JPS6364834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head, and more particularly to a method of manufacturing a magnetic head in which a plurality of thin plates are assembled by welding.

FIG. 1a shows a magnetic head assembly in which two magnetic heads 1 are mounted. This magnetic head assembly has multiple magnetic heads 1
, a flexible printed circuit section 5 that transmits data read or written by the magnetic head 1, and an amplifier 6 that amplifies these data.
, a connector 7 provided at one end of the flexible printed circuit section 5, and a holding plate 8 on which each of these components is mounted. The magnetic head assembly constructed in this manner is provided at a position for accessing the magnetic disk 2 in the disk pack 100 in a magnetic disk storage device, as shown in FIG. 2, for example.

The magnetic head 1, as shown in FIG. 1b, is composed of a gimbal assembly section 4 and a core slider 3 mounted on one end of the assembly section 4.

This disk-type magnetic head has many different shapes depending on the storage capacity, but the assembly section 4 that holds the core slider 3 is used in common for all magnetic heads. 3 to 5 show details of the assembly section 4, FIG. 3 shows the components of the assembly section, FIG. 4 shows the assembled state, and FIG. 5 shows the assembled state of FIG. 4.
Shows the state seen from the viewing direction. First, referring to FIG. 3, the gimbal assembly section 4 is composed of a gimbal 9, a load arm 13, and a spacer 16. The gimbal 9 has a plate thickness of 50 μm, has a spring part 10, and has holes 11 and 12 in the longitudinal direction. I have it too. Load arm 1
3 is a complicated press-molded part that includes a groove 14, a central protrusion 37, protrusions 15 at both ends, and a vane-shaped part 3.
6. The spacer 16 is a machined product and has a round boss portion 17. These parts are assembled integrally as shown in Fig. 4, and high accuracy of ±20 μm or less is required despite the complex shape of the thin plate parts. FIG. 5 is a view of FIG. 4 viewed from the direction of the arrow.

Incidentally, these parts are joined by welding at 14 locations shown as welding portions 18 in FIG. 5.

Conventionally, the magnetic head 1 has been assembled using a precision jig shown in FIG. In this jig, a gimbal holding frame 37 that holds a gimbal 9 precisely positioned on a gimbal sheet 36 is arranged on a base 101 on which a load arm 13 and a spacer 16 are positioned, and an electrode 38 for resistance welding is placed on the base 101 on which a load arm 13 and a spacer 16 are positioned. Therefore, the welded portion 18 (see FIG. 5) is welded and assembled. Such conventional techniques have the following problems.

Magnetic heads are no exception to the recent trend toward automation of assembly work, and various efforts are being made.However, when automating assembly parts, conventional resistance welding requires frequent electrode correction, which causes welding dust. There are problems such as difficulty in removal. Therefore, there is an urgent need to develop a non-contact welding method.

On the other hand, in the case of non-contact laser welding, etc.
If there is a gap between welded parts at the welding point, only the upper part will be melted and a hole will be formed. For this reason, an ultra-thin plate (50μ
There is the problem of how to make the gimbal (m) adhere to the mating parts (spacer, load arm) at all of the multiple welding points without any gaps.

The purpose of the present invention is to eliminate the problems of the prior art described above, and it is possible to perform non-contact welding such as laser welding by pressing the gimbal, which is a thin plate (for example, 50 μm), with the mating part (spacer, load arm) without any gaps. It is an object of the present invention to provide a method for manufacturing a magnetic head that can produce magnetic heads.

In order to achieve this object, the present invention includes a step of positioning a load arm on the leaf spring portion of the gimbal, a step of positioning a spacer at the other end of the gimbal, and a step of positioning the spacer and gimbal in a hollow laser irradiation hole. a step of bringing the leaf spring into close contact with the load arm by pressing the center of the leaf spring and deforming the leaf spring along the shape of the load arm; It is characterized by comprising a step of laser welding the parts.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIGS. 6 to 14 are diagrams for explaining a close-clamp jig for precision positioning used in the method of manufacturing a magnetic head according to the present invention.

FIG. 6 is an overall external view showing a close-contact clamp jig which is an embodiment of the present invention.

The clamp jig shown in FIG.
A spacer pedestal 20 and a load arm pedestal 21 having a stepped portion 38 in the center are fixed on the top, and the spacer lateral pushing piece 22 and the load arm lateral pushing piece 23 are configured to slide on the jig base 19. has been done. In addition, after assembling and positioning the three parts of the gimbal 9, spacer 16, and load arm 13, the close clamp arm 26 for tightly clamping them can be pivoted about the pivot support 27 attached to the jig base 19 as a fulcrum. It's summery.

Further, a leaf spring 28 and a clamp piece 29 are attached to the close contact clamp arm 26, and a hole 30 through which a laser beam passes is formed. Further, the clamp piece 29 is supported so as to be able to rotate by a minute amount relative to the close clamp arm 26.

Incidentally, the jig base 19 and the spacer pedestal 20 are attached with a shim pin 24 and a positioning pin 25 for positioning the gimbal.

Figure 7 shows the load arm 1 attached to the clamp jig.
3 and a spacer 16 are positioned. FIG. In FIG. 7, after the load arm 13 is aligned with the center portion 38 of the load arm pedestal 21 using the load arm groove 14 as a reference, the load arm blade portion 36 is inserted into the load arm side pushing piece 2.
3, the spacer pedestal 20 is pressed by
It is positioned at a position where it comes into contact with. The load arm 13 is positioned by driving the load arm side pushing piece 23 in this manner.

The spacer 16 to be positioned is
After the spacer round boss portion 17 of No. 6 is attached to the groove portion 39 of the spacer pedestal 20, the spacer horizontal push piece 22
By being pressed in the direction of the load arm 13 by the load arm 13, positioning is achieved.

FIG. 8 shows a state in which the gimbal 9 is mounted on the clamp jig in which the load arm 13 and the spacer 16 are positioned in this manner. In the figure, the gimbal 9 is positioned by pushing the gimbal tip hole 12 into the shim pin 24 and by the positioning pin 25 attached to the spacer pedestal 20.

FIG. 9 is a diagram showing a state in which three parts are aligned with the clamping jig shown in FIG. 6 and tightly clamped. In the figure, a plate spring 28 is attached to a tight clamp arm 26 for the purpose of preventing displacement during gimbal clamping, and the plate spring 28 is attached to the gimbal spring part 10 and the clamp piece 2.
9, the gimbal tip hole 12 is pushed into the Sizumi pin 24 by the tip of the leaf spring 28, and the gimbal 9 is fixed by the spring force of the Sizumi pin up/down spring 31 and the spring force of the leaf spring 28. . After fixing the gimbal 9 with the leaf spring 28, load arm 13
and gimbal spring part 10 which is the joint part of gimbal 9.
is pushed in with the clamp piece 29, and then the gimbal portion corresponding to the welded portion with the spacer 16 is pushed in by the pushing piece 32 incorporated in the tight clamp arm 26, completing tight clamping of the three parts.

FIG. 10 is a partially enlarged view showing details of the close clamping state of the welding point between the gimbal 9 and the spacer 16. Push pieces 32 are independently assembled into the tight clamp arm 26 in a number corresponding to the welding points, and the welding points are locally pressurized by the push springs 33.
The gimbal 9 and the spacer 16 are arranged in close contact with each other. Note that the pusher piece 32 is hollow and welding is performed by irradiating a laser through this hole. The pusher piece 32 slides in the vertical direction in the drawing, and may be made of any material as long as it is easily slidable.

11 to 13 are diagrams for explaining the variations in the press-formed shape of the load arm 13 with respect to the welding points between the gimbal spring part 10 and the load arm 13. FIG. In this case, the protrusions 15 at both ends and the central protrusion 37 remain on the same plane, and the three protrusions 15 and 37 of the gimbal spring part 10 and the load arm 13 are in close contact with each other with high precision, so that good laser welding is possible at the welding part 18. It is done in.

However, as shown in FIGS. 12 and 13, if the planar state of the protrusions 15 at both ends of the load arm 13 and the central protrusion 37 are deformed, the protrusions 15 and 37 do not come into close contact with the gimbal spring part 10. Bad welding occurs.

Now, the close contact between the gimbal spring section 10 and the load arm 13 in this embodiment is as shown in FIG.
This is realized by a central portion 34 protruding from the center of the clamp piece 29 and a central stepped portion 38 of the load arm holder 21. That is, the central portion 34 of the clamp piece 29
This is achieved by pressing the gimbal spring part 10 and the center part 37 of the load arm 13, so that the extremely thin gimbal spring part 10 follows the shape of the load arm 13 and is forcibly displaced by a minute amount.
In this way, attach the gimbal spring 10 to the load arm 1.
Since laser welding is performed through the hole 30 made in the clamp piece 29 while the clamp piece 29 is closely attached to the shape of 3, there may be some changes in the planar relationship between the three protrusions 15 and 37 of the load arm 13 and the gimbal spring part 10. Even if there is a gap, this can be corrected to achieve good welding.

As described above, in the present invention, laser welding can be performed with the load arm 13 and the gimbal spring part 10 in close contact with each other, so it is possible to provide a highly reliable magnetic head with good joining accuracy. can.

[Brief explanation of drawings]

Figures 1a and 1b are views showing the magnetic head assembly and the magnetic head, Figure 2 is a view showing a disk pack equipped with the magnetic head, Figure 3 is an exploded view of the magnetic head, and Figure 4 is a view showing the magnetic head. FIG. 5 is a bottom view and a top view of the magnetic head. FIG. 6 is a diagram showing a close clamping jig which is an embodiment of the method for manufacturing a magnetic head according to the present invention, and FIG. 7 is a diagram showing a state in which the load arm and spacer are positioned in the close clamping jig shown in FIG. 6. A partially enlarged view showing
FIG. 8 is a partially enlarged view showing the gimbal placed on the contact jig shown in FIG. 7. Figure 9 shows the 6th
10 is a sectional view showing a load arm, a spacer, and a gimbal mounted on the tight clamping jig shown in the figure; FIGS. 10 and 14 are views showing the tight clamping state according to the present invention; FIGS. 11 to 13 FIG. 3 is a diagram showing a clamped state of the load arm and the gimbal spring section. FIG. 15 is a diagram showing a method of manufacturing a magnetic head according to the prior art. Explanation of symbols: 1... Magnetic head, 2... Magnetic disk, 3... Core slider, 4... Gimbal assembly section, 5... Flexible printed circuit section, 6... Amplifier (IC), 7... Connector, 8...Retaining plate, 9
...Gimbal, 10...Gimbal spring part, 11 and 12...Gimbal hole part, 13...Load arm, 15...Both end projections of load arm, 17...
...Spacer boss part, 19...Jig base, 20...
...Spacer cradle, 21...Load arm cradle, 2
2... Spacer side push piece, 23... Load arm side push piece, 24... Shizumi pin, 25... Alignment pin, 26... Close clamp arm, 27...
Swivel support, 28...Plate spring, 29...Clamp piece, 31...Spring for Sizumi pin, 32...Press piece, 33...Press spring, 34...Clamp piece center portion (protrusion), 30, 35... ...Laser irradiation hole, 3
6...Load arm blade portion, 37...Load arm center protrusion, 38...Load arm cradle center portion (stepped portion).

Claims (1)

[Scope of Claims] 1. A gimbal having a core slider mounted on one end and having a leaf spring portion having elastic properties, a load arm connected to the leaf spring portion of the gimbal and pressing the core slider, and the gimbal. A method for manufacturing a magnetic head comprising a spacer connected to the other end includes: a load arm pedestal having a load arm mount having a center portion recessed from both ends; and a spacer pedestal on which the spacer is placed. a jig base, a push piece rotatably supported at an end of the jig base and pressed by an elastic member, and a clamp piece having a protrusion on a portion facing the center of the load arm holder. A clamp jig is prepared, the load arm is placed on the load arm pedestal at a position where it will be welded to the leaf spring portion of the gimbal, and the spacer is placed on the spacer pedestal so that the gimbal is welded to the load arm. Place the gimbal at a position where it will be welded to the other end, place the gimbal on the load arm and the spacer, rotate the clamp arm, and bring the other end of the gimbal and the spacer into close contact with the push piece; The protruding portion of the clamp piece presses the leaf spring portion of the gimbal and the center portion of the load arm to deform the load arm, thereby bringing the leaf spring portion of the gimbal into close contact with the load arm, and in this state, the gimbal 1. A method of manufacturing a magnetic head, characterized in that the end of the head is welded to a spacer, and the plate spring portion of a gimbal and a load arm are welded together by laser irradiation.