Abstract: An information recording medium which is composed of a substrate and a recording layer formed thereon to record information by means of the change in atomic arrangement induced by irradiation with light, said recording layer having at least one interface layer laminated at its interface. It is superior in recording-reproducing-rewriting characteristics and archival life.

Abstract: To provide a disk drive system provided with an inertial latching mechanism which has high reliability and can be arranged in a thin-model disk drive system. There is provided an inertial arm (7) engaging an actuator (22) when a head arm (25) is in or near a parking position and releasing engagement with the actuator (22) when the head arm (25) is in or near a position close to a disk (1) and energizing means for holding a position of the inertial arm (7) in a position where the engagement with the actuator (22) is released. Even if a rotational shock is externally applied when the actuator (22) remains in the parking position, moment of rotation is applied on each of the actuator (22) and inertial arm (7) in the same direction, the actuator (22) and inertial arm (7) mutually restrain their operations at an engaging part, and the oscillation of the actuator (22) to a data area can be avoided.

Abstract: An information recording medium having a substrate, a lower superficial layer formed on the substrate and having a thickness of not more than 25 nm, and a recording layer formed on the lower superficial layer. Information is recorded on the recording layer in accordance with a change of atomic arrangement caused by irradiation of light. The information recording medium includes and an absorption control layer formed on the recording layer.

Abstract: A phase change optical disk medium includes a disklike substrate, and a recording layer formed by a laminate of a plurality of thin layers including a phase change layer. Information marks are recorded on the phase change layer by phase changes from a crystal phase to an amorphous phase and vice versa. The recording layer has tracks for recording information marks formed by groove portions and land portions respectively taking alternate concave and convex shapes. The track has an interval in range of 0.54 to 0.64 &mgr;m and the recording layer has a ratio of the optical reflectance of 0.35 or less when the phase change layer has changed to the amorphous phase in case where the optical reflectance of the recording layer is 1 when the phase change layer is in the crystal phase.

Abstract: A high-density information recording medium free from lowering the reflectance by over-write of a large number of times and exfoliation defect in a structure for suppressing cross-erase. This medium includes, over a substrate having a groove shape, a recording layer, and three-layered thin films of a first interference layer, a second interference layer and an interface layer having mutually different compositions and disposed on a laser beam incidence side of the recording layer in order named from the laser beam incidence side. The first interference layer has a smaller refractive index and a larger thermal conductivity than the second interference layer, the interface layer is interposed between the second interference layer and the recording layer, and a distance between the first interference layer and the recording layer is greater than at least a groove depth.

Abstract: A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length.

Abstract: The object is to hold the recording, reproduction and rewrite characteristics better than in the prior art. An information recording medium comprises an information recording thin film as a recording layer formed on a substrate for recording and/or reproducing information by the change in the atomic arrangement caused by the radiation of light. The medium further comprises at least one protective layer. The protective layer and the recording layer are formed in that order from the light incidence side, followed by forming at least one absorption control layer, thereby exhibiting a superior rewrite characteristic.

Abstract: A voice coil motor capable of quickly and precisely positioning a magnetic head with high precision is provided with a bearing rotatably supporting a head carriage without being influenced by a radial load. Two coils having radial sections contributing to generate a torque are provided to be rotatable in a magnetic space formed by a permanent magnet and a pair of yokes, and are layered along a central rotating axis in such a manner that an extension angle of the radial sections of one coil differs in direction from that of the radial sections of the other coil. When electric current flows, no radial load works, and a resultant force generated in these coils can be a couple of forces in the direction vertical to the movement direction of the magnetic head, so that the magnetic head can be quickly positioned with high precision, realizing a small magnetic disk device.

Abstract: Optimum edge recording methods are previously held in a control data zone on the recording medium, and one of the methods is selected in a write mode by referring to the recorded methods. An information recording apparatus for forming a recording mark by converting an energy beam to a multi-pulsed train and irradiating the beam onto the recording medium includes that change-over can be realized between mark edge control based on control of both pulse edge positions and mark edge control based on control of one of the pulse edge positions.

Abstract: An information recording medium which includes at least a recording layer, and first and second metallic layers disposed on an opposite side of an energy beam incident side of the recording layer and having different compositions, and in which the first one of the first and second metallic layers located closer to the recording layer contains Al, Ag, Au, Pt and Pd as its main components and a sum of contents of these atoms is 60% or more. Thereby recording and reproducing of information can be realized with a high reliability.

Abstract: A phase change optical disk medium includes a disklike substrate, and a recording layer formed by a laminate of a plurality of thin layers including a phase change layer. Information marks are recorded on the phase change layer by phase changes from a crystal phase to an amorphous phase and vice versa. The recording layer has tracks for recording information marks formed by groove portions and land portions respectively taking alternate concave and convex shapes. The track has an interval in range of 0.54 to 0.64 .mu.m and the recording layer has a ratio of the optical reflectance of 0.35 or less when the phase change layer has changed to the amorphous phase in case where the optical reflectance of the recording layer is 1 when the phase change layer is in the crystal phase.

Abstract: An information recording medium which comprises as a recording layer an information recording thin layer, formed on a substrate directly or via an underlayer, which records and/or reads back information through the use of atomic arrangement change caused by the irradiation of energy beams, a protective layer and at least two reflective layers, the reflective layers including a first reflective layer and a second reflective layer, the materials of which differ in refractive index or extinction coefficient or both, the aforesaid layers being laminated in the order, from the side of light incidence, of the protective layer, the recording layer, an intermediate layer, the first reflective layer and the second reflective layer.

Abstract: A recording apparatus includes a recording medium, a frequency modulator for conducting frequency modulation on a digital-modulated signal to generate a recording signal, and a recording unit for recording the recording signal on the recording medium.

Abstract: A method of manufacturing an electronic part includes a step of preparing a molten resin bathtub used for coating the outer surface of the electronic part. On a surface of the resin in the molten resin bathtub, a layer of a surface-active agent is formed. The electronic part body is dipped via the solvent layer into the molten resin bathtub. After coating the electronic part body with the molten resin, the electronic part body is removed from the molten resin bathtub. The molten resin is cured by heating and the resin layer is formed on the electronic part body.

Abstract: A masking type light control layer for decreasing its reflection factor in a high-temperature region is formed on phase pits of an optical disc, and the phase pit depth is set to a predetermined value. A light spot for reproduction is shaped to an elliptical form and two sub-flux beams on the optical disc are spaced by 5/4 track pitch from a principal flux beam in the radial direction of the optical disc. The kind of optical disc is discriminated and reproduction laser power and characteristics of an equalizer circuit are switched in accordance with the type of an optical disc. Through this, a stable servo signal detection can be ensured and repetitive reproduction characteristics can be improved.

Abstract: A magneto-optical recording medium comprising, on a substrate, at least a first magnetic layer made of a rare earth amorphous alloy and a second magnetic layer made of a rare earth amorphous alloy having a relatively smaller coercivity Hc.sub.2 than that of the first magnetic layer, wherein the following relationship is satisfied at an operation temperature:Hw.sub.1 -Hexc.sub.1 >Hc.sub.2 -Hexc.sub.2where Hw.sub.1 represents the magnetic domain wall coercivity of the first magnetic layer, Hexc.sub.1 represents the magnitude of the exchange magnetic field exerted on the first magnetic field and Hexc.sub.2 represents the magnitude of the exchange magnetic field exerted on the second magnetic layer is used, to obtain a magneto-optical recording medium with no increase in the noises by overwriting, and without reduction of C/N ratio after repeating recording for a number of cycles, a recording method and overwriting method using the media and a magneto-optical recording device.

Abstract: A phase change optical disk in which the thermal conductivity of a first region at an outer peripheral position of the disk is set at a value larger than the minimum value of that of a second region. In the optical disk, in order to provide an output characteristic of a uniform reproduced signal when the disk is rotated at a fixed rotation speed, toward an outer peripheral position thereof, the critical cooling rate of a recording film is set at a larger value or the temperature which the recording film is to reach is set at a lower value. Provided is a method of using the phase change optical disk for recording or erasing information, in which method, the power of the laser beam to be directed to an inner peripheral position of the disk is set larger than that directed to an outer peripheral position thereof.

Abstract: According to this invention, since the range of power necessary for erasing an overwritable magneto-optical recording medium is set to 2.5 mW or above, overwriting is possible without erase residue due to mark (magnetic domain) diameter difference, tracking offset, ambient temperature variation and characteristic dispersion between magneto-optical recording media and thus the magneto-optical recording medium has high reliability. Moreover, the rate of change, K of the switching field of the memory layer relative to temperature at around an erase start temperature can be controlled to be a constant value so that an erase power margin can be increased and that the tolerance to the reading light when the ambient temperature rises can be improved.

Abstract: A gaseous-discharge lamp has a valve defining an interior of the lamp in which an inert gas, such as xenon, is confined. A cup-shaped reflector is disposed in the interior of the lamp, whose inner surface cross-section is preferably a hyperbola or an ellipse so that a collimated light spot is projected outwardly of the lamp or a focused light beam is available. The reflector has a larger-diameter opening facing a light projection window formed on one face of the valve and a bottom portion formed with a hole. An anode and a cathode are disposed in confrontation with each other in a space surrounded by the reflector. A trigger probe electrode intervenes between the anode and the cathode. A sparker electrode is disposed outside of the reflector and in the vicinity of the hole formed in the bottom portion thereof. By the provision of the reflector in the interior of the lamp, light of high radiation intensity is produced from the lamp without increasing the size of the lamp.

Abstract: Method and apparatus for detection of oil mists in which oil mists in a noninflammable gas an formed into deposits by heat decomposition, an accumulated amount of the deposit is detected as a variation of electric resistance, and the amount of oil mists is detected from the electric resistance value. The apparatus includes a power source for energizing a heating member, a circuit for detection of an electric resistance between electrodes, and a display circuit for indicating an output of the detection circuit as an amount of oil mists.