Abstract: A magnetic disc cartridge, having a jacket which contains a rotatable magnetic disc, is loaded into a cartridge holder of recording and/or reproducing apparatus for recording and/or reproducing signals on the rotatable magnetic disc. The cartridge has a guide groove longitudinally extending in a direction in which the cartridge is inserted into the holder for receiving a guide element provided in the holder. A shutter is movable across a window provided in the jacket between a closed position and an opened position, and includes a projection extending into the guide groove to be contacted by the guide element when the cartridge is inserted properly into the holder. The guide element thus moves the shutter is from the closed position to the open position thereof when the cartridge is inserted in the cartridge holder.

Abstract: A cleaning disk made of a thin fibrous material is provided with an opaque ring so that the cleaning disk will look like magnetic media to the sensors of a flexible disk system. The opaque ring may be in the form of a separate plastic ring which is bonded to the cleaning disk and extends to the center opening of the disk. Such a structure provides the requisite opaque area as well as providing reinforcement to the central area of the cleaning disk.

Abstract: A disc positioning device for positioning a disc having a center opening with respect to a spindle for driving the disc for rotation by bringing the center axes thereof into alignment with each other. An adapter in the form of a hemispherical body of a diameter greater than that of the center opening of the disc is mounted on the spindle in such a manner that the center of a spherical body from which the hemispherical body of the adapter is severed coincides with the center axis of the spindle at all times. The adapter is urged by a spring to be biased with the center thereof serving as the center of rotation.

Abstract: This invention relates to a magneto-optical storage and playback process for travelling information carriers, by recording on a magnetizable information carrier (1) in the form of a tape, disc or roller while the carrier is in motion, said information carrier having information areas which are larger than 0.2 .mu.m and smaller than 20 .mu.m in one direction of the information plane, the process being carried out by the production of a geometrical structure (4) by the action of the magnetic fields of the recorded information on particles whose greatest length is less than 0.1 .mu.m, preferably 0.02 .mu.m, and by optical scanning of these structures in which light of wavelength 0.38 to 0.8 .mu.m is diffracted on the surface of the moving information carrier (1) and diffraction images are produced which serve for the interpretation of the information.

Abstract: A multitrack magnetic head particularly suitable for automatic assembly comprises a first set of core parts (17) which are rigidly fixed on a first flat base plate (16) and a second set of core parts (31) which are rigidly fixed on a second flat base plate (19). A screening plate (35) is located between cores of the first and second core parts (17,31) and is welded to the flat base plates with its oppositely located longitudinal edges. The screening plate is preferably located with one side against the first base plate and with the oppositely located side against a resilient lug projecting inwardly from the plane of the second base plate.

Abstract: A rotary recording medium reproducing apparatus reproduces a rotary recording medium accommodated within a case. The case comprises a jacket provided with a space for accommodating the rotary recording medium and an opening for allowing the rotary recording medium to go in and out of the jacket, and a lid member inserted through the opening of the jacket for closing the opening of the jacket.

Abstract: A cassette tape player characterized in that a head base with a magnetic head disposed thereon is advanced by the closing operation of a cover openably disposed on a base, to bring the magnetic head into light touch with the surface of a cassette tape, whereby the starting position of a message recorded on the tape can be quickly determined.

Abstract: A thin-film magnetic head having a magnetic substrate made from ferrite, iron-aluminum-silicon alloy or like material, and an upper magnetic layer formed on the magnetic substrate with a lower magnetic layer and a conductive layer interposed therebetween. A portion of the upper magnetic layer is jointed to the magnetic substrate while another portion of the upper magnetic layer is jointed to the lower magnetic layer through a non-magnetic layer of SiO.sub.2 or like material constituting a magnetic gap. The lower magnetic layer, magnetic substrate, upper magnetic layer and the non-magnetic layer in combination form a closed magnetic circuit. A groove is defined between the lower magnetic layer and the magnetic substrate, and formed in the side surface of the magnetic substrate adapted to face a magnetic recording medium. The recess is filled with a non-magnetic material such as glass.

Abstract: A tape cassette for a magnetic recording and/or reproducing apparatus has at least one reel contained in a housing formed with an opening through which a tape wound on a reel can be withdrawn from the cassette housing for recording of signals thereon or reproducing the signals therefrom, and a lid is provided to move between a closed position covering the housing opening and an opened position exposing the housing opening. The lid is pivoted on the housing by means of a pair of pins which are formed on ear portions directed rearwardly from opposite ends of the lid and a pair of arcuated grooves receiving the pair of pins, respectively, and which are formed on side walls of the housing.

Abstract: The present invention provides a cleaning diskette suitable for use in an apparatus including a floppy-disc drive head, a platen and a foam pad, the diskette including a jacket having folded flaps to form a flat envelope and a cleaning disc received in the jacket and having a central circular hole formed therein, the jacket including a central circular window aligned with the central circular hole of the cleaning disc and having a diameter slightly larger than that of the central circular hole, an elongated radial slot extending from a position corresponding to the outermost track of the floppy disc to a position corresponding to the innermost track of the same and through which the drive head contacts with the surface of the cleaning disc, at least one circular opening located adjacent to the edge of the central circular window in the jacket and substantially diametrically opposed to the radial slot, and at least one cleaning opening located in the area of the jacket with which the folded flaps of the jacket

Abstract: A magnetic head and a method of producing same, wherein the magnetic head includes a head core formed of metallic magnetic material and has a head gap formed in a portion of the head core adapted to be positioned against a recording medium, and windings mounted on the head core. The material forming the head core is amorphous and has the following composition:(Co.sub.1-x M'.sub.x).sub.a Zr.sub.b Si.sub.c B.sub.d, where M' is at least one element selected from the group consisting of Cr, Mn, Fe Ni, Nb, Mo, W and Ti, 0.03.ltoreq.x.ltoreq.0.15, 3.ltoreq.b.ltoreq.25, 0.ltoreq.c.ltoreq.20, 0.ltoreq.d.ltoreq.5, and a+b+c+d=100.

Abstract: A remote control device for tape recorder is disclosed. The device comprises a microphone unit to be connected to a microphone amplifier system provided in a body of the tape recorder, various kinds of operating switches to be connected to a main control circuit provided in the tape recorder body, and a display means connected to the microphone and to be connected to the microphone amplifier system.

Abstract: A colored diskette for holding a floppy disk with an outer colored substrate sheet forming an outer envelope, the inside of which is lined by a conductive layer acting as a shield and which is lined by a liner in which the disk rests. The data stored on the disk is color-coded so that the diskette may be easily stored and classified according to the color of the substrate.

Abstract: A magnetic tape storage and drive apparatus in which the tape stored in the cartridge has a ferrule means attached to the lead end of the tape. The associated drive means includes a leader and threading apparatus for the tape and is used with a pair of spherical recording heads and pressure pads to eliminate the need for accurate tape tension control means.

Abstract: The length of tape that can be wound into a videotape cassette such as Betamax or VHS can be increased by modifying the casette to employ the braking mechanism of the invention. This involves a flanged reel in which teeth are formed only in the outer face of one flange, and a brake lever which has a finger formed with a tooth-engaging ramp that is inclined at 30.degree.-60.degree. to the inner face of said flange when the finger fits between adjacent teeth.

Abstract: A recording member for digital data, particularly a recording tape, has a plurality of generally parallel, closely-spaced recording tracks which each contain pre-recorded track-identifying and transducer-positioning servo information, as well as defined data-recording areas. The pre-recorded track-identifying information preferably comprises a digitally-encoded individual track address, and the servo information comprises separate bursts used in centering the transducer upon a particular track. Preferably, each such track has a dedicated area at its beginning, end, or both, which contain continuous repetitions of such positioning information, there being no data areas in such dedicated portions. Digital encoding of track addresses utilizes binary-type code format, accomplished by defining a binary "zero" as a recorded burst present at a first number of sampling points, and defining a binary "one" as a burst present at a second number of sampling points of a second duration.

Abstract: A tape recorder which comprises; a capstan for driving a magnetic recording tape at a normal constant speed; a first motor for rotating the capstan, including a first rotor magnet, a first rotating shaft mounted to the first rotor magnet and the capstan coaxially, and a first stator coil for applying a rotating magnetic field to the first rotor magnet; a first reel for taking up the tape; a second motor for rotating the first reel, including a second rotor magnet, a second rotating shaft mounted to the second rotor magnet and the first reel coaxially, and a second stator coil for applying a rotating magnetic field to the second rotor magnet; a second reel for supplying the tape; a third motor for rotating the second reel, including a third rotor magnet, a third rotating shaft mounted to the third rotor magnet and the second reel coaxially, and a third stator coil for applying a rotating magnetic field to the third rotor magnet; an FG pattern for producing a signal which has a frequency in accordance with a ro

Abstract: A magnetic tape-cassette apparatus comprising at least two push-buttons which have individual functions in the apparatus, when individually pushed in to produce a normal travel of their push-button rods, the individual push-button rods being releasably latched in the position in which the individual function is performed. The two push-button rods, when pushed in simultaneously, are depressible beyond the normal travel over a common overtravel path as a result of pivoting of a catch to perform a further function. Pivoting of the catch is controlled by engagement of at least one pin with portions of at least one guide contour.

Abstract: In order to provide a 4-cassette magazine that does not require removal from the recorder-player in order to replace one or more cassettes, the magazine is composed of a turnstile rack providing compartments fitting the cassettes and open to the periphery, seated in a shallow pan having a rim that closes off the periphery of the turnstile except for one gate opening through which a cassette may be ejected or inserted when a compartment containing it is in registry with the gate opening. The stationary pan is part of a deck on which is mounted a rim drive for the turnstile which is combined with an indexing device and arranged to controllably propel a cassette into or out of a compartment when the turnstile is stopped. The pan has an aperture for a cassette lowering and raising device onto which a cassette is slid by the turnstile to bring it into operating position. Another aperture serves to assist cassette insertion or ejection.

Abstract: An improved design for a compact floppy disk cartridge is provided in which the wiping fabric is prevented from moving and causing stringers out the head access window. This is accomplished by providing ribs on both halves of the cartridge case which, together with raised peripheral edges on the case, provide an irregular shape. The wiping fabric is cut to a shape which conforms with the outline provided by the combination of ribs and peripheral edges. Thus, the wiping fabric is keyed into the space defined by the ribs and peripheral edges.Other improvements embodied in this design are: a compression return spring for a sliding shutter which is substantially completely covered by the shutter (thus preventing debris from interfering with the spring); and temporary interference fit closure of the cartridge shells to permit non-destructive testing.