Abstract: An image recording device and an optical fiber are provided which can obtain scanned beam spots having configurations which extend in an elongated manner in a subscanning direction and which are rectangular, and which are suitably used for recording onto a heat-mode-type photosensitive recording material. The image recording device records an image by illuminating a light beam outputted from an exposure head which is connected to a semiconductor laser unit via an optical fiber. In the image recording device, the optical fiber is an optical fiber having a core whose cross-sectional configuration in a direction intersecting an optical axis of the light beam is an elongated and a rectangular configuration. An image is focused by a focusing lens such that a short width direction of a light beam emitted from a light exit portion of the optical fiber is oriented in a main scanning direction on a recording medium.

Abstract: An information recording medium has a semiconductor layer and a ferroelectric layer formed thereon. Information is recorded on the recording medium by locally applying an electric voltage modulated according to the information to the recording medium and then removing it therefrom so that the ferroelectric layer is polarized by an electric charge produced by application of the electric voltage. The electric charge is caused to stay on the surface of the ferroelectric layer for at least 0.1 msec after removal of the electric voltage.

Abstract: An information recording medium has a semiconductor layer and a ferroelectric layer formed thereon. Information is recorded on the recording medium by locally applying an electric voltage modulated according to the information to the recording medium and then removing it therefrom so that the ferroelectric layer is polarized by an electric charge produced by application of the electric voltage. The electric charge is caused to stay on the surface of the ferroelectric layer for at least 0.1 msec after removal of the electric voltage.

Abstract: An information recording medium comprises a semiconductor layer and a layer of a ferroelectric substance overlaid on the semiconductor layer, information being recorded by means of directions of polarization of the ferroelectric substance. The ferroelectric substance is an organic ferroelectric substance, such that recorded information may not be lost during its reproduction and a sufficiently high level of a reproduced signal may be obtained.

Abstract: In an information recording method, a voltage is applied to an information recording medium comprising a semiconductor layer and a layer of a ferroelectric substance overlaid on the semiconductor layer, and information is thereby recorded on the information recording medium by means of directions of polarization of the ferroelectric substance. The value of the applied voltage is set at a value such that a voltage not lower than avalanche breakdown voltage may be applied to depletion layers, which occur in the semiconductor layer. Information is thus recorded quickly.

Abstract: A magneto-optical recording medium comprises a substrate and a magneto-optical recording film overlaid on the substrate. The magneto-optical recording film is composed of a first protective dielectric layer, a recording layer, a second protective dielectric layer, and a reflection metal layer, which layers are overlaid in this order on the substrate. The thickness of the first protective dielectric layer falls within the range of 950 .ANG. to 1,300 .ANG.. The thickness of the recording layer falls within the range of 200 .ANG. to 400 .ANG.. The thickness of the second protective dielectric layer falls within the range of 100 .ANG. to 600 .ANG.. The thickness of the reflection metal layer falls within the range of 200 .ANG. to 800 .ANG..

Abstract: A magneto-optical thin film comprising a substrate having thereon at least two ferromagnetic thin layers alternating with at least two dielectric thin layers to form a laminate the ferromagnetic thin layers each having a thickness of from 30 to 260 .ANG..

Abstract: A microwave device comprises a substrate and fine metal particles having diameters of 0.1 .mu.m or smaller and arranged in a regular pattern on the substrate. In the preferred embodiment of the present invention, the substrate is subjected to electron beam irradiation in a stripe pattern and then a metal or alloy is deposited onto the irradiated area, thereby forming a regular arrangement of fine metal particle deposits which has not been successfully achieved by any prior art technique. The thus obtained device has a greatly improved high-frequency characteristics.

Abstract: A method for recording and reproducing information includes the steps of regularly arranging fine grains having a size less than 0.1 .mu.m on a substrate, which fine grains may be evaporated by being irradiated with electron beams, irradiating predetermined locations of the grain coated substrate by an electron beam modulated in response to information to be recorded by the method, by selectively evaporating fine grains at the predetermined locations irradiated by the electron beam, and irradiating the substrate on which information is recorded with the electron beam to detect the presence or absence of fine grains in order to reproduce the previously recorded information. According to the above described system, large recording densities may be obtained, such as approximately 10.sup.12 bits/cm.sup.2.

Abstract: A method of forming an ultrafine pattern, said method comprising selectively forming adsorption sites on a substrate surface by irradiation with a focused electron beam in a vacuum and then depositing a pattern-forming substance onto the substrate by vacuum vapor deposition, chemical vapor deposition, sputtering or other suitable deposition methods, thereby forming the aimed ultrafine patterns. The method can provide ultrafine patterns in a very high resolution or precision by means of an electron beam irradiation and deposition technique under carefully controlled process conditions and, particularly, the electron beam irradiation in the presence of oil gas results in a better quality of pattern.

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: 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 method for preparing ferromagnetic metal particles is disclosed. The method involves dehydrating oxyhydroxide particles comprised mainly of iron in a nonreducing gas under heating at a temperature of not more than 500.degree. C. to form oxide particles, providing silicon compounds on the surface of oxide particles, and reducing the oxide particles in a reducing gas under heating. The ferromagnetic metal particles provided have good acicular shape and a large specific surface area.

Abstract: A process for preparing a ferromagnetic metal powder and a magnetic recording medium utilizing that powder are disclosed. The ferromagnetic metal powder is prepared by heat-treating an acicular iron oxyhydroxide or an acicular iron oxide powder prepared from the acicular iron oxyhydroxide in a non-reducing gas at a temperature of from 300.degree. C. to 1000.degree. C. or in a reducing gas at a temperature of from 150.degree. C. to 500.degree. C. The heat-treated material is washed and then reduced under heating. The ferromagnetic metal powder prepared in this manner is dispersed in a binder and cated on a non-magnetic base to form a magnetic recording medium. By utilizing the washing step followed by heat-treating preparing the ferromagnetic metal powder a large amount of water soluble impurities are removed from the metal powder. The metal powder produced according to this disclosed process as excellent oxidation stability and ability to resist corrosion.

Abstract: Ferromagnetic metal particles are disclosed, which have a silane compound on the surface thereof. The silane compound is represented by the formula:R.sub.n --Si--(OR').sub.4-nwherein R and R' each represent an alkyl group and n represents 2 or 3. The ferromagnetic metal particles have excellent oxidation stability and corrosion resistance. Furthermore, the ferromagnetic metal particles have good dispersibility within a binder when used in connection with producing a magnetic recording medium.

Abstract: A ferromagnetic powder and process for producing it are disclosed. The process involves providing reducing a nickel-doped or nickel-coated iron compound in a reducing gas to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder, and treating the reduced metal powder with an organic metal powder. The resulting ferromagnetic metal powder has excellent stability with respect to oxidation and has a high saturation magnetization.