JPS6236707A - Vertical recording and reproducing magnetic head - Google Patents

Abstract

PURPOSE:To stabilize the state and position of a winding and to reduce the variance of the head output by forming a parallel cross-shaped winding on the junction surface of a back core part and putting a recording/reproducing coil underwent previously the turn shaping into said winding groove. CONSTITUTION:A back core part 5 is formed with the soft magnetic ferrite, etc. and a parallel cross-shaped winding groove 13 is formed on the junction surface with a main magnetic pole member 2. A recording/reproducing coil 16 is previously wound into a pyramid shape and fixed by an adhesive so that it is fitted to the tip end part 5a which is not cut by the groove 13 of the part 5 and kept projected. Then the coil 16 is put into the groove 13 and fitted at the part 5a to be fixed at a prescribed position by means of an adhesive. Then the lead-out wires 16a and 16b of the coil 16 are put into guide grooves 14 and 14 and led out to the lower side. Then the remaining part of the surface where the groove 13 is formed is joined to the rear side of the member 2 by a resin adhesive. Thus a magnetic head is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular recording/reproducing magnetic head used in a perpendicular recording system, and particularly to the structure of a main pole excitation type magnetic head.

[Summary of the invention]

The present invention relates to a magnetic head for perpendicular recording and reproducing that is composed of a main pole member having a high-speed magnetic thin film and a back core portion made of a soft magnetic material bonded to its rear surface. By providing a shaped winding groove and fitting a pre-wound and shaped recording/reproducing coil into the winding groove, the winding condition and position are stabilized, and variations in head output are reduced. It is designed to be suitable for mass production.

[Conventional technology]

In recent years, a perpendicular recording method in which the recording medium is magnetized in the thickness direction has attracted attention as a method suitable for high-density recording (short wavelength recording).

In general, in the so-called longitudinal recording method, which records by magnetization in the direction of relative movement between the recording medium and the magnetic head, the self-demagnetizing field increases as the recording signal becomes shorter in wavelength, whereas in the perpendicular recording method, the principle is The shorter the wavelength, the smaller the demagnetizing field of recorded magnetization, which allows high-density recording.

However, for this purpose, a recording medium having anisotropy perpendicular to the film surface and a perpendicular recording/reproducing magnetic head that generates a magnetic field as perpendicular to the recording medium as possible are required.

FIG. 5 shows an example of a conventional perpendicular recording/reproducing magnetic head, which is a main pole excitation type magnetic head.

In the figure, 1 is a high magnetic permeability thin film made of permalloy, amorphous magnetic material, etc., and this thin film 1 is made of a soft material such as ferrite having a winding groove 3 with a non-magnetic material 7 such as glass bonded to the tip side. A magnetic core portion 9 composed of a magnetic material 8 and a winding groove 3'
It is held by a non-magnetic substrate 10 having a.

The recording/reproducing coil 6 includes a magnetic core portion S and a non-magnetic substrate 1.
During recording, a signal current is passed through this coil 6 to generate an excitation magnetic field, and this magnetic field produces a large number of perpendicular components from the tip of the high magnetic permeability thin film 1. A magnetic field can be generated.

As shown in FIG. 6(a), this perpendicular recording/reproducing magnetic head is constructed by joining a plate-shaped block 11 made of a non-magnetic material such as glass and a non-magnetic material block 12 having a winding groove 3' by glass welding or the like. to constitute a non-magnetic substrate 10, and the substrate 1
The side surface 10a of the sixth
A side surface 9a of a magnetic core portion S formed by bonding a plate-like block of a non-magnetic material 7 and a soft magnetic material 8 such as ferrite having a winding groove 3 by glass welding or the like as shown in FIG. The surface of the non-magnetic substrate 10 on which the high magnetic permeability thin film 1 is formed is adhered using an adhesive or the like, and finally the recording/reproducing coil 6 is attached.
It is made by winding a wire.

FIG. 7 shows an example of a main pole excitation type magnetic head previously invented by the present inventors, in which 1 is a high permeability thin film;
2 is a main magnetic pole member composed of a high permeability 1, a non-magnetic material 7° 7', and a magnetic introduction part 4 made of a triangular prism-shaped soft magnetic material; The back core portion 6 is made of a soft magnetic material and is a recording/reproducing coil.

As shown in FIG. 8(a), this perpendicular recording magnetic head has a back core part 5 made of a soft magnetic material such as ferrite in which winding grooves 3, 3 are formed parallel to the width direction of the head. After the recording/reproducing coil 6 which has been wound and shaped is inserted and fixed as shown in FIG.

The back core portion 5 and the main pole member 2 are manufactured by joining them with an adhesive or the like as shown in FIG. 6(c) (Japanese Patent Application No. 60-62587).

[Problem that the invention seeks to solve]

By the way, in order to obtain high recording and reproducing efficiency and stable head output in such a magnetic head for perpendicular recording and reproducing, it is necessary to bring a high magnetic permeability thin film and a magnetic core with low magnetic resistance close to each other to effectively obtain magnetic induction. , it is necessary to manufacture the head so as to eliminate variations in the winding state and winding position.

However, in the magnetic head with the conventional structure shown in FIG. Not only is it difficult to concentrate, but since the recording/reproducing coil 6 is wound last, it is difficult to keep the winding condition and position constant.

Therefore, as shown in FIG. 7, in order to strengthen the magnetic coupling between the magnetic core part and the high permeability thin film, the present inventors
He invented a magnetic head for perpendicular recording and reproducing which is provided with a magnetic introduction part 4 made of a soft magnetic material and further comprises a back core part 5 in which the main magnetic pole member 2 and the recording and reproducing coil 6 are inserted and fixed in advance. However, even in this magnetic head.

The winding condition is stable because it uses a coil that has been wound and shaped in advance, but there are still some points where it cannot be said that it has been sufficiently stabilized, such as side-to-side play when it comes to fixing the winding position.

Further, since the coil is larger than the width of the head, the main pole member 2 and the back core portion 5 must be joined for each head, which poses a problem that mass productivity is not good.

[Means for solving problems]

This invention was made to solve the above problems, and in a perpendicular recording/reproducing magnetic head as shown in FIG. A magnetic head is constructed by providing a cross-shaped winding groove on the joint surface side of the back core portion to be joined, and fitting a recording/reproducing coil which has been wound and shaped in advance into the winding groove.

[For production]

The coil fitted in the cross-shaped groove of the back core can be fixed from all sides with adhesive to the central part of the protruding tip left in the back core, so the winding position is stabilized and the winding Since the wires are wound and shaped in advance, the winding condition is also constant, and variations in head output can be extremely reduced.

In addition, since the coil does not protrude from the back core section, after fitting the coil into the back core section for multiple magnetic heads,
Furthermore, after joining the main magnetic pole members, it is possible to cut and separate them to produce a large number of magnetic heads at once, making the structure advantageous for mass production.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows 1. FIG. 7 is a perspective view showing an embodiment of a magnetic head for perpendicular recording and reproducing according to the present invention, in which the same parts as in FIG. 7 are given the same reference numerals.

Reference numeral 2 denotes a main magnetic pole member which is closer to the recording medium (not shown), and a triangular magnetism introduction part 4 made of soft magnetic ferrite or the like is attached to a non-magnetic material 7 made of glass or ceramics by glass mm or resin adhesion. A thin film 1 of high magnetic permeability such as permalloy or amorphous is formed by sputtering or the like on the side surface of the other similar non-magnetic material 7', and the surface of this thin film 1, 5 non-magnetic material 7 and the magnetic introduction part 4 are bonded together. The main magnetic pole member 2 is formed by joining the common side surface with the main magnetic pole member 2 by resin adhesion.

Alternatively, the high magnetic permeability thin film 1 may be formed on a common side surface of the nonmagnetic material 7 and the magnetism introducing portion 4, and the nonmagnetic material 7' may be bonded to the surface of the thin film.

On the other hand, the back core part S is formed of soft magnetic ferrite or the like, and a cross-shaped winding groove 3 is formed on the joint surface with the main pole member 2, as shown in FIGS. 2 and 3. (2) Two parallel guide grooves 14 for the coil lead wire are formed on the side surface.

In addition, a recording/reproducing coil 6 is pre-coated by a winding machine (not shown) so as to match the tip central portion 5a which remains in a protruding shape without being cut off by the winding AIW 113 of this back core portion 5.
It is rolled into a rectangular tube and secured with adhesive.

Then, this coil 16 is inserted into the winding groove 13 of the back core portion 5.
, fit it into the center portion 5a of the tip, and fix it in place with adhesive. And the drawer atsa of the coil 16,
16b into the guide groove 14.14 and pull it out downward.

Thereafter, the remaining portion of the surface of the back core portion 5 on which the winding groove 13 is formed is bonded to the rear surface of the main pole member 2 by resin adhesion or the like to complete the magnetic head.

According to this embodiment, as can be seen from FIG.

The coil 16 is in the winding #I groove 1 of the back core part 5! Since it is fixed with adhesive from all sides to the center portion 5a of the tip within I, one winding n is stabilized, and at the same time, the lead wire of the coil 16 can be easily drawn out by the guide groove 14.

FIG. 4 is a diagram for explaining that the magnetic head according to the present invention is suitable for mass production.
! After continuously forming a large number of A grooves, and inserting and fixing pre-wound and shaped recording/reproducing coils into the respective predetermined windings 15FR, each back core portion 5 is cut and separated at the position shown by the dashed-dotted line. This allows the winding process to be mass-produced.

Furthermore, in the above cutting process, the main liI pole member 2 is also formed continuously corresponding to the block 15, and
This may be done after bonding with an adhesive or the like, thereby further increasing productivity.

In addition, in this embodiment, the back core section 5 has a sufficient volume because it is entirely formed of a soft magnetic material, and since the main magnetic pole member is provided with the magnetic introduction section 4 made of a soft magnetic material, during recording, Magnetic flux flows efficiently from the tip of the back core part 5 to the high magnetic permeability thin film 2, and a strong magnetic field with a large vertical component can be generated at the main pole tip, compared to the conventional example shown in FIG. Recording and reproducing efficiency is significantly improved.

Actually, the magnetic head is completed by chamfering the left and right ridges of the front surface (magnetic medium side) of the main pole member 2 from the state shown in FIG. Furthermore, if the recording medium is a hard disk, the tip of the magnetic head is slightly moved during recording and reproduction.

In the case of tape, since there is contact, it is desirable to chamfer the tip of the magnetic head, that is, the front surface of the main pole member 2 into a convex shape to reduce the contact area.

〔Effect of the invention〕

As described above, in the perpendicular recording/reproducing magnetic head according to the present invention, the winding state and winding position of the recording/reproducing coil are stabilized, and variations in head output are reduced. In addition, since the coil does not protrude from the back core portion, a large number of magnetic heads can be manufactured at once using a single block and then cut and separated, resulting in good mass productivity.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a perpendicular recording/reproducing magnetic head showing an embodiment of the present invention, and FIG. 2 is a perspective view of only the back core portion thereof. Fig. 3 is a plan view of the recording/reproducing coil fitted into the winding groove of the back core part, Fig. 4 is a plan view showing an example of manufacturing the back core part, and Fig. 5 is a plan view of the conventional back core part. A cross-sectional view of a magnetic head for perpendicular recording and reproducing, FIG. 6 is a perspective view showing the manufacturing process thereof, FIG. 7 is a perspective view showing the other side of the conventional magnetic head for perpendicular recording and reproducing, and FIG. 8 is a similar view of its manufacturing process. It is a figure showing a process. 1... High magnetic permeability thin film 2... Main magnetic pole member 4... Magnetism introduction part 5... Back core part 7.7'...
Non-magnetic material 13... Winding groove 14... Guide groove
1 day...Recording/reproducing coil Figure 1 Figure 2 Figure 3 Figure 5 Cause Figure 6 Figure 7 Figure 8 Procedure correction? (White side, July 29, 1988, Commissioner of the Japan Patent Office, Black 1) Mr. Yu Akira1, Indication of the case, Patent Application No. 175407/1982, Title of the invention: Magnetic head for perpendicular recording and reproduction 3, Person who makes corrections and Relationship Patent applicant: Akai Denki Co., Ltd., 2-12-14 Higashikojidani, Ota-ku, Tokyo (002)

Claims (1)

[Claims] 1. Perpendicular recording composed of a main pole member having a high magnetic permeability thin film on the side closer to the recording medium, and a back core part made of a soft magnetic material bonded to the rear surface of the main pole member. In the reproducing magnetic head, a cross-shaped winding groove is provided on the joint surface side of the back core portion with the main magnetic pole member, and a recording/reproducing coil that has been wound and shaped in advance is fitted into the winding groove. A perpendicular recording/reproducing magnetic head characterized by: 2. Claim 1, characterized in that the back core portion has a guide groove for a lead wire of a recording/reproducing coil on a side surface thereof.
A magnetic head for perpendicular recording/reproduction as described in .