JPS618705A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head having high track position precision by pressing a reinforcing member, which is joined to a magnetic core, onto the side edge of an aperture part to fix this member. CONSTITUTION:An aperture part 7b formed on a slide surface 7a of a shield case 7 is formed into a downward projecting shape, and the center part in the lower side of the figure is formed as a recessed part 7c which a front end part 1a of a magnetic core 1 should face, and lower edge parts in both sides of this recessed part are formed as shoulder parts 7d and 7e onto which reinforcing plates 8 should be pressed. Reinforcing plates 8 and 8 are joined on upper faces in the figure of core half bodies 2 and 2 of the magnetic core 1 in the state where their front edges coincide with front ends of core half boides 2 and 2, and reinforcing plates 8 and 8 are formed into the U shape, and they are butted in accordance with joined core half bodies 2 and 2, and a coil winding 3 is provided in the rear end part of the magnetic core 1, and a coil bobbin 6 on which connection terminals 4 and 4 are stood is fitted to the magnetic core 1, and the magnetic core 1 provided with reinforcing plates 8 and 8 and the coil bobbin 5 is incorporated in the shield case 7.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head, and more particularly, the present invention relates to a magnetic head, and more particularly, a magnetic core is fitted into a case, and the magnetic core is inserted into an opening provided in a magnetic recording medium sliding surface of the fixed location case. This invention relates to a magnetic head whose tip is exposed.

[Prior art]

The conventional structure of this type of magnetic head will be explained with reference to FIGS. 1 and 2.

FIG. 1 is an exploded perspective view of the magnetic head. In the figure, the reference numeral 1 indicates the above-mentioned magnetic core, which is constructed by joining a pair of core half-holes 2.2 against each other with a magnetic gap G interposed therebetween. A coil bobbin 5 on which a one-turn coil 3 is wound and terminal conductors 4, 4 are implanted is fitted onto the opposite side of the magnetic gap G of the magnetic core I. Further, a core support 6.6 is fitted into each of the core halves 2, 2 of the magnetic core 1 and are joined to butt against each other, thereby supporting the magnetic core 1.

Additionally, there are four parts 6a on the upper surface of the core support 6.6 in the figure.

6a is formed, and a plate spring (not shown) is fitted into the recesses 6a, 6a.

The assembly of the magnetic core 1 and the core support 5.5 having the above configuration is fitted into a shield case 7, and as shown in FIG. However, the opening 7b formed in the magnetic recording medium sliding surface (hereinafter abbreviated as sliding surface) 7a of the shield case 7
will be faced.

Here, the above-mentioned fitting is performed by connecting the above-mentioned plate pie (not shown) to the inner surface of the shield case 7 and the recess 6a of the core support 6.6.
This is done by bending it between it and the bottom surface of 6a. Therefore, after fitting, the core supports 6, 6 are pressed against the inner surface of the lower side in the figure of the shield case 7 due to the elastic force of the leaf springs, and the core supports 6, 6 are positioned by this pressure, so that the magnetic core l The magnetic core 1 is positioned and faces the opening 7b.
tracks are positioned.

After this fitting, the above-described assembly including the magnetic core 1 is fixed by a method such as filling the shield case 7 with resin (not shown).

By the way, according to the configuration in which the track is positioned as described above, the track position accuracy is determined by the magnetic core 1. The dimensional relationship numbers of each part of the core support 6.6 and shield case 7 are determined by the following, so in order to increase the track position accuracy, it is necessary to increase the dimensional accuracy of each of the above parts, and also to improve the shape of each part. , it is necessary to make the structure complex in consideration of the above-mentioned dimensional relationships.

However, due to the improvement in component precision and the complexity of the shape and structure, the number of man-hours in the manufacturing process increases, resulting in high costs.

〔the purpose〕

The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic head that can obtain high track position accuracy with a simple and inexpensive structure.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings from FIG. 3 onwards. Note that O in each figure indicates Figures 1 and 2.
The same reference numerals are given to the same or corresponding parts as in the figures.

FIG. 3 shows the shield case 7 of the magnetic head according to this embodiment.
This shows the structure of

As shown in the figure, in the case of the shield case 7 of this embodiment,
The opening 7b formed in the sliding surface 7a is formed in a convex shape with the top and bottom reversed in the figure, and the lower center part in the figure is a four part 7c that faces the tip 1a of the magnetic core 1, which will be described later. The lower edges on both sides of these four parts are formed as shoulder parts 7d and 7e on which a reinforcing plate to be described later is pressed.

Next, FIGS. 4(a) to 4(C) show the structure of an assembly of the magnetic core I and the members attached thereto.

As shown in these figures, the magnetic core 1 is constructed by butt-joining core halves 2, 2 with a magnetic gap G in between, as in the conventional example described above, and a tip portion 1a provided with the magnetic gap G. stands out.

The whole is formed into a substantially "convex" shape.

Reinforcing plates 8, 8 are joined to the upper surfaces of the core halves 2, 2 of the magnetic core 1, with their front edges aligned with the tips of the core halves 2, 2. The reinforcing plates 8, 8 are formed in a substantially "U" shape, and are butted against each other and joined in correspondence with the joined core halves 2, 2. The width dimension in the vertical direction in FIG. 4(c) of the front edges of the butted reinforcing plates 8, 8 is larger than the width dimension of the tip portion 1a of the magnetic core 1, and the front edge portion is on the inside and outside of the tip portion 1a. It's sticking out.

Further, a coil bobbin 5, which is wound with a coil winding 3 and has connection terminals 4, 4 implanted therein, is fitted into the rear end portion of the magnetic core 1, as in the conventional example.

The magnetic core 1 to which the reinforcing plates 8, 8 and the coil bobbin 5 are attached as described above is assembled into the shield case 7 as shown in FIG.

That is, as shown in FIG. 5, the tip 1a of the magnetic core l fitted in the shield case 7 faces the four parts 7C of the opening 7b of the sliding surface 7a, and also faces the front side of the reinforcing plates 8, 8. The edges are fitted onto both shoulders 7d and Ve of the opening 7b. Then, the reinforcing plates 8, 8 are pressed against the upper pins of both shoulders 7d, 7e and fixed by the elastic force of the leaf spring 9 interposed between the upper surface of the reinforcing plates 8, 8 and the upper edge of the opening 7b.

As a result, the reinforcing plates 8, 8 are positioned on both shoulders 7d, 7e in the vertical direction in the figure. Furthermore, as shown in the same figure, the width of the front edges of the reinforcing plates 8, 8 and the width of the entire opening part 7b into which they are fitted are equal, so that the reinforcing plates 8, 8
The horizontal position in the figure is also determined according to the position of the opening 7b. Therefore, the tip portion 1a of the magnetic core 1 joined to the reinforcing plates 8, 8 is positioned, and the position of the magnetic gap G, that is, the track position is determined.

After the above fitting, magnetic core 1. The entire assembly of reinforcing plates 8, 8 and coil bobbin 5 is fixed.

According to the configuration of this embodiment as described above, the track position accuracy is determined by the dimensional accuracy of only the reinforcing plates 8, 8 and the shield case 7. The reinforcing plates 8, 8 and the shield case 7 are simple in shape and structure.

High dimensional accuracy can be obtained without increasing the number of steps.

Further, according to this embodiment, since the track position accuracy can be easily obtained as described above, a structure in which the magnetic cores are individually butted together becomes possible, and the conventional core support can be omitted.

Furthermore, even if a core support is used, the structure can be made simpler than before, and there is no need to tighten the accuracy of the parts. Furthermore, the structure of the magnetic core can be simplified, and there is no need to tighten the precision of its components.

The number of manufacturing steps will be reduced.

Of course, the shape and structure of the reinforcing plate, the shape and structure of the shield case including the opening, and the configuration of the members that press the reinforcing plate are not limited to those described above. The above-mentioned effects can be obtained by positioning the track of the magnetic core by pressing and fixing the reinforcing member on the side edge of the opening of the shield case.

〔effect〕

As is clear from the above description, according to the magnetic head of the present invention, the track of the magnetic core is fixed by pressing the reinforcing member bonded to the magnetic core onto the side edge of the opening of the sliding surface of the case. Since the structure is for positioning, the structure is simplified and can be manufactured at low cost with fewer steps than conventional ones, and high track position accuracy can be obtained.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view illustrating the structure of a conventional magnetic head, Figure 2 is a perspective view of a magnetic core assembled into the shield case shown in Figure 1, and Figures 3 and below are detailed explanations of the present invention. Figure 3 is a perspective view of the shield case, Figure 4 (a) is a front view of the magnetic core and reinforcing plate, Figure 4 (b), (
c) is a side view and a plan view of an assembly consisting of a magnetic core, a reinforcing plate, and a coil bobbin, respectively, and FIG. 5 is a front view of the sliding surface side of the assembly assembled in a shield case. ■...Magnetic core Ia...Tip a'・
... Core half 5 ... Coil bobbin 7 ...
- Shield case 7a...Magnetic recording medium sliding surface 7b...Opening 7C-°° recess 7d,
7e... Shoulder 8... Reinforcement plate 9... Leaf spring G... Magnetic gap Figure 3 Figure 4 (Q) Figure 4 (b) Figure 5 Figure 4 (C)

Claims (1)

[Claims] In a magnetic head in which a magnetic core is fitted and fixed in a case and the tip of the magnetic core is exposed to an opening provided on the magnetic recording medium sliding surface of the case, a reinforcing member bonded to the magnetic core is inserted into the opening. A magnetic head, characterized in that the track of the magnetic core is positioned by pressing and fixing it onto the side edge of the magnetic head.