Abstract: A thermal head for a thermal recording machine including an insulating substrate which is composed of a printed circuit board made of a heat resistant resin and covered with a copper film, a plurality of thermal resistors disposed on the insulating substrate in the direction corresponding to the scanning, discrete electrodes electrically connecting first ends of the thermal resistors to a control element, a common electrode electrically connecting the other ends of the thermal resistors together, a heat releasing layer formed of the copper film of the insulating substrate on the lower portions of the thermal resistors, and a thermal accumulating layer of a polyimide resin covering the heat releasing layer.

Abstract: A thin film magnetic head includes yokes for leading magnetic flux of signals generated from a magnetic recording medium up to a magnetic resistance effect element. The yokes are made of sputtered films having internal compressive stress therein. The internal stress in the yokes which are deleterious to the magnetic properties of the magnetic resistance effect element can be negated or reduced by including a film of material on the yokes for compensating for the internal stresses.

Abstract: The yoke thin film magnetic head according to the present invention includes yokes for leading the magnetic flux of signals generated from the magnetic recording medium up to the magnetic resistance effect element, which yokes are made of sputtered films having compressive stress therein. Therefore, the internal stress in the yokes which cause bad influences upon magnetic properties of the magnetic resistance effect element can be negated or reduced, with less Barkhausen noises produced.

Abstract: An image sensor includes a light receiving insulating substrate which has a plurality of light receiving elements with one row disposed on one major surface and has a first wiring portion on one side of the major surface for connecting the light receiving elements to a plurality of external driving elements; a driving insulating substrate which has the driving elements mounted on one major surface and has a second wiring portion on one side of the major surface for connecting the driving elements to the light receiving elements; a press-contact connector for electrically connecting the wiring portions, keeping the light receiving insulating substrate and the driving insulating substrate in contact with each other with their respective wiring portions positioned back to back; and engaging means provided close to at least one of the wiring portions in the light receiving insulating substrate and the driving insulating substrate and also provided in the press-contact connector, for enhancing a mechanical holding

Abstract: A planar conductive piece has groups of conductive and insulative lines arranged in mutually crossing directions and formed unistructurally. The individual conductive lines are kept in mutually non-contacting relationship such that the two groups of lines form a planar conductive piece with electrical anisotropy.

Abstract: A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10 .sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..

Abstract: An improved method of manufacturing a thin film magnetic head, which includes the steps of forming an electrically conductive material coil layer on a substrate of a magnetic material, applying onto the electrically conductive material coil layer, an insulation layer of SiO.sub.2, Si.sub.3 N.sub.4, Al.sub.2 O.sub.3 and the like by sputtering, plasma chemical vapor deposition process, etc., and further forming a coating layer of SiO.sub.2 on the insulation layer by spin-coating process for flattening the upper surface of the insulation layer.

Abstract: A thin film magnetic head including a lower yoke made of magnetic material having a high permeability, a magnetoresistive element and an upper yoke for transmitting magnetic flux to the magnetoresistive element. The upper yoke overlaps, at its rear end portion, a front end portion of the magnetoresistive element, while the lower yoke is formed, at its portion confronting the magnetoresistive element, with a groove such that the magnetoresistive element overlaps, at its rear end portion, the lower yoke.

Abstract: A thin film magnetic head which comprises an end portion of a first yoke and an end portion of a second yoke confronting each other through a magnetic gap, and receiving from a recording surface or a recording medium, a magnetic signal, and a magnetic reluctance effect element disposed for magnetic coupling in the course of a magnetic path constituted by the first and second yokes. The thin film magnetic head is characterized in that the first yoke or magnetic reluctance effect element is formed on an application type SiO.sub.2 film which improves the surface roughness of the ground layer.

Abstract: Disclosed is a magnetic head core material having very high corrosion resistance even under severe conditions and a method for preparing the same. The material consists of 3 to 6 wt % of aluminum, 7 to 12 wt % of silicon, not more than 3 wt % of chromium and the substantial balance being iron.

Abstract: A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10.sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..

Abstract: A production method for producing a high permeability alloy film which includes evaporating an alloy material composed of 1-6 wt % Al, 20-35 wt % Si, and the remainder of iron by irradiating the alloy with an electron beam, and then depositing the vapor from the alloy material onto a substrate for a predetermined time to produce an alloy film composition having a high permeability. The vapor deposition onto the substrate is preferably intercepted with the shutter until the concentration of aluminum of the vapor to be deposited has been decreased to a value between 20 and about 4 wt %.

Abstract: There is disclosed a process for modifying in an oxygen plasma an inert reaction product produced on a Fe-Al-Si alloy back core during a production of a thin film magnetic head utilizing a reactive ion etching (RIE) process. As a result of modifying the reaction product it is made readily soluble in and thus removable by water.

Abstract: A process for preparing a soft magnetic film of Permalloy on a rugged substrate in an inert gas atmosphere by a multielectrode sputtering method wherein the target voltage and the target current are independently controllable, the Permalloy film being prepared by:(a) setting the inert gas pressure and the target voltage at values below the critical values where the coercive force of the Permalloy film abruptly increases when the film is formed on a flat substrate, and(b) applying to the rugged substrate during film formation a negative bias voltage not lower than a specific value determined by an angle of inclination formed by a stepped portion in the rugged substrate.

Abstract: There provides a process for preparing a coil type thin film magnetic head having high density record by planarization differences in level caused by an electroconductive coil holded between upper and lower magnetic cores.

Abstract: A thin film magnetic head for detecting, as a change in electric resistance, a change in signal magnetic field to be applied along the magnetization-hard-axis direction of a metal ferromagnetic thin film (MR element) having unit-axis anisotropy, which comprises a ferromagnetic film, which is sufficiently larger in coercive force than the metal ferromagnetic thin film, the ferromagnetic film being disposed on a superposed portion between a lead conductor portion and the metal ferromagnetic thin film (MR element), the metal ferromagnetic thin film (MR element) being coupled in ferromagnetic exchange (MR element) to the ferromagnetic film which is larger in coercive force. The ferromagnetic film is magnetized in a direction longitudinally of the MR element.

Abstract: A method for producing a high magnetic permeability alloy film, wherein an alloy material composed of 1-6 wt % Al, 20-35 wt % Si and the remainder of iron is irradiated with an electron beam in a vacuum deposition apparatus equipped with an electron gun, and the vapor of the alloy material is deposited on a substrate for a predetermined time to form a high magnetic permeability alloy film, comprising further a step of preventing the irregular deposition caused if the concentration of aluminum in the vapor to be deposited increases.