JP2000076606A - Magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic head having a structure which can easily fix a shield cover temporarily and which can prescribed the head reference face in the same direction as that of a core surface. SOLUTION: The magnetic head is equipped with a magnetic head molding 10 from which the core 31 is projecting and with a shield cover 20 covering this molding. In this head, the magnetic head molding is provided with protrusions 11 which protrudes to the surface side of the core 21 and which prescribes a head reference face, and provided with plural projections 12 which protrude to the side for the purpose of temporarily fix the shield cover 20. In addition, the shield cover 20 has a through hole 21 for protruding the core 31 and a through hole 22 for protruding the protrusions 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head having a structure in which a magnetic head molded product entirely integrated with a sealed molded housing is covered with a shield cover, and more particularly, a structure for temporarily fixing the shield cover to the magnetic head molded product. The present invention relates to a magnetic head having:

[0002]

2. Description of the Related Art A magnetic head in which a main part of a magnetic head including a coil bobbin, a winding and a core is embedded in a housing (hereinafter referred to as a sealing molded housing) integrally molded with a sealing resin and a part of the core is projected. A magnetic head that has a structure in which a molded product is formed and this molded product is covered with a shield cover made of, for example, permalloy can simplify the entire assembling process as compared with the case where the main components of the magnetic head are assembled independently. become.

[0003]

However, magnetic heads using the above-mentioned molded products still have points to be improved. For example, there is a problem of how to temporarily fix the shield cover while maintaining the positional relationship between the two until the shield cover is completely fixed to the molded product. It is also important in the assembling process to determine where the reference surface of the magnetic head is to be obtained. Conventionally, the bottom surface of the molded product is used as the reference surface of the head. However, since this bottom surface is opposite to the core surface, which is the surface in contact with the magnetic recording medium, a reference surface in the same direction as the core surface is required. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head having a structure in which the shield cover can be temporarily fixed easily and a magnetic head reference surface can be defined in the same direction as the core surface.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head comprising a magnetic head molded product having a protruded core and a shield cover covering the molded product. A projection for head reference surface definition projecting toward the front surface side of the core, and a plurality of projections projecting toward the side for temporarily fixing the shield cover, wherein the shield cover includes the core This can be achieved by a magnetic head having a core through-hole for projecting the projection and a projection through-hole for projecting the projection.

The object of the present invention is also a magnetic head comprising a magnetic head molded product and a shield cover for covering the molded product, wherein the magnetic head molded product is a magnetic head comprising a coil bobbin, a winding and a core. Part, a flat base part, a central step part protruding from the center of the base part, and a pair of protrusions for defining a head reference surface protruding from both wings of the base part apart from the central step part And a plurality of projections for temporarily fixing the shield case protruding from the side wall of the base portion. The main part of the magnetic head is moved from the central step portion of the sealing molded housing to the base. A part of the core is buried over a base portion to protrude from the central step portion, and the shield cover has a base cover portion formed in a shape along the base portion and a shape along the central step portion. Formed A central cover portion, a core through hole formed in the central cover portion so as to project the core, and a pair of projecting portion through holes formed in the base cover portion so as to project the pair of projecting portions. This can be achieved with a magnetic head having holes.

According to an embodiment of the present invention, the shield cover is made of a permalloy material. Further, the core is a laminated core in which soft magnetic layers and non-magnetic layers are alternately laminated, and a gap portion is formed at the center. Furthermore,
An earth lug is interposed between the molded product and the shield cover, and the earth lug contacts both the shield cover and the core.

According to the present invention, since the magnetic head molded product has a plurality of projections for temporarily fixing the shield cover projecting toward the side, the temporary fixation of the shield cover can be easily performed. Further, since the magnetic head molded product has the protrusion for defining the head reference surface projecting toward the surface of the core, the magnetic head reference surface can be defined in the same direction as the core surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 is an assembled side view showing an embodiment of the present invention. In this figure, 10
Denotes a magnetic head molded product having the core 31 protruded, and 20 denotes a shield cover that covers the molded product 10. The magnetic head molded product 10 includes a projection 11 for defining a head reference surface projecting toward the surface of the core 31 and a plurality of projections 12 projecting toward the side for temporarily fixing the shield cover 20. Have. The shield cover 20 has a core through hole 21 for projecting the core 31 and a projecting portion through hole 22 for projecting the projecting portion 11.

[0010] More specifically, the molded magnetic head 10 comprises a coil bobbin 32 shown in FIG.
The main part 30 of the magnetic head, which is composed of the winding 33 wound around, the two terminal pins 34 for drawing out the ends of the winding 33 to the outside, and the core 31 described above, is housed in the sealed housing 13. The housing 13 has a flat base portion 13A.
And a central step 13 protruding from the center of the base 13A.
B, and protruding portions 11, 11 for defining the above-mentioned head reference plane from both wing portions of the base portion 13A apart from the central step portion 13B.
Is projected.

From the side wall of the base portion 13A, a plurality of projections 1 (four in total in the present embodiment) for temporarily fixing the shield case are provided.
2 is projected. Main part 3 of magnetic head shown in FIG.
Numeral 0 is embedded from the central step 13B of the sealing molded housing 13 to the base 13A, and a part of the core 31 projects from the central step 13B.

The shield cover 20 corresponding to the housing 13 having such a shape includes a base cover portion 20A formed along the base portion 13A and a central cover portion formed along the central step portion 13B. 20B and the core 3
The above-mentioned core through-hole 21 for projecting the center cover portion 2
The base cover 20A is formed with the pair of protrusion through holes 22, 22 formed in the base cover 20A and formed on the base cover 20A. Reference numeral 23 denotes a cutout for drawing out the terminal pin 34 to the outside.

Hereinafter, a more specific configuration of the magnetic head of FIG. 1 will be described with reference to FIGS. 2 is a plan view of the magnetic head, FIG. 3 is a bottom view, FIG. 4 is a partially cutaway side view, and FIG. 5 is a side sectional view. Since the shield cover 20 has a structure that covers only the front side of the magnetic head molded product 10, the open bottom side is closed by the back shield plate 35. The shield cover 20 is formed of a permalloy material. The core 31 of the present example is a laminated core in which soft magnetic layers and non-magnetic layers are alternately laminated, and a gap 3
1A is formed. Molded product 10 and shield cover 2
As shown in FIG. 5, an earth lug 36 is interposed between the shield cover 10 and the core 31 as shown in FIG. Reference numeral 37 denotes a joining spring for pressing the ground lug 36 against the core 31.

According to the present invention, since the magnetic head molded product 10 has the plurality of projections 12 for temporarily fixing the shield cover protruding toward the side, the temporary fixing of the shield cover 20 can be easily performed. In addition, the magnetic head molded product 10
Has a protruding portion 11 for defining a head reference surface protruding toward the surface side of the core 31. By using the top surface of the protruding portion 11 as a head reference surface, the head Can be specified. That is, the height of the top surface of the protrusion 11 is in a certain positional relationship with the bottom of the base 13A.

[0015]

As described above, according to the present invention, there is provided a magnetic head having such a structure that the shield cover can be easily fixed temporarily and the magnetic head reference plane can be defined in the same direction as the core surface. be able to.

[Brief description of the drawings]

FIG. 1 is an assembled side view showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is a plan view after assembling the magnetic head of FIG. 1;

FIG. 3 is a bottom view after assembling the magnetic head of FIG. 1;

FIG. 4 is a partially cutaway side view after assembling the magnetic head of FIG. 1;

FIG. 5 is a sectional side view after assembling the magnetic head of FIG. 1;

FIG. 6 is a front view of a main part of the magnetic head.

[Explanation of symbols]

 Reference Signs List 10 Magnetic head molded product 11 Projection for defining head reference surface 12 Projection for temporary fixing of shield cover 13 Sealing molded housing 13A Base 13B Center step 20 Shield cover 20A Base cover 20B Central cover 21 Core penetration Hole 22 Protruding part through hole 30 Main part of magnetic head 31 Core 31A Gap part 32 Coil bobbin 33 Winding 34 Terminal pin 35 Back shield plate 36 Earth lug

Claims (5)

[Claims] A magnetic head molded product having a core protruded;
A magnetic head including a shield cover that covers the molded product, wherein the magnetic head molded product is configured to temporarily fix the shield cover and a protrusion for defining a head reference surface protruding toward the surface side of the core. A plurality of protrusions protruding toward a side portion, wherein the shield cover has a core through hole for projecting the core, and a projection through hole for projecting the projection. head. 2. A magnetic head comprising a magnetic head molded product and a shield cover for covering the molded product, wherein the magnetic head molded product comprises: a main part of a magnetic head comprising a coil bobbin, a winding and a core; A sealed molded housing having a base, a central step protruding from the center of the base, and a pair of protruding parts for defining a head reference surface protruding from both wings of the base away from the central step. And a plurality of projections for temporarily fixing the shield case protruding from the side wall of the base portion, wherein the main part of the magnetic head is buried from the central step portion of the sealing molded housing to the base portion. A part of the core protrudes from the central step, the shield cover includes a base cover formed in a shape along the base, and a center cover formed in a shape along the central step. When A core through hole formed in the central cover portion so as to project the core; and a pair of projecting portion through holes formed in the base cover portion so as to project the pair of projecting portions. Characteristic magnetic head. 3. The magnetic head according to claim 1, wherein the shield cover is formed of a permalloy material. 4. The magnetic head according to claim 1, wherein the core is a laminated core in which soft magnetic layers and non-magnetic layers are alternately laminated, and a gap is formed at the center. 5. The magnetic head according to claim 1, wherein an earth lug is interposed between the molded product and the shield cover, and the earth lug contacts both the shield cover and the core. .