JP2524451Y2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a magnetic head used for a magnetic card reader or the like.

[Prior Art] Conventionally, in order to form a gap between magnetic cores in a magnetic head, a magnetic core is bonded to a core holder, a magnetic gap material is sandwiched between the cores, and the cores are then butted together by a tightening screw. The method of fixing the holders was adopted. FIG. 3 is a perspective view showing such a conventional magnetic head. In this figure, C-shaped magnetic cores 1 and 2 provided with windings 3 and 4, respectively, are fixed to holders 6 and 7, respectively, by an adhesive. A magnetic gap 5 is formed at the leading end portions of the two magnetic cores 1 and 2 with a spacer such as a titanium foil interposed therebetween. The clamping screws 8a and 8b clamp the holders 6 and 7 covering the magnetic cores 1 and 2 together to maintain the formation of the magnetic gap 5 described above.

[Problems to be solved by the invention]

However, such a conventional magnetic head has a holder 6.
Since the screws 8a and 8b are tightened with the two screws 8a and 8b, the screws 8a and 8b must be turned through the holes of the holders 6 and 7, and the workability is poor and not suitable for mass production. Furthermore, if the two screws are not tightly balanced, the holders 6 and 7 will deform and the butts will not be uniform, resulting in uneven magnetic gap formation and inability to stabilize performance. .

[Means for solving the problem]

According to the present invention, a magnetic field is formed by forming a pair of two C-shaped magnetic cores, each of which is provided with a winding, and a magnetic gap formed on one of abutting surfaces of the magnetic cores with a magnetic gap material interposed therebetween. In the head, two grooves are provided on an outer wide surface of each of the two magnetic cores so as to be paired with each other with the winding portion interposed therebetween, and one of these grooves has a first U-shape. The legs of the holder are inserted, and the legs of the second U-shaped holder are inserted into the other pair of grooves, whereby the shape of the magnetic gap is determined.

[Example of the invention]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing the structure of the embodiment of the present invention. In this figure, 11 and 12 are C-shaped magnetic cores, 13 and 14 are windings, 15 is a magnetic gap, and 16 and 17 are U-shaped holders. As can be seen, the magnetic cores 11 and 12, on which the windings 13 and 14 are wound, respectively, have grooves 11a, 11a,
11b and 12a, 12b are formed respectively.

At the time of assembling, first, the C-shaped magnetic cores 11 and 12 on which the windings 13 and 14 are wound are abutted with each other, and a magnetic gap 15 is formed at the tip of the magnetic core by sandwiching a spacer such as a titanium foil. Next, insert both leg portions of the U-shaped holder 16 into the grooves 11a and 12a on the gap side of the two magnetic cores,
The two leg portions of another U-shaped holder 17 are inserted into the other pair of grooves 11b and 12b. Since the inner space between the legs of each holder is made to match the distance between the grooves of the two butted magnetic cores in advance, the two magnetic cores are properly butted by the insertion of the holder and the magnetic gap 15 Is maintained stably.

The magnetic core thus assembled is housed in a magnetic shield case 18 as shown in FIG.
It is fixed by resin. The outer surface in the vicinity of the magnetic gap 15 is polished in an arc shape and finished. The U-shaped holder 17 also serves as a terminal plate, and pin terminals are implanted vertically outward.

[Effect of the invention]

As is apparent from the above description, according to the present invention, 2
The two magnetic cores are provided with two pairs of grooves on the outer wide surface of each of the two magnetic cores, and two U-shaped holders are inserted into each pair of grooves. Since the magnetic gap is stably maintained, the effect is great in that not only easy assembling and uniform performance can be obtained, but also productivity can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the structure of an embodiment according to the present invention,
2 is a side view showing the magnetic core assembled in FIG. 1 partially cut away in a state housed in a case, and FIG. 3 is a perspective view showing a structural example of a conventional magnetic head. In the figure, 11 and 12 are magnetic cores, 13 and 14 are windings, 15 is a magnetic gap, 16 and 17 are U-shaped holders, and 18 is a magnetic shield case.

Claims (1)

(57) [Scope of request for utility model registration] A pair of two C-shaped magnetic cores are provided with windings on their body portions, and a magnetic gap is formed on one of the butting surfaces of the magnetic cores with a magnetic gap material interposed therebetween. In the magnetic head, two pairs of grooves are provided on the outer wide surface of each of the two magnetic cores so as to sandwich each other with the winding portion interposed therebetween.
A magnetic head characterized in that the legs of the U-shaped holder are inserted into the other U-shaped holder, and the legs of the second U-shaped holder are inserted into the other pair of grooves.