JPH04351704A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a head free from distortion of the reproduced waveform by inclining and widening the spacer, which isolates a recording and reproducing head and an erase head from each other, in the vicinity of a slope not to pick up an unnecessary signal. CONSTITUTION:The recording and reproducing head side of a spacer 5 which magnetically isolates a recording and reproducing head 3 and an erase head 1 from each other is inclined in the vicinity of a medium slope 7 and is widened. When the signal recorded by a recording and reproducing gap 4 is taken out at the time of reproducing information, the signal is picked up even by the spacer part, but this signal is reduced because the recording and reproducing head side of the spacer 5 is inclined and is widened. Therefore, the reproduced waveform is not distorted. When a thin film made of soft magnetic materials like sendust is formed on the spacer 5, the same effect is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for a floppy disk device, which is a combination of a recording/reproducing head for recording and reproducing information and an erasing head.

0002

[Prior Art] FIG. 7 shows, for example, Japanese Patent Laid-Open No. 61-243909.
1 is a cross-sectional configuration diagram showing a conventional magnetic head disclosed in the above publication. In the figure, 1 is an erasing head, 2 is an erasing gap provided in this erasing head 1, 3 is a recording/reproducing head, and 4 is this erasing head. This is a recording/reproducing gap provided in the recording/reproducing head 3. 5 is an erasing head 1 and a recording/reproducing head 3
This is a spacer for magnetically separating the two. FIG. 8 is a plan view of a conventional magnetic head viewed from the direction of the sliding surface with respect to the medium.

Next, the operation will be explained using FIG. 7. When recording information on a medium, the information previously recorded on the medium is completely erased using the erase gap 2, and then new information is recorded on the medium using the recording/reproducing gap 4. When reproducing information recorded on a medium,
The signal recorded on the medium is extracted through the recording/reproducing gap 4 and is extracted as information. At this time, a non-magnetic spacer 5 made of glass or ceramic is used to magnetically separate the erasing head 1 and the recording/reproducing head 3 so that the signal picked up by the erasing gap 2 does not enter the recording/reproducing head 3. It will be done. Since the distance between the recording/reproducing gap 4 and the erasing gap 2 is as narrow as 200 μm, the width of the spacer 5 is as thin as 50 μm or less.

0004

[Problem to be Solved by the Invention] Since the conventional magnetic head is constructed as described above, the signal picked up by the erase gap does not enter the recording/reproducing head, but the signal is picked up by the spacer part. However, there was a problem in that the reproduced waveform was distorted as shown at 10 in the waveform diagram of FIG. If the width of the spacer is made wider, this problem will not occur, but the core width of the magnetic head must be made narrower, resulting in a problem that the reproduction output itself will be reduced.

The present invention was made to solve the above-mentioned problems, and it is possible to create a magnetic field that does not cause distortion in the reproduced waveform by preventing unnecessary signals from being picked up by the spacer without reducing the reproduction output. The purpose is to provide the head.

[0006]

[Means for Solving the Problems] In the magnetic head of the present invention, the width of the spacer is increased at the medium sliding surface portion.

[0007]

[Operation] In the spacer of the present invention, the width of the spacer is increased at the medium sliding surface by, for example, tilting the angle formed by the spacer and the medium sliding surface near the medium sliding surface, so that unnecessary signals are generated. will not be picked up, and the played waveform will not be distorted.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a magnetic head according to a first embodiment of the present invention. In the figure, 1 is an erase head, 2 is an erase gap, 3 is a recording/reproducing head, and 5 is a spacer, and the recording/reproducing head 3 side is a medium. The width of the spacer 5 in the area of the medium sliding surface 7 is increased by tilting it near the sliding surface 7. 6 is the angle formed between the medium sliding surface 7 and the recording/reproducing head 3 side of the spacer 5. Next, the operation will be explained using FIG. When recording information on a medium, the information previously recorded on the medium is completely erased using the erase gap 2, and then new information is recorded on the medium using the recording/reproducing gap 4. When reproducing information recorded on the medium, the signal recorded on the medium is extracted through the recording/reproducing gap 4. At this time, the spacer section also picks up the signal, but since the recording/reproducing head 3 side of the spacer 5 is inclined near the medium sliding surface 7 to make the width wider, the signal picked up by the spacer section can be reduced. Therefore, no distortion occurs in the reproduced waveform. FIG. 2 is a characteristic diagram showing the relationship between the signal picked up by the spacer portion and the angle θ formed between the recording/reproducing head 3 side of the spacer 5 and the medium sliding surface 7. From the figure, the signal picked up by the spacer begins to decrease when θ is around 80°, so θ is preferably 80° or less, preferably 60°.
° or less, more preferably 45 ° or less.

Example 2. In the above embodiment, only the recording/reproducing head 3 side of the spacer 5 is shown tilted, but as shown in the cross-sectional configuration diagram of the magnetic head of the second embodiment of FIG. 3, both the spacer 5 and the erasing head 1 side may be tilted. Alternatively, only the erasing head 1 side may be tilted.

Example 3. In the above embodiment, the case of a pre-erase head is shown, but the above embodiment can also be applied to a tunnel erase head, as shown in FIG. It has the same effect as the example.

Example 4. In the above embodiment, the spacer is tilted, but as shown in the cross-sectional configuration diagram of the magnetic head of the fourth embodiment in FIG. The same effect can be obtained even if the width of the spacer is substantially increased at the medium sliding surface portion.

Example 5. FIG. 6 is a cross-sectional configuration diagram showing the magnetic head of Example 4, in which the width of the spacer 5 was simply widened as shown in the figure, without tilting the spacer 5 or forming a thin film as in the above example. You can get the same effect by just using it alone.

[0013]

As described above, according to the present invention, since the width of the spacer is increased at the medium sliding surface, it is possible to prevent the signal from being picked up at the spacer section, and to provide a magnetic head that does not cause distortion in the reproduced waveform. There is an effect that can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing a magnetic head according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the inclination angle of a spacer and an unnecessary signal picked up by the spacer according to the present invention.

FIG. 3 is a cross-sectional configuration diagram showing a magnetic head according to a second embodiment of the invention.

FIG. 4 is a plan view and a cross-sectional configuration diagram showing a magnetic head according to a third embodiment of the present invention.

FIG. 5 is a plan view and a cross-sectional configuration diagram showing a magnetic head according to a fourth embodiment of the present invention.

FIG. 6 is a plan view and a cross-sectional configuration diagram showing a magnetic head according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional configuration diagram showing a conventional magnetic head.

FIG. 8 is a plan view of a conventional magnetic head viewed from a sliding surface.

FIG. 9 is a waveform diagram showing waveform distortion occurring in a conventional magnetic head.

[Explanation of symbols]

1 Erasing head 3 Recording/playback head 5 Spacer 7 Media sliding surface

Claims (1)

[Claims] 1. A magnetic head having a structure in which a recording/reproducing head and an erasing head are integrated, characterized in that the width of a spacer that magnetically separates the two heads is widened at a portion of the medium sliding surface.