disconnection. On the other hand, if it is larger than 45 °, the contact between the covered electric wire 5 and the gutter-shaped flange 6 described later becomes unstable, and the positioning accuracy of the covered electric wire 5 in the adhesive applying step is lowered, which is not preferable. However, since the range of the angle β is slightly different depending on the shape and structure of the suspension body 1, it is essential that the covered electric wire 5 is not bent more than necessary, and the positional accuracy in the adhesive applying step can be secured. Good.

Further, in the past, if the covered electric wire is used as it is without using the insulating tube, the insulating film may be destroyed depending on the fixing method with the suspension body. However, in this embodiment, the fixing means to the suspension body is fixed. This problem is solved by using as an adhesive. That is, gutter-shaped flanges 6 and 6 for crawling the covered electric wire 5 are formed on the side edges of the suspension body 1, and the covered electric wire 5 led out from the pad surface of the magnetic head 3 is shaped into a loop. Then, it is drawn along the gutter-shaped flanges 6 and 6. Then, the trough-shaped flange 6 is fixed with an adhesive at both end portions 6a and 6b. As the adhesive, various adhesives such as an ultraviolet curable resin adhesive or a thermosetting resin adhesive can be used, and it is desirable to use the ultraviolet curable resin adhesive when quick drying is important.

Incidentally, the embodiment shown in FIG. 1 (a) shows an example in which two covered electric wires 5 and 5 are provided between the magnetic head 3 and the signal processing device, and the applied magnetic head is used. Although the number of coated electric wires varies depending on the specifications of the hard disk system and the hard disk system 3, the present invention can be applied regardless of the number of coated electric wires.

Next, a method of manufacturing the suspension having the above structure will be described. 2 to 4 are plan views showing a method of manufacturing the magnetic disk suspension of the embodiment.

First, a thin plate blank made of stainless steel is subjected to an etching treatment to be separated into individual suspension bodies 1. This etching treatment can be performed by punching with a so-called powder beam or a press, or by using a chemical. When the individual suspension bodies 1 are obtained, next, a gutter-shaped flange 5 is formed on the side edge, the suspension body 1 is slightly bent by an angle α, and a base plate 7 is welded to the lower surface of the boss hole 2. Further, the universal joint portion 4 to which the magnetic head 3 is attached is formed by etching.

On the other hand, with respect to the magnetic head 3, one end of the covered electric wire 5 is connected to the pad surface of the magnetic head 3 by, for example, ultrasonic bonding, and the magnetic head 3 to which the covered electric wire 5 is connected is formed at the tip of the suspension body 1. It is fixed to the universal joint portion 4 by using, for example, an epoxy adhesive.

Next, the suspension body 1 to which the magnetic head 3 is fixed is carried in and positioned in the apparatus for routing the covered electric wire. The positioning of the suspension body 1 can be performed, for example, by forming a positioning hole in the suspension body 1 and inserting a pin of a hauling device into the hole. In this embodiment, as shown in FIG. 2, the positioning pin 8 and the fixing screw (not shown) of the routing device are inserted into the positioning hole 8 and the boss hole 2 formed in the suspension body 1. .

When the sub-assembly of the suspension body 1 is positioned on the routing device, the relative position between the guide pin 10 provided on the routing device and the suspension body 1 is accurately measured. After gripping the wire, the covered electric wires 5 and 5 are drawn around the guide pins 10 and 10 as shown in FIG. 3, and the ends thereof are drawn along the gutter flanges 6 and 6, The free end of the covered electric wire 5 is chucked while applying tension (the chucking portion is indicated by "11" in FIG. 3).

Since the covered electric wire 5 itself has a certain degree of regularity, it can be formed into a loop shape as shown in FIG. 1 by being drawn by the guide pin 10. Further, in the case of the present embodiment, the angle β is 0 to 45.
By setting the angle to °, the covered electric wire 5 is positioned along the predetermined position of the gutter-shaped flange 6.

While maintaining the chucking 11,
As shown in FIG. 4, the covered electric wire 5 and the suspension body 1 are fixed with an adhesive. Since the adhesive used in this example is an ultraviolet curable adhesive and has a quick-drying property, the time required for curing is 20 to 30 seconds, and improvement in productivity can be expected. The application site of the adhesive is not particularly limited, but it is desirable to apply it to at least both ends 6a and 6b of the gutter-shaped flange 6.

Finally, the suspension body 1 to which the covered electric wire 5 is fixed is taken out from the drawing device, and the two suspensions 1 and 1 thus manufactured are fixed back-to-back with the boss holes 2 and the arm of the hard disk drive. Attach to. At this time, the free end of the covered electric wire 5 fixed to the suspension is connected to a terminal (not shown) formed on the arm.

It should be noted that the embodiments described above are described for facilitating the understanding of the present invention, and not for limiting the present invention. Therefore, each element disclosed in the above-described embodiments is intended to include all design changes and equivalents within the technical scope of the present invention.

For example, the loop shape of the covered electric wire from the magnetic head 3 to the fixed portion to the suspension body 1 is shown in FIG.
The embodiment shown in FIG. 5 is not limited to the embodiment shown in FIG. Such a choice is the
It suffices to consider the loop shape that is most efficient in terms of static characteristics and productivity.

[0038]

As described above, in the magnetic disk suspension of the present invention, the signal line derived from the magnetic head is fixed to the suspension body substantially parallel to the surface of the suspension body, so that the overall thickness of the suspension can be reduced. Can be planned. In addition, the signal line covered with a thin insulating film does not affect the rigidity of the suspension at all, and the signal line from the magnetic head to the fixed position on the suspension body is formed in a loop shape. This loop portion alleviates and absorbs adverse effects on the levitation characteristics of the main body, thus stabilizing the buoyancy characteristics of the suspension. In addition, according to the fixing method using an adhesive, there is no possibility of damaging the insulating film during assembly unlike the conventional signal line.

[Brief description of drawings]

FIG. 1A is a plan view showing a suspension for a magnetic disk according to an embodiment of the present invention, and FIG. 1B is a side view of the same.

FIG. 2 is a plan view showing the method of manufacturing the magnetic disk suspension of the embodiment.

FIG. 3 is a plan view showing the method of manufacturing the suspension, which is subsequent to FIG.

FIG. 4 is a plan view showing the method of manufacturing the suspension, which is subsequent to FIG.

FIG. 5 is a plan view of relevant parts showing a suspension for a magnetic disk according to another embodiment of the present invention.

6A is a plan view showing a conventional magnetic disk suspension, and FIG. 6B is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Suspension body 2 ... Boss hole 3 ... Magnetic head 5 ... Coated electric wire (signal wire) 6 ... Gutter-shaped flanges 6a, 6b ... Fixing portion of covered electric wire with adhesive 8 ... Positioning hole 9 ... Positioning pin 10 ... Guide pin 11 ... Chucking part D ... Magnetic disk

Claims (5)

[Claims] 1. A suspension for a magnetic disk in which a magnetic head is attached to one end of a suspension body made of a thin plate and is arranged so as to move toward and away from the magnetic disk, and a signal line derived from the magnetic head is provided in the suspension. A suspension for a magnetic disk, which is fixed to the suspension body substantially parallel to a surface of the body. 2. The suspension for a magnetic disk according to claim 1, wherein the signal line from the magnetic head to the fixed position on the suspension body has a loop shape. 3. The magnetic disk suspension according to claim 1, wherein the signal line is fixed to the suspension body with an adhesive. 4. A suspension main body having a magnetic head fixed to one end is positioned and then fixed to the suspension main body while winding a signal line derived from the magnetic head along a guide pin arranged at a predetermined position. A method for manufacturing a magnetic disk suspension characterized by the above. 5. The method of manufacturing a magnetic disk suspension according to claim 4, wherein the signal line is fixed to the suspension body with an adhesive.