Abstract: A tape cassette including an upper half and a lower half to form a casing, both halves integrally connected at corresponding melt-bonding connecting portions through a melt-bonding rib; at least one of the melt-bonding connecting portions of the halves constituted by a concave portion and a convex portion which are engageable together, the engageable concave portion including two sections which are different in depth. The convex portion includes two sections which are different in height, at least one of the coupled concave and convex portion having a melt-bonding rib; and at least one of the engageable concave and convex portions having a hole at a central portion of the melt-bonding ribs.

Abstract: A tape cassette comprises a cassette casing composed of an upper casing and a lower casing; a pair of tape reels rotatably installed in the cassette casing and wound with a tape; a guide pin for controlling a running position of the tape; and a rotatable opening and closing lid for covering an opening portion of the cassette casing for drawing out the tape. A protrusion or protrusions are provided for restraining a height of the guide pin on a bottom face of a recess for inserting the guide pin provided on an inner face of the upper casing.

Abstract: A tape cassette is provided which includes a cassette body composed of an upper case and a lower case between which a tape wound on a pair of hubs is housed, and a front cover or lid pivotally mounted on a front end of the cassette body, a locking plate for locking said front cover and a resilient member for biasing said locking plate toward a position to lock the front cover, characterized in that the resilient member is in the form of a ring-form spring. The ring-form spring is simple in construction and easy to produce and assemble.

Abstract: A tape cassette capable of permitting a reel spring to be readily and accurately positioned on a casing for its mounting to highly improve workability and productivity in manufacturing of the tape cassette. The tape cassette includes a reel spring which is abutted against tape reels for elastically holding them. The reel spring comprises a spring body formed at an intermediate portion thereof in a longitudinal direction thereof with a plurality of mounting holes through which the reel spring is mounted on an inner surface of an upper casing member. The spring body is provided on each of both sides thereof in the longitudinal direction with one or two positioning recesses, each of which is positioned adjacent to each of the mounting holes.

Abstract: A tape cassette storage container comprisinga main body and an upper-lid, which are adapted to store a tape cassette including a pair of reels with a tape wound thereon, and pressing members urging the reels in a casing of combined upper and lower halves, the pressing members having top ends exposed outside from through holes formed in a window in an upper plate of the casing;wherein the upper lid includes a top plate which has an inner surface formed with pressing projections to urge the pressing members on closure; the pressing projections are made of inner thin-wall cylindrical projections; the top plate of the upper lid has the inner surface formed with outer thick-wall cylindrical projections to be around and close to the inner cylindrical projections; and the outer cylindrical projections have a shorter projection length than the inner cylindrical projections in such a manner to be out of contact with the window of the cassette casing.

Abstract: A tape cassette capable of satisfactorily exhibiting a stable braking function sufficient to prevent tape looseness during non-use of the tape cassette. A release lever is vertically movably arranged in a casing and downwardly forced by a coiled spring. Reel brakes each have a operating cam section against the release lever to be operatively associated therewith. Thus, a release pin provided on a side of a deck for driving or operating the tape cassette is upwardly abutted against a lower surface of the release lever.

Abstract: A tape cassette comprising a casing for housing a tape-like medium, which is made of synthetic resin; the casing including an upper half casing and a lower half casing, which are connected together at connecting portions as one unit; a cylindrical projection which is formed on either one of the upper half casing and the lower half casing, and which has a hollow recess and a receiving recess formed therein to be apart from each other by a partition wall; a pole-like boss which is formed on the other half casing to project therefrom, and which has an engagement rib and a supporting rib, the engaging rib being adapted to be inserted into the receiving recess of the cylindrical projection, and the supporting rib being adapted to support an abutting surface of the cylindrical projection; the supporting rib having an abutting surface formed thereon to receive the abutting surface of the cylindrical projection and to form a gap between melt-bonding surfaces of the cylindrical projection and the pole-like boss when t

Abstract: A housing case for a tape cassette, including a main body, a lid pivoted to the main body at one edge and an index card for indicating various items on the tape cassette, said index card being inserted along the inner surface of the lid, said lid including a flat portion 19, a step portion 23 and a recess portion 21 for receiving a thick portion of the tape cassette. the step portion 23 is provided with at least one retainer lug 31 consisting of a slanted surface extending from, and away from the plane of, the inner surface of the flat portion in the direction of the insertion and a surface extending from the distal end of the slanted surface in the direction substantially normal to said flat portion 19, and said index card is provided with at least one opening for receiving the retainer lug 31. The construction makes it easy to insert the index card which is then held securely in position.

Abstract: A tape cassette which includes a case composed of an upper case and a lower case in which a couple of tape reels wound with a tape are rotably provided and which is provided with an opening and closing lid being rotatable around supporting axes and covering an opening portion of the case for drawing out tape at a front face of the case, said opening and closing lid being urged in a closing direction thereof by a spring, wherein a spring receiving groove for inserting an end of the spring is provided in one of the supporting axes and at least one edge portion at an innermost portion of the spring receiving groove is formed in a curved face.

Abstract: A tape cassette capable of ensuring smooth and positive traveling of a magnetic tape in a casing. Sheet elements each are formed with a pair of apertures aligned with hub holes and a strip-like projection projecting toward the inner surface of a casing, which is formed on each of the upper and lower inner surfaces thereof with a land of a width larger than the diameter of the hub hole in a manner to face the projection of the sheet element. The casing is also formed on each of the upper and lower inner surfaces thereof with a pair of recesses in a manner to interpose the land therebetween and the sheet elements each have a pair of end edges extending in the longitudinal direction thereof, which are arranged so as to overhang the recesses of the casing.

Abstract: A tape cassette housing capable of ensuring safety of a tape cassette in non-use of the tape cassette or during storage and transportation of the tape cassette. The tape cassette housing includes a housing body, a cover, a hinge for relatively openably connecting the housing body and cover to each other, and one or two pairs of projections provided on an inner surface of one of the housing body or cover. The projections are arranged in a manner to positionally correspond to pressing members of a tape cassette for holding reels of the tape cassette through the pressing members when the tape cassette housing is closed while receiving the tape cassette therein, to securely hold the pressing members, resulting in rendering the reels immovable in the tape cassette without any clattering. The housing may be provided with a locking mechanism for locking the housing body and cover together when the tape cassette housing is closed, to thereby further enhance safety of the tape cassette.

Abstract: A magnetic tape cassette comprises a casing formed with upper and lower half casings and reel hubs rotatably supported in the casing to wind and rewind a magnetic tape, wherein at least one of the upper and lower half casings has ribs in the reel areas in the inner sufrface of the base plate so that a number of recesses are formed by the ribs, and wherein the depth of the recesses produced by forming the ribs is varied in correspondence to the degree of roughness of the outer surface of the base plate which is determined by requirements in designing the half casing having the ribs.

Abstract: A magnetic tape cartridge which is capable of permitting tape guides and a magnetic tape to exhibit resistance to wear and resistance to scraping sufficient to prevent the wearing of the tape guides and ensure the safe traveling of the magnetic tape over a long period of time, respectively. A polyester film forming a base of the magnetic tape contains a basic filler which absorbs a basic indicator bromothymol blue thereon while keeping it blue and a pair of the tape guides contacted with the polyester film are formed of ultra-high-molecular-weight polyolefin.

Abstract: A magnetic tape cassette capable of effectively eliminating a variation in pressure of the elastic pad element during traveling of a magnetic tape and preventing a variation in tension of the tape, to thereby ensure stable and safe traveling of a magnetic tape. The magnetic tape cassette is so constructed that an elastic pad element which is formed into a dogleg shape is supported at the bent portion thereof on a support rod arranged in a casing and a first section of the elastic pad element extending between the support rod and one end of the pad element is arranged so as to extend substantially in the tangential direction of a tape guide roller at the position of the guide roller at which a holding portion of the elastic pad element acts on the guide roller. The first section may be arranged in proximity to the portion of the magnetic tape between the one reel and the guide roller when the holding portion is defined in such a manner as in a conventional magnetic tape cassette typically constructed.

Abstract: A magnetic tape cassette capable of positively and rapidly accomplishing the lock release operation irrespective of the direction of force applied to a lock release mechanism to open a front lid. The cassette includes a lock lever regulating mechanism for regulating movement of a lock lever to permit it to be pivotally moved in a direction perpendicular to the longitudinal direction thereof about a holding section of a projection of the lever. The holding section is formed at a position downward apart from the projection and vertically opposite to a lock pawl engaged with the front lid with the projection being interposed therebetween. The lock lever regulating mechanism is constituted by a combination of a position regulating rib provided at the casing and a guide groove formed at the lock lever.

Abstract: A tape reel for a tape cassette includes stabilizing ribs positioned on opposite sides of a deposition rib. The stabilizing ribs are lower in height than the deposition rib and are provided with an abutment surface which extends parallel to the joining surfaces of the reel hub and reel flange. As the deposition rib is melted to join the reel hub and reel flange together, the melt distributes uniformly between the joining surfaces of the reel hub and reel flange, thereby preventing any deformation of the tape reel, such as deflection and/or warpage of the outer periphery thereof. A simplified manufacturing process yielding uniform product quality results.

Abstract: A plasma-polymerized film is formed by depositing and polymerizing a metal element-containing material forming an electrode and a gaseous polymerizable carbon-containing reactant in a plasma atmosphere. The polymerized film contains the metal element Mt and carbon C in an atomic ratio Mt/(C+Mt) of at least 1/100. The polymerized film is prepared under a condition W/(F.M) of at least 10.sup.8 joule/kg wherein W is a power applied for plasma generation in joule/sec., F is a flow rate of the gaseous reactant, and M is the molecular weight of the gaseous reactant, F.M being expressed in kg/sec. Such a polymerized film is advantageously applied as a coating to a surface of a member which constructs or is disposed in a casing in which a tape or disk-shaped medium is received for travel or rotating motion.

Abstract: A tape cassette comprises a cassette casing composed of upper and lower halves, wherein fixed tape guides each having a partially or completely cylindrical configuration are disposed along a tape transportation path defined within the casing. Each of the tape guides is secured fixedly by press-fitting it onto a continuous or discontinuous polygonal supporting rib dimensioned to be circumscribed by the tape guide.

Abstract: A magnetic tape cassette capable of highly improving workability and productivity in its manufacturing while ensuring its satisfactory function. The cassette includes a spring for constantly urging each of hub braking levers in a direction of engaging the lever with a reel hub to selectively lock the reel hub. The spring is formed so as to have a substantially straightly extending or flat shape when it is unloaded or in a free state and arranged in a casing in a manner to be constantly kept deflected by cooperation of an urging element and a support element each provided on the hub braking lever and a holding element provided on the casing and constantly abuttedly held at one end thereof on a contact element provided on the hub braking lever.

Abstract: Tape guides for a magnetic tape cassette comprise a half of cylindrical tube each adapted to fit securely over a support post within the housing of the cassette. The method of manufacturing the guides consists of forming thin-walled portions as grooves on at least the inner or outer side of a tube, with or without inwardly protruding ribs, which facilitate the division and provide a tight fit of the half piece to the post, and then dividing the tube along the plane into two halves. The tube is made of a metal, particularly brass or stainless steel, or plastics and formed by drawing or other irregular-shape forming technique, with polishing, plating, and/or precision polishing before division.