Abstract: A magnetic recording/reproducing apparatus of the helical scan system employing a MR head as a reproducing magnetic head. The magnetic recording/reproducing apparatus includes a MR head 6 and a rotary drum carrying the MR head 6. In reproducing signals from the magnetic tape 7 in accordance with the helical scan system, a magnetic tape 7, having a large number of projections 7c on the tape surface and containing an electrically conductive material in its magnetic layer, is used as a recording medium.

Abstract: To provide a polyacetal resin composition having an excellent corrosion inhibiting effect on metals, particularly reduced in the adverse effect on magnetic tapes or the like, and suitable for use in producing component parts of a magnetic tape cassette such as a reel hub or tape guide, 100 parts by weight of a polyacetal resin (A) is blended with 0.05 to 5 parts by weight of an antioxidant (B), 0.001 to 5 parts by weight of a specified nitrogen-containing compound (C), and 0.001 to 3 parts by weight of a boric acid compound.

Abstract: A tape cartridge includes a first rotatable hub and a second rotatable hub and a tape head receiving region. A flexible recording tape is wound upon the first rotatable hub and the second rotatable hub. The flexible recording tape is routed through the cartridge to provide two levels or layers of tape at the tape head receiving region. The tape path may include a flexible tape routed through the cartridge to provide two levels of tape at least one of the tape guides or tape pins within the tape cartridge. Of course the tape path through the tape cartridge may also include the tape head. At startup the tape always driven in the same direction so that the layer of tape underneath the other layer of tape is initially placed in tension. This prevents binding of one layer with respect to the second layer at startup. If the initial startup direction is opposite from the desired direction, the direction of the tape is reversed within the tape cartridge.

Abstract: An optical recording medium having at least one aluminum nitride and silicon nitride composite dielectric layer is provided. The amount of aluminum nitride in the dielectric layer, x, is more than zero and less than or equal to about 95 mol %. The amount of silicon nitride in the layer is represented as (100-x) and is equal to or greater than about 5 and less than 100 mol %. The refractive index of the composite dielectric layer is between about 1.70 and 2.15. The composite dielectric layer is sandwiched between a transparent support such as a plastic transparent support and an optical recording layer adapted to be irradiated by laser light in order to read, write or erase information in order to protect the recording layer.

Abstract: A cassette label comprising, an integrated circuit comprising a memory unit and a signal processing unit, an antenna members for carrying out at least a transfer of signals with respect to the integrated circuit, and a label body accommodating the integrated circuit and the antenna members and mounted on a back surface of a video cassette tape, and a video cassette tape comprising, a video tape for recording video signals, a cassette case for accommodating the video tape, and the cassette label mounted on the back surface of the cassette case.

Abstract: A tape cartridge has a tape detection means embedded therein. The tape detection means comprises a plurality of tape identification holes, preferably in octal 06 arrangement, and a single load point hole located about 30 inches from the nearest set of beginning of tape holes. A method of detecting a tape cartridge with a tape detection means embedded therein comprises the steps of: locating a set of beginning of tape holes; locating a load point hole that is 30 inches from the nearest set of beginning of tape holes; measuring the length of tape between the load point hole and the beginning of tape holes; if the length of tape is between 28 and 32 inches determining whether tape identification holes in octal 06 arrangement are present; and identifying the tape as a valid tape cartridge if the length of tape is between 28 and 32 inches and tape identification holes in octal 06 arrangement are present.

Abstract: A recording medium device adapted so that a recording medium on which information signals are recorded is accommodated. This recording medium device comprises a cartridge body within which the recording medium on which information signals are recorded is accommodated, and an erroneous recording prevention member including a portion of detection detected by a detection mechanism of the recording/reproduction unit side, and attached to the cartridge body so that it can be moved within the range between a first position where the portion of detection is detected by the detection mechanism and a second position where it is not detected by the detection mechanism.

Abstract: A cleaning device (1) for cleaning components (4,5,6,7,9,10,11) of a video unit comprises a cassette housing (15) having a pair of spools (24) rotatably mounted therein. A cleaning tape (30) is wound onto the spools (24) and is transferred from one spool (24) to the other on rotation thereof. The cleaning tape (30) when in a cleaning position engages the components (4,5,5,7,9,10,11) of the video unit. The cleaning tape (30) defines a central longitudinal central axis (46) which defines a sinusoidal waveform so that as the cleaning tape is wound from one spool (24) to the other along the magnetic tape path, the cleaning tape (30) cycles progressively over the components (4,5,6,7,9,10,11) for cleaning the magnetic tape path area (40) of the component and margin areas (41,42) on opposite sides of the area (40). The cycling of the cleaning tape (30) may be achieved by mechanical means.

Abstract: Apparatus and a method are provided for easily, visually indicating to a user that a tape cartridge has reached the end of its useful life by causing a flag, wound beneath a tape inside the cartridge, to appear within a clear window in the cartridge housing. When a tape drive in which the cartridge is mounted detects a defect in a data tape, the tape is rewound and extra torque is applied thereto to expose the flag. When a cleaning tape reaches its end, the flag is released.

Abstract: A method of attaching a tape having longitudinal edges to a tape cartridge reel includes cutting an end of the tape non-perpendicularly to the longitudinal edges laterally across the width of the tape. The end of the tape is then attached to the tape cartridge reel. The method may also include cutting an end of the tape such that at least two of the laterally spaced apart servo stripes running longitudinally along the tape are cut at different longitudinal positions along the tape. The method may further include cutting the tape end such that at least two of the laterally spaced apart data tracks running longitudinally along the tape are cut at different longitudinal positions along the tape.

Abstract: A magnetic recording medium (12) and a magnetic recording apparatus (10) that makes use of the magnetic recording medium is disclosed. The magnetic recording medium includes an elongated magnetic base film that is significantly thicker than conventional magnetic tape and that presents opposed front (20) and rear faces (22) and opposed upper (24) and lower edges (26) extending between the front and rear faces. One or more layers of magnetic material is coated on both the front face and on the upper edge of the base film. Data is recorded on the front face of the base film in a conventional manner, and sequencing or locating information is recorded on the upper edge of the base film. This permits a read/write head (18) to hover over the base film to read the sequencing information on the upper edge of the base film for locating the position of desired data stored on the front face of the base film.

Abstract: A tape-type magnetic recording medium is disclosed which is adaptable to a yoke-type magnetoresistance effect magnetic head and with which a dense recording operation can be performed and a signal reproducing method is disclosed for reproducing a signal recorded on the tape-type magnetic recording medium. The tape-type magnetic recording medium has a magnetic layer formed on a non-magnetic support member, wherein when an assumption is made that residual magnetic flux density of the tape-type magnetic recording medium is Br, the thickness of the magnetic layer is .delta., the saturation magnetic flux density of a magnetoresistance effect device of a yoke-type magnetoresistance effect magnetic head serving as a reproducing head is Bs and the thickness of the magnetoresistance effect device is t, the following relationship is satisfied:Bst/2.ltoreq.Br.delta..ltoreq.Bstand coercive force Hc of the tape-type magnetic recording medium satisfies Hc.gtoreq.1500 (Oe).

Abstract: A tape recorder and/or a playback device for a multitrack tape utilizes a magnetic head having active parts for recording and/or reading microtracks with the active parts being arranged in a two-dimensional matrix within a substantially planar surface of the magnetic head. A pressure device assures contact between the microtracks and the active parts by acting on a backside surface of the tape opposite to the front side surface containing the magnetic head. A structure allows for positioning the magnetic head in front of either one of at least two macrotracks which bundle addressed microtracks. A portion of the tape surface is supported adjacent to the macrotrack bundling the addressed microtracks to prevent unwanted tape deformation.

Abstract: A data storage tape cartridge having a misinsertion notch. The data storage tape cartridge includes a housing, a tape reel and a storage tape. The housing includes a base and a cover, each defining a front, a back, a first side and a second side. The misinsertion notch is defined in the base, extending from the front of the base and along the first side of the base. The misinsertion notch has a length less than approximately one-half a length of the first side of the base for facilitating proper insertion into a receiving frame.

Abstract: The object of this invention is to make it possible for a light transmitting member to be easily assembled onto a cover member molded from an opaque synthetic resin, and to prevent the constitutive elements from falling even when exposed to a shock. This object is attained by providing a recording medium cartridge device including an optical detection section which is produced after a light transmitting member has been attached to a window which is formed on the front panel of a cover member, or an element, in combination with a base plate molded from an opaque synthetic resin, to form the cartridge body accommodating a recording medium.

Abstract: A tape cassette and tape recording/reproducing apparatus including a tape partitioned into a plurality of partitions for recording data thereon, and a separate memory included in the tape cassette for storing control information relating to each tape partition, thereby reducing the time and number of operations needed to access a particular partition.

Abstract: The two sided magnetic recording tape consists of a standard film substrate to which a coating of magnetic recording materials is applied, on both sides thereof. In order to reduce the effect of magnetic print through and contact recording, the particles or films that are applied to both sides of the substrate are oriented during manufacture in differing magnetic orientations that are angularly displaced with respect to each other, either coplanar or non-coplanar on the recording surface of the magnetic tape.

Abstract: A tape recording medium with slant tracks formed in two longitudinal areas above and below a center line on the recording medium, wherein the slant tracks each include subcode data at a midportion of each track with two control data areas on either side of the subcode and two data areas on the outboard sides of the control data areas. The data areas can include audio data, video data, or computer data or a mixture thereof and the control data provides information specifying the kind of digital data that is recorded for use in reproducing.

Abstract: A magnetic tape cartridge library includes a memory which stores calibration parameters associated with the tape cartridges and the tape drives. The tape cartridges preferably have a cartridge identifier written to the tape in a plurality of locations along the tape. When a tape cartridge is inserted into a tape drive, the appropriate calibration parameters are retrieved in order to bypass a tape drive initialization sequence.

Abstract: A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta.

Abstract: A single reel tape cartridge includes a type of magnetic recording tape having characteristics which are identified to a cartridge tape handling system in accordance with size variation of a tape type hole following a beginning of tape (BOT) hole by a predetermined, qualifying distance. A cartridge tape handling system for identifying the particular tape type, and for formatting the tape in accordance with determined tape type is also described.

Abstract: It is disclosed that a longitudinal magnetic recording medium and apparatus has recording sections having longitudinal magnetic films magnetically isolated in a recording direction. The magnetically isolated recording sections can record a single bit each so that the longitudinal magnetic recording medium can remove the irregular domain boundary of its own caused on boundaries of magnetization reversals in the recording direction. This can improve the signal-to-media noise ratio to a great extent in writing and reading.

Abstract: A lubricating agent contains at least one alkylene oxide derivative having an alkylene oxide group and an ester moiety or an ammonium salt moiety, which is represented by the following general formula (1), (2), (3) or (4):R.sup.1 --O--(R.sup.2 O).sub.m --R.sup.3 --COO--R.sup.4 (1)R.sup.1 O--(R.sup.2 O).sub.m --R.sup.3 --COONH.sub.3 --R.sup.4 (2)R.sup.4 --OCO--R.sup.3 --O--(R.sup.2 O).sub.m --R.sup.3 --COO--R.sup.4 (3)R.sup.4 --NH.sub.3 OCO--R.sup.3 --O--(R.sup.2 O).sub.m --R.sup.3 --COONH.sub.3 --R.sup.4 (4)wherein R.sup.1 is a hydrocarbon group having 1 to 26 carbon atoms or a hydrogen atom, R.sup.2 is a hydrocarbon group having 1 to 6 carbon atoms, R.sup.3 is a hydrocarbon group having 1 to 26 carbon atoms, R.sup.4 is a hydrocarbon or fluorocarbon group having 1 to 26 carbon atoms, and m is from 1 to 12.

Abstract: The present invention relates to a magnetic recording medium including a base film made of an aromatic polyamide or an aromatic polyimide, and a magnetic recording layer formed on one surface of the base film, the number of large protrusions H2 on the surface of the base film on which the magnetic layer is to be formed and the number of large protrusions H3 on the surface of the side of the base film opposite to the surface on which the magnetic layer is to be formed satisfying the relationships of:H2.ltoreq.502.ltoreq.H3.ltoreq.100,the tensile Young's modulus E20 at 20.degree. C. in at least one direction and the tensile Young's modulus E100 at 100.degree. C. in the same direction satisfying the relationships of:E20.gtoreq.800 kg/mm.sup.20.5.ltoreq.E100/E20.The present invention provides a magnetic recording medium having excellent durability, running property and output characteristics even under severe conditions at high temperature.

Abstract: A fixed permanent pattern is used for identifying a magnetic recording medium and a high security against forgery or modification is obtained by a magnetic recording medium including a non-magnetic support and at least two magnetic layers formed on said support, characterized in that at least one of said at least two magnetic layers contains magnetic particles having a coercive force of 4,000 Oe or less dispersed in a binder and has a non-rewritable fixed signal which has been recorded by magnetic field generated by a signal recorded on one or more other magnetic layers under the influence of an orientation magnetic field.

Abstract: A data storage system includes a data storage medium, such as a magnetic tape, that has a first control data storing area or drive partition that is addressable only by a peripheral drive mounting the medium and a plurality of other addressable data storing partitions for storing data. A volume table of contents may be stored in one of the addressable partitions. A tachometer measures and indicates physical locations on the storage medium. Each of the partitions have an extent on the storage medium indicated by said physical locations. The control data in the drive partition includes directories of medium control blocks, such as tape marks, defect marks and the like; directory of all addressable partitions including the physical locations at the beginning of each partitions and other medium physical and logical parameter data. A so-called mount-demount medium control block in the drive partition indicates a demount status that shows all data stored in the drive partition is valid.

Abstract: A system to write a servo signal pattern onto a recording medium incorporating a transducer with a full-width write head, and one or more slotted erase head(s). The full-width write head is used to record signals across the full width of the recording medium; the erase head(s) is used to erase "nulls" in the servo signal pattern. The resulting servo pattern has an extremely good match of signal characteristics between the different portions of the resulting signal pattern, since the recorded patterns were all written in the same pass by the same write head. The use of precisely fabricated and aligned erase head(s) results in a very accurate signal pattern.

Abstract: A magnetic recording system for recording signals onto coat-type magnetic tape using magnetic powder by using a magnetic head, and a magnetic recording system for recording signals onto a coat-type magnetic disk using magnetic powder by running magnetic head in contact with the disk, are disclosed. The magnetic tape has a coercive force Hc of 2000 to 3800 Oe in the former system, while the magnetic disk has a coercive force He of 2000 to 3500 Oe in the latter system. In both systems, signals are recorded by using a magnetic head using magnetic core members having a saturation magnetic flux density of 15 kG or greater. The magnetic core member having the saturation magnetic Flux density of 15 kG or greater is exemplified by a material expressed by a composition formula (Fe.sub.95.5 Al.sub.1 V.sub.0.5 Nb.sub.0.5 Cu.sub.0.5 Ru.sub.2).sub.92 N.sub.6 O.sub.2.

Abstract: A method of writing on a two-reel, belt driven, multitrack tape cartridge wherein tape tension increases with the progress of tape transportation from one reel to another. Forward tracks on the tape are predivided into a first group adjacent the tape centerline and a second group adjacent one tape edge, and reverse tracks are similarly predivided into a first and a second group. Writing on each of the first group of forward tracks is started in a position spaced a less distance from the tape beginning than on each of the second group of forward tracks. Writing on each of the first group of reverse tracks is also started in a position spaced a less distance from the tape end than on each of the second group of reverse tracks. Thus the tape offers a greater storage capacity than if, as is conventional in the art, writing on the first groups of forward and reverse tracks is started in the same longitudinal tape position as on the second groups of forward and reverse tracks.

Abstract: A recording/reproducing apparatus using optical magnetic tape, comprises an objective lens for focusing the light generated from a light source, and an acousto optic scanner and an ultrasonic wave generator for vertically or horizontally displacing the focal point of the objective lens in order to scan a light beam onto the optical magnetic tape transferred along the outer periphery of a rotating drum. According to the disclosed principles, recording/reproducing at high speeds is possible, and a high data-transmission speed is obtained with a low rotating speed of the rotating drum, so that the instrument is stabile, small, and simple in construction.

Abstract: A magneto-optical recording medium on which rewriting is possible is composed of a substrate and a recording layer exhibiting perpendicular anisotropy formed thereon. The recording layer consists of at least a transition-metal layer and a rare-earth-metal layer, or at least two transition metal--rare earth metal alloy layers, which are alternately overlaid on each other, and each of the layers further contains a precious metal in an amount of 1 atom % to 10 atom %.

Abstract: A perpendicular magnetic recording medium has a magnetic layer comprised of two stacked sublayers each in the form of ferromagnetic metal thin film consisting of columnar crystal grains wherein the angle .theta. between the average growth direction of the columnar crystal grains and a normal to the substrate is .theta..gtoreq.45.degree. for the lower sublayer and .theta..ltoreq.30.degree. for the upper sublayer, and the mean maximum diameter of columnar crystal grains of the lower sublayer is not smaller than the mean maximum diameter of columnar crystal grains of the upper sublayer. An apparatus suitable for the evaporation of the magnetic layer is arranged as shown in the Figure. Magnetic flux associated with the upper sublayer finds an escape to the lower sublayer, preventing formation of a closed loop of magnetic flux within the columnar crystal grains of the upper sublayer. The lower sublayer is magnetized, thus contributing to an improvement in reproduction output.

Abstract: In the magneto-optical recording medium with a transparent substrate, a film of dielectric indium oxide, tin oxide or metallic Ti is interposed between the substrate and the recording layer, to prevent deterioration of the properties thereof.

Abstract: The tape in a data cartridge has a beginning of tape (BOT) zone adjacent a leading end, a load point (LP) zone adjacent the BOT zone, an end of tape (EOT) zone adjacent a trailing end, an early warning (EW) zone adjacent the EOT zone, and a data recording (DR) zone between the LP and EW zones. Servo tracks extending between the BOT and EOT enable the closed-loop servo operation of a tape deck during the recording of data at data flux transition densities within a predetermined range of flux transition densities. A BOT indicator includes a first type magnetic marker extending throughout the BOT zone and has a BOT flux density. An LP indicator includes spaced second type magnetic markers on the servo tracks at the border of the LP and DR zones. An EW indicator which is identical to the LP indicator is located on the servo tracks at the border of the DR and EW zones. An EOT indicator includes a first type marker extending throughout the EOT zone and has an EOT flux density.

Abstract: A magnetic recording medium and a magnetic tape cassette are disclosed, comprising a non-magnetic support having formed on one surface only thereof at least two layers including a lower layer and an upper magnetic layer formed thereon, wherein the surface electric resistance (Rs) of the surface of the magnetic layer of said magnetic recording medium is 10.sup.9 .OMEGA./sq or less, the non-magnetic support contains at least three different kinds of particles which vary from each other in at least one property of mean particle diameter and Mohs' hardness, and the opposite surface of the magnetic recording medium comprises the rear surface of the nonmagnetic support having at least 1,000 projections having a height of from 200 nm to 400 nm per 0.1 mm.sup.2, but with the provisos that not more than 1,000 projections are present having a height of from 400 nm to 700 nm per 0.1 mm.sup.2 and not more than 50 projections are present having a height of 700 nm or more per 0.1 mm.sup.2.

Abstract: A magnetic tape has three evenly spaced-apart longitudinally-extending servo track areas. Four equal-sized longitudinally-extending data track areas are disposed between said servo track areas and between longitudinal edges of the tape and one of said longitudinally-extending data track areas. For track following, all servo track areas are simultaneously sensed for producing one head positioning signal. Data tracks are arranged into four groups of tracks, one-half of the data tracks in each group are concurrently accessed. The data tracks on the tape are arranged in clusters. Each cluster has one track from each of the groups of tracks. Two laterally-adjacent track clusters constitute four data track wraps for serpentine scanning of data tracks. The concurrent track accessing respectively occurs in first and second halves of a data track wrap (there is a number of wraps equal to one half the number of track clusters). Each servo area indicates two lateral positions of the tape to the head.

Abstract: A unidirectionally long, biaxially oriented film of polyethylene-2,6-naphthalenedicarboxylate:(A) which has a Young's modulus of 400 to 600 kg/mm.sup.2 in the machine direction and a Young's modulus of at least 1,200 kg/mm.sup.2 in the transverse direction, the ratio of Young's modulus in the transverse direction to the Young's modulus in the machine direction being at least 2.5,(B) which has a heat shrinkage of 1% or less after heat-treated under no load at 105.degree. C. for 30 minutes, and(C) which has a surface roughness (Ra) of 0.005 to 0.010 .mu.m.This film is useful as a base film for magnetic tape having the capacity of log hours' recording and reproduction.

Abstract: A recording and reproducing device is provided. The device comprises a recording medium, a head giving and receiving recording signals to or from the recording medium, and a mechanism section and a circuit section giving and receiving the recording signals, wherein at least one protective film, and at least one fluorine-containing monomolecular film are formed in this order on the recording layer of the recording medium or on the surface of the head which comes into contact with said recording layer, wherein said protective film is a metal film, oxidized metal film, semi-conductor film, oxidized semi-conductor film, or organic monomolecular film, and wherein said fluorine-containing monomolecular film is formed by the chemical adsorption of a specific-type of silane compound that contains a perfluoroalkyl group at the molecular end on the surface of the protective film.

Abstract: A magnetic recording medium has recorded thereon a series of discrete time-limited servo signal bursts. To suppress residual fields emanating from each servo signal burst, at least one half-cycle of a compensating signal is recorded immediately prior to and immediately after each signal burst of a polarity opposite the polarity of the immediately adjacent half-cycle of the servo signal burst. Furthermore, each half-cycle of each compensating signal has a magnetic moment that is weaker than the magnetic moment of one half-cycle of the immediately adjacent servo signal burst.

Abstract: A biaxially oriented, unidirectionally long polyethylene-2,6-naphthalate film,(A) which contains(a) 0.05 to 0.4% by weight of first inert solid particles having an average particle diameter of 0.05 to 0.3 .mu.m, and(b) 0.005 to 0.05% by weight of second inert solid particles having an average particle diameter of 0.3 to 1.0 .mu.m, this average particle diameter being greater than the average particle diameter of the first inert solid particles by at least 0.2 .mu.m, wherein:(B) the Young's modulus in the length direction is at least 650 kg/mm.sup.2, the Young's modulus in the width direction is at least 600 kg/mm.sup.2, the Young's modulus in the length direction is greater than the Young's modulus in the width direction,(C) the heat shrinkage factor in the length direction in heat treatment at 70.degree. C. for 1 hour under no load is not more than 0.08%, and(D) the surface roughness, Ra, is 3 to 10 nm; and a magnetic tape obtained therefrom.

Abstract: A compact cassette is provided with substantially rectangular plastic support liner(s) between tape roll(s) and cassette wall(s), having at least one longitudinal bend, and the deflections of the support liners in a defined load range should be not more than a factor of 2 greater in the case of exposure to heat at about 85.degree. C. compared with no exposure. Suitable liner materials are those having glass transition temperatures equal to or greater than 85.degree. C., for example consisting of polysulfones, polyethersulfones, polyarylether ketones, polyetherimides, and/or blends and/or copolymers thereof.

Abstract: An audio tape cassette having a magnetic tape which is wound around a hub, a cassette shell and guiding parts which comprises a polypropylene resin including inorganic particles "A" dispersed in the tape cassette, wherein the magnetic tape has a back coating layer containing a polyester resin and inorganic particles "B" which have a hardness of not larger than that of the inorganic particles "A", and the magnetic tape has a CP value which is not larger than 1000 .mu.m.

Abstract: Copolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with perfluoro(butenyl vinyl ether) and, optionally, with a third comonomer are amorphous in all monomer proportions, and soluble in perfluoro(2-butyl tetrahydrofuran). These copolymers are suitable in many high technology applications, especially where solubility is important, e.g., in applying coatings to substrates or articles for protection against mechanical, chemical, or environmental hazards. Dipolymers of the present invention have lower glass transition temperatures than dipolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with tetrafluoroethylene having the same monomer proportions.

Abstract: A magnetic tape cartridge in which, to provide a connection between a magnetic tape and a leader tape, any additional steps which lower the productivity, such as the step of using an adhesive, are avoided, the manufacturing process is almost the same as a conventional process, and a positive connection between the leader tape and the magnetic tape is ensured. A single reel having a magnetic tape wound thereon is housed in the cartridge, and a leader tape is connected to an end of the magnetic tape, wherein the leader tape can be drawn out from an opening of the cartridge by a tape-drawing device of a recording/reproducing unit to enable tape travel.

Abstract: A data tape cartridge is formed on a baseplate of polymeric material which supports mounting pins and tape guides thereon for supporting tape components in rigid and dimensionally-stable manner using integrally formed bosses to support the mounting pins and guides. Additional stability against flexure is achieved using a matrix pattern of integrally-formed webs or ribs and sidewalls in the baseplate and by attaching a top plate substantially about the entire perimeter of the sidewalls. Lateral forces exerted against rotatable components on the mounting pins are transferred to the baseplate and top plate by the mounting pins that are supported in both plates. A midguide support is integrally formed in the baseplate to support a guide pin at critical location adjacent the location along the tape path in the cartridge at which a tape transducer interacts with tape.

Abstract: An oriented polyester film (A) which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing a 4,4'-diphenyldicarboxylic acid component and having a heat of crystallization of 16 to 25.5 Joule/g, and (B) which is biaxially oriented; and an oriented polyester film (A') which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing of a glycol component derived from a compound represented by the following formula, ##STR1## wherein each of n and m is independently a positive number of 1 to 9 as an average, provided that m+n equals 2 to 9 as an average and having a heat of crystallization of 6 to 20 Joule/g, and (B) which is biaxially oriented. These films are useful as a base film for a magnetic recording tape or as an electric insulation film.

Abstract: A magnetic storage device and a manufacturing method thereof, the magnetic storage device having grooves formed on a substrate, each of the grooves having a magnetic film formed therein. Since the magnetic head does not contact directly with the magnetic film, reliability of the magnetic disk increases. Moreover, the reproduced output of the magnetic head increases since the space between the magnetic head and the magnetic disk can be reduced. Accordingly, high-density recording becomes possible.

Abstract: A magnetic field indicator is provided which visually indicates the presence of a potentially harmful magnetic field by means of a magnetically responsive additive. In one embodiment, the additive comprises ferrite-encapsulating microspheres which contain ferrite flakes. The ferrite flakes are movably suspended within the microspheres so that the flakes are free to align with the lines of flux of a magnetic field. In the presence of a magnetic field, the ferrite flakes align themselves with the lines of flux of the magnetic field, thereby changing the reflectivity and other visual characteristics of the material which incorporates the ferrite flakes, so that an observer is able to visually detect the presence of a magnetic field. The magnetic field indicator may be embodied in accordance with a variety of applications.

Abstract: A video image storage, processing, and distribution system is provided with a processing and a distribution subsystem. The processing subsystem comprises at least one high performance video signal input device, one recording format independent hierarchy of storage, at least one recording format and resolution independent video data processor, and a high performance digital data recorder. The distribution subsystem comprises an archive library of recording format independent high performance digital tapes and instrument data players, a recording format independent hierarchy of staging storage, at least one recording format independent video distribution control processor, and a RF signal generation subsystem. The hierarchical storage of the processing subsystem comprises a first level of high performance random access mass storage amenable to large volume storage and high performance file transfers, and a second level of high performance random access storage amenable to high performance byte manipulations.

Abstract: A magnetic tape drive has firmware which has been modified so that the drive will read both standard formal tapes and non-standard format tapes. Non-standard tapes are detected by an absence of reference bursts in the load zone of the tape. The head is moved to successive tracks toward the edge of the tape until no data is read. This identifies the track near the edge of the tape. Then, the head is preset to a track which is a known distance from the edge of the tape. Reading of non-standard tapes is accomplished by disabling the index pulse generator in the intervals between data segments. The performance of a SKIP COMMAND is made possible by counting the transitions of data to no data during the intervals between data segments. The identification of different types of non-standard formats is made by determining the length of the data segments.