JPH0227724B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head that records signals by forming residual magnetization in the thickness direction of a magnetic recording medium. This invention relates to a type magnetic head and its manufacturing method.

Recently, perpendicular magnetization recording has been attracting attention, in which residual magnetization is formed in the thickness direction of a magnetic recording medium, that is, in the perpendicular direction to record signals with excellent short wavelength characteristics. In particular, a so-called main pole excitation type, in which a main pole made of a high permeability magnetic thin film directly involved in signal recording is directly excited, is expected to be practical. Figure 1 shows the basic configuration of this type of magnetic head, in which the end of the magnetic head faces the recording surface (magnetic surface) of a magnetic tape 1 as a magnetic recording medium that is driven to run in the direction of the arrow. A side high permeability magnetic member 3 is bonded to the film surface of the main pole 2 made of a high permeability magnetic thin film,
The structure is such that the main magnetic pole 2 is excited by an excitation coil 4 wound around the tip of the main magnetic pole 2 via the same member 3. The member 3 is intended to improve the recording efficiency of the head, and its effects are well known.

However, although this type of head has been introduced in many documents, no specific head structure has been proposed, and the actual situation is that it has not been put to practical use. Furthermore, no proposals useful for practical use have been made regarding the structure of the main magnetic pole 2 in the track width direction, the winding process of the excitation coil 4, etc., and there are still many problems in terms of durability and reliability of the magnetic head. It was hot. Moreover, there are many problems in easily manufacturing this type of perpendicular magnetization type magnetic head with good mass productivity.

The present invention was made in consideration of the above circumstances, and
The object is to provide a perpendicular magnetization type magnetic head having a simple, durable, highly reliable and practical structure, and a method for manufacturing the same.

That is, the present invention enables highly reliable use without causing accidents such as disconnection or short circuit of the excitation coil.The present invention uses a non-magnetic holder to hold and fix the magnetic pole, and also reduces the width of the non-magnetic holder. The above object is effectively achieved by employing a head structure in which the magnetic pole constituent members except the magnetic pole head surface are buried inside the non-magnetic holder by making the head wider than the magnetic pole.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a partially exploded perspective view of the head with this structure, and FIG. 3 is a perspective view showing the completed state.

The first and second nonmagnetic holders 11 and 12 are made of glass, ceramic, or the like, and are rectangular parallelepipeds having an end face width wider than the tape width of the magnetic tape 1, which is a magnetic recording medium. These non-magnetic holders 11,
The outer portions of the tapes 12 that serve as the sliding end surfaces are formed into curved surfaces, so that when these are overlapped, the side surface shape becomes a so-called semicylindrical shape. The inner surface of the first non-magnetic holder 11, which becomes the joint surface, is formed thin except for the vicinity of the tip, and a groove 11a is formed at a position close to the vicinity of the tip. This groove 11a functions as a wire for winding an excitation coil, which will be described later. A side surface high permeability magnetic member 13 made of, for example, MnZn ferrite is joined along the length direction of the holder 11 to the center of the thin side surface portion of the holder 11.
The surfaces extending from the holder 11 to the side surface near the tip of the holder 11 are made to be the same plane. A high permeability magnetic thin film made of permalloy or the like having a width that defines the track width for the recording tape 1 is closely formed at the center of this surface, thereby forming the main magnetic pole 14. In other words, the main magnetic pole 14 has a structure in which the vicinity of its tip is joined to the side surface of the first non-magnetic holder 11, and the remaining region is joined to the first non-magnetic holder 11 via the side high permeability magnetic member 13. There is. Further, the side surface high permeability magnetic member 13 is wider than the main magnetic pole 14, and the first non-magnetic holder 11 is also wider than these, and the three members are aligned with each other at their center positions.

In the vicinity of the tip of the main pole 14, a wire is wound through the hole formed between the groove 11a and the member 13 through the side surface high permeability magnetic member 13, and is excited. A coil 15 is provided. The electrode leads of this excitation coil 15 are led along the side member 13 to the bottom surface facing the tape sliding surface, and are connected to electrode terminals 16 provided on the bottom surface. On the other hand, the second non-magnetic holder 12 is connected to the groove 1 of the first non-magnetic holder 11.
A groove 12a is provided in a portion facing 1a, and an adhesive 17 is applied to this groove 12a and the entire inner surface. The second non-magnetic holder 12 is
It is adhesively fixed to the first non-magnetic holder 11 with the main magnetic pole 14 etc. in between under appropriate pressure. Therefore, as shown in FIG. 3, the first and second non-magnetic holders 11 and 12 are attached to the main pole 14, around which the excitation coil 15 is wound, with only the tip, which is the head surface, of the main pole 14 exposed. High permeability magnetic member 13
, and the surrounding area is filled with adhesive 17 to hold it. That is, the main magnetic pole 14, the side high permeability magnetic member 13, and the excitation coil 15 wound around these are sandwiched between the first and second non-magnetic holders 11 and 12 and embedded with the adhesive 17. It becomes the head of the structure. Then, the non-magnetic holders 11 and 12 are firmly fixed with adhesive 17. Note that, for example, epoxy or the like is used as the adhesive 17.

According to the head having such a structure, the main pole 14 made of a magnetic thin film is firmly held by the non-magnetic holders 11 and 12, so that it is not strong against the stress that is applied when it comes into sliding contact with the running tape 1. Yes, it has high mechanical strength. Moreover, the non-magnetic holders 11 and 12
Since the edge portion of the main magnetic pole 14 is held in a sanderch structure, the straightness of the sharp edge is not disturbed, and it has excellent durability against abrasion. Therefore, it maintains excellent short wavelength recording characteristics and can be used for a long period of time.
Also, compared to the main magnetic pole 14, the non-magnetic holders 11 and 12
Since the width of the magnetic tape 1 is wide, the magnetic tape 1 can be smoothly attached to the main magnetic pole 14.
The magnetic tape 1 is guided by the edge of the magnetic tape 1, and also has the effect of preventing the tape from hanging on the main magnetic pole 14, thereby preventing damage to the magnetic tape 1. Furthermore, the excitation coil 15 is likely to be short-circuited or disconnected by peeling off the coating of the wire, but since it is embedded in the layer of adhesive 17 between the non-magnetic holders 11 and 12, the above-mentioned This has the effect that there is no risk of an accident.

Next, an example of the method for manufacturing the magnetic head of the present invention will be explained.

First, a narrow side surface high permeability magnetic member 13 is embedded in the first nonmagnetic holder 11 in which a winding groove 11a and a side surface high permeability magnetic member 13 is embedded by glass bonding. The surfaces of the member 13 and the non-magnetic holder 11 are subjected to a process of making them flush, for example, a polishing process. Thereafter, a magnetic thin film such as permalloy having a width narrower than that of the non-magnetic holder 11 having a desired track width is closely formed on that surface by sputtering, electroplating, or the like. At this time, it is advantageous to form a film of titanium (Ti) or the like on the above-mentioned surface in advance, and to form the main magnetic pole 14 by closely forming the high permeability magnetic thin film on this film, since this can prevent its separation. still,
The track width of the main pole 14 may be set using a mask or by etching. Thereafter, the excitation winding 1 is inserted into the groove 11a and connected to the main pole 14 via the side member 13.
5 is wound, and the second non-magnetic holder 12 is adhesively fixed with an epoxy adhesive 17 between them. At this time, the electrode terminal 16 is fixed to the bottom surface of the non-magnetic holder 11 with the adhesive 17, and the excitation coil 1
Connect the electrode leads in step 5. Thereafter, the sliding contact surface of the magnetic tape 1 is curved into a so-called semicylindrical shape to complete the head structure.

As described above, this head can be manufactured very easily without requiring any special manufacturing techniques, and its mass productivity is also high. Moreover, the excitation coil 15 is attached to the main magnetic pole 14.
After winding, these are buried and held, so handling of the members is easy, and problems such as disconnection of the excitation coil 15 do not occur when processing the curved surface of the tape sliding surface. Therefore, a dramatic improvement in manufacturing yield can be expected.

Note that the present invention is not limited only to the above embodiments. For example, the thickness and width of the main pole, the shape and dimensions of the non-magnetic holder, etc. may be determined in accordance with the specifications required for the magnetic head. Further, each material/material quality may be determined in the same manner. Further, in the embodiment, a one-head, one-channel type is illustrated, but the same can be applied to a one-head, multi-channel type or a multilayer structure composite type. Further, side high permeability magnetic members may be provided on both sides of the main magnetic pole 14, and the present invention can also be applied to the auxiliary magnetic pole. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

As explained above, according to the present invention, sufficient perpendicular magnetization recording with excellent short wavelength recording characteristics can be achieved even on a recording medium that is easily manufactured, has excellent reliability and durability, and has a high resistivity. It is possible to provide a highly practical perpendicular magnetization type magnetic head and a method for manufacturing the same.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the basic configuration of a perpendicular magnetization type magnetic head, Fig. 2 is a partially exploded perspective view showing the structure of an embodiment of the present invention, and Fig. 3 is a perspective view showing the external shape of the present head. It is. 11, 12...Nonmagnetic holder, 13...Side high permeability magnetic member, 14...Main magnetic pole, 15...Exciting coil, 17...Adhesive.

Claims (1)

[Scope of Claims] 1. A magnetic pole made of a high magnetic permeability magnetic thin film disposed with its tip facing the magnetic recording medium, a side surface high permeability magnetic member bonded to the film surface of this magnetic pole, and a side surface high permeability magnetic member bonded to the film surface of this magnetic pole; an excitation coil wound around the magnetic pole via a permeability magnetic member; and the magnetic pole and side high permeability magnetic member having a width wider than at least the magnetic pole and the side high permeability magnetic member, and around which the excitation coil is wound. A perpendicular magnetization type magnetic head comprising a non-magnetic holder holding a magnetic member from both sides. 2. A step of embedding a lateral high magnetic permeability magnetic member in one surface of the first non-magnetic holder to make the surface extending between the lateral high magnetic permeability magnetic member and the first non-magnetic holder flush with each other; disposed from the coplanar surface of the non-magnetic holder to the surface of the high magnetic permeability magnetic member,
A high permeability magnetic thin film whose tip portion located on the surface of the first non-magnetic holder has a width that defines the track width of the tape, and whose width is narrower than the first non-magnetic holder and the high permeability magnetic member. a step of joining a magnetic pole consisting of the first non-magnetic holder, a step of inserting it into a hole provided in the first non-magnetic holder and winding an excitation coil around the magnetic pole via the side surface high permeability magnetic member; The second non-magnetic holder is adhesively fixed by applying an adhesive to the magnetic pole forming surface of the non-magnetic holder and sandwiching the magnetic pole around which the excitation coil is wound and the high-permeability magnetic member on the side surface. A method of manufacturing a perpendicular magnetization type magnetic head characterized by: 3. The perpendicular magnetization type magnetic head according to claim 2, wherein the magnetic pole is formed by bonding a high magnetic permeability thin film to a surface consisting of the first non-magnetic holder and the side surface high magnetic permeability magnetic member. manufacturing method.