DE1210455B - Process for the simultaneous manufacture of a plurality of strip-shaped gap magnetic head cores - Google Patents

Description

Process for the simultaneous production of several strip-shaped Gap Magnetic Head Cores The invention relates to a method of simultaneous manufacturing several strip-shaped gap magnetic head cores as well as a multi-track magnetic head arrangement produced therewith with a number of single heads.

The invention aims to create a single or multi-track magnetic head, which is suitable for recording, playback and erasing and its gap-forming Parts are formed as a structural unit, and includes a novel. Procedure, to manufacture such a magnetic head.

There are already several such heads as well as methods for their endorsement and simple manufacture, especially for mass production, has become known. So a single or multi-track magnetic head has already been described, its magnetic Circle consists of two symmetrical U-shaped halves, creating the individual parts are easily interchangeable and the sound carrier alternates along one of the interruption points can be performed. In this magnetic head, the plane of one core part closes an angle different from 180 ° with the corresponding plane of the other core part one, wherein in the compressed position the consisting of a plurality of lamellae Core parts are fixed against each other by means of a bracket and enough space is created to apply the excitation coils to the cores, with the purpose of Saving of sound carrier material was sought afterwards, the air gaps different magnetic individual circles as close together as possible. With this magnetic head the core parts are pressed together by means of a U-shaped leaf spring, whose Ends attached to the bracket and clamped the core parts between the legs are, so that a releasable attachment for the purpose of more precise adjustment of the air gaps After it was already known, structural units are created to form gaps Manufacture parts using bolts or clamping holders.

It is also easy to manufacture and consists of a few parts Magnetic head has become known, the core leg of which consists of two L-shaped flat Sheets are formed which are pressed together parallel to one another by means of screws , with a housing comprising these parts serving as a common holder.

Furthermore, one is even easier to manufacture and consists of only one Core sheet of existing magnetic head, in particular for wire-shaped sound carriers, has become known, whose core sheet has two notches with recesses around the quenching and signal coils to raise.

These known arrangements have the common disadvantage that they do not have a well-defined, very small gap that can be found after machining can no longer change. The known methods of manufacturing such magnetic heads have the disadvantage that the magnetic head surfaces are not sufficiently uniform and can be edited accurately.

To eliminate these disadvantages are in the method according to Invention either two square ferromagnetic sheets or several pairs of sheet metal strips on a non-magnetizable metal strip with a non-magnetizable one in between Split foil at the adjoining ends, preferably by spot welding, connected, then polished the surface that will later give the head mirror, then strips corresponding to the width of the head are separated from the arrangement by bending brought into their final shape and annealed and hardened in a known manner. That Offer manufacturing methods and the magnetic head produced therewith according to the invention a number of special ones compared to the known manufacturing processes and magnetic heads Advantages in the creation of a structural unit for the gap-forming parts, which can be used for many purposes in systems with any sound carrier, for example also with calculating and booking machines.

The main advantage of the method according to the invention is that a relatively large area can be polished much more precisely in a plane-parallel state. Farther becomes when two relatively extensive surfaces are in parallel positional relation with a certain maximum error can be brought, this by the number of head units divided, which are formed by the expanded surfaces, so that also the error only occurs proportionally in the individual head units. Furthermore are the successive columns in a multi-track magnetic head automatically more precisely Orientation across the tape. This is of great importance with regard to the possibility of to play back a tape recorded with one head with a second multitrack head, without interference factors with regard to the timing between the corresponding channels to introduce. This is particularly important when used in calculating machines and the like.

Another is according to the invention. the resulting advantage is that it is safe and immovable fastening of all parts forming the gap to a common base, with . the core legs attached to it a variety of modifiable embodiments, for example, multi-track or multi-gap heads, individually or in combination.

Another advantage is that due to the manufacturability a very narrow, precisely formed, elongated gap, the core legs more or less wide, bent or at an angle to one another around the gap arranged and also beveled at the adjacent edges ..

An advantageous embodiment of a multi-track magnetic head arrangement with a number of individual heads, which are arranged adjacent to one another, is created for example using the aforementioned manufacturing method according to the invention in that a number of magnetic head units on a common non-magnetic Support element is attached.

This becomes a major advantage of such a magnetic head arrangement achieves that all gap-forming parts and the strip contact surfaces are made of metal and annealed and hardened together as a unit after all major Edits have been carried out. In this way all beneficial effects remain of the annealing, in contrast to the magnetic heads built so far, in which it was common practice to remove the pole pieces prior to the final machining and grinding operations to anneal and harden.

Further details, features and advantages of the present invention can be found in the detailed description below in conjunction with the. drawings be seen. In the drawings, F i g. 1 is a side view of a schematic Arrangement of two core leg plates made of ferromagnetic material, which are attached to a non-magnetic pad according to an embodiment of the present invention are attached.

F i g. FIG. 2 shows a top view of the core leg plates of FIG. 1 with a Representation of the - welding points between the sheets and the non-magnetic base, FIG. 3 shows a partial side view of the structure according to FIG. 1 in a selected Type of execution, with a high pressure on the opposite edges of the metal sheets can be used to reduce the gap therebetween, FIG. 4th a plan view similar to FIG. 2, showing the process step, in which the laminations in the transverse direction in a plurality of individual pole piece arrangements or core leg pairs can be subdivided as structural units.

F i g. 4 A is a top view similar to FIG. 4, although a different type of sheet metal division is shown, FIG. FIG. 4B shows a side view of a device according to the method of FIG. 4 A manufactured magnetic head, F i g. 5 shows a plan view of a pair of core limbs which are fastened to a metallic fastening strap according to a selected embodiment, FIG. 6 is an enlarged partial side view of the structure of FIG. 5, FIG. 7 is a partial section showing a metallic tape guide attached to a single pole piece assembly in accordance with a further embodiment and showing the sound carrier in section as it cooperates with the guide, FIG. 8 shows a pole piece arrangement in which. the legs are bent to accommodate the excitation winding and which represents the manufacturing stage in which the core legs are pressed against the non-magnetic base at its gap parts during the bending, FIG. 9 a magnetic head with the pole piece arrangement of FIG. 8th; .

F i g. FIG. 10 shows how a magnetic head having the type shown in FIG i g. 5 shown mounting bracket is installed in a metal housing; F i g.-11 shows a modified embodiment according to the present invention, in which a pair of core legs is spot-welded to a non-magnetic base is used to remove recessed parts to construct a multi-gap head to enable F i g_ 12 the type of manufacture of the multiple head according to FIG. 11 wherein the ends of the ferromagnetic core legs for receiving the excitation coils are turned, F i g. 12 A shows a cross section of the head from FIG. 12 and an embodiment for magnetic compensation of crosstalk between working gaps of a multiple head, F i g. 13 shows a production stage of a modified method according to the invention, a number of magnetic sheets being tapered in the same way with one Edge to be manufactured.

F i g.14 a further form of training in which the according to F i g. 13th beveled edges on a substantially V-shaped non-magnetic base are attached opposite one another, F i g. 15 a pole piece arrangement with curved Core legs according to the in F i g. 4 or 11 separation shown, F. i g. 16 the way in which the opposing Pälteile of the rig.15 all-round can be used to create a smooth tape guide surface, FIG. 17 another Modified embodiment according to the invention, wherein the edges of two metal sheets made of ferromagnetic material on opposite sides at the end of a third Plates are arranged to form two narrow gaps for arrangements according to F i G. 4 and 11, FIG. 18 a combined deletion, recording and playback arrangement, which, according to the construction of FIG. 17 is executed, FIG. 19 a according to your structure the F i g. 17 modified magnetic head and FIG. 20 one of the F i g. 17 similar Construction, with the corresponding column through the end parts of separate sheets be formed to veYweriden the column in separate heads or into one Multi-gap head unit with a larger gap between the gaps than the head unit of FIG. 18 can be combined.

In the case of the FIGS. 1 to 10- illustrated embodiment of the Invention have two rectangular sheets 10 and 11 elongated Kantere, the polished smooth and of suitable shape to be the pole faces of a magnetic head for magnetic recording, which can form playback or erasure. For example, the edges of the sheets, as at 12 in FIG. 1 shown, be rejuvenated. The edges of the sheets are arranged opposite one another, wherein a gap 13 filled with non-magnetic material is placed between the edges is. This gap can be made from B'eryllium-Küpfer, copper; Platinum or from another Metal or of a material with a relatively high melting point in relation to on the llärteterüperatui 'for the. Magnetic material of the sheets 10 and 11 exist. The gap 13 can have a typical width of 0.00'25 to 0.00625 mm, while the gap material consist of an electroplated, barren, vapor-deposited filin can that on the opposite end edges of the sheets for simplification the handling is applied.

The metal sheets 10 and 11 are clamped tightly against one another with the end faces on a non-magnetic base 16. The clamping device 17, 18 exerts a strong pressure against the outer ends of the metal sheets and acts in this way as a clamping device for holding the opposing edges of the metal sheets for precise adjustment of the gap. While the edges of the sheets are pressed against each other in this way, the sheets are attached to the non-magnetizable base 16, which can consist of a copper-silicon alloy, a nickel-chromium-iron alloy, non-magnetic, stainless steel or another material that is suitable for providing a stable surface for defining the position of the opposing edges of the sheet metal. The base 16 should preferably consist of a material with high ohmic resistance in order to reduce the eddy currents.

For the base 16, non-magnetic manganese steel connections are also used suitable.

The way in which the bleach is attached to the non-magnetic base should result in a connection that widdr = the hardening temperature for the change can. Preferably, the sheets are on the non-magnetic base with a Series of weld points attached, which are shown schematically at 25 in FIG. 1 (and F i g. 2) is shown. A series of is preferable to a continuous welding line, since the weld points have lower electrical eddy current losses in the finished Köpf surrendered. The welding points 25 can, Wenti desires, - lie closer to the gap 13; however, if the weld spots are too close to the gap, the welding process can occur make the careful manufacture of the gap pulled.

Then the welding pits can be cleaned and, if necessary, on the splitting part a high pressure by means of one marked 27 in FIG. 3 designated tool applied be, uni the gap 13 because of a driving or disruptive effect of the itself opposite edges of the sheets better, äbzüschleßen. This back pressure can after bending the side legs, as in FIG. 8: därgesteflt, if necessary be applied.

F i g. 4 shows the process stage Heini Schileiden of the metal sheets 10, lfi and the subsequent primary filter = would be 16 across the gap 13 along the cutting lines, as shown at 30, the metal sheets being divided into structural units (FIG. 4) will. Each of these structural units contains magnetic pole strips or Kerrischenkel32 Lind 33, which are attached to a non-magnetic base 34 and one have non-magnetic gap 35.

From FIG. 4 is still ersdheü zti, däß the weld points 25 are so that the cut lines 3 0 extend between adjacent welds': each. A pair of core shackles 32 and 33 is then attached in a suitable manner to the associated non-magnetizable base 34.

The F i g. 4A and 4'13 represent a modified production method according to the present invention, the break 10 'and 11 of FIG. 2 cut lines 63 at an angle to one another, creating curved pole pieces, such as 64 and 65, which are attached to an arcuate non-magnetic strip 66 ( FIG. 4B). The magnetic circuit of the finished head can be closed in any suitable manner, such as by a base strip 67 which the lower ends of the core legs abut. At your head the F i g. 4 B ″, the flat core legs of the pole strips 64 and 65 lie in a common plane parallel to the plane of the non-magnetic strip 66.

As shown in FIGS. 5 and 6, the non-magnetizable base 34 can be attached to, for example, spot welding; as indicated at 37, a fastening tab 36 can be attached and holes 30 for receiving fastening screws 55, 56 (FIG. 10) for suspending the head part in a metallic housing 54 or the like. to have.

'According to' F i 'g: 7, for an assembly unit 31, which in .einem Multi-channel tape (shown in section at 40 ') is to be used, a beard guide support 41 other - the non-magnetizing brackets, supports 34 - are fastened by means of spot welding, where a `welding point is denoted by 42.

As in the Pig. 8 shown; For example, the outer ends 32a and 33a of the core leg pairs can be bent parallel to one another, while their inner ends 32b and 33b are firmly pressed together on the gap part by means of jaws 44 and 45 shown schematically. In this production stage, the assembly unit 31 can be polished on the strip contact surfaces 32b, 33b and finally all further processing, such as bending, grinding and other mechanical work, can be carried out on the finished assembly unit. In this way, the sensitive core material can be completely annealed and hardened without the beneficial effects of hardening in subsequent mechanical processing, as previously required in the manufacture of commercially available heads, being impaired.

The construction unit according to FIG. 8 is in hydrogen at a high temperature, e.g. B. 1000'C (= about 1900 ° F) annealed and hardened if a split foil 35 made of copper is used, otherwise at a higher temperature if a split foil with a higher melting point is used. For a particularly precise work, the cores can be held in a clamping device (with jaws 44 and 45) during hardening so that they can even be thrown easily. and ensure a snug fit in the final assembly without the cores being under tension.

After hardening, the assembly unit 31 is ready; however, this can after that, the tape contact surfaces 32b and 33 are re-polished, although this is automatically taken care of by the tape running over the head.

Like F i g. 9 shows, the construction unit 31 is preferably made in two U-shaped yokes 50 and 51 are inserted, which carry the excitation windings 52 and 53.

F i g. 10 shows how one in FIG. 9 illustrated magnetic head with the fastening tab 36 in a protective housing 54 by means of fastening screws 55 and 56, which go through the openings 38 of the fastening tab 36, can be attached. The protective housing can contain tape guides 58 and 59, which are adjustably fastened by means of tensioning screws 60 guided through slots, with one track of the tape (denoted by 61 in the schematic illustration) running over the opposing inner ends of a core leg pair 31, while the adjacent tracks of the Tape with surfaces such as 54a and 54b; of the protective housing 54 cooperate, which surfaces can consist of magnetic material and act as a magnetic armature. It should be emphasized once again that a head assembly of this type can withstand high temperatures during manufacture or intermittently and has tape mating surfaces which are all made of metal.

The F i g. Figures 11 and 12 illustrate a modified process that creates a multiple head design. Two core leg plates are attached with their opposite edges to a non-magnetizable base 70 in a manner similar to that in FIG. 2, with the exception that the weld points 71 are preferably arranged in groups with a gap so that when the sheets are cut into individual strips (in a manner similar to FIG. 4), all remaining sheet metal strips are removed from the non-magnetizable "Base 70 can be removed and the structure shown in FIG. 11 results with successive pairs of strips or core legs 72, 73, which are attached to an uninterrupted non-magnetic base 70 and form gaps 74. In other words In this modified method, only the metal sheets are cut into strips, since the depth of cut is dimensioned so that the substrate 70 is not cut , the arrangement according to FIG. 11 can also be produced by inserting into the metal sheets in A Slits are ground in to a depth such that the magnetic sheet metal material can be removed without impairing the non-magnetizable base 70. The ground cuts can be quite close together in the event that closely spaced heads are required.

The in the F i g. The head assembly 75 shown in FIG. 12 is derived from the parts of FIG. 11 formed in that the outer ends 72a, 73a are bent parallel to one another to receive windings, as in the embodiment according to FIG. 9, with the coil for each of the outer ends (e.g. 72a) connected to a separate electrical circuit as usual. is. Spacer strips (as shown at 77 in FIG. 12) made of non-magnetic metal are preferably placed on the non-magnetizable base 70 between each mutually adjacent pair of gaps 74 of the multi-track head arrangement for receiving a multi-channel tape, the channels of which run over the corresponding gaps 74 , and for insulation adjacent column applied in the spot welding process. The non-magnetic spacer strips, such as 77, can be attached before bending the outer ends 72 a and 73 a of the unit, or they can, on the other hand, constitute part of the housing in which the multi-head is housed.

Instead of each core leg or pole pair 72, 73 for the recording alternate pairs like 72 ', 73', used as magnetic isolators when wound with compensation coils or are arranged crosswise, as will be explained below. These unused Pole units can be made narrower than those used. The outer ends 72 a and 73 a of the unused poles can be bent away, cut off or with compensation coils, as indicated at 73c, provided in order to prevent crosstalk. the Pole legs of the pairs 72 ', 73' can also crosswise, as in FIG. 12A shown, be bent over each other for magnetic compensation of crosstalk. Be it pointed out that the compensation windings, like 73c, to the excitation coils of the active poles must be connected in such a way that they absorb the leakage flux between counteract neighboring pairs of active poles during the recording and in series induce a voltage with the active coils, which one in the active coils by a leakage flux from those connected to neighboring active pole pairs Channels induced voltage counteracts.

The head can then, as in the previous embodiment, of the desired be subjected to mechanical processing. If desired, you can use. 80 and 81 designated holes in the opposite Ends of the non-magnetized Pad 70 can be drilled. for fastening the multiple head in a metallic one Protective housing in one of the FIG. 10 in a similar manner.

After all of the mechanical processing, FIG. 12 shown Multi-head unit annealed and hardened as in the previous embodiment and with coils in a housing in one of Figures 9 and 10 of the earlier embodiment are housed in the manner shown, for example by means of screws through the Openings 80, 81 go and the multi-gap head assembly is suspended from the metal housing hold tight.

It should be noted that one following the method shown above manufactured multiple head column has that aligned very precisely in a straight line and that the head assembly is an all-metal construction that can withstand high temperatures can. In the prior art heads in which the pole pieces are embedded by embedding Fastened together in a thermoplastic material would produce high temperatures cause the material to flow and the pole pieces no longer in the appropriate position Can maintain a relationship with each other.

In the F i g. 13-16, there is shown another embodiment of the invention wherein a jig 90 is used to chamfer an elongated edge of each of a number of sheets 91 by an angular surface lapping, one chamfered edge being shown at 91a.

Two such sheets 91 are attached to a generally V-shaped non-magnetic base 93, for example by welding points 94, the beveled edges 91 a facing each other with a gap and separated by gap material 96 which has been produced in one of the ways described earlier. The gap can be compressed during welding by bending the sheets 91 and the legs of the V-shaped pad 93 upwards. In some cases, this can be an alternative to the method step according to FIG. 3 represent. The arrangement according to FIG. 14 can either according to the one shown in FIG. 4 or F i g. 11 can be separated in order to obtain either a number of single gap heads or a multiple head. A number of individual split head components, like component 99 in FIG. 15 are bent and has core legs or pole strips 100 and 101 with opposing edges 100 a and 101 a, which form a non-magnetic gap 102 and are attached to a generally V-shaped non-magnetic base 104. The legs 100 b and 101 b of the core legs can be bent parallel to one another, while the gap part is in a clamping device as before. Thereafter, the upper surface of the pole strips 100 and 101, as at 100c in FIG. 16 indicated, can be rounded to create a smooth rounded tape sliding surface for the head unit, which, as shown in FIG. 9 shown, can be installed.

In the F i g. 17 and 18 is a further modification of the procedure shown according to the invention, with two core leg plates ferromagnetic Material 110 and 111 at an end part 112 a of a third sheet 112, which is placed in between will be attached, with the edges of the first two sheets facing each other. These parts are attached to two elongated, generally V-shaped non-magnetic Pads 114 and 115, each on one side of the central sheet 112, approximately through Spot welding as according to the previous method, attached, with the spot welds between the base 114 and the sheet metal 110 with 117, the welding points between the base 114 and the sheet metal 112 with 118 and the weld points between the base 115 and the sheet 111 are designated by 120 and being elongated in this way Gaps 122 and 123 are formed with a gap in this structure. the Heads manufactured in this way can use the cross-field principle, or the gaps can have a wider clearance for normal use of the finished heads. In the case of the cross-field principle, the relative distance between the extinguishing gap and the Receiving gap with reference to the relative number of turns of the quenching winding and the Bias winding such that two each in the area of the receiving gap generated errors are approximately the same size and approximately at right angles to each other get lost. With the cross-field principle, the extinguishing gap is sufficiently close to the receiving gap placed, so that there is a high-frequency field from the extinguishing poles that is on acts on the area of the recording gap and modifies the recording field.

It should be pointed out that a gap material can be applied to the sheet metal 110 in a thickness that produces the gap at 122 , while a gap material can be applied to the sheet 111 in a thickness that produces a gap at 123. Likewise, the sheet metal 112 can also carry the gap material on its corresponding, the gap-forming surfaces. The sheets 110 and 111 .. can be tapered at their flat end faces, as shown at 127, if desired.

The arrangement of the F i g. 17 may be in the in the F i manner shown G.18 be diced into a plurality of separate heads, wherein each pole piece has two outer core leg or Polstreifen 130 and 131, the edges of one end portion 132a opposed to a common leg 132, and an erase gap 134, and a Form record-playback gap 135, the outer poles being attached to the common leg 132 by V-shaped non-magnetic pads 137 and 138 and, as shown in FIGS. 17 and 18 are shown welded. In order to close the magnetic circuits for an assembled head, two U-shaped yokes 140 and 141 (see FIG the outer leg 130 and a recording-playback winding 146 on the outer leg 131.

It should be noted that the mechanical processing and the Annealing the pole piece prior to assembly, as previously described, made will.

It can also, as shown in FIG. 19, the structure according to FIG. 17 are severed into pole piece units, the sheets 110 and 111 yielding core legs or strips 151 and 152 which extend generally at right angles to the common leg 153 formed by the strip 112 ', the strips being attached to one another by V-shaped non-magnetic pads 154 and 155 are attached as in the earlier embodiments. The magnetic circuits are closed by generally L-shaped members 158 and 159 with windings 160 and 161 thereon, which members are attached to the outer ends of strips 151 and 152 and the lower end of leg 153 in a suitable manner. The outer ends of the strips 151 and 152 can be bent downwards, as indicated at 151a, in order, if desired, to obtain a more suitable tape receiving surface and to achieve a more balanced frequency curve.

F i g. FIG. 20 shows a head manufactured by a method which is a modification of that shown in FIG. 17 is in that each of the sheets 110 and 111 is attached to a particular, upright sheet, as shown there at 112, by a method which is easily understood from the description of FIG. 17 can be seen. The finished head construction contains two outer leg strips 170 and 171, each of which is arranged at one end of the leg 172 and 173, respectively, and opposite this. The pole piece of leg strip 170 is attached to leg 172 by means of a generally V-shaped non-metallic pad 175, while a generally V-shaped non-magnetic pad 175 attaches leg 173 to leg strip 171. The U-shaped yokes 177 and 178 complete the magnetic circuit of the pole units. The gap 180 between the leg strip 170 and the leg 172 can be an erasure gap, while the gap 181 between the leg 173 and the leg strip 171 can be a recording / playback gap for a multiple gap head, or the gap can be used in entirely separate heads. In a multiple gap head, the pole units can be installed as separate pieces and placed as close together or as far apart as desired To fill in lamellae of a magnetic material.

Claims (10)

Claims: 1. A method for the simultaneous production of a plurality of strip-shaped gap magnetic head cores; characterized in that either two square -ferromagnetische sheets (10; 11); be connected with the interposition of a non-magnetizable gap film (13, 74) to the adjacent ends or more pairs of sheet metal strips (72, 73) on a nichtmägnetisierbaren metal strips (7 0 16) , preferably by spot welding, that the surface that will later give the head mirror is then polished, then strips corresponding to the head width are separated from the arrangement, by bending into their final shape. brought and annealed and hardened in a known manner. 2. The method according to claim 1, characterized characterized in that the severing involves making a series of transverse cuts by the sheets (10 ', - 11) and the urimagnetic strip (16) encloses to Divide the sheets into several pairs of core legs, each core leg being one Pair of opposite poles - those on a part of the non-magnetic Underlay are attached. 3. The method according to claim 2, characterized in that that parts of the sheets (10, 11) are removed to the pairs standing at a distance Manufacture core legs. 4. The method according to any one of the preceding claims, characterized characterized in that said strips are bent into the final shape and that the resulting structure is annealed. 5. The method according to claim 1, characterized in that the severed strips are bent so that they form generally parallel legs which extend over the non-magnetic metal strip extend out on its opposite sides and form a subassembly, that the partial assemblies are annealed and that they form closed magnetic circuits are assembled with the legs and with windings, which chain these-magnetic circles. 6. The method according to claim 1, characterized characterized in that the elongated edges of the pair of strips of magnetic Material to be ground and polished; that on at least one edge a layer made of non-magnetic material of a predetermined thickness and having a melting point which is the annealing temperature for the strips of magnetic material is applied and that the strips are arranged so that they -a flat surface of a elongated support made of non-magnetic material -overlap, whereby the Edges of the strips are opposite at a distance which is the thickness of the layer of the intervening non-magical material... corresponds. 7. Procedure for Manufacturing a multitrack magnetic head according to claim 1; characterized in that a pair of sheets of magnetic material on a non-magnetic base in Spaced parts of this pad is attached, with end parts of the corresponding Sheet metal are close together so that the sheets are cut through in order to be spaced Remove any lying loose parts from the sheets to form strips; and that non-magnetic strips of conductive material on the non-magnetic base be attached between adjacent magnetic strips attached thereto. B. procedure for manufacturing a magnetic head according to any one of the preceding claims, characterized in characterized in that the opposite edges of the pair of strips beveled before the said strips are attached to the non-magnetic base. 9. The method according to any one of the preceding claims, characterized in that one or both end faces of the pair of magnetic strips are electroplated or vapor-deposited film deposited thereon and that these end faces are placed opposite each other, the electroplated or vapor-deposited film limits the non-magnetic gap in between. 10. Multi-track magnetic head arrangement with a number of individual heads which are arranged adjacent to one another and produced by the method described in the preceding claims, characterized in that a number of magnetic head units (F i g. 11) are attached to a common non-magnetic support element (70) . References considered: U.S. Patent No. 2,555,110.