NL8020408A - - Google Patents

Description

”......................................; ........ .. ....................... .............. 8 ö 2 0 4 0 8 VO 1988

Title: Suspension device with_bending along the_Z axis,

This invention generally relates to magnetic recording devices and more particularly to an improved support structure for electromagnetic transducers of a kind which is particularly useful in a magnetic disk data storage system for transferring data between the transducer and a flexible magnetic disk.

All magnetic data storage systems require a magnetic data recording medium for storing magnetic data and an electromagnetic transducer equipped with one or more "heads" for performing "reading" and / or "writing". data in magnetic form from or on the recording medium, respectively. Although such magnetic data storage systems have used data recording media of various embodiments (such as ribbons, rigid disks and drums), the so-called "floppy disk" medium has recently found wide application in not only program storage and input applications, but also in a number of different data entry, storage and control applications. The "floppy disk" medium is a thin, generally flat, flexible or pliable magnetic disk, provided with magnetically sensitive surfaces and. currently rotatable at speeds of about 360 revolutions per minute in a protective casing or jacket casing. Data transfer to and from the "floppy disk" is accomplished through one or more electromagnetic heads mounted in and jointly forming a transducer. The transducer (or transducers) communicate with one or both surfaces of the "floppy disk" through window openings in the protective casing.

A number of different transducer constructions useful for connection to "floppy disks" have appeared in the art. In general, the portions of these transducers which are responsible for the electromagnetic transfer of data to and from the "floppy disk" in their constituent bases do not differ greatly from each other. in principle, a plurality of magnetic core members, pre-arranged with respect to each other, secured together and connected to one or more coils for determining an active electromagnetic transducer. For the most part, these transducer constructions, as used in connection with data transfer to and from a "floppy disk" 8020408-2, comprise a single channel read / write head, and usually may also include a erase head ". The erase head generally includes a number of erase cores for trimming an information "track" written on the surface of the "floppy disk", and for erasing a pair of protection band areas on either side of the trimmed track. For the purposes of this invention, the particular constructional details and the spacing of the electromagnetic components, which together make up the different head portions of an electromagnetic transducer, are not important per se, since the present invention is equally valid for any electro-magnetically active "type" of such transducer and its component head constructions, whether they be multiple or single, erase, read, write, or composite read / write heads.

The present invention applies equally well to both "single-sided" and "double-sided" "floppy disk" data transfer systems. In a single system, electromagnetic data transfer between the transducer and the "floppy disk" is only possible on one side of the "floppy disk" at a time. Efficiency is significantly improved with a double-sided system. In such a system, data transfer 20 on either side of the "floppy disk" is possible at the same time. This has been made possible by the use of a pair of generally opposite transducers operatively disposed to enclose the "floppy disk" therebetween, thus engaging both surfaces of the "floppy disk" simultaneously.

Prior art "Floppy disk" systems, both single and double sided, usually have their respective transducer "assemblies" mounted to a movable carriage structure, which is radially displaced with respect to a "floppy disk". a fixed position under the circumstances. Movement of the carriage structure allows the transducer or transducers carried thereby to access different, desired circumferential "tracks" on the magnetizable surface or surfaces of the "floppy disk".

To facilitate description and reference throughout the application, it will be useful to define various terms used herein. The term "customer comparison plane" (abbreviated as CKP] is defined as a plane passing through predetermined portions of the movable carriage construction of a "floppy disk" - 8020408-3 system Manufacturers of the movable carriage construction usually specify the CRP in proportion to certain portions of their particular carriage construction, and specify the parameters of construction and operation in relation to the transducer and "floppy disk" movement with reference to the defined CRP For the purpose of further discussion herein, the term "nominal disk face" defined as the face, "in which a surface of a" floppy disk "is nominally, during disk rotation, because a" floppy disk "has two data transfer surfaces, which are separated by the thickness of the 10 "floppy disk", it will have two nominal disk faces, generally referred to as "top" and "bottom" nominal disk faces n. In a single-sided "floppy disk" system, only a nominal disk plane will be important for data transfer operations, because data is only transferred to one side of the disk at a time.

1-5 In a system with a double-sided "floppy disk", where data transfer is possible on both sides of the disk at the same time, both the top and the bottom nominal disk area are important. Typically, the nominal disc plane is in a plane parallel to the CRP. In an optimally operating system, it is desirable that the two data transfer surfaces of the "floppy disk" except for the portion engaged by the transducer or transducers be perfectly flat in the upper and lower nominal disc surfaces, respectively, without imperfections therein such as swinging or deformation, for example caused by imperfections, in the disc itself, by the flexible nature of the disc or by movement transferred to the disc by the device rotating the disc.

Known "floppy disk" data transmission systems have differed in their designs from the transducer support structure mounted to the movable carriage. In earlier single-sided "floppy disk" -30 systems, the transducer generally had a curved surface for operative engagement of the "floppy disk" and for penetration into and beyond the nominal disk surface of the engaged data transfer surface. The transducer was generally rigidly mounted to the movable carriage. A pivotable arm, which carried a pressure pad, was pivotally mounted to the carriage to allow insertion of the disc. The arm was under spring load so that the pressure pad carried thereby engaged with the disc in one position directly opposite the trans-4 transducer head and exerted a known force on the disc, causing the pliable disc to engage intimately. was adapted to the curved transducer head This former single-sided system provided limited power in data transfer because only 5 data transfers could be achieved on one side of the disc at a time, and thus was relatively slow.

Requirements of greater power and faster data accessibility and transfer have resulted in two-way data transfer systems with a "floppy disk", providing the ability to simultaneously transfer data on either side of the "floppy disk".

As stated above, such systems generally have a pair of transducers mounted for operatively engaging each other. lying surfaces (or sides) of the "floppy disk", generally in an opposed relationship. The opposing transducers are generally positioned so that their respective head "slits" are offset slightly radially to minimize magnetic flux inter-transducing between the transducers.

In these known double-sided data transfer systems with a "floppy disk", the upper and lower recording surface areas of the "floppy disk" can be intermittently disengaged. move the respective upper and lower nominal disc surfaces. These anomalies could, for example, be caused by disrupted disks or excessive disk sway (i.e. disruptions in the disk surfaces when the disk is spinning). It is therefore considered desirable that the opposed transducer heads be mounted movably relative to each other so that the transducer heads could follow the actual path of the "floppy disk" recording surfaces passing therebetween. would deviate from the top and bottom nominal disc faces. Accordingly, various transducer assemblers have been designed in the art to adapt to such deviations in the operating motion of a "floppy disk".

One such mounting embodiment, disclosed in U.S. Pat. No. 29,380, Reissue, issued August 30, 1977, illustrates a method of mounting a pair of transducer sliding heads in opposite relationship to a pair of 8020408-5.

rigid wishbones, "movable to and from each other by solenoid action for disc loading operations. The wishbones engage carriage strikes to limit the closing distance therebetween to a fixed predetermined value. The opposed transducer heads 5 are pressed into vigorous engagement with the disk by a pair of coil springs, which springs lie below the transducer heads for enclosing the "floppy disk" therebetween Such construction generally does not provide the sensitivity in motion required for the transducer heads to follow deviations from the "Floppy disk" from the nominal disk surfaces during a persistent state. It is believed that such a construction is also prone to input data transfer errors caused by "shifting" the transducer head surfaces relative to the recording tracks of the disk when the transducer heads !, tilt "15 for adaptation: to perturbations in disc movement · from the nominal disc planes. The construction precludes a slow loss engagement following a loading operation (i.e., the engagement of the opposing transducers on the rotating disk). With this construction, the intimate contact between the transducer heads 20 and the recording surfaces of the "floppy disk" is reduced.

Another variation of a dual transducer mount embodiment, intended to improve the transducer motion response time during a steady state and to increase the intimate contact between the transducers and the recording surfaces of the "floppy disk" is disclosed in U.S. Patent No. 089,029, issued May 9, 1978. In this construction, a pair of transducers, mounted on long, cantilever supporting arms, are mechanically pressed together under spring pressure, whereby each of the opposing transducers, which is thereby mounted, independently mounted on a compass bracket construction, which allows universal Grail movement of the respective transducer head assemblies. The disc engaging surfaces of the transducer heads are generally planar. The rotatable transducer support arms are interlocked such that movement of one of these arms, tending to raise one of the transducers from engagement with the surface of the disc, also moves the second arm to thereby move the second transducer from the opposite 8020408-6 surface of the disc for loading and unloading the disc in and out of the operative position. Each arm is pressed against its associated side of the disk with a predetermined force, tending to maintain intimate maintenance between the transducer carried by that arm and its respective engaged disk surface. The composite construction encloses the "floppy disk" between the opposing transducers with a relatively weak loading force of 6-7 grams, which tends to give rise to instability. While the dual compass bracket construction is designed to allow rapid response movement of the transducer heads to adapt to disk movement perturbations from the nominal disk surfaces, such transducer tracking motion also gives rise to sliding or distancing. sliding errors. When the transducer head moves on the universal compass bracket structure to track a disc surface that has left the nominal disc surface, the respective surfaces of the transducer head and its associated disc track * are "shifted" relative to each other such that the read / write gap of the transducer head can be misplaced with respect to the displaced recording track on the disk surface, thus reducing or disadvantageous data transmission with the track. The direction of such a shift depends on the direction of the disruptive movement of the disc. Such a shift may be tangent to the recording track, giving rise to misplacing of the read / write gap with respect to the bit position of data in the recording track, further in a radial direction with respect to the recording track giving radial misplacement of the read / write gap with respect to the physical location of the recording track on the disc surface or in the direction of some composite angle therebetween. Transducer / registration trace misplacement errors are also introduced by the universal movement of the dual compass bracket structure by a torsional or rotational movement of the transducer heads about an axis perpendicular to the nominal disc plane and by a friction-induced side shift. the trans-35 dueter head surfaces. in the nominal disc plane itself. Such lateral displacement and rotational misalignments of the aforementioned kind will be described in more detail later in this application. 8 0 2 0 4 0 ® - 7 - with respect to a given coordinate equation system having X, Y and Z axes. Such offset and offset errors cause a misplacement of the bit position on the disc radially and circumferentially during write operations, and reduce amplitude in read operations due to azimuth errors. (compound angle) and reduction in perceived recording track width. A time setting error of the read bits is also incurred. This type of system is also very complicated and expensive to construct and manufacture.

A relatively recent embodiment of a two-sided data transfer system with a "floppy disk" is disclosed in US Patent U.15'1.573, issued April 2, 1979. This construction is designed to improve the intimate contact between the transducer disc surfaces and to mitigate some of the drawbacks of the well-known two-sided kampas bracket transducer support structure. This construction utilizes an asymmetric transducer support structure, comprising a first or bottom transducer with a flat transducer core surface, which is rigidly mounted (as in previous single-sided data transfer systems). A second (top) transducer is mounted on a universally movable compass bracket construction and is pivotally movable by a spring-loaded arm, but in operative proximity to the fixed lower transducer head for thus enclosing the predetermined force therebetween. floppy disk. The lower transducer head construction is proportionally larger (in surface area) than the upper transducer head to extend considerably beyond the circumferential dimensions of the upper core transducer. The core surface of the bottom transducer is mounted to thereby penetrate excessively into the nominal disk face of a loaded "floppy disk", and the top transducer supported by the compass bracket supported structure acts as a pressure pad for the bottom, fixed transducer head. Conversely, the lower fixed transducer head acts as a pressure pad for the upper transducer core. While this construction reduces some of the offset and offset tracking errors inherent in the two-sided compass bracket construction, it does experience some misplacement of the transducer relative to the bottom flange disk registration track due to the * 020408. - 8 - fixed nature of the lower transducer head. More importantly, however, due to the "hard" landing of the top transducer head on the fixed bottom transducer head during the "loading" of a system (ie, engagement of the transducer heads on the opposite recording surfaces of the " floppy disk "), wear on the" floppy disk "is excessive, as is the case with the dual compass bracket construction.

The present invention overcomes most of the aforementioned shortcomings of the prior art transducer support structures and is suitable for use in both single and double sided data transfer in "floppy disk" systems. The present invention provides a transducer support structure that minimizes physical wear on the "floppy disk", especially during "loading" of a system.

The present invention improves the intimate contact between the transducer or transducers and both disk surfaces during a persistent state, thus improving data transfer and reducing bit losses due to a. improved touch sensitivity, especially when the data transfer is performed at higher transfer frequencies.

The present invention achieves these improved results primarily through the use of a transducer support structure, which construction permits limited freedom of movement of said transducer head in a direction perpendicular to the CRP while maintaining the surface of the transducer head substantially parallel to the transducer head. 25 dig to the CRP. This construction provides a significantly improved damping effect during a loading operation, decreases the brewing time to equilibrium, and provides good intimate contact between the transducer and the disk (and between both transducers and the disk in two-sided systems), allowing for precise transfer. data even before a "physical" equilibrium after loading is reached.

The construction of this invention minimizes tracking errors due to side transducer / disc shifts when the transducer follows a disc surface that deviates from its nominal disc plane. The construction of this invention also prevents tracking errors caused by frictional lateral shifts of the transducer head surface in the nominal disc plane. The construction of this invention further prevents tracking errors due to a rotational movement of 8020408 ~ 9 - the transducer head surface in the nominal disc plane and about an axis perpendicular to the CRP.

The present invention includes a special support structure for a magnetic transducer head assembly, particularly 5 is suitable for use in data transfer systems of the kind using non-rigid, planar, rotating magnetic recording media, such as, although not necessarily limited to, the "floppy disk" magnetic recording media. The invention applies not only to the supporting structure itself with Z-axis bending, but also to its effective application in connection with a second transducer or pressure cushion arranged and supported opposite it in double-sided and single-sided magnetic data transmission systems, respectively. The coupling also applies to a special head assembly for magnetic recording constructions, provided with sliding parts carried opposite each other, wherein both sliding parts are mounted for independent movement, but in such a way that the sliding parts have a difference in movement with respect to each other.

A magnetic transducer head assembly in which this invention has been accomplished includes a transducer having a data transfer surface suitable for sliding engagement of the surface of a flat, rotating, non-rigid magnetic recording medium, and a transducer support structure, which the transducer supports for movement in a special way. The transducer support structure is designed to support the transducer for resilient movement in a Z axis arrangement, substantially preventing movement of the general plane of the data transfer index of the supported transducer in all other directions. The transducer support structure therefore substantially prevents movement of the transducer, which would give an adverse, lateral "shift" movement to the data transfer surface, which would give rise to data transfer errors. Such lateral "yer shear" errors include both the transducer end face shifts, which shifts represent a component in the nominal XY plane of the displacement due to the transducer core rotational movement about the X or Y axis coordinates (described in more detail below). ) as well as the friction-induced side shifts resulting from a shear frictional engagement between the recording medium surface and the data transfer surface of the transducer. The transducer support structure allows for a very limited degree of rotational movement of the supported transducer data transfer surface about the X and Y axis coordinates to enable the data transfer end face of the transducer to "follow" perturbations in the active sustained state movement of the recording medium, which permissible rotational movements are, however, so limited that they do not give rise to shift errors in data transfer. The transducer support structure also substantially prevents shifts or movements of the data transfer surface of the supported transducer in the X-Y plane caused by a rotary sweep of the transducer about a Z axis coordinate.

The effective result of the transducer support structure is that the general plane of the data transfer surface of the transducer moves in a plane perpendicular to the Z axis direction without any data transfer causing lateral or rotary shift of the data transfer surface, even in its general plane . The Z axis is determined in the transducer supporting structure determination as an axis which is perpendicular to the general plane of the data transfer surface of the transducer carried thereby when the transducer is mounted to the supporting structure without any external forces are applied to the transducer.

The transducer support structure of the present invention preferably includes a housing suitable for engagement with a support surface, such as a movable carriage of a data transfer system having a "floppy disk", and a flex support means mounted on the housing for supporting the support. transducer in the manner previously described for resilient movement in substantially only the Z axis direction.

In a preferred embodiment of the transducer support structure, the tube support comprises a transducer mounting part, to which the transducer is rigidly mounted, and a resilient bending means, which extends from the transducer mounting part and is secured to the housing for resiliently carrying the transducer mounting part for movement in mainly only the Z axis direction. It will be appreciated that the shape of the data transfer surface of the supported transducer could be flat, spherical or in any other suitable shape, and that the present invention applies equally to all such shapes.

8020408 ', * *, n w

Eat "bouncy bum." can . have an arbitrary onion arrangement which operates in conjunction with the transducer mounting member to provide the desired bearing function in the Z axis direction. In the preferred embodiment, this bending means comprises a plurality of blade-shaped bending shaft sections extending between the periphery of the transducer mounting section and the housing, thereby suspending the transducer mounting section through and between the bending shaft sections. In the preferred support structure, the bending axis portions suspend the transducer mounting portion and the transducer mounted thereto in the center portion of the housing so that the transducer gene transfer surface extends in the Z axis orientation slightly above the general plane of the top portion from the house·.

If the bending support means includes a plurality of bend axis portions, it may have any number of such bend axis portions, the portions of which may be of any shape and shape to accomplish the desired Z axis bearing motion for the transducer. Bend axis parts are cooperatively formed with a spring force sufficient to stably support the transducer during both temporary loading operations and permanent state operations, as determined by the particular data transfer system in which the transducer support structure is to be incorporated. A relatively stiff bending spring force is preferred for reducing the physical set time to equilibrium while providing effective shock absorption properties for impact forces applied to the transducer during temporary loading operations. The bending spring force is designed to balance the desired stiffness for temporary loading operations, some Z-axis resilience to absorb Z-axis forces applied to the transducer by disturbances in the movement of the engaged data transfer medium for sustained state operation and adaptation to a minimally limited rotational deviation about the X and Y axis coordinates, so that the data transfer end face of a supported transducer tends to respond to disturbances in the movement of an engaged rotating recording medium from its nominal rotational plane. In the preferred bending structure, the bending axis parts have width dimensions that are considerably greater than their thickness dimensions, and are arcuately bent in the direction of movement from the transducer mounting part to the ends of the bending 8020408. 12 - Shaft Parts Secured to the Body. In the preferred construction, the arcuate bend shaft parts suspend the transducer mounting section in a plane spaced in the Z axis direction from the general plane of the ends of the bend shaft sections secured to the housing.

In a preferred embodiment of the resilient bending means, the number of bending axis parts extends outwardly from the transducer. mounting part in a cantilevered manner., and are 'their. outwardly projecting ends secured in a relatively rigid circumferential support frame. The circumferential support frame is secured to the housing by appropriate means, such as by insert molding techniques or by the. bind directly to seat areas, pre-formed in the housing material.

When used in conjunction with a data transfer system, the transducer support structure of this invention can be used for. . carrying the first or second slider portion, said portions engaging operatively opposed surfaces of a non-rigid, flat, rotating magnetic recording medium. One of these sliders includes a magnetic transducer, which can transfer data through its data transfer surface to the associated recording surface. of the recording medium. Generally stated, the invention, as applied to a head assembly for magnetic recording constructions of the type using a non-rigid, flat, rotating magnetic recording medium, comprises (a) first and second sliders, each having at least one surface suitable for sliding engagement of the planar recording surfaces. from the rotating non-rigid magnetic recording medium, at least one of the sliding members comprising a magnetic transducer capable of transmitting data through its intended one surface, to the associated recording surface of the recording medium, 30 (b) means for mounting of each of the first and second sliding parts for independent movement in such a way that the intended one surfaces of the first and second sliding parts have a mutual difference of movement, (e) positioning means for carrying the mounting means and the sliding parts on a generally opposed so that the said one surfaces of the slide members operatively engage the opposing recording surfaces of the recording medium 8020408-13, and (d) means operatively associated with the locating means for fixed predetermined force pressing the sliding parts together, so that the The running recording medium is effectively enclosed. 5 between the intended one surfaces of the opposing sliding parts.

In a preferred embodiment of the described transducer support structure, the mounting means comprises a first mounting structure, which operatively carries the first slide part in a manner which substantially inhibits the intended one surface of the first slide part from movement in directions, except in a Z axis direction perpendicular to the nominal plane of the engaged recording medium surface. The first mounting construction does allow a minimal limited rotation of the first sliding part around the 15 X and Y axis coordinates. The first mounting structure resiliently permits such movement in the Z-axis direction, so that the general plane of the intended one surface of the first sliding member remains substantially parallel to the general plane of the recording medium surface during movement of the intended one surface in the Z-axis direction.

The mutual difference in motion between the surfaces of the first and second sliders, in engagement with the magnetic recording medium, reduces wear on the gripped surfaces of the recording medium, especially during temporary loading operations, by reducing the effects of the otherwise "hard" impact engagement of the first and second sliding heads with the recording medium surface during a loading operation. The mutual difference of movement agreement is achieved in a preferred construction by using the above-described Z-axis bending support assembly 30 for one of the opposing sliding members, and by using a compass bracket mounting structure for the second sliding member, the compass bracket mounting structure allowing universal movement of the engaging surface of the second sliding member about a fixed pivot, but movement of that one surface in the Z-axis direction at the fixed pivot prevents. In a preferred embodiment of the dual sliding part data transmission system, the positioning means comprise at least one rotatably movable carrying arm for moving at least one 8020408-1U.

of the first and second sliders, with respect to the other slider, so that the two "sliders" move together toward and from opposite enclosing engagement with the recording medium for loading and unloading operations, respectively. As applied to the invention comprises: a two-sided data transmission system, comprising a head assembly for operatively handling a pair of magnetic transducers with heath surfaces of a non-rigid, flat, rotating magnetic recording medium, a first transducer, provided with a generally planar data transfer end face and suitable for transferring data in magnetic form to a first side of a non-rigid, flat magnetic recording medium, (h) first mounting means for mounting the first transducer 15 in a data transfer mode relative to the first side of the recording medium in such a way that movement of the first The transducer relative to the mounting means substantially in all directions, except the Z axis direction perpendicular to the general plane of the medium is prevented, regardless of movement of the transducer and the mounting means to other positions along the general plane of the medium, (c) a second transducer, provided with a data transfer end face and suitable for transferring data in magnetic form to a second side of the magnetic recording medium, (d) second mounting means for mounting the second transducer 25 in a data transfer mode relative to the second side of the recording medium such that the data transfer end face of the second transducer is relatively free to move in a compass bracket fashion about a pivot fixed with respect to the second mounting means but with movement of the end 30 flat is prevented in the Z-axis direction at the pivot point, (e) supporting means operatively carrying the first and second mounting means in a generally opposite manner to the recording medium, such that the transfer end faces of the first and second transducers slidingly engage the first and second recording surfaces of the recording medium in opposite manner enclosed therebetween, (f) pressure means operatively connected to the support means for pressing the data transfer surfaces of the first and second transducers together with a fixed predetermined force, which force is sufficient maintaining an effective sliding engagement between the data transfer end faces and the opposing surfaces of the recording medium despite deviations during the rotational movement of the first and second recording surfaces from their nominal faces.

In such a double-sided data transfer system application, the first transducer mounting means includes means for 10 'resiliently carrying the first transducer for movement in the Z axis direction and for permitting minimally limited rotational movement of the first transducer around X and Y transducers. ascoordinates to allow the data transmission surface of the first transducer to track disturbances in the movement of the magnetic recording medium surface from its nominal effective plane. In such a construction, the I-r and Y axis coordinates are placed at right angles to a Z axis coordinate, passing through the geometric center of the data transfer surface of the first transducer. It will be understood that the principles of this invention apply to the carrying of transducers of any shape from smooth, sliding data transfer surfaces, regardless of whether these surfaces are planar, spherical or of any other shape.

While the present invention will be described with respect to a preferred embodiment thereof, which illustrates preferred constructions and embodiments of various portions thereof, it will be appreciated that many variations of the basic concepts and rules disclosed in the preferred embodiment have the scope and the broad scope of this invention can be practiced. While the preferred embodiment of the invention will be disclosed with respect to its applicable use with a "floppy disk" double-sided data transmission system, it will be particularly apparent that the invention applies equally well to other embodiments of magnetic magnetic data transmission systems. transducers. Although the invention will be described with respect to a particular outer liner 35 'of a bending support structure, it will be clear that a number of other embodiments of this bending assembly can also be carried out within the scope of this invention. These variations, additional variations, which are described throughout the application 8020408-16, and other variations which can be made by those skilled in the art are all encompassed within the broad scope of this invention, as limited only by the scope of the accompanying conclusions.

5 Short 'description of the' drawing.

Referring to the drawing, in which like reference numerals represent like parts throughout the views, Fig. 1 is a spatial view, partially broken away, of a multiple transducer head and carrier device, in which the present invention is implemented, shown as mounted on a movable carriage, as used in a transducer system, which communicates with both sides of a flexible medium, with the access mechanism and associated parts of the system omitted for simplicity, FIG. 2 is an enlarged partial side view. View of a portion of the transducer array device shown in Figure 1, Figure 3 is an enlarged spatial view of the lower transducer assembly of the device shown in Figures 1 and 2, as viewed generally from above, the mounting depicts the lower transducer in the lower transducer assembly 1, FIG. 9 is an enlarged spatial view of the lower transducer assembly shown in FIG. 3, as viewed generally from below, showing the arrangement of the various magnetic core elements of the lower transducer and electrical connection thereof with Wiring Terminals, FIG. 5 is an enlarged view in the top surface of a bending support embodiment applicable in the lower transducer assembly shown in FIGS. 3 and U, showing a broken transducer core placed therein in broken lines. 6 is a cross-sectional view of the bending support tilted in FIG. 5, generally taken along line VI-VI, FIG. 7 is an enlarged top plan view of the lower transducer assembly tilted in FIGS. 3 and k, showing the transducer-35 core section thereof has been removed, and the generally mounted in-line position is shown of the bending support of FIG. 5 in the housing section of the lower transducer assembly, 8 020408-17 - FIG. 8 is a cross-sectional view of the lower transducer assembly shown in FIG. 7, generally taken along line VIII-VIII, FIG. 7 is a bottom plan view of the lower one, in FIGS. 7 and 8 Fig. 10 'is an enlarged view, shown transducer assembly. illustrating the curved bending axis portion of the bending support shown in FIG. 6, FIG. 1T is a front view of the transducer head assembly shown in FIG. 7, with the position of the transducer core offset by a broken line. 12 is a top plan view of an alternative embodiment of a support frame or housing portion of the lower transducer assembly shown in FIG. 7, showing a recessed channel for receiving the outer frame of the bending support structure of FIG. H and prior to insertion therein of the bending support structure, FIG. 13 is a bottom plan view of the support frame shown in FIG. 12, FIG. 1 ^ is a section of the support frame shown in FIG. 13, generally taken along line XIV-XIV, 20, FIG. 15 is a sectional view of the support frame shown in FIG. 12, generally taken along line XV-XV, FIG. 16 is an enlarged side view illustrating the mutual angular arrangement t of it. the top oblique plane portion of the transducer head assembly housing shown in Figure 3, with respect to the edge of the transducer core mounted therein, Figure 17 is a front view of the magnetic core assembly portion of the transducer assembly shown in Figures 3 and H, 18 is a plan view of the magnetic core assembly shown in FIG. 17, FIG. 19 is a side view of the magnetic core assembly shown in FIG. 17, FIG. 20 is a partial view of the portion shown in FIG. Fig. 21 is an enlarged top plan view of the compass bracket bending 8020408 - 18. - carrying part · multi-transducer head and carrying device, where the upper arm transducer carrying arm construction is illustrated in cross section and the lower transducer carrying structure with broken lines. for the top transducer shown in FIG. 20, and FIG. "22 is a graphic illustrating a side shift state of a t transducer head as a result of rotating the transducer around a Y axis coordinate.

5. . Detailed description of 'the' invention.

Referring generally to the figures, a two-sided support structure is shown for a transducer head (hereinafter also referred to as electro-magnetic head), which construction is suitable for use in data transfer systems having a floppy disk: 1.0 ·· where "data is transferred to and from both sides of a" (floppy disk "). While the invention will be described in conjunction with its preferred embodiment application for use with a" floppy disk "data transfer system, it will it is clear that the principles of the invention apply equally to use in other fields.

15 geysens transducers with an electromagnetic transducer. While the preferred embodiment of the invention will be described with respect to a two-way data transfer system with a "floppy disk", it will be further understood that the principles of this invention apply equally to one-way data transfer systems.

Referring to Fig. 1, at 22 is shown a portion of a generally planar, flexible, magnetic recording medium in the form commonly referred to in the industry as a "floppy disk". The "floppy disk" 22 generally includes a rotatable, pliable, or flexible disk portion 22a housed in an outer protective shell or casing 22b. For simplicity, only a portion of the "floppy disk" 22 is shown, it being understood that the "floppy disk" generally includes a center hub portion (not shown) which is operatively engaged by a rotatable spindle (also not shown) for rotating the inner flexible disk portion 22a, now at speeds of about 360 revolutions per minute in the protective case 22b. It will be understood, however, that the invention also applies to other disk rotational speeds. The movable disc element 22a is constructed of a thin, flexible material, such as polyethylene terephthalate, about 76.2 µm thick, and has a magnetizable coating on its recording surfaces, such as an unoriented FegO®. During operation, data in magnetic form is written on the magnetic surfaces of the disk.

8020408 r - 19 -

This one. data are written in the form of spaced concentric concentric tracks on the disk, 22a, one of which is schematically indicated in FIG. 1, which tracks are suitable for receiving and transmitting electromagnetic data from one to 5 and the electromagnetic transducers, respectively, which are described in more detail below. The Protective Cover 22b of the "floppy disk" 22 has opposed and radially aligned slots in its upper and lower protective layers for exposing the magnetic tracks (t) of the rotary disk 22a for reading and writing operations through the magnetic transducer heads. A more complete description of a conventional "floppy-disk" structure and operation can be found in many references and patents, such as in "U.S. Patent 3,668,658, issued June 6, 1979." A movable carriage, a conventional embodiment of which can be used in these floppy disk systems, is generally tilted at 2b. The carriage 2b is movable radially with respect to the "floppy disk" 22 through. a device (not shunted) for optionally placing the transducer head assemblies carried by the carriage 2b at preselected radial locations along the "floppy disk" data recording medium 22a to thereby select desired magnetic tracks (t) of the disc 22a. For the purposes of this invention, the particular carriage structure 2b and its displacement drive mechanism is important in describing the transducer head support structure primarily to the extent that the carriage 2b provides a mounting base for the transducer support structures, which are described below. described. The carriage 2b is also generally important for defining a customer comparison plane (CEP), as described above. The further description of the invention presupposes that an appropriate carriage 2b and appropriate carriage drive means (not shown) are provided for operatively aligning the transducer heads, carried by the carriage 21, into operative inline position with a track. (t) from the disc 22a.

A lower transducer head assembly, generally designated at 30, is mounted at the front or "free" end of the carriage 2b. In the preferred embodiment, the outer shape of the lower transducer head assembly 30 is formed in the form of an eighth 8020408. 20-year old mulching, that tn. " the industry is commonly referred to as a "button head" embodiment. This "particular exterior shape of the lower transducer head assembly 30 has been used in the preferred embodiment for its constructive compatibility with existing" floppy disk "-5 carriage systems, so that the lower transducer head assembly 30 of this The invention may be used to directly replace these existing "button head" structures.

The lower transducer assembly 30 generally includes an outer support frame or housing 31, in the preferred embodiment, in a shape formed of one. plastic material. Referring to FIGS. 3 and 4, the top surface of the support housing 31 has a boyen saucer-shaped outer ring portion 31a terminating at one in it. generally flat, circular lumbar platform area 31b. The lower outer portion of the housing 31 defines a cylindrical collar. generally designated 15 at 31c, of which another is lower edge. form a field area suitable for binding to the carriage 2b. When binding the housing 31 to the carriage 2k, the bottom field region of the collar 31c actually rests. not directly on the carriage 2i +, but floats it in an adhesive binder material, to allow precise placement and alignment of the transducer assembly 30 on the carriage 2b.

The housing 31 further defines an internal bearing edge portion 32 (see Fig. B). Wire guide posts 33 'protrude toward the interior from the inner ridge portion 32, the ridge 32 defining a plurality of support holes for electrical connections, generally designated 3 ^. in FIGS. 8 and 9. A plurality of electrical terminals 35 are secured in the support holes 31 as healed in FIG. The top end face or field region 31b of the housing 31 has a cutout, generally designated 36, ( FIG. 7], for receiving a magnetic core assembly UO and portions of a bending support structure, described in more detail below.

The magnetic, head, or core assembly, generally designated at 0, may include any embodiment of ceramic spacers and magnetic core members, which together bond together generally determine a read and / or write transducer head construction . One such embodiment for the magnetic core assembly Uo, which embodiment can be used with the present invention, is disclosed in U.S. Patent 152,7 ^ 2, issued 8020408-21 on May 1, 1979. A more detailed description of the magnetic core assembly Ho. as applicable with respect to the nature of its mounting in the lower transducer head assembly 30 will be described in more detail below.

The magnetic core assembly ^ 0 is mounted on a bending support structure 50, shown in more detail in Figures 5 and 6. Referring to Figures 5 and 6, the bend support structure 50 in the preferred embodiment comprises a generally "cross-shaped" primary bend section 51 and an outer circumferential support ring or frame structure 52. For ease of reference, referring to Figures 5 and 6, the bend support structure 50 in construction and operation can be better described with respect to an XYZ rectangular coordinate system, wherein the X- and Y1 axis coordinates are perpendicular to each other, the general plane of the middle portion of the primary tube portion 51 being in the XY plane, 15 and the Z axis coordinate being perpendicular to the XY axis coordinates, the intersection of which is the origin of the coordinate system.

The primary bending section 51 includes a generally rectangular, flat, midfield section 51a, which forms a mounting surface for the magnetic core assembly ^ 0, the mounting position of which is shown in broken lines on the field region 51a in FIG. 5. primary flexure member 51 is resiliently mounted to the outer circumferential support ring or frame structure 52 by a plurality of flexure shafts 51b, which axes extend laterally from the midfield section 51a in a cantilevered blade manner in the X and Y axis directions. The outer connections of the bending shafts 51b are enclosed between and tightly bonded to a pair of octagonal window members, which form the outer circumferential support ring or window structure 52. In the preferred embodiment, the outer connections of the bending shafts 51b are spot welded to the pair of window members forming the outer circumferential support ring structure 52, although other suitable bonding techniques could be used. Supplementary material, generally designated at 51c, is added at the junction of the bending axes 51b in the Y direction with the midfield region 51a for reinforcing the bending axes extending in the Y direction. This also allows the magnetic core assembly h-0 to be located closer to the lateral edge regions in the Y direction of the midfield region 51a of the 8020408-22 primary rig assembly 51. This design limits the lateral distance between the sidewall of the magnetic core assembly U0 and the oblique housing surfaces, described in more detail below, to a minimum. A plurality of apertures, generally indicated at 5 * + », is formed by the midfield portion 51a, of the primary bending portion 51 and allows the downwardly extending magnetic core members, which together form the magnetic core assembly 1 + 0, possible therethrough below as shown in fig. h. The edges of the number of apertures 5I + are also used to accurately align the magnetic core assembly 1 + 0 'in a predetermined position on the midfield portion 51a of the bending support structure 50.

In the preferred embodiment, the primary bending member 51 is roughly formed from a quarter of a hard beryllium copper, which is then cured after molding, and is preferably 76.2 µm thick. 15 to 101.6 µm. It will be appreciated that other materials could equally well be used to construct the primary flexure member 51. The ring-r or frame members, which form the outer circumferential support ring structure 52, are of considerably thicker material (about 0.3 mm each thick in the preferred embodiment) to thereby provide a rigid support for the inner primary bend 51 secured thereto. The circumferential shape of the outer support ring construction 52 may be of any configuration to adapt to the particular structure of the support housing 31 to which the support ring construction 52 will be mounted. In the preferred embodiment, a generally octagonal shaped embodiment has been found to be particularly suitable for co-mounting in the octagonal shaped bearing housing construction 31. Although a "cross-shaped" carrying embodiment comprising the four bend shafts 51b has been shown for carrying the midfield area 51a, a number of other embodiments which contain more or less bending gases are furthermore possible.

A magnetic core assembly U0 is tightly bonded to the midfield portion 51a of the primary bending portion 51, and is aligned therewith to thereby cover the portion thereof, generally shown in broken lines in FIG. FIGS. 35 designations of the magnetic core assembly U0, used in the preferred embodiment, are shown in FIGS. 17-19. "The top surface of the magnetic core assembly is generally indicated. 8 0 2 0 4 0 8 - 23 -" At 1 + Oa. Koevel has a generally planar core indylak 1 + 0a healed, it will be appreciated that the principles of this invention apply equally to use with transducers having curved core end faces, and for spherical core end faces.

5 The read / write "leg" of the core assembly is indicated at 1 + 0b (Fig. 17 ") and the fishing leg". of the core assembly is indicated at 1 + 0c. In Fig. 18, the read / write slit is generally indicated by the line at 1 + 0d, and the fishing slits are indicated at 1 + 0e. When properly positioned in line with the field area 51a of the bending support structure, the edge of the read / write leg 1 + 0b of the core assembly is indicated at 1 + 0hb (Fig. 17) in engagement with the edge of the openings 5 ^ in the field region 51a, indicated at 5 ^ aa in Fig. 5.

As already indicated, the downwardly projecting magnetic core portions, which together make up the magnetic core assembly 1 + 0, pass through the openings 5 * + formed in the midfield portion 51a of the primary flexure portion 51. In the preferred embodiment, the portions of the magnetic core assembly bridging portions of these core pieces that extend through openings 5, preferably made using the retaining spring clamping technique disclosed in U.S. Patent 1+. 152.71 + 2, issued May 1, 19795 and incorporated herein by reference with respect to its important core engineering and assembly doctrine. Such retaining spring clips are generally indicated at 55 in FIGS. 1+. Likewise, the matching read / write and erase coils, generally designated 56 in FIG. 1+, are mounted on their associated downwardly projecting core Spots "1 + 0b and UOe, respectively, after the magnetic core assembly 1 +0 is bonded to the midfield portion 51a of the primary flexure portion 51.

When the magnetic core assembly 1 + 0 is securely bonded to the midfield portion 51a of the primary bending portion. 51, the mid-field field portion 51a of the bending structure will generally be rigid and rigid. However, the blade material, which forms the flexure shafts 51b, provides freedom of movement for the entire midfield portion 51a in the Z axis (see FIGS. 5 and 6) while limiting a rotary movement of the midfield portion 51a and the attached 35 magnetic core 1 + 0 around the X or Y axis coordinate. As a result of the stiffness and the respective widths of the bending axes. 51b ,. This also causes a rotational movement of the midfield region 51a around the Z axis coordinate 8020408 - 2k - and a frictional lateral displacement of the midfield portion 51a in the X-Y plane, as described in more detail below.

In the preferred embodiment, the bending support structure is mounted in the lower transducer assembly. 30 to the carriage 21 +, the midfield region portion 51a of the bending structure 50, which will be in the X-Y plane. lies substantially parallel to the CRP. The Z-asseorinate is therefore perpendicular to the CRP, and is thus defined for a composite system. The electromagnetic core assembly 1 + 0 10 is mounted on the bending structure 50 so that the general plane of the top surface 1 + 0a of the transducer head is in an X1-Y1 plane, which is parallel to the CRP and perpendicular to it. the Z axis coordinate. For the purpose of describing mutual movements of the various portions of this assembly, the "origins" of the XY and X1-15 Y1 coordinates have been respectively chosen to lie at the geometric midpoints of the midfield portion 51a and the top surface 1 + 0a of the transducer head 1 + 0 (see Figs. 5, 6, 17, 18 and 22). The Z axis coordinate therefore goes through the "origins" of the XY and X1-Y1 axes. A distinction must be made here between reference to movement around the Z axis coordinate, which goes through the XYZ coordinate origin , and movement in the Z direction or Z axis direction (which refers to general direction movement perpendicular to the CRP).

In the preferred embodiment, the "floppy disk" used with this transducer support device operates in such a manner that its nominal disk planes are optimally parallel to the CRP, and therefore also parallel to the X-Y and X1-Y1 planes. Therefore, when operatively mounted in the bottom transducer support structure 30, the top surface 1 + 0a of the core defines a comparison plane for the "floppy disk" and for the top transducer end face (to be described below), which remains substantially parallel to, the CRP but which plane can move freely in the Z axis direction The lower transducer assembly 30 is mounted on the carriage 2l + relative to the operating position of the "floppy disk" so that the top surface 1 + 0a of the transducer core 1 + 0 (ie the X1-Y1 plane penetrates slightly, ie slightly in the 35 (+) Z axis direction is above) the bottom nominal disk lacquer of the "floppy disk" to ensure the intimate contact between the surface of the "floppy disk" and the transducer core surface 8020408 - 25 '- UOa In the preferred embodiment, this penetration in the Z axis direction is about 0.2 mm.

The nature of the bending support structure suspension 50 is such that it allows very small rotational movement of the midfield region portion 51a of the uv assembly around the X and Y axis coordinates. This "small" rotation allows for improved intimate contact between the transducer core end face 1 * 0a and the bottom surface 22a of the "floppy disk" during perturbations in the movement of the surface of the "floppy disk" from its nominal disk face. However, 10 51b are sufficiently sized and "rigid" in shape so that they do not allow rotational movement about the X or Y axis coordinates, which would give rise to excessive lateral shifting, which may produce data errors in the system due to misplacement of the transducer core end face 1 * 0a (ie its read / write gap) with the recording track (t) This excessive lateral shifting of the transducer core end face UOa is actually a component in the nominal XY plane of the displacement due to the rotational movement of the transducer core around the X or Y axis coordinates (see fig. 22) This lateral displacement component is equal to (sine cK) (D), where in the script the core and D is the rotary arm, which comprises the perpendicular distance from the top surface of the midfield section 51a to the top core surface UOa. By minimizing this rotational movement around the X and Y axis coordinates, more accurate data transfer is achieved between the transducer core and the "floppy disk".

The stiffness and design of the bending support structure suspension 50 virtually eliminates lateral displacements of the transducer core end face 1 * 0a in the nominal X1-Y1 face caused by friction. These lateral shifts may be due to frictional drag forces on the transducer core end face kOa. due to a sliding frictional engagement between the disc surface 22a and the transducer core end face 1 + 0a. The stiffness and design of the bending support suspension 50 also practically cancels the rotational movement of the transducer core end plane ij-Oa around the Z axis coordinate in the X1-Y1 plane and thus prevents misplacement stagger errors between the transducer core 1 * 0 and the register track. t of the "floppy disk" thus improving data transfer. The freedom of movement of the bending support structure in the Z axis direction and its supported lower transducer core during a sustained 8020408-26 state operation and remaining parallel to the CRP improves the intimate contact of the disc while maintaining the core Uo and the track (t) align, and tends to smooth out surface irregularities of the disc, which in turn results in improved data transfer.

In the preferred embodiment, the bending shafts 51b are formed in a predetermined curved shape (as seen in cross-section, as in Fig. 6). The shape of the curvature is shown in more detail in the enlarged view of Fig. 10. In the preferred embodiment 10, it has been found desirable to bend the bending axes 51b in a manner for displacing the general plane of the field portion 51a from the general plane of the outer support ring or frame structure 52 over a predetermined distance, designated "AZ" in FIG. 10, and determined as (i ^ -h ^), the h ^ and h2 dimensions being shown in Fig. 10. In the preferred embodiment, an "AZ" size of about (-) 0.15 mm in connection with the illustrated and described bending construction has been found acceptable for allowing bending movement of the midfield portion 51a in the Z- axis direction of 50.8-76.2 yum. in response to the mean disturbances during a loading operation without any detrimental turning of the midfield portion 51a about the X or Y axis coordinate. As seen in Fig. 10, the left side of the figure is the portion of the bending axis 51 "b> connected to the midfield region portion 51a of the bending assembly, and the right side of the bending axis 51b is bonded to the circumferential support ring 52 of the bending construction It has been found that an "II Z" of zero and preferably negative (ie where the end of the bending axis connected to the field portion in the Z axis arrangement is relatively lower than the portion thereof connected to the support ring). is desirable to increase the stability of the bending support structure. When under these conditions a downward force (in the minus Z axis direction) is transmitted by the transducer core bo to the midfield region 51a, the bending axes 51b will move in a direction for the " removing "path length from the bending axes instead of adding or adding to the path length of the bending axes, as would be the case if a" positive "35" Δ Z "state tond. These down forces occur, for example, as a result of forces applied to the lower core Ao by the upper arm and core assembly (described in more detail below 8020408-27) during a loading operation or by disk perturbations.

In the preferred embodiment of the construction shown in the figures, the shapes and dimensions of the number of flexible shafts 51b are generally the same, however they do not have to be the same to meet the scope and purpose of this invention.

The widths of the bending shafts 51b in the preferred embodiment are each about 1.9 mm, their effective length (L of Fig. 10 'being equal to the distance of the bending axis 51b between the midfield portion 51a and the inner edge of the circumferential protection ring or frame 52) is about 1.7 mm. The particular curved shape of the bending axis arcs is a matter of design choice. In the preferred embodiment (referring to fig.

10), the center portion of a bend axis portion 51b comprises concentric, circular arcs with rays, shown at R1 and R2, the angle being between about 62 and 65 °. The bend part curvature in the first transition zone T1 includes concentric, circular arcs with relatively sharp-angle rays, shown at R3 and RU. The diffraction curvature in the second transition zone T2 comprises concentric, circular arcs with relatively sharp-angle rays, shown at R5 and R6. In the preferred embodiment, the combined length of the transition zones (T1 20 + T2) is 0.030 mm. The primary importance of bending the bending shafts in such an arcuate configuration is that when the bending part with such an arrangement is bent out in the minus Z axis direction, the relevant considerations regarding the bending shafts have to do with with bending moments of the bending gas material in the elastic region of the material instead of stretching or permanently deforming the material.

While a particular embodiment of a bending support structure 50 is shown, it will be appreciated that other variations of such a bending assembly can be realized within the broad scope and broad scope of the present invention. For example, although a four bend axis construction is shown, other structures using more or fewer bending axes can be constructed. It is also possible that a transducer support bending structure with a continuous bending segment connecting a midfield portion to a circumferential support structure, rather than a plurality of bending axes, could be designed.

A ground property to be retained by such a bending structure is that movement of the midfield portion of the 8020408 τ-28 - bending member is resiliently permitted only in the Z axis direction, with rotation about the X or Y axis coordinate practically is canceled except for minimal movement around the X and Y axis coordinates to maintain intimate contact of the data transfer surface of a transducer head carried thereby with the surface; of a rotating "floppy disk1". Under sustained loading operating conditions (discussed in more detail below), such minimum rotational weighting around the X or Y axis coordinate is preferably only an angular deflection of the order of 5-10 minutes. these persistent states, the lateral displacement component of the transducer core end face ^ 0a in the nominal X1 - Y1 plane (ie, the lateral displacement component of (sine oCKDjJ discussed above with respect to FIG. 22), minimal and does not easily give rise to data transfer errors For a usual D-dimension of 1.9 mm, this lateral displacement component equals 2.5-5 µm for an angular deflection of 5-10 minutes. Another property to maintain for the bending structure is that this structure shifts laterally from the midfield area in the XY plane due to friction-induced such lateral These shifts and also due to such lateral shifts of the transducer end face caused by rotating the transducer about the Z axis coordinate.

The bending support structure 50 may be secured to the transducer support frame or housing 31 by an insert molding technique or by a direct bond. The embodiment of the housing 1 shown in Figs. 3, 7, 8 and 9 shows a supporting structure, as it would appear, if the bending assembly were formed as an insert in the housing 31.

A preformed hiis embodiment 31 ', to which the bending assembly is bonded by non-insert molding techniques, is shown in FIG.

Referring to this (with corresponding portions of the housing 31 'to those of the housing 31 indicated by an accent designation), a groove or support channel 37 is generally formed in the same circumferential shape as the circumferential support ring structure 52 of the bending support structure 50 formed around the cutout 36 from the house 31 ".

The lower surface of the circumferential groove 37 forms a bonding seat for the outer circumferential support ring or frame 52 of the bend support structure 50. When the housing 31 'is used, the bend support structure is 8020408. 29 bonded to the housing 31 by a suitable adhesive material such as plastic or epoxy which is provided in the groove 37. In such joining, the transducer core parts 4-0 are preferably attached to the bend support structure after the bend support structure is bonded to the housing to facilitate alignment. Alternatively, the core members 10 may be bonded to the bending support structure 50 prior to bonding the bend support structure 50 to the housing 31 '.

Note.is ,. that the design, seen in top surface (fig.

7) of the cutout 36 in shape generally corresponds to the outer circumferential shape of the primary bend 51 but is slightly larger than that of the primary bend 51. Although not cut, this also applies to the size of the cut 36 'for the housing embodiment 31 '(FIGS. 12-15), so as to enable the bending support structure 50 to drop from the peripheral mounting groove 37 and associated cutout portions from above. When the bending support structure is properly secured in the housing 31 (or housing 31 '), movement of the primary bending member 51 in the Z axis direction and the transducer core assembly U0 mounted thereon will not be hindered by engagement with the housing 30 (or 30 '). Since the bending shafts 51b will not be covered by the housing 31 (or 31f) or any bonding material, they will also be free to move, thereby allowing the midfield portion 51a of the primary bending portion 51 to move in the Z axis direction and parallel to the CRP, as described above.

It will be apparent that for the purpose of description and depiction of the position of the bending support structure 50 in the housing 31, the magnetic core assembly U0 has been omitted from FIGS. 7-9.

Once the bending support structure 50 is bonded to (or by molding with an insert in.) The housing. 31 '(or 31) and the magnetic core assembly is mounted thereto, a magnetic shield ring 57 (see Fig. K) is secured in the bottom recess portion of the housing 31 and the wires of the coils 56 are bonded to the appropriate electrical terminals 35 »

The top surface of the housing 31 is configured to form a pair of forked bevel surfaces 38a and 38b disposed immediately adjacent to the cutout 36 for defining the bending axes 51b in the Y axis. The inclined surfaces 38a and 38b provide an evenly continuous slate surface that extends upward from the circle shape. The field field 31b of the housing 31 for guiding the "floppy disk" 22 into the proper operating position over the magnetic core assembly Uo during "insertion" of a "floppy disk". An enlarged view of the bevel 38a with respect to its location relative to the neighboring core assembly Uo is shown in more detail in FIG. 16. Referring to this, it is noted that the vertex of the bevel 38a is slightly above the upper end. is away from the sidewall portion of the core Uo so that an object such as a "floppy 10 disk" (shown in broken lines at 22) gradually travels over the surface of the oblique plane 38a until in regular sliding engagement with the top surface UOa of the magnetic core assembly Uo. It is also to be noted in Fig. 16 that in the preferred embodiment of this construction, the core assembly HO preferably also has a chamfered edge (shown at ItOaa) and preferably also rounded corners (not shown) to further facilitate inserting the disc. These considerations apply equally to the construction of the house 31 '.

It will be appreciated that the above transducer bending support structure of the lower transducer can be used with single floppy disk system as well as double sided data transfer systems. Design considerations for the various parameters of the bending support structure 50 will depend in part on the particular system by which transducer structure 30 is to be used. In the case of use with a double-sided "floppy disk" system, these desverification weights must include the effective "load" and "steady state" parameters associated with the top transducer support structure.

Referring to FIGS. 1, 2 and 20, the magnetic data transfer system 20 of the preferred embodiment for a double-sided data transfer is completed by an upper transducer support structure. An upper electromagnetic core construction, designated 1 + 0T 9 generally of a similar core assembly structure to that of the lower core assembly 40, is mounted on an upper support arm 61. " As shown in Fig. 2, the top transducer core ilO is generally disposed opposite to the direction of its electromagnetic core elements relative to the same elements of the lower core assembly 40 to minimize. limiting data transfer interference between operations performed by the top and bottom transducers, respectively. It can also be seen in Figures 2 and 20 that both the top and bottom 5 transducer cores 40 'and 40 channel regions 40g' and 40g respectively formed in the top surface and generally extending in the Z axis direction This channel is shown in more detail at 40g, fig.

19. These channels may or may not be present in transducer core designs. When present, as in the preferred embodiment, it has been found that the channel prevents a "partial" or lower than atmospheric pressure state between the transducer core end face and the disk surface, which state is different (due to the principle of Bernoulli) tends to be present when the disc is spinning. The core, sew. acts as a "flow disruptor" slot in the transducer core end face to prevent "sucking" of the disc and transducer end faces together during operation of the system.

In the preferred embodiment, the top transducer core assembly 40 is flexibly mounted by a matching compass bracket bearing structure, shown in more detail in FIG.

20 and 21. The core assembly 40 'is directly connected to: a compass bracket bending member 62, shown in "top" view in FIG. 21. The compass bracket bending member, in the preferred embodiment, comprises a thin sheet metal material provided with a number of cut-out portions, generally indicated at 62a, said portions circumferentially surrounding a midfield region 62b, to which region the core assembly 40 'is bonded.

A number of bridge sections, generally designated at 62c, span the cut portions 62a and connect the midfield area 62b to the bounding window material. of the compass bracket bending portion 62. This construction provides the midfield area 62b freedom of movement in the manner of a compass bracket. A plurality of cut-out portions 64 formed in the midfield area 62b allow the core "leg" extensions of the read / write 40b and erase heads 40c! going through it (similar to the cutout portions 54 of the lower bending assembly 50} »35 The general plane of the compass bracket bending part 62 is indicated in Figure 21 by the plane of the X2-Y2 axes. The origin of the X2-Y2 axis coordinates is called the "pivot" and is located in general 8020408 -32-.

also near the center of the arrangement members, which includes the active core portion U0 ', mounted on the body part 62. When the compass bracket body part is mounted on the upper arm 61 and placed in an active remaining condition, as shown in FIGS. 2 and 20 , the 5 X2-Y2 plane is optimally parallel to the CRP and to the top, nominal disk plane of the "floppy disk". When mounted on the upper arm assembly 61, a rigid post 65 engages the upper surface of the compass bracket bending member 62 at the "pivot". The post 65 prevents movement of the top bend in the (+) Z-axis direction at the pivot 10 'point, but allows a universal "free" compass stirrup pivot of the midfield area 62b in all other directions around the pivot. In the indicated preferred embodiment of the compass bracket bending section, angular deflections, up to about 15 ° from a Z axis passing through the pivot, are possible. The compass bracket movement of the upper transducer allows the upper transducer to maintain intimate contact with the surfaces of the "floppy disk" in conjunction with the lower transducer, even in the event of disruptions in the disc surface movement, which disturb the respective disc surfaces bring the nominal disc plane.

The upper support arm 61 is supported in a cantilevered manner by a leaf hinge 70 (see Figures 1 and 2). A leaf spring 71 exerts a fixed downward force in the (-) Z axis direction on the top transducer 10? Which is applied to the "floppy disk" and through the "floppy disk" on the bottom transducer. In the preferred embodiment, the leaf spring 71 exerts a force on the upper arm under sustained action, which produces a force of about 15 grams between the transducer heads, to ensure intimate contact between the transducers and the transducers. floppy disk. As operatively supported by the upper arm assembly, the top transducer core end face Ij-Oa 'is designed to be movable relative to the bottom transducer core end face 1 + 0a so that the two core data transfer end faces are always parallel to each other, the distance between the core end faces being equal to the instantaneous thickness of the rotating "floppy disk". This condition ensures intimate contact between the opposing transducer core end faces and the engaged surfaces of the "floppy disk", even if disturbances in the movement of the surfaces of the. the "floppy disk" from their 8020408 - 33 'nominal disk planes. The spring-loaded support structure for the upper support arm 61, shown in Figures 1 and 2, also allows the upper support arm 61 to rotate about its fixed end to swing the upper transducer 5 LO 'away from the lower transducer kO. when inserting and removing a disk from the system. A more detailed description of the upper wishbone assembly of the type disclosed herein can be found in the related patent application entitled "Transducer Supporting Assembly for Double Sided Floppy Disk" by inventors 10 Leonard E. Kronfeld and Ricky Madsen, Serial No. 82,237, filed on October 5, 1979. To the extent that the disclosures of the copending patent application are important for a description of an upper arm assembly useful with the present invention, they are incorporated herein by reference.

The present invention, when incorporated into a single or two-sided flexible disk data transfer system, provides improved operation over known structures during both the temporary "load" operation and the subsequent "steady state" operation. " Charging ”, as the term generally applies in this area, is the operation, where opposing surfaces. . faces of a rotating "floppy disk" for data transfer preparation are gripped enclosed between a transducer head and a pressure pad (for single-sided data transfer) or between a pair of opposed transducer heads (for two-sided data transfer).

To simplify the following discussions, a transducer head support structure, which includes the bend support principles of the present invention (as sheathed at 50 in the preferred embodiment), is referred to simply as the Z-axis bend structure. While the following discussion will refer to the particular bending support structure (50) described in the drawing and description, it will be understood that this Z-axis bend construction designation is not intended to limit the scope of the invention to the structure of the preferred embodiment, but that. all variations thereof, as limited only by the claims, are included. For further simplification, but not with the intention of limiting the scope of this invention, descriptions of such a data transmission system will assume that the J8 0 2 0 4 0 8-3: Z-axis bending structure is used for mounting, of a transducer head or core in the "bottom" or "bottom" head assembly of such a system,

The Z axis bending structure of this invention acts as a resilient shock absorbing member during a loading operation. During a loading operation, the top force-exerting sliding member (pressure pad or upper transducer head) forcibly engages the "floppy disk" with a relatively high impact force, and the "floppy disk" is sandwiched between the upper force-exerting portion and the bottom 10 transducer sliding head, which is supported by the Z axis bending construction.

The direction of the load impulse force is primarily in the (~) Z axis direction (referring to the axes, defined in the drawing hereof), De. steam power is transferred from the "floppy disk" and the lower transducer head to the Z-axis construction. At the first reception of such a loading impact force, the Z-axis bending construction will appeal. by initially moving the lower transducer carried thereby in the (-) Z axis arrangement. As associated with the preferred embodiment, the bend portion field region 51a will move in the (-) Z axis direction in a manner generally parallel to the CRP, as guided by the number of bending axes 51b. When moved in this manner, the Z-axis bending structure will absorb some of the kinetic energy transferred thereto by the accelerating mass of the top head or top pressure pad, and will convert it into potential energy resulting in a damping action. After the Z-25 axis bending structures have reached their maximum deflection in the (-) Z axis direction, they will release some of its potential energy by reversing its direction of motion and moving in the (+) Z axis- riehting. The damping (i.e., phyphoidal "set" time) will continue until a "medium equilibrium" state is reached.

At "medium equilibrium", the "loaded" lower Z-axis bend construction will have some deflection in the (-) Z-axis direction, as reflected by the "stiffness" of its bending axes in the Z-axis direction, and the loading force applied on. the bending assembly through the top pressure pad or top head. In the preferred embodiment construction 35 of the previously disclosed Z-axis bending construction, the bending shafts 51b have sufficient rigidity, so that the force of 15 grams exerted by the leaf spring 71 through the upper transducer ^ 0 'is only a minimum of 8020408 - "loaded" deflection. produces from the midfield portion 51a in the (-) Z-axis direction of about 2.5 µm.

The first loading impact force will be variable depending on many factors, such as the height of the "drop" of the pressure pad 5 or the top transducer and the preload force of the leaf spring 71. In the preferred embodiment of the Z-axis bending structure, when used with the Two-way data transfer construction disclosed herein, peak deflections of the flexible center section 51a of less than 76.2 µm in the (-) Z-axis direction desired for average .10 upper arm heights during loading conditions.

The shock absorbing and mechanical damping properties of the Z-axis bending structure during loading operations smoothes transducer engagement with the floppy disk compared to rigid transducer support structures, thus providing extended disk life. The improved damping property may also allow the drive manufacturers to omit expensive electrical networks currently used to control charge / discharge solenoids. Also, when used in a two-sided system, as disclosed herein, the upper and lower transducers will, if the parameters of the Z-axis flexure construction are selected in conjunction with the movement response time of the upper arm spring compression structure, so that the upper arm response time is sufficiently rapid is to "follow" the damping movements of the Z-axis bending structure to achieve sufficient intimate contact with both surfaces of the "floppy disk" to permit. 25 an effective data transfer with the disk during transient states, even "before" the physical or average equilibrium phase is reached. With the Z-axis bending construction of the preferred embodiment, a reduced brewing time to active data transfer of about 10 ms from the moment of contact between the top transducer and the disc surface is achieved. It is also clear that it is possible to design the upper loading arm assembly such that the impact force applied to the lower Z-axis bending structure during loading is minimal.

Because the bending axes 51b of. The Z-bend structures are designed to substantially prevent rotational movement of the flexible midfield portion 51a about the X or Y axis coordinate, even under significant movements in the Z axis direction, as experienced in 8020408-36, a loading operation such as temporary state, the damping movements of the Z-axis bending construction during the physical setting time following the charge surge, also do not enter data errors due to lateral shifting of the bottom transducer core surface. in the X or Y axis direction. 5 with respect to the selected recording track '(as discussed above).

Once "average equilibrium" is reached following a loading operation, the top and bottom transducers and the "floppy disk" will be placed in their operative "steady state" positions. As said before in. the preferred embodiment of the disclosed construction, the "nominal" state of. the lower transducer h-0, carried by the Z-axis bending structure, when in its loaded state j, is preset so that the disc engaging surface (ie the disc surface in the X1-Y1 plane) of the lower transducer head core penetrates slightly the bottom nominal disk face of the "floppy disk" 15 to ensure intimate touch during a sustained state operation. By permitting some movement under operating persistent state conditions in the Z axis direction and a very small rotational movement around the X and Y axis coordinates, as described above, the present invention improves data transfer and limits to a minimum of data errors inherent to known two-sided compass bracket constructions due to transducer misplacement shifts from the recorded track data. As mentioned before, the "floppy disk" will experience some disturbances in movement from its nominal disk surfaces during rotation, for example due to wobbling and surface imperfections. These perturbations will produce scratches, primarily with Z-axis vector components, which will impart kinetic energy to both the top and bottom head assemblies. With the construction of the preferred embodiment, "both" the spring tensioned top transducer supported by a compass bracket 30 "and" the bottom Z-axis bending structure address these forces. However, the relative ways of addressing the top compass bracket support structure and the Z-axis bend structure will differ (i.e., they will exhibit mutually different motion adaptation to such forces when compared to each other).

35 The upper compass bracket support structure can move freely in a universal manner in all directions around its fixed pivot except the (+) Z axis orientation. In contrast, movement of the Z-axis bending structure in all directions (as described above) except for the Z-axis direction is substantially prevented, and will exhibit a relatively stiff response movement. Therefore, it will act as a stabilizing influence to aid in smoothing the disturbances. However, the fact that the Z axis bend construction can address primarily with a Z axis deflection and with some rotational deviation around the X and Y axis coordinates in conjunction with the rotational movement of the top head allows for improved data transfer touch between the disc and the transducer at very low cost of 10 X and Y plates. These are errors or lateral shifts. significantly reduced compared to known shifts inherent in the two-sided compass bracket transducer support structures.

In addition to the aforementioned advantages of the Z-axis bending structure over known constructions, the present invention also provides an improved "steady state" operation as compared to known two-sided compass bracket members by providing improved resistance to lateral shear and XY-ylak caused by frictional forces applied to the lower transducer head by the spinning floppy disk. When the?! Floppy disk "rotates with its surface in frictional engagement with the lower transducer head, it imparts lateral shear forces through the lower transducer head to the flex field area 51a, which is translated as vector forces in the XY plane of the flex field area 51a. "or offset forces may lead to geyser errors in two-sided compass bracket constructions, where the movement of the compass bracket bend bearing surface is relatively" soft "in the comparable XY plane, but is minimized by the Z-axis bend construction of this invention. In the preferred embodiment of the Z-30 shaft bending structure, the bending shafts 51b have sufficient width to effectively prevent this lateral displacement. The bending axes 51b oriented in the Υτ axis direction will tend to prevent transducer displacement caused by vector forces in the X axis direction, and the bending axes 51b oriented in the X axis direction will tend to prevent transducer displacement caused therefore, the Z-axis bending construction of the present invention provides improved work results in not only its 8020408 - 38 shock absorbing damping properties during temporary loading operations, but also in its improved intimate touch and reduced twisting and sliding movement during persistent state data transfer operations.

In addition to the aforementioned features and advantages of the present invention over known structures, the construction of the present invention is much easier and less expensive to construct and maintain than the two-sided compass bracket construction. Furthermore, the more robust construction of the lower transducer support structure allows the present invention to use greater applied forces between the upper and lower transducers compared to two-sided compass bracket constructions and compared to fixed, lower head assemblies.

It will be recognized that the design parameters for the various portions of the lower transducer support structure, in particular the design criteria for the bend support structure 50, are necessarily related to the downforce exerted on the lower magnetic core assembly ^ 0 within the particular data transfer system used. , by an upper pressure pad in a single-sided system or by the upper transducer and the associated spring-loaded suspension arm structure in a two-sided system. Accordingly, it will be recognized that not only can the basic configuration and shape of the bending support structure 50 itself be changed within the scope of this invention, but there is also significant design flexibility for changing the basic parameters of one particular embodiment. of the bending support construction. By way of example only with respect to the preferred embodiment of the bending support structure 50, the thickness and the type of bending material may be changed, which change may be uniform or optionally with respect to different portions of the bending assembly. The size (i.e. length, width and thickness) of the bending axes can be changed regardless of the dimensions of the rest of the bending structure. The geometric cross-sectional shapes and shapes of the bending axes can be changed, as can the number and arrangement of the bending axes 35 relative to the center support field portion 51a of the bending assembly.

It will be understood that the value of "& Z" can also be changed. The shape and shape of midfield area 51a. relative to 8020408 - 39 - the bending axes 51b can be changed. The shape and shape of the outer circumferential support ring or frame portion 52 of the bending support can be changed and even completely omitted in favor of other methods of securing the bending axes or the midfield portion 5 of the bending assembly. to the load-bearing housing 31. Other changes made within the scope of this invention will also be apparent to those skilled in the art.

From the foregoing description, it will be apparent that the present invention has many of; solves the difficulties or shortcomings associated with known electromagnetic transducer support structures. It will be understood that while a particular application for the present invention, as used in conjunction with two.

Sided transfer of data to a "floppy disk" recording medium has been disclosed, the invention is also applicable to other types of data recording applications. Although a certain version of a house and one. Certain shape and shape of a bending support structure are depicted with respect to the description of the preferred embodiment of this invention, it will also be appreciated that many other changes to the housing and the bending support structure are possible within the scope and broad scope of this invention. Other modifications of the invention will be apparent to those skilled in the art in light of the foregoing description. This description is intended to provide certain examples of individual embodiments, which are clearly disclosed in the present invention. Accordingly, the invention is not limited to the described embodiments or to the use of certain elements therein. All possible modifications and changes of the present invention, which are within the scope and broad scope of the appended claims, are covered.

30 8020408

Claims (28)

1. Head assembly for magnetic recording structures of the type, using a non-rigid, flat, rotating, ..... magnetic recording medium, characterized by (a) first and second sliders, each having at least one surface, which is suitable for a sehuif engagement of the planar recording surfaces of a rotating, non-rigid magnetic recording medium, at least one of these sliding parts comprising a magnetic transducer which can transfer data through its intended one surface to the respective record registration surface. of, the recording medium, further by (b) means 10 for mounting each of the first and second sliders for independent movement, so that the intended one surfaces of the first and second sliders exhibit different mutual adaptation in response to forces exerted thereon for the temporary loading and permanent operations. through. (c) positioning means 15 for carrying the mounting means and the sliding parts on one in the. generally opposite each other so that the said one surfaces of the sliding members operatively engage the opposed recording surfaces of the recording medium, and through (d) means operatively associated with the locating means for each 20 squeezing the sliders with a fixed, predetermined force, thereby effectively enclosing the rotary recording medium between said one surfaces of the opposing sliders. 2. Head assembly for magnetic recording structures, as defined in claim 1, characterized in that the mounting means further comprise a first mounting structure operatively carrying the first sliding part in such a manner that the intended one surface of the first sliding part is substantially stopped in a movement in all directions with the exception of the. Z axis direction, perpendicular to the general plane of the engaged recording medium surface, so that the general plane of the intended one surface of the first slider is substantially. remains parallel to the general plane of the recording medium surface during a movement of said one surface in the Z axis direction. 3. Head assembly for magnetic recording structures, as defined in claim 2, characterized in that the first mounting structure 8020408 - Option comprises means "for resiliently supporting the first sliding member for movement in the Z axis direction and to allow limited rotational movement of the first slider around X and Y axis coordinates, placed at right angles to a Z-5 axis coordinate, generally passing through the geometric center of the intended one surface of the first sliding part. Head assembly for magnetic recording structures, as defined in claim 2, characterized in that the first mounting structure further comprises bending means for resiliently supporting the first sliding part, which bending support means are movable in response to force vectors. in the Z axis direction, transmitted thereto by the first sliding member, but being substantially immovable in response to kr eight vectors applied thereto from directions other than the Z axis direction. Head assembly for magnetic recording constructions, as described in claim 'U, characterized in that the positioning means comprise at least one rotatably movable carrying arm for moving at least one of the first and second sliding parts relative to the other sliding part, so that the sliding members co-operating towards and from opposing enclosing engagements move with the recording medium during loading and unloading operations, respectively, whereby the bending means absorb impact forces in the Z-axis direction, which forces are transmitted thereto from the second sliding portion during the loading engagement of the first and second sliders with the recording medium. Head assembly for magnetic recording structures, as defined in claim 2, characterized in that the mounting means further. a second mounting structure operatively carrying the second slider in a manner whereby the intended one surface of the second slider is universally movable about a fixed pivot, but is restrained from moving in the Z axis direction in the fixed pivot. 7. Head assembly for magnetic recording structures, as defined in claim 6, characterized in that the second mounting structure comprises a compass bracket bending part and a fixed post part, which operatively engages the compass bracket bending part at a location defining the fixed pivot point. preventing movement of the pivot point in Z- 8020408 - b2 -. axis direction. 8. Head assembly for magnetic recording structures, as defined in claim 6, characterized in that the locating means comprise spring pressure means operatively connected to the second mounting structure for 'allowing the second mounting structure to be movable' in the Z- axis direction in response to forces exerted thereon. Head assembly for magnetic recording constructions, as defined in claim 8, characterized in that the positioning means 10 further comprise at least one rotatably movable carrying arm for moving at least one of the first and second sliding parts relative to the other sliding part, so that the sliding parts working together moving towards and from opposite enclosing engagement with the recording medium during loading and unloading operations, respectively, the bending means absorbing impact forces in the Z-axis direction, which forces are transmitted thereto from the second sliding portion during loading engagement of the first and second sliding parts with the recording medium. 10. Head assembly for holding a pair of magnetic transducers in operative relationship with both surfaces 20 of a non-rigid, flat, rotating magnetic recording medium, characterized by (a) a first transducer, having a generally flat data transfer terminal. flat and suitable for transferring data in magnetic form to a first side of a non-rigid, flat magnetic recording medium, further by (b) first mounting means for mounting the first transducer in a data transfer position relative to the first side of the recording medium such that movement of the first transducer relative to the mounting means in all directions except in a Z axis direction perpendicular to the general plane. of the medium 30, regardless of movement of the transducer and mounting means to different positions along the general plane of the medium, is prevented by (e} a second transducer having a data transfer end face and suitable for transferring data in magnetic form to a second side of the magnetic recording medium, through second (d) mounting means for mounting the second transducer in a data transfer position relative to the second side of the recording medium such that the data transfer end face k \ 8020408 r-.k3- the second transducer is relatively free to move in a compass bracket manner about a pivot, which is fixed with respect to the second mounting means, but avoids movement of the end face in the Z axis direction in the pivot, by (e) carrying means 5 operatively carrying the first and second mounting means according to a generally opposite r relative to the recording medium such that the data transfer end faces of the first and second transducers slidably engage the first and second recording surfaces in an opposed manner. TO recording medium, the recording medium being interposed therebetween, by (f) spring pressure means operatively connected to the carrier means for pressing the data transfer end faces of the first and second transducers together with a fixed predetermined force, which force is sufficient for maintaining an effective sliding engagement between the data transfer end faces and the opposing surfaces of the recording medium regardless of deviations during the rotational movement of the first and second recording surfaces from their nominal faces. 11. Head assembly as defined in claim 10, characterized in that the first mounting means comprise means for resiliently supporting the first transducer for movement in the Z-axis direction and for allowing a limited rotational movement of the first transducer. coordinator around K- and Y-axis coordinates, placed at right angles to a Z-axis coordinate, generally passing through the geometric center of the data transfer end face of the first transducer. 12. Head assembly as defined in claim 10, characterized in that the first mounting means comprise bending means for resiliently supporting the first transducer for movement in the Z axis direction, so that the data transfer surface of the first transducer is substantially parallel is held to the general plane of the recording medium during a movement of the first transducer in the Z axis direction. 13. Head assembly as defined in claim 12, characterized in that the bending means have resilience to forces transmitted thereto in the Z-axis direction, which resilience is sufficient to effectively absorb and damp large transient impact forces while maintaining response. at smaller permanent state forces, 8020408 τη Ml - 1¼. Head assembly as described in claim 12, characterized in that the carrier parts contain parts which have been operatively proclaimed with the second mounting means for allowing the second mounting means to yield in the Z-axis direction in response to forces 5 applied in the Z axis direction to the data transfer end face of the second transducer during a rotating, sustained state operation of the magnetic recording medium. Head assembly as defined in claim 10, characterized in,. . that the carrying means comprise a rotatable carrying arm, the second. .. TO; mounting means and the second transducer are rotatably supported by this support arm and movable to and from opposite sides. connection with the first mounting means and. the first transducer during charge and discharge operations of the head assembly, respectively, 16. Magnetic transduet or head assembly, particularly suitable for use in data transfer systems of the kind, using non-rigid, flat, rotating magnetic recording media, characterized by (a) a transducer, having a data transfer surface, which is adapted for slidably engaging a surface of a planar, rotating magnetic recording medium, and by (b) a transducer support structure carrying the transducer resilient motion in a Z axis direction substantially preventing movement of the general plane of the data transfer end face of the transducer in all other directions, which Z axis is defined as an axis perpendicular to the general plane of the data transfer surface of the transducer when mounted on the support structure sun that external forces are exerted on the transducer. 17. Magnetic transducer head assembly, as defined in claim 16, characterized in that the transducer support structure permits limited rotational movement of the transducer around X and Y axis coordinates placed at right angles to a Z axis coordinate, passing through the geometric center of the data transfer surface of the transducer. 18. Magnetic transducer head assembly as defined in claim 16, characterized in that the transducer supporting structure comprises (a.) A housing adapted to engage a supporting surface lacquer and (b) bending supporting means mounted on the housing for supporting the transducer for resilient movement substantially in the Z axis direction only. 19. A magnetic transducer head assembly as defined in claim 18, characterized in that the bending support means are circumferentially mounted on the housing in a suspension manner. 20. Magnetic transducer head assembly as defined in claim 18, characterized in that the bending support members are provided with (a) a transducer mounting part. to which the transducer is rigidly mounted, and (b) resilient bending means extending from the. 10 transducer mounting member and are secured to the housing for resiliently carrying the transducer mounting member for movement substantially in the Z axis direction. ... 21. Magnetic transducer head assembly as © defined in claim 20 with. characterized in that the resilient circumferential bending means carries the transducer mounting portion in the housing in a cantilevered, sheet-like manner, the transducer mounting portion generally being in the center of the transducer mounting portion. the house is placed. Magnetic transducer head assembly as defined in claim 20, characterized in that the housing further comprises an upper field portion circumferentially extending about the supported transducer, the transducer data transfer surface extending in the Z axis direction above the general plane of the upper field portion of the house. 23. Magnetic transducer head assembly as defined in claim 20, characterized in that the resilient bending means comprise a plurality of leaf shaped gas tube sections extending between the periphery of the transducer mounting section and the housing, whereby the transducer mounting section is suspended by and between the bending axis parts. 2k. Magnetic transducer head assembly as defined in claim 23, characterized in that the gas sections comprise thin metal sections having width dimensions considerably larger than their depth dimensions, measured in the Z-axis direction. 25. Magnetic transducer head assembly as defined in claim 23, characterized in that the bending axis parts comprise at least two bending axis parts oriented along rectangular X-r and Y axes, each X and Y axes being perpendicular to the Z axis direction. 26. Magnetic transducer head assembly as defined in claim 8020408 - k6 ~ 23, characterized in that at least certain bend shaft parts are bent in the direction of movement from the transducer mounting part to the end of the bend shaft parts secured to the housing, 27. Magnetic transducer head assembly as defined in claim 26 characterized in that the bend is generally arcuate in the Z axis arrangement. 28. Magnetic transducer head assembly as defined in claim 23, characterized in that the axial axis parts are formed such that the general plane of the transducer mounting part in the Zr axis direction is off-10. the general plane of the ends of the bending axis parts secured to the housing. 29. Magnetic transducer head assembly as defined in claim 20, characterized in that the resilient bending means in the Z axis arrangement are formed such that the general plane of the transducer mounting member in the Z axis direction is spaced from the general plane of the portion of the resilient bending means secured to the housing. 30. Magnetic transducer head assembly as defined in claim 18, characterized in that the bending support means comprises (a) 20 a transducer mounting part, to which the transducer is fixedly mounted, further from (b) a plurality of resilient bending means, generally mounted on the periphery of the transducer mounting member and outwardly cantilevered therefrom, and of (e) circumferential support means operatively connected to the outwardly projecting ends of the support means for rigidly securing the outwardly projecting ends, the head assembly further includes means for securing the circumferential support frame means to the housing, whereby the transducer mounting member is suspended from the circumferential support frame means by the plurality of bending means. 31. Magnetic transducer head assembly as defined in claim 30, characterized in that the housing includes a seat portion having a surface area sized to accommodate the circumferential support frame togetherly, the circumferential support frame being securely bonded to the seat portion of the housing . A magnetic transducer head assembly as defined in claim 30 characterized in that the housing has an upper surface, the seating portion in the housing being channeled so that the common surface is 8020408. the surface of the seat portion in the Z-axis direction is spaced below it; general plane is from the upper part of the house. 33. Magnetic transducer head assembly as defined in claim 20, characterized in that the resilient bending means extend continuously from the transducer mounting member. 3 ^ ·. Magnetic transducer head assembly as defined in claim 33, characterized in that the transducer mounting means and the resilient bending means are formed from a single piece of thin, resilient material, the transducer mounting portion of the material being generally rigid when the transducer is bonded thereto. 35. Magnetic transducer head assembly particularly suitable for use in data transmission systems of the kind, using non-rigid, planar, rotating, magnetic recording media, characterized by (a) a transducer, comprising a generally spherical data transfer surface suitable for slidably engaging one surface of a flat rotating magnetic recording medium, and by (b) a transducer support structure carrying the transducer for resilient movement in a Z axis direction 20, substantially preventing an movement of the data transfer end face of the transducer in all other directions, the Z axis defined as an axis coinciding with a radius of the data transfer surface and perpendicular to a plane tangent to the data transfer surface highest effective point when the transducer is mounted on the support structures e without external forces being applied to the transducer. 3.6. Magnetic transducer head assembly as defined in claim 35, characterized in that the transducer support structure permits limited rotational movement of the transducer about X and Y axis coordinates positioned at right angles to the Z axis. 8020408