JPS61202313A - Method for assembling magnetic head for floppy disk - Google Patents

Abstract

PURPOSE:To shorten the assembling time of a magnetic head by pressing elastically the head chip groups stacked on a groove part to weld a cover for head clamp tool and adhering the head chip groups to each other after taking out the clamp tool main body and the cover. CONSTITUTION:The both side faces C of the head chip groups are arranged evenly so as to produce no level difference, and a ceramic slider 1 of the head is pressed to adhere a gimbal adhesion face A close to a reference face D. Then head cores 2a, 2b and 3 and the rear end part of a reinfocing ceramic matter 4 are pressed independently for adhesion of each front end part to a reference face F. Thus the size (c) of the head chip group is decided by the face C, a core gap forming face B and the positioning of the face A against the face B. Then, a cover 38 for clamp tool is fixed to the clamp tool main body 32, and the head chip group is clamped to the bottom surface of a head holding groove 45 of the main body 32. The clamp tool is taken out after the external pressure of each part is released, and the head chip groups are adhered to each other. In such a way, the assembling time is shortened for a magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a method of assembling a magnetic head for a tunnel erase type floppy disk.

<Prior art> Conventionally, the method of assembling a magnetic head by combining multiple magnetic head chips is to manually attach each chip to a jig that clamps the head and use tweezers or vacuum suction tweezers to stand the chip up along a reference surface. After stacking and pressing, the chips were manually pressed against the reference surface using a tool, and then clamped and bonded. In addition, one of the factors that has the most significant effect on the magnetoelectric conversion characteristics of a finished magnetic head is the gap depth of the head core, and as a method to reduce the variation in gap depth, it is possible to・Measure the gap depth when the core is alone, and after the head is assembled and bonded, measure the dimension from the gimbal mounting reference surface to the gap surface, that is, the assembly accuracy, and compare this dimension with the gap depth of the core alone. Calculate the final polishing allowance from
The materials were divided and sorted into meters, and final finishing processes such as polishing, lapping, and boring were performed several times.

However, with the dramatic improvement in recording density in recent years, magnetic heads have become narrower gaps and narrower tracks, and have become smaller and thinner.Assembling magnetic heads is often extremely difficult, and assembly requires manual labor. It is no longer possible to respond adequately. In addition, there are problems with chip breakage due to the strength of the chip itself due to the miniaturization and thinning of the head chip, long assembly times, long time required for accuracy classification after assembly, and a long final polishing process. There are problems such as
Eventually, variations in the magnetoelectric conversion characteristics of the head occur, which is a major cause of reduced yield and increased cost.

<Objective of the Invention> The present invention has been made in view of the above, and is capable of simultaneously performing side positioning of a magnetic head and height adjustment of a gap forming surface and a ceramic reflex slider reference surface in a short time.
By providing a method that can extremely reliably perform the above positioning and adjustment, it is possible to improve the assembly accuracy, that is, to improve the dimensional accuracy of the spacing between the erase head gap and the write-read head gap, and to improve the gimbaling of the ceramic slider. By reducing the variation in height between the bonding reference surface, the gap forming surface of the two erase head cores, the write-read core, and the ceramic reinforcing body, the assembly accuracy measurement after assembly and bonding is omitted, thereby making it possible to improve the accuracy of the core as a single core. The aim is to reduce production costs by controlling the final polishing allowance by simply measuring the gap depth.

<Structure of the Invention> The method for assembling a magnetic head for a floppy disk according to the present invention is to attach each chip group constituting a magnetic head to a head clamp jig body having a groove having openings at both ends in a predetermined order in the groove. The head clamp jig bodies are stacked on the bottom surface of the first head clamp jig, which are arranged in parallel with each other at a predetermined distance. a second reference plane; perpendicular to the second reference plane, and the first. The third slider is slidable in the direction along the second reference plane. A head positioning jig having a fourth reference surface is provided in a head positioning jig in which the direction of the groove portion is the same as that of the first reference surface. Among the head chips mounted perpendicularly to the second reference plane and stacked in the groove in the head clamp jig, the ceramic slider is attached so that its bonded surface to the gimbal spring corresponds to the first reference plane. The respective head cores and reinforcing ceramic bodies are pressed by respective pressing members so that the head cores and the reinforcing ceramic bodies are in contact with the second reference surface, and the front ends of the head cores and the reinforcing ceramic bodies are pressed with the third reference surface. Slide the fourth reference surface to align both sides of each head chip group, and in this state apply the head clamp jig main body to elastically press the head chip groups stacked in the groove onto the bottom surface thereof. The method is characterized in that the head clamp jig lid is fixed, and then the head clamp jig main body and lid are taken out from the head positioning jig, and each head chip group is adhered to each other.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 7 is an exploded perspective view showing a configuration example of a tunnel erase type floppy disk magnetic head assembled by the assembly method of the present invention, and FIG. 8 is a side view after the assembly. In the figure, 1 is a ceramic slider 2a bonded to a gimbal spring.

Reference numeral 2b denotes an eraser rad core, 3 a write-read rad core, and 4 a reinforcing ceramic body, which are assembled by bonding their mutually contacting surfaces with an adhesive.

When assembling these head chip groups, it is necessary to take into account the following points. That is, alignment of the core gap forming face and mouth face of the head shown in FIG.
The positioning of the head in the side reference surface rotation should be performed accurately to avoid the generation of a step, and the height dimension C between the adhesive surface to the gimbal spring in the ceramic slider l and the core gap forming surface should be made uniform. is important. That is, the completed product after assembly is the erasing head core 2a or 2b shown in FIGS. 9 and 10.

The gap depths b and a of the RAD core 3 for writing and reading are the most important factors that influence the magnetoelectric conversion characteristics of the head. After assembly, rough polishing is performed using the method described below, followed by ramping and boring.

FIG. 1I is an explanatory diagram of the rough polishing method, and FIG. 12 is an enlarged sectional view of the main part thereof. The gimbal bonding surface and the mouth surface of the ceramic slider 1 of the magnetic head are fixed by wax or the like to the end surface of the polishing jig 5 in which the core escape hole 9 is formed, and then fixed to the polishing jig drive shaft 6 and rotated. Further, the polishing grindstones 7 provided opposite to each other are rotated to polish the core gap forming face and the mouth face to form a predetermined gap depth. After processing, the polishing jig 5 is removed and the process proceeds to the next step, where lapping and boring with diamond abrasive grains are performed to finish the gap to a predetermined final gap depth and make the core gap forming face a mirror finish. In the polishing process, by reducing the variation in the height dimension C between the gimbal bonding surface and the core gap forming surface of the ceramic slider 1 explained in FIG. 8, the gap depth in FIGS. 9 and 10 can be reduced. Head cores with constant thicknesses a and b can be simultaneously fixed on the polishing jig 5 and processed simultaneously, thereby making it possible to polish them to the final gap depth. If there is a large variation in the dimension C in FIG. 8, there will be a large variation in the gap depth even if parallel polishing is performed at the same time, which will cause variation in the magnetoelectric conversion characteristics.

Furthermore, if a step is formed between the erasing cores 2a, 2b and the write-read core 3 on the side surface of the head in FIG.
1 does not fall within an appropriate dimension, and normal characteristics as a head cannot be expected.

Now, in the embodiment of the present invention, as shown in FIG. 8, each chip constituting the head is pressed separately in directions 21 to P5 to obtain the mouth surface and dimension C, and in both directions perpendicular to the plane of the drawing. The side and mouth surfaces of the head are aligned by pressing the head, and in that state, a clamping force of P is applied to perform the bonding work.A specific explanation will be given below with reference to the jig used in the embodiments of the present invention. conduct.

FIG. 1 is a front view of the head positioning adjustment jig, and FIG. 2 is a right side view thereof. FIG. 3 shows a partially cutaway view of FIG. 1. This head positioning adjustment jig is composed of a main body 12 and a slide body 17 that can be slidably adjusted in the left-right direction in FIG. 1 with respect to the main body.

A notch 13 is formed in the center of the right end of the main body 12, into which a clamp jig, which will be described later, is fitted. The suction pocket 14, which is connected to the suction pump that is not installed, is held by vacuum suction and positioned by the suction pocket 14, which communicates with the suction pump.

Two slide shafts 16 are fixed to the slide body 17, and these slide shafts 16 are slidably fitted into a slide guide 15 formed in the main body 12. This slide body 17 is formed with a protrusion 18 that is inserted into the notch 13 of the main body 12. Form a reference surface image.

The opening of the notch 13 of the main body 12, which faces parallel to the first reference surface, forms a second reference surface against which the same core gear forming surface of the head core group comes into contact.

A spring (not shown) is interposed between the slide body 17 and the main body 12, and the slide body 17 is always pressed to the right in FIG. 1 by this spring. The slide body 17 is provided with a pressing bolt 31 for positioning the slide body 17 by sliding it to the left against the pressing force of this spring.
By tightening the pressing bolt 31, the first and second reference planes and distances are set. In addition, when inserting and removing the clamp jig, by loosening the pressing bolt 31, the distance can be expanded and the work can be made easier. Note that 244 is a stopper that restricts the amount of movement of the slide body 17.

The main body 12 is provided with side pressure bodies 20 and 21 which are slidable in the vertical direction in FIG. A third plate is formed to form a flat surface, and is used to abut the side surfaces of each head chip group and align them without any difference in level. A fourth reference plane is formed. The side pressing bodies 20 and 21 have respective other ends protruding outward from the main body 12, and a reference face plate 22 forming a part of the second reference 100 days of the notch 13 of the main body 12. They are each pressed outward of the main body 12 by springs 33 interposed therebetween. Side pressing body 20.21
The third end is pressed against the pressing force of the spring 33 by externally pressing the other end with an actuator or the like. The fourth reference planes approach each other in a direction along the first or second reference plane picture or plane, respectively. Note that the side pressing bodies 20, 2
The outward sliding end of 1 is regulated by a stopper 23.

As shown in FIG. 3, the main body 12 is also provided with a slider pressing rod 25 that is slidable in a direction perpendicular to the second standard 100 days. This slider pressing rod 25 is constantly pushed to the left in FIG. 3 by a spring 34, but by displacing it to the right against this spring 34 from the outside, its tip presses the ceramic slider 1 of the head. Then, the four gimbal adhesive surfaces can be brought into contact with the first reference surface image. Note that 26 is a stopper that restricts the left sliding end of the slider pressing rod 25.

Furthermore, a comb-shaped pressing member 27 is disposed on the slide body 17 and is slidable in a direction perpendicular to the first reference surface image. This comb blade-shaped pressing member 27 is constantly pushed to the right in FIG. 3 by a spring 36.
By displacing the erase core 2a of the head to the left in FIG.

2b, write-read core 3. As will be described in detail later, the rear end portions of the reinforcing ceramic body 4 can be pressed separately to bring the front end portions (the surfaces facing the core gear forming surface) into contact with the second standard 100 days. can. In addition,
28 is a lid for guiding the comb-blade-shaped pressing member 27, and 29 is a lid for holding the spring 36 and determining the right sliding end of the comb-blade-shaped pressing member 27.

FIG. 4 is an external view showing the clamp jig. The clamp jig consists of a clamp jig main body 32 and a clamp jig lid 38.

The clamp jig main body 32 has a head holding groove 45 that is open at both ends in the center thereof, and one end face perpendicular to the head holding groove 45 is connected to the cut of the head positioning jig main body 12. The second reference 100 days of the notch 13 forms a clamp jig reference surface that is attracted. An relief groove 46 is formed in this clamp jig reference surface concavity,
When the core gear forming west portion of the head chip group is aligned with this mouth surface, the side surface of the head chip group protrudes from the bottom surface of the relief groove 46 by a predetermined amount. Along this relief groove 46, the aforementioned side pressing body 20.21 is slid, and the third. The fourth reference two ports abut on both sides of the head chip group, respectively. Further, the first reference surface rotation of the slide body 17 of the head positioning jig is formed by tightening the pressing bolt 31, as shown in FIG. It will invade the gap.

The clamp jig lid body 38 can be attached to and detached from the clamp jig main body 32 using fixing screws 42, and a pair of pressure pins 39 are disposed at the center of the lower surface of the clamp jig lid body 38 so as to be slidable in the axial direction. The pressure pin 39 is attached to the fixing plate 41. It is pressed downward by a pair of leaf springs 40 fixed by screws 43. When this clamp jig lid 38 is fixed to the clamp jig main body 32, the group of head chips stacked in the head holding groove 45 is pressed onto the bottom surface of the head holding groove 45 by the plate spring 40 via the pressure pin 39. It will be pressed and clamped.

FIG. 5 shows an enlarged perspective view of the vicinity of the hent tip group when the head chips are stacked in the head holding groove 45 of the clamp jig main body 32 and mounted on the head positioning jig, and shows the comb-like pressing described above. The details of the member 27 will be explained.

A plurality of grooves 47 parallel to the sliding direction of the comb-shaped pressing member 27 are formed, and within each of the grooves 47 are slidable core pressing plates 35a.

35b, 35c, and 35d are inserted. Each core pressing plate material 35 has its rear end connected to the comb blade-shaped pressing member 2.
It is supported by an elastic body 37 fixed to 7. The tip of each core pressing plate member 35 forms a pressing surface for pressing the rear end portion (on the side opposite to the core gear forming face opening) of the eraser rad cores 2a, 2b and the write-read rad core 3, respectively. That is, the core pressing plate material 35a
The side surface and m-plane of the tip of 35c and 35c are the first
The G and 1 parts of the write-read RAD core 3 shown in FIG. Press the part. Therefore, each pressing surface is provided with a step corresponding to the shape of the rear end of each core. Further, the tip end surface opening of the main body of the comb blade-shaped pressing member 27 forms a surface that presses the reinforcing ceramic body 4. By pressing the head chip group with the blade-like pressing member 27 in this manner, each chip is independently pressed and tightly attached to the second reference surface of the head positioning jig main body 12 at its front end. become.

Now, the procedure for assembling a magnetic head using each of the above-mentioned jigs will be explained.

First, the clamp jig main body 32 is inserted into the notch 13 of the main body I2 of the head positioning jig, and the suction pump is driven to vacuum the clamp jig reference surface opening to the second reference surface of the main body 12. Adsorb and position. Next, each head chip is sequentially stacked in the head holding groove 45 of the clamp jig main body 32 using a pick-and-place device or the like. Then, the slide body 17 of the head positioning jig is displaced by operating the pressing port 31, and the first. The distance between the second reference surface opening and the recess is set to the dimension C shown in FIG.

The following positioning operations are then performed, but the order of these positioning operations is not particularly limited.

The side pressing bodies 20, 21 are slidably displaced inward from the outside to align the openings on both sides of the head chip group so that no steps are formed.

The slider pressing rod 25 is slidably displaced inward from the outside to press the ceramic slider 1 of the head so that its gimbal adhesive is brought into close contact with the first reference plane. This pressing corresponds to P4 in FIG.

The comb blade-shaped pressing member 27 is slid inward from the outside to press the rear end of each head core 2at 2b, 3 and the reinforcing ceramic body 4 independently, and the front end of each Place it in close contact with the reference surface of 2. This pressing force is shown in FIG. 8, P+ and P2, respectively. Corresponds to P3°P5.

Through the above positioning operations, the head chip group has been positioned with respect to the side opening, the core gear forming surface opening, and the positioning of the gimbal bonding surface opening relative to the core gear forming surface opening, that is, the formation of dimension C.

In this state, the clamp jig lid 3 is attached to the clamp jig main body 32.
8 is fixed, and the hent tip group is pressed against the bottom surface of the head holding groove 45 of the clamp jig main body 32 to be clamped. This state is shown in FIG. 6 as a sectional view of the main part.

Next, the external pressure on each part is released, the pressing bolt 31 is loosened, the slide body 17 is released to the right in FIG. 1, and the clamp jig is taken out. Then, the head chip group is bonded to each other using an adhesive, and the process is completed.

Note that the present invention is not limited to the jigs shown in the above embodiments, and it goes without saying that the shape of each part can be changed as desired.

Effects> As explained above, according to the present invention, bed chips can be stacked horizontally in the clamp jig main body 32, and each pressing member provided on the head positioning jig can be pressed from the outside. The positioning of each part is done by
For example, by pressing each pressing member with an actuator, etc., it is possible to automate the process from loading the head chip group to positioning and clamping, which can significantly shorten assembly time and improve work efficiency compared to conventional methods. can be done.

Also, among the chips constituting the head, a ceramic slider 1 and magnetic helad cores 2a and 2b.

3 are pressed in opposite directions to each other to closely contact and position the first and second reference surfaces, so that variations in the dimension C between the gimbal bonding surface of the ceramic slider 1 and the core gap forming surface can be reduced. , the gap depth dimension in the final polishing process can be easily controlled. Therefore, the magnetoelectric conversion characteristics of the finished product can be equalized and the yield can be improved, and together with the aforementioned shortening of the assembly time, manufacturing costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view of a head positioning adjustment jig used in an embodiment of the present invention, Fig. 2 is a right side view thereof, Fig. 3 is a partially cutaway view of Fig. 1, and Fig. 4 is an oblique external appearance of the clamp jig. □View, 5th
The figure is an enlarged perspective view showing the vicinity of the head of the head positioning adjustment jig, Figure 6 is a vertical cross-sectional view of the vicinity of the head clamped by the clamp jig in the head positioning adjustment jig, and Figure 7 is a tunnel erase. FIG. 8 is a side view after assembly, and FIGS. 9 and 10 are plan views showing the shapes of the erasing rad core and the write-read rad core, respectively. 11 is an explanatory diagram of the rough polishing process of the magnetic head after assembly, and FIG. 12 is an enlarged sectional view of the main part thereof. 1...Ceramic slider 2a, 2b...Rad core for erasing 3...Writing/reading head core 4...Reinforcing ceramic body 12...Head positioning adjustment jig main body 17...Sliding body 20.21 ...Side pressure body 25...Slider pressure rod 27...Comb edge-shaped pressure member 32...Clamp jig body 35...Press plate 38...Clamp jig cover 39...Applying Pressing pin 45...Head holding groove 46...Escape groove...Gimbal bonding surface...Gap forming surface...Head side surface...First reference surface fixing...No. 2. Reference surface... 3rd reference surface... 4th reference surface Patent applicant Sharp Co., Ltd. Agent Patent attorney Nishi 1) New Figure 1 Figure 2 Figure 3 Figure 6 Figure 7 Figure 9

Claims (2)

[Claims] (1) In the assembly process of a tunnel erase type floppy disk magnetic head, a group of head chips consisting of a ceramic slider bonded to a gimbal spring, a write/read head core, a pair of erase head cores, and a reinforcing ceramic body are placed in a predetermined position relative to each other. This is a method of bonding based on the positional relationship, in which each chip group is stacked in a predetermined order on the bottom surface of the groove in a head clamp jig main body equipped with a groove with openings at both ends, and the head clamp is attached. The jig body has first and second reference planes arranged in parallel with each other at a predetermined interval, and the first and second reference planes.
The groove is provided in a head positioning jig that includes third and fourth reference surfaces that are orthogonal to the second reference surface and that are slidable in directions along the first and second reference surfaces. The direction is the first
, the ceramic slider is mounted perpendicularly to the second reference plane, and among the group of head chips stacked in the groove in the head clamp jig, the adhesive surface of the ceramic slider to the gimbal spring is aligned with the first reference plane. Press each of the head cores and the reinforcing ceramic body with each pressing member so that the head core and the reinforcing ceramic body come into contact with the second reference surface, and slide the third and fourth reference surfaces. Align both sides of each head chip group with the holder, and in this state, fix the head clamp jig lid to the head clamp jig body so as to elastically press the head chip groups stacked in the groove onto the bottom surface of the head clamp jig body. A method for assembling a magnetic head for a floppy disk, comprising: thereafter, taking out the head clamp jig main body and lid from the head positioning jig, and bonding each head chip group to each other. (2) When pressing the front end of each of the head cores and the reinforcing ceramic body against the second reference surface, each head core and the reinforcing ceramic body are pressed independently, so each head core and the reinforcing ceramic body are pressed independently. Claim 1, characterized in that a pressing member is used which is formed by disposing pressing plates in the shape of a wedge, each of which is slidably displaceable relative to the other along the pressing direction in accordance with the shape of the rear end portion. A method for assembling a magnetic head for a floppy disk according to item 1.