Abstract: From the start of descending of a disk-shaped recording medium in a direction of approaching an objective lens in the optical axis direction by a loading mechanism until it is set at a specified position with respect to a spindle motor, a DC current is supplied to an optical axis direction driving coil through an evading current feeding circuit in a direction for a movable part to depart from the disk-shaped recording medium, and the movable part is located at the remotest position from the disk-shaped recording medium due to an electromagnetic force generated by the DC current flowing in the optical axis direction driving coil and a permanent magnet, so that the disk-shaped recording medium and the objective lens will not collide against each other even if an objective lens with a short working distance is used.

Abstract: A semiconductor device including a polycrystalline silicone resistor which has a resistance of 40 k.OMEGA.-800 k.OMEGA. and which is formed by a polycrystalline silicon film having a specific resistivity of 0.01 .OMEGA..cm-0.1 .OMEGA..cm. The resistor having the above resistance, which has previously been difficult to fabricate, can be fabricated with a high accuracy, so it is very useful for several kinds of semiconductor integrated circuits such as bipolar memory.

Abstract: A magneto-optical disk unit has a first magnetic-field generator for generating a magnetic field corresponding to a frequency in a recording signal frequency band and a second magnetic-field generator for generating DC magnetic fields of both north-seeking and south-seeking poles in a non-contact manner with a loaded magneto-optical disk. The first magnetic-field generator has a slider part for sliding over a loaded magneto-optical disk in a floating manner using an aerodynamic effect. The unit further has a transfer driver for moving the first and second magnetic-field generators in a direction parallel to the loaded magneto-optical disk and a rotary plate for vertically moving the first magnetic-field generator.

Abstract: Guide parts and driving parts are independently provided for an optical head and a magnetic bias field generator, and a relative position control part controls the relative positions of the two so that the both can access recording medium tracks individually. Furthermore, a magnetic pattern track for use as the detection signal of the absolute position of the magnetic bias field generator to the magneto-optical recording medium is formed on the magneto-optical recording medium itself, and a positioning control part of the magnetic bias field generator using this magnetic pattern track is provided, so that the positioning control of the absolute position of the magnetic bias field generator with respect to the magneto-optical recording medium may be realized.

Abstract: The disclosure includes feeding a current I.sub.R to only BIT lines selected, or feeding current I.sub.R transiently to only the BIT lines switched from unselected to selected states; and a sense amplifier for detecting the difference between the currents flowing in selected BIT lines to read out stored information, wherein current I.sub.R and cell current I.sub.cell have a relation of I.sub.R >I.sub.cell. The BiC MOS memory has high speed, low power and high integration density. Diodes are provided between the memory cell and the BIT lines.

Abstract: A magneto-optical data recording and reproducing device for storing data in a data memory medium which applies modulation to a plane of polarization, erasing data therefrom and reproducing data stored therein, comprises a light source for emitting a light beam with linear polarization, a light spot forming means for condensing the light beam emitted from the light source and forming a light spot on the data memory medium, a beam splitting means, located between the light source and the light spot forming means, to which reflected light beams from the data memory medium are applied and splitted, a beam detecting prism, to which light beams splitted by the beam splitting means are applied, providing the polarizing function that a predetermined first pencil of light beam with linear polarization is reflected while a second pencil of light beam with linear polarization crossing the first pencil at right angles is transmitted, a beam splitting prism, being located near or adhered to the beam detecting prism, for s

Abstract: An optical head equipped with a tracking error detector to obtain a tracking error signal for tracking servo. The detector includes a photodetector having a light-detecting region on which a light spot with a predetermined diameter is formed by a reflected light beam from a recording medium. The region is divided by a first division line into two which are further divided by second and third division lines so as to form first to fourth subregions, the first and second subregions being adjacent to each other with the first division line being interposed therebetween, the third subregion being adjacent to the first subregion, and the fourth subregion being adjacent to the second subregion. The separation between the second and third division lines is determined so that the sum of the light receiving quantities of the first and fourth subregions is substantially equal to the sum of the light receiving quantities of the second and third subregions when the objective lens is shifted from its neutral position.

Abstract: An optical recording and reproducing apparatus includes a movable portion carrying a movable optical system, a sliding member slidable on a guide shaft, and a rotation limiting device engaged with an auxiliary guide shaft so as to limit the rotation of the sliding member. In order to reduce the friction of the sliding member, the center of gravity of the movable portion is disposed in the vicinity of the axis of the guide shaft. Further, the construction is such that a thrust moment produced by a drive device and acting around the center of gravity of the movable portion is reduced to substantially zero.

Abstract: In an optical reading-writing apparatus, moving unit (14) has only a mirror (21) for reflecting a horizontal laser beam in vertical direction, an objective lens (22) for converting the laser beam on a recording face of an optical disc (11) and an objective lens driving device (23), and the moving unit (14) is slidably driven in radial direction by a moving unit driving device (24) and the other optical elements such as a semiconductor laser (15), a collimator lens (16), a mirror (17), a beam splitter (18), a photo-sensor (19) and a signal detecting device (20) are fixed on a base member (13).

Abstract: An optical head and supporting apparatus has an optical head for irradiating a parallel beam in a direction perpendicular to a recording surface of an optical disk, an objective lens rigidly mounted on the optical head for receiving the parallel beam from the optical head, tracking drive coils for driving the optical head over the whole recording range in a first direction transverse to the recording tracks of the optical disk, focusing drive coils for driving the optical head in a second direction perpendicular to the recording surface of the optical disk, and a support mechanism made of wire-shaped elastic bodies for supporting the optical head freely movably in the first and second directions over the whole recording range in the first direction of the optical head. The support mechanism is fixedly mounted through elastic bodies on a part of a structural body independent of movement of the optical head.

Abstract: A magneto-optical recording and/or reproducing apparatus includes an optical head for providing a light spot for recording, reproducing and erasing of a magneto-optical disc, a magnetic head which is disposed at a position opposing the optical head with the magneto-optical disc therebetween and which provides a magnetic field for recording and erasing while maintaining a substantially constant distance from the magneto-optical disc by effecting a lift obtained by an air flow generated by the rotation of the disc, a loadbeam which has the magnetic head on its one end and serves to provide a force caused by elastic deformation to the magnetic head to thereby be balanced with the lift thus obtained, and a moving mechanism connected to the loadbeam. Approaching or evading the magnetic head to or from the magneto-optical disc can be realized by deforming the moving mechanism.

Abstract: A vertical bipolar transistor arrangement in which the distance between the emitter and the isolation region is kept within a range determined by the sum of emitter depth and base width (i.e., the thickness of the base in the depth direction). This keeps the carriers given by the emitter from getting trapped inside, thereby preventing the cut-off frequency from dropping.

Abstract: In an opto-magnetic disk type writing/reading apparatus having a magnetic head held by a suspension load beam in an air-borne floating state over a surface of the opto-magnetic disk, the suspension load beam is raised up or put down in a manner that firstly the opto-magnetic disk is revolved at a higher revolution speed than the predetermined rated revolution speed for a predetermined short period, and thereafter the revolution speed is lowered to the predetermined revolution speed after soft-landing putting down of the magnetic head to achieve a steady-state air-borne floating position.

Abstract: A method of manufacturing a bipolar transistor semiconductor device wherein the active regions of a transistor are formed in an opening provided in an insulating film, electrodes are led out by a polycrystalline silicon film formed on the insulating film, and the upper surfaces of the emitter and base electrodes and the exposed surface of the insulating film are substantially even.

Abstract: An objective lens actuator is provided which is equipped with an actuating mechanism for actuating an objective lens mounted on a lens holder of an apparatus adapted to write or read information into or from a recording medium. The actuator moves the lens and its holder in two directions, one direction being substantially parallel to a surface of the recording medium such that the objective lens makes turning motion about a pivot axis oriented substantially normal to the surface of the recording medium and the other direction being vertical, with the lens and holder sliding vertically relative to the pivot axis. The actuator is equipped with at least one parallel driving coil for driving the movable section in the parallel direction and with at least one parallel driving magnetic circuit for imparting a magnetic flux to the parallel driving magnetic circuit.

Abstract: Disclosed is a process for making a bipolar transistor which comprises an n-type Si semiconductor body having a convex portion, an insulation film covering the surface of the semiconductor body other than the convex portion, and a p-type polycrystalline Si layer formed on the insulation film. A p-type region formed in the convex portion serves as an intrinsic base region, the polycrystalline Si layer serves as an extrinic base region, an n-type region formed in the intrinsic base region serves as an emitter region, and the body serves as a collector region.

Abstract: A radiation-hardened semiconductor device including a bipolar transistor is disclosed in which a highly-doped layer equal in conductivity type to and larger in impurity concentration than the base region of the transistor is formed in that portion of the surface of the base region which exists beneath an insulating film, to prevent minority carriers injected into the base region, from reaching the above-mentioned surface portion. Thus, the injected minority carriers can reach a collector region without being extinguished by the recombination at the surface of the base region.

Abstract: Polycrystalline silicon which is provided within a trench for isolating a plurality of bipolar transistors from each other is electrically connected to the collector of one of the bipolar transistor. Since the trench for isolation can also be used to lead out the collector electrode, the required area is minimized. Thus, the arrangement is effective in creasing the integration density.

Abstract: A bipolar memory of a construction having high immunity to soft error attributable to alpha rays is provided. The transistors of a flip flop, i.e., the essential circuitry of the memory cell, are inverted and the load device thereof has shielding means for shielding the flip flop from the noise produced within the substrate. Bipolar transistors and Schottky barrier diodes are employed as the load devices. A buried layer (ordinarily, an n type layer) and a doped layer of the reverse conductivity type (ordinarily the p type) are formed in a region where the device is provided, and a reverse bias is applied across the buried layer and the doped layer to shut off the noise produced within the substrate.

Abstract: A bipolar memory of a construction having high immunity from soft error attributable to alpha rays is provided. The transistors of a flip flop, i.e., the essential circuit of the memory cell, are inverted, and the load device thereof has a shielding arrangement for shielding the flip flop from the noise produced within the substrate. Either pnp type transistors or Schottky barrier diodes are employed as the load devices. A buried layer (ordinarily, an n type layer) and a doped layer of the reverse conductivity type (ordinarily the p type) are formed in the region where the device is provided. A reverse bias is applied across the buried layer and the doped layer to shut off the noise produced within the substrate.