JPH0660346A - Slider of floating type magnetic head and fixing method of flexure - Google Patents

Abstract

PURPOSE:To improve accuracy by expediting the utilization of adhering jigs, decreasing the number of the adhering jigs and lessening the variation in the mounting size of a slider and a flexure. CONSTITUTION:A thermosetting adhesive 10 and a UV adhesive 11 are simultaneously selectively used for the slider 1 of the floating type magnetic head and an adhesive for fixing the flexure 2. The adhering jig 7 is used for the UV adhesive 11 and the adhesive is cured with UV rays by a UV irradiation device 15. The adhering jig 7 is thereafter removed. The thermosetting adhesive 10 is fixed by heating and curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a slider and a flexure of a floating magnetic head used for recording and reproducing data in a hard disk device.

[0002]

2. Description of the Related Art Hard disk devices have been decreasing in size year by year, such as 14 inches, 8 inches, 5.25 inches, 3.5 inches and 2.5 inches, and the storage capacity has been increasing. Demand is increasing year by year, and the market cost tends to be low. It is progressing.

Along with the miniaturization of hard disk devices, floating magnetic heads for reading and writing data from and to magnetic disks have undergone major changes. The so-called magnetic head is also becoming smaller and thinner in accordance with the above, and the slider and the suspension including the flexure including the slider, the load beam, and the mount block are changing year by year.

FIG. 1 is a perspective view of a standard assembly of a floating magnetic head to which the present invention is applied. A suspension 5 has a flexure 2 for mounting a slider 1 and a load for applying a head load. It is composed of a beam 3 and a mount block 4 for mounting on a hard disk device. Further, the load beam 3 is formed with a plurality of claws 6 for fixing the tube 12 passing through the lead wire 13 at a plurality of positions (for example, 8 positions). The suspension 5 is made of non-magnetic stainless steel (hereinafter referred to as SUS), and the slider 1 and the flexure 2 are fixed mainly by using a thermosetting adhesive 10. As shown in FIG. And the slider fixing pin 14 is used to fix the slider in place.

The thermosetting adhesive 10 has a one-component type and a two-component type. These are a one-component type in which a main agent and a curing agent are mixed from the time of delivery, and they are The two-part type is a mixture of curing agents.

As described above, since the one-component type has the main component and the curing agent already mixed, there is no fear of a mistake in the mixing ratio of the resin and a stirring error by the operator, but the curing proceeds even at room temperature. Therefore, low temperature storage is required.

Next, in the case of the two-component type, although resin mixing and stirring work are required, there are some that can store the main agent and the curing agent at room temperature. These are the basic problems of thermosetting adhesive 10 and are used by floating magnetic head manufacturers in recognition.

[0008]

The slider and the flexure of the floating magnetic head are fixed at a predetermined position by using an adhesive with an adhesive so that the so-called thermosetting adhesive is hardened. It must be set in the jig.

The relationship between the curing temperature and the time of the thermosetting adhesive is wide and inversely proportional. Adverse effects on the slider due to adhesion (deformation of the slider due to expansion and contraction of the adhesive)
Also, considering workability, the temperature is 80 ℃ ~ 120 ℃,
The current time is 30 to 60 minutes. If the slider 1 and the flexure 2 are fixed under the above conditions, a certain number of jigs are required. Also, the adhesive jig
Since it is heated at 80 ℃ to 120 ℃, the material, function, and accuracy of the jig are required only for that. For example, what is predicted by the fixing position accuracy of the slider and the flexure is that the fixing of the slider and the flexure deviates from the predetermined position due to expansion of the bonding jig due to heating. In addition, since the number of bonding jigs is large, it is natural that the variation is large.

Therefore, in order to reduce the number of jigs without heating the adhesive jig, the adhesive is changed and the adhesive is fixed at room temperature for a short time to fix the slider and the flexure.

As the adhesive, a cyanoacrylate-based adhesive (instantaneous adhesive) is a candidate. It cures rapidly due to moisture in the air or on the surface of the adherend, and the adhesive curing time is very fast and instantaneous. Therefore, the work efficiency is high, and the number of bonding jigs is small, which enables production support. However, the first drawback is inferior impact resistance. The miniaturization of personal computers these days makes it very convenient to carry,
The hard disk drive installed only for that purpose must endure a harsh environment.

Second, the periphery of the adhered object becomes white (whitening phenomenon). As this progresses, there is a strong possibility that it will become a powder and scatter. If this phenomenon occurs in the hard disk drive, the magnetic disk will reach 0.1 μm
It is also expected that the powdery substance may enter between the slider and the slider that floats with a gap of 0.2 μm, causing a disk crash and disabling data recording / reproducing to / from the hard disk device.

Due to the above-mentioned drawbacks, cyanoacrylate adhesives of the type having significantly improved impact resistance and whitening have been recently developed, but their use in hard disk devices is still a concern from the viewpoint of reliability. Is the reality.

Next, there is a method of fixing the slider and the flexure with a UV adhesive. As described above, although there are manufacturers of floating type magnetic heads that are actually used, as described above, the usage ratio is low due to the following drawbacks.

The UV adhesive is an ultraviolet curable resin, which cures the adhesive in a short time by irradiating it with ultraviolet rays.

In addition, since the recent UV adhesives have UV-cured and anaerobic-cured substances, the UV-ray adhesive cannot be irradiated with UV rays. The protruding surface can be ultraviolet-cured and anaerobically cured by blocking the air from the surface portion.

However, the problem that the characteristics of this UV adhesive cannot be fully utilized will be described with reference to FIG. FIG. 5 is an enlarged perspective view of a portion where the flexure and the slider of FIG. 1 are fixed. At the flexure 2 part to which the slider 1 is fixed, the surface of the UV adhesive 11 protruding from the flexure 2 is shaded behind the load beam 3 and it becomes difficult to cure the surface of the UV adhesive 11 with ultraviolet rays. It becomes uncured and sufficient adhesive strength cannot be obtained.

Therefore, the present invention aims to solve the problems of the prior art as described above, and to improve the work efficiency and accuracy of bonding the slider and the flexure of the floating magnetic head.

[0019]

According to the fixing method of the present invention, a thermosetting adhesive can be applied to a portion of the flexure portion where the slider is fixed, which is behind the load beam and where it is difficult to irradiate the ultraviolet ray, with the ultraviolet ray irradiation. UV adhesives are selectively used at the same time to fix the slider and flexure under the respective curing conditions of both adhesives.

[0020]

According to the present invention, since the UV adhesive is set on the bonding jig only when it is cured by ultraviolet rays, and when the thermosetting adhesive is cured, it is removed from the bonding jig and only the floating magnetic head is heated. Is faster and the number of bonding jigs can be reduced, which improves bonding work efficiency and
Variations in the mounting dimensions of the slider and flexure are reduced, improving accuracy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a thermosetting adhesive 10 is used in a place where the ultraviolet ray irradiation is difficult due to the shadow of the load beam 3 in the flexure 2 portion to which the slider 1 is fixed, and the ultraviolet ray irradiating portion is exposed to the UV light. UV adhesive 11 using adhesive 11
Then, the slider 1 and the flexure 2 are fixed under the respective curing conditions. As a result, the number of jigs used can be reduced.

FIG. 2 is a perspective view of a flexure according to an embodiment of the present invention in which the adhesive has been applied. At the center of the flexure 2 portion, there is a dimple 9 (round dent) serving as a point of action for applying a load to the magnetic disk side. The thermosetting adhesive 10 and the UV adhesive 11 are separately applied with the dimple 9 as a boundary.

The thermosetting adhesive 10 is placed in the shade of the load beam 3 and is difficult to irradiate with ultraviolet rays, that is, the dimple 9
Apply from the edge to the mount block 4 side. UV adhesive
11 is applied from the edge of the dimple 9 to the tip side of the flexure 2.

By thus separately coating the thermosetting adhesive 10 and the UV adhesive 11 with the dimple 9 as a boundary, the adhesives are not mixed before the slider 1 and the flexure 2 are brought into close contact with each other. However, if the viscosity of the adhesive is too low, it cannot be said that it will not mix, so the minimum viscosity is 40
00 centipoise or more is suitable. By making a hole in the middle of applying the UV adhesive 11, the ultraviolet rays are irradiated not only to the periphery of the flexure 2 but also to the center thereof, and the UV adhesive 11 is surely cured.

Next, the bonding method (curing method) will be described with reference to FIGS. FIG. 3 is a plan view in which the slider 1 is set on the bonding jig 7. Figure 4 shows slider 1 and flexure 2
FIG. 3 is a side view showing a state in which is set on the bonding jig 7 and is irradiated with ultraviolet rays.

A thermosetting adhesive 10 and UV are applied to the flexure 2.
Slider 1, flexure 2, coated with adhesive 11
The suspension 5 composed of the load beam and the mount block 4 is set on the bonding jig 7 of FIG. 3, placed on the slider 1, and the slider 5 is fixed on the bonding jig 7 by the slider fixing pin 14.

First, the surface of the UV adhesive 11 protruding from the flexure 2 is cured. Ultraviolet rays effective for curing the UV adhesive 11 (wavelength is 300 to 400 nm) are emitted from the ultraviolet ray irradiation device 15, and the surface of the UV adhesive agent 11 is cured by ultraviolet rays to block air from the surface portion, so that ultraviolet rays cannot be emitted. It is possible to anaerobically cure the sliding portion (the portion in which the metal ions are present) by the irradiation heat from the ultraviolet irradiation device 15, and it can be smoothly cured in a relatively short time. The time to radiate this ultraviolet ray depends on the characteristics of the UV adhesive 11 used and the illuminance of the ultraviolet ray radiated from the ultraviolet ray irradiating device 15, but normally it is cured by the integrated amount of ultraviolet ray of 3000 mj / cm ² or more, and thus the ultraviolet ray is irradiated. When the illuminance is about 200 mw / cm ² , the UV irradiation time is 20 to 30 seconds. With this, since the slider 1 and the flexure 2 are temporarily fixed at a predetermined position unless a strong impact is applied, the bonding jig 7 moves the floating magnetic head.
(Slider 1) can be removed.

Then, by heating only the floating magnetic head detached from the bonding jig 7, the thermosetting adhesive 10 is hardened this time to cure the slider 1 and the flexure 2.
Is to be fixed completely. Also, thermosetting adhesive
When heating is performed for the purpose of hardening 10, the adhesive strength of the fixing portion with the UV adhesive 11 can be improved at the same time as compared with the case of ultraviolet hardening.

As described above, the UV adhesive 11 is set on the bonding jig 7 only when it is cured by ultraviolet rays, and when the thermosetting adhesive 10 is cured, it is removed from the bonding jig 7 and only the floating magnetic head is heated. Slider 1 and flexure 2
Since the fixing jigs are completely fixed, the use of the bonding jigs 7 becomes faster, and the number of the bonding jigs 7 can be reduced, so that the bonding work efficiency is improved and the variation in the mounting dimensions of the slider 1 and the flexure 2 is small. Accuracy is improved.

As another example, after the UV curing of the UV adhesive 11 using the room temperature curable adhesive instead of the thermosetting adhesive 10, the floating magnetic head is removed from the bonding jig 7 to cure at room temperature. There is also a method in which the adhesive is cured during the subsequent process.

[0032]

As described above, the method of fixing the slider and the flexure of the floating magnetic head of the present invention is U.
Since the V-adhesive is used only when the adhesive is cured by ultraviolet rays, and when the thermosetting adhesive is cured, the adhesive is removed from the adhesive and only the floating magnetic head is heated. Since the number of units can be reduced, the bonding work efficiency is improved, and the variation in the mounting dimensions of the slider and the flexure is reduced, and the accuracy is improved.

When the slider and the flexure are fixed only by the conventional thermosetting adhesive, many adhesive jigs are required because they have to be set in the adhesive jig until the thermosetting adhesive is cured. However, according to the present invention, since the number of bonding jigs can be reduced, the investment cost for the jigs can be reduced without changing the productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of a standard assembly of a floating magnetic head that is the subject of the present invention.

FIG. 2 is a perspective view of the flexure according to an embodiment of the present invention in which an adhesive has been applied.

FIG. 3 is a plan view when a slider is set on an adhesive jig.

FIG. 4 is a side view showing a state in which a slider and a flexure are set on a bonding jig and ultraviolet irradiation is performed.

5 is an enlarged perspective view of a portion where the flexure and the slider of FIG. 1 are fixed.

[Explanation of symbols]

1 ... slider, 2 ... flexure, 3 ... load beam, 4 ... mount block, 5 ... suspension, 6 ... claw, 7 ... adhesive jig, 9 ... dimple,
10 ... Thermosetting adhesive, 11 ... UV adhesive, 12 ... Tube, 13 ... Lead wire, 14 ... Slider fixing pin,
15 ... UV irradiation device.

Claims (1)

[Claims] 1. A flexure portion to which a slider of a floating magnetic head is fixed, a thermosetting adhesive is applied to a portion where it is difficult to irradiate ultraviolet rays due to a shadow of a load beam, and a UV adhesive is applied to a portion capable of ultraviolet irradiation. The method of fixing the slider and the flexure of the floating magnetic head is characterized by fixing the slider and the flexure under different curing conditions for both adhesives by separately using the above.