JPS6338408Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a resin filling structure in which a magnetic head element is housed and filled in a shield case, and is mainly used for banknote identification.

Conventional magnetic heads for banknote discrimination are manufactured in the same way as general magnetic heads. An example of this is shown in FIGS. 1 and 2. Figure 1 shows a magnetic head element, with a straight line of a symmetrical core 1 consisting of a front abutting part 2 with a sloped base and a thinner tip, a straight part 3 and a rear abutting part 4 bent at almost a right angle. Winding wire 5 is wound around part 3 with insulating tape, and magnetic gap material 7 is sandwiched between front abutting parts 2 and abutted against each other.
Screws 8 are passed through both holders 6 from opposite directions and are tightened and fixed. FIG. 2 is a cross-sectional view of the completed magnetic head, in which the magnetic head element is placed in a shield case 9, an arc-shaped leaf spring 10 is inserted between the outer wall of the holder 6 and the inner wall of the case 9, the holder 6 is supported, and the rear Filling resin 11 from the butt part 4 side, for example, epoxy compound resin for casting and lamination (specification R-
138/H-89), and the terminal plate 12 is placed on the opening surface of the case 9.

The magnetic head with this configuration has the drawback that vibrations generated when a banknote passes through the magnetic head are transmitted to the winding 5, causing sliding noise and malfunction.

In order to eliminate such drawbacks, the present invention aims to provide a magnetic head that can suppress vibrations transmitted to the windings and prevent the generation of noise as much as possible.

In this invention, two opposing holders that hold a ring-shaped magnetic head with a magnetic gap material sandwiched between the front abutting parts from the left and right sides are tightened and fixed with screws, stored in a shield case, and placed inside the case. In a ring-shaped magnetic head that is filled with resin and fixed, a resin with high adhesive strength is filled near the front abutting part, and the other parts are filled with resin with low adhesive strength for impregnation or casting. It is characterized by

A sectional view of an embodiment of the present invention is shown in FIG.

Two symmetrical cores 1 with windings 5 are arranged in a ring shape with a magnetic gap material 7 interposed between the front abutting portions 2, and are held from the left and right by two holders 6, and screws are inserted in opposite directions. The magnetic head element, which has been tightened and fixed through the core 1, is housed in a shield case 9 with arc-shaped leaf springs 10 applied to the left and right sides of the magnetic head element, and a filled resin 1 having high adhesive strength is applied from the side of the rear abutment part 4 of the core 1.
3 For example, cover the front abutment part 2 with an epoxy resin containing the product name Epicoat specification #815 and Epomate B-002 in a predetermined ratio, fill it to an extent that it does not reach the winding 5, harden it, and then apply the above-mentioned note. The mold/laminating resin is additionally filled above the two-dot chain line a-a in the figure, and the terminal plate 12 is applied and fixed.

The mechanical properties of typical cured products of the exemplified resins are as follows: Resin ^{13 has a shear adhesive strength of 222 Kg/cm 2 while} Resin 11 has a tensile strength of 7.3. Kg/mm ² while the latter is 3 to 3.5 Kg/mm.

Since the front abutment part is firmly and firmly held by the resin with high adhesive strength, the proportion of vibrations caused by banknotes being transmitted to the windings is reduced, and the noise, which was previously around 0.5V, has been reduced to 0.3V.

Note that if the winding portion is filled with a resin having a high adhesive strength, fluctuations in electrical characteristics will increase and this is not practical.

Also, since the winding wire is extremely thin at 0.03φ, there is a risk of wire breakage.

As described above, according to the present invention, noise caused by vibrations caused by the passage of banknotes is significantly reduced, and it is extremely effective in preventing malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing the magnetic head element;
FIG. 2 is a side sectional view showing the structure of a conventional magnetic head, and FIG. 3 is a side sectional view showing an embodiment of the present invention. In the figure, 1...Core, 2...Front butt portion, 4...Rear butt portion, 5...Winding, 6...Holder, 7...Magnetic gap material, 8...Screw, 9...
Shield case, 10...Plate spring, 11...Filled resin, 12...Terminal plate, 13...Filled resin having high adhesive strength.

Claims (1)

[Claims for Utility Model Registration] A magnetic head core configured in a ring shape with a magnetic gap material interposed in the front abutting portion is fixed from the left and right with holders, and this is housed in a shield case, and a resin is placed in the case. A ring-shaped magnetic head filled with a ring-shaped magnetic head, characterized in that the vicinity of the front abutting portion is filled with a filling resin having high adhesive strength, and the other portions are filled with a resin having low adhesive strength. .