JPS5933614A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate an easy production as well as to improve the S/N, by providing a track width prescribing groove only to one of two cores forming a gap and obtaining the relative position of both gaps when these gaps are formed. CONSTITUTION:A groove 80 is cut at both corner parts at the side of the gap forming surface of a core 100 to prescribe the gap width of a recording/reproducing head. At the same time, a groove 70 is cut at the center part of the gap forming surface side of a core 90 to prescribe the gap width of an erasing head. Then cores 100 and 90 are adhered via a nonmagnetic layer to both sides of a core obtained by laminating with adhesion plate type magnetic matters 60 and 60' on both sides of a plate type nonmagnetic matter 50. In this case, a prescribed relative position is satisfied between the gap 30 of the recording/reproducing head and the gap 40 of the erasing head. Thus the relative position accuracy is easily improved between these gaps 30 and 40, and this eliminate completely the miserased parts due to high density of tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a magnetic head that allows easy industrial production of a data recording head capable of recording and reproducing data with a good S/N ratio.

The magnetic head of a recording/reproducing device that uses a conventional magnetic disk is
As shown in FIG. 1, a head chip 20 having a recording/reproducing gap 30 and a head chip 10 having an erasing gap 40 are laminated, and as shown in FIG. One has a track width regulating groove 80 on the gap forming surface side of the cores 60 stacked on both sides, and as shown in FIG. 60
and 90 each have a structure having a track width regulating groove 80. In these structures, the tracks on the magnetic disk are circular, and the recording/reproducing gap and the erasing gap are separated from each other in the track direction, resulting in some unerased data, which deteriorates the S/N ratio during reproduction. Furthermore, as the track density increases, the relative positional accuracy of the recording/reproducing gap and the erasing gap becomes more sophisticated, making it difficult to manufacture. In particular, the magnetic head with the structure shown in FIGS. 2(a) and 2(b)
Non-magnetic plate 50. After laminating and adhering the magnetic plates 60, 60', it is advisable to process track regulating grooves 80, 70 on the front and back sides with high positional accuracy. Furthermore, since the magnetic head having the structure shown in FIGS. 3(a) and 3(b) has track regulating grooves in the cores 100, 60, 60', and 90, track misalignment is likely to occur. There were the above drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, provide a magnetic head with a good 8/N ratio, and which is easy to manufacture.

The basics of the present invention are to eliminate unerased data caused by circumferential tracks by precisely arranging the erasing head in a direction that makes the recorded data narrower than the track width; At the same time, in order to provide a head that makes this possible at a low cost, a track width regulating groove is provided on only one of the cores that form the gap, so that the relative position of the one-car gap can be determined when forming the gap. It was made easy.

The present invention will be explained below with reference to Examples.

FIG. 4(a) is a perspective view showing an embodiment of the head of the present invention, and FIG. 4(b) is an enlarged perspective view of the gap portion. A groove 80 regulating the gap width of the recording/reproducing head is installed in the core 1.
A groove 70 for regulating the gap width of the erasing head is provided at both corners of the gap forming surface of the core 90 by grinding, and then a plate is formed on both sides of the plate-shaped nonmagnetic material 50. The core 1 is laminated and bonded with a magnetic material 60.60', and then the core 1
Glue 00°90. At this time, the recording/reproducing head gap 30 and the erasing head gap 4o are aligned to predetermined relative positions. It can be made by the above steps.

5(a), (b) and FIG. 6(a), (b) also show an embodiment of the head of the present invention. The manufacturing method is the same as in the previous example. In this case, the number of grooves 70, 80 required only by pitch accuracy is easy to process, and can be processed simultaneously. Laminated body of cores 50, 60, 60' and core 90°1
When laminating and adhering 00, one operation is easy because the relative positions of gaps 30 and 40 are determined, and it is also easy to change Δ.

According to the present invention, the relative positional accuracy of the gaps 30 and 40 is easily improved, so that there are no unerased areas that occur due to increased track density, and track width regulating grooves can be processed more easily than with conventional heads. , can be made cheaply.

[Brief explanation of drawings]

1, 2, and 3 are diagrams showing the structure of a conventional magnetic head, and FIGS. 4, 5, and 6 are diagrams showing the structure of a magnetic head according to the present invention. Figure (a) is a perspective view, and each figure (b) is an enlarged view of the gear part. Explanation of symbols 10...Head chip for erasing, 20...
...Head chip for recording/playback, 50...Rad gap for recording/playback. 40... Rad gap for erasing, 5o...
...Non-magnetic material. 60.60'...Magnetic material, 70.80...
...Track width regulation groove, 90.100...Magnetic material

Claims (1)

[Claims] 1. It has a first gap for both recording and reproduction, and two second gaps for erasing that sandwich the first gap, and the gap between the first gap and the second gap is In a magnetic head having a non-magnetic material layer between the two gaps, only one core of the two cores forming the first gap has a groove for regulating the track width, and the groove has the groove. Only the core forming the second gap at a position sandwiching the core and the second gap has a groove for regulating the track width, and the second gap has a groove between the first gap and the track. A magnetic head characterized in that it is arranged at a predetermined dimensional position in the direction. 2. In the magnetic head according to claim 1,
Only one core of the two cores forming the second gap has a groove for regulating the track width, and the first core is located at a position sandwiching the core having the groove and the first gap. A magnetic head characterized in that only the core forming the gap has a groove for regulating the track width, and the second gap is disposed at a predetermined dimension position in the track direction from the first gap.