JPH0118499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rotating magnetic head.
In particular, the present invention relates to a method of manufacturing a rotating magnetic head used in, for example, a VTR (Video Tape Recorder).

FIG. 1 is an external perspective view showing an example of a head chip and a head base, which is a support for the head chip, used in a conventional rotating magnetic head. In the configuration, the head chip 3 has a head gap 5 at the center of its side surface.
is formed. Furthermore, a winding window 4 for winding a coil (not shown) is formed. A portion of this head chip 3 is adhered to the head base 2 with an organic adhesive or the like. This head base 2 has a rotating cylinder (second
A screw hole 1 is formed in the center of the screw hole 1 for fixing it to the main body.

FIG. 2 is a plan view showing an example of a conventional rotating magnetic head using the head chip 3 of FIG.
FIG. 3 is also a side view thereof. In the configuration, a head base 2 is mounted on the top surface of a cylindrical rotating cylinder 6.
and head chip 3 are attached by screws 7. A pair of the head base 2 and the head chip 3 are provided around the rotation center O of the cylinder 6. Further, head chips 3, 3 each protrude from the end face of the rotary cylinder 6 by a distance h, and are brought into sliding contact with a tape (not shown) to perform recording or the like.

Now, a pair of head tips 3 are attached to the rotating cylinder 6.
The following conditions are required when installing. That is, (i) the amount h of protrusion of the head tips 3, 3 from the end surface of the rotary cylinder 6 must be regulated with high precision, for example, 50 μm±10 μm. (ii)
A straight line A-A passing through the rotation center O of the rotating cylinder 6
(FIG. 2) The two head gaps 5, 5 on the top must match perfectly. (iii) Rotating cylinder 6
The head gaps 5, 5 must be completely parallel to the axis of rotation B--B (FIG. 3). In order to mount the head chips 3, 3 so as to satisfy the above conditions (i) to (iii), extremely high precision assembly is required. Therefore, in the conventional rotating magnetic head, it takes a lot of time to attach the two head chips 3, 3 on the surface of the rotating cylinder 6. Furthermore, in the rotating magnetic head shown in Figs. 2 and 3, even if the positions of the gap 5, 5 are adjusted, the head tips 3, 3 move when tightening the screws 7, 7, resulting in poor accuracy. There were some drawbacks, such as:

Therefore, the main object of the present invention is to provide a method of manufacturing a rotating magnetic head with improved accuracy and workability during assembly.

The method for manufacturing a rotating magnetic head according to the present invention includes:
A pair of head core blocks with at least one surface polished are butted and fixed together, and the pair of fixed head core blocks is cut diagonally to a plane perpendicular to the butted surface to produce a head chip. The manufactured head chip is mounted on a rotating support.

The above objects and other objects and features of the invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 4 is a plan view showing a magnetic head, which is the premise of the present invention, and FIG. 5 is a side view thereof. In this structure, a head tip 14 is fixed to the upper surface of the rotating cylinder 6' with an organic adhesive or the like. This head chip 14 has two head gaps 5, 5 at both longitudinal ends thereof. Further, the head tips 14 are formed such that their respective tips protrude by an amount h from the end surface of the rotary cylinder 6'. Further, winding windows 1 for winding a coil (not shown) are provided near both ends of the head chip 14.
1 and 11 are formed.

6 to 9 are diagrams showing an example of the processing procedure for the head chip 14 used in the embodiment of FIGS. 4 and 5. FIG. FIG. 6 shows a head core block half 8 made of ferrite. One side of the head core block half 8, that is, the gap abutment surface 9, is polished to an optically flat surface. FIG. 7 shows another head core block half 10 made of ferrite like FIG. 6. This head core block half 10 has two grooves 11, 11 formed therein which will later become winding windows for winding a coil (not shown). Further, an escape groove 12 is formed between these two grooves 11, 11. This relief groove 12 is intended to reduce the area of the gap abutting surface 9' to make it easier to create a flatter surface. To achieve more accurate width uniformity. The gap abutment surface 9' is polished to an optically flat surface similar to the gap abutment surface 9 in FIG. A non-magnetic gear spacer (not shown) made of SiO ₂ or the like is placed on these gap abutting surfaces 9, 9' to keep the gap width (for example, 0.5μ).
It is formed by a method such as vacuum evaporation to a thickness corresponding to m).

FIG. 8 shows the gap abutment surface 9 of the head core block half 8 and the gap abutment surface 9' of the head core block half 10 abutted against each other. These head core block halves 8 and 10 are butted together and then welded and fixed with glass or the like. Further, it is cut and polished as shown by broken lines 13. FIG. 9 shows the head tip 14 cut along the dashed line in FIG. 8 and polished. Head gaps 5, 5 are formed at both ends of the head tip 14 in the longitudinal direction.

Now, the respective protruding amounts h of both ends of the head tip 14 from the end surface of the rotary cylinder 6' shown in FIG. 4 can be regulated when the head tip 14 is processed.
That is, the length L between the grooves 11 and 11 in FIG. 7 and the length L' of the head tip 14 in FIG. 9 may be regulated in accordance with the diameter of the rotary cylinder 6' during each machining process. These regulations can be achieved all at once with high precision by machining, which is advantageous in terms of productivity. Also, whether or not the two gaps 5, 5 are completely aligned with the straight line A'-A' passing through the rotation center O of the rotating cylinder 6' can be determined by checking the respective gap abutting surfaces 9 shown in FIGS. 6 and 7. and 9' flatness. Since these gap abutting surfaces 9 and 9' are polished to optical flatness, the straightness of the gap 5, 5 can be regulated very precisely. Furthermore, regarding the parallelism between the rotating shaft B'-B' of the rotating cylinder 6' and the gap 5, 5, the head chip 14 can be fixed directly onto the surface of the rotating cylinder 6' without using a head base, so it is better than the conventional one. It can be regulated more precisely and easily compared to .

FIG. 10 is a diagram showing an example of a processing mode of a head chip used in a rotating magnetic head for azimuth recording according to the present invention. FIG. 10 may be identical in structure to FIG. 8. However, in Fig. 10, the line C-C perpendicular to the gap butting surface
It is cut along the broken line 13' inclined at an angle α with respect to the wafer and polished. FIG. 11 is an external perspective view showing the head tip 14' cut and polished in the manner shown in FIG. Figure 12 shows the head chip 14'
FIG. 3 is a side view showing a sliding surface A of FIG. As can be seen from this figure, the gap 5a has an azimuth angle of -α with respect to the line D-D perpendicular to the bottom surface of the head tip 14'.
has. FIG. 13 is a side view showing the sliding surface B of the head chip 14'. As can be seen from this figure, the gap 5b has an azimuth angle .alpha. with respect to the line DD perpendicular to the bottom surface of the head tip 14'.

Conventionally, a rotary head for azimuth recording requires two head chips with azimuth angles +α and -α. The installation and adjustment of these head chips is more difficult to achieve accuracy than the installation and adjustment of the head chips 3, 3 in FIGS. 2 and 3, and the adjustment takes time. However, if a rotating magnetic head is constructed using a head chip 14' as shown in FIG.
Accuracy can be increased during the processing stage, and adjustments during installation are also easier.

In the above embodiment, the case where the head tip is attached to the cylinder is shown, but it is clear that the same effect can be obtained even if the head tip is attached to the rotating yoke instead of the cylinder. In this case, the cylinder does not rotate, but the rotating yoke and head tip rotate.

As described above, according to the present invention, a rotating magnetic head is constructed using a head chip that is integrally formed in advance and has head gaps having opposite azimuth angles formed at both ends of the head chip in the longitudinal direction. Assembling the rotating magnetic head becomes easier, the mounting accuracy of the gap position can be significantly improved, and deviations in the gap position and fluctuations in the gap width do not occur.

In addition, head chips are obtained by butting a pair of head core blocks together and fixing them together, and then cutting the butted head blocks. This makes it possible to efficiently manufacture a large number of head chips at once, and to increase productivity. It is possible to improve performance and reduce production costs.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an example of a head chip and a head base, which is a support for the head chip, used in a conventional rotating magnetic head. FIG. 2 is a plan view showing an example of a conventional rotating magnetic head using the head chip shown in FIG. 1, and FIG. 3 is a side view thereof. FIG. 4 is a plan view showing a magnetic head, which is the premise of the present invention, and FIG. 5 is a side view thereof. 6, 7, 8 and 9 are diagrams showing an example of the processing procedure for the head chip 14 used in the embodiment of FIGS. 4 and 5. FIG. 1st
FIG. 0 is an illustrative view showing an example of a processing mode of a head chip used in a rotating magnetic head for azimuth recording according to the present invention. Figure 11 shows a head tip 1 cut and polished in the manner shown in Figure 10.
FIG. 4 is an external perspective view showing 4'. FIG. 12 is a side view showing the sliding surface A of the head chip 14'. FIG. 13 is a side view showing the sliding surface B of the head chip 14'. In the figure, 6' is a rotating cylinder, 14, 1
4' indicates the head tip.

Claims (1)

[Claims] 1. A pair of head core blocks with at least one surface polished are fixed by abutting the polished surfaces against each other, and the fixed pair of head core blocks is held at a predetermined angle with respect to a surface orthogonal to the abutting surface. A rotating device characterized in that a head chip is formed by cutting diagonally at an angle to form a head gap at both ends with opposite azimuth angles, and the head chip is mounted on a rotating support. A method of manufacturing a magnetic head.