JPS60223003A - Vertical magnetic signal processing system - Google Patents

Abstract

PURPOSE:To reduce the crosstalk and also to improve the track density by decreasing both the width and the thickness of a track of the 1st main magnetic pole in the width and the traveling directions of said track respectively in comparison with those of a track of the 2nd magnetic pole. CONSTITUTION:A tracking signal of a low frequency is recorded in the track width direction of an SP head H by the 2nd magnetic pole 2a having large width. While a main signal of a high frequency is recorded to tracks 3a, 3b,... respectively by the 1st main magnetic pole 1a. Then an end or both ends 5a, 5b,... of tracks 3a, 3b,... where the main signal is recorded are erased by the tracking signal. This eliminates a gurd band as well as the effect of the crosstalk. At the same time, the lengthwise thickness of the track of the pole 2a is increased. As a result, no main signal is reproduced on a track by the pole 2a and only the tracking signal can be reproduced when the information recorded on a track is reproduced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a perpendicular magnetic signal processing method, and in particular to a method for reducing crosstalk between adjacent tracks on which main signals (data signals) are recorded. K. relates to a perpendicular magnetic signal processing method that can increase the recording density of magnetic recording media.

[Prior art]

BACKGROUND ART Recently, perpendicular magnetic recording methods have been attracting attention, in which residual magnetization is formed in the thickness direction of a magnetic recording medium and main signals are recorded and reproduced on the magnetic recording medium at high density. According to this system, the shorter the wavelength of the recorded signal, the more the magnetic field can be reduced, and it is expected that high-density recording with excellent short wavelength characteristics will be possible.

1 and 2 are schematic illustrations for explaining the writing method employed in this perpendicular magnetic recording system. In FIGS. 1 and 2, (1) is a recording/reproducing head, (2) is an erasing head, and (3) is a track on a magnetic recording medium. And erase head (
e) is an IC816 that extends beyond both ends of the recording/reproducing head (1), and when recording the main signal on the track (3) on the magnetic recording medium, the recording/reproducing head (1) is - Pressure is provided to prevent crosstalk caused by the playback head (1) being operated while spanning adjacent tracks.

FIG. 3 shows a mode in which a recording/reproducing head (υ) and an erasing head (2) are arranged for a plurality of tracks (ja, jb, ja).

At this time, there are no signal areas (4ta) on both sides of each track.
, a), (+b, l1b), and (+c, +c) are generated respectively and are set to play the role of a guard band.

Also, since the F, D, D, device usually lacks a tracking signal, the rack density cannot be significantly improved. On the other hand, in the case of a rigid disk, by providing a disk exclusively for tracking signals, the track density can be considerably improved. However, due to its structural limitations, F, D
, D Apparatus K It is difficult to provide a disk exclusively for tracking signals, such as a Jid disk.

[Summary of the Invention] The present invention was made in view of the problems in the prior art as described above, and reduces crosstalk by recording a tracking signal in the non-signal portion between each track. Another object of the present invention is to provide a perpendicular magnetic signal processing method that can improve track density.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the perpendicular magnetic signal processing method according to the present invention will be described.

Figure D illustrates a recording pattern for each track (Ja, Jb,...) when recording signals on a magnetic recording medium using the perpendicular magnetic signal processing method according to the present invention. This corresponds to the case shown in FIG. 3, which shows a conventional example. 8, P used in this gp diagram
For example, as shown in FIGS. S and 6, the head includes a first . The main magnetic poles (75L) and (Ja) are provided in parallel with each other in the track width direction with different shapes, and magnetic cores (?a, 7b, ?c, ri d) are provided on both sides thereof.
) is provided to sandwich these, and an excitation coil (Aajb) is wound around the outer periphery of the excitation coil (Aajb).The main pole excitation element is configured such that it is excited by the flow of a current. Note that Figures 1 and 2 are perspective views illustrating the configuration of the S, P, and heads for the perpendicular magnetization recording/reproducing system according to the present invention, and Figure 6 is a perspective view of the configuration of the 8, P, and 8 heads illustrated in Figure S. P,
FIG. 2 is a schematic plan view showing the configuration of a head.

Among the magnetic cores (7a) to 7d), a magnetic core (tb) is located inside the main pole excitation element.

(7C) is a magnetic core (f
), and are connected by a connecting part (ri) at the bottom of each. And like this 8. By using the head (6), signals are recorded and reproduced on the magnetic recording medium.

Referring again to Fig. DA, a low-frequency tracking signal is recorded by the main magnetic pole (core a) K which is wide in the track width direction of the s, p, and heads.
A high-frequency main signal is recorded on tracks (Ja, Jb, . . . )K by the main magnetic pole (/Jl)K of Il. The tracking signal is composed of three different types of signals, which are repeatedly recorded every round of the track, and during playback, it is difficult to determine the exact track position due to the differences between adjacent tracking signals. Detected.

Also, 8. The head (6) is placed at a target position on the track according to its mechanical precision, and the tracking signal is also recorded as a fine adjustment signal. Furthermore,
The track on which the main signal is recorded (, 7a, ,
? b, ...), one end or both ends (ja, j
By eliminating the signals b, .

In addition, the above-mentioned No. 1. First main magnetic pole (/a) and (core a)
If the thickness of the latter track in the longitudinal direction is increased, then when reproducing the recorded information on the track,
Due to this first main magnetic pole (ja), only the tracking signal can be reproduced without reproducing the main signal on the track, which is a high frequency signal.

FIG. 7 is a block diagram showing a signal reproducing section in the system of the present invention. In FIG. 7, the signal reproduced by the first main magnetic pole (za) having a narrow width in the track width direction is amplified by an amplifier (zOa) K, and then passed through a filter (//
), the tracking signal is removed, and only the data signal (main signal) is passed through the demodulation circuit (lJa).
demodulated data is obtained. In addition, the tracking signal reproduced by the first main magnetic pole (2a), which is wide in the track width direction, is amplified by an amplifier (10b), demodulated by a demodulation circuit (lcob), and then sent to a control circuit. (
7, 7) The track position is detected by K, and a control signal is sent to the motor drive amplifier (/l) K to drive the head control motor (13), which causes the head to move toward the track. Fine adjustments are made to occupy the correct position.

〔Effect of the invention〕

As is clear from the above description, the present invention provides the following remarkable effects.

In other words, by erasing one or both ends of the main signal in the track width direction using a tracking signal, the conventional guard band is not required, and the position of the head can be finely adjusted by obtaining the tracking signal during playback. As a result, crosstalk can be reduced and track density can be increased.

[Brief explanation of the drawing]

Figures 1 and #1 are explanatory diagrams illustrating the writing method in the conventional perpendicular magnetization recording system, and Figures gj are explanatory diagrams showing the planar positional relationship between the magnetic head and the recording medium in the conventional system of Figure 1. , FIG. 1 is an explanatory diagram showing the planar positional relationship between the head and the recording medium in an embodiment of the present invention, and FIG.
FIG. 6 is a perspective view illustrating the configuration of the B, P, and heads for the reproduction method; FIG. 6 is a schematic plan view showing the configuration of the 8, P, heads illustrated in FIG. 5; FIG. FIG. 2 is a block diagram illustrating a signal reproducing section in the method of FIG. l...record/playback head, c...erase head, /a...
First main magnetic pole, 2a...First main magnetic pole, 3.3a to 3d
...Track, +a~daC...No signal area (guard punt), 6a~! d... Track end, 4a, Ab... Excitation coil, 7a to 7d. t...magnetic core, de...connection section, 10a, 10b...amplifier%11@-filter, l core a,/bth demodulation circuit,
13...Control circuit, tlI...Motor drive-amplifier, lj...Head control motor. In each figure, the same reference numerals indicate the same or similar parts. Flame 3 Figure Light 4 Figure 5

Claims (1)

[Scope of Claims] (1) A perpendicular magnetic signal processing method for recording and reproducing information by direct magnetization of K11L on a track of a magnetic recording medium, including first and first main magnetic poles for recording and reproducing information. A magnetic head is used, and the width of the first main pole in the track width direction and the thickness in the traveling direction are as follows:
A perpendicular magnetic signal processing system characterized in that both of the poles are smaller than the first main pole. (g) A high-frequency main signal is recorded and reproduced using the first main magnetic pole, and a low-frequency tracking signal is recorded and reproduced using the first main magnetic pole. The perpendicular magnetic signal processing method according to scope 1. (3) The perpendicular magnetic signal processing method according to claim 1, wherein at least one end of the main signal recorded on a track of the magnetic recording medium is erased by the tracking signal. (4=) The vertical magnetic head according to claim 1, wherein the position of the magnetic head with respect to the track is finely adjusted based on the tracking signal reproduced by the second main magnetic pole. Magnetic signal processing method.