Abstract: A disc cartridge capable of holding a disc in a casing in a state of floating in a space in the casting to keep it in noncontact with the casing when the disc cartridge is not used. The disc cartridge includes an actuator arranged in a casing receiving a disc therein to releasable lock a shutter for a window and a disc receiver arranged in the casing and operatively connected to the actuator to selectively receive therein a part of a peripheral portion of the disc. The actuator is arranged to be slidable in a longitudinal direction of the disc cartridge to cause the disc receiver to be approachably moved with respect to the disc, so that the disc receiver may be engaged with the disc to rearwardly force the disc while keeping the disc in noncontact with the casing when the shutter is actuated to close the window and disengaged from the disc when the shutter is actuated to open the window.

Abstract: A disc cartridge capable of preventing a recording surface section of a disc from being contacted by a casing and placing the disc at a proper position in the casing without damaging and polluting, to thereby ensure the safe and smooth operation of the disc in the casing. The disc cartridge includes a pair of disc receivers each of which is formed therein with a recess for receiving a peripheral portion of the disc. The recess has an end surface contacting an outer periphery of the disc, which is formed into a substantially sideways V-shape of which an apex is positioned at substantially a center of the end surface to position the outer periphery of the disc at the center of the end surface.

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: A disc cartridge capable of preventing a recording surface section of a disc from being contacted directly by a casing to keep the disc housed in the casing at a safe state. The disc cartridge includes a pair of disc receivers each of which has a receiver body arranged so as to be approachable to the disc and formed into a sideways U-shape so as to define therein a recess for selectively receiving therein a part of a peripheral portion of the disc.

Abstract: A disc cartridge capable of providing a casing with torsional rigidity sufficient to ensure safety of a disc and smooth operation of a shutter. In the disc cartridge, an upper cover plate and a lower cover plate constituting a casing are formed at each of peripheral end walls thereof with projections and recesses engaged with one another, so that the cover plates may be joined together through the projections and recesses to form the casing which exhibits torsional rigidity sufficient to prevent deformation of the casing.

Abstract: A disc cartridge capable of effectively preventing a shutter from being opened even when any unexpected shock is suddenly applied to the disc cartridge during non-use of the disc cartridge. The disc cartridge includes a connection mechanism for operatively connecting to disc receivers, actuators for releasably locking the shutter. The connection mechanism is constituted by a guide groove provided in the actuator and formed into a substantially sideways U-shape, and a guide pin provided on the disc receiver and movably fitter within the guide groove. The guide pin is spaced from two surfaces of the guide groove opposite to the guide pin, in the actuating direction of the actuator. Also, the disc cartridge includes a substantially V-shaped spring for constantly positioning the guide pin within the guide groove and forcing the disc receiver to return to its original position to keep the guide pin apart from the opposite surfaces of the guide groove.

Abstract: A disc cartridge capable for ensuring smooth movement of a disc receiver for a long period of time with high reliability. The disc cartridge includes a pivot pin on which a disc receiver is supported so as to be pivotally movable about the pivot pin and which is mounted on a lower inner surface of a casing to inwardly project therefrom. The pivot pin cooperates with a bearing mounted on an upper inner surface of the casing to constantly form a gap in a thickness direction of the casing in the casing which has a distance sufficient to ensure smooth pivotal movement of the disc receiver about the pivot pin in the casing.

Abstract: A disc cartridge capable of effectively preventing opening of a shutter and damage of a disc therewithin, even when any unexpected shock is suddenly applied to the disc cartridge during non-use of the disc cartridge. The disc cartridge includes a connection mechanism for operatively connecting each of the actuators for releasably locking the shutter, to each of disc receivers, and which is constituted by a guide groove provided in the actuator and formed into a substantially sideways U-shape, and a guide pin provided on the disc receiver and movably positioned in the guide groove.

Abstract: A magnetic disc cartridge is composed of a pair of upper and lower case members so as to form a hard case to accommodate a magnetic disc therein. An aperture for access of a read-write head to the magnetic disc extends in a radial direction, which aperture is selectively covered by a shutter. The case has a groove on the peripheral edge thereof to receive a shutter actuation pin. The groove extends across the adjoining surfaces of the two case members. A groove portion defined by the lower case member is more enlarged than the remaining groove portion defined by the upper case member so that the shutter actuation pin does not catch in the step between the two groove portions.

Abstract: A disc cartridge capable of effectively preventing misoperation. The disc cartridge includes a write enable plug, a display section for indicating operation of the plug and a detection hole which are provided at each of upper and lower cover plates constituting a casing. The display section and detection hole of the upper cover plate are arranged opposite to the detection hole and display section of the lower cover plate respectively, and the write enable plug is arranged slidable with respect to the detection hole. Also, the disc cartridge includes a slide button for slidably actuating each of the write enable plugs, which is arranged so as to be operated from outside said casing.

Abstract: A disc cartridge capable of not only safely housing a disc in a casing but preventing the disc housed in the casing from being polluted with a foreign matter. The disc cartridge includes a casing formed with a slot and a pair of actuators each having an elongated cover plate member slidably fitted in the slot of the casing in a manner to outwardly projected through the slot. The actuator is provided with an elongated cover plate which is adapted to thoroughly and sealedly cover the slot of the casing.

Abstract: A magnetic tape cassette has a pair of tape reels contained in a lower casing in a rotatable manner and a leaf spring fixed to an upper casing to press down at the free end portions central projections of the tape reels, wherein the leaf spring is formed to have a substantially arcuate central portion and linear free end portions under non-loading condition, the free end portions being respectively in contact with the top of the central projection.

Abstract: A disc cartridge capable of effectively preventing a recording surface section of a disc from being directly contacted by an inner surface of a casing. The disc cartridge includes a casing having a space defined therein. An inner surface of the casing has a rear end surface section which is positioned opposite to an insertion side of the disc cartridge and against which a peripheral portion of the disc is abutted. The rear end surface section is formed into a substantially sideways V-shape so that the disc may be positioned at substantially a center of the casing in a width direction of the casing along the rear end surface section.

Abstract: A disc cartridge capable of preventing deformation and outward expanding of a shutter for openably covering windows of casing. The disc cartridge includes a shutter of which distal ends each are inwardly bent into a L-shape and upper and lower cover plates each of which has a U-shaped recess for slidably receiving the step therein and a tongue-like stopper hanging over the recess. The recess and stopper cooperate to constantly slidably interpose each of the steps of the shutter therebetween to prevent any deformation of the shutter.

Abstract: A tape cassette has a case with upper and lower halves and an open space at the front thereof. A magnetic tape housed in the case is wound around a pair of reels. A brake is slidably mounted on the inner surface of the lower half of the case to prevent the reels from being rotated. Part of a spring is attached to the brake. The spring has free ends and urges the brake in a direction. A device for positioning the spring includes a partition wall on the inner surface of the lower half of the case which partitions the open space from the inside of the case. An independent abutment member on the partition wall abuts the free ends of the spring.

Abstract: In a magnetic tape cassette of the type having a guard panel disposed at the front opening of the cassette housing to cover the opening when the cassette is in storage and expose it when in use, an electrically conductive tape, consisting of a metal foil supported by a base of plastic film, is affixed with adhesive or by ultrasonic welding or other technique to the inner surface of the guard panel. The metal foil may be located on either side of the base of the conductive tape to face the magnetic tape or the guard panel.

Abstract: A magnetic disk cartridge used for memory means for a computer, which comprises a hard case composed of a cover member and a bottom member, and a magnetic disk having a central hole in which a pivot shaft of disk drive means is inserted. An anti-abrasion chip having a polygon shape including a triangle is attached to the inside of the cover member so as to receive the free tip of the pivot shaft of the disk drive means in contact therewith while the magnetic disk is rotated within the hard case. The shape of the anti-abrasion chip is a regular triangle, a right-angled triangle, an isosceles triangle, a square, a rectangle, a trapezoid or the like. A producing method for a magnetic disk cartridge is also disclosed. The anti-abrasion chip having a polygon shape including a triangle is made by cutting an anti-abrasion sheet attached to a base sheet without causing a disuse portion thereof.

Abstract: A disk cartridge comprises a hard casing in which a magnetic disk is rotatably contained, wherein a wear-resistance material is provided at at least a part of a contacting area between a hub of the magnetic disk and the hard casing.

Abstract: A magnetic tape cassette including a lower housing section and an upper housing section assembled into a housing, a pair of reels held in the housing and carrying a length of magnetic tape wound thereon, and at least one magnetic tape guide wall provided at the front of the housing, characterized in that said at least one magnetic tape guide wall is formed in one piece with said lower housing section in such a relation that the magnetic tape guiding surface is substantially perpendicular to the outer bottom surface of said lower housing section and that said guiding surface is a matt surface.

Abstract: A tape cassette has a housing and a pressure pad apparatus mounted within the housing for bringing a magnetic tape into direct contact with a magnetic head. The pressure pad apparatus includes a pad, a spring joined to the pad for imparting a pushing force to the magnetic head, and a holding member mounted within the housing for holding the spring at two points spaced from each other. The effective length of the spring is greater than the distance between the two holding points of the holding member.