JPS63103403A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the mechanical strength of a center rail and to reduce deteriora tion in the quality of a reproduction signal, by providing a gap part which regulates a recording and reproducing track width within the rail width of the center rail having a medium track width larger than that of a floating slider. CONSTITUTION:Width W2 on a core inflow end 31a side for a medium traveling direc tion at the gap 34 part is formed larger by 1-5mum than width W1 on a core inflow end 33a which regulates a confronting reproducing track width. Therefore, when a bit of information is recorded on a magnetic disk medium, normal recording is performed on the core inflow end 33a side for the medium traveling direction with narrow width at the gap part 34, however, at this time, a considerably strong leakage magnetic field is generated at the gap facing plane of the core outflow end 3a with wide width confronting with the core inflow end 33a interposing the gap 34, thereby, the medium is magnetized. Also, since the reproduction of the bit of information is performed on the core inflow end 33a side with narrow core width, it is possible to record the bit of information in wide track width, and to reproduce it in the track width smaller than the above track width. In this way, the deterioration in the quality of the reproduction signal by a thermal off track can be remarkably reduced.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a gap portion that defines the recording/reproducing track width in a monolithic magnetic head used in a magnetic disk drive, etc. by forming a center rail having a width wider than the medium track width of a floating slider. In addition to improving the mechanical strength of the center rail by providing it within the rail width,
By recording information on a magnetic disk medium with a wide track width and reproducing the information with a narrow track width, deterioration in reproduced signal quality due to thermal off-track is reduced, making it possible to increase track density. It is.

[Industrial application field]

The present invention relates to a magnetic head used in a magnetic disk device, etc., and more particularly to a structure of a recording/reproducing gap in a monolithic type magnetic head that integrates a head core made of high magnetic permeability ceramics and a floating slider.

In magnetic disk drives, monolithic magnetic heads are most commonly used, in which a head core made of a high permeability magnetic material and a floating slider are integrated.

Recently, the demand for magnetic recording media has increased.2. With the increase in processing density, recording/reproducing trunks have also become extremely dense, and track widths of 20 μm or less have become available. For this reason, a monolithic magnetic head that can cope with high trunk densities can be used without reducing the mechanical strength of the structure and without deteriorating the quality of the reproduced signal even if there is some head positioning error with respect to the media track. There is a demand for something that can provide fewer characteristics.

[Conventional technology]

In the conventional monolithic magnetic head, as shown in the perspective view of FIG. 5 and the partially enlarged perspective view of FIG. A wound head core portion 11 made of, for example, Mn-Zn ferrite and a similar Mn4n
A recording/reproducing gap portion 14 is formed by bonding a slider block made of ferrite with a glass adhesive 13 or the like, and a sight rail having an air bearing surface is formed by mechanically grinding the bonded slider block. 16 and a center rail 17 having a medium facing rail width that defines a predetermined track width W including the recording/reproducing gap 14.
[Problems to be Solved by the Invention] Incidentally, in the conventional monolithic magnetic head, since the track width W is defined by the medium facing width of the center rail 17, the height As track density increases, that is, tracks become narrower, the width of the center rail 17 facing the medium also becomes narrower, resulting in a decrease in mechanical strength.

Also, since recording and playback are performed using the same magnetic head, recording and playback are performed using the same magnetic head.
Due to environmental temperature changes such as temperature changes immediately after the device starts up during playback and during steady operation, the position of the magnetic head relative to the media track slightly shifts, resulting in so-called thermal off-track, which is caused by unerased noise from the old data number δ. There was an inconvenience that the reproduced signal quality deteriorated.

When such a thermal off-trunk becomes most noticeable and the reproduced signal deteriorates, the recording head is exposed to a thermal Information signal B is recorded overlappingly in area 22 by off-track, and when reproducing this information signal B next time, the reproducing head reproduces information signal B at the position on track 21 where the information signal A was recorded. Situations such as this occur.

Therefore, when recording the information signal B in an overlapping manner in the above-mentioned area 22, if there is an ability to erase even a little of the information signal A in the off-track portion of ΔX, which has a large write smear on the side, the above-mentioned off-track override can be performed. However, with current magnetic disk drives, it is extremely difficult to control this thermal off-track to 2 μm or less.

In view of the above-mentioned conventional circumstances, the present invention improves mechanical strength by making the width of the center rail facing the medium wider than the width of the recording/reproducing track, and also records information in a wide width on the medium track. The object of the present invention is to provide a novel monolithic magnetic head that can reduce deterioration in reproduced signal quality due to thermal off-trunk by reproducing recording in a narrow width.

[Means for solving problems]

In order to achieve the above object, the present invention has a head core portion 3 made of high magnetic permeability ceramics as shown in the principle diagram of FIG.
1 and the floating slider 33, the width W2 on the core outflow end 3Ia side with respect to the medium running direction shown by arrow A is wider than the width W on the core inflow end 33a side that defines the opposing reproduction track width. In addition to widening it by 1 to 5 μm,
Recording/reproducing track width W, , W2 of the 34 gaps
is provided within the rail width Wc of the center rail 39 of the floating slider 33.

[Effect]

In the magnetic head of the present invention, the width W2 on the core outflow end 31a side with respect to the medium running direction at the gap 34 portion is formed to be 1 to 5 μm wider than the width W on the core inflow end 33a side that defines the width of the opposing reproduction track. Therefore, when recording information on a magnetic disk medium, normal recording is performed on the core inflow end 33a side with respect to the medium running direction where the core width is narrow at the gap 34 portion, but at this time, as shown in the figure, A fairly strong leakage magnetic field is generated on the gap-facing surface of the wide core outlet end 31a, which faces the core inlet end 33a through the gap 34, and the medium is magnetized.

Furthermore, the information is reproduced from the core inflow end 33 having a substantially narrow core width.
Since reproduction is performed on the a side, it is possible to record with a wide track width and reproduce with a narrower track width. Therefore, deterioration in reproduced signal quality due to thermal off-track is significantly reduced.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a perspective view showing an embodiment of the magnetic head according to the present invention, with the medium facing surface facing upward to make the structure easier to understand.

In the figure, 31 is a head core made of high magnetic permeability ceramic, such as Mn--Zn ferrite, around which excitation coil 32 is wound, and 33 is a floating slider made of high magnetic permeability ceramic as well.

As shown in the partially enlarged perspective view of FIG. 3 and the partially enlarged plan view of FIG. 4, the gap 3 of the floating slider 33 is
The core end 33a on the inflow side in the medium running direction shown by the arrow A constituting 4 has a narrow core width W, and the core end 31a on the outflow side of the helad core section 31a opposite thereto has a narrow core width W of the core end 33a. Core width W.

(Sendus t) which has a core width W2 about 1 to 5 μm wider than the core width W2 and a high saturation magnetic flux density.
A magnetic film 35 made of the like is formed by being deposited by a vapor deposition method, a sputtering method, or the like.

Further, the head core portion 31 having the core end 31a with the narrow core width W1 and the floating slider 33 having the core end 33a with the wide core width Wt are integrated by a glass adhesive 36, and the glass adhesive 36 A gap 34 is provided.

Further, such a floating slider 33 is provided with a sight rail 37° 38 having a floating surface and a center rail 39 having a rail width W wider than the track width W including the gap 34 portion by a mechanical grinding process. ing.

In the monolithic magnetic head constructed in this way, information can be recorded in a relatively wide width by the gap 34 formed by the core end 31a having the narrow core width W1 and the core end 33a having the wide core width WZ, and Since narrow width reproduction is possible, deterioration in reproduction signal quality due to thermal off-track of the magnetic head is reduced.

Further, the medium facing width of the center rail 39 of the floating slider does not need to be made equal to the narrow track width, and can be made wide, thereby preventing a decrease in mechanical strength.

Furthermore, since the gap 34 is made of a magnetic film 35 made of sendust having a high saturation magnetic flux density, it is difficult to record 1000 kHz with conventional ferrite heads.
High-density recording and reproduction on magnetic disk media with high coercive force exceeding 0e is also possible.

〔Effect of the invention〕

As is clear from the above description, according to the magnetic head according to the present invention, information can be recorded on a magnetic disk medium with a wide track width, and the information can be reproduced with a narrow track width. , deterioration in reproduced signal quality due to thermal off-track is significantly reduced, and since there is no need to narrow the width of the center rail facing the medium in accordance with the narrow track width, deterioration in mechanical strength is eliminated, etc.
It has an excellent advantage of being able to handle high track density, and is extremely advantageous when applied to this type of monolithic magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining the principle of the magnetic head according to the present invention, FIG. 2 is a perspective view showing an embodiment of the monolithic magnetic head according to the present invention, and FIG. 3 is a plan view for explaining the principle of the magnetic head according to the present invention. FIG. 4 is a partially enlarged perspective view showing the structure of the gap portion of the magnetic head according to the present invention; FIG. 4 is a partially enlarged plan view showing the structure of the gap portion of the magnetic head according to the present invention; FIG. FIG. 6 is a partially enlarged perspective view showing the gap portion of a conventional monolithic magnetic head. FIG. 7 is an explanatory diagram of off-track override. In FIGS. 1 to 4, 31 is a heft core portion, 31a and 33a are core ends, and 32
is an excitation coil, 33 is a levitation slider, 34 is a gap,
35 is a magnetic film, 36 is a glass adhesive, 37, 38 is a sight rail, and 39 is a center rail. 7 Neg Saeyu Motoyuki, target source 'ff G1 Inmei' f Jf power 1st illustration g shameful parrot σ 19 its month 7J investigation required figure 2 figure 3 dormitory remembrance - /7. +1 Ebisu 11 shares to friend stick Fig. 4 Aberration 4'l'J & Utsukei Kojiro's Fig. 5 Juto Palmer lf part 9 Rimou 7) Hanairi oblique figure Fig. 6 Surf Luo 7 to 474 Origa m Figure 7

Claims (2)

[Claims] (1) Head core made of high permeability ceramics (3
1) and the floating slider (33) with a gap (
34) A magnetic head integrated with a core inflow end that faces the width of the core outflow end (31a) with respect to the medium running direction at the gap (34) that defines the recording/reproduction track width. (33a) 1 to 5 μm wider than the width on the side
A magnetic head slider characterized in that the gap (34) is widened and the recording/reproducing track width of the gap (34) is provided within the rail width of the center rail (39) of the floating slider (33). (2) The magnetic head as set forth in claim (1), wherein the portion constituting the gap (34) portion is made of a magnetic material with a high saturation magnetic flux density.