JPH0542046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic head, and more particularly to a magnetic head in which a magnetic core for recording and reproducing information on a magnetic recording medium is fitted and fixed within a case.

[Prior art]

A conventional positioning structure for the magnetic core of this type of magnetic head will be explained with reference to FIG.

In the figure, what is indicated by the reference numeral 1 is a magnetic core, and the core halves 1a, 1a are approximately "U" shaped.
A pair of core halves 1a, 1a are abutted and joined together via a magnetic gap G, and a reinforcing plate 2 for reinforcing and supporting the abutment of the core halves 1a, 1a is joined to the upper surface of the intermediate portion. Also magnetic core 1
A bobbin 3 is located at the rear end facing the magnetic gap G.
A winding coil 5 is wound around this bobbin 3, and terminal conductors 4, 4 connected to this winding coil 4 are implanted.

A core support 6, which is a support, is fitted to one side or both sides of the magnetic core assembly constructed as described above, as shown in the figure, to form a magnetic head element 7. Ru.

Then, this magnetic head element 7 is similarly press-fitted and fitted into a case (not shown) together with a plate spring (not shown), and in this case, the core support 6 is pressed against the inner surface of the case by the elastic force of the plate spring and positioned. By doing so, the magnetic core 1 is positioned.

After this positioning, the entire magnetic head element 7 is fixed by a method such as filling the case with a fixing resin.

However, the structure in which the magnetic core 1 is positioned and fixed in this manner requires one or two core supports 6 and a leaf spring, and has the disadvantage that the manufacturing cost is high due to the large number of parts and the large number of assembly steps. It was hot.

〔the purpose〕

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional magnetic head, and it is possible to reduce the number of parts and assembly man-hours in a magnetic head in which a magnetic core is fitted and fixed in a case, and is equivalent to the conventional one. The object of the present invention is to provide a magnetic head that can position a magnetic core with the above precision.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below with reference to FIG. 2 and subsequent drawings. In each figure, the first
The same or corresponding parts as in the figures are given the same reference numerals.

What is shown in FIG. 2 is a reinforcing plate 8, and in this embodiment, this reinforcing plate 8 is joined to both upper and lower surfaces of each of the core halves 1a, 1a that constitute the magnetic core 1, as shown in FIG. There is.

As shown in both figures, the reinforcing plate 8 has a bent shape substantially similar to the core half 1a, and when joined as shown in FIG. 1a, but the width of the intermediate portion 8b is larger than the width of the same portion of the core half 1a, and its outer end protrudes from the outer edge of the core half 1a. It is formed to do so.

The magnetic core 1 is constructed by abutting and joining core halves 1a, 1a with such reinforcing plates 8 joined to the upper and lower surfaces via a magnetic gap G. A winding coil 5 similar to the conventional one is wound around the rear end of this magnetic core 1, terminal conductors 4, 4 are implanted, and a bobbin 3 is fitted to form a magnetic core assembly 9.
is configured.

This magnetic core assembly 9 is then fitted into a case 10 shown in FIG.

The front surface of this case 10 is formed as a sliding surface 10a that slides on a magnetic recording medium (not shown), and this sliding surface 10a is formed with an opening 10b through which the magnetic gap G of the magnetic core 1 is exposed. . Case 1 adjacent to both left and right sides of the sliding surface 10a in the figure
A convex portion 10c that protrudes inwardly is formed on both inner surfaces of the case 1, as shown by the recesses on the outer surface shown in the figure.
The sliding surface 1 is placed from the rear edge of the back side of the case 10 at a position corresponding in height to the opening 10b on the inner surface of the case 10.
It is formed to extend to the vicinity of 0a. Further, the width in the vertical direction of the convex portion 10c on the inner surface (not shown) is approximately equal to the thickness dimension of the core half body 1a, that is, the dimension between the upper and lower reinforcing plates 8, 8.

In addition, the dimension between the inner surfaces of the case 10 having the convex portion 10c is approximately equal to the dimension between the outer edges of the intermediate portions 8b, 8b of the pair of upper and lower reinforcing plates 8, 8 that are butted against each other. It is configured.

FIG. 5 shows a state in which the magnetic core assembly 9 in the above configuration is fitted into the case 10.

In this case, as shown in the figure, the magnetic core assembly 9
Upper and lower reinforcing plates 8, 8 intermediate portions 8b on both left and right sides of
The outer end of 8b engages with the upper and lower portions of the convex portions 10c, 10c on both sides, and clamps them.

As a result, the magnetic core assembly 9 is supported between the protrusions 10c and 10c via the reinforcing plate 8, and due to the dimensional relationship between the reinforcing plate 8 and the case 10 described above, the magnetic core assembly 9 is supported in the vertical and horizontal directions in FIG. It is positioned in the track width direction and the track extension direction. That is, the magnetic core 1 is positioned in the aforementioned direction. In this state, the magnetic core assembly 9 has convex portions 10c and 10.
c and is inserted into the case 10 to a predetermined position, so that the magnetic gap G at the tip faces the opening 10b of the sliding surface 10a.

Thereafter, the magnetic core assembly 9 is fixed by a method such as filling the case 10 with a fixing resin.

According to the positioning structure of the magnetic core 1 according to the present embodiment as described above, positioning is performed only through the engagement structure of the reinforcing plate 8 and the convex portion 10c, without using the conventional core support 6, leaf spring, etc. Therefore, the number of parts of the magnetic head is reduced, and the number of assembly steps is also reduced.

Further, according to this embodiment, the positioning accuracy of the magnetic core 1 is determined by the dimensional relationship between the reinforcing plate 8 and the case 10 including the convex portion 10c described above. Since both the reinforcing plate 8 and the case 10 have simple structures and can easily achieve high dimensional accuracy, the above-mentioned positioning can be performed with an accuracy equal to or higher than that of the conventional case.

Note that the shape, structure, and number of reinforcing plates 8 are not limited to those described above, and other reinforcing members may be used.

Effects As is clear from the above description, according to the present invention, the magnetic core is fitted and fixed in the case, and the tip end of the magnetic core is inserted into the opening provided in the magnetic recording medium sliding surface of the case. In the magnetic head facing the magnetic core, reinforcing members protruding from the outer edge of the magnetic core are joined on both sides of the magnetic core, and a pair of protruding parts of the reinforcing member connects the protrusion provided on the inner surface of the case. We adopted a structure in which the magnetic core is positioned in the track width direction by clamping and fixing it, reducing the number of parts and assembly man-hours, and is an excellent magnetic head that can position the magnetic core with accuracy equal to or higher than conventional ones. can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head element body illustrating a conventional magnetic core positioning structure of a magnetic head, and FIG. 2 and the following illustrate embodiments of the present invention. FIG. 3 is a perspective view of the magnetic core assembly, FIG. 4 is a perspective view of the case, and FIG. 5 is a rear view showing the magnetic core assembly fitted into the case. DESCRIPTION OF SYMBOLS 1... Magnetic core, 1a... Core half, 3... Bobbin, 4... Terminal conductor, 5... Winding coil, 8...
...Reinforcement plate, 8a...Tip part, 8b...Middle part, 8
c... Rear end portion, 9... Magnetic core assembly, 10...
Case, 10c...Protrusion.

Claims (1)

[Scope of Claims] 1. 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, both sides of the magnetic core are provided. The reinforcing member protruding from the outer edge of the magnetic core is joined to the reinforcing member, and the pair of protruding portions of the reinforcing member sandwich and fix the convex portion provided on the inner surface of the case, thereby fixing the magnetic core. A magnetic head characterized by positioning in the track width direction.