Abstract: A perpendicular magnetic recording head comprising a pole formed of a highly permeable magnetic thin film facing at the end thereof the magnetic surface of a recording medium, a side member formed of a highly permeable magnetic material joined with the film surface of the pole, a nonmagnetic holder for holding the pole and the side member from the side surfaces, the nonmagnetic holder having coil hole, and an exciter coil wound around the pole and the side member through the coil hole, characterized in that the coil hole is gradually increasing in width from the end of the side member toward the rear.
Abstract: A magnetic disk unit wherein a plurality of magnetic recording disks are mounted at predetermined intervals on a rotatably supported spindle via a magnetic recording disk mounting member having air ventilating holes which extend from the upper and lower portions thereof near the spindle to the spaces between the magnetic disks, air being circulated by the centrifugal force generated by rotation of the magnetic recording disks.
Abstract: A magnetic tape cassette comprises at least one reference hole formed in either of upper and lower casings so as not to prevent the running of a magnetic tape, at least one reference boss formed in the other one of the casings in alignment with the reference hole to be closely fitted thereto, and guide supporting members for holding guide members positioned at a given distance from the reference hole and the reference boss.
Abstract: A method for manufacturing a tape drive member is provided which comprises forming a shaft from an alloy of a soft metal material and a hard metal material, subjecting part of the shaft to sand blasting for roughening, and chemically treating the roughened surface in a solution which is capable of dissolving the soft metal material. A tape drive member manufactured by this method is also provided.
Abstract: A magnetic recording medium and a process for producing it is disclosed. The medium is comprised of a non-magnetic flexible support base and a magnetic layer formed on a surface of the support base. The magnetic layer is preferably in the form of a thin, ferromagnetic metal film formed by vapor deposition. An overcoat layer of a fluorine-containing organic material is formed directly on the magnetic layer. The fluorine content of the overcoat layer continuously and gradually decreases in the direction toward the magnetic layer. Accordingly, high fluorine content near the surface of the overcoat layer provides improved smoothness near the surface whereas the lower fluorine content near the interface of the overcoat with the magnetic layer allows for strong adhesion between the overcoat and the underlying magnetic layer substrate.
Abstract: A perpendicular magnetic recording and reproducing head, including: a spiral coil of at least one electrically conductive thin film; and a main pole of a first thin magnetic film having an end for recording and reproducing information, the main pole and the spiral coil being electromagnetically coupled to each other. A perpendicular magnetic head such as this can be easily manufactured, can be adapted not only to floppy disks but also to rigid disks, is suitable for high-frequency operation, and has an improved recording/reproducing efficiency.
Abstract: A flexible magnetic disc cassette contains a flexible magnetic disc which is driven by a shaft associated with a driving device. The disc is contained within a cover having an upper half and lower half. An anti-wearing member is attached on an inner surface of the upper half of the cover for abutment with the driving device shaft so as to correct warpage of the upper half of the cover.
Abstract: A magnetic disc type memory device swinging actuator is constituted by a plurality of a driving assemblies juxtaposed on a stationary shaft and extending in the opposite direction. Each driving assembly include a head arm, a magnetic head mounted on one end of the head arm, a coil supporting member for supporting a flat coil and extending in the opposite direction to the head arm, and first and second permanent magnets spaced from the coil in an axial direction of the shaft and also spaced in a direction of arrangement of the flat coil. The first and second permanent magnets are magnetized in the axial direction of the shaft so that poles of opposite polarities confront the flat coil. The first and second permanent magnets are mounted on a common yoke and the flat coils are disposed in a closed magnetic flux path including the first and second permanent magnets and the yokes.
July 20, 1982
Date of Patent:
October 1, 1985
Nippon Telegraph & Telephone Public Corporation
Abstract: A swing arm arrangement moves and positions a magnetic head over a surface of a rigid rotatable magnetic disc of a magnetic disc store. The arrangement includes a swing arm, a permanent magnetic stator having stator end plates, and a bearing arrangement having ball bearings. The swing arm, magnetic stator and ball bearings are mounted on a bearing pin. The bearings are arranged on the pin at opposite sides of the arm and are carried by the stator end plates.
Abstract: A mode changing mechanism for a recording and/or reproducing apparatus, such as, a cassette tape player, includes a gear driven by a motor and having a driving lug projecting from the gear for movement in a circular path therewith, a mode changing element which is movable from a first position corresponding to one mode of the player, for example, its stop mode, through second and third positions, in turn, to a fourth position corresponding to another mode of the player, for example, the reproducing mode thereof, a manually actuable mode selecting button movable from an inoperative position to an operative position for displacing the mode changing element from its first position to the second position where a pawl on the mode changing element is engageable by the driving lug for using the power of the motor in driving the mode changing element to its third position, and a spring effective when the mode changing element attains its third position to bias the mode changing element to its fourth position in which
Abstract: A flexible hub for a disk is described. The disk includes a relatively large center hole into which a flexible planar member is mounted or clamped. The size of the flexible member is slightly larger than the hole, thereby requiring that the flexible member be slightly bowed or flexed in order for it to fit within the hole. The flexible member is preferably attached to the disk at three respective equi-angularly spaced locations around the periphery of the hole. In the center of the flexible member is a collar adapted to receive a protruding spindle neck from a spindle mechanism upon which the disk is mounted. The end of the spindle neck and the inside wall of the collar are tapered at the same angle. Insertion of the spindle neck into the collar thereby forces alignment or centering of the center of the collar with the longitudinal axis of the spindle neck.
May 31, 1983
Date of Patent:
September 17, 1985
Storage Technology Partners II
Richard A. Wilkinson, Jr., William C. Hunt, David W. Rickert
Abstract: A control mechanism for floppy disk drive units. A single control rod having cam lobes is mounted with an operating end extending through the front bezel of the unit. The control rod has a lobe cooperating with surfaces to establish positive loaded and unloaded positions of the driving cone and spindle of the unit. The driving cone is carried from an arm having an actuating spring cooperating with a lobe of the control rod. The actuating spring has angular detent parts whereby the control rod moves with a snap action between loaded and unloaded positions of the cone. The control rod has a further cam lobe carrying a pressure pad which comes into contact with the diskette in the loaded position along with an arm dropped or loaded with the head.
Abstract: A tape pack guide mechanism, wherein a guide arm is so disposed that its extremity can pivot in the vertical direction around a pivot axle mounted at the back part of a tape player; wherein the extremity of the guide arm is connected to a pack guide which moves up and down; wherein this guide arm supports at least one stick shaped thrust piece, an extremity of which extends into the pack guide, whereby this thrust piece is so designed that, when the pack guide goes downwardly, it pushes on an upper side of a pack in the pack guide and, when the pack guide goes upwardly, it thrusts the pack guide against stoppers disposed adjacent a housing opening for introducing the tape pack.
Abstract: A disk drive assembly having a shallow or low profile construction. The assembly includes a drive spindle and drive cone for the diskette. The drive cone is mounted directly from a part of the frame or chassis of the assembly. The drive spindle is cylindrical having a bottom which is dished or raised upwardly providing a bottom recess. The bushing which contains the journal bearings for the spindle shaft extends into the recess so that overall dimension of the assembly is minimized.
Abstract: In a cassette tape recorder, a base is of a rectangular shape having a transverse length substantially equal to the longitudinal length of a cassette to be inserted. A pair of side walls are attached to opposite longitudinal side edges of the base to face each other, a capstan is located at the transverse center of the base, and a flywheel has a diameter substantially equal to the transverse length of the base. A head lever and a pinch roller lever are elongate and are arranged on the base along the transverse direction thereof and near the capstan. A cassette holder is located between the side walls, on the capstan side of the head lever, so that a substantial part of the holder overlies the flywheel. A solenoid device is mounted on the base on the opposite side of the head lever to the capstan, so that a plunger of the solenoid device may move along the longitudinal direction of the base.
Abstract: In an apparatus for recording and/or reproducing signals on a flexible disc which is rotatably mounted in a jacket having an indicator for indicating the number of tracks on which the signals have already been recorded, a transducer records and/or reproduces the signals on a surface of the disc so as to form a plurality of circular tracks thereon. The transducer is subsequently moved in the radial direction of the disc to the next adjacent track. The apparatus is further provided with an indicator driving mechanism for driving the indicator of the jacket to shift the latter to a corresponding position as related to the number of the recorded tracks. The indicator driving mechanism is driven in synchronism with the movement of the transducer.
Abstract: A tape cassette incorporates an anti-static member that dissipates static electricity on the tape as it runs. The anti-static member comprises an electrically conductive strip that flexibly engages the edges of the coils of tape wound on reels inside the cassette housing. A tab integral with the strip extends into a locating hole of the cassette housing for engagement with a conductive locating pin on the apparatus using the cassette when the cassette is installed. The tab provides a grounding means that completes the connection of the tape to ground and prevents the build-up of static electricity on the tape as it rubs itself and the cassette guiding elements while it is running.
Abstract: A tape player is provided which has a tape player set and an operation board mounted on the front face of the tape player set. The tape player is particularly characterized in that a tape pack insertion aperture which is formed in a part of said operation board is closed or opened by a cover which is rotatable about a rod fixed on the front face of said operation board.
Abstract: A read/write head for reading and writing data on a magnetic card or ticket with drive means for driving the ticket back and forth in opposite directions past the head includes a ticket pressure biasing unit in the form of a pair of brushes disposed adjacent head and inclined slightly toward one another in a direction toward the head for applying a uniform pressure on a ticket moving past the head in either direction of the ticket.