Abstract: A magnetic tape cassette, particularly well adapted for high-density recording applications, in which the entry of dust and other contaminants is positively prevented. The cassette includes upper and lower half cases and a slide guard for closing an opening through which the tape can be extracted for recording and reproduction. The slide guard is in the form of a plate and is mounted so as to be slidable forwardly and backwardly of the cassette. A spring is provided to bias the slide guard towards the front end of the cassette. Protrusions are formed on the inner surface of the slide guard so as to be slidably in contact with the outer surface of the lower half case.

Abstract: A miniature audio tape cassette is provided with a slide guard which normally covers the reel insertion holes of the cassette when the cassette is not in use. The slide guard is engaged with the cassette body by inserting portions of the same between the assembled upper and lower cassette halves. In one embodiment, the slide guard is provided with an engaging part which includes a portion slidable along the inside surface of the upper cassette half. The upper surface of this sliding portion is tapered in order to facilitate assembly of the slide guard, the upper cassette half, and the lower cassette half. According to a second embodiment, the slide guard is provided with inwardly extending portions which form overhangs with respect to the lower cassette halves. The engaging portion abuts against a flanged surface of the upper cassette half and has a tapered portion which engages a similarly tapered surface of the sides of the lower cassette halves.

Abstract: A magnetic tape cassette particularly well adapted for use with digital audio magnetic tapes, which is small in size and easy to assemble. The cassette includes upper and lower half cases and a slide guard for covering a lower part of an opening through which the magnetic tape is extracted for recording and reproduction. The slide guard is in the form of a substantially U-shaped plate member having side pieces at its opposite ends which extend along side walls of the cassette. The slide guard is urged towards the front end of the cassette and is slidably mounted so as to be slidable forwardly and backwardly of the cassette. Overhangs are formed on upper edges of the side pieces of the slide guard confronting each other and which are received in the cassette through slits formed in the side walls of the cassette. Upper edges of the overhangs have the form of tapered surfaces inclined inwardly of the slide guard.

Abstract: A small sized tape cassette is provided with a slide guard which, when in the normal position, prevents the reel hubs from being inserted in the cassette. The guard panel of the cassette is interengaged with a reel locking mechanism which is automatically engaged when the guard panel is closed.

Abstract: A magnetic tape cassette of the type in which the tape is extracted from the cassette through tape drawing openings formed at opposite sides of a central opening in the cassette for recording and reproducing. In accordance with the invention, each of the tape drawing openings in a rectangular opening defined by a lower rib protruding from the lower half case and confronting one edge of the magnetic tape, a guide formed integrally with the lower rib and having a sliding surface with which a rear surface of the magnetic tape contacts, an upper rib protruding from the upper half case and confronting the other edge of the magnetic tape, and a cassette case wall confronting a front surface of the magnetic tape. The upper rib is recessed farther inwardly of the guide than the sliding surface.

Abstract: A magnetic tape cassette of a type particularly useful for high density digital audio recording wherein the tape is positively protected from dust and other contamination. The cassette includes a pair of hubs on which the magnetic tape is wound, and a locking member for locking the hubs. An opening is provided through which the tape can be extracted for playing. A swingable guard panel is provided which closes the front part of the opening when the cassette is not in use, and a slidable slide guard closes the lower part of the opening. The locking member has locking parts engaged with annular parts formed on the hubs to prevent rotation of the hubs, the locking member being slidable in a direction forwardly and backwardly of the cassette. The slide guard is in the form of a plate slidable on the outer surface of the bottom of the cassette forwardly and backwardly. A compound spring is provided which has a fulcrum part locked to a boss formed in the cassette case and two arms extending from the fulcrum part.

Abstract: In a magnetic tape cassette storage case having a casing and a cover to close and open the casing, recesses are formed in the inner surfaces of the cover and the bottom of the casing to receive a magnetic tape cassette's thicker portion which forms an opening in the front wall of the cassette.

Abstract: A magnetic tape cassette storage case having a casing made up of a pocket for receiving the rear half of a magnetic tape cassette and a broad wall obtained by extending one wall of the pocket. A first cover, swingably connected to the pocket, has a first recess formed in its inner surface. A second cover, swingably connected to the broad wall, has a second recess formed in its inner surface. The first and second recesses receive the cassette's thicker portion in combination when the case is closed by the first and second cover. With the inventive case, the space required for storing the cases is smaller than that required for storing the same number of conventional ones.

Abstract: A magnetic tape cassette in which loop formation during slackening of the tape is prevented and the tape is wound on the winding hub without being displaced laterally, thereby preventing jamming of the cassette and deformation of the tape. The cassette includes a pair of hubs on which the magnetic tape is wound, two guide rollers, one at either end of an opening formed in the front of the cassette, and two inner guides, one provided between each of the guide rollers and a respective one of the hubs. Each inner guide includes a cylindrical barrel having a tape sliding surface, and a protrusion extending from the cylindrical barrel. The protrusion, which has a tape sliding surface wider than the tape, is turnable rearwardly of the cassette. A tape guide groove is formed in the tape sliding surface of the cylindrical barrel having a width slightly greater than that of the tape.

Abstract: A magnetic tape cassette system is described, comprising a magnetic tape cassette and a storage case therefor, wherein at least one of the magnetic tape cassette and the storage case is molded using a resin composition containing from 75 to 95% by weight of .alpha.-methylstyrene-acrylonitrile copolymer (A) and from 5 to 25% by weight of graft copolymer (B) obtained by reacting a polybutadiene-based rubber with monomers consisting of styrene and acrylonitrile, wherein said .alpha.-methylstyrene-acrylonitrile copolymer is a copolymer having a composition consisting of from 75 to 90% by weight of .alpha.-methylstyrene, from 10 to 25% by weight of acrylonitrile, and from 0 to 5% by weight of styrene, and 30% by weight or more of said .alpha.-methylstyrene-acrylonitrile copolymer is a copolymer component having a composition containing 82% by weight or more of .alpha.-methylstyrene.

Abstract: A pad which is to be provided in the interior of a videotape cassette according to this invention is in the form of a hollow cylinder. When fitted in place in the interior of a videotape cassette, the cylindrical pad is yieldingly deformed to produce a resilient force, thereby pushing a videotape against an associated guide stud. Because of the cylindrical shape, the pad requires no large space to mount, and accordingly a videotape cassette can be substantially reduced in size. The cylindrical pad need only be pushed into place in the interior of a cassette housing, and this easy mounting is advantageous to the mass-production of videotape cassettes.

Abstract: A magnetic tape cassette for either video or audio tapes in which creasing of the tape during high speed running is prevented. Tape guide members are provided having grooves in the circumferential surface thereof. The grooves can be provided by cutting or molding them into a rod-shaped member or by a tightly wound wire. The guide member can be either mounted in a fixed position or rotatably between the two cassette casing halves.

Abstract: A miniturized video magnetic tape cassette of the type in which a magnetic tape wound on a pair of hubs in the hollow interior of a cassette casing is guided to run across a front opening formed in the casing along a rotatable front cover and in which the tape can be pulled out of the front opening in the cassette. The tape cassette includes locking mechanism having a supporting shaft fixed to a bottom wall of the casing and a hub rotatably mounted on the supporting shaft. An L-shaped locking lever extends from the hub and a first stop extends from the hub in a direction opposite that of the locking lever. A coil spring has a coil portion disposed around an upper portion of a hub in which a slit is formed. A first end of the coil spring is inserted into the slit while the second end abuts against an inner surface of a side wall of the casing.