Abstract: A recording and reproducing disc driving apparatus has a main base which has seat portions for supporting a head, a carriage, first and second motors and a sensor and has at least one cut portion, and a sub-base for fixedly mounting the main base and having a dimension of the top surface which is the same as that of a given rectangular configuration of the driving apparatus. The at least one cut portion is formed by cutting a portion of the main base which does not contribute to support structual elements such as motors so that the top surface of the main base is smaller than that of the given rectangular configuration of the apparatus.

Abstract: A microminimonolithic magnetic head slider adapted for use with a magnetic head flying on an air cushion over a magnetic media for recording and reproducing tracks of information is shown. The slider includes an aerodynamic surface which has a pair of spaced, parallel load rails which are adapted to fly over the moving magnetic media. The load rails have an air bearing surface formed thereon, and each air bearing surface has a width which is greater than a track width of information on the magnetic media. Also, the aerodynamic surface has, located between the pair of spaced, parallel load rails, a wedged-shaped central rail having an apex which defines an air bearing surface having a width which is less than the width of the air bearing surface on the load rails. The slider includes a transverse slot which is spaced from and extends substantially perpendicular to the pair of spaced, parallel load rails and the central rail and a pair of spaced, vertically extending slots.

Abstract: A baffle assembly comprises a series of parallel baffle plates positioned adjacent to and coplanar with the respective disks mounted on a spindle of a disk drive. The baffle plates help maintain parallel air flow across each disk edge thereby reducing turbulence at the disk edge. This reduces the vertical vibratory motion of the positioning arm holding the transducer head slider suspension assembly which in turn reduces the horizontal or cross-track motion of the head.

Abstract: Magnetic head suspension assemblies are improved by adhesively bonding a flexible circuit to a suspension. Damping is provided as well as a reduction in height.

Abstract: A spacer for separating disks in a disk drive having a plurality of superposed disks surrounding a hub comprising a sheet material ring channel-shaped in cross section having radial and circumferentially spaced apertures for providing transverse fluid communication through the spacer.

Abstract: Magneto-resistive head comprising a magneto-resistive film, and a soft magnetic film disposed at one side of said magneto-resistive film, which soft magnetic film is magnetized by electric current flowing through the magneto-resistive film, to which a bias magnetic field is applied by the magnetization of the soft magnetic film, whereby they are so structured that 0.7.times.B.sub.SMR .times.T.sub.MR <B.sub.SSF .times.T.sub.SF is satisfied, where T.sub.MR and B.sub.SMR represent the thickness and the saturated magnetic flux density, respectively, of the magneto-resistive film and T.sub.SF and B.sub.SSF represent the thickness and the saturated magnetic flux density, respectively, of the soft magnetic film.

Abstract: The device comprises a case, insertable into the cassette receiving compartment of an apparatus to be cleaned and having a pair of spools rotatably mounted therein. The spools are adapted to be driven by the cassette drive mechanism of the apparatus to be cleaned and have a web wound thereon. The device further comprises an aerosol type container containing cleaning fluid, being located in said case and adapted for being automatically actuated by actuating elements upon introduction into a cassette receiving compartment. Fluid distribution members being provided to distribute fluid displaced from the container onto the web.

Abstract: A rotary magnetic head device for use with a magnetic recording an/or reproducing apparatus, such as a digital audio tape recorder (DAT) or a video tape recorder (VTR), includes a chassis, a fixed shaft secured to the chassis and a drum unit consisting of an upper drum fixed to the upper end of the fixed shaft and a lower rotary drum rotatably mounted by means of a bearing device on the fixed shaft between the upper drum and the chassis. A rotary transformer consisting of an upper fixed core and a lower rotary core is disposed in a recess formed in the lower side of the fixed upper core. The lower core is attached to the lower rotary drum and carries a head attachment plate carrying in turn a magnetic head. The magnetic tape is wrapped about the drum unit over a prescribed wrapping angle. As the lower drum is rotated by an associated driving device, signals may be recorded on or reproduced from the magnetic tape by the magnetic head kept in frictional contact with the running tape.

Abstract: A flexible disk cassette is provided and includes improved structure for stabilizing flutter of the disk upon rotation of the latter within the cassette, particularly at the access slot where the disk may be coupled to read/write heads for data recording or reproduction. The cassette includes a flexible data storage disk coated on both sides with a data storage recording medium and a pair of cleaning liners each positioned on a respective side of and in selective contact with the disk. The disk, sandwiched between the liners, is positioned in the cassette between a pair of spaced-apart covers bonded to one another. Respective radially extending access slots are provided in the covers to provide access of the read/write heads to the data storage medium on the disk. Positioned adjacent each radial edge of the access slot and facing the respective liner is a flat-surfaced, raised portion or land.

Abstract: In a magnetic tape cassette having a housing and a cover mounted thereon, contaminants are prevented from passing into the housing interior at the point where the cover is mounted on the cassette, and thereby prevented from reaching the magnetic tape mounted in the interior of the housing. This is attained by partitioning an interior of the housing adjacent a wall portion thereof, into an outer contaminant-receiving compartment at which the cover is pivotally mounted, and an inner tape-receiving compartment. The partition prevents any communication between these two respective compartments.

Abstract: Disclosed is a file memory unit having a casing for accommodating a head positioning mechanism and a magnetic recording disk virtually in sealed manner, and a frame for supporting the casing resiliently. The unit has the provision of a shock absorbing facility for absorbing the vibration created by the head positioning mechanism and the vibration and impact applied from the outside. The shock absorbing facility has a unitary structure having a first spring constant for absorbing relatively small vibration created by the casing, a second spring constant for absorbing the vibration applied from the outside, and a third spring constant for absorbing the impact applied from the outside.

Abstract: An improved liner material for wiping debris from recording media to eliminate errors in the transmission of information with respect to the recording media. The liner material is a fibrous web which has fibrous surfaces and void volumes therein, the improvement being that the liner has at least one surface, with a fretting area of free vibratable fibers of at least 10% of the total surface, in contact with a surface of the recording media, and when vibrated against the recording media, and in contact with debris thereon, the free vibratable fibers impart energy to the debris causing the debris to move into the void volume of the liner, thus removing the debris from the recording media. The removal of debris from the recording media results in the error-free transfer of information from a recording transducer to and from a recording target media.

Abstract: A main pole exciting type magnetic head for vertical magnetic recording, including a lower slider formed of a magnetic material, a winding core formed of a magnetic material, a substrate formed of a non-magnetic material and disposed so that one end face thereof is positioned on an upper surface of the winding core, a main pole film formed on one end face of the substrate, and an upper slider formed of a magnetic material, the upper slider being opposed to the lower slider through a vertical magnetic recording medium; as well as a method of producing such magnetic head.

Abstract: An early end of tape sensing subsystem for a data processing system, including a host computer, a cache buffer, and a magnetic tape drive subsystem utilizes outputs dependent upon the movement of a capstan wheel, swing arm, and file reel of the magnetic tape drive subsystem, determining the net movement of tape therein in order to measure the circumference of the file reel plus tape thereon. Whenever a series of valid readings from a conventional sensor are obtained indicating that the circumference of the file reel plus tape is approaching that of the circumference of the file reel itself (i.e., no tape on the file reel), a signal is sent to the microprocessor controlling the cache buffer, said signal indicating that the end of the tape is approaching.

Abstract: A cassette cleaner adapted to be positioned in a cassette receiving recess of a video player/recorder. A cleaning ribbon is mounted in the cassette cleaner, and guide members of the video player/recorder carry the cleaning ribbon outwardly into cleaning engagement with the rotating head of the player/recorder. The cassette cleaner has a stationary locating element which restrains outward movement of a portion of the ribbon so that the ribbon engages the peripheral surface of the rotating drum that carries the head member along two contact locations of relatively short arcuate length. This reduces the frictional engagement of the ribbon relative to the rotating drum.

Abstract: An automatic stopping mechanism for a tape feeding device which can detect an end of a tape to operate while the tape feeding device is in any of reproducing, recording, fast feeding and rewinding modes. In any operation mode, a driving route from a motor to a reel receiver is effective to tend to continuously rotate the reel receiver. Upon stopping of the reel receiver by an end of a tape, a rockable member is rocked to and remains at a position at which rotation of an cam disk interposed in the driving route is stopped by the rockable member and then a releasing member on which the cam disk is mounted is pivoted to move the cam disk out of the driving route, thereby stopping rotation of the reel receiver.

Abstract: Disclosed is a recording and/or reproducing apparatus which comprises heads of at least two different kinds, carrying apparatus operative for receiving a recording medium, discriminating apparatus for discriminating the kind of the recording medium being carried by the carrying apparatus, selecting apparatus for selecting one kind of heads out of the different kinds in response to the discriminating apparatus and control apparatus which is provided for at least one kind of head selected out of the heads of different kinds to control contact of the head with the recording medium in response to the selecting apparatus.

Abstract: A light-emitting element and light-receiving elements are embedded upright in a single printed wiring board for cooperating with one another in detecting the leader tape portion of a magnetic tape. Such a printed wiring board is fixed to a chassis by means of which a magnetic tape cassette is held in position. This arrangement enables a reduction in the number of leads and connectors, and hence greatly decreases the number of connections to the body of a magnetic recording and reproducing apparatus, thereby improving its adaptability with respect to automated assembly.

Abstract: A Winchester disc spindle construction provides a spindle motor coil wound around laminated formed annular plates and having lead wires extending through a central stationary shaft. Surrounding a spindle coil is a cylinder having a pocket for arcuate permanent magnets. The discs are fixed to and rotated by the cylinder. Relatively large bearings support the cylinder concentric with the shaft and give increased strength to the structure, permitting more discs to be supported in equivalent space, as compared with prior structures. The arms carrying the read-write heads are mounted on a stack of spaced-apart arms pivotted at a distance from the discs so that the heads move along a shallow arc to reduce skewing of the heads relative to the recording tracks of the discs.

Abstract: A disk driving device which can be reduced in production cost and in overall thickness and can prevent a circuit board from being damaged upon ejection of a disk cartridge therefrom. The disk driving device comprises a spindle shaft mounted for rotation relative to a base by means of a metal bearing, a spindle fitted at an end of the spindle shaft remote from the base and having carried thereon a turntable for receiving a disk for integral rotation, a stator yoke secured to the base, and a buffer member mounted on a face of a driving magnet opposing to a circuit board mounted on the base. The driving magnet secured to the spindle for electromagnetically cooperating with a driving coil secured to the circuit board to rotate the spindle is located between the circuit board and the stator yoke.