Abstract: A tape cassette comprises a case including upper and lower halves, each having a pair of parallel side walls and a back wall extending between the side walls, a pair of reels housed in the case on which magnetic tape is wound, and a brake member freely slidably mounted on the inner face of the lower case half, the brake member having a pair of legs which slide on the inner face of the lower case half along the side walls thereof, movable to a position wherein rotation of each of the reels is prevented. A control device is provided for limiting the movement of each of the legs of the brake member in the direction of the width of the case. The control device includes members each of which projects from a respective one of the side walls of the upper case half and is located adjacent to one face of a respective one of the legs of the control device which is opposite to the face thereof which slides on the inner face of the lower case half.

Abstract: A disk cartridge having a hard casing in which a magnetic disk with a hub is rotatably received. A stepped portion is formed at a peripheral edge portion of a contacting surface of the hub which is in contact with a supporter on a driving unit to support rotation of the hub, thereby increasing flatness in the contacting surface.

Abstract: A magnetic tape cassette including a protective cover pivotally mounted to the front side of a housing is constructed such that damage to the protective cover, resulting from an undesired contact of the cover by positioning pins of the cassette recording/playback apparatus when the positioning pins are inserted into positioning openings of the tape cassette, is prevented by providing cutouts in opposite end corner portions of the elongated planar main portion and arm portions of the cover.

Abstract: In a magnetic tape cartridge having a detection opening which can be opened or closed with a plug to prevent erroneous erasure of recorded signals on the tape, an indication opening through which the plug can be seen from the outside and a slot through which the plug is positioned as desired are both formed in a first wall of the cartridge housing, and the detection opening is formed in a second wall located differently from the first, in such a manner that the indication opening or slot is selectively closed by sliding of the plug from one position to the other or vice versa. The plug includes an elastic lock member in sliding contact with the inner surface of the first wall. The first wall has two grooves such that, when the plug is in either position, the lock member fits in the corresponding one of the two grooves. The plug is L-shaped along the inner surfaces of the first and second walls, and the lock member is disposed in a recess formed within the plug.

Abstract: A magnetic tape cassette is provided with a detection hold laterally extending between two cylindrical holes extending from the upper surface of the upper half casing and the lower surface of the lower half casing in which ribs are formed in the detection hole to restrict vertical movement of a magnetic tape running between the two cylindrical holes.

Abstract: A resiliently-mounted protective cover mounted on a magnetic tape cassette is controllably moved between exposed and protected positions along substantially the same path of movement during each use of the cassette. Blocking walls are provided in the interior of the cassette for preventing contaminants from reaching and contacting the magnetic tape therein.

Abstract: A tape clamp mechanism for the reel hub of a tape cassette has a clamp block for clamping a tape to the reel hub. The clamp block has a main block having spaced opposite ends, an outer curved surface and an inner surface corresponding to the outer circumferential curved surface of the reel hub. A first pair of prongs project from the inner surfaces of both ends of the clamp block. A bridge member is provided on the inner surface of the main block. A second pair of prongs projects from the bridge member. The reel hub has a recess for receiving the clamp block. The recess has cavities for interacting with the first and second pairs of prongs of the clamp block. The clamp block is settable in the recess of the reel hub by a snap mounting or friction fit mounting method.

Abstract: A tape cassette has a case containing a pair of reels for winding magnetic tape. An outer lid is pivotally mounted on the case to open and close the outside of the passage through which the magnetic tape is stretched along the front of the case. An inner lid is pivotally mounted on the inside of the outer lid to open and close the inside of the passage through which the magnetic tape is stretched. A slide member is formed on the inner lid. A guide groove is formed in the case to guide the slide member. The slide member is made of material different from the edges of the guide groove.

Abstract: A magnetic disc cartridge is composed of a pair of upper and lower case members superimposed one upon the other 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 and is formed by a wall member extending integrally from one of the two case members towards the other so as to hide a joining line between the two case members.

Abstract: A magnetic tape cartridge is provided with a pressing spring secured to a cartridge to press a spring-contact projection formed at the center of the upper part of a reel. The pressing spring includes a reel-contacting part formed at its inner part, a spring-functioning part holding the reel-contacting part and a base plate connected to a root portion of the spring-functioning part. The reel-contacting part presses the spring-contact projection of the reel downwardly so that a pressing force acts on the reel in its axial direction.

Abstract: In a magnetic tape cassette comprising upper and lower half casings, at least screw-fastening portions and their neighboring portions at four corners of the upper and lower half casings are formed by a two-layered structure consisting of the first layer of an opaquelayer, a transparent layer or a semitransparent layer and the second layer of a transparent layer or a semitransparent layer which is laminated on the first layer in one piece.

Abstract: A tape cassette including a housing of two sections joined with a magnetic tape inside has in its front wall a center opening for magnetic head and two openings for capstan insertion, each housing section having a U-shaped guide joined to a partition behind one capstan opening. In each housing section the U-shaped guide has a pair of guide ribs formed on the opening side and having a height greater than the tape width, and a wall supporting the rear portions of the guide ribs and partitions formed at the rear of the center opening and the other opening are all formed to a height about half that of the guide ribs.

Abstract: A magnetic tape cassette, especially a video tape cassette, including front and inner lids is equipped with spring fitted on pivot of the inner lid and engaged at one free end with the front lid and at the other end with the inner lid to bias the latter in the closing direction to provide dustfree protection for the magnetic tape inside.

Abstract: A tape cassette includes a pair of reels for a magnetic tape. Each reel has a center opening. A plurality of first ribs extends radially into the opening from a peripheral wall of the opening. A recorder deck has a pair of parallel drive spindles. Each drive spindle is for insertion into one opening of the pair of reels. Each drive spindle has a second rib. The second rib is adapted for engagement with the first rib. The first rib includes an end face having a planar surface on a trailing side of the first rib. The trailing side is defined with respect to a tape-slack removing, rotational direction. The planar surface is inclined in such a manner that insertion of the spindles into the openings, the second rib engages the first rib, and creates a force which drives the reel in the tape-slack removing rotational direction.

Abstract: A disk cartridge comprises upper and lower hard casings whose inner surfaces are respectively attached with lining sheets and the upper and lower hard casings receives a magnetic disk in a rotatable manner. Elastic pieces are respectively provided on the inner surfaces of the upper and lower hard casings at opposing positions and each of the elastic members is interposed between a lining sheet and the upper and lower hard casings.

Abstract: A tape pad for a magnetic tape cassette is placed in the running path of a magnetic tape held in a casing so as to be in press-contact with said magnetic tape. The tape pad has a one piece structure of a tape contacting part and an elastic part for supporting the tape contacting part by molding carbon-containing polyethylene terephthalate.

Abstract: A disk cartridge comprises a hard casing which receives a magnetic disk with a hub in a rotatable manner and the lower surface of a circular recess of the hub is slightly raised from its outer peripheral portion toward the central opening of the hub in which the driving pin of a driving unit is fitted.

Abstract: A magnetic tape cassette comprises a locking means which is slidably placed between a locking position of coming into engagement with a pair of reels held in the magnetic tape cassette and a releasing position of disengagement from the reels. The locking means is provided with a pair of flexible pawls which are curved in an arch form in the direction of separation from each other; a guide rib is fixed to the inner bottom surface of a cassette casing and between the pair of flexible pawls, the width of the guide rib being decreased toward the root of the pair of flexible pawls; and a pair of guide pins are provided at the outside of the pair of flexible pawls.

Abstract: In a magnetic tape cassette comprising a cassette housing, a lid pivotally connected to the front of the housing to open and close its front opening, and a lock member fitted in one front side portion of the housing and engageable with and disengageable from the inner surface of the lid, a lock-member-biasing spring is accommodated within the thickness of the lock member, with a free end engaged with the housing. The lock member has means with which to press the both end portions of the spring in place. It has also a bulge formed on its side opposite to the recessed side and which is larger in diameter than a pivot by which the lock member is supported by the housing. The bulge is accommodated within a wall opening of the cassette housing.

Abstract: A magnetic tape cartridge comprising upper and lower half casings and a lid placed in the front of said upper and lower half casings so as to be opened and closed, in which pivot pins of the lid are fitted into supporting openings formed in the upper half casing or the lower half casing and the dimension at the entrance of each of the supporting openings is smaller than the diameter of each of the pivot pins so that the pivot pins are forced to be snap-fitted into the supporting openings.