Showing papers by "Panasonic published in 1973"

Rotating electric machine with reduced cogging

Abstract: A rotating electric machine of the multipole type which has a permanent magnet rotor magnetized in such a way that the number of stator salient poles is less than the number of permanent magnet poles. The machine has a smaller cogging force and is easily manufactured. The cogging force is made smaller by shaping both sides of the periphery of each stator salient pole. The ratio of the number of the stator salient poles to the rotor permanent magnet poles is such as to make the rotation of the rotor smooth in spite of variations in the magnetization of the permanent magnet rotor poles.

Voltage-nonlinear resistors

Abstract: The invention relates to voltage-nonlinear resistors having nonohmic resistance due to the bulk thereof and more particularly to varistors, which utility as surge absorbers and D.C. stabilizers, comprising zinc oxide, bisumuth oxide, cobalt oxide, boron trioxide and at least one member selected from the group consisting of magnesium oxide, calcium oxide, barium oxide and strontium oxide.

Push button switch with elastic conductive sheet

Abstract: There is provided a push button switch using an elastic conductive sheet having a spherical protuberance which is adapted to be deformed by a keytop for electrically connecting fixed electrodes formed on a printed circuit board. Spring means for returning the keytop is not required, so that the construction is simplified. Also, excellent switching action, operability and reliability can be ensured.

Method of driving liquid crystal display device

Abstract: A method of driving a liquid crystal display device including a liquid crystal layer provided with electrodes on its two opposite surfaces, comprising the steps of applying a first signal for designating the electrode position and a voltage signal having a higher frequency to the electrodes on one surface, and applying and input signal and the signal of said higher frequency to the electrodes on the other surface. The signals are controlled by another signal of different frequency to drive the display device with an ac voltage. Temperature compensation can be performed by varying the magnitude or the frequency of the voltage signal according to the temperature level.

Light modulating device

Abstract: A light modulating device comprising a heterogeneous layer containing an electrokinetically movable liquid material and a solid substance polarizable with respect to the liquid. By establishing an electrical field in the layer the electrokinetically movable liquid is caused to move to vary the transmissivity of the layer to visible light. The electrical field is spatially modulated by electric charges in accordance with an image pattern and the incident light is modulated in exact correspondence with the modulated electrical field. The spatial modulation of the electrical field is effected by the incident ultraviolet light or X-ray radiation or by the impingement of an electron beam in a vacuum chamber.

Process for making a voltage dependent resistor

Abstract: A process for making a voltage dependent resistor which has a zinc oxide sintered body which itself has voltage dependent properties. The process is made up of the steps of: (1) providing a formed body of a powder mixture having as a major part zinc oxide and additive; (2) coating on the side surfaces of the formed body a paste having as the solid ingredient composition at least one member selected from the group of a) more than 50 mole % of silicon dioxide (SiO2), and less than 50 mole % of bismuth oxide (Bi2O3), b) the same composition as that of said additive, c) more than 30 mole percent of antimony oxide (Sb2O3) and less than 70 mole percent of bismuth oxide (Bi2O3), and d) more than 50 mole percent of indium oxide (In2O3) and less than 50 mole percent of bismuth oxide (Bi2O3); (3) sintering the coated body; and (4) applying electrodes to opposite surfaces of the sintered body.

Headphone type FM stereo receiver

Abstract: A FM stereo receiver in the form of a headphone comprising two phone cases and a head belt bridging said two phone cases, said head belt having accommodated therein a tuner including an antenna for receiving FM stereophonic broadcasting, IF amplifier, a discriminator, a FM stereo signal demodulator, a left and a right audio frequency amplifier and power source means for supplying an electric power to said respective elements, so that FM stereophonic broadcasting may be received solely by said receiver without connecting the receiver with external apparatus.

Acceleration sensing device

Abstract: An acceleration sensing device comprising an electrically conductive annular conductive support ring, an electrically conductive sphere to be placed on the upper inner periphery of said support ring, and an electrically conductive contact disposed in the neighborhood of said ball, thereby the device being capable of detecting acceleration in any direction by the use of the electrical conduction between the support ring and the contact through the ball.

Scanning apparatus for a matrix display panel

Abstract: A scanning apparatus for a matrix display panel having a plurality of picture elements at the intersections of X- and Y-line conductors. The scanning apparatus has an X-line driving circuit, Y-line driving circuit, a video signal generator, a timing signal generator, a width control signal generator, a second switching circuit and an analog-to-digital converter. The Y-line driving circuit has a plurality of sets of first memory circuits, a set of second memory circuits, a set of first switching circuits, and a set of brightness control circuits. The scanning apparatus is capable of reproducing moving images having many steps of gray scale from coded video signals having relatively few bits by digital circuits and is also capable of finely controlling the brightness by the efficient use of a horizontal sweep retrace period of the video signals with simplified circuits.

MOS type semiconductor IC device

Abstract: A gate circuit having a plurality of gate inputs, for use in NAND, NOR or ROM (read only memory) circuits which are the basis of all of the logic circuits, comprising a load formed of a resistor or a MOS transistor, a driving stage including a plurality of MOS transistors for a plurality of input signals and having an output terminal, another MOS transistor having a different conductivity type from said driving MOS transistors, and a complementary MOS inverter receiving the output of this gate circuit as the input and supplying the output to the gate of said another MOS transistor of different conductivity type. This structure provides a reduction in the number of interconnections of the constituent elements while achieving low power consumption and high speed operation together with the ease of circuit design.

Catalyst for exhaust gas purification

Abstract: A catalyst for exhaust gas purification comprises a carrier consisting of acid- and high temperature-resistant silica fibers, a first silica layer deposited on surfaces of the silica fibers, and a second heat-resistant material layer deposited on surfaces of the first silica layer, and a catalyst of noble metals, metals or metal oxides deposited on surfaces of the carrier.

Receptacle for printed circuit board

Abstract: A connector which has bellows type contacts of spring metal and a holder which has a bottom, a longitudinal slot for receiving a circuit panel, a cavity for housing the bellows type contact, a hollow formed at upper portion of the cavity and partition wall for separating the adjacent contacts. The bellows type contact consists of a lower end portion, an attached portion, a first bent portion, a second bent portion, a straight portion, a third bent portion and an upper end portion. The straight portion is the portion contacting the panel circuit. The contact has a spring substrate which consists of phosphor bronze, a contact metal of tin or tin-lead alloy, and a layer of copper between the substrate and the contact metal. With the improved shape and material of the contact, there is provided better contact performance even for a contact of tin or tin-lead alloy which is very cheap compared to the conventional gold contact and it is thus advantageous for use in consumer type electric equipment.

Feedback amplifier distortion-cancelling circuit

Abstract: A sound reproducing system, in which sound distortion generated due to non-linear characteristics of amplifier and speaker is detected through operation of motional component of the speaker drive or speaker cone paper and is fed in opposite polarity back to the input side thereby reducing the distortion alone without lowering the efficiency of the amplifier and speaker

Liquid crystal display system

Abstract: A liquid crystal display system comprising a liquid crystal display board, in which the temperature of the liquid crystal or the neighborhood thereof is detected, whereby the liquid crystal is driven with an operating output controlled according to the detected temperature information

Video recording system for reducing flicker in the skip field mode

Abstract: This invention contemplates a field skip recording system for television signals wherein after a portion of an original television signal to be recorded is delayed by an amount equal to a certain integer times a field period, the delayed portion is superimposed on the original television signal to obtain a mixed television signal. Signals each of which is a certain integer times one field are successively sampled at an interval of a certain integer times one field so as to be recorded, thereby reducing flickering in pictures reproduced by field skip recording.

Rotating air bearing head with shaped control slots

Abstract: A magnetic recording and reproducing device is disclosed in which one magnetic head or a plurality of magnetic heads are so disposed upon a rotary drum as to extend beyond the outer peripheral surface thereof with the slit gap or gaps in parallel with the axis of rotation of the rotary drum. Recesses are formed on both sides of the magnetic head in the outer peripheral surface of the rotary drum, and the point of the maximum thickness of the magnetic head which is generally similar in cross sectional configuration to an airfoil is located ahead of the midpoint or center of the magnetic head but behind the leading edge thereof. Both side edges of the magnetic head are rounded between the trailing edge and a point very close to the slit gap thereof.

Water jacket temperature sensor

Abstract: A plurality of thermistors extend transversely of and are disposed longitudinally in an axial bore of a metal housing having a closed end and an open end. A plurality of spacers are provided for electrically isolating the thermistors and biasing springs urge the thermistors toward the closed end to establish a thermally conductive path therebetween. Conducting wires extend through the bore to establish connections to the thermistors to provide individual thermally responsive resistive circuits. The open end portion of the housing is filled with an insulating mould cap to provide fluid tight sealing.

High voltage generator for a television receiver

Abstract: A high voltage generator comprising a high voltage generating transformer having a primary winding and first and second secondary windings, a first rectifier having one end connected to one end of the first secondary winding, a capacitor connected to the other end of the first rectifier and adapted to be charged with the voltage appearing at the other end of the first rectifier, a second rectifier connected between the connection point between said first rectifier and said capacitor and one end of the second secondary winding, and a third rectifier for high voltage rectification connected to the other end of the second secondary winding. With this construction variation of the output high voltage with change in load current can be reduced.

Foldable hair dryer

Abstract: A foldable hair dryer consisting of a hollow nozzle assembly made up of a cylindrical portion and tangentially extending nozzle coaxially fitted into a handle assembly having a cylindrical portion and tangentially extending handle, the two assemblies being generally symmetrical. The thickness of the nozzle, handle and their associated cylindrical portions, measured axially, is approximately the same resulting in a compact, "flat" construction. Within the cylindrical portion of the nozzle assembly is mounted a motor and fan assembly also of "flat" configuration in which the blades of the fan are peripherally disposed about the motor. The nozzle is fitted with a heating element. The nozzle and handle assemblies are coaxially pivoted for movement between an operating condition in which the nozzle and handle are in "L" configuration and a collapsed condition in which the nozzle and handle lie compactly side by side. A switch on the handle is operated by the nozzle incident to the collapsing movement to insure that the motor and heating element are both turned off in the collapsed state.

Fastener feeding apparatus drive control means

Abstract: A drive control means by which headed parts such as screws or other fasteners contained in any order in a bulk supply means such as a hopper are supplied continuously in a required alignment to a distributor, and supplied individually from the distributor to a power operated fastening tool. The drive control means has sensing elements which detect when the fastening tool requires a fastener to be supplied thereto, and actuates the distributor to supply a fastener accordingly, and which detect the state of supply of fasteners to the distributor, and actuate a means to supply fasteners from the bulk supply means only when necessary, whereby a constant reserve is maintained in readiness for immediate supply to the distributor and to the fastening tool. The entire drive control means is operated from a single source of pneumatic power, and may be used directly in association with feeding apparatus for fasteners of different sizes.

Transducer cleaning unit

Abstract: A transducer cleaning unit is disclosed for use in a magnetic tape recording and/or reproducing apparatus utilizing a tape housed in a container, which is provided for cleaning a magnetic tape recording and/or reproducing head thereby avoiding a possible reduction of the output characteristic of the magnetic head. To this end, the cleaning unit comprises a solid block movable between elevated and descended positions and carrying a cleaning piece which sweeps the magnetic head during movement of the solid block from the elevated position to the descended position and/or from the descended position to the elevated position. This movement of the solid block is effected in response to the placing of the container within the tape receiving chamber of the tape recording and/or reproducing apparatus.

Phosphor for thermoluminescent radiation dosimeter

Abstract: This has the accumulation effect of radiation energy and is mainly used as the element for thermoluminescent type radiation dosimeter It has as the principal constituent a phosphor consisting of calcium sulfate as the principal constituent and other impurity elements such as dysprosium, thulium and the like It is more sensitive by the order of 1-2 or more figures than the conventional ones and is excellent in the retention of absorbed radiation energy

Dichromatic thermo-sensitive recording paper

Abstract: Recording paper which forms, for example, a red color when scratched with a thermal pen or head at a certain temperature and which forms, for example, a blue color when scratched with a thermal head at a higher temperature, said dichromatic thermosensitive paper having first and second layers formed from a dispersion in a film-forming binder of discontinuous particles of a leuco base of triphenylmethane or fluoran type dye and a phenolic acidic substance or an organic acid; and, disposed therebetween an inter layer capable of being thermally fused to dilute as well as to exclude the color formed in the first layer.

Lattice Vibrations of Mg x Cd 1-x Te Mixed Crystals

Abstract: Infrared and Raman measurements of lattice vibrations in Mg x Cd 1- x Te mixed crystals have been made in the concentration range x =0∼0.6. The modified random-element isodisplacement model has been applied to explain the concentration dependence of long wavelength longitudinal and transverse optic phonon frequencies in the mixed crystal system. From fitting the computed values to the experimental data we have estimated the static dielectric constant e 0 , TO and LO phonons of pure MgTe, and a gap made of Cd in MgTe.

Discharge lamp starting apparatus

Abstract: A discharge lamp starting apparatus comprising a hot cathode start fluorescent discharge lamp having a cathode at each end thereof, a pulse generating circuit consisting of a pulse transformer connected to one of the cathodes of the discharge lamp and having a primary winding and a secondary winding, a first capacitor, a first bi-directional diode thyristor and a resistor, a circuit portion for increasing preheating current to the cathodes including a diode and a second capacitor which are connected in parallel with a circuit of the first bi-directional diode thyristor and the resistor, and a second bi-directional diode thyristor adapted to be turned off upon operation of the discharge tube and connected between the diode, the resistor and the second capacitor, on one hand, and the other cathode of the discharge tube, on the other hand.

DC EL materials and techniques for flat-panel TV display

Abstract: The preparation and properties of direct current electroluminescent (dc EL) materials using manganese-activated ZnS powders for a flat-panel TV display are described The firing process, the copper coating process, and the ferming process have been investigated Suitable powder phosphors for the display panel contain 01-05 wt % manganese and 025-035 wt % copper coated on the ZnS powder surface Although the powder-type dc EL still has low luminous efficiency, the light output can be increased to a useful level by exciting the panel with voltage pulses of high peak power The crosstalk effect in the display panel can also be suppressed, since the brightness is very nonlinear with respect to the applied voltage The sealing of the panel with silicone oil is effective in lengthening the life of the panel An experimental dc EL panel with a 13-in diagonal and 50 176 picture elements has been fabricated, capable of reproducing broadcast TV images These images have a highlight brightness of 10 fL, a contrast ratio of 20:1, a limiting resolution of about 150 TV lines in both horizontal and vertical directions, and a gray-scale capability of 16 steps

Multi-channel magnetic head with offset gap lines

Abstract: A multichannel magnetic head is provided with two offset gap lines formed in the face of the core tips. Non-magnetic material insulates adjacent core tips, and cross-talk is reduced by an over-lapping core construction. Various length back cores are provided to minimize the head size; but reluctances are equalized by varying core material, core cross-sectional area, or the gap between the back and the tip cores.

Ultrasonic generator and burner

Abstract: An oscillator drives an ultrasonic transducer by rectangular waveform voltage. An automatic resonant frequency tracking system is provided in which the driving voltage is positive-fed back to the oscillator, and a system for controlling the amplitude of oscillation is provided by the negative-feed back of the driving voltage to a DC power source for the oscillator.

Auto exhaust control catalyst on silica cloth support

Abstract: A catalyst for purification of exhaust gas from automobiles comprises silica cloth having a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent as a substrate, the silica cloth being prepared by dealkalizing glass fiber cloth with an acid to a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent, and heating the dealkalized glass fiber cloth at 500 DEG to 1,100 DEG C to recrystallize surfaces of the cloth once through semi-melting, 0.1 to 10 wt. percent of at least one of inorganic powders consisting of gamma -alumina, magnesia, silica, titania, and zirconia and 0.01 to 20 wt. percent of at least one of platinum, palladium, rhodium, ruthenium, cobalt, iron, nickel, copper, manganese, and chromium as a catalytic material, said inorganic powders and catalytic component being borne on the silica cloth. The catalyst is prepared by dealkalizing glass fiber cloth with an acid to a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent, heating the dealkalized glass fiber cloth at 500 DEG to 1,100 DEG C, thereby recrystallizing surfaces of the cloth once through semi-melting, dipping the cloth in an aqueous or an aqueous alcoholic solution containing at least one of inorganic powders of gamma -alumina, magnesia, silica, titania, and zirconia and at least one of salts of platinum, palladium, rhodium, ruthenium, cobalt, iron, nickel, copper, manganese and chromium as a catalytic material, drying the silica cloth at 40 DEG C to 120 DEG C and calcining the same at 300 DEG C to 400 DEG C for 30 minutes to 2 hours.

Electromagnetic relay structure

Abstract: A structural arrangement is provided for an electromagnetic relay having an armature, coil means, contact means including contact terminals and fixed contacts, and a coil holder body having the armature located therein and being composed of two substantially exactly interfitting and interconnected parts. One part of the coil holder body is formed as a contact holder with the contact terminals and the fixed contacts embedded therein. The other of the two parts of the coil holder body is formed as a cover member configured to at least partly define a contact containing chamber for the relay structure. Alternatively, the two parts of the coil holder body may be formed to essentially consist of two identically constructed contact holders. Additionally, the coil holder body having the armature located therein may be formed in an undivided integral construction with portions adapted to serve as contact holders and containing therein fixed contacts, as well as contact and winding terminals molded to flanges of the integral coil holder.