JP2673511B2 - Method for manufacturing shield plate for magnetic head - Google Patents

Description

The present invention relates to a method for manufacturing a shield plate for a magnetic head,
In particular, it relates to a method for manufacturing a shield plate that shields between magnetic cores of a magnetic head. [Prior Art] In a magnetic head having a plurality of magnetic cores around which a coil is wound, a shield plate is arranged between the magnetic cores and the coils in order to magnetically shield each other. In order to shield the magnetic cores from each other and to avoid direct contact with the shielded magnetic cores, this shield plate is conventionally provided on both sides of the magnetic metal material 31, as shown in FIG. Are bonded together with an adhesive or the like. More specifically, in this conventional shield plate, a shield plate portion made of the magnetic metal material 31 and a nonmagnetic plate portion made of the nonmagnetic metal materials 32 and 33 are separately formed by pressing, and then these are arranged on a jig. It was manufactured integrally by adhering with an adhesive material. [Problems to be Solved by the Invention] In the conventional method for manufacturing a shield plate for a magnetic head described above, the nonmagnetic metal materials 32 and 33 are bonded to both surfaces of the magnetic metal material 31 with an adhesive or the like to form a shield plate. Therefore, there is a problem in that a shift due to bonding is likely to occur. Further, since the three plate members are bonded together, the thickness of the shield plate becomes large, which makes it difficult to secure a coil space in the magnetic head. Further, since the laminating is performed after the press working, there is a problem that the number of parts increases and the working man-hour increases. The present invention has been made in view of the above, and an object thereof is to manufacture a shield plate for a magnetic head that can easily secure a required space with a small number of parts and a small number of processing steps. It is to provide a manufacturing method of. [Means for Solving Problems] In order to solve the above problems, a method of manufacturing a shield plate for a magnetic head according to the present invention includes a long magnetic metal material and a long non-magnetic metal material bonded to both surfaces of the magnetic metal material. To form an integrated long laminated material, a step of crushing the coil space portion by pressing the long laminated material at predetermined intervals, and the crushed long laminated material. To form a shield plate by punching so as to cut at a position corresponding to the shield plate dimension length. The terms “coil space portion” and “shield plate dimension length corresponding position” are described in the section “Example” described later. [Operation] In the method for producing a shield plate for a magnetic head of the present invention, a long non-magnetic metal material is joined to both surfaces of a long magnetic metal material to form an integrated long laminated material. The coil space is crushed by pressing a long laminated material at predetermined intervals, and the crushed long laminated material is pressed to punch the shield plate so that it is cut at a position corresponding to the shield plate dimension length. Form. EXAMPLES The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a magnetic head shield plate 1 manufactured by a manufacturing method according to an embodiment of the present invention. This shield plate 1 is thinly formed by crushing only the central portion by press working after non-magnetic metal materials 3 and 4 such as nickel silver material are welded or pressure-bonded to both sides of a magnetic metal material 2 such as permalloy. The part is formed without being crushed and remains thick. In the method of manufacturing a shield plate for a magnetic head according to the present embodiment for manufacturing such a shield plate 1, first, as shown in FIG. 2, the same long non-magnetic metal material 3 is provided on both sides of the long magnetic metal material 2. And 4 are arranged, and these are welded or pressure-bonded to form a laminated material. Next, as shown in FIG. 3, the laminated material is crushed by pressing at a predetermined interval at a portion corresponding to the thin central portion of the shield plate 1 (this portion is referred to as a "coil space portion"), and the thickness is reduced. Form thin parts intermittently. Subsequently, the crushed laminated material is cut at a non-crushed position indicated by alternate long and short dash lines A and A'by press working (this position is referred to as "shield plate dimension length corresponding position"), as shown in FIG. A large number of shield plates 1 are formed at the same time. By forming the shield plate 1 from the laminated material in this manner, the work of laminating and fixing the magnetic metal material 31 and the non-magnetic metal materials 32 and 33 unlike the conventional shield plate shown in FIG. 5 is unnecessary. Becomes 4 (a) and 4 (b) are a cross-sectional view of a magnetic head provided with the shield plate 1 shown in FIG. 1 and the other cross-sectional view orthogonal to the cross-section. This magnetic head is entirely covered with a shield case 5 as in a normal magnetic head, and four magnetic cores 6 to 9 are provided therein. One end of each of these magnetic cores 6 to 9 serves as a magnetic recording medium. It is exposed on the sliding surface 10 of. A coil 11 is provided on a horizontal base of each of the magnetic cores 6 to 9 extending inward from the sliding contact surface 10 via a coil bobbin.
~ 14 are each wound. Both ends of the coil bobbin extend downward, and terminals 15 to 18 for making electrical connection with the outside are fixed to the extending portion, and the leads of the ends of the coils 11 to 14 are fixed to these terminals 15 to 18. Wires are connected. Between the magnetic cores 6-9, shield plates 19, 20, 21 extend from the sliding contact surface 10 through the coils 11-14 to near the terminals 15-18 to shield the magnetic cores 6-9. It is arranged to do. Of the shield plates 19 to 21, the shield plate 20 at the center thereof is the shield plate 1 shown in FIG.
Is used, and the middle portion thereof is formed thinner than the upper end portion, the lower end portion and the rear end portion (in FIG. 4 (b)). And this thinly formed shield plate 20
The coils 12 and 13 are arranged on both sides of the intermediate part of the magnetic cores 7 and 8 and the shield plate 20 due to the thinness of the shield plate 20.
The space between and becomes wider, and the coils 12, 13 wound a predetermined number of times are housed in this widened space. The shield plate 1 is thickly formed at the upper end portion, the lower end portion, and the rear end portion. However, when the upper end portion is disposed between the magnetic cores 7 and 8 on the sliding contact surface 10 side, the magnetic core 7 This is to prevent the resin poured in for fixing the magnetic head constituent member in the shield case 5 from flowing out from the sliding contact surface 10 by eliminating the gap between the magnetic head and the member 8, 8. Further, the lower end and the rear end are also made thicker so as to correspond to the upper end in order to prevent the shield plate 20 from inclining when setting the shield plate 20 as a jig and to prevent a decrease in work. is there. Since the magnetic metal material 2 and the non-magnetic metal materials 3 and 4 are not separately formed as in the conventional case in the shield plate 1 manufactured in this manner, the magnetic metal material 2 and the non-magnetic metal materials 3 and 4 are cured. The step of positioning and pasting with a tool is unnecessary, and the number of parts is small and the manufacturing is simple. [Advantages of the Invention] As described above, according to the present invention, the laminated plate is crushed by press working at predetermined intervals, and then punched by press working to form the shield plate. effective. There will be no deviation due to pasting as in the past. Since the central portion of the manufactured shield plate is formed thin, the coil space can be easily secured. The number of parts is reduced compared to the conventional one, and cost design becomes advantageous. The time required for the machining process of parts can be greatly reduced, and the lead time can be greatly reduced. Since there is no laminating step, the shield plate can be used immediately after press working, which is advantageous for automatic assembly. Crushing and punching can be performed by one press device, these operations can be performed continuously without dead time, the manufacturing lead time can be shortened, and mass productivity is improved. Further, by performing crushing and punching continuously with a press, stable processing accuracy can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic head shield plate manufactured by a manufacturing method according to an embodiment of the present invention, and FIG. 2 shows one step of manufacturing the shield plate of FIG. FIG. 3 is a cross-sectional view showing another process for manufacturing the shield plate of FIG. 1, and FIGS. 4 (a) and 4 (b) are cross-sections of a magnetic head provided with the shield plate of FIG. FIG. 5 is an exploded perspective view showing one step of a conventional method for manufacturing a magnetic head shield plate. In the figure, 1 ... shield plate, 2 ... magnetic metal material, 3,4 ... non-magnetic metal material, 5 ... shield case, 6-9 ... magnetic core, 11-14 ... coil, 15-18 ...... Terminal, 20 …… Shield plate.

Claims (1)

(57) [Claims] By joining a long non-magnetic metal material on both sides of a long magnetic metal material to form an integrated long laminated material, and pressing the long laminated material at predetermined intervals A step of crushing the coil space part, and a step of punching the crushed long laminated material so as to cut it at a position corresponding to a shield plate dimension length by press working to form a shield plate. Manufacturing method of shield plate for magnetic head.