JPS63259812A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To eliminate crosstalk deterioration by the signals of adjacent tracks by forming joint surfaces for joining ferromagnetic metallic films to a part of the end face of a slide made of ferromagnetic ferrite and a part of the butt surface of magnetic core half bodies so as to incline with respect to a magnetic gap. CONSTITUTION:The 1st and 2nd joint surfaces 36, 41 of the floating type magnetic head 30 are so constituted as to incline with respect to the magnetic gap 34 on an ABS plane 38. Formation of a pseudo gap is, therefore, obviated and generation of an abnormal peak 18 in a part of an isolated reproduction waveform 17 at the time of use is prevented; in addition, the end of the magnetic gap 34 is controlled by two pieces of nearly parallel tapered grooves 42a, 42b and, therefore the generation of a V-shaped groove or a rectangular groove by shifting of the cores at the end of the gap 34 is obviated. Generation of the crosstalks by the signals of the adjacent tracks is thus prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a floating magnetic head that performs magnetic recording and reproducing in a minute floating state relative to the surface of a recording medium, and particularly relates to a floating magnetic head having a monolithic type composite core. This invention relates to a type magnetic head.

(Prior art and its problems) Conventionally, magnetic heads for hard disk drives that perform magnetic recording and playback on so-called hard disks with hard recording media surfaces have a magnetic head that levitates at a small distance from the hard disk. A floating magnetic head is used, which includes a slider section having an air bearing surface (hereinafter referred to as ABS surface) and a magnetic head section that performs magnetic recording and reproduction.

Recently, magnetic metals with high coercive force are used as recording media in magnetic recording and reproducing devices that store hard disks in order to increase the recording density. A ferrite magnetic material with excellent frequency characteristics is used in the circuit, and the saturation magnetic flux density is high near the magnetic gap where the magnetic flux is most concentrated, e.g.
Various floating magnetic heads having so-called composite cores formed with ferromagnetic metal films such as Sendust (registered trademark) have been devised and put into practical use. In general, a floating type magnetic head is a composite type in which an independent magnetic head part is buried in a part of the slider part, and a winding groove is formed on the abutting surface, and a magnetic head is wound in this winding groove. It is roughly divided into two types: the monolithic type, in which the core half is integrally joined to the slider part via a gap material made of non-magnetic material. An example of a type magnetic head will be described.

FIG. 13 is a perspective view showing the entire floating magnetic head 1o having a conventional composite core.
4 and 15 are plan views showing the vicinity of the magnetic gap of the magnetic head portion in the first and second conventional examples of the floating magnetic head shown in FIG. 13.

In FIG. 13, 11 is a slider section, and 12 is a magnetic head section. The slider portion 11 is made of a non-magnetic material such as ceramic, and has a pair of ABS surfaces 118.11b that are the same plane.
An inclined surface 11c for introducing air is formed at one end of the pair of ABS surfaces 11a and 11b, and a magnetic head is provided at the air outflow end corresponding to the other end of at least one of the ABS surfaces 11a. The portion 12 is the magnetic gap 1
2a and the ABS surfaces 11a and 11b are buried in the same plane. In the first conventional example shown in FIG. 14, the magnetic head section 12 is composed of a pair of magnetic core halves 14.15 made of ferrite magnetic material, and the abutting surfaces 14a of the magnetic core halves 14.15, 15a, for example,
A ferromagnetic metal film 16 such as sendust is formed flat,
This flat surface is used as the formation surface of the magnetic gap 13. Therefore, in this case, the joining surfaces of the ferromagnetic metal film 16 and the magnetic core halves are equal to the abutting surfaces 14a and 15a and parallel to the magnetic gap. It is well known that the bonding surface between a ferrite magnetic material and a ferromagnetic metal film generally acts as a pseudo-gap, causing noise due to interference in the reproduced waveform. It is also well known that when the two planes are parallel to each other, the influence is stronger.

For example, in digital recording and playback that handles pulses,
As shown in FIG. 16, as a result of this, an abnormal peak portion 18 occurs in the isolated reproduced wave 17 due to the pulse, which causes problems such as malfunction of the device.

Therefore, as shown in FIG. 15, a ferromagnetic metal film 17.
A joint surface 14a for joining 17.

15b is constructed so as to be inclined with respect to the magnetic gap 13. However, in this magnetic head section 12, V-shaped vortices are formed at both ends of the magnetic gap 13 in order to regulate the width of the magnetic gap 13, and molded glass 19 is filled in the grooves. Because there are
There is a problem in that this V-shaped groove tends to pick up signals from adjacent tracks (not shown), which deteriorates crosstalk characteristics. FIG. 17 is a perspective view showing the entire floating magnetic head 20 having a conventional monolithic type composite core, and FIG. 18 is an enlarged plan view showing the vicinity of the magnetic gap of the floating magnetic head shown in FIG. 17. .

In FIG. 17, 21 is a slider part made of a ferrite magnetic material, 22 is a magnetic core half made of a ferrite magnetic material joined to the end surface 21a of the slider part 21, and a winding groove 22a is formed on the abutting surface side. This winding groove 22
A ferromagnetic metal film 23 made of sendust or the like is formed on the abutting surface side including a. ABS surface 2 of slider section 21
4 are formed with two parallel tapered air inflow grooves 25, and a magnetic core is connected to the end surface 27 of the center rail 26 formed between these grooves 25 through a magnetic gap material made of a non-magnetic material. The halves 22 are joined together and the ABS
A magnetic gap 28 corresponding to the track width is formed on the same plane as the surface 2'4. In the above configuration, since the bonding surface 22b between the ferromagnetic metal film 23 and the magnetic core half is parallel to the magnetic gap 28, for the same reason as above, the isolated reproduced waveform 17 is There is one problem in that an abnormal peak portion 18 occurs as shown in FIG.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and has a floating air bearing surface on the surface, and abuts against the end face of a slider portion made of a ferrite magnetic material. The abutting surface of a magnetic core half made of a ferrite magnetic material having a winding groove on the surface is integrally joined via a non-magnetic film,
In the floating magnetic head in which a magnetic gap is formed in the air bearing surface, a bonding surface for bonding a ferromagnetic metal film to a portion of the end surface and a portion of the abutting surface is provided to the magnetic gap. The width of the magnetic gap formed between the ferromagnetic metal films is the same as the width of the magnetic gap formed between the ferromagnetic metal films.
The present invention provides a floating magnetic head characterized in that the amount of seedlings (of books) is regulated by distance.

(Example) FIG. 1 is a perspective view of a floating magnetic head 30 according to the present invention, and FIG. 2 is a part showing the vicinity of the magnetic gap, which is the main part of the invention of the floating magnetic head shown in FIG. This is an enlarged view.

The floating magnetic head 30 of the present invention is structurally of the monolithic type shown in FIGS. 17 and 18, and has a composite core made of a ferrite magnetic material and a ferromagnetic metal film. In FIGS. 17 and 18, 31 is a slider portion made of ferrite magnetic material, and 32 is a magnetic core half made of ferrite magnetic material. A winding groove 33 is formed in the abutting surface 32a of the magnetic core half 32, and the winding groove 33
A first bonding surface 36 for bonding the first ferromagnetic metal film 35, which is inclined with respect to the magnetic gap 34, is formed on a part of the front abutting surface 32a.
The surface of the first ferromagnetic metal film 35 formed on the magnetic gap 6 forms the surface on which one of the magnetic gaps 34 is formed. 37 is a coil wound using the winding groove 33.

The slider portion 31 has an ABS surface 38, and a second ferromagnetic metal film 40 inclined with respect to the magnetic gap 34 is bonded to the end surface 39 near the ABS surface 38 at the center of the end surface 39. A second ferromagnetic metal film 40 formed on the second bonding surface 41 forms a surface on which the other magnetic gap 34 is formed. The magnetic core half 32 includes first and second ferromagnetic metal films 35°40
They are integrally joined with a gap material made of non-1a bamboo material in between, forming a magnetic gap 34 coplanar with the ABS surface 38, and the width of this magnetic gap 34 is equal to or greater than the ABS surface 3.
The center rail 38a is regulated by the width of the center rail 38a formed by the two substantially parallel tapered grooves 42 formed in the center rail 8, forming a substantial track width. More specifically, the tapered groove 42 has a vertical portion 42a and an inclined portion 42.
b, and the track width is regulated by the inclined portion /12b. 43 is molded glass, and winding groove 3
3 is filled by melting. A bonding glass 44 is filled in a bonding groove 45a formed on the abutting surface 32a of the magnetic core half 32 to bond the magnetic core half 32 and the slider 31 together. 46 and 47 are tapered portions for air inflow and air outflow, which are formed at the ends of the slider magnetic core half body 32, respectively.

Reference numeral 48 denotes a mounting groove, which is used to attach to a mounting tool (not shown).

As described above, in the floating magnetic head 30 of the present invention, the first and second bonding surfaces 36 and 41 are configured to be inclined with respect to the magnetic gap 34 on the ABS surface 38, so that a pseudo There is no gap, and during use, no abnormal peak 18 is generated in a part of the isolated reproduced waveform 17 as shown in FIG. Since it is regulated by the tapered groove 42, a V-shaped groove or a right-angled groove due to core misalignment does not occur at the end of the magnetic gap 34, and therefore, crosstalk due to signals from adjacent tracks does not occur. Nor.

Next, a method of manufacturing the magnetic head 30 according to the present invention will be described.

3 to 11 are schematic explanatory diagrams showing the manufacturing process of the floating magnetic head according to the present invention shown in FIGS. 1 and 2, and will be explained below with reference to each figure.

As shown in FIG. 3, a block-shaped magnetic core half 32 made of ferrite magnetic material is prepared, and a plurality of V-shaped first bonding surfaces 36 are arranged at predetermined intervals on the end of this abutting surface 32a. and form it.

Next, as shown in FIG. 4, a block-shaped slider 31 made of ferrite magnetic material is prepared, and a plurality of second bonding surfaces 41 made of V-shaped grooves are formed on the end face 39 of the slider 31, as described above.

Next, as shown in FIG. 5, first and second ferromagnetic metal films 35 and 40 are formed on the first and second bonding surfaces 36 and 41 formed by these V-shaped grooves by thin film forming means such as sputtering. These V-shaped grooves are then filled with mode glass 43 by melting.

Next, as shown in FIG. 6, the winding groove 33 is formed on the abutting surface 32a of the magnetic core half 32 so as to communicate with the first joint surface 36, and the corner for the joint groove 45 is cut. after that,
After polishing the abutting surface 32a and the end surface 39 of the ABS surface 38 to a mirror surface, a non-magnetic thin film (not shown) made of, for example, SiO2 is formed on the abutting surface 32a, and as shown in FIG. After abutting the end surface 39 of the slider 31, the adhesive glass 4 is inserted into the winding groove 33 and the joining groove 45.
4, the slider 31 and the magnetic core half body 31 are joined together. At this time, the first and second ferromagnetic metal films 35 and 40 are bonded so as to face each other in a zigzag pattern.

(See Fig. 12) Next, as shown in Fig. 8, the ABS surface 38 of the slider 31
After forming the mounting groove 48 on the back side of the ferromagnetic metal film 3
By forming a pair of parallel grooves 42a on the ABS surface 38 between the grooves 5 and 40 and substantially perpendicular to the magnetic gap 34, a center rail 38a is obtained, and a magnetic head unit 50 is formed along the cutting grooves 49. To separate. next,
As shown in FIG. 10, tapered portions 46 and 47 for air inflow and outflow are formed on the ABS surface 38.

Next, as shown in FIG. 11, a slope portion 42b is formed on the center rail 38a, and a part of the magnetic core half 32 excluding the center rail 38a is removed by cutting, and the winding groove 33 is removed.
By winding the winding 37 around the wafer, the floating magnetic head 30 shown in FIGS. 1 and 2 can be obtained. FIG. 12 is a plane showing the vicinity of the magnetic gap, and in the same figure,
The shaded area indicates the removed portion of the magnetic core half 32.

(Effects of the Invention) As described above, according to the floating magnetic head of the present invention, a ferromagnetic metal film is formed on a part of the end face of the slider made of ferromagnetic ferrite material and a part of the abutting face of the magnetic core halves. Since the joining surfaces for joining are formed to be inclined with respect to the magnetic gap, these joining surfaces do not act as a pseudo gap during use, and the width of the magnetic gap formed between the ferromagnetic metal legs is Since the distance between the two approximately parallel grooves formed in the bearing surface is regulated, there is no V-shaped groove or right-angled groove caused by core misalignment on the end face of the magnetic gap, and therefore, the distance between the two approximately parallel grooves formed in the bearing surface does not occur. A floating magnetic head having excellent characteristics peculiar to a composite core without deterioration of crosstalk is made possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the floating magnetic head according to the present invention, FIG. 2 is a partially enlarged view showing the vicinity of the magnetic gap, which is the main part of the floating magnetic head shown in FIG. 11 are schematic explanatory diagrams showing the manufacturing process of the floating magnetic head of the present invention shown in FIGS. 1 and 2, FIG. 12 is a plan view showing the vicinity of the magnetic gap, and FIG. 13 is a conventional 14 and 15 are perspective views showing the entire floating magnetic head having a composite type decoding core, and FIGS. A plan view showing the vicinity of the gap, FIG. 16 is an explanatory diagram for explaining the state in which an abnormal peak occurs in the isolated reproduced waveform, FIG. 17 is a secondary diagram, 32... magnetic core half,
32a... Butt surface, 33... Winding groove, 34...
Magnetic gap, 35.40...Ferromagnetic metal film, 36.
41... Joint surface, 37... Coil, 38... Air bearing surface, 39... End face of slider, 4
2...Tapered groove.

Claims (1)

[Claims] The end face of the slider part, which has a floating air bearing surface on its surface and is made of a ferrite magnetic material, and the abutting surface of the magnetic core half, which has a winding groove on its abutting surface and is made of a ferrite magnetic material, are covered with a non-magnetic film. In a floating magnetic head formed by bonding the air bearing surfaces together through a magnetic gap and forming a magnetic gap in the air bearing surface, a bonding surface for bonding a ferromagnetic metal film to a portion of the end surface and a portion of the abutting surface. is formed to be inclined with respect to the magnetic gap, and the width of the magnetic gap formed between the ferromagnetic metal films is regulated by the distance between two substantially parallel grooves formed in the air bearing surface. Features a floating magnetic head.