Abstract: A spin valve sensor is provided with a spacer layer sandwiched between a free layer and a pinned layer. The pinned layer is pinned by a pinning layer constructed of a material having a high coercivity, and a low magnetic moment. The high coercivity is employed for pinning the pinned layer, and the low moment assures that stray fields from the pinning layer do not affect the coercivity of the free layer. The magnetic moment is preferably less than 300 emu/cc and the coercivity is preferably greater than 500 Oe. The magnetic orientation of the pinning layer is set by a magnetic field at room temperature that may be applied at the suspension level. The materials with which the pinning layer may be formed are amorphous materials TbFeCo and CoSm, and a non-amorphous material CoPtCr, provided the Cr is of sufficient proportion to minimize the moment of the CoPtCr material.

Abstract: A method of manufacturing a small, light, highly accurate and inexpensive thin film sensor element is disclosed. The thin film sensor element comprises a sensor holding substrate having an opening part and a multilayer film structure adhered thereon. The multilayer film structure comprises a first electrode film, a second electrode film, and a piezoelectric dielectric oxide film present between the first and second electrode films. The method of manufacturing the thin film sensor element comprises the steps of: forming the multilayer film structure by forming the first electrode film having a (100) plane orientation on a surface of an alkali halide substrate, forming the piezoelectric dielectric oxide thereon, and forming the second electrode film on the piezoelectric dielectric oxide; adhering the multilayer film structure on the surface of the sensor holding substrate having the opening part; and dissolving and removing the alkali halide substrate with water.

Abstract: A low-temperature sinterable dielectric composition with a high dielectric constant wherein x=2-4 mol %, y=0.5-3.0 mol % and z=3-5 mol % in [95PMN-5PT]-x(PbO)-y(CaO)-z(CuO).

Abstract: A device for mounting the shaft to the rotor of an electric motor, comprising the steps of: positioning a cylinder block (3) and a rotor (7) relative to each other with a predetermined axial spacing therebetween and with the axes of a bearing bore of the cylinder block (3) and of a central bore of rotor (7) being aligned to each other inside a hermetic chamber (10) having an atmosphere inert at pressures higher than the atmospheric pressure; introducing a shaft (5) which has been diametrically contracted by refrigeration in the hermetic clamber (10) through both the bearing bore and the central bore of the rotor (7); maintaining the shaft (5)-cylinder block (3)-rotor (7) assembly inside the hermetic chamber (10) immobilized until the diametrical thermal dilatation of the shaft (5) causes said shaft to be secured to the wall of the central bore of rotor (7) and until a thermal balance between the parts has been achieved.

Abstract: A method for assembling a magnetic disk drive with a relaying flexible printed circuit sheet and an actuator includes shaping at least one metal bump to form a first terminal on the relaying flexible printed circuit sheet. The shape of the metal bump determines the amount of solder that will adhere to the metal bump. This amount must be adequate to form an efficient electrical and mechanical connection between the first terminal and a second terminal on the actuator. The next step is laying solder on the metal bump so that the adequate amount of solder remains on the metal bump and forms a solder layer. After the solder layer is formed on the metal bump, the first terminal is placed on the second terminal so that the solder is squeezed between the first and second terminals.

Abstract: A slider incorporates welding studs for assembly with a spring arm. Each of the welding studs includes a base that is integral with the slider. The base has a controlled height and is made from a first material. Each of the welding studs further includes a meltable stud member which is placed on the base. The meltable stud member is made from a second material that has a melting point which is lower than that of the first material of the base.

Abstract: A method of making and self-aligning a disk data storage read/write head that uses a catadioptric focusing device (or lens) having a high numerical aperture (NA), which does not introduce significant spot aberration on a storage medium. The manufacturing process of the head is carried out at a wafer level, and is facilitated significantly by the flatness of the focusing device. An exemplary manufacturing process is implemented as follows: A lens coil/plate is formed by molding a flat optical substrate to form the desired lens shapes. Coil cavities or depressions are formed simultaneously with the lens to accommodate a coil. Conductive plugs are formed in proximity to cutting lines for wire bonding attachment to the coil. A slider wafer is formed and bonded to the lens/coil wafer. Coils and pedestals are also formed on the lens/coil plate using thin-film processing techniques, and reflective surfaces are deposited on the bottom surface of the substrate, opposite the lens.

Abstract: A method for manufacturing a magnetic head which includes the steps of overlaying a resist sheet which is provided with an organic resist film on a supporting body on the air bearing surface of the magnetic head; transferring the organic resist film on to the air bearing surface and then removing the supporting body from the organic resist film; through a patterning process partially removing the organic resist film to achieve the pattern required for machining; and performing machining on the air bearing surface via gaps in the organic resist film and then removing the resist film.

Abstract: A method for fabricating a dual element head is disclosed. One embodiment includes first depositing a first head element upon a substrate and second depositing a second head element upon the first head element. Each of the depositing steps includes a tolerance that is independent of the other. In the second depositing step, the functional width of the second head element (i.e., the write width if the second head element is a write element) is made wider than a desired functional width for the second head element. The second head element is then trimmed to substantially achieve the desired functional width while using a portion of the first head element as a reference to reduce errors associated with the independent nature of the first and second tolerances. For instance, the portion of the first head element used as a reference can be an edge of a magnetoresistive (MR) read element that defines the read width of the read element.

Abstract: A method for reducing the movement of a rotor cage relative to a rotor core in a rotor assembly, such as found in a squirrel cage AC induction motor. Movement is reduced by forming a depression in a portion of a rotor bar of the rotor cage. Formation of the depression displaces rotor bar material adjacent to the depression. The displacement of rotor bar material deforms an adjacent portion of the rotor core thereby fixing the rotor cage to the rotor core. The reduction in movement between the rotor cage and the rotor core is dependent on various depression geometries, quantities and positions. The invention further includes a rotor assembly with a substantially cylindrical rotor core having longitudinally extending slots on its outer surface. A rotor bar is positioned in at least one of the slots.

Abstract: Stator coil lead wires are coursed along complex, circuitous paths on the end of a stator core and trimmed at a precise predetermined distance from the stator core. Improved end effector wire-guiding tooling members are provided in place of conventional gripper jaws to permit the lead wires to be coursed along complex, circuitous paths. In addition, an improved lead pull assembly, improved temporary wire clamps, and a wire former assembly are provided.

Abstract: In a method of making a pencil core having a plurality of substantially flat laminations wherein at least one lamination at the center of the core is wider than the other laminations, a flat strip of core steel is fed into a progressive die, and a plurality of scrap region blanking stations is provided each of which blank out two spaced parallel regions from the strip, but with each of the scrap region blanking stations blanking out the regions at a different spacing. At an embossing station, at least one embossment is provided in at least each of the laminations preceding the last lamination.

Abstract: A dynamoelectric machine constructed for speed and accuracy of manufacturing has a stator core constructed of 90.degree. symmetrical stator laminations and the windings have differing numbers of poles which overlap in slots of the stator core are wound of the core formed by the laminations in unique fashion. The rotor bars of the machine are skewed to optimize performance of the machine when in the form of a single phase induction motor. Magnet wire leads of the windings are connected directly to terminals on a plug and terminal assembly which is formed for positive location on an end frame of the machine without welding or other fastening to the end frame. The end frames of the machine and stator laminations forming the stator core are formed so as to increase the precision of the final position of the stator relative to the rotor assembly of the dynamoelectric machine. The end frames are constructed for grounding without the use of fasteners or wire.

Abstract: A method for manufacturing a magnetic head core of a complex magnetic head includes binding a first core material of a U-shaped cross section and a second core material of a flat plate shape to form a tubular core material having two bonded portions between the first and second core materials. Then a plurality of grooves are formed in the tubular core material across one of the bonded portions to form a plurality of track surfaces. The grooves are then filled with a fused glass material, and the other of the bonded portions is removed to form a substantially U-shaped core block having a plurality of track surfaces separated by the glass-filled grooves. The U-shaped core block is then sliced along each of the grooves to obtain a plurality of magnetic head cores. A complex magnetic head manufactured by the method is also disclosed.

Abstract: An improved composite ultrasonic transducer, and elements therefor, which may be made autoclavable, and a method of making these elements. A number of planar precursors comprising strips of piezoelectric ceramic material separated from one another by a polymer material are stacked one above another with the ceramic strips aligned with one another, and with electrical conductors disposed between each of the planar precursors. These precursors are then bonded to one another, to form a bonded assembly. The bonded assembly is then slit along parallel lines perpendicular to the direction of elongation of the ceramic strips, subdividing the strips into individual ceramic members and also subdividing the planar conductors, forming ribbon-like conductors extending between opposite sides of the array. The saw kerfs are filled with a hardening polymer material. The ribbon-like conductors reaching the edges of the assembly are then connected electrically in parallel, reducing the capacitance of the individual emitters.

Abstract: In a method for forming a horizontal head slider having a media opposing surface flying above or coming into contact with a recording medium, a film-like surface of a head for recording/reproducing information provided in parallel to the media opposing surface, and a rail portion provided on the media opposing surface for generating a pressure for ensuring stable flying or contact. The rail portion has a planar portion and a taper portion, and all of the shaping accuracy of the bottom surface of the slider and the rail, the adhesive property to a sacrificial layer overlaid thereon and the surface smoothness of the rail surface are enhanced. When the rail portion is formed, a part of mold for the planar portion is prepared by a metallic layer 2 and a mold for the taper portion is prepared by a photoresist layer 3, and a sacrificial layer 4, a media opposing surface layer 6 and a slider body layer 6 are formed thereon in this order.

Abstract: A head/slider assembly is integrated with a track-following electrostatic micro actuator. A method for fabricating the head/slider assembly includes the steps of: forming a micro actuator structural layer on a slider substrate with a cavity formed therebetween; forming metal signal lines on the micro actuator structure layer; forming the read/write magnetic head on a central part of the micro actuator structure layer; etching to separate the micro actuator and the read/write magnetic head; and forming a protective cover on top of the micro actuator and the read/write magnetic head to form the head/slider assembly, to thereby make the assembly to allow it to be used in a HDD system of a very high track density having a track pitch of 1 .mu.m and a recording density of more than 10 Gb/in.sup.2.

Abstract: The high resistance lead layers of a read head extend straight back into the head from each of the first and second edges of the read sensor. This lessens the length of each of the high resistance lead layers so that they do not have to be made thicker to satisfy resistance requirements. Accordingly, a lateral width of each high resistance lead portion along the ABS and a thickness thereof are chosen so as to minimize the thickness while yet satisfying the resistance requirements. Further, a method of making the first and second lead layers is provided that minimizes the thickness of the high resistance lead layers. Instead of constructing the high resistance lead layers first, the present method constructs the high resistance lead layers last so that the high resistance lead layers are not altered by subsequent processing steps.

Abstract: A gripping tool for gripping a suspension assembly component of a disc drive includes a first planar gripping member connected to a second planar gripping member. The first and second planar gripping members each have respective first and second gripping surfaces that share common respective edges with respective first and second non-gripping surfaces. The first and second non-gripping surfaces having larger surface areas than the first and second gripping surfaces, respectively.

Abstract: A piezoelectric ceramic-polymer composite is made of a substantially two-dimensional polymer matrix and a monolayer of sintered piezoelectric ceramic granules dispersed throughout the matrix so that each granule has an upper portion protruding from one side of the matrix and a lower portion protruding from the opposite side of the matrix. The composite is formed by partially embedding a monolayer of sintered piezoelectric ceramic granules in a pliable material, then partially covering the granules with a polymer resin, curing the resin to form a matrix and removing the pliable material. A transducer is formed by flattening the upper and lower portions of the granules to form coplanar top and bottom surfaces parallel to, but not coplanar with the surface of the matrix, then electroding the granule surfaces, attaching top and bottom cover plates, and sealing the transducer around the edges.