JP2619054B2 - Magnetic recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a digital magnetic recording apparatus.

[Prior Art] FIG. 4 shows, for example, “Theory of Magnetic Recording” (by Masaaki Nishikawa,
FIG. 1.2 of Asakura Shoten Co., Ltd., November 1985) shows a perspective view showing the relative relationship between a magnetic head and a magnetic recording medium in a conventional magnetic recording apparatus. FIG. 5 and FIG. FIG. 5 is an explanatory diagram showing a recording principle and a reproduction principle in the magnetic recording device of FIG. 4; In the figure, reference numeral 1 denotes a core, 2 denotes a coil, and 3 denotes a gap. The core 1, the coil 2 and the gap 3 constitute a magnetic head 4. Reference numeral 5 denotes a magnetic recording medium, 6 denotes an electric circuit for recording information by passing a write current through the coil 2 and reproducing information from a read voltage obtained from the coil 2, and 7 denotes current information on the magnetic recording medium 5. Data) is the track that you are trying to read or write.

Next, the principle of recording and the principle of reproduction in the conventional magnetic recording apparatus will be described. The principle of recording information on the magnetic recording medium 5 will be described with reference to FIG. The magnetic recording medium 5 moves relative to the magnetic head 4 in the direction of relative movement of the magnetic recording medium 5 as indicated by an arrow D in FIG. 5, whereby the magnetic head 4 and the magnetic recording medium 5 perform relative movement. An alternating current flows through the coil 2 in accordance with information (data) recorded by the electric circuit 6. The coil 2 and the core 1 generate an alternating magnetic field (magnetic flux) according to the alternating current. The alternating magnetic field leaks from the gap 3 and reaches the magnetic recording medium 5. The magnetic recording medium 5 is magnetized in the direction indicated by the arrow in FIG. 5 in accordance with the alternating magnetic field leaking from the gap 3, whereby information is recorded on the magnetic recording medium 5.

Next, the principle of reproducing information from the magnetic recording medium 5 will be described with reference to FIG. As shown in FIG. 6, a part of the magnetic flux generated from the magnetic recording medium 5 penetrates the core 1 and links with the coil 2. Here, when the magnetic recording medium 5 moves in the direction of relative movement of the magnetic recording medium 5 indicated by an arrow D in FIG. 6, the magnetic flux orthogonal to the coil 2 changes with time, so that the magnetic flux of the coil 2 follows the Faraday's law of electromagnetic induction. Voltage is generated at both ends. When the magnetic head 4 passes through the reversal portion of the magnetization of the magnetic recording medium 5 (the reversal portion of the magnetization direction of the magnetic recording medium 5 indicated by an arrow in FIG. 6), the time change of the magnetic flux interlinking with the coil 2 becomes maximum. Therefore, the voltage generated at both ends of the coil 2 also becomes maximum. Therefore, if the position of the maximum voltage is detected by the electric processing by the electric circuit 6, the position of the reversal of the magnetization of the magnetic recording medium 5 can be known, so that the information can be reproduced from the magnetic recording medium 5.

[Problems to be Solved by the Invention] In the above-described conventional magnetic recording medium, information is recorded / reproduced according to the recording principle and the reproduction principle described above. However, the amount of information to be recorded / reproduced increases. If the magnetic recording medium 5 must be magnetized more densely, the reproduction output decreases due to the demagnetizing effect, and as a result, the reliability of the magnetic recording device decreases. there were.

Hereinafter, such a situation will be described with reference to FIG. FIG. 7 is a view for explaining a demagnetizing effect which is a problem in the magnetic recording apparatus of FIG. FIG. 7A is a diagram showing the relationship between the magnitude of the alternating magnetic field leaking from the gap 3 during recording and the position on the magnetic recording medium 5, and FIG. FIG. 4 is a diagram showing a relationship between the magnitude of magnetization at a magnetization reversal part and a position on a magnetic recording medium 5.

When information is recorded, an alternating magnetic field having a reversal width of 0 is generated as shown in FIG. 7 (A). Therefore, ideally, the magnetization state of the magnetic recording medium 5 shown in FIG. The reversal width should be 0 as in the above, but a polarization magnetic charge appears in the reversal region of the magnetization of the magnetic recording medium 5, which causes a demagnetizing field before and after the reversal position of the magnetization, and the reversal width of the magnetization. Act to spread out, the width of the magnetization reversal spreads out in a self-balancing manner. When the magnetization reversal interval of the magnetic recording medium 5 is coarse, the increase in the magnetization reversal width can be ignored, but when the magnetization reversal interval becomes narrow, the effect cannot be ignored. As a result, an error in reading the reversal position of the magnetization of the magnetic recording medium 5 occurs, and the reliability of the magnetic recording device is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic recording apparatus that suppresses an increase in the width of magnetization reversal due to a demagnetizing effect and improves reliability.

[Means for Solving the Problems] In the magnetic recording apparatus according to the present invention, the magnetization direction of the magnetic recording medium is perpendicular to the relative movement direction of the magnetic head and the magnetic recording medium and parallel to the surface of the magnetic recording medium. In addition, the arrangement direction of the magnetic head is configured, and further, in the magnetic recording medium, only the track portion where data is written is formed of a magnetic material,
The track interval is made of a non-magnetic material.

Further, in the magnetic recording apparatus according to the present invention, the magnetic head is disposed such that the magnetization direction of the magnetic recording medium is perpendicular to the relative movement direction of the magnetic head and the magnetic recording medium and parallel to the surface of the magnetic recording medium. The magnetic recording medium has a configuration in which a track portion for writing data is formed in a convex portion and a track interval is formed in a concave portion.

[Operation] In the magnetic recording apparatus of the present invention, the magnetic head is disposed such that the magnetization direction of the magnetic recording medium is perpendicular to the direction of relative movement between the magnetic head and the magnetic recording medium and parallel to the surface of the magnetic recording medium. Since the orientation is configured, the magnetization reversal interval of the magnetic recording medium is larger than the core width of the magnetic head,
Since no polarization magnetic charge appears in the reversal part of the magnetization,
No demagnetizing field is generated, so that the width of reversal of magnetization is not widened.

Further, since the track interval of the magnetic recording medium is formed of a non-magnetic material, the track interval is not magnetized by the magnetic head, so that the interaction between the tracks becomes very small and can be ignored. Can be reduced to

The magnetic recording device according to the present invention may be arranged such that the magnetization direction of the magnetic recording medium is perpendicular to the relative movement direction of the magnetic head and the magnetic recording medium and parallel to the surface of the magnetic recording medium. Since the magnetization reversal interval of the magnetic recording medium is larger than the core width of the magnetic head and no polarization magnetic charge appears at the reversal part of the magnetization, no demagnetizing field is generated. Is not extended.

Further, since the track interval of the magnetic recording medium is formed by the concave portion and is separated from the magnetic head, the influence of the magnetic flux leaking from the gap is small. The spacing is hardly magnetized. Thus, the interaction between tracks is very small and can be reduced to a negligible extent.

FIG. 1 is a perspective view showing a relative relationship between a magnetic head and a magnetic recording medium in a magnetic recording apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a magnetization state of a magnetic recording medium in the magnetic recording device of FIG. In the figure, 1 is a core,
Reference numeral 2 denotes a coil, and reference numeral 3 denotes a gap. The core 1, the coil 2, and the gap 3 constitute a magnetic head 4. Reference numeral 5 denotes a magnetic recording medium, 6 denotes an electric circuit for recording information by passing a write current through the coil 2 and reproducing information from a read voltage obtained from the coil 2, and 7 denotes current information on the magnetic recording medium 5. Track 8 where data is to be read / written, and 8 is the track interval between tracks 7. Further, in the magnetic recording medium 5, only the track 7 on which data is written is formed of a magnetic material, and the track interval 8 is formed of a non-magnetic material. Therefore, the track interval 8 is not magnetized.

Next, the operation of the magnetic recording apparatus according to the embodiment of the present invention will be described. In the magnetic recording apparatus according to the present invention, as shown in FIG. 1, the orientation of the magnetic head 4 is such that the direction of the magnetic flux passing through the gap 3 of the magnetic head 4 corresponds to the relative movement direction of the magnetic head 4 and the magnetic recording medium 5. As shown in FIG. 2, the magnetization direction of the magnetic recording medium 5 in the above-mentioned conventional example is perpendicular to the magnetic recording medium 5 so that it is parallel to the surface thereof. And at right angles. In this case, as can be easily understood from FIGS. 1 and 2, the reversal interval of the magnetization of the magnetic recording medium 5 is larger than the width of the core 1 of the magnetic head 4 (a shown in FIG. 1). Therefore, since no polarization magnetic charge appears at the magnetization reversal portion, no demagnetizing field is generated, and therefore, the width of the magnetization reversal is not increased.

Further, since the track interval 8 of the magnetic recording medium 5 is formed of a non-magnetic material, the track interval 8 is not magnetized by the magnetic head 4, so that the interaction between the tracks 7 becomes very small. , Can be reduced to a negligible extent.

Further, in the magnetic recording apparatus of the present invention, with respect to the information recording / reproducing operation by the magnetic head 4, the arrangement direction of the magnetic head 4 is different from that of the conventional example in that the relative movement of the magnetic head 4 and the magnetic recording medium 5. However, the information can be recorded on the magnetic recording medium 5 by using the magnetic head 4 in the same manner as described with reference to FIGS. It is clear from FIG. 4 that information can be reproduced using the magnetic head 4.

FIG. 3 is a side view of a relative relationship between a magnetic head and a magnetic recording medium in a magnetic recording apparatus according to another embodiment of the present invention, as viewed from a lateral direction. Also in the magnetic recording device according to the present invention shown in FIG. 3, similarly to the magnetic recording device shown in FIG. 1, the arrangement direction of the magnetic head 4 is such that the direction of the magnetic flux passing through the gap 3 of the magnetic head 4 is different from that of the magnetic head 4. The magnetic recording medium 5 is configured so as to be perpendicular to the direction of relative motion of the magnetic recording medium 5 and parallel to the surface of the magnetic recording medium 5, so that the magnetization direction of the magnetic recording medium 5 is the same as that of the conventional example. It is perpendicular to the magnetization direction. For this reason, as described in FIGS. 1 and 2, no polarization magnetic charge appears in the reversal portion of the magnetization of the magnetic recording medium 5 in the embodiment shown in FIG. This does not occur, so that the width of reversal of magnetization is not widened.

Further, as shown in FIG. 3, the magnetic recording medium 5 is formed by forming a portion of a track 7 on which data is written into a convex portion, as viewed from the magnetic head 4 side, and forming a track interval 8 between the tracks 7. Is formed in the concave portion. Therefore, since the concave portion of the track interval 8 is separated from the magnetic head 4, the influence of the magnetic flux leaking from the gap 3 is small, and the track interval 8 is almost magnetized by the magnetic flux leaking from the gap 3. Never.
The interaction between the tracks 7 is therefore very small and can be reduced to a negligible extent.

[Effects of the Invention] As described above, according to the magnetic recording apparatus of the present invention, the magnetization direction of the magnetic recording medium is perpendicular to the relative movement direction of the magnetic head and the magnetic recording medium and parallel to the surface of the magnetic recording medium. The magnetic recording medium is configured such that only the track portion on which data is written is formed of a magnetic material and the track interval is formed of a non-magnetic material. Since the track portion to be written is formed in the convex portion and the track interval is formed in the concave portion, the demagnetizing effect is suppressed from appearing in the magnetization reversal portion of the magnetic recording medium. However, recording by dense magnetization reversal can be performed easily and reliably, thereby providing an excellent effect that the reliability as a magnetic recording device can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a relative relationship between a magnetic head and a magnetic recording medium in a magnetic recording apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a magnetization state of the magnetic recording medium in the magnetic recording apparatus in FIG. FIG. 3 is a side view of a relative relationship between a magnetic head and a magnetic recording medium in a magnetic recording apparatus according to another embodiment of the present invention, as viewed from the lateral direction. FIG. FIGS. 5 and 6 are perspective views showing the relative relationship of the magnetic recording medium, and FIGS. 5 and 6 are explanatory views showing the principle of recording and reproducing in the magnetic recording apparatus of FIG.
The figure is a diagram for explaining the demagnetizing effect which is a problem in the magnetic recording device of FIG. In the figure, 1 is a core, 2 is a coil, 3 is a gap, 4 is a magnetic head, 5 is a magnetic recording medium, 6 is an electric circuit, 7 is a track, 8 is a track interval. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

(57) [Claims] In a magnetic recording apparatus comprising a magnetic head and a magnetic recording medium, the direction of the magnetic head is such that the direction of a magnetic flux passing through a gap of the magnetic head is a relative movement direction of the magnetic head and the magnetic recording medium. At right angles to the surface of the magnetic recording medium, and in the magnetic recording medium, only the track portions on which data is written are formed of a magnetic material, and the track intervals are arranged in parallel with a nonmagnetic material. A magnetic recording device characterized by being formed by forming. 2. A magnetic recording apparatus comprising a magnetic head and a magnetic recording medium, wherein the orientation of the magnetic head is such that a direction of a magnetic flux passing through a gap of the magnetic head is a relative movement direction of the magnetic head and the magnetic recording medium. At right angles to the surface of the magnetic recording medium, and the magnetic recording medium has a track portion on which data is written as a convex portion when viewed from the magnetic head side, and a track interval. A magnetic recording device comprising: