JPS6288116A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To decrease a signal magnetic flux picked up by an erasing gap, and to reduce a noise excited by a write-read head, by positioning a write-read gap and the erasing gap so that they are not parallel to each other. CONSTITUTION:A write-read head 1 and an erasing head 2 are manufactured by plating at a desired angle a block 7 for forming a write-read gap 5 and a block 8 for forming an erasing gap 6, and cutting them along a dotted line 9. This head 1 and 2 are pressed and positioned by pushing and pinching them as indicated with an arrow 12 from both sides by a slider 3 of a nonmagnetic material, and fixed by a placed glass rod 10. In this way, a signal magnetic flux picked up by the erasing gap by a loss based on an inclination of the erasing gap and a signal can be decreased and a noise excited by the head 1 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite magnetic head used in a magnetic recording/reproducing device.

[Summary of the invention]

The present invention provides a composite magnetic head in which the writing-reading gap and the erasing gap are not parallel, so that the signal recorded on the medium and the erasing gap are tilted, and the erasing gap reproduces the signal by using the loss caused by the tilting. This reduces magnetic flux and reduces noise due to magnetic interference from the erase head energized by the write-read head.

[Conventional technology]

As shown in FIG. 8, the conventional composite magnetic head consists of a block +6 that forms a read gap and a block 17 that forms an erase gap, with a spacer 19 of a desired thickness sandwiched between both ends of the block +6, which forms a read gap, and a block 17 that forms an erase gap. After enclosing and fixing the magnetic material 18, it is cut along the dotted line 20 to produce the magnetic head core +5 shown in FIG. 7.
8 and 1983-44219, the writing-reading gap and the erasing gap were parallel, as shown in Figures 6 and 7.

[Problems and objects to be solved by the invention] However, in the prior art described above, since the signal recorded on the medium by the write-read gap is parallel to the erase gap, the signal is erased as shown in FIG. 9(a). When the gap +5 is placed above the signal 21, the erase gap picks up the signal magnetic flux, and this magnetic flux is excited by the 8-bit read head due to magnetic interference and becomes noise as shown in FIG. 9(b). The problem is that the noise increases as the number of portions X22 placed above the signal increases.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and an object of the present invention is to provide a composite magnetic head in which magnetic interference from the erase head to the write-read head is small.

[Means to solve the problem]

The writing-reading gap has a predetermined width regulated by grooves formed on both sides of the magnetic core in the thickness direction, and the width of the writing-reading gap is the same as that of the writing-reading gap described above. two erase gaps formed at both ends of the gear, and a nonmagnetic layer between the write-read gap and the erase gap to completely separate the magnetic paths of each gear to prevent mutual magnetic interference. The magnetic head is characterized in that the 8-read gap and the erase gap are not parallel to each other.

[Effect]

According to the above configuration of the present invention, the signal on the medium and the erase gap are no longer parallel, and the loss due to the slope between the erase gap and the signal makes it possible to completely reduce the magnetic flux generated in the erase gap. The noise introduced into the write-read head can be reduced.

〔Example〕

FIG. 1 is a front view of a composite magnetic head according to an embodiment of the present invention, FIG. 2 is a V-kneeling head used in the composite magnetic head, and FIG. 5 is an erasing head. As shown in FIG. 4, by arranging the block 7 forming the write-read gap 5 and the block 8 forming the erase gap 6 at a desired angle and cutting along the dotted line 9, the write-read A head and the erase head can be manufactured. Next, as shown in FIG.
1 from both sides according to the arrow 12, position and fix the erasing head 2 by pressing it against the writing-reading head t, and placing a glass rod 10 and fixing it with glass, as shown in FIG. Composite magnetic heads can be manufactured.

Figure 10(b) shows the excitation in the write-read coil when the composite magnetic head manufactured according to this example is placed on the signal 21 with an erase gap of 6ft as shown in Figure 10(a). Indicates the level of noise. Figure 10 ('
Even if the width X22 of the erasing gear 6 disposed on the signal 21 becomes wider as shown in 24 in b), the noise excited in the write-read head will not become larger than a certain level; This noise is much smaller than the noise 25 of the conventional composite magnetic head shown in FIG. 3(b).

〔Effect of the invention〕

As described above, according to the present invention, when the erase gap is placed on the signal, the noise excited in the write-read head can be made very small. If the slider, the 4#e-g writing head, and the erasing head are solidly layered using glass, there will be a difference in level between the slider, the writing/reading head, and the erasing head. It can be improved.

On the other hand, in the above-described embodiment, the reading gap was made parallel to the thickness direction of the core, and the erasing gap was made at a desired angle with respect to the thickness direction of the core, but the reverse case is also practical.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of a composite magnetic head according to the present invention. FIG. 2 is a perspective view of the open reading head of this embodiment. FIG. 5 is a perspective view of the erasing head of this embodiment. FIG. 4 is a perspective view showing how the write-read head and erase head of this embodiment are cut from the block. FIG. 5 is an assembly diagram of the composite magnetic head of this embodiment. Figure 6 is a front view of a conventional composite magnetic head. FIG. 7 is a perspective view of a helad core of a composite magnetic head according to the prior art. FIG. 8 is a perspective view of a head core block of a conventional composite magnetic head. FIG. 9(a) is a schematic diagram showing how the erase gap of a conventional composite magnetic head is arranged on a signal on a medium. FIG. 9(b) shows the relationship between the magnitude of noise excited in the write-read head due to magnetic interference from the erase gap of a conventional composite magnetic head and the width of the erase gap on the signal. graph. FIG. 1O(a) is a schematic diagram showing how the erase gap of the composite magnetic head according to this embodiment is arranged on the signal of the medium. FIG. 10(b) shows the relationship between the magnitude of noise excited in the write-read head due to magnetic interference from the erase gap of the composite magnetic head according to this embodiment and the width of the erase gap on the signal. graph. 1...Writing-reading head 2...Erasing head 5...Slider 4...Glass 5...Writing-reading gap 6...Erasing gap 7...Form the pot-reading gap Block 8...
・Block 9 forming the erase gear...Dotted line 10 indicating the cutting position...Glass rod +1...Arrow arrow indicating pressing the erase head against the writing-reading head 2...Two sliders - Arrow 15 indicating that the iF reading head and the erasing head are squeezed in...Composite magnetic rad core 14 by conventional technology...Writing-reading gap 15...Erasing gap X6...Seedling-reading Blocks forming a gap +7
...Block forming an erase gap +8...Nonmagnetic layer +9...Spacer 20...Dotted line 21 indicating the cutting position...Signal recorded on the medium 22...Above the signal Width of the arranged erasing gap (for convenience, it is assumed to be 2) 25...Noise width of the conventional composite magnetic head 2L...Noise width of the composite magnetic head of the present embodiment or more 1 C3 stone r Midorigome, Do'sha υh Hiro L 1 Figure 2 l! 1 Swearing 3 Figure 7'
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Claims (1)

[Claims] A writing-reading gap whose width is regulated by grooves formed on both sides of the magnetic core in the thickness direction, and a groove having a width equal to or smaller than the width of the writing-reading gap are formed on both sides of the magnetic core in the thickness direction. A composite comprising two erase gaps formed at both ends, and a non-magnetic layer between the write-read gap and the erase gap to separate the magnetic paths of each gap to prevent mutual magnetic interference. A composite magnetic head, wherein the write-read gap and the erase gap are not parallel to each other.