JPH0240564Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring-type magnetic head, and more particularly to an improvement in a connection structure for leading a coil lead from a core holder inside a case to the outside.

In this type of magnetic head, a core holder is formed in a pair of butt-connected split cases, and a plurality of approximately U-shaped split cores each having a coil wound therein are fitted into the core holders. The split cores are abutted to form a magnetic gap between the abutting surfaces. To draw the leads of each coil out of the case, connect the pin terminals of the external connection pin terminal board provided on the side of the case to the lead terminals drawn out from the core holder using covered lead wires with sufficient length. I try to pull it out.

However, since the connection between the multiple covered lead wires connected to the lead terminals of the coil using ultra-fine wires and the pin terminals of the pin terminal board for external connection is made after the split cases are butt-connected, each of the multiple covered lead wires is It is troublesome to check which coil it comes from. Therefore, before butting and connecting the divided cases, it is necessary to attach a number tag or the like to the connection end of the covered lead wire to prevent incorrect connection. When making a connection, you have to check the number while making the connection, which is troublesome. Moreover, the wiring of the covered lead wire at this time may cause a wire breakage in the coil lead, and there is a drawback that cases where there is a wire breakage or incorrect connection must be disassembled and inspected again.

The present invention aims to provide a ring-shaped magnetic head that eliminates the above drawbacks by improving the connection structure between the lead terminal of the coil led out from the core holder and the pin terminal of the pin terminal board for external connection. The present invention is characterized in that the lead terminal of the coil and the pin terminal of the external connection pin terminal board are connected via a printed circuit board.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the mounting structure of one of the split cases before butt connection as an intermediate assembly, and FIG. 2 shows the structure after butt connection and before attaching an external connection pin terminal plate to the assembly.

In FIG. 1, this divided case 1 includes a core holder 12 formed by a front end wall 14, a part of a side wall, and a partition wall 11, and a core holder 12 formed by a front end wall 14', a part of a side wall, and a partition wall 11'. 12', and the other spaces are lead extraction parts 13 and 1.
It is used as 3'. Lead drawer part 13,1
There is a partition wall 16 between 3', but a part of it is 161
It is notched as shown. Further, the side wall of the divided case on the side of the lead pull-out portion 13 is partially cut out as shown by 17, so as to be able to connect to an external circuit as described later.

The core holders 12 and 12' have a similar structure,
The core holder 12 will be explained with reference to FIG. 3. A plurality of substantially U-shaped split cores 2 each having a coil 20 wound thereon are fitted into a plurality of sets of positioning grooves 15 formed in the partition wall 11 and the front end wall 14 . The coil 20 has a red coated lead wire 3 connected to its winding start lead terminal, and a white coated lead wire 3 connected to its winding end lead terminal, and is drawn out into the lead draw-out part 13 through a through hole 111 provided in the partition wall 11. Further, a shield plate 4 is inserted between each coil, and the core holder space after housing the split core 2 around which the coil is wound is filled with an embedding resin.

In the lead extraction parts 13, 13', the partition wall 1
A printed circuit board 5' having a size extending from the partition wall 11' to the notch part 17 of the side wall of the divided case is fixed through the notch part 161 of the partition wall 11 on top of the printed board 5'.
A printed circuit board 5 having a size extending from to the notch 17 is fixed. On these printed circuit boards 5, 5', conductors 51, 51' are formed in a number corresponding to the number of covered lead wires 3, 3' from the coils passed through the through holes of the partition walls 11, 11'. Among the ends of these conductors 51, 51', the partition wall 11,
Covered lead wires 3, 3' from each coil are connected by soldering to the inner end corresponding to 11'. Also,
A predetermined length of red and white coated lead wires 6, 6' is connected to the red and white coated lead wires 3, 3' at the outer end corresponding to the notch 17 among the ends of the conductors 51, 51'. They are connected by soldering so that they correspond to each other. The outer ends of the conductors 51 and 51' are formed perpendicular to the side wall of the divided case.
The covered lead wires 6, 6' are at the opposite end (free end)
is connected by soldering so as to extend inward of the case, but is pulled out from the notch 17 by folding back.

After connecting as above, the coated lead wire 6,
After the covered portion near the soldered connection portion 6' is fixed to the printed circuit boards 5, 5' with a transparent adhesive, the entire abutting surface of the divided case 1 is surface ground. In addition, 1
Reference numeral 8 designates a cutout portion for filling resin into the case after the two divided cases are butted and connected.

As shown in FIG. 2, a pair of split cases (intermediate assemblies) with a symmetrical structure assembled in this way are butted together while sandwiching a magnetic gap material such as titanium foil between the abutting surfaces on the front end side of the split core 2. Through holes 162 and screw holes 163 formed in the partition wall 16 of each divided case
Threaded rods 7 are screwed in from opposite directions to tighten the divided cases 1 and 1' together. At this time, the covered lead wires 6, 6' are folded back and pulled out from the notch 17 to the outside of the case. The coated lead wire 6 pulled out in this way,
6' to the conductors 51, 5 on the printed circuit boards 5, 5'.
Connect each pin terminal of the external connection pin terminal board 8 in order while checking the outer end of the terminal 1'. For this connection, since the correspondence between the covered lead wires 3, 3' from the coils of each split core and the outer ends of the conductors 51, 51' on the printed circuit boards 5, 5' has already been determined, No troublesome confirmation work is required for the connection between the covered lead wires 6, 6' and the pin terminals. After that, the holding plates 9, 9' are attached to both ends of the pin terminal plate 8 for external connection, and the pin terminal plate 8 is attached to the notch part 1 of the case.
By fitting the covered lead wires 6, 6' into the stepped portion 171 provided in the case 7, the covered lead wires 6, 6' are housed in the case. Furthermore,
After filling the embedding resin into the case through the notch 18, the head-side front surfaces of the split cases 1 and 1' are ground in an R surface to obtain an 8-track ring-shaped magnetic head.

Note that since each of the pair of divided cores 2 that are butted against each other has a coil 20, one core has two coils.
This is to improve the sensitivity of the magnetic head, and these two coils are connected on the pin terminal plate 8 for external connection or to a pin terminal, and are connected in series by an external circuit.

As explained above, according to the present invention, a printed circuit board is interposed between the covered lead wire from the coil wound around the split core and the covered lead wire connected to the pin terminal of the pin terminal board for external connection. By doing so, a ring-type magnetic head with two or more tracks can be manufactured efficiently with less occurrence of defects due to disconnection or incorrect connection. That is, the covered lead wire connected to the lead terminal of the coil is connected to the inner end of the conductor of the printed circuit board at the beginning of assembly, and the covered lead wire is also connected to the outer end of the conductor at the beginning of assembly. Therefore, there is almost no crosstalk and it is easy to handle. Also, after matching the split cases,
Since it is only necessary to check the outer end of the conductor, there is no need to number the coated lead wires connected to the external connection pin terminal board, and the number of handling of the coated lead wires is reduced, resulting in the occurrence of disconnections and incorrect connections. decreases.
Even if there is an incorrect connection between the pin terminal and the covered lead wire, if it is before the pin terminal board for external connection is fixed to the case, the wiring can be corrected by checking the covered lead wire and the conductor again without disassembling the case. can do.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an intermediate assembly of an embodiment of the magnetic head according to the present invention, FIG. 2 is a perspective view showing the magnetic head assembly before the external connection terminal board is attached, and FIG. FIG. 2 is a cross-sectional view showing the installation relationship of the split cores, coils, and covered lead wires in the core holder 12 shown in FIG. 1. FIG. In the figure, 1 and 1' are split cases, 2 is split core,
3, 3', 6, 6' are covered lead wires, 4 is a shield plate, 5, 5' are printed circuit boards, 7 is a screw rod, 8 is a pin terminal plate for external connection, 9, 9' is a holding plate, 12 ，
12' is a core holder, and 13 and 13' are lead extraction parts.

Claims (1)

[Scope of utility model registration request] A pair of split cases each having a core holder fitted with a plurality of split cores each having a number of coils wound thereon corresponding to the number of tracks are butted together so that the pairs of split cores butt against each other, and the leads of the plurality of coils are aligned. In the ring-type magnetic head, the magnetic head is pulled out through a plurality of pin terminals of an external connection pin terminal board provided on the side surface of the divided case, and in each of the divided cases, there is a wire extending from the core holder to the external connection terminal. A substrate on which a plurality of conductors corresponding to the leads are adhered is fixed, and between the leads of the plurality of coils and one end side of the plurality of conductors, and between the plurality of pin terminals and the other of the plurality of conductors. A magnetic head characterized in that the end side is connected with a coated lead wire.