JPS59154624A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the reliability by forming a bulk-shaped magnetic substance between a nonmagnetic substance and a thin film magnetic core allow the magnetic head to cope with low cost and high track density. CONSTITUTION:A recording/reproducing gap 13, thin film magnetic cores 14, 16, an erasing gap 18 and a nonmagnetic substance 20 are provided between the bulk-shaped magnetic cores 11 and 12. Bulk-shaped magnetic substances 31, 32 are formed respectively between thin film magnetic cores 15, 16 and a T-shaped nonmagnetic substance 20 along the running direction of a recording medium. The thickness of the nonmagnetic substance 20 is nearly 200-300 microns and nearly 700 microns near a gap. Through the constitution, a magnetic field required for the magnetization of the recording medium having several hundred Oersteds of coercive force is generated at the gap. The lamination of each magnetic head is not required thereby reducing the cost, and the clearance between the recording/reproducing gap and the reasing gap is controlled in the order of several microns.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel eye type magnetic head,
The purpose of the present invention is to provide a simple configuration, b.
The purpose of Sen is to make it possible to reduce costs.

General ((L/Nel erase type magnetic head)
It is called ``Life''(T'F I) and is used for +). FDDfdWinbuesta type no\-do f isk dry life (hereinafter FND'l) and (expose)
However, disk compatibility 1'1 is required in the past. Therefore, as shown in the conventional example of No.
・F is 41. For example, when a certain FD'l) writes extra data into the recording medium, the data is played back by pressing the floppy disk on the recording medium. In this case, it is difficult to position the head accurately, and the mechanical commutation between the rack and F-V is difficult.
If the written data remains, Wfl, < tatami or fl data take 1 by meft track to the magnetic field.
It mixes in as noise during the 4th generation. Also, within the same FDD, off-track occurs due to tolerances caused by the heat ζ of the Enoki structure or a recording medium. Therefore, when writing new data on all 81 recording media, it is necessary to always erase the recording data D Ryokawa ID.・
Nodo is using it. 1 is the 11' recording/reproducing nozzle, 2 and 3 are the erasing nozzles, and 6 is the recording/reproducing gear.

4 and 5 i-tq, "record data tag)" erase gear knob for erasing both leads, 7.8 and 90 ceramics. Excitation coil, back bar or d slider etc. are not described here. As is clear from this example, lamination of the erase head and the recording/playback head is carried out for each individual head. Then, the cost of the magnetic head accounts for a very large portion of the entire drive.
I) also from 8 inch size to 5 inch size, and -3
Although the size of the rad core is becoming smaller and smaller, and the track density is becoming higher and higher, the conventional example shown in Fig. 1 is no longer possible.The thickness of the rad core is considered to be about 50 microns as the limit for mass producers, and the track density per inch is The limit is 200 tracks. The gap tolerance between the sharp recording/reproducing gear knob and the erasing gear knob is as much as 50 microns, and the azimuth of the recording/reproducing gear knob is designed to eliminate the inner ring difference between the recording/reproducing gap and the erasing gear. The control also produces an error of i5 minutes N[years in terms of the gamma angle.

The present invention eliminates the drawbacks mentioned above, and will be described in detail below with reference to the drawings.

FIG. 2 shows the basic structure of the embodiment of the present invention, and is a plan view seen from the recording medium side, in which the traveling direction of the recording medium (d is from left to right on the paper surface. 51 is the recording/reproducing pano 1', 521 −
It erases the throat, 11 and 12) (lucky magnetic core, 131d distribution 11 + raw gear knob, 14 and 16)
2 is a thin film magnetic core, 18 erase gaps, and 20 is a nonmagnetic material.

FIG. 6 shows an embodiment of the present invention, and is a plan view of the magnetic head viewed from the side. 3j:i, - and 32V1
Bano I trigonal magnetic material, 20 irt non-magnetic material, 14 trigrams and 16 are m-shaped magnetic cores, -17, 11 trigrams and 12B Bakker-shaped magnetic cores, 13 and 181-j are respectively recording and reproducing gears.
These are the knob trigram and the erase gap. In (a), a convex non-magnetic bibulk-like magnetic material is formed along the direction of the i=row, and a thin magnetic core is further formed (2, -1
，? :+. , lN1Fl property (, lo thickness is 200~3
[ ]0 micron, 7006 near the gear knob
In 6(b), where the angle is c1nb'' degree, the non-magnetic material 20 is the number 1 [
] M)) C7 is inserted, and another non-magnetic material 7IO is formed near the gear knob. (() is a non-magnetic material of 700 microns (1 g of 'I').A thin 11th magnetic layer is formed on the 0+, and a bulk magnetic material is formed on the (-)2). With only a thin film magnetic core, magnetic saturation occurred and it was not possible to obtain a sufficient magnetic field at the gear knob, but by using t'i771FM as in this example, it was possible to create an arrangement with a coercive force of several hundred degrees at the gear knob. It is capable of generating the magnetic field necessary to magnetize the recording medium.

Fig. 4 (d) is a perspective view of (l+) in Fig. 6, and the pattern of thin lI@magnetic core is shown on the right side 1. The gear rough part is
It can be formed by vapor deposition of 5zlo, etc. The manufacturing method of the magnetic head in which 1 and l= are shown in FIG.
k-1'. All//) Parts td fii-1 If the recording medium is good in the radial direction, it is 1~, - scratches 50 millimeters y2
Glass-based 1-20 K medium transfer 111 Along the y1 direction, force both sides, ra < 4, apply the ceramic plate 30 from the V body and sand body sides with adhesive. Laconate (7. Polish the layer 111 that forms the thin film magnetic core. After this polishing, form a thin film 1n on the coated surface, and then polish the laconate (14 and 16).
From gf, form lii+ru. On the other hand, a gear knob member is formed on the curved magnetic Ut gol'.
1 IlJth fii 1K *k h] -) -Kit. 7) Afterwards - Fly - one by one with the jig 7) Grind the throat to the desired +'7 to the magnetic 7 Z, .

In this way, in the Ming Dynasty, individual magnetism...
・No need to relaminate the throat 5, and the cost can be reduced by going to the throat Vcst in Figure J1. ．． 2. .

Furthermore, the distance between the HFi recording/playback gear knob and the erase gear knob can be controlled on the order of several microns. Regarding the inner ring difference between Cζ recording/reproducing 11mm and erasing head, ',
j4i:j-F6 can be erased by adjusting the dimensions of the convex or concave portion of the handshake 16 to an appropriate value. This part can be formed by fumetoe notching, as opposed to the conventional two-way machining method, so the dimensional accuracy is extremely high.

Furthermore, since the medium heat part is made of non-magnetic material, there is extremely little interference between the MjW recording/playback half-playback nozzle and the erase head, and all problems such as bit asymmetry, peak shift, and crosstalk from the erase head to the playback head during playback are minimized. , it could be reduced compared to the conventional henode.

As described above, according to the present invention, it is possible to obtain a highly reliable henobi that can respond to lower costs and higher track density.

Note that the head of this embodiment can be applied not only to conventional longitudinal recording but also to perpendicular recording.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional embodiment. FIG. 2 shows the head slider surface of an embodiment of the present invention. FIGS. 6(a), 6(b), and 6(c) are plan views of an embodiment of the present invention. FIG. 4 is a perspective view of the first view (b). 1... To recording/playback... Throat 2.3... Erasing head 4.5... Erasing gear knob 6... Recording head 1 raw gap 7, 8.9... ... Ceramic 11.12 ... Bulk magnetic core 13 ...
・Recording/reproducing gap 14, i6...Thin film magnetic core 18...Erase gear knob 20.30...Non-magnetic material 51.32...Bulk magnetic material"2 applications Shikiwa Sei T-sha Co., Ltd. Figure 2, Part 3

Claims (2)

[Claims] (1) In the direction of the advancing force of the recording medium, a thin simulated magnetic core γ is formed on both sides of the non-magnetic material, and the thin film magnetic core and the bulk magnetic core form a ring-shaped M[4 recording/reproducing device. A magnetism characterized in that a bar/L-shaped magnetic material is formed between the non-magnetic material and the thin-film magnetic core in the magnetic head constituting the hennode and the erasing head, l'. (2) Thin-film magnetic cores are formed on both sides of the non-magnetic material in the erase direction (Vcf) of the recording medium, and the thin-film magnetic cores and the ring-shaped magnetic core form a ring-shaped recording [1+raw-shaped erase head]. In a magnetic head comprising 1&, the front 81
A thin simulated magnetic core is placed between the non-magnetic material and the bar-like magnetic material in the pre-bath Vr, form II! A magnetic head with a characteristic of %.