Abstract: In a recording and/or reproducing apparatus of the kind having a recording and/or reproducing head arranged to be shiftable in the radial direction of a flexible disc, which is used as a record bearing medium, and a disc stabilizing member which is provided with a recessed part formed along the path of the movement of the head. The recessed part is formed to have a wider opening width at its portion located closest to the center of the disc than at its portion located closest to the outer periphery of the disc.

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 circuit reduces the row select voltage swing in a memory array, thereby reducing access time, power dissipation, disturb problems, glitches on the output, and alpha particle sensitivity. A row driver transistor is coupled between a first voltage source and the word line of a row of memory cells and has a base coupled to a row decode signal. A clamp circuit coupled to the base clamps a voltage on the base in accordance with a current provided by a current mirror coupled thereto. A write enable circuit is differentially connected to the current mirror and the clamp circuit for enabling the clamp circuit during a read mode for limiting the voltage swing on the word line.

Abstract: A disk driving device includes a cartridge holder for accommodating a disk cartridge. Guide rollers associated with the cartridge holder are each guided by a guide slot to move the cartridge holder so as to load the disk cartridge in the device. The device includes a mechanism for preventing information from being unwantedly written into the disk which is encased in the disk cartridge.

Abstract: A nonvolatile random access memory comprising a memory cell including a first MOS transistor having a drain connected to a bit line and a gate connected to a word line, a memory transistor having a drain connected to a source of the first MOS transistor, a control gate connected to a first control signal line and a floating gate for storing charges, and a second MOS transistor connected between a source of the memory transistor and a ground potential and connected to a second control signal line. The memory cell operates as a random access memory cell when the first control signal line is an "H" level and the second MOS transistor is turned off in response to and "L" level on the second control signal line, and operates as an EEPROM when the first control signal line is an "L" level and/or a "V.sub.p " level.

Abstract: An automatic control mechanism for a tape cassette player comprises a control motor selectively rotatable in first and second directions, a cassette holder movable between a cassette load/eject position and a cassette operating position, and a head plate movable to any of a plurality of positions respectively enabling operation of the cassette player in a plurality of modes. First, second and third cams are mounted for reversible rotation by the motor. A first operating arm controlled by the first cam effects reversible movement of a tape cassette within the cassette holder between an ejected position and a loaded position. A second operating arm controlled by the second cam effects reversible movement of the cassette holder between the cassette load/eject position and the cassette operating position. A third operating arm controlled by the third cam effects reversible movement of the head plate to a selected one of the mode-enabling positions.

Abstract: A cassette comprising a housing made of two portions having a front surface provided with an aperture through which access can be had to the video tape, this aperture being closed by a flap/hingedly mounted to the cover. This flap is locked by a bolt consisting of a lever of synthetic material molded integrally with a resilient arm acting as a return spring and which is engaged by a notch on a lower boss on which it is held by a boss rigid with the cover. The lock can be introduced freely into its recess and positioned automatically when fitting the cover. The release is obtained in the known manner through a window.

Abstract: A disc drive arrangement 10 for accessing information from and recording information onto a disc 25 to be retained in a cartridge 27 which comprises a carriage 24 for mounting and transporting the head 26, 28 accurately relative to the cartridge 27. The carriage 24 includes a base 100 upon which is mounted the head 26, 28 and cylindrical roller bearings 214, 216, 218, 220 and 222. The roller bearings 214, 216, 218, 220 and 222 roll on a plurality of hardened rods 228, 230 which are mounted on a track 102 which is affixed to the floor 16 of the disc drive 10. At least one of the roller bearings 214, 216, 218, 220 and 222, is resiliently mounted relative to the base 100 in order to evenly distribute the load placed by the base 100 on the track 102. Further any potential contaminants collecting on the rods are urged to one or the other side of the rods 228, 230 as the cylindrical rollers 214, 216, 218, 220, 222 roll on said rods thereby insuring accurate position of the head 26, 28.

Abstract: A first precharging and equalizing circuit (7) precharges and equalizes I/O buses (10 and 10') in advance to selection of bit lines, and following thereto, a second precharging and equalizing circuit (12) precharges and equalizes the I/O buses (10 and 10') during driving operation of a sense amplifier (2). Thus, potential levels of the I/O Buses (10 and 10') are prevented from being changed by vibration of the output level of the sense amplifier (2) transmitted to the I/O buses (10 and 10') through parasitic capacitance (8) during driving operation of the sense amplifier (2).

Abstract: A cut-off clock .phi..sub.5 generated by a cut-off clock generation circuit PG is supplied to a decode circuit DEC. The decode circuit DEC decodes the cut-off clock .phi..sub.5 to produce two types of cut-off clocks .phi..sub.5L and .phi..sub.5R. The two types of cut-off clocks .phi..sub.5L and .phi..sub.5R are supplied to a control clock generation circuit as shown in FIG. 3 or 11, which in turn produces control clocks .phi..sub.2L and .phi..sub.2R. The control clocks .phi..sub.2L and .phi..sub.2R are supplied to a shared sense amplifier of FIG. 1, to control on-off operations of transfer transistors 7.sub.L, 8.sub.L, 7.sub.R and 8.sub.R.

Abstract: A hard disc cartridge arrangement 10 including a housing 12 and a hub clamp 22 which cooperate so that the hub clamp 22 firmly and precisely engages the spindle of a disc drive, and a door arrangement 24 which allows the heads of the disc drive to enter the cartridge 10 from the upper and lower surfaces 14, 16 of the cartridge 10. The door 26 is locked in the closed position to prevent contact with the data storage media and is urged to a positive open position so that it does not interfere with the placement of the heads adjacent the disc 20.

Abstract: In a tape cassette, particularly a video tape cassette, equalization of electrostatic charges between the two faces of the tape is effected by a connector element or connector elements electrically connecting at least one of two electrically conducting guide elements contacting the front of the tape and provided on the two sides, respectively, of the cassette with at least the associated one of two electrically conducting tape deflecting elements provided in the two respective front corners of the tape cassette. In this manner sticking of the tape to the deflecting elements due to electrostatic attraction therebetween and also the build-up of electrostatic charges along the tape path parallel to the front of the cassette housing due to the transporting of such charges from the deflecting elements as a result of the tape travel, are counteracted.

Abstract: Apparatus for data transfer with a disk cartridge having a flexible magnetic disk rotatably housed in a protective envelope with some play in its own plane. A motor driven hub has a socket defined concentrically therein, with an annular disk bearing surface formed around the socket. Rotatably mounted to a hinged clamp arm, a clamp has a tapered collet engageable in the socket in the drive hub through a central opening in the magnetic disk, and a flange on the collet for clamping an exposed annular portion of the disk against the disk bearing surface. Being loose in the protective envelope, the magnetic disk has been liable to be caught in the drive hub socket by the tapered collet which travels along an arcuate locus into engagement in the socket.

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: Slant gap magnetic heads, comprised of back-to-back wedges, are produced by an inventive procedure: Bars of discrete coil-wound thin-film heads--which bars are, cross-sectionally, L-shaped--are stacked with respect to each other. By dicing through the stack of bars at an angle commensurate with the degree of gap-slant, discrete slant gap head structures are produced. With minimal contouring/lapping, such head structures may be finished for use in recording equipment that records chevron-like alternating skewed information tracks.

Abstract: An apparatus for data transfer with a magnetic disk having a metal made hub attached centrally thereto, with the hub having a first opening defined centrally therein and a second opening defined eccentrically therein. The apparatus includes a turntable which is mounted on a drive spindle and on which the magnetic disk is to be placed with the drive spindle engaged in the first opening in the disk hub. Arranged eccentrically on the turntable, a drive pin is engageable in the second opening in the disk hub for transmitting the rotation of the turntable to the magnetic disk. The drive pin is mounted on a leaf spring for retraction into the turntable when the magnetic disk is loaded thereon with its second opening out of register with the drive pin.

Abstract: A protective cover for electronical equipment such as a magnetic disk read-record unit includes a hinged cover element having sealing surfaces disposed on the edges thereof to prevent pollutants from being drawn into the electronic equipment, and also includes an actuator on the exterior of the cover which extends therethrough and cooperates with a mating element on the housing of the electronic equipment when said cover element is closed, to effect latching of the cover element in place and operation of the electronic equipment when said actuator is operated.

Abstract: In a rotary drive apparatus for a disk of the type in which the disk is mounted on a turntable, a central pin arranged at the center of the turntable and a drive pin arranged in a position spaced radially from this center of the turntable are respectively inserted in a central hole of the disk and a drive hole spaced radially from the central hole of the disk so that the disk is driven by the drive pin upon rotation of the turntable, and the drive hole of the disk is urged radially away from the center of the turntable by the drive pin so that the periphery of the central pin is pushed against the edge of the central hole for making the center of the disk coincide with that of the turntable; the drive pin is mounted for movement in a direction opposite to the rotating direction of the turntable and simultaneously in a direction radially away from the center of the turntable in reaction to the driving of the disk by the drive pin, thereby to ensure that the force that moves the drive hole of the disk in the di

Abstract: A mechanism for moving a magnetic read/write recording head across a tape storage medium. A linear actuator drives an output shaft which carries a cable connector. A flexible cable is connected with the cable connector at one end and at the other end with an elevator bracket which carries the recording head. The cable is bent through a 90.degree. bend between its ends along an arcuate guide surface. The elevator bracket moves up and down across the tape on guide pins. A spring maintains the cable under tension to translate horizontal extension and retraction of the actuator shaft into corresponding vertical movement of the tape head. The use of a cable reduces the application of moments to the head and avoids applying rotational forces.

Abstract: In a magnetic recording/reproducing apparatus with a U-type (.beta. system) tape loading system, a rotary head cylinder is inclined toward a point where is located on the peripheral surface of the cylinder through an angular distance of 139.degree. to 229.degree. in a direction of the running of a magnetic recording tape on the peripheral surface of the cylinder from a point where the tape is separated from the cylinder, and a tilt subpost is disposed downstream of the cylinder along a tape travel direction and is brought into contact with the tape fed from the cylinder to align a longitudinal edge of the tape to be substantially parallel with a base plate.