JPH0240109A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a magnetic head without generating a noise and with a superior characteristic by forming a gap protection film made of metal only on a gap holding film formed on the inner peripheral plane of a track width regulation groove. CONSTITUTION:The gap protection film 21 made of metal is formed only on a magnetic gap part provided in the track width regulation groove 18 in the magnetic gap parts provided between a pair of core half bodies 15a and 15b, and no gap protection film 21 is formed on a part where the core half bodies 15a and 15b are butted and confronted with each other. Therefore, no pseudo gap is generated between confronting planes and no noise is generated while a tape is fed. Also, since the magnetic gap part is brought into contact with a joining part 22 made of an inorganic sticking member, not directly, but via the gap protection film, no deterioration due to reaction with the inorganic sticking member in the magnetic gap part is generated. In such a way, it is possible to obtain the magnetic head without generating the pseudo gap and the noise and with the superior characteristic even when the tape is fed repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic head for recording and reproducing data on a magnetic recording medium, and a method for manufacturing the magnetic head.

(Prior Art) In recent years, in order to improve magnetic properties, magnetic heads (so-called metal-in-gap heads) in which the main core is formed using a metallic magnetic material with high saturation magnetic flux density have been developed.

Such a magnetic head is manufactured, for example, by the following method.

That is, as shown in FIG. 7, V is first applied to a pair of magnetic substrates 1a and 1b, such as ferrite, at a predetermined pitch.
After forming a plurality of letter-shaped track width regulating grooves 2, winding grooves 3 and glass flow grooves 4 are provided on the upper surface of one substrate 1a, each perpendicular to the track width regulating grooves 2, to obtain an E core.

In addition, on the upper surface of the other group including the inside of the track width regulating groove 2, as shown in an enlarged view in FIG. A metal gap protective film 7 for protecting the gap holding film 6 is sequentially formed by a vacuum thin film forming method such as a sputtering method to obtain a D core. Then, as shown in FIG.
After arranging the pair of magnetic blocks 8a and 8b of the core and the D core so that the positions of their respective track width regulating grooves 2 match, they are assembled into the pressurizing jig 9 and the pressurizing screw 10 is turned. Press perpendicularly to the opposing surface from both sides. Then, in the suppressed state, an inorganic adhesive member 11 such as glass is inserted into the winding groove 3 and glass flow groove 4 of the E core 8a, respectively, and heated to melt the inorganic adhesive member 11. The melted inorganic adhesive member 11 is attached to the E core 8a and the D core 8.
It flows into the track width regulating groove 2 of b and fills the inside of the groove,
A pair of magnetic blocks are joined by this inorganic adhesive member 11. Next, the upper surface of the joined body of the E core and the D core is ground into a curved surface with a predetermined curvature to form a tape sliding surface, and then cut at a predetermined pitch so that the inorganic adhesive member 11 is exposed. Furthermore, as shown in FIG. 10, the rear part of the obtained head chip 12 facing the tape sliding surface 13 is cut off, and a winding wire (not shown) is wound in a coil shape in the winding groove 3. A magnetic head is manufactured.

(Problem to be solved by the invention) However, in the conventional magnetic head obtained in this way,
As shown in an enlarged view of the tape sliding surface 13 in FIG. 11, a gap protective film 7 made of metal as well as a gap retaining film 6 is provided between the opposed surfaces of the core halves 14a114b made of ferrite or the like. Therefore, when the tape is repeatedly run on the tape sliding surface 13, plastic deformation occurs in the gap protective film 7 in this part, and the gap protective film 7 and the underlying gap retaining film 6 and gap protective film 7 are A pseudo gap is created at the interface with the core half 14a. There is also a possibility that noise may be generated due to this gap.

The present invention has been made to solve these problems, and it is an object of the present invention to provide a magnetic head that does not generate pseudo gaps even when the tape is repeatedly run, and therefore does not generate noise, and a method for manufacturing the magnetic head. purpose.

[Structure of the Invention (Means for Solving the Problems) The magnetic head of the present invention is formed of a magnetic material, and track width regulating grooves are formed along the longitudinal direction on both edges of each opposing surface. A pair of core halves, a magnetic gap portion formed between opposing surfaces of these core halves and on the inner circumferential surface of the track width regulating groove, and a magnetic gap portion formed within the track width regulating groove on both sides of the magnetic gap portion. In the magnetic head, a gap protection member made of metal is provided only between the magnetic gap portion formed on the inner circumferential surface of the track width regulating groove and the bonding portion. A membrane is sandwiched between them.

Further, in the method of manufacturing a magnetic head of the present invention, a plurality of approximately V
a first step of forming a letter-shaped groove; a second step of forming a non-magnetic layer on the main surface of at least one of the magnetic blocks, including the inner circumferential surface of each of the grooves; a third step of forming at least two grooves orthogonal to the V-groove on the main surface of one magnetic block; ■ Arrange them facing each other so that the grooves match, and press these magnetic blocks from both sides to press each opposing surface, ■
a fourth step of metal plating inside the groove, and pressing the pair of magnetic blocks on which the metal plating has been applied from both sides;
a fifth step of arranging an inorganic adhesive member in the groove, heating and melting the inorganic adhesive member and causing it to flow into the V-groove to join the pair of magnetic blocks; and a fifth step of joining the pair of magnetic blocks; A sixth step includes cutting the inorganic adhesive member at a predetermined pitch so that it is exposed on both end faces, and forming a tape sliding surface.

(Function) In the present invention, a metal gap protection film is formed only on the magnetic gap portion provided in the track width regulating groove among the magnetic gap portions provided between the pair of core halves. There is no gap protective film formed between the opposing surfaces of the core halves. Therefore, a false gap does not occur between opposing surfaces while the tape is running.
No noise is generated. Further, since the magnetic gap portion and the joint portion made of the inorganic adhesive member are in contact with each other via the gap protection film and do not come into direct contact, the magnetic gap portion is not deteriorated due to reaction with the inorganic adhesive member.

Furthermore, by carrying out the method for manufacturing a magnetic head of the present invention, it is possible to efficiently manufacture a magnetic head that does not generate the above-mentioned noise.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the magnetic head of the present invention, and FIG. 2 is an enlarged view showing the tape sliding surface.

In these figures, reference numerals 15a and 15b indicate core halves made of a magnetic material such as ferrite and arranged opposite to each other. Line grooves 16 and bonding grooves 17 are formed respectively.

Track width regulating grooves 18 are formed along the longitudinal direction of the opposed surfaces of these core halves 15a and 15b at both end edges thereof, respectively. Then, on the opposing contact surface of the core half 15b on which the winding groove 16 etc. are not formed and on the inner peripheral surface of the track width regulating groove 18,
A metal magnetic film 19 having a high saturation magnetic flux density is formed.

Further, on this metal magnetic film 19, on the opposing surface of the other core half 15a, and on the inner periphery of the track width regulating groove 18,
A gap holding film 20 made of a non-magnetic material such as an inorganic oxide is formed on each of the pair of core halves 1.5a, 1.
5b are butted against each other at flat opposing surfaces with the gap holding film 20 interposed therebetween.

Furthermore, within the track width regulating groove 18, a gap holding film 2 is provided.
A gap protection film 21 made of a metal such as palladium Pd is formed to cover the non-contact portion of the gap. A joint portion 22 made of an inorganic adhesive material such as glass is provided in the track width regulating groove 18 on the gap protection film 21.
The core halves 15a and 15b are joined to each other by this joint 22.

Furthermore, a curved tape sliding surface 23 with a predetermined curvature is provided on the exposed side of the cap holding film 20 of the bonded body.
is formed, and a winding 24 is wound in a coil shape in the winding groove 16.

In the magnetic head of the embodiment configured in this way,
Two metal gap protective films are formed only on the gap retaining film 20 in the track width regulating groove 18, and the core half 15a
, 15b, the gap protection film 2] is not provided between the opposing abutment surfaces of the tape 15b, so even if the tape is repeatedly run on the tape sliding surface 23, the gap between the gap retention film 20 and the magnetic interface in this area is not provided. There is no false gap between
No noise is generated.

In addition, the part of the surface of the gap holding film 20 that directly contacts the joint part 22 made of an inorganic adhesive member (the part inside the track width regulating groove 18) is covered with a metal gap protection film 21, so that the inorganic adhesive The characteristics of the gap retaining film 20 will not deteriorate due to reaction with other members.

Next, a method of manufacturing the magnetic head of this embodiment will be explained with reference to the drawings.

As shown in FIG. 3, first, a plurality of V-shaped track width regulating grooves 26 are formed at a predetermined pitch on the surfaces of a pair of magnetic blocks 25a and 25b made of ferrite or the like cut to a predetermined size. Formed by a mold grindstone processing machine. Next, a gap retaining film made of a non-magnetic material is applied by sputtering to the entire surface of one of the magnetic blocks 25a on which the track width regulating grooves 26 are formed (the flat opposing surface and the inner peripheral surface of the track width regulating grooves 26). (not shown), a winding groove 27 and a bonding groove 28 perpendicular to the track width regulating groove 26 are respectively formed on the opposing surface of the block using a peripheral type grindstone processing machine.

In addition, the entire main surface of the other magnetic block 25b, including the inner peripheral surface of the track width regulating groove 26, is coated with a metal magnetic film with a high saturation magnetic flux density and a non-magnetic gap holding film (both shown in the figure) by sputtering. omitted) in order.

Next, as shown in FIG. 4, these magnetic blocks 25a and 25b are placed facing each other with their flat opposing surfaces facing each other so that their respective track width regulating grooves 26 are aligned, and then pressurized. The magnetic blocks 25a and 25b are held in the jig 29 via the presser plates 30 at both ends, and are pressed from both sides by turning the pressure screws 31. Then, the entire structure as it is is immersed in a metal plating solution 32 containing metal ions such as Pd to perform electroless metal plating. By leaving the metal plating liquid 32 for a predetermined period of time, the metal plating liquid 32 also penetrates into the track width regulating groove 26 between the magnetic blocks 25a and 25b, and a metal gap protective film is formed on the gap retaining film in the track width regulating groove 26. is formed.

Next, the pair of magnetic blocks 25a and 25b are taken out of the plating tank, and while still assembled in the two pressurizing jigs,
As shown in FIG. 5, an inorganic adhesive member 33 such as glass is inserted into the winding groove 27 and the bonding groove 28, respectively, and is heated and melted to form the magnetic block 25a.
, 25b are joined.

2. Thereafter, as shown in FIGS. 6a to 6d, the upper surface of the magnetic block assembly 34 is ground to a curved surface with a predetermined curvature to form a tape sliding surface 35, and then both ends are ground. The head chip 36 is cut at a predetermined pitch so that the joint made of the inorganic adhesive material is exposed, and the rear part of the obtained head chip 36 is cut, and the winding wire is wound in a coil shape in the winding groove 27. , the magnetic head described in FIG. 1 can be obtained.

According to the method of the embodiment configured in this manner, the metal gap protective film is not formed between the opposing surfaces of the magnetic blocks 25a125b, but is formed entirely on the gap holding film in the track width regulating groove 26.

In addition, this gap protective film is formed by electroless plating, and the track width regulating grooves 2 of both magnetic blocks are formed by electroless plating.
Since the gap retaining film is formed in the groove 6 and then plated on top of the gap retaining film, the metal plating layer adheres to a uniform thickness throughout the track width regulating groove 26, forming a gap protective film with a uniform thickness. be done.

[Effects of the Invention] As explained above, according to the magnetic head of the present invention and the method for manufacturing the magnetic head, the gap protective film made of metal is formed only on the gap retaining film formed on the inner peripheral surface of the track width regulating groove. Since the magnetic head is formed, it is possible to achieve good characteristics without generating noise, and it is also possible to eliminate problems in manufacturing the magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the magnetic head of the present invention;
FIG. 2 is an enlarged plan view of essential parts of this embodiment, FIGS. 3 to 6 are perspective views for explaining an embodiment of the method for manufacturing a magnetic head of the present invention, and FIGS. 7 to 10. 11 is a perspective view for explaining a conventional method of manufacturing a magnetic head.
The figure is an enlarged plan view of the main part of a magnetic head obtained by a conventional method. 1, 5 a, 15 b・-: r half body, 16.27-
...Winding groove, 17.28...Joining groove, 18.26.
- Track width regulating groove, 19... Metal magnetic film with high saturation magnetic flux density, 20... Gap holding film, 21... Metal gap protective film, 22... Joint portion of inorganic adhesive member, 2
3.35...Tape sliding surface, 25a, 25b...Magnetic plotter, pressure jig, 2...Metal plating liquid.

Claims (2)

[Claims] (1) A pair of core halves formed of a magnetic material and having track width regulating grooves formed along the longitudinal direction on both edges of each opposing surface, and between the opposing surfaces of these core halves and the A magnetic head comprising magnetic gap portions formed on the inner peripheral surface of the track width regulating groove, and joint portions made of an inorganic adhesive member provided in the track width regulating groove on both sides of the magnetic gap portion. A magnetic head, characterized in that a gap protection film made of metal is sandwiched only between the magnetic gap portion formed on the inner circumferential surface of the track width regulating groove and the bonding portion. (2) a first step of forming a plurality of approximately V-shaped grooves at a predetermined pitch on the main surfaces of a pair of magnetic blocks; and an inner periphery of the V-shaped grooves of at least one of the magnetic blocks. a second step of forming a non-magnetic layer on the main surface including the surface, and a third step of forming at least two grooves orthogonal to the groove on the main surface of the one magnetic block. ,
The magnetic material block in which the groove is formed and the other magnetic material block are arranged facing each other so that the V grooves are aligned with each other, and while pressing these magnetic material blocks from both sides to press the opposing surfaces, A fourth step of applying metal plating inside the V-groove, and placing an inorganic adhesive member within the groove while pressing the metal-plated magnetic block pair from both sides, and heating the inorganic adhesive member. a fifth step of melting and flowing into the V groove to join the pair of magnetic blocks;
A sixth step of cutting the bonded magnetic block at a predetermined pitch so that the inorganic adhesive member is exposed on both end faces, and forming a tape sliding film. Method.