JPH0821171B2 - Method of manufacturing magnetic head - Google Patents

Description

The present invention relates to a method of manufacturing a core slider of a floating magnetic head, and more particularly to a method of chamfering the peripheral edge of an air bearing surface rail. A method of chamfering the corners of the peripheral edge of the air bearing surface rail in the core slider of the magnetic head to make the R chamfered automatically and uniformly. By using the elastic sheet having a hardness such that when the slider block before being mounted is placed on the polishing member on the elastic sheet and a load is applied, the peripheral edge of the air bearing surface rail bites into the polishing member by a predetermined amount. , The abrasive member (16) is bitten between adjacent air bearing surface rails of the slider block by a predetermined biting amount due to elastic deformation of the elastic sheet. Reciprocally and automatically reciprocating the core slider block in a linear direction relative to the surface of the polishing member, and at the time of this reciprocating movement, on the adhesive block to which the core slider block is attached, Maintaining a constant contact pressure between the core slider block and the surface of the polishing member by applying a load such as a weight, and the air bearing surface rail of the core slider block is inclined at a constant angle ± θ with respect to the reciprocating direction. That is, the number of reciprocations in the + θ direction and the number of reciprocations in the −θ direction are equal to the reciprocating direction.

Further, in the case of a magnetic head in which the hardness of the recording / reproducing element portion is different from that of the core slider portion, the core slider block is automatically reciprocated relative to the surface of the polishing member in the linear direction, and in the traveling direction. On the other hand, only when the inflow slope is located at the front end and the recording / reproducing element part is located at the rear end, the contact is made with the polishing member.

[Industrial applications]

A magnetic head for recording / reproducing information on / from a magnetic recording disk in a magnetic disk device performs recording / reproducing in a state of being levitated by wind force when the magnetic recording disk rotates at high speed. The present invention relates to a method of manufacturing a core slider of such a flying magnetic head, and more particularly to a method of chamfering a peripheral edge of an air bearing surface rail.

[R chamfer of air bearing surface rail of magnetic head]

FIG. 4 is a side view showing a state where information is recorded / reproduced by the magnetic head. H is a magnetic head, and the core 3 around which the coil 2 is wound is bonded to the rear end of the core slider 1. Then, information is recorded / reproduced on / from the magnetic recording disk 4 in the gap G between the core 3 and the core slider 1.

The core slider 1 is attached to and supported by a spring arm 6 via a thin leaf spring 5 called a gimbal,
The spring arm 6 is attached to a drive shaft 8 via a drive arm 7.

Since the magnetic recording disk 4 rotates at high speed, the core slider 1 floats by the wind force in the direction of the arrow a ₁ generated at that time. Therefore, in the gap G at the rear end, recording / reproducing is performed with a minute floating gap between the magnetic recording disc 4 and the rear end.

As described above, in order to levitate the core slider 1 by wind force, the air inflow slope 9 is formed at a position facing the magnetic recording disk 4 at the tip of the core slider 1, so that the core slider 1 is easily levitated. are doing.

FIG. 5A is a perspective view of the core slider 1. Two air bearing surface rails 10 and 11 are provided on the surface (slider surface) of the core slider 1 that faces the magnetic recording disk 4. The inflow slope 9 is formed at the tips of the air bearing rails 10 and 11. As shown in (b), the inflow slope 9 has a depth of 2 to 7 μm in the flying direction and a length of 300 to 600 μm in the air bearing surface rail direction.
The inclination angle θ is 20 ′ to 40 ′.

As shown in FIG. 4, the air bearing surface rails 10 and 11 are magnetic recording disks 4.
When the magnetic recording disk 4 is rotating at a high speed in a state of facing the magnetic recording disk 4, or when the rotation of the magnetic recording disk 4 is started / stopped, the protrusions of the magnetic recording disk 4 cause the protrusions e _{1 to} e of the peripheral edges of the air bearing surface rails 10 and 11 to e. May collide with ₄ . In such a case, the peripheral edges e _{1 to} e ₄ of the air bearing surface rails 10 and 11 are polished and chamfered to make a R chamfering of 10 to 20 μm so as not to cause a head crash.

[Conventional technology]

FIG. 6 is a perspective view of the core slider block 12 before the inflow slope is formed. After the region 9a indicated by the chain line is polished to form the inflow slope, the core slide block 12 is divided from the position indicated by the broken line 13 to several pieces. Use about 10 core sliders. And several to 10
R chamfering about one core slider at a time.

FIG. 7 is a rear view of the core slider block 12 (viewed from the side of the recording / reproducing element h), which is divided into individual core sliders from the position of the chain line. Then, as shown in FIG. 8, the individual core sliders 1 ... Are attached to the chamfering jig 14 at regular intervals. At this time, the space D between the air bearing surface rails 10 and 11 of the core slider 1 is arranged to match the distance d between the air bearing surface rails 11 and 10 of the adjacent core sliders. As a result, the distance between all the air bearing surface rails 10, 11, ... Is constant.

FIG. 9 is a perspective view showing a conventional manual chamfering method. As shown in FIG. 8, a jig 14 having a plurality of core sliders 1 ... Place it on the diamond wrapping tape 16. With the air bearing surface rails 10 and 11 applied to the diamond wrapping tape 16 in this manner, when the jig 14 is pressed by hand,
As shown in FIG. 8, the air bearing surface rails 10 and 11 bite into the diamond wrapping tape 16. In this state, the arrow
As shown by a ₂ and a ₃ , when the jig 14 is slid in a zigzag manner, the corners (e ₁ to e ₄ shown in FIG. 5) of the peripheral edges of the air bearing surface rails 10 and 11 are the strongest and the diamond wrapping tape is strong. 16
Since it hits the chamfer, it is chamfered due to wear and R is attached.

[Problems to be Solved by the Invention]

However, in such a manual R chamfering method, as shown in FIG. 8, it is necessary to separate the core slider block 12 for each core slider 1 ... Is troublesome. Further, as shown in FIG. 9, since the chamfering is performed manually, the pressing force, the sliding speed, the moving range, etc. are different, and the whole cannot be pressed uniformly, and the pressing force is unevenly distributed. is there. Therefore, even if the distance between the respective air bearing surface rails 10, 11, ... Is made constant as shown in FIG. 8, it is difficult to accurately and uniformly round the chamfers, and the finish varies depending on the operator. Therefore, the experience and skill of the operator are required.

The technical problem of the present invention is to pay attention to such a problem, and to make it possible to chamfer R in a block shape without separating the core slider blocks one by one, and also to chamfer automatically and uniformly. is there.

[Means for solving the problem]

[Invention of Claim 1] FIG. 1A is a plan view for explaining the basic principle of a method of manufacturing a magnetic head according to the present invention, and FIG. Reference numeral 17 is an adhesive block, and a core slider block 12 as shown in FIG. 7 is attached to the lower surface thereof. According to the present invention, when the slider block 12 before being separated into a plurality of sliders is placed on the polishing member 16 on the elastic sheet 15a and a load is applied, the peripheral edge of the air bearing surface rail has a predetermined distance with respect to the polishing member 16. By using the elastic sheet 15a having a hardness that bites by the biting amount,
The polishing member 16 is made to bite between adjacent air bearing rails of the slider block 12 by a predetermined biting amount by elastic deformation of the elastic sheet 15a. The elastic sheet 15a capable of such an action has a rubber hardness of, for example, 60 ° ± 10 °.
The range is suitable, and the sheet-shaped or film-shaped polishing member 16 is placed thereon, and the R chamfering is performed on the polishing member 16. The rubber hardness shown in the present specification is measured by a hardness test (a type of a spring type hardness tester A) of "JIS vulcanized rubber physical test method JIS K 6301".

Then, the adhesive block 17 is reciprocated relative to the surface of the polishing member 16 in the linear direction indicated by the arrow a ₄ and automatically.

During this reciprocating movement, a load such as a weight is applied on the adhesive block 17 to keep the contact pressure between the adhesive block 17 and the polishing member 16 constant.

Further, the air bearing surface rail of the core slider block 12 is inclined at a constant angle ± θ with respect to the reciprocating direction indicated by the arrow a ₄ . Moreover, the number of reciprocating movements in the + θ direction and the −θ direction is made equal. The angle θ is preferably about 15 ° to 45 °.

[Invention of Claim 2] In a magnetic head having a thin film type magnetic recording / reproducing element portion, as shown in FIG. 2, when the core slider block 12 is reciprocated in a linear direction, only the forward direction polishing member 16 is used. With the polishing member 16 in the backward direction so as not to contact the polishing member 16. That is, only when the inflow slope is located at the front end and the recording / reproducing element portion is located at the rear end with respect to the traveling method, the contact is made with the polishing member 16. Therefore, other than that, the number of reciprocating movements in the + θ direction and the −θ direction is the same as that of the first aspect of the invention.

[Action]

[Invention of Claim 1] As the elastic sheet 15a on which the polishing member 16 is placed, one having a hardness in the range of 60 ° ± 10 ° is used. If an elastic sheet having a hardness of, for example, 70 ° or more is used, the polishing member 16 will not sufficiently bite between the adjacent air bearing surface rails 10, 11, 10 ... And the R chamfering will be insufficient. On the contrary, if the elastic sheet is softer than 50 °, for example, the polishing member 16 bites sufficiently between the adjacent air bearing surface rails 10, 11, 10 ..., However, when the core slider block 12 reciprocates, the air bearing surface rail 1
The corners of 0 and 11 are caught in the polishing member 16 and there is a drawback that it cannot smoothly reciprocate. Therefore, if an elastic sheet having a hardness of, for example, 60 ° ± 10 ° is used as described above, as shown in FIG. 6 (b), even in the d portion where the air bearing surface rail spacing is narrow, the D portion where the spacing is wide is used. Even in
The polishing member 16 bites between the adjacent air bearing surface rails and can move smoothly.

In addition, the core slider block 12 is automatically reciprocated relative to the surface of the polishing member 16 in a linear direction, and a load such as a weight is placed on the adhesive block 17 to which the core slider block 12 is attached. Is applied to maintain the contact pressure between the core slider block 12 and the surface of the polishing member 16 constant. Therefore, the contact pressure and other conditions at the time of chamfering R are constant in each air bearing surface rail.

Moreover, the air bearing surface rail of the core slider block 12
Inclining at a constant angle ± θ with respect to the reciprocating direction, and making the number of reciprocating movements in the + θ direction and the reciprocating movement in the −θ direction equal to the reciprocating direction, the R chamfering direction of all air bearing surface rails is the same. As a result, all air bearing rails can be chamfered uniformly and with good balance.

In this way, even if the distances D and d between the air bearing surface rails are not constant, the quality of the R chamfering of the air bearing surface rails can be ensured, so that the core slider block 12 remains in a block shape without being separated as in the conventional case. R chamfering is possible. for that reason,
After forming the inflow slope 9, the R chamfering can be performed only by subsequently attaching the adhesive block to which the core slider block 12 is attached to the R chamfering device.

[Invention of Claim 2] In the case of a thin film magnetic head, the hardness of the thin film element portion h is significantly softer than that of the core slider portion. For example, Al ₂ O ₃ .Tic, which is the material of the core slider 1, is extremely hard, but Al ₂ O ₃ that constitutes the thin film element portion is soft, and the hardness difference between them is large. Therefore, the thin film element portion h is over-polished by merely reciprocating the movement as in the first aspect of the invention. However, in the method shown in FIG. 2, the polishing member 16 is contacted only in the forward direction and is floated from the polishing member 16 in the backward direction, and the directionality is set so that the thin film element portion h is always located at the rear end during the polishing operation. To have. In this manner, the thin film element portion h side and the polishing member 16 are brought into contact with the polishing member 16 with the inflow slope always at the front end and the recording / reproducing element portion at the rear end with respect to the traveling direction. Since the contact pressure with is reduced, overpolishing of the thin film element portion h can be prevented.

〔Example〕

Next, practical examples of how the R chamfering method according to the present invention is embodied will be described. FIG. 3 is a perspective view illustrating an apparatus for carrying out the method of the present invention. Table 18
An elastic sheet 15a is placed on the above, and a polishing member such as the diamond wrapping tape 16 is placed thereon. Elastic sheet
The hardness of 15a is 60 ° ± 10 °.

A head 20 is placed on a bed 19 formed in parallel with the diamond wrapping tape 16, and reciprocates in a linear direction on the bed 19. In the head 20,
A spindle 21 that moves up and down is supported directly above the diamond wrapping tape 16, and an adhesive block 17 is vacuum chucked at the lower end of the spindle 21. The core slider block 12 is attached to the adhesive block 17 in advance.

A motor for angle indexing is built in the head 20 and is connected to the main shaft 21 via a gear mechanism. Also,
By forming a rack around the entire circumference of the main shaft 21 and connecting the rack to a vertical drive motor, the main shaft 21 can be moved up and down.

Now, when chamfering the core slider block 12 having a soft portion such as a thin film element part, the spindle 21 is lowered to move the core slider block 12 to the diamond wrapping tape 16 only when the head 20 moves in the forward direction. Contact. When moving in the backward direction, by raising the main shaft 21, the core slider block 12 is separated from the diamond wrapping tape 16, and the thin film element portion is always located at the rear end of the core slider. It is possible to prevent excessive polishing.

Further, by rotating the main shaft 21, an angle of + θ with respect to the reciprocating direction is indexed, the main shaft 21 is rotated a predetermined number of times in the forward direction, then the main shaft 21 is rotated to −θ, and then is moved the same number of times in the forward direction.

It is also possible to rotate 2θ for each reciprocation and alternately perform R chamfering in the + θ direction and R chamfering in the −θ direction.

Furthermore, as long as it has directivity so that the inflow slope is located at the front end and the recording / reproducing element part is located at the rear end with respect to the traveling direction, the main shaft 21 is always rotated at the stroke end of forward / backward movement to allow the core to rotate. The direction of the slider block 12 may be reversed, and the chamfering may be performed on both sides.

When the core slider and the recording / reproducing element have the same hardness as in a magnetic head having a recording / reproducing element in which a coil is wound around ferrite, it is not necessary to raise the spindle 21 during the returning operation. That is, it is only necessary to reciprocate the core slider block 12 in contact with the diamond wrapping tape 16. After reciprocating a predetermined number of times in the + θ direction, raise the spindle 21 once, change the direction to the −θ direction, and lower it, and reciprocate the same number of times to make all the air bearing rails evenly chamfered. it can.

The load for pressing the core slider block 12 against the polishing member 16 can be set by the weight of the main spindle 21, but the main spindle 21
It is also possible to put a weight on top of it, or to apply a load by lever type or spring type.

〔The invention's effect〕

As described above, according to the present invention, as the elastic sheet 15a on which the polishing member 16 is placed, the elastic member 15a is elastically deformed, so that the polishing member 16a.
While selecting the hardness that allows a predetermined amount to bite between the adjacent air bearing surface rails of the slider block 12,
Since the air bearing surface rails are switched between + θ and −θ directions and reciprocated the same number of times, and a fixed load is applied to relatively reciprocate linearly, even if the air bearing surface rail spacing is not constant, all It is possible to chamfer the air bearing surface rail uniformly. Therefore, it is possible to chamfer the R without separating the core sliders, and it becomes unnecessary to attach the separated core sliders to the jig one by one as in the conventional case, and the work efficiency is improved. In addition, the R chamfering can be performed automatically, with high accuracy and uniformly. Further, in the case of a core slider having a soft portion such as a thin film magnetic head, the core slider block 12 rises from the polishing member 16 during the backward movement so that the soft portion is always located at the rear end in the traveling direction. Therefore, the soft portion will not be overpolished.

[Brief description of drawings]

1 and 2 are views for explaining the basic principle of the method of manufacturing a magnetic head according to the present invention, and FIG. 3 is a perspective view illustrating an apparatus for carrying out the method of the present invention. 4 is a side view showing a state in which information is recorded / reproduced by a magnetic head, FIG. 5 is a perspective view of a core slider and a side view of an inflow slope portion, and FIG. 6 is a core before formation of an inflow slope. FIG. 7 is a perspective view of a slider block, FIG. 7 is a rear view of a core slider block after forming an inflow slope, and FIGS. 8 and 9 are views showing a conventional R chamfering method for an air bearing surface rail. In the figure, 1 is a core slider, 4 is a magnetic recording disk, and 9 is a magnetic recording disk.
Is an inflow slope, 10 and 11 are air bearing rails, 12 is a core slider block, 13 is a separating position, 15a is an elastic sheet, 16 is a polishing member, 17 is an adhesive block, and 21 is a spindle.

Claims (2)

[Claims] 1. A method for chamfering a corner of a peripheral edge of an air bearing surface rail of a slider of a magnetic head to attach R, wherein a slider block before being separated into a plurality of sliders is provided.
By using an elastic sheet having a hardness such that the peripheral edge of the air bearing surface bites into the polishing member (16) by a predetermined amount when placed on the polishing member (16) on the elastic sheet and subjected to a load, Causing the polishing member (16) to bite between adjacent air bearing rails of the slider block (12) by a predetermined amount of biting due to elastic deformation of the elastic sheet, and the slider block (12) to the polishing member (16) Automatically and reciprocally in a straight line direction with respect to the surface of the slider, and at the time of this reciprocating movement, load such as a weight on the adhesive block (17) to which the slider block (12) is attached. To keep the contact pressure between the slider block (12) and the surface of the polishing member (16) constant, and the air bearing surface rail of the slider block (12) has a constant angle ± with respect to the reciprocating direction. at θ That it is obliquely, to equal the reciprocation number of the reciprocating number and -θ direction with respect to the reciprocating direction + theta direction, the method of manufacturing the magnetic head according to claim. 2. A method of chamfering the corners of the peripheral edge of an air bearing surface rail in a slider of a magnetic head to give R, wherein a slider block before being separated into a plurality of sliders is provided.
By using an elastic sheet having a hardness such that the peripheral edge of the air bearing surface bites into the polishing member (16) by a predetermined amount when placed on the polishing member (16) on the elastic sheet and subjected to a load, Causing the polishing member (16) to bite between adjacent air bearing rails of the slider block (12) by a predetermined amount of biting due to elastic deformation of the elastic sheet, and the slider block (12) to the polishing member (16) Of the polishing member (16) only when the inflow slope is located at the front end and the recording / reproducing element part is located at the rear end relative to the traveling direction.
Contact with the slider block (12) at least when the inflow slope moves forward.
By applying a load such as a weight on 7),
The contact pressure between the slider block (12) and the surface of the polishing member (16) is kept constant, and the air bearing surface rail of the slider block (12) is inclined at a constant angle ± θ with respect to the traveling direction. The method of manufacturing a magnetic head is characterized in that the number of movements in the + θ direction and the number of movements in the −θ direction are equal to the reciprocating direction.