KR100200853B1 - Magnetic head for recording and reproducing and the manufacturing method - Google Patents

Abstract

A magnetic head for magnetic recording reproduction and a method of manufacturing the same are disclosed.

The disclosed magnetic head comprises a multi-layered magnetic layer in which a magnetic film and an insulating film are sequentially stacked to form a track, and a non-magnetic substrate bonded to and supported on both sides of the multi-layered magnetic layer, and bonded to each other so that a gap is formed at the front end surface thereof. A pair of core bodies and a coil for applying a recording signal,

A ferrite member having a coil winding groove is further provided on a pair of lower ends of the core half, and the coil is wound around the coil winding groove of the ferrite member.

In addition, it is characterized by providing a method of manufacturing a magnetic head by adhering and slicing the ferrite member mentioned in the core half body.

Description

Magnetic head for magnetic recording reproduction and its manufacturing method

1 is a perspective view schematically showing one form of a conventional metal-laminated magnetic head.

2 is a perspective view schematically showing a magnetic head for magnetic recording reproduction according to the present invention;

(A) to (i) are schematic perspective views showing step by step a method of manufacturing a magnetic head for magnetic recording reproduction according to the present invention.

* Explanation of symbols for main parts of the drawings

31,32: core half 33: magnetic film

34 Insulation Film 35 Multilayer Magnetic Layer

36,37: Non-magnetic board 38: Self Information Home

39: spacer G: magnetic gap

40: ferrite member 42: coil winding groove

44: coil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used for the formation of a VTR, a camcorder, and the like for recording and reproducing an audio signal, and to a method of manufacturing the same. A head and a method of manufacturing the same.

In general, a magnetic head is used to record information on a magnetic recording medium or to reproduce recorded information. The magnetic head is an apparatus for recording and / or reproducing information when the front end surface of the magnetic head touches a tape surface.

The magnetic recording / reproducing method using the magnetic head as described above is a digital method capable of recording and / or reproducing about 2 to 4 times as much information as the analog method in recent years. There is an increasing demand for high density recording in order to record a large amount of information within a limited range of recording media.

To respond to this, a metal-in-gap (MIG) magnetic head or metal-laminate (MIG) using a magnetic material that reduces eddy current loss at high frequencies and has better magnetic properties than ferrite (ferrite) ML: metal laminated) Research on magnetic heads such as magnetic heads is actively underway.

The MIG magnetic head is formed by forming a metal magnetic body film having a predetermined thickness by depositing sender in a gap region formed by a pair of manganese-zinc (Mn-Zn) ferrite single crystals in order to obtain better characteristics than a ferrite magnetic head. The MIG magnetic head made in this way has a problem in that the gap portion is easily saturated and the recording efficiency is lowered as the amount of leakage magnetic flux used to magnetize the tape is reduced toward the tape.

The ML magnetic head improves the problem of the MIG magnetic head mentioned above. Referring to FIG. 1 which shows one form of the conventional ML magnetic head, the following is described.

The paired 1-type core half body 11 and the C-type core half body 12 are formed by stacking the magnetic film 13 and the insulating film 14 sequentially to form a multi-layer magnetic layer 15 constituting a track, and the multilayer magnetic layer ( It is composed of a pair of non-magnetic substrates (16, 17) bonded to both sides of the support 15). In the C-shaped core half body 12, a coil winding groove 18 and a magnetic gap G are formed, which are bonded by an adhesive to form an annular magnetic path (magnetic circuit), while the magnetic gap G is formed. In the concave portions formed at both ends, a gap fusion glass such as SiO ₂ or epoxy is deposited to a predetermined thickness as a spacer 19 for maintaining the shortness of the magnetic gap, thereby forming a gap film.

Therefore, the present invention aims to obtain stable efficiency in the high frequency band by preventing saturation near the gap and preventing a decrease in recording efficiency.

This ML magnetic head is a magnetic flux induced by a current applied to a coil wound around the coil winding body of the type C core body and the type I core body around the coil winding groove, and flows through the magnetic path. It leaks to the outside in the gap and records on the magnetic recording medium.

The ML magnetic head of such a structure has a coil wound around a portion of the magnetic head body, so that the area of the magnetic field forming region is not only narrow, but also the coil wraps around the multilayer magnetic layer and the non-magnetic substrate, so that the number of turns of the coil is increased relatively to obtain the desired inductance shall. That is, when the size of the magnetic head is small or the size of the coil winding groove cannot be increased, the number of assembling labor and production efficiency are deteriorated.

Accordingly, the present invention has been made in view of the above-described point, and the coil is provided with a member capable of winding the coil in the lower portion of the I-type core half and the C-type core half bonded to each other to obtain an effective inductance. It is a first object to provide a magnetic head for magnetic recording and reproduction, which is capable of improving assembly labor and productivity because of winding.

In addition, the present invention provides a magnetic recording reproducing magnet obtained by adhering a member capable of winding a coil so as to increase the effective inductance and improve the recording / reproducing characteristic to the lower portions of the interlocked I-type core half and C-type core half. A second object is to provide a method of manufacturing a head.

The magnetic head for magnetic recording reproduction according to the present invention for achieving the first object is

A pair of core bodies having a multilayer magnetic layer in which a magnetic film and an insulating film are sequentially stacked to form a track, and a nonmagnetic substrate bonded to both sides of the multilayer magnetic layer and supporting the same, and having a gap formed on the front end thereof; In the magnetic recording and reproducing magnetic head having a coil for applying a recording signal,

A ferrite member having a coil winding groove is further provided on the bottom surfaces of the two core bodies bonded to each other, and the coil is wound around the coil winding groove of the ferrite member.

A magnetic head manufacturing method for magnetic recording reproduction according to the present invention for achieving the second object is

A first step of alternately laminating a plurality of magnetic films and insulating films on a non-magnetic substrate and then performing heat treatment to form a core strip;

A second step of forming a core block by laminating and bonding the core strips in multiple layers;

Slicing the core block into an I-type core block and a C-type core block;

Forming an adhesive slot in the sliced I-type core block and forming an adhesive groove and a coil winding groove in the C-type core block;

A fifth step of forming a pair of core blocks by bonding and slicing the type I core block and the type C core block in a predetermined shape;

A sixth step of preparing a ferrite member having a width corresponding to the bottom width of the pair of core blocks, and forming a coil winding groove having a predetermined width on one surface of the ferrite member;

A seventh step of adhering the ferrite member to the bottom surface of the pair of core blocks such that coil winding grooves formed on one surface of the ferrite member face each other;

An eighth step of slicing the tips of the pair of core blocks bonded together and slicing them into a plurality of magnetic head bodies;

After winding the coil in the coil winding groove of the ferrite member of each sliced magnetic head, characterized in that the ninth step of attaching to the base.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a magnetic head for magnetic recording reproduction according to the present invention.

2 is a perspective view schematically showing a magnetic head for magnetic recording reproduction according to the present invention.

The magnetic head comprises a multilayer magnetic layer 35, in which a magnetic film 33 and an insulating film 34 are sequentially stacked to form a track, and a pair of nonmagnetic substrates bonded to and supported on both sides of the multilayer magnetic layer 35. A pair of core bodies (31,32) composed of (36,37) and bonded to each other;

A ferrite member 40 coupled to the lower surfaces of the core bodies 31 and 32 and having a coil winding groove 42 for winding a coil;

It is roughly divided into a coiled coil 44 for providing a current signal to record information on the magnetic recording medium.

The core half bodies 31 and 32 are divided into an I-type core half body 31 and a C-type core half body 32 according to the shape thereof, and are bonded by mutual adhesives. An adhesive slot (not shown) is formed on an adhesive surface of the I-type core half body 31, and an adhesive groove part (not shown) and a magnetic path (magnetic path) guide are formed on the adhesive surface of the C-type core half body 32. A sphere 38 is formed. This ruler guide 38 is provided in the same form as the conventional coil winding groove, the size can be optimized through electromagnetic field analysis and the like.

A magnetic gap G having a predetermined width is provided on the opposing surface of the joined core halves, and a gap melt such as SIO ₂ , epoxy, or the like is used as a spacer 39 for maintaining the predetermined gap. Wearing glass is deposited to a predetermined thickness.

The magnetic film 33 is formed of a material such as sendust, FeRuGaSi, FelrGaSi, Fe-N-based microcrystalline alloy, and the insulating film 34 is preferably formed of a material such as SiO ₂ , Al ₂ O ₃ . In addition, it is preferable that the mutual bonding of a pair of core half bodies is joined using an epoxy.

The ferrite member 40 is bonded to the lower portion of the core half body (31,32) by epoxy, etc., the coil winding groove 42 is formed on the surface facing the core half body (31,32). The coil 44 is wound on the body of the ferrite member 40 through the coil winding groove 42.

Accordingly, the magnetic flux induced by the current applied to the coil 44 leaks out of the gap G through the ferrite member 40 over the track of the multilayer magnetic layer 35 of the core half 31 and 32. As a result, they are recorded on the magnetic recording medium.

In this way, the ferrite member is further provided, and by winding the coil around the ferrite member, the magnetic path provided in the ferrite member can be widened, so that the number of coil turns necessary to obtain the same effective inductance as compared with the magnetic head according to the conventional invention mentioned above. Can be reduced. In addition, since the size of the coil winding groove does not directly affect the core half body, when winding a plurality of coils, the size of the coil winding groove can be easily adjusted to improve the assembly labor and productivity.

(A) to (i) of FIG. 3 are perspective views showing each manufacturing step in order to explain the manufacturing method of the magnetic head for magnetic recording reproduction according to the present invention.

Referring to this drawing, referring to the manufacturing method of the magnetic head for magnetic recording reproduction according to the present invention is as follows.

In the first step, a plurality of layers of the magnetic film 33 and the insulating film 34 are alternately stacked on the nonmagnetic substrate 37 and then heat-treated, and the nonmagnetic base 36 is further stacked to form a core strip 50. ) To form. The core strip 50 can be sliced later to create a plurality of magnetic heads. Here, the magnetic film 33 is formed of a material such as sender, FeRuGaSi, FelrGaSi, Fe-N-based microcrystalline alloy, and the insulating film 34 is preferably formed of a material such as SiO ₂ , Al ₂ O ₃ . .

The second step is a step of forming a core block 60 by laminating and bonding the core strips 50 in multiple layers. At this time, it is preferable to use an epoxy resin as the adhesive.

The third step is to slice the core block 60 to a predetermined size, and each of the sliced core blocks has a shape corresponding to the C-type core block 62 and the I-type core block 64 later.

In the fourth step, an adhesive groove 66 and a guiding groove 68 are formed in the C-type core block 62 among the sliced core blocks, and an adhesive slot 68 is formed in the I-type core block 64. ).

In the fifth step, the C-type core block 62 and the I-type core block 64 are bonded to each other in a predetermined form and sliced to form a pair of core blocks 70. When bonding, it is preferable to use an epoxy resin as an adhesive and to heat it to about 100 ° C., followed by pressure bonding.

The method and structure of forming a pair of core blocks 70 through the process of the first step to the fifth step mentioned above are well known, and the embodiment of the present invention, the process of the first to fifth steps Follow the usual method. Here, the formation process of the gap is omitted.

In a sixth step, a ferrite member 80 having a width corresponding to a bottom width of the pair of core blocks 70 is prepared, and a coil winding groove 85 having a predetermined width is formed on one surface of the ferrite member 80. do.

In the seventh step, the ferrite member 80 is bonded to the bottom surface of the pair of core blocks 70 by using an epoxy resin or the like as an adhesive so that the coil winding grooves 85 face each other.

In the eighth step, the ends of the bonded core blocks 70 are curved and sliced to form a plurality of magnetic head bodies.

In the ninth step, a coil is wound around the coil winding groove 42 of the ferrite member 40 of each sliced magnetic head to complete the magnetic head. Of course, the coil is electrically connected to the base to which the magnetic head is coupled.

The magnetic head manufactured through this step has a coil wound around the ferrite member causing magnetic induction, and the generated magnetic flux flows over a metal-laminated magnetic path (magnetic path) bonded to the upper side to perform recording and reproduction. Will be performed.

Therefore, according to the method of manufacturing the magnetic head for magnetic recording reproduction according to the present invention, an effective inductance can be obtained with the same number of coil turns as compared with the case where the coil is wound around the core body by winding the coil on the ferrite member. The design of the formed coil winding groove can be simplified, thereby simplifying the manufacturing process. In addition, by simplifying the coil winding process it is very useful to reduce the assembly labor and assembly time.

Claims (5)

A magnetic layer and an insulating layer are sequentially stacked to form a multi-layer magnetic layer forming a track, a pair of core bodies bonded to both sides of the multilayer magnetic layer to support them, and a pair of core bodies bonded to each other so that a gap is formed at the front end surface thereof; In the magnetic recording and reproducing magnetic head provided with a coil for applying a recording signal, a ferrite member having a coil winding groove is adhered to the pair of lower ends of the core half body, and the coil is formed in the coil winding groove of the ferrite member. Magnetic head for magnetic recording reproduction, characterized in that the winding. 2. The magnetic head for magnetic recording reproduction according to claim 1, wherein the ferrite member is attached to the bottom surface of the core half with an epoxy resin. A first step of alternately stacking a plurality of magnetic films and insulating films on a non-magnetic substrate and then performing heat treatment to form a core strip; and stacking and bonding the core strips in multiple layers to form a core block A second step, the third step of slicing the core block into an I-type core block and a C-type core block, and forming an adhesive slot in the sliced I-type core block, and attaching to the C-type core block. A fourth step of forming a groove portion and a coil winding groove, a fifth step of bonding and slicing the I-type core block and the C-type core block in a predetermined form to form a pair of core blocks, and a bottom surface of the pair of core blocks Preparing a ferrite member having a width corresponding to the width, and forming a coil winding groove having a predetermined width on one surface of the ferrite member; and placing the ferrite member on the bottom surface of the pair of core blocks. A seventh step of adhering the coil winding grooves formed on one surface of the groove member to face each other, an eighth step of slicing the tip ends of the bonded core blocks into a plurality of magnetic head bodies, and each of the sliced magnets And a ninth step of winding a coil in a coil winding groove of the ferrite member of the head and attaching the coil to a base. 4. The magnetic film of claim 3, wherein the magnetic film is formed of sender, FeRuGaSi, FelrGaSi, Fe-N-based microcrystalline alloy, or the like, and the insulating film is formed of SiO ₂ , Al ₂ O _3, or the like. And a magnetic head for magnetic recording reproduction. 4. The method of manufacturing a magnetic head for magnetic recording and reproducing according to claim 3, wherein an epoxy resin is used to bond the ferrite members to the lower surfaces of the pair of core blocks in the seventh step.