JPS6118246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a core for configuring a magnetic circuit by closely contacting the upper and lower surfaces of a shield plate made by covering the upper and lower surfaces of a magnetic plate with non-magnetic plates, and in this state, the shield plate and the core are This invention relates to a multi-type magnetic head in which a desired magnetic gap is created by cutting a spacer insertion groove from the front surface and then inserting a spacer into the insertion groove.

In forming such a head, the dotted line portion 500 in Figure 1 of the shield plate is cut when forming the spacer insertion groove, and pressure is applied in the direction of the arrow with the spacer sandwiched between the shield plates, and the shield plate is fixed in this state. will be done.

However, if only cutting is used to form the spacer insertion groove, the above fixation is not reliable because after the pressure in the direction of the arrow is released, the shield plate itself has a force that returns in the opposite direction to the arrow due to its own elasticity. There is a problem.

Therefore, if a cut groove such as 100 in FIG. 1 is provided at the same time as the shield plate is formed, the returning force can be reduced, but this cut groove 100 also has the disadvantage of reducing the shielding effect.

The present invention provides a magnetic head which can eliminate this drawback and which can be easily fixed to a shield case, and will be described below with reference to the embodiments shown in FIGS. 2 to 5.

Here, FIG. 2 mainly shows the relationship between a shielding plate 3 consisting of a magnetic plate 1 and a non-magnetic plate 2 covering its upper and lower surfaces, and a core 6 for forming a magnetic circuit formed by cores 4 and 5 on its upper surface. This is what is shown. In addition,
When forming a multi-channel head, it goes without saying that the cores 6 are provided above and below the shield plate 3, but the relationship between the cores on the lower surface of the shield plate 3 is omitted for ease of explanation.

In addition, the magnetic plate 1 is provided with a substantially “H”-shaped cut groove 11 on one side edge, and the non-magnetic plate 2 is formed with a cut groove 22 similar to the above-mentioned cut groove 11 and a winding hole 21 at the same time. are doing. 7 is a side core made of a non-magnetic material. In this case, one magnetic circuit forming core 6 is a stack of two cores 4 and three cores 5, and due to the difference in shape of both cores 4 and 5, the end 61 of the core 4 protrudes. Moreover, this part is in a floating state with respect to the shield plate 3. Further, as shown in FIG. 5, the shield plate 3 is provided with recesses 700 on both side edges of the rear end portion to form weldable portions 702 and 703.

In the above configuration, when forming the spacer insertion groove 9 to sandwich the spacer 8, the spacer insertion groove 9 and the cut grooves 11, 22 provided in the shield plate 3
The relationship between the two is such that they are joined at each other's ends as shown in FIG.

Therefore, when pressure is applied in the direction of the arrow as shown in FIG. 3 to sandwich the spacer 8, one of the tips of the shield plate 3 will move in the other direction with point a as the fulcrum.

Next, the relationship between the kerfs 11 and 22 and the windings will be explained. 10 is the back core part, back core 3
1 and a portion 3 for winding the winding wire 32 shown in FIG.
3. A bobbin 36 having a hole 35 into which the terminal 34 and the end 61 of the magnetic circuit core 6 are attached.
A terminal 34 is provided on a part of the bobbin 36.
A recess 37 is provided to expose a portion of the base side of the holder. The winding 32 can also be held in this recess 37.
The electrical connection between the terminal 34 and the terminal 34 is established. The winding 3
2 and the overhang hole 21, as shown in FIG. 4, so that a large number of windings can be obtained.

In addition, the cut groove 1 provided on the winding 32 and the shield plate 3
1 and 22, since the grooves 11 and 22 are provided so as to escape the winding 32, the shielding effect is not impaired.

As explained above from the aspect of the manufacturing process, the above structure can contribute to holding the spacer 8 without impairing the shielding effect of the shield plate 3. Also, by moving the back core part 10 along the shield plate 3, one magnetic circuit forming core 6 and the back core 3 are connected.
1, assembly is easy.

Further, the winding 3 is placed in the recess 37 of the bobbin 36.
2 and the terminal, this joint part does not protrude compared to other parts,
The upper surface of the bobbin 36 is a shield case (not shown)
It can be easily used to determine the distance between
Furthermore, the shield plate 3 consisting of the magnetic plate 1 and the non-magnetic plate 2 is provided with an approximately “H”-shaped cut groove [one-sided cut groove] 1.
1 and 22 are provided, and by means of the spacer insertion groove 9, only one of the tips of the shield plate 3 (i.e., Since the amount of protrusion of the Y portion remains unchanged, this portion can be used as a reference surface, which helps improve head assembly accuracy.

Furthermore, as shown in FIG.
Therefore, when this shield plate 3 is adapted to the shield case 701, the weldable parts 702, 703 can be easily welded to the shield case 701.

As explained above, according to the present invention, by providing the shield plate with a cut groove for escaping the winding portion and forming a gap groove together with a groove for inserting a spacer, head assembly accuracy can be improved and the shielding effect can be improved without impairing the shielding effect. Can hold spacers. Further, by providing a weldable portion to the shield case on one end of the shield plate, there is an advantage that the shield plate can be easily connected to the shield case.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a shield plate, FIG. 2 is a manufacturing process diagram for explaining a magnetic head according to an embodiment of the present invention, and FIGS. FIG. 3 is a perspective view, a sectional view, and a plan view of the main parts of the parts used. 3... Shield plate, 6... Core for magnetic circuit configuration, 9... Groove for spacer insertion, 11, 22... Cut groove, 21... Winding escape hole, 32... Winding wire, 700
... recess, 701 ... shield case, 702,
703...Weldable part.

Claims (1)

[Claims] 1. Cores for forming a magnetic circuit are closely attached to the upper and lower surfaces of a shield plate whose outer surface is a non-magnetic layer, and a weldable part to the shield case is provided on both sides of one end of the shield plate, and a spacer is attached to this shield plate. Along with the insertion groove, a substantially V-shaped cut groove is provided along one end edge of the shield plate, and an end of the spacer insertion groove and one end of the cut groove are connected to each other. A magnetic head characterized in that a winding escape hole is provided in a part of a nonmagnetic layer.