JPH0145135B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a ring-shaped magnetic head.

Conventionally, as shown in FIG. 1, a ring-type head used in a magnetic recording/reproducing machine has a front abutment part 11 having a tapered end of a C-shaped core and a surface in contact with the magnetic tape, and a winding head. A pair of left and right magnetic cores 1, each consisting of a central linear yoke 12 with a line 2 and a rear abutting portion 13 bent at a substantially right angle to the central linear yoke, are symmetrically butted against each other. ing. These operations are carried out on magnetic core 1.
Store it in case 3 with the mating surface exposed to the outside,
The abutting surfaces together with the divided case 3 are polished. After polishing both the left and right magnetic cores 1, a nonmagnetic magnetic gap material is sandwiched between the front abutment part 11 that contacts the magnetic tape, and screws 5 are passed through both cases 3 from opposite directions and tightened. Further, a pin terminal plate 6 is provided on the outside of the rear abutting portion 13 for connecting the lead wire of the core winding to the outside, and the case 3 is filled with an embedded resin 7. After fixing both the left and right magnetic cores with resin, the surface of the front abutment part 11 where the magnetic tape comes into contact, together with the case 3, is polished in an arc shape as shown by the dashed line to create a ring-shaped magnetic head. .

However, when polishing the abutting surfaces of the magnetic core, a step is provided on the outside of the rear abutting portion 13 of the case 3 into which the pin terminal plate 6 fits, and the other three sides of the case 3 are flat. However, when polishing a surface, it is difficult to securely support the polishing jig. Therefore, holes or screws must be particularly provided in the case 3 to secure it to the jig and tools. This method requires an extra installation work to secure the case to the tool, and has the drawback of poor work efficiency.

The present invention eliminates such drawbacks of the conventional method by providing a groove along the abutting surface near the edge of the side surface of the case that comes into contact with the magnetic tape. The aim is to improve the

The present invention provides a ring-shaped magnetic head in which a wire is wound around the central linear part of a pair of C-shaped cores, the cores are abutted symmetrically, and a magnetic gap material is inserted between the abutting surfaces that contact the tape. The present invention relates to a method of manufacturing a magnetic head arranged in multiple stages.

That is, the present invention comprises two divided cases having symmetrical structures, and a core element wound around the center linear part of a C-shaped core, which is arranged in parallel and symmetrically in multiple stages in each of the divided cases together with the winding lead wire. Each fixed case has a long groove parallel to the abutting surface near the side edge of the surface of the magnetic head in contact with the tape, so that the surface of the magnetic head housed in these two cases is slightly narrower than the surface in contact with the tape. The two cases are butted and fixed so that each core forms a ring-shaped magnetic head with a protruding magnetic gap, and the groove is used as a holding part in the parallel polishing process of the surface in contact with the tape for R-surface polishing. The present invention relates to a method of manufacturing a magnetic head in which the grooves are removed by polishing.

FIG. 2 shows the structure of one of a pair of butt-jointed split cases used in the present invention. In the figure, the divided case 8 is formed symmetrically with respect to the center line A. A core holder 81 for storing the C-shaped magnetic core 1 of the split case 8 has a recess 83 in which the winding of the C-shaped magnetic core 1 is stored, a front wall 84 at the front of the split case 8, and a front wall 84 at the rear. A partition wall 85 and a stepped lead-out portion 82 for drawing out the lead wire of the winding are provided. Two C-shaped magnetic cores 1 are butted against the front wall 84 and the rear partition wall 85 (in the figure, the left one
Grooves 86 and 87 are provided at the front and rear for fitting and positioning with the polished surface facing outward. A shallow groove 88 is also provided near the outer edge of the outer surface of the front wall 84, which is the contact surface of the magnetic tape, parallel to the polishing surface. Furthermore, the terminal plate 6 is located below the drawer part 82 at the rear.
Cut out the stepped portion 89 by the thickness of the divided case 8.
A through hole 90 and a screw hole 91 are provided in the middle partition wall and side wall.

C with winding applied to the central straight arm part of the core
positioning groove 8 of split case 8.
6, 87, with the polished surface facing outward, the front abutment part 1
1 to the outer surface of the front wall 84, and extend the lead wire of the winding over the top of the partition wall 85 to the lead-out part 82.
Pull it out inside. The split case 8 with all the split cores installed in this way is shown in FIG. 4 by facing the split case 8' shown by the dashed line on the right side of FIG. 2, which also has all the split cores installed. As shown, groove 88,
A common fixing plate 94 of the surface grinding jig 93 is fitted so as to span 88', and another fixing plate 94' is engaged with the stepped portions 89, 89' to fix the divided cases 8, 8'. A plurality of magnetic cores fixed in this manner are polished at once.

The flat-polished split cases 8 and 8' are the third
As shown in the figure, the left and right sides are aligned, and the split case 8,
8' is filled with embedding resin, and a non-magnetic magnetic gap material is sandwiched between the abutting surfaces on the front wall 84 side, and the through hole 90 and the screw hole 91 are inserted into the screw rod 5 from opposite directions.
Tighten to assemble and secure both. Furthermore, the lead wire of the winding and the terminal of the pin terminal board 6 are connected.
After that, the contacting front surface of the magnetic tape is shaped like an arc, or R.
When polished, the polished surface becomes as shown by the broken line in FIG. 3, and the grooves 88 and 88' are both polished and disappear, resulting in a magnetic head having a smooth arc-shaped polished surface.

As described above, according to the method of the present invention, the split cases are well fixed to the jig and tool by the flat polishing work of the abutting surfaces of the split cases, and the attachment/detachment work is efficient, and the appearance is not impaired and the reliability is high. A magnetic head can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of a conventional ring-shaped magnetic head, FIG. 2 is a perspective view showing an example of a split case used in the magnetic head manufacturing method according to the present invention, and FIG. 3 is a side sectional view showing an example of a conventional ring-shaped magnetic head. 1 shows a perspective view of the external appearance of a magnetic head according to a method of manufacturing a magnetic head. FIG. 4 is a side view showing the state in which the magnetic core is polished with a surface grinding jig. In the figure 1: magnetic core, 2: winding, 8,
8': Split case, 5: Threaded rod, 83: Recess, 8
4: Front wall, 85: Partition wall, 86, 87: Positioning groove, 88, 88': Groove, 93: Surface grinding jig, 9
4: Common fixing plate.

Claims (1)

[Claims] 1 Winding the wire around the central straight part of a pair of C-shaped cores,
The cores are abutted symmetrically, and a magnetic gap material is inserted into the abutting surfaces in contact with the tape so that they are abutted and fixed, and a long groove parallel to the abutting surfaces is formed near the side edge of the surface in contact with the tape. Further, a core is wound around the central linear part of the C-shaped core in two split cases each having a symmetrical structure, each having a notch parallel to the groove on the bottom abutting surface opposite to the surface in contact with the tape. The two divided cases having a symmetrical structure are butted against each other and fixed, and the groove is used as a holding part in the plane polishing process of the surface in contact with the tape. A method for polishing a magnetic head, characterized in that the grooves are removed by grinding.