JPH01264610A - Compound type magnetic head - Google Patents

Abstract

PURPOSE:To guarantee the strength of the whole head by filling a space formed of the magnetic substances of side surfaces to be mutually opposed of the projecting parts of two substrate blocks with a nonmagnetic substance. CONSTITUTION:The track width of a compound type magnetic head is made narrower than a core width, and a kerf for deciding the track width is provided. The kerf is formed from a core front part to a core rear part in both edge parts in leaving a ferrite part with a width narrower than the track width on a surface at the gap formed side of a ferrite block. Metallic substance materials 30 and 30' are made to adhere towards the side part of the left ferrite projecting part by a spattering or a thin film forming technique such as a vacuum evaporation. A groove part is filled with nonmagnetic substances 33 and 33' such as a glass, a ceramic and a resin as reinforcing materials. In such a case, ferrite projecting parts 35 and 35' are made into the core of a metallic magnetic substance film, a wear resistance can be guaranteed, and a mechanical strength can be also increased.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a magnetic head suitable for recording and reproducing high frequency signals such as a VTR, and particularly to a composite magnetic head suitable for high coercive force recording media.

[Prior art 1] It is well known that it is advantageous to increase the coercive force Hc of a magnetic recording medium in a high-density magnetic recording/reproducing device. requires a strong magnetic field. However, since the ferrite material currently used in magnetic heads has a saturation magnetic flux density BS of about 4000 to 5000 Gauss, there is a limit to the strength of the recording magnetic field that can be obtained, and the coercive force He of the magnetic recording medium is 1000 Gauss. If you cross Ørsted, the disadvantage is that your record will be incomplete. On the other hand, Fe-A+1-81 alloy (called sendust), which is a generic name for metal magnetic materials, and N1-Fe alloy (
Magnetic heads using crystalline magnetic alloys such as Permalloy or amorphous magnetic alloys generally have higher saturation magnetic flux density than ferrite materials, and have excellent characteristics such as low sliding noise. However, in the case of a generally used track width (10 .mu.m or more), the effective magnetic permeability in the video frequency domain is lower than that of Ferrai I due to eddy current loss, resulting in a disadvantage that the reproduction efficiency is lowered. Also, in terms of wear resistance, it is several steps inferior to ferrite. In order to solve the above-mentioned problems, a composite magnetic head has been proposed that combines ferrite and metal magnetic materials to take advantage of the advantages of both. For example, as shown in a perspective view of the magnetic helad core in FIG. 1, the core portion 10 is made of high magnetic permeability ferrite, and the working gap vicinity portion 11, which is the main part of the recording action, is made of a metal magnetic material formed by physical vapor deposition. A composite magnetic head consisting of the following has been proposed. Furthermore, in order to narrow the track of a magnetic head for high-density recording, a cutout groove 12 for narrowing the track width is provided in the vicinity of the working gap, and this groove is filled with a reinforcing nonmagnetic material. 13 is a window for coil winding. FIG. 2 shows a plan view of the recording medium facing surface of the conventional magnetic head 1. Here, there is a drawback that the coupling boundary part 14.14' between the Ferrite 1 core part 10.10' and the metal magnetic material part 11.11' acts as a pseudo operating gap and impairs the recording and reproducing characteristics. If the coupling boundary 14.degree. 14' and the operating gear knob 15 are parallel, a considerable amount of signal will be picked up at the boundary, which has the disadvantage of a severe contour effect. In addition, in order to remove the contour effect, 71941-37 part 10
．． 10' and a metal magnetic material part 11. ．． It is known to provide suitable irregularities on the joint boundary 14, 34' of 11'. However, it is difficult to completely eliminate the contour effect. As another conventional example, a pad having a structure as shown in FIG. 3 is known. In this head, a metal magnetic material 21 having a high saturation magnetic flux density is formed on the -L side of a non-magnetic substrate 20 by physical vapor deposition such as sputtering or vacuum evaporation to a thickness equal to the track width, and a non-magnetic material 20' is formed on the -L side of the non-magnetic substrate 20. After bonding with a glass thin film, divide it into two equal parts and wrap the gap butting surfaces.
A coil winding window 22 is formed, and a gap abutting surface 2 and 3 are formed.
It is obtained by bonding the magnetic layer to the magnetic layer through a specified non-magnetic film. This structure has problems in the gap formation method, is inefficient, has difficulty in achieving gap length accuracy, and has poor yield and productivity. JP-A No. 56-169214 includes figures 11 (d) and (
A head as shown in (e) is disclosed. The head +
' as shown in Figure 11 (A), Figure 11 (, +47
) Prepare a roof-shaped ferrite 1-block with continuous triangles in the part from winding $13 to 142], 00,
A magnetic alloy 11 such as an alloy is deposited on the roof-shaped part of the sender 1 by sputtering or the like to form a composite magnetic block as shown in FIG. The top portion of the roof shape is polished to form a pad gap abutting surface, and a silicon oxide film is deposited thereon to fabricate a composite magnetic block 100a that forms one side of the head chip. Next, as shown in FIG. 11(c), the composite magnetic block 100b forming the other chip provided with the winding window 13 and the above-mentioned 100a are butted and bonded together. Then cut the part indicated by the dotted line in Figure 11 (c),
Assume that a composite magnetic hexagonal as shown in FIGS. 11(d) and 11(e) is used. The composite magnetic head manufactured in this way has the direction of the joint surface between the ferrite core portion 30.10' and the magnetic alloy 11,
Since the directions of the actuation caps 1-5 are oblique, it is possible to reduce the deterioration of characteristics caused by an undesired gap. Problems to be Solved by the Invention j An object of the present invention is to provide a composite magnetic head that exhibits excellent recording and reproducing characteristics even on high coercive force recording media. [Means for Solving the Problems 1] In order to achieve the object described in 1-, the composite magnetic helenoid I of the present invention has two protrusions of two base blocks each having a protrusion whose width increases as the distance from the tip increases. A magnetic substance is adhered to both sides of the protrusion, and the magnetic substance faces each other at the tip of the protrusion described above through the actuating cap, and the magnetic substance on the opposing sides of the protrusion of the two base blocks It is characterized in that the space formed by is filled with a non--8=magnetic material. In particular, the present invention fills the space formed by the magnetic material on the opposing sides of the protrusions of the two base blocks with the non-magnetic reinforcing member 5, so that the medium sliding surface becomes flat and the medium It won't hurt you. Furthermore, the magnetic material at the tip of the protrusion is reinforced, and the strength of the entire head is guaranteed. Furthermore, since the magnetic bodies are formed substantially symmetrically, uneven wear can be prevented. It is preferable that the width of the protrusion increases as the distance from the working gap increases. By doing so, the magnetic material can be efficiently deposited on the side surfaces of the groove, and the contact area with the base block can be increased. Also, if the apex angle of the protrusion is too thick, it will easily cause errors in the track width, and if it is too small, the protrusion will become mechanically weak, so the apex angle of the protrusion (or the angle formed by both sides) is preferably 45° to 90°. The base block is usually made of Mn-Znn (Mn-Znn) or Ni-Znn (1), and the magnetic material has a saturation magnetic flux density higher than that of the base block and a magnetostriction of around 0. Any magnetic permeability material may be used, but typical examples include the well-known Fe-Si alloy and Fe-Si alloy.
Al, -8i alloy (so-called Senges 1~ series alloy) +
Examples include NJ, Fe alloys (so-called permalloy alloys) and various high magnetic permeability amorphous alloys. Alternatively, a magnetic material may be used, such as SjO, AQ203, in which non-magnetic layers having a thickness of 100 to 1 .mu.l'H and the high saturation magnetic flux density magnetic layer are alternately laminated. In this way, magnetic properties can be improved by alternately laminating magnetic layers and non-magnetic layers. In order to increase the saturation magnetic flux density in the vicinity of the gap, the operating gear forming surface is preferably formed of only the magnetic material, but even if it is formed of both the magnetic material and the base block, it is still formed of a core made of a single member. The effects of the present invention are recognized as compared to the conventional ones. The magnetic film on both sides of the base block protrusion is desirably filled with a non-magnetic material up to the side surfaces of the core. When the working gap forming surface is made of only the magnetic material having the high saturation magnetic flux density, it is preferable that the width of the base block at the tip of the protrusion in the rack width direction is equal to or less than ]/2 of the track width; The base block width of the part may be set to 0, that is, the tip part may be square. By doing so, the contour effect is reduced to such an extent that it hardly becomes a problem. Furthermore, if the surface of the base block at the tip is processed so that it is not flat, more favorable results can be obtained in terms of the contour effect. When the working gap forming surface is composed of both the magnetic material with the high saturation magnetic flux density and the base block, in order to increase the saturation magnetic flux density near the working gap, the total width of the magnetic material in the track width direction on the gear forming surface is It is desirable that the width be at least twice the width of the base block. The thickness of the high saturation magnetic flux density magnetic material deposited on both sides of the protrusion of the base block is usually 1/2 or less of the track width. This means that the width in the rack width direction of the magnetic material exposed on the surface facing the recording medium in the working gap is equal to or greater than the sum of the thicknesses of the magnetic material deposited on both sides of the base block protrusion. This is because the value is -H. When the tip of the base flock protrusion is square, the width of the working gap is approximately 1 the sum of the thicknesses of the magnetic material, so the thickness of the magnetic material is approximately 1/2 of the track width. It is better. In the present invention, the magnetic material is applied to both sides of the base block protrusion, and if it is applied only to one side, the bonding area between the magnetic material and the base block becomes small and the magnetic circuit is The magnetic resistance of the magnetic material increases, the thickness of the magnetic material to be deposited must be increased to about the width of the track, and furthermore, the process becomes complicated because it is deposited only on one side, which is undesirable. The above-mentioned magnetic head may consist of two half-core cores having substantially the same structure as described above except for the coil winding window, or may consist of only one core half-closed and the other half-operated. A different structure may be used except that a second magnetic body having a higher saturation magnetic flux density than the base block is present on the gap forming surface. For example, one of the high saturation magnetic flux density magnetic bodies facing each other across the working gap made of non-magnetic material is the first one which is composited with the base block in the composite material having the structure described in item 1.
a high saturation flux density magnetic material, the other being a second high saturation flux density magnetic material deposited on top of the composite. In this case, the winding coil can be provided by thin film fabrication techniques. The materials of both magnetic bodies may be the same or different. In the structure of the composite magnetic head of the present invention, all matters other than those described in this specification are the same as those of the prior art. In the composite magnetic head of the present invention, most of the core is made of Mn-Zn ferrite 1- or Ni-Zn ferrite having high magnetic permeability.
It is made of a bulk material of n-ferrite, and the part constituting the working gap part and most of its vicinity are made of a magnetic material having a high saturation magnetic flux density, such as Fe-3i system, Fc-Al1
It is made of a crystalline alloy or an amorphous alloy such as -8i series or Nj-Fe series, and is produced by physical vapor deposition such as sputter link or vacuum vapor deposition. [Function] The composite magnetic head according to the present invention has excellent properties such as saturation magnetic flux density, effective magnetic permeability, and wear resistance because the head is composed of a composite of different materials. Since the coupling boundaries are non-parallel, the adverse effects of the recontouring effect can also be reduced. Further, in the two base blocks each having a protrusion, a magnetic substance is attached to both sides of the protrusion, and the magnetic substance faces each other across an operating gap at the tip of the protrusion, and Since the space sandwiched between the magnetic material on the side surface of the protrusion of the base block is filled with a non-magnetic reinforcing member, the strength of the tip of the protrusion is maintained, and the media sliding surface can be configured to be flat. There is no need to worry about damaging the edges of the magnetic film. Furthermore, the shape of the magnetic film is symmetrical, so there is no need to worry about uneven wear or step wear. [Example] Hereinafter, the structure of the magnetic device of the present invention will be explained in detail by referring to an example. Embodiment 1 FIGS. 4(a) and 4(b) are a perspective view and a plan view showing the structure of a composite magnetic eight I- in the embodiment 1 of the present invention. 30.30' forms the l/rack part and the operating gap part, is made of a metal magnetic material with high saturation magnetic flux density, and is made of Fe-
8i, Fe-Al-8i. It is composed of a Ni-Fe crystalline alloy or an amorphous alloy, each having a composition near zero magnetostriction. On the other hand, 31, 31. ' is Mn-Znn Fushii 1
~． It consists of a bulk material with high magnetic permeability such as Ni--Znn cover 1-, and is magnetically connected to the metal magnetic material. Further, a predetermined non-magnetic film is formed on the abutted portion of the pair of metal magnetic materials, and constitutes the actuation cap 32. In addition,
1-The rack width is narrower than the core width, and a groove is provided to determine the track width. The grooves are formed on both sides of the ferrite block from the front to the rear of the core, leaving a ferrite portion narrower than the track width on the gap forming side surface of the caulked ferrite block. The metal magnetic material 30, 30' is deposited on the side of the remaining ferrite protrusion by a thin film forming technique such as sputtering or vacuum deposition. Note that the groove is made of non-magnetic material such as glass, ceramic, or resin.
' is filled as a reinforcing material. 34 is a window for coil winding. Moreover, FIG. 4(b) shows an enlarged view of the magnetic tape sliding surface. In the present invention, metal magnetic films 30 and 30' are attached to both sides of the ferrite projections 35 and 35'. Therefore, the thickness of the metal magnetic material only needs to be about half of the track width t.
Film formation time is shortened. If the ferrite protrusions 35 and 35' on the magnetic tape sliding surface shown in FIG. 4(b) are shaped to become wider as they move away from the working gap 32, a metal magnetic film can be sputtered from the working gap surface side when the core is half-closed. This allows efficient film formation. Further, since the metal magnetic film is divided into two pieces, even a single layer film can reduce the influence of eddy current loss. Furthermore, since the shape of the joint between the ferrite part and the metal magnetic film has no parallel part to the working gap 32, there is no concern about deterioration of characteristics due to the contour effect. moreover,
The ferrite protrusions 35° and 35' form the core of the metal magnetic film, and furthermore, since they extend close to the operating gap, wear resistance is ensured and mechanical strength is also high. Furthermore, the present invention is suitable for a magnetic head having a track width of ten-odd microns or less because it eliminates the need to cut out grooves for regulating the track width after attaching the metal magnetic film, and it This solves the problem of 11ψ delamination that occurs. The composite magnetic eight 1 of the present invention described above includes: 1) on the gap forming side surface of the block made of high magnetic permeability ferrite;
At least one set of grooves, each consisting of two adjacent grooves, are provided in parallel so as to sandwich a protrusion having a tip end having a width narrower than the track width. a step of depositing a magnetic material having a higher saturation magnetic flux density than the ferrite on at least the groove surface of the gap forming side surface of the ferrite 1-block; 1ii) depositing a magnetic material on the surface of which the magnetic material is deposited; iv) removing unnecessary parts of the non-magnetic material and magnetic material to expose a gap forming surface having a predetermined track width; A step of preparing a pair of blocks and forming a groove for a coil winding window on the gap forming side surface of at least one of the blocks so as to be substantially orthogonal to the groove, vi) Step 1 above after completing Step V)
Step of forming a nonmagnetic layer of a required thickness on the gap forming side surface of at least one of the paired blocks, vii), T1
After completing step 1 vi), the gap forming surfaces of the pair of blocks are made to face each other and joined together to form an integral unit; It can be easily manufactured using a manufacturing method that includes a step of obtaining one magnetic core. In step 1), the groove may be provided so as to run longitudinally from one edge to the other edge of the gap-forming side of the block, or may be provided only on the -edge side. Further, in step i), the tips of the projections between the adjacent grooves may be processed so that a flat surface exists or may be processed so that no flat surface exists. Furthermore, in step j), the tips of the projections may be on the same level as the flat parts adjacent to the grooves of each set,
Alternatively, it may be lower than the adjacent flat portion. If the height is lower than the adjacent flat portion, the level difference between the tip of the protrusion and the adjacent flat portion should be equal to or less than the thickness of the magnetic material having the high saturation magnetic flux density, that is, equal to or less than half the track width. If this is not done, the level difference will still exist even after the magnetic material is attached to the protrusion, making the step vii) difficult. Hereinafter, in order to understand the structure of the composite magnetic spatula 1- of the present invention, the manufacturing method thereof will be explained in more detail with reference to the drawings. Explanatory diagrams of each step of the manufacturing method are shown in Figures 8 (a) to (January). ]) Figure 8 (a) shows the gap abutment surface 41 of the raised block made of high magnetic permeability ferrite. Two adjacent grooves 4.2.42' leaving a protrusion narrower than the track width
This is a process in which multiple sets of grooves are provided in parallel. Here, the high magnetic permeability ferrite is M n -Z n ferrite J
~, consists of a single crystal or polycrystal of Ni-Zn ferrite, and forms the main part of the magnetic core. A metal bonded grindstone or a resin bonded grindstone with a 7- or U-shaped tip is used to form the groove, and the groove is processed with a high-speed dicer or the like. Further, the grooves 42 and 42' can be processed simultaneously using two grindstones stacked on top of each other. Figure 8 (B) shows an enlarged side view of the groove 42, 42' machined in the process shown in Figure 8 (A) (hereinafter, this corresponds to Figure 8 (A), Figure 8 (B), etc.) Processes are referred to as process (a) and process (b)). here,
The flat portion 43 left between each set of grooves is a reinforcement portion of the metal magnetic film and serves as a reference surface during subsequent steps, such as polishing in step (e) and bonding of blocks in step (h). -20~ 1j) Step (c) is a step in which a metal magnetic film 44 having a higher saturation magnetic flux density than ferrite is deposited by sputtering on the entire gap abutting surface including the groove portion obtained in step (a). The metal magnetic material is Fe-8i (S
j 6.5% by weight), FO-Al-8i alloy (Sendas h) + N1-Fe alloy (Permalloy), etc., and amorphous alloy is Co-Fe-8i-
Well-known metal-metalloid alloys represented by B series and C
Well-known metal-metal alloys such as o-Ti and Co-Mo-Zr are used. Another deposition method is vacuum evaporation. Although various methods such as emblating, chemical vapor deposition, plating, etc. are possible, there are drawbacks such as the fact that only a limited number of metals can be formed and the composition varies greatly, so sputtering is suitable. Furthermore, the sputtering method has the advantage of high adhesion strength and good penetration into grooves, and is therefore suitable for the method of the present invention. The thickness of the deposited magnetic metal material may be approximately 172 mm thick of the required track width. Therefore, compared to the conventional method, eddy current loss can be reduced even with an flt- magnetic film. Furthermore, if necessary, a multilayer film in which nonmagnetic materials are alternately laminated may be used. 11) Step (d) is to apply a non-magnetic material 45 on the metal magnetic film obtained in step (c) to the extent that at least the remaining grooves are filled.
"Fill it up" - that's it. For the non-magnetic phase 45, glass, ceramic-based inorganic adhesive, or hard resin is used. Glass is suitable from the standpoint of stability. As long as the metal magnetic film 44 is a crystalline alloy, the glass material can be selected from a wide range of operating temperatures of 800° C. or lower. On the other hand, in the case of valve crystalline alloys, those at least below the crystallization temperature are selected;
It is necessary to make glass with a low melting point at a working temperature of 500°C or less. iv) Step (e) removes the unnecessary non-magnetic material 45 and metal magnetic film 44 of the block obtained in Tamana 1 (d), and creates an operating gap made of the metal magnetic film of the desired track @t. The removal method (1), which is the step of exposing the formed surface, is performed by grinding and polishing, and in order to obtain a gap abutting surface, the final finish is a mirror-polished surface. Mirror polishing is carried out until the above-mentioned 1 to 100 mm is obtained. ■) In step (f), prepare a pair of blocks obtained in step (e), form a coil winding groove 46 in at least one block -4, Q-1', and then form a groove 46 for coil winding on the camp forming surface.
This is a process in which a non-magnetic material such as o21 glass is sputtered to a required thickness to form a gap forming film. vi) Step (g) is the earth odor of the pair of blocks. In this step, the gap abutment surfaces of the earthy odor are butted against each other so that the track portions match each other, and heated and pressurized to form a bonded body. In this case, if the non-magnetic material 45 filled in the groove is glass, the bonding is performed by mutual glass;
When resin is used, a cutout groove is separately provided in a part of the coil winding window and the rear joint part, and the resin is used. vii) FIG. 8(h) shows the magnetic tape sliding surface of the joining block 47 obtained in step (+-). The process (ch) is 1
This step is to obtain a plurality of composite magnetic heads by cutting the core to have the required core width 'r shown by the dotted line with the rack width as the center. In some cases, it is cut at an angle of azimuth. In this way, a narrow track composite magnetic helad core having a structure as shown in FIG. 8, the magnetic tape sliding surface of which is shown, is obtained. By winding a coil around this, the composite magnetic head of the present invention can be obtained. Embodiment 2 FIGS. 5(a) and 5(b) are a perspective view and a plan view showing the structure of a composite magnetic head in another embodiment of the present invention. Generally speaking, the cut grooves are formed only on the front part of the magnetic helad core, that is, on the surface facing the recording medium, and the rear part is in contact with the entire width of the ferrite core. In this way, even for a magnetic head having a narrower rack, an efficient narrow track head can be obtained because the magnetic resistance at the rear does not increase. The numerals appended to each are the same as in FIG. 4. In addition, the reinforcing material 33°33'
Various filling groove shapes can be selected depending on the shape of the grinding wheel, and in all cases, the ferrite projections 35° and 35' widen as they move away from the working gap, creating a predetermined azimuth loss and reducing crosstalk. is planned. Further, it is desirable that the ferrite protrusion be brought close to the working gap portion, since eddy current loss near the working gap surface can be reduced. In the case of the magnetic head having the structure shown in FIG. 5, it is preferable to provide a cutout groove in the joint at the rear of the core and fill it with reinforcing material 36. In the composite magnetic head of Example 1, when manufacturing it,
As shown in Figure 8 (a), a groove can be formed in the gap, and it can be divided into small blocks later, which makes it suitable for mass production. The contact area of the core portion is narrow and the magnetic resistance at the rear of the core becomes high, which is undesirable. Furthermore, even if the track widths are matched at the front (the face side of the magnetic recording medium), misalignment occurs at the rear, and if the track width is less than 10 microns, there may be almost no contact between the magnetic parts. be. To solve this problem, the composite magnetic head of Example 2 has a high magnetic permeability ferrite 1-floc'-0 as shown in FIG.
This problem is solved by forming a notch groove 4.2.42' on the ridge. Thereafter, a magnetic head is obtained by the steps starting from FIG. 8(c). The completed head is the 5th
A composite magnetic head as shown in the figure is obtained. Other examples of various groove shapes and processing methods are shown in FIGS. 10(1) to 10(d). FIG. 10(a) shows grooves 42 and 42' machined using a shaped grindstone with a 7-shaped tip. In this case, if the angle O of the groove is too large, the angle 0' of the protrusion 48 will become large, and after forming the metal magnetic film, it is polished to obtain the dimensional accuracy of the track @t as shown in FIG. 8(E). The dispersion becomes larger. On the other hand, if the angle 0 is made small, the protrusion becomes mechanically weak in the case of a narrow track, and may be chipped during machining. Therefore, the protrusion angle θ' is preferably about 45 to 90 degrees. However, it can be manufactured outside this range and is not limited thereto. On the other hand, as shown in FIG. 10(b), only the tip of the protrusion 48 can be made rectangular, but in this case, it is preferable that the tip of the protrusion does not have a flat portion. This processing method may be by machining h=, but it may also be by processing the corners as shown by dotted lines 49 by a reverse sputter link method before depositing the metal magnetic film. The above-mentioned groove machining is carried out in two steps as shown in Fig. 10(c).
If a stack of grindstones 50 is used, protrusions can be formed at the same time. Further, as shown in FIG. 10(d), if a multi-wire saw is used, it is possible to process a large number of blocks at the same time. In this case, the shape of the groove 42 is U-shaped.
Additionally, laser processing and holing techniques can be applied, and these techniques may be used in combination. Embodiment 3 FIG. 6 shows a plan view of a composite magnetic head in still another embodiment of the present invention. This figure shows an enlarged view of the magnetic tape sliding surface. The bonding surface of the tip of the ferrite protrusion 35°35', which is the core of the metal magnetic film 30.30', is as follows:
Even if a portion parallel to the working gap surface is formed, if the width a of the ferrite protrusion is less than 1/2 of the rack width t, the contour effect during reproduction will be less than Q,5 d B, causing almost no problem. At this time, it is more preferable to process the tip of the ferrite protrusion so that it is not flat6. Embodiment 4 FIG. 7 is a schematic plan view of a composite magnetic head in another embodiment of the present invention. , shows an enlarged view of the magnetic tape sliding surface. In the magnetic head of this embodiment, the operating gap portion 32 is formed by a metal magnetic film 30, 30' and a magnetic film h35, 35'.
The width of the metal magnetic film constituting the rack width 1 is at least twice the width of the ferrite 1. In this way, in the case of recording, the metal magnetic material part having a high saturation magnetic flux density is dominant, and in the case of reproduction in particular, the 71941~ part with high magnetic permeability is dominant, and the overall reproduction efficiency is improved3. , 9, If the width to the Ferrite 1 is wide, recording in the center of the track will be insufficient, and the reproduction output will deteriorate. As explained above, the composite magnetic head according to the present invention uses a metallic magnetic material with a high saturation magnetic flux density that can be sufficiently recorded even on a recording medium with a high coercive force, and a Ferrite 1~ etc. that has high magnetic permeability and high wear resistance. By combining and compensating for each other's shortcomings,
It is a narrow track magnetic head with excellent recording and reproducing characteristics. Note that although the illustration of a coil is omitted in each drawing showing the magnetic head, it is assumed that the coil is attached. As explained in F-F below, the composite magnetic head of the present invention has the following features:
Compared to conventional composite magnetic heads, it has a structure that (1) reduces eddy current loss; (2) The contour effect is ignored. (3) There are structural advantages such as a wide contact area between the metal magnetic film and the ferrite, and excellent head performance can be obtained. (Since the 41-sheet metal magnetic film is used twice in the working gap, the deposition time for the metal magnetic film is halved, making it suitable for mass production. (5) When determining the width of the l-rack, There is no need to process the side surface of the magnetic film with a grindstone, and there are no problems such as chipping, flaking, or peeling of the film at the processed part. (6) Since it is filled with a non-magnetic +1 reinforcing member, the media M
It/i wa becomes Nfl, etc., the medium is not damaged, and the strength of the entire head is guaranteed. There is also no uneven wear. It has the following major advantages and is easy to manufacture.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a J= plane view of a conventional composite magnetic spatula 1-, FIG. 3 is a perspective view of another conventional composite magnetic head, and FIGS. 4(a) and (+ )) is a perspective view of a composite magnetic head according to an embodiment of the present invention and an enlarged view of a magnetic tape sliding surface, FIG. 5(a). (■)) is a perspective view and an enlarged view of a magnetic tape sliding surface of a composite magnetic head according to another embodiment of the present invention, and FIGS. 6 and 7 are composite magnetic heads according to still another embodiment of the present invention. 8(A) to 8(S) are explanatory diagrams of the manufacturing process of the composite magnetic head of the present invention, and FIG. A perspective view of a ferrite block, Fig. 10(a), (
b) and (d) are weights [
1z plane view of the ferrite block, Fig. 10(c)
Ferrai I-block additive used in undeveloped production]
, a sectional view of a grindstone, and FIGS. 11A to 11E are explanatory views, a perspective view, and a plan view of each step of a conventional method for manufacturing a composite magnetic head. 30.30' Metal magnetic film, 31.31' High magnetic permeability ferrite block, 32
Working gap, 33.33' ・Non-magnetic filler, 3
4. Coil winding window, 35.35' - Ferrite protrusion, 40. High magnetic permeability ferrite block, 41... Gap formation side surface, 42.42'... Groove, 44. Metal magnetic film, 45・・Non-magnetic material, 47 Joint block, 5
0.Whetstone.

Claims (1)

[Claims] 1. Magnetic material is coated on both sides of the protrusion of two base blocks each having a protrusion whose width increases as the distance from the tip increases, and a magnetic material is applied to the protrusion at the tip of the protrusion through an actuation gap. A composite magnetic head characterized in that the magnetic bodies face each other, and a space formed by the magnetic bodies on opposing sides of the projections of the two base blocks is filled with a non-magnetic substance. 2. The composite magnetic head according to claim 1, wherein the magnetic material is an amorphous alloy. 3. The composite magnetic head according to claim 1, wherein the magnetic material is crystalline. 4. The composite magnetic head according to any one of claims 1 to 3, wherein the nonmagnetic material is at least one of glass, ceramic, and resin. 5. Claim 3, wherein the melting point of the non-magnetic material is lower than the crystallization temperature of the amorphous magnetic material.
Composite magnetic head described in Section 1. 6. The composite magnetic head according to any one of claims 1 to 5, wherein the working gap forming surface is made of only the magnetic material. 7. The width at the tip of the protrusion is 1/1 of the track width.
7. The composite magnetic head according to claim 6, wherein the magnetic head is 2 or less. 8. The composite magnetic head according to claim 6, wherein the width at the tip of the protrusion is approximately 0. 9. The composite magnetic head according to any one of claims 1 to 5, wherein the thickness of the magnetic material is 1/2 or less of the track width. 10. The composite magnetic head according to claim 8, wherein the thickness of the magnetic material is approximately 1/2 of the track width. 11. The composite magnetic head according to any one of claims 1 to 5, wherein the working gap forming surface is comprised of the magnetic material and the base block. 12. The composite magnetic head according to claim 11, wherein the width of the magnetic material in the track width direction on the working gap forming surface is at least twice the width at the tip of the protrusion. . 13. The composite magnetic head according to any one of claims 1 to 12, wherein the base block is made of Mn-Zn ferrite or Ni-Zn ferrite. 14. The composite magnetic head according to claim 13, wherein a part of the magnetic material is removed to form part or all of the coil winding groove. 15. The magnetic material is Fe-Si alloy, Fe-Al-Si
The composite magnetic head according to claim 1, wherein the composite magnetic head is made of an alloy, a Ni-Fe alloy, or a high magnetic permeability amorphous alloy. 16. The composite magnetic head according to claim 1, wherein the magnetic material has a multilayer structure. 17. Claim 16, characterized in that the magnetic material has a multilayer structure in which non-magnetic materials are alternately laminated.
Composite magnetic head described in Section 1. 18. The composite magnetic head according to claim 17, wherein the non-magnetic material is SiO_2 or Al_2O_3. 19. The composite magnetic head according to any one of claims 16 to 18, wherein the multilayer structure is formed by a sputtering method. 20. According to any one of claims 1 to 19, wherein the apex angle of the protrusion or the angle formed by both side surfaces of the protrusion is 45° to 90°. composite magnetic head.