JPS5914112A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To increase the recording density, by picking up only the signal right under a head at the time of reproduction and aboiding dispersion of recording magnetic fluxes in at the time of recording after laminating a shielding member to the side surface which decides the head thickness. CONSTITUTION:A shielding member 2e made of a nonmagnetic material, etc. is adhered to both side surfaces in the direction of thickness 2c which decides the width of a magnetic recording track near a gap 2a of a magnetic head 2. A spacer 2d can use either plastic or an adhesive, etc. and usually has a space slightly larger than the gap between a magnetic disk 3 and the head 2. As a result, the head 2 performs magnetic recording to the disk 3 within a range of about thickness 2c. Furthermore the crosstalk can be prevented since only the signal right under the thickness 2c of the head 2 is picked up substantially even at the time of reproduction. Thus, the space between tracks is reduced and the recording density is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating magnetic head device used in a recording/reproducing device having a rotating magnetic medium.

Due to the need to increase the recording density of magnetic disks, there is a demand to narrow the interval between recording trunks as much as possible. However, in reality, due to machining errors and temperature effects, it is not always possible to position the head correctly at the center of the desired track.
During playback, there is a cross pickup that picks up the signal from the adjacent track.
This causes talk, and during recording, the diverging magnetic flux for recording also affects the position of the adjacent track.

In view of the above, the present invention attempts to improve the recording density and simplify the work.By laminating a shielding member on the side surface that determines the thickness of the head, it is possible to eliminate noise signals during playback. It picks up only the signal directly below the head, and prevents the magnetic flux for recording from being dispersed during recording.

The drawings will be explained in detail below. - FIG. 1 is a schematic perspective view showing the state in which the floating magnetic head of the present invention is used. A magnetic head 2 supported by a gimbal 1 has a magnetic disk 6
It floats while maintaining a minute gap of less than 1 μm,
The solid line 4 is the trunk being played, the dotted line 5 is the inner adjacent trunk, and the two-dot chain line 6 is the outer adjacent trunk.

FIG. 2 is a wedge-shaped graph of the voltage induced in the coil 2a of the magnetic head 2 by the signal magnetic flux from the magnetic disk 6. In FIG. The straight Y-axis 7 is the trunk 4 being played, the dotted Y-axis 8 is the inner adjacent trunk 5, and the two-dot chain Y-axis 9 is the outer adjacent trunk 9.
, and the height in the Y-axis direction indicates the induced voltage. If the magnetic head 2 is shifted to the straight line 10 in the inner circumferential direction, the output signal will be 10a by the difference between the required curve 7a and the noise signal 8a from the inner adjacent track 5, and the signal separation and increase 1] becomes a problem.

FIG. 3 is an enlarged perspective view of the conventional magnetic head 2 viewed from the bottom side. 2a is a gap, and 2b is a coil.

FIG. 4 is a model drawing of the situation when the conventional magnetic head 2 records on the magnetic disk 6. coil 2b
The magnetic flux 11 generated by the magnetic flux 11 is written into the desired track 7, and at the same time, some of the leakage magnetic flux is transferred to the adjacent l/rack 8.
9 is also written as a noise signal.

Figure 5 is a model of a conventional playback situation. At the same time as the desired magnetic flux signal is obtained from the selected track 7, the signals from the adjacent tracks 8.9 are also picked up, resulting in noise. If the position of the magnetic head 2 with respect to the track 7 is not old, noise increases rapidly.

FIG. 6 is an enlarged perspective view of the magnetic nozzle 2 seen from the bottom side, showing an embodiment of the present invention. A shield member made of a material with high magnetic permeability is provided on both side surfaces in the direction of thickness 2c that determines the inside of the magnetic recording track near the gear knob 2a, with a spacer 2d made of a non-magnetic material or a material with low magnetic permeability interposed therebetween. 2e is fixed. The spacer 2d may be made of metal such as copper or brass, or may be made of plastic, adhesive, or the like. It is sufficient to provide a slight gap from the main body of the magnetic head 2, and it is usually preferable to make the gap slightly larger than the gap between the magnetic disk 6 and the head 2.

The spacer 2d and the shield member 2e can be made by pasting, or by using vapor deposition or printing cladding material. Also, the size of the shield member 2e may be made larger, but it is at least as large as a gear.

Do not cover the area near the pin 2a where the magnetic flux passes.

FIG. 7 is an explanatory diagram of the principle of reproduction according to the present invention.

The signal of the selected track 7 is picked up by the head 2. Noise signals from adjacent tracks 8 and 9 are removed by shielding member 2.
e and is deflected, eliminating or reducing the effect.

In the case of recording, the magnetic flux generated in the magnetic head 2 is shielded from the leakage magnetic flux that tries to diverge by the shield member 2e.
It becomes magnetized by passing almost directly under it.

As described above, according to the present invention, the magnetic head 2 has a thickness of approximately 2
Since magnetic recording is performed on the magnetic disk B within the range of 2c, and during playback, the magnetic head 2, which has a thickness of 2c, picks up only the signal directly below V, so cross talk can be prevented and the distance between tracks can be reduced. Increase the density by increasing the spacing. From another perspective, it also has the effect of widening the permissible bias error range for the track.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the state in which the magnetic head of the present invention is used;
Fig. 2 is a horizontal graph of the induced voltage of the magnetic head, Fig. 3 is a perspective view of a conventional magnetic head, Fig. 4 is an explanatory diagram of the recording state of the conventional magnetic head, and Fig. 5 is a diagram of the reproducing state of the conventional magnetic head. Explanatory drawing, FIG. 6 is a perspective view of the magnetic head of the present invention, and FIG.
The figure is an explanatory diagram of the case of reproduction according to the present invention. 2... Magnetic head 2 a --- Gap 2c... Thickness 2d-... Spacer 2e
・・・・・・Shield member Fig. 1 Fig. 2 Fig. 4

Claims (1)

[Claims] 1. A floating magnetic head device used for a magnetic disk, a magnetic drum, etc., characterized in that a magnetic shielding member is fixed to the side surface in the thickness direction that determines the trunk width for magnetic recording and reproduction near the gap of the head.