Showing papers by "Panasonic published in 1970"

Electrophoretic display device

Abstract: An electrophoretic display device in which an electrophoretic suspension layer including a dispersion of at least one electrophoretic material in a finely divided powder form suspended in a suspending medium is interposed between a pair of electrodes, at least one of which is transparent. A colored layer of a desired pattern is provided at the transparent electrode. An electric field is imposed between the pair of electrodes so as to change the optical property such as reflective color or luminescent color of the suspension layer by changing the spatial distribution of the electrophoretic material in the suspending medium electrophoretically.

Electrophoretic image reproduction process

Abstract: Electrophoretic image reproduction process is disclosed. In this process, a D.C. voltage is uniformly applied across an electrophoretic suspension layer including a dispersion of at least one electrophoretic material in a finely divided powder form suspended in a suspending medium, whereby said D.C. voltage changes the spatial distribution of said electrophoretic material so as to change an optical reflective property of said electrophoretic suspension layer. An electric field in a given image is then applied to said changed suspension layer, whereby said electrophoretic material stricken by said electric field moves electrophoretically and reproduces said given image on said electrophoretic suspension layer.

Magnetic Properties of Several Phases of Barium Orthoferrate, BaFeOx

Abstract: Various barium orthoferrates over wide Fe 4+ concentrations were prepared and their magnetic properties were investigated. The hexagonal phase with large Fe 4+ concentration is ferromagnetic above the anomaly point. With increasing Fe 3+ , it tends to be antiferromagnetic. The cubictetragonal phases are paramagnetic with positive paramagnetic Curie temperature. In these phases, the Fe 4+ -Fe 4 interaction is ferromagnetic, but the Fe 3+ -Fe 4+ and Fe 3+ -Fe 3+ interactions are antiferromagnetic. Some of the Fe 3+ and Fe 4+ ions in these phases take low spin states due to strong uniaxial crystalline fields caused by neighbouring oxygen vacancies. The triclinic I phase seems to have a magnetic structure of one-dimensional antiferromagnet. The magnetic structures of the triclinic II and rhombohedral phases resemble that of the triclinic I.

Electric dry shaver

Abstract: An electric dry shaver comprising a casing member including a cylindrical section closed at the bottom thereof and a tubular part extending peripherally therefrom, said cylindrical section containing therein a motor mechanism and a switch mechanism and said tubular part containing therein dry batteries and being encased with a covering member for gripping, and a shaver blade section mounted in the upper, open end of the cylindrical section. The motor and switch mechanisms are compactly packed in the cylindrical section and separated from the shaver blade section by means of a separator wall mounted in the open end of the cylindrical section. The separator wall including a peripheral wall provided on the inside with alternate smooth, sections and threaded sections and a stationary comb element having a skirt thereabout provided with external threads for attaching the comb to the threaded peripheral wall.

Electronic game board system

Abstract: An automated electronic system for the remote communication and display of chess or other board game moves in real time via a voice-grade telephone line. Each player has an electronic console which includes a chess board operative to provide unique indication of each of the 64 squares of the board and means for sending and receiving coded representations of each move.

Method for making an electric contact material

Abstract: Novel electrical contact materials are provided. The materials are comprised of three bonded layers including a top layer of palladium, an intermediate layer of a silver alloy and a nickel-copper alloy spring layer.

System for selecting channel

Abstract: A system for selecting stations or channels for television broadcasting, wherein a signal from a binary signal generator is fed to a channel selection circuit for driving the same to select a channel circuit so as to obtain a corresponding DC voltage for impression on variable capacitance diodes to change the tuning condition. Mechanically operated parts such as mechanical switches are eliminated to facilitate fabrication of a totally electronic integrated circuit. Unnecessary channels may be automatically skipped, and the channel selection may be made in either a forward or reverse direction.

Contactless pressure sensitive semiconductor switch

Abstract: A contactless switching device in which the conventional switch contacts are replaced by a semiconductor element whose resistivity is remarkably reduced when a pressure is imposed thereon.

Microwave oven door seal having dual cavities fed by a biplanar transmission line

Abstract: A microwave oven door seal is established when an access opening of a heating cavity is closed by a door. The seal includes a biplanar transmission line which extends in a first direction from within the heating cavity to a point outside the heating cavity. At such point, the biplanar transmission line turns and extends in a second direction away from the access opening. A first electromagnetic wave filter is fed by the first portion of the biplanar transmission line and a second electromagnetic wave filter is fed by the second portion of the biplanar transmission line for reducing the amount of electromagnetic wave energy which leaks from the heating cavity. The filters are cavities which are located along the biplanar transmission line and are designed to occupy a minimum of space to provide room for an observation window in the door. To improve the effectiveness of the seal on one side of the heating cavity in the event the door is pivotally mounted to an opposite side of the heating cavity the door is mounted so that it extends from the opposite side toward the one side at an obtuse angle relative to a wall at the one side of the heating cavity. As a result, both the width and the length of the first portion of the biplanar transmission line on such one side decrease so that the sealing characteristics thereof remain relatively constant during an initial opening movement of the door.

Phonon Drag Thermoelectric Power in Graphite

Abstract: According to Takezawa et at. , the thermoelectric power \(\mathfrak{S}\) along the basal plane in a synthetic single crystal graphite exhibits a sharp negative dip at T =35°K and a positive peak centered at 120°K. Subtracting the diffusion component \(\mathfrak{S}_{\text{d}}\) by use of an appropriate assumption, they have separated the phonon drag contribution \(\mathfrak{S}_{\text{p}}\) from \(\mathfrak{S}\). To get a theoretical explanation for \(\mathfrak{S}_{\text{p}}\), coupled Boltzmann equations for carriers and phonons are solved on the basis of a simplified ellipsoidal band model. The calculated \(\mathfrak{S}_{\text{p}}\) is proportional to T -3 above the dip temperature T d (35°K) and at T < T d it tends to zero as T 2∼4 with decreasing temperature. These behaviors are in qualitative agreement with the observed result.

Method for manufacturing magnetic heads

Abstract: A method for manufacturing magnetic heads having the tape travel surface partially covered with a non-magnetic material, comprising the steps of mounting a head core with the front side including a gap of a predetermined width substantially identical with a predetermined tape travel surface in a mating recess of the same contour as the core front formed in a non-magnetic frame member, and grinding said head core and said frame member to expose part of the core front.

System for synchronizing sounds with learning materials

Abstract: A system for synchronizing sounds with learning materials has a sound reproducing device, learning materials, stopping means and detecting means. The sound reproducing device is stopped by means of the stopping means and is started again by the stopping means which is released from the stopped position in response to output signals of the detecting means generated by detecting a change to the next part of the learning materials.

Variable resistor of sliding type

Abstract: A variable resistor of sliding type with switch means incorporated therein, which comprises a resistance element and a conductive element mounted on a dielectric base in parallel relation, a slider having a contactor which slides on the resistance element and the conductive element, and switch means adapted to break the electrical connection of the resistance element with an external circuit when the slider is close to either end of the dielectric base.

Stress sensitive semiconductor element having an n+pp+or p+nn+junction

Abstract: A stress sensitive semiconductor element comprising first and second low-resistivity regions of different conductivity types formed in a common semiconductor substrate, and a third region of a higher resistivity and of the same conductivity type as that of said first region, said third region being formed between said first and second regions in said common semiconductor substrate, and a constricted portion being formed at the non-rectifying contact between said first and third regions, wherein the length of said third region is longer than the effective diffusion distance of carriers; such a device having a good linear conversion characteristics and a high sensitivity, a wide range of application being expected for a high sensitivity microphone, various pick-up elements and switching elements.

Magnetic Properties of (Cr1-xFex)O2

Abstract: The solubility limit of Fe-ion in CrO2 and the properties of (Cr1-xFex)O2 were examined Added Fe-ions dissolve into CrO2 and form an oxide of (Cr1-2x4+Crx5+Fex3+)O2, up to the x-value of about 006 The Tc increases from 116°C for the pure CrO2 to about 155°C with an Fe-addition of x=006 The magnetic moments of Fe3+ and Cr5+ couple in anti-parallel way to that of Cr4+

Converter for changing alternating current into direct current

Abstract: A converter for changing alternating current into direct current by charging a large-capacity capacitor through a full wave rectification circuit which, together with a transformer, is connected to an AC power supply The output voltage of a voltage divider circuit consisting of the above-mentioned capacitor and a parallel-connected resistor is compared with a predetermined reference voltage by a comparator circuit Then, if the former is lower than the latter, a gate circuit is triggered to put a selfoscillating circuit into a state where it is ready for oscillation, and the oscillating operation of the above-mentioned self-oscillating circuit is triggered through the gate circuit connected to an intermediate point of a closed loop made up of a rectification circuit for rectifying an AC source voltage and of a part of the aforesaid voltage divider circuit, the output of the self-oscillating circuit providing a trigger signal for a thyristor means connected to the aforementioned transformer

Information transmitting and receiving system employing an audio subcarrier modulated by binary signals

Abstract: A system for transmitting and receiving information in the form of television signal wave, wherein there are formed binary numbers each consisting of more than two digits which correspond to letters, symbols or pictures to be transmitted, an audio subcarrier wave is frequency-modulated with electrical signals corresponding to the signals thus produced, an audio carrier wave modulated with said subcarrier wave is transmitted together with a video carrier wave and then received and demodulated, whereby said letters, symbols or pictures are printed.

Electrically luminescent device

Abstract: An electrically luminescent device having an electroluminescent element and associated power supply electrodes, at least one of the electrodes being in the form of a gapped structure consisting of fine metal wires which are arranged in parallel with each other or in a reticulate fashion. In the device, mere coating or placement of a low-resistance substance such as water, an alcohol, a conductive paint or an evaporated metal film on the gap portion of the gapped electrode in such a manner as to conform with the shape of a character or pattern to be displayed can easily attain the luminous display of the character or pattern.

Tape recorder with automatic release from fast speed by sensing pauses between recorded material

Abstract: A tape recorder for detecting a pause portion between signal bands on a tape while the tape is being moved at a higher speed than a tape-playing speed and for playing back a signal band from its beginning. The tape recorder has a tape-moving drive for moving a tape at a tape-playing speed, winding drive for moving the tape at a higher speed than the tape-playing speed, operating linkage for bringing the winding drive into its operative state, holding linkage for holding the operating means linkage at an operative position, a transducing head for reproducing signals recorded on the tape according to movement of the tape, an electric amplifier connected to the head, a detecting circuit coupled to the amplifier to detect a pause portion between signal bands on the tape, an electromagnet responsive to the pause portion detected by the detecting circuit while the tape is being moved by the winding drive, a driving device driven by a motor, and releasing linkage for releasing the operating linkage from the holding linkage upon engagement of the driving device with the releasing linkage so that the winding drive is brought into its inoperative state when the releasing linkage is actuated by the electromagnet upon detection of the pause portion on the tape.

Multi-channel dual-gap magnetic head

Abstract: A multi-channel dual-gap magnetic head. The head has a plurality of magnetic head tips which are separated magnetically from each other by non-magnetic materials, and each having two magnetic gaps. A plurality of magnetic back cores are connected to said magnetic head tips, and a plurality of windings are wound on the respective back cores. The corresponding magnetic gaps in the head tips are aligned in two straight lines which are parallel to each other and perpendicular to the direction of tape movement of the tape for a recording and reproducing device. The magnetic gaps aligned in one straight line have at least two different gap widths for carrying out different functions from among the functions of recording, playback and erasing.

Scanning magnetic head

Abstract: A scanning magnetic head with a closed magnetic circuit including a head gap impressed with a recording signal magnetic field. A pair of closed magnetic circuits respectively including a part of the closed magnetic circuit are provided on the opposite sides of the head gap. The magnetic head is impressed with a pair of symmetrical form of the scanning magnetic fields on the opposite sides thereof so that the influence of the scanning magnetic field on the recording medium may be reduced.

Electric stapler apparatus

Abstract: An electric stapler apparatus comprising an electromagnet provided on the rear undersurface of a base mount and constituting an operating power source, a staple driving lever adapted to be moved upwardly and downwardly by the electromagnet, the forward end portion thereof fixedly securing a staple driving hammer and the rear end thereof being mounted pivotally on the rear portion of the base mount, a staple guide casing positioned in a floating relationship above the base mount, said casing containing inside of the forward end portion thereof U-shaped staples and pivotally mounted at the rear end thereof on the rear portion of the base mount, and a staple clinching anvil rotatably mounted on the front upper surface of the base mount and provided with a pair of staple clinching grooves for clinching inwardly the staples on the upper surface of a flat anvil portion and another pair of staple clinching grooves for clinching the staples outwardly.

A Current Instability in TiO2Thin Film

Abstract: The current instability is observed in the sputtered TiO2 thin films of Au-TiO2-Ti sandwich system under the application of positive bias on Au electrode. The process of the present current instability is studied in relation to the hydrogen ion conduction in the TiO2 thin films. As a result, the process is conjectured as follows: 1) dissociation of adsorbed water at Au-TiO2 interface, 2) injection of H+ into TiO2 at the positive bias, 3) migration of H+ through TiO2 under the applied field. Dissociation of water results from a coarse texture of the film surface. From the current response at the recovery of the current instability, the diffusion activation energy of H+ in the TiO2 films is estimated at 0.07 eV which is in good agreement with the value in TiO2 single crystal.

Multichannel magnetic ferrite head and a method for making the same

Abstract: A multichannel magnetic head consisting essentially of a plurality of magnetic ferrite heads and a plurality of glass spacers filling the spaces between each pair of adjacent magnetic ferrite heads in order to bond said plurality of magnetic ferrite heads into one body. The multichannel head has a high resistance to head-wear and an excellent low cross-talk characteristic and is applicable to various types of multi-track recorders.

System for converting facsimile signals

Abstract: A system for converting facsimile signals, in which an analog facsimile signal is sampled, the sampled signal is compressed into a plurality of intermittently arranged pulse bundles, and the intermittent pulse bundles are converted into a continuous pulse train. The continuous pulse train thus produced is converted into a high frequency signal such as a television signal.

Tape termination alarm device

Abstract: In a magnetic tape recording and/or reproducing apparatus, a device for giving an alarm sounds when the magnetic tape runs out in a tape reel. The device comprises a tension change sensing element adapted to sense a change in tension of the tape, a sound producing member and a rotating body which keeps on rotating even after the termination of the tape feeding, and is operative in such a manner that when the tape feeding is terminated, the tension change sensing element is displaced as a result of a change in tension of the tape at the end portion thereof, thereby bringing the sound producing member into engagement with the rotating body to produce an alarm sound.

Turntable support for a record player

Abstract: A record player having a stationary chassis member and turntable having a turntable shaft. A driving device is coupled to said turntable for rotating said turntable and an air supply device is supported on said chassis member. A stationary turntable supporting member is secured to said chassis member and includes a radial bearing and a thrust bearing supporting said turntable shaft. The radial bearing is a static air bearing having said air supply device coupled thereto. The thrust bearing is a ball thrust bearing for limiting the vertical displacement of said turntable, and is on the bottom of said turntable shaft. Said stationary turntable supporting member is provided with an exhaust port of predetermined size strategically placed at the bottom thereof.

Fractional wavelength folded antenna mounted on portable radio

Abstract: A portable radio device provided with an antenna small sized and not projected from the device for the convenience of handling, which antenna has two polarizations to be made operable almost free from disadvantages in operation due to change in electromagnetic field which are brought about with influences of ambient geographical features or houses.