JPS629Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic head, and an object of the present invention is to provide a magnetic head that can be easily positioned and fixed by pressingly positioning a core in a core holder and press-fitting the core holder into a shield case. purpose.

In a conventional magnetic head, in order to position a core holder in a shield case, for example, as shown in FIG. At least two threaded screws 4 press the holder halves 2a and 2b against the other side wall of the case 3 to join the core 1 and the holder 2, respectively, and at the same time ground the holder 2 and the case 3. However, according to this, since the holder 2 (2a, 2b) itself cannot be integrated, the case 3
However, handling and positioning of the holder 2 is troublesome and there are problems with workability, and the holder halves 2a and 2b may be misaligned with each other. When the filling resin hardens, the magnetic permeability μ and gap of core 1 may change, which may affect the performance, and case 3 has the disadvantage that it requires tapping in at least two places, which increases the cost. .

As another conventional example, as shown in FIG. 2, holder halves 5a and 5b each have core halves 1a and 1b.
The core 1 and There was a method in which the holders 5 were bonded to each other, but since the above-mentioned positioning was unstable with this method, the holders were temporarily fixed with instant adhesive 7 as shown in the satin pattern in the figure before filling with resin. It is necessary to connect the ground between the case 3 and the holder 5 using the conductive paint 8, which has the disadvantage that the work is troublesome and the cost is high.

Further, in each of the above conventional examples, the core 1 (1a, 1b) is connected to the holder 2 (2a, 2b), 5 (5a, 5b), respectively.
Since the core storage recess is fitted into the core storage recess and then fixed with adhesive, the core storage recess requires dimensional accuracy, which makes processing, etc. troublesome, and the assembly work, which requires adhesive, is also troublesome. It was hot.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

3 and 4 are an assembled perspective view and an exploded perspective view, respectively, of one embodiment of the magnetic head according to the present invention. In the figure, reference numeral 21 denotes a core holder, which is integrally molded with both side walls 23 and 24 and front and rear frame parts 24 and 25 by, for example, zinc die casting.
A recess 26 serving as a first recess for storing a core 28, which will be described later, is formed in the center. The recess 26 has inner surfaces 22a and 23a on the side walls 22 and 23, respectively, and as shown in FIGS.
2, 23 and a U-shaped bottom part 22 on the front frame part 24.
b, 23b, and 24a, respectively. Also, both side walls 2
Projections 22c and 23c as projecting plastically deformable parts are integrally formed on the upper parts of 2 and 23, respectively, and a thin wall is formed at a predetermined position near the inner surface 23a of the side wall 23 between the inner surface 23a and the inner surface 23a. It has a thin wall portion 23d as a plastically deformable portion, and a hole 23e for receiving the second recess is formed. Further, a protrusion 27 is formed on the upper surface of the front frame portion 24 for uniform curing of the resin, which will be described later.

28 is a laminate core, with core halves 28a, 2
Consists of 8b. Each of the core halves 28a, 28b is made by laminating thin permalloy plates, and the manufacturing method is to first polish the joint surfaces individually, and then attach a gap to the front joint surface of one of the core halves 28a, 28b. Vapor deposition is performed to a predetermined thickness for formation.
Next, with the core halves 28a and 28b assembled and held facing each other while a coil terminal 29 (to be described later) is assembled to the rear part of the core, the holder 21 is inserted as shown in FIGS. 3 and 5.
U-shaped bottom portions 22b, 23b, 2 in the recess 26 of
Place and store on 4a. As a result, the gap 30 is formed in the core 28 by the above-mentioned vapor deposition, and
As shown in FIG. 5, the protrusion 27 of the holder 21 is loosely fitted in the recess 26 with a gap in the width direction, and is close to the front inner side of the core 28 shown in FIG.

The coil terminal 29 is a coil bobbin 31 made of resin.
A pair of metal terminals 32 are integrally molded into the bobbin 31, and both ends of a coil 33 wound around the bobbin 31 are connected to each terminal 32.
The rear part of the core 28 is inserted into the core 28.

34 is a pin as a deformation regulating member, and as shown in FIGS. 4 and 5, sloped portions 34a, 3
4b is bent into an arc shape, and is driven and press-fitted into the hole 23e of the holder 21. As a result, as shown in FIGS. 6A and 6B, the thin portion 23d is deformed toward the center of the recess 26 and comes into contact with the core halves 28a and 28b, pressing them against the inner surface 22a of the other side wall 22. By determining this, the core 28 (28a, 28b) is formed.

According to this, the core 28 is connected to the recess 26 of the holder 21.
The recess 26 can be stored and placed loosely in advance.
It is easy to manufacture as there is no need for width dimension accuracy, and the work of press-fitting the caulking pin 34 is extremely easy compared to the work of adhesively fixing the core 28 with an adhesive or the like.

Reference numeral 35 denotes a case made of magnetic metal, which has a window hole 35b in its front part 35a, and semicircular protrusions 36 at the rear end thereof are integrally formed on the inner surfaces of both side walls. The core 28 and coil terminal 29 are inserted into the case 35 from the rear of the case, but at this time, the seventh
As shown in FIG. 8, the pair of protrusions 22c and 23c of the holder 21 are in contact with the pair of protrusions 36 of the case 35, and the protrusions 36 are pressed and deformed due to the difference in hardness between them. The holder 21 is forcibly slid into the lower edge of the holder 21, and the front side of the holder 21 comes into contact with the case front part 35a. Thus, the holder 21 (core 28, coil terminal 29) has the protrusion 22c,
The gap 30 of the core 28 is firmly positioned by the pressing deformation of the core 23c, and the gap 30 of the core 28 peeks out from the window hole 35b of the case front part 35a.

In this case, the lower surface of the holder 21 is pressed into surface contact with the lower surface of the case 35 and is completely grounded, making it unnecessary to apply conductive paint for ground connection. Next, the case 35 is filled with epoxy resin (not shown) to hold and fix each of the above-mentioned parts 21, 28, 29, and finally, the case front part 35a and the part of the core 28 near the gap 30 are simultaneously polished and finished. The magnetic head is completed. Furthermore, since the protrusion 27 is located near the gap 30 of the core 28 during resin filling to reduce the thickness of the resin layer in contact with the gap 30, the gap 30 is subject to adverse effects such as deformation when the resin hardens. Never.

9A and 9B show another embodiment of the magnetic head of the present invention. In the figure, the shield case 41 is not subjected to any processing for positioning the holder, and the holder 42 has a pair of protrusions 42a integrally formed on its upper surface.

The holder 42 has the same structure as the holder 21 shown in FIG. 4, except that a pair of protrusions 42a are provided in place of the protrusions 22c and 23c. be.

The holder 42 to which the core is fixed is slid into the case 41 from the rear of the case 41 in the same manner as described above. By this slide insertion, the pair of protrusions 4
2a is successively pressed and deformed by the upper plate portion of the case 41, and is press-fitted and positioned and fixed at the innermost slide position.

As described above, according to the magnetic head of the present invention, the core accommodated in the first recess of the holder is press-fitted with the deformation regulating member into the second recess of the holder, thereby plastically deforming the thin-walled plastically deformable portion. Since the core is fixed by being pressed into the first recess, the core is positioned and fixed in the holder without play, improving assembly accuracy, and the core only needs to be loosely inserted into the first recess in advance. Therefore, the accuracy of the first recess may be rough,
It is easy to manufacture, no adhesive is required, and the assembly work is facilitated.Also, since the holder with the core is press-fitted into the shield case with plastic deformation of the protruding plastic deformation part, conventionally, for example, the holder The temporary fixing work is no longer required, and no other special positioning work is required, making the assembly work even easier and reducing the number of assembly steps. Because the surface is in pressure contact with the inner surface of the shield case, the shield case and holder can be completely grounded, and there is no need to use conductive paint, which further reduces man-hours and costs. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a conventional example of a magnetic head, Fig. 2 is a partially cutaway plan view of another conventional example of a magnetic head, and Figs. Assembly and exploded perspective view of one embodiment of the head, No. 5
The figure is a front view of the main part of the magnetic head in front of the holder, Figures 6A and B are front and plan views of the main part after the holder, respectively, and Figures 7 and 8 are respectively of the magnetic head. 9A and 9B are a longitudinal sectional view and a partially cutaway front view showing the holder assembled state of another embodiment of the magnetic head of the present invention, respectively. 1, 28...core, 1a, 1b, 28a, 28
b... Core half, 2, 5, 21... Holder, 2
a, 2b, 5a, 5b... Holder half, 3... Case, 4... Screw, 6... Spring plate, 22, 23...
...Holder side wall, 22a, 23a... Holder inner surface, 23d... Thin wall part, 23e... Hole for hole, 2
6...Holder recess, 29...Coil terminal, 30...
...gap, 34...pin, 34a, 34b
...Slope section.

Claims (1)

[Claims for Utility Model Registration] A shield case, a first recess for storing a core, a projecting plastically deformable portion integrally protruding from one side, and a portion near one inner surface of the first recess. The holder further includes a thin plastically deformable portion formed relative to the provided second recess, and is fixed within the shield case, and the holder is fixed within the first recess of the holder. The core is pressed by the thin-walled plastically deformable portion that is plastically deformed by press-fitting the deformation regulating member into the second recess, and is pushed into the first recess of the holder. and the holder to which the core is fixed is inserted into the shield case while pressing and plastically deforming the projecting plastically deformable part, and the holder is inserted into the shield case opposite to the surface on which the projecting plastically deformable part is protruded. A magnetic head having a configuration in which a side surface is pressed into surface contact with an inner surface of the shield case and is positioned and fixed within the shield case.