Showing papers on "Magneto published in 1982"

Magneto-optic disk storage

Abstract: Recent researches on materials and systems for magneto-optic disk storage are reviewed. An amorphous double-layered GdCo film is suitable to use for this purpose. An experimentaI result on recording color TV signals in real time on a GdCo disk is also presented. Fairly good motion pictures were reproduced. From this work, it can be said that magneto-optic disk storage system will be put into practice in the near future.

Magneto powered ignition system with ignition-operated speed limiting

Abstract: Voltage halfwaves generated by a magneto in one polarity are utilized for powering and timing ignition of an internal combustion engine, and voltage halfwaves of the opposite polarity, taken from the circuit of the primary winding, are utilized both to feed a regulated d.c. voltage source for a timing circuit and to provide a recurring trigger voltage for a monostable circuit that keeps the ignition control circuit operative only so long as the speed of the engine does not exceed a predetermined limit. The monostable circuit is constituted by appropriate connecting up of an available timer integrated circuit unit.

Low noise sensitivity magneto-electrical distance transducer - has distance and direction transducer pairs on permanent magnet, typically cobalt samarium alloy

Abstract: A magneto-electrical distance transducer has a toothed element moving on a linear or circular path and a magnetic sensor which converts its motion into periodic electrical signals via detection of magnetic field strength variations. The arrangmenet exhibits low sensitivity to noise from mechanical vibrations and external magnetic noise fields. The sensor contains two pairs of magneto-electrical transducers (10,20) mounted on a permanent magnet (30), one (20) for direction and one (10) for displacement measurement. The displacement measurement transducer pair (10) is placed on the axis of symmetry of the equipotential field profile of the permanent magnet. The permanent magnet is a cobalt samarium magnet whose pole surface is large compared to the effective measurement surfaces of the transducer pairs. The transducer pairs may be in the form of pairs of field plates.

Magneto resistive device

Abstract: PURPOSE:To promote detecting sensitivity by arranging four mageto resisitve segments at square positions. CONSTITUTION:Magneto resistive segments 11, 13 are disposed to be extended along along a lateral direction and magneto resistive segments 12, 14 are disposed to be extended along a vertical direction. Each magneto resistive segment is disposed in zigzag form but a disposition in which straight magneto resisitve segments are arranged at square positions and joined by connection is satisfactory according to the principle. Each magneto resisitive segment 11-14 is arranged into bridge circuit which have each one as a side. If a magnetic field parallel to the surface is applied each magneto resistive segment 11, 13 have an equal change in resistance and each magneto resistive segment 12, 14 have an equal change in resistance. Accordingly a twice voltage can be obtained comparing a voltage gained from a bridge circuit consisting of two magneto resistive segments and resistances.

Magnetization of permanent magnet

Abstract: PURPOSE:To efficiently magnetize the magnetized directions of adjacent magnets in the opposite direction respectively by a method wherein permanent magnets mutually arranged in parallel are magnetized in one direction and next, a part of the permanent magnets is magnetically shield to magnetize in the opposite direction. CONSTITUTION:A substance fixing permanent magnets 1 and 2 to a nonmagnetic base substrate 3 in parallel is arranged between the magnetic poles of electromagnets 4, 4' serving as magnetizers. Next, a pulse current is flowed to the exciting coils of the magnets 4, 4' and two magneto pieces 1 and 2 are magnetized in the same direction. After that, a high-permeability magnetic substance piece 5 is inserted and arranged between the magnets 4, 4' so that a closed magnetic circuit may be composed at the magneto piece 2 and the magneto piece 2 is magnetized by flowing a reverse pulse current to the exciting coils of the magnets 4, 4' so that the magneto piece 2 may be magnetized in the pole direction which is different from the previous case. In this way, the magnetized directions of the adjacent pole pieces of the permanent magneto pieces closely arranged in parallel can be in the opposite direction respectively.

Magneto-resistive effect type thin film magnetic sensor

Abstract: PURPOSE:To improve accuracy for temperature compensation by disposing a permanent magnet in a close contact with a magneto-resistance effect sencor in a compensating region for temperature CONSTITUTION:A magneto-resistive element 2 in a sensing region and a magneto resistive element 3 in a compensating region for temperature are so arragned that their axes are perpendicular to each other By a permanent magnet 9 disposed above the element 3 and by a strong magnetic field 10 of the magnet 9 applied on the element 3, a current flowing in the element 3 is confined in a direction 8 far from the axial line Accordingly with a resistance of the element 3 being kept constant by an external signal magnetic field, a thin film magnetic sensor which has a good temperature compensation and linearity is obtained Besides when a permanent magnet 11 is formed by thin film deposition method on the magneto resistive element 3 of the temperature compensation region so as to take a same form, a magnetic flux leaking outside is made very low Besides, when a magnetized direction of the permanent magnet 11 and an axis of easy magnetization of the element 3 are brought into a coincidence, a magnetization direction of the element 3 is stabilized and confined referring to a magnetization signal, and a bias magnetic field is unnecessary for the element 2

Magneto resistive element

Abstract: PURPOSE:To make temperature characteristics better and manufacture facile by a method wherein a ferromagnetic material is used as a magneto resistive segment and it is organized as a thin film CONSTITUTION:An insulating film 12 consisting of silicon dioxide is formed through heating a surface of a silicon wafer to a high temperature and feeding oxygen After a thin film is built by evaporation of a ferromagnetic material (such as Ni-Co alloy or Fe-Ni alloy etc) on it, a chip 14 is built by forming a necessary pattern 13 The chip 14 is attached on an insulating substrate 15 Electrodes 16-18 are prepared previously using metalization on the insulating substrate 15, and each tip of the magneto resistive segments 13 on the chip 14 and connecting points are connected by wire bonding