KR100265209B1 - A magnetic transducer and manufacturing method therefor - Google Patents

Abstract

The magneto-converter for reproducing / recording high frequency signals with magnetic tape media comprises a pair of opposing pairs of transducer heads separated by insulating gaps and joined together to form a Y-shaped pole structure, each half conducting layer on the opposite surface. And at least partially ferromagnetic core portions stacked in contact with each other, the conductive layers each forming a winding coil portion. Each core section is formed as half of a Y-shaped cross-section array having leg portions and angularly arranged arm portions, the far ends of which are covered with a block-shaped ferromagnetic magnetic pole, and the two magnetic poles are gaps. Lies in a common plane traversing the plane. The conductive layers on the outer and inner surfaces of the laminated core section form outer and inner conductors arranged to form one or two rotary coils for the transducer when conductively interconnected, such as by jumpers. The inner conductor is an inverted, generally U-shaped arrangement with the curved portion of the two inner conductors passing through and substantially filling the Y-shaped openings on the opposite side of the insulating gap layer below the poles.

The method of making a magnetic transducer generally has at least two generally identical transducer head halves, each having a half of the Y-shape, a surface shaped to form the core arrangement and a band shaped to form the polar arrangement. Starting with providing a support; Applying a conductive layer to the surface providing the outer coil conductor, and alternately applying a single layer of insulating and magnetic material to form a laminated core section; Applying a conductive layer over the insulation layer around the surface and side edges of the laminated core section to provide an internal generally U-shaped coil conductor; At the far end of the core section arm a pole portion of the magnetic material is formed in the band; Coupling the two transducer heads half to each other to form a Y-type transducer in which the coupling material insulates and forms a gap between the two pole portions.

Description

Magnetic transducer and manufacturing method thereof

1 is a schematic perspective view of a high frequency magnetic transducer of the present invention.

FIG. 2 is an exploded perspective view of the transducer of FIG. 1 with a partially broken down portion, which schematically depicts the main elements of the transducer.

3A to 3M are schematic perspective views showing sequential method steps used in the manufacture of the stacked high frequency magneto-electric converter of FIG.

4 is an enlarged perspective view of an individual stacked high frequency magnetic transducer of the present invention.

5 is a bottom perspective view of a laminated high frequency magneto-optical transducer of the present invention illustrating jumpers connected to a conductor strip on the bottom of the transducer in a two-rotation shape.

6 is a top perspective view of the stacked high frequency magneto-optic transducer of FIG. 5 illustrating an integrated preamp connected to a conductor strip on top of the converter.

FIG. 7 is a phase plan view of the red frequency high frequency magnetic transducer of FIGS.

FIG. 8 is a front plan view of the high frequency magnetic transducer of 4-6 degrees.

FIG. 9 is a cross sectional view generally taken along line 9-9 of FIG.

FIG. 10 is a cross sectional view generally taken along line 10-10 of FIG. 8; And

FIG. 11 is a cross-sectional view of the leads and jumpers shown generally along line 11-11 of FIG. 8 corresponding to the electrical connections shown in FIGS. 5 and 6.

* Explanation of symbols for main parts of the drawings

20: converter 21: head section

22 support body 24 laminated magnetic core section

25 insulation gap layer 26 inner conductor

26a: curved portion 27: insulating layer

28: outer conductor 30: pole end

38: notch 40: magnetic pole band surface

44: stimulus notches 46: photoresist

50, 51: thin layer of magnetic or insulating material

58: gap plane 59: glass

61: cutting line 64, 66: jumper

70: small integrated circuit preamp 72, 74: lead

The subject matter of the present invention relates to the subject of a concurrently filed patent application entitled "Small Core Metal Head Converters and Methods for Making thereof" by Beverley R. Gooch, who is assigned to the assignee of the present invention.

The present invention relates generally to magnetic head transducers and, more particularly, to laminated high frequency magnetoelectric transducers for heads for use as magnetic tape media and to methods of producing such transducers.

The performance of the magnetic tape recorder is highly dependent on the properties of the magnetic materials used to make the recording heads and tapes and the structural shape of the materials affecting their magnetic properties. Magnetically hard materials characterized by high residual magnetism, high coercivity, and low permeability are mainly used for the production of recording tapes and other related recording media. On the other hand, magnetically soft materials exhibiting low complementarity, low residual magnetism, and relatively high permeability are generally used to produce magnetic cores for heads, which are means by which electrical signals are recorded and reproduced from magnetic tape.

In the case of a video recorder, a typical annular magnetic video head consists of two high permeability magnetic cores with a coil and a nonmagnetic gap spacer to which signal information is connected. The recording video head is a transducer that converts electrical energy from the signal aperture into a magnetic field emitted from a physical gap in the video head which prints a magnetic pattern on magnetic tape in proportion to the electrical signal. In contrast, a playback video head is a transducer that collects flux from magnetic tape across a physical gap and converts it into an electrical signal proportional to the recorded flux.

Typically ferrite materials have been used as magnetic materials in video heads. The bleeding of high-definition videotape recorders, digital videotape recorders, etc. has accelerated the trend towards high density structures for recording very large amounts of information by the resulting use of high-magnetism recording media such as metal powder media, metal vaporization media, and the like. . As part of this development, it is consequently required to increase the frequency of the information signal recorded on the medium. Conventional ferrite cores simply cannot provide the desired properties to achieve the required performance for the application. Its inherent brittleness makes it impossible to produce ferrite cores in narrow track butterflies or thin magnetic core stacks, as the resulting chipping and breaking of ferrite material cannot be ruled out during the manufacturing process.

In addition to manufacturing problems associated with ferrite heads, there are also performance problems, specifically when the heads are used with high magnetic flux magnetic tapes, especially during the recording process. During recording, a larger signal is required by the high coercive magnetic tape than by conventional magnetic tape. Since the signal level from the tape is very small, the problem is not serious by the use of the ferrite head during the regeneration. The higher the recording signal and the smaller the head, and at playback or "playback" the signal tends to saturate the ferrite head. It has also been observed that there is a significant noise level resulting from the contact of the ferrite head with the high magnetomagnetic magnetic tape, and then more signals are needed to achieve an acceptable signal to noise ratio. Bulk metal heads also have performance drawbacks, one of the more significant drawbacks being that they have poor high frequency response mainly due to eddy current loss.

This consideration results in the use of any number of other commercially available magnetic materials with higher flux density saturation in the recording head, which are cobalt-zirconium-niobium (CZN) alloys, iron-aluminum-silicon alloys Alfesil, Sendust, Spinalloy, or Vacodur, each having a nominal composition of 85% iron, 6% aluminum, and 9% silicon and also amorphous metals.

Apart from the magnetic properties of the head core materials used, the main design items that dictate the performance of the video heads are track butterfly, gap length, gap depth, core cross-sectional area, and other core morphologies (eg, path length). Each of these parameters should be selected according to the design standards of the magnetic tape recorder, while at the same time maintaining the head efficiency as high as possible.

Therefore, there is a significant need for improved high frequency magneto-transducers that have short paths to lower core reluctance and that reduced core reluctance is less dependent on the permeability of the magnetic material used in the magnetic core. In addition, eddy current losses and other frequency effects should be minimized. In addition, the excitation stage should be minimized and leakage reluctance should be reduced. Ideally, the head should provide a good high frequency response and have such properties that saturation of the core material does not occur at normal recording levels. The manufacture of such transducers must be mass production, high precision, low cost and achieve high uniformity. The present invention fulfills these needs and provides additionally related advantages.

According to the present invention, an improved magneto-converter for reproduction and / or recording high frequency signals by a magnetic tape medium comprises opposing pairs of transducer head halves separated and joined together by an insulating gap. Each transducer head half includes a stacked at least partially ferromagnetic core section coupled onto opposing surfaces with a conductive layer that forms a respective signal coil portion. Each core section is formed in a half of a Y-shaped cross-sectional shape having a leg portion and is disposed at an angle to the arm portion. The two transducer head halves are positioned and joined to the leg portion in contact with the bonding material forming the insulating gap. At the distal end of each arm, a ferromagnetic magnetic pole piece in the form of a block is placed in the path associated with the laminated core part and extends into the V-shaped intermediate part, where the peripheral end is in contact with the insulating gap, and two magnetic pole pieces which are usually placed in a plane Cross the plane of the gap.

Each laminated core portion consists of a first insulating layer followed by a plurality of alternating magnetic and thin layers of insulating material. The conductive layers on the outer and buried surfaces of the laminated core section form outer and inner conductors that are shaped to form one or more rotating coils in the transducer, for example when conductively interconnected by jumpers. The inner conductor is generally inverted U-shaped with two bent portions of the inner conductor passing through and substantially blocking the Y-shaped openings on opposite sides of the insulating gap layer below the pole piece. The leg of the inner conductor spans two legs in the laminated core section. Since both the inner and outer conductors are wider than the butterfly in the laminated core section, after cutting the support block thinly or diced in the formation of the individual transducers, the edges of the inner and outer conductors are formed by a jumper for forming a winding coil. It is close to the surface for attachment.

The preamp device can be attached directly to the transducer and is formed electrically connected to the end of the coil, thereby providing a short lead from the transducer coil to the preamp, so that the capacitance associated with the long lead at high frequencies (eg 100 to 150 MHz) And reduce inductance losses.

Generally, the method of manufacturing a magneto-transducer starts by providing a support having a shaped surface that determines the core shape and a shaped band that determines the magnetic pole shape, generally at least two generally each having a half Y-shape. Form the same transducer head half; Applying a conductor layer to the surface to provide an outer coil conductor; Alternatively applying an insulating thin film and a magnetic material to form a laminated core structure; Removing selected portions of the stacked core structure to form individual stacked core sections; Applying an insulating layer around the front and side edges of the laminated core section; Applying a second or inner conductor layer over the insulating layer to provide an inner generally U-shaped coil conductor; In the band, forming a magnetic pole piece of magnetic material at the distal end of the arm of the core section; The two heads of the transducer heads are joined oppositely to form a Y-shaped transducer that insulates the coupling material and forms a gap between the two pole pieces.

The entire converter is manufactured by mass production, high precision, and low cost techniques such as material precipitation and photolithography. By batch manufacturing, for a large number of transducers, all magnetic core materials are attached during the same process step and all the conversion gaps are formed simultaneously. This results in a high degree of uniformity for all transducers.

Other features and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate by way of example the principles of the invention.

Referring now to the drawings, in particular to the first and second views, in this example, the support 22, 22 'is a material made of two generally identical workpieces bonded together with an insulating gap layer 25 sandwiched therebetween. Second, a thin film magneto-transducer, denoted generally 20, is formed along the transducer. 1 and 2 are for ease of illustration and description, not schematic and constant proportions. A workpiece manufactured as described below, comprising: first and second head sections, generally designated (21,21 '), formed of first and second stacked magnetic core sections, generally designated (24,24'); A pair of internal generally U-shaped conductors 26, 26 '; A pair of outer conductors 28, 28 '; And a transducer 20 comprising a pair of magnetic poles 30, 30 '. When fabricated as described below, the conductor 20 has a pole end 30, 30 ′ attached to the distal end of the arm portion of the Y-shaped core section 24, 24 ′ and the plane of the insulating gap layer 25. Has a generally Y-shaped cross section extending perpendicular to the direction of the wire, and the connection of jumper wires for forming one or this rotary coil as desired by the inner and outer conductors 26, 26 'and (28, 28'). Close to the surface of the transducer to enable it. As can be seen in FIG. 1, each laminated magnetic core section 24 is sandwiched between an inner layer or conductor 26 and an outer layer or conductor 28, and the terms " inner " and " outer " 20 is used with respect to the plane of the insulating gap 25 on the axial center line. Although the insulation gap 25 is presented as a single element, as will be described, the portion of the insulation gap 25 is attached on each of two similar head sections, and the two layers form a single gap when connected and joined. do. The outer conductors 28, 28 'are generally bent planar, non-porous conductive layers, while the inner conductors are curved portions 26s, which pass through the winding gaps or windows formed by the half-Y-shaped laminated core section 24. 26a ') is generally U-shaped. The legs 26b, 26c and 26b ', 26c' of the conductors 26, 26 'span the side edges of the core sections 24, 24'. As described below, each core section 24, 24 'is provided with an insulating layer 27, 27' covering the inner surface and side edges thereof.

Referring now to FIGS. 3A-3M, the sequential method steps used to manufacture the laminated high frequency magnetoelectric transducer 20 of the present invention will now be described depending on the materials used during manufacture. In particular referring to FIG. 3a, the starting point in the process is a suitable nonmagnetic, non-conductive material such as alumina (Al ₂ O ₃ ), a ceramic such as a mixture of titanium carbide (TiC) and alumina, or a generally elongated material of comparable material. Provided is a thin block support 22. Initially, the support 22 has at least first and second mutually perpendicular surfaces 34 and 36. The support 22 has a thickness of about 0.030 inches and is molded by conventional machining methods or by reactive ion beam etching (RIBE). Bonding knots, generally designated 38, are formed at the bottom of the longitudinal edge of the support 22 (as shown in the figure), the notches 38 being generally perpendicular and having a first surface 34 and a surface perpendicular to it ( It has a surface 38a that is generally parallel to 38b).

At the upper longitudinal edges, ie at the intersection of the two surfaces 34 and 36, the support 22 is generally the first surface 40 parallel to the surface 34, and the second inserted obliquely to the surfaces 34 and 40. It is machined to provide an oblique dent that includes an end surface 40. As will be apparent below, adjacent surfaces 34 and 42 provide a core cross-sectional forming surface that is used as a conformal adjacent surface to yield a half Y-shaped core-section.

Surface 40 serves as a pole end band formed with a number of equally spaced generally identical pole end notches 44, with the lower edges of the notches 44 being the end surface 42 and the surface 40 Together along the line formed by the intersection of The depth of the notches 44 corresponds to the butterfly of the surface 40, and essentially, the rectangular shape and dimensions of the notches 44 are the butterfly of the pole ends 30 (30 ') formed as described and Specify the thickness.

Since the manufacturing method produces a plurality of stacked high frequency magneto-electric transducers 20 from a single support block 22, the number of pole end notches 44 is proportional to the number of transducers 20 generated from the support block 22. In an exemplary embodiment, about several dozen or even several hundred or more will be noted. In order to facilitate the latter manufacturing step, the surfaces defining the core shape comprising the support block 22 and more specifically the surface 34 and the end surface 42 along the pole end band surface 40 It must be a shiny surface, for example by mechanical lapping, and be thoroughly cleaned. An insulating layer of about 1500 kPa (not shown) may be attached on the planar surface 34 and the end surface 40 of the support block 22 to improve the electrical insulation of the support block if desired. Alternatively, a somewhat thicker layer of insulating material may be used with the conductive, nonmagnetic support block 22.

Using the support block 22 manufactured as shown in FIG. 3A, each of the plurality of pole end notches 44 in the pole end band surface 40 was formed using the notches of the volume and shape of the photoresist 46. It is simultaneously filled with a photoresist 46 which is commonly used in photolithography or chemical etching techniques corresponding to the external dimensions of (44). That is, the notches 44 will also be filled as the photoresist surface extends along with the surrounding planar surfaces 36 and 40. Conductor layer 28 of a highly conductive nonmagnetic material, such as copper, is deposited on adjacent surfaces 34 and 42 defining the core shape. Instead of attaching a portion of the conductor layer onto or within the bonding notches 38, only a small portion is attached onto the pole end surface 40. The conductor 28 layer, having a thickness of about 1 mil, can be deposited by any number of conventional techniques, such as sputtering, vacuum deposition, ion plating, and the like. 3B depicts the support block 22 with a pole 28 notch 44 filled with a layer of conductor 28 attached to conformal adjacent surfaces 34 and 42 and a photoresist 46.

Referring to FIG. 3C, a first insulating layer 49 having a thickness of about 100 to 200 microinches is then placed on the conductor 28 layer, followed by an alternating thin layer 50 of high permeability magnetic and insulating material. 51) is attached. As shown in FIG. 3C, the laminate extends over the top end surface 42 to cover the pole end band surface 40. The thin layer of magnetic material 50, each about 40 microinches thick, can be any number of commercially available magnetic materials, such as cobalt-zirconium-niobium (CZN) alloys, 85% iron, 6% aluminum, and 9%, respectively. Silicon, and also iron-aluminum-silicon alloys, including alpesyl, sendust, spin alloys, or barcodeles having a nominal composition of amorphous metals. Alumina (Al ₂ O ₃ ) or silicon dioxide (SiO ₂ ) is a suitable material for the thin insulator layer 51 having a thickness of about 1 or 2 microinches. In addition, the thin insulator and magnetic material layers 50 and 51 can be attached by any conventional technique such as sputtering, vacuum deposition, ion plating, or the like. For the purpose of illustration and space limitation only, the number of magnetic material layers 50 and insulating layers 51 may be that whatever the number of magnetic layers 50 is, the insulating layer will be on its outer layers; Furthermore, in some applications the number of magnetic layers may be as high as ten (10) or twelve (12), but two are shown in figure 3c (as well as the following figures).

As depicted in FIG. 3d, the individual laminated core sections 24 are now formed by removal of the laminate material between the sections. The plurality of core sections 24 are parallel to each other and extend in line with and from one of the pole end notches 44, respectively. The arrangement of core sections 24 is formed by selectively removing all of the laminate layers 50, 51 and bottom insulating layer 4 thereby exposing the conductor 28 layer as depicted in FIG. 3d. For selective removal of the material, reactive ion beam etching (RIBE) can be used or photochemical etching can be used using developed photoresist. As shown, the material has been removed from between the adjacent pseudocore sections 24, and the top or peripheral ends of the core sections 24 are planar to each other and will lie in a plane generally perpendicular to the plane of the surface 40. The material was removed along the pole end band surface 40 until it was removed. As shown, each laminated core section 24 is parallel to an adjacent similar core section 24.

Referring to FIGS. 3E and 3F, after the laminated core sections 24 are formed, the top insulating layer 27 (see FIG. 2) is exposed to the conductor 28 layer, as well as the exposed front of the laminated core section 24. Surfaces are attached as well as the now exposed surface, including the side and normal edges .. The bilayer 27 is a layer of generally uniform thickness that follows the contours of the exposed surface and edges. Following attachment, the entire exposed surface of the workpiece has a layer of conductor 26 attached thereon, the attachment being thick enough to form a surface generally parallel to the original surface 34 of the support block 22. 3f, it can be seen that the surface of the conductor 26 layer is planar to each other with the insulating layer 27 attached to the preceding step, as shown in 3e and 3f, the conductor material layer is a laminated core section 24; ), Between the laminated core section 24 and the lower region, as well as the pole end band surface 40 and the pole end notch ( Sufficient to cover 44. The top conductor layer 26 has dimensions of about 0.5 mils thick in the space between adjacent core sections 24.

Referring now to FIG. 3G, the next step involves the removal of the photoresist 46 in the pole end notch 44 from the pole end band surface 40 on the laminated core section 24. This establishes a common plane through the exposed distal end of the upper vent arm of the laminated core section 24, the plane being perpendicular to the plane of the pole band surface 40 and to the plane of the remaining layer of conductor 26. The two surfaces of the top and bottom edges of the top conductor 26 layer contact the bottom surface of the pole end notches 44 and the bottom edge of the conductor 26 layer is laminated. Removed so as to contact the bottom edge of the core section 24.

As illustrated in FIG. 3h, the pole end notches 44 in the middle of the area along the pole end band surface 40 are masked with a suitable photoresist 56, the portions being generally rod-shaped and each block is block-shaped. It has insertion surfaces that are planar with each other with the top surface 36 of 22 and the remaining surface of the conductor 26 layer. The pole end is then spaced between adjacent rod-shaped photoresist portions 56 above the laminated core section 24 and into the remaining box-like opening including pole end notches 44 in the pole end band surface 40. (30) is sputtered. The magnetic alloy material for the pole end 30 is the same magnetic material used as the thin magnetic layer 50 in the laminated core section 24 and is sputtered in direct contact with the upper peripheral end of the laminated core section 24. In this manner, the pole end 30 forms a continuous magnetic path with similar stacked materials of the laminated core section 24.

Following removal of the photoresist 56 from between the sputtered pole ends 30 (FIG. 3i), the front of the laminated core section 24, the front of the top conductor layer 26 and the pole end 30 Lapping or glazing the front face and the gap facing the surface or plane 31 including the front face of the provides a smooth, flat surface thereon. Planarization using mechanical lapping or RIBE processes can be used for this purpose. During the lapping or calendering operation, substantially all of the insulating layer 27 overlying the core section 24 (see FIG. 3f) is removed to expose the metallic laminate of the core section 24 so that the lapping or calendering operation is performed in the gap plane. Creates a very flat, very uniform plane, referred to as (58). The gap plane 58 is then attached with a gap insulation layer 25 having a half thickness, which is the desired gap spacing (depicted as a single gap layer 25 in FIG. 2) relative to the complete magnetoconverter 20, Half of this is now essentially complete as shown in Figure 3j.

Then, the two separate halves of the transducer 20 or the transducer head sections 21, 21 'are arranged face-to-face, i.e., stacked head core sections 24 arranged in the X and Y directions across the surfaces facing each other. ) And a gap facing surface with a pole end 30 versus a gap facing surface. The surfaces facing the gaps are depicted as reference numerals 24 which are essentially portions shown in dashed lines and which are part of the core section below the gap layer 25a. Similar elements on the section 21 'have the same reference numerals as the head section 21 and then the apostrophe for ease of illustration. The two head sections 21, 21 'are then glass bonded together in a conventional manner as shown in FIG. 3k to produce a block of transducer 20 as illustrated in FIG. With two head sections 21, 21 'fixed together, the lower notches 38, 39' collectively form the first bonding notch. Similarly, a second or top bonding notch is formed in the space between adjacent pairs of coupled pole ends 30, 30 and 30 ′, 30 ′. Glass 59 fills the spaces in these upper and lower bonding notches thus formed.

As illustrated in FIG. 3m, the support blocks 22, 22 'thus connected to the individual transducers 20 are thinly cut or rhombic along the cutting lines 61 shown in FIG. These cut lines 61 will usually be angled with respect to the sides of the support blocks 22, 22 'to create the desired angle for orientation recording. While the individual transducers 20 are thinly sliced at the same time, it will usually be executed to match all slices of the transducers 20 simultaneously in a single pass.

Both layers of conductor 26 and 28 move the entire length of the support blocks 22 and 22 ', which are bonded or fixed. After cutting, the edges of the two conductor layers 26 and 28, as illustrated in the enlarged perspective view of the individual transducers 20 of FIG. 4, may be applied to the transducers 20 below the glass filler 58 around the pole end 30. FIG. Exposed on the surface. To further describe the transducer 20, the bottom, or first, attached conductor 28 layer will be referred to as the outer conductor 28, and the top, or final, attached conductor 26 layer may be referred to as the inner conductor 20. It will be referred to as and will be used to indicate a left hand with a simple numeric representation or a light hand or second half of the transducer 20 with the first half using an apostrophe (').

With the exposed outer conductors 28, 28 'and inner conductors 26, 26' it is possible to connect these conductors and serve as one or two coil turns by the use of suitable jumper hook-ups. Referring now to FIGS. 5 and 6, opposing surfaces of the transducer 20 are depicted, and FIG. 5 shows the outer conductor 28 and the second jumper (connected to the adjacent inner conductor 26 by the first jumper 64). 66 illustrates the remaining outer conductor 28 'connected to the adjacent inner conductor 26'. On the opposite surface, as shown in FIG. 6, jumpers 76 are connected to conductors 26 and 28 ', for example by leads 74 and 72, respectively, to outer conductor 26' by inner conductors 26 '. 28) to obtain a two-turn signal coil shape. Additionally, the small integrated circuit preamp 70 may be placed directly on the opposite side of the transducer 20 as illustrated in FIG. One preamp lead 72 is connected to the outer conductor 28 ′ and the other preamp lead 74 is connected to the inner conductor 26. The arrangement of the preamp 70 physically attached to the transducer 20 allows the transducer 20 to be designed by providing a very short lead from the head turn of the signal coil to the preamp 70, which is related to the long lead at high frequencies. Capacitance and induction loss are reduced.

Additional details of the completed transducer 20 are described in plan views 7 and 8 and in cross sections 9-11. Each transducer 20 includes a pair of opposing stacked core sections 24, 24 'separated by a gap insulation layer 25 separating the corresponding pairs of opposing magnetic pole ends 30, 30'. As best shown in FIG. 9, the tops of the opposing stacked core sections 24, 24 ', each composed of alternating thin magnetic and insulating layers 50, 51 and 50', 51 ', are generally outside. Tapered towards the stack core sections 24, 24 'together to form a generally Y-shaped array. The bottom insulating layer 27, now called the outer insulating layers 27 and 27 ', is disposed on both sides of the laminated core section 24 and 24' after the outer conductors 28 and 28 ', each of the outer conductors facing each other. Is generally consistent with a Y-shaped arrangement of stacked core sections 24, 24 '. On one side of the gap insulation layer 25 is a cross section or curved portion 26a, 26a 'of the inner conductors 26, 26' inside the wide portion at the top of the Y-shaped arrangement (see FIGS. 10 degrees). In the method used, the curved portions 26a, 26a 'combined with the intervening portion of the insulating gap layer 25 substantially fill the neck of the V-shaped winding window formed at the junction of the two arm portions of the core section 24, 24'. do. The magnetic pole ends 30, 30 'are supported on the top of the Y-type laminated core sections 24, 24' supported by the support 22 and bonded by the glass filler 59. The pole ends 30, 30 'are slightly outwardly (outside gap 25 plane) of the outer insulation layers 27, 27' and the outer conductors 28, 28 'of the Y-type laminated core section 24, 24'. About) stretched.

The physical size of the transducer 20 is very small. For example, the length and butterfly of the individual transducers 20 may be about 0.100 inches and the thickness may be about 0.017 inches. More importantly, the size of the magnetic core is extremely small, about 0.005 inches in length of the laminated core section 24 and 24 'and about 0.0005 inches in height of the pole ends 30 and 30'. Also, the heights of the inner conductors 26, 26 'at the center of the Y-shaped arrangement of the stacked core sections 24, 24' may be the same, that is, about 0.0005 inches. The butterflies of the laminated core sections 24, 24 'combined at the wide Y-shaped top end are about 0.002 inches and the butterflies of the combined pole ends 30, 30' are about 0.0035 inches. The depths of the pole ends 30, 30 ′ and the stacked core sections 24, 24 ′ can both be about 0.001 inches.

9 and 10 show dramatically the available magnetic flux paths, and FIG. 10 is a section along the plane of the insulation gap 25 with the insulation removed. Using this size in relation to FIG. 10, the butterfly of the pole end 30 is 0.001 inch and the thickness (vertical size of the bar shown) is 0.0005 inch (corresponding to the gap depth), which is the curved portion of the conductor 26. It is almost the same size as the thickness of 26a. An overall vertical size of about 0.0055 inches from the upper surface of the pole end 30 to the lower edge of the laminated core section 24, which is about 0.0045 in relation to the length of the legs of the core section 24 below the neck of the V-shaped opening. Leave the size of the inch. Therefore, the shaft length of the neck portion is about 10% of the total length of the core section 24. High flux coupling efficiency is obtained as a result of several factors. That is, the gap depth is very small and the coil is placed close to the pole end (i.e., the curved portion 26a of the inner conductor 26 is close to both the read / write interval and the magnetic medium such as tape to be used). The curved portion 26a substantially fills the space between the arm portion of the core section 24 and the insulating gap layer 25, and additionally is formed by a back gap length (adjacent leg portions of the core section 24). ) Is an area substantially larger than the read / write gap area of the opposite magnetic pole.

The small physical size of the magnetic core results in short magnetic length, essentially the distance around the inner conductors 26, 26 '. By having extremely short magnetic paths, the core magnetoresistance is less dependent on the permeability of the core, resulting in a significant gain in flux efficiency in the 100 to 150 MHz frequency range. Permeability in this frequency range can be substantially reduced by eddy current losses and other frequency effects that are minimized by fabricating core sections from thin monolayers. The permeability of the 40 microinch self-alloy monolayer used in this transducer 10 can range from very good 500, while the permeability of the multi-layer core is due to the quality of electrical insulation between the magnetic layer and the induced stress that can develop into many magnetic layers. This value can fall considerably below this value. Therefore, reducing the dependence on core permeability becomes very important to ensure a relatively high flux efficiency at frequencies in the range of 100 to 150 MHz.

Because of the small transducer size, the entire core will contact the magnetic tape moving over the pole ends 30, 30 ′ in a direction perpendicular to the gap 25 plane. The thickness of the pole ends 30, 30 ′ with a gap 25 therebetween limits the orbital width of the transducer 20, which can be installed in any conventional manner on the video head syringe.

Since the pole ends 30 and 30 'are solid magnetic materials rather than laminated, the wear resistance of the pole ends 30 and 30' will be improved. The laminated core sections 24 and 24 'are not exposed to the magnetic video tape because the individual thin insulating layers 51 and 51' of the laminate can act as gaps that will cause waves, commonly referred to as secondary gap ripple.

The inner and outer conductors 26, 26 ′, 28, 28 ′ are closely integrated with the laminated core section 24, 24 ′ which reduces leakage inductance. Conventional thread conductors in thin film converters have a significant leakage inductance that will degrade the performance of the video head. A gap invading the window region by forming a winding window at the confluence of the arm portion of the core section 24 and filling the winding window with the curved portions 26a, 26a 'of the conductors 26, 26' attached substantially ( Substantially all of the flux in and around 25 will be coupled to the winding coil in the window, minimizing or eliminating the leakage flux.

The transducer 20 shown and described herein is designed for high frequency band butterfly systems. As a result of the small core size, there is the possibility of an important "head bump" which arises due to the fact that the ship speed picked up by the extreme of the head core is out of phase with the ship speed picked up by the gap 25. This secondary flux pickup alternately and destructively interferes with the primary signal flux in the gap 25, which in turn causes an attenuation wave called "head bump". The first bump occurs at a wavelength corresponding to the length of the core in contact with the tape. Thus, by extending the length of the pole ends 30, 30 'beyond the laminated core section 24, 24', the wavelength at which the first bump occurs is increased and thereby the frequency is lowered. In addition, the high frequency efficiency of the edge read will be reduced, which will reduce the peak amplitude of the edge read pulse.

The size of the magnetic core is extremely small, which results in short magnetic length, which is essentially the distance around the inner conductor. By having extremely short magnetic paths, the core magnetoresistance is less dependent on core permeability, resulting in a significant gain in flux efficiency in the 100 to 150 MHz frequency range. Permeability in this frequency range can be substantially reduced by eddy current losses and other frequency effects that are minimized by fabricating core sections from thin monolayers.

In addition, because of the small transducer size, the whole core will contact the magnetic tape moving over the pole end. The wear resistance of the pole ends will be improved as they are solid magnetic materials rather than laminated. The stacked headcore sections are not exposed to the magnetic video tape. In addition, leakage inductance is reduced because it integrates close to the head core section where the inner and outer conductors are stacked.

The entire transducer 20 is manufactured by low cost techniques such as mass production, extremely high accuracy, and material attachment and light weapon methods. By batch manufacturing, all the magnetic core materials for many transducers 20 are attached during the same process step and all the conversion gaps are formed simultaneously. This results in a high degree of uniformity for all transducers 10.

It is contemplated that a wide variety of modifications and improvements to the stacked high frequency magnetoelectric transducers described herein and methods of making them will be apparent to those skilled in the art. Accordingly, no limitations are intended to the invention by the description herein, except as described above in the appended claims.

Claims (42)

Magnetic transducers for reproducing and / or recording high frequency signals with a magnetic medium, consisting of: a plurality of thin alternating layers of magnetic material and insulating material, opposed to each other, separated and coupled to each other by an insulating gap; A pair of opposing magnetic core sections arranged such that the pair of magnetic core sections are generally Y-shaped; A pair of outer insulation layers disposed on outer surfaces of said generally pair of Y-shaped opposing magnetic core sections; A pair of outer conductors disposed on the outer pair of insulating layers; A pair of inner conductors disposed within the open ends of the generally pair of opposite Y-shaped magnetic core sections, one of which is disposed on one side of the insulating gap; And operatively disposed at the V-shaped top end of the opposing magnetic core section pair and separated by the insulator so that one of the magnetic poles is disposed on one of the pairs of magnetic core sections and the other of the magnetic poles is the magnetic core section. A pair of solid magnetic material poles arranged to be placed on top of one another. The magneto-electric converter according to claim 1, further comprising means for electrically connecting the inner and outer conductors of the magnetic core section pair to form a signal coil. 3. The magnetor converter of claim 2, further comprising preamplifier means physically coupled to the converter and electrically connected to the signal coil. A magnetic transducer for reproducing and / or recording a high frequency signal with a magnetic tape medium, each magnetic core element comprising: a. Multiple alternating layers of magnetic and insulating materials; b, an outer insulating layer disposed on an outer surface of the core element; c. An outer conductor disposed on the outer insulation layer; d. An inner conductor disposed on an inner surface of the core element and including a segment in an arm portion extending outward of half of a Y-shape; e. A solid magnetic material magnetic pole stage operatively disposed over the segment at a far end of the core element arm portion; And f. A first magnetic core element and a second magnetic core element which, when opposed to the front, form a generally Y-shaped arrangement together with a support for supporting the core element including the outer conductor and the pole end portion; An insulating gap layer disposed between the first and second magnetic core elements; Coupling means for holding the first and second magnetic core elements in the Y-shaped arrangement around the insulating gap layer; And means for electrically interconnecting the inner and outer conductors of the first and second magnetic core elements to form a signal coil. 5. The magnetor converter of claim 4, further comprising preamplifier means physically connected to the magnetic core element and electrically connected to the signal coil. A magnetizer for reproducing and / or recording high frequency signals with a magnetic tape medium, which is configured as follows; Each magnetic core element is a. A core array forming a surface comprising a first generally planar surface and a second generally planar surface obliquely adjacent to the first surface and additionally adjacent pole end surfaces adjacent to the second surface. A support comprising a support and forming a plane generally parallel to the first surface; b. A first conductor layer on the core array forming a surface; c. A first insulating layer on the first conductor layer; d. A plurality of thin alternating layers of magnetic material and insulating material, said core section, said first insulating layer and said first conductor layer being disposed over said first insulating layer having a cross section matching said core arrangement forming a surface; Laminated core section; e. A second conductor layer having a segment on the laminated core section at a portion corresponding to the second surface; And f. A solid magnetic material pole end formed at least partially on the pole end surface in a magnetic relationship with the top of the core section and overlying the segment of the first insulating layer, the first conductor layer and the second conductor layer; First and second magnetic core elements configured to, when opposed to the front, generally form together a Y-shaped arrangement; An insulating gap layer disposed between the first and second magnetic core elements; Coupling means for holding the first and second magnetic core elements in the Y-shaped arrangement around the insulating gap layer; And means for electrically connecting the first and second conductor layers of the first and second magnetic core elements to form a signal coil. 7. The magnetor converter of claim 6, further comprising preamplifier means physically coupled during the conversion and operably connected to the signal coil. The magnetic material of the magnetic pole stage is the same as the magnetic material of the laminated core section, and the magnetic material is selected from the group consisting of cobalt-zirconium-niobium alloy, iron-aluminum-silicon alloy and amorphous metal. Magnet converter. 7. The magneto-electric converter according to claim 6, wherein said insulating material is selected from the group consisting of alumina, silicon dioxide and ceramics. 7. The magneto-transducer of claim 6, wherein the conductor layer is copper. 7. The magnetic transducer of claim 6, wherein the thin layer thickness of the magnetic material is about 40 micro inches and the thin layer thickness of the insulating material is about 1 to 2 micro inches. 12. The magneto-transducer of claim 11, wherein the stacked core section has a length of about 0.005 inches. 13. The magneto-transducer of claim 12, wherein the height of the pole ends is about 0.0005 inches. 14. The magneto-transducer of claim 13, wherein a depth of pole end and stacked core sections is about 0.001 inches. 7. The magneto-transducer of claim 6, wherein the length of the V-shaped top portions of the Y-type first and second magnetic core elements is about 10% of the total length of the Y-type first and second magnetic core elements. Magnetic transducers for reproducing and / or recording high frequency signals with a magnetic medium consisting of: a pair of opposing transducer heads, separated by an insulating gap layer, joined together by a half of each transducer head, comprising: a generally flat plate Shaped first conductor layer; The surface is tightly fixed to the first conductor layer and is formed of a thin insulating layer on the alternating thin layer of magnetic material and insulating material after the first conductor layer, and the composite material of the first conductor layer and the laminated core section A laminated core section of a predetermined butterfly having an arrangement such that when the parts are opposed to each other, the two parts generally have a Y-shaped cross section; A surface attached with a portion of the first conductor layer adjacent to the core section edge and an insulating layer overlying the edge of the laminated core section: another transducer placed in a relationship adjacent to the opposite side of the insulation gap layer in the V-shaped portion of the Y-shaped cross section. A second conductor layer on the insulating layer formed as a U-shaped member generally inverted by the curved portion, with half the similar curved portion; And a block-type magnetic pole end extending in the V-shaped portion in a direction perpendicular to the far end of the laminated core portion arm and in close proximity to the curved portion and extending generally in a direction perpendicular to the plane of the insulating gap layer. 17. The method of claim 16, wherein the inner and outer conductors are both larger than the butterfly of the laminated core section so that after joining the two halves together, the edges of the first and second conductor layers are accessible and the transducer is a signal coil. And means for electrically interconnecting the edges of the two halves of the first and second conductor layers to form an interconnect. 17. The magnetic transducer of claim 16, wherein the two adjacent curved portions of the second conductor layer and the intervening portions of the insulating gap layer substantially fill the V-shaped portions. A method of manufacturing a magnetic transducer for reproducing and / or recording a high frequency signal with a magnetic medium, comprising: forming at least two magnetic core sections each having a half of a Y-type, each core section being A plurality of thin alternating layers of magnetic and insulating material, the outer insulating layer being disposed on the outer surface of the core element, the outer conductor being disposed on the outer insulating layer, and the inner conductor being extended to the outside of the Y-shaped half. Disposed on the inner surface of the core element at the top of the solid magnetic material pole end is operatively disposed on the top of the core section above the Y-shaped half, and the support includes the outer conductor and the outer surface of the pole end. Supporting the core element; Forming a gap insulation layer on the inner surface of each half of the Y-type magnetic core element; Coupling the magnetic core elements together in the gap insulation layer to form a generally Y-type transducer; And electrically connecting the outer and inner conductors of each of the magnetic core elements coupled together to form a signal coil. 20. The magnetic core element of claim 19, wherein a preamplifier means is electrically connected to an outer conductor of one of the magnetic core elements and an inner conductor of the other of the magnetic core elements, and the inner conductor of the one of the magnetic core elements connected to the magnetic core element. And electrically connecting to the other outer conductor of the magnetic converter. 20. The method of claim 19, wherein the magnetic material is selected from the group consisting of cobalt-zirconium-niobium alloys, iron-aluminum-silicon alloys, and amorphous metals. 21. The method of claim 20, wherein the insulating material is selected from the group consisting of alumina, silicon dioxide, and ceramics. 21. The method of claim 20, wherein the conductor is copper. 21. The method of claim 20, wherein the thin layer thickness of the magnetic material is about 40 microinches and the thin layer thickness of the insulating material is about 1 to 2 microinches. 25. The method of claim 24, wherein the laminated core section has a length of about 0.005 inches. 27. The method of claim 25, wherein the height of the pole ends is about 0.0005 inches. 27. The method of claim 26, wherein the depth of pole end and laminated core section is about 0.001 inches. 27. The method of claim 25, wherein the length of the V-shaped top portion of the Y-type magnetic core element is about 10% of the total length of the Y-type magnetic core element. A method of manufacturing a magnetic transducer for reproducing and / or recording a high frequency signal with a magnetic tape medium, comprising: a flat surface adjacent to and intersecting a tapered surface by shaping a flat surface of a nonmagnetic, nonconductive support, and the tapering Forming a plurality of spaced pole end notches in a planar band adjacent the surface; Filling the plurality of spaced stimulus stage notches above with a photoresist plane that is flush with the plane of the band; Attaching a highly conductive, nonmagnetic metal layer to the planar surface and the tapered top surface; Attaching an insulating material layer on the layer to which the highly conductive, nonmagnetic metal layer is attached; Alternately attaching a plurality of thin layers of magnetic material and insulating material on the attached insulating material layer to form a laminated structure; Selectively removing a portion of the laminated structure above the highly conductive, non-magnetic metal layer in the region between the spaced pole end notches so that a plurality of generally in line with and below each of the plurality of pole end notches Forming parallel and equally spaced stacked magnetic core sections; Attaching an insulating layer having a generally uniform thickness to the exposed portion of the highly conductive, nonmagnetic metal layer and the exposed surface and the open portion of the laminated magnetic core section; Attaching a highly conductive, non-magnetic metal layer on the attached insulating layer to a level generally parallel to the planar surface of the support and generally in the same space as the insulating surface plane of the laminated magnetic core section; The material thus attached is selectively removed from the band section to expose the exposed top edges of both the interlayer insulating layer, which is the highly conductive, non-magnetic metal layer, and the laminate core section having the plane generally perpendicular to the plane of the band. Forming a plane defined by; Removing the photoresist from the plurality of pole end notches on the tapered top surface of the corner; Selectively attaching a magnetic material in the magnetic pole notch and on the magnetic core section to form a plurality of block-shaped solid magnetic poles, each of which has a magnetic relationship with one of the laminated magnetic core sections; Attaching a gap insulation layer on a surface of the magnetic core section, a surface of the magnetic pole end, and a plane on the attached high conductive, nonmagnetic metal layer; Joining opposing stacked magnetic core sections together in a gap insulating layer to form a plurality of generally Y-type transducers; And slicing individual Y-type transducers from the combined structure. 30. The method of claim 29, wherein said shaping step is reactive ion beam corrosion. 30. The method of claim 29, wherein said attaching step is sputtering. 30. The method of claim 29, wherein the attaching step is vacuum attachment. 30. The method of claim 29, wherein the attaching step is ion plating. A method of manufacturing a magnetic transducer for reproducing and / or recording a high frequency signal with a magnetic tape medium comprising the following steps: A second tapered by molding a nonmagnetic, nonconductive support having first and second surfaces perpendicular to each other. Forming a third planar band adjacent to and intersecting a surface to a first surface and generally parallel to the first surface and adjacent to the second tapered surface; Attaching a highly conductive, nonmagnetic metal layer to the first and second surfaces; Attaching an insulating material layer on the layer of the highly conductive, non-magnetic metal layer thus attached; Alternately attaching a plurality of thin layers of magnetic material and insulating material on the attached insulating material layer to form a laminated structure; Selectively removing a portion of the laminate structure on top of the highly conductive, non-magnetic metal layer so that a plurality of generally parallel and equally spaced oriented perpendicular to the second surface in the region below the third band surface Forming a laminated magnetic core section that is generally identically arranged; Attaching an insulating layer of generally uniform thickness over the exposed portions and edges of the highly conductive nonmagnetic metal layer and the stacked magnetic core sections; The highly conductive, non-magnetic metal layer on the thus-attached insulating layer is generally the same surface as the second surface and is generally the same as the plane of the insulating surface of the magnetic core section, which is generally parallel and laminated to the first surface of the support. Attaching at a level across; The laminated magnetic core having the top exposed edges of both the highly conductive, nonmagnetic metal layer, the intervening insulating layer and the plane generally perpendicular to the plane of the band by selectively removing material so attached in the zone of the band. Forming a plane defined by a section; Attaching a magnetic material on each of the magnetic core sections to form a plurality of solid magnetic poles in relation to the depth of the band and the far end of the laminated magnetic core section; Attaching a planar gap insulation layer over the surface of the magnetic core section, the surface of the magnetic pole end, and the attached highly conductive, non-magnetic metal layer; Forming a plurality of generally Y-type transducers by joining together the processed supports in such a way that the gap insulating layers face each other in alignment with the opposing stacked magnetic core sections; And slicing individual Y-type transducers from the combined structure. 35. The method of claim 34, wherein the magnetic material is selected from the group consisting of cobalt-zirconium-niobium alloys, iron-aluminum-silicon alloys, and amorphous metals. 35. The method of claim 34, wherein the insulating material is selected from the group consisting of alumina, silicon dioxide, and ceramics. 35. The method of claim 34, wherein the highly conductive, nonmagnetic metal layer is copper. 35. The method of claim 34, wherein in the laminate structure, the thickness of the thin layer of magnetic material is about 40 micro inches and the thickness of the thin layer of insulating material is about 1 to 2 micro inches. The method of claim 38, wherein the laminated core section has a length of about 0.005 inches. 40. The method of claim 39, wherein the height of the pole ends is about 0.0005 inches. 41. The method of claim 40, wherein the depth of the pole end and the laminated core section is about 0.001 inches. 42. The method of claim 41 wherein the length of the V-shaped top portion of the Y-type magnetic core element is about 10% of the total length of the Y-type magnetic core element.