JPS63317909A - Vertical magnetic recording head - Google Patents

Abstract

PURPOSE:To eliminate a need of a dedicated erasing circuit and to simplify a circuit without demagnetizing data tracks neither distorting a reproduced waveform by providing an auxiliary core with a second main magnetic pole. CONSTITUTION:When a high frequency recording data signal is allowed to flow to an exciting coil 10, a magnetic exciting core 11 is excited to form a magnetic path passing first and second main magnetic poles 8 and 9. Then, the data signal is recorded by rear edge parts of magnetic poles 8 and 9. Recorded data 13a and 13b have angles of inclination to each other, and the magnetic pole 8 reproduces data 13a by the azimuth effect at the time of reproducing. Meanwhile, the magnetic pole 9 cannot reproduce the high frequency signal because it is thicker. Therefore, data 13b is not reproduced through being recorded, and the same effect as AC erasing is attained to prevent an influence of crosstalk. Further, an erasing current is unnecessary to simplify the circuit.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a perpendicular magnetic recording head that can easily perform tunnel erasure to prevent the effects of crosstalk and erasure before signal recording. .

[Conventional technology]

Figures 9 to 12 are for explaining the magnetic recording system employed in conventional FDDs (floppy disk drives), and Figures 9 and 10 are schematic explanatory diagrams showing the planar positional relationship. , FIG. 11 is a configuration diagram showing the head,
FIG. 12 is a block diagram.

In the figure, (11 is a recording head, C2 is an erasing head, and these are integrated through a spacer (F).
Air gap (la), (2a) and excitation coil (
Gl), (G2). (3) is a track on a recording medium, (4) is a modulation circuit, (5) is a recording amplifier,
(6) is a control circuit for controlling ON10FF of the erase current, and (7) is an erase circuit for flowing the erase current. And the erasing head (2) is the recording/reproducing head (1).
is provided so as to extend beyond both ends of the

In general, FDDs undergo repeated recording and reproduction, so some positional deviations occur. Therefore, in order to prevent noise caused by unerased original data when writing new data, erase a sufficiently wide width using the erasing head (2) as shown in Figure 9. ), and as shown in FIG. 10, the vicinity of both edges of the track immediately after being recorded by the recording/reproducing head (1) is erased by the erasing head (2).

Both of the above methods use a recording/reproducing head (1) and an erasing head (2).
have individual excitation coils (Gl) and (G2), the recording/reproducing head (1) receives data signals from the recording amplifier (5), and the erasing head (2) receives data signals from the erasing circuit (7).
The iDo (direct current) current records data on the recording medium with tunnel erasure or pre-erasure of signal recording, respectively.

Note that the field 2 of this technology, for example, the erasing method, is well known, and the erasing head is disclosed, for example, in Japanese Patent Laid-Open No. 59-17.
This is shown in Publication No. 714, etc.

[Problem that the invention seeks to solve]

In the above recording method, the recording/reproducing head (1)
Since different currents flow through the erase head (2) and the erase head (2), a dedicated erase circuit (7) is required, and the external magnetic field causes magnetic concentration in the erase head with a particularly large current value, causing the recorded data track to It is demagnetized and the output voltage of the recording/reproducing head (1) is reduced. Furthermore, there are cases where the reproduced waveform is distorted due to DO deletion.

This invention was made to solve the above-mentioned problems. It eliminates the need for an erasing circuit, simplifies the circuit, and also eliminates the need for demagnetizing data tracks and vertical The purpose is to obtain a magnetic recording head.

[Means for solving problems]

The perpendicular magnetic recording head according to the present invention has a magnetic auxiliary core provided with a second main magnetic field.

[Effect]

In this invention, the auxiliary core is provided with a second main magnetic pole, and pre-recording cleaning and tunnel cleaning can be performed simply by passing the data signal through the excitation coil as usual.

〔Example〕

An embodiment of the present invention will now be described with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing a perpendicular magnetic recording head according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the configuration of FIG. 1, and FIG. 3 is a plan view of the head and recording medium shown in FIG. 1. A schematic explanatory diagram showing the positional relationship, and FIG. 4 is a block diagram illustrating a signal recording section according to the present invention.

In FIG. 4, (8) is orthogonal to the recording medium track,
The first main magnetic pole for recording data in the center of the track (
9) is a second main magnetic pole for erasing AC using a data signal, which is thicker than the first main magnetic pole (8) and tilted at a constant angle θ with respect to the first main magnetic pole (8). It is formed.

These first main magnetic poles (8) are connected to a magnetic excitation core 0 having one excitation coil (7), and the second main magnetic pole (9) is connected to a magnetic auxiliary core (2) that forms a magnetic closed loop with the magnetic excitation core (b).
2) respectively. Above 1st. 2nd main magnetic pole (8
)(Q), excitation coil QQ, magnetic excitation core 0. This is a perpendicular magnetic recording head composed of a magnetic auxiliary core (2) and the like.

Next, the effect will be explained. A high frequency recording data signal is sent to the excitation coil (to), the modulation circuit (4), and the recording amplifier (5).
), the magnetic excitation core 0 is excited, and the first . A magnetic path passing through the second main magnetic pole (8) (93) is formed. As a result, data signals are recorded on the medium at the rear edge portions of the first and second main magnetic poles (8) (9). The recorded data (iaa) (xab) have an inclination angle θ to each other, and during reproduction, the first main magnetic pole (8) mainly reproduces the data (13,) due to the azimuth effect.

In addition, since the second main magnetic pole (9) is formed thick,
Data (13a) (13b), which are high frequency signals, cannot be reproduced. Therefore, even if data (13b) is recorded, it cannot be reproduced, and the same effect as when AC erasing is obtained, thereby preventing the influence of crosstalk.

Also, because it is erased using the recorded data signal.

No current for erasing is required, the circuit is simplified without the need for the conventional erasing circuit (7) and control circuit (6), and a recording state equivalent to the conventional one can be obtained.

In the above embodiment, the second main magnetic pole is connected to the recording track (13a
) (13b), but even if it is provided only at both ends of the track as shown in FIGS. 5 and 6, the same effect as in the above embodiment can be obtained and tunnel elimination can be performed.

Moreover, the same effect can be obtained even if the edge of the second main pole (9) is formed non-linearly as shown in FIGS. 7 and 8.

〔Effect of the invention〕

As described above, according to the present invention, the first main magnetic pole for recording signals in the center of the track, and the second main magnetic pole provided in the auxiliary core
A perpendicular magnetic head with a main magnetic pole that enables AO erasing of the track end using a data signal, eliminating the need for a conventional erasing circuit, without demagnetizing the data track, and without distorting the reproduced waveform. There is an effect that can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a perpendicular magnetic recording head according to the present invention;
2 is a planar schematic diagram of the perpendicular magnetic recording head of FIG. 1, FIG. 3 is an explanatory diagram showing the planar positional relationship of FIG. 1, and FIG. 4 is an example of a signal recording section according to the present invention. The block diagram and FIGS. 5 to 8 are planar schematic diagrams showing other embodiments of the present invention, and FIGS. 9 and 10 are schematic planar positional relationships for explaining the conventional example. An explanatory diagram, FIG. 11 is a configuration diagram showing details of the head, and FIG. 12 is a block diagram illustrating a signal recording section in a conventional system. In the figure, (1) is a recording/reproducing head, and (2) is an erasing head. (to) is the data track, (4) is the modulation circuit 1, (5) is the recording amplifier, (6) is the control circuit, (7) is the erasing circuit, (
8) is a first main magnetic pole, (9) is a second main magnetic pole, αO is an excitation coil, (6) is a magnetic excitation core, (2) is a magnetic auxiliary core, and (13a) and (13b) are tracks. Note that in the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (4)

[Claims] (1) A first main magnetic pole that records signals on a track of a recording medium, a magnetic excitation core that contacts and excites this main magnetic pole, and a magnetic auxiliary core that forms a magnetic closed loop with the main magnetic pole and magnetic excitation core. A perpendicular magnetic recording head comprising: a second main magnetic pole provided in the magnetic auxiliary core. (2) The second main magnetic pole is thicker than the first main magnetic pole and is formed to be inclined at a certain angle with respect to the first main magnetic pole. magnetic recording head. (3) The perpendicular magnetic recording head according to claim 1 or 2, wherein the second main magnetic pole is formed wider than the first main magnetic pole. (4) The perpendicular magnetic recording head according to any one of claims 1 to 3, further comprising an excitation coil that forms a magnetic path including the first and second main magnetic poles.