JPH11149618A - Method of manufacturing composite magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite magnetic head having good environmental reliability by fixing a pair of magnetic heads in a state where they are accurately and easily aligned, and to improve the production yield. SOLUTION: A side surface 1a of a recording head 1 and a reproducing head 2
Side 1b of the recording head 1
And at least one of the side face 3b of the read head 3, at least one of the side face 2a of the read head 2 and the side face 4a of the erase head 4, and at least one of the side face 3a of the read head 3 and the side face 5a of the outrigger 5, It has curability and a viscosity at 25 (° C.) of 250 to 1500 (c
p) is applied to the resin, these members are opposed to each other via the resin, are aligned, and are temporarily cured by irradiating the resin with ultraviolet rays, and the members are temporarily fixed, and the resin is heated. To cure and bond and fix each member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite magnetic head in which a pair of magnetic heads are bonded and fixed via a resin. More specifically, a composite that allows the production of a composite magnetic head with good environmental reliability and improves the production yield by adhering and fixing the pair of magnetic heads accurately and easily while regulating the viscosity of the resin. The present invention relates to a method for manufacturing a magnetic head.

[0002]

2. Description of the Related Art Conventionally, in computers and the like,
A hard disk or the like is mounted as a storage device for backing up various information signals, and a data cartridge has been used to further increase the storage capacity. This data cartridge has a tape-shaped magnetic recording medium disposed therein, and performs recording and reproducing of a magnetic recording signal on the medium to back up various information signals.

The data cartridge containing the tape-shaped magnetic recording medium employs a so-called read-after-write system. Usually, a magnetic head for recording and a magnetic head for reproduction are arranged in the tape running direction. Recording and reproduction are performed by the combined magnetic head.

In this composite magnetic head, immediately after the recording magnetic head records the magnetic signal on the tape-shaped magnetic recording medium, the reproducing magnetic head reproduces the recorded magnetic signal.

Furthermore, in recent years, the capacity of data cartridges has tended to increase as the capacity of hard disks has increased. For this reason, as a magnetic recording conversion element, a magneto-resistance effect type magnetic head (hereinafter, referred to as an MR head) using a magneto-resistance effect element suitable for high-density recording or a thin-film head using an amorphous metal is used. Composite magnetic heads have been used.

[0006] The composite type head as described above is manufactured as follows. That is, first, as shown in FIG. 8, for example, a magnetic head for recording (hereinafter simply referred to as a recording head) 101, a pair of magnetic heads for reading (hereinafter simply referred to as a reproducing head) 102 and 103, and erasing. Magnetic head (hereinafter simply referred to as erase head) 1
04 and an outrigger 105 for improving the running stability of the magnetic recording medium.

A pair of reproducing heads 10 are provided on both sides of the recording head 101 in a direction perpendicular to the track width direction.
2 and 103 are sandwiched therebetween. Further, an erasing head 104 is arranged on the opposite side of the one reproducing head 103 from the side facing the recording head 101, and the other reproducing head 1
The outrigger 105 is disposed on the side opposite to the side facing the recording head 101 of No. 02.

At this time, the magnetic gap of each magnetic head is aligned in the track width direction and the height direction orthogonal thereto in consideration of the information recording / reproducing characteristics, and the contact with the magnetic recording medium is considered. It is necessary to adjust the position of each member facing the magnetic recording medium.

For this reason, in the step of disposing each member at a predetermined position as described above, as shown schematically in FIG. 9, the reproducing head 103 is connected to a pair of jigs in the track width direction. 106,107 pinching pressurized as in the arrow p ₁ by, and which was to perform the positioning by moving in a state where the respective members were floated in the air horizontally and vertically.

As shown in FIG. 10, a pair of reproducing heads 102 and 103 are arranged on both sides of the recording head 101 so as to be sandwiched therebetween. The head 104 is arranged, and the outriggers 105 are arranged on the other reproduction head 102 on the side opposite to the side facing the recording head 101 and aligned. Outer side surface 105a is vertical surface 108a
Place it on its side.

Next, as shown in FIG.
05 from the erase head 104 side opposite to
09 by as indicated by arrow p ₂ against these members in a vertical plane 108a is brought into close contact between the respective members. Subsequently, as shown in FIG. 10, from the side of the magnetic recording medium facing surface X side of these members, a so-called instant adhesive 111 which reacts with the moisture in the outside air from the adhesive supply means 110 and cures is applied to the interface between the members. , And is allowed to permeate into the interface, and is left for a predetermined period of time. As the instant adhesive, an industrial adhesive having low viscosity and high permeability is used.

In this process, the instant adhesive is used because such a composite type magnetic head has an MR head as described above.
This is because a head or a thin film head is used, and it is difficult to perform a heat treatment at 150 (° C.) or more in order to prevent deterioration of the MR head, crystallization of the amorphous phase, and diffusion of the thin film component.

Next, the block in which the respective members are bonded and fixed is bonded and fixed on a pedestal called a housing, and finally, the block is bonded and fixed on the actuator to complete the process.

[0014]

By the way, in the above-mentioned method for manufacturing a composite magnetic head, when a block in which each member is bonded and fixed to a housing or an actuator is misaligned, a relative displacement occurs. Although it can be easily corrected, if it is adhered and fixed with an instant adhesive as it is in a state where misalignment has occurred at the time of alignment between the members, the correction is very difficult and causes a decrease in manufacturing yield.

Further, in a data cartridge in which the above-mentioned composite type head is used, higher recording density is progressing with higher recording capacity, and high environmental reliability is required.
For example, when left in an environment of a temperature of 40 (° C.) and a relative humidity of 93 (%), it is required that the fluctuation rate of the dynamic characteristics such as the reproduction output from the initial value be kept within 15 (%). ing. However, in the composite type magnetic head in which the members are bonded and fixed with the instant adhesive as described above, the environment resistance of the bonding portion is low, and when the members are left in the high-temperature, high-humidity environment as described above, the members become As a result, the positioning accuracy of each member is reduced, and the dynamic characteristics of the composite magnetic head are reduced, resulting in insufficient environmental reliability.

The low environmental resistance of the bonded portion made of the instant adhesive is considered to be due to the following factors.

The first factor is as follows. As described above, when the members are bonded and fixed, an instant adhesive is supplied to the interface between the members in a state where the members are aligned, and the members are bonded to each other. However, the opposing surfaces of the members are mirror surfaces in order to enhance the alignment accuracy, and the members are in close contact with each other, and it is difficult for the instant adhesive to penetrate into the interface between these members.
In addition, the wettability to the instant adhesive varies depending on the material of the member, and this also prevents penetration into the interface. Therefore, the adhesive does not sufficiently penetrate into the interface between the members, and the environment resistance of the bonded portion is reduced.

To cope with this, while measures are taken such that the opposing surface of each member is a surface having an appropriate roughness, a groove is provided in the opposing surface, and a primer is used together, but sufficient effects are obtained. Not obtained.

Next, the second factor is as follows. As described above, the instant adhesive reacts with moisture in the outside air and cures, and even if the instant adhesive sufficiently permeates the interface of each member, only the surface in contact with the outside air cures. As a result, the interior that does not come into contact with the outside air hardly hardens, and the environment resistance of the bonded portion is reduced.

The third factor is as follows. The instant adhesive has low moisture resistance regardless of the type. For this reason, when the instant adhesive is allowed to penetrate into the interface of each member, although the exposed portion to the outside air is small, the strength also decreases due to humidity, and the strength is sufficient for use in data cartridges. It cannot be said that it can be done, and the environmental resistance of the bonded portion is lowered.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and has a pair of magnetic heads bonded and fixed in a state where they are accurately and easily aligned, thereby providing a composite magnetic head having good environmental reliability. An object of the present invention is to provide a method of manufacturing a composite magnetic head that enables manufacture of a head and improves manufacturing yield.

[0022]

As described above, it is very difficult to fill the interface between the members with the adhesive and supply the adhesive, and supply a sufficient adhesive to the interface between the members. Therefore, it is necessary to consider other supply methods.
In this case, the positioning accuracy of each member is 1 (μm) or less without hindering the positioning of each member.
It is necessary to guarantee the angle in the range of 1 (min) or less. Since the length in the track width direction of this type of composite type magnetic head is about 14 (mm), it is understood that it is necessary to guarantee a very high accuracy of positioning.

On the other hand, a method is considered in which a resin serving as an adhesive is applied to the opposing surface of each member, and the members are adhered to each other. In this case, a normal organic adhesive may be used as the resin to be the adhesive, and the organic adhesive is preferably used because it has better environmental resistance than the instant adhesive.

As the organic adhesive, a thermosetting adhesive may be used. However, in order to prevent the deterioration of the MR head, the crystallization of the amorphous phase, and the diffusion of the thin film component, the organic adhesive is used.
Those requiring heat treatment of (° C.) or more are difficult to use. On the other hand, as the organic adhesive, an ultraviolet-curable adhesive may also be used. However, since the organic adhesive is interposed at the interface between the members and the interior is not irradiated with ultraviolet light, an ultraviolet-curable adhesive is used. It is difficult to completely bond and fix the members.

Furthermore, if the viscosity of the adhesive is too low, the members will be attracted to each other, making it difficult or impossible to position them. On the other hand, if the viscosity of the adhesive is too high, the thickness of the adhesive layer is increased, and the exposed portion to the outside air is increased, so that not only the weather resistance is easily reduced, but also the viscous resistance of the adhesive itself causes the resistance of each member. Positioning becomes difficult.

Therefore, in the method of manufacturing a composite magnetic head according to the present invention, at least one of the pair of magnetic heads has an ultraviolet curable property and a thermosetting property on the facing surface of the magnetic head at 25 ° C. Viscosity 250-1500
(Cp) a step of applying a resin, a step of positioning the pair of magnetic heads so as to face each other via a resin, and irradiating the resin with ultraviolet rays to temporarily cure the resin, thereby causing a gap between the pair of magnetic heads. The method includes a step of temporarily fixing and a step of heating and curing the resin and bonding and fixing the pair of magnetic heads.

The resin referred to here is used to bond between a pair of magnetic heads, and is mainly composed of resin.
It shows a general adhesive containing a solvent and the like in addition to the resin.

In the method of manufacturing a composite magnetic head according to the present invention, in the step of positioning the pair of magnetic heads so as to face each other via a resin, the resin is protruded from an opposing surface. It is preferable to irradiate the protruding resin with ultraviolet rays to temporarily cure the resin and temporarily fix the pair of magnetic heads.

In the method of manufacturing a composite magnetic head according to the present invention, the pair of magnetic heads may be a recording magnetic head and a reading magnetic head.

In the method of manufacturing a composite magnetic head according to the present invention, at least one of the pair of magnetic heads has ultraviolet curability and thermosetting on the opposing surface thereof.
After applying a resin having a viscosity of 250 to 1500 (cp) at (° C.), the pair of magnetic heads are opposed to each other via the resin and aligned. Sufficiently supplied, the environment resistance of the bonded part is improved.

Further, since the viscosity of the resin is set in the above range, the magnetic heads are attracted to each other to make it difficult or impossible to align them. The viscosity resistance of the resin itself makes it difficult to align the magnetic heads. The positioning between the magnetic heads is performed accurately and easily without becoming impossible. Furthermore, since the viscosity of the resin is in the above range, the thickness of the bonded portion does not increase so much, and the exposed portion to the outside air is small, so that the environmental resistance of the bonded portion is improved.

Further, the resin is irradiated with ultraviolet rays to cure only the surface side to temporarily cure the resin, temporarily fix the space between the pair of magnetic heads, heat the resin to cure the resin, and bond the pair of magnetic heads together. Since the resin is fixed, even if the inside of the resin is not cured at the time of the temporary fixing, the inside is completely cured by heating in a later step, and the environmental resistance of the bonded portion is improved.

When the pair of magnetic heads is aligned, the resin is allowed to protrude from the opposing surface, and the protruded resin is irradiated with ultraviolet rays to be preliminarily cured to temporarily fix the pair of magnetic heads. The temporary fixing between the magnetic heads is more reliably performed.

Furthermore, when a normal organic adhesive is used as the resin, the environment resistance of the bonded portion is improved because the environment resistance is better than that of the instant adhesive.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. Here, a QIC (Quarter Inch Ca) which is frequently used for a data cartridge is used.
An example in which the present invention is applied to manufacture of a (tridge) head will be described.

The QIC head is a composite type magnetic head used in a fixed head type backup system using a magnetic tape of 1/4 (inch) width as a magnetic recording medium. The number of channels is four, and the storage capacity is four. Reaches, for example, 13 (Gb).

In this embodiment, first, as shown in FIG. 1, a recording head (hereinafter, referred to as a recording head) 1 for recording information on a magnetic tape and a pair for reproducing information on the magnetic tape. (Hereinafter, referred to as a reproducing head) 2, 3; an erasing head (hereinafter, referred to as an erasing head) 4 for erasing information on a magnetic tape; and an outrigger 5. Here, the illustration of the draw-out flexible printed wiring board which is connected to each member and serves as a connection means with the outside is omitted.

The recording head 1 has a plate-shaped recording head substrate 11 formed by exposing a recording head chip 12 having a magnetic gap or the like on one main surface 11a side;
The recording head guard 12 is formed of a plate-shaped recording head guard material 13 that protects the recording head chip 12 exposed to a.

Here, the recording head chip 12 is composed of, for example, a bulk type thin film magnetic head formed with a thin film.
It has a coil inside. The recording head chip 12 has the recording gaps for the above-mentioned four channels so as to be orthogonal to one main surface 11a and face the main surface 11b which is the upper surface. A coil (not shown) is provided inside the recording head chip 12.

The recording head substrate 11 and the recording head guard material 13 are disposed so as to face each other with one principal surface 11a, 13a facing each other, and are disposed so as to surround the recording head chip 12. In addition to providing the recording head chip 12 with mechanical strength, a contact area with the magnetic tape is ensured. At this time, the recording head substrate 11 and the recording head guard material 13 are opposed to one main surface 1
It goes without saying that 1a and 13a are substantially equivalent.
The principal surface 13b of the recording head substrate 11 which is orthogonal to the principal surface 11b of the recording head substrate 11 where the recording gap faces and one principal surface 13a of the recording head guard member 13 and is continuous with the principal surface 11b.
b is a surface that forms an arc gradually descending from one of the principal surfaces 11a and 13a.

That is, the recording head 1 is formed by bonding and integrating the recording head substrate 11 and the recording head guard material 13. Then, this recording head 1
In the above, when recording a magnetic signal on a magnetic tape, a desired current is supplied to this coil to generate a leakage magnetic field via a recording gap.

The reproducing head 2 has a plate-shaped reproducing head substrate 14 formed by exposing a reproducing head chip 15 having a reproducing gap or the like to the one main surface 14a side, and is exposed to the one main surface 14a. It is composed of a plate-shaped reproducing head guard material 16 for protecting the reproducing head chip 15.

Here, the reproducing head chip 15 is composed of, for example, a magneto-resistance effect type magnetic head having a magneto-resistance effect element. The reproducing head chip 15 has a reproducing gap corresponding to the recording gaps for four channels of the recording head chip 11 so as to be orthogonal to the one main surface 14a and face the main surface 14b which is the upper surface. In the reproducing head chip 15, when reproducing the magnetic signal of the magnetic tape, the magnetoresistive element serves as a magnetic sensing portion.

Further, the read head substrate 14 and the read head guard member 16 are disposed so as to be opposed to each other with one main surface 14a, 16a as an opposing surface, and are disposed so as to surround the read head chip 15. The reproducing head chip 15 is provided with mechanical strength and a contact area with the magnetic tape is secured. At this time, the reproducing head substrate 14 and the reproducing head guard material 16 are opposed to one main surface 1 as an opposing surface.
It goes without saying that 4a and 16a are substantially equivalent.

In the reproducing head guard member 16 and the reproducing head substrate 14, the main surface 16b, which is orthogonal to one main surface 16a, is a surface whose main surface 16b is an arc, and the main surface 14b is the reproducing head guard material 16 side. The surface of the head substrate 14 forms a circular arc that gradually descends toward the outer end side.

The reproducing head 3 also has the same configuration as the reproducing head 2 described above.
Is formed by a plate-shaped reproducing head substrate 17 formed by exposing to the one main surface 17a side, and a plate-shaped reproducing head guard member 19 for protecting the reproducing head chip 18 exposed by the one main surface 17a.

Here, the reproducing head chip 18 is composed of, for example, a magnetoresistive magnetic head having a magnetoresistive element, and the main surface 17a has a reproducing gap corresponding to the recording gap of four channels of the recording head chip 11. And orthogonal to the main surface 17b which is the upper surface. In the reproducing head chip 18, when reproducing a magnetic signal from a magnetic tape, the magnetoresistive element serves as a magnetic sensing portion.

The reproducing head substrate 17 and the reproducing head guard member 19 are disposed so as to face each other with one main surface 17a, 19a as an opposing surface, and are disposed so as to surround the reproducing head chip 18. The mechanical strength is given to the reproducing head chip 18 and the contact area with the magnetic tape is secured. At this time, the read head substrate 17 and the read head guard material 19 are opposed to one main surface 1 serving as an opposing surface.
It goes without saying that 7a and 19a are substantially equivalent.

In the reproducing head guard member 19 and the reproducing head substrate 17, the main surface 19b, which is orthogonal to the one main surface 19a, has an arc-shaped main surface 19b, and the main surface 17b has the reproducing surface from the reproducing head guard material 19 side. The surface of the head substrate 17 forms a circular arc that gradually descends toward the outer end side.

The erasing head 4 includes the recording head 1
And a magnetic gap wider than the recording gap and the reproducing gap for the four channels of the reproducing heads 2 and 3, and a coil is disposed therein. In the erasing head 4, when erasing a magnetic signal recorded on a magnetic tape, for example, a constant DC current is supplied to the coil, whereby the erasing head 4 generates a magnetic field from the coil,
A uniform leakage magnetic field is generated through the magnetic gap. The erasing head 4 erases the magnetic signal by applying the leakage magnetic field to the magnetic tape.

Further, the outriggers 5 are provided for the magnetic tape to run stably. The outrigger 5 makes the contact with the magnetic tape symmetric about the recording head, so that the magnetic tape runs stably.

Next, a pair of reproducing heads 2 and 3 are arranged so as to sandwich the recording head 1 in the thickness direction, and an erasing head 4 and an outrigger 5 are arranged so as to further sandwich them so as to be bonded and fixed.

At this time, in the present embodiment, in particular, these are fixed by bonding as follows. That is, first, at least one of the side surface 1a serving as the surface of the recording head 1 facing the reproducing head 2 and the side surface 2b serving as the surface facing the recording head 1 of the reproducing head 2 has UV curability and thermosetting property. Having a viscosity at 25 (° C.) of 250 to 1500
A resin (cp) is applied.

Similarly, at least one of the other side surface 1b of the recording head 1 facing the reproducing head 3 and the side surface 3b of the reproducing head 3 facing the recording head 1 has ultraviolet curability and thermosetting. A resin having properties and a viscosity at 25 (° C.) of 250 to 1500 (cp) is applied.

Further, the erasing head 4 of the reproducing head 2
At least one of the other side surface 2a serving as a surface facing the recording head and the side surface 4a serving as a surface facing the reproducing head 2 of the erasing head 4;
At least one of the other side surface 3a of the reproducing head 3 facing the outrigger 5 and the side surface 5a of the outrigger 5 facing the reproducing head 3 also has ultraviolet curing property and thermosetting property, and has a temperature of 25 (° C.). ) Is from 250 to 15
A resin of 00 (cp) is applied. The resin referred to here is used to bond between a pair of magnetic heads, is mainly composed of a resin, and includes a normal adhesive containing a solvent and the like in addition to the resin.

As such a resin (adhesive), Th is used.
Typical organic adhesives such as 3068B (trade name) manufactured by Lee Bond, BU-130U and BU-420UF (trade name) manufactured by Toa Gosei Chemical Co., Ltd. are specifically exemplified.

Among them, 3068B (trade name) manufactured by Three Bond Co. has ultraviolet curing property and thermosetting property, and has an anaerobic property although the viscosity at 25 (° C.) is 280 (cp). . However, when used in the present invention, since the substrate to be bonded and the guard material are generally made of oxide, there is no catalytic action of the metal even when the outside air is shut off, so that the hardening action as an anaerobic type. Hardly occurs. Therefore, there is no problem in being anaerobic. In addition, 3068 manufactured by Three Bond Co., Ltd.
B (trade name) can be thermoset under the condition of about 100 (° C.) × 1 (hr), and is preferable because it does not cause deterioration of the MR head, crystallization of the amorphous phase, and diffusion of the thin film component.

Then, these members are arranged in a predetermined order, and each head is positioned in the track width direction and the height direction orthogonal thereto in consideration of the information recording / reproducing characteristics. The position of each member facing the magnetic recording medium is adjusted in consideration of the hit. This positioning is performed in a state where each member is pressed and sandwiched by a pair of jigs in the track width direction and moved up, down, left and right, and each member is floated in the air, as in the related art.

In this embodiment, since the resin (adhesive) has already been supplied to the opposing surface, which is the bonding surface of each member, as described above, the resin (adhesive) spreads sufficiently on the opposing surface. I have. Further, since the viscosity of the resin (adhesive) at 25 (° C.) is specified to be 250 to 1500 (cp), the members are attracted to each other, making it difficult or impossible to position the members. Positioning of these members is not difficult or impossible due to the viscous resistance of the (adhesive) itself, and positioning between the members is performed accurately and easily.

At this time, the main surface 11b of the recording head 1 where the recording gap of the recording head substrate 11 and the recording head guard material 13 faces the recording gap and the main surface 13b connected to the main surface 13b are formed as described above. The main surface 14b of the reproducing head 2 and the main surface 14b of the reproducing head substrate 14 where the reproducing gap faces and the main surface 16b connected thereto are formed as described above. Since the main surface 17b of the reproducing head 19 and the reproducing head substrate 17 facing the reproducing gap and the main surface 19b connected thereto are formed as described above, the magnetic recording in which the gap between the recording head 1 and the reproducing heads 2, 3 faces. The medium facing surface is a substantially inclined surface that is inclined so as to descend outward with the gap of the recording head 1 being substantially the apex. Further, the main surface 4 of the erase head 4 where the magnetic gap faces.
Since the main surface 5b and the main surface 5b which is the upper surface of the outrigger 5 also have an inclined surface which descends toward the outside, after the respective members are bonded and fixed, the whole descends toward the outside centering on the recording head as a whole. This forms an inclined surface.

Next, a resin (adhesive) interposed between the members
Is irradiated with ultraviolet rays, and only the outside is hardened and temporarily hardened, and the members are temporarily fixed. At this time, it is preferable that the resin (adhesive) is protruded from the opposing surface of each member at the time of positioning of each member, and this is temporarily cured by ultraviolet curing to temporarily fix the members.

Subsequently, each temporarily fixed member is removed from the jig and transported to a heating means such as a heating furnace, where the resin (adhesive) is cured by heating, and the pair of magnetic heads is bonded and fixed. At this time, as described above, the resin (adhesive) is sufficiently distributed on the opposing surface of each member, and the resin (adhesive) is thermally cured, so that the inside of the resin (adhesive) is surely cured. Thus, the members are securely bonded and fixed, and the environment resistance of the bonded portion is improved. The heating conditions are set to 150 degrees to prevent the MR head from deteriorating, amorphous crystallization, and the diffusion of thin film components.
(° C.) or less.

In the present embodiment, since the viscosity of the resin (adhesive) is in the above-mentioned range, the thickness of the adhesive portion to be cured does not become too large, and the exposed portion to the outside air is reduced. The environment resistance of the bonded portion is improved without excessively increasing the weather resistance of the bonded portion.

Further, in this example, the resin (adhesive)
As a normal organic adhesive is used, and since this organic adhesive has better environmental resistance than the instantaneous adhesive conventionally used, the environmental resistance of the bonded portion is improved. .

Subsequently, as shown in FIG.
And a pair of reproducing heads 2 and 3 disposed in parallel with the direction indicated by arrow F in FIG. 2 via the recording head 1. Erasing head 4 arranged opposite to
A magnetic head block 21 having an outrigger 5 disposed opposite to the recording head 1 via a recording medium 1 is adhered to a pedestal 22 called a housing. The pedestal 22 has a substantially L-shaped cross section as shown in FIG.
The magnetic head block 21 is fitted into and supported by the magnetic head block 3.

In the magnetic head block 21, the surface where the gap between the reproducing head 2, the recording head 1 and the reproducing head 3 faces is a substantially inclined surface which descends from the recording head 1 to the outside as described above. This surface is the medium sliding surface 21a.

The magnetic head block 21 records an information signal as a magnetic signal on a tape-shaped magnetic recording medium (not shown) and reproduces the magnetic signal recorded on the tape-shaped magnetic recording medium. The tape-shaped magnetic recording medium comes into contact with the magnetic head block 21 such that its longitudinal direction is parallel to the directions indicated by arrows F and R in FIG.

In the magnetic head block 21,
The magnetic signal recorded by the recording head 1 is reproduced by the reproducing head 2 or 3 by a so-called read-after-write method. That is, the tape-shaped magnetic recording medium is
When traveling at high speed in the direction indicated by the middle arrow R, the magnetic signal recorded by the recording head 1 is transmitted to the reproducing head 2 located at the subsequent stage.
Reproduced by. On the other hand, when the tape-shaped magnetic recording medium travels at a high speed in the direction indicated by the arrow F in FIG. 2, the magnetic signal recorded by the recording head 1 is reproduced by the reproducing head 3 located at the subsequent stage.

Further, a flexible printed wiring board for drawing (not shown) connected to each member is pulled out from the lower part of the housing, and a flexible printed wiring board for user 24 shown in FIG. As shown in FIG. 4, the magnetic head is arranged on the actuator 25 to complete the composite magnetic head 26 as shown in FIG.

In the composite magnetic head 26 configured as described above, the tape-shaped magnetic recording medium is pressed against the magnetic head block 21 by the urging means (not shown) provided via the magnetic head block 21. It is energized as follows.

That is, when the composite magnetic head is manufactured as in this example, at least one of the opposing surfaces of each member has ultraviolet curability and thermosetting, and has a viscosity at 25 (° C.) of 250 to 1500. (Cp) resin (adhesive)
After applying, the members (adhesive) are opposed to each other via the resin (adhesive) and aligned, so that the resin (adhesive) is sufficiently supplied between the members, and the environmental resistance of the bonded portion is improved. The environmental reliability of the manufactured composite magnetic head is improved.

Further, since the viscosity of the resin (adhesive) is in the above-mentioned range, the members are attracted to each other at the time of positioning, and it becomes difficult or impossible to position the members. It is not difficult or impossible to perform these alignments due to the viscous resistance of the agent) itself, the alignment between the members is accurately and easily performed, and the production yield is improved.

Further, the resin (adhesive) is irradiated with ultraviolet rays to cure only the surface side to be pre-cured, the members are temporarily fixed, and the resin (adhesive) is heated and cured. Even if the interior of the resin (adhesive) is not cured at the time of temporary fixing, the interior is completely cured by heating in the post-process, and the environmental resistance of the bonded part is improved, The environmental reliability of the manufactured composite magnetic head is improved.

When positioning the pair of magnetic heads, the resin is allowed to protrude from the opposing surface, and the protruded resin is irradiated with ultraviolet rays to be preliminarily cured to temporarily fix the pair of magnetic heads. The temporary fixing between the magnetic heads is more reliably performed, and the environmental reliability of the manufactured composite magnetic head is further improved.

Further, a normal organic adhesive is used as the resin (adhesive), which has better environmental resistance than the instantaneous adhesive. The environmental reliability of the manufactured composite magnetic head is also improved.

Here, the present invention relates to a thin film head and an MR head.
Although an example in which the present invention is applied to the manufacture of a composite magnetic head using a head has been described, it goes without saying that the present invention is also applicable to the manufacture of a magnetic head in which other various magnetic heads are combined.

[0077]

EXAMPLES Next, in order to confirm the effects of the present invention, the following experiments were conducted.

Experimental Example 1 In this experimental example, composite magnetic heads were manufactured by a manufacturing method to which the present invention was applied and a conventional manufacturing method, and their environmental reliability was investigated.

First, the recording head 1, the reproducing heads 2, 3, the erasing head 4, and the outrigger 5 as shown in FIG.
Was prepared. A recording head substrate and a recording head guard made of Al ₂ O ₃ .TiC (so-called Altic material) are used as the recording head 1 and a thin film head is used as a recording head chip. And a reproducing head guard material made of Ni-Zn ferrite and a reproducing head chip made of an MR head, and a magnetic core of Mn-
Outrigger 5 made of Zn ferrite
Used was made of, for example, Mn-Zn ferrite.

By applying the present invention, it has ultraviolet curability and thermosetting, and has a viscosity at 25 (° C.) of 250 to
Three which is 1500 (cp) resin (adhesive)
3068B (trade name) manufactured by Bond Co. was applied to the opposing surface (adhesive surface) of each member.

The above-mentioned three bond product of Three Bond Co., Ltd.
068B (trade name) is an adhesive having ultraviolet curability and heat curability, a modified acrylate as a main component, and a viscosity at 25 (° C) of about 280 (cp). However, 3068B (trade name) manufactured by Three Bond
Has anaerobic properties. However, when used in the present invention, since the substrate to be bonded, the guard material, the magnetic core, and the outrigger are made of a general oxide,
Even when the outside air is shut off, there is no catalytic action of the metal, so that hardening action as an anaerobic type hardly occurs. Therefore, there is no problem in being anaerobic. Also, this Three Bo
3068B (trade name) manufactured by nd is 100 (° C) x 1
Thermal curing is possible under the condition of (hr), and it is preferable because deterioration of the MR head, crystallization of amorphous phase, and diffusion of thin film components do not occur.

Next, the positioning of these members is performed by the above-described method. In particular, the positioning is performed so that the adhesive protrudes from the opposing surface, and the adhesive is irradiated with ultraviolet rays to be pre-cured. Temporarily stopped.

Thereafter, the above adhesive was applied at 100 (° C.) × 1
Heating and curing were performed under the condition (hr), and the components were bonded and fixed to form a magnetic head block, which was disposed on a pedestal called a housing. The size of each member is shown in FIG.
As shown in FIGS. 5A and 5B, the entire width indicated by W in FIG. 5A is 11.8 (mm).
Width of the recording head 1 shown in ₁ is 1.4 (mm), Fig. 5
5A, the width of the reproducing head 2 and the reproducing head 3 indicated by W ₂ and W ₃ is 2.8 (mm), and the width of the erasing head 4 indicated by W ₄ in FIG. 5A is 2.4 (mm). , the width of the outrigger 5 shown at medium W ₅ FIGS. 5 (a) have been made and 2.4 (mm). The length in the track width direction of each member indicated by L in FIG. 5A is 14.1 (mm). Further, the distance from the top of the magnetic head block 21 indicated by H in FIG. 5B to the upper surface of the pedestal 22 is 3.45 (mm).

Thereafter, as described above, the actuator was arranged to complete the composite magnetic head. This composite magnetic head is referred to as Sample 1.

For comparison, the same members as those of the sample 1 were used, and the members were bonded and fixed with an instantaneous adhesive in the same manner as before, without disposing an adhesive in advance on the opposing surface of each member. A composite magnetic head was manufactured in the same manner as in Sample 1, except that the UV irradiation and heating steps were omitted. This will be referred to as sample 2. In addition, Cemedine 300TX (trade name) was used as the instant adhesive.

Next, the environmental reliability of the samples 1 and 2 was examined. Here, the environmental reliability was evaluated based on the amount of change in the adhesion accuracy of the magnetic head block when left unattended under predetermined conditions.

The environmental conditions to be left were three types. The first condition is a condition of leaving the device at a temperature of 40 (° C.) and a relative humidity of 93 (%) for 21 days.
After leaving for 96 hours at a temperature of 0 (° C), the temperature was lowered to -40 (° C).
The conditions of the second and third types that are left for 72 hours at a temperature of 60 ° C. are as follows.
The condition 3 is a condition 3 in which a cycle of standing at a temperature of (° C.) for 30 minutes is repeated 100 times.

FIGS. 6 (a), (b),
The variation amounts in three directions as schematically shown in FIG.

The variation in the first direction is shown in FIG.
A variation amount of the Y direction deviation is the track width direction shown in, as shown in the middle A FIG. 6 (a), the the center of the channel C ₁ of the recording gap of the recording head 1, the reproducing head (in FIG. was the amount of change of deviation between the centers of the channels C ₂ to be corresponding to the channel C ₁ of the gap is.) illustrates a playback head 2.

The variation in the second direction is shown in FIG.
(A) is a variation amount of the deviation in the X direction which is the magnetic tape running direction orthogonal to the track width direction shown in (a). FIG. 6 (b)
As shown in the middle B, the center of the recording gap of the recording head 1 in the track width direction and the center of the gap of the reproducing head or the erasing head (the reproducing head 2 is illustrated in the drawing) in the track width direction are originally parallel. If there is a shift, an angle as shown in FIG. Therefore, this angle was used as the amount of deviation in the X direction.

Further, the variation in the third direction is the variation of the displacement in the Z direction, which is the height direction of the magnetic head block, shown in FIG. 5B. 6C, the upper surface 1a of the recording head 1 and the upper surface 2 of the reproducing head or the erasing head (the reproducing head 2 is illustrated in the figure).
a are parallel in nature, and when a shift occurs, an angle as shown by C in FIG. Therefore, this angle was used as the variation of the deviation in the Z direction.

Then, after the samples 1 and 2 were allowed to stand under the conditions 1 to 3, the fluctuation amounts in the above three directions were measured. It should be noted that three samples 1 and 2 were each left under each condition, and the average of the variation in each direction was determined. At this time, the fluctuation amount in the Y direction (A
Lignent) is 1.5 (μm) or less, the variation in the X direction (Azimut) and the variation in the Z direction (Zeni).
Th) of 1.5 (min) or less was evaluated as having good environmental reliability.

As a result, in the sample 1 manufactured by applying the present invention, the above conditions were satisfied in all of the conditions 1 to 3, and the environmental reliability was good. On the other hand, in the sample 2 manufactured conventionally, the above conditions could not be satisfied in all of the conditions 1 to 3, and the environmental reliability was not good.

A composite magnetic head manufactured in the same manner as in Sample 1 except that the recording head substrate of the recording head and the recording head guard material were formed of Al ₂ O ₃ .TiO ₂ , a recording head substrate of the recording head, The environmental reliability was also examined for the composite magnetic head manufactured in the same manner as in Sample 1 except that the recording head guard material was formed of Al ₂ O ₃ .SiC. It was good.

Further, in the sample 1, the opposing surface of each member is a flat surface. On the other hand, a member having the opposing surface having a concave portion for storing the adhesive is prepared. The environmental reliability of the composite magnetic head manufactured as described above was also examined. The environmental reliability of this composite magnetic head was also good.

That is, from these results, it was confirmed that in the composite magnetic head manufactured by applying the present invention, the environmental resistance of the bonded portion was improved and the environmental reliability was improved.

Experimental Example 2 In this experimental example, the effect of the viscosity of the resin (adhesive) on the ease of positioning of each member and the adhesive strength between the members was investigated.

That is, the recording head 1 and the reproducing head 2 used in Experimental Example 1 are adhered to each other with a resin (adhesive) having a different viscosity and having at least an ultraviolet curable property. The adhesive strength was investigated.

As a resin (adhesive), 1323 (trade name) manufactured by Three Bond Co., whose viscosity at 25 (° C.) is 100 (cp) or less (about 90 (cp)), was prepared as an adhesive sample 1. , A 601UV (trade name) manufactured by Loctite having a viscosity of 100 to 150 (cp) at 25 (° C) is prepared as an adhesive sample 2, and a Three Bond having a viscosity of about 280 (cp) at 25 (° C) is prepared. 3068B (trade name) manufactured by Toa Gosei Chemical Co., Ltd. having a viscosity of about 400 (cp) at 25 (° C.) is prepared as an adhesive sample 3.
Prepare 20UF (trade name) as adhesive sample 4,
BU-130UF (trade name) manufactured by Toa Gosei Chemical Co., Ltd. having a viscosity of about 1000 (cp) at 25 (° C.) was prepared as the adhesive sample 5. Although all of these have anaerobic properties, they can be used in the present invention even if they have anaerobic properties as described above. In addition, all of them except for Sample 1 have a property of thermosetting at a temperature of 150 (° C.) or less.

As a result, when the adhesive sample 1 was used, each member could hardly be moved, and positioning was very difficult. Note that this is 150
Thermal curing below (° C.) was not possible.

When the adhesive sample 2 was used, it was difficult to move each member independently, and it was difficult to perform positioning. The adhesive strength after thermosetting was almost the same as when the instant adhesive was used.

Further, when the adhesive sample 3 is used, it is very easy to move each member independently, the alignment is very easy, and the adhesive strength after thermosetting is such that the material is broken. It was so expensive.

Furthermore, when the adhesive sample 4 is used, it is very easy to move each member independently, the alignment is very easy, and the adhesive strength after thermosetting is material destruction. It was so high that

When the adhesive sample 5 is used, each member can be moved independently, alignment is relatively easy, and the adhesive strength after thermosetting is such that the material is destroyed. Was expensive.

The viscosity of the adhesive and the ease of positioning are as follows:
It seems that there is a relationship schematically shown in FIG.
In FIG. 7, the horizontal axis indicates the viscosity of the adhesive, the vertical axis indicates the difficulty of alignment, and the vertical axis indicates that the alignment becomes more difficult as the position increases.

That is, if the viscosity of the adhesive is low, suction between the members occurs, and it is very difficult to perform positioning, and as the viscosity increases, the suction decreases, and positioning becomes easier. Then, when the viscosity of the adhesive increases to some extent, the viscosity resistance of the adhesive itself increases, which makes alignment difficult, and when the viscosity of the adhesive further increases,
The viscous resistance of the adhesive itself increases significantly, making alignment very difficult.

Specifically, when the allowable amount of the alignment difficulty is represented by L ₁ and the more preferable amount is represented by L ₂ , if the viscosity of the adhesive is 200 to 1500 (cp), the difficulty of the alignment is difficult. Is acceptable and the viscosity of the adhesive is 250-10
If it is 00 (cp), the difficulty of alignment is in a more preferable range.

Therefore, in the adhesive samples 1 and 2 having a viscosity of less than 200 (cp), it is considered that the adhesion occurred between the respective members and the alignment was very difficult. Further, in the adhesive sample 3 having a viscosity of about 280 (cp) and the adhesive sample 4 having a viscosity of about 400 (cp), adsorption between the members and an increase in the viscosity of the adhesive itself occurred. Adhesive sample 5 whose alignment was very easy and viscosity was 1000 (cp)
In, it is considered that the viscosity resistance of the adhesive itself was slightly increased, and the difficulty in alignment was slightly increased as compared with the adhesive samples 3 and 4.

From these facts, as in the present invention, at least one of the pair of magnetic heads has an ultraviolet curable property and a thermosetting property on the facing surface, and has a viscosity at 25 (° C.) of 250 to 1500. It has been confirmed that if a resin (cp) is applied and the pair of magnetic heads are positioned so as to face each other with the resin interposed therebetween, it is possible to accurately and easily align them. Was.

[0110]

As described above, in the method of manufacturing a composite magnetic head according to the present invention, the facing surface of at least one of the pair of magnetic heads has ultraviolet curability and thermosetting properties. The viscosity at 25 (° C.) is 250 to 1
After applying the resin of 500 (cp), the pair of magnetic heads are opposed to each other via the resin and aligned, so that the alignment of the pair of magnetic heads is performed accurately and easily, and the pair of magnetic heads is aligned. It is possible to manufacture a composite magnetic head with improved adhesion between the heads and improved environmental resistance, and the production yield is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a method of manufacturing a composite magnetic head according to the present invention in the order of steps, and showing a step of preparing each magnetic head.

FIG. 2 is a perspective view illustrating a method of manufacturing a composite magnetic head according to the present invention in the order of steps, and illustrating a step of bonding a magnetic head block to a pedestal.

FIG. 3 is a perspective view showing a method of manufacturing the composite magnetic head according to the present invention in the order of steps, showing a step of arranging a flexible printed wiring board for a user and mounting the flexible printed wiring board on an actuator.

FIG. 4 is a perspective view illustrating a method of manufacturing a composite magnetic head according to the present invention in the order of steps, showing a completed composite magnetic head.

5A and 5B are a plan view and a side view showing the composite magnetic head.

FIG. 6 is a schematic diagram showing the amount of change in bonding accuracy in the composite magnetic head.

FIG. 7 is a diagram schematically showing the relationship between the viscosity of an adhesive and the difficulty of alignment.

FIG. 8 is a perspective view illustrating a conventional method of manufacturing a composite magnetic head in the order of steps, and illustrating a step of preparing each member.

FIG. 9 is a side view schematically showing a conventional method of manufacturing a composite magnetic head in the order of steps, in which a read head is sandwiched between jigs.

FIG. 10 is a side view showing a conventional method of manufacturing a composite magnetic head in the order of steps and showing a step of bonding and fixing each member.

[Explanation of symbols]

1 Recording head, 1a, 1b, 2a, 2b, 3a, 3
b, 4a, 5a side surface, 2, 3 reproducing head, 4 erasing head, 5 outrigger

Claims (3)

[Claims] At least one of a pair of magnetic heads has an ultraviolet curing property and a thermosetting property on a facing surface of the magnetic head and has a viscosity at 25 (° C.) of 250 to 1500 (c).
p) a step of applying a resin, a step of positioning the pair of magnetic heads so as to face each other with a resin therebetween, and temporarily irradiating the resin with ultraviolet rays to temporarily cure the pair of magnetic heads. A method of manufacturing a composite magnetic head, comprising: a step of stopping; and a step of heating and curing the resin to bond and fix a pair of magnetic heads. 2. In the step of positioning the pair of magnetic heads facing each other with a resin interposed therebetween, the resin is protruded from an opposing surface, and the protruded resin is temporarily cured by irradiating ultraviolet rays to the pair of magnetic heads. 2. The method according to claim 1, wherein the magnetic head is temporarily fixed. 3. The method of manufacturing a composite magnetic head according to claim 1, wherein said pair of magnetic heads are a recording magnetic head and a reading magnetic head.