Abstract: A method of recording information relating to an image photographed on a photographic film in which the photographic film comprises a magnetic track associated with each image frame for magnetically recording the information. Each magnetic track has two or more fields. The information is divided into sections which are each recorded onto any of the fields together with a start signal, an end signal, and an error detection and/or correction signal for each the information section. Consequently, even if the information to be recorded for each image frame is interrupted due to an error in the conveying speed of the film, a portion of the information can be read and utilized.

Abstract: A method for magnetic recording and reproduction comprising the steps of: (1) magnetically multiple-recording signals on a magnetic recording medium comprising a support having thereon an upper magnetic recording layer comprising barium ferrite having an increased coercive force at 60.degree. C. or more and a lower magnetic recording layer comprising at least one of chromium dioxide and Co-modified iron oxide, having a decreased coercive force at 60.degree. C. or more, disposed between said upper magnetic recording layer and said support; (2) heating said magnetic recording layers prior to reproduction due to a reproducing head; and (3) reproducing said magnetically recorded signal from said heated magnetic recording medium which is multiple-recorded.

Abstract: A method for preparing ferromagnetic iron oxide particles comprising the steps of depositing Co-ferrite fine particles onto the surface of acicular iron oxyhydroxide particles and then calcining said acicular iron oxyhydroxide having said C0-ferrite fine particles deposited thereon.

Abstract: A unidirectional traveling-surface-wave by ultrasonic oscillation is generated on a surface of an oscillator, and a magnetic tape is run in the direction opposite to the traveling direction of the surface wave by pressing the surface of the oscillator against a surface of the magnetic tape.

Abstract: A method for preparing ferromagnetic iron oxide particles is described, which comprises depositing a cobalt compound onto a surface of lepidocrostie (.gamma.-FeOOH) particles, and then calcining the particles at 150.degree. to 350.degree. C.

Abstract: A process for recording an information on a surface of a substrate, which includes steps of irradiating the substrate surface with radiation modulated according to the information to be recorded and subjecting the surface of the substrate to a deposition treatment to form deposited areas and non-deposited areas in correspondence with the non-irradiated areas and the irradiated areas, respectively. By this process, a recording density of from 10.sup.8 to 10.sup.9 bit/mm.sup.2 can be obtained.

Abstract: The perpendicular magnetic orientation of a magnetic layer containing platelet-form ferromagnetic particles coated on a web support is effectively performed by passing a web having thereon the coated magnetic layer in an undried state through a magnetic field formed by plural pairs of opposite pole type magnets disposed in the travelling direction of the web with a gap between adjacent pairs of magnets, while supplying drying air through each gap onto the surface of the travelling web to substantially complete the drying of the coated layer while the web is in the magnetic field. A partition may be inserted in each gap so that the lower end of the partition is close to the upper surface of the travelling web to divide the gap into a front section and a back section, and the drying air may be passed through these sections.

Abstract: In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a binder, the ferromagnetic particles are given a magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical mainly to the recording surface. Thus, the vertical magnetization recording is improved.

Abstract: A process for forming an ultrafine pattern on a surface of a substrate, which includes steps of irradiating the substrate surface with radiation modulated according to information to be patterned, subjecting the substrate surface to deposition with a material reactive or not with the substrate, and subjecting the substrate surface to etching if a substrate-reactive material is used for deposition. By this process, an ultrafine pattern can easily be formed with a high accuracy.

Abstract: A magneto-optical disk memory comprises a magneto-optical recording medium constituted by a flexible substrate, and a recording thin film overlaid on the substrate. The recording thin film is fabricated of an amorphous rare-earth transition metal alloy having the easy axis of magnetization normal to the film surface. The magneto-optical recording medium is sandwiched between two hard supporting disks.

Abstract: Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.

Abstract: A magnetic recording medium comprising a substrate, a thin magnetic metal film having spaced-apart columnar grains deposited on the substrate, and an organic polymer formed in the space between the columnar grains and integrated therewith. The medium is prepared by impregnating the spaces between the columnar grains with organic monomers or oligomers and polymerizing them in the spaces.

Abstract: A magnetic recording medium having a thin ferromagnetic metal film formed on a non-magnetic base by vacuum vapor deposition or ion plating is disclosed. The thin ferromagnetic metal film is based on Co and contains 0.05 to 3.0 wt % of Mg.

Abstract: Weather resistance and lubricity of a magnetic recording medium comprising a non-magnetic support having provided thereon a vapor deposited magnetic thin film mainly composed of cobalt, nickel and oxygen can be improved by limiting the amount of nickel and the number of oxygen atoms to a specific value and by providing a plasma polymerized layer on the magnetic thin film.

Abstract: A process for preparing cobalt-modified ferromagnetic iron oxide by modifying ferromagnetic .gamma.-Fe.sub.2 O.sub.3 particles with cobalt, wherein prior to cobalt modification treatment, the ferromagnetic .gamma.-Fe.sub.2 O.sub.3 is heat treated at a temperature in the range of from about -200.degree. C. to +30.degree. C. of the critical temperature at which partial transition of .gamma.-Fe.sub.2 O.sub.3 into .alpha.-Fe.sub.2 O.sub.3 occurs and which reduces the saturation magnetization to 99% of the saturation magnetization measured before the heat treatment, and the atomic ratio of Fe.sup.++ /Fe.sup.+++ after the cobalt modification is 0.00 to 0.10.

Abstract: A process for producing a ferromagnetic metal powder comprising treating acicular iron oxyhydroxide or an acicular metal oxyhydroxide composed mainly of iron with a silicon compound, dehydrating the treated material by heating the material in a non-reducing atmosphere to produce iron oxide particles or metal oxide particles composed mainly of iron, and reducing the resulting iron oxide particles or metal oxide particles composed mainly of iron by heating in a reducing atmosphere to produce iron powder or a metal powder composed mainly of iron, which is characterized in that the dehydration by heating in a non-reducing atmosphere is carried out at a temperature of from 300.degree. to 800.degree. C. and the iron oxide particles or the metal oxide particles composed mainly of iron are treated with a silicon compound prior to reduction by the heating in a reducing atmosphere.

Abstract: Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.

Abstract: The present invention relates to an improved method for preparing a magnetic recording method having excellent magnetic orientation comprising the steps of (1) dispersing ferromagnetic fine particles which are plate-shaped and which have an axis of magnetization perpendicular to the plates of the particles in a binder and (2) coating a magnetic coating layer on a non-magnetic support wherein the method comprises, after coating the magnetic coating layer and before drying it, subjecting the surface of the magnetic layer to a magnetic field from the direction perpendicular to the support to produce a magnetic orientation while contacting the surface of the magnetic layer with a flexible smoothening sheet.

Abstract: In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, an improvement consists in that the ferromagnetic particles have a mean particle length of at most 0.3 microns with a length to width ratio of more than 1 but at most 3 and optionally are subjected to an orientation treatment in a magnetic field in the vertical direction to the recording surface.

Abstract: In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, the ferromagnetic particles are cubic particles of 0.3 or less micron and are subjected to an orientation treatment in the vertical direction to the recording surface, whereby the output and S/N ratio in a high density recording are increased.