Abstract: A magnetic disk medium having a magnetic layer formed on its substrate, is characterized in that in a portion of the substrate where a magnetic head runs is formed a concave groove in which a cushion material is provided, whereby the contact pressure appearing between it and the magnetic head is lowered.Preferably, the cushion material is either plastic foam selected from the group consisting of polyurethane foam, polystyrene foam, cellular polyethylene, cellular rubber, cellular polyvinyl chloride, and foamed polyester, or elastic silicone resin.

Abstract: A magnetic head for recording information on both sides of a magnetic medium utilizing perpendicular recording has two similar head blocks disposed opposite to each other. The magnetic medium having recording films on its both sides is placed between the two head blocks. Each of the blocks consists of an auxiliary magnetic pole, a main magnetic pole enclosed in the auxiliary pole, and a coil wound around the auxiliary pole.

Abstract: A driving device of a tape player of the type wherein a flywheel; drive gear; and capstan shaft are driven integrally by a motor, a gear arm is provided so as to turn about the capstan shaft, two idle gears are supported on the gear arm each of which is in gear with the drive gear, a pair of reel stands are arranged each spaced equally from the capstan shaft, and reel gears rotatable together with the respective reel stands are positioned in opposition to the respective idle gears, which is characterized in that the idle gear opposite to the reel gear of the supply-side reel stand is provided with a mechanism for generating a frictional resistance, whereby the turning resistance of the idle gear opposite to the reel gear of the supply-side reel stand is set larger than the turning resistance of the idle gear opposite to the reel gear of the take-up-side reel stand.

Abstract: A thermal transfer printer erases previously recorded characters by applying heating energy of higher surface density than that used to originally transfer thermally fusible material onto a recording sheet. A thermal transfer tape made of a polyester film and a layer of thermally fusible material is interposed between a thermal head of the printer and the recording sheet at the position to be erased. The thermally fusible material has a higher adhering affinity for the polyester film than for the recording sheet at the higher heating energy level and thus fusible material previously recorded on the recording sheet adheres to the tape at the higher energy level. When the tape is pulled away from the recording sheet, the previously recorded character adheres to the tape and is pulled away with it.

Abstract: A waveguide filter comprises waveguides with length corresponding to the center frequency of a band pass filter, and shunt plates. Each shunt inductor plate has sufficient size to cover an opening of the wave guide and includes an induction window smaller than the opening, and each opening is opposed to each induction window. The waveguides and the shunt inductor plates are alternately arranged in close contact state, and the center frequency of the filter scarcely deviates.

Abstract: A disk recording and reproducing device includes a chassis, a front panel mounted on a front side of the chassis, a disk holder movably mounted on the chassis for holding an information storage disk, and an eject button unit for operating the disk holder to allow the information storage disk to be ejected therefrom, the eject button unit being lockingly mounted on the chassis and having a portion projecting through the front panel. The eject button unit is mounted in place on the chassis before the front panel is attached thereto.

Abstract: A liquid crystal light valve has two base plates of glass and transparent electrodes formed thereon with a ferroelectric liquid crystal interposed between the electrodes, wherein one of the electrodes has a film of insulative material oriented in a specific direction through rubbing treatment, and the other electrode has a film of insulative material treated with a coupler material for horizontal orientation but not oriented in a specific direction.

Abstract: Disclosed is a thin film circuit substrate which comprises an electrically insulating substrate, and at least one conductor layer and one protecting layer which are formed on the substrate, the insulating substrate having a surface roughness which is equal to or smaller than 0.1 .mu.Ra when measured as a center line average height. The thin film circuit substrate is suitable for use, for example, in a thermal head.

Abstract: A disk recording-reproducing device including a clamp mechanism and eject mechanism for a disk, which is characterized by an eject board abutable on an insertion front end of the disk and urged toward an insertion opening for the disk, a lock mechanism for locking the eject board when the disk is inserted up to a drive position, a lock-release member for releasing the locked state of the eject board, and a cam member rotatable as it is rubbed by the lock-release member at the time of insertion of the disk. Either the cam member or the lock-release member is movable in cooperation with the eject board to shift in the direction of insertion and ejection of the disk, and the other is movable in cooperation with the clamp mechanism to shift substantially perpendicularly to the revolution plane of the cam member, whereby a comparatively large dimensional clearance is allowed for the cam member and lock-release member.

Abstract: A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are transmitted together with a video signal, the selected signal is given to an intercarrier demodulator and an aural signal band-pass filter, the intercarrier demodulator provides a beat signal corresponding to the difference between the video carrier and the sound subcarrier, the beat signal is demodulated to obtain the sum signal, and the sound subcarrier provided by the sound signal band-pass filter is demodulated to obtain the difference signal and the pilot signal. The demodulating system is intended to eliminate disturbing signals included in the composite signal and buzzing, and to obviate the malfunction of the MPX decoder due to the disturbing signal having the same frequency as that of the pilot signal.

Abstract: A thin type variable resistor for use with a portable radio receiver set, which is far thinner even with a knob than the prior art. The surface of a slider receiver is formed with slider mounting portions which partially rise from the upper surfaces of sliders integrally with said slider receiver. The knob is formed with a recess for fitting the slider receiver. That recess is formed with loosely fitting portions for loosely fitting said slider mounting portions.

Abstract: A voltage-controlled-oscillator with a modulator, comprising a first variable capacitance diode and a second variable capacitance diode. The first variable capacitance diode is connected in series with the second variable capacitance diode to form a resonance device, wherein capacitance of the first variable capacitance diode is controlled by applying a reverse bias voltage and an oscillation frequency control voltage to both ends of the first variable capacitance diode, and capacitance of the second variable capacitance diode is controlled in a reverse direction to changes in the capacitance of the first variable capacitance diode with respect to the oscillation frequency control voltage by applying the oscillation frequency control voltage and a modulation signal to both ends of the second variable capacitance diode to thereby provide a frequency modulated wave.

Abstract: A voltage-controlled-oscillator with a modulator, comprising a first variable capacitance diode, a second variable capacitance diode, and a third variable capacitance diode. The second variable capacitance diode is connected in series with the third variable capacitance diode to form a serial connection member.

Abstract: A magnetic head for vertical magnetic recording having a leg portion formed on a core on the recording and reproducing side, which leg portion is put in connection with the recording and reproducing magnetic thin film and a leg portion formed on a core on the erasing side, which leg portion is put in connection with the erasing magnetic thin film. A recording and reproducing coil is provided on the leg, or pillar, portion formed on the core on the recording and reproducing side and an erasing winding, or coil, is provided in a groove, or on a pillar portion, formed on the core on the erasing side.

Abstract: A method of manufacturing a magnetic head assembly including a carriage, a lower magnetic head fixed to the carriage, a spring-loaded arm connected to the carriage, and an upper magnetic head fixed to the arm and facing the lower head, the upper and lower heads defining therebetween a clearance having a width which is equal to the thickness of a magnetic disk, the arm is so supported at its end remote from the upper head that it may be rotatable only in a direction which allows the upper head to face the lower head.

Abstract: A printer wherein when in printing, a platen and a head are opposedly disposed by a carriage, said printer comprising a bottom plate on which said platen or said head is disposed, and a body hinged to said bottom plate and designed to include said carriage, said body and said bottom plate being relatively rotated.

Abstract: A disk memory device includes a housing, a front panel attached to the housing and having a slot for insertion of a memory disk into the housing, a circuit board fixedly mounted in the housing, a mechanism including at least a disk drive unit and accommodated in the housing, and vibroisolating members fixed to the housing for isolating the mechanism from vibrations applied to the housing.

Abstract: A rotary type electronic device has a casing, a rotatable operating shaft with one end disposed through a front wall into the casing, a rotary electronic unit in the casing including a rotatable slider retainer which is engaged with the end of the operating shaft, a fastening member fixed on the end of the shaft and engaging the slider retainer, and a spring washer compressed between the fastening member and the casing front wall. The spring water is secured non-rotatively to the fastening member, engages an inner groove on the shaft to hold the shaft axially through the front wall of the casing, and has a protrusion on an annular spring part bearing against the front wall of the casing to provide a click feeling with rotation of the shaft.

Abstract: A printer characterized in that a paper feed path for guiding a record paper to a printing position formed between a platen and a head is disposed on the same plane on the whole including the printing position and portions before and behind the printing position.

Abstract: A printer includes a drive claw associated with a printing wheel and having a projection engageable with axial, circumferential grooves of a drive shaft. The printing wheel is linked to and rotated by the drive shaft when the projection of the drive claw engages one of the grooves. However, during type selection, a selection claw engages teeth of a selection ratchet to stop the rotation of same, so that when an engagement means of the selection ratchet engages the drive claw, the projection of the drive claw disengages from the groove of the drive shaft, so as to detach the rotation transmitting relationship between the drive shaft and the printing wheel.