JPS649643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin plate-shaped magnetic head mainly used in a magnetic card reader.

For example, some magnetic card readers use multiple channels, in which case a multi-element multi-head has conventionally been used. However, in the case of a multi-head, if the card is deformed, each element of the magnetic head will not be able to adhere uniformly to the magnetic track of the card, making it unusable. Therefore, an independent magnetic head is provided for each channel, and each A device was developed in which each magnetic head could move independently. US Patent No.
Those described in specification No. 4028734 and Japanese Patent Application Laid-Open No. 53-39725 are examples thereof.

A magnetic head for a magnetic card reader like this, which is independent for each channel, is made in the form of a thin plate, but the manufacturing method is to separate the core holder into two parts, make them separately, and attach them to the pair of split core holders. A wire-wound core was fitted and a terminal was attached, the core holders were brought together and resin was filled and solidified in the space facing each other to form a single piece, and then post-processing such as surface grinding and polishing was carried out. was. However, in conventional magnetic heads manufactured in this way, the split core holder and the wire-wound core are integrated only by the binding force of the resin, so post-processing such as grinding and polishing is not required. There was a drawback that the core holder was easily broken at the butt part at the stage. In particular, in multi-track magnetic card readers, there is no extra space around the head and a shield case surrounding the outer surface is omitted, so ensuring mechanical strength has been a problem. In addition, conventional magnetic heads were individually assembled one by one, but since a single thin plate magnetic head is extremely small, the individual assembly work is troublesome, and it is difficult to achieve a high degree of dimensional accuracy. was extremely difficult.

An object of the present invention is to provide a magnetic head that can strengthen the binding force between split core holders after being filled with resin, and that will not break even during post-assembly processing. There is a particular thing.

Another object of the present invention is to make it possible to assemble a plurality of heads and then cut them into a single head by strengthening the binding force between the split core holders as described above. hand,
An object of the present invention is to provide a magnetic head which can be easily assembled and has a high degree of dimensional accuracy.

The present invention will be explained below with reference to illustrated embodiments. In FIGS. 1 and 2, a pair of core holders 2a and 2b are made of a non-magnetic material such as brass and are symmetrical to each other and have a substantially U-shaped planar shape, so that a predetermined space is formed between them. are placed facing each other. Window holes are formed at the center of the front ends (the upper ends in FIGS. 1 and 2) and the center of the rear ends of the pair of core holders 2a and 2b that are brought into contact with each other, and these window holes allow the front and rear ends of the core 4 to be The parts are held together. The front end surface and the rear end surface of the core 4 are shaped so as to be smoothly continuous with the front end surface and the rear end surface of the core holders 2a and 2b.
The core 4 is provided with a pair of windings 6a and 6b. Terminal holders 8a and 8b are fixed to the rear end surfaces of the pair of core holders 2a and 2b. Both ends of terminal plates 10a, 10b bent at right angles within each holder protrude from the opposing surfaces and rear end surfaces of each terminal holder 8a, 8b, and another Terminal board 1
2a and 12b protrude. Terminal board 12a, 1
2b are electrically connected by soldering. One end of the winding 6a is connected to a terminal 10a, the other end to a terminal 12a, one end of the winding 6b is connected to a terminal 10b, and the other end is connected to a terminal 12b. The space formed by the opposing pair of core holders 2a, 2b and around the terminal holders 8a, 8b is filled with resin 14 such as epoxy and solidified to form a solid magnetic head. The most distinctive feature is that wedge-shaped grooves 16a, 16b whose planar shapes expand inward are formed on the opposing inner surfaces of the pair of core holders 2a, 2b, and these grooves 16a, 16b are also filled with resin 14. is filled with. Therefore, since the resin 14 is shaped to bite into the wedge-shaped grooves 16a, 16b, the pair of core holders 2a, 2b, the core 4 with wire winding, etc. are firmly integrated, and the pair can be separated by post-processing or the like. This prevents the core holders 2a and 2b from breaking at the abutting portion. As is clear from FIG. 1, the resin 14 is designed to sandwich the rear end of the core 4 from the front and back, and then wrap it around the terminal holders 8a and 8b, thereby integrating the whole. Therefore, from this point of view as well, the structure is such that the overall mechanical strength is improved. Wedge-shaped grooves 18a, 18b are formed that extend inward from the outside of the pair of core holders 2a, 2b. One end of the leaf springs 20a, 20b is inserted into these grooves 18a, 18b, and the resin 2
By filling and solidifying 2a, 22b, the springs 20a, 20
One end of b is fixed. Leaf spring 20a, 2
The other end of the core 4 is supported by a support frame (not shown), and the entire head can be moved back and forth depending on the unevenness of the magnetic card, etc., on which the front end surface of the core 4 is to be slid, due to the elasticity of the leaf springs 20a and 20b. It's summery.

The magnetic heads of the present invention as described above may be made individually one by one, but from the standpoint of assembly processing time and improvement of accuracy, it is preferable to first assemble a plurality of heads as one unit and then to separate each head individually. It is preferable to separate them. Therefore, next, the manufacturing method will be explained. In FIG. 3, reference numeral 30a
and 30b, 32a and 32b, 34a and 34b, 3
6a and 36b, 38a and 38b each indicate a pair of core holders, and each core holder 30a, 32a, 34a, 36a, 38 on the left half
Initially, these core holders were stacked one on top of the other and were made integrally, and similarly, each core holder 30b, 32b, 34b, 3 on the right half
6b and 38b are also made integrally so that they overlap each other. Therefore, first, the core holder on the left half and the core holder on the right half, which are made integrally, are faced to each other and brought together, for example, 30a,
The portions 30b, 38a, and 38b are integrated with each other by screws or the like. Core holders 32a and 3
Since window holes into which the cores 4a, 4b, and 4c are to be fitted are formed in the opposing parts of the portions that are to become 2b, 34a and 34b, and 36a and 36b, windings are preliminarily applied to these window holes. The front end portions of the cores 4a, 4b, and 4c are fitted together. Each core 4a, 4
The rear ends of b and 4c are also core holders 32a, respectively.
and 32b, 34a and 34b, and 36a and 36b are fitted into window holes (not shown) in opposing parts. Next, as shown in FIG. 4, a terminal holder 42 in which a plurality of terminal boards 40 are integrally held is fixed to the rear end surface of the left half core holder and the right half core holder, The ends of the windings in each head element are connected to the terminal plate corresponding to each head element. Next, the space between the left and right core holders is filled with resin and solidified as shown in FIG. In this way, a solid magnetic head consisting of a plurality of head elements is formed.Next, as shown in Figure 3, each head element is sliced into thin pieces using a grindstone, hand saw, etc. It is made into a thin plate-like independent magnetic head. At this time, the terminal holder 42 also holds the adjacent terminals 40.
divided among themselves. The separated upper end portion including the core holders 30a, 30b and the lower end portion including the core holders 38a, 38b are unnecessary portions that do not constitute the magnetic head. Each magnetic head thus separated and independent is then subjected to finishing processes such as grinding and polishing until it is completed.

In this way, the manufacturing method that initially made it possible to assemble multiple magnetic heads in a combined state and then separate them later was made possible by creating grooves that widened inward on the opposing surfaces of a pair of core holders. This is based on the fact that the mutual bonding force between the pair of core holders is strengthened by filling and solidifying the resin in the opposing spaces of the pair of core holders including the grooves. According to this manufacturing method, the thickness of the head is determined at the stage of dividing into individual heads, so if the core thickness is l and the head thickness is L, the value of L approaches the value of l. becomes possible. In other words, it is possible to reduce the overall thickness of the head relative to the thickness of the core. On the other hand, when trying to manufacture each head individually from the beginning as in the past, the necessary parts must be made with a specified precision from the beginning, and since the individual parts are small, Machining parts is difficult,
If we try to bring the overall thickness L of the head closer to the core thickness l, the distance between the edge of the window hole into which the core should fit and the outer edge of the core holder becomes extremely small.
It becomes technically impossible to process. Therefore, the magnetic head of the present invention is also characterized in that it enables a novel manufacturing method that brings about unique effects.

In the example shown in FIG. 3, one of the three head elements is thicker. This shows the case where one of the thicker layers is used for recording and the two smaller ones are used for reproduction. but,
The combinations may be arbitrary, and the number of head elements initially assembled together may also be arbitrary.

In short, the grooves to be formed on the opposing surfaces of the pair of core holders only have to function as a wedge by filling and solidifying the resin, and are formed by forming a stepped portion inclined in the direction of inward expansion, as shown by reference numeral 44 in FIG. Alternatively, an inclined groove as shown at 46 in FIG. 6 may be formed.

As is clear from the above explanation, according to the present invention,
Inwardly expanding or sloping grooves or steps are formed in a pair of opposing core holders, and these grooves or steps function as a wedge when the resin is filled and solidified. The binding force becomes strong, and problems such as cracking of the head due to finishing work after assembly can be eliminated.

In addition, based on the strong binding force between the pair of core holders as mentioned above, it is possible to manufacture the core holder by initially assembling it containing multiple head elements and then separating it into individual head elements. By using such a manufacturing method, it is possible to manufacture a more compact magnetic head with high precision.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
FIG. 3 is a front view showing an example of the manufacturing method of the magnetic head of the present invention, FIG. 4 is a perspective view showing an example of the terminal holder used in the manufacturing method of the above, and FIG. FIG. 6 is a plan sectional view showing still another embodiment of the invention. 2a, 2b, 32a, 32b, 34a, 34
b, 36a, 36b... Core holder, 4, 4
a, 4b, 4c... core, 6a, 6b... winding,
8a, 8b, 42...Terminal holder, 14...Resin, 16a, 16b, 46...Groove, 44...Step portion.

Claims (1)

[Claims] 1. In a magnetic head made by fitting a wire-wound core into a split core holder and attaching a terminal to the split core holder, butting the core holders together and filling the space with resin and solidifying it, the core holder is provided with an inwardly expanding or inclined groove or step. A magnetic head that is formed in communication with the above-mentioned space, and is formed by filling and solidifying a resin into the space and the groove or step portion that communicate with each other.