JPH04305877A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To offer a durable and mass-producible floating magnetic head at low cost used for various kinds of information equipments by forming a desired crown quantity simply and accurately without finish wrapping. CONSTITUTION:A fine rugged section 31 is arranged on the gimbals attaching surface 3 of a floating magnetic head 2. The fine rugged section 31 is prefarably formed by slits of a sectional square, a U shape and a V shape formed orthogonally crossing the direction of air flow on a crown forming surface or by such means as a reverse spattering and an ion milling. An adjustment is easily made to gain a prescribed crown quantity (t) by properly selecting the depth and width of a recessed part, the intervals between each recessed and convexed part, the arraying number and the heat shrinking rate of an adhesive agent for bonding the gimbals and the magnetic head.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head used for recording and reproducing data in electronic computers and the like.

0002

2. Description of the Related Art In recent years, floating magnetic heads with crowns have been developed as fixed magnetic disk drives become smaller and thinner.

[0003] A floating magnetic head of 0.1 to 0.2 (μm
) In order to levitate the magnetic recording medium over the magnetic recording medium through a minute gap, it is necessary to finish the surface of the magnetic recording medium to a perfect mirror finish. However, when a floating magnetic head is used in a contact start-stop method, if the mirror surface of the magnetic recording medium and the slider surface of the floating magnetic head are left in close contact for a long period of time, the slider surface may be stuck to the magnetic recording medium surface. A phenomenon occurs in which the surface is adsorbed. If a contact start is started while the magnetic recording medium is attracted in this way, it will not only damage the surface of the magnetic recording medium and destroy the recorded information, but also destroy the support system of the floating magnetic head. When the magnetic head is stopped, the slider surface of the floating magnetic head is separated from the magnetic recording medium surface, or a floating magnetic head is used that has a crowned slider surface with a small contact area to significantly reduce the attraction force. This is desirable. However, the method of separating the slider surface of a floating magnetic head from the magnetic recording medium surface requires a certain mechanism, which complicates the structure and is difficult to avoid damaging the magnetic recording medium surface and the slider surface of the floating magnetic head. However, it is difficult to control the landing of the slider of a floating magnetic head on the surface of a magnetic recording medium, and no satisfactory solution has yet been found.

A conventional floating magnetic head will be explained below. FIG. 6 is a perspective view of a conventional floating magnetic head, and FIG. 7 is a side view thereof.

1 is a magnetic circuit component, 2 is a floating magnetic head, 3 is a gimbal mounting surface which is machined to a surface roughness Ra of 2 to 3 μm on the upper surface of the floating magnetic head 2, and 4 is a read/write device. 5 is a gimbal fixed to the upper surface of the floating magnetic head 2 with adhesive to maintain the floating attitude of the floating magnetic head 2; 6 is a coil wire for floating the floating magnetic head 2 through the gimbal 5 by the airflow generated by the rotation of the fixed disk. A load arm that applies force to the floating magnetic head, 7 an insulating tube fixed on the load arm 6, 8 a claw for fixing the insulating tube 7 formed by processing the tip of the load arm 6, 9 a This is a crown forming portion on the lower surface of the floating magnetic head 2.

In FIG. 7, reference numeral 10 indicates a gap portion provided at the minimum gap position on the slider surface facing the magnetic recording medium, and reference numeral 11 indicates an adhesive made of thermosetting epoxy resin for bonding the gimbal 5 and the magnetic head 2. be.

A method of manufacturing the conventional floating magnetic head constructed as described above will be described below with reference to FIG. 8.

When polishing the slider of the floating magnetic head 2 to a mirror finish, the crown is polished using a lapping machine 12 having a radius of curvature R corresponding to the crown amount t on the crown forming portion 3. was manufacturing.

[0009]

[Problems to be Solved by the Invention] However, with the above-mentioned conventional configuration, it is very difficult to manufacture a lapping machine with a radius of curvature R commensurate with the crown amount t, and when the lapping machine is used several times, it wears out. This causes the problem that the radius of curvature R changes, making it unusable and requiring an expensive lapping machine to be prepared each time. Furthermore, when manufacturing products with different crown amounts t, there is a problem in that an expensive lapping machine having a radius of curvature R corresponding to the crown amount t must be manufactured for each type of crown amount t.

[0010] The present invention solves the above-mentioned conventional problems, and it is possible to obtain a desired crown amount t without using an expensive lapping machine.
An object of the present invention is to provide a floating magnetic head that can be easily and accurately formed, has excellent durability, and has high productivity at a low cost.

[0011]

SUMMARY OF THE INVENTION In order to achieve this object, the floating magnetic head of the present invention has a configuration in which fine irregularities are arranged and formed on the gimbal mounting surface of the floating magnetic head.

Here, the fine irregularities formed on the gimbal mounting surface include a rectangular cross section formed perpendicular to the air inflow direction on the crown forming surface of the floating magnetic head;
U-shaped, V-shaped slit or reverse sputtering,
Preferably, the uneven portion is formed by an ion milling method or the like. In order to obtain a predetermined crown amount t, the depth and width of the slits, the spacing between each slit, the number of slits, the depth of the recesses formed by reverse sputtering, ion milling, etc., the average diameter, and the spacing between the recesses. This can be easily adjusted by appropriately selecting the spacing between each row of recesses, the number of arrays, etc., and the thermal shrinkage rate of the adhesive for bonding the gimbal and the magnetic head.

[0013] As the heat-shrinkable adhesive, both inorganic and organic types can be used, but one that has a low specific gravity, can flow into the recess with good flowability when heated, has a high shrinkage rate when cooled, and has strong adhesive strength. is preferred.

[0014]

[Operation] With this configuration, the floating magnetic head and gimbal are bonded and cured by flowing heat-shrinkable adhesive into the slits and micro-recesses formed on the gimbal mounting surface. By doing so, a bending moment M is generated in the floating magnetic head due to contraction of the adhesive in the minute slit or the minute recess, and a predetermined crown amount t can be formed on the floating magnetic head slider surface. In addition, the adhesive flows into each minute slit and each minute recess and hardens, making it possible to increase the bonding area, increasing the bonding strength between the floating magnetic head and the gimbal, and improving durability. can.

[0015]

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

FIG. 1(a) is a perspective view of the main part of the gimbal mounting surface on which the microslit of the present invention is formed, and FIG. 1(b) is a perspective view of an example of the microslit in section A of FIG. 1(a). FIG. 2 is a perspective view of a main part of a gimbal mounting surface in which minute recesses are formed in a substantially checkerboard pattern by reverse sputtering, ion milling, etc., and FIG. FIG. 4 is a perspective view of the head, FIG. 4 is a side view thereof, and FIG. 5 is a side view of the main part of the floating magnetic head when it is driven.

1 is a magnetic circuit component, 2 is a floating magnetic head, 3 is a gimbal mounting surface, 5 is a gimbal, 6 is a load arm, 7 is an insulating tube, 8 is a claw for fixing the insulating tube, 11 is an adhesive It is. Reference numeral 31 denotes an uneven portion consisting of minute slits formed on the gimbal mounting surface 3, and the shapes of the minute slits include rectangular cross-sections, U-shapes, V-shapes, inverted trapezoids, etc., as illustrated in FIG. 1(b). Any shape is acceptable as long as it can be filled with the agent. Reference numeral 32 designates a micro-recess in which micro-recesses formed by reverse sputtering, ion milling, etc. are arranged on the gimbal mounting surface 3 at predetermined intervals, and reference numeral 13 represents a magnetic recording medium.

The operation of the floating magnetic head of this embodiment constructed as described above will be described below with reference to FIGS. 4 and 5.

Adhesive 11 made of thermosetting epoxy resin flows into each minute slit 31 and hardens to bond gimbal 5 and floating magnetic head 2 together. Each minute slit 3
The adhesive 11 in the gimbal mounting surface 3 contracts as it cools and hardens, and loads f1, f2...fn act on the floating magnetic head 2, which in turn causes a load F due to contraction of the adhesive 11 on the gimbal mounting surface 3. In total, a bending moment M is generated in the floating magnetic head, and the bending moment M causes the floating magnetic head to warp, thereby easily imparting a predetermined amount of crown t to the slider surface of the floating magnetic head. Minute unevenness portion 32
However, similarly, a predetermined amount of crown t can be easily provided on the slider surface of the floating magnetic head. In FIG. 5, the target crown amount t is 0.2 μm, the depth h of the slit is 10 to 100 (μm), and the width w is 0.2 μm.
2 to 0.6 (mm), and the distance P between each slit is 0.2 to 0.6 (mm). When manufactured, a floating magnetic head with a crown amount t of approximately 0.2 (μm) was realized. As a comparative example, a conventional floating magnetic head shown in FIG. 7 was manufactured, but it was not possible to form a crown.

[0020]

[Effects of the Invention] As described above, the present invention provides minute irregularities such as minute slits on the gimbal mounting surface without using an expensive lapping machine, and attaches the gimbal and floating magnetic head using heat-shrinkable adhesive. Since they are bonded together, a predetermined crown amount t can be easily formed on the slider surface by the bending moment caused by the contraction of the adhesive in the individual minute irregularities and the adhesive on the gimbal mounting surface. In addition, by increasing the adhesive area, the adhesive strength between the floating magnetic head and the gimbal is significantly improved, and a floating magnetic head with excellent mechanical strength and durability can be realized at a low cost and excellent in mass production. be.

[Brief explanation of drawings]

FIG. 1: (a) A perspective view of a main part of a gimbal mounting surface on which a micro slit of the present invention is formed; (b) A sectional view of a main part showing an example of a micro slit of the present invention.

[Fig. 2] A perspective view of a main part of a gimbal mounting surface formed with other minute irregularities according to the present invention.

FIG. 3 is a perspective view of the floating magnetic head of the present invention.

FIG. 4 is a side view of the floating magnetic head of the present invention.

[Fig. 5] A side view of the main part of the floating magnetic head of the present invention when it is driven.

[Fig. 6] Perspective view of a conventional floating magnetic head

[Figure 7] Side view of a conventional floating magnetic head

[Figure 8] Side view during conventional crown formation

[Explanation of symbols]

1 Magnetic circuit component 2 Floating magnetic head 3 Gimbal mounting surface 31 Uneven part consisting of minute slits 32 Micro unevenness 4 Read/write coil wire 5. Gimbal 6 Load arm 7 Insulation tube 8 Claw for fixing insulation tube 9 Crown forming part 10 Gap part 11 Adhesive 12 Rap record 13 Magnetic recording medium

Claims (1)

[Claims] Claim 1: On the gimbal mounting surface side of a floating magnetic head,
1. A floating magnetic head, characterized in that at least a gimbal mounting portion is formed with microscopic unevenness arranged in an array.