Abstract: A process for forming an electrode assembled into a vacuum interrupter is composed of the steps of blending silver(Ag) powder and chromium(Cr) powder in a content ratio such that Ag powder forms a matrix and Cr powder being dispersed therein, the blending ratio is prefer to be determined to contain 50 to 95 wt. % of Ag powder and 5 to 50 wt. % of Cr powder, compacting the blended powder to a compacted body, sintering the body at temperatures around melting point of Ag, and regulating density of the sintered article at least 90%. Particle size of Cr to be blended may be determined less than 150 .mu.m, more preferably, less than 60 .mu.m. Sintering temperature may be determined between 800.degree. to 950.degree. C.

Abstract: A method for forming an electrical contact material comprises the steps of melting a mixture of Cu and Cr into a molten alloy, atomizing the molten alloy into fine particles to obtain alloyed particles. Cr particles in the alloyed powder disintegrate to less than 5 .mu.m in mean particle diameter. The alloyed powder is sintered thereafter and a mean particle diameter of chromium in the sintered article is fined in a range of 2 to 20 .mu.m. An electrical contact material is composed of a copper matrix and chromium particles having a mean particle diameter of 2 to 20 .mu.m. The chromium particles are homogeneously dispersed in the copper matrix.

Abstract: An all-directional optical sensor apparatus 8 includes an all-directional prism 20 which has a cylindrical-shaped body with a hollow-out cone section formed in its top surface 22. The surface 28 of the cone works as a reflector 30 for rays received through side surfaces 24 of the cylindrical-shaped body. An optical sensing element is disposed adjacent to a bottom surface 26 of the prism 20. A roof plate 40 having a dimension larger than the top surface 22 of the prism is arranged for shielding the entry of any light other than an input signal into an upper portion of the prism 20.

Abstract: An optical disk apparatus in which a head is accommodated in a movable part which moves the head along a guide shaft in a radial direction of an optical disk. The guide shaft is engageable with the movable part and extends in the radial direction of the optical disk. The optical disk apparatus has a guide shaft compression mechanism which applies a compression force toward the movable part, which force is distributed, approximately uniformly, along the radial direction of the optical disk, to the guide shaft so that the movable part can be properly engaged with the guide shaft so as to move smoothly and stably along the guide shaft in the radial direction of the optical disk.

Abstract: A process for forming contact material of an electrode comprises the steps of preparing chromium of which oxygen content is substantially reduced, forming a molten mixture of the chromium and copper, atomizing the molten mixture into fine particles to obtain Cu-Cr alloyed powder, compacting Cu-Cr alloyed powder under desired pressure, and sintering the compacted alloyed powder. The oxygen content of the chromium may be reduced until less than 0.1 wt %. In a course of the process, a metal having melting point lower then copper may be blended. The metal may be blended in Cu-Cr alloyed powder, or blended in the molten mixture of copper and chromium. Alternatively, the process further includes the steps of forming a second molten mixture of copper and a metal having melting point lower than copper, atomizing the second molten mixture into fine particles to obtain alloyed powder of copper and the metal, and blending Cu-Cr alloyed powder with the alloyed powder of copper and the metal.

Abstract: A disk storage device includes a head part which writes data into a storage disk loaded into the disk storage device and reads data from the storage disk, a linear actuator moving the head part in radial directions of the storage disk, an eject member which is operated when the storage disk is ejected, and a movement mechanism which moves the storage disk to an eject portion in response to an operation of the eject member and which moves the storage disk to a read/write position. A lock part, which has a lock member cooperating with the movement mechanism, keeps, in response to the operation of the eject member, the head part stationary at the eject position by the lock member which engages with one of the head part and the linear actuator.

Abstract: An objective lens drive apparatus applicable to an optical disk apparatus includes a base member disposed so as to oppose a recording surface of an optical disk and so as to be movable in a direction of a radius of the optical disk, a support mechanism supporting an objective lens on the base member and so as to be movable in the direction of the direction of the radius of the optical disk. The objective lens drive apparatus also includes a drive mechanism acting upon the support mechanism to move the objective lens on the base member, a displacement detector detecting a displacement of the objective lens on the base member, a controller controlling the drive mechanism so that the objective lens is maintained at a required position on the base member.

Abstract: A magneto-optical disk storage has an erroneous insertion preventing mechanism which projects into a holder so that it can touch the magneto-optical disk cartridge in order to prevent the same from being inserted. The erroneous insertion preventing mechanism mechanically engages with the magneto-optical disk cartridge and moves in a direction approximately vertical to the recording suface of the magneto-optical disk to allow the magneto-optical disk cartridge to be inserted only if the magneto-optical disk cartridge is being inserted into the holder with a correct orientation.

Abstract: An objective lens drive apparatus includes an objective lens holder supporting an objective lens and provided with drive coils, a base fixing permanent magnets, printed circuit boards fixing the base at a monolithic portion thereof, and a plural number of flexible support members electrically and mechanically connected at their base ends to the printed circuit board, and with their distal ends supporting the objective lens holder so as to be flexibly displaced to a position where the drive coils oppose the permanent magnets, and wherein terminals of the drive coils are electrically connected to the flexible support members which are different with each other, and a drive current is supplied to the drive coils from the printed circuit board to pass through the flexible support members.

Abstract: An optical head apparatus applicable to an optical disc apparatus comprises, a case body having an open surface and a window through which an opto-electronic component can be positioned and housing optical components inside it, a lid being attachable and detachable with respect to the open surface of the case body, and a flexible printed circuit board having a base portion which is adhered to the lid and on which electronic components are mounted and a protruding portion protruding from the base portion and having an opto-electronic component fixed to the distal end portion of it, the opto-electronic component being electrically connected with an electronic circuit which is formed by the electronic components, the distal end portion of the protruding portion of the flexible printed circuit board being fixed to the case body so that the opto-electronic component is position to the window.

Abstract: A recording head of a magneto-optical disk apparatus for recording and/or erasing an information signal on and from a magneto-optical disk mounted on the apparatus comprises optical pickup device disposed at a first side of the magneto-optical disk for producing an optical beam such that the optical beam is focused on the first side of the magneto-optical disk, pickup feeding mechanism provided on a frame of the magneto-optical disk apparatus for moving the optical pickup device along a path extending in a radial direction of the disk, a stepping motor disposed at a second side of the magneto-optical disk, the stepping motor having a housing containing a rotor magnet and a stator winding surrounding the rotor magnet, the rotor magnet including a plurality of elongated magnetic parts magnetized to either one of the N-pole and S-pole and arranged with alternate polarity about a rotary axis of the stepping motor such that each of the elongated magnetic parts extends parallel to the rotary axis, the rotor magnet

Abstract: A head carriage mechanism of a magnetic recording/reproducing apparatus including a single guide rod fixed on a frame of the apparatus, a head carriage having a first side in which the guide rod is passed through, a rack of teeth provided on the head carriage at a second side opposing the first side side, a mounting member fixed on the frame, a stepping motor provided with a pinion gear and mounted on the mounting member such that the pinion gear is meshed with the rack teeth, a leaf spring configured to have a U-shaped cross section and mounted on the mounting member such that the leaf spring makes a slide engagement with a part of the head carriage so that the rack teeth and the pinion gear are pressed to each other, and a wear resistant slide member provided at the part of the head carriage in which the leaf spring makes the slide engagement with the head carriage.

Abstract: A head loading mechanism for a flexible disc drive unit, for bringing and withdrawing a magnetic read/write head in contact with and from a flexible magnetic disc comprises a disc loading member rotatably supported in the disc drive unit, for positioning the magnetic disc at a fixed position wherein the magnetic disc is rotatably held; head loading member rotatably supported in the disc drive unit, for carrying the magnetic head; a head load bail member rotatably supported in the disc drive unit, for positioning the magnetic head over the magnetic disc with a gap (g.sub.1) in a state where the bail member makes contact with the hed loading member; and an adjusting mechanism for adjusting a rotational position of the bail member with respect to the head loading member so that the gap (g.sub.1) is varied.

Abstract: A magnetic disc cartridge loading and unloading mechanism comprises a shutter opening mechanism which applies no pushing force on a magnetic disc cartridge in a cartridge ejecting direction when the shutter opening mechanism is in an operating state where a shutter of the magnetic disc cartridge is opened. The magnetic disc cartridge loading and unloading mechanism is also provided with a pushing mechanism which pushes the magnetic disc cartridge slightly in the cartridge ejecting direction after sufficient gaps are formed between the shutter and magnetic heads when a holder which holds the magnetic disc cartridge rises to a predetermined height position during a cartridge unloading operation.