JPS6118247B2 - - 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 front surface to form a spacer insertion groove 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 like 100 in FIG. 1 is provided at the same time as the shield plate is formed, the returning force can be reduced, but there is a drawback that even the cut groove 100 reduces the shielding effect.

The present invention provides a magnetic head that can eliminate this drawback and also securely fix the spacer, and will be described below with reference to embodiments shown in FIGS. 2 to 4.

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. It shows the 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 provided with a cut groove 22 similar to the above-mentioned cut groove 11 and a winding part undercut hole 21 at the same time. are doing. A side core 7 is made of a non-magnetic material and has a hole 71 formed in a part thereof. In this case, one magnetic circuit forming core 6 includes two cores 4 and three cores 5.
Both cores are 4 and 5 cores.
Because of the difference in shape, the end 61 of the core 4 protrudes,
Moreover, this part is in a floating state with respect to the shield plate 3.

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. Further, the hole 71 is located in the formation path of the spacer insertion groove 9, and is formed to have a diameter larger than the width of the insertion groove 9.

Next, the relationship between the kerfs 11 and 22 and the windings will be explained.

10 is a back core part, with back core 31,
A portion 33 for winding the winding 32 shown in FIG. 4, a terminal 34, and an end portion 61 of the core 6 for forming a magnetic circuit.
A bobbin 36 has a hole 35 into which the terminal 34 is attached, and a recess 37 is provided in a part of the bobbin 36 to expose a part of the base side of the terminal 34. This recess 37 also provides electrical connection between the winding 32 and the terminal 34. The relationship between the windings 32 and the winding holes 21 is designed so that the number of windings can be increased as shown in FIG.

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, along with the shield plate 3, the back core part 1
Since the core 6 for configuring the magnetic circuit and the back core 31 can be connected by moving the magnetic circuit core 6, assembly is easy.

Further, the winding 3 is placed in the recess 37 of the bobbin 36.
2 and the terminal 34, this joint part does not protrude compared to other parts, and the upper surface of the bobbin 36 is used to determine the distance from the shield case (not shown). Easy to use. Furthermore, the shield plate 3 made up of the magnetic plate 1 and the non-magnetic plate 2 is provided with approximately “F”-shaped cut grooves (one-sided cut grooves) 11 and 22, and the shield plate 3 is formed by the spacer insertion groove 9. One of the tips (i.e. X)
Since only the head is moved in the Y direction using part a as a fulcrum to form the required gap, the amount of protrusion of the Y part does not change. Therefore, this part can be used as a reference surface and the accuracy of head assembly can be improved. It has the effect of helping to improve.

In addition, since the side core 7 provided on the upper surface of the magnetic circuit forming core 6 is provided with a hole 71,
It also has the advantage that it can be used as an air escape hole when filling adhesive with the spacer 8 sandwiched therebetween, improving adhesion accuracy.

As explained above, according to the present invention, by providing the shield plate with a cut groove that allows the winding portion to escape and forms a gap groove with the spacer insertion groove, head assembly precision is improved and the shielding effect is impaired. The spacer can be held without any problems. In addition, a hole is provided in the side core provided on the upper surface of the core for forming a magnetic circuit, and this hole is used as an air escape hole when filled with adhesive with a spacer sandwiched therebetween, thereby improving adhesion accuracy.

[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. 3 and 4 are main parts of one of the parts used in the magnetic head. FIG. 2 is a perspective view and a cross-sectional view. 3... Shield plate, 6... Core for magnetic circuit configuration, 7... Side core, 9... Groove for spacer insertion, 10... Back core portion, 11, 22... Cut groove, 71... Hole.

Claims (1)

[Claims] 1 Cores for configuring a magnetic circuit are provided on the upper and lower surfaces of a shield plate whose outer surface is a non-magnetic layer, a side core is provided on the outer surface of the core, an air escape hole is provided in the center of the side core, and the shield A substantially V-shaped cut groove is provided in the plate along one end edge of the shield plate along with a spacer insertion groove having a width narrower than the diameter of the air escape hole that crosses the air escape hole, and an end of the spacer insertion groove is provided in the plate. A magnetic head, characterized in that a part and one end of the kerf are connected to each other.