Abstract: A recorder-reproducer includes a rotary head cylinder against which a tape from a tape cassette is slidable, two movable bodies for moving the tape toward and away from the rotary head cylinder, two connectors having ends angularly movably coupled to the movable bodies, respectively, and a sole rotatable body to which opposite ends of the connectors are angularly movably coupled. The rotatable body has a recessed portion with at least one of the connectors being positioned for interference with the recessed portion. At least one of the connectors has two relatively slidable connector plates and a spring acting therebetween. The recorder-reproducer also includes a pivot shaft about which the rotatable body is rotatable, at least one of the connectors having a means for preventing said one of the connectors from interfering with the pivot shaft.

Abstract: A head positioning add mechanism for a multitrack data cartridge recorder including a stepper motor, a lead screw driven by the stepper motor and a head mounting slide engaged with the lead screw by a partial female thread for incrementally moving a recording/playback head transverse to the path of a magnetic recording tape to enable accurate positioning of the head at any given track across the tape.

Abstract: Magnetic head unit (1) in a plastic mounting (3) which encloses the magnetic head casing (30) behind the head face (4). The plastic mounting (3) has tape guide elements (7) which guide the magnetic tape moved along the head face (4) in the correct azimuth position. The connecting pins (26) projecting from the rear wall (25) of the head casing (30) are joined to a connecting plate (27), to which the connecting cables (32) are connected. A connecting bracket (28) serving for earthing is provided on the magnetic head casing (30) and is connected to the connecting plate (27) substantially parallel with the connecting pins (26) of the magnetic head casing (30).

Abstract: A cartridge receiver with a tray pivotally coupled to a cover pivots from a cartridge receiving position to an operating position in a limited amount of vertical space. A cartridge is guided into and properly aligned within the tray in the receiving position and the cover is then closed and the cartridge receiver latched into an operating position. A plunger attached to the cover exerts a downward force on the cartridge when the cover is closed. Pins attached to the frame align and support the cartridge when the cartridge receiver is in an operating position. A threading pin is coupled to the cover and the tray for engaging a cartridge leader block and a bridge is attached to the tray to align the leader block with the threading pin. The leader block is guided back into the cartridge when the tape is rewound. A cartridge present sensor, a file protect sensor, and a latch sensor are also employed as part of the cartridge receiver.

Abstract: A tape cassette has a housing and a pressure pad apparatus mounted within the housing for bringing a magnetic tape into direct contact with a magnetic head. The pressure pad apparatus includes a pad, a spring joined to the pad for imparting a pushing force to the magnetic head, and a holding member mounted within the housing for holding the spring at two points spaced from each other. The effective length of the spring is greater than the distance between the two holding points of the holding member.

Abstract: An eject mechanism for ejecting automatically the tape cassette in a tape player, in which one of two switching gears disposed on both the sides of a gear plate and engaging with a forward/backward rotating gear is selectively engaged with an intermittent gear by said forward/backward rotating gear and said intermittent gear drives the driven mechanism for the eject operation, said intermittent gear being so constructed that it is locked only in the forward rotational direction.

Abstract: In a magnetic head of perpendicular magnetization type having main and sub magnetic poles arranged at both sides of a recording medium, a nonmagnetic supporter holding a high permeability magnetic thin layer of the main magnetic pole is formed by a polycrystalline sintered body substantially composed of titanium carbide and alumina. This polycrystalline sintered product well matches with a recording medium having a cobalt-chromium alloy layer so that the recording medium does not wear for a long time of use, and therefore, so that the contact surface of the main magnetic pole is hardly damaged. The same sintered body may also be used for the sub magnetic pole arranged to be in contact with the recording medium. Some structural improvements are also provided so that undesirable influence due to an adhesive layer adjacent to the magnetic thin layer is removed. One or more additional thin layers may be provided for reducing crosstalk between adjacent tracks.

Abstract: A fast forward and reverse drive mechanism is disclosed, which comprises a fast drive link having a fast drive pin disposed at one end and supported rotatably by a pivot shaft at its center portion; a mode plate moving in the left and right directions; a fast forward drive lever and a reverse drive lever superposed on each other and locking the fast drive pin either at the forward side or the reverse side by pushing either one of the levers; two fast drive arms disposed rotatably at both sides of the fast drive link, each having a fast drive shaft at an extremity; guide holes formed at the left and right sides in the mode plate; the fast drive shaft being engaged through these guide holes with the mode plate so that the fast drive shaft moves left and right depending on left and right displacement of the mode plate; and guide holes, each of which consists of a press portion and a slide portion at its left and right sides, formed in the fast forward drive lever and the reverse drive lever, respectively, the gu

Abstract: A magnetic recording disk cartridge comprises a magnetic recording disk accomodated for rotation in a casing. The magnetic recording disk is provided with a center core having a central opening into which a spindle of a magnetic recording/reproducing system is inserted to be drivingly engaged therewith. The center core comprises a core block provided with the central opening and a pair of slits formed in the wall portion of the core block defining the central opening and spaced from each other by a predetermined distance; and a plate spring which extends across the central opening and the opposite end portions of which are fitted into the slits and held therein so that the plate spring can be resiliently deformed in a direction radial to the magnetic recording disk.

Abstract: A cassette transport lever is engaged by a cassette being inserted into the apparatus, for movement of the lever to an operating position; and upon subsequent reverse movement of the lever for ejecting the cassette. Upon movement of the lever to the operating position the lever engages a switch for turning on a motor which drives a control rod for controlling other apparatus functions. During ejection, guide surfaces on the control rod engage a delay element which holds the switch in the position for maintaining the motor turned on until the cassette is ejected past the position in which the motor was turned on during insertion. Upon the cassette reaching a second position, the guide surface releases the delay element so that the motor may be turned off. During insertion, the delay element engages a different portion of the guide so that the motor is only turned on when the ejection lever has been sufficiently rotated.

Abstract: Disclosed herein is a recording disc cartridge having recording disc rotatably mounted in a cartridge case by a hub assembly. The hub assembly comprises a receiving hole defined in its central portion for receiving a supporting shaft of a drive unit of a recording/reproducing apparatus, at least two wall members having flat surfaces disposed to face to the central hole with a predetermined angle in plan view, an annular guide groove formed around the receiving hole to receive a drive shaft of the drive unit and a rib member formed across the guide groove for being engaged with the drive shaft in such a position that the supporting shaft is pressed against the two flat wall members by rotational force of the drive shaft. A resilient arcuate arm projects from one of the wall members to clamp the supporting shaft of the drive unit of the recording/reproducing apparatus in the receiving hole of the hub assembly.

Abstract: A magnetic head feed device for feeding a magnetic head for recording information on a magnetic recording disk and/or reproducing information from the magnetic recording disk in a radial direction of the magnetic recording disk includes a driving force source which outputs a driving force for feeding the magnetic head as a rotational motion thereof, a rotational motion-linear motion converting mechanism for converting the rotational motion of the driving force source into a linear motion of the magnetic head.

Abstract: Erasable programmable memory cell having a control gate, a row line and bit line is disclosed. Line driving circuitry coupled to the bit line and control gate applies a negative voltage to the bit line during the ERASE mode. The latter voltage is such that the voltage across the control gate, floating gate and drain of the floating gate transistor is sufficiently great to cause charging of the floating gate. The construction of the line driving circuit for applying the various voltages, including the negative erase voltage, to the control gate of the floating gate transistor is also disclosed. The line driving circuit is responsive to a control signal indicating the operating mode of the memory, and further includes blocking transistors so that the V.sub.pp voltage of the write operation is not coupled back to the circuit input which receives the control signal.

Abstract: A disk presser mechanism in a magnetic recording and reproducing apparatus includes a rotatable turntable, a clamp member for clamping a disk on the turntable, a clamp arm supporting the clamp member and movable toward and away from the turntable, a drive lever operatively coupled to the clamp arm, an actuator cam for pressing the drive lever to move the clamp arm in a direction to cause the clamp member to clamp the disk on the turntable, a pad holder having a pad for confronting the disk, a spring member for urging the pad to be pressed against the disk, and an engaging portion acting between the drive lever and the pad holder for moving the pad holder away from the disk when the drive lever is released by the actuator cam to unclamp the disk.

Abstract: A cassette tape recording and/or reproducing apparatus has a head base assembly comprised of a first arm mounted, at one end, on the chassis for swinging about a first axis perpendicular to a plane on which a cassette is located on the chassis, a second arm connected in end-to-end relation to the other end of the first arm by a joint structure permitting relative angular displacements about a second axis parallel to the first axis, and a fixed guide post extending parallel to the plane of the chassis and passing slidably through a slot in the second arm for stabilizing the position of a magnetic head on the second arm in respect to a cassette on the chassis. The joint structure includes a screw defining the second axis and being turnable to relatively displace the connected ends of the arms along that second axis for rocking the second arm about the fixed guide post and thereby varying the aximuth angle of the head.

Abstract: A magnetic tape cassette having an upper half, a lower half and a front lid with a front plate and first and second side plates with first and second bearing shafts extending from the side walls, and the upper half formed with bearing means for receiving the first and second shafts which have guiding ramps which are continuously formed and which continue into a circular opening formation of fixed radius of greater than 180 degrees and which provide self-centering and self-aligning for the shafts.

Abstract: A clamper holding mechanism for moving a clamper and a disk into, and out of, engagement with a spindle of an information disk recording and reproducing device, including a clamper positioning mechanism movable between a first position disengaged from the clamper and the disk and a second position engaged with the clamper and the disk to move the clamper and the disk away from the spindle.

Abstract: A film magnetic slider which comprises a slider performing contact-start-stop actions on a recording medium and being provided with a film magnetic head device on the side end of the slider, at least the recording-medium-contacting part of the slider being made from a sintered material having a thermal conductivity of not more than 0.02 cal/cm.sec..degree.C. and an average crystal grain size of not more than 5 .mu.m has a good slidability on the recording medium and a good machinability and can improve the life of the recording medium.

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 small-sized, multifunctioned micro cassette tape player has one motor and one solenoid and a drive plate connected to the solenoid for moving a head base and a pinch roller between engaged and retracted positions. The tape player has a cam mechanism which includes a cam plate having a stopper portion for engaging a control pin on the drive plate to hold the drive plate at an intermediate retracted position from the engaged position, when the solenoid is deenergized for the first time after being energized, for high speed cue, review, and erasure operations. The cam plate also has a displaceable guide portion for allowing the control pin to pass and the drive plate to return to the fully retracted position when the solenoid is again energized and deenergized.