Showing papers on "Magneto published in 1983"

Writing, erasing and readout system for a magneto-optic recording medium

Abstract: A writing, erasing and readout system for a magneto-optic recording medium capable of achieving switching rates approaching the laser pulse rate, including plural diode lasers operating through a single optical path and cooperating with bi-polar magnetic field producing means located adjacent to and on the opposite side of the magneto-optic medium.

Contactless magneto ignition system

Abstract: A flywheel magneto generates a first and a second angular signal in synchronism with the rotation of an internal combustion engine so that the second signal is broader in pulse width than and delayed by a predetermined time interval relative to the first signal. An ignition time calculation circuit converts the first signal to a rectangular pulse. The second signal is partly bypassed to ground until the pulse is ended in the high and moderate speed ranges of the engine. At the end of the pulse, the second signal cause a thyristor to conduct so as to determine an ignition time. In the low speed range, the pulse is disabled and the second signal cause the thyristor to conduct upon its reaching the threshold voltage of the thyristor.

Contactless ignition device for internal combustion engine

Abstract: PURPOSE:To perform ignition in a position of maximum voltage at a low speed while in a position advanced from the position of maximum voltage at a high speed, by controlling a main switching element in an ignition device through a control circuit, controlling its cut off point with two semiconductor switching elements and interposing the semiconductor switching element in said control circuit. CONSTITUTION:At a low speed, if forward voltage is generated in a magneto 1, a main switching element 3 is electrically conducted to flow a current through a resistor 4. Then an auxiliary switching element 9, electrically conducted to flow a current through a capacitor 12, is cut off at a point exceeding a maximum value of voltage, as a result, a control switching element 5 is electrically conducted to flow a current through a resistor 8, and the main switching element 3 is cut off at a point of maximum voltage. While at a high speed, an electric current flows through the resistor 4 by generated voltage in the magneto 1 and electrically conducts to flow a current in a control switching element 5, and the main switching element 3 is cut off before maximum voltage. In consequence, an ignition spark can be obtained in a point of maximum voltage at the low speed, while in an advance point earlier than the point of maximum voltage at the high speed.

Magneto-optics of cadmium arsenide

Abstract: Using the band structure model of Bodnar (1) we have calculated the frequency and wave-number dependent electronic dielectric tensor of Cd3As2 in the presence of a magnetic field, for arbitrary direction of the field relative to the c-axis of the crystal. This involves calculating not only the energy levels but also the 8-component wave functions and the current matrix elements. The magneto-optical properties of the material in both the Faraday and Voigt configuration are discussed on the basis of this calculation.

Magneto-resistance device

Abstract: PURPOSE:To generate in a stable state a signal by a variation of a magnetic field, by constituting a titled device so that a bias magnetic field of the forward and backward directions is applied and set to the first and the second magneto- resistance elements, respectively, and an output signal is fetched from a connecting point part of the first and the second magneto-resistance elements CONSTITUTION:The first and the second magneto-resistance elements 12, 13 are formed by vapor-depositing and forming a thin film by a ferromagnetic material consisting of, for instance, an Ni-Fe alloy thin film, on an insulating substrate 11 constituted of a silicon oxide film, etc, and etching this vapor- deposited thin film As for the insulating substrate 11, the first and the second magnets 17, 18 are set so that a magnetic field is applied and set to the first and the second magneto-resistance elements 12, 13, in each crossing direction The first and the second magnets 17, 18 are set to the first and the second magneto-resistance elements 12, 13, so that the magnetic field of the forward and backward direction is operated That is to say, with respect to the first and the second magneto-resistance elements 12, 13, the bias magnetic field of the direction opposite to each other is applied

Magneto-electric pulse generating device

Abstract: Magneto-electric devices producing an electrical signal in response to a change in a magnetic field may preferably produce uniform pulses independent of the rate of change of the magnetic field. Devices of this type have been made using the so-called Wiegand effect, but such devices are not as sensitive as those used having amorphous magnetic material. Devices made of ferromagnetic metallic element (13) usually have essentially amorphous structure which has been plastically deformed by cold deformation, are more likely to prevent a device from responding to strong magnetic fields such that these devices are more sensitive. Among those devices having a ferromagnetic element are keys, credit cards and proximity sensors.

Magneto-optic Transducer Optimization in a Laser Current Transformer

Abstract: Conventional methods of current measurement pose certain serious limitations especially when the line voltage increases to the EHV range. In this context, laser current measurements in EHV lines are not only advantageous in terms of accuracy, stability and robustness but also results in a substantial cost reduction and compactness. This technique employs the magneto-optic effect where in a laser beam is directed towards a transducer placed near the line [1]. An attempt is made to optimize the dimension of the transducer for maximum sensitivity by applying the standard optimization techniques using a digital computer. These results are presented and discussed in this paper.

Remote control type hydraulic pump unit

Abstract: PURPOSE:To enable to perform a control from a remote position, by a method wherein, in a pump unit driven from a magneto ignition type engine, an electromagnetic valve is actuated by the power of the magneto for igniting the engine. CONSTITUTION:A small-sized engine E, which can be fired by a magneto M, and a hydraulic pump P are installed, a hydraulic compressor C and a switch S are mounted on a steel tower, and the magneto M is provided with an igniting magneto and a lighting magneto. If an operator, stationed on the steel tower, depresses the switch S, an electromagnetic valve 1 is excited through a receiver R and is switched, and oil in a pilot pressure pump P1 flows to a switching valve 2 to switch the valve 2. This permits the control of a switching by a very small power, and the miniaturization and lightening of a total unit.