IMPROVED REVERSE RAIL HEAD SUSPENSION

Abstract: An improved magnetic head suspension (10) having improved dynamic performance enhanced by stiffening flanges (70) projecting from the top surface of the load beam element (16) toward the side of the beam element (16) to which the magnetic head (not shown) is to be mounted, the flanges (70) covering only a portion of the length of the distal end (24) of the load beam (16).

Description: IMPROVED REVERSE RAIL HEAD SUSPENSION Background of the Invention This invention is directed to an improved magnetic head suspension for use with dynamic magnetic storage apparatus. More particularly, it is directed to a magnetic head assembly that has an improved stiffening flange structure and other improvements to increase the dynamic performance of the head suspensions. Conventionally available magnetic head suspension assemblies, used for radially accessing different concentric circular data tracks of a rotating magnetic disk, are subject to different forces causing the suspension to pitch about a first axis and roll about a second axis orthogonal to the first axis. The present invention is designed to reduce or minimize the effects of these forces as applied to a suspension assembly. In accordance with the present invention it has now been discovered that by forming the reinforcing flanges on the same side of the load beam as the magnetic head is mounted (rather than on the opposite side as is done in the prior art) and by utilizing other innovative design improvements in combination with the so-called reverse rail or flange, the static and especially the dynmic performance capability of the assembly can be greatly improved. Aditionally the overall spacing of the disks can be substantially reduced The improved head suspension according to the present invention provides an attractive and desirable alternative to the standard rails or flanges of the prior art, particularly as the improved rails or flanges are combined with other improved structural features as described below. Brief Description of the Invention The magnetic head suspension according to this invention includes a spring load beam element joined to an arm upon which the suspension is to be mounted the proximal end of the load beam. The beam is substantially resilient at its proximal end and substantially rigid for its remaining length, and includes top and bottom substantially rigid planar surfaces and stiffening flanges which project from edges of the top surface of the load beam element which are oriented to project toward the side of the beam element to which a magnetic head is to be mounted. The suspension also includes flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element. The flexure means projects beyond the distal apex of the element and has an aperture in the flexure portion to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece. The flexure means also includes a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms. Brief Description of the Drawings Figure 1 is a top perspective view of the magnetic head suspension assembly in accordance with this invention; Figure la is a sectional view of the distal end of an assembly similar to that shown in Figure 1 with the section taken through the protuberance which is formed in the load beam rather than the flexure as illustrated in Figure 1; Figure 2 is an exploded detail view of one embodiment of the distal apex portion of the beam element shown in Figure 1; Figure 3 is an exploded detail view of another embodiment of the distal apex portion of the beam element shown in Figure 1; Figure 4 is a perspective view of a constraint as used in prior art suspension assemblies; Figure 5 is a top perspective view of another magnetic head suspension assembly in accordance with this invention; Figure 6 is a cross section of the load beam of Figure 5 showing details of the structure of the stiffening flanges taken along the section lines 6-6 of Figure 5; Figure 7 is a cross-sectional view of the distal apex portion of the load beam of Figure 5 taken along section line 7-7 of Figure 5; Figure 8 is an expanded detail view of the distal apex of a load beam of the type shown in Figure 5 wherein the distal portion of the beam is extended and relieved and the stiffening flange and a portion of the beam is cut away; Figure 9 is a side elevation view of the detail shown in Figure 8; Figure 10 is a perspective view of a flexure for use in the present invention as it may be manufactured with side tabs; and Figure 11 is a top view of the distal apex of a beam in accordance with the invention herein showing the improved wire guide tabs. Detailed Description of the Preferred Embodiment Referring now to the drawings, Figure 1 illustrates a preferred form of a magnetic head suspension assembly formed in accordance with the teachings of this invention. Generally, the magnetic head suspension assembly according to this invention is of the type known within the industry as a Watrous suspension system of the type described by U.S. Patent Nos. 3,931,641 and 4,167,765. For a more detailed discussion of the structure and use of Watrous suspension systems and disk drive systems generally, reference is made to these two patents, which are specifically incorporated by reference into the disclosure of this application for that purpose. Referring now to Figure 1, the head suspension is generally designated as 10. The suspension 10 is mounted on a rigid arm of an actuator for a magnetic disk drive utilizing a swaging boss 12 which projects upwardly from a base plate 14 which is positioned against the bottom planar surface of a spring or load beam element 16. A series of welds 18 secures the base plate to the bottom surface of load beam 16. The swaged connection of the load beam 16 to a rigid arm, which may be part of an assembly of rigid arms known as an E block, is well-known in the industry and not described further herein. Alternatively, other base plate structures can be utilized which provide for securing the load beam to the mounting arm utilizing screws, welding, bonding or any other suitable connecting means. As shown in Figure 1, load beam element 16 is, in the preferred embodiment shown, formed from a sheet of stainless steel, preferably a hard or 300 series alloy, having a nominal sheet thickness between .002 and .004 inches. Beam element 16 has top and bottom planar surfaces which have a width at the proximal end, adjacent to the arm, which is approximately equal to the width of the arm and then tapers to a second width at a distal apex 24. Beam element 16 is resilient at its proximal end, adjacent to base plate 14, but is substantially rigid for its remaining length. The rigidity is enhanced by providing, in the embodiment of the invention illustrated in Figure 1, downwardly oriented stiffening flanges which project downwardly as viewed in Figure 1. The vibrational damping characteristics of beam element 16 are enhanced by providing tubing sections 26 and 28 which are secured to beam element 16 and the stiffening flanges by tube capture flanges or wire guides 30, 32, 34 and 36 positioned on opposite edges of the planar surface of load beam element 16 as shown in Figure 1. Tube capture tab 32 has a longitudinally elongated surface 32a which is constructed for engagement by a head lifted mechanism (not shown) which may be a part of the disk drive assembly in order to avoid direct contact of the head lifter with the edge of the stiffening flange. In the stucture shown in Figure 1, the tube wire guides 26 and 28 are secured to the spring load beam element, utilizing wire captures 30, 32, 34 and 36 in particular, to provide a high degree of damping for the first torsional resonance mode of the load beam which is swaged to an E block. A typical load, a magnetic head (not shown) , is mounted at and below the distal apex 24 of the load beam. As shown in Figure 1, the flexure piece 50 is affixed to the distal apex 24 of spring element 16 by a weld 42 to join it to the bottom planar surface of element 16. In the embodiment shown in Figure 1, a constraint member 44 is welded, at a plurality of locations 46, to the top surface of the load beam element. The details of the structure in the vicinity of the distal apex 24 of beam 16 are shown in an exploded view in Figure 2. The distal apex 24 of the spring beam element 16 is shown as a projecting portion upon which constraint member 44 is positioned on the top surface and below which the flexure piece 50 is mounted. The flexure piece 50 is cut out about an aperture 52 to define a pair of outer flexible arms 54 and 56 which are generally parallel to the longitudinal axis of symmetry of load beam 16 which passes through the center of the swaging boss 12. The cross leg 58 connects the outer flexible arms 54 and 56 and a flexure tongue 60, connected to the cross leg 58, projects into the aperture between legs 54 and 56 and has a dimpled load protuberance 62 which is constructed and arranged for contacting a point on the apex 24 of load beam element 16. It is, of course also possible to provide protuberance 62a on the load beam element 16 and have that protuberace bear against the planar surface of the flexure means 60. A cross sectional view of an assembly similar to that shown in Fig. 1, taken through the dimpled protruberance in the load beam is shown as Fig. la. Although dimpled load beams are known for load beams with standard upwardly oriented stiffening flanges, their incorporation in suspensions utilizing the unique features claimed herein gives unexpectedly superior resonance control characteristics. As the part is manufactured, flexure piece 50 is positioned relative to the surfaces of spring load beam element 16 by using tooling hole or aperture 66 which is aligned with a corresponding hole or aperture 68 which is in the vicinity of the distal apex portion 24 of load beam element 16. The torsional damping and vibration affecting characteristics of the magnetic head suspension are controlled, in addition to use of the tube structures 26 and 28, by the downwardly projecting stiffening flanges 70 which can be best viewed in Figure 2. The flanges 70 project from a point near the distal apex 24 of the load beam element 16 back to a point 74 which is in the vicinity of the proximal end of the base plate 14 but does not extend all the way to the base plate. This can be seen in Figure 2 the downwardly projecting flanges 70 are bent downwardly from the planar portion of load beam element 16 along a first score line or radius 78 and then bent along a second score line or radius 80 to form a surface 82 which is generally parallel to the planar surface of load beam element 16 and into which the tubing portions 26 and 28 can be positioned where they are in turn secured by the wire capture 30 in the vicinity of the distal end and 32 positioned in the vicinity of the proximal end and the termination point 74 of flanges 70. Figure 3 shows, in exploded form, a different embodiment of the flexure piece utilizing the present invention. Constraint 44 is positioned above the distal apex portion 24 of load beam 16 and a 90 degree offset flexure 90 is positioned below the bottom planar surface of load beam element 16. The outer flexible arms 92 are oriented with their axes perpendicular to the longitudinal symmetrical axis of load beam 16 rather than parallel as in the embodiment shown in Figure 2. The tongue 94 of the flexure is joined to the cross leg 96. As can be seen in Figure 3, the distal apex portion 24 of beam element 16 has a pair of relieved sections 98 which provide clearance for movement of the flexible arms 92 of flexure piece 90 perpendicular to the surface of the load beam element 16. Either the normal flexure 50 or the 90 degree offset flexure 90 can be utilized with the embodiment of the load beam element shown in Figure 16 utilizing the downwardly facing flanges 70 and with the tubing sections 26 and 28. In the embodiment shown in Figure 1, the wires 102 for connecting to the magnetic head and conducting signals to and from the head are positioned only in tubing section 26 although it is merely a matter of mechanical design choice whether both or only one of the two tubing sections 26 and 28 are used. By orienting the side flanges downwardly and by only having them project for a portion of the length of the load element 16, the invention as realized in the embodiment of Figure 1 provides superior damping characteristics while allowing for very compact mounting arrangements over prior art structures such as those shown in the Watrous patents cited above. The constraints 44 shown in Figures 1 through 3 have a distal surface configuration which generally matches the distal apex 24 of load beam element 16 which it overlies. A pair of constraint side tabs 45 allows for the accurate positioning of constraint 44 during the assembly process. In contrast, the prior art structures for constraints such as element 110 in Figure 4 required the use of a tooling hole 112 to allow accurate positioning during the assembly process and had length and width dimensions substantially exceeding those of the reduced area constraint 44 shown in Figures 1 through 3. The use of the constraint 44 is possible to provide additional stiffening to the load beam 16 in areas such as the apex portion 24 of load beam 16 where stiffening flanges 70 are not utilized. Sufficient stiffening can be accomplished utilizing the reduced area constraint 44 rather than the prior art constraint 110 which results in a very high suspended mass which substantially detracts from the resonance performance of the spring load beam element 16. The provision of constraint side tabs 45 for locating constraint 44 rather than the utilizing the side edges and mounting hole of the prior art constraint 110 represents a substantial advance which allows for greatly increased performance. Figure 5 shows a different embodiment of the present invention. The load beam element 16 has an a load beam cut-out or aperture 120 removed from the surface at the proximal end of the tapered portion between the termination point 74 of sidewall 70 and base plate 14. The removal of the sheet material of beam element 16 in the vicinity of the base plate allows the spring load beam element to be quite resilient in the vicinity of its proximal end, while, because of the stiffening effect of flanges 70 it is also relatively rigid for its remaining length. The cross sectional view in Figure 6 shows the structure of the downwardly directed flanges 70. The flanges are formed about a first radius or score line 78 and, in the embodiment shown in Figures 5 and 6, are scored or bent on a second radius 80. In embodiment shown in Figures 5 and 6 the surface 80 which is outside of bend radii 78 and 80 is angled upwardly relative to the top planar surface of spring load beam element 16. The stiffening flanges 70 with the two oppositely oriented bend radii 78 and 80 provide additional surface for lifting the load beam and are extremely stiff and greatly increase the rigidity of the portion of the load beam element from the flange termination point 74 to the termination in the vicinity of the apex 24. Figure 7 is a sectional view of the apex 24 of load beam element showing the downwardly projecting flange 70 and the single bend radii 78 and also showing an embossed or relieved section 140 which minimizes interference between the flexure tongue 60 which contacts beam element 16 at dimpled projection 62 as shown. Clearance is thus provided for the flexible arms 54 and 56 of the flexure piece 50. In addition to providing additional clearance for the flexure arms the relieved portion 140 also provides a certain amount of stiffening of the load beam element in the vicinity of the apex. The relief 140 can either be etched or formed in the load beam in order to provide for free motion of the arms. Figure 8 shows another variation of the embodiments illustrated generally in Figures 1 and 2. In Figure 8, apex end of the load beam is cut away along lines 160 to provide an additional lifting surface 161 beyond the slider. Relieved areas 140a in the load beam extension are also provided. Figure 9 is a side view of an assembly in accordance with Figure 8. In Figure 10 a preferred embodiment for the manufacture of the flexure piece is shown. The flexure piece 50 is etched with flexure side tabs 190 which attach to the body of the flexure between the aperture 52 which is bounded by the flexible arms 54 and 56 and the tooling hole 66. If the flexure piece 50 is formed using the side tabs located in the position shown in Figure 9, rather than utilizing end tabs projecting from the cross beam 58, there is less chance that the flexure piece will be damaged during the manufacturing process and a higher yield will result. In Figure 11 a slightly modified structure is shown showing a distal portion 24 of a load beam element 16 having wire capture 31 which have a necked in region 31a which are etched to facilitate the crimping of the wire captures for the wire tubing 26 and 28 during the assembly process.

Claims: wha is Claimed Is: 1. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element from a point displaced from the proximal end of the load beam element to a point displace from the distal end of the load beam element to form a stiffening flange only over a portion of the length of the distal end of the load beam element, the stiffening flanges projecting toward the side of the beam element to which the magnetic head is to be mounted; and (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms and having a dimpled load protuberance that contacts a point on the beam element adjacent to the distal end of the planar section. 2. The invention of claim 1 wherein the stiffening flanges on one or both side edges of the load beam have one or more fully or partially cut-away portions. 3. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element and which are oriented to project toward the side of the beam element to which the magnetic head is to be mounted, the stiffening flanges are projecting tabs which are bent with a first radius at the edge of the top surface to project toward the side of the beam element to which the magnetic head is to be mounted and bent around a second radius to form a lip on the stiffening flange which may be contacted with head lifting apparatus without damage to the stiffening flange or lifting apparatus; (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms. 4. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element and which are oriented to project toward the side of the beam element to which the magnetic head is to be mounted; (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms; and (c) a constraint member attached to the planar surface of the load beam element other than the surface to which the flexure portion is attached, said constraint member being attached the end of the beam element to which the flexure portion is attached and characterized by a main body having a width less than the width of the beam element at the apex. 5. The invention of claim 1 wherein a constraint member is also provided, said constraint member being attached to the planar surface of the load beam element other than the surface to which the flexure portion is attached, said constraint member being attached the end of the beam element to which the flexure portion is attached and characterized by a main body having a width less than the width of the beam element at the apex said constraint member also characterized by projecting sidetab means for facilitating the locating and centering of the constraint relative to the planar surface of the load beam element. 6. The invention of claim 1 wherein the width of the flexure piece is reduced over a substantial portion of its surface at least between the aperture and the point that it is joined to the load beam and wherein the stiffening rail extends along the load beam to a point adjacent to the reduced width area of the flexure means. 7. The invention of claim 4 wherein the constraint member is welded to the load beam element. 8. The invention of claim 5 wherein the constraint member is positioned to cover at least those portions of the planar surface of the load beam where there are no stiffening flanges. 9. The invention of claim 1 wherein one or more lengths of tubing are affixed to at least a portion of at least one edge of the planar surfaces of the load beam element to improve the damping characteristics of the suspension assembly. 10. The invention of claim 1 wherein the conductors for signals from the magnetic head mounted on the flexure portion of the suspension are enclosed within a length of tubing fixed to one edge of the planar surface of the load beam element and a similar tube which does not contain conductive wires is attached to the other side of the load beam element to balance the damping characteristics of the suspension assembly. 11. The assembly of claim 9 or claim 10 wherein the tubing is fixed to the edge of the load beam utilizing at least one tube capture tab formed as a projection from the stiffening flange which is constructed and arranged for crimping over the tubing. 12. The assembly of claim 11 wherein the tab has a necked portion at a selected point to thereby assure that the tab bends at that point to assure that predicatable crimping occurs during the manufacture of the assembly. 13. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element and which are oriented to project toward the side of the beam element to which the magnetic head is to be mounted, (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms; and wherein the planar surfaces of the load beam element in the vicinity of the flexure portion have relief channels embossed thereupon constructed and arranged so as to avoid interference between the load beam element and the flexible arms of the flexure portion for facilitating flexible gimballing of the slider by reducing the pitch and roll stiffness while maintaining dimple contact in the plane of the load beam surfaces. 14. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element and which are oriented to project toward the side of the beam element to which the magnetic head is to be mounted, the surface of the load beam in the vicinity of the distal end of the load beam has one or more cut away portions to reduce the the overall spring rate of the load beam (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms. 15. In a flexure for use in load beam suspension wherein the flexure means has an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece, said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms, the improvement wherein the flexure means is initially manufactured with projecting side tabs projecting outwardly from the flexible arms thereby to facilitate manufacture of the flexure means. 16. The invention of claim 1 wherein the distal end of the load beam is extended beyond the flexure to provide an extended lifter portion. 17. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element, the stiffening flanges are projecting tabs which are bent with a first radius at the edge of the top surface and bent around a second radius to form a lip on the stiffening flange which may be contacted with head lifting apparatus without damage to the stiffening flange or the lifting apparatus; (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms. 18. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element; (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms; and a constraint member attached to the planar surface of the load beam element other than the surface to which the flexure portion is attached, said constraint member being attached the end of the beam element to which the flexure portion is attached and characterized by a main body having a width less than the width of the beam element at the apex. 19. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element from a point displaced from the proximal end of the load beam element to a point displace from the distal end of the load beam element to form a stiffening flange only over a portion of the length of the load beam element, the stiffening flanges projecting toward the side of the beam element to which the magnetic head is to be mounted; (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms and having a dimpled load protuberance that contacts a point on the beam element adjacent to the distal end of the planar section; and wherein the conductors for signals from the magnetic head mounted on the flexure portion of the suspension are enclosed within a length of tubing fixed to one edge of the planar surface of the load beam element and a similar tube which does not contain conductive wires is attached to the other side of the load beam element to balance the damping characteristics of the suspension assembly. 20. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element, (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms; and wherein the planar surfaces of the load beam element in the vicinity of the flexure portion have relief channels embossed thereupon constructed and arranged so as to avoid interference between the load beam element and the flexible arms of the flexure portion for facilitating flexible gimballing of the slider by reducing the pitch and roll stiffness while maintaining dimple contact in the plane of the load beam surfaces. 21. A magnetic head suspension for attachment to a rigid arm, said head suspension comprising, in combination: (a) a spring load beam element joined to the arm at a proximal end thereof, said beam element being substantially resilient at its proximal end and substantially rigid for its remaining length, the beam including top and bottom substantially rigid planar surfaces and having stiffening flanges which project from edges of the top surface of the load beam element from a point displaced from the proximal end of the load beam element to a point displaced from the distal end of the load beam element to form a stiffening flange only over a portion of the length of the load beam element, the stiffening flanges projecting toward the side of the beam element to which the magnetic head is to be mounted; and (b) flexure means joined to the load beam element near the distal end thereof from a point on the planar surface proximally displaced from the distal apex of the element, the flexure means projecting beyond the distal apex of the element, the flexure portion having an aperture therein to define a pair of outer flexible arms generally parallel to the longitudinal axis of the assembly and a cross leg at the distal end of the flexure piece said flexure means also including a flexure tongue joined to the cross leg extending proximally from the cross leg into the aperture with its free end centrally located between the arms and having a planar protuberance contacting surface thereon constructed and arranged for contacting a protruberance on the beam element adjacent to the distal end of the planar section. 22. The invention of claim 1 wherein the outer flexible arms of the flexure are oriented perpendicular to the longitudinal axis of the assembly. 23. The invention of claim 1 wherein the beam element is joined to the arm with a swaged connection. 24. The invention of claim 1 wherein the beam element is joined to the arm with a bonded connection. 25. The invention of claim 1 wherein the beam element is joined to the arm with a welded connection.

Inventors: JURGENSON RYAN A, LIEN BRENT, PAYNE VALERIE J, WHEATLEY GREG, JURGENSON, RYAN, A., LIEN, BRENT, PAYNE, VALERIE, J., WHEATLEY, GREG
Applicants: HUTCHINSON TECHNOLOGY, HUTCHINSON TECHNOLOGY, INC.
Application year: 1991
Main classification: G11B21
IPC codes: G11B5, G11B21