Abstract: A driving device for a tape recorder wherein means is provided for transmitting power from a motor to a capstan shaft which rotates unitarily with a flywheel, a rocking bracket is turnably mounted on an outer periphery of the capstan shaft, the rocking bracket is equipped with two transmission rollers which are rotatable on their respective axes, a belt is extended over the two transmission rollers, an outside surface of the belt is laid on a pulley which is fixed to the capstan shaft, a pair of reel shafts for taking up and rewinding a tape are disposed in a position where either of the two transmission rollers impinges on the reel shaft when the rocking bracket has turned, and the transmission rollers are provided with means for transmitting power to the reel shafts.

Abstract: A head positioning device for a disk drive unit comprises a Y-shaped drive band for displacing the carriage bearing the head(s), each divergent arm portion of the Y forming the same angle with the central longitudinal axis of the band. In another embodiment, the two divergent arm portions are connected together by a crosspiece. Advantageously, the drive band is made of steel having a tensile strength of from 1200 to 2500 N/mm.sup.2, especially from 2000 to 2500 N/mm.sup.2. The novel positioning device can be used with advantage in any type of system for recording, reproducing and storing audio, video, data or control signals.

Abstract: This invention relates to a rotary head assembly in which a magnetic tape runs while being would helically, consisting of a fixed cylinder 21 having a fixed cylindrical part, and a rotatable rotary member 19 having a diameter approximately equal to that of said fixed cylinder 21, being disposed coaxially with a very small gap and holding a magnetic head 29, wherein pump-out type spiral grooves 20 are provided either partly or wholly on either plane of the confronting planes formed in the relative rotating part between said fixed cylinder 21 and said rotary member 19 in order to create a buoyancy on a running magnetic tape by air pressure not only in the rotary cylinder area but also in the fixed cylinder area, to realize a stable and smooth tape running, and to radically eliminate the tape chirping phenomenon, sticking phenomenon, and tape damage and cylinder wear accompanying sliding.

Abstract: In a magnetic disk memory, a magnetic disk is driven by a DC motor having a permanent magnet rotor and a pair of stator windings sharing a common ground connection point. The windings are alternately energized from an electrical power source by a switching circuit which produces positive voltage pulses of predetermined duration across the windings. The negative emf induced in the windings between energizing pulses provides a source of regulated, negative DC voltage which may be used to power various components requiring such a supply.

Abstract: An improved magnetoresistive transducer for sensing the magnetic fields recorded on a magnetic medium and suitable for fabrication using photolithographic techniques. The transducer has two separate metallization layers so that the bias conductor may be deposited opposite the magnetoresistive sense element without any electrical connection between the two, thereby allowing the sense currents and bias currents to each be independently optimized and allowing the same bias current to be used to bias each magnetoresistive transducer element in an array. The bias conductor is set back from the edge of the magnetoresistive transducer element which is closest to the magnetic medium, providing a number of advantages related to wear, to decreasing the possibility of a short circuit between the bias conductor and the transducer element, and to reducing the exposure of the bias conductor to environmental hazards.

Abstract: A signal detection operating lever device comprises a first base plate, a second base plate parallel to the first base plate, a first operating lever between the base plates movable between a first position in which signal generator stops generating signal to stop running of a recording tape and a second position in which the signal generator generates the signal to determine a recording tape transport mode in the tape recorder, a second operating lever having a magnetic head and disposed between the base plates to move the magnetic head between a first position in which the head is separated from a tape and a second position in which the head comes in contact with the tape, an accidental erasure preventive lever movable between a first position in which the second operating lever is prohibited to move from the first position to the second position thereof, and a second position in which the second operating lever is allowed to move from the first position to the second position thereof, a third operating lev

Abstract: A flexible magnetic disk comprises a jacket and a flexible magnetic disk sheet housed in the jacket. The flexible magnetic disk is provided at the center with a circular hole for engagement with a sheet positioning member of an information writing and read-out apparatus. The jacket has an aperture for exposing the circular hole of the flexible magnetic disk sheet. The peripheral edge portion of the circular hole which comes into contact with the sheet positioning member is provided with at least one lubricant layer to decrease the coefficient of friction of the peripheral edge portion to 0.45 or less, so that the flexible magnetic disk sheet is correctly positioned by the sheet positioning member.

Abstract: A magnetic tape loading device comprises a head drum having magnetic heads, a drum base supporting the head drum, two loading rings supported on an upper surface of a chassis and rotatable in opposite directions, two tape guide blocks having guide posts for pulling out a magnetic tape from a tape cassette and winding it on the head drum, and guide block guide members for guiding the block. The loading rings are vertically spaced in coaxial relation at the outside of the drum base.

Abstract: A magnetic head characterized in that a nonmagnetic material of an erasing core chip in which two erasing cores are coupled by the nonmagnetic material is provided with a groove portion and that a recording/reproducing core is inserted in the groove portion. The magnetic head can be fabricated by a method characterized by comprising the step of providing first and second orthogonal grooves in a face plate, the step of providing the groove portion in the nonmagnetic material of the erasing core chip, the step of inserting the recording/reproducing core in the first groove, inserting the erasing core chip in the second groove and inserting the recording/reproducing core in the groove portion of the nonmagnetic material, and the step of fixing the face plate, the recording/reproducing core and the erasing core chip with glass or the like and polishing a front surface of the face plate.

Abstract: A device is disclosed for cleaning the magnetic head of a recorder/reproducer apparatus having a cartridge compartment into which a tape cartridge is slid for data transfer contact with the magnetic head. The head cleaner device has a casing of approximately the same shape and size as the tape cartridge, which casing is to be slid into and out of the cartridge compartment. The casing has pivotally mounted therein a handlebar having one end projecting therefrom through an aperture in the casing. Removably mounted to the other end of the handlebar, also exposed through another aperture in the casing, is a cleaner body of a plastic foam or like material which is to be pressed against the magnetic head upon full insertion of the cleaner casing in the cartridge compartment. The user may grip the projecting end of the handlebar and move the same back and forth about its pivot for cleaning the magnetic head by the cleaner body on the other end of the handlebar.

Abstract: A magnetic head assembly comprising a read/write head unit adapted for reading and writing data and provided with a magnetic core 1 having a thin sheet of an Mn-Zn ferrite. The magnetic head assembly also has erase head units bonded to the read/write head unit and adapted to erase the edges of the data, each of the erase head units being provided with a magnetic core 2 having a thin sheet of an Ni-Zn ferrite. The read/write head unit and erase head units are bonded by means of a glass 6.

Abstract: A miniature type tape cassette comprises a cassette case smaller than a standard type tape cassette, a magnetic tape, a transparent leader tape having one end secured to a take-up reel and the other end connected to a starting end of the magnetic tape, and a transparent trailer tape having one end secured to a supply reel and the other end connected to a terminal end of the magnetic tape, which are accommodated within the cassette case. The miniature type tape cassette is loaded together with a tape cassette adapter having an external form and size identical to the standard type tape cassette into a standard type recording and/or reproducing apparatus, and is also loaded independently into a compact type recording and/or reproducing apparatus of a type different from the standard type recording and/or reproducing apparatus.

Abstract: An integrated read/write head assembly incorporates a thin film inductive write head subassembly comprising first and second pole pieces that define a write transducing gap, and a magnetoresistive read subassembly disposed in the write gap. The first write pole piece is extended so as to provide a planar conductive path from the terminal connections or studs to the magnetoresistive read subassembly, thereby forming a uniform surface for deposition of the magnetoresistive read subassembly.

Abstract: A disc drive cartridge arrangement includes a hub clamp for engaging a spindle of a disc drive which clamp has inwardly spiralling fingers to reduce the space required therefor and to firmly engage the spindle, and a door and aperture arrangement which allows the heads of the disc drive to enter the cartridge from the upper and lower surfaces of the cartridge. The hub to which the disc of the disc drive cartridge arrangement is mounted includes a labyrinth seal arrangement for preventing contaminants from entering the interior of the housing.

Abstract: A magnetic-tape cassette comprises a housing containing a magnetic tape, part of which extends across an opening in the front side of the housing which opening can be covered by a front cover of channel section which is pivotable on the housing at or near a corner thereof. In addition to being pivotable the front cover is also slidable on the housing when in the open position into a retracted position in which it extends along a side wall of the housing. In the retracted position the flanges of the channel-section front cover are received in, and substantially completely fill, recesses which are formed in the outer surfaces of the major walls of the cassette housing adjacent said side wall thereof.

Abstract: A video tape recorder comprises a loading disc, a supply reel mount and a take-up reel mount, a reel mount driving device to be selectively associated with the supply reel mount and the take-up reel mount to establish recording, playback, rewinding, fast-forward, and stop modes, and a mode switching device for selectively transmitting the rotatory force of the motor to the loading disc and the reel mount driving device so that the loading disc is rotated when the rotatory force is transmitted to the loading disc, and that the reel mount driving device is set to a selected one of said modes when the rotatory force is transmitted to the reel mount driving device.

Abstract: A magnetic recording/playback device in which a tape mounting device for mounting a magnetic tape in a cassette on a magnetic head drum or demounting the tape from the magnetic head drum into the cassette and a mode switching driving device adapted for effecting a switching of operation mode such as recording, playback, rewinding and forwarding are driven by a single driving power source, in good sequence through a change of the load imposed by the tape mounting device and the mode switching driving device, to permit a reduction in size and weight of the recording/playback device.

Abstract: A magnetic recording disk cartridge comprises a recording disk and a causing for accommodating the recording disk. The cartridge is provided with a shutter member for closing the magnetic head receiving openings in the casing. The shutter member is mounted in the casing for pivotal movement along the inner surface of the casing between an operative position in which it closes the magnetic head receiving opening and an inoperative position in which it opens the same. The shutter member is provided with projections on the surface facing the inner surface of the casing and slides on the projections along the inner surface of the casing when it is moved between the operative position and the inoperative position.

Abstract: A sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.

Abstract: A magnetic recording disk cartridge comprises a recording disk and a casing for accommodating the recording disk. The casing is provided with a pair of magnetic head receiving openings in the front and rear side walls thereof. The magnetic head receiving openings are normally closed and are opened when the cartridge is loaded in a recording-reproducing system. The shutter member for closing the magnetic head receiving openings is formed by bending a single plate material and comprises a pair of arm portions connected with each other by a bight portion. A pair of shutter portions for closing the respective magnetic head receiving openings are formed on the respective arm portions at an intermediate portion thereof. The free end portions of the arm portions respectively form bearing portions which are engaged with engaging ribs projecting inwardly from the front and rear side walls of the casing and support the shutter member for rotation about the ribs.